CAJ | 학술논문

钵苗移栽可以提高产量，对中国粮食安全具有重要意义。在分析水稻钵苗移栽机构最新研究进展的基础上，该文作者发明了基于三次非均匀有理B样条曲线的非圆齿轮行星轮系钵苗移栽机构。选取非圆齿轮节曲线上的13个型值点来控制和表达非圆齿轮的节曲线形状，通过该移栽机构的运动学分析，在确定优化目标的基础上，建立了夹秧片姿态和尖点轨迹的目标函数，将目标函数转化为优化数学模型。利用MATLAB GU平台，开发出该移栽机构的计算机辅助分析与优化软件，通过人机对话调整型值点，优化夹秧片姿态和尖点轨迹，从而获得了一组满足水稻钵苗移栽要求的结构参数。建立三维模型，并利用Admas进行虚拟样机仿真，验证了该移栽机构数学模型的正确性。
발묘이재가이제고산량，대중국양식안전구유중요의의。재분석수도발묘이재궤구최신연구진전적기출상，해문작자발명료기우삼차비균균유리B양조곡선적비원치륜행성륜계발묘이재궤구。선취비원치륜절곡선상적13개형치점래공제화표체비원치륜적절곡선형상，통과해이재궤구적운동학분석，재학정우화목표적기출상，건립료협앙편자태화첨점궤적적목표함수，장목표함수전화위우화수학모형。이용MATLAB GU평태，개발출해이재궤구적계산궤보조분석여우화연건，통과인궤대화조정형치점，우화협앙편자태화첨점궤적，종이획득료일조만족수도발묘이재요구적결구삼수。건립삼유모형，병이용Admas진행허의양궤방진，험증료해이재궤구수학모형적정학성。
The pot seedling transplanting has the advantages of non-hurting root and no need of recovering period, so it can extend the crop growing period, increase and bring forward the effective tillering, which is very important to the food security. Since Japan invented the first transplanter for rice pot seedling in 1975, large agricultural machinery companies have producted their own models in succession, such as Yanmar, Iseki and so on. The materials and manufacture technologies have been improved through the forty years development, but the basic structure and working principle are still the same. All the transplanting machines use 3 sets of mechanism to complete 3 kinds of movements of picking, transporting and planting. The existing machines have the disadvantages of complex structure, high cost and low efficiency. In domestic, the rice pot seedling transplanting machine uses double cranks to complete the 3 kinds of movements, it has relatively simple mechanism, and is suitable for the rice pot seedlings transplanting, but the problems of severe vibration and low efficiency are still existent. According to the above problems, the paper adopted the cubic non-uniform rational B-spline curve theory to fit non-circular gear pitch curve with coincidence of first and last data points as a closed curve. The shape of non-circular gear pitch curve was controlled and expressed through selecting the 13 data points, a new rotary planet gear train mechanism with non-circular gear was developed for rice pot seedling transplants. Through the kinematic analysis of the mechanism, the attitude and sharp point trajectory objective functions of seedling clip were built and transformed into the optimization mathematics model based on optimization of target determined. A computer aided analysis and optimization software of the transplanting mechanism with non-circular planet gear train for rice pot seedling was developed on the MATLAB GUI platform. Through adjusting data points by the man-machine interaction, the attitude and sharp point trajectory of seedling clip were optimized, and a set of structural parameters were obtained to meet the requirements of the rice pot seedling transplants. A three dimensional model was built in software of UG 8.0, and input to software of Admas 2010. The simulation results show that, both track results of theoretical analysis and virtual prototype experiment are fundamentally consistent, so the correctness of the kinematics mathematical model was verified by the virtual experiment. The research can provide a theoretical basis for developing transplanting mechanisms for rice pot seedling.