Optimization Design Of Parameters Of Driving Sprocket Of Scraper Conveyor Based On Orthogonal Theory

With the development of the scraper conveyor to high power,heavy and super heavy,the excessive wear of the driving sprocket is the main form of the failure of the scraper conveyor.As the core part of the scraper conveyor chain transmission system,the driving sprocket has an important influence on the reliability and service life of the scraper conveyor.Therefore,to optimize the structure of the driving sprocket helps to reduce wear of the driving sprocket,so as to enhance the reliability of the chain transmission system,improve the operation efficiency and service life of the scraper conveyor.First of all,the force analysis of the meshing engagement between the round link chain and the driving sprocket is carried out,the running resistance of scraper conveyor is calculated.analyze the ring chain and driving sprocket meshing process by using the finite element software ANSYS/LS-DYNA,it is concluded that the maximum force of the driving sprocket nest is located near the ring groove,which lays the foundation for the optimization of structural parameters of the driving sprocket.Secondly,the orthogonal optimization design method is introduced into the optimization of the structural parameters of the driving sprocket.Extract thedriving sprocket four key parameters: tooth arc radius,length of chain nest,short tooth thickness,radius of the chain nest arc,by using the orthogonal optimization design,the optimal combination of the four structural parameters that affect the meshing contact state of the driving sprocket and the influence law of the maximum stress on the driving sprocket are obtained.The contact analysis of the round link chain(?14?50)and optimized the driving sprocket was carried out by LS-DYNA,comparative analysis of the simulation results before and after optimization of the driving sprocket,the optimized driving sprocket the maximum strain decreases 2.586%,the maximum stress is reduced by 2.869%.Finally,the wear test of the driving sprocket before and after optimization was carried out by using self designed scraper conveyor(SGB420/17)simulation test bench.Through the analysis of the amount of wear and surface morphology before and after optimization of the driving sprocket,under the same experimental conditions,the surface morphology of the optimized driving sprocket nest is better,the optimized driving sprocket wear is reduced by24.2%;when the wear amount is equal to the not optimized driving sprocket,the running time is increased by 16.7%.the validity of the orthogonal optimization results is verified by theory and experiment,and the structural parameters of the drive sprocket are optimized,the wear of the driving sprocket is reduced,and the service life of the driving sprocket is prolonged.