Briefly describe how to maintain the two most common faults in bridge cranes

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A bridge crane has a structure similar to that of a bridge; it is a lifting device that spans across tall concrete columns or metal supports on either side. The space under the cable tray can be fully utilized for cargo transportation, without being hindered by obstacles on the ground. However, bridge cranes are the most widely used and prevalent lifting equipment. Therefore, we need to have a thorough understanding of and pay close attention to the fault repair and maintenance of bridge cranes. There are two common faults in bridge cranes: one is the repair of oil leakage in the trolley reducer, and the other is the repair of wear on the main girder reducer and the drive wheels. First, let’s talk about repairing oil leakage in the reducer of a vehicle. Oil leakage mainly occurs in the reducer of the trolley due to factors such as vibration, friction, compression, and high temperatures. The traditional repair method involves removing the reducer, replacing the gasket, or using sealant; however, this is not necessarily reliable, and oil leakage will occur after some time of use. Currently, European and American **polymer composite materials are used for maintenance; these materials do not require disassembly, and they offer excellent adhesion, durability, as well as a 350% elongation rate. Therefore, compared to traditional repair methods, this approach yields more effective repair results. Secondly, it is the repair of the heavy vehicle reducer and the worn driving wheels. This is mainly due to the frequent rapid operation and stopping of the drive wheels and the main reducer, which subjectes the various shafts of the reducer to high torque and vibration, thereby making oil leakage more likely to occur. According to traditional repair methods, this is done through patch welding or brush plating followed by machining for repair. However, welding repairs tend to cause bending or cracking, while brush plating can lead to material loss. Moreover, since these two metals are used for repair purposes in combination, they do not attract each other fully, which makes wear more likely to occur. The latest modern repair method involves the use of polymer composite materials, which possess strong adhesive strength and compressive resistance. Therefore, compared to traditional repair methods, this approach is more effective; it can also extend the lifespan of equipment components, helping to save costs and create value.