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Longmen crane is a variation of bridge crane. In ports, it is mainly used for loading and unloading operations of outdoor cargo yards, material yards, and bulk cargo. Its metal structure is like a portal frame, with two legs installed under the main beam, which can walk directly on the ground track. The two ends of the main beam can have outward overhanging cantilever beams. The gantry crane has the characteristics of high site utilization, large operating range, wide adaptability, and strong universality, and is widely used in port cargo yards.