• ISSN 0258-2724
  • CN 51-1277/U
  • EI Compendex
  • Scopus
  • Indexed by Core Journals of China, Chinese S&T Journal Citation Reports
  • Chinese S&T Journal Citation Reports
  • Chinese Science Citation Database
Volume 29 Issue 6
Nov.  2016
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Article Contents
XU Hailiang, LI Wang, ZHAO Hongqiang, XU Shaojun. Influence of Gas Flow Resistance Loss upon Performance of Back-Reaming Pneumatic Impactor[J]. Journal of Southwest Jiaotong University, 2016, 29(6): 1198-1205. doi: 10.3969/j.issn.0258-2724.2016.06.021
Citation: XU Hailiang, LI Wang, ZHAO Hongqiang, XU Shaojun. Influence of Gas Flow Resistance Loss upon Performance of Back-Reaming Pneumatic Impactor[J]. Journal of Southwest Jiaotong University, 2016, 29(6): 1198-1205. doi: 10.3969/j.issn.0258-2724.2016.06.021

Influence of Gas Flow Resistance Loss upon Performance of Back-Reaming Pneumatic Impactor

doi: 10.3969/j.issn.0258-2724.2016.06.021
  • Received Date: 20 Jan 2015
  • Publish Date: 25 Dec 2016
  • In order to study the influence of flow resistance loss of gas upon the performance of a back-reaming pneumatic impactor, the complex gas path in the working impactor was simplified based on its structure and working principle, and the flow resistance loss of gas during the process was analyzed. Then, the changing characteristics of gas in the cavity of impactor were studied in presence of pressure loss, and a mathematical model for impactor's back-reaming operation was established. Based on the model, numerical simulations were conducted with a MATLAB program; and the pressure loss curve, the movement characteristics of piston and the law of pressure change in each cavity during the working process were obtained in presence of pressure loss. Results show that the flow resistance loss of gas will decrease the end speed of piston from 5.05 to 4.22 m/s and the impact frequency from 5.00 to 4.28 Hz, thus affecting the rock-breaking efficiency of impactor. In addition, the exhaust pressure of the impactor is only 0.140 MPa, which is lower than the designed value (0.185 MPa), leading to a poor performance of chip removal.

     

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