Electric wire rope hoist single multi reel

Electric wire rope  lever hoist  drum major play in lifting mechanism hoisting or hauling bodies and winding rope.
Electric hoist wire rope electric hoist drum where the number of layers can make single or multi-layered. Normally they use a single hoist drum. Single hoist drum surface is usually cut helical grooves, a rope wound in the groove, the contact area between the rope and the drum increases, the pressure reducing unit, and to prevent friction between adjacent wire, extending the life of the rope .
Spiral groove is divided into two kinds of shallow grooves and deep grooves, generally use more standard slots, only when there is the use of rope brackets dangerous only when using trench hoist drum. Single drum hoist pulley block with single spiral groove; twin pulley reel double spiral grooves symmetrically distributed.
Multilayer winding drum  manual hoist  for lifting height is large, while the electric hoist roll length and limited circumstances, such as cranes, electric hoist drum winding layers generally made smooth, and its inner rope by the outer layer extrusion wire in the winding process the friction between adjacent loops, reduce the life of the rope. Moreover, constant tension on the rope, the rope on the drum with the load torque varies layers, resulting in instability of the load torque. To improve the hoist wire rope on the drum in the released state, to improve the life of the rope,hoist equipment and there is also a spiral groove around the hoist multi-roll.