Relevant knowledge of electric hoist drum

The number of layers on the drum where the electric hoist wire rope is located can be single-layer or multi-layer. Most cranes use single-layer drums, with spiral grooves usually cut off from the surface. The steel wire rope is wound in the groove at once, increasing the contact area between the rope and the drum, reducing the unit pressure, and preventing mutual friction between adjacent steel wire ropes, extending the service life of the steel wire rope.

The multi-layer winding electric hoist drum is used for situations where the lifting height is very high and the length of the electric hoist drum is limited, such as automotive cranes. The multi-layer winding electric hoist drum is generally made of a smooth surface, and its inner steel wire rope is squeezed by the outer steel wire rope, causing friction between adjacent rope loops during the winding process, reducing the lifespan of the rope. In addition, when the rope tension remains constant, the load torque varies with the number of rope layers on the drum, resulting in unstable load torque. To improve the release status of the steel wire rope on the electric hoist drum and increase the service life of the rope, there are also multi-layer winding electric hoist drums with spiral grooves used

The electric hoist drum can be cast or welded, and there are also seamless steel pipes used. The casting of electric hoist drums is generally made of cast iron not less than HT200. When special needs arise, cast steel such as ZG230-450 and ZG270-500 are used. Important electric hoist drums can be made of ductile iron. Nowadays, in order to reduce mass and increase strength, electric hoist drums are mostly welded and processed from Q235A and 16MN steel plate drums.

The diameter of the electric hoist drum directly affects the bending strength of the steel wire rope. To ensure the service life of the steel wire rope, the diameter of the drum cannot be too small, and the winding diameter of the electric hoist drum must be greater than a certain multiple of the diameter of the steel wire rope.