一、前言 随着采掘工作面向深部发展,煤矿的瓦斯突出危险性逐渐增大。最近煤矿较大的瓦斯爆炸灾害多半起因于瓦期的喷出与突出。这种瓦斯突出与喷出往往发生在掘进卷道。因此,为予防瓦斯突出,在打超前钻孔排放瓦斯的同时,设置了瓦斯自动警报器,采取了当达到规定的警报浓度时立刻切断井下电源 I. Introduction With the mining work facing the deep development, coal mine gas outburst danger increases. Most of the recent coal mine gas explosion disasters mostly caused by the discharge and highlight watts. This kind of gas outburst and outburst often occurs in the drifter winding. Therefore, in order to prevent gas outburst, while drilling pre-drilling gas drainage, gas automatic alarm is set to take when the provisions of the alarm concentration is taken immediately cut off underground power supply