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在硬煤巷道掘进中,必须时刻注意甲烷与空气混合气体出现易燃的情况。截齿一般不会有引起燃烧的危险,由于截齿材料的融点关系,其形状和可能达到的表面温度引起燃烧的可能性非常小。真正的引燃危险来自切割轨迹中的高温,这是切割时岩粉氧化和预热所致。氧化需有一定的反应时间,因而最危险的引燃源是在温度高至工400℃和齿尖后方20～30mm的切割轨迹处。截齿的周围状况等决定了引燃危险的程度。当速度低于
In hard coal tunneling, we must always pay attention to methane and air mixture flammable conditions. There is generally no risk that the pick will cause combustion. Due to the melting point of the pick material, the shape and possible surface temperature are very unlikely to cause combustion. The real ignition hazard comes from the high temperature in the cutting path, which is caused by oxidation and preheating of rock dust during cutting. Oxidation requires a certain reaction time, and thus the most dangerous source of ignition is at a cutting trajectory at temperatures up to 400 ° C and 20-30 mm behind the tooth tip. The situation around the pick determines the degree of ignition hazard. When speed is below