Reverse engineering design of automatic seedling taking mechanism of non-circular gear planetary gear train

Non-circular planetary gear train mechanism has been widely studied and applied in rice transplanting mechanism because it can realize unequal speed transmission and form a special non-circular closed track at the end of the output component. In recent years, scholars began to study the use of non-circular gear planetary gear train mechanism to design hole disk seedling taking mechanism and seedling planting mechanism. Because the hole disk seedling taking mechanism needs seedling taking components to realize complex trajectory and attitude, the design of transmission parameters of non-circular gear planetary gear train is difficult, and the effect of mechanism seedling taking needs to be further improved.

The research methods of non-circular gear planetary gear train mechanism mainly include forward optimization design and reverse engineering design. The forward design method is intuitive and easy to model, but the forward design can not clarify the trajectory type that can be realized by this kind of transmission; Although the reverse engineering solution of the mechanism can formulate the expected trajectory according to the working requirements, B-spline fitting is a common curve calculation method. The transmission ratio of non-circular gear calculated according to the trajectory in reverse engineering design may fluctuate abnormally, resulting in more concave convex changes or large curvature fluctuations in the pitch curve, resulting in the failure of tooth profile design and practical application.

Seedling picking mechanism is the key component of vegetable transplanter. In recent years, Zhejiang University of technology has carried out a lot of theoretical and Experimental Research on the intermittent transmission seedling taking mechanism of non-circular gear planetary gear train, and developed a variety of vegetable bowl seedling taking mechanisms. If the continuous non-circular gear planetary gear train mechanism can be used to realize the function similar to the intermittent transmission seedling taking mechanism, the mechanical performance of the mechanism can be improved, which provides favorable conditions for improving the machine speed and increasing the seedling taking efficiency.

Therefore, the reverse engineering design of non-circular gear planetary gear train transmission mechanism facing the requirements of automatic seedling taking trajectory and attitude of cavity plate seedlings is carried out, in order to obtain the judgment criterion of reproducible trajectory and reasonable planning method of trajectory, provide a better choice for seedling taking mechanism, and also provide reference for similar mechanism design problems.

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