Indirect Test Of Synchronous Phase Difference Angle Of Three-motor Self-synchronizing Vibrating Screen

In the sieving machineries,the self-synchronous vibrating screen who is owned simple structure,reliable work characteristic and is easy to be repaired duing to no direct connection between the motors,based on rotors’ coupling principle,is gradually replacing the forced synchronous vibrating screen driven by gear or belt.For such rotor-coupled self-synchronous vibrating screen,many scholars have adopted the Hamiltonian principle,the average small parameter method,the Poincare method and the energy method to discuss the synchronous performance,and put forward that synchronous phase difference between eccentric motors is the direct physical quantity to evaluate the self-synchronization system’s performance of synchronous mechanical system.However,the research on the synchronous phase difference angle’s test is stopped at the traditional shooting and the direct speed test.In this paper,a new indirect test method for synchronous phase difference angle is proposed for the shortcoming of traditional test.The study on synchronous phase difference’s indirect test method of double-motor and tri-motor self-synchronous vibrating screen is carried out,respectively,from three points of theory,simulation and experiment.The main work completed are described as follows:(1)In view of the existing mature self-synchronization theories,the synchronization behaviors of double-motor and tri-motor self-synchronous vibration system were studied by the Poincare method and the average small parameter method respectively.In addition,the corresponding theoretical model of indirect test for synchronous phase difference was established according to the movement relationship between any point on the self-synchronous vibrating screen box and its center of mass,and the procedure for calculation and analysis of synchronous phase difference value was written meanwhile.(2)According to the theoretical model deduced,the electromechanical coupling dynamics models were established by MATLAB\Simulink with asynchronous induction motor simulation module and calculus module.The correctness of the indirect analysis method of synchronous phase difference value was verified by computer simulation technology method,and the location arrangement of the measuring points was determined.(3)Double-motor and tri-motor self-synchronous elliptical vibrating screen model were designed by PTC Creo 3D software and processed for test experiment.What’s more,the analysis system was designed based on Matlab\GUI to analyze and manage the dynamic test experimental data efficiently.(4)The indirect test experiment and the high-speed camera contrast experiment were carried out at the same time.Comparing the stable values of synchronous phase difference obtained by experimental data analysis system with thoes accquired by AutoCAD respectively,and the indirect test method for synchronous phase difference angle was proved to be feasible.