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随着采矿事业的发展,凿岩爆破工作的需要,研究和推广新型的、高效率的凿岩工具具有现实意义。目前,我国对牙轮和潜孔的凿岩方法开展了试验研究工作,并取得了一定的效果;在国外,特别是美国和苏联,又在牙轮和潜孔钻具的基础上,研究和试验了一种新型的钻具——联合钻具。这种钻具是由牙轮钻头和气体冲击器上的一字形单刃或多刃钻头组成的。据有关资料介绍,联合钻具适用在普氏硬度f=8～16的岩石中钻孔工作,在中硬岩石中牙轮钻头采用普通楔形齿,在硬岩或极硬岩石中采用球形齿。苏联在1956～1957年间,由斯克契思克矿业研究所
With the development of the mining industry and the need of drilling and blasting, it is of great significance to study and popularize new and efficient rock drilling tools. At present, China carried out experimental research on the rock drilling method of cone and down-hole, and achieved certain results. In foreign countries, especially the United States and the Soviet Union, on the basis of cone-roller and down-hole drilling tools, A new type of drilling tool was tested. This drill is a roller cone bit and gas impact on the single-blade or multi-blade bit composition. According to the relevant information, the joint drill is suitable for drilling in rocks with a hardness of f = 8-16, while the common type of rock cone bit is used in hard rock, and spherical teeth are used in hard rock or very hard rock. The Soviet Union in 1956 and 1957 by the Skisksk Mining Research Institute