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液压凿岩机日本专利No.50-52196 液压缸里活塞的前后压力面的面积不同,其中前压力面面积大于后压力面。在液压缸体内壁或在活塞上具有一道槽,用以通过工作液。工作液的换向由阀门实现。活塞压力面对面的汽缸体是加厚的。风动凿岩机的消音器苏联专利No.2612078 风动凿岩机消音器是用弹性材料制成的带有球面斜面的圆柱形壳体。它是一个带缝的腔室。采用使废气排出大气的方法来提高消音效
Hydraulic rock drill Japan Patent No. 50-52196 hydraulic cylinder piston front and rear pressure surface area is different, wherein the front pressure surface area greater than the rear pressure surface. A groove is provided in the inner wall of the cylinder body or on the piston for passage of working fluid. The reversal of the working fluid is achieved by the valve. Piston pressure face-to-face cylinder block is thickened. Silencer for Pneumatic Rock Drill Soviet Patent No. 2612078 Pneumatic Rock Silencer is a cylindrical housing made of an elastic material with a spherical bevel. It is a stitched chamber. Use of exhaust emissions from the atmosphere to improve sound-deadening effect