液压凿岩机冲击器由工作缸(包括蓄能器)和液动阀两部分组成(参看图1a),是一种具有位置反馈的阀控油缸系统。冲击器工作时,控制阀从缸壁反馈孔获得液控油推动滑阀换向,以实现油路切换,活塞则随供油规律的改变作有节凑的变速运动。控制阀大部分时间处于全开口情况下工作。实验表明:活塞回程时,控制阀动作时间约为回程时间的7/8;活塞冲程时,约为冲程时间的4/5。控制作用是在特定位置(由反馈孔位 Hydraulic rock drill impactor by the working cylinder (including the accumulator) and the hydraulic valve is composed of two parts (see Figure 1a), is a position feedback valve control cylinder system. When the impactor work, the control valve from the cylinder wall feedback hole to obtain pilot-controlled oil to promote the spool valve to switch, in order to achieve the oil switch, the piston is with the change of the oil for the minivan variable speed movement. Most of the control valve in full opening work. Experiments show that: the piston return stroke, the control valve operating time is about the return time of 7/8; piston stroke, about stroke time 4/5. The control effect is at a specific position (by the feedback hole