The gantry crane overload protection device can be divided into automatic stop type, alarm type and integrated type according to its function.
Automatic stop overload limiter can stop the gantry crane operate to unsafe direction when the lifting weight exceeds the rated capacity, and at some time allow operate to safe direction. The safe direction refers to the loading falling, shrink boom frame, reduce amplitude and these actions combination. The automatic stop type is generally mechanical overload limiter, used for tower cranes.
Alarm type overload limiter can display the lifting weight, and give alarm sound and light signals when reach 95% ~ 100% of the rated lifting weight.
Integrated overload limiter can give alarm sound and light signals when reach 95% ~ 100% of rated lifting capacity, when the lifting weight exceeds the rated capacity, can stop the gantry crane to the unsafe direction.
The gantry crane overload limiter can be divided into mechanical type, hydraulic type and electronic types according to structure, and the mechanical type overload limiters has leveraged type and bombarded type.
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