The application of explosion-proof electric hoists is quite special, and generally speaking, the requirements for explosion-proof are relatively high. The explosion-proof level of explosion-proof electric hoists is mainly divided into three levels of explosion-proof and four levels of explosion-proof, and different explosion-proof products correspond to different environments.

　　All electrical components of the electric motor are installed in an explosion-proof enclosure, consisting of several seats, end covers, bearing inner covers, shafts, junction boxes and covers, wiring terminals, wiring screws, sealing rings, threaded terminal sleeves, compression nuts, etc. The number of fastening bolts connecting the explosion-proof enclosure is indispensable, and each bolt is equipped with a spring washer to prevent self loosening, otherwise it will lose its explosion-proof function.

　　The outer diameter of the cable introduced by the electric motor matches the inner diameter of the sealing ring at the inlet of the junction box. After connecting the wires, the sealing ring is tightly pressed by the compression nut to ensure that there is no gap between the outer diameter of the cable and the inner diameter of the sealing ring, as well as between the outer diameter of the sealing ring and the inner hole of the junction box seat, in order to achieve explosion-proof function. The inner diameter of the sealing ring at the inlet of the brake is Φ six

　　The mating surface between explosion-proof shells is an explosion-proof mating surface, such as the mating surface between the machine base and the end cover, the mating surface between the shaft and the inner cover, the mating surface between the threaded sleeve and the wiring screw, etc. The explosion-proof mating surface should not be collided or corroded.