1. The selection of gantry crane It conforms to the relevant regulations of general gantry crane GB/T14406-1993 and GB5905-86. Under normal circumstances, the lifting weight is less than 50t, the span is less than 35m, and there is no special use requirement, the single main beam type should be selected. If the door leg width is large, the working speed is high, or heavy and long pieces are frequently lifted, the double-beam gantry crane should be selected. 2. Span and cantilever length The span of the gantry crane is an important factor affecting the quality of the crane itself

Gantry crane is a variant of bridge crane, also called gantry crane. Mainly used for outdoor cargo yard, stock yard cargo, bulk cargo loading and unloading operations. Its metal structure is like a door-shaped frame, with two supporting feet installed under the main beam, which can walk directly on the track on the ground. The two ends of the main beam can have outhanging cantilever beams. Gantry cranes have the characteristics of high site utilization, large operating range, wide adaptability and strong versatility, and are widely used in port freight yards.

1). The appearance of the bridge crane: sweep the appearance completely, so that there is no dust and no yellow robe. Check for cracks and open welding. 2) Large carts and small carts: ①Check and tighten the transmission shaft seat, gearbox, coupling, shaft and key for looseness; ②Check and adjust the brake wheel clearance to make it uniform, sensitive and reliable. 3). Check the bridge crane reducer mainly to see if it leaks oil. If there is abnormal noise in the box during operation, open the box cover to check. Generally due to bearing damage or gear meshing backlash

Due to the influence of vibration, wear, pressure, temperature and other factors on the trolley reducer of bridge cranes, oil leakage often occurs in the static sealing parts of each joint surface. The traditional treatment method involves disassembling the reducer, replacing the sealing gasket or applying sealant, but it is time-consuming and laborious, and it is difficult to ensure the sealing effect, and leakage will occur again during operation. Contemporary Western countries mostly use polymer composite materials to treat leakage on site, and the most used Blessed World Blue series. Polymer materials can be repaired without disassembly

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The bridge crane is a lifting equipment that is horizontally framed over the workshop, warehouse and material yard for material lifting. Because its two ends are located on tall concrete columns or metal supports, it is shaped like a bridge. The bridge frame of the bridge crane runs longitudinally along the tracks laid on the elevated sides on both sides, which can make full use of the space under the bridge frame to lift materials without being hindered by ground equipment. It is the most widely used and the largest number of cranes.