1. Application scope: Electric hoist
2. It’s simply constituted by some fixed pulleys and movable pulleys.
3. It’s widely used in cranes, winches and elevators.
For light and medium duty overhead crane, its pulley could be cast by gray cast iron HT15-33 and ductile iron QT-10; for heavy duty overhead crane, the material could be cast steel ZG25 or ZG35; and for big-diameter (D＞800mm) pulley, it could be welded by carbon steel Q235-A.