overhead cranes are the same as automobiles. After a period of use, even if there is no obvious failure, the overhead crane still needs to be maintained. This is to ensure that the crane can be used normally in the future.

Its maintenance mainly includes daily inspection, monthly inspection and annual inspection. According to the actual use situation, most units are inspected and maintained once every 3 to 4 months. Generally, daily inspections are completed by operators, mainly to check whether the control system of the bridge crane is faulty, whether there are hidden dangers in the metal structure, protection devices, and whether each working mechanism and operating mechanism are normal.

Relatively speaking, monthly inspections should be comparatively inspected, such as whether the electrical control system has any electrical components loose, whether the lubrication points of the bridge crane need to be lubricated, whether the protection devices are sensitive and effective, etc., and find potential hazards in a timely manner and perform maintenance.

The annual inspection focuses on the performance of the crane on the basis of daily and monthly inspections, inspects the electrical components and cables of the crane for aging, and replaces vulnerable parts such as wire ropes and brake pads. Whether the metal structure is deformed, whether the track is worn or not, etc. need to be carefully investigated.

The hook is also a relatively large fetching device used in bridge cranes. It bears all the loads of the lifting. During the use, once the hook is damaged and broken, it may cause a major accident. The cause of the damage and fracture of the hook is that the hook is cracked, deformed, and damaged due to friction and overload.

In order to prevent the hook from malfunctioning, overload lifting is strictly prohibited during use. During the inspection, attention should be paid to the opening degree of the hook and the wear of the dangerous section. At the same time, the hook should be annealed regularly.