| The transplanter is the key device to reduce the cost of agricultural production,improve work efficiency and raise output. Relative to the semi-automatic transplanting machines, due to its high efficiency and low cost artificially, automatic transplanting machine has become the focus of research institutions. Some foreign countries have successfully developed a fully automatic transplanting machine,which can do the transplanting work well. However, the domestic development of the automatic vegetable pot seedling transplanting machine is still in the initial stage,there exist not high degree of automation, unstable work, less independent property and disconnection of agricultural machinery with agricultural and so on. So it is very valuable to develop and test the whole automatic transplanting machine for vegetable plug seedling. The seedling transplanting device is the most important working part of the transplanting machine. It is closely related to the specific work requirements,design requirements, design targets and working objects. In order to design the suitable seedling device, it is necessary to make a detailed analysis of the above factors, to get the design requirements and finally formulate a scheme to complete the design work.This paper will research and design in the following aspects, and related tests:(1) According to the design requirements, indicators and working conditions,the requirements of the transplanting machine and the platform for the design of the plant were put forward, and the design scheme of the device was put forward on the basis of the first generation device.(2) The design of a kind of reliable, small, reasonable take seedling claw.Analysis several the working methods of the taking seedling claws at home and abroad, pointed out their working principle and weakness, and put forward a new taking seedling claw design scheme to solve their problems. Describ the working principle of the seedling claw in detail, and mathematical model is established to optimize the structure and size of the seedling claw.(3) Design the pick-up device using simulation technology. Relative to the first generation device, the second generation device replaces driving device and optimizes the size of the components. In software Creo, in order to optimize the rotating stability of rotary door frame, a seedling taking trajectory is planned. With the purpose of reducing the contact force between bearing and groove, reasonable structure sizes of taking seedling debice are ultimately determined through simulation method in Creo and Adams.(4) According to the calculation and analysis of the previous section, the seedlings taking device the is established. Driving cylinder model was determined preliminarily by dynamics simulation. The phenomenon of impact is found during the simulation process and the solution is put forward. Through the simulation of rigid flexible coupling system, the type of driving cylinder is determined. The movement characteristics and contact force of the device were simulated and analyzed.(5) A series of experiments were designed, rate under different water content,different varieties, different height of the three cases of 72 points several tray seedling tests were conducted to test the design index and design requirements and it is found that the success rate is above 94.46%. Design experiments to test the effect of the claw. Recording and analysis of the grab force of the claw, the seedlings in the process of taking seedlings, the damage of the ground after taking the seedling and it can be believed that there is almost no phenomenon of hurting seedlings. The experiment was carried out on the plug seedlings of 128 points, and the phenomenon that the claws of the seedlings inserting into the wall of the cave is found, and the reasons were analyzed. |
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