Design and experiment of tooth chain compound residual film recovery machine

In order to solve the problems such as the missed picking up of the film pickup mechanism of the swing rod driven residual film recovery machine and the returning of the film unloading mechanism with the mulch film, and optimize the structure of the machine, the tooth chain compound residual film recovery machine was designed. Tooth chain film pickup mechanism and rod-tooth film pickup mechanism were adopted in the tooth chain compound residual film recovery machine which cooperate with each other to improve the film pickup rate, the fixing scraper type film unloading mechanism was used to solve the problem of return in the process of residual film unloading. Through the analysis of working principle and dynamics of film pickup and unloading mechanism, the movement track and equation of film pickup mechanism were obtained, and the conditions of picking, conveying and unloading of residual film were determined. In order to determine the optimum structure and working parameters of the tooth chain compound residual film recovery machine and optimize the structure of the machine, the three-factor and three-level response tests of this machine were carried out. Three factors were taken as test factors: the machine advancing velocity, the depth of pickup tooth into soil, the speed ratio of the tooth chain film pickup mechanism to the rod-tooth film pickup mechanism (speed ratio), and the film pickup rate and the film wrapping rate were taken as test indexes. The quadratic regression models of each factor on film pickup rate and film wrapping rate were established by using Design-Expert data analysis software. The significance of each factor on film pickup rate and film wrapping rate was analyzed. The results showed that the significant effects of the experimental factors on the film pickup rate were that speed ratio > the machine advancing velocity > the depth of pickup tooth into soil, and the significant effects on the film wrapping rate were: that the machine advancing velocity > the depth of pickup tooth into soil > speed ratio. The optimum working parameters were determined as follows: the moving speed of the machine was 0.9 m/s, the depth of pickup tooth into soil was 42 mm, and the speed ratio was 0.6. According to the optimized test parameters, the field verification tests were carried out. The results showed that the film pickup rate was 87.2% and the film wrapping rate was 1.6%. The experimental results had little difference with the theoretical optimum values, and the optimization model was reliable. The research results could provide reference for the selection of the optimum working parameters of tooth chain compound residual film recovery machine.