1) paddle reaming bit
翼状扩孔钻头
2) three wing back reamer
三翼回拉扩孔钻头
1.
The mechanical characteristics of the three wing back reamer used in guided boring in difficult formation is examined.
分析了导向钻进法用三翼回拉扩孔钻头在复杂地层条件下的力学性质 ,推导了计算不同岩石的最优切削角公式 ,并得出常见岩石的最优切削角值 ,进一步对回拉扩孔钻头的结构形式提出了优化 ,为导向钻进法回拉扩孔施工达到最优钻进 ,提供了必要的力学计算依
3) Ream bit
扩孔钻头
1.
When wind force cutting pick-up drilling is applyed in coal seam if dedusting equipment is installed in the opening of the bore,it should enlarge drilling bore with ream bit so that dedusting equipment can be installed,and then retreat drilling and replace bit of drill.
在煤层采用风力排渣打钻时,如果在钻孔孔口处安装除尘设备,在打钻前要采用扩孔钻头打一个能够安装除尘器的钻孔,然后退钻更换钻头钻进。
4) cylindrical wing-form bit
筒形翼状钻头
1.
The improved cylindrical wing-form bit has 18 diamond tungsten carbide composite button bits and 3 button bits more than the original drilling bit,with drilling cutters arranged according to the force on bit.
改进型筒形翼状钻头比原先使用的平底滚刀钻头增加了18个孕镶金刚石-针状硬质合金复合式钻齿和3个钎头,并按受力特点进行了合理分布。
5) near-bit reamer
近钻头扩孔器
6) diameter of ream bit
扩孔钻头直径
补充资料：回翼
1.盘旋而飞;回飞。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条