Container portal crane includes Single boom jib crane and Four-link type portal crane, which has been extensively used to load and unload at port, jetty,shipyard. The main structure are composed of steel structure,hoisting mechanism,luffing mechanism,slewing mechanism,crane traveling mechanism,machine room,and lifting tools such as container spreader, grab, magnet and hook, and other accessories. Steel structure mainly includes boom, A-bracket,slewing platform,gantry frame and bogie system.