Separation Of Nonmetallic Particles Of ELV With Wind Assisted Vibration Screening

The nonmetallic materials in end-of-life vehicle mainly consist of three categories: glass,rubber and plastics.It is difficult to separate the mixed particles with the perforated screen after the breakage,because of their similar size.Since the mass of the glass particles is greater than the other two particles,they can be separated by the winnowing method.While this method is not suitable for the separation of the other two substances for their similar weight.According to the differences in friction and other factors between two particles and sieve,a non-porous vibratory screening device is designed in this paper.Set the vibration parameters such as the amplitude,frequency,vibration direction angle,and the inclination angle of the screen and make the two kinds of particles to run in different directions along the screen.The operation of the particles on the non-porous vibrating screen plate is mainly determined by the vibration parameters of the screen.Straining by vibrating alone is not sufficient to make both types of particles to run to both sides of the screen at the same and maximum speed.In order to increase the sorting efficiency,the wind-assisted movement is performed on another particle while ensuring that one of the particles is operating at the maximum speed.In this dissertation,the movement of non-metallic particles on the vibrating screen was studied and the physical model of the particles was established.The formula of the speed and acceleration of the top-down sliding and throwing motion of particles and the mathematical formula of the vibration parameters of the screen were deduced.Using discrete element software,EDEM to simulate the movement of plastic particles and rubber particles on a sieve plate.The orthogonal experiment of multiple variables of sieve parameters was designed to get the best screening combination.When the screen plate amplitude is 4mm,the vibration frequency is 12 Hz and the vibration direction angle of the screen surface is 28°,the two particles can achieve a relatively high sorting rate.At the same time,the rubber particles moving upward along the sieve plate are faster than the other groups.To increase sorting efficiency,it is ensured that the two particles can move to both sides at the same speed and wind-assisted movement is performed on the side of the relatively slow-moving plastic particles.Using EDEM-FLUENT software coupled simulation can obtain the corresponding wind speed.When the angle of the wind outlet and the sieve plate is 30 °,choosing wind speed 7m/s can get the best sorting parameters.while the separation of rubber particles and plastic particles on sieve plates was verified by experiments and comparing the results with software simulation,it can be found that the error between experimental verification and simulation results is very small,which can provide reliable data for the design of wind-assisted vibration separation screens.This paper makes a detailed study on the motion of rubber particles and plastic particles of ELV in the non-hole vibration sieve plate,and a wind assisted sieving scheme is proposed to separate and recycle non-metallic materials from scrap cars.The effects of different vibration parameters and different wind speeds on the operation of the particles were studied.The best combination of parameters was used to make the two particles achieve the best screening effect.And the experimental prototype was designed to analyze and verify the simulation data.It provides a theoretical basis and reference for sorting non-metal mixtures in scrapped cars and even more.