分析现有穴盘苗取苗机构的发展现状，提出一种新型的旋转式穴盘苗取苗机构。依据旋转式穴盘苗取苗机构的结构特点及工作原理，选取三段合适的传动比函数，构建一种新型非圆齿轮的节曲线方程，建立该穴盘苗自动取苗机构的运动学模型。开发该取苗机构的计算机辅助分析软件，通过人机交互方式得出一组满足旋转式穴盘苗取苗机构工作要求的结构参数。基于参数对该取苗机构进行了设计，提出一种能够实现变化范围较大变速传动的新型非圆齿轮。对新型非圆齿轮完成结构设计及试验，验证了新型非圆齿轮的可行性。通过分析虚拟仿真得到的工作轨迹及取苗爪尖点的速度曲线，验证该取苗机构的可行性及工作的平稳性。

A new kind of rotary plug seedling pick-up mechanism is designed on the basis of the analysis of current development situation. Kinematic model is established according to structure characteristic and working principle of plug seedling pick-up mechanism. Pitch curve equation of a new non-circular gear is built on account of three suitable transmissions ratio functions. The software of computer-aided analysis for this rotary plug seedling pick-up mechanism is developed. By human-computer conversation, structural parameters are carried out, which can meet the demand of driving. Based on these parameters, design of rotary plug seedling pick-up mechanism is carried out. A new kind of non-circular gear is put forward, which can get large range variable speed drive. Feasibility of new type of non-circular gear is verified after structure design and test of new non-circular gear is completed. At the same time, feasibility and stability of plug seedling pick-up mechanism are demonstrated on the basis of trajectory of virtual simulation and velocity curve of transplanting claw .