Design and experiment of a drag-type carrot harvesting device driven by non-circular gears

doi:10.13733/j.jcam.issn.2095-5553.2025.03.002

Abstract

Abstract:

To solve the problem of poor carrot root-stem separation in traditional constant-speed drag-type carrot harvesting devices, this paper proposes a drag-type carrot harvesting device driven by non-circular gears based on the improved motion characteristics of the drag rod. Taking the motion characteristics of the drag rod as the design goal, the mathematical relationship between the drag rod speed curve and the non-circular gear pitch curve is established by using the reverse analysis method. Based on this, a new drag-type carrot root-stem separation mechanism driven by non-circular gears is designed. UG 3D design software is used for 3D modeling and motion simulation, and the results show that the simulated speed curve of drag rod is consistent with the theoretically designed speed curve. A test bench for the non-circular gear-driven drag-type carrot root-stem separation device is developed, and the tests of carrot root-stem separation are conducted. The results show that the success rate of carrot root-stem separation is 97.1%, and the damage rate is 4.9%. Compared with the traditional drag-type carrot root-stem separation device, the non-circular gear-driven device improves the effect of carrot root-stem separation, providing a reference for optimizing the drag-type carrot harvesters.

Key words: carrots, drag-type, harvesting device, reverse design, root-stem separation, motion characteristic

摘要：

针对传统匀速驱动的拉拽式胡萝卜收获装置存在胡萝卜根茎分离效果差等问题，基于拉拽杆改进运动特性，提出非圆齿轮驱动的拉拽式胡萝卜收获装置。以拉拽杆改进运动特性为设计目标，采用逆向分析法建立拉拽杆速度曲线与非圆齿轮节曲线的数学关系式，设计非圆齿轮驱动的新型拉拽式胡萝卜根茎分离机构。运用UG三维设计软件进行三维建模与运动仿真，结果显示拉拽杆仿真速度曲线与理论设计速度曲线吻合。研制非圆齿轮驱动的拉拽式胡萝卜根茎离装置试验台，并进行胡萝卜根茎分离对照试验。结果表明，胡萝卜根茎分离的成功率为97.1%，损伤率为4.9%。相比于传统拉拽式胡萝卜根茎分离装置，非圆齿轮驱动的拉拽式胡萝卜根茎分离装置有助于改善胡萝卜根茎分离效果，可为拉拽式胡萝卜收获机优化提供参考。

关键词: 胡萝卜, 拉拽式, 收获装置, 逆向设计, 根茎分离, 运动特性

CLC Number:

S225.7

Zeng Gongjun, , Chen Jianneng, , Xia Xudong, , He Yeneng. Design and experiment of a drag-type carrot harvesting device driven by non-circular gears[J]. Journal of Chinese Agricultural Mechanization, 2025, 46(3): 6-10.

曾功俊, 陈建能, 夏旭东, 何也能. 非圆齿轮驱动的拉拽式胡萝卜收获装置设计与试验[J]. 中国农机化学报, 2025, 46(3): 6-10.

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