Authors

Abstract

For Chinese cabbage cutting device in the harvesting process, the problem of cutting resistance and low cutting root qualification rate will occur. This paper takes the Chinese cabbage root as the research object, analyses the root-cutting mechanism of Chinese cabbage, and determines that the main factors affecting its cutting effect are the cutter's inclination angle, rotational speed and its working speed. The finite element method is adopted to establish a rigid-flexible coupling model between the cutting device and the cabbage root, and the Response Surface Method (RSM) central composite design method is used to investigate the relationship among the cutter inclination angle, the cutter rotational speed as well as the working speed and Maximum root-cutting reaction force (MRF) of the cabbage and to further obtain the optimal combination of parameters. Field test results show that in the optimal combination of parameters, which means cutter inclination angle of 11o, cutter rotating speed of 216 r/min and working speed of 0.28 m/s, the root cutting effect is perfect. At this time, the root-cutting qualification rate of 92.81% and field productivity of 0.12 hm2/h, meet the requirements of the standard of Chinese cabbage harvesting mechanization. The results of the study can provide reference for optimization of Chinese cabbage harvesting equipment design.

Abstract in Chinese

针对大白菜切割装置在收获过程中存在切割阻力大、切根合格率低的问题。本文以大白菜根部为研究对象，分析大白菜切根机理,确定影响其切割效果的主要因素为割刀倾角、割刀转速和工作速度。利用有限元法建立切割装置与大白菜根部刚柔耦合模型，采用响应面（RSM）中心复合设计方法，探究割刀倾角、割刀转速和工作速度与大白菜最大切根反作用力（MRF）影响关系，并获得最优参数组合。田间试验验证结果表明，在最优参数组合割刀倾角为11o、割刀转速为216r/min和工作速度为0.28m/s时，切根效果较好，此时切根合格率为92.81%，田间生产率为0.12hm2/h，满足大白菜收获机械化标准的要求。研究结果为大白菜收获装备设计优化提供参考。