Numerical Simulation Study On Wear Failure Of Spiral Drum In Gangue-containing Coal Seam

Under the condition of coal seam containing gangue,the cutting process of spiral drum is affected by complex and variable loads.The cutting picks and helical blades arranged on the spiral drum are easy to wear out prematurely,which directly affects the working efficiency of the shearer and reduces the service life of the spiral drum.Taking the spiral drum of MG400/951-WD new shearer as the engineering object,the coupling model of the spiral drum cutting coal seam containing gangue is constructed by using Pro/E and ANSYS/LS-DYNA software.The cutting process of the spiral drum under different parameters is numerically simulated and solved,the wear position of the pick and the helical blade is found,the load and stress state of the pick and the helical blade are extracted,and the wear is combined.The wear mechanism was analyzed,the total wear depth of the pick and helical blade was obtained,and the variation rule of the total wear depth of the pick and helical blade under different working conditions was analyzed.The results show that the wear area of the pick mainly concentrate on the tip alloy head and front edge,the wear location of the helical blade at the end and outer edge of the blade,and the wear of the blade is the most serious;the total wear depth of the pick and helical blade increases gradually with the increase of traction speed;and the total wear depth of the pick and helical blade decreases gradually with the increase of rotation speed;with the increase of lead angle,the total wear depth of pick has no obvious change rule,however the total wear depth of helical blade gradually decrease.The influence of traction speed,rotation speed and lead angle on the wear of spiral drum is analyzed by orthogonal test method.Combining with the actual working state of shearer,the optimum combination of the above three factors is obtained when the total wear of spiral drum is the smallest,so as to improve the wear resistance of spiral drum.The optimization design provides a reference,but also provides a theoretical basis for the follow-up material repair.