Optimization Design And Test On Planetary Gears Planting Mechanism Of Self-propelled Transplanting Machine

As one of the core parts of automatic transplanting machine and direct working part that implanted plug seedlings into soil,performance of planting mechanism directly affects planting quality and whole performance of transplanting machine.In this paper,based on previous research of planetary gears planting mechanism of our research group,which only analyzed the planting mechanism performance under different motion parameters.Thus adjustable range of planting distance is limited.In order to solve this problem,studied suitable period vegetable hole tray seedling physical properties,set up kinematics model of duck mouth of the planting mechanism,carried out researches of the planting mechanism motion trajectory,parameter optimization,virtual prototype,cavity forming simulation and prototype field experiment,finally to improve plant performance and enhance its applicability and versatility of planetary gears planting mechanism.In view of above,main contents of this paper are as follows:(1)Studied physical characteristics of suitable period vegetable plug seedlings and measured parameters such as seedling height,diameter,quality of seedling pot and pot body size.Distribution of each parameters of plug seedlings were analyzed statistically,which provided basis for design of duckbill structure and cam structure size.(2)Whole structure and working process of self-propelled automatic transplanting machine were elaborated to clarify working condition for the planting mechanism.Illustrated structure and working principle of planetary gears planting mechanism and designed multi-line synchronous planting scheme of planting mechanism.Derived relations between parameters of plant components theoretically and design parameters of planting parts was determined,as well as three design planting distances of 280 mm,310mm and 345 mm.(3)Set up kinematics model of duck mouth of the planting mechanism and proposed trajectory optimization of the planting mechanism.Designed computeraided optimum design human-computer interaction interface based on MATLAB/GUI platform and specified each module function.Optimized parameters of the planting mechanism through analyzing influence of main parameters on motion curve based on the optimum design interface and a set of parameters that satisfied optimization requirements were selected by human-computer interaction.(4)Designed structure of key parts based on optimized structure parameters and set virtual prototype of the planting mechanism in Pro/E and implemented kinematics simulation in ADAMS.Compared the simulation results of motion trajectories and seedling pot state to theoretical analysis results and verified correctness theoretical analysis of the planting mechanism optimization design.Planting cavity forming process and cavity shape size were studied.(5)Manufactured physical prototype of plant components and assembled to self-propelled transplanting machine to verify the correctness of the theoretical analysis and actual performance of the optimized planting mechanism.Turned out that test results were consistent with the theory,which indicated that the kinematics model and optimization design were correct and feasible and the optimized planting mechanism met the transplanting requirements.