Optimization Design And Simulation Analysis For Separating-planting Mechanism Of Female Parent Of Hybrid Rice Transplanter

With the continuous advancement of China’s agricultural modernization, hybrid ricewhich is mechanically transplanted has been done some experiments and studies, however,female parent narrow spacing planting requires quite lager labor intensity as well as thelaborers have been huge loss and other problems, which have become the obstruction ofexpanding the hybrid rice production and reducing the cost of female parent transplanting.The researches show that the spacing requirement of female parent of hybrid rice is between160～170mm in Jianghuai region of our country, while at present, the most of thetransplanters spacing are300mm and240mm, even if at present, our experts have developedfor female parent of hybrid rice transplanter which the spacing is also200mm. Therefore, inorder to reduce the labor cost and improve the labor efficiency, it is urgently needed to study akind of female parent of hybrid rice transplanter used in Jianghuai region. The paper mainlystudies the key component----separating-planting mechanism of female parent of hybrid ricetransplanter, including establishing the mathematical model, optimization design, kinematicalsimulation and finite element analysis, specific content as follows:(1) This article firstly introduces the overall design scheme of rice transplanter for thefemale parent of hybrid rice, expounds the model selection and operating principle of theseparating-planting mechanism of female parent of hybrid rice transplanter, and establishesthe mathematical model of the separating-planting mechanism whose type is crank rocker aswell as the seedling-pushing device;(2) Based on the agronomic requirements in the female parent transplanting of hybridrice, the paper intensively studies the motion trail of the seedling needle, and then obtains theparameters which affect the planting trajectory as the design variable, taking the sum ofsquares of difference minimization between the theoretical motion trail and actual motion trailas the objective function, and various key agronomic requirements as the constraint conditions,using MATLAB software to solve the optimal operating parameters;(3) According to the optimal operating parameters, the three-dimensional model oftransplanting mechanism will be established by the Pro/E software, which then imported intoADAMS software for rigid body dynamics simulation, finally, it will get the result ofkinematic displacement, velocity, acceleration and contact force and other motion parametersof the separating-planting mechanism;(4) The article will set up flexile body between seedling needle and shifting fork, andunite the other rigid parts of the separating-planting mechanism to realize the co-simulation ofrigid-flexible coupling through ADAMS software, which will achieve the result of kinematic displacement, velocity, acceleration and contact force and other motion parameters of theseparating-planting mechanism; Compared with the result get by the rigid body dynamicssimulation, the model of rigid-flexible coupling will be proved reasonably;(5) To check the intension of the wearing parts which is inclues seedling needle andshifting fork by using the finite element analysis software ANSYS, then through choose thereasonable material to ensure its has a longer working life.