天井钻进法是我国矿山于80年代推广应用的天井掘进新方法。
The raise boring is a new raising method deployed in China's mines in1980s.
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。
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.
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。
Since 1970s China has successively developed TYZ type and AT type raise borers and achieved remarkable results in raise boring.
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