Simulating Study On The Process Of Cutting The Coal Containing Gangue With Spiral Drum

The occurrence conditions of gangue coal and rock are complex and the working environment of shearer is bad.How to make its work more reliable and efficient is the focus of academic research.Therefore,it is of great theoretical significance and engineering application value to study the force of coal and rock and the loading of drum in the process of shearer cutting for the mining of complex coal seam and the design of spiral drum.Based on the test and analysis of physical and mechanical parameters of coal sample in4602 working face of Yangcun Mine of Yanzhou Mining Group,the coal wall model is constructed by using EDEM software.The 3D solid model of the MG2×55/250-BW shearer spiral drum was established by Pro/E,and it was introduced into the coal wall model constructed by EDEM to simulate the process of spiral drum cutting coal containing rock.The collapse of coal and rock under the stress and the load on the drum were analyzed by changing the rotational speed,traction speed,helical angle of vane and pick arrangement of the spiral drum.The results show that:with the increase of the drum rotational speed,the average and maximum stress of coal and rock particles decrease,the number of collapsed coal and rock particles decreases,the coal loading rate increases first and then decreases,and reaches the maximum when the drum rotation speed is 91 r/min,the average load and load fluctuation of the drum decrease;With the increase of drum traction speed,the average force of coal and rock particles and the number of collapsed coal and rock particles increase significantly,the coal loading rate increases slowly,and the average load and load fluctuation of drum also increase;With the increase of helical angle of vane,the average load of coal and rock particles tends to decrease,the number of collapsed particles and coal loading rate increase first and then decrease,and reach the maximum at 13~°,the average load and load fluctuation of drum decrease.Compared with the sequential type,the load is larger and the collapse number is more of coal and rock particles when cutting by cross-arranged drum,but the coal loading rate changes little,the average load of the drum decreases,the load fluctuation increases.Based on the orthogonal experiment,the influence of drum speed,traction speed and blade spiral lift angle on the load fluctuation of drum is analyzed,and considering the coal loading rate and drum load,the optimal parameter combination is determined as follows:drum speed 91r min,blade spiral lift angle 13°,cutting teeth arrangement mode,shearer traction speed 4.2 m min.Finally,the transient dynamic simulation of the cutting process of the spiral drum under the optimal working condition is carried out based on ANSYS-Workbench,and the stress of the drum is analyzed.The results show that the position of the maximum stress is on the tooth tip of the end disk cutter,followed by the tooth surface of the end disk cutter and the welding between the cutting tooth seat and the end plate.The maximum stress is 584.21 MPA,which is less than the yield strength of the material 1080 MPA,and the safety factor is 1.849,which meets the operating conditions.