#acemachine

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.