Hoist is a large-scale mechanical equipment, such as mine hoist, dam hoist, etc. Broadly speaking, elevator, crown block, winch, stable car, crane, hoist, etc. can be called hoist. Hoist generally refers to large mechanical equipment with large power strong lifting capacity. The transportation process is completed by driving the flexible steel wire rope the transported goods up down by power machinery. The steel wire rope is an indispensable part of lifting machinery, the main varieties include phosphating coated steel wire rope, galvanized steel wire rope, stainless steel wire rope, smooth steel wire rope, etc. The elevator is used to vertically lift the limestone, coal, gypsum, clinker, dry clay other granular materials, as well as raw meal, cement, pulverized coal other powder materials. According to the different speed of hopper operation, bucket elevator can be divided into three types: centrifugal discharge, gravity discharge mixed discharge. The bucket speed of centrifugal discharge is faster, which is suitable for conveying powder, granular small pieces of materials with small grinding property; the bucket speed of gravity discharge is slow, which is suitable for conveying massive, specific gravity high grinding materials, such as limestone, clinker, etc.