Design and Experiment of Bionic Straw-Cutting Blades Based on Locusta Migratoria Manilensis

Jinpeng Hu, Lizhang Xu, Yang Yu (), Jin Lu, Dianlei Han, Xiaoyu Chai, Qinhao Wu and Linjun Zhu
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Jinpeng Hu: College of Agricultural Engineering, Jiangsu University, Zhenjiang 212013, China
Lizhang Xu: College of Agricultural Engineering, Jiangsu University, Zhenjiang 212013, China
Yang Yu: College of Agricultural Engineering, Jiangsu University, Zhenjiang 212013, China
Jin Lu: College of Agricultural Engineering, Jiangsu University, Zhenjiang 212013, China
Dianlei Han: College of Agricultural Engineering, Jiangsu University, Zhenjiang 212013, China
Xiaoyu Chai: College of Agricultural Engineering, Jiangsu University, Zhenjiang 212013, China
Qinhao Wu: College of Agricultural Engineering, Jiangsu University, Zhenjiang 212013, China
Linjun Zhu: Jiangsu World Agricultural Machinery, Danyang 212300, China

Agriculture, 2023, vol. 13, issue 12, 1-23

Abstract: Aimed at addressing the problems of the existing straw choppers on combine harvesters, such as a large cutting resistance and poor cutting effect, combined with bionic engineering technology and biological characteristics, a bionic model was used to extract the characteristics of the cutting blades of locusta migratoria manilensis’s upper jaw. A 3D point cloud reconstruction and machine vision methods were used to fit the polynomial curve of the blade edge using Matlab 2016. A straw-cutting process was simulated using the discrete element method, and the cutting effect of the bionic blade was verified. Cutting experiments with rice straws were conducted using a physical property tester, and the cutting resistance of straw to bionic blades and general blades was compared. On the whole, the average cutting force of the bionic blades was lower than that of the general blades. The average cutting force of the bionic blade was 18.74~38.23% lower than that of a smooth blade and 1.63~25.23% lower than that of a serrated blade. Similarly, the maximum instantaneous cutting force of the bionic blade was reduced by 2.30~2.89% compared with the general blade, which had a significant drag reduction effect. By comparing the time–force curves of different blades’ cutting processes, it was determined that the drag-reducing effect of the bionic blade lies in shortening the straw rupture time. The larger the contact area between the blade and the straw, the more uniform the cutting morphology of the straw after cutting. Field experiment results indicate that the average power consumption of a straw chopper partially installed with bionic blades was 5.48% lower than one with smooth blades, measured using a wireless torque analysis module. In this research study, the structure of the straw chopper of an existing combine harvester was improved based on the bionic principle, which reduced resistance when cutting crop straw, thus reducing the power consumption required by the straw chopper and improving the effectiveness and stability of the blades.

Keywords: combine harvester; bionic blade; incisor lobe of locusta migratoria manilensis; rice straw; cutting experiment (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2023
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