Mainly used in some production do fluid space narrow and small scale of phosphate rock, metal, non-metallic mineral of gravel soils of explosion dangerous mines, such as the collection and transportation loading construction. It is by the manipulator joint with conveyor, acquisition and transmission function 2 for one, the use of electric hydraulic control system of the production unit, safe environmental protection, small energy consumption, high efficiency characteristics. Is an essential part of mines and pram hence hole when advanced mining equipment, is a man-made and other mechanical alternatives.