The Dynamics Analysis And Study Of Large-Sized Linear Vibration Screener

Vibrating screener is a new type machine which has been developed promptly in recent twenty years and applied widely in industries of mining, metallurgy, petroleum, construction etc. Linear vibration screener is the most widely used screening products, with advantages of dehydration, sculting, desliming and effective screening. With the increased mechanization of mining, the capacity requirements on the vibration screening machine are increasing. Therefore, the research, design and manufacture of large-scale linear vibration screener has become an important research subject. And, it has a great significance to reduce stress level and eliminate stress concentration of vibrating screener for the aim to improve its working reliability and extend the life-span.This thesis applied the finite element analysis software ANSYS to the 27m2 large-scale linear vibration screener and completed the following works.(1) Established the finite element model of vibrating screener, discussed the problems encountered in the process of modeling.(2) Found out the natural frequencies and main modal type of vibrating screener by modal analysis.(3) Found out the rules of stress distribution of vibrating screen by harmonic response analysis.(4) Advanced improvement measures on the structure of vibrating screener, modally analyzed the vibrating screener whose structure has been modified.The Natural frequency is away from the operating frequency of the screener, to avoid resonance.(5) Analyzed the vibrating screener whose structure has been modified by the harmonic response, to avoid stress concentration.(6) Experimental modal analysis was carried out on, comparing the results of experimental modal analysis to the results of the finite element method calculation, to verify the improved structure.The analysis results expressed that 1:10 of the finite element model established in this thesis meet the requirements of the stress analysis. The natural frequency and vibration frequency of the modified screener do not coincide, to avoid the resonance, and to avoid the stress concentration and a significant reduction in stress levels.The research process and results provide a good method and scheme for the production and structure design of vibrating screen. It has reference values for the problems resemble which use the finite element method also.