Reverse Design, Simulation And Test Of Equal-diameter Cam Seedling-pushing Mechanism

Rice transplanter can effectively reduce the burden of peasants, greatly increase theproduction efficiency, and reduce the pastureland rate of paddy field. Transplanting mechanismis the core working parts on the transplanter, as an important part of transplanting mechanism,seedling-pushing mechanism is used to fetch seedlings from seedling box in transplanter andinsert them into paddy field, the mechanical properties of seedling-pushing mechanism influencethe quality of rice planting directly. For a long time, transplanter experts have lucubrated inseedling-pushing mechanism, based on the advantages and disadvantages of traditionalseedling-pushing mechanism, this paper has come up with a new kind of seedling-pushingmechanism——equal-diameter cam seedling-pushing mechanism.The main contents of this paper are shown as follows:1)Equal-diameter cam seedling-pushing mechanism was presented, on the basis of idealkinematic curves of the seedling-pushing rod, kinematics model of the equal-diameter camseedling-pushing mechanism was established, and reverse mathematical model of equal-diametercam was obtained; auxiliary analysis software of this seedling-pushing mechanism was compiledbased on VB; a set of optimum structural parameters were obtained through parameteroptimization.2)Working cycle of equal-diameter cam seedling-pushing mechanism was analyzed, anddynamic model of the seedling-pushing mechanism was established; dynamic analysis softwareof the seedling-pushing mechanism was compiled, force analysis of key parts such asseedling-pushing rod、transmission fork、roller rod、equal-diameter cam in the seedling-pushingmechanism were conducted by this software, the relationships of force and planet carrier anglewere obtained.3)According to optimized structural parameters, structural design of equal-diameter camseedling-pushing mechanism was accomplished, and three-dimensional modeling, virtual assembly and interference checking of the seedling-pushing mechanism were also accomplished.4)Virtual prototype of equal-diameter cam seedling-pushing mechanism was established;trajectories of seedling needle and seedling-pushing rod were tested based on the virtualprototype; validity of kinematics model and dynamics model of the equal-diameter camseedling-pushing mechanism as well as the structural design were verified by comparing to thetheoretical analysis results.5)Experimental prototype of equal-diameter cam seedling-pushing mechanism wasdeveloped, the actual kinematics charcteristics were tested and compared with theoretical results,the correctness of the theoretical model was verified through the comparing.