Bridge cranes are a commonly used lifting and transportation machinery in factories, accounting for approximately 80% of all cranes. Therefore, their management and use are crucial. During the use of bridge cranes, it is necessary to ensure that the main beam of the bridge does not undergo excessive downward deflection or permanent downward deflection deformation. Otherwise, the following hazards may occur:

       (1) After braking, the trolley will "slip" and fail to stop accurately, which can cause the motor to overload and burn out when the trolley climbs a slope.

       (2) Twisting the transmission shaft of the walking mechanism can cause excessive stress, resulting in the breakage of the connecting bolts of the coupling, and even the shaft itself.

       (3) Deformation of the trolley track can cause the wheels to slide off the track, or even lead to trolley derailment accidents, resulting in cracks on the lower cover plate and web plate of the main beam, posing a serious threat to safe operation.

In the daily use and management process, unstable factors that affect equipment performance often occur. If not addressed in a timely manner, minor issues such as malfunctions may arise, disrupting normal production, and in severe cases, accidents may occur. Therefore, it is essential to regularly inspect the components of bridge cranes to prevent accidents.

       (1) The pulley groove of the bridge crane experiences uneven wear, which can easily lead to uneven contact between the steel wire rope and the pulley. In severe cases, it may result in operational accidents. If the wear of the pulley shaft exceeds the acceptable limit, it can easily cause the pulley shaft to break. Once the wear exceeds the relevant regulations, the pulley shaft must be replaced.

       (2) If the drum of a bridge crane experiences excessive wear or develops fatigue cracks, it is prone to damage. If the drum key is severely worn, it can easily fall off or be sheared off, and in severe cases, it can lead to the fall of heavy objects. In such cases, replacement is necessary.

       (3) If the small shaft, spindle, and brake wheel of the brake of the bridge crane are worn beyond the standard, and the tension rod and spring have fatigue cracks, it is easy to cause the brake to fail, and they should be replaced.

       (4) If the dangerous section at the opening of the hook is excessively worn, or if fatigue cracks appear on the thread relief groove at the tail or on the surface of the hook, it can easily lead to the fracture of the hook. Therefore, the hook should be inspected 1-3 times a year, and any problems found should be promptly addressed by replacement.