## Journal of Central South University

 第47卷    第2期    总第258期    2016年2月

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(1. 吉林大学机械科学与工程学院，吉林长春，130022；
2. 吉林大学生物与农业工程学院，吉林长春，130022
)

Parameters matching and optimization of seedling pick-upmechanism with crank-rocker planetary gear train

1. College of Mechanical Science and Engineering, Jilin University, Changchun 130022, China;
2, College of Biological and Agricultural Engineering, Jilin University, Changchun 130022, China

Abstract:In order to fulfill the agronomic demand of rice planting，the transplanting arms with grippers were applied to the planetary rotation mechanism of high-speed rice transplanter, and a new seedling pick-up mechanism with crank-rocker planetary gear train was designed. The structural features and working principle of seedling pick-up mechanism with crank-rocker planetary gear train was discussed, and the mathematical model of the seedling pick-up mechanism was established. The static trajectory of seedling pick-up mechanism was analyzed and optimized through MATLAB programming, four main parameters influencing the trajectory characteristics of seedling pick-up arms were optimized by choosing different numbers, and a series of optimal structural parameters fulfilling the agronomic demand of rice planting were obtained. The initial position angle of seedling pick-up mechanism (a5) was -6.05e-2(°), the radius of the planet wheel (R) was 78 mm, the length of seedling pick-up arms (lc) was 112.51mm, and the initial position angle of seedling pick-up arms (a6) was 22.73e-2(°). The virtual model of the proposed seedling pick-up mechanism was built with the optimization result, The theoretical analysis was verified by RecurDyn dynamic simulation and prototype test. The results show that the kinematical properties of the seedling pick-up mechanism are better.

Key words: high-speed transplanter; parameter matching; seedling pick-up mechanism; trajectory optimization

 中南大学学报（自然科学版） ISSN 1672-7207 CN 43-1426/NZDXZAC 中南大学学报（英文版） ISSN 2095-2899 CN 43-1516/TBJCSTFT