With the high-quality development of infrastructure construction in my country, asphalt mixing plants, as the core production unit of road engineering, are directly related to project progress, personnel well-being, and the ecological environment through their safe operation. Asian Construction Equipment Group Co., Ltd. (abbreviated as ACE Group) has been deeply involved in the R&D of asphalt mixing equipment, intelligent operation and maintenance, and safety management services for many years, gaining profound insights into industry pain points: high-temperature and high-pressure operating environments, the characteristics of multi-media collaborative production, and the requirements for continuous operation, making safety risk prevention and control a core issue in the industry. In recent years, safety accidents in some projects caused by inadequate safety management systems and outdated technology and equipment have not only resulted in economic losses but also hindered the sustainable development of the industry. Therefore,This article, based on the engineering practice of Asian Construction Equipment Group Co., Ltd., systematically analyzes the key influencing factors of safe production in asphalt mixing plants, and constructs a full-process safety management solution, providing practical reference for the high-quality development of the industry.
1.1 Core Production Characteristics
An asphalt mixing plant is essentially an intelligent production system with precise multi-component proportioning and high-temperature closed-loop processing. Its core characteristics are:
1. High-Temperature and High-Pressure Operating Conditions: The mixture heating temperature is maintained at 150-180℃. Key components such as the mixing bins and conveying pipelines operate under high pressure for extended periods, placing extremely high demands on the equipment’s heat resistance and sealing performance.
2. Multi-Media Collaborative Operation: It involves multiple materials such as aggregates, asphalt, modifiers, and powders, with significant differences in their physical states (solid, liquid, gaseous), requiring precise control of mixing ratios and reaction conditions.
3. Continuous intelligent production: Relying on an automated control system, it can operate continuously 24 hours a day. The equipment is highly interconnected, and a failure in any link may cause the entire production line to stop.
1.2 Key Safety Risks
Based on safety assessment data from over a thousand projects by ACE Group’s, the core risks are concentrated in five categories:
1. Fire and Explosion Risks: Asphalt volatile gases and powder dust can easily form explosive mixtures in high-temperature environments, potentially causing accidents upon contact with open flames or static sparks;
2. Mechanical Injury Risks: High-speed rotating components such as screw conveyors and mixing blades can easily cause pinching, shearing, and other injuries if protective devices are missing or improper operation is performed;
3. High-Temperature Contact Injuries: High-temperature material conveying and equipment surface heat dissipation can easily lead to burns to operators, especially at critical workstations such as feed inlets and discharge outlets;
4. Dust and chemical hazards: Particulate matter generated during aggregate crushing and powder conveying, as well as harmful chemicals in asphalt and additives, can easily lead to occupational disease risks and pollute the environment.
5. System linkage failure risks: Malfunction of automated control systems, equipment aging, or improper maintenance may lead to chain reactions such as material leakage and conveying blockage.
2.1 Human Factors: The Core Variable in Safety Management
ACE Group’s practice shows that over 80% of safety accidents are directly related to human factors:
1. Insufficient skills and experience: Operators lack proficiency in operating intelligent equipment (such as PLC control systems and intelligent monitoring terminals) and have weak emergency response capabilities;
2. Weak safety awareness: There are violations of operating procedures (such as not wearing protective equipment as required, and unauthorized changes to process parameters), and insufficient vigilance regarding hidden risks (such as pipeline corrosion and circuit aging);
3. Lack of a management system: There is a lack of targeted safety operating procedures, pre-job training mechanisms, and accountability systems, resulting in safety management becoming a mere formality.
2.2 Equipment Factors: The Hardware Foundation for Safety Assurance
As the core carrier of production, the reliability of equipment directly determines the safety baseline:
1. Equipment Aging and Technological Lagging: Some older equipment lacks intelligent monitoring modules, and key components (such as safety valves and temperature sensors) experience performance degradation after long-term use, easily leading to malfunctions;
2. Inadequate Operation and Maintenance Management: There is a lack of a full lifecycle operation and maintenance plan, and daily inspections are superficial, failing to form a closed-loop management system of “monitoring-early warning-repair-acceptance”;
3. Insufficient safety equipment: Some equipment lacks key safety facilities such as emergency shutdown systems, intelligent fire and explosion prevention devices, and online dust monitoring equipment, or these facilities are malfunctioning.
2.3 Environmental Factors: External Support for Safe Operation
The production environment has a significant impact on safety risk prevention and control:
1. Temperature and Humidity: High temperature and humidity environments can easily lead to short circuits in electrical systems and corrosion of metal parts in equipment. Extreme low temperatures may affect the fluidity of asphalt, causing conveying failures.
2. Ventilation and Dust Removal Conditions: Poor ventilation in enclosed spaces can lead to excessive dust concentrations and the accumulation of harmful gases, increasing health risks and explosion hazards.
3. Adaptability of the Working Environment: Insufficient lighting and unreasonable site layout (such as disorderly material stacking and blocked emergency passages) can easily lead to misoperation and delays in emergency response.
Based on the concept of “technology empowerment + management closed loop”, ACE Group’s has built a four-dimensional safety management system of “personnel-equipment-environment-management”, which has been implemented and verified in many key projects across the country, reducing the accident rate by more than 85%.
3.1 Personnel Safety Capability Enhancement System
1. Customized Training Empowerment: Develop a three-in-one training curriculum integrating theory, practice, and intelligent simulation, covering equipment operation procedures, risk identification techniques, and intelligent system applications. Provide comprehensive pre-job training for new employees and quarterly rotational training for experienced employees.
2. Scenario-Based Emergency Drills: Conduct at least two realistic emergency drills annually, based on typical accident cases (such as fires and material leaks), using ACE Group’s independently developed emergency response simulation system to enhance employees’ collaborative response capabilities.
3. Full-cycle assessment mechanism: Establish an assessment system of “theoretical examination + practical assessment + job competency evaluation”, and link the assessment results with job promotion and salary to ensure that 100% of operators are certified to work.
3.2 Equipment Life-cycle Safety Management
1. Intelligent Operation and Maintenance System Construction: Relying on ACE Group’s AIoT equipment monitoring platform, 12 key data points, including equipment temperature, pressure, and vibration, are collected in real time. Fault early warning is achieved through algorithm models (early warning accuracy reaches 92%), generating customized maintenance plans.
2. Technical Equipment Upgrade and Iteration: Advanced equipment such as intelligent fire and explosion prevention systems (including automatic temperature alarms and nitrogen fire extinguishing devices), infrared thermal imaging monitors, and automatic emergency shutdown systems are promoted and applied, achieving a 100% upgrade and renovation rate for old equipment.
3. Standardized maintenance process: Develop the “Asphalt Mixing Plant Equipment Safety Maintenance Manual”, which clarifies the core indicators for daily, weekly, monthly and annual inspections. Implement a “must be replaced when due” system for key components (such as mixing blades and conveying pipelines) to ensure that the equipment integrity rate remains above 98%.
3.3 Environmental Safety Optimization Plan
1. Intelligent Environmental Control System: Equipped with ACE Group’s high-efficiency integrated dust removal and ventilation equipment, the system monitors dust concentration in real time and automatically adjusts airflow to ensure that the dust concentration in the working environment is below the national standard limit;
2. Precise Temperature and Humidity Control: Utilizing an intelligent temperature control system, the system links air conditioning and dehumidification equipment to maintain the production workshop temperature at 18-28℃ and humidity at 40%-60%, preventing equipment malfunctions caused by environmental factors;
3. Standardized work environment layout: Standardize material storage areas, divide personnel and vehicle access channels, equip with explosion-proof lighting equipment (illuminance ≥300lx), and set up emergency passage signs and safety warning signs to ensure a safe and orderly work environment.
3.4 Full-Process Safety Management Mechanism
1. Systematized System Construction: Sixteen core systems have been established, including the “Safety Production Responsibility System,” “Intelligent Equipment Operation Procedures,” and “Emergency Response Plan,” clearly defining the safety responsibilities of each position and achieving “one responsibility per position, full coverage of all personnel.”
2. Routine Supervision and Inspection: A three-dimensional supervision mechanism of “daily patrols + special inspections + third-party evaluations” has been established. The ACE Group’s Safety Management APP is used to record hidden dangers in real time and track rectification, achieving a 100% rectification closure rate.
3. Accident Tracing and Improvement: A closed-loop mechanism of “accident investigation – cause analysis – responsibility determination – measure optimization” has been constructed. Case studies are used to conduct company-wide warning education, continuously optimizing the safety management system.
Safety management of asphalt mixing plants is a collaborative project involving technology, management, and personnel capabilities. ACE Group’s consistently adheres to the principles of “safety first, prevention foremost, technology empowerment, and closed-loop management.” By constructing a personnel capability enhancement system, an intelligent equipment operation and maintenance system, an environmental optimization and control system, and a full-process management mechanism, it achieves precise prevention and efficient handling of safety risks. In the future, ACE Group’s will continue to deepen the application of cutting-edge technologies such as intelligent monitoring and digital twins in safety production, launching more targeted safety solutions to help the industry achieve “safe, efficient, and green” development and safeguard the high-quality advancement of my country’s infrastructure construction.
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