Journal of the Korean Society for Geothermal and Hydrothermal Energy (한국지열·수열에너지학회논문집)

Korean Society for Geothermal and Hydrothermal Energy (한국지열·수열에너지학회)
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Experimental Study on the Performance Characteristics of Geothermal DTH Hammer with Foot Valve

풋 밸브가 적용된 지열 천공 DTH 해머의 성능 특성에 대한 실험적 연구

  • Cho, Min Jae (Production Management Department, SIMWON Develope Co.) ;
  • Sim, Jung-Bo (School of Mechanical Engineering, Hanyang University, Smart Energy and Nano Photonics R&D Group, Korea Institute of Industrial Technology) ;
  • Kim, Young Won (Smart Energy and Nano Photonics R&D Group, Korea Institute of Industrial Technology)
  • 조민재 ((주)심원개발 생산관리부) ;
  • 심정보 (한양대학교 기계공학부, 한국생산기술연구원 스마트에너지나노융합연구그룹) ;
  • 김영원 (한국생산기술연구원 스마트에너지나노융합연구그룹)
  • Received : 2021.02.16
  • Accepted : 2021.02.27
  • Published : 2021.03.01
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Abstract

Drilling equipment is an essential part used in various fields such as construction, mining, etc., and it has drawn increasing attention in recent years. The drilling method is generally divided into three types. There are a top hammer method that strikes on the ground, a DTH (Down-The-Hole) method that directly strikes a bit in an underground area, and a rotary method that drills by using rotational force. Among them, the DTH method is most commonly used because it enables efficient drilling compared to other drilling methods. In the conventional DTH hammer, the valve between the piston and the bit is opened and closed using a face to face method. In order to improve the power of the DTH hammer, a DTH hammer with foot valve which is capable of instantaneous opening and closing is used in the drilling field. In this study, we designed a lab-scale DTH hammer with the foot valve, and manufactured an evaluation device for the experiment of the DTH hammer. In addition, we analyzed the performance of the DTH hammer adopted with foot valve according to the pressure range of 3-10 bar. As a result, the internal pressure distribution in the DTH hammer was experimentally analyzed, and then, the movement of the piston according to the pressure was predicted. We believe that this study provides the useful results to explain the performance characteristics of the DTH hammer with the foot valve.

Keywords

References

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