With the continuous upgrading of fire safety requirements for mine vehicles by the National Mine Safety Administration and the in-depth advancement of "Smart Mine" construction, fire prevention for engineering vehicles has become one of the core issues in mine safety production. Data shows that in recent years, engine compartments, hydraulic oil lines, and electrical wiring account for over 60% of fire accidents in mine vehicles. Traditional handheld fire extinguishers have notable shortcomings such as delayed response, limited coverage, and high manual operation risks. To address this, the gmfire Mine Vehicle Fire Suppression System, using a water-based agent as its core medium and leveraging intelligent detection and precision spray technology, achieves all-round protection for mine equipment such as loaders, wide-body dump trucks, and LHDs.

1. Water-Based Agent: Dual-Action Fire Extinguishing Principle with Rapid Cooling

The reason why the Mine Vehicle Fire Suppression System has gained wide application in the mining industry is largely due to the excellent performance of the water-based extinguishing agent. The water-based agent consists of water, fluorocarbon surfactants, and flame retardant additives. When discharged, it forms a fine water mist with an average droplet diameter of approximately 80 microns. The droplets have a large specific surface area and high latent heat of vaporization, allowing them to absorb a large amount of heat in a very short time. Through the physical cooling effect of vaporization, they rapidly lower the fire zone temperature, reducing the temperature of the combustion zone below the auto-ignition point of diesel fuel within two seconds. At the same time, the water-based agent forms and spreads a thin water film on the surface of combustible materials, effectively isolating the oxygen needed for combustion, reducing the oxygen concentration in the combustion zone, and achieving the dual fire-extinguishing effect of flame suffocation.

Furthermore, the water-based agent combines physical and chemical fire extinguishing properties. It not only quickly puts out open flames but also effectively suppresses re-ignition. Its good electrical insulation and corrosion resistance make it safe and reliable in areas dense with electrical equipment such as engine compartments, distribution boxes, and battery boxes. Compared with dry powder extinguishing agents, the water-based agent leaves no residue after extinguishing a fire, requires no secondary cleaning, causes no corrosion or damage to vehicles or equipment, does not pollute underground air, is harmless to the human body, and can easily withstand extreme weather conditions in both the north and south. Currently, automatic fire suppression systems equipped with water-based agents have been widely used in mine vehicles in Xinjiang, Inner Mongolia, Shaanxi, Shanxi, and other regions, making them an ideal choice for mine vehicle fire protection.

2. Precision Protection for Loaders: Closed-Loop Prevention and Control from Intelligent Detection to Directed Spray

As the main workhorses of mining operations, loaders operate for long periods under harsh conditions such as high temperature, high dust, and high vibration. Aging oil lines and electrical circuits in the engine compartment can easily cause fires, while traditional firefighting methods often fail to respond quickly in the initial stage of a fire. The water-based automatic fire suppression system uses distributed fire source detectors installed in flammable areas such as the loader's engine compartment, hydraulic oil tank, and battery pack to monitor multiple spaces simultaneously with a low false alarm rate. The system can choose between mechanical temperature-sensing detection or electronic fire detection modes. The detectors continuously transmit temperature change signals to the control unit for analysis and processing. Once a fire is confirmed, the controller immediately activates an audible and visual alarm and automatically opens the actuation valve. The water-based agent is then precisely discharged to the ignition point through dedicated piping and spray nozzles, achieving second-level response and directed spray.

It is worth noting that, considering the structural characteristics and protected space volume differences of various loader models, the system can be custom-designed based on factors such as engine compartment size and heat source distribution. The agent quantity, number of nozzles, and detector locations are configured differently to ensure 24/7 fire monitoring and automatic fire suppression whether the loader is in operation or unattended. The entire system can be equipped with a mechanically actuated, non-electric, non-pressurized starting method, completely eliminating the safety concerns of energization in underground coal mines. This makes it particularly suitable for underground explosion-proof loaders where the risk of gas and coal dust explosions is high. The closed-loop prevention and control mechanism, from fire detection to agent discharge, ensures that loaders receive accurate and reliable fire safety protection even under complex operating conditions.

3. All-Round Protection: Intelligent Safety Upgrades for Mine Equipment

From off-highway mining dump trucks to underground explosion-proof trackless rubber-tired vehicles, from monorails to drill jumbos, the Mine Vehicle Fire Suppression System has achieved all-round coverage and protection for a wide variety of mine equipment. The system consists of four main modules: fire source detectors, a control unit, an audible and visual alarm device, and a spray device. Detectors are installed in critical areas prone to high temperatures or fire sources, such as the engine compartment, near the fuel tank, around the battery pack, and under the cargo box, covering mine vehicles with various power sources including diesel, electric, and hybrid. When an abnormal temperature rise is detected, the system activates automatically. The time from detection to activation is extremely short, allowing the system to quickly suppress the fire in its initial stage and prevent it from spreading. For electric mining dump trucks, triggering the fire detection device can automatically disconnect the high-voltage circuit while simultaneously emitting a continuous audible and visual alarm in the driver's cab, achieving integrated protection of fire warning and power cut-off.

In recent years, the integration of remote control and IoT technology has further enhanced the intelligence level of fire protection for mine equipment. The new generation of automatic fire suppression systems for mine vehicles features millisecond-level response and remote, zero-delay precise discharge capability. Managers can remotely view the operating status of mine vehicles via mobile phones or computers, receive fire warnings in a timely manner, and make emergency responses, truly achieving "around-the-clock, no-blind-spot" fire warning and prevention. At the same time, the system supports integration with the mine's centralized control platform, enabling real-time reporting of fire information, providing data-driven and traceable decision-making basis for mine safety management.

4. Conclusion

With the official implementation of the national standard "Safety requirements for fire extinguishing systems on mining vehicles" (GB/T 45752-2025) on December 1, 2025, the performance requirements and safety specifications for mine vehicle fire suppression systems have been further clarified, providing a unified technical framework and market access threshold for the industry. Driven by both this policy impetus and technological innovation, the Mine Vehicle Fire Suppression System is rapidly evolving towards intelligence, precision, and unmanned operation. The water-based agent, with its comprehensive advantages of rapid cooling, environmental friendliness, and re-ignition suppression, has become the mainstream extinguishing agent for mine vehicle fire protection. Key equipment like loaders, through the deep integration of customized design and intelligent detection technology, achieves the precision prevention goal of early detection, early warning, and early disposal of fires. From single-equipment protection to full-site coverage in mines, the Mine Vehicle Fire Suppression System is building the first line of defense for mine fire safety with cutting-edge technology, providing a solid and reliable safety guarantee for the construction of "Smart Mines."