力士樂(lè)M9多路換向閥培訓(xùn)資料

2-loopPositiveControlBlockM9-25HydraulicSystemsatBoschRexrothLUDVNegativeControlPositiveControlThrottle-ControlOpenCentersystemThepumpflowingoingtothetankwhenthemainspoolisinmiddleposition.Withmovingthemainspooltheflowgetsthrottleduntilthepressureraisestotheconsumerlevelandthecylindermoves.Thissystemwasoriginallydesignedforconstantpumps,butisusedtodaywithvariabledisplacementpumpstorunonaconstantpowercurve.LoadSensingSystemHereeachaxishasanindividualpressurecompensatorwhichislocatedbeforethemeter-inorifice.Thehighestconsumerpressureiscalledtothepumpwhichswivelsouttotherequestedflow.Incaseofundersaturationtheconsumerwiththehighestpressurestopsmoving.LoadSensingSystem4.Differentconsumerpressuresarelevelledbythecompensators.5.Theindividualflowtoeachcylinderisinstalledinthemeter-inorificeofthemainspool.6.Whenthedeltapofthecompenatorspringissaturated,thecompensatorclosesandtherearenolossestothetank.FlowSharingSystemThedifferencetoLSsystemsarethecompensators.ThedeltapinLUDVisinstalledinthepumpregulatornotinthecompensators.Thesignalofthecylinderwiththehighestloadissendtoallcompensators.Incaseofundersaturationtheycloseandtheremainingflowwillbeproportionalreducedineachfunction.Noneoftheconsumerstops.RequirementsforControlofExcavator

Goodfinecontrolofconsumers

Simultaneousmovements

Controllability

Lowhydrauliclosses

Efficientuseofpower

Compactdesignofcomponents

Spacesavingandservicefriendlyinstallation

Possibilityofaddingoptions

FastmovementsComparisonofExcavatorControlPrinciplesThreeDifferentSystemsFlowSharingSystems,LUDV

itcanberealiseda1-loopsystemwithaloadindependentcontrol.Itisusedincrawlerexcavatorssmaller20tonandwheeledexcavatorsNegativeControlItisaOpenCentresystemmainlyusedfromJapaneseandKoreancompanies.InneutralthepumpalwayssaturatestheNCorifices.Whenamainspoolgetsmovesoutofcentre,theneutralclosesandthepressureattheNCorificedrops.Thisswivelsoutthepump.ThreeDifferentSystemsPositivecontrolThisisalsoaOpenCentresystem,basedontheNCsystems.ThereisatendencyofJapanesecompaniesmovingtowardsthissystem.ThepilotpressurewhichmovesthemainspoolisalsousedtoswiveloutthepumpTheadvantageisanindependentmanagementofvalveandpump.1-loopSysteminFlowSharingforWheelExcavator1-loopSysteminFlowSharingforCrawlerAdvantagesofLUDVSystemsinExcavatorsSensitiveandloadindependentcontrolofdifferentconsumersConstantfinecontrolatsingleandsimultaneousmovementsDefinedspeedcontrolforeachconsumerbyindividualflowadjustmentTheoperatordoesnothavetothinkaboutchangingleverstrokes,becausetheRexrothLUDV-systeminstantly,silentlyandautomaticallysendjusttherightamountofoiltotheactuators,atjusttherightpressuretoaccommodatethechange.Thefrontendequipmentworksnaturallywiththeoptimumcombinationofspeedandpower.PriorityforoptiononrequestpossibleAdvantagesofLUDVSystemsinExcavators4.FlexibilityforOptions?easytoadoptoneormoreoptionalconsumersasallfunctionsareparallel?PriorityforOptiononRequest5.1-loopSystempossible?onlyonevariabledisplacementpumpneededforallfunctionsLUDVControlBlockM7-ApplicationsNewRexroth1-LoopFlowSharingBlockNew1loopLUDVBlockM7-400

6sectionmonoblock

Spoolsontwolevelsforaverycompactdesign

Sectionflowupto420lpmduetospooldia.32mmforBoomandArm

Mainlyfocusedonel.-hydraulicremotecontrol

Easytoattachoptions,alsowithpriority(MFV)

Newarm-andboomregenerationsystemforfasteractuatorspeedwithoutcavitation

AntidriftvalvesonBoompistonsideandArmrodside

BoomfloatingpossibleComparisonofDesignComparison:LUDV:

Systemwithhighflexibilityforoptions,individualflowadjustmentforconsumer,loadindependent,1-loopSystempossibleNegativeControl:

In2-loopagoodtechnicalandprovensystemPositiveControl:

ImproveddevelopmentbasedonNegativeControl,PumpisnolongercontrolledbybackpressurefromNCorifice,Pumpisswiveledoutbypressuresensorsinpilotlinesandelectronic,Withthis,independentandconsumeradjustedflowcontrolledbythepump.Energysavingsasnolossesinneutral,andnocontrollossesatswivelingoutthepumpBoschRexrothControlsforExcavatorTH6(pilotcontrolunits)OpenCenterGFB+A10FD(slewdrive)A8VO(travelandimplementhydraulics)MX-25GFT+A10FD(traveldrive)PositiveControlpilotpressureDREpilotpressureNewRexroth2-LoopPositiveControl6M9-25NewRexroth2-LoopPositiveControl7M9-25NewGenerationHydraulicvalvefor20to40tonCrawlerExcavatorSystem1.Techn.keydata:?pumpflowQ=2x210...300Ltr./min(2loopsystem),?Pressurep=400/420bar?hydr.orelectr.hydr.Operated2.Increasedmachineproductivityandhighercontrollabilitythroughindependentvalve/pumpmanagement(pumpiscontrolledbylogicinsteadofvalvesignal)3.BaseforfutureElectroHydraulic(EH)Controls(electr.Logicreplacestodayshydrauliclogic)4.Stillsimple,robust,dynamic,flexibleandreadyforthefuture(EH)(advantagesofallcurrentsystemsinonesystem)DescriptionTopoint1:Maxflow300l/mintocoveramachinerangeuptoaround38ton.Topoint2:InNCthepumpiscontrolledbyvalvesignalTopoint3:Eventuallyin2or3stepstotalhydraulicmanagementhydraulicpiloting-Pressuresensorsforpumpmanagementhydraulicpiloting-Pressuresensorsforallpilotsignalstotalel/hydsystemTopoint4:NC:Proportionalpumpmanagement,ManagementoftravelcomparedtoM8(Combinationofparallelandtandemcircuits,Mono-block)7sectionmonoblockdesignDimensions650X420(280)X235mmWeight:~180kg7axismonoblock,subplateforstraighttravelatrearSpooldiameter32mmAllspoolson1layer,Spoolbase70mmPorts:ImplementHydraulicsinfront-P,TandCooleronoppositeside,lesspiping-lessbents-lessΔpOptionsliceseasytoaddonStraighttravelvalveasflangeonhousingOnePumppriorityflowforoptiononrequestAtEHDREsinpilotcoverOptionBoomTrackTrackSlewArmOpenCenterPositiveControl(PC)-2loop

NewControlValve‘sdimensionsof7M9-25-blockNewRexroth2-LoopPositiveControl7M9-25

MorebenefitsIntegratedantidriftvalvesforBoombottomandArmrodside-PortsSAE1?-6000Upto2OptioncanbeflangedonImprovedregenerationfunctionforArminFlowsummationforOptionpossibleRegenerationforboomdownAtsimultaneousmovementstraighttravelandimplementhydraulicthetravellingdoesnotstop(atleast1Pumpfortracks)ImprovedsharingofflowwithcombinedtandemandparallelircuitsSemipriorityofSlewoverArmandBoomoverBucketwithcombinationtandemandrestrictedparallelcircuitBettercontrollabilityofOption1withindividualNeutralCompleteExcavatorSchematicwithaPositiveControlsystem.DescriptionofHydraulicSchematicWeseeacompleteschematicofanexcavatorwithaPositiveControlsystem.VariabledisplacementpumpA8VO..Withintegratedproportionalpressurereliefvalvefortheloadlimitingcontrol.-Block7M9-25-PilotpressureControl-Logicforcontrollingthestraighttravelvalveandrealisingapumpanagement-Proportionalpressurereliefvalvesforthepumpmangement-Hydraulicvalveforstraighttravelvalveandsolenoidvalvetocontroltheprimarytwostagepressurereliefvalve.SlewGearGFB-TravelGearwithmotorandcounterbalancevalvesFurtherconsideredAnelectronicpumpmanagementisusedtoimprovetheperformanceofthesystem.Thereforeweshowpressuresensorsonthelogicblocktotransferthemax.pilotpressureoneachpump(P1andP2onlogicblock)intoanelectricsignalwhichissendthroughamicrocontrollertothepumpandswivelsoutthepumptotherequestedperformance.Inthelogicblockarealsocollectedsignalsseparatelyfromtheimplementhydraulicsandtraveling.Withthissignalsthestraighttravelvalveiscontrolled.3.Theschematicshowstwodifferentversionsofanarmregenerationfunction.Withthefirstprototypewewantanalysiswhichversiongivesabetterperformancetothesystemandthatwillberealisedintheblock.HydraulicLogicfor7M9-25TheportsP1andP2toswiveloutthepump,BBandABtocontrolthesummationfunctions,SBforapressureswitchtoreleasetheelectricbrakeintheslewgear,PIandPTtocontrolthestraightvalveInahydraulicsystemxcanbeusedtochangethepumpflow.Dimension:295x100x100mm(8-Axis)255x100x100mm(7-Axis)HydraulicSchematics

7M9-25Functionsandlocationsintheblock.Mainblock:InthemiddlesummationvalvesforboomandarmandcutvalvesRightandlefttravel,secondarypressurereliefvalvesandcounterbalancevalvesdirectlyontravelmotor.Rightsideslew,secondaryvalvesonslewmotor.S-portforfeedinginsubplateArmwithsecondarypressurereliefvalve,regeneration-meteroutiscontrolledbypumppressure.Anti-driftvalvesBoomwithsecondarypressurereliefvalveregenerationinthespool&anti-driftvalvesBucketwithsecondaryreliefvalvesSubplate:Portsforpump,tankandcoolerPrimaryreliefvalvesStraighttravelvalveNewRexroth2-LoopPositiveControl7M9-25PumpManagement-HydraulicmanagementforMCVandPumpShuttlevalveblockselectsthehighestsignalandpumpswivelsoutaccordingly.Withtheproportionalswivellingofthepumpandtheindividualdesignedspools,thesinglemovementsarealmostloadindependentwhenfinecontrolispassed.Asthereisnosignalsummationforpumpflowinsimultaneousoperation,thepumpmustdeliverrelativelyhigherflowthanactuatordemandsononeactuatoroperation.InsimultaneousoperationpumpdeliverstheflowbyhighestpilotpressureNewRexroth2-LoopPositiveControl7M9-25MeritsofPositiveControlEnergysavingisabigadvantage-NolosseslikeDpinLUDVorfromNCorifice-reducedneutralflowQmin-locationofports(lessbents)-spoolF32-1?“flangeonBoomupandArmin-betterpumpmanagement:reducedareaofneutralnotches->lowtorque-->highflowcontrolEasiermodificationofthecontrollability-SeparatedmanagementofPumpandMCVNewRexroth2-LoopPositiveControl7M9-25NewRexroth2-LoopPositiveControl7M9-25-HydraulicmanagementforMCV;EHmanagementforPumpThehydraulicsignalofthejoystickisgivendirectlytothemaincontrolvalveandthepump.PstsensorsonpilotlinesgivethepilotpressuretothemicrocontrollerwhichcontrolsaDREtoinfluencetheswivellingofthepump.Consumerloadoptimisedswivellingofthepump.Thehighertheloadofaconsumer,themoretheDREinfluencestheswivellingcurveofthepump.2-KreisPositiveControlBlock7M9-25EH7M9-25FlushinginNeutral7M9-25FlushinginNeutralForafasterresponseofthepumpthereisinstalledaQminflow.Instandbyandstartupthisflowisusedforflushingandwarmingupthesystem.DuetothepreloadvalvesforTankandCoolerthereisalsoalwaysmovedoilfromthetanklineoverflushingnotchesinthemainspoolintothepilotcovers,goingtroughthejoysticks(whennotmoved)tothetankThiskeepsthepilotsystemonaconstanttemperatureandeliminatesaviscositydependenceoftheremotecontrol.Inadditioniteliminatesanairbleedingofthepilotcovers.7M9-25StraightTraveling6MX-25StraightTravelingHereweseeastraighttravelingprocess.Aswehavea2-loopsystemeachsinglepumpservesonetrack.Inthestraighttravelvalve,whichstaysinneutralisabypassinstalled,whicheliminatesflowdifferencesinthetwoloops6MX-25StraightTravelplusBucketWhenaddinganadditionalfunction(forexamplebucket)tothetraveling,thestraighttravelshiftsproportionalupto1pumpservingtheadditionalfunctionovertheparallelgalleryandtheotherpumpservingbothtracks.6MX-25SlewingPump1servesslewingPump2doesnotgetasignaltoswivelout.ItstaysatQminandcirculatestheminimumdisplacementflow.6MX-25ArmoutP1goesdirectlyovertheNeutralgallerytotheArm.P2goesovertheNeutralgallerytothesummationspoolandtothearm.6MX-25SlewingandArmoutWhenmovingslewandarm,theflowfromP1goestotheslewandtheNeutralgalleryisclosed.Overaparallelbypasssomeflowstillgoestothearm,arestrictioninthatbypassprevents,thatalloilgoestothearmandtheslewmightstop.P2goesoverthesummationvalvetothearm6MX-25ArminAlsoarminasasinglefunctionisusingbothpumpflows.Thearminregenerationiscontrolledbythemeter-inpressure.Indiggingconditionsthemeter-inpressureopensthetanklineandtherearenopowerlosses.6MX-25Boomup6MX-25Boomup-BucketinBoomupwithBucketAstheNeutralgalleryisclosed,theboomgetsflowovertherestrictedbypass.Wehavethesamesemiprioritylikeslewoverarm.6MX-25Leveling:Boomupfull-ArminfullInstartofleveling,boomandarmareworkingin2loops.Toachieveenoughspeedinthearm,thereisinstalledarestrictedbypasstoincreasethespeedofthearm.Alsotheregenerationofthearmisworkingwhichcanalsoincreasethespeedofthearm.6MX-25Leveling:Boomupfine-ArminfullWhenlevelingcontinues,thespeedofboomupgetslessandthearmgetsadditionalflowoverthesummationvalve.6MX-25Digging:Armin-Bucketin-BoomupIndiggingconditions,wehavethesemipriorityboomoverarmonpump2.Pump1goestotheArm,theregenerationisstoppedduetothehighmeter-inpressure.6MX-25Loading:Boomup-SlewWhenthediggingisfinishedtheexcavatorgoesinaloadingcycle.In2-loopboomupandslewareworking.Tohavemoreflowfortheboomitispossibletosendsomeoiloverarestrictedbypassininfluencewiththisthe50/50ratioofthepumpflow.6MX-25Loading:Boomup-Slew-ArmoutCorrectionInthesamemovementitwillbenecessarytomakecorrectivemovementswiththearmout.Thearmgetsoilthroughthebypassboom-armandtherestrictedbypassslewoverarm.6MX-25

Loading:Boomup-Slew-ArmoutandBucketCorrectionInadditiontherearealsocorrectivemovementsofthebucketnecessary.Thebucketgetsoilovertherestrictedbypassthatdoesnottakepriorityfromboom.6MX-25OptionsConnectionofOptionSpools

StandardOptionparalleltoBoomOptioncanbesuppliedwithbothpumpflowsOptionwithpriorityofonepumpflowpossibleNoCutvalveneededforOptionNewRexroth2-LoopPositiveControl6MX-25Summery:CompactdesignEasierpiping;allactuatorportinfront,pumpandtankattherearNobacktobackdesignwillresultinlessbents,lesspowerlossesAntidriftvalvesonBoompistonsideAntidriftonArminOptionslicesflangemountedImprovedRegenerationforBoomandArmQ1andQ2onOptionpossibleOnrequest;PriorityononepumpforOptionAtsimultaneouslyoperationtrackingandimplementonepumpservestrackingtheotherservesimplement11.Improvedflowsharingduetosuperimposedparallelbypasses?ImprovedSemi-PrioritySlewoverArm?ImprovedSemi-PriorityBoomoverBucket12.BoomloweringwithoutpumponrequestNewRexroth2-LoopPositiveControl6MX-25

MeritsofPositiveControlMeritsofPositiveControlEnergysavingisabigadvantage?duetoreducedneutralflow?betterpumpmanagement

Inreferencetothepilotsystemdifferentpumpmanagementprinciplespossible?Shuttlevalveblockselectingthehighestsignal–Nosignalsummationforpumpflowinsimultaneousoperation,sopumpmustdeliverrelativelyhigherflowthanactuatordemandsononeactuatoroperation.Insimultaneousoperationpumpdeliverstheflowbyhighestpilotpressure?Pilotpressureofeachspoolwillbeconvertedintoanel.signalbypressuresensor.–MicroControllersumsallelectricalsignalsandprop.pressurereducingvalvewillsetpump–Signalsummationforjusttherightpumpflowforallactuatorseveninsimultaneousoperation.NewRexroth2-LoopPositiveControl6MX-25ItisshownahydraulicpilotingwithEL/HYDpumpmanagement,whichcanbethefirststepifnotrealisingatotalhydraulicsystem.Hydraulicpilotcontrollerforexcavator4TH87SDPM07Page584TH6NRand6TH6NR

Features-Hydrauliccontrolfortravel-Cushioningfunctionintegrated

Advantages-Smoothtraveloperation

-SafetyfunctionthrougharmrestpositionNewRexroth2-LoopPositiveControl6MX-25Perspectivefornewgenerationelectro-hydraulicsystemswithPCcontroloncrawlerexcavators(longtermplan)

-Logicforsingleand/orsimultaneousmovements-Modesfordifferentdriversspecificbehaviourofmachine-Workingmodes(HeavydutytoLightmodesoranyother)Curvesofjoystickandpedalscanbeprogrammedindividually-Lessnoiseandnooilinthedriverscabin-ProgrammableAttachmentsSchematicwithElectronicControlTheproportionalpressurereducingvalvesareinstalledinthepilotcoversofthemainblockPressurereducingvalvefamilyDRETHE5ElectronicJoysticksAvailablein3differentranges:4THES5 AnalogSignalrangeTHEC5 CANbusrangeTHE5 PowerrangePWMEasilyadaptedonseveralhandles:EC2000/2000+EC4000CustomerhandlesTechnicalperformances:Tightness:IP65onUpperpartLifetime:3millionscyclesRobustmechanicalconceptionSameergonomicconfigurationthanhydraulicjoysticks4THES5THEC5THE5New4THES5PWMforexcavatorVoltagesupply:8-32VDC.OperatingTemperatureRange:-40Cto+85CStorageTemperatureRange:-40Cto+85CPWMOutputisa500HznominalPWMsignal.PWMOutputhavenominalrangeof0.5VDCto5VDC.Theoutputiscapableofsourcing20mAat4.0VDCandsinking20mAat1.0VDC.PWMoutputresponsetimefromlever/pedalislessthan5msec.Nobreakdownwhenoutputstageorlogicinputsareshortedto32Vorground.GeneratesprecisePWMsignalupto100V/melectromagneticfield.Protectedagainstmoisture,allelectricpartsmeetIP67specification.Supportvibrationstestupto5gfrom20to2000Hz.4THES5PWMforexcavatorElectroniccomponentsarepottedtogaranteehighprotectionagainstdustandwater.Elpilotcontroller4THE5NR4