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ID:58824689
大小:6.42 MB
页数:79页
时间:2020-10-01
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1、2-loopPositiveControlBlockM9-25HydraulicSystemsatBoschRexrothLUDVNegativeControlPositiveControlThrottle-ControlOpenCentersystemThepumpflowingoingtothetankwhenthemainspoolisinmiddleposition.Withmovingthemainspooltheflowgetsthrottleduntilthepressureraisestotheconsumerlevelandthec
2、ylindermoves.Thissystemwasoriginallydesignedforconstantpumps,butisusedtodaywithvariabledisplacementpumpstorunonaconstantpowercurve.LoadSensingSystemHereeachaxishasanindividualpressurecompensatorwhichislocatedbeforethemeter-inorifice.Thehighestconsumerpressureiscalledtothepumpwh
3、ichswivelsouttotherequestedflow.Incaseofundersaturationtheconsumerwiththehighestpressurestopsmoving.LoadSensingSystem4.Differentconsumerpressuresarelevelledbythecompensators.5.Theindividualflowtoeachcylinderisinstalledinthemeter-inorificeofthemainspool.6.Whenthedeltapofthecompe
4、natorspringissaturated,thecompensatorclosesandtherearenolossestothetank.FlowSharingSystemThedifferencetoLSsystemsarethecompensators.ThedeltapinLUDVisinstalledinthepumpregulatornotinthecompensators.Thesignalofthecylinderwiththehighestloadissendtoallcompensators.Incaseofundersatu
5、rationtheycloseandtheremainingflowwillbeproportionalreducedineachfunction.Noneoftheconsumerstops.RequirementsforControlofExcavatorGoodfinecontrolofconsumersSimultaneousmovementsControllabilityLowhydrauliclossesEfficientuseofpowerCompactdesignofcomponentsSpacesavingandservicefri
6、endlyinstallationPossibilityofaddingoptionsFastmovementsComparisonofExcavatorControlPrinciplesThreeDifferentSystemsFlowSharingSystems,LUDVitcanberealiseda1-loopsystemwithaloadindependentcontrol.Itisusedincrawlerexcavatorssmaller20tonandwheeledexcavatorsNegativeControlItisaOpenC
7、entresystemmainlyusedfromJapaneseandKoreancompanies.InneutralthepumpalwayssaturatestheNCorifices.Whenamainspoolgetsmovesoutofcentre,theneutralclosesandthepressureattheNCorificedrops.Thisswivelsoutthepump.ThreeDifferentSystemsPositivecontrolThisisalsoaOpenCentresystem,basedonthe
8、NCsystems.ThereisatendencyofJapanesecompaniesmovingtow
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