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随着矿井生产的不断发展,岩巷掘进工作面离地面压风机站距离越来越远,压缩空气通过长距离管道输送,压力损失较大,从而降低了凿岩机的效率,影响掘进速度。日本古河矿业公司,用D95型风动凿岩机,在花岗岩上,用各种直径的钻头,在各种风压下进行凿岩试验,求得的数据如图1所示。如使用直径42mm钻头,风压6bar时,钻速为760mm/min;若风压降至4bar,则钻速降至540mm/min,钻速下降了30%。气腿式凿岩机额定风压为6～7bar,为保证掘进头有足够的风压,有两种办法:一是在井下掘进工作面附近装设移动式压风机站;二是装设压缩空气升压机。美国、加拿大和瑞典等国都生产有螺杆
With the continuous development of mine production, the working face of rock tunneling moves farther and farther away from the surface pressure air blower station. The compressed air is transported by long-distance pipeline, resulting in great pressure loss, which reduces the efficiency and affects the speed of rock drilling. Japan Furukawa Mining Company, with D95-type pneumatic rock drill, granite, with a variety of drill bits, under various wind pressure drill test, the data obtained as shown in Figure 1. For example, if the diameter is 42mm, the drilling speed will be 760mm / min when the wind pressure is 6bar; if the wind pressure drops to 4bar, the drilling speed will drop to 540mm / min and the drilling speed will drop by 30%. Air leg rock drill rated wind pressure is 6 ~ 7bar, in order to ensure that the tunneling head has enough wind pressure, there are two ways: First, the face of the underground tunnel face mounted mobile pressure blower station; the second is equipped with compressed air l press. The United States, Canada and Sweden and other countries have produced a screw