CCTEG Xi’an Research Institute，Xi’an ，China

针对顶板高位大直径定向钻孔施工过程中暴露的扩孔钻进效率低、钻具工作寿命短等问题,提出扭力冲击旋转扩孔技术与反向回拉扩孔技术。在分析现有扭力冲击器产品用于煤矿井下扩孔钻进可行性与反向回拉扩孔技术难点的基础上,完成了扭力冲击器的遴选与改造,研制了216/110 mm型反向回拉式扩孔器,实施了工艺探索试验。试验结果表明:扭力冲击器对于提升顶板高位定向钻孔扩孔效率效果显著,较常规扩孔技术机械钻速提升65%。研制的反向回拉扩孔器工作原理可行,动作可靠,保证回拉扩孔钻进效率的同时,改善扩孔钻具受力工况,对于提升扩孔钻具工作寿命具有积极意义。

In view of the problems of low drilling efficiency and short service life of the drill tools in the construction of large diameter roof directional drilling，this paper puts forward the technology of torsion impact rotary reaming and reverse pulling reaming.On the basis of analyzing the feasibility of the existing torque hammer products for reaming in coal mines and the technical difficulties of reverse broaching and reaming，the selection and modification of torque impactor were completed，and a reverse broaching reamer with ø216/110 mm type was developed，and the exploration test was carried out.The test results show that the torque impactor has remarkable effect on improving the reaming efficiency of the high directional hole in the roof，which is 65% higher than that of the conventional reaming technology.The developed reverse broaching reamer has the advantages of feasible working principle，reliable operation，ensuring the efficiency of broaching and reaming，and improving the working condition of reaming drill tools，which has positive significance for improving the service life of reaming drill tools.

国家科技重大专项资助项目(2011ZX05041-001)；煤炭科学研究总院技术创新基金资助项目(2016ZYMS015)；中煤科工集团西安研究院有限公司技术创新基金资助项目(2018XAYZD01)；