Study On Dynamic Characteristics And Deflection Of Eccentric Shaft Of 2573 Circular Vibration Relaxation Screen

With the strengthening of the national environmental protection,the proportion of coal in China's energy gradually decreases,but it still occupies an important position in the field of energy.Clean and efficient utilization of coal has always been an important topic of coal separation.Vibration screening equipment is a mechanical equipment that uses vibration principle to complete the screening process.However,due to the working conditions of coal mining and other factors,the water content of raw coal is too much.During the screening process,it is easy to adhere to the screen surface in groups and reducing the screening efficiency.Faced with the above problems,various types of relaxation screens are constantly developed.In this paper,a circular vibration relaxation screen is presented,and its working principle and structure are introduced.The key components and dynamic parameters of circular vibration relaxation screen are calculated and selected,and the stiffness of elastic elements was measured by design and experiment.Finally,its three-dimensional model was established.Based on the dynamic theory and Lagrange method,the three-degree-of-freedom model and vibration equation of circular vibration relaxation screen were established,and the vibration equation was solved.The dynamic simulation of circular vibration relaxation screen was carried out by ADAMS.The correctness of the theoretical model was verified by comparing the simulation value with the analytical solution of the theoretical model.Finite element analysis of circular vibration relaxation screen was carried out,in which the deformation and stress distribution were obtained by static analysis and harmonic response analysis,which verified the rationality of the screen structure and lays the foundation for structural optimization;modal analysis obtainwd the natural frequencies and modes of each order of the structure,so as to effectively avoid the occurrence of resonance in structural design.The deflection equation of the eccentric shaft was established by using the singular function method and the actual force of the eccentric shaft.The eccentric shaft was checked by the fourth strength theory.Finally,the design of the eccentric shaft was completed.ANSYS Workbench was used for finite element analysis of eccentric shaft.ANSYS Workbench was used to analyze the eccentric shaft by finite element method.The results of the analysis were very close to the theoretical results,which verifieed the correctness of the theoretical analysis.Finally,through the mixed programming of LabVIEW and MATLAB,the program and interface of deflection calculation were designed.Based on the theory of elastic press bar,the dynamic model of screen surface was established,and the mathematical expressions of displacement,velocity and acceleration of midpoint on screen surface were listed.The characteristic curves of displacement,velocity and acceleration of midpoint on screen surface under different frequencies were plotted by MATLAB.The influence of frequency on the parameters of screen surface was analyzed more intuitively.A screen test bench was set up to carry out no-load and material-carrying tests on the screen surface,and the correctness of the theoretical analysis was verified by the experimental results.