Pulleys are crane bypass, wheels crane

Crane wheels are usually distinguished in form of wheel rim and on number of flanges. The form of rim happens cylindrical and conic. If wheels are connected to the mechanism of the crane or the cart, they are called drive or leading, other wheels - conducted. Also wheels differ in nave on - to inside diameter on installation of ball - bearings or shaft with two axle boxes on roller bearings. Crane wheels are made standard dimensions, production and according to drawings of the customer is possible. Are made with requirements of GOST 28648 - 90. The surface of driving and flanges of crane wheel is exposed to heat treatment to the hardness demanded according to the standard with soft junction of the tempered layers to not tempered. Depth of the tempered layers can reach 30 mm depending on diameter. Preparations of crane wheels make by method of stamping, free forging or molding. Preparations of crane wheels are made by method of stamping or free forging of steel 65G (45) or molding from steel 65GL (45GL) with the subsequent machining of working surfaces. For control of compliance of crane wheels to requirements of GOST 28648 - 90 acceptance tests are carried out. At each wheel check the sizes, production accuracy, roughness and hardness of surfaces. Hardness of surface of driving and flanges is checked in accordance with GOST 9012. Control of depth of tempering is carried out on cross templet of wheel in accordance with GOST 9012 or GOST 9013. Operation of crane wheels is allowed at wear of their flanges no more than 50% of initial thickness and (or) surface of driving no more than 1,15% of initial diameter. For maintenance of cranes in working order, at wear of wheels, they need to be replaced timely