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What technical specifications and implementation requirements must be followed during the installation and lifting of asphalt mixing plants?

As a professional enterprise specializing in the integration and service of core equipment for road engineering, Asian Construction Equipment Group Co., Ltd. (abbreviated as​ ACE Group) has been deeply involved in the full lifecycle service of asphalt mixing plants for many years.  We understand that the installation and lifting process is a crucial prerequisite for ensuring optimal equipment performance and extending its service life. Asphalt mixing plants have complex structures and numerous heavy components; the quality of their installation and lifting directly determines subsequent production efficiency, product quality, and operational safety. Based on this, and drawing upon ACE Group’s extensive project experience, this guide has been compiled to systematically explain the core processes, technical points, and management requirements for the installation and lifting of asphalt mixing plants, providing professional reference for industry colleagues and project implementation.

I. Preliminary preparations: Laying a solid foundation for construction.

(一) Site survey and foundation acceptance

Before commencing installation and lifting operations, a comprehensive and detailed site survey must be conducted.  Key survey aspects include: site topography and ground leveling, geological bearing capacity testing (which must meet the equipment foundation design load requirements, generally not less than 200 kPa), surrounding environment (such as safety distances to nearby buildings, high-voltage lines, and major roads), and a detailed survey of underground utilities (water supply and drainage, gas, and communication cables). The survey results must be compiled into a dedicated report, which will serve as the basis for optimizing the equipment layout and lifting plan, ensuring that the site’s spatial dimensions, bearing capacity, and access conditions meet the operational requirements of the mixing plant main structure, auxiliary equipment, and lifting equipment.

Simultaneously, the concrete mixing plant foundation was strictly inspected according to the design drawings and the “Code for Acceptance of Construction Quality of Concrete Structures” (GB 50204-2015).  Key aspects checked included: foundation geometric dimension deviations (allowable deviation ±5mm), top surface elevation (allowable deviation ±3mm), surface flatness (allowable deviation 2mm/m), and concrete strength (required to reach 100% of the design strength). The foundation surface must be free of structural defects such as cracks, honeycomb, pitting, and exposed reinforcement. The positional deviation of the anchor bolt pre-reserved holes must be controlled within ±2mm. Only after the inspection is passed and the acceptance documents are signed can the subsequent installation process begin, providing a solid foundation for stable equipment installation.

(二) Review of construction drawings and technical briefing

Led by the technical lead, the construction team, supervision unit, equipment suppliers, and relevant personnel from the client side will conduct a review of the construction drawings.  The core focus of the review will be on: the rationality of the overall layout of the mixing plant, the accuracy of the installation coordinates of each component, the feasibility of the connection node structures, the safety of the lifting process, and compatibility with surrounding facilities.  Any design conflicts, dimensional deviations, or technical ambiguities in the drawings will be identified and resolved promptly. For critical aspects such as the lifting path of large modular components and high-altitude docking accuracy, the drawing plans will be optimized based on the results of on-site surveys.

After the drawings are reviewed and approved, the technical supervisor conducts a specialized technical briefing for the construction team, clarifying the technical parameters, quality control standards, safety operating procedures, progress milestones, and emergency response measures for each construction stage.  The briefing content is detailed down to critical details such as the lifting angles of specific components, tightening torque, and precision tolerance ranges.  This is done through a combination of written briefing records and on-site practical demonstrations to ensure that every construction worker clearly understands the work requirements, laying a solid foundation for the smooth progress of the construction project.

(三) Preparation of construction equipment and tools

Based on the production capacity of the asphalt mixing plant (e.g., 2000 type, 4000 type), the weight of core components (e.g., the weight of the mixing unit can reach 50-150 tons), and the installation process requirements, construction equipment and tools are precisely configured.  Lifting equipment selection must meet a safety factor of 1.2 times the maximum lifting weight. Commonly used equipment includes: truck cranes (50-200 tons), crawler cranes (for ultra-heavy components or complex sites), flatbed trailers (for component transportation), and forklifts (for handling small components). All lifting equipment must be certified by a third party, be within its validity period, and be equipped with safety devices such as torque limiters and height limiters.

At the same time, prepare specialized installation tools and consumables, including: high-precision torque wrenches (torque accuracy ±3%), spirit levels (accuracy 0.5 mm/km), theodolites (angular accuracy 2″), jacks, winches, specialized lifting equipment (steel wire ropes, shackles, balance beams), and sealing materials (high-temperature resistant sealant, rubber gaskets), etc. All tools must be pre-calibrated, and consumables must meet the design material requirements to ensure the continuity and reliability of the construction process.

II、Core Lifting and Installation Process: Precise and Efficient Positioning

(一) Lifting and installation sequence planning

Following the core principles of “prioritizing main components over secondary ones, larger components over smaller ones, lower components over upper ones, and internal components over external ones,” the lifting sequence is scientifically planned to avoid interference from overlapping operations and the risk of rework. The specific sequence is as follows:

1. Mixing plant base (the core load-bearing foundation, prioritized for precise positioning);

2. Aggregate batching system (hoppers, supports, and other large components);

3. Powder supply system (powder tanks, screw conveyor main body);

4. Asphalt supply system (asphalt tanks, heating devices);

5. Mixing plant main body and cover;

6. Dust removal system (large dust collector main body);

7. Control room, electrical cabinets, and other small, high-precision components;

8. Various conveying pipelines, connectors, and accessories.

(二) Specialized Lifting Methods and Key Technical Points

1. Lifting of heavy components (mixer base, main body, large powder silos):  The preferred method is dual-crane lifting or single-crane multi-point balanced lifting. For dual-crane lifting, cranes of the same model and performance should be selected, and a synchronous control system must be used to ensure synchronized lifting and movement. Lifting points should be symmetrically arranged, and the load distribution should be even (each crane’s load should not exceed 80% of its rated capacity). For single-crane multi-point lifting, the lifting point positions should be determined through finite element analysis, and a balance beam should be used to distribute the load and prevent local deformation of the component.During the lifting process, guide ropes were used to control the component’s position and prevent collisions. The lifting speed was controlled to within 0.5 m/min, and a 10-20 cm adjustment space was reserved during positioning, allowing for precise alignment using a traction device.

2. Lifting of long structural components (aggregate belt conveyors, long-distance screw conveyors):  Depending on the length and rigidity of the components, either integral or segmented lifting methods are selected. Integral lifting requires precise calculation of the center of gravity and the installation of temporary reinforcement supports (such as I-beam reinforcement) to prevent bending deformation during lifting; segmented lifting requires pre-assembly and trial fitting on the ground, marking precise alignment lines, and then lifting each segment into place sequentially. Flange or welded connections are used during segmented connection to ensure that the coaxiality deviation is controlled within 0.5 mm/m.

3. Lifting of small, precision components (sensors, electrical components, instruments):  A lifting method involving manual assistance and small lifting equipment (electric hoists, winches) should be used. Flexible slings should be used as lifting gear to avoid damaging the component surfaces.  Personnel must wear anti-static gloves, and direct dragging of components is strictly prohibited. Components should be secured immediately after positioning to prevent falling or collision damage.

III. Meticulous Installation Process: Ensuring Optimal Performance

(一) Installation of the mixing unit

1. After the base is in place, use shims to adjust the levelness.  Both longitudinal and transverse levelness deviations should be controlled within 0.2 mm/m. When tightening the anchor bolts, use a diagonal and even tightening method, ensuring the torque value meets the design requirements (generally 800-1000 N·m for M30 bolts). After tightening, recheck the levelness.

2. After the main unit is hoisted into place, it should be precisely aligned with the base, adjusting the coaxiality deviation to ≤0.3mm, and then the connecting bolts should be tightened. When installing the transmission device and reducer, ensure that the coaxiality deviation of the motor, reducer, and main unit input shaft is ≤0.2mm, and the coupling gap is controlled between 2-4mm.  Add the specified type of lubricating oil (generally industrial gear oil GL-5) according to the equipment manual, filling it to the oil level mark.  There should be no abnormal vibration or noise during trial operation.

3. The mixing blades must be installed strictly according to the angle markings (the typical design angle is 30°-45°), and the gap between the blades and the liner should be controlled at 5-10mm to ensure uniform mixing; when installing the discharge gate, adjust the flatness of the sealing surface to ≤0.5mm, install high-temperature resistant sealing strips, and conduct a leakage test during trial operation to ensure there is no leakage of asphalt or aggregate.

(二) Installation of the aggregate batching system

1. During the installation of the aggregate bins, ensure that the verticality deviation of the bin body is ≤1 mm/m, the bin partitions are tightly sealed, and there are no gaps between adjacent bins to prevent aggregate mixing; the inclination angle of the bin body should be determined according to the type of aggregate (generally 60°-65° for crushed stone and 65°-70° for sand) to ensure smooth and unobstructed flow of aggregates without any retention.

2. During the installation of the belt conveyor, the longitudinal horizontal deviation of the frame shall be ≤1mm/m, and the transverse vertical deviation shall be ≤2mm/m. The tension of the conveyor belt is controlled by adjusting the position of the rollers. During no-load test operation, the belt deviation shall be ≤5mm/10m; the weighing device must be installed to ensure that the weighing hopper is level, the sensors are subjected to uniform force, and the wiring connections are secure. After calibration, the weighing error shall be controlled within ±0.5%, meeting the requirements of “Weighing Display Controller” (GB/T 7724-2017).

3. The aggregate hopper and discharge gate must be installed with a secure and sealed connection. The discharge gate should open and close smoothly, the electric actuator’s response time should be ≤0.5s, and the limit switches must be accurately positioned to prevent over-opening or over-closing.

(三) Installation of the powder supply system

1. When installing the powder storage tank, the foundation must be leveled and compacted. A level instrument should be used to calibrate the verticality of the tank body, with a deviation of ≤1mm/m. The tank body should be secured using a combination of anchor bolts and wind-resistant guy wires (the strength of the guy wires needs to be reinforced in areas with wind speeds ≥6 on the Beaufort scale). The tank body must be equipped with a dedicated grounding device, with a grounding resistance of ≤4Ω, to prevent the risk of dust explosion caused by static electricity accumulation.

2.  During the installation of the screw conveyor, ensure that the longitudinal levelness deviation of the casing is ≤0.5 mm/m, and that the gap between the screw blades and the casing is uniform (2-3 mm) to prevent material jamming.  A high-precision tension sensor should be used for the weighing device, and the weighing error should be controlled within ±0.3%. After installation, perform three full-scale load calibrations to ensure accurate measurement.

3. The conveying pipelines are connected using flanges, with wear-resistant rubber gaskets used for sealing. The bolts are tightened evenly in a diagonal pattern. The pipeline layout is designed to minimize the path length and reduce the number of elbows (elbow radius of curvature ≥ 3 times the pipe diameter) to lower the resistance to powder conveying; pneumatic ball valves are used, with a switching accuracy of ≤ 0.1s, ensuring precise control of the powder conveying volume.

(四) Installation of the asphalt supply system

1. The asphalt tank installation must ensure a tank body levelness deviation of ≤1 mm/m. The foundation should be equipped with a moisture-proof layer and an insulation layer. The outside of the tank body should be wrapped with rock wool insulation material with a thickness of ≥50 mm. The internal heating device (heat transfer oil heating pipes) must be securely installed and evenly distributed. Temperature sensors should be installed in the middle and bottom of the tank, with a measurement accuracy of ±1℃, to ensure that the asphalt temperature is stably controlled within the production range of 130-160℃.

2. The asphalt conveying pipelines are made of stainless steel (304 or 316L), with a heating device and insulation layer on the outside.  The connections use a double sealing method of welding and flanges, and the welded joints undergo penetrant testing (PT) to ensure there are no defects such as pores or cracks. The pumping system uses a dedicated asphalt gear pump, with flow rate and head matching the asphalt plant’s capacity. During trial operation, the pump body shows no leakage, and the pressure remains stable (fluctuation range ≤ 0.2 MPa).

3. The asphalt spray nozzle is installed directly opposite the aggregate discharge point of the mixing plant, and the nozzle angle is adjusted to 45°-60° to ensure even spraying of asphalt onto the aggregate surface.  An electromagnetic flow meter is used for metering, with a metering error controlled within ±0.5%, and it is linked to the control system to achieve precise closed-loop control of asphalt usage.

IV. Key Points for Quality Control Throughout the Entire Process

(一) Quality inspection of incoming components

All incoming components must be accompanied by factory certificates of conformity, material certificates, and performance test reports. ACE Group, in conjunction with the supervising unit, will conduct special inspections:

1. Visual inspection: verifying that components are free from defects such as deformation, corrosion, and cracks, and that the surface coating is intact;

2. Dimensional inspection: ensuring that critical dimensions (such as connection flange thickness and bolt hole spacing) are within a tolerance of ±2mm.

3. Performance Testing: The mixing drum body undergoes ultrasonic testing (UT), with a 100% weld qualification rate; the gearbox undergoes no-load test run, operating smoothly and quietly with a temperature rise of ≤40℃; the sensors are calibrated for accuracy, and the error meets design requirements.  

Any parts that fail inspection are strictly prohibited from being used on site and must be returned to the supplier for replacement.

(二) Dynamic Control of Installation Accuracy

During the installation process, a closed-loop control model of “real-time monitoring – adjustment – verification” was adopted, with key precision indicators tracked throughout:

1. Foundation elevation and levelness: Verified after each process step; deviations exceeding limits were corrected using shims or secondary grouting;

2. Component verticality and coaxiality: Monitored in real time using a theodolite and laser alignment instrument, and re-verified after adjustment;

3. Connection gap and sealing accuracy: Checked using feeler gauges, with a sealing surface gap of ≤0.1mm to ensure no leakage.

All precision data must be recorded and archived to form quality traceability documents.

(三) Quality control of connecting parts

Bolt connections must be tightened strictly according to the design torque, using a torque wrench in three stages (initial tightening, re-tightening, and final tightening).  Thread locking compound must be applied to bolts in critical areas (main machine base, tank fixing bolts) to prevent loosening; welded connections must be performed by certified welders, with beveling treatment before welding and slag removal after welding, followed by non-destructive testing (UT/PT) to ensure weld quality; sealed connections require the selection of sealing materials compatible with the medium, even application of sealant during installation, and pressure testing after tightening (asphalt pipelines are tested at 1.5 times the working pressure, with no leakage for 30 minutes).

V. Comprehensive Security Management Measures

(一) Personnel Safety Management

Before construction began, ACE Group organized specialized safety training for all personnel.  The training covered topics such as lifting and hoisting safety procedures, working at height regulations, electrical safety procedures, fire and explosion prevention requirements, and emergency response procedures.  A test was administered after the training, and only those who passed were allowed to work.  Workers were required to wear appropriate personal protective equipment (safety helmets, safety harnesses, non-slip shoes, and protective gloves).  Personnel working at height were required to obtain a work-at-height permit, and safety harnesses were to be secured using the “high-point attachment, low-point use” method.  Working without a permit or engaging in unsafe practices was strictly prohibited.

(二) Safety precautions at the construction site

The construction site is enclosed with a fence, dividing it into work areas, office areas, and material storage areas. Safety warning signs are displayed (including warnings for lifting operations, working at heights, and fire hazards).  Working platforms at height are equipped with guardrails (height ≥ 1.2m) and safety nets, and safety protection sheds are installed below the working areas.  Unauthorized personnel are strictly prohibited from entering the work areas. The construction site is equipped with sufficient fire-fighting equipment (dry powder fire extinguishers, fire sand, fire hoses) and first-aid supplies, and emergency exits are provided to ensure smooth emergency response.

(三) Equipment Safety Management

Before using lifting equipment, a comprehensive inspection is required: the wire ropes must be free of broken strands and excessive wear (wear less than or equal to 3%), the brakes must be sensitive and reliable, and the limit switches must be effective; electrical equipment must be protected against rain, moisture, and electrical leakage, the distribution box must be equipped with a leakage protection device (leakage action current ≤ 30mA), and the wires must be protected by conduits; a dedicated person must monitor the equipment during operation, and if any abnormality is found, the equipment must be stopped immediately for inspection; regular maintenance and servicing should be performed, and worn parts should be replaced to ensure the safe and reliable operation of the equipment.

(四) Safety Management and Control for Specialized Operations

High-altitude work must avoid overlapping operations; if overlapping is unavoidable, isolation and protective layers must be installed. Lifting operations require a dedicated person to direct the work, and the command signals must be standardized (using both hand gestures and walkie-talkies). Open-air lifting operations are strictly prohibited in winds of force 6 or higher, or during rain or snow. Electrical work requires power to be switched off, and a “Do Not Energize” sign must be displayed.  Before starting work, a voltage test must be performed to ensure that there is no electricity before proceeding. During asphalt system installation, open flames are strictly prohibited near the work area, and a combustible gas detection device must be installed at the construction site to prevent asphalt leaks from causing fires.

VI. Description of Usage Scenarios

This guide is applicable to the installation and lifting operations of new construction, expansion, and renovation projects for various types of asphalt mixing plants (fixed, mobile, batch, and continuous) manufactured by ACE Group and other companies in the industry.  It covers the construction scenarios of asphalt mixing plants supporting various road engineering projects, including municipal roads, highways, airport runways, and port terminals. It can serve as a core basis for construction units to prepare construction plans, for technical personnel to provide technical guidance, and for operators to perform operations. It can also be used by project owners as a reference for supervising and managing project quality and safety.

VII. Frequently Asked Questions and Answers for Customers

Q1: How long does it typically take to install and assemble asphalt mixing plants of different capacities?

A1: The installation and hoisting period mainly depends on the production capacity of the concrete mixing plant and the on-site construction conditions.  The typical project timelines for ACE Group are as follows: for small mixing plants (2000 type and below), the period is approximately 15-20 days; for medium-sized mixing plants (3000-4000 type), the period is approximately 25-35 days; for large mixing plants (5000 type and above), the period is approximately 40-60 days. If the site is restricted, requires night work, or encounters adverse weather conditions, the period may be extended accordingly. We will develop a precise schedule based on the actual site conditions during the early stages of the project to ensure timely completion.

Q2: During the installation process, how can we ensure the installation accuracy of the concrete mixing plant to avoid problems such as excessive vibration and high noise during subsequent operation?

A2: ACE Group controls installation accuracy through a “three-tiered guarantee”: first, it uses high-precision measuring equipment (laser alignment instruments, electronic levels) for real-time monitoring to ensure that key indicators remain within the design specifications; second, it implements a “process handover inspection” system, where each accuracy-related process must be reviewed and approved by the technical supervisor before proceeding to the next step;third, after the equipment is installed, conduct no-load and load test runs.  Use vibration sensors and noise detectors to monitor the equipment’s operating status. If abnormal vibration or noise occurs, troubleshoot and adjust the equipment promptly (such as adjusting the main unit’s levelness and optimizing the coaxiality of the transmission system) to ensure stable operation.

Q3: How should we deal with the risk of deformation of large components (such as the mixing unit) during the lifting process?

A3: We will take comprehensive preventive measures before lifting: firstly, we will determine the optimal lifting points through finite element analysis and use a special balancing beam to distribute the load and avoid local stress concentration; secondly, we will adopt temporary reinforcement measures for heavy components (such as welding reinforcing bars) to improve the rigidity of the components; and thirdly, we will select lifting equipment with matching performance, control the lifting speed and posture, and avoid impact loads. If any signs of deformation are detected during the lifting process, we will immediately stop lifting and address the issue by adjusting the lifting points, adding reinforcement measures, or changing the lifting plan to ensure the safety of the components before continuing the operation.

Q4: What after-sales support services will your company provide after the installation is complete?

A4: ACE Group provides comprehensive after-sales support services:

1. After installation, a professional team will conduct equipment commissioning (including no-load and load testing) to ensure that all equipment performance meets the standards; 2. We provide specialized training for the owner’s operators, covering equipment operation, daily maintenance, and troubleshooting;

3. We provide a one-year free warranty service, with dedicated personnel conducting regular inspections during the warranty period to promptly resolve any equipment operating issues;

4. We establish a long-term service mechanism, providing lifelong technical support and spare parts supply services to ensure the long-term stable operation of the equipment.

Q5: The construction site is located near a residential area. How can we control construction noise and dust pollution?

A5: For construction sites near residential areas, we will implement specific environmental protection measures:

1. Noise control: We will use low-noise construction equipment, set up noise barriers, and schedule work times appropriately (avoiding 10:00 PM to 6:00 AM and lunch breaks).  We will also minimize horn use during lifting operations to reduce noise impact;

2. Dust control: The construction site ground will be hardened, material transport vehicles will be covered with tarpaulins, and mist cannons and sprinkler systems will be used to suppress dust.  Enclosed measures will be taken during the handling of powdery materials to prevent dust dispersion and ensure compliance with local environmental emission standards.

VIII. Conclusion

The installation and lifting of asphalt mixing plants is a technically intensive and complex engineering project, and its quality and safety directly determine the equipment’s operational efficiency and the overall project benefits.Drawing on years of industry experience, Asian Construction Equipment Group Co., Ltd. has built an integrated implementation system encompassing “precise planning in the early stages, refined process control, and comprehensive service support throughout the entire lifecycle.” By strictly adhering to the technical specifications and management requirements outlined in this guide, we can effectively guarantee the safety, standardization, and efficiency of installation and lifting operations. In the future, Asian Construction Equipment Group Co., Ltd. will continue to focus on technological innovation, constantly optimizing installation and lifting processes to provide customers with more professional and reliable asphalt mixing plant integration services, contributing to the high-quality development of road engineering.

Note: The content of this guide is based on the practical experience of Asian Construction Equipment Group Co., Ltd. projects and current national and industry standards. It is intended for reference only by relevant organizations when carrying out asphalt mixing plant installation and lifting work. Specific implementation requires targeted adjustments based on actual project conditions, equipment technical parameters, and site conditions.

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How do the design features of mobile asphalt mixing plant adapt to the needs of various engineering projects? An analysis of their core advantages.

As a professional manufacturer and service provider in the field of road construction equipment, Asian Construction Equipment Group Co., Ltd. (abbreviated as​ ACE Group) is deeply committed to the research, development, production, and technical service of mobile asphalt mixing plants, focusing on the core needs of efficient, environmentally friendly, and convenient engineering construction.  With its core characteristics of flexible relocation and rapid commissioning, the mobile asphalt mixing plant has become essential equipment for road maintenance, construction in remote areas, and continuous operation across multiple project sections.This article systematically analyzes the structural composition, working principles, core technical characteristics, and engineering application advantages of mobile asphalt mixing plants from the perspective of Asian Construction Equipment Group Co., Ltd. products and technologies. It addresses frequently asked technical questions from industry clients, providing professional technical references and systematic solutions for engineering applications.

I. Core Structural Components

1. Aggregate supply system

The aggregate supply system is a fundamental component that ensures the continuous and stable production of the concrete mixing plant.  ACE Group utilizes a modular integrated design to precisely meet the efficient supply requirements of different aggregate gradations. The core configuration is as follows:

• Aggregate Bins: Equipped with 3-6 independent bins, allowing for the classified storage of different grades of aggregates such as crushed stone and sand. The bin capacity is matched to the production capacity, ranging from 50 to 150 tons. The bins are constructed from wear-resistant steel plates and feature an anti-stick coating on the inner walls, along with a vibration-based arch-breaking device to effectively prevent aggregate arching and blockage, ensuring continuous material flow.

• Aggregate weighing device: Equipped with high-precision weighing sensors and an intelligent metering control system, with a weighing range of 0-8000kg and a metering accuracy of ±1% to ±2%. It integrates a dynamic compensation algorithm to correct metering deviations in real time, ensuring that the aggregate proportion accuracy meets engineering technical specifications.

• Aggregate conveying device: Large units are equipped with heavy-duty belt conveyors (conveying capacity 100-300 t/h), integrated with anti-deviation and anti-spillage mechanisms; small units or those operating in confined spaces utilize shaftless screw conveyors, which feature a compact structure and stable conveying performance, effectively meeting the needs of mobile and relocatable operations.

2. Powder supply system

Addressing the characteristics of powdered materials such as cement, mineral powder, and fly ash, which are prone to arching and dust generation, ACE Group has optimized the design of its powder supply system to ensure both stable conveying and environmental compliance.  The core configuration is as follows:

• Powder Silo:  Features a sealed silo structure with a capacity of 20-80 tons, equipped with a pneumatic arch-breaking device and a material level sensor. The arch-breaking device can automatically start and stop based on the material level feedback signal, ensuring smooth powder discharge; the material level sensor continuously collects data on the remaining material in the silo, providing data support for precise material replenishment.

• Powder weighing device:  Utilizes a suspended weighing hopper equipped with high-precision sensors, with a weighing range of 0-3000kg and a weighing accuracy of ±0.5% to ±1%. The weighing hopper is fitted with a dustproof sealing cover and an automatic cleaning mechanism, effectively reducing powder leakage and residue, ensuring stable weighing accuracy.

• Powder conveying device: The mainstream configuration uses a closed screw conveyor, which offers the advantages of stable conveying and convenient maintenance; for long-distance conveying scenarios, a pneumatic conveying system can be used, which achieves enclosed conveying of powder through compressed air, with a conveying distance of up to 50 meters or more, effectively controlling dust pollution.

3. Asphalt supply system

The core technical aspects of the asphalt supply system are precise temperature control and guaranteed metering accuracy. ACE Group employs a full-process insulation design to ensure stable asphalt performance. The core configuration is as follows:

• Asphalt Tank: With a capacity of 50-120 tons, the tank features a double-layered insulation structure (inner layer heated by thermal oil, outer layer insulated with rock wool), and is equipped with temperature sensors and an automatic heating control system. This ensures precise and stable control of the asphalt temperature at 130-160℃, guaranteeing excellent asphalt fluidity.

• Asphalt transfer pipeline:  Uses seamless steel pipes with an outer layer of heat-transfer oil heating jackets, complemented by an electric tracing auxiliary insulation system. The pipeline temperature is monitored in real time to effectively prevent asphalt solidification and blockage.  Quick-connect couplings are used at pipeline joints for easy disassembly and reassembly during relocation.

• Asphalt metering device: Equipped with an imported high-precision electromagnetic flow meter, achieving a metering accuracy of ±0.5%, and integrating both mass and volume measurement and calibration functions.  It can automatically adjust the asphalt flow rate according to the formula parameters, ensuring precise and controllable asphalt-to-aggregate ratio in the mixture.

4. Mixing unit

The mixing unit is the core component that determines the quality of the mixed materials. ACE Group utilizes a twin-shaft forced mixer design, which can precisely adapt to the mixing requirements of different working conditions. The core configuration is as follows:

• Mixing Tank: Available in capacities of 2000L, 3000L, and 4000L. The tank body is made of high-strength, wear-resistant steel plates, and the inner lining features a quick-release design. The internal design of the mixing tank optimizes material flow to ensure thorough mixing and tumbling of materials.

• Mixing System: Equipped with a high-power motor and a hardened gear reducer, it features high transmission efficiency and strong operational stability. The mixing arms and blades are made of wear-resistant alloy material, and the blade arrangement has been optimized through fluid dynamics simulation.  It utilizes a dual-mode control system of “low-speed mixing + high-speed discharge,” resulting in a 20% increase in mixing efficiency and a discharge time shortened to 15-25 seconds.

• Discharge device:  It adopts a hydraulically driven discharge gate with a double sealing structure, effectively preventing leakage of the mixed material. The opening and closing of the discharge gate are precisely controlled by a PLC system, providing a dual safety mechanism of automatic discharge and manual emergency operation.

5. Intelligent control system

ACE Group’s independently developed intelligent control system achieves fully automated control of the entire concrete mixing plant process, effectively improving production efficiency and operational convenience.  Its core components are as follows:

• Control Panel:  Features an ergonomic design with a high-definition touchscreen and physical control buttons, displaying real-time production parameters, equipment operating status, and other key information. The user interface is simple and intuitive, supporting both Chinese and English languages to meet the needs of different operators.

• Core Control Unit: Utilizes an industrial-grade PLC controller (Siemens or Mitsubishi brands optional), equipped with proprietary control software developed in-house. It features functions such as recipe storage (up to 100 sets), production data statistics, and fault warning and diagnosis.  It supports remote monitoring and maintenance, allowing real-time viewing of production status and remote troubleshooting via a mobile app or computer.

• Sensing and Detection System: Equipped with multiple types of high-precision sensors for temperature, pressure, flow rate, and material level, the system features high detection accuracy and fast response speed. Sensor data is transmitted to the control unit in real time. When parameters exceed the set thresholds, the system immediately triggers an audible and visual alarm and automatically executes safety protection measures such as shutdown and material cutoff.

6. Precise weighing system

The weighing system adopts a hierarchical weighing design architecture, which is a key component in ensuring the accuracy of material proportioning and the quality of the mixed materials.  Its core components are as follows:

• Aggregate scale: Measuring range 0-8000kg, accuracy ±1%~±2%, adopts a dual-sensor support structure to effectively reduce the impact of material shock on weighing accuracy.

• Powder weighing scale: Measuring range 0-3000kg, accuracy ±0.5%~±1%, equipped with a dust cover and automatic cleaning mechanism to prevent powder adhesion from affecting weighing accuracy.

• Asphalt scale/flow meter:  Utilizes a dual measurement and verification mechanism for both mass and volume, ensuring accurate asphalt usage with a measurement accuracy of ±0.5%.

• Finished product weighing scale: Measuring range 0-10000kg, used to verify the weight of each batch of mixed materials, ensuring production batch stability and providing a basis for production data traceability.

7. Environmentally friendly dust removal system

ACE Group adheres to the concept of green manufacturing and has implemented an integrated two-stage dust removal and exhaust gas treatment system, fully meeting national environmental protection standards.  The core components are as follows:

• Primary dust removal: A cyclone dust collector is used to separate large dust particles with a diameter of ≥ 10μm using centrifugal force, achieving a dust removal efficiency of over 90%.  It features a simple structure and convenient maintenance, allowing for quick removal of accumulated dust.

• Secondary dust removal: A pulse jet bag filter (with high-temperature resistant needle-punched felt filter bags) is used to efficiently filter fine dust particles with a diameter of ≥0.5μm, achieving a dust removal efficiency of ≥ 99.5%.  An automatic cleaning system is included to regularly clean the filter bags and ensure stable filtration performance.

• Induced Draft and Exhaust Gas Treatment: Low-noise induced draft fans are used, along with silencing devices, to effectively reduce operating noise. High-end models can be optionally equipped with exhaust gas desulfurization and denitrification devices to further reduce harmful gas emissions and meet stringent environmental control requirements.

8. Finished product storage silo

The finished product silo is used for the temporary storage of asphalt mixture. Its main functions are to ensure production continuity and maintain the temperature stability of the mixture.  The core components are as follows:

• Storage function: With a capacity of 50-150 tons, it features a sealed steel structure design, effectively preventing the mixed materials from getting damp or contaminated.

• Insulation system: The silo body uses a rock wool insulation layer combined with an electric heating system to maintain the mixed material temperature stably at 120-140℃, reducing heat loss and ensuring optimal performance during paving construction.

• Discharge device:  Features a pneumatically controlled discharge gate and a flow regulating mechanism, allowing for precise control of the discharge speed according to the needs of the transport vehicle.  The discharge opening is equipped with a spill-proof baffle to reduce material waste and environmental pollution.

II. Working Principle

1. Material feeding and metering stage

After the loader delivers the aggregate to the aggregate bin, the control system, based on preset formula parameters, instructs the aggregate conveying device to transport the aggregate to the aggregate weighing hopper for precise weighing; the powder is transported to the powder weighing hopper via a screw conveyor or pneumatic conveying device for weighing; and the asphalt is transported through insulated pipes to the metering device for flow/mass measurement.  Once all materials have been weighed, the weighing hopper gates open simultaneously, accurately discharging the materials into the mixing drum of the main mixer.

2. Mixing stage

After the mixing unit is started, the twin-shaft mixing blades rotate forward, performing forced mixing of the materials.  The optimized arrangement of the blades ensures that the materials tumble vertically and mix horizontally within the cylinder, guaranteeing thorough blending of aggregates, powders, and asphalt. The mixing time can be preset to 30-60 seconds depending on the type of mixture, and can be manually fine-tuned via the control system under special operating conditions. If additives are required, they can be precisely sprayed through dedicated pipelines during the mixing process.

3. Unloading and storage phase

After mixing is complete, the mixing drum rotates in the reverse direction, and the hydraulic system drives the discharge gate to open, discharging the uniformly mixed asphalt mixture into the finished product silo or directly into transport vehicles.  After unloading, the mixing drum resumes forward rotation to clean out any remaining material, preparing for the next mixing cycle. The mixture in the finished product silo is kept at the required temperature by a heating system to ensure the needs of subsequent paving operations are met.

4. Environmental treatment stage

During the mixing process, the dust-laden air generated is drawn into the dust removal system by the negative pressure of the induced draft fan.  It first passes through a cyclone separator to remove large dust particles, and then enters a pulse jet bag filter for deep filtration to remove fine dust. The filtered clean air is discharged through the exhaust stack after meeting emission standards. The collected dust can be regularly cleaned and recycled. The small amount of asphalt-containing wastewater generated during the production process is treated by a dedicated wastewater treatment device and can be recycled for equipment cleaning, achieving zero wastewater discharge.

III. Advantages of Core Engineering Applications

1. Flexible transitions, adaptable to multiple work scenarios.

ACE Group’s mobile asphalt mixing plant adopts a fully modular design architecture, with each functional unit integrated onto a trailer chassis or crawler-type walking mechanism.  During relocation, there is no need to disassemble core components; the equipment can be quickly moved by a tractor or by its own self-propelled mechanism.  Assembly and disassembly time is reduced to within 24 hours, significantly lowering relocation and transportation costs. This feature makes it particularly suitable for road construction in remote mountainous areas, continuous operation across multiple project sections, and emergency road repairs, allowing for rapid deployment and operation to ensure project progress stays on schedule.

2. Easy to install, with a short commissioning period.

The equipment is pre-installed and debugged before leaving the factory, requiring only simple procedures such as module connection, pipeline connection, and site leveling for on-site commissioning. Compared to traditional fixed concrete batching plants that require large-scale civil engineering construction, the ACE Group mobile concrete batching plant requires only 3-7 days for on-site installation and commissioning, significantly shortening the project preparation period and helping customers quickly increase production capacity.  Furthermore, it does not require long-term site occupation and can be quickly removed after completion of work, reducing site rental costs.

3. High efficiency and stability, with controllable production quality.

Equipped with an advanced twin-shaft mixing system and intelligent control system, the plant boasts a production capacity of 80-240 tons per hour, meeting the production needs of various-sized projects.  Fully automated control ensures precise coordination of all processes, resulting in minimal aggregate gradation deviations and stable, controllable mix quality.  Furthermore, the equipment utilizes high-quality core components (such as imported sensors and wear-resistant mixing blades), leading to a low failure rate and significantly longer continuous operating time, effectively improving production efficiency.

4. Environmentally friendly and compliant with policy requirements.

Utilizing a comprehensively optimized environmentally friendly design, the two-stage dust removal system effectively controls dust emissions, with dust concentration below 10 mg/m³, meeting the latest national environmental standards.  The fully enclosed material conveying and storage structure reduces dust pollution.  Optional exhaust gas treatment and wastewater recycling systems are available to reduce harmful gas emissions and enable water resource recycling. The equipment operates with noise levels below 85 dB, making it suitable for operation in environmentally sensitive areas such as residential neighborhoods.

5. Intelligent operations and maintenance reduce management costs.

The independently developed intelligent control system supports real-time production data statistics, automatic fault warning, and remote monitoring and maintenance functions. Operators can quickly access recipes and view production reports via the touchscreen, facilitating production management.  When equipment malfunctions, the system can accurately locate the fault and issue a warning, allowing technicians to quickly troubleshoot the problem through remote assistance, thus reducing downtime.  Furthermore, the modular design facilitates component maintenance and replacement, lowering long-term operating and maintenance costs.

IV. Core Application Scenarios

1. Road construction scene in a remote mountainous area

Addressing the challenges of inconvenient transportation, difficult material delivery, and limitations on bringing in traditional equipment in remote mountainous areas, ACE Group’s mobile asphalt mixing plant offers flexible relocation capabilities, allowing for quick deployment without extensive dismantling. The equipment can utilize local aggregate resources for production, significantly reducing the cost of long-distance transportation of mixed materials.  Its rapid deployment capability also ensures timely progress in mountain road construction, making it suitable for the construction and expansion of low-grade roads in mountainous regions.

2. Multi-section continuous operation scenarios

Large linear engineering projects such as highways and national and provincial trunk roads are often divided into multiple construction sections. Traditional fixed asphalt mixing plants have high relocation costs and long transfer times.  ACE Group’s mobile asphalt mixing plant can be quickly moved between different sections, with disassembly and reassembly time reduced to within 24 hours. This eliminates the need for repeated construction of infrastructure, effectively reducing equipment investment and relocation costs for multi-section projects, and ensuring the continuity of construction and consistency of asphalt mix quality across multiple sections.

3. Emergency road repair scenarios

When roads are damaged by natural disasters such as floods and earthquakes, or when potholes and cracks appear in roads requiring emergency repairs, ACE Group’s mobile asphalt mixing plant can respond quickly and be deployed nearby.  It can be installed, commissioned, and put into operation in a short time, providing a stable supply of asphalt mixture for emergency repairs and helping to quickly restore road traffic capacity. This is suitable for scenarios such as emergency repairs of municipal roads and emergency maintenance of national and provincial trunk roads.

4. Road maintenance engineering scenarios

Routine maintenance operations on urban and rural roads are characterized by dispersed work sites, small work volumes per operation, and high mobility.  ACE Group’s mobile asphalt mixing plant is compact and highly portable, allowing it to move with maintenance crews and produce small batches of asphalt mix on-site. This makes it ideal for various maintenance procedures such as road milling and resurfacing, crack filling, and pothole repair, improving maintenance efficiency and reducing costs.

5. Operating scenarios in environmentally sensitive areas

Environmentally sensitive areas such as residential areas, scenic spots, and water source protection zones have strict requirements regarding construction dust and noise emissions.  ACE Group’s mobile asphalt mixing plant is equipped with a two-stage dust removal and exhaust gas treatment system, resulting in dust emission concentrations of ≤ 10mg/m³and operating noise levels below 85dB.  It also utilizes a fully enclosed material conveying structure, effectively controlling dust pollution and making it suitable for construction scenarios with high environmental requirements, such as urban road renovation and scenic road upgrades.

6. Temporary construction site scenarios

Temporary infrastructure projects, such as temporary access roads for large-scale construction projects, temporary roads in industrial parks, and roads for construction camps, are characterized by short construction periods and do not require long-term site occupation.  ACE Group’s mobile asphalt mixing plants can be quickly deployed and put into operation, meeting the demand for asphalt mix during temporary road construction. After completion, they can be quickly removed, avoiding the site remediation issues associated with dismantling traditional fixed equipment and reducing the construction costs of temporary projects.

V. Frequently Asked Questions (FAQ) for Customers

Q1: What preparations are needed when relocating an ACE Group mobile asphalt mixing plant?

A1: The following technical preparations must be completed before the transition:

① Empty any remaining materials from the hoppers and clean dust and debris from the equipment surfaces;

② Disconnect the power supply, air supply, and pipeline connections, and seal and protect the interfaces;

③ Check the fixing status of each modular component to ensure that the connecting bolts are tightened;

④ Check the performance of the chassis, tires, and braking system according to the relocation method (towing/self-propelled);

⑤ Plan the transportation route in advance and verify whether the route’s load capacity and width meet the equipment transportation requirements. Under normal circumstances, a professional team of 2-3 people can complete the relocation preparation work within one day.

Q2: What are the suitable operating temperatures for the equipment? How can asphalt performance be ensured in low-temperature environments?

A2: The normal operating temperature range for the equipment is -10℃ to 40℃. In low-temperature environments (below 0℃), the following technical measures can be used to ensure asphalt performance:

① The asphalt tank and conveying pipelines are equipped with double insulation (heat transfer oil heating + electric tracing), and real-time temperature monitoring is implemented;

② Enhanced insulation measures are applied to the finished product silo, and auxiliary heating devices are activated when necessary;

③ Mixing process parameters are optimized, and the mixing time is appropriately extended by 5-10 seconds to ensure uniform material mixing;

④ Before starting the equipment, all pipelines and the mixing tank are preheated to prevent asphalt from solidifying upon contact with low-temperature components.

Q3: Can the equipment’s production capacity be adjusted according to project requirements? How is the quality stability of different mixed materials ensured?

A3: The equipment’s production capacity can be flexibly adjusted through the control system.  The specific production rate can be set within the rated capacity range (80-240 t/h) according to the type of mixture and project progress requirements.  The core technical measures to ensure the stable quality of different mixture formulations are as follows:

① The control system supports the storage of over 100 recipes, eliminating the need for recalibration during recipe switching; recipes can be directly recalled and used;

② The high-precision weighing system integrates dynamic compensation functionality to correct measurement errors in real time;

③ The mixing blades are optimized using fluid dynamics principles to ensure thorough mixing of materials with different particle sizes;

④ Key parameters such as mixture temperature and weight are monitored in real time during production, and the system automatically triggers alarms and implements corrective measures if parameters are abnormal.

Q4: What are the maintenance cycle and key maintenance points for the equipment?

A4: The core maintenance cycle and technical points are as follows:

① Daily maintenance: Clean dust from the dust collection system, check the sealing of all pipelines, and lubricate the mixing shaft bearings;

② Weekly maintenance: Calibrate the accuracy of the weighing sensors, tighten all connecting bolts, and check the wear condition of the mixing blades;

③ Quarterly maintenance: Replace hydraulic oil and lubricating oil, check the operating status of the reducer, and clean the inner lining of the asphalt tank;

④ Annual maintenance: Conduct a comprehensive inspection of the electrical system performance, replace worn liners and blades, and calibrate the accuracy of the control system. ACE Group provides regular maintenance technical guidance and on-site services to ensure the long-term stable operation of the equipment.

Q5: Compared to traditional stationary concrete batching plants, what is the energy consumption of mobile equipment? Is it more energy-efficient?

A5: The energy consumption per unit of the ACE Group mobile concrete mixing plant is comparable to traditional fixed equipment, approximately 8-10 kg of standard coal per ton of mixed material, and it offers even better energy-saving benefits under certain operating conditions.

① Modular design shortens material conveying distances and reduces energy consumption of the conveying system;

② The intelligent control system automatically adjusts the motor’s operating power according to the production load, avoiding unnecessary energy consumption;

③ The insulation system uses high-efficiency insulation materials to reduce heat loss and lower the energy consumption of the heating system;

④ The equipment can be positioned close to the work area, shortening the transportation distance of the mixed materials and indirectly reducing the overall energy consumption of the project.

Q6: Does the equipment comply with the latest environmental standards? If local environmental regulations are upgraded, can the equipment be modified to meet the new standards?

A6: The equipment has passed third-party environmental testing before leaving the factory, with dust emission concentration ≤ 10mg/m³ and noise ≤ 85dB, complying with the latest national standards such as the “Emission Standard of Air Pollutants for Asphalt Concrete Mixing Plants” (GB 40850-2021). If local environmental protection requirements are upgraded, the following technical modifications can be implemented to meet the new standards:

① Upgrading the dust removal system and adding an activated carbon adsorption device to treat odors;

② Installing exhaust gas desulfurization and denitrification devices to reduce NOx and SO₂ emissions;

③ Upgrading the wastewater treatment system to achieve higher standards for water resource recycling.  ACE Group can provide customized retrofit solutions to ensure that equipment consistently meets environmental control requirements.

VI. Conclusion

Asian Construction Equipment Group Co., Ltd. is always guided by customer needs, relying on continuous technological innovation and product optimization to provide efficient, flexible, and environmentally friendly mobile asphalt mixing plant system solutions for the road engineering industry. From equipment research and development and manufacturing to installation, commissioning, and operation and maintenance services, the company provides comprehensive technical support throughout the entire process with its professional technical team, helping customers reduce construction costs, improve project quality, and ensure project progress.  For detailed equipment technical parameters, customized solutions, or on-site testing services, please contact Asian Construction Equipment Group Co., Ltd..We will provide you with comprehensive professional technical support.

Disclaimer: The technical parameters, application scenarios, and solutions for mobile asphalt mixing plants discussed in this article are based on Asian Construction Equipment Group Co., Ltd. existing technology and industry experience, and are for engineering construction reference only. Actual application requires adaptation and adjustment based on specific project conditions, local policies and regulations, and equipment configuration. Asian Construction Equipment Group Co. assumes no direct or indirect responsibility for any consequences arising from the use of the information contained in this article.

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What steps should be followed in sequence when disassembling and assembling the dust collector filter bags in an asphalt mixing plant?

As a core component of the environmental protection system in asphalt mixing plants, the filtration performance of dust collector bags directly affects the compliant operation of the equipment and the achievement of environmental emission standards.  Asian Construction Equipment Group Co., Ltd. (abbreviated as​ ACE Group), specializing in the research, development, and maintenance services of environmental protection equipment for asphalt mixing plants, has developed this standardized replacement guide based on years of practical engineering experience. This guide strictly adheres to industrial safety regulations and environmental protection requirements, detailing the entire process and key operational points for replacing dust collector bags.  Its aim is to provide relevant maintenance personnel with professional, safe, and efficient practical guidance, ensuring the stable operation of the dust collection system, extending equipment lifespan, and helping mixing plants achieve green production.

I. Preliminary Preparations (Safety and Basic Security Phase)

1. Shutdown, power outage, and safety precautions

Before performing any maintenance work, a strict shutdown and lockout procedure must be followed: first, shut down the asphalt mixing plant step by step according to the operating procedures. After the main unit and dust removal system have completely stopped, disconnect the main power supply to the dust collector, fan, and other related equipment, and hang a “Under Maintenance, Do Not Energize” safety warning sign to prevent accidental startup and potential accidents. Operators must wear complete protective equipment according to regulations, including anti-static work clothes, dust-resistant gloves, impact-resistant safety glasses, and a dust mask (KN95 or higher level is recommended) to prevent dust inhalation and mechanical injuries.

2. Site cleanup

Thoroughly clean the exterior of the dust collector casing, the area around the manhole door, and the work area, removing debris, accumulated dust, and unrelated tools to ensure unobstructed access.  During the cleaning process, high-pressure air blowing can be used in conjunction with brooms and rags.  Special attention should be paid to cleaning dust and debris from the sealing surface of the manhole door to prevent contaminants from falling into the dust collector during replacement, which could affect subsequent sealing performance and bag filter efficiency.

3. Inspection of the main structure of the dust collector

A comprehensive inspection should be conducted on key structural components such as the dust collector casing, tube sheet, suspension brackets, and pulse jet cleaning system: check the casing for deformation, weld cracks, or corrosion and leakage; specifically verify the flatness of the tube sheet (allowable deviation ≤2mm/m), ensuring that the edges of the tube sheet holes are free of burrs, cracks, and deformation to prevent dust leakage due to poor contact between the filter bags and the tube sheet after installation; check the stability of the suspension brackets, and if there is any looseness or corrosion, reinforce or replace them promptly to ensure the stability of the filter bag suspension.

4. Selection and pretreatment of new filter bags

Based on the flue gas temperature, dust characteristics (dust concentration, particle size), and operating conditions of the asphalt mixing plant, select dust collector filter bags of suitable material and specifications (high-temperature and acid-alkali resistant FMS or PTFE composite filter materials are recommended, suitable for temperatures ≤260℃).  New filter bags must have a product qualification certificate and be inspected individually before installation to ensure there are no defects such as damage, holes, or loose threads, and that the filter bag expansion rings have good elasticity. During the pre-treatment stage, place the new filter bags in a clean and well-ventilated environment for more than 24 hours to eliminate packaging odors and moisture generated during transportation and storage, thus avoiding any impact on filtration performance.

5. Preparation of specialized tools

Prepare a complete set of specialized tools, including: a torque wrench (matching the clamp bolt specifications), Phillips/flathead screwdrivers, a special bag removal tool, non-slip ropes (with a load capacity of ≥50kg), a copper brush (to avoid scratching the panel), sealing strips (for backup), cleaning cloths, and a dedicated storage bag for used bags.  All tools must be checked for proper working condition in advance and arranged in an orderly manner to ensure efficient replacement work.

II. Core Replacement Steps (Precise Operation Phase)

1. Remove the old cloth bag.

After opening the dust collector’s access door, ventilate the area for 15-30 minutes to reduce the internal dust concentration. When entering the interior for work, a safety harness must be worn, and a designated person must be present for supervision.The removal process depends on the bag’s fixing method: For clamp-type fixing, use a torque wrench to loosen the clamp bolts, remove the clamp, and then grasp the top of the filter bag and pull it vertically upwards to detach the bag’s retaining ring from the tube sheet hole; for tie-down type fixing, use bag removal pliers to untie the binding ropes, taking care to avoid leaving any rope fragments behind.If the manhole opening is too narrow to remove the filter bag in one piece, the “upper binding and sectional cutting” method can be used: first, secure the upper part of the filter bag with a rope, pull out one-third of its length through the manhole opening, and then cut it horizontally from the bottom using a special tool. Remove the bag in sections to avoid damaging the tube sheet and adjacent components during the pulling process. The removed old filter bags must be immediately placed in sealed storage bags to prevent dust dispersion and then disposed of according to hazardous waste treatment regulations.

2. Cleaning of the ceiling panel and mounting surface.

After removing the old filter bags, use a copper brush and a vacuum cleaner to clean the surface of the tube sheet, the holes, and the surrounding areas to remove dust, debris, and fragments of the damaged filter bags, ensuring no dust remains.  The edges of the tube sheet holes should be polished and trimmed to remove burrs. Wipe the sealing surface of the tube sheet with a cloth dampened with industrial alcohol. After drying, check for flatness. If there are any uneven areas, use shims to level them, ensuring a proper fit for the new filter bags.

3. Precise installation of the new filter bag.

Slowly unfold the pre-treated new filter bag, ensuring the bag’s expansion ring is facing the tube sheet.  Using both hands, hold the top of the filter bag and lower it vertically into the hole in the tube sheet, ensuring the expansion ring is fully seated in the groove of the tube sheet hole.Key operating points for the fixing method: When using clamp-type fixing, insert the clamp onto the upper opening of the filter bag, ensuring it is tightly against the lower surface of the tube sheet. Tighten the bolts with a torque wrench to the specified torque (generally 8-12 N·m), ensuring even force distribution on the clamp to prevent damage to the filter bag due to overtightening or leakage due to looseness. When using tie-down fixing, use high-temperature-resistant rope to evenly tie 3-4 turns along the edge of the tube sheet hole, with the knot positioned below the tube sheet, ensuring the tie-down is secure and does not loosen. During installation, ensure the filter bags are perpendicular to the tube sheet, and the spacing between adjacent filter bags is controlled at 5-10 cm to prevent damage from friction caused by airflow turbulence during operation.

4. Bag position calibration

After the single-compartment filter bags are installed, observe the distribution of the filter bags from multiple angles through the manhole door. Gently adjust any misaligned filter bags using a long rod tool to ensure they are neatly arranged and evenly spaced. Verify that all filter bags are suspended at the same height (allowable deviation ≤3cm). If there are height discrepancies, adjust the expansion ring insertion depth or replace the suspension accessories to level them. Check the distance between the bottom of the filter bags and the dust collector hopper wall to ensure it is ≥20cm to prevent dust accumulation from causing filter bag blockage.

5. Installation quality verification and reinforcement

Each filter bag’s installation quality was checked individually: verifying that the expansion ring and the hole in the tube sheet were tightly fitted, and that the filter bag did not loosen when gently pulled by hand; checking that the filter bag was free from twisting, creasing, or damage; and confirming that there were no missing clamp bolts or tie ropes.  Key areas were reinforced: the bottom of the filter bag was reinforced with high-temperature stitching or fitted with wear-resistant rings to prevent damage from collision with hard objects in the hopper during operation; the sealing strips on the edge of the tube sheet were inspected, and replaced promptly if aged or damaged, to improve overall sealing performance.

III. Post-implementation support (Stable operation phase)

1. System restoration and trial run

After the replacement work is completed, thoroughly clean the inside of the dust collector and remove all tools, debris, and dust from the work area. Close the manhole door, ensuring that the sealing strip is properly compressed.  Restore power according to the asphalt mixing plant startup procedure. First, start the dust collector fan for 5 minutes of no-load operation, checking for any abnormal noises or leaks; then, start the main unit for a load test run, gradually increasing the load to normal operating conditions.

2. Monitoring and debugging of operating parameters

During the trial operation period, key parameters of the dust removal system will be monitored: the pressure difference between the inlet and outlet of the dust collector (normal range 500-1500 Pa), flue gas emission concentration (which must meet the requirements of GB 20426-2021 “Emission Standard of Air Pollutants for Asphalt Concrete Industry,” with particulate matter emission concentration ≤ 10 mg/m³), fan operating current, and equipment vibration. If a sudden increase in pressure difference occurs (>2000 Pa), it may indicate that the filter bags are installed too tightly or are blocked, requiring a shutdown for inspection. If the emission concentration exceeds the standard, the filter bags should be checked for damage or improper sealing, and corrective actions should be taken promptly.

3. Standardized operation and maintenance management

Establish a complete lifecycle maintenance record and develop a standardized inspection system: daily inspections should record the operating status of the filter bags (checking for damage or detachment) and pressure differential changes; the dust collector hopper should be cleaned weekly to prevent excessive dust accumulation from compressing the filter bags; adjust the cleaning cycle according to operating conditions, generally performing pulse cleaning every 4-8 hours to ensure thorough cleaning without damaging the filter bags.  It is recommended to conduct a comprehensive inspection of the filter bags every 6 months, and promptly replace batches of filter bags in compartments with a damage rate exceeding 5% to ensure the long-term stable operation of the dust collection system.

Asian Construction Equipment Group Co., Ltd. has always adhered to the philosophy of “precise operation and maintenance, green empowerment.” This guide is compiled based on practical engineering experience and can be flexibly adjusted according to the specific parameters of different asphalt mixing plants and dust removal equipment.  For customized operation and maintenance solutions, high-quality compatible filter bags, or professional technical support, please contact the Asian Construction Equipment Group Co., Ltd. technical service team. We will provide you with comprehensive environmental equipment operation and maintenance services to help your company achieve safe, efficient, and compliant production.

Note: The content of this article is for general reference only and does not represent a precise fit for specific scenarios. Please follow professional guidelines for actual applications.

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What are the key aspects of daily maintenance for an asphalt mixing plant?

As a company that has been deeply involved in the research, development, production, and service of asphalt mixing plant equipment for many years, Asian Construction Equipment Group Co., Ltd. (abbreviated as ACE Group) has always adhered to the philosophy of “customer-centricity and technology-driven.” We deeply understand that asphalt mixing plants, as core infrastructure for road construction and maintenance, have their stable and efficient operation directly determining construction progress, project quality, and project profitability.  Based on years of frontline service experience, we have compiled and optimized the core system for daily maintenance of asphalt mixing plants and have written this guide to provide our customers with professional, practical, and targeted maintenance solutions, helping them maximize the value of their equipment throughout its entire lifecycle.

I. Introduction

With the high-quality advancement of infrastructure construction in my country, the application scenarios of asphalt mixing plants are continuously expanding, playing a crucial role in everything from expressways and municipal main roads to rural road renovations.  As the core equipment for producing high-quality asphalt mixtures, its operating status is closely linked to the efficiency, cost, and quality of construction projects. However, it is important to note that asphalt mixing plants operate under harsh conditions of high temperature, dust, and heavy loads for extended periods. Core components are prone to wear and tear, pipeline aging, and parameter drift. If daily maintenance is neglected, minor problems can easily escalate into major malfunctions, leading to downtime losses and potentially affecting project progress and quality.Therefore, establishing a scientific and comprehensive daily maintenance system is crucial for ensuring the stable operation of equipment, and it is also one of the core focuses of ACE Group’s services to its customers.

II. The Core Value of Daily Maintenance for Asphalt Mixing Plants

Routine maintenance is not simply about “fixing things,” but rather a systematic management process that spans the entire lifecycle of the equipment. Its core value is reflected in the following four dimensions, which also serve as the core principles for ACE Group’s maintenance solutions for its clients:

1. Extend the entire lifecycle of the equipment.

An asphalt mixing plant consists of several core modules, including the mixing unit, drying drum, burner, screening system, weighing system, and conveying system, all of which operate collaboratively and are interconnected. Through extensive practical case studies, ACE Group has verified that scientific daily maintenance can effectively identify and address potential equipment problems. For example, regularly lubricating the mixing unit bearings with specialized grease can effectively reduce metal friction and wear; and promptly cleaning the caked material from the inner wall of the drying drum prevents operational imbalances caused by uneven wall thickness. This approach prevents small problems from accumulating into major malfunctions, significantly extending the equipment’s service life and improving the return on investment.

2. Ensure stable production efficiency.

Equipment stability is a prerequisite for efficient production. During peak construction periods, even one hour of equipment downtime can lead to cascading delays in subsequent processes. Through routine maintenance, the optimal operating condition of each component can be ensured: for example, regularly cleaning blockages in the screening system ensures smooth aggregate screening and prevents insufficient material supply from affecting the efficiency of the mixing process; timely inspection and adjustment of conveyor belt tension prevents belt slippage and misalignment that can interrupt material transport, thus minimizing unplanned downtime and ensuring continuous and stable production.

3. Reduce overall operating costs.

The losses caused by equipment failure include not only repair costs but also hidden costs such as downtime losses, material waste, and premium prices for emergency spare parts. ACE Group reminds its customers that routine maintenance is a “low-cost, high-return” investment: for example, timely replacement of worn mixing blades can prevent uneven mixing of materials due to excessive blade clearance, reducing waste; regular inspection of oil and air lines for leaks can prevent fuel and compressed air leaks, lowering energy costs. Statistics show that customers who consistently perform routine maintenance can reduce their annual equipment maintenance costs by more than 30%.

4. Ensure the quality of construction work.

The quality of asphalt mixture directly determines the load-bearing capacity and service life of the road, and the stability of equipment operating parameters is crucial to ensuring the quality of the mixture.  Routine maintenance, through regular calibration of the weighing system, ensures that the proportion of aggregates, asphalt, and fillers meets design requirements; regular inspection of the burner’s air-fuel ratio ensures uniform heating of aggregates in the drying drum, preventing performance degradation of the mixture due to temperature fluctuations. ACE Group firmly believes that high-quality equipment maintenance is a vital guarantee of project quality.

III. Core Aspects of Daily Maintenance for Asphalt Mixing Plants

Combining the structural characteristics of the equipment with years of service experience, ACE Group has organized its daily maintenance procedures into five core modules: lubrication, cleaning, inspection and adjustment, replacement of wear parts, and electrical system maintenance. These modules are interconnected, forming a complete maintenance system.

1. Precise lubrication and maintenance

Lubrication is crucial for reducing mechanical wear and tear, and the following principles should be followed: “precise oil selection, timely replenishment, and regular inspection.”

• Lubrication of core components: For key moving parts such as the mixing unit bearings, gearbox, drying drum support rollers, and drive chains, use lithium-based grease or gear oil that meets the requirements specified in the equipment manual, and add or replace them periodically (e.g., lubricate the mixing unit bearings every 50 hours, and replace the gear oil in the gearbox every 2000 hours);

• Lubrication System Inspection: Check the oil level and oil quality of the lubrication station daily. If the oil is cloudy, contains impurities, or the oil level is below the warning line, filter or replace the oil promptly. Regularly check the oil pipes and nozzles for blockages or leaks to ensure the lubrication system is functioning properly.

2. Comprehensive cleaning and maintenance

Equipment cleaning not only prevents dust and oil from corroding components, but also facilitates the timely detection of potential malfunctions.

• Screening and Conveying System: Clean the surface and surrounding areas of the screening machine’s screen daily to prevent screen blockage; regularly clean the hoppers and inner walls of the belt conveyors and screw conveyors to prevent material adhesion and accumulation;

• Dust removal and heating system: Regularly clean the filter bags of the bag filter dust collector, check for any damage to the filter bags, and ensure that the dust removal effect meets the standards; clean the caked material and deposits on the inner wall of the drying drum to prevent affecting heating efficiency and drum balance;

• Electrical control and hydraulic systems: Regularly clean dust from inside the electrical control cabinet and check that the cooling fans are working properly; clean oil and dust from the surface of the hydraulic power unit’s oil tank, and check for clogging of the hydraulic oil filter.

3. Thorough inspection and precise adjustment

Regular inspection and adjustment are the core methods for ensuring stable equipment parameters, and these should cover all critical aspects of the equipment:

• Fastening Inspection: Daily check that all connecting bolts, anchor bolts, and fasteners are not loose, especially on components with significant vibration such as the mixing unit and drying drum. Tighten any loose fasteners immediately.

• Transmission system adjustment: Regularly check the tension of the transmission belts and chains; if they are loose, adjust or replace them promptly; check the coaxial alignment of the sprockets and pulleys to prevent misalignment and abnormal noises during operation;

• Weighing System Calibration: The weighing system (aggregate scale, asphalt scale, and powder scale) shall be calibrated at least once a week using standard weights to ensure that the measurement error is within the equipment’s allowable range;

• Combustion system adjustment: Regularly check the combustion status of the burner, observe the flame color and shape, and adjust the air-fuel ratio promptly to ensure complete combustion of the fuel and prevent black smoke emissions and excessive fuel consumption.

4. Replace vulnerable parts promptly.

Wear-prone parts are the “hot spots” for equipment wear and tear; a logbook should be maintained and these parts replaced promptly to avoid triggering cascading failures.

• Mixing system: Regularly inspect the wear of the mixing blades and liners. Replace them promptly when the wear exceeds the design threshold (e.g., when the blade thickness is reduced by 1/3).

• Conveying system: Check the conveyor belt for surface wear and edge damage. If cracks or delamination occur, repair or replace the belt promptly; check the idlers and rollers for smooth rotation, and replace them immediately if jamming or abnormal noises are detected;

• Screening system: Check the screen for damage and deformation. If there are holes or material leakage, replace the screen immediately;

• Sealing components: Regularly inspect the O-rings and gaskets in the oil and air lines, and replace them promptly if they show signs of aging or leakage.

5. Specialized maintenance of electrical systems

The electrical system is the “nerve center” of the equipment, and its safety and stability must be given top priority:

• Line inspection: Regularly check the insulation of cables and wires for damage or aging, and check for loose or overheating connections.  Repair or replace any faulty components promptly;

• Component inspection: Check the working condition of electrical components such as contactors, relays, and sensors, and clean any oxidation from the contact surfaces to ensure good contact;

• Safety protection: Check that safety devices such as emergency stop buttons, limit switches, and residual current devices are functioning correctly; regularly clean the cooling channels of the electrical control cabinet to ensure the internal temperature is maintained below 40℃.

IV. Implementation Strategies for Daily Maintenance of Asphalt Mixing Plants

High-quality maintenance content requires a scientific implementation strategy to be effective. ACE Group, based on its service experience, has developed a five-pronged maintenance implementation system for its clients: “Planning – Execution – Personnel – Documentation – Evaluation.”

1. Develop a customized maintenance plan.

Based on equipment model, service life, operating conditions (such as high temperature and high dust environments), and construction progress, a personalized maintenance plan is developed. This plan clearly defines daily, weekly, monthly, and quarterly maintenance tasks, operating standards, responsible personnel, and completion deadlines.  Specific maintenance plans are developed for critical components (such as the mixing unit and weighing system), and safety operating procedures during maintenance (such as fall protection for working at heights and power-off procedures for electrical work) are also clearly defined.

2. Strictly implement the maintenance plan.

Arrange for professional personnel to carry out maintenance work according to the plan, avoiding the situation of “prioritizing production over maintenance”; establish a closed-loop mechanism of “inspection-maintenance-verification,” maintaining daily equipment inspection records, and meticulously documenting maintenance time, projects, personnel, results, and problems found; for major safety hazards discovered during maintenance, immediately shut down the equipment, report the issue, develop a rectification plan, and track the implementation of corrective actions until completion.

3. Strengthen professional training for maintenance personnel.

The professional competence of maintenance personnel directly determines the quality of maintenance.  ACE group recommends that clients regularly organize professional training for their maintenance staff, covering topics such as equipment structure and principles, maintenance procedures, fault diagnosis techniques, and safety precautions.  They also suggest inviting technical personnel from the equipment manufacturer to provide on-site practical guidance to improve personnel familiarity with the equipment, and encouraging maintenance personnel to obtain relevant professional certifications and establishing a skills assessment mechanism.

4. Establish a comprehensive equipment database.

A complete lifecycle file is established for each piece of equipment, covering equipment procurement contracts, technical documents, installation and commissioning records, and acceptance reports; operating records (such as operating time, production output, and operating parameters); maintenance records (such as maintenance items, cycles, and consumable replacement information); repair records (such as fault type, repair plan, and replaced parts); fault analysis reports, and performance evaluation reports.  Through this archived data, the equipment’s operating status can be accurately traced, providing data support for optimizing maintenance plans.

5. Conduct regular equipment performance assessments.

A comprehensive performance evaluation of the equipment is conducted quarterly or semi-annually, testing core indicators such as production capacity, stability of mixture quality, energy consumption levels, and failure rate.  Based on the evaluation results, shortcomings in maintenance work are analyzed, and the maintenance plan is optimized (e.g., adjusting maintenance cycles, adding maintenance items).  For aging or underperforming components, upgrade and modification plans are developed in advance to avoid impacting production.

V. Frequently Asked Questions from Customers

Based on ACE Group’s daily service experience, we have compiled the most frequently asked questions from customers regarding the daily maintenance of asphalt mixing plants and provide professional answers:

1. Do maintenance schedules need to be adjusted under different operating conditions?

Yes, it is necessary. If the equipment is operating in harsh conditions such as high temperatures, high dust levels, and continuous heavy loads (e.g., construction in high temperatures during summer, aggregate processing near mines), the maintenance cycle needs to be shortened (e.g., daily lubrication cycle shortened by 1/3, cleaning frequency increased to twice a day). If the equipment is used infrequently and the operating conditions are good (e.g., intermittent construction in small municipal projects), the maintenance cycle can be appropriately extended under the guidance of professional personnel, but the inspection and calibration of core components cannot be omitted.

2. What key points should be considered when replacing wear and tear parts?

It is necessary to select original or high-quality replacement parts that match the equipment model (such as the dedicated wear parts provided by ACE group) to avoid equipment damage caused by incompatible parts; before replacement, the installation area must be cleaned and polished to ensure a proper fit; after replacement, a test run should be conducted to verify the working condition of the component; at the same time, keep a record of wear part replacements and establish a consumption ledger to facilitate timely replenishment.

3. During the maintenance process, which safety points require particular attention?

Before electrical maintenance, the power must be switched off and a “Do Not Energize” sign must be posted, and the work must be performed by a qualified electrician; for work at height (such as cleaning the drying drum or inspecting the dust collector), safety belts must be worn and safety protection facilities must be erected; when cleaning high-temperature components (such as the drying drum and burner), wait until the equipment has cooled to a safe temperature to avoid burns; during maintenance, keep away from moving parts of the equipment to prevent entanglement and injury.

4. How can we determine if the maintenance work is effective?

This can be verified through three key indicators: whether the equipment failure rate has decreased (e.g., a reduction of more than 50% in monthly failure incidents); whether production efficiency is stable (e.g., achieving the target output of mixed materials per unit time, without production reductions due to equipment problems); and whether the quality of the mixed materials is qualified (e.g., the proportion accuracy and temperature stability meet the design requirements).  Simultaneously, by comparing energy consumption and spare parts costs before and after maintenance using equipment historical data, the return on investment of the maintenance efforts can be evaluated.

VI. Overview of Applicable Scenarios

This guide is applicable to the daily maintenance of various types of asphalt mixing plants, and is especially suitable for the following scenarios. ACE Group can provide customized services based on specific requirements:

1. Construction of concrete mixing plants to support the construction of new highways/major municipal roads.

These scenarios demand extremely high levels of production efficiency and mix quality, requiring a strong focus on weighing system calibration, burner maintenance, and ensuring continuous equipment operation.  A high-frequency maintenance model of “daily inspections + weekly specialized maintenance” is recommended, and ACE Group can provide on-site technical personnel for comprehensive guidance.

2. Maintenance of upgraded and renovated older concrete mixing plants

After upgrading and retrofitting older equipment, special attention is required to ensure the seamless operation of both new and old components.  Particular focus should be placed on maintaining the connection points between upgraded components (such as new electronic control systems and precision weighing modules) and the original parts. ACE Group can provide customized maintenance plans after the upgrade to ensure the equipment performs at its full potential.

3. Concrete mixing plants in remote areas/harsh environments (such as high-altitude or high-temperature desert regions)

In these types of scenarios, equipment maintenance is challenging, and spare parts procurement cycles are long. Therefore, it is necessary to strengthen preventive maintenance, stockpile core consumable parts in advance, and optimize lubrication and sealing solutions (such as using high and low-temperature resistant lubricants). ACE Group can provide a combination of remote fault diagnosis and regular on-site maintenance services.

4. Batching plants for small-scale municipal engineering projects/rural road maintenance

These types of devices are used infrequently, and maintenance personnel may lack sufficient expertise.  Therefore, we recommend a “lightweight maintenance plan” to simplify daily operations. ACE Group can provide on-site training and regular maintenance services to ensure the equipment operates stably during peak construction periods.

VII. Conclusion

Routine maintenance of asphalt mixing plants is a systematic and long-term task that directly impacts equipment operational stability, project quality, and corporate profitability. Drawing on years of technical expertise and service experience in the asphalt mixing plant field, Asian Construction Equipment Group Co., Ltd. consistently prioritizes the stable operation of its customers’ equipment. The maintenance system, core content, and implementation strategies outlined in this guide are all derived from practical field service experience.

In the future, Asian Construction Equipment Group Co., Ltd. will continue to provide comprehensive maintenance support to its customers, including customized maintenance plan development, professional technical training, genuine spare parts supply, remote fault diagnosis, and on-site maintenance services.  This will help customers maximize the value of their equipment through scientific maintenance management, ensuring the high-quality advancement of infrastructure construction. If you have any questions or needs regarding the daily maintenance of your asphalt mixing plant, please feel free to contact Asian Construction Equipment Group Co., Ltd. professional service team.

Notice: The product case studies, performance data, and customer feedback presented in this article are for industry exchange and reference purposes only, and do not constitute a guarantee of applicability to any specific scenario.

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Asphalt mixer technology upgrade

As a leading enterprise in China’s transportation infrastructure construction equipment field, Asian Construction Equipment Group Co., Ltd. (abbreviated as​ ACE Group) has been deeply involved in the research and development and manufacturing of asphalt mixing equipment for over 20 years, consistently focusing on the industry’s technical pain points and solving problems through independent innovation. With the deepening of my country’s new urbanization construction and the strategy of building a strong transportation nation, the requirements for the quality stability, production efficiency, and green and low-carbon properties of asphalt mixtures in major projects such as roads and bridges continue to rise.The core component of an asphalt mixing plant — the mixing mechanism — directly determines the homogeneity of the finished product, production energy consumption, and equipment lifespan. It is also a key bottleneck restricting the breakthrough of domestically produced high-end mixing equipment. Based on this, ACE Group assembled a dedicated R&D team and, after three years of technical research, completed a multi-dimensional optimization and upgrade of the mixing mechanism, forming a core technology system that combines independent intellectual property rights with engineering practicality, providing strong support for the high-quality development of the industry.

DHB Asphalt Drum Mix Plant

I. Current Industry Situation and the Strategic Significance of Technological Breakthrough

In recent years, my country’s transportation infrastructure construction has achieved leapfrog development. In 2023, the total length of newly built and reconstructed highways nationwide exceeded 120,000 kilometers, and the annual consumption of asphalt mixtures exceeded 500 million tons, driving the continuous growth of market demand for mixing equipment. However, significant shortcomings still exist behind the industry’s development: although most domestic enterprises have mastered the basic manufacturing technology of medium and large-sized mixing equipment, in the field of ultra-large equipment with a capacity of tens of millions of tons and a capacity of over 400t/h, foreign brands occupy more than 65% of the market share due to their core technological advantages, and domestic equipment faces the dilemma of being “large but not strong”.The core problem lies in the fact that the design theory and manufacturing process of the mixing mechanism lag behind the international advanced level, resulting in large fluctuations in the uniformity of the mixture, insufficient asphalt coating, severe equipment wear, and high energy consumption, which directly affect the quality of the project and the construction cost.

ACE Group deeply understands that optimizing and upgrading mixing mechanisms is not only an inevitable choice to enhance the core competitiveness of products, but also a strategic measure to promote the localization of high-end equipment and ensure the quality and safety of national transportation infrastructure construction. By breaking through the bottlenecks in mixing theory and structural design through technological innovation, the gap with international brands can be effectively narrowed, providing the industry with high-performance, low-energy-consumption, and long-life domestic solutions, demonstrating the technological responsibility and industrial commitment of national enterprises.

II. Multi-dimensional Technical Standards and Core Requirements for Asphalt Mixture Mixing

Modern engineering has upgraded the performance requirements for asphalt mixtures from the traditional macroscopic homogeneity to a multi-dimensional homogenization standard of “precise particle size distribution, sufficient asphalt coating, uniform microscopic dispersion, and stable temperature field.” This places stringent requirements on the design of mixing mechanisms.

1. Particle size distribution uniformity: Coarse and fine aggregates must strictly follow the design ratio to achieve uniform distribution in three-dimensional space, forming a dense and stable skeleton structure to ensure the load-bearing capacity and durability of the mixture;

2. Asphalt coating integrity: High-intensity shearing action breaks down the water film and adsorption layer on the aggregate surface, ensuring that the asphalt binder completely coats the aggregate particles and forms an asphalt film of uniform thickness;

3. Microscopic dispersion stability: Effectively breaks up aggregate agglomeration, ensuring that fillers, admixtures and other components are uniformly dispersed in the asphalt matrix, thus constructing a stable suspension-compact system;

4. Temperature field consistency: During the mixing process, local overheating should be avoided to prevent asphalt aging, or local undercooling to prevent insufficient coating. Ensure that the temperature fluctuation of the mixture outlet is controlled within ±3℃.

5. Green and low-carbon adaptability: While meeting the mixing quality requirements, it minimizes energy consumption and equipment wear, meeting the green development requirements of engineering construction.

III. Innovative Design and Technological Breakthroughs of ACE Group’s Mixing Mechanisms

Addressing the industry’s technical pain points, the R&D team at ACE Group, based on fluid mechanics and particle dynamics simulation analysis and combined with over a thousand experimental verifications, has developed a three-dimensional optimization system of “fluid state optimization + structural upgrade + material innovation,” achieving a leap in the performance of the mixing mechanism.

(一) Innovation in material flow movement mode: design of circulation-shear composite flow pattern

Traditional twin-shaft mixers, operating in either counter-current or purely circumferential flow patterns, suffer from issues such as material retention, insufficient shear strength, and uneven liner wear. ACE Group has innovatively developed a “circulation-shear composite flow” technology, achieving three major breakthroughs through an asymmetric phase angle mixing arm arrangement and optimized guide vane design:

1. It adopts a zoned design of “main mixing zone + auxiliary shearing zone”. The main mixing zone uses a spiral mixing arm to push the material to form a closed circulation, ensuring macroscopic uniformity; the auxiliary shearing zone is equipped with high-strength shearing teeth to form a local turbulent field and enhance the microscopic dispersion effect.

2. Optimize the phase angle of the stirring arm arrangement, controlling the phase difference between adjacent stirring arms to 45°, avoiding material stagnation zones at the shaft ends and corners of the housing, and increasing the material circulation rate by 30%;

3. An innovative guide vane angle adjustment mechanism can dynamically adjust the material flow rate according to the aggregate gradation and asphalt grade, adapting to different working conditions and improving mixing adaptability by 40%.

Compared with the traditional method, the composite flow design improves the wear uniformity of the liner by 50%, extends the service life of the equipment by 35%, and increases the shear strength by 25%, effectively solving the problem of insufficient asphalt coating.

(二) Precise optimization of core structural parameters

Based on a multi-objective optimization algorithm, ACE Group accurately calibrates the key parameters of the mixing mechanism:

(1).Blade helix angle: Adopting a variable helix angle design of 17°-19°, it takes into account both axial conveying efficiency and radial mixing intensity, increasing the axial conveying speed of materials by 20% and avoiding local accumulation;

(2).Stirring arm spacing and angle: The spacing between adjacent stirring arms is optimized to 120mm, and the angle is set to 75° to form a continuous stirring trajectory, reducing the material residence time to less than 2s;

(3).Main and auxiliary shaft speed matching: Utilizing variable frequency speed control technology, the speed difference between the main and auxiliary shafts is stabilized at 17%-18%, forming an efficient shear field and reducing the coefficient of variation of asphalt film thickness by 40%.

(4).Innovative Liner and Blade Materials: Utilizing NM450 wear-resistant alloy steel and a ceramic composite coating, a “stepped self-cleaning liner” was developed, extending service life by 60% and reducing uneven mixing caused by material adhesion. Upgraded Sealing and Heat Dissipation Structure: Adopting a double-seal + negative pressure dustproof design, combined with a forced air cooling system, reduces equipment failure rate by 30%, adapting to harsh working conditions such as high temperatures and dust.

(三) Integration of intelligent control technology: adaptive adjustment system for operating conditions

ACE Group has deeply integrated intelligent sensing technology with the mixing mechanism to develop a “condition-adaptive adjustment system”: equipped with an infrared temperature sensor, a material level sensor, and a torque sensor, it monitors parameters such as the temperature of the mixture, the material level, and the mixing resistance in real time;

A database of mixing parameters is established based on big data algorithms. The speed, mixing time, and blade angle can be dynamically adjusted according to aggregate moisture content, gradation changes, asphalt viscosity, etc., to achieve “one machine adapting to multiple working conditions”.

It integrates remote diagnostics and predictive maintenance modules, which can provide early warnings of wear and tear on vulnerable parts through equipment operation data analysis, thereby reducing operation and maintenance costs.

IV. Engineering Application Case: Epoxy Asphalt Paving Project for Steel Deck of a Cross-Sea Bridge

A provincial-level eight-lane expressway reconstruction and expansion project, with a total length of 89 kilometers, requires the supply of 1.2 million tons of asphalt mixture, with stringent requirements for the uniformity, durability, and production efficiency of the mixture. The project adopted a mixing plant equipped with a new composite fluid mixing mechanism. After six months of practical application, third-party testing data showed:

· The standard deviation of Marshall stability decreased from 1.3kN to 0.7kN, with a coefficient of variation ≤5%, which is better than the industry limit of 10%.

· The average thickness of the asphalt film was 68μm, and the coefficient of variation was optimized from 16% to 8%.

· The actual production efficiency of a single machine reaches 420t/h, which is 5% higher than that of traditional equipment, and the unit energy consumption is reduced to 8.2kg standard coal/t, a 15% reduction in energy consumption;

· The equipment can operate continuously without failure for up to 720 hours, reducing the failure rate by 32% and extending the replacement cycle of vulnerable parts to 8,000 hours.

· The road surface achieved a 100% pass rate in the first inspection of core indicators, and there were no early damages, ruts, or other defects within three months of opening to traffic.

V. Technical Summary and Future Outlook

By innovating the flow pattern, optimizing the structure, and integrating intelligence into the mixing mechanism, ACE Group has successfully addressed the industry pain points of traditional mixing equipment — namely, poor uniformity, high energy consumption, and rapid wear — achieving simultaneous improvements in mixing quality, production efficiency, and green, low-carbon practices. This technological breakthrough not only demonstrates ACE Group’s independent innovation capabilities but also drives the transformation of domestically produced high-end asphalt mixing equipment towards “precision, intelligence, and greenness,” providing reliable domestic equipment support for transportation infrastructure construction.

In the future, Asian Construction Equipment Group Co., Ltd. will continue to deepen its technological research and development: First, it will focus on the integration of intelligent control and digital twin technology to build a visualized management system for the entire life cycle of the mixing process; second, it will explore the application of new environmentally friendly materials and mixing mechanisms to further reduce energy consumption and carbon emissions; and third, it will expand the research and development of ultra-large capacity (above 600t/h) mixing equipment to overcome the technical challenges of mixing under extreme working conditions.

Asian Construction Equipment Group Co., Ltd. will always take technological innovation as its core driving force, adhere to the product philosophy of “independent and controllable, high performance, green and low carbon”, and continuously provide the industry with more competitive high-end equipment and solutions, injecting a continuous stream of technological power into the construction of a transportation powerhouse.

Note: The technical points and development suggestions in this article are for industry reference only. Specific applications should be considered in conjunction with the actual working conditions of the project.

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ACE Group Standard: Precise Explanation of Core Professional Terms for Concrete Mixing Plants

In the field of asphalt pavement engineering, technical terminology is the core carrier of technical communication, equipment operation, and engineering construction. As a high-tech enterprise specializing in the R&D and manufacturing of asphalt mixing equipment and engineering technical services, Asian Construction Equipment Group Co., Ltd. (abbreviated as ACE Group)

 deeply understands the importance of standardized and precise terminology application in ensuring project quality and improving construction efficiency. This article, combining industry standards and ACE Group’s technical practices, systematically sorts out, optimizes, and expands the core technical terminology related to asphalt mixing plants, covering four core dimensions: materials, mixtures, construction, and equipment, providing authoritative reference for industry colleagues.

I. Materials (ACE Group’s Preferred Standard Compatible Materials)

1. Asphalt: A blackish-brown solid/semi-solid viscous substance obtained through crude oil distillation, solvent extraction, or coal processing, or naturally occurring. It is the core binder of asphalt mixtures. ACE Group recommends using petroleum asphalt that conforms to the GB/T 15180 standard, suitable for different climate zones and engineering strength requirements. It covers three major categories: natural asphalt, petroleum asphalt, and coal tar pitch. Its penetration, ductility, softening point, and other indicators must be precisely matched with the process parameters of the mixing equipment.

2. Coarse aggregate: Aggregates such as crushed stone, crushed gravel, screened gravel, and slag with a particle size greater than 2.36mm in asphalt mixtures are the core components constituting the aggregate skeleton structure. The coarse aggregates compatible with ACE Group’s mixing equipment must meet the technical requirements of a crushing value ≤26% and an abrasion value ≤28%, with a predominantly cubic particle shape to ensure the stability of the skeleton interlocking.

3. Fine aggregate: This refers to natural sand, manufactured sand, and stone chips with a particle size less than 2.36mm in asphalt mixtures. Its core function is to fill the gaps between coarse aggregates and improve the density of the mixture. ACE group recommends using fine aggregates with high cleanliness and a mud content ≤3%, with an angularity index ≥30s for better adhesion to asphalt.

4. Filler: Mineral powder with a particle size of less than 0.075mm, common types include cement, lime, fly ash, and finely ground limestone powder. ACE Group’s mixing equipment and its matching powder supply system can precisely control the filler dosage, requiring a specific surface area ≥300m²/kg, which can significantly improve the cohesion and water stability of asphalt mixtures.

5. Modified asphalt: Asphalt binder with properties optimized by adding modifiers such as rubber, resin, polymers (e.g., SBS, SBR), and finely ground rubber powder, or by undergoing slight oxidation processing. ACE Group’s intelligent mixing equipment can achieve precise metering and uniform dispersion of modifiers, and is compatible with mainstream products such as SBS modified asphalt and rubber modified asphalt, meeting the anti-rutting and anti-aging requirements of high-grade highways.

6. Emulsified asphalt: A uniformly dispersed system (asphalt emulsion) made by high-speed shear emulsification of petroleum asphalt (or coal tar pitch) and water under the action of emulsifiers and stabilizers. It is classified into spray type (for tack coat and primer coat) and mixing type (for ambient temperature mixtures) according to application scenarios. ACE Group’s ambient temperature mixing equipment is compatible with emulsified asphalts with different demulsification rates, ensuring uniform mixing.

7. Cationic emulsified asphalt: Positively charged emulsified asphalt prepared with cationic emulsifiers has strong adhesion to acidic aggregates (such as granite), fast demulsification speed, and is suitable for tack coat and prime coat construction. ACE Group’s asphalt distributor truck can achieve precise spraying.

8. Anionic emulsified asphalt: negatively charged emulsified asphalt prepared with anionic emulsifiers has good compatibility with alkaline aggregates (such as limestone), high mixing stability, and is often used for mixing asphalt mixtures at room temperature.

9. Modifiers: External admixtures that improve the performance of asphalt, including polymers such as SBS (styrene-butadiene-styrene block copolymer), SBR (styrene-butadiene rubber), and PE (polyethylene), as well as finely ground rubber powder and fibers. ACE Group’s mixing equipment is equipped with a dedicated modifier addition device, enabling metering with an accuracy of 0.1%.

10. Stabilizers: Additives used to improve the storage stability of emulsified asphalt (such as calcium chloride and bentonite) to prevent asphalt particles from segregating. ACE Group recommends using stabilizers that meet the JT/T 375 standard to ensure that the emulsion shelf life is ≥6 months.

11. Solvent: A volatile liquid (such as gasoline, kerosene, diesel) used to dilute petroleum asphalt to produce liquid petroleum asphalt. ACE Group’s mixing equipment is equipped with a solvent storage and metering system to ensure accurate and controllable dilution ratio.

II. Mixed Materials (ACE Group Mixing Equipment Adaptation System)

1. Asphalt mixture: The general term for mixtures formed by mixing mineral aggregates (coarse aggregates, fine aggregates, and fillers) with asphalt binders in a designed ratio. It is the core road construction material for asphalt pavements. ACE Group’s mixing equipment can achieve precise proportioning and production of different types of mixtures.

2. Asphalt Concrete Mixture: Asphalt concrete, also known as asphalt concrete, is a mixture of coarse aggregate, fine aggregate, and filler aggregates arranged in a continuous gradation, mixed with asphalt to produce a mixture that meets technical standards (represented as LH when graded using a round-hole sieve). ACE Group’s forced intermittent mixing equipment can achieve a mix proportion deviation of ≤±2% for this type of mixture, meeting the requirements for high-grade highway surface layers.

3. Dense-graded Asphalt Concrete: A mixture with continuous aggregate gradation and dense interlocking particles, resulting in a residual void ratio of <10% after compaction. Type I dense-graded asphalt concrete (void ratio 3%–6%, 2%–6% for pedestrian roads) is suitable for main road surfaces; Type II semi-dense-graded asphalt concrete (void ratio 4%–10%) is suitable for secondary roads. ACE Group’s intelligent control system can monitor the void ratio in real time.

4. Semi-open graded asphalt mixture: also known as asphalt macadam mixture (represented by LS when graded by round hole sieve), it is made by mixing coarse aggregate, fine aggregate and a small amount of filler (or no filler) with asphalt. The residual void ratio after compaction is >10%. It is suitable for road base or subbase. ACE Group’s mixing equipment can adjust the mixing time to ensure uniformity.

5. Open-graded asphalt mixture: The aggregate gradation is mainly coarse aggregate with a low content of fine aggregate. The particles are dispersed and the porosity after compaction is >15%. It has drainage and noise reduction functions and is often used for the surface layer of drainage pavement. ACE Group equipment can accurately control the fine aggregate content to meet the gradation requirements.

6. Gap-graded Asphalt Mixture: The aggregate gradation is missing one or more particle size grades (such as missing 4.75~9.5mm particles), forming a skeleton-void or skeleton-dense structure, such as OGFC (open-graded drainage asphalt wearing course). ACE Group’s mixing equipment supports custom gradation curve settings.

7. Emulsified asphalt aggregate: This is an ambient temperature mixture made by mixing emulsified asphalt and aggregates at room temperature. It has a compaction residual void ratio of >10%, is energy-saving and environmentally friendly, and is suitable for low-grade highways or maintenance projects. ACE Group’s ambient temperature mixing plant can achieve high-efficiency production.

8. Modified asphalt mixture: Asphalt mixtures using modified asphalt as binder have excellent resistance to rutting and cracking. ACE Group’s mixing equipment is equipped with a dedicated modified asphalt heating and mixing system to ensure stable performance of the mixture.

9. Colored Asphalt Mixture: A mixture made by adding colored pigments and special modifiers, suitable for landscape roads and sidewalks. ACE Group equipment is compatible with precise metering of pigment addition.

10. Recycled Asphalt Mixture: A mixture made by adding recycled asphalt pavement material (RAP material). ACE Group’s recycled mixing equipment can adjust the RAP material content from 0 to 50%, and is equipped with a heating and screening system for the recycled material, making it energy-saving and environmentally friendly.

11. Extra coarse asphalt macadam mixture: maximum aggregate size ≥37.5mm (45mm for round hole sieve), suitable for road subbase. ACE Group’s large-scale mixing equipment can be adapted to the heating and mixing of large-diameter aggregates.

12. Coarse-grained asphalt mixture: The maximum aggregate size is 26.5mm or 31.5mm (30-40mm for round hole sieve), suitable for the lower layer of the road surface. The aggregate screening system of ACE Group Equipment can accurately control the gradation.

13. Medium-grained asphalt mixture: The maximum aggregate size is 16mm or 19mm (20mm or 25mm for round hole sieve). It is suitable for the intermediate layer of the road surface and is the core structural layer material of high-grade highways.

14. Fine-grained asphalt mixture: The maximum aggregate size is 9.5mm or 13.2mm (10mm or 15mm for round hole sieve), suitable for the surface layer of road.

15. Sandy Asphalt Mixture: Maximum aggregate size ≤ 4.75mm (5mm for round hole sieve), also known as asphalt stone chips or asphalt sand, suitable for sidewalks, bicycle lanes or road seals.

III. Construction-related (Adaptation to ACE Group’s standardized construction processes)

1. Hot-mix asphalt pavement: Asphalt and aggregates are mixed at 150-180℃ and paved at 120-150℃. This is the mainstream construction technology for high-grade highways. ACE Group’s hot-mix mixing plant can precisely control the mixing temperature and paving temperature.

 2. Asphalt mixture pavement at ambient temperature: pavement made by mixing emulsified asphalt or diluted asphalt with aggregates at ambient temperature (5-35℃), which is convenient to construct and energy-saving and environmentally friendly.

3. Prime coat: To enhance the adhesion between the asphalt surface layer and the non-asphalt base layer (such as cement-stabilized crushed stone base layer), a thin, penetrating layer of emulsified asphalt, coal tar pitch, or liquid asphalt is poured onto the base layer surface, with a penetration depth ≥5mm.

4. Tack Coat: A thin layer of asphalt material applied to enhance the bond between asphalt layers and between asphalt layers and cement concrete pavement or bridge deck. The application rate is controlled between 0.3 and 0.6 kg/m².

5. Sealing Coat: A thin layer of asphalt mixture laid to seal the voids on the road surface and prevent moisture intrusion. The layer laid on the surface of the surface course is called the upper sealing coat (anti-skid, anti-aging), and the layer laid below the surface course is called the lower sealing coat (waterproof, bonding). ACE Group’s mixing equipment can produce slurry sealing coat and chip seal coat mixtures.

6. Slurry seal: The seal is formed by mixing stone chips, fillers (cement, fly ash, etc.), emulsified asphalt, admixtures and water in a certain proportion to form a fluid dynamic mixture, which is then evenly spread on the road surface. ACE Group’s slurry seal machine can achieve integrated construction.

7. Crushed stone seal: This is a seal layer formed by first spreading asphalt binder, then evenly spreading crushed stone and compacting it. It is suitable for preventive maintenance of road surfaces. ACE Group’s asphalt distributor and crushed stone spreader can work together.

8. Liquid petroleum asphalt: A product made by diluting petroleum asphalt with solvents such as gasoline, kerosene, and diesel. It is also known as light asphalt or diluted asphalt and is suitable for tack coat and primer coat construction. ACE Group equipment is compatible with its storage and metering.

9. Paving temperature: The temperature during asphalt mixture paving. The paving temperature of hot-mix asphalt mixture is ≥120℃. ACE Group pavers are equipped with a temperature monitoring system to ensure construction quality.

 10. Compaction temperature: The temperature during asphalt mixture compaction. Initial compaction temperature ≥ 110℃, final compaction temperature ≥ 70℃. ACE Group road rollers can adjust the compaction process according to temperature requirements.

11. Curing period: The time from the completion of asphalt pavement construction to the opening of traffic. The curing period for hot-mix pavement is ≥4 hours, and for normal temperature pavement it is ≥24 hours. The specific time needs to be adjusted according to the temperature and the type of mixture.

12. Recycling Construction: The process of using a milling machine to recycle old asphalt pavement material (RAP material), which is then screened, heated, and mixed with new aggregates and new asphalt to form recycled mixture for repaving the road surface. ACE Group’s recycling mixing plant can achieve efficient utilization of old materials.

13. Milling: The operation of breaking and cutting old asphalt pavement with a milling machine, recycling old materials and repairing the pavement base. ACE Group’s matching milling machine can accurately control the milling depth (0-100mm).

IV. Equipment (ACE Group’s core products and components)

1. Asphalt Mixture Mixing Equipment: Also known as asphalt mixing plant/mixing equipment, it is the core equipment for preparing road surface mixtures by heating, metering, and mixing asphalt, aggregates, powders, and additives according to the designed proportions. ACE Group’s mixing plants cover three major series: forced intermittent, continuous, and recyclable, possessing advantages such as intelligent control, high efficiency and energy saving, and environmental compliance.

2. Forced Intermittent Asphalt Mixing Equipment: Employing a “batch batching-forced mixing” mode, each batch independently completes aggregate screening, heating, metering, and mixing, enabling precise control of the mix proportions (deviation ≤ ±1%) and quality. It is the preferred equipment for high-grade highway construction. ACE Group’s equipment of this type is equipped with a PLC intelligent control system, supporting remote monitoring and data traceability.

3. Continuous Asphalt Mixing Equipment: Production equipment for continuous heating, batching, and mixing of aggregates, with high production efficiency (up to 400t/h), suitable for large-scale road engineering. ACE Group equipment is equipped with a variable frequency speed control system to achieve flexible adjustment of output.

4. Recycled Asphalt Mixture Mixing Equipment: This equipment integrates the functions of recycling, screening, heating, and mixing of recycled materials. It can add 0-50% RAP material. ACE Group ‘s equipment is equipped with a dual heating system (low-temperature heating of recycled materials + high-temperature heating of new materials) to prevent aging of recycled materials and to save energy and protect the environment.

5. Mobile asphalt mixing plant: The equipment modules can be quickly disassembled, transported, and assembled, making it suitable for temporary projects or remote construction sites. ACE Group ‘s mobile equipment has a small footprint, a short installation period (≤7 days), and performance consistent with stationary equipment.

6. Fixed Asphalt Mixing Plant: A large-scale mixing equipment fixedly installed on site, with strong production capacity (100-600t/h), suitable for long-term, large-scale projects. ACE Group ‘s fixed equipment can customize aggregate bins and asphalt tank capacity according to needs.

7. Indoor Asphalt Mixture Production Line: The mixing equipment, material yard, and loading and unloading processes are integrated into a closed workshop to achieve full-process indoor operation, effectively control dust and noise pollution, and meet environmental protection requirements. ACE Group ‘s indoor production line is equipped with a high-efficiency dust removal and sound insulation system.

8. Aggregate heating system: The core component of the asphalt mixing plant, which uses a burner to heat the aggregate to 160-190℃. ACE Group equipment is equipped with an energy-saving burner (thermal efficiency ≥92%), which supports multiple energy sources such as diesel, natural gas, and biomass fuel.

9. Asphalt Storage Tanks: Insulated containers used for storing asphalt. ACE Group ‘s storage tanks are equipped with electric heating or steam heating systems, and the insulation temperature is controlled at 130-150℃ to prevent asphalt from solidifying. The capacity ranges from 50 to 500t.

10. Powder Supply System: Composed of powder silos, screw conveyors, and weighing scales, it is responsible for the storage, transportation, and accurate metering of fillers. ACE Group ‘s system is equipped with an anti-bridging device to ensure a stable powder supply.

11. Dust Removal Equipment: To handle the dust generated during the mixing process, ACE Group ‘s equipment adopts a two-stage dust removal system of “cyclone dust collector + bag dust collector”. The dust emission concentration is ≤10mg/m³, which meets the national environmental protection standards.

12. Intelligent Control System: The PLC control system independently developed by ACE Group integrates functions such as formula management, metering control, temperature monitoring, fault alarm, and data statistics. It supports dual operation via touch screen and computer and can realize remote operation and maintenance.

13. Asphalt Sprayer Truck: A vehicle specially designed for uniformly spraying tack coat, primer, and liquid asphalt. ACE Group ‘s sprayer truck is equipped with an intelligent flow control system, with a spraying accuracy of ≤±3% and an adjustable spraying width (2～6m).

14. Paver: A specialized piece of equipment that spreads asphalt mixture evenly on the road surface. The paving thickness (0-300mm) and width (2-12m) can be adjusted. ACE Group pavers are equipped with an automatic leveling system to ensure road surface flatness (standard deviation ≤2mm/3m).

15. Road Roller: Equipment used to compact the paved mixture, achieving a specified density (≥96%) and strength through rolling. ACE Group’s road rollers include steel-drum rollers (static/vibratory) and rubber-tired rollers, which can be used in combination depending on the type of mixture.

16. Milling machine: Specialized equipment for milling and crushing old asphalt pavement. ACE Group’s milling machine is equipped with a hydraulic drive system, and the milling depth is precisely adjustable. The old material recycling rate is ≥95%.

Conclusion

Technical terminology is the foundation for technological inheritance and innovation in the asphalt mixing plant industry. Asian Construction Equipment Group Co., Ltd. consistently focuses on “standardization, intelligence, and greening,” integrating the application of standardized terminology into the entire process of equipment research and development, manufacturing, and engineering services. This article summarizes core terms covering key technical nodes in the industry, providing precise reference for engineering technicians, equipment operators, and project managers.

In the future, Asian Construction Equipment Group Co., Ltd. will continue to deepen its expertise in the asphalt mixing equipment field, continuously optimize its product technology and service system, and promote the standardization of industry terminology and technical specifications. For further information on the application scenarios of terminology in actual engineering projects, equipment selection and adaptation solutions, or customized technical services, please feel free to communicate with the Asian Construction Equipment Group Co., Ltd. technical team at any time, and work together to build high-quality asphalt pavement projects.

Note: The content of this article is for reference only.

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Standard Installation Process of Asphalt Mixing Plant

As my country’s highway infrastructure construction develops towards high quality and precision, asphalt mixing plants, as core equipment in road construction, directly affect project quality and construction efficiency through their installation accuracy and system stability. As a professional road equipment R&D and manufacturing enterprise, Asian Construction Equipment Group Co., Ltd. (abbreviated as ACE Group) has been deeply involved in the asphalt mixing plant field for many years. Based on extensive engineering experience and technological innovation, it has formulated this “Standardized Installation Technical Specification for Asphalt Mixing Plants”.This specification is for reference only. Actual installation operations require flexible adjustments based on specific project conditions (such as geological conditions, equipment model differences, and local environmental requirements). If necessary, consult the ACE Group team for customized guidance. This specification focuses on the key technical points, quality control, and safety requirements of the entire installation process. It aims to provide a scientific, standardized, and practical technical reference for the installation of various models of ACE Group asphalt mixing plants, helping to ensure that each set of equipment meets design performance indicators, providing reliable production guarantees for customers, and promoting the improvement of quality and efficiency in road construction projects.

I. General Provisions

(一) Purpose of the Procedure

As a core production equipment in road construction, the installation quality of asphalt mixing plants directly determines the production efficiency, product qualification rate, and equipment lifespan of the asphalt mixture. To standardize the entire installation process of ACE Group asphalt mixing plants, unify technical standards, clarify operational requirements, prevent safety risks, and ensure that the equipment achieves its designed capacity and environmental protection targets after installation, this procedure is hereby formulated. This procedure applies to the installation engineering of new construction, relocation, and renovation projects of all models of ACE Group asphalt mixing plants.

(二) Scope of Application

This procedure covers all stages of installation, including pre-installation preparation, main equipment installation, auxiliary system deployment, electrical integration, commissioning, and acceptance. It is applicable to ACE Group’s engineering and technical personnel, cooperating construction units, and on-site workers, serving as a technical reference for installation operations. It should be noted that safety, environmental protection, and special equipment management regulations may differ in different regions. Actual operation should prioritize compliance with current local regulations. The content of this procedure does not replace specific compliance requirements.

(三) Core Principles

Installation work must adhere to the principles of “safety first, technical compliance, precise positioning, and closed-loop management,” and strictly implement the national “Installation and Acceptance Specifications for Asphalt Concrete Mixing Equipment” and the requirements of the ACE Group Technical Manual to ensure that the installation process is safe and controllable and that the installation quality meets the standards and achieves excellence.

II. Pre-installation Preparations

（一）Site and foundation engineering

1. Site Selection and Planning: The site must be flat, with geological bearing capacity meeting equipment operation requirements, far from densely populated areas, and away from underground pipelines and areas susceptible to natural disasters. The site must be rationally planned with raw material storage areas, finished material stacking areas, equipment operation areas, and maintenance access routes to ensure smooth passage for transport vehicles and sufficient operating space for construction machinery; a complete drainage system should be installed to prevent water accumulation from eroding the foundation structure.

2. Foundation Design and Construction: Based on the equipment foundation drawings provided by ACE Group and the geological survey report, a detailed foundation design will be conducted. The strength and impermeability grade of the foundation concrete must meet the design requirements, and the size and depth of the anchor bolt pre-drilled holes must be precisely controlled. After construction, the foundation surface must be kept flat, and the curing period must meet the requirements for concrete strength development. During the curing period, it is strictly forbidden to pile heavy objects or apply external forces.

3. Foundation Acceptance: After the foundation construction is completed, load-bearing capacity testing and dimensional verification are required, and a professional test report must be issued. Special attention should be paid to checking the anchor bolt embedment positions, foundation elevation, and the verticality of reserved holes. Equipment installation can only proceed after the foundation has passed inspection.

(二) Equipment unpacking inspection and storage

1. Arrival Inspection: Upon arrival of the equipment, a joint acceptance inspection will be conducted by technical personnel from ACE Group, the supervision unit, and the construction unit. The model and quantity of the main unit, components, and spare parts will be verified against the “Equipment Packing List,” with a focus on checking the appearance integrity of easily damaged parts. Professional testing methods will be used to inspect the quality of key components to prevent hidden damage during transportation.

2. Document Verification: Verify the equipment’s factory certificate of conformity, material inspection report, electrical schematic diagram, installation manual, and other technical documents to ensure that the documents match the equipment model and that all signatures and seals are complete. Simultaneously collect relevant qualification documents and test reports for special equipment and archive them as required.

3. Equipment storage: After unpacking, the equipment should be stored according to the type of components. The main components should be protected against rain and moisture. Electrical components and seals should be stored in a dry warehouse. Metal parts should be treated to prevent rust. Precision instruments should be stored separately and protected against moisture and shock.

(三) Preparation of Tools and Materials

1. Specialized tool configuration: Equipped with lifting equipment that meets the requirements for equipment hoisting and installation, testing tools with accuracy meeting measurement standards, welding equipment adapted to equipment assembly needs, and electrical testing instruments. All tools must be metrologically calibrated and have valid labels affixed to ensure that their performance and accuracy meet the operational requirements.

2. Requirements for auxiliary materials: Anchor bolts, gaskets and other connecting parts must meet the strength grade requirements; sealant must be a temperature-resistant and oil-resistant product suitable for the equipment’s operating conditions; lubricating oil must strictly follow the model specified by ACE Group; and insulation materials must meet the requirements for thermal conductivity and protective performance.

III. Main Equipment Installation Specifications

(一) Installation of the main mixing tower

1. Base Installation: Using professional lifting equipment, the base of the mixing plant is hoisted to the designated position on the foundation and initially fixed with anchor bolts. The base is then leveled using a leveling tool. Once the level is achieved, a secondary grouting method is used to fill the gap between the base and the foundation. The strength of the grout must meet the design requirements. After the grout has reached the required strength, the anchor bolts are tightened according to the specifications.

2. Tower Assembly: Install the main tower sections in a bottom-up order, layer by layer. The flange connection surfaces of adjacent sections must be cleaned and sealed properly, and high-strength bolts must be used for fastening. After each tower section is installed, use professional instruments to measure its verticality and correct any deviations promptly to ensure the overall verticality of the tower meets design standards.

3. Mixing System Installation: Hoist the mixer to the designated location inside the main mixing building and securely fix it to the tower body using connectors. Precisely connect the mixer’s inlet, outlet, and all pipes to ensure a leak-free seal at the connections; install the mixing motor and reducer, and adjust the tension of the transmission components to ensure smooth operation of the transmission system.

(二) Drying drum installation

1. Bracket Installation: Install the appropriate bracket according to the size and weight requirements of the drying cylinder. The bracket foundation must be stable and level. Use lifting equipment to hoist the drying cylinder onto the bracket and secure it firmly with positioning pins and bolts to ensure the drying cylinder is placed stably.

2. Burner Installation: Accurately install the burner at the designated location on the drying cylinder, ensuring the installation position meets design requirements. Connect the fuel supply pipeline and control system to the burner. After installation, a rigorous sealing check must be performed to prevent fuel leakage and potential safety hazards.

3. Transmission System Debugging: Install the drive motor, reducer, and transmission components of the drying drum, and adjust the tension of the transmission device to ensure that the drying drum can rotate smoothly and steadily. Start the motor for a no-load test run to check the stability of the drying drum operation and troubleshoot any abnormal vibrations or noises.

(三) Vibrating screen installation

1. Frame Fixing: Hoist the vibrating screen frame to the designated installation location and securely fix it to the foundation using anchor bolts or welding. Use a leveling tool to adjust the frame’s levelness to ensure stable installation. A vibration damping device must be installed between the frame and the foundation to ensure the vibration reduction effect meets design requirements.

2. Screen Installation: Select and install a suitable screen according to the aggregate screening requirements. The screen must be taut, secure, and free from damage or looseness. Install the vibratory motor and adjust the angle of the motor eccentric block to achieve the required vibration frequency and amplitude, ensuring that the screening efficiency meets the standards.

IV. Installation of auxiliary equipment and pipelines

(一) Installation of the batching system

1. Silo Installation: Install various raw material silos (stone silos, powder silos, asphalt tanks, etc.) according to design specifications, ensuring that the silos are installed securely and that the spacing between each silo meets the requirements for operation and maintenance. Powder silos need to be equipped with dust collectors and arch-breaking devices, and asphalt tanks need to be equipped with heating devices and temperature control systems to ensure the silos function properly.

2. Feeding Equipment Installation: Install a suitable feeder (belt scale, screw conveyor, electromagnetic vibrating feeder, etc.) at the bottom of the silo. Adjust the discharge port position of the feeding equipment to ensure that the material can smoothly enter the next process. Connect the electrical control system of the feeding equipment to achieve precise control of the feeding rate.

(二) Installation of the conveyor system

1. Belt Conveyor Installation: Lay the belt conveyor according to the process flow, ensuring the frame is installed flat and firmly, and that the idlers and rollers meet the specifications. Adjust the belt tension to prevent belt deviation during operation; install necessary safety protection devices to ensure safe equipment operation.

2. Powder Conveying Pipeline Installation: Install various types of powder conveying pipelines. The pipeline material must meet the requirements for wear resistance and sealing. Pipeline connections must be tight, and seals must be used to prevent powder leakage. Necessary valves and elbows should be installed on the pipelines to ensure smooth powder conveying.

3. Installation of Asphalt Conveying Pipelines: Asphalt conveying pipelines must be insulated to prevent the asphalt from solidifying during transport. Specialized sealing materials must be used for pipe connections to ensure a tight seal. An asphalt pump and heating equipment must be installed to ensure the asphalt can be smoothly delivered to the mixing system.

(三) Installation of dust removal system​

1. Dust Collector Installation: Select and install a suitable dust collector based on the batching plant’s production capacity and environmental standards. The installation location should facilitate operation and maintenance, ensuring smooth connections between the dust collector’s inlet and outlet pipes. The dust collector must be linked to the control system to achieve automated adjustment of the dust removal function.

2. Ventilation duct installation: Lay ventilation ducts to effectively connect the dust collector to each dust-generating point in the mixing plant. The ventilation ducts must have sufficient strength and sealing to ensure effective dust collection; the duct layout must be reasonable to avoid sharp bends or the risk of blockage.

3. Exhaust Fan Installation: Install an exhaust fan at the end of the ventilation system. The fan’s airflow and pressure must meet the design requirements of the dust removal system. Adjust the fan’s direction and speed to ensure stable negative pressure in the ventilation system. The fan installation must be equipped with vibration damping devices to reduce operating noise.

V. Electrical System Installation and Commissioning​

(一) Installation of electrical control cabinet

1. Cabinet Fixing: The electrical control cabinet must be installed in a dry, well-ventilated control room. The cabinet must be installed vertically and level, firmly fixed to the ground, and reliably grounded. The spacing between cabinets must meet the requirements for operation and maintenance space, facilitating future maintenance.

2. Wiring Specifications: Wiring inside the control cabinet must be carried out according to the electrical schematic and wiring diagram. Wire and cable types must meet design requirements. Wiring of different voltage levels and purposes must be laid separately and clearly labeled. Terminals must be securely crimped, and wiring insulation performance must meet standards.

(二) Wiring between the motor and the sensor

1. Motor Wiring: An insulation resistance test must be performed before wiring the motor to ensure good motor performance; the wiring method must strictly follow the requirements on the motor nameplate, and protective measures must be taken for cable laying. The motor casing must be reliably grounded, and large motors must be equipped with overload protection devices.

2. Sensor Installation: Temperature, pressure, and weight sensors must be installed in designated locations to ensure accurate measurement data. Sensor wiring shielding must be effectively grounded, and signal transmission cables must be kept away from power cables to avoid signal interference. Sensors must be calibrated before installation to ensure measurement accuracy meets design requirements.

(三) Installation of grounding and lighting systems

1. Grounding System Installation: A complete grounding system shall be constructed using a combined grounding method, including grounding electrodes, grounding wires, and grounding busbars. The installation depth and material of the grounding electrodes must meet standards, the grounding wire connections must be secure and reliable, and the grounding resistance must meet safety requirements. Equipment metal casings, electrical control cabinets, motors, etc., must all be reliably grounded.

2. Lighting System Installation: Sufficient lighting fixtures shall be installed in the mixing plant’s operating area and control room. The lighting intensity must meet the needs of operation and maintenance, and the protection level of the fixtures must be appropriate for the operating environment. Lighting circuits must be laid independently and equipped with emergency lighting devices to ensure lighting needs are met in the event of a sudden power outage.

VI. Equipment Commissioning and Trial Operation

(一) No-load commissioning

1. Individual Unit Commissioning: After completing equipment installation and electrical wiring, start each unit in the order of “electrical first, then mechanical; auxiliary equipment first, then main unit”. Observe the equipment operation status, check the motor rotation, transmission component operation and lubrication effect, troubleshoot abnormal vibration or noise, and ensure that the individual unit operating parameters meet the design requirements.

2. Interlocking Debugging: After the individual machine debugging is qualified, start the entire set of equipment for interlocking no-load debugging. Simulate the actual production process, check the interlocking control functions between the equipment, verify the smoothness of the material conveying path and the accuracy of valve action, and ensure the reliability of the emergency stop function.

(二) Load Trial Operation

1. Trial Production Preparation: Prepare qualified raw materials according to the design mix ratio and check that the quality of the raw materials meets the specifications. Adjust the equipment operating parameters to ensure that all systems are in a ready state; formulate a trial production plan, clarifying the operating procedures and safety precautions.

2. Trial Production Operation: Gradually increase the input of raw materials and carry out trial production operations according to plan. Monitor the equipment operating status in real time, record key operating parameters (temperature, pressure, output, etc.), and check the equipment sealing performance and wear condition; conduct quality testing on the produced asphalt mixture to ensure that the product quality meets the standards.

3. Problem rectification: Problems discovered during the trial operation (such as material leakage, abnormal noise, parameter deviation, etc.) will be addressed by the technical personnel of ACE Group, who will lead the development of rectification plans, complete the rectification within a specified time limit, and retest until the problem is completely resolved.

VII. Acceptance and Delivery

(一) Acceptance Standards and Contents

1. Installation quality acceptance: In accordance with this procedure and relevant national standards, check the installation accuracy (levelness, verticality, concentricity, etc.), the firmness and sealing performance of the connection parts, and verify the standardization of electrical wiring and the integrity of the equipment appearance.

2. Performance index acceptance: Test the equipment’s production capacity, product quality pass rate and energy consumption level, check whether environmental protection indicators (dust emissions, noise, etc.) meet the requirements, and ensure that the overall performance of the equipment meets the design standards.

3. Document Acceptance: Verify the technical documents required for acceptance (equipment unpacking and acceptance record, foundation inspection report, installation and construction record, commissioning report, raw material certificate of conformity, etc.) to ensure that the documents are complete, the data is accurate, and they meet the archiving requirements.

(二) Preparation of Acceptance Report

After acceptance, the Asphalt Mixing Plant Installation Acceptance Report shall be jointly prepared by ACE Group, the construction unit, and the supervision unit, which shall specify the acceptance content, acceptance method, acceptance results and rectification status, and attach supporting materials such as equipment photos and test reports, and shall be signed and confirmed by the participating units.

(三) Delivery and Training

1. Equipment delivery: After acceptance is completed and all issues are rectified, the equipment handover procedures will be completed, and the equipment technical data (installation manual, operation manual, maintenance manual, spare parts list, etc.) and acceptance report will be handed over to the user. Both parties will sign the delivery confirmation document.

2. Personnel Training: ACE Group’s technical personnel conduct systematic training for user operators and maintenance personnel, including equipment structure and principles, operating procedures, troubleshooting methods, and key points of daily maintenance. After the training, an assessment is conducted to ensure that relevant personnel have the ability to operate and maintain the equipment independently.

VIII. Supplementary Provisions​

1. This specification is subject to interpretation and revision by the Engineering and Technology Department of Asian Construction Equipment Group Co., Ltd.. Any matters not covered herein shall be handled in accordance with current national standards and equipment technical manuals. The content of this specification is for reference only and will be updated to reflect industry technological developments and engineering practices during revision.

2. Installation work must strictly adhere to safe operating procedures. The construction unit must provide complete safety protection facilities, and all personnel must be certified and comply with safety management regulations. These safety requirements are for reference only; actual requirements must comply with national work safety regulations and the project’s specific safety plan.

3. After the equipment is installed, a regular maintenance plan should be developed and maintenance work should be carried out as required. The specific maintenance requirements should be in accordance with the “Maintenance and Maintenance Procedures for Asphalt Mixing Plants” of ACE Group.

IX. Conclusion

This “Standardized Installation Technical Specification for Asphalt Mixing Plants of ACE Group” is a concentrated reflection of Asian Construction Equipment Group Co., Ltd. technical strength and engineering experience. Its content is for reference only and does not constitute a final technical commitment or legal basis. The core value of this specification lies in providing a standardized and detailed reference framework for installation operations and offering full-cycle technical support for equipment installation quality. In practical application, relevant units should flexibly adjust the specifications according to the specific circumstances of the project (such as geological conditions, equipment models, local regulations, etc.), strictly adhere to current national standards and regulations, strengthen process control, pay attention to details, and ensure the safety and compliance of every procedure.In the future, Asian Construction Equipment Group Co., Ltd. will continue to track industry technology development and engineering practice needs, dynamically optimize and upgrade this specification, provide customers with more targeted technical references, and help my country’s road construction industry achieve high-quality development.

Important Note: All operational requirements and technical specifications in this procedure are for reference only. Actual implementation should be based on the specific circumstances of the project and the guidance of professional technicians. Asia Construction Technology Co., Ltd. shall not be liable for any losses caused by directly applying this procedure.