Crane hook rotation causes and preventive measures

 Crane hook rotation causes and preventive measures for your reference to make your crane operation more safety and efficient. Check Dongqi crane company operation tips to prevent crane hook rotations now. Dongqi your crane specialist at side.

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What is crane hook rotation?

Crane hook rotation is often happening without any warning occurred in the lifting motion, when the crane is lifting some weight, crane hook rotates, the wire rope between hook and pulley twisted together, so it will be the lifted weight, then the lifting operation have to be mid-stop. Crane hook rotation can affect the lifting operation, seriously threatening the safety of workers and equipment, therefore it must be avoided.

Crane hook rotation causes

The cause of crane hook rotation is mixed with the internal and external factors of crane. The internal cause is indeed the root cause of its occurrence.

Internal factors to crane hook rotation

Crane wire rope regardless of model, specifications, grades, will produce torque in the force. Torque is formed due to the manufacturing process of wire rope, first wires twist together to make a strand, and then several strands twist together making a rope. When there is force in the rope, the wire and the strand will be straightened, but the end of the wire rope is fixed, so it will produce a torque in the wire rope.

Another cause of the torque is the rope pitch becomes longer after a period of time usage, thus it makes torque in rope even there is no force in it, the existence of torque makes the hook rotate.

External factors to crane hook rotations

On the other hand there are many external factors that directly lead to the rotation of hook, such as the human or wind force during the hoisting process.

The operator is not steady moving the crane so that the hook and the weight swing cause the hook rotation, the unbalance of hook etc.