中文摘要：

为满足液态施肥机转子式转换器空间凸轮机构运转平稳、防止液肥泄漏与施肥量精准的性能要求，建立了空间凸轮数学模型。应用VisualBasic6．0开发空间凸轮优化软件，得到凸轮的平均圆柱半径为37mm以及轮廓曲线图，应用Pro／E软件对空间凸轮机构进行三维建模与运动学仿真，验证了该空间凸轮机构设计的合理性。进行试验台试验，当液压泵压力0．4MPa、输出轴转速69．75r／min时，所测施肥量基本相同，且喷肥针只在空间凸轮的推程到回程阶段喷肥。结果表明：空间凸轮机构运转平稳，符合设计要求。

英文摘要：

In order to satisfy the performance requirements of spatial cam mechanism in rotary converter of liquid fertilizer applicator, such as stable working and precise liquid fertilization, a mathematical model of spatial cam was established. The software for optimizing the spatial cam was developed by using Visual Basic 6. 0. The average radius of cylinder was got as 37 mm and curve profile of spatial cam was obtained. Three-dimensional model and kinematics simulation of spatial cam mechanism were established by using Pro/E software, which verified the design reasonability of spatial cam mechanism. Finally, the mechanism was tested on the test-bed. The result showed that when the pump pressure is 0.4 MPa and the output shaft speed is 69.75 r/min, the fertilizer consumptions are almost the same at different measurement time, and the picking hole mechanism only sprays liquid fertilizer on the rise to fall travel process of converter＇s spatial cam. The results show that the proposed spatial cam mechanism could work smoothly that meets the design requirements of spatial cam.