There are two places where the cable is liable to break, namely the gantry cable which provides the axial motion current input to the whole crane. When the whole gantry crane moves in axial reciprocating direction, the cable is placed on a disc. With the gantry crane moving in axial reciprocating direction, the gantry crane cable also moves in reciprocating direction on the disc, which is actually the round-trip fatigue damage of the gantry crane cable.
After a period of time, the conductor of gantry crane cable is easy to fracture, and because the power of axial movement is generally large, the cable users choose is usually YC3×16+1×6 square mm or more, with large specifications and poor softness, which is more prone to fracture. Another easily broken gantry cable occurs in the gantry cable that provides current to the trolley in radial motion. Two small wheels are fixed on both sides of the radial moving trolley, with small diameter. The gantry cable moves back and forth on these four small wheels, which is almost the same as cable bending test, and belongs to a destructive working mode.
The gantry cable required by the general car is more than the need to compose the flexion test (more than 4 square millimeter does not need to compose the flexion test) of the large specifications of the cable, poor flexibility, and the fixed cable wheel diameter is small, bending radius is small, it is very easy to produce cable conductor fracture.