| 1. | The improvement of ky - 150 type rotary drill travel unit
150型牙轮钻机行走部改造 |
| 2. | Speed regulating of gear wheel rigs by frequency conversion
牙轮钻机变频调速 |
| 3. | 14 drilling with cone ( drag ) bit in the section
此段地层采用牙轮（刮刀）钻头钻进。 |
| 4. | The personal computer control system for roller drill
牙轮钻机微机控制系统 |
| 5. | Create the 3d models of three cones . 6
对三个牙轮进行了三维实体造型。 |
| 6. | Contact stress analysis on the bearing of single - cone bits
单牙轮钻头轴承接触应力分析 |
| 7. | The computer simulation model study of singular one - cone bit
异形牙轮单牙轮钻头的计算机仿真模型研究 |
| 8. | Study on pz modular roller - cone bit and rock drilling technology
系列组合牙轮钻头及其嵌岩技术的研究 |
| 9. | Industrial test method of open - cut mine rotary blast hole drill
露天矿用牙轮钻机和旋转钻机工业试验方法 |
| 10. | Analysis of the factors of the cutting efficiency about single - cone bit
影响单牙轮钻头切削效率的原因分析 |
