我们从1978年开始研究阀式液动冲击器，1979年先后试制了五台直径为50毫米的双作用阀式液动冲击器，用直径为58毫米普通中八角柱状合金钻头，在杨柳坪矿区ZK172孔进行了钻进试验，并在该孔和其他几个孔中进行了扩孔和处理事故。尽管完成的工作量不多，但取得了较好的技术经济效果。我队采用的小 We started to research the valve type hydraulic impactor in 1978. In 1979, we successively produced five double-acting valve type hydraulic impactor with a diameter of 50mm. With a diameter of 58mm ordinary octagonal cylindrical alloy drill bit, ZK172 hole drilled test, and in the hole and several other holes were reaming and handling accidents. Despite the small amount of work done, but achieved good technical and economic results. My team used a small