Xingjiang Academy of Agricultural science

Urunchi, China

Xingjiang Academy of Agricultural science

Urunchi, China
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Zhang J.,Xinjiang Agricultural University | Zhang L.,Xingjiang Academy of Agricultural science | Liu X.,Xingjiang Academy of Agricultural science | Jiang Y.,Xingjiang Academy of Agricultural science | Wang J.,Shihezi University
Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering | Year: 2017

In the pollution controlling of the residual plastic films in the farmland, due to the lack of preferable side-film shovel mechanics in autumn plastic film recycling, the side-film can't be recycled by the side-film shovel but be buried under the ground surface. A large amount of residual plastic film into soil due to long-term using film on the crops has caused great serious influence on the high quality of farmland planting, crop growth, the rural ecological environment. The side-film accounted for 16% of the whole plastic film, which would result in the lower recovery rate for plastic film recycling and the recovery rate was generally maintained at about 80%, nearly 20% of the plastic film still remained in the soil, which caused definite pollution to the soil and the environment. Current research on the recovery mechanism is limited to the equipment of plastic film enwinding recycling itself. In order to solve these problems, the more widespread used mechanics for collecting the side-film was chosen such as furrow opener and double wing shovel. Then the mechanical analysis of one wing shovel newly designed was carried out with opener and double wings shovel. The forces of collecting the side-film were compared among three different structural shovels and the field contrast tests were carried out in Yuli county, Korla city in Xinjiang. The working performances of different side-film collecting shovels were compared in the field test. The three key factors were assessed about the integrity rate, film recovery rate and no heap soil phenomenon of residual plastic film. Results showed that the force of the side-film shovel taken was related with the angle into soil and blade length of the side-film shovel during the shovels picking the side-film. According to analyze the force of three types of shovels, we gained the balance equation, the equation involved some kinds of forces, such as the friction along the slant, the normal load along the slant, the shear force of soil internal shear failure, the friction force between the internal soil and the accelerating force of soil movement. Theoretical analysis of three side-film shovels showed that the force of one wing shovel was maximum while the stress of furrow opener device was minimum, the stress of double wing shovel was relatively reasonable. However, the performance effect of the one wing shovel was the best in the field testing although the force of one wing shovel was maximum. The integrity rate of the side-film was reached at 100%, the film recovery rate was at 95.4%, and without obstructing the soil in working performance. Taking the prominent operational effectiveness into account, the one wing shovel was highly recommended as autumn residual side-film recovery machine of the plastic film collecting structure. The research results can be provided a reference for the design of the side-film collecting mechanism section during the whole residual film recovery machine and also provide theory basis for the development of the plastic film recycling machine. © 2017, Editorial Department of the Transactions of the Chinese Society of Agricultural Engineering. All right reserved.


Zhang J.,China Agricultural University | Zhang J.,Xingjiang Academy of Agricultural science | Wang X.,Xingjiang Academy of Agricultural science | Zhang L.,Xingjiang Academy of Agricultural science | And 8 more authors.
Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering | Year: 2015

Plastic mulching technology has brought huge economic benefits, while the residual plastic film produced series of serious problems such as pollution on land. A large number of plastic recycling is becoming urgent and important task in our country. A large amount and long term of used plastic film on soil has caused great serious influence on the high quality of farmland planting, crop growth, the rural ecological environment and new rural construction, which has attracted more and more attention. Now, the research on the recovery mechanism is limited to equipment of plastic film enwinding recycling, and there are few studies on the variation rule of the tensile properties of used plastic film and the impact. During our practical research work, performance such as unstable recycling capability, low film recovery rate and work parts deformation often appears in the used plastic film recycling. To address these problems, we carried out some field experiments. The series tests were conducted in Da West village, YuLi County in Korla, Xinjiang from March to October in 2014, including the test of tensile properties of plastic film changes in different thickness, time and direction by 0.01 mm plastic film enwinding recycling. The methods were as follows: Firstly, each sampling point, which are not very far with previous sampling point, were carried on hard, dry and flat land, and taken complete plastic film without damage. The sampling work should be conducted on the large space line, and the sampling point be as close as to the plants. Four plastic films with different thickness were selected with the width and length were 600 mm and 200 mm respectively. The tensile properties of plastic films were tested with CMT6000 electronic universal testing machine. Secondly, three-dimensional modeling and motion analysis were completed for the machine of retrieving by solid works software. According to the measure of maximum tensile force with payback time, the tensile force was contrasted with the sum of ground and slope in wrapping recovery. The result showed that the maximum tensile force was less than the twine. Finally, the recycling test was carried out with wrapping in 0.01 mm film, but the film fractured from time to time. The wrapping recovery could not meet the demand of 0.001 mm film. The results of field experiments showed that the tensile strength of used plastic film had dropped obviously for the wind and ultraviolet irradiation after 30 to 60 days laying the plastic film. The maximum tensile stress of 0.01 mm plastic film was 1.52 N, which was close to the plants and 1.305 N, which was far from the plants; and the stress was 1.4 times and 1.22 times of 0.008 mm plastic film, respectively. The maximum tensile strength of mulch film on the longitudinal direction was generally higher about 1/3 than the transverse direction of the mulch film. So the recycling aparts should be along the direction of laying the plastic film. The tensile properties of 0.01 mm plastic film had made a certain improvement compared to 0.008 mm, which were some helpful for plastic film recycling. However, by the theoretical calculation and field test of the experiment on 0.01 mm plastic film enwinding recycling, the tensile properties of 0.01 mm plastic film were not satisfied with simple winding way. This study revealed the rule that the plastic tensile properties were affected by UV, etc. at different times, thickness and direction, which would provide theory basis for the development of the plastic film recycling machine. ©, 2015, Chinese Society of Agricultural Engineering. All right reserved.

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