椭圆―不完全非圆齿轮行星系蔬菜钵苗取苗机构的研究

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A new type of rotary vegetable plug seedling pick-up mechanism of planetary gear train with ellipse gears and incomplete non-circular gear, which is applied in automatic vegetable transplanting machine, is designed on the basis of analysis of recent advances at home and abroad. Work principle and design requirements are analyzed, structural feature of the mechanism is introduced, then its kinematics model is established. Based on Visual Basic 6.0, computer aided analysis and optimization software for this rotary plug seedlings pick-up mechanism are developed. By human-computer interaction, the structural parameters which meet the demands of picking up seedlings, are optimized. Using these parameters, mechanism 3D model, simulation analysis and prototype test are carried out. Results show that simulation and prototype test accord with theoretical analysis. At the same time, prototype test result shows this pick-up mechanism do well in picking-up, holding and seedling,verifying the correctness and feasibility of the mechanism＇s theoretical model.在分析现有蔬菜钵苗取苗机构的最新进展的基础上,提出一种应用于自动蔬菜移栽机的新型取苗机构――基于椭圆―不完全非圆齿轮传动的行星系蔬菜钵苗取苗机构。分析蔬菜钵苗取苗机构所要求的工作轨迹与设计要求,介绍该取苗机构的工作原理和运动学特性,建立该取苗机构的运动学模型。基于VisualBasic6.0开发出该取苗机构计算机辅助分析与优化软件,通过人机交互方式优化出一组满足蔬菜钵苗取苗机构工作要求的结构参数。根据优化出的结构参数对该取苗机构进行三维建模、虚拟仿真、样机试验,试验发现：仿真结果、样机试验结果与理论分析结果一致;同时,进行该蔬菜取苗机构的取苗试验,该取苗机构能很好地完成取苗、持苗、放苗动作,进一步验证该取苗机构理论建模的正确性和可行性。