Structure Optimization And Self Rotation Simulation Of Pick

The coal cutting process is extremely complicated.The cutting pick,as a cutting tool,plays a major role in the whole process.The performance of its self-rotation directly affects its wear resistance.In order to improve the self-rotation performance of pick-shaped cutters and reduce the failure of picks caused by local wear of partial wear,the pick-shaped cutters are optimized in structure.Through grooving the pick-shaped cutter tooth body,it is divided into three shape parameters: ordinary,grooved and ribbed.For the pick-shaped cutters of these three shape parameters,the simulation of cutting coal and coal cutting scraps was carried out to determine the magnitude of the shear force and the angle between the particle flow and the axis of the pick axis is used as an index to judge its spin performance for comparative analysis,so as to select shape parameters with better spin performance.The BPM model in the discrete element method is used to simulate the interaction between particles in coal and rock,and a standard uniaxial compression test model is established in the EDEM software environment to perform a virtual parameter calibration test.Record the compressive strength of coal and rock calibrated in the EDEM software environment and compare it with the laboratory test results to correct the adhesive bond parameters.Finally,calibrated the discrete element model of coal and rock,paving the way for the cutting simulation of coal and rock in the following text.According to the amount of material excavated from the tooth body,pick-shaped cutters are divided into three types: ordinary,grooved,and ribbed.And considering the optimization of computing resources,the simulation analysis of coal and rock cutting is carried out by taking the two extreme shape parameters of ordinary and ribbed.When the pick-shaped cutters cut coal and rock,the failure mode is slightly different,but the shear force is not much different.When the ribbed pick-shaped cutters cut coal and rock,the failure mode is regular,and the chip outflow effect is regular;the shear force of the two picks is basically the same,and the self-rotation performance is not much different.Therefore,considering the effect of the cutting section,it is reasonable to optimize the pick body to a ribbed structure.Analyze the self-rotation performance of three different types of pick-shaped cutters for cutting coal and rock bulk materials.When the pick-shaped cutters cut the bulk materials,the particle flow and the angle of the pick axis and the size of the cutting force is used to compare and analyze the self-rotation performance of three different cutters.Through simulation calculation,it is obtained that when cutting coal and rock bulk materials with different particle radii,the particle flow and the angle of the pick axis is the largest when the ribbed pick-shaped cutter cut,followed by the grooved pick-shaped cutter,and the ordinary pick-shaped cutter is the smallest.Therefore,when the particle flow and the pick axis are used as indicators to judge the self-rotation performance of the pick,the ribbed pick-shaped cutter is the best,the groove is the second,and the ordinary is the worst.Through analyzing the shear component of the force acting on the pick,it is found that when the pick cuts coal and rock particles with different particle radii,the shear force on the trough and rib pick picks is greater than that of the ordinary pick-shaped cutter.Furthermore,it shows that both the groove type and the rib type structure improve the self-rotation performance of the pick-shaped cutter.