Design of Mine-used Safety Protection Device for Preventing Fire during Drilling

In order to prevent high concentration of CO and gas explosion caused by spontaneous combustion of coal during drilling for coal seam gas drainage, the paper proposed a design scheme of mine-used safety protection device for preventing fire during drilling. The device monitors concentration of CO and gas by sensors, and uses single-chip microcompute to achieve automatic switching of high-pressure air and pressure water. Field tests show that the device can realize automatic switching of high-pressure air and pressure water and crush out burning coal when spontaneous combustion occurs during drilling.