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<p>Currently, rectangular full-face tunnel boring machines (TBMs) for coal mines are faced with multiple challenges, including complex structures, difficulties in achieving full-face one-time cutting, and unclear cutting characteristics. Aiming at tackling these challenges, firstly, a Reuleaux triangle cutterhead (RTC) driven by an eccentric shaft and a planetary gear and characterized by a simple structure was designed, the difference rates of theoretical section and motion simulation section were 3.18% and 5.09%, respectively, compared to a standard square. Secondly, in order to explore the cutting characteristics of the RTC, a test bench for full-face rectangular cutting was constructed and multiple groups of stable cutting tests were carried out. The test results indicate that, the incorporation of a central fishtail cutter leads to a modest increase in the hydraulic cylinder oil pressure and torque required for cutting, by 4.058% and 3.652%, respectively. However, it contributes to a substantial reduction in vibrations along the X-, Y-, and Z-axes, with reductions ranging from a minimum of 42.107% to a maximum of 51.753%. Moreover, eleven groups of stable cutting tests were performed under different cutting parameters and the relationship diagrams between torque/oil pressure and these cutting parameters were plotted. An economical cutting parameter region for the equipment was proposed. Specifically, this region was determined to be <i>n</i><sub>(N-p)min</sub> = [6.6, 9.8] r/min and <i>v</i><sub>(N-p)</sub>min = [10.2, 18.3] mm/min for the experimental setup under test conditions. Finally, three-dimensional scanning and reconstruction of the post-cutting rock specimen sections further confirmed that the actual cutting cross section of the RTC aligns with the theoretical cross section, Fig. difference rate was 6.64%. The above research provides a theoretical basis for the design of the cutterhead of the full-section rectangular roadheader, and provides a test reference for the engineering application of the full-section rectangular roadheader.</p>

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Design and experimental study of eccentric shaft planetary gear drive Reuleaux triangular cutterhead full-section rectangular tunnel boring machine

  • 期刊论文

  • 发表日期：

    2026年2月2日

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  • Qiang Li,
  • Songyong Liu,
  • Yan Wang

摘要

Currently, rectangular full-face tunnel boring machines (TBMs) for coal mines are faced with multiple challenges, including complex structures, difficulties in achieving full-face one-time cutting, and unclear cutting characteristics. Aiming at tackling these challenges, firstly, a Reuleaux triangle cutterhead (RTC) driven by an eccentric shaft and a planetary gear and characterized by a simple structure was designed, the difference rates of theoretical section and motion simulation section were 3.18% and 5.09%, respectively, compared to a standard square. Secondly, in order to explore the cutting characteristics of the RTC, a test bench for full-face rectangular cutting was constructed and multiple groups of stable cutting tests were carried out. The test results indicate that, the incorporation of a central fishtail cutter leads to a modest increase in the hydraulic cylinder oil pressure and torque required for cutting, by 4.058% and 3.652%, respectively. However, it contributes to a substantial reduction in vibrations along the X-, Y-, and Z-axes, with reductions ranging from a minimum of 42.107% to a maximum of 51.753%. Moreover, eleven groups of stable cutting tests were performed under different cutting parameters and the relationship diagrams between torque/oil pressure and these cutting parameters were plotted. An economical cutting parameter region for the equipment was proposed. Specifically, this region was determined to be n(N-p)min = [6.6, 9.8] r/min and v(N-p)min = [10.2, 18.3] mm/min for the experimental setup under test conditions. Finally, three-dimensional scanning and reconstruction of the post-cutting rock specimen sections further confirmed that the actual cutting cross section of the RTC aligns with the theoretical cross section, Fig. difference rate was 6.64%. The above research provides a theoretical basis for the design of the cutterhead of the full-section rectangular roadheader, and provides a test reference for the engineering application of the full-section rectangular roadheader.