Sheave: Press the "Coal Mine Safety Regulations" Shanxi 800 fixed sheave, rope diameter ratio of the smallest diameter of the sheave lifting equipment shall comply with: Inoue lifting cylinder means and holding angle greater than 90 ° around the sheave 800 fixed day Liaoning round, shall not be less than 80; Wai hold less than 90 ° angle sheave, not less than 60; underground Wai hold angle of 90 ° is greater than the sheave, not less than 60; Wai hold less than 90 ° angle of not less than 40 days round. 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, should be flexible rotation, no abnormal noise.