The underground of a coal mine is a typical high-risk explosive environment. The presence of flammable and explosive substances such as gas and coal dust imposes mandatory requirements on the explosion-proof performance of mining equipment.
Explosion-proof technology, as the core core technology support for mining equipment (such as rail-guiding vehicles, alarm devices, electronic control hosts, etc.), directly determines the life safety of underground workers and the continuity of mining production. It is the core control point in the research, production and export process of mining equipment.
The mainstream explosion-proof technologies for mining equipment are mainly divided into two categories: flameproof type and intrinsically safe type. They need to be combined and applied according to the equipment usage scenarios.
The flameproof technology uses a special enclosure structure design to seal the components inside the equipment that may generate sparks and high temperatures.
Even if an explosion occurs inside, the enclosure can withstand the explosion pressure and prevent the flame from spreading outward, suitable for high-power equipment such as motors and switches;
the intrinsically safe technology limits the current and voltage in the circuit to ensure that the equipment will not generate enough energy to ignite flammable and explosive substances in both normal and faulty states, and is widely used in sensors, monitoring terminals and other precision electronic equipment.
Explosion-proof certification is a necessary prerequisite for the compliance of mining equipment to enter the domestic market and for export. In the domestic market, it is required to obtain the national safety mark certification for mining products (MA certification) to ensure that the equipment's explosion-proof performance complies with national standards such as GB 3836;
for export products, it is necessary to obtain authoritative explosion-proof certifications such as ATEX (EU), IECEx (international standard), and UL (USA) in accordance with the requirements of the importing country. The certification process must cover all aspects from product design, production to testing, and none of them can be omitted.
In addition, the daily maintenance and inspection of explosion-proof equipment are equally crucial. Underground equipment is exposed to humid, dusty and highly-vibrating conditions for a long time, which can lead to issues such as wear on the explosion-proof surfaces and aging of sealing components.
Therefore, regular inspections of explosion-proof performance are necessary, and faults should be promptly repaired. Enterprises should strengthen the precision control of explosion-proof structures during the production process and provide professional explosion-proof maintenance guidance during the after-sales process to ensure the long-term safe and stable operation of the equipment.
