1. Products related to safe production used in coal mines must obtain the safety mark for coal mine products. Products that have not obtained the safety mark for coal mine products shall not be used.
2. Ordinary portable electrical measuring instruments must be used in places where the gas concentration is less than 1%, and the gas concentration of the use environment must be monitored in real time.
3. Full-time explosion-proof inspectors must undergo training and examinations by the superior competent department and obtain a certificate of qualification. Part-time explosion-proof inspectors must undergo mine-level training and examinations and obtain a certificate of qualification.
4. Before entering the mine, explosion-proof electrical equipment must be checked by full-time explosion-proof inspectors for its “product certificate”, “explosion-proof certificate”, “safety mark for coal mine products” and safety performance; only after the inspection is qualified and the certificate is issued, it is allowed to enter the mine.
5. Explosion-proof electrical products for industrial trial operation must have an “industrial production license” issued by the quality supervision and inspection department. The user unit must formulate safety measures and be reviewed and approved by the deputy general manager of mine electromechanical, otherwise it will not be allowed to enter the mine.
6. When underground explosion-proof electrical equipment changes its rated value and undergoes technical transformation, it must be inspected by the national authorized mining product quality supervision and inspection department.
7. The operation, maintenance and repair of underground explosion-proof electrical equipment must comply with the various technical requirements of explosion-proof performance.
8. Electrical equipment with damaged explosion-proof performance must be handled or replaced immediately and is strictly prohibited from continued use.
9. The maintenance of explosion-proof housings shall comply with the “Regulations for Repair of Housings of Explosion-proof Electrical Equipment in Coal Mines”, and must be repaired by units or manufacturers with explosion-proof maintenance qualifications.
10. Explosion-proof electrical maintenance workers (part-time explosion-proof inspectors) shall inspect the explosion-proof electrical equipment under their jurisdiction at least once per shift.
11. Full-time explosion-proof inspectors shall inspect the explosion-proof electrical equipment in high-gas mines or high-gas areas of low-gas mines at least twice a week. The explosion-proof electrical equipment in low-gas mines shall be inspected at least once a week.
12. The staffing of full-time and part-time explosion-proof inspectors must meet the needs of explosion-proof inspection work.
13. The voltage level of the cables of explosion-proof electrical equipment (including small electrical appliances) shall not be higher than the nominal voltage level, otherwise it shall be deemed as explosion failure.
14. If the 9# terminal of the explosion-proof magnetic switch used in high-gas, coal and gas outburst mines is grounded or the explosion-proof casing is energized for some reason, it shall be deemed as explosion failure.
15. The use of switches to control the power line in and out of the incoming device shall be deemed as explosion failure (but the leakage detection relay and the control circuit power supply are excluded).
16. All explosion-proof electrical equipment shall be managed according to explosion-proof requirements regardless of where it is used underground.
17. If the casing has cracks, open welding, or severe deformation (the deformation length exceeds 50mm, and the convex and concave depth exceeds 5mm), it shall be deemed as explosion failure.
18. If the rust on the inside and outside of the explosion-proof casing falls off (the thickness of the rust is 0.2mm or more), it shall be deemed as explosion failure.
19. If the transparent plate of the observation hole (window) of the explosion-proof room (cavity) is loose, broken, or ordinary glass is used, it shall be deemed as explosion failure.
20. If the explosion-proof cavity of the explosion-proof equipment is directly connected, the explosion-proof insulation seat in the explosion-proof equipment junction box is removed; the terminal and the insulation seat tube are burned, so that the two cavities are connected, it is a failure.
21. If the locking device is incomplete, deformed and damaged and cannot play a locking role, it is a failure.
22. The minimum effective length of the explosion-proof joint surface of the quick-acting door type shall not be less than 25mm, otherwise it is a failure.
23. The average roughness of the explosion-proof joint surface shall not be higher than 6.3μm, otherwise it is a failure.
24. There is no rust on the explosion-proof surface (after wiping with cotton yarn, there are still rust marks, which is rust, and only cloud shadows are left, which is not considered rust), otherwise it is a failure.
25. Bolts and spring washers must be complete and tightened (the degree of tightening is qualified when the washers are flattened), otherwise it is a failure.
26. The specifications of the spring washers must be compatible with the bolts. (When individual spring washers occasionally break or lose elasticity, check the explosion-proof gap at that location. If it does not exceed the limit, replace the qualified spring washers and it will not be explosion failure), otherwise it will be explosion failure.
27. Bolts or screw holes cannot be slipped (except for those that are tightened by bolts of the same diameter and nuts), otherwise it will be explosion failure.
28. The matching of bolts and impermeable screw holes. After tightening, the remaining axial length of the threads on the bolts and screw holes should be greater than 2 times the thickness of the spring washers; if the thickness around and at the bottom of the screw holes is greater than 3mm, it will be explosion failure.
29. The specifications of bolts and nuts in the same part should be consistent. The depth of the steel fastening bolt screwed into the nut cannot be less than the bolt diameter, otherwise it will be explosion failure.
30. The length of the deep-hole steel fastening bolt inserted into the screw hole should be greater than the diameter of the bolt, and cast iron, copper, and aluminum parts should not be less than 1.5 times the diameter of the bolt; if the screw hole depth is not enough, it must be filled, otherwise it will be explosion failure.
Post time: Jul-31-2024
