本文選題：水稻插秧機　切入點：非圓齒輪　出處：《浙江理工大學(xué)》2011年碩士論文　論文類型：學(xué)位論文

【摘要】：我國研究部門和廠家在應(yīng)用國外先進的插秧機構(gòu)方面,只是單純的測繪和仿制,由于旋轉(zhuǎn)式插秧機構(gòu)是采用非圓齒輪系傳動,它的瞬時傳動比影響到插秧機構(gòu)秧針的運動軌跡,所以,采用一般的機械測量方法很難使得測繪出來的插秧機構(gòu)非圓齒輪參數(shù)滿足插秧軌跡的農(nóng)藝要求;另外,單純的測繪沒有辦法對測繪出來的非圓齒輪系結(jié)構(gòu)參數(shù)進行優(yōu)化。為此,本文提出了“基于反求工程原理求解非圓齒輪系旋轉(zhuǎn)式插秧機構(gòu)的方法”。該方法是通過測繪旋轉(zhuǎn)式分插機構(gòu)中非圓齒輪的齒頂圓數(shù)據(jù),使用MATLAB軟件提供的內(nèi)插法函數(shù)將測繪得到的齒頂圓離散點擬合成一條光滑曲線作為齒頂圓,再根據(jù)齒頂圓與節(jié)曲線的函數(shù)關(guān)系確定被測非圓齒輪的節(jié)曲線數(shù)據(jù),應(yīng)用MATLAB軟件中曲線擬合工具箱對節(jié)曲線數(shù)據(jù)進行平滑處理,剔除奇異點,建立節(jié)曲線的函數(shù)表達式,利用黃金分割法優(yōu)化齒輪的中心距。同時,研究出人機交互圖形軟件對設(shè)計的非圓齒輪行星輪系分插機構(gòu)的秧針運動軌跡進行動態(tài)仿真,模擬實際插秧過程,檢查基于測繪和設(shè)計得到的非圓齒輪的節(jié)曲線形狀和分插機構(gòu)是否滿足插秧的農(nóng)藝和機構(gòu)運動不干涉的要求,并提出了適合旋轉(zhuǎn)式分插機構(gòu)的傅立葉和圓與橢圓兩種較優(yōu)的非圓齒輪節(jié)曲線,設(shè)計了傅立葉和Z形傅立葉、圓與橢圓節(jié)曲線三種非圓齒輪系分插機構(gòu),并進行了運動學(xué)分析和結(jié)構(gòu)參數(shù)優(yōu)化。 利用MATLAB動態(tài)直觀的顯示計算結(jié)果功能,開發(fā)了非圓齒輪齒廓的設(shè)計軟件,可根據(jù)非圓齒輪的節(jié)曲線分析模塊檢查非圓齒輪是否根切或有設(shè)計缺陷,分析非圓齒輪節(jié)曲線的曲率變化并自動計算齒廓。 對圓與橢圓節(jié)曲線非圓齒輪系分插機構(gòu)進行了樣機制造,田間試驗證明,本文提出的研究方法正確,滿足機械插秧的設(shè)計要求。
[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.
【學(xué)位授予單位】：浙江理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2011
【分類號】：S223.9;TH132.41

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