• 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}
}

• 郭文亮, 田富强, +5 authors 韩念琛
• Published 12 November 2015
• Materials Science

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 and are mounted corresponding to water holes formed in the drill stem; the rear segment of the drill stem comprise a plurality of short rods adopting the same structure, a tapered internal thread is arranged at the head part of each short rod, a tapered external thread is arranged at the tail part of each short rod, the short rods are connected with one another through the tapered threads, a sealing ring is arranged at the joint of every two adjacent short rods, and water holes are formed in the short rods, and communicate with those in the front segment of the drill stem; and the front segment of the drill stem is connected with the drill bit, the drill bit is shaped like a stepped taper, the water holes are just aligned after the front segment of the drill stem is fastened with the short rods of the rear segment of the drill stem, and high-pressure water is introduced into the end parts of the water holes of the rear segment of the drill stem. Through adoption of the drill stem with the internal powder discharging function, provided by the invention, the hole-forming rate can be improved, the hole-forming shape can be kept, and the incidence of such accidents as hole collapse and drill wedging can be reduced in a drilling process.