液压与气压传动英汉双语 教学课件 作者 陈淑梅第1章Chapter_1.ppt

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1、Chapter1IntroductiontoHydraulicandPneumaticTransmission1.1StudyonHydraulicandPneumaticTransmission1.2OperatingPrinciplesofHydraulicsTransmission1.3ComposingofHydraulicTransmissionSystem1.4FeaturesofHydraulicandPneumaticTransmission1.5TheDevelopmentHistoryandApplicationsofHydraulica

2、ndPneumaticTechnologymedium：Fuidmediumenergyofcompressivefluid(pressureoilorcompressiveair)mediumcontrolmeansthecontents1.1StudyonHydraulicandPneumaticTransmissioncontrolmeans：Hydraulicandpneumatictransmissionsaresimilarinoperatingprincipleandcontrolmeans.Specialsub-circuitsbuiltby

3、varioushydraulic(orpneumatic)componentsareusedtobuildupparticularhydraulic/pneumatictransmissionsystemstorealizeenergytransferandcontrol.contents：(1)Physicalperformancesandstatic/dynamiccharactersoffluid.(2)Operatingprincipleandconstructseveralhydraulicelementsandsub-circuitand(3)H

4、ydraulic/pneumaticsystemdesignsarethebestwaytostudypower(hydraulic/pneumatic)transmissionandcontroltechnology.1.2OperatingPrinciplesofHydraulicsTransmissionPascal’slaw：pressureexertedonaconfinedliquidistransmittedundiminishedinalldirectionsandactswithequalforceonallequalareas.Fig.1

5、-1Operatingprincipleofhydraulicjack（1-2）（1-1）1.PowertransmissionThusthemovingpistoncandoworkonanoutsideload.Wecangetthefirstimportantlawherethattheworkingpressuresinthehydraulicsystemdependedontheoutsideload.thehydraulicpressureintheactuatorp2：thethrustonthesmallpistonofpumpF1:（1-4

6、）wecangetthesecondimportantlawherethatthemotionspeedofpistoninactuatordependsontheinletflowrate,andindependentoftheoutsideload.hydraulicoilpressureandtheflowratearethetwomainparametersinthehydraulicsystem.2.MotiontransferThevolumeofdisplacementisequaltothevolumedrawnintoit,andthen：

7、（1-3）Dividingbythemovingtimetonthetwosidesintheaboveformula,wehave:q1=v1A1=v2A2=q21.3ComposingofHydraulicTransmissionSystemFig.1-2Principleofatypicalhydraulicsystem1-Hydraulicpump2-Adjustablethrottlevalve3-Closedcenterdirectionalvalve4-Hydrauliccylinder5-Workingload6-Reliefvalve7-F

8、ilter8-ReservoirFromanoper