Why does cranes and hoists hook rotate and what we should do?

Keyword:cranes and hoists   Time:2018-11-30 8:01:08

The cause of cranes  and hoists hook rotation and preventive measures
 The  internal and external factors mixed causes the hook in the hoists and cranes rotate.  The fundamental reason for this is the internal factors of the crane.
 The  phenomenon of hook rotation
 No  matter what the type, specification or grade, hoists and cranes wire rope will  produce torque force. Because of the torque in the manufacturing process of the  wire rope, the first wire wound together to form a thread, and then several  strands were twisted together to form a rope. Under the condition of the force  of the wire rope, the wire ropes will be straightened, and the ends of the wire  rope will be fixed to make the wire rope produce torque. Another cause of  torque is that after a period of use, the pitch of the rope grows longer, even  if there is no force within it, and the existence of torque in the rope makes  the hook spin.
 In  other words, many external factors can also directly lead to the rotation of  hooks, just like people or wind forces exist during hoisting. When the operator  moves the crane unsteadily, the hook and weight will swing, causing the hook to  rotate and the hook to be unbalanced.
 Anti  rotation measures of cranes and hoists
 The  operator can move the hook smoothly to avoid the hook rotation of cranes and  hoists, the hoisting hook is placed at the center of the hoisting material, and  the wire rope is straightened first before lifting the material. In order to  ensure the safety and reliability of the wire rope, the wire rope should be  refixed every year. Without any load, it will be free and useless.
 It  is important to note that when the wire rope is torsional, the lifting movement  should be stopped immediately, otherwise the crane will be damaged, or even the  dangerous factor of the workers in the vicinity.

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