Research on the change rule of stress law of coal seam broken down by spiral drum based on MATLAB and LS-DYNA

Based on the theory of coal breaking by pick-type interceptor teeth, the drum cutting force model was established and the calculation program was designed. Taking the drum of MG2×70/325-BWD coal mining machine as the research object, the three-dimensional model was built by UG and then imported into Hypermesh, and the Solid Edit function was used to cut the unmapped bodies such as the truncated teeth and the coal seam in the model, and the alloy head, the tooth body, and the tooth seat were analyzed by LS-DYNA to get the cloud diagrams of the kinematic parameters and the change of the stresses and the equations of the drum truncation force and the rotation speed and the formula of traction speed.