Sheave is Mine Shaft Derrick Top adjust the direction of movement of the fixed pulley rope. Tianlun test: Check sheave and parts geometry meets the requirements. Radial runout and face measurement dial gauge, ruler and marking tape sheave rope grooves runout. NDT inspection day axle. Manually rotate the wheel lift sheave, should be flexible rotation mine hoist sheave, no abnormal noise. Sheave: sheave wheel assembly. Countersunk rivets riveting rim protruding nail head, recessed deviation should be less than 0.5mm. Among riveting parts should fit closely, the extent of its close fit within the circumferential extent of twice the radius of the nail head gap should be less than 0.1mm, with a feeler.