Optimal Design Of Dual-track Vibrating Screen With Multiple Excitation Motors

Vibrating screens are widely used in mining,metallurgy and petroleum industry.They can realize the function of material separation and solid-liquid separation.With the development of drilling technology level and drilling fluid system,it is hoped that two or more motion trajectories can be realized on the same vibrating screen to adapt to different drilling conditions.The dual-trajectory shaker based on double or three-excitation motors has become the backbone of domestic oil drilling engineering.In practical engineering application,it is found that two different trajectories of the same vibrating screen are realized,but the equilibrium of the trajectories is poor.In order to solve this problem,this paper carries out the optimization design of the double-track vibrating screen of multi-excited motor,and then carries out a series of researches from two aspects of simulation analysis and experimental test.The completed work is as follows:(1)The vibration dynamic equation of the double-excitation motor vibration screen was established,and the steady-state solution of the vibration system was obtained.So was the three-excitation motor vibration screen.The expression of the swing angle is obtained from the solution,and the function relationship between the design parameters and the motor installation position parameters was derived.The objective of the design was to minimize the square of the swing angle amplitude of the motion trajectory.The design variables were the location parameters of the motor installation.The optimized mathematical model of the trajectory balance of the double-vibration motor and the three-vibration motor vibrating screen was established respectively.(2)For the optimization mathematical model of the vibration balance of the double-vibration motor,the simulated annealing algorithm was selected to solve the single-objective optimization model.The chaotic particle swarm optimization algorithm was chosen to solve the dual-objective optimization model.Aiming at the optimized mathematical model of the balance of the three-vibration motor vibrating screen,the particle swarm optimization algorithm was chosen to solve the problem.The algorithm programming and optimization model programming were carried out by using the software of matlab.The best installation position of the motor and the parameters of the vibration screen were obtained.By using the optimal solution and design parameters,the trajectory of the center of mass and the selected points of the optimized vibrating screen could be obtained.(3)Using RecurDyn software,the rigid-flexible coupling models of double-excitation motor and three-excitation motor shakers were established respectively,and the dynamic simulation was carried out.After theoretically optimizing the installation position of the motor,the motion trajectory of the selected point was obtained through simulation analysis.At the same time,the structural strength of the different vibrating screen under dynamic load was obtained.(4)Two different configurations of the product prototype were processed for the three-motor double-track vibration screen.Through the dynamic test of the vibration testing system,the experimental results were compared with the optimization results and simulation results.The feasibility of the optimization mathematical model and the optimization method was verified.The aim of optimization is achieved,and the goal of optimization was satisfied.