The crane is not allowed to be carried out lifting diagonally, that is, the hoisting wire rope must pass through the center of gravity of the lifting object and keep vertical. But, why is it not allowed to lifting diagonally?
1. Inclined lifting may cause overload.
To lift an object from the ground, when lifting vertically, as long as the wire rope tension is equal to or slightly greater than the weight of the object, the heavy object can leave the ground.
However, if pull diagonally, according to the principle of mechanics, the larger the angle when obliquely hanging, the greater the force on the wire rope when lifting the same weight. If a heavy object is fully loaded when it is vertically lifted, then it will be overloaded when it is hoisted diagonally, and even the wire rope is broken and the heavy object falls.
2. Inclined suspension generates inertial force and endangers surrounding personnel
The horizontal component force will be generated when hanging diagonally, and the weight will also be affected by friction before leaving the ground. When leaving the ground, the object will swing toward the vertical center, which may cause collisions with surrounding workers or other objects and cause accidents.
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