1.Heilongjiang University of Science & Technology,Harbin ,China;2.School of Mechanical Engineering,Heilongjiang University of Science & Technology,Harbin ,China; 3.Department of Academic Research,Heilongjiang University of Science & Technology,Harbin ,China

In order to improve the crushing effect of coal and rock,ABAQUS finite element software was used to analyze the load characteristics of broken coal and rock of disc cutter,the simulation test of axial vibration of disc cutter and radial cutting of broken coal rock under the working condition of cutting thickness of 14 to 30 mm is carried out.Numerical statistics and fractal scale coefficient method are used to analyze the load spectrum of broken coal and rock with disc cutter.The results show that when the wedge angle of the disc cutter is 45 °and the cutting thickness ranges from 14～30 mm,the radial load peak maximum value and the peak-to-average ratio of the fractured coal of the disc cutter without axial vibration are 6.2% and 8.4%,larger than those with axial vibration.From the numerical simulation stress cloud diagram,it can be seen that when the disc cutter with axial vibration is applied to crush the coal rock,the wedge has a wider influence range on the stress of the coal rock and the radial load spectrum is calculated.The fractal scale coefficient of the radial load spectrum shows that the fractal proportional coefficient without axial vibration is 20.5%～67.5% larger than that under axial vibration,which indicates that it is more favorable for large-scale collapse of coal and rock under axial vibration.This research provides a reference for the in-depth study and practical application of disc cutting tools,and lays a foundation for further research.