机械原理 英汉双语 教学课件 作者 张春林 Chapter 11 Design of Mechanism Systems.pptx

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1、Chapter11DesignofMechanismSystems1.SimpleMechanismSystemConsistingofaSingleMechanism11.1IntroductionofMechanismSystemsWhendesigningasimplemechanismsystem,methodsofevolutionandmutationcouldprovideanapproachforcreatingnewmachines.Forexample,Fig11-1ashowsthesketchdiagramofashearingmachine.Thepinofther

2、evolutepairBandthedimensionoftheprismaticpairCareenlargedenoughtoobtainashearingmachineshowedinFig11-1b.Fig.11-1　Shearingmachine(剪床机构)2.ComplexMechanismSystemConsistingofIndependentMechanismsFig.11-2　Motionharmonizationofmechanism(机构运动的协调)Fig.11-2showsahydraulicmechanismsysteminwhichthehydrocylinde

3、r1and2willoperateindependently.Thehydrocylinder1willtransferaworkpiecefromposition1toposition2,thenhydrocylinder2willtransfertheworkpiecetoposition3.Atthistimehydrocylinder1mustgobacktoitsinitialposition.3.ComplexMechanismSystemConsistingofMechanismsConnectedbyEachOtherFig11-3showsacomplexmechanism

4、system,inwhichbeltmechanism,wormmechanism,cammechanism,linkagemechanismareconnectedinseries.Itcouldclipandfeedautomatically.Fig.11-3　Automaticfeedingmachine(自动送料机)1.MotionHarmonizationofaMechanismSystemFig.11-4　Punchingmechanism(压力机机构)11.2HarmonizationDesignofMechanismMotionsFig.11-4showsapunchin

5、gmachineinwhichtheactionoftheslidercrankmechanismABCisusedtopunchandtheslidercrankmechanismFGHisusedtofeed.Whenthepunchingheadgoesupafterfinishingapunchingprocess,thefeedingmechanismstartstofeed.Besides,thefeedingmechanismmustcompletefeedingandreturntoitsinitialposition,andthenthepunchingheadwillbe

6、gintopunch.2.DesignofMotionCirculationDiagramFig.11-5showsthemotioncirculationdiagramofapunchingmechanism.Inthefigure,theabscissaaxisindicatesthemotioncycleoftheactuatorsandtheordinateaxisindicatesthemotionstatusoftheactuators.Everymotionstatusofmechanismscanbeexpressedinthismotioncirculationdiagra

7、m.Fig.11-5　Motioncirculationdiagramofapunchingmachine(压力机机构的运动循环图)3.KeyPointsforDesigningMechanismSystems1)Choosesimplemechanismstosatisfythemechanicalfunctions.2)Sketchupthemotioncirculationdiagram.3)Sy