Research On Key Technology And Equipment For Flexible Bed Vibration Sorting Of Waste Plastic Films

The use of plastic film has brought convenience to human society and reduced the running cost of society,but discarded plastic film can bring great harm to ecological environment and human health if it is not disposed of timely and effectively.The recycling treatment of waste plastic film helps reduce waste plastic film pollution,but the current high cost and small revenue of waste plastic film recycling hinders the development of the industry.Therefore,in order to increase the recycling revenue of waste plastic films,it is necessary to sort waste plastic films with higher purity so that they can be recycled with high value.In this paper,a composite vibration sorting method for waste plastic films based on rigid-flexible coupling is investigated,with the following main research elements:(1)The mechanism of composite vibratory sorting of waste plastic films based on rigid-flexible coupling is studied in depth.A nonlinear multi-degree-of-freedom forced vibration model was established for the flexible bed and the vibrating bed frame respectively,and the vibration characteristics of both were analyzed.Then the flexible bed-vibrating bed frame coupling vibration model was established by combining the two,the boundary conditions and initial conditions of the coupling vibration were determined,and the coupling model was solved by using Matlab software.After that,a method is established to solve the real-time motion state of the film on the flexible bed-vibrating bed frame coupled vibration model,and a flowchart is given for the solution.(2)A "micro-element trajectory method" algorithm is proposed to calculate the motion trajectory of the waste plastic film on the sorting equipment.The kinetic model of the waste plastic film under the action of the vibrating bed is established and analyzed,and the calculation steps of the "micro-element trajectory method" are determined;to verify the correctness of the "micro-element trajectory method",different combinations of parameters are grouped using the orthogonal method.In order to verify the correctness of the "micro-element trajectory method",the orthogonal method was used to group different parameter combinations,and the dynamics simulation was carried out for each group of parameters using ADAMS virtual prototype software and the "micro-element trajectory method" program,and the trajectories obtained from the simulation were compared with those obtained from the "micro-element trajectory method".The results show that the accuracy of the calculation results of the "micro-element trajectory method" is better and the calculation efficiency is higher.The evaluation method and index of the sorting effect are given,and the factors affecting the effect of waste The evaluation method and index of sorting effect are given,and the factors affecting the effect of vibration sorting of plastic film composite are analyzed.(3)Optimization design of the waste plastic film composite vibratory sorting equipment based on rigid-flexible coupling(hereinafter referred to as waste plastic film composite vibratory sorting equipment)was carried out.The design objectives of the waste plastic film composite vibration sorting equipment were clarified,and the basic configuration of the waste plastic film composite vibration sorting equipment was determined.The core component of the equipment,the exciter,was analyzed and discussed in detail,and the three-axis coupling installation form of the exciter was determined.An optimization objective function was established for the waste plastic film composite vibration sorting model,an optimization agent model was established using Kriging method,and the optimization parameters of the waste plastic film composite vibration sorting equipment were obtained by using Matlab optimization toolbox to optimize the agent model.(4)Experiments were conducted using the developed composite vibratory sorting equipment for waste plastic films in combination with machine vision technology.Twenty-five sets of experiments with different parameter levels were designed,of which the 25 th set was the optimized calculated parameters.Firstly,the results of the theoretical calculation of the model were compared with the experimental results,and it was found that the error of the sorting distance between the theoretical calculation of the model and the experimental results was 5.9%,which verified the correctness of the established rigid-flexible coupling-based composite vibration sorting model for waste plastic films;then the 25 th group of experiments was compared with the other 24 groups of experiments,and it was found that,considering the sorting distance and sorting time,the data obtained from the 25 th group of parameters Finally,the data of group 25 were compared with the traditional "wind vibration sorting method",and the "composite vibration sorting method based on rigid-flexible coupling of waste plastic film" used in this paper was better than the traditional "wind vibration sorting method" in the same operation time.In the same operation time,the "composite vibration sorting method based on rigid-flexible coupling" used in this paper increased the sorting distance by 18.66% compared with the traditional "wind vibration sorting method",and the sorting effect was better.