Optimization design and test of rice plug seedling transplanting mechanism of planetary gear train with incomplete eccentric circular gear and non-circular gears

In order to solve the problem of the high-speed mechanized transplanting of rice plug seedlings,the design requirements of transplanting mechanism for rice plug seedlings were analyzed and a kind of rice plug seedling transplanting mechanism of planetary gear train based on the drive with incomplete eccentric circular gear and non-circular gears was designed innovatively.The laboratory kinematics was examined.The working principle of the transplanting mechanism for rice plug seedlings was studied,kinematics analysis of the transplanting mechanism was carried out and its kinematic model was set up.A human-computer interaction optimization method was used to optimize the parameters of the transplanting mechanism.The computer aided analysis and optimization software of the transplanting mechanism based on Visual Basic 6.0 was developed.Through analyzing the influence of design variables on the optimization objectives of the transplanting mechanism,a set of parameters of the transplanting mechanism which meet the requirements of transplanting trajectory and posture for transplanting rice seedlings were obtained by means of human-computer interaction.The structure of the transplanting mechanism was designed according to this set of parameters,and its virtual prototype and physical prototype were set up and manufactured,respectively.The kinematic simulation test and high-speed photography kinematic test of the transplanting mechanism were conducted to obtain its kinematic performances,such as transplanting trajectory and posture.The results of bench test,simulation analysis and theoretical analysis were almost in agreement,which verified the correctness of the theoretical model and design results of the transplanting mechanism,indicating that the optimized transplanting mechanism can satisfy the requirements of transplanting rice seedlings and be applied in the rice plug seedling transplanter.

椭圆—不完全非圆齿轮行星系蔬菜钵苗取苗机构的研究

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Visual Basic 6.0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。

旋转式水稻钵苗移栽机构的机理分析与参数优化

通过分析国内外水稻钵苗移栽机的缺点与不足,根据水稻钵苗移栽机的特征与优点,提出一种以椭圆-不完全非圆齿轮为传动机构的旋转式水稻钵苗移栽机构,使水稻移栽达到高产高效率的移栽水平。首先,在分析该移栽机构工作原理的基础上,建立了椭圆-不完全非圆齿轮机构的运动学模型。然后基于Visual Basic 6.0可视化编程软件,开发了椭圆-不完全非圆齿轮行星轮系水稻钵苗移栽机构的辅助分析与优化软件。最后,通过分析各参数对移栽轨迹的影响,利用人机交互的优化方法,得到了一组较优的符合水稻钵苗移栽要求的结构参数,该研究可为旋转式水稻钵苗移栽机构的设计提供参考。

旋转式水稻钵苗移栽机构动力学分析与试验

针对一种创新设计的椭圆齿轮-不完全非圆齿轮行星系旋转式水稻钵苗移栽机构,运用动态静力学分析方法和动力学方程组序列求解法,建立机构的动力学模型,利用基于VB软件的动力学分析软件,计算得到机构各运动构件受力及运动副约束反力的变化曲线。搭建机构动力学试验台,开展机构空载动力学试验,测试得到机构在130、160、190 r/min 3种不同工作转速下的动力学特性,通过分析得出:移栽臂工作产生的振动是支座X向振动的主要因素,是支座Y向振动的非主要因素。同时验证了机构动力学模型的正确性,为机构的动力学性能优化提供了可靠模型和试验基础。