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Design and Parameter Optimization of a Rigid–Flexible Coupled Rod Tooth Threshing Device for Ratoon Rice Based on MBD-DEM

Author

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  • Weijian Liu

    (Key Laboratory of Modern Agricultural Equipment and Technology, Ministry of Education, Jiangsu University, Zhenjiang 212013, China)

  • Xuegeng Chen

    (Key Laboratory of Modern Agricultural Equipment and Technology, Ministry of Education, Jiangsu University, Zhenjiang 212013, China)

  • Shan Zeng

    (College of Engineering, South China Agricultural University, Guangzhou 510642, China)

Abstract

To solve the problem of the high loss rate of threshing devices during the mechanical harvesting of ratoon rice, we propose a method using the principle of rigid–flexible coupling in this paper to reduce losses. Through analysis of the forces and collisions on ratoon rice grains during the threshing process, it has been confirmed that changing the structure and materials of the threshing contact components can effectively reduce grain loss. A rigid–flexible coupling rod tooth was designed, and the overall structural parameters of the device were determined based on force analysis results and dimensional boundary conditions. The MBD-DEM coupling method was used to simulate the threshing process, and the force conditions of the threshing rod teeth and threshing drum were obtained. The influence of the feeding amount and of the flexible body thickness on the crushing of ratoon rice grains was analyzed. In order to obtain the device’s optimal parameter combination, a three-factor quadratic regression orthogonal rotation combination experiment was conducted with drum speed, flexible body thickness, and rod tooth length as experimental factors. The optimization results showed that when the drum speed, flexible body thickness, and rod tooth length were 684 r/min, 3.86 mm, and 72.7 mm, respectively, the crushing rate, entrainment loss rate, and uncleaned rate were 1.260%, 2.132%, and 1.241%, respectively. The bench test showed that it is feasible to use the MBD–DEM coupling method to measure the motion and force of ratoon rice. The rigid–flexible coupling threshing device can reduce the grain crushing rate while ensuring grain cleanliness. Compared with traditional threshing devices, the crushing rate and entrainment loss rate of the rigid–flexible coupling threshing device were reduced by 55.7% and 27.5%, respectively. The research results can provide a reference for the design of threshing devices for ratoon rice harvesters.

Suggested Citation

  • Weijian Liu & Xuegeng Chen & Shan Zeng, 2024. "Design and Parameter Optimization of a Rigid–Flexible Coupled Rod Tooth Threshing Device for Ratoon Rice Based on MBD-DEM," Agriculture, MDPI, vol. 14(11), pages 1-22, November.
    • Handle: RePEc:gam:jagris:v:14:y:2024:i:11:p:2083-:d:1524373
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    References listed on IDEAS

    as
    1. Lan Ma & Fangping Xie & Dawei Liu & Xiushan Wang & Zhanfeng Zhang, 2023. "An Application of Artificial Neural Network for Predicting Threshing Performance in a Flexible Threshing Device," Agriculture, MDPI, vol. 13(4), pages 1-15, March.
    2. Jinwu Wang & Fangyu Guo & Yanan Xu & Jianhua Zhu & Ruida Li & Han Tang & Wenqi Zhou & Qi Wang & Xiaobo Sun, 2024. "Analysis of the Interaction Mechanism between Preharvest Threshing Device and Rice at Harvesting Period Based on DEM Simulations and Bench Tests," Agriculture, MDPI, vol. 14(2), pages 1-23, January.
    3. Shuaifeng Xing & Yang Yu & Guangqiao Cao & Jinpeng Hu & Linjun Zhu & Junyu Liu & Qinhao Wu & Qibin Li & Lizhang Xu, 2024. "Design and Parametric Optimization Study of an Eccentric Parallelogram-Type Uprighting Device for Ratoon Rice Stubbles," Agriculture, MDPI, vol. 14(4), pages 1-19, March.
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