The automatic fire extinguishing device/system for open-pit mining cars is becoming a key tool for solving the fire problems of open-pit mining vehicles such as dump trucks, mining trucks, loaders, and loaders, with the innovative advantages of "early detection of fires and fast extinguishing". Under the traditional fire protection mode, the lag of manual inspection and the limitations of handheld fire extinguishers often lead to mining truck fires evolving from initial hidden dangers to major accidents. Cases of equipment damage, production stagnation, and even personnel casualties are not uncommon, and technological bottlenecks urgently need to be overcome. The system has achieved an intelligent upgrade in fire warning and disposal by integrating high-sensitivity fire detection, intelligent temperature sensing self starting, and comprehensive atomization fine spraying technology. It has moved the prevention and control checkpoint to the early stage of fire, and built an efficient and reliable intelligent defense line for the safety production of open-pit mines.

1、 Fire hazards of open-pit mining trucks and bottlenecks of traditional fire extinguishing techniques

Open pit mining trucks operate in harsh environments for a long time, and parts such as the engine compartment, hydraulic oil tank, and electrical cabinet are prone to fires due to high temperatures, wear and tear. For example, prolonged high load operation of the engine may cause aging and rupture of the fuel lines, and leaked fuel may catch fire when encountering high-temperature components. In addition, open-pit mines have high dust concentrations, and sparks generated by electrical equipment short circuits are also highly likely to cause fires.

The traditional fire extinguishing technology for coal mine vehicles mainly relies on manual inspection and handheld fire extinguishers, which have obvious limitations. Manual inspection cannot achieve real-time and comprehensive fire monitoring, often only being detected after a period of time, missing the best opportunity to extinguish the fire. However, handheld fire extinguishers have low extinguishing efficiency when facing large fires, making it difficult to effectively control the spread of the fire.

2、 In depth analysis of the core technology of the system

1. High sensitivity fire detection

The fire detection of this system is like a pair of constantly alert "electronic eyes", using advanced temperature, smoke, and flame detection composite technology. Its temperature sensing element is extremely sensitive to temperature changes and can capture even the slightest abnormal temperature rise in key areas such as the engine compartment and distribution box. For example, when the temperature in the protected area is abnormal or rises abnormally, it can detect it in a very short time. And smoke sensing technology relies on highly sensitive smoke sensors. Once smoke particles enter the detection range, even if the concentration is as low as 0.01mg/m ³, they can be quickly detected. The flame detection module utilizes ultraviolet and infrared sensors to quickly identify the special spectral signals of flames, even the faint flicker of flames cannot escape its "magic eye". Compared to traditional single detection methods, this composite detection technology greatly improves the accuracy and timeliness of fire detection, effectively reduces false alarm rates, and advances the detection time of fire hazards by several minutes or even more, buying valuable "golden time" for subsequent firefighting operations.

2. Intelligent temperature sensing self start

The intelligent temperature sensing self starting technology is the "intelligent brain" of the system, which abandons the traditional fire extinguishing system that relies on manual triggering or complex electrical control to start. The system is equipped with multiple temperature sensitive activation devices with different temperature thresholds. When the detected temperature reaches the preset activation temperature, these devices will automatically activate the fire extinguishing system as if the "start button" has been pressed through a purely mechanical linkage structure. This self starting method not only eliminates dependence on external power sources and complex electrical components, but also works stably and reliably in harsh electromagnetic interference, unstable power supply, and other environments in mines. It greatly improves the response speed of the fire extinguishing system, truly realizing the principle of "fire situation is command, instant response", allowing fire extinguishing actions to be carried out in the first time and effectively curbing the spread of fires in the early stages.

3. Global atomization fine spray

Global atomization fine spraying technology is a powerful weapon for firefighting operations. The fine spray nozzle equipped in the system is specially designed to spray the fire extinguishing agent in the form of extremely fine droplets. These tiny droplets have a large specific surface area and can quickly come into full contact with the air and combustibles around the fire source, greatly improving the efficiency of fire extinguishing. At the same time, the layout of the nozzles has been accurately calculated and optimized, achieving all-round and blind spot free spray coverage based on the fire risk and spatial structure of different parts of the mining car. Whether it is narrow engine gaps or large fuel tank surfaces, they can be accurately "hit" by fire extinguishing agents. For example, in the engine compartment, the nozzles will be arranged in a staggered manner at multiple angles to ensure that the fire extinguishing agent can penetrate into every corner, providing comprehensive protection for ignition prone areas such as the engine, oil pipes, and wiring. Moreover, the global atomization spray method can effectively reduce the amount of fire extinguishing agent used, while ensuring the fire extinguishing effect, reducing secondary damage to equipment and environmental pollution, and achieving maximum fire extinguishing effect at the minimum cost.

Secondly, in terms of application expansion, the automatic fire extinguishing system for open-pit mining cars will not be limited to existing mining dump trucks, mining trucks, loaders, and loaders, but will gradually be extended to other equipment in mines, such as coal mining machines, shield tunneling machines, rollers, and air compressors, providing comprehensive fire protection for the safety production of the entire mine. At the same time, with the increasingly widespread application of new energy technology in the mining field, automatic fire extinguishing systems for new energy mining vehicles will continue to be developed and improved to meet their unique fire safety needs and safeguard the safe operation of new energy mining vehicles.