Design And Test Of The Pickup And Automatic Film Removal Device For Broken Residual Film

Plastic film mulch is an agricultural farmland cultivation technology,which has the functions of increasing temperature and moisture,moisturizing and protecting fertilizer,preventing diseases and insects,and suppressing weeds.This cultivation technology has brought earth-shaking changes to agricultural production.To remove polyethylene,it is not perishable and difficult to decompose,and it is easy for residual soil to cause ecological pollution.It destroys the soil structure and hinders the transportation of crop water and nutrients.Therefore,the use of mulch film brings us considerable economic benefits,as well as ecological environment The sustainable development of China has brought huge challenges.The soil moisture in the field in the south is too high and the residual plastic film after the operation is more in the form of fragmented and small pieces of broken residual film,which is not easy to recover,and the current mechanical recovery will still cause a large amount of broken residual film to remain on the surface of the land.It affects the normal growth and development of crops,and also makes it difficult to recover the broken residual film.Therefore,the recovery of broken residual film is imminent.At present,there are nearly one hundred kinds of domestic residual film recycling machines,but these machines have a single applicability,and the film collection methods used are mostly gear tooth type,air suction type and tooth chain type,etc.,which cannot meet the constantly changing crops and the complexity of the southern terrain.And the recovery rate of small block mulch is not high.At present,there are dozens of types of domestic key stripping mechanisms.The manual picking up of broken residual membranes is very difficult and cumbersome.The one-time stripping mode is mostly used for the whole film,and there is little research on the recovery of broken residual film.Moreover,domestic pickup machines and automatic stripping devices often have stuck film,the broken residual film is easy to entangle,and it is difficult to remove the film.The phenomenon of low film removal rate.Therefore,in view of the above problems and the actual situation faced by farmland operations in southern China,this project combines the existing agronomic existing residual film recycling machines and the deficiencies of these tools to improve the removal of broken film Due to the problems of low rate and easy winding,we designed a farmland broken residual film recovery machine with simple and compact structure,easy processing and manufacturing,high film removal rate,low winding rate,high film-soil separation rate and double film removal function.The main research contents are as follows:(1)Through the measurement of the physical characteristics of the broken residual film,the characteristics of the soil,and the research on the agronomic characteristics of the plastic film laying,the use of the southern plastic film and the residual situation of the broken residual film are obtained,and the broken residual film at different periods,including spring film and autumn membrane.The difference in mechanical properties,the tensile properties and elongation of the residual film of different thicknesses were measured by the relevant measurements of the use of plastic film in the farmland and the coverage of the film soil.The film thickness of the southern film was 0.006 ～ 0.018 mm,all use colorless transparent film,a small amount of dark film.The basic specifications of the ridge width of the mulching film are: ridge bottom width 600-800 mm,ridge height 100-200 mm,ditch width 200-300 mm,and ridge line spacing 1000 mm.The actual parameters of farmland soil firmness and soil moisture content were obtained by five-point sampling method for soils with farmland soil depths of 0-50 mm,50-100 mm,and 100-150 mm,respectively.(2)The structural design of the complete machine for picking up broken film.Combined with the agronomic and physical characteristics of the residual film laying,Design can be divided into a three-point suspension device frame and bevel gear It is composed of gearbox,film tying device,film removing device,film removing conveying device and film collecting box.The stripping device and the stripping conveying device are the key design parts of the machine,which are the primary stripping and the secondary stripping,respectively.The first stripping is completed by the film tying device and the stripping device.The film drum and comb-toothed film scraping blades are combined.The second film removal is completed by the film removal device and the film removal conveyor.The film removal conveyor is composed of the film removal conveyor belt and the film removal column.As power output.(3)Finite element analysis and optimization of key components of the broken film picking machine.Using PRO / E three-dimensional software to carry out solid modeling of the broken residual film picking machine to verify the feasibility of its design,and provide reliable parameters for subsequent machine tool manufacturing.Ensure the reliability of the two stripping device.Through the ANSYS,the finite element static analysis of the broken residual film picking and tying device was carried out to optimize the structural size of the key components.After analyzing the movement trajectories of the bending elastic teeth of the binding film and the soil,the broken residual film was picked up Machine recycling effect.(4)Prototype production and test,prototype test for the effect of stripping: through single-factor and multi-factor tests,the evaluation index of broken residual film recovery rate,broken residual film stripping rate and entanglement rate is taken as The installation angle and walking speed of the stripping device are the influencing factors,mainly to solve the problem of the difficulty of stripping the film,which includes the problem of soil entrainment and the adsorption of the film soil with different water content.90 mm,travel speed of the machine is 5km / h,the installation angle of the stripping device is 25 °,the recovery rate of the broken residual film is higher than 90%,the broken residual film winding rate is lower than 4%,the broken residual film removal rate is higher than 94%,It solves the problem that it is difficult to remove the film in the process of recycling the broken residual film and easy to entangle.