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为了评价不同螺旋线数纵轴式截割头的截割性能,在截割头形体尺寸、总截齿数、截齿及齿座型号完全相同的情况下,建立了按2条螺旋线排列的截割头(2LC型)和按3条螺旋线排列的截割头(3LC型)模型,通过编制程序进行模拟,并从切屑块度、受载大小及同时参与截割的有效截齿数变动量3个方面进行分析对比。由模拟图及相应的计算结果可知,3LC型截割头的平均切屑面积较2LC型的平均切屑面积大0.52%,且2LC型截割头球面段的截齿剥落下来的岩石崩落效果不佳,易产生粉尘。与2LC型截割头相比,3LC型截割头的载荷变差系数及有效截齿变差系数均较小,因此其载荷稳定性好。分析得出的结论为截割头截齿排列的优化设计奠定了一定的理论基础。
In order to evaluate the cutting performance of the vertical axis cutting heads with different numbers of helical threads, the cut-off head shape, the total number of picks, Cutting head (model 2LC) and model 3LC (3LC model) arranged in three spirals were simulated by programming and the change of effective number of picks from chip size, load size and cutting involved The aspects of analysis and comparison. From the simulation results and the corresponding calculation results, the average chip area of the 3LC cutting head is 0.52% larger than the average chip area of the 2LC type, and the rock caving effect of the splinter of the 2LC cutting head is not good , Easy to produce dust. Compared with the 2LC-type cutting head, 3LC-type cutting head load coefficient of variation and the effective coefficient of variation is small, so the load stability. The conclusion obtained by the analysis has laid a theoretical foundation for the optimal design of the cutting head pick arrangement.