Study on full process precision control technology of coal wall under large mining height intelligent mining condition

In view of the current situation of intelligent mining of coal wall in the Huangling Mining Area and similar working face, especially in early warning and intelligent control, considering the differences between the intelligent mining and the comprehensive mechanized mining process, the intelligent mining coal wall control scheme was designed based on three stages of prevention, development and protection and the aspects such as design, working surface equipment parameter determination, maintenance parameter optimization, sensor scheme and control scheme. The hydraulic support mechanism and the control method of the guard were optimized, and the face guard structure precision control technology was designed. Wall caving forwarding model was established, and the working face wall caving protection system was put forward combining video monitoring, Tera Hertz scanning and personnel location.This technology, combined with the working surface protection system of the centralized control system of the working face equipment, the precise control technology for the full process of intelligent mining of the rib spalling with large mining height was formed. The control technology was incorporated into the intelligent mining control system of the working face, which effectively solved the problem of intelligent mining coal rib control. The support worker was reduced from five operators to unmanned operation with one person as patrol. In Huangling No.2 Mine, the intelligent mining of large mining height was successfully implemented, and the annual output of the working face reached 6 million tons.