The axial flotation of chuck plays an important role in the protection of rod pipe threads and prevention of rod pipe stripping or cutterhead from dropping during the process of raise boring.
在天井钻进过程中，卡盘的轴向浮动对保护钻杆螺纹和防止钻杆脱扣、刀头坠落等方面具有重要作用。
Since 1970s China has successively developed TYZ type and AT type raise borers and achieved remarkable results in raise boring.
我国从七十年代以来，相继研制成功了TY Z型和AT型天井钻机，在天井钻进中取得了显著的效果。
The said incline raise borer, developed by Changsha Institute of Mining Re-search for incline raise boring in dip onebody mining, is the first generation product in Chi-na.
为了解决倾斜矿体开采中斜天井掘进问题，我院新开发了我国第一代斜天井钻机产品。
The authors describe design of deep raise boring equipment and the experimental study on boring technology, and make an approach to some problems occurring in the deep raise boring test.
叙述了深天井钻进设备的设计和钻进工艺的试验研究，并对深天井钻进试验中遇到的一些问题进行了探讨。
Some Speed lifting Systems of domestic raise-boring machines are described. Based upon an analysis of their functions, some recommendations for their improvement are proposed.
本文介绍了国内天井钻机的几种快速升降系统及其作用并对其进行了分析，提出了改进建议。
Some Speed lifting Systems of domestic raise-boring machines are described. Based upon an analysis of their functions, some recommendations for their improvement are proposed.
本文介绍了国内天井钻机的几种快速升降系统及其作用并对其进行了分析，提出了改进建议。
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