Replace the sheave job preparation work: Xintian wheel must be carefully checked prior to use for each site. Checked for the use of wire rope can be put into use after passing Inner Mongolia sinking sheave, wire rope used during operation must rope the new establishment. Lighting the main wellhead repair and overhaul heaven round lighting. Sheave is Mine Shaft Derrick Top adjust the direction of movement of the fixed pulley rope. Role is to prop up the wire rope hoist drum connected to the container and to enhance and guide rope steering. There are swimming sheave sheave, Inoue fixed sheave, fixed sheave shaft sinking and underground three.