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1、本科毕业论文（设计）外文原文题目：小型播种机的设计学院：机电工程学院专业：机械设计制造及其自动化班级：学号：姓名：指导教师：DevelopmentandexperimentofseedmeteringforgrassplotSeederYangSong,ZhangShumin,YiJintao,WengQiang(CollegeofEngineering,ChinaAgriculturalUniversity,Beijing100083，China)Abstract:Inordertodevelopagra
2、ssplotseeder,whichissuitableforcultivationoffinegrassvarieties,aseedmeteringtestplatformwasdevelopedwhichhasaspecialdesignedtransmissionmechanismandaseedcupwithanadjustablering.Severalkindsofseedscanbefedbyfeedingmechanisminfeedingcupwhenseedingshaftaswell
3、asdistributorconerotatesonecompleterevolution.Seedmotionandtherelationshipbetweenseedoutletandseedcupwereanalyzedinthispaper.Resultoforthogonalexperimentshowedthatthenumberofsweeperbladeswasoneofthemaininfluencingfactorsofthevariationcoefficientofseedingun
4、iformity.When12sweeperbladesand9groovesconewereusedintest,thevariationcoefficientofthePacesetter’sseedinguniformitygottotheminimumvalue16.46%.Thisresearchprovidesareferenceforgrassplotseeder’sdevelopment.Keywords:agriculturalmachinery,mechanisms,stressanal
5、ysis,plotseeder,grasscultivationdoi：10.3969/j.issn.1002-6819.2012.z2.013Documentcode:AArticleID:1002-6819(2012)-Supp.2-0072-06CLCnumber:S223.2+60.IntroductionItisimportanttoconductcomparabletestsinexperimentalplotswithbreeding,species,nutritionalvalueandpr
6、oductionresearchforgrassresourceandanimalhusbandry[1].Therefore,plotseederplaysakeyrolefortheresearchandrangelanddevelopment.Thedesignrequirementsofgrassplotseederaresimilarwithconventionalplotseeder,whichneedtofeedauniformamountofseedoverthelengthofaplota
7、ndseedmeteringmustbecleanedbetweencontiguousplotsbecauseseveralspeciesandmixturesmaybeinthesameexperiment.Numerousplotseedershadbeendevelopedforagronomictrialsofseedingbeforeitwasappliedtoseedingrangeland.During1958to1960,EgilØyjorddesignedandimproveda4-ro
8、w,a6-rowanda10-rowplotseeders,respectively.In1970’s,ØyjordplotseederswereexportedfromNorwayto57countries[2].HaroldG.Marshalldesignedaplotdrillwithamultipleoutletconewhichisprovidedwithmultiplestraightgrooves[
