Research Of Screening Efficiency Of Vibrating Screen Based On Virtual Prototyping Technology

Ballast cleaning machine is an essential maintenance machinery of modern railway which performs track-laying, maintenance and the repair of the railway. Its working quality directly affects the quality of the railway and the safety of train travel. Some ballast cleaning machines can mainly be served as screening required stones laid on the railway roadbed and backfill the qualified stones to the railway embankment. And, Vibrating screen is the main working parts of some full-face ballast cleaning machine. Therefore, it is of the great significance to research on the effect of screening efficiency while the technical parameters of the vibrating screen are changed.Based on ADAMS software, the reasonable simplification of the vibrating screen is carried out, and the virtual prototype model of the screen is established in this paper. On the basis of the virtual prototype of the screen, required particles on behalf of the materials for simulation experiment are added and contact models of particles to particles and particles to screen surface are established. So the required simulation experiment model consists of the Virtual prototype model and the contact model.In order to improve the screening efficiency of vibrating screen, the established model is used to investigate the relationship between the screening efficiency and four primary kinematics parameters of the screen including vibration amplitude, vibration frequency, vibration direction angle and inclination of screen surface in this paper. Firstly, the single particle screening process is simulated, which includes two aspects: single-factor simulation and multi-factors simulation. The single-factor simulation test is an ideal state, which does not consider interactions among various parameters; in the multi-factors test, while four selected parameters simultaneously change, there are some interactions among parameters. The simulated results show that the multi-factors is not the simple repeated addition of the single factor effect, and the combination of the best technical parameters for the single-particle material is obtained. Secondly, preliminary studies on simulating the screening process of multi-particle material are carried out, and the percentage of the particle number by means of screening material is served as the percentage passing through the screen. The result shows that the amplitude and the excitation frequency of the vibration exciter are two important parameters which have greater influence on the screening rate than the screen surface inclination angle and vibration orientation angle.Simulation results of single-particle and multi-particles are comprehensively analyzed, obtaining two ways of improving screening efficiency of the vibrating screen. One is to accelerate the passing of the screened materials through improving the dispersion level of the material on screen surface. The other is to reasonably adjust the technical parameters of the screen so as to make the screening operation in optimum state. Through the research of this paper, a convenient effective method is provided to determine the kinematics parameters that are used to improve the screening efficiency of vibrating screen. And, obtained kinematics parameters in this research can be served as the reference of practical application.