| Transplanting is an important process of vegetable procreating, which has the function ofcompensating varying climate and shifting the procreating of plants to an earlier time. It helpsthe plants to use the source of light and temperature sufficiently, which will make considerableeconomical and social benefits. At present, most transplanting machines are semi-automatictransplanting machines,they need pick up plug seedling by man,which have high workintensity and low work efficiency,and domestic research on automatic transplanting machine isjust beginning. Automatic transplanting machine can pick up plug seedling and transplantingplug seedling by themselves,which have low work intensity and high work efficiency. Theoverseas have automatic transplanting machine be applied in production,but the application andresearch on automatic transplanting machine is developing.Thus the pick up plug seedlingmachine is the key issues,which restricted the development of automatic transplanting machineand at same time,which is also restricted the development of the plants of vegetable. So it's apressing requirement to design a new kind of pick up plug seedling machine.This paper concludes the merits and demerits of several kinds of transplanting machinesfrom both domestic and abroad. Based on the achieved research result, a new vegetable plugseedling pick-up mechanism of planetary gear train with ellipse gears and incompletenon-circular gear has been designed. This vegetable plug seedling pick-up can be used asseedling fetching mechanism lonely to realize fetching seedlings automatically. Besides, if themechanism parameters of this mechanism have been optimized properly, the motion of fetchingseedlings and transplanting seedlings can both be realized by this mechanism. This vegetableplug seedling pick-up mechanism has simple structure and reliable performance. The inventivepatent (201110270977.1) and patent for utility model (201120343300.1) is disclosed. The maincontent of this paper is listed as bellow:1. According to the technological characteristics and agricultural requirements, imitate therequirements of trajectory, motion and attitude of manual pick up plug seedling, invent thevegetable plug seedling pick-up mechanism, which can satisfy the special working trajectoryrequirements of fetching and pick up plug seedlings automatically. This new vegetable plugseedling pick-up mechanism has higher working efficiency, steadier transmission and lessvibration than existing mechanism.2. The working principle and structural features of this automatic vegetable plug seedling pick-up mechanism has been discussed and the kinematic mathematical model of thismechanism has been established.3.Based on the established kinematic mathematical model and Visual Basic6.0, develop thekinematic aided analytical and optimal software of this vegetable plug seedling pick-upmechanism (Register Number:2011SR030044). Introduce the human-computer interactiveinterface and functions of this software. By this software, the difficulty of optimization withmultiple kinematic objects of this mechanism can be solved.4. According to the agricultural requirements in our country, put forward the parametricoptimal objects and methods of the vegetable plug seedling pick-up mechanism. Analyze theinfluence of parameter vitiation on kinematic characteristics of this vegetable plug seedlingpick-up mechanism. Take advantage of the developed software, use the optimization method ofhuman-computer interactive, and obtain the structural parameters which can satisfy the workingrequirements of automatic vegetable pot seedling transplanting.5. In accordance with the obtained structural parameters, design the ensemble of thevegetable plug seedling pick-up mechanism; discuss the problems which should be noticed in theprocess of designing. Finally finish the design of parts and the assembly drawing basing onCAXA2007.6. Establish the solid model of all parts of this vegetable plug seedling pick-up mechanism inUG6.0and then carry out the virtual assemble. Use ADAMS to conduct dynamic simulation ofthis mechanism.7. The research of test-bed. Manufacture a prototype of the vegetable plug seedling pick-upmechanism, at same time, design the test-bed. Measure the kinematic characteristics of thismechanism on the test-bed, prove the reliability in engineering application of this noveltransplanting mechanism. |
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