Gantry crane metal structure of the safety precautions

          overhead gantry crane  used in the process, we must ensure that the bridge girder under no excessive deflection and permanent deformation under torsion. Otherwise, there will be the following hazards:
(1) on their own after the car brakes "slip on" is not an accurate stop when climbing in the car would cause motor overload and burn out the motor.
(2)bridge gantry crane the running gear shaft distortion of excessive force too. Cause coupling bolts broken, or even broken shaft.
(3) the deformation caused by the wheel-rail trolley car rails,steel crane and even car derailment; under the cover of the main beam and the web of cracks, seriously threaten the safe operation of Wo.