Finite Element Analysis On Dynamics And Fatigue For Linear Vibrating Screen

Vibrating screens are widely used in mining, smelting, coal, building materials, light industry, fire-resistant materials and chemical industries, but their life and performance are largely determined by material and structure. Vibrating screens stand long-time high frequency alternating loads, which will easily lead to fatigue and damage in beams and plates, affecting its’life seriously. So by conducting dynamic and fatigue analysis, it is hoped that by verifying whether the structure is reasonable or not, reliability can be improved, and resonance and damage can be avoided, which is of great significance.Firstly, in this paper, in order to make the simulation more close to reality, screen box’s impact from particles, which is ignored in previous research, will be obtained in the discrete software EDEM, but here it will be used in further FEA for dynamics and fatigue. Then the oscillation equations of vibrating screens are established, and then the equations of motion of screen box are built. To make the computation easy, vibrating screen model is simplified and imported to ANSYS Workbench to obtain a finite element model for modal analysis, harmonic analysis and life prediction for fatigue. After modal analysis is performed, first20th natural frequencies and mode shapes are extracted, which is the foundation of further harmonic analysis. Harmonic analysis is done to find the deformation and change of stress for screen box, which is observed and analyzed to find where the stress concentration areas are; Later, it can be concluded that the screen box’s structure is good enough to meet needs of working hours. A fatigue analysis is performed for all parts in screen box to find which one fail first.According to results above, not only parts which fail first are found, but also conclusions are obtained on whether the structure is reasonable, and that a resonance won’t occur when the vibrating screen is running. Works in this paper can not only provide reference for solving problems like big noise and short life, but also for further optimization and design for vibrating screens.