毕业论文英文答辩(CRANE)

TheDesignoftheOverallandATypeofDoorFrameof60TonsGantryCranespeaker：xxx TheMainContents thebasisofthepaper theresearchcontents theresearchmethods summaryandoutlook TheBasisofThePaper1.TheDevelopmentofCrane Inrecentyears,theroleoftheliftingtransportationmachineryisbeyondthescopeofauxiliaryequipmentduetothecontinuousdevelopmentofindustrialtechnology.Andthenthismachineryhasbeendirectlyusedintheproductionprocess.Ithasbeenthemainpartsoftheassemblyline. Tendency 2.TheshortageofthedomesticcranesTheperformanceofproductsanddevelopmentabilityisweak;Thelevelofmanufacturingtechnologyislow;Theproductdetectionlevelisnothigh;Thefittingssupplyisinsufficientandthequalityispoor;Theupdateofproducttechnologystandardislagandislackofexecutiveforce. TheResearchContentsTheDesignoftheOverallandATypeofDoorFrameof60TonsGantryCrane.Determiningtheoveralldesign,includingthedoorheight,themaingirdersspan,gatelegtypeandbasicsize,etc.Calculatingthestrengthofcomponentsorstructureofthecrane,thencheckingthestrengthandstability. theresearchmethods1.Thedesignparameters elevatingcapacity Q=60t typeofdoorleg A liftingaltitude H=12m Liftingspeed v=10m/min runningspeedoflittlevehicle Vc=45m/min runningspeedofbigvehicle v=42m/min Classificationgradeofthewholemachine averageA5 Classificationgradeofmechanism M5 structure singleboxesanddoublebeams material Steelstructure 2.TheTypeofLoad TYPE CONTENTS WORKINGCONDITIONS MARGINofSAFETY Ⅰ fatigue,wearandheatload thegeneralworkingconditions 1.5 Ⅱ staticstrength,thestabilityofthelocalmechanismsstabilityandstabilityagainstoverturning themostunfavorableworkingconditions 1.33 Ⅲ theintensityofacertainsafetydeviceagainstthestormblowaway noneworkingstate 1.153．ConfirmingAPreliminarySchemeThedoorframe:typeAlegs,singlebox,doublebeamsstructure.TheheightofmaingirderisH=15m,thespanisL=30m.Thehingetypeoflegsistworigidlegs. 4.DesigntheDimensionsThedeterminationofmaingirdergeometrysize. GeometricFeaturesofGirders Areas:SL=48976mm2 Momentofinertia: Ix= Iy= Sectionmodulus： Wx= Wy= Thedeterminationofcross-sectiongeometrysizeofdoorlegs. GeometricFeaturesofDoorLegs Areas:ST=60576mm2 Momentofinertia: Ix= Iy= Sctionmodulus： Wx= Wy= 4.CaulculateLoad Thetypesofload Thevalueofload Distributedloadofportalframe Thepressureoflittlevehicle’srools Theinertiaforceoflittlevehiclewhilebraking Theinertiaforceofbigvehiclewhilebraking WindLoads Windloads Thevalueofloads Oncargos Onlittlevehicle Onmainbeam Onlegs 5.CaulculatetheInternalForceofGirderTheinternalforcediagramsofgirder Theverticalin-planebendingmomentofgirder TypeofloadThepositionoflittlecar distributedloadofgirder movingload midspan -769 1371 0 2326 cantilever -769 1371 -2601 -1301 TypeofloadThepositionoflittlecar Theinertiaforceoflittlevehiclewhilebraking Compositebendingmoment midspan 168 81 -601 3778 cantilever 168 81 -3202 151 Thehorizontalin-planebendingmomentofgirder loadThepositionoflittlecar Thefunctionof midspan -41 32 cantilever -85 52 6.CheckingtheStrengthofGirderThemaximumvalueofbendingstressis:(1)Whilethelittlevehicleisatthemidspan.(2)WhileatthecantileveSo,theselectedsizemeetsthestrengthdemandofgirder. 7.CaulculatetheInternalForceofDoorLegs.Whilethelittlevehicleislocatedinthethemaingirderacross. Whileatthecantilever. CheckingtheStrengthofDoorLegs.Themaximumvalueofthedoorlegsis:(whilethelittlevehicleislocatedinthemaingirderacross)So,theselectedsizemeetsthestrengthdemandofdoorlegs. SummaryandOutlookThedesignofthemainbeamsanddoorsleghasbeenillustratedindetailinthispaper.Inaccordancewithlimitstresscalculationmethodandallowablestresscalculationmethod,theauthorhascheckedthestrengthofthemainbeamsanddoorsleg.Intheend,theauthorhasdeterminedthefinaldecisionoftheappropriatesizeinthemainbeamanddoorslegflatplane. AnewstageofthedesignofthecraneElectronicComputerTechnologyOptimizationofEngineeringValueEngineeringReliabilityEngineeringCreatingEngineeringMan-machineEngineeringThesenewtechnologiesarepromotingmanyinterdisciplinarydesignmethodswhicharemoreinnovative,higherqualityandhigherefficiency.