Research On The Dynamic Behavior Of The Middle Through Of Scraper Conveyor

Scraper conveyor is not only the running track of shearer,but also the main bearing part of coal transportation.The normal operation of scraper conveyor is very important for the whole mining equipment.The middle slot is the main part of the scraper conveyor,accounting for 70% of the whole system quality,which is also the most easily damaged part.Because of the complex stress condition of the middle groove and the difficulty of analysis in the actual working process,it is difficult to determine the cause of the damage of the middle groove.In order to analyze the failure reason of the middle slot and optimize its design,this paper takes the middle slot of scraper conveyor as the research object,and studies the dynamic behavior of the middle slot under various typical working conditions.Firstly,the stress sources of the middle groove under straight and oblique cutting conditions are analyzed.Improve the dynamic analysis model of shearer and the simulation model of cutting coal body by drum,and use Adams multi-body dynamic analysis software to establish the virtual prototype model of shearer under straight and oblique cutting conditions.The dynamic analysis software is used to simulate and analyze the front and rear drum,obtain the three-dimensional force on the front and rear drum,apply the corresponding three-dimensional force on the drum mass center of the shearer,simulate and analyze the prototype again,obtain the load action curve of the traveling wheel,guide sliding shoe and smooth shoe of the shearer on the middle groove under the straight and oblique cutting conditions,and provide the load for the mechanical analysis of the middle groove basis.Secondly,the dynamic analysis of the middle trough is carried out under the condition of coal and rock ground leveling and unevenness.The coal and rock ground is replaced by the bottom plate.Under the condition of the bottom plate leveling,it is divided into straight line and oblique cutting conditions,andunder the condition of unevenness,it is also divided into the above two conditions.Through the simulation results,the dynamic behavior of the middle groove under various working conditions is observed,and it is found that the coal shoveling plate in the middle groove is the main part of the stress,and some deformation occurs at the same time.The high stress area mainly occurs at the root of the rib plate and the dumbbell pit in the middle groove.The actual fracture location of the middle groove is consistent with that of the high stress area,and it is inferred that the fracture of the middle groove is caused by tensile stress.Finally,on the basis of the previous analysis results,the optimization module of Workbench is used to optimize the design of the middle groove where high stress is easy to occur.Four design variables(rib thickness,rib chamfering,dumbbell pit radius,coal shovel thickness)and three objective functions(maximum equivalent stress,maximum deformation and groove side mass)are determined.In the corresponding optimization design module,a series of experiments are carried out on the four previously determined design variables of the groove side of the shovel plate,and various kinds of internal objective functions and between design variables and objective functions are designed Relationship analysis.Finally,the optimization results are obtained,that is,the mass is reduced by 0.5%,the maximum stress is reduced by 5.6%,and the maximum deformation is reduced by 4.8%.Through three target variables,the results are all reduced,which greatly improves the high stress phenomenon at the bottom of the rib plate and the dumbbell pit.At the same time,the actual production cost is also considered,which provides guidance for the manufacturing of the middle groove in actual productionIn conclusion,this paper lays a theoretical foundation for the study of the dynamic behavior of the middle slot of the scraper conveyor,and also provides a certain practical guidance for the energy saving and consumption reduction of other equipment in the three machine supporting equipment.