• Corpus ID: 133657091

Drill stem with internal powder discharging function

@inproceedings{2015DrillSW,
  title={Drill stem with internal powder discharging function},
  author={郭文亮 and 田富强 and 徐灵岩 and 宫晓琴 and 郭政 and 张杰 and 武利生 and 韩念琛},
  year={2015}
}
The invention discloses a drill stem with an internal powder discharging function. The drill stem comprises a front segment, a rear segment and a drill bit, wherein the drill stem is hollow, a tapered internal thread is arranged at the head part of the front segment of the drill stem, a tapered external thread is arranged at the tail part of the front segment of the drill stem, nozzles are uniformly arranged in a center hole of the front segment of the drill stem, and the nozzles are inclined…