Characteristics of coal mine accidents and new technologies of coal mine communication, personnel positioning and monitoring

The paper analyzed characteristics of gas, water and roof accidents of coal mine during 2009-2013, obtained numbers of accidents and deaths accounted for 78.54% and 78.80% respectively at mining working face of the most accidents. It put forward mobile communication, broadcast communication and rescue communication system should not be used as mine emergency communication system, and through-the-earth communication system could be used as mine emergency communication system with low performance-price ratio. It proposed wired dispatching communication system used as mine emergency communication system has advantage of high performance-price ratio. In the wired dispatching communication system, cable should be buried under laneway sidewall crossover with roadway floor, underground telephone should be set in chamber with stronger protection, and cable joint should be reduced and waterproof performance of the cable joint should be improved. It analyzed problems of wisdom line communication in underground coal mine, which include short transmission distance without repeater, power supply distance restricted by intrinsic safety and explosion-proof, easily occurs short-circuit fault, and it cannot be used for backbone transmission with large capacity and its outer sheath is not resistant to explosion.