Cutting Characteristics Of Coal And Rock With Faults By Shearer

In recent years,the thick and medium thick coal seams in the mine have been continuously exploited,and the coal resources have been scarce.In order to develop more abundant coal resources,it has turned to the small fault coal rock field which was rarely exploited before.However,the external load of shearer spiral drum in cutting coal with small fault will change according to the different dip angle of coal seam.In order to make clear the cutting performance of spiral drum in coal stratum with small fault,this paper takes MG500 / 1130-wd shearer spiral drum as the engineering research object,uses Solid Works to establish the three-dimensional model of shearer spiral drum,and edem discrete element software establishes the coal wall model with small fault,and introduces the three-dimensional model of spiral drum into the discrete element software to realize the shearer spiral drum cutting fault Coupling model of coal and rock.Under different coal wall models,different traction speed and cutting depth are set for numerical simulation,and the cutting resistance,coal falling rock quality and drum torque change trend with time are extracted in the simulation process.The cutting resistance force,coal falling rate and cutting specific energy consumption of front drum and rear drum in different stages of fault crossing under each working condition are analyzed in detail The influence of traction speed and cutting depth on the cutting performance of front and rear drums passing through fault is obtained by transverse analysis,and the influence law of coal seam dip angle on cutting performance of shearer spiral drum is obtained through longitudinal analysis.The results show that: when the coal seam dip angle is the same,the cutting resistance of spiral drum increases with the increase of traction speed.When the coal seam dip angle is the same and the traction speed is the same,the cutting resistance of spiral drum increases with the increase of cutting depth.When the haulage speed is the same,the cutting resistance of spiral drum increases with the increase of coal seam angle.And through the cutting resistance load fluctuation coefficient to explore the type of shearer more reliable test conditions.Through the analysis,it is found that with the increase of coal seam dip angle,the productivity of shearer shows a downward trend.When other conditions are fixed,the relationship between the haulage speed and the specific energy consumption of the shearer is approximately a power function.The specific energy consumption of cutting decreases with the increase of traction speed,increases synchronously with the increase of cutting depth,andincreases with the increase of coal seam dip angle.And through sensitivity analysis,the influence degree of cutting parameters on cutting specific energy consumption is obtained.The research content of this paper provides a better scheme for coal seam dip angle cutting by shearer spiral drum,and provides certain theoretical support for improving the actual situation of shearer cutting coal and rock with fault.