| Transplanting is a common approach of the current crop production technology. The breaking soil way for up-film transplanting machine must be punching type accordingly. During the process of transplanting operation, The punching type transplanting machine is, however, discontinuous with regard to the operation of seedling dropping into the soil through transplanting mechanism. So the membrane transplanting machine transplanting efficiency is generally low. The reason of existing up-film transplanting machine can not be able to high-speed transplanting lies in two aspects, On the one hand is due to penetrating and unearthed trajectory is not coincidence, so the planting quality is not high when high-speed transplanting operation; On the other hand trajectory height is too high, resulting in seedling time is too long.This paper researches on the planting trajectory for membrane transplanting mechanism. Paper main work is as follows:（1）First, study the working principle of transplanting mechanism at home and abroad. This paper respectively analyses the various up-film planting trajectory characteristics of transplanting mechanism, Through the comparative analysis to select multilink type transplanting mechanism as the research object.（2）The ideal trajectory of up-film transplanting mechanism in the process of transplanting was analyzed theoretically. Then the theoretical basis for evaluating the trajectories of transplanting mechanism was provided. The trajectory equation of key points of transplanting mechanism was set up. The equations of motion are established in MATLAB, to prepare for subsequent trajectory contrast.（3）ADAMS kinematics model of up-film multilink transplanting mechanism was established, During the comparison analysis process, by changing the structural parameters of the transplanting mechanism, the influence of structural parameters on trajectory of transplanting mechanism was analyzed and the main structural parameters that affect the working quality of transplanting mechanism were thus found. Studied the effect of the transmission ratio on transplanting trajectory. And the change of transmission ratio mainly affects plant spacing and punching size in the process of transplanting that plant spacing increases with the increase of transmission ratio, and has no significant effect on other parameters.(4) Select plant trajectory of key point as evaluation index, Select the length of the crank AB, the length of the crank CD, the phase difference of crank AB and crank CD and duck mouth Angle as the research factors carried out orthogonal experiment. The optimal parameters of membrane transplanting mechanism is as follows: L1=30mm、L2=184mm、L3=34mm、L4=110mm、L5=13mm、L6=146mm L7=71mm、L8=64mm、L9=240mm、L10=255mm;Φ=70°、Φ3=229°、β=86°=93、γ=93°ω=πrad/s、vx=500mm/s、A、C、L initial coordinate, respectively(160.3,133.4),(61.9,-33.),(0,0).(5) Explicit dynamic analysis was carried out for the process of duckbill punching into soil. The finite element model of transplanting duckbill was established.*MAT FHWA SOIL soil constitutive model was constructed. The stress and strain in the process of transplanting was studied.(6) Based on the above research work out test prototype. The transplanting mechanism work under the three gears pulling speed of a tractor. Prototype experiment results showed that the qualification rate of plant spacing was100%, the qualification rate of perpendicularity was93.3%, and the bare rate was3.3%, transplanting efficiency was66strains/min. From the results obtained in this experiment, it can be concluded that:the transplanting mechanism can improve the efficiency of up-film transplanting effectively, and meet production requirements excellently. |
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