| Parameter simulation design and experiment of crossing device of covering soil on film |
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| DOI：10.7606/j.issn.1000-7601.2018.01.41 |
| Key Words: device of covering soil on film scraper lifting chain discrete element method response surface methodology |
| Author Name | Affiliation | | LI Di | College of Engineering, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | SUN Wei | College of Engineering, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | SHI Lin-rong | College of Engineering, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | ZHANG Hua | College of Engineering, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | LIU Xiao-long | College of Engineering, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | WU Jian-min | College of Engineering, Gansu Agricultural University, Lanzhou, Gansu 730070, China |
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| Abstract: |
| The mechanical device of covering soil on film with scraper lifting chain was designed to solve the problems including such as wind damage susceptible, burning seedlings, stemming emergence, which caused by the poor covering soil quality of device in whole plastic-film mulching planting pattern. In order to improve the working performance of covering soil mechanism, the entity model of this device was constructed. Using discrete element method to simulate experiment, combined with the experimental design principle of Box-Behnken, and applying response surface methodology with three factors and three levels, the quadratic regression models about width of covering soil and the qualified rate of covering soil thickness were built using Design-Expert software. Through analyzing the influence of factor's interaction on experimental aim, the best combination of parameters are proposed as follows: the ratio of chain speed and operating speed, 1.38; the height of dumping soil, 200 mm; and the width of dumping soil, 120 mm. Field experiment showed that the width of covering soil a
nd the qualified rate of covering soil thickness simulated by discrete element method were close to the average value of repeated test, and it meet the agronomic requirement, thus providing theoretical basis for the design and improvement of the covering soil device. |
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