finger rotary detachable bit
麻花钻活钻头
The rotary carriage provides rotary and vertical motion to the drill string and bit.
转动滑架为钻柱和钻头提供转动和垂直移动。
The results show that longitudinal vibration of drill string is relative to rotary speed and weight on bit.
实验结果表明，钻柱的纵向振动主要与转速和钻压有关。
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