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根据长沙矿山研究院、瑶岗仙钨矿、下垄钨矿等研制天井钻机的经验,我矿于1975年自制成功了TYZ-500K型天井牙轮机。几年来,共钻进φ215毫米超前孔750米,φ500毫米扩孔650米。与传统天井掘进法相比,减少工程量50％,降低了费用,解决了防尘问题,使作业更加安全。以往钻进的天井高度一般为一个中段,即45～50米。这种施工方法的缺点是,钻机搬迁频繁、架设麻烦,尤其是中段间的移设更为困难。耗费时间为正常钻进作业的3～4倍,限制钻机效率的发挥。
According to the Changsha Mining Research Institute, Yao Gangxian tungsten ore, tungsten ore and other under the development of mine drilling experience, I mine in 1975 made a successful TYZ-500K-type patio tooth machine. In recent years, a total of φ215 mm advance hole drilled 750 meters, φ500 mm reaming 650 meters. Compared with the traditional law of tunneling, reduce the amount of construction 50%, reducing costs, to solve the dust problem, making work more secure. In the past, the height of a well drilled was generally a middle section, that is, 45 to 50 meters. The disadvantage of this construction method is that the drilling rig is frequently relocated and troublesome to set up. In particular, it is more difficult to move between the middle sections. Spending time for normal drilling operations 3 to 4 times, limiting the efficiency of drilling play.