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1、UnderstandingofconcretepumphydraulicsystemItalianCIFAConcreteMachineryCompany(1.CIFAconcretemechanicalpumpInstitute,Italy)PumpingHydraulicsystemBoomhydraulicsystemOutriggerhydraulicsystemHydraulicsystemdiagramDailycheckandmaintenanceofthehydraulicsystemThefunction
2、softhetruckmountedconcretepump,hydraulicsystemcanbedividedintopumpinghydraulicsystem,boomhydraulicsystem,outriggerhydraulicsystem.PumpingHydraulicsystemIsdividedintothreeparts:mainpumpingsystem,distributionandlubricatingsystem,mixingandcoolingandcleaningsystem.Mai
3、npumpingsystemTherearetwohydraulicloops:openandcloseloop.TheOpenloop:usesanA11VLO190variabledisplacementofaxialpistonpump.Itisfittedwithaconstantpowercontroldevice,pressurecut-offvalveandelectricalstrokelimiterwithproportionalsolenoid.Theconstantpowercontroldevice
4、hasbeensetinthefactory.Thedisplacementcanbeadjustedfrom0toMaximumbyturningtheoilpumpdisplacementpotentiometeronthecontrolpanelfromlowtohigh.Fig.1A11VLO190A，BServiceport(withoutchargingpump)420barSSuctionport(withchargingpump)35barT1,T2Airbleed,tankRAirbleed,oildra
5、inM1Measuringpoint,regulatingchamberMMeasuringpoint,serviceportGPortforpositioningpressure(controller)forversionwithstrokelimiter(H..,U2),HDandEPwithscrewedfittingGE10–PLM(otherwiseportGclosed)Theotheristhecontrolline,whichcanchangetheflowdirectionandthedisplaceme
6、ntofmainpumpthroughconstantpowervalve,proportionalsolenoidpressurereducingvalve,directionalcontrolvalveandservovalveofmainpump.TheClosedloop:Thereisanauxiliarypumpwithreliefvalvethatthesettingpressureis3.5MpainA4VG180.Theauxiliarypumphastwooutputways.Oneisthecharg
7、eoilline,whichconnectswithsuctionlineofmainpumpthroughthecheckvalveintwopressurereliefvalvesandaddoiltomainpump.Atthesametimeexcessivehydraulicoilreturntooiltankthroughflushingvalveandcoolertorealizeheatexchangeforclosedloop.A,BServicelineportsSAE11/4",highpressur
8、eseries420barT1CasedrainorfillingportT2CasedrainM33×2;18deepMA,MBPressuregauge-operatingpressureA,BRAirbleedSBoostsuctionportX1,X2Controlpressureports(b
