Design And Experiment Of Trommel With Function Of Separating Soil From Residual Film Mixture

As an important cotton production base in China,The natural environment has led to the widespread use of agricultural films in Xinjiang.The widespread use of agricultural films has produced a large amount of residual films,which is causing increasingly serious pollution.With the continuous promotion of residual film pollution control,the residual film in Xinjiang’s cotton fields is now generally mechanised for recycling,but the high soil content in the recovered film debris and the serious residual film-soil wrapping phenomenon make it difficult for the residual film to be directly utilised for resource recovery.In response to this problem,a trommel with function of separating soil from residual film mixture was designed and developed and tested.This research takes the residual film mixture by mechanical recovery in Xinjiang cotton fields as the research object,determines some material characteristics of the residual film mixture by mechanical recovery through experiments,and determines the overall scheme of the device by combining the process needs and technical requirements of the residual film resource utilization,carries out kinematic and kinetic analysis of the residual film mixture by mechanical recovery,obtains the motion characteristics of the residual film mixture by mechanical recovery screening process,and designs the key components of the device,builds a test platform,and obtains the optimal combination of parameters of the device through response surface tests with the soil removal rate,film leakage volume and work efficiency as evaluation indexes.(1)On-the-spot investigation of the current situation of residual film recovery in Xinjiang cotton fields and the technological requirements for the utilization of residual film resources,the mass proportion of each component in cotton field machine-recovered film waste and the data of residual film,soil,cotton straw geometric dimensions and other data were obtained.The mass ratio of residual film in the film harvesting waste was 17.94±2.21 %,the mass ratio of crop residues dominated by cotton straw was 24.48± 5.26 %,and the mass ratio of soil was 57.58 ± 5.42 %;The frictional mechanical properties of the residual film and soil in the residual film mixture by mechanical recovery were studied separately through tests,providing a basic basis for the design of the device.(2)Combined with the technical requirements of the machine with function of separating soil from residual film mixture and the demand for resource utilization of residual film,the overall scheme is determined,and the device mainly consists of screening parts,transmission parts and frame and other parts.The theoretical analysis of the motion of the residual film mixture in the device,combined with the analysis of the force of the residual film mixture in the axial and radial direction of the screen body,determine the motion characteristics of the residual film mixture in the device under different motion conditions,on this basis to establish the equation of motion,to obtain the influence of the dynamic friction factor,rotational speed and the sieve radius on the motion characteristics of the residual film mixture.(3)Combined with the characteristics of the residual film mixture by mechanical recovery,on the basis of meeting the needs of the residual film mixture screening and soil removal process,the design of key components,determine their structural parameters,and the shaft components for stiffness checks;Solid Works software for three-dimensional modelling of the frame,using ANSYS workbench 17.0software for modal analysis of the frame,to obtain the first six orders of frequency of the frame.The analysis results show that the frame structure is stable and reliable.(4)It was determined that the rotational speed of the trommel,the feeding speed,the inclination angle of the trommel and the pitch of the spiral blade were the test factors,and the soil removal rate,the rate of the leakage of residual film and the work efficiency were the test indicators,and a four-factor,five-level quadratic regression test was conducted according to the Central-Composite-Design test design principle.The optimum combination of the following parameters was obtained: the rotational speed of the trommel,the feeding speed,the inclination angle of the trommel and the pitch of the spiral blade are 24.80 r/min,11.43 kg/min,-2°,694.99 mm.With this combination of parameters,the device has the soil removal rate of92.48%,the rate of the leakage of residual film of 3.31 g and the work efficiency of 7.61 kg/min.The results of this study can be used as a reference for the design of related soil removal devices.