Authors

Abstract

In response to the current low level of mechanized harvesting for heading vegetables in China and the unsatisfactory harvesting results, this study focuses on the root-cutting operation during the harvesting process. A double-disk root-cutting device was designed to achieve low-power consumption and high-efficiency root cutting. Through LS-DYNA simulation experiments, the root-cutting process of the root-cutting device was simulated, and the cutting force and internal cutting energy of three different cutter combinations are compared. The simulation results show that the maximum cutting force of the double-serrated blade was the smallest, while the combination of a smooth blade and a serrated blade had the lowest internal cutting energy. Compared to smooth blades, serrated blades exhibited better clamping effects on the roots of head-forming vegetables. Considering both cutting force and internal cutting energy, the combination of a serrated blade and a smooth blade was found to be optimal. The quadratic rotary orthogonal combination test method was used to analyze the relationship between the main influencing factors of the root cutting device performance (rotational speed of the cutter, conveying speed, inclination angle of the cutter, and overlapping amount of the cutter) and the performance index (root cutting power) of the root cutting device. The bench test program was designed by applying regression analysis, response surface and multi-objective variable optimization methods. The bench test results show that the optimal parameter combination of the designed root cutting device were: cutter speed of 200 rpm, conveying speed of 0.3 m/s, cutter inclination angle of 10°, and cutter overlap of 20 mm. The predicted cutting power of the model was 51.19 W.

Abstract in Chinese

针对现阶段我国结球类蔬菜机械化收获水平低下，收获效果不理想等问题。本文重点研究结球类蔬菜收获过程中的切根作业，设计一种双圆盘切根装置，可实现低功耗、高效率切根。过LS-DYNA仿真实验，模拟了切根装置的切根工作过程并比较了三种切刀组合的切根力和切根内能，仿真实验结果双锯齿刀的最大切根力最小，光刀与锯齿刀的组合切根内能最小。光刀与锯齿刀相比，锯齿刀对结球类蔬菜根的钳持效果更好，综合切根力和切根内能，选择锯齿刀加光刀的组合更优。采用二次旋转正交组合试验方法，分析切根装置性能的主要影响因素（切刀转速、输送速度、切刀倾角、切刀重叠量）与性能指标（切根功率）的关系，应用回归分析、响应曲面和多目标变量优化方法设计了台架试验方案。台架试验结果表明，所设计切根装置的最优参数组合为：切刀转速200rpm，输送速度0.3ms-1，切刀倾角10°，切刀重叠量20mm；模型预测的切根功率为51.19W。