The Principle Analysis And Optimal Design Of Rotary Transplanting Mechanism With Extensile Claw Picking Seedlings

The rice is the main food crop cultivated the most in China,which is the staple food for60%of population of our country,irreplaceable in grain production,and relevant to Food Security.Theperennial cultivated area of rice is about300million hectares,accounting for30%of thecultivated area of grain;The yield of rice is about2billion tons,accounting for40.7%of foodproduction.Due to severe working environment of rice transplanter and complication of workingmechanisms and structure of its core working parts,the level of mechanization of rice productionis low.Super rice proposed by Yuan longping accounts for50%of grain cultivated area,andrequires high-accuracy planting,its mechanization production is nearly blank.So mechanizationof rice cultivation becomes of bottleneck of mechanization of farming.Rice pot seedling transplanting has the advantages of high-accuracy separating seedlings forplanting and so on,and will not harm the root,thought as agriculture cultivation with the hightestyield increasing ratio by rice expert,but transplanting rice by throwing without order influenceventilation and light of rice and marginal advantage,easily leading to plant diseases andpests,standing the way to popularize;and the key technology of pot seedling transplanting isimmature.Transplanting mechanism is Core working parts of rice transplanting machine,and toinvent a transplanting mechanism that works durably and efficiently with simple structure willsolve the problem of research and popularizing of rice pot seedling transplanting machine,to laythe foundation for popularizing rice pot seedling transplanting.In this paper, the new rotary rice transplanting mechanism with extensile claw pickingseedlings is been successful designed with independent intellectual property rights,The researchof this paper includes as followed:(1) On the basis of analysing working mechanisms and kinetic characteristic of existingtransplanting mechanism,aiming at the plastic pots rice pot seedling transplanting adopts to raiserice seedlings,this paper illustrates core technology of rotary transplanting mechanism is howseedling-picking claw accesses pot to pick seedling.Mechanism in this paper break throughtraditional method to pick seedling,proposing stretch out of seedling-picking claw(patentnumber:201110264626.X) to pick seedlings,applying epicyclic train composed by denaturedegg gears in transplanting mechanism first time(patent number:201110264575.0)；the track offront endpoint of seedling claw is like a peach shape with a sharp,which meets the demand forrice pot seedling transplanting.To ensure reliability of picking seedling,in this paper picking seedling by clipping is adopted.This transplanting mechanism has many advantages derived formnon-circular gear meshing,such as drive steady,simple structure, light weight,highefficiency,sligh vibration,low fabrication cost and so on.2) To consider the multiple-target and multiple-parameter characteristics of transplantingmechanism optimizing, the auxiliary analysis and optimization software of transplantingmechanism (software registration number:2011SR074561)has been developed on the VBvisualization development platform.At first, the Kinematic Model of transplanting mechanismmust has been built.With expert experience,the target parameters have been determined,andbecome quantificat,the subjective judgments of user on rationality of the track of this mechanismhas been transformed into comparision of objective value, lowering the difficulty of judgment.(3) Based on the of auxiliary analysis and optimization software, according to thecharacteristics of the optimization of transplanting mechanism,the optimization method ofHumanComputer Interaction has been proposed,employing Separate Analysis and CouplingAnalysis to do the Orthogonal experimental to analyse effect of each parameter on kineticcharacteristic of transplanting mechanism, obtaining the accesee to optimizing fast,pointing outthe direction for optimizing parameters of mechanism,following the optimization methodproposed,the parameters of transplanting mechanism of which the track meets the demand of ricetransplanting has been obtained.(4) According to the characteristic of pitch curve of higherorder denatured ellipse gears,thispaper tests and verifies its Closure and concavity,employing generation method adopting rack togenerate tooth profile.through building the mathematical model of tooth-profile generation,thesoftware to generate tooth profile of higherorder denatured ellipse gears has been developed onthe platform of Matlab,(software registration number:2011SR051232),obtaining the toothprofile of denatured egg gears(second order denatured ellipse gears),giving support to thestructural design and Virtual Manufacturing at later stage.(5) According to the optimizied parameters of mechanism,aiming at structure realizing andmanufacturing of transplanting mechanism,its structure has been designed integrally.whenfunction realized,more attention is paid to reliability design of easily damaged parts, pullingdirection of casting parts, curve fitting of cam and several problems needing to be taked intoaccount in design have been expounded,and the design of each part and assembly drawing iscompleted inCAD.(6) The virtual manufacturing of each part and the virtual assembly of the transplantingmechanism has been done in three-dimensional software UG,exported to the ADAMSmechanical system simulation software for dynamic simulation of the structure.the dynamic simulation result from ADAMS has been compared with the result fromthe optimizationsoftware based on VB,two track are extremely similar, Both of the two methods were used tocross-validate the results.And the result proved the feasibility of rotary transplanting mechanismwith extensile claw picking seedlings adequately.