Journal of Biosystems Engineering

Korean Society for Agricultural Machinery (한국농업기계학회)
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Experimental Evaluation of Percussion Performance for Rock-Drill Drifter

  • Seo, Jaho (Korea Institute of Machinery & Materials) ;
  • Park, Jin-Sun (Korea Institute of Machinery & Materials) ;
  • Kim, Heungsub (Korea Institute of Machinery & Materials) ;
  • Noh, Dae Kyung (Department of Mechanical Engineering, Graduate School, Gachon University)
  • Received : 2014.09.23
  • Accepted : 2014.12.19
  • Published : 2015.03.01
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Abstract

Purpose: The objective of this study was to understand the operating mechanism of the rock-drill drifter, to explain how to setup an experimental test system and measure the strain of the drifter's rod, and to evaluate the drifter's performance with respect to the impact energy and blow frequency. Methods: The structure of the rock-drill drifter and its operating principle regarding the impact process were analyzed. Static calibration was carried out to calculate the correction factor using a drifter rod as the first step of the experimental test. The impact energy and blow frequency were then calculated based on strain measurements of the drifter's rod. Results: Experimental results showed that the tested drifter elicited a blow frequency of 3330 BPM (Blows Per Minute) and generated impact energy of 170 J/blow. This indicates that the drifter elicits a higher percussion speed and results in a lower impact energy compared to the hydraulic breaker at the same input power. Conclusions: The study proposed methodologies that deal with the experimental setup and the evaluation of the performance of the rock-drill drifter. These methodologies can be extensively used for validating and improving the percussion performance of the drilling equipment.

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References

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