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.
本文着重介绍了天井钻机卡盘轴向浮动量的计算方法，并附有实例。
This paper placed emphasis on the introduction of the calculating method for the axial flotation value in raise-borer chuck and some examples were also given for further illustration.
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