不同截割状态下镐型截齿侧向力的实验与理论模型

为建立不同截割状态下镐型截齿侧向力的数学模型,依据截割机理与力学原理分析截齿的截割工况及侧向力的力学特征,在不同的截割状态下,采取截割侧向力与碾挤压附加侧向力有条件叠加的方法,建立了侧向力数学模型;对不同倾斜角和切削厚度截齿侧向力的载荷谱进行频域频谱分析和时域分解,利用最小二乘法反求侧向力模型中的关联性系数,综合修正理论模型。结果表明:侧向力由截割和碾挤压附加侧向力构成,侧向力模型可以综合反映截齿参数、煤岩性质和工作参数的量化关系;实验验证了理论模型的本构关系和定量的准确性,侧向力高频载荷随机变化程度与倾斜角关联性小,低频载荷幅值的主要成分0 Hz稳态值与倾斜角成正比关系。该研究为解决工作机构轴向力平衡等问题,改善设备稳定性提供有效的分析方法和基础。

Experimental research and theoretical model on lateral force of conical pick under different cutting conditions

This paper is a targeted effort to develop a mathematical model on the lateral force of conical pick under different cutting conditions.The cutting conditions and characteristics of lateral force of conical pick were analyzed based on cutting mechanism and mechanics principle.The lateral force model was established by the conditional superposition method of cutting lateral force and grinding extrusion additional lateral force.The lateral force load spectrum for different slope angles and cutting thicknesses was decomposed in frequency domain and time domain.The comprehensive theoretical model was modified by the correlation coefficient of lateral force model reversed by using least squares.The results show that the lateral force is formed by cutting and grinding extrusion additional lateral force.The lateral force model can comprehensively reflect the cutter tooth parameters，coal and rock properties and working parameters of quantitative relations.The experiments verify the theoretical model of the constitutive relationship and the accuracy of quantification.The random variation of lateral force high frequency load is less correlated with tilt angle.The main component 0 Hz steady state values of low frequency load amplitude and tilt angle were positively correlated.This research may provide an effective analysis method and basis for solving such problems as the axial force balance working mechanism and improving the stability of the equipment.