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气动凿岩机的噪声源有:排气噪声;活塞撞击钎尾、钎杆钎头与岩石的撞击以及机器本身振动产生的噪声。排气噪声是噪声的主要来源,估计排气噪声在凿岩作业的总噪声能量中占87～94%。排气噪声产生的原因是由于高速而周期性地向相对静止的大气中排放压缩气体,然后互相混和,产生一种宽频带的无规则噪声。要想使凿岩机的总体噪声显著下降,首先要降低排气噪声。目前,国外一些新型的气动凿岩机都具有消声结构,可是大量正在矿山使用的旧式气动凿岩机却没有消声装置。美国矿业局和
Pneumatic rock drill noise sources are: exhaust noise; piston impact drill tail, drill bit and the impact of rock and the vibration of the machine itself, the noise generated. Exhaust noise is the main source of noise and it is estimated that exhaust noise accounts for 87-94% of the total noise energy of the rock drilling operation. Exhaust noise is generated due to the high speed and periodic discharge of compressed gas into a relatively static atmosphere, which are then mixed with each other to produce a wide band of random noises. To significantly reduce the overall noise of the rock drill, first of all to reduce exhaust noise. At present, some new foreign pneumatic rock drills have a silencer structure, but a large number of old pneumatic rock drills that are being used in mines do not have a silencer. US Bureau of Mines and