| Plastic film mulching technology is widely used in arid area of Northwest China an agricultural technology, plastic mulch can improve soil temperature and destroy weeds, improve the drought resistance of crops, with thermal insulation, moisture, and soil conservation, fertilizer effect, on crops have remarkable effect on increasing production. But because the recovery is not timely, large amounts of residual film exists in the soil, resulting in the change of soil physical structure and soil moisture and nutrient in the downward migration is hindered, the soil porosity and permeability decreased, which not only hinder the exchange of soil with the outside air moisture, normal planting and growth of crops, but also reduce the work of the agricultural efficiency. Dry windy climate region of Northwest China exacerbated the "white pollution", affect the production and life of the residents. The universality of the application of agricultural plastic film and the distribution of residual plastic film are widely used, so that the difficulty of recycling and reuse is increased, and the benefit is not high. After the use of broken residual film will adhere to a large number of soil and crop decay of the roots and leaves, the membrane and the separation is difficult. At present, domestic most of the residual film recovery machine uses stripping method for eccentric telescopic rod or gas ceiling / gas blowing type, but collecting plastic film is more dispersed, recovery rate is not high, and prone to card film and stripping difficult problem however the residual film recovery in most areas rely mainly on artificial picking and simple machinery, time-consuming and laborious, operation efficiency and recovery rate is low. Existing for Gansu Province remnant membrane recycling technology lags behind, mechanical recycling serious gap can not meet the practical needs of production in Gansu Province. To this end, the subject of the existing problems in the recovery of residual film and the actual situation of Gansu residual film recycling. To increase the rate of the residual film recovery. Design and research of the a suitable for dry farming areas in Northwest residual film collecting machine, the machine adopts gate fork up membrane components, tapered pick roll film drum device and rake rake tooth membrane components, determined by calculating the membrane device and pick roll film device of various key parameters.The detailed design and research contents are as follows:(1) By the residual film recovery machine play film shovel mechanism design research to determine the main parameters, the use of software Soil Works to film shovel solid model is set up, and with the help of ANSYS software to play film shovel is different is applied in the direction of load structure deformation and stress concentration for static analysis. The analysis results show that the maximum deformation of the film shovel to 0.22 mm at the blade tip, the minimum deformation is 0 mm at the end of the shovel, the maximum stress of 2.03 MPa in the tail of the film shovel, but far less than the maximum allowed by the stress.(2) By the residual film recovery machine conical pick roll film and the mechanism design study to determine the main parameters, using Solid Works software of conical pick roll film and solid model is set up, and with the help of Pro / E software of conical pick roll film and motion simulation, the trajectory analysis to determine optimal roll film speed.(3) According to the lamination assembly structure design to determine the main parameters and its crushing clods process in carries on the stress analysis; according to rake rake film tooth main properties determined the key parameters.(4) According to the design of key components of the machine for collecting plastic film residue identified residual film recovery machine frame structure, in accordance with the frame structure and the East is red- 300 tractor power output to determine the residual film recovery machine power transmission scheme, and design and calculation of transmission scheme.(5) Mainly to determine the test purpose, test conditions and design the test plan, test is carried out to study the residual film recovery machine, clear the test indexes for residual film recovery rate, through the analysis of the obtained are mainly three factors influencing test index. According to the factors that affect the use of 3 levels of 3 factors, the test program using L27(313) orthogonal test table to arrange the results of the test. The effect of various factors on recovery rate of residual film was determined by range analysis, variance analysis and comprehensive analysis. The optimum test parameters for soil moisture content 12.5%, starting from the 320 N film shovel resistance, machine forward speed of 12.5 km/h, the residual film recovery effect is the best. The results of the field experiment showed that the recovery rate of residual film could reach 90.9%. Obviously,this machine can meet the requirement in the dry farming area in Northwest china.These operating procedures as picking film,rolling film,compacting film,removing film and collecting film can be completed in one time by this new machine.The residual film recovery machine provides an prevent clogging,low power consumption and high recovery rate of the residual film recovery. Greatly alleviate the problem of the shortage of rural labor during busy seasons,is of great significance to China’s economic development and ecological protection. Also reduce the labor intensity of farmers,increase farmers’ income has important practical significance. |