Study on key technology of intelligent control in fully-mechanized top coal caving face in extra thick seam

Intelligent mining in coal mines is one of the core supporting technologies for achieving high-quality development of China's coal industry, especially the realization of intelligent mining of medium thick and extra thick coal seams, which account for the largest proportion of China’s coal production capacity.In view ofthe three major constraints on the development of intelligent control technology for fully-mechanized top coal caving face in ultra-thick coal seam, the automatic movement of the machine and the controllability of the intelligent coal caving and the identification accuracy of the top coal and rock, the development of the intelligent control technology for the three-thick coal seam fully mechanized caving face was proposed.The system's multi-stage filtration intelligent control technology of the liquid supply system, the hydraulic support memory coal mining discharge technology of the fully-mechanized caving face and the top coal and coal rock identification technology were put forward.On-site industrial tests were carried out at the No.8202 working face of Tongxin Mine of Tongmei Group.The working face realized the intelligent program cutting of coal in 22 edited states of the shearer, intelligent follow-up of the support through integrated fully-mechanized caving automation control system.The integration of systems such as intelligent coal discharge, intelligent video monitoring and intelligent integrated liquid supply have realized the remote centralized intelligent control and manual intervention of the roadway and the ground dispatching center, breaking through the working face with an annual output of more than 10 million tons and the working face recovery rate reached more than 87%, the power consumption per ton of coal was less than 9.1 kWh, the output value reached 4.65 billion yuan, and the profit reached 500 million yuan.It has achieved an innovative breakthrough in the key technology of intelligent control of fully-mechanized caving face in extrathick coal seams and put forward solutions to the problems existing in the industrial test of No.8202 working face.The research results have a practical significance for improving the research and implementation effect of high-end major equipment applicability, accelerating the mechanization, informationization and intelligent level of coal mining in China, and have important practical significance for the rapid development of China coal industry.