Why Not Allow Crane Oblique Hanging?
Why Not Allow Crane Oblique Hanging?
First, oblique hanging may cause overloaded;
Assuming lifting Q weight object from ground, vertical lifting, wire rope tension S is equal or slightly greater than Q, the object can be off ground.
But if oblique lifting, wire rope and the ground vertical line will into one angle. According to the principle of mechanics, the tension S acting on the wire rope can be decomposed into the vertical upward force P and the horizontal force F which make the movements of the object, to make the object hanging from the ground, P at least equal to Q. While F increases as the angle increases. That is, when the larger oblique hanging angle, the greater the wire rope forced when lifting the same weight object. So, if object vertically lifting is full load, so when oblique hanging inevitably makes overloaded, even the wire rope pulled off accident will happen.
Second, the oblique hanging generates inertial forces which endanger people around;
In addition, the oblique hanging resulting horizontal force F, before object leaving the ground also impact by the frictional force. When the instant off the ground, the object swing to the vertical center, which possibly cause accidents by collisions with hanging personnel, operation personnel or other objects around.
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