| Design and test of potato haulm cutter at the harvest |
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| DOI：10.7606/j.issn.1000-7601.2019.02.36 |
| Key Words: cutting of potato haulm cutting blade saw-tooth cutting with equal sliding angle harrest |
| Author Name | Affiliation | | LI Xiao-jun | College of Mechanical and Electrical Engineering,Gansu Agricultural University,Lanzhou, Gansu 730070,China
Gansu Polytechnic College of Animal Husbandry ＆ Engineering,Wuwei, Gansu 733006,China | | SUN Wei | College of Mechanical and Electrical Engineering,Gansu Agricultural University,Lanzhou, Gansu 730070,China | | ZHANG Tao | Agronomy College, Gansu Agricultural University,Lanzhou, Gansu 730070,China | | WANG Hu-cun | College of Mechanical and Electrical Engineering,Gansu Agricultural University,Lanzhou, Gansu 730070,China | | ZHANG Dan-zhu | College of Mechanical and Electrical Engineering,Gansu Agricultural University,Lanzhou, Gansu 730070,China |
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| Abstract: |
| The existing machine for cutting potato haulm has some problems such as excessive cutting resistance,easy haulm entangling,and excessive fuel consumption. In order to solve these problems, a mathematical model for cutting type, speed, height and strength was established based on the principle of Box-Behnken test design and using the cutting strength of potato haulm as an indicator.The results showed that the cutting type and height had very significant effects on the cutting strength of potato haulm (P＜0.001). The cutting speed also had significant influence on the cutting strength (P＜0.05). This paper established a logarithmic spiral equation to further optimize saw-tooth blade. We designed a special equal slide-cutting angel saw-tooth blade for cutting potato haulm.The experiment of cutting and crushing potato haulm during harvest stage was carried out and compared with reference indexes. The results showed that under the same cutting conditions the qualified crush rate was increased by 16.7%and the rate of tuber-pullout was 0.15% compared with the ordinary blade and the stubble height was 45 mm. The stress was uniform in the process of removing haulm. The new design significantly reduced the fuel consumption and improved the cutting efficiency. This research has important significance in improving the performance of cutting machine for potato haulm. |
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