Design and Testing of Discrete Element-Based Counter-Rotating Excavation Device for Cyperus esculentus

Zhuang Zhao, Xiaoning He, Shuqi Shang, Jialin Hou, Hao Zhu, Haiqing Wang, Yuetao Wang, Dongjie Li, Zengcun Chang, Chao Xia and Dongwei Wang ()
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Zhuang Zhao: College of Mechanical and Electronic Engineering, Shandong Agricultural University, Taian 271018, China
Xiaoning He: College of Mechanical and Electrical Engineering, Qingdao Agricultural University, Qingdao 266109, China
Shuqi Shang: College of Mechanical and Electrical Engineering, Qingdao Agricultural University, Qingdao 266109, China
Jialin Hou: College of Mechanical and Electronic Engineering, Shandong Agricultural University, Taian 271018, China
Hao Zhu: College of Mechanical and Electrical Engineering, Qingdao Agricultural University, Qingdao 266109, China
Haiqing Wang: College of Mechanical and Electrical Engineering, Qingdao Agricultural University, Qingdao 266109, China
Yuetao Wang: College of Mechanical and Electrical Engineering, Qingdao Agricultural University, Qingdao 266109, China
Dongjie Li: College of Mechanical and Electrical Engineering, Qingdao Agricultural University, Qingdao 266109, China
Zengcun Chang: College of Mechanical and Electronic Engineering, Shandong Agricultural University, Taian 271018, China
Chao Xia: College of Mechanical and Electrical Engineering, Qingdao Agricultural University, Qingdao 266109, China
Dongwei Wang: College of Mechanical and Electrical Engineering, Qingdao Agricultural University, Qingdao 266109, China

Agriculture, 2022, vol. 12, issue 10, 1-24

Abstract: Currently, the mechanized harvesting method of Cyperus esculentus is mainly based on rotary excavation, but there are problems such as high working resistance, high damage rate, and high buried fruit rate in the working process. This paper focuses on the analysis of the movement trajectory of the positive-rotating and counter-rotating Cyperus esculentus excavation device, establishes a agglomerate model of soil- Cyperus esculentus tuber- Cyperus esculentus root system-mechanism, and conducts discrete element simulation tests on Cyperus esculentus agglomerates under different soil layers. According to Expert test optimization, the optimal structural parameters of the counter-rotating blade are determined: the radius of gyration is 151 mm, the inclination angle of the cutting edge is 42.5°, and the working width is 318 mm. The comparative test of the positive-rotating rotary tillage method under the optimal structural parameters shows that the working resistance is reduced by 11.25%, and the torque of the tool shaft is reduced by 16.11%, which proves that the designed anti-rotation excavation structure has the effect of reducing resistance. To further test the harvesting performance of the Cyperus esculentus excavation device, field harvesting tests were conducted, and the results showed that the buried fruit rate of the counter-rotating excavation device was reduced by 11.6%, and the damage rate was reduced by 6.1% year-on-year. This study shows that the design of the counter-rotating excavation device can further improve the harvesting performance of Cyperus esculentus based on reduced resistance harvesting and meet the requirements of Cyperus esculentus harvesting.

Keywords: counter-rotating excavators; Cyperus esculentus agglomerate; discrete element method; discrete element modeling (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: 2022
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