Smaller plants mean initial investment in construction, and long-term savings in heating, air conditioning and other maintenance costs. Light crane is a kind of lifting machinery, it is a kind of machinery that circulate and intermittently move. A work cycle includes: the extract is lifted from the extract to the object, then the level moves to the specified place to drop the item, then the reverse motion is carried out so that the extract device is back in place for the next cycle. Usually hoisting machinery (also including light crane) is composed of lifting mechanism (making up and down movement of goods), operating mechanism (making lifting machine moving), amplitude changing mechanism and rotating mechanism (making horizontal movement of goods), combined with metal mechanism, power device, control control and necessary auxiliary device.