我们于1972年着手井下牙轮钻机的研制工作,1973年和长沙矿山研究院共同设计并自制成TYZ—300型钻机。在井下扩出φ400毫米的大孔,取得了一些试验数据。1974年自行设计并制成TYZ—500型钻机,进一步完善各种机构,缩小主机外形尺寸,在花岗岩、矽化砂岩条件下,钻φ216毫米孔,最高台班效率40米,扩φ500毫米孔最高台班效率18米,最大钻深90米,偏斜率大部分小于1％。 We started the research and development of downhole roller rigs in 1972. In 1973, we designed and produced the TYZ-300 drilling rig jointly with Changsha Mining Research Institute. In the underground expansion of φ400 mm large hole, made some experimental data. In 1974, TYZ-500 drilling rig was designed and made by ourselves to further improve various mechanisms and reduce the size of the mainframe. In the condition of granite and silty sandstone, φ216 mm holes were drilled, the highest efficiency of 40 meters and the maximum of φ500 mm holes Class efficiency of 18 meters, the maximum drilling depth of 90 meters, most of the skew rate less than 1%.