Dynamics Analysis And Experimental Study Of The Key Components Of Small Unmanned Rice Transplanter

Japan invented the riding type unmanned rice transplanter in the1980s. China followed upthis technology in this century, and focused the research on the riding type unmanned ricetransplanter either. But this kind of rice transplanter wasn’t able to enter the market because ofthe market demand of the riding type unmanned rice transplanter was not large as others and itscontrol system including GPS cost too much. This paper focused the development of unmannedrice transplanter on the walking type rice transplanter, using remote control technology, itsdevelopment and equipment cost only￥3,000, and lifting the toil of farmers ’ field work in thespring, the good market prospects. The paper did some theoretical analysis and experimentalresearch on the backward rotary separating-planting mechanism with eccentric gears andnon-circular gears which was the core part of the riding type unmanned rice transplanter. At thesame time, the paper also did some field test and analysis to the180°steering problem on theedge of the farm which met in preliminary study.This article reads as follows:1)The international general transplanting mechanism on walking type rice transplanter iscrank-rocker mechanism. The backward rotary separating-planting mechanism with eccentricgears and non-circular gears is a new generation of separating-planting mechanism which isinvented by my tutor. It had applied for international invention patent and developed with fourenterprises. The paper was fit for the small unmanned rice transplanter.The paper established thedynamic model of the separating-planting mechanism. According to the model, one softwarewas programmed with VB6.0and Matlab. The software was used to make dynamic analysis ofthe separating-planting mechanism, which the results proved that it could work steadily and befit for small unmanned rice transplanter.2) The virtual prototype of the separating-planting mechanism with eccentric gears andnon-circular gears was established based on UG and ADAMS. The force to separating seedlingswas added to the virtual prototype and the simulation and analysis was carried on. Compared with the results got from theory calculation, it proved that the correctness of the theory model, atthe same time, it could prove that the separating-planting mechanism could work steadily.3) In order to further prove the property, one vibration test was carried on the handle of therice transplanter between crank-rocker transplanting mechanism and backward rotarytransplanting mechanism with eccentric gears and non-circular gears; the test results showed thatthe vibration force on the backward rotary transplanting mechanism can be smaller than that onthe crank rocker transplanting mechanism at a proportion of50%, which is more fit the workdemand and character of small unmanned rice transplanter.4) In order to solve the turning problem of the unmanned rice transplanter, a series of fieldtest were carried on, the test results showed that:a. Moving straight in the paddy field and soft field, driving force increases with the area ofthe impeller; Comparing paddy field with soft field condition, the driving force of movingstraight is2.75times larger in condition of the same area of the impeller. This shows that theeffect of increasing driving force in paddy field is more obvious than that in soft field.b. Moving straight in hard road, the relation between driving force and the area of impelleris nonlinear;c. Turning in the paddy field and soft field, the relation between driving force and the areaof impeller is nonlinear; Comparing turning condition with moving straight condition, thedriving force of turning condition is much larger in condition of the same area of the impeller.Turning on hard road, the driving force increases with the area of the impeller. The growth ofdriving force is not obvious when the area of the impeller reaches to1.4times.The test shows that, the area of the impeller affects the driving force greatly; Comparing thepaddy field condition with other conditions, the driving force in paddy field is much larger thanothers with the same area of the impeller, but the growth of the impeller is limited by other parts’geometry size of the machine.1.5times area of the impeller is fit for small unmanned ricetransplanter through the analysis of the data of the test and the geometry size of other parts of themachine.