1. In order to further implement the "Coal Mine Safety Regulations" and the standards and regulations related to explosion-proof electricity, improve the mechanical and electrical workers' understanding of explosion-proof electrical performance, and facilitate the mastery of application standards in practical work, thus strengthening the scientific management of explosion-proof electricity in coal mines, improving maintenance quality, eliminating electrical explosion and realizing the safe operation of electrical equipment, these detailed rules are formulated.
2. The selection of all underground electrical equipment (including small electrical equipment) must meet the requirements of Article 444 and Article 7 of the Coal Mine Safety Regulations.
3. Full-time explosion-proof inspectors must go through the training and examination of the higher authorities and obtain the certificate of approval. Part-time explosion-proof personnel must undergo mine-level training and assessment and obtain certificates.
4 explosion-proof electrical equipment must be inspected by full-time explosion-proof inspectors for its "product certificate", "explosion-proof certificate", "coal mine product safety sign" and safety performance before entering the well; Only after passing the inspection and issuing a certificate can you enter the well. Explosion-proof electrical products for industrial trial operation must have an "industrial test license" issued by the quality supervision and inspection department. Users should formulate safety measures and get approval from the vice president of mining machinery and electricity, otherwise they are not allowed to go down the well.
5. When changing the rating of underground explosion-proof electrical equipment and carrying out technical transformation, it must be inspected by the state-authorized mine product quality supervision and inspection department.
6. The operation, maintenance and overhaul of underground explosion-proof electrical equipment must meet the technical requirements of explosion-proof performance. Electrical equipment with damaged explosion-proof performance must be treated or replaced immediately, and it is strictly forbidden to continue to use it.
7. The maintenance of explosion-proof enclosure shall be carried out in accordance with the Maintenance Rules for Enclosures of Explosion-proof Electrical Equipment in Coal Mines, and must be carried out by units or manufacturers that have obtained the qualification of explosion-proof inspection.
8. Strengthen the inspection of underground explosion-proof electrical performance;
1) Explosion-proof electrical repairman (part-time explosion-proof inspector) shall check the explosion-proof electricity under his jurisdiction at least once per shift.
2) Full-time explosion-proof inspectors shall check the explosion-proof electricity consumption in high-gas mine or low-gas mine at least twice a week. Check the explosion-proof electricity of low gas mine once a week.
3) Full-time and part-time explosion-proof inspectors must meet the needs of explosion-proof inspection.
Second, the general provisions:
1. The voltage level of explosion-proof electrical equipment (including small appliances) and cables shall not be higher than their nominal voltage level, otherwise it will be regarded as an explosion fault.
2. If the 9 # terminal of the explosion-proof magnetic switch used in mines with high gas, coal and gas outburst is grounded for some reason or the explosion-proof shell is charged, it will be regarded as a loss of explosion.
3. The switch is used to control the incoming equipment to enter and exit the power cord, which is regarded as misfire (except for the incoming and outgoing leak detection relay and the control loop power supply).
4. All explosion-proof electrical equipment, no matter where it is used underground, should be managed according to explosion-proof requirements.
Three, flameproof shell must have obvious explosion-proof signs, coal safety signs. One of the following circumstances is lost explosion:
1. The shell is cracked, welded and severely deformed (the deformation length exceeds 50mm and the concave-convex depth exceeds 5mm).
2. There is rust falling off inside and outside the explosion-proof shell (the thickness of rust reaches more than 0.2mm).
3. The transparent plate of the observation hole (window) of the flame-proof room (cavity) is loose, damaged or made of ordinary glass.
4. The flameproof cavity of flameproof equipment is directly connected, and the flameproof insulation seat in the junction box of flameproof equipment is removed.
5. The locking device is incomplete, and the deformation and damage can't play a locking role.
Four, the flame-proof surface should be kept smooth and complete, and rust prevention measures should be taken.
1. The structural parameters of the flameproof joint surface shall meet the following requirements, otherwise it shall be regarded as misfire:
1) The maximum clearance between the static part of electrical equipment, the explosion-proof joint surface of joystick and shaft, the explosion-proof joint surface with bearing rotating shaft and the corresponding shell volume must comply with the provisions in Table 1. The minimum effective length of flame-proof joint surface of quick-acting door is not less than 25mm.
2) The average roughness of flameproof joint surface should not be higher than 6.3 microns. ..
3) There is no rust on the flame-proof surface (after rubbing with cotton yarn, those who still have rust spots are rust, leaving only clouds, not rust).
4) Flameproof surface fastened with bolts:
① Bolts and spring washers must be completely fastened (the fastening degree shall be subject to flattening washers).
(2) The specification of the spring washer should be suitable for the bolt (occasionally, when individual spring washers break or lose elasticity, check the explosion-proof gap there. If it does not exceed the limit, replacing qualified spring washers is not a loss of explosion).
(3) Bolts or screw holes shall not slip (except for replacing long bolts with nuts with the same diameter).
④ The axial length of the remaining threads on the bolt and screw hole should be greater than 1.5 times the thickness of the spring washer; The thickness around and at the bottom of the screw hole is greater than 3mm.
⑤ The specifications of bolts and nuts in the same position should be consistent, and the depth of screwing steel fastening bolts into nuts should not be less than the diameter of bolts.
⑥ The length of the countersunk steel fastening bolt extending into the screw hole should be greater than the bolt diameter, and the cast iron, copper and aluminum parts should not be less than 1.5 times of the bolt diameter; If the depth of the screw hole is not enough, it must be filled with holes.
All landowners motor junction box cover shall not be inverted.
2. On the flameproof surface, the defects within the specified length and the shortest effective length from the edge of the screw hole to the edge of the flameproof surface shall not exceed the following provisions:
1) local appearance diameter is not greater than 1 mm; There shall be no more than two sand holes with a depth not exceeding 2mm on the explosion-proof surfaces of 40mm, 25mm and15mm per square centimeter.
2) The width and depth of accidental mechanical scars should not be greater than 0.5 mm, and the effective length of the remaining lossless flameproof surface should not be less than 2/3 of the specified length.
3) Paint is not allowed to be painted on the flameproof surface (when paint is found, the inspection gap shall not exceed the regulations, and if the length of the unpainted joint surface is not less than 2/3 of the specified length, it is not considered as misfire).
3. Explosion-proof motor
1) There should be no friction between the flameproof joint surface of the motor shaft and the shaft hole under normal working conditions. When cylindrical flame-proof joint surface is used, the minimum single-side clearance between shaft and shaft hole must be not less than 0.075 mm.
2) For the rolling bearing structure, the maximum unilateral clearance between the shaft and the shaft hole should not be greater than 2/3 of the specified value in table 1.
Five, cable introduction device:
The cable lead-in device shall be complete, complete, fastened and well sealed, and one of the following circumstances is lost explosion:
1. The inner diameter of the sealing ring is larger than the outer diameter of the cable 1mm or more.
2. The difference between the inner diameter of the inlet nozzle and the outer diameter of the sealing ring exceeds the value specified in Table 2.
3. The width of the sealing ring is less than 0.7 times of the cable outer diameter, or the minimum width is less than10 mm. ..
4. The thickness of the sealing ring is less than 0.3 times of the cable outer diameter (except for cables of 70mm2 and above), or the minimum thickness is less than 4mm.
5. Multiple cables are inserted into a single hole of the sealing ring.
6. Cut the sealing ring and cover it on the cable.
7. The hardness of the sealing ring does not meet the Shore hardness of 45-55 degrees, aging (cracking, bonding, hardening, softening, pulverization, discoloration, etc.). ) loss of elasticity, permanent deformation, effective size fit gap does not meet the requirements, can not play a sealing role.
8. The sealing ring is not completely sheathed on the cable sheath (or lead skin of armored cable).
9. There are other bandages between the sealing ring and the cable sheath (or lead skin of armored cable); There is a filler between the sealing ring and the inlet nozzle.
10. Multiple sealing rings are used in one inlet nozzle.
1 1. Threaded cable lead-in device, the thread engagement is less than 5 buttons, and the length of the threaded part is less than 8mm and less than 6 buttons.
12. The thread accuracy is lower than Grade 3, and the pitch is less than 0.7mm. ..
13. Unused inlet nozzles lack sealing rings or baffles; Or the baffle is placed in the sealing ring; The diameter of the baffle is less than 2mm or greater than the inner diameter of the inlet nozzle; When the diameter of baffle is 1 10mm or more, the thickness of baffle is less than 2mm or 3mm (all baffles shall be galvanized).
14. The spiral feed nozzle in use lacks a metal ring; The metal ring does not match the wire inlet. The idle wire feeder does not need a metal ring.
15. After pressing into the nozzle, there is no margin or the inner edge of the nozzle cannot press the sealing ring tightly; The end face of the sealing ring is not in close contact with the wall; Or the sealing ring will move.
16. The feed nozzle of the pressure plate is short or not tightened, which can make the feed nozzle shake obviously with one hand.
17. The nut-type wire feeder is not tight due to improper screwing, corrosion and other reasons, or the thumb, food and middle finger of one hand indicate that the compression nut is pushed more than half a turn in the screwing direction.
18 cable is pushed with one hand in the direction of cable entrance at the entrance.
19. When insulating glue is used in the junction box of high-voltage armored cable, the insulating glue is not poured over the fork head; The cracked insulating glue can move relatively.
Six, cable connection:
Cable connection shall be considered as explosion failure under the following circumstances:
1. Vulcanization hot repair is not used for cable connection.
2. Cables (including communication, lighting, signal and control cables) are not intrinsically safe when using junction boxes, but flameproof cable junction boxes are not used (intrinsically safe control communication cables should use intrinsically safe junction boxes);
3. The connection of armored cable does not use junction box, and the intermediate box is not filled with insulating filler or the connector that leaks the core wire due to lax filling;
4. The end of the cable is not connected with explosion-proof electrical equipment or explosion-proof components;
5. Electrical equipment and cables have exposed conductors;
6. The rubber sleeve and XLPE cable sheath are damaged and exposed to the core wire (except that the shielded cable is exposed to the shielding layer or the intrinsically safe equipment connecting cable is exposed to the conductor, but it should be repaired in time).
Seven, flameproof plug-in device:
1. The power supply side of the bolt of the coal electric drill should be connected to the socket, and then connect the bolt after measuring the load. If it is connected backwards, it will be regarded as a misfire.
2. Plug-in devices lack crawling devices to prevent sudden pull-out. Plug-in devices with power supply voltage of 660V- 1 140V are considered as explosive leakage due to lack of electrical interlocking devices.
3. The maximum diameter difference W and the minimum effective length L of the flameproof surface of the bolt shell at the moment when the contact is disconnected do not meet the requirements in Table 3.
Eight, lighting appliances:
1. The pressure port of explosion-proof safety lamp is changed to Luokou, which is explosion-proof.
2. The interlock device of transparent cover can only be opened after the power supply of flameproof lamp is disconnected.
3. The glass cover of explosion-proof lamp is loose, cracked or damaged, which is a loss of explosion.
Nine, miner's lamp:
The miner's lamp used underground must have explosion-proof signs and safety signs of coal products, and one of the following circumstances shall be regarded as lost explosion:
1. The lamp holder is broken, the lamp holder ring is loose, the glass is broken, the lamp holder is not tightly sealed, and the lamp lock is invalid.
2. The lamp wire is damaged, the core wire is exposed, the lamp wire introduction device is damaged, the seal is not tight, and the lamp wire moves.