Modeling Analysis, Parameter Optimization And Testing Of Multilink Transplanting Mechanism For Pot Seedling Of Vegetable

Transplanting machine can greatly improve efficiency and planting quality, reduce laborintensity and cost of production. In recent years, research of vegetable transplanting machine hascaused agricultural experts and relevant enterprises to attach great importance to this both athome and abroad. Transplanting mechanism is the ultimate mechanism to implant seedling intothe field and one of the core mechanisms of transplanting machine, which directly impact on theestablishment of seedlings and injury rate after transplanting, thus affecting the yield andsurvival rate, so its performance directly affects the operating performance and competitivenessof the entire machine.This paper presents a new type of transplanting mechanism-multilink transplantingmechanism for vegetable seedling transplanting machine, which is based on summarizing andanalyzing advantages and disadvantages of seven-link vegetable seedling transplanting machinedeveloped by Japanese company Iseki. We has authorized national invention patent(201010104378.8).This paper mainly talks about multilink transplanting mechanism forvegetable seedling transplanting machine, whose major research contents are as follows:1. The kinematics equations of the seven-link vegetable seedling transplanting machinedeveloped by Japanese company Iseki are established; VB-based analysis and optimizationsoftware (computer software works authorized registration:2010SR027536) for the mechanismis developed; a satisfactory result is achieved through man-machine dialogue. Problems existingin the mechanism are analyzed.2. A kind of multilink transplanting mechanism is presented, whose kinematics equationsare established. VB-based analysis and optimization software (computer software worksauthorized registration:2011SR013448) for the mechanism is developed; a group of satisfactoryoptimization results are achieved. The multilink transplanting mechanism possesses theadvantages of small planting hole as well as high establishment rate of seedlings compared withthe seven-link vegetable seedling transplanting mechanism.3. Working cycle of transplanting mechanism is analyzed and dynamic model of multilink transplanting mechanism is established. Supplementary dynamic analysis software for themechanism is developed, which is used to analyze the relationship between force and shaft angleof the input axis at the connecting rods of crank, link and rocker. Thus the basic theory formechanism strength analysis as well as its design and dynamic optimization is achieved.4. Design of multilink transplanting mechanism is conducted according to the optimizedparameters, and three-dimensional modeling, virtual assembly and collision detection are alsoconducted.5. Virtual prototype of multilink transplanting mechanism is established; moving trajectory,transplanting point speed as well as forces at a few hinge points of transplanting mechanism isachieved based on virtual prototype test. Rationality of kinematic model and dynamic modelaccuracy as well as structural design is verified through the compare with the results oftheoretical analysis of kinematics and dynamics.6. Test-bed of multilink transplanting mechanism is developed to test kinematics features oftransplanting mechanism, which includes the trajectory and speed testing of transplanting point.The accuracy of theoretical models and the reliability of the actual work are verified throughcombining experimental study and theoretical analysis.