How to effectively ensure crane pulleys for construction safety
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1. It is necessary to ensure that the ratio between the pulley diameter and the wire rope diameter is not lower than the specified value. At the same time, the value h2 specified for the balance pulley must not be less than the rated value. Additionally, the bridge-type crane and the specified pulley must have the same value. It should also be given special attention that for crane types with boom mechanisms, the value must not be lower than 0.6 times the specified pulley value. II. The pulley must not have any defects or cracks, and the inside of the pulley groove must remain smooth and even. Defects that could damage the steel wire rope must not occur. III. New pulleys need to be replaced when the pulleys inside the crane are in the following conditions. a. Internal cracks are very obvious. b. The inside of the wheel groove is uneven, and the degree of wear has exceeded 3 mm. c. Due to wear, the diameter at the bottom of the wheel groove decreases by 50% compared to the diameter of the steel wire rope.
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