Dynamic Analysis Of Large Linear Vibrating Screen Starting Process And Substructure

Large vibrating screens have many advantages, including of increasing treatment capacity, improving economic efficiency, which make large vibrating screens widely applied in the industry and the study about large vibrating screens develop rapidly. The analysis and calculation of structural strength is one of the key problems in the study, and calculation of the mechanical behavior during the starting process of the vibrating screens is the.most key problem. The starting process of large vibrating screens was analyzed and studied in-depth according to above problems. The stress distribution and deformation law of vibrating screens’parts was got, some useful conclusions was draw, which offer references for structural design and optimization of vibrating screen.In this paper, firstly forced vibration model caused by the eccentric mass was built, based on structural dynamics and the work characteristics of liner vibrating screen, and then the vibration differential equations of system are established by d’alambert’s principle. The exciting force loading data which is more suitable to the actual conditions was estimated, and the general motion law of the starting process of vibrating screen was obtained through simulating with MATLAB.The finite element model of the screen box of vibration screen through ANSYS, and some related problems in the modeling were discussed. The screen box was analyzed through modal analysis module, and the first14natural frequencies and vibration modes were got, and the result shows that the structure doesn’t have sympathetic vibration under steady state.The time-dependent analysis of the screen box was made with above exciting force data through data channel between MATLAB and ANSYS, and the stress distribution and deformation law of screens box was got:there are stress concentration during resonance, and stress was well-distribution under steady state; the stress of the junction of the beam and side plates was biggest, which can offer references for structural design and optimization of vibrating screen.In the end of this paper, I tried to use the method of substructure-divided and power flow to analyze the strength of substructures, and obtained useful conclusions. The comparison results showed that, the established finite element model of screen box of vibrating screen reflects better the actual structure of screen box, and satisfied the requirements of the dynamic analysis; The exciting force data in this paper was more suitable to the actual conditions, and for the first time the dynamic analysis of the starting process of vibrating screen was made, and tried to use substructure-divided method and power flow method, and successful effect was got. The research results not only can offer references for calculation analysis during the develop process of vibrating screen, but also provide a good method for the vibration analysis and strength analysis of the vibrating screen and other vibrating machines.