【摘要】 破岩效率是衡量滚刀破岩性能的关键指标。文章基于离散单元法建立边缘滚刀破岩仿真模型,采用多因素正交设计法进行了边缘滚刀破岩过程试验,以破岩效率为边缘滚刀破岩性能的评价指标,研究了刀刃角、刀刃宽、安装倾角与刀盘过渡圆弧半径对滚刀破岩效率的影响规律,并针对大理岩和混凝土两种不同切削对象分析了各因素单独作用对边缘滚刀破岩效率的影响规律。试验结果表明:倾角对边缘滚刀破岩效率的影响十分显著,圆弧半径和刀刃角的影响次之,刀刃宽的影响最小;各因素对不同岩石的破岩效率影响规律不同,安装倾角和刀盘过渡圆弧半径对大理岩和混凝土的破岩效率影响相同,而刀刃角和刀刃宽对两者的影响则相反。最后,通过实验发现安装倾角为4°时的破岩效率约为8°时的1.8倍,验证了安装倾角对边缘滚刀破岩效率影响很大的规律。更多还原

【Abstract】 Rock-breaking efficiency is a key indicator for measuring the performance of a disc cutter. In this paper, a rock-breaking simulation model of the gauge disc cutter is established based on the discrete element method, and rock-breaking tests of the gauge disc cutter are performed through the multi-factor orthogonal design method. Meanwhile, by taking rock-breaking efficiency as the evaluation indicator for rock-breaking performance of the gauge disc cutter, it studies the effects of the angle of the cutter blade, width of the blade tip, installation angle, and transition radius of the cutterhead on rock-breaking efficiency, as well as the effects of each of those factors on marble breaking and concrete breaking respectively. It is thought that the effects of the installation angle on rock-breaking efficiency are significant, less so for the transition radius of the cutterhead and angle of the cutter blade, and minimal for the width of cutter blade. The effects of each factor on rock-breaking efficiency are different for different rock types. Effects of the installation angle and transition radius on marble-and concrete-breaking efficiency are the same, while the effects of the angle and width of the blade tip are opposite of each other. Experiments show that rock-breaking efficiency increases by 80% when the installation angle is adjusted from 8° to 4°, verifying the rule that the effects of the installation angle of the gauge disc cutter are significant on rock-breaking efficiency.更多还原