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本科毕业设计（论文）任务书机械工程学院2009机械设计制造及其自动化（机械电子工程专业学生学号完成期限一、题目名称螺旋收料机设计二、设计论文内容及要求该题目用于天津市利民调料有限责任公司二期工程酱油发酵车间，是我校承担的横向项目，该设备安装在前处理工序黄豆上料系统，用于接收生产过程中的原料大豆。主要技术要求如下1、生产能力20吨、小时2、螺旋直径约300毫米3、螺旋长度约3500毫米4、材质316不锈钢本课题开题报告应在3月20前完成，实习报告应在3月22日前完成，且不少于2500字数；文献翻译译文资料应在3月底完成，译文不少于5000汉字；毕业设计全部文件应在6月10前全部完成，毕业设计篇幅在2万字左右，参考文献不少于15篇，其中外文文献不少于3篇；设计图纸不少于三张0号图纸，其中一张为手绘图，其他要求详见天津科技大学毕业设计工作手册（2010）相关内容。指导教师签名填写日期年月日注本任务书发给学生，毕业设计（论文）完成后装入毕业设计（论文）档案袋。外文资料翻译1DESIGNCONSIDERATIONSANDPERFORMANCEEVALUATIONOFSCREWCONVEYORSBYALANWROBERTSEMERITUSPROFESSORANDDIRECTOR,CENTREFORBULKSOLIDSANDPARTICULATETECHNOLOGIES,THEUNIVERSITYOFNEWCASTLE,AUSTRALIASUMMARYTHISPAPERISCONCERNEDPRIMARILYWITHSCREWCONVEYORSWITHFULLYENCLOSEDTUBULARCASINGSTHETHROUGHPUT,TORQUEANDPOWERARESIGNIFICANTLYINFLUENCEDBYTHEVORTEXMOTIONOFTHEBULKSOLIDBEINGCONVEYEDTHEVORTEXMOTION,TOGETHERWITHTHEDEGREEOFFILL,GOVERNTHEVOLUMETRICEFFICIENCYAND,HENCE,THETHROUGHPUTTHIS,INTURN,INFLUENCESTHETORQUE,POWERANDCONVEYINGEFFICIENCYATHEORYISPRESENTEDTOPREDICTTHEPERFORMANCEOFSCREWCONVEYORSOFANYSPECIFIEDGEOMETRYTHEINFLUENCEOFTHEFLOWPROPERTIESOFTHEBULKMATERIALONTHECONVEYORPERFORMANCEISILLUSTRATED1INTRODUCTIONSCREWCONVEYORSMAYBEGROUPED,BROADLY,INTOTWOCATEGORIES,THEUSHAPEDTROUGHTYPECONVEYORANDTHEFULLYENCLOSEDCONVEYORINCORPORATINGATUBULARCASINGSCREWCONVEYORSWITHUSHAPEDTROUGHTYPECASINGSAREWIDELYUSEDININDUSTRY,THEIROPERATIONBEINGRESTRICTEDTOLOWANGLESOFELEVATION,LOWSPEEDSANDLOWFILLRATIOSTHELOWFILLRATIOSARETOPROTECTTHEHANGERSUPPORTBEARINGSWHENLONGCONVEYINGDISTANCESAREEMPLOYEDSCREWCONVEYORSWITHFULLYENCLOSEDTUBULARTYPECASINGSAREMOREVERSATILETHEYOPERATEOVERAWIDERANGEOFSPEEDSANDANGLESOFELEVATIONUPTOTHEVERTICALTHEYPERFORMWELLATHIGHERFILLRATIOS,WITHTHECONVEYINGACTIONDUETOTHEHELICALSCREWBEINGENHANCEDBYTHERESISTANCETOROTARYORVORTEXMOTIONOFTHEBULKSOLIDBEINGPROVIDEDBYTHETOTALCASINGSURFACETHEIRDISADVANTAGEISTHELIMITATIONINCONVEYINGDISTANCESINCETHEYNEEDTOOPERATEWITHOUTINTERMEDIATESUPPORTBEARINGSTHISPROBLEMMAYBEOVERCOMEWITHSHAFTLESSSCREWSWHICHEMPLOYHELICALFLIGHTSOFHEAVYCROSSSECTIONSUPPORTEDONPLASTIC,WEARRESISTANTLINERSATTACHEDTOTHEINSIDESURFACEOFTHECASING外文资料翻译2THISPAPERFOCUSESPRIMARILYONFULLYENCLOSED,TUBULARCASINGTYPESCREWCONVEYORSOFPARTICULARINTERESTISTHEPERFORMANCEWITHRESPECTTOTHROUGHPUT,TORQUEANDPOWERWHILETHEPAPERDRAWSUPONONEARLIERWORKPERFORMEDDURINGTHEPERIOD1962641,2,ITCONCENTRATESONMORERECENTWORKDEALINGWITHTHEINFLUENCEOFVORTEXMOTIONONTHECONVEYINGACTION3THEEMPHASISISGIVENTOVERTICALANDSTEEPLYINCLINEDCONVEYORS,WITHANOUTLINEBEINGPRESENTEDREGARDINGTHEPREDICTIONOFPERFORMANCEATLOWERANGLESOFELEVATIONDOWNTOTHEHORIZONTALPARTICULARATTENTIONISGIVENTOTHEAPPLICATIONOFTHEMEASUREDFLOWPROPERTIESOFTHEBULKMATERIALBEINGCONVEYEDINTHISREGARDTHESIGNIFICANCEOFSCREWBLADEANDCASINGFRICTIONONTHECONVEYORPERFORMANCEISDISCUSSEDTHEUSEOFTHECORRECTBULKDENSITYOFTHECONVEYEDMATERIALTAKINGACCOUNTOFTHEMOISTUREANDCONSOLIDATIONCONDITIONSISEMPHASIZEDCASESTUDYEXAMPLESAREPRESENTEDINORDERTOILLUSTRATETHEAPPLICATIONOFTHEDESIGNPROCEDURESTOPRACTICALINDUSTRIALAPPLICATIONS2ENCLOSEDSCREWCONVEYORSTHERELEVANTDETAILSOFTHEENCLOSEDSCREWORAUGERCONVEYORARESHOWNINFIGURE1THEPOWERDRIVENSCREWFLIGHTISSUPPORTEDINBEARINGSANDREVOLVESINASTATIONARYTUBULARCASINGPRACTICALLIMITATIONSREQUIREALIBERALCLEARANCEBETWEENTHEFLIGHTANDTHECASINGANDTHISHASBEENSHOWNTOBEBENEFICIALRATHERTHANDETRIMENTALTOPERFORMANCETHESCREWFLIGHTISALLOWEDTOPROJECTBEYONDTHECASINGATTHELOWERORINTAKEEND,THISPROJECTIONBEINGREFERREDTOASTHE“CHOKE“THESCREWMUSTBEIMMERSEDINTOTHEFEEDMATERIALATLEASTTOTHELEVELOFTHELOWERENDOFTHECASING,OTHERWISETHECONVEYORWILLNOTELEVATETHEBULKMATERIALFIGURE1ENCLOSEDSCREWORAUGERCONVEYORFIGURE2CONVEYORTHROUGHPUT外文资料翻译321CONVEYORTHROUGHPUTTHETHROUGHPUTOFANENCLOSEDSCREWCONVEYORISINFLUENCEDBYTHEROTATIONALORVORTEXMOTIONOFTHEBULKMATERIALDURINGTRANSPORTATIONANDTHEDEGREEOFFILLOR“FULLNESS“OFTHESCREWASTHEROTATIONALSPEEDOFTHECONVEYORINCREASES,THEROTATIONALORVORTEXMOTIONDECREASESUPTOALIMITINGVALUE,MAKINGFORAMOREEFFICIENTCONVEYINGACTIONHOWEVER,WHENAGRAVITYFEEDSYSTEMINTOTHESCREWINTAKEISEMPLOYED,THEFEEDRATECANNOTMATCHTHEPOTENTIALCONVEYINGCAPACITY,ANDAREDUCTIONINFILLRATIOOR“FULLNESS“OCCURSTHENETRESULTISFORTHETHROUGHPUTOFTHESCREWCONVEYORTOREACHALIMITINGVALUEASILLUSTRATEDINFIGURE2BYEMPLOYINGAPOSITIVEFEEDSYSTEMTOINCREASETHE“FULLNESS“,THEEFFICIENCYOFTHECONVEYORCANBEIMPROVEDTHEVOLUMETRICTHROUGHPUTOFASCREWCONVEYORISGIVENBYQQTVM/S1QTD23DTPCS218QTMAXIMUMTHEORETICALVOLUMETRICTHROUGHPUTWITHCONVEYORRUNNING100FULLANDTHEBULKMATERIALMOVINGAXIALLYWITHOUTROTATIONVVOLUMETRICEFFICIENCYDSCREWDIAMETERMDCCOREORSHAFTDIAMETERMPPITCHMANGULARVELOCITYOFSCREWR/SCRADIALCLEARANCEMTSTHICKNESSOFSCREWBLADEMTHEVOLUMETRICEFFICIENCYOFASCREWCONVEYORISTHEPRODUCTOFTWOCOMPONENTSASINDICATEDVVRF4WHEREVRCONVEYINGORVORTEXEFFICIENCYACCOUNTINGFORTHEROTATIONALORVORTEXMOTIONFFULLNESSEFFICIENCY5PHAVHAVAVERAGEHEIGHTOFMATERIALONTHESCREWSURFACESEEFIGURE422EFFECTOFCONVEYORDIAMETERCORRESPONDINGSPEEDSCORRESPONDINGSPEEDSAREGIVENBYNONDIMENSIONALSPECIFICSPEEDNUMBERNSDEFINEDBY外文资料翻译4NS6GWR01789NDWHERER0OUTERRADIUSGGRAVITATIONALACCELERATIONNROTATIONALSPEEDREV/MINITFOLL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TSELFTOAVOIDBLOCKAGESINTHESCREWINTAKE,ITISESSENTIALTHATTHECONVEYORSPEEDISHIGHENOUGHFORTHEFILLRATIOF1FIGURE6FORCEDFEEDINGFIGURE7PLANVIEWOFFEEDERCONSIDERATHREEVANEFEEDEROFTHETYPESHOWNINFIGURE6APLANVIEWISILLUSTRATEDINFIGURE7THEFEEDRATEMAYBEESTIMATEDASQMT/H18FEBENNDD60WHEREBULKDENSITY,T/MBWIDTHOFEFFECTIVEFEEDEROPENING,MDDEPTHOFEFFECTIVEFEEDEROPENING,MDEEFFECTIVEDIAMETEROFFEEDER,MNFFEEDERSPEEDNBNUMBEROFBLADES3FEFEEDINGEFFICIENCY5INFLUENCEOFSCREWANDCASINGFRICTIONTHEPERFORMANCEOFSCREWCONVEYORSISSIGNIFICANTLYINFLUENCEDBYTHEFRICTIONGENERATEDBETWEENTHEBULKMATERIALANDTHESCREWANDCASINGSURFACESASANILLUSTRATION,FIGURES8AND9COMPARETHECONVEYINGEFFICIENCIESVRFORAVERTICALSCREWCONVEYORFORARANGEOFFRICTIONANGLESSANDCFORTHESCREWSURFACEANDCASING外文资料翻译9SURFACERESPECTIVELYTHECONVEYORFILLRATIOISARBITRARILYCHOSENASF80THISMEANSTHATTHEVOLUMETRICEFFICIENCYWILLBEV08VRFIGURE8CONVEYINGEFFICIENCYEFFECTOFSCREWSURFACEFRICTIONFIGURE9CONVEYINGEFFICIENCYEFFECTOFCASINGSURFACEFRICTIONFIGURE10FRICTIONANGLESFORAPARTICULARCOALONMILDSTEELSURFACESTHESURFACEFRICTIONANGLESFORCOHESIVEBULKSOLIDSAREFOUNDTODECREASEWITHINCREASEINNORMALPRESSUREASILLUSTRATEDINFIGURE10THEGRAPHSCOMPARETHEFRICTIONANGLESFORAPARTICULARMOISTCOALINCONTACTWITHMILDSTEELWITHDULLFINISHANDWITHMILDSTEELWITHPOLISHEDFINISHTHEREDUCTIONINFRICTIONWITHINCREASEINTHEPOLISHEDFINISHISCLEARLYEVIDENT,PARTICULARLYASTHENORMALCONTACTPRESSUREINCREASESFORSCREWCONVEYORSTHEPRESSURESAREUSUALLYLOW,ANDHENCETHEFRICTIONANGLESWILLBEHIGHTHISREQUIRESTHEPRESSURESRELEVANTTOTHECONVEYORTOBEDETERMINEDASDISCUSSEDINSECTION76OPERATIONATVARIOUSANGLESOFELEVATION61SPECIALCASEOFHORIZONTALCONVEYORRESEARCHINDICATESTHATFORHORIZONTALSCREWCONVEYORS,THEANGLE,SHOWNINFIGURE5,ISZEROTHATIS,THEHELIXANGLEOFTHEPATHISINDEPENDENTOFTHESCREWSPEEDANDISGIVENBY90S19外文资料翻译10ASANAPPROXIMATION,THISRELATIONSHIPMAYALSOBEASSUMEDFORSCREWCONVEYORSOPERATINGATLOWANGLESOFELEVATIONUPTOSAY,250THECONVEYINGORVORTEXEFFICIENCYDERIVEDFROMEQUATIONS10AND13ISGIVENBYVRH201ETANSTHESUBSCRIPTHDENOTESHORIZONTALPOSITIONASANEXAMPLE,VVALUESCOMPUTEDUSINGEQUATION14FORASCREWWITHACOREORSHAFTDIAMETERONETHIRDTHESCREWDIAMETERAREPLOTTEDINFIGURE11THEEFFECTOFBOTHPITCHTODIAMETERRATIOASWELLASSCREWFRICTIONISILLUSTRATEDFIGURE11CONVEYINGEFFICIENCYFORHORIZONTALCONVEYORD/DC33362ARBITRARYINCLINATIONANGLETHEANALYSISFOROPERATIONATANYELEVATIONANGLEISMORECOMPLEXFORINCLINATIONANGLESRANGINGFROM30TO90,EQUATION12MAYSTILLBEAPPLIED,BUTINTHEMODIFIEDFORMNS21210COSINTAN1FKCSFKRSEEFEETHEFUNCTIONSF1ANDF2NEEDTOBEDEFINEDONCENSFEHASBEENDETERMINED,THENEQUATION16ISUSEDTODETERMINEVRHENCETHETHROUGHPUTMAYBECALCULATEDANALTERNATIVE,SOMEWHATEMPIRICALAPPROACHSOLUTIONISASFOLLOWSICOMPUTETHECONVEYINGORVORTEXEFFICIENCYVRFORAVERTICALCONVEYORINACCORDANCEWITHSECTIONS32AND33IICOMPUTETHECONVEYINGEFFICIENCYVRHFORAHORIZONTALCONVEYORUSINGEQUATION16INTERPOLATETHECONVEYINGEFFICIENCYFORINCLINATIONANGLEASFOLLOWSVRVRHVRHVRSIN227FORCEANALYSISVERTICALCONVEYORS外文资料翻译11FIGURE12FORCESACTINGONBULKPARTICLEINCONTACTWITHSCREWSURFACETHEFORCESACTINGONPARTICLESINASCREWCONVEYORARESHOWNINFIGURE12THEVELOCITYCOMPONENTSAREALSOSHOWNAPARTICLEATTHEOUTERPERIPHERYINCONTACTWITHTHESTATIONARYCASINGEXERTSAFORCEFNAGAINSTTHECASING,MAINLYASARESULTOFTHECENTRIFUGALPRESSURETHECENTRIFUGALPRESSUREGIVESRISETOTHENORMALPRESSUREPNACTINGATTHECASINGAFRICTIONALDRAGFORCEFDCFNACTSINADIRECTIONOPPOSINGTHEABSOLUTEVELOCITYASINDICATEDINFIGURE12AHERECISTHECOEFFICIENTOFFRICTIONFORTHEBULKSOLIDPARTICLEONTHECASINGSURFACETHEWEIGHTOFBULKMATERIALRETAINEDONEACHPITCHISWRORIPGF23THEAXIALFORCEIS240TANT1RNCFESEERATHECORRECTCHOICEOFSCREWANDCASINGFRICTIONANGLESSANDCRESPECTIVELYDEPENDSONTHEFLOWPROPERTIESWHICHDEPICTTHEFRICTIONANGLESASAFUNCTIONOFPRESSUREASILLUSTRATEDINFIGURE10FORTHISREASON,THEPRESSURESONTHEHELICALBLADEANDCASINGNEEDTOBEDETERMINEDTHEAXIALPRESSUREONTHESCREWBLADEISA250TANT1RNCGPESEEFTHEAVERAGENORMALPRESSUREONTHECASINGISGIVENBYAC26EEIMRWTANT208SCREWTORQUEANDPOWERVERTICALCONVEYOR81SCREWTORQUE,TSPTHESCREWTORQUEPERPITCHDUETOTHEBULKSOLIDONTHEFLIGHTFACEMAYBEDETERMINEDFROMTHEFOLLOWINGEQUATION,TSP27SRFPLEEATAN32外文资料翻译12WHERESFRICTIONANGLEFORBULKSOLIDONSCREWSURFACEREEFFECTIVERADIUSAEEFFECTIVEHELIXANGLELLENGTHOFSCREWCONVEYORPPITCH82SHAFTTORQUE,TSHTHENORMALPRESSUREDUETOTHEBULKSOLIDONTHESHAFTISNKGPF28TORQUEDUETOTHEBULKSOLIDSMOVINGRELATIVETOTHESHAFTISTSH29PLRNI2KACOUNTSFORTHEPRESSUREDISTRIBUTIONAROUNDTHESHAFTITISASSUMEDTHATK0483TOTALSCREWTORQUEANDPOWERTHETOTALTORQUEISTTSPTSHKNMPOWERPKW30DN105WHERENRPMDDRIVEEFFICIENCY9SCREWTORQUEANDPOWERARBITRARYINCLINATIONANGLEINTHISCASETHEAXIALFORCEPERPITCHMAYBECOMPUTEDASFOLLOWSFRAWSINECOS31WHEREWISASDEFINEDBYEQUATION23EEQUIVALENTFRICTIONCOEFFICIENTTOALLOWFORDRAGOFTHECASINGWALLSDURINGMOTIONITISEXPRESSEDBYEC1KF32WHEREKPRESSURERATIO04TO06DEPENDINGONCONSOLIDATIONOFBULKSOLIDTHESCREWTORQUEANDPOWERARETHENCOMPUTEDFOLLOWINGTHEPROCEDURESGIVENINSECTION610CASESTUDYEXAMPLES101PREDICTEDANDMEASUREDPERFORMANCETHEPROCEDURESFORCOMPUTINGTHETHROUGHPUTANDPOWERPRESENTEDINTHISPAPERAREEXAMINEDINRELATIONTOTHEPERFORMANCEOFANACTUALSCREWCONVEYORELEVATINGWHEATTHECONVEYOROPERATESINTHEVERTICALPOSITIONANDISGRAVITYFEDTHEPREDICTED外文资料翻译13ANDMEASUREDRESULTSARECOMPAREDINFIGURE13THEAGREEMENTISCONSIDEREDTOBEQUITESATISFACTORYFIGURE13PREDICTEDANDACTUALPERFORMAN