Aiming at the problems of incomplete particle sieving and excessive residual fine particles in the traditional vibrating screen during the grading process of rockfill materials, this study proposes a secondary screening enhancement method by adding an auxiliary screen to the screen box to further improve the screening efficiency. Through the EDEM simulation software, a vibrating screening model with a four-layer screen structure was established, and an improved optimization scheme of adding an auxiliary screen in the screen box was designed. Systematic simulation analysis was conducted on the generated particles. The research content includes the influence of different screen angles, numbers of layers, amplitudes, frequencies, and direction angles on the screening efficiency, as well as the optimization and analysis of the secondary screening process with the auxiliary screen in the screen box. The simulation results show that the secondary screening scheme with the auxiliary screen in the screen box can significantly improve the screening efficiency of particles of various sizes. Based on rigorous verification simulations, the total efficiency increased from 92.4% in the traditional single-pass screening to 96.5%. While ensuring conservative estimates, this result still demonstrates a significant efficiency advantage over conventional designs.
Zhu et al. (Fri,) studied this question.