Sheave: sheave wheel assembly. Countersunk rivets riveting rim protruding nail head, recessed deviation should be less than 0.5mm. Should close fit between the rivet parts Hebei mine sheave, 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. Sheave for hoist drum and container lifting operation between the support and guide ropes, is one of the key equipment in the mine hoist system. Structural features: cast iron sheave into Shandong mine sheave, cast two-day round of mine, structure to increase day by day round life wheel, wheel groove, V-groove in two by a dovetail Shaanxi mine. Supporting both ends of a given ring bearings, roller bearings.