论文部分内容阅读
现在我想就目前掘进工作所用之合金活钎头的双侧孔提出我的意见，供大家讨论。活钎头双侧孔有以下一些缺点：（一）活钎头双侧孔在工作面形成一水力圈不能很好冲洗工作面。
Now I’d like to put forward my opinion on the bilateral holes of the alloy brazing heads used in the current tunneling work for our discussion. Live bit both sides of the drill hole has the following disadvantages: (A) live bit both sides of the hole in the work surface to form a hydraulic circle can not be well washed the face.