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在矿山岩石中所钻凿的小直径孔一般用于爆破、钻探、排气、放水等目的。小直径孔在煤矿中的钻凿量日益增加。但是,一般钻机的工作效率较低,其中在硬岩(f>8)中的凿孔效率也不过每班5～6m,因而影响了回采工作面的推进速度。而用液压冲击器(表1)进行回转冲击凿岩,可强化在硬岩中的凿岩过程,提高凿孔效率,从而提高工作面的掘进速度。液压冲击器的工作效率,在从地面上钻凿钻探孔的实践中得到了证明。为确定液压冲击器在矿山条件下的工作效率和明确使用现有凿岩设备的可能性,顿
Small diameter holes drilled in mine rocks are commonly used for blasting, drilling, venting, and drainage purposes. Small diameter holes are increasingly drilled in coal mines. However, the working efficiency of general drilling rigs is relatively low, among which the drilling efficiency in hard rock (f> 8) is no more than 5 ~ 6m per class, thus affecting the propulsion speed of mining face. The use of hydraulic impactor (Table 1) rotary impact rock drilling, can enhance the rock in the hard rock drilling process to improve the efficiency of drilling, thereby increasing face heading speed. The working efficiency of the hydraulic impactor has been proved in the practice of drilling a drilling hole on the ground. In order to determine the working efficiency of the hydraulic impactor under mining conditions and the possibility of using the existing rock drilling equipment explicitly,