基于反求工程原理求解旋转式分插机构的研究

发布时间：2018-03-03 00:27

本文选题：水稻插秧机　切入点：非圆齿轮　出处：《浙江理工大学》2011年硕士论文　论文类型：学位论文

【摘要】：我国研究部门和厂家在应用国外先进的插秧机构方面,只是单纯的测绘和仿制,由于旋转式插秧机构是采用非圆齿轮系传动,它的瞬时传动比影响到插秧机构秧针的运动轨迹,所以,采用一般的机械测量方法很难使得测绘出来的插秧机构非圆齿轮参数满足插秧轨迹的农艺要求;另外,单纯的测绘没有办法对测绘出来的非圆齿轮系结构参数进行优化。为此,本文提出了“基于反求工程原理求解非圆齿轮系旋转式插秧机构的方法”。该方法是通过测绘旋转式分插机构中非圆齿轮的齿顶圆数据,使用MATLAB软件提供的内插法函数将测绘得到的齿顶圆离散点拟合成一条光滑曲线作为齿顶圆,再根据齿顶圆与节曲线的函数关系确定被测非圆齿轮的节曲线数据,应用MATLAB软件中曲线拟合工具箱对节曲线数据进行平滑处理,剔除奇异点,建立节曲线的函数表达式,利用黄金分割法优化齿轮的中心距。同时,研究出人机交互图形软件对设计的非圆齿轮行星轮系分插机构的秧针运动轨迹进行动态仿真,模拟实际插秧过程,检查基于测绘和设计得到的非圆齿轮的节曲线形状和分插机构是否满足插秧的农艺和机构运动不干涉的要求,并提出了适合旋转式分插机构的傅立叶和圆与椭圆两种较优的非圆齿轮节曲线,设计了傅立叶和Z形傅立叶、圆与椭圆节曲线三种非圆齿轮系分插机构,并进行了运动学分析和结构参数优化。利用MATLAB动态直观的显示计算结果功能,开发了非圆齿轮齿廓的设计软件,可根据非圆齿轮的节曲线分析模块检查非圆齿轮是否根切或有设计缺陷,分析非圆齿轮节曲线的曲率变化并自动计算齿廓。对圆与椭圆节曲线非圆齿轮系分插机构进行了样机制造,田间试验证明,本文提出的研究方法正确,满足机械插秧的设计要求。
[Abstract]:The research departments and manufacturers of our country only use the foreign advanced seedling transplanting mechanism in the aspect of simple surveying and imitating. Because the rotary seedling transplanting mechanism is driven by non-circular gear system, its instantaneous transmission ratio affects the moving track of the seedling needle of the seedling transplanting mechanism. Therefore, it is difficult to make the non-circular gear parameters of the seedling transplanting mechanism meet the agronomic requirements of transplanting track by using the general mechanical measurement method; in addition, There is no way to optimize the structural parameters of the non-circular gear system by simple surveying and mapping. Based on the principle of reverse engineering, this paper presents a method to solve the rotary seedling transplanting mechanism of non-circular gear system. By using interpolation function provided by MATLAB software, the discrete points of tooth top circle obtained by surveying and mapping are fitted into a smooth curve as tooth top circle, and then, according to the function relationship between tooth top circle and pitch curve, the pitch curve data of non-circular gear are determined according to the function relationship between tooth top circle and pitch curve. The curve fitting toolbox in MATLAB software is used to smooth the section curve data, eliminate the singularity point, establish the function expression of the section curve, and optimize the center distance of gear by golden section method. At the same time, The dynamic simulation of the seedling needle movement of the non-circular gear planetary gear train was developed by using the human-computer interactive graphics software, and the actual transplanting process was simulated. Check that the nodal shape of the non-circular gear based on mapping and design and the splicing mechanism meet the requirements of the agronomic and institutional movement of seedling transplanting for non-interference, Two better non-circular gear pitch curves, Fourier and circle and ellipse, are put forward, and Fourier and Z-shaped Fourier, circular and elliptic nodal curves are designed. Kinematics analysis and structural parameter optimization are carried out. The design software of the tooth profile of non-circular gear is developed by using the function of dynamic and visual display of the calculation result of MATLAB. According to the analysis module of the pitch curve of the non-circular gear, the non-circular gear can be checked whether the non-circular gear has the root cut or the design defect. The curvature change of non-circular gear pitch curve is analyzed and the tooth profile is calculated automatically. A prototype was made of circular and elliptic nodal curve non-circular gear system. Field experiments proved that the research method proposed in this paper is correct and meets the design requirements of mechanical seedling transplanting.
【学位授予单位】：浙江理工大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：S223.9;TH132.41

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