What Are the Special Requirements for Repairing Explosion-proof Motors?

Explosion-proof motor is a kind of motor that can be used in flammable and explosive places, and it does not produce electric sparks during operation. Explosion-proof motors are mainly used in coal mines, oil and gas, petrochemical and chemical industries. In addition, it is also widely used in sectors such as textiles, metallurgy, urban gas, transportation, grain and oil processing, papermaking, and medicine. As the main electrical transmission equipment, explosion-proof motors are usually used to drive pumps, fans, compressors and other transmission machinery.

Ⅰ. How to judge whether a motor is an explosion proof motor?

If the spark ignites the volatile gas in the motor, the explosion-proof design will stop the internal combustion and prevent more serious explosions or fires. The nameplate of the explosion-proof motor clearly indicates the specific hazardous environment to which the motor is applicable.

According to different motor certification agencies, the nameplate will clearly indicate the classification, division and grouping of hazardous locations applicable to explosion-proof motors.

Ⅱ. What are the special requirements when repairing an explosion proof motor?

1. The explosion proof electric motor must not be disassembled at will. During disassembly and maintenance, the explosion-proof surface of the part cannot be used as the fulcrum of the crowbar, and it is not allowed to knock or hit the explosion-proof surface.

2. When disassembling the explosion-proof motor, first remove the wind cover and the fan, and then use the casing wrench to remove the bolts of the end cover and the bearing cover. Then, use a log or copper rod to hit the shaft in the axial direction to separate the end cover from the base, and finally remove the rotor. Remove the parts, put the explosion-proof surface upwards, and cover them with rubber or cloth gaskets, tighten the bolts, and be careful not to lose the spring pads.

3. When dipping and assembling, the insulating paint or dirt attached to the explosion-proof surface of the explosion-proof motor should be cleaned. It is not allowed to scratch with hard objects such as iron sheets, but it can be used to grind uneven areas with oilstone.

4. If the explosion-proof surface is damaged, it must be welded with suitable materials, otherwise the motor control system will be damaged. The solder used is lead-tin solder HISnPb58-2, and the flux is 30% hydrochloric acid (for steel parts) or tin-zinc solder containing 58 to 60% tin. The flux is 30% ammonium chloride, 70% zinc chloride, add water 100 to 150% mixed solution (for cast iron parts) for welding repair. The combination of solder and parts should be firm, and the convex part should be ground flat to achieve the required finish.

5. In order to prevent the explosion-proof surface from rusting, oil or 204-1 replacement anti-rust oil should be applied to the explosion-proof surface of the explosion-proof motor.