The jib crane fetching device is hung on the end of the boom or on a hoisting trolley that can run along the jib. The jib crane that can rotate but cannot pitch is called a cantilever crane. jib crane is a small and medium-sized lifting equipment developed in recent years. It has unique structure, safety and reliability, high efficiency, energy saving, time saving, and flexibility. It can be operated at will within three-dimensional space. Other conventional lifting equipment shows its superiority.