Design And Performance Test Of The Key Components Of The Field Membrane Trash Separation System

The technology of film mulching and cultivation has made great contribution to increasing crop yield and income,but also destroyed the cultivation environment of soil.How to recycle and utilize agricultural film effectively,purify the soil environment,and realize the sustainable development of agriculture.It is an urgent problem.Nowadays,a variety of residual film pickers have emerged,but their collection efficiency is not uniform,which can not achieve the function of membrane separation.Therefore,this paper develops and designs a field membrane clutter sorting system to solve the practical problem of residual film impurity removal.In this paper,field investigation,membrane clutter characteristics analysis,flow field simulation and experimental verification are used to systematically analyze the membrane clutter system.The related research results are obtained by analyzing and experimenting.The research content of this paper is divided into four parts:(1)In order to select a reasonable scheme of membrane separation,according to the investigation results of mechanical picking up the residual film in Guizhou tobacco district,the scheme of adding shredding device was worked out to improve the separation efficiency of the residual film.The experimental study on the tensile tear characteristics of the residual film shows that when the tearing speed of the shredder is less than 0.27m/s,the phenomenon that the shredder does not swallow the material at the inlet can be alleviated,and the value of the velocity provides reference data for the design of the shredder speed.In order to design wind speed value of membrane air separation,the floating characteristics of different materials in the flow field were obtained by the floating test of the membrane miscellaneous,and the results of the air separation method were verified.Feasibility of separation of membrane mixtures.(2)The separation system of membrane miscellaneous mainly includes two processes: shredding and wind separation.The single roller shredder is used as the shredding equipment for the mixture,and the stripping plate is added inside the shredder to solve the problem of the residual film winding cutter roll.In order to adapt to the shearing of mulching film,the blade is designed with sawtooth blade.A 12-horsepower single cylinder diesel is utilized to power the system.The system uses worm gear and worm reducer to achieve 1: 68.6 deceleration between shredder and diesel.The frame is the load-bearing part of the whole equipment.Through the mechanical simulation of the frame,the results show that the frame size and material selection meets the strength design requirements.(3)The movement simulation analysis of the shredder cutter roller shows that the effect tearing speed accord with the law of trigonometric function transformation.In order to obtain the maximum pull force when the moving knife and the fixed knife bite,the optimized research shows that the angle between the blade and the shaft side should be 60.8°.The innovation of the V-shape layout scheme is used in assembling the blade,which reduces the rotary moment of the cutter shaft and vibration of the equipment when it works.The stress and fatigue strength of the cutter shaft is obtained by static and dynamic simulation.(4)In this paper,The innovation of the principle of air separation is applied to the separation of membrane mixtures.Based on the flow field simulation of horizontal air separation chamber,it is concluded that wind speed and pressure are more stable and less attenuation along the direction of the air pipe.The experimental results show that the separation rate of residual film increases with the increase of airflow velocity,but the content of residual film increases linearly,which is easy to cause the problem of sundries clogging the air chamber.Aiming at the problems found in the horizontal air separation chamber test,the air separation chamber is improved to an upswing structure.Through the simulation of the flow field of the upwind air separation chamber and the verification test of the air separation,the experimental results show that: Under the same wind speed condition,the separation rate of the upwind air separation chamber is lower than that of the horizontal air separation chamber by 13.1 and the impurity content of the residual film is reduced by 46.4 percent,which effectively improves the problems of the residual film impurity height and the clogging of the wind chamber after the air separation.Considering comprehensively,the upwind air separation.