论文部分内容阅读
井筒掘进大多采用风动工具凿岩及抓岩机出矸,风动凿岩机所产生的噪声有87.4％为排气噪声,有12.6％为活塞冲击钎尾、钎头冲击岩石以及机体的振动与摩擦所产生的冲击噪声与机械噪声。风动凿岩机总噪声频谱较宽,是属于具有低频、中频及高频成分的广谱声;排气噪声频谱呈中、低频特性,即噪声频率在250Hz左右时其噪声声级最高,可达120dB(A)以上。由于凿井作业可使用的风动工具噪声很高,在井筒掘进中使用现有矿用防爆电话难以通话,有时不得不派人上下井联络,影响
Most of the wellbore excavation uses wind-driven tools to drill rock and catch the rock out of the rock. 87.4% of the noise produced by the rock-mounted rock drill is exhaust noise, 12.6% is the impact of the shank of the piston, the rock against the bit and the vibration and friction of the body The resulting impact noise and mechanical noise. The total noise spectrum of pneumatic rockdrill is broad, which belongs to the broad spectrum sound with low frequency, middle frequency and high frequency components. The exhaust noise spectrum shows medium and low frequency characteristics, that is, the noise level is the highest when the noise frequency is about 250Hz, up to 120dB (A) above. Due to the high noise of pneumatic tools used in shaft drilling operations, it is difficult to communicate with the existing mining explosion-proof telephone in wellbore excavation. In some cases, it has to be brought in and out of the well to affect well