| Based on the national "ninth" five years" key project-study on the equipment and techniqueof raising and transplanting seedlings as the kind of factory, combining the no-tillage specialty which can shorten the working period and reduce the intension of dust devil , the key parts of corn no-tillage transplanter has been studied which can improve both the transplanting speed and reliability ,reduce the labour intension of operator ,further more ,the method of automatic controlling whole working course has been applied by using single-chip microcomputer, the bedrock is made for transforming this technique into social productivity. In general, the content which is studied in this paper can be briefly summarized as follows:1 The conic shape of nutrition plug which suit the growing condition of the corn seedling is made certain through contrast study on the root grow character between the corn and vegetable seedling; then the plug size which bulk is smaller and meets the growing condition of com seedling through cultivating the corn seedling. Using this kind of plug can both save the nutrition soil during making plugs and reduce the working intension during cultivating seedlings, raising the plant-endlong rate in transplanting seedlings.2 The decomposing paper tray is used .which can not only solve the plug metabolic problem in cultivating seedlings ,but also avoiding the root bunch between different individuals; in the mean while, the paper tray can be used both in all single household and in the cultivating seedling factory of our country.3 Based on the shape of conic plug , the profile modeling-annulus equipment which can make plug in a line is designed. This equipment can not only solve the plug lining-up problem in mechanizing way when plug seedlings are transplanted, but also can raise the working speed of no-tillage transplanter, and reduce the working intensity of operator. And then, the influencing rule between the key factors to plug queue speed and working reliability of this set is ascertained, and the variety range of these factors is made, and the theoretic analysis correctness is validated by a great deal of experiments, and the key problem of improving the transplanting speed is solved. So the foundation is set for its practical use.4 The acting-straight-sorting and dropping plug set is designed ,which can solve the sorting plugs unclearly because of the difference between individual plug seedlings ,and can raise the punctuality of sorting plug seedlings and the veracity of plug seedling dropping into the lead-plug-seedling-tube, in addition, the working frequency of acting-straight cylinder is calculated by analysis to the movement and strength of the key parts in this system which can accelerate the transplanting rate to 3 plants per second , further more ,a lot of operated experiments indicate that the working reliability of this set can be raised under the condition of the proper seedling transplanting speed .5 The modernizing technical method is applied and MCS-51 is made as controller of no-tillage transplanter to control all of the execute parts of the equipment automatically by single chip microcomputer through watching these key parts by' some transducer. In this system, the working state of this equipment is online show by calculating the number of transplanted plug seedlings; and the broken-down occurrence can be predicted by alarming system during transplanting plug seedlings; at last, anti-jamming system is designed to raise the reliability of this system further by the method of combine the software with hardware together in the condition of achieving all functions in transplanting plug seedlings.
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