集装箱运输的优越性越来越显著。目前全世界约有150个港口开展集装箱运输业务,集装箱装卸机械达1700多台,年吞吐量达3,000万只。随着集装箱船的大型化,使集装箱起重机也相应地向大型、高效、轻量方向发展。例如集装箱起重机的海侧悬臂伸距从原先的23米增大至36米,起升高度从22米提高至25米。随 The superiority of container transport is more and more obvious. At present, there are about 150 ports in the world to carry out the container transportation business. The number of container handling machines is over 1,700 sets, with an annual throughput of 30 million. With the enlargement of container ships, container cranes have also been developed in a large, efficient and lightweight manner. For example, the container crane’s sea side cantilever reach increased from 23 meters to 36 meters and lifting height increased from 22 meters to 25 meters. With