Design And Experiment Of Alternated Multi-sieve Device With Function Of Separating Soil From Residual Film Mixture

In the process of resource utilization of residual film,no matter the process flow such as melting granulation or hot pressing plate,there are strict restrictions on the content of soil in the film.At present,the recovery of residual film in cotton fields in Xinjiang is dominated by mechanized methods.However,there is a serious phenomenon of residual film wraps much soil in the mechanically recovered residual film.The high content of soil in the film has made it difficult to use residual film as a resource.In order to solve the above problems,the design and experimental research of the alternated multi-sieve device with function of separating soil from residual film was carried out.This paper took the machine-recovered materials from the Xinjiang cotton field as the research object,analyzed the characteristics of the cotton stalk,residual film,soil and other materials in the mechanicalrecovered film,and designed a alternated multi-sieve device with function of separating soil from residual film mixture.Kinematics and dynamics analysis of sieve and residual film mixture were carried out to determine the characteristic conditions that affected the movement of the screen surface materials.Through experiments,the influence law of device structure parameters and working parameters on soil screening and film stalk transportation performance was obtained.In order to improve the screening efficiency of membrane impurities and the removal rate of membrane impurities,the structure and working parameters of the membrane impurities removal device were optimized.The main research work and conclusions were as follows:(1)Field investigations were conducted in the post-autumn cotton field for mechanical recovery of residual film materials and complete sets of equipment for the initial cleaning of residual film processing enterprises,and obtained the average mass ratio of residual film-soil-cotton stalks in the residual film recovered in the season,size parameters,and soil moisture content in the film impurities data.Combined the characteristics of the membrane impurities and the technical requirements of the membrane impurities removal device,the overall plan of the soil removal device was determined.The device is mainly composed of 2 crankshafts,sieve body,motor,and frame.The body movement can complete the operation of throwing and conveying the residual film and cotton stalks and removing soil at one time.(2)The key component of the soil removal device was theoretically analyzed.Based on the kinematic analysis of the sieve body,the sieve body motion equation was established.Combined with the force analysis of the film and sundries on the screen surface,the characteristic values of the movement of the film and sundries on the screen under different motion states were obtained.Analyze the movement of the membranesoil material during the throwing process,and obtained the movement trajectory of the soil and the residual membrane at different times.(3)Determine the structural parameters of the device on the basis of theoretical analysis.The modal analysis of the crankshaft and the frame was carried out using ANSYS software,and the critical conditions for the resonance of the crankshaft and the frame were obtained.The Solid Works software was used to assemble the crankshaft,the screen body and other key components and analyze the motion calculation examples to verify the motion interference,safety and reliability of the device.(4)Established a three-dimensional model of the membrane impurity removal device and debugged the prototype.The operating parameters of the soil removal device were optimized through performance tests.The crankshaft speed,the inclination angle of the screen surface,and the amplitude of the screen body were used as the test factors.The screening efficiency of the film and the removal rate of the film were used as the test indicators.The Box-Behnken test design method was used to carry out three-factor three-level response surface test.Design-Expert software was used to analyze the of test results,and obtained the best combination parameters of the membrane impurity removal device: crankshaft speed 177 r/min,screen surface inclination12°,screen body amplitude 140 mm,the test results shown that the removal rate of membrane impurities was86.5%,and the screening efficiency of membrane impurities was 995.6 kg/h.The research results can provide a reference for improving the separation quality of membrane impurities in the process of resource utilization of residual membranes.