Study On Screening Performance And Screening Parameters Of Double-Layer Relatively Independent Vibrating Screen

The vibrating screen is the main equipment for the classification of bulk materials.It is widely used in the construction industry,food and medicine and other industries that need to deal with bulk.At present,there are still many problems in the research on how to improve the performance of double-layer vibrating screen.Therefore,in view of the existing double-deck linear vibrating screen whose screen surface inclination is basically parallel design,this paper proposes a double-deck non-parallel and relatively independent motion vibrating screen.Through the co-simulation of discrete element method and multi-body dynamics,the influence of the screening parameters on the screening performance of the double-layer relatively independent vibrating screen is studied.A non-linear regression model of screening efficiency per unit time under different screening parameters is established through intelligent algorithms and support vector regression machines,and the optimal combination of screening parameters is sought.The main contents of this paper are as follows:Firstly,combined with the basic principle,process and matters for attention of discrete element method and multi-rigid body dynamics co-simulation,a co-simulation model of double-layer relatively independent vibrating screen was established,and the co-simulation data was transmitted interactively between ADAMS and EDEM,so that the co-simulation model could carry out and complete the screening process of materials.Secondly,in order to explore the vibration isolation spring K1 between the screen body and the base of the vibrating screen and the upper screen surface and the screen body connected to the vibration isolation spring K2,these two kinds of springs on the double layer of relatively independent vibrating screen working stability.The dynamic simulation model of the two-layer relatively independent vibrating screen was established by ADAMS software,and the mechanical parts of the model were simplified.Through ADAMS dynamic analysis,a rough range of the vibration isolation spring of the double-layer relatively independent vibrating screen in operation is obtained,and the stiffness value of the vibration isolation spring when the working stability of the double-layer relatively independent vibrating screen is good is obtained through the design and simulation test.Thirdly,four groups of single factor tests were designed to explore the influence of different screening parameters on the screening efficiency per unit time,so as to determine the value of screening parameters with the best screening performance.On this basis,the nonlinear regression mathematical model of unit time screening efficiency under different screening parameters was established by using the method of particle swarm optimization and support vector regression machine.Particle Swarm Optimization(PSO)algorithm was used to optimize the screening parameters of the mathematical model,and the screening parameter combination of the double-layer relatively independent vibrating screen with the best screening performance was obtained.Finally,the single factor test was carried out through the two-layer relatively independent vibrating screen experimental platform.By comparing the experimental results with the simulation results,the reliability of the simulation model of the twolayer relatively independent shaker is verified.By comparing and analyzing the experimental results of the two kinds of vibrating screen,the experimental results show that the screening performance of the double-layer relatively independent vibrating screen is better than that of the common double-layer vibrating screen.At the same time,starting from the vibration amplitude and vibration frequency,the relationship between the non-uniform mesh on the screen surface and the screening performance is preliminarily discussed.