Product Description Specifications Crane Pulley Group

saving labor

supporting wire rope

high quality material

ISO/CE/SGS certificate

Pulley Introduction - Pulley plays a role of saving labor,supporting wire rope and being a guide for wire rope. Materials constitution - For light and medium-size Bridge Crane, pulley can be made with gray cast iron HT15-33 and nodular QT-10. - For heavy bridge crane, pulley is produced with cast steel ZG25 or ZG35. - Major diameter pulley(D>800mm)can be weld with carbon steel Q235A. Diameter of pulley has a direct impact on service life of wire rope. - Wire rope will bent once every time it is through the pulley. - Repeated bent is one of the most important reasons causing rope damage. - The smaller diameter of pulley is, the more seriously wire rope bends and the more quickly wire rope damages. - It requires the diameter of pulley and wire rope keep a reasonable proportion to make wire rope a long service life. - In order to make wire rope through pulley smoothly, radius of pulley groove bottom should be slightly bigger than radius of wire rope,that is to say, r=(0.53~0.6)d. When diameter of wire rope is bigger. Safety Inspection of Pulley - Pulley can rotate agilely with hand-handling in normal working condition, and lateral swinging no more than D0/1000(D0 is the nominal diameter of Pulley Block). - Cuttings and dust in the oil-way and oilhole on the shaft must be cleaned. Inspect whether oilhole and oil sink on the spacer bush between the bearings is aligned or not. - When there are flaws on the pulley, the pulley should be discarded as useless and stopped to use. - Radial direction of pulley rope groove abrades no more than 30% of rope diameter; - Pulley groove wall abrades no more than 30% of original wall thickness. - Defect area in the axle hole is less than 0.25cm square, depth no more than 4mm. Product Pictures  

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Product Categories : Crane Spare Parts