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长期以来,在采矿工业方面的风动凿岩方法,主要有回转式、冲击式和回转冲击式三种。回转凿岩适用于软岩钻进。岩石超过了一定的硬度,如仍用回转式凿岩,就需要把推进力加大,因而就要安装大型复杂的机器。另外,钎头磨损非常快,达到无法补救的地步。因此,长期以来,在坚硬岩石凿岩采用冲击式。冲击式凿岩的优点是钎头磨损极小,其缺点是钻进速度远不及回转式凿岩的速度。回转冲击式凿岩是在回转钻进的同时又连续冲击破碎岩石,它兼有回转式钻进和冲击式钻进两者的优点,产生较高的的钻孔速度,而不必加过大的推进力,钎头的磨损也不严重。五十年代初期,西德鲁尔煤矿开始使用风动回转冲击式凿岩机钻孔,钻进速度比一般的风动冲击式凿岩机提高将达两倍,但是它的风量消耗却要增加三倍。
For a long time, in the mining industry, the rock drilling method, there are three types of rotary, impact and rotary impact. Rotary rock drilling for soft rock drilling. Rock exceeds a certain hardness, if still use rotary drilling, you need to increase the propulsion, it is necessary to install large and complex machines. In addition, the bit wear very fast, reaching the point where it can not be remedied. Therefore, the impact type has been used for hard rock drilling for a long time. The advantage of percussive rock drilling is the extremely small wear of the drill head. The disadvantage is that the drilling speed is far less than the speed of rotary rock drilling. Swing impact rock drilling is continuous and continuous impact rock crushing, which combines the advantages of both rotary drilling and percussion drilling, resulting in a higher drilling speed, without having to be too large Propulsion, bit wear is not serious. In the early 1950s, the Westdelung coal mine began drilling with a pneumatic rotary rock drill, which doubles its drilling speed by up to three times the rate of a conventional pneumatic rock hammer, but its air flow consumption is tripled.