部分断面掘进机截割头截割性能研究

Research on Cutting Performance of Cutting Header on Part-face Roadheader

截割头是掘进机直接实现截割功能的关键部件,其设计在一定程度上直接决定了整机的性能。采用混凝土制作煤岩,对自制煤岩进行单轴压缩试验,确定其抗压强度和弹性模量。针对掘进机截割煤岩过程的复杂性,以部分断面掘进机截割头为研究对象,基于单轴压缩试验所确定的物理参数,利用动力学有限元软件LS-DYNA建立截割头截割煤岩过程仿真模型,探讨了截齿切削角和旋转角对截割载荷、载荷波动和截割比能耗的影响规律。由仿真结果可知,当截齿的切削角在48°~50°范围,旋转角在12°~16°范围时,截割头的截割能力较佳;将由试验确定的自制煤岩截割力矩时域曲线与仿真结果进行对比,验证了所建立的仿真模型的正确性。上述研究为部分断面掘进机截割头截割性能的改善提供了理论基础,同时为其他类型截割或切削问题的研究提供了理论借鉴。

The cutting head is the main part employed by a roadheader for cutting, and its design directly determines the performance of a roadheader to some extent. The uniaxial compression experiment is carried out on the homogeneous coal rock made by the concrete, and then the compressive strength and elastic modulus of the coal rock are obtained. Aimed at the complexity of the process of cutting coal rock in a roadheader, the cutting head of a part-face tunnel machine is studied. Based on the physical parameters determined by the uniaxial compression experiment, the dynamic finite element software LS-DYNA is used to model the cutting head of the cutting machine, and then the effects of cutting angle and rotation angle on the cutting load, load fluctuation and specific energy are investigated. By the comparison between the time-domain curve of the cutting moment obtained from the homogeneous coal rock by experiment and the simulation results, and the simulation model is verified. The above research provides a theoretical basis for the improvement of the cutting performance of the cutting head of part of the roadheader, and provides a theoretical reference for the research of other types of cutting or cutting.