Research on double-stage double-speed reaming drill bit for high-position and large-diameter drilling in coal mine roof
The two-stage and two-speed reaming technology can realize one time efficient reaming for the high position and large diameter directional drilling of coal mine roof, and overcome the limitations of conventional forward multistage reaming technology and method, such as heavy drilling workload, long...
| الحاوية / القاعدة: | Meikuang Anquan |
|---|---|
| المؤلفون الرئيسيون: | , , |
| التنسيق: | مقال |
| اللغة: | الصينية |
| منشور في: |
Editorial Office of Safety in Coal Mines
2023-09-01
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| الموضوعات: | |
| الوصول للمادة أونلاين: | https://www.mkaqzz.com/cn/article/doi/10.13347/j.cnki.mkaq.2023.09.026 |