Since large cranes often operate under conditions of heavy load, high temperature and dusty conditions, and high operating frequency, it is not easy for lubricating grease to be stored on the sliding friction surface, which makes the bearings work in harsh environments. The most outstanding performance is the matching part of the upper pin shaft of the gantry plate hook and the shaft sleeve. Although an oil hole is drilled in the center of the pin shaft, it can be regularly greased by the centralized lubrication pump on the gantry frame, but it is often subjected to high-temperature baking by molten steel. The grease is dried and even carbonized and caked, making refilling difficult. This part has a small action swing and a large bearing specific pressure. It is difficult to form a uniform oil film on the bushing, resulting in dry friction between the bushing and the pin, and the hook cannot swing normally. In the past, it was relied on artificially to regularly apply oil on the surface of the bushing. , because the hook is often under high temperature, heavy load, and dusty conditions, the oil film is quickly squeezed away or dried. At the same time, there is still a lot of steel slag remaining on the surface of the lining, which causes the surface of the lining to be rough or cracked. Therefore, the Viiplus inlaid graphite bearing, a mixture of graphite lubricating material and polymer organic material, has a good practical effect.