Research On Dynamic Characteristics Of Mechanical And Electrical Coupling Vibrating Screen System

Vibrating screen equipment is widely used in various industrial departments at present.Because its dynamic characteristics have great influence on its screening efficiency and service life,so it has become the focus of current industry research.Most of the modeling methods now mainly focus on the dynamic characteristics in the plane of symmetry,but the errors caused by the constraints of design and manufacture capacity are often produced in reality,which let the motion of the vibrating screen become more complex in the space,so establish the motion mathematical model of vibrating screen in whole space and make simulation research on it is necessary.Single axis circular motion vibrating screen is typical vibration screening equipment,which also is the first choice of Enterprise’s R&D.The dynamic characteristics of a 3YKR circular motion vibrating screen were studied in this paper,the mechanical model and mathematical model in space of the circular vibrating screen were established by using the method of rigid body dynamics and theoretical mechanics.Combined with the motor theory established the electromechanical coupling model and made the simulation. Finite Element Analysis were be made and also used orthogonal experiment to optimize. The main work is as follows:1.According to the structural characteristics of the circular vibrating screen, established the mechanical model in space. Using the method of rigid body dynamics and theoretical mechanics established the dynamic mathematical model in space by D’alembert’s principle and Lagrange equation of the circular vibrating screen. Made Matlab/Simulink numerical simulation for the mathematical model under D’alembert’s principle,obtained deformation of translation and torsional pendulum and the trajectory of vibrating screen,the model laid a foundation for the establishment of electromechanical coupling model.2.Summarized the electromechanical system electromechanical coupling modeling methods. Using motor drive theory established the mathematical model of induction motor. Using dynamic parameter like rotational speed converted to load torque for Mechanical partial dynamic model,through the rotational speed and torque phase coupling,a Matlab/Simulink simulation model of the motor- circular vibrating screen is established. Made the simulation of starting and braking of motor,observed the change of electromagnetic torque and output rotational speed and the motion trajectory of circular vibrating screen. The transient amplitude and the movement condition of starting and stopping process of circular vibrating screen is obtained,which provided the basis for the study to reduce the transient amplitude and the starting and stopping time of the circular vibrating screen.3.Simplified the 3D model of circular vibrating screen reasonably. Established the ANSYS/Workbench FEA model,selected the right material against actual conditions,set the contacts,connections,loads reasonably,the modal analysis and transient Structural dynamic analysis of the circular vibrating screen are carried out. Obtained the first 10 modal and natural frequency,main vibration mode,nephogram of the change of the stress and deformation.The results verify the reliability of the numerical simulation model,checked the reliability of the design strength.4.In the process of dynamic modeling and simulation,the dynamic parameters of circular vibrating screen are searched and estimated in this paper,the calculation methods provides a basis for the design of parameters and the type selection of circular vibrating screen.5.Determine the index of circular vibrating screen design,selected the key dynamic parameters and empirical numerical composed the factors and levels table,the orthogonal experiment was carried out by using the simulation model. Primary and secondary subsequence of dynamic parameters for production efficiency and dynamic load on foundation of the circular vibrating screen and two optimal combination were obtained.Through rational analysis and re test, the optimal combination selection scheme is obtained.Provided a method and basis for the designer to choose and design the dynamic parameters.