Design and Experimental Analysis of Straw Suction Unit on Straw Cover Weight Detection Machine

Rongrong Li, Hongwen Li (), Caiyun Lu, Chao Wang, Zhengyang Wu, Zhenwei Tong, Di Liu and Shan Jiang
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Rongrong Li: College of Engineering, China Agricultural University, Beijing 100083, China
Hongwen Li: College of Engineering, China Agricultural University, Beijing 100083, China
Caiyun Lu: College of Engineering, China Agricultural University, Beijing 100083, China
Chao Wang: College of Engineering, China Agricultural University, Beijing 100083, China
Zhengyang Wu: College of Engineering, China Agricultural University, Beijing 100083, China
Zhenwei Tong: College of Engineering, China Agricultural University, Beijing 100083, China
Di Liu: College of Engineering, China Agricultural University, Beijing 100083, China
Shan Jiang: College of Engineering, China Agricultural University, Beijing 100083, China

Agriculture, 2023, vol. 13, issue 11, 1-22

Abstract: In response to the issues of high cost, limited detection accuracy, and significant measurement errors inherent in conventional manual techniques used to measure straw cover weight under the conservation tillage method, a dedicated straw cover weight detection machine was developed in the current study. This machine included a critical straw suction device that utilizes negative pressure to collect straw within a defined area. The efficiency of straw collection is affected by suction chamber structural parameters and transport pressure. With crushed corn straw as the research subject, the theoretical calculation of straw suspension velocity was used to determine the wind duct diameter, perform the initial design of the suction chamber structure, and select the appropriate fan. After conducting preliminary experiments, single-factor optimization tests, and orthogonal rotation experiments, we analyzed the flow field distribution patterns and identified the critical parameters for the straw cover weight suction unit. We found that the fan should operate at a speed of 2900 r/min, the diameter of the straw outlet should be 200 mm, the vertical height of the suction chamber should be 536 mm, and the bottom diameter of the suction chamber should be 800 mm. The optimization results were validated through simulation tests and bench tests, yielding an average near-ground airflow velocity of v j = 9.03 m/s and an average outlet airflow velocity of v o = 34.27 m/s, meeting the basic requirements of the suction unit. This study could provide a new approach and technical support for the automated detection of straw cover weight in conservation tillage areas.

Keywords: straw cover weight; detection; straw suction unit; CFD simulation; bench test; conservation tillage (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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