Research of Key Technologies for Mine Safety and Efficiency Monitoring

The paper put forward that safe and efficient coal mines should adopt advanced and reliable monitoring technology to be unmanned in fixed posts such as power supply, drainage, ventilation, air pressure, transportation, hoist, gas drainage and achieve remote control on the ground, and to be less personnel working on mechanized mining and mechanized caving coal faces and ground remote control. It proposed monitoring systems of power supply system, drainage system, ventilation system, air pressure system, transportation system, hoist system and gas drainage system should have function of ground remote control. It proposed coal mine scheduling command and controlling center with functions of remote control, alarm linkage and scheduling command. It proposed to integrate data centers of computer network room, SPC exchange room, dispatching switch room and monitoring system room. It put forward warning method of coal and gas outburst based on coal seam's gas pressure, gas content, integrated indicators, cutting gas desorption indicators, composite indicators, R-value indicators, gas emission(calculated according to the amount of gas concentration and air flow), roadway location, microseism, tone, temperature and their changes. It put forward mine wireless transmission interface based on WiFi to facilitate interconnection. It put forward temperature alarm method of coal spontaneous combustion with distributed optical fiber，which was more direct, timely and reliable than that using symbolic gas of coal spontaneous combustion like CO. It proposed to adjust speed of conveyor belt in real time according to coal quantity: the speed should be reduced when the quantity is small, and else the speed should be increased to improve transport efficiency and reduce equipment wear. It proposed power supply monitoring system based on fiber and integrated protection should have functions of anti grade-skip trip, ground remote setting and ground remote control to improve reliability of coal mine power supply and achieve unmanned underground electromechanical chamber. It put forward coal face monitoring system with following functions： identification of coal and rock; automatic drum increasing; interaction of shearer, scraper and hydraulic support machine; memory-based coal cutting；control of ground remote, crossheading short-range, manual control and emergency stop；top caving coal quantity and gangue control；fault diagnosis of shearer, scraper and other large electrical and mechanical equipments.