| Xinjiang is a major cotton-producing area in my country.The popularization of film mulching technology has greatly increased cotton production.However,for a long time,it has been neglected to recycle the residual film of the plough layer of the cotton field,resulting in a large amount of film residue in the soil,causing serious pollution to the cotton field environment.The residual film recovered by most of the current plough layer residual film recovery machines contains a lot of impurities.In order to solve the problem of plough layer residual film recovery and membrane impurity separation,this paper is the basis of the pneumatic removal type plough layer residual film recovery machine designed by this research group in the early stage Above,in order to solve the problems of uneven suction of the machine’s suction film port,high residual film impurity rate,and low residual film recovery rate,the gravity sedimentation chamber,film suction device and film collecting box were optimized and designed.Through field experiments,single factor and Multi-factor experiments to verify the performance of the machine and to optimize the design of a comb-tooth film-pneumatic film-removal-type plough layer residual film recovery machine.(1)Through the investigation of cotton fields in southern Xinjiang,according to the wide and narrow row dense planting pattern(66+10)cm widely used in southern Xinjiang,field samples were selected,and the residual film,cotton stalks,and small rocks in the samples were selected.The suspending speed of slab is measured,and the test shows that the suspending speed of residual film is in the range of 0.8～1.5m/s,the suspending speed of cotton stalk is in the range of 5.9～10.2m/s,and the suspending speed of small rocks is in the range of 8.9～12.8m /s.(2)According to the cotton field planting mode in southern Xinjiang and the suspension speed of residual film,cotton stalks,and small rocks,the overall design of the machine is optimized,including the theoretical design and parameter selection of key components such as gravity sedimentation chamber,centrifugal fan,and film collecting box.(3)Through the use of Fluent simulation software to simulate and analyze the velocity and pressure distribution of the gravity sedimentation chamber under the conditions of different inlet wind speeds,and analyze the velocity and pressure distribution cloud diagrams,the influence laws of three kinds of demeanors on the separation of membranes and the effect of residual membrane transportation are obtained.The simulation test results show that when the wind speed of the film suction port is 15m/s,the combined effect of the separation of the movement process of the membrane and the transportation of the residual membrane in the gravity sedimentation chamber is the best.(4)Field tests were conducted on the machine,and the main factors were the air speed of the film suction port,the rotation speed of the film forming roller and the machine operating speed.Through the secondary regression center combination design test,the main parameters of the film suction port wind speed,the film forming device speed and the machine operating speed were obtained.The mathematical model of the residual film recovery rate and the influence of the impurity rate is combined with the mathematical model to conduct a response surface analysis.The test results show that: the wind speed of the film suction port is 15m/s,the rotation speed of the filming device is 140r/min,the machine operating speed is 4km/h,the average residual film recovery rate of the optimal parameter combination is 66.8%,and the average residual film impurity rate At 6.49%,compared with the air suction plough layer residual film recovery machine developed earlier,the residual film recovery rate is increased by 11.76%,and the impurity rate is reduced by 1.81%. |
