The Research And Design Of Vegetable Plug Seedling Pick-up Mechanism Of Planetary Gear Train With Elliptical Gears

At present, semi-automatic vegetable pot seedling transplanting machine has occupied themain market at home and abroad, but its work efficiency is not high which relied on artificialfeeding seedling. Meanwhile, the rate of seedling leakage increase with the rotating speedaccelerated. But the automatic vegetable pot seedling transplanting machine can provideautomatically send seedling, pick seedling, forest seedling and other attachment function, whichimprove work efficiency significantly. Therefore the research on automatic vegetable potseedling transplanting machine is imminent, whose development is restricted by the pickingseedling mechanism. Due to the existing picking seedling mechanisms’ structures arecomparatively complex, to research and design relatively simple picking seedling mechanismcan not only reduce the automatic vegetable pot seedling transplanting machine’s manufacturingdifficulty, also can expedite its speed of development.After analyzing the advantages and disadvantages of a variety of automatic picking seedlingmechanisms, a new picking seedling mechanism of planetary gear train with five congruentellipse gears put forward, to replace artificial feeding seedling and realize the function ofautomatic pick seedlings. Compared with the existing high-speed picking seedling mechanism inthe domestic and overseas, its simple degree is more outstanding and structure size is smaller. Atthe same time, it has applied for a patent for invention (Application NO.:201210293743.3), andauthorized utility model patent (Patent NO.:201220408962.7). In this paper, the followingaspects are mainly studied:1. The requirements of trajectory and posture when the seedling picked by manpower arestudied, thus a new simple picking seedling mechanism is developed, it can satisfy therequirement of automatic pick seedling’s trajectory and posture.2. The design requirements for picking seedling mechanism are analyzed, suitable hole trayis selected, the principle and characteristics of the mechanism are expounded, the kinematicsmodel is established, the optimization software combined with VB6.0(software registrationnumber:2013SR004989) is exploited.3. On the basis of human-computer interaction, the influence of diverse structural parametersto the trajectory of the mechanism is analyzed, and the optimal parameters’ value is selected.4. Based on the optimal structure value of the software, the ensemble two-dimensional of themechanism is designed in Autocad2011, the design problems of some key parts in the seedlingarm are eliminated, the installation position of the cam is determined.5.3d modeling in UG6.0are established, kinematics simulation in ADAMS2010is conducted, the simulation trajectory compared with VB trajectory to verify its consistency.6. Components manufacturing and assembly are finished, kinematics characteristics test andseedling picking experiment was carried out, to prove the correctness of the theory andpracticability of the mechanism.