Design And Experimental Study Of Pole-tooth Mulching Plastic Film Collector

Plastic film mulching planting technology is characterized by heat preservation and has been widely applied to the crop planting in China. With the use increase of mulching film, the halfway recycling gives rise to environmental pollution. Except in labor scarcity area of China, manual recycling is still the main way to recycle plastic film residue. Since manual recycling is time-consuming and laborsome, it is necessary to greatly advocate the mechanical recycling.To optimize the collecting film machine and increase the rate of collecting film, this thesis conducts the improved design on the telescopic pole collecting film machine and meanwhile performs the theoretical analysis, simulation and experiment research on the improved collecting film machine. The design consists of the following parts:(1) The pole-teeth end trajectory model was received by using the curve fitting of Matlab software,and generated the optimized trajectory of slide-way.The displacement, kinematics and dynamics analysis of slide-way pole-teeth collecting residual film mechanism were done, and the displacement,kinematics and dynamics models were established.finally,the kinetic equation of all the parts and a necessary condition for unloading residual plastic film were received by Kinematic Analysis of mechanism.(2) The contact of the residual film with pole-teeth and the rubber plate with pole-teeth was analyzed by nonlinear finite element method ,deformation and stress distribution of residual film with pole-teeth were received in the process of picking up film mulch and the deformation of rubber plate wih friction or without friction were received in the process unloading residual film.The three-dimensional model of pick-up residual plastic film mechanism and unloading residual plastic film mechanism were established by UG software,tracking the trajectory of end of pole-teeth,the speed and acceleration of all of parts at different speed ratios were analyzed,verified consistency of motion simulation and the theoretical analysis.(3) Static and contact mechanics analysis is conducted for the Pick-up residual plastic film mechanism and Unloading residual plastic film mechanism by means of ANSYS Workbench.Through the statics analysis of mulching film pole teeth as well as pole tooth shaft,it concluded that the maximum stress point is at the root of tooth 554.64Mpa,less than the yield limit of material 1225Mpa.Through the contact analysis of rubber plate with pole teeth,it conclude that the maximum deformation point is at the edge of rubber plate 43.882mm,the maximum stress exists in the joint of rubber plate and unloading residual plastic film roller,2.06×10-2MPa,the working strength of machine meets the requirments.(4) Checked the pole tooth end trajectory by using the high-speed photography experiment and measure the deformation of pick-up residual plastic film mechanism when the machine run.The rubber plate distortion range from 42.126 to 49.733mm in the process unloading residual film,the deformation met the requirments.(5) In order to determine the film picking rate reached the optimal value of the working parameters,respectively for orthogonal expriment. The results indicate that the variation of speed ratio have greater influence to machine performance compared with that of machine operating speed and the embedded depth of the Spring-tooth. Moreover, the collection ratio of mechanism could reach the optimal when the machine operating speed was 0.85m/s, the speed ratio was 1.5, and the embedded depth of the Spring-tooth for lifting film was 50 mm.