Influence law of kinematic parameters on the stress of drum cutting coal gangue

Because of the complexity of the occurrence conditions of coal gangue and the nonlinearity of the load during coal and rock cutting by drum,it is very difficult to obtain the stress information. Therefore,it is hard to match the ki-nematics parameters from the aspect of reliability. According to the coal cutting mecha-nism and finite element theory, the coupling model of cutting coal gangue by spiral drum was established by using LS-DYNA. To obtain the maximum stress information of coal gangue and drum-picks-related compo-nents,the dynamic simulation of cutting process under different working conditions was carried out respec-tively. By using surface fitting technique,the influence law of drum rotating speed and hauling speed on the maximum stress of coal-rock and drum-picks-related component was analyzed, and the law equations were established. Taking the shearer productivity and cutting energy consumption as the object, the optimization equation of kinematic parameters of shearer drum was established,and the best matching value of drum speed and hauling speed was obtained. The results show that when the drum rotating speed is 61. 63 r / min and the hauling speed is 4. 776 m / min,the shearer productivity can reach 190. 64 t / h,and the cutting energy con-sump-tion is only 0. 868 9 kW·h / m3 . The stress of alloy head,pick body and holder are 1339. 4 MPa,887. 5 MPa,454. 7 MPa and 105. 2 MPa,respectively,and the maximum stress of rock and coal are 59. 15 MPa and 8. 799 MPa,respec-tively.