锥形截齿旋转破岩截割力预测方法试验研究

Experimental study on rock cutting force by rotational moving for coal mining equipment conical pick

为分析煤矿采掘装备截齿绕截割头轴线旋转时截割力随切削深度的变化情况，介绍了在截齿作用下岩石破碎的3种形式和基于直线型截割试验的法向力和切向力预测公式。在截齿旋转破岩试验平台上，对单向抗压强度为61．8MPa的岩石进行最大切削深度为5mm的定相关截割试验。试验结果显示，岩体在截齿作用下的失效形式为跃进式破碎，截割力变化与岩屑几何尺寸对应。对试验数据进行回归分析发现，法向力和切向力与切削深度线性相关，受截槽结构对称的影响，侧向力与切削深度相关程度较低。在1～5mm切割深度条件下对试验岩石样本建立了截割力3个分量的回归方程，并解释试验测定中峰值法向力逐渐降低的原因。试验过程表明，通过截齿旋转破岩试验能够在最大程度上模拟截齿绕截割头旋转破岩的实际截割过程。

In order to analyze variation of the cutting loads by cutting depth on conditions of pick turn around the axis of Coal mining equipment cutting head,introduced three kinds of rock eutting types by pick and the predictive formulas of normal force and cutting force based on Linear Cutting Machine.The relieved cutting test were performed with the rock uniaxial compressive strength was 61.8 MPa and the maximum cutting depth was 5 mm on rotating cutting machine.Experimental results showed that the failure of rock by picks was leaping crash, and the variation of the cutting loads corresponding with the geometry of chips.The normal force and the cutting force was correlalion with cutting depth by regression analysis,and the side force was uncorrelation with the cutting depth since symmetrical cuter grooves.The regression equation of three components of cutting loads were established with cutting depth form 1 mm to 5 mm, and the reason of peak normal force reduce was expounded. It was proved that the rock cutting test on rotating cutting machine could simulate the actual work process of pick on cutting head.