Coker Crane is an single leg gantry (semi gantry ) or gantry crane or electric QZ type grab bridge crane designed for handling coke, single leg gantry coker crane is composed of a double girder semi gantry crane and a clamshell grab. The double girder semi gantry crane is a kind of crane between the bridge crane and the gantry crane. The crane has only one outrigger and the other end of the crane Like an overhead crane, it is placed on the crane beam of the factory building. The running track on the factory building is commonly called the sky rail, and the running track on the ground is called the ground track. The hoisting mechanism, trolley running mechanism and bridge structure of the double girder semi gantry crane are basically the same as those of the bridge crane. Due to the large span, the crane operating mechanism is mostly driven separately to prevent the crane from running skewed and increasing resistance, or even an accident.