Why harbor cranes and other lifting must be vertical?

Of course, not just lifting must be perpendicular to the port bridge gantry crane s, as well as various types of quay cranes and other lifting machinery is so. About a dozen non-lifting cranes, etc., do not know we are not clear? If in doubt, have the opportunity to work with you on it. One of them is not hanging ten: not allowed oblique oblique hanging. There may be some specific reasons people do not quite understand, analyze here with us, so that we can truly understand, remember it from the heart, to ensure the safety of construction operations.
1, oblique hanging may overload
Assuming the weight lifted from the ground as Q of objects, vertical lifting, rope tension is equal to Q S as long as or slightly larger than Q, the weight can leave the ground.
However, if the oblique, and the ground wire to the vertical at an angle. According to mechanics, the role of the tension on the rope S, so that the object can be decomposed into a vertical upward force P and the horizontal movement of the force F, to make the object hanging from the ground, P at least equal to Q. F same as the angle increases. That is,overhead bridge crane the larger the angle oblique hanging in the lifting heavy objects the same time the greater the force rope. So, if a full load when lifting heavy objects vertically, then diagonally hanging inevitable when overload occurs even rope pulled off by accident.
2, oblique hanging produce inertial forces dling personnel
In addition, the oblique hanging horizontal force generated when the F, when the heavy left front also subject to the effects of friction. After leaving the ground a moment, would object to the vertical center of the swing, it is possible and hang hanging personnel, operations personnel, or other objects around the jostling caused by accidents.
Therefore, these two aspects, the oblique oblique lifting  overhead gantry crane  is absolutely not allowed, making sure the goods required when lifting vertically.
For all types of large construction machinery, every detail needs to be done very close to perfection, this is the basis for future development!