Study On The Mechanism And Device Of Composite Vibration Separation Of Waste Plastic Film

Plastic film has been widely used in flexible packaging industries such as food packaging,pharmaceutical packaging,clothing packaging,agricultural packaging,and other industries due to its wide range of sources,portability,and speed of use.However,due to the large-scale production and utilization of plastic films,plastic film waste is also increasing.Only by recycling waste plastic films can we better deal with the environmental pollution caused by waste plastic films.To recycle and utilize waste plastic films with high value,it is first necessary to sort and classify different types of plastic films.In this paper,the coupling vibration sorting method is mainly used to sorting waste plastic films,and the sorting mechanism of waste plastic films in the vibration sorting process is analyzed by studying plastic films,elastic bed surface,and vibrating bed.By optimizing the vibration parameters to improve the sorting effect of waste plastic films,a composite vibration sorting device was developed and tested,which verified the correctness of the research method.The main research contents are as follows:Aiming at the problem of low sorting accuracy of waste plastic films,a new method for sorting of waste plastic films,coupling vibration sorting,was proposed.The dynamic interaction analysis mechanism of plastic film,elastic bed surface,and vibrating bed is described,and the dynamic equation expression of the coupling vibration sorting model of thin film-bed surfacevibrating bed is established.The dynamic system equation is solved by the step by step integration method adopted Wilson-θ,and the vibration response of a single thin film during vibration sorting is analyzed.On this basis,the displacement curves of different thin films on the vibrating bed surface were further analyzed.The study found that the sorting displacement difference of the coupling vibration sorting model was increased by about 50% compared to the uncoupling vibration sorting model,which verified the effectiveness of the coupling vibration sorting model and the feasibility of the sorting method.Aiming at the vibration response mechanism of the elastic bed surface during the coupling vibration sorting process,the influence of different truncation orders on the coupling vibration response of the thin film-bed surface-vibrating bed was studied based on the Galerkin truncation method,and the Galerkin truncation order to ensure the convergence of the coupling vibration sorting system was determined.The influence of different system parameters on the coupling nonlinear vibration response is studied.The Galerkin truncation method is used to analyze the vibration responses of different modes of the elastic bed surface.Based on the above research mechanism,the resonance critical speed that the elastic bed surface should avoid during the coupling vibration sorting process is obtained,and measures can be taken to ensure the sorting effect.Aiming at the influence of vibration frequency,angle of eccentric block,longitudinal inclination angle and transverse inclination angle of elastic bed surface on the sorting effect of plastic film,four sets of tests based on different sorting parameters were designed,and the sorting parameter values with the best sorting effect in the tests were determined.Based on this,a nonlinear regression mathematical model for the sorting displacement difference of different thin films under four sorting parameters was established by combining particle swarm optimization and support vector regression.At the same time,the particle swarm optimization algorithm is used to optimize the sorting parameters of the nonlinear regression mathematical model,and the sorting parameter combination for the optimal sorting effect of the coupling vibration sorting system is obtained.Based on the above theoretical analysis,a dynamic analysis of the composite vibration sorting device was conducted,and a composite vibration sorting prototype with adjustable sorting parameters was designed and developed,which can achieve multiple combinations of composite vibration sorting with different sorting parameters.Four sets of experiments were conducted using the constructed composite vibration sorting device.The study found that through comparative analysis of experimental results and calculation results of the coupling vibration sorting model,the average error between the prototype experimental and model calculation data was 7.04%,which meet the needs and met the use requirements.At the same time,the sorting law of thin films obtained from the experiment is the same as that calculated by the model,which verifies the correctness of the coupling vibration sorting model.