Sheave type: Tianlun divided into three types. Shaft sheave, shaft sinking sheave, swimming sheave. Sheave bottom rope circle of diameter less than or equal to 3000mm wheel with steel structure 1200 sinking sheave plant, round bottom rope diameter greater than 3000mm wheel body with molded steel rim structure, bearing types are used rolling bearings. Sheave: sheave wheel assembly. Supplied in 1200 when riveting for sinking sheave, which binds to the surface must be cleaned of burrs and rust treatment, rivets and rivet holes should be smooth, dimensions meet the requirements of 1200 sinking sheave manufacturers, are not allowed to use a defective or too burned rivet after rivet nail head should be full, it does not allow cracks, dents or other defects nailhead skew.