Development and chanllege of unmanned autonomous longwall fully-mechanized coal mining face

Intelligent unmanned mining is a technical approach to realize safe and efficient mining in coal mines. According to the general law of the development of unmanned control system, the development stages of the longwall mining face control system was analyzed, including remote control, automatic control, and autonomous control. The autonomous control of fully mechanized mining face needs to solve five problems listed as follows: the real-time perception of longwall mining face environment, the coordinated control of "three machines"for fully mechanized mining, the high-precision geographic information system of coal seam, the intelligent decision making of mining sequence and the evaluation experiment method of unmanned fully mechanized mining face. Three objectives and tasks of the fully-mechanized coal mining face control system were summarized, which include reliable cutting and loading of coal, maintaining the geometric relationship of the working face, reliable support of the surrounding rock. Eight key technologies of the fully mechanized face control systems include hydraulic support electro-hydraulic control technology, cooperative control technology of fully mechanized mining equipment, communication technology in working face, working face visualization technology, positioning technology of shearer, automatic heightening technology of shearer, automatic alignment technology of working face, surrounding rock support and control technology of working face. The relation between key technologies and tasks of the longwall mining face control system was analyzed. According to the requirements of key technologies and problems of autonomous control of longwall fully-mechanized coal mining face, the primary problems to be solved from the automatic control to the autonomous control of the lognwallfully-mechanized coal mining face was put forward, including the precise coal seam geographic information system of the fully-mechanized coal mining face, the cutting planning strategy of the shearer, the intelligent support strategy of surrounding rock and the applicability evaluation method of the longwall mining face control system.