混凝土泵车液压系统的认识外文文献翻译中英文翻译.docx
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混凝土泵车液压系统的认识外文文献翻译中英文翻译
译文原文：
Understandingofconcretepumphydraulicsystem
ItalianCIFAConcreteMachineryCompany
（1.CIFAconcretemechanicalpumpInstitute,Italy）
PumpingHydraulicsystem
Boomhydraulicsystem
Outriggerhydraulicsystem
Hydraulicsystemdiagram
Dailycheckandmaintenanceofthehydraulicsystem
Thefunctionsofthetruckmountedconcretepump,hydraulicsystemcanbedividedintopumpinghydraulicsystem,boomhydraulicsystem,outriggerhydraulicsystem.
PumpingHydraulicsystemIsdividedintothreeparts:
mainpumpingsystem,distributionandlubricatingsystem,mixingandcoolingandcleaningsystem.
Mainpumpingsystem
Therearetwohydraulicloops:
openandcloseloop.
TheOpenloop:
usesanA11VLO190variabledisplacementofaxialpistonpump.Itisfittedwithaconstantpowercontroldevice,pressurecut-offvalveandelectrical
strokelimiterwithproportionalsolenoid.Theconstantpowercontroldevicehasbeensetinthefactory.Thedisplacementcanbeadjustedfrom0toMaximumbyturningtheoilpumpdisplacementpotentiometeronthecontrolpanelfromlowtohigh.
Fig.1A11VLO190
A，BServiceport（withoutchargingpump）420bar
SSuctionport（withchargingpump）35bar
T1,T2Airbleed,tank
RAirbleed,oildrain
M1Measuringpoint,regulatingchamber
MMeasuringpoint,serviceport
GPortforpositioningpressure（controller）forversionwithstrokelimiter（H..,U2）,HDandEPwithscrewedfittingGE10–PLM（otherwiseportGclosed）
Theotheristhecontrolline,whichcanchangetheflowdirectionandthedisplacementofmainpumpthroughconstantpowervalve,proportionalsolenoidpressurereducingvalve,directionalcontrolvalveandservovalveofmainpump.
TheClosedloop:
Thereisanauxiliarypumpwithreliefvalvethatthesettingpressureis3.5MpainA4VG180.Theauxiliarypumphastwooutputways.Oneisthechargeoilline,whichconnectswithsuctionlineofmainpumpthroughthecheckvalveintwopressurereliefvalvesandaddoiltomainpump.Atthesametimeexcessivehydraulicoilreturntooiltankthroughflushingvalveandcoolertorealizeheatexchangeforclosedloop.
A,BServicelineportsSAE11/4",highpressureseries420bar
T1Casedrainorfillingport
T2CasedrainM33×2;18deep
MA,MBPressuregauge-operatingpressureA,B
RAirbleed
SBoostsuctionport
X1,X2Controlpressureports（beforetheorifice）
GPressureportforauxiliarycircuit
PSControlpressuresupply
FaFilteroutlet
Fa1Filteroutlet（filterassembly）
FeFilterinletM33×2;18deep
FSPortfromfiltertosuctionline（coldstart）
MHPortforbalancedhighpressure
Y1,Y2Remotecontrolports（onlyforHDcontrol）
Flushingvalve
Usedforclosedlooptopreventexcessiveheatbuild-upinclosedcircuitoperation.Thesettingpressureofflushingvalveis3.0MPa
Pressurereducingvalvewithproportionalsolenoid
Usedforclosedloop.TheOutputpressureisconnectedwiththeremotecontrolportofmainpumptocontrolthedisplacementandiscontrolledbyaproportionalcurrentsignalandconstantpowervalve.Thedisplacementcanbeadjustedfrom0toMaximumbyturningthedisplacementadjustingpotentiometer.
Constantpowervalve
Pilotpressuresetting
Powersetting
Usedforclosedloop.Whenthehydraulicsystempressureisoverthesettingpressure,thevalveworkstoreducetheoutputpressureofthepressurereducingvalveandmaintaintheconstantpower.
Fig.3Constantpowervalve
Mainpumpsuctionfilter
Openloop:
filtrationfineness100u.
Closeloop:
filtrationfineness20u.
Whentheindicatorinthevacuumgaugeexceedsthesafeareaortheelectricsignalinstrumentgivesawarning,thecartridgemaybeblocked.Itshouldbecleanorreplacefiltercartridgepromptly.
Filterfiltrationfinenessis20uinopenloop.Whenthereadingpressureofthevacuumgaugeexceeds0.35Mpa,thecartridgemaybeblocked.Itshouldbecleanor
Returnfilter
replacefiltercartridgepromptly.
Filterfiltrationfinenessis10uinclosedloop.Whentheelectricitydeliverreportstothepolice,thecartridgemaybeblocked,itshouldbecleanorreplacefiltercartridgepromptly.
Distributionandlubricatingsystem
Constantpressurepump
Settingscrewforpressurecontrolzero/Strokepressure
Fig.4Constantpressurepump
AnA10VO28constantpumpisusedforthedistributionsystemofsupplyoil.
Thesettingofthepressurecontrolvalveofthepumpis16Mpa.Oncethesystempressureisreached,thebumpwillkeepthispressurethendecreasethedisplacement.Thereisapressurereliefvalveinthedistributioncircuittoactasasafetyvalve,whichissetto18Mpa.
Plateballvalve（shut-offvalve）
Usedtodischargetheaccumulator.Itmustberotatedtheleverofshut-offvalveanti-clockwisewhenthepumpingfinishesorstoppedformaintenance,inordertodischargethepressureoftheaccumulator.（Pressuregaugeofdistributionsystemiszero）
Accumulator
Inflationpressureis8-9Mpa.UseOnlyNitrogentofilltheaccumulator.Chargingpressureshouldnotexceedthesefigures.
Lubricatingsystem
Therearetwotypes.Oneisreciprocatingcentralizedlubricationthatisdrivenbyoilfromtheswingcylindersofdistributionsystemincludeslubricatingsinglepump（ordoublepump）,distributor,damperandfilter.TheotherisautomaticcentralizedlubricationthatisdrivenbyaD.Cmotorwithanindependentgreasetankandindependentfromthehydraulicsystem.Theintervaltimeoflubricationiscarriedoutinthefactory.Thelubricationsystemworksautomaticallywhenpumping.
Mixing,cooling,cleaningsystem
OnlytheMixing,cooling,cleaningsystemaredrivenbymotorinopenloop.
Gearpump
Gearpumpsuppliesoiltothemixing,cooling,cleaningsystem.
Sandwichtypereliefvalve
Thepressureissetto14Mpa.
Ressurerelay
Ifthemixingbladeisstuck,thesystempressurewillraise.Whenthepressureexceedsthesettingvalue（usually10Mpa）,thepressurerelaywillgiveawarning.TheSolenoiddirectionalcontrolvalvechangesdirectiontoletthemixingmotortorotateanti-clockwise.After6secondthesolenoidvalvewillreset,andthemixingmotorwillrotateclockwiseagain.
Returnfilter
Thefiltrationfinenessis10uinclosedloop.Thecartridgemaybeblockedwhentheelectricalarmsounds.Itshouldbereplacepromptly.
Boomhydraulicsystem
Boompump
Boomandoutriggerusethesamepump.
37mand40mtruckmountedconcretepumps:
A2FO23fixeddisplacementpump
44mand47mtruckmountedconcretepumps:
A7VO55LRDSvariabledisplacementpump,orA7VO55DRSvariabledisplacementpump
46mand49mtruckmountedconcretepumps:
A7VO55LRDSvariabledisplacementpump
Fig.5A7VO55DRSFig.6A7VO55LRDSFig.7A2FO23
Boomproportionaldirectionalspoolvalve
Theproportionaldirectionalspoolvalvewithelectro-hydraulicconsistsofpressurereliefvalve,pressurereducingvalve,andflowcontrolvalve,andcanbe
controlledmanualorbyremotecontrol.
Fig.8Boomproportionaldirectionalspoolvalve
Load-holdingvalve
Load-holdingvalvehasthreefunctions.
（1）Itactsasalockwhenthecylinderisn’tmoving.
（2）Load-holdingvalvehastwicerelieffunctiontoprotectboomagainstvibrating.Itwillbeadjustedinthefactory.（3）Whentheboommovesdownwardas
Slewingload-holdingvalve
gravityload,itcanlimitspeedtopreventtheboomfallingtooquicklyandshaking.
Therearethreemainfunctions.Lock,overloadprotectionandspeedlimiting.
Outriggerhydraulicsystem
Outriggerhydraulicsystemandboomhydraulicsystemareusedthesamepumptosupplyoil.Outriggersshouldbesetupbeforetheboomisoperatedbythecontrolleversorelectriccontrolbuttononbothsidesofthetruckmountedconcretepump.
Outriggerproportionaldirectionalspoolvalve
Itisanintegratedunitwithareliefvalveinsidetocontrolmaximumpressureoftheoutriggerhydraulicsystem.
Fig.9Outriggerproportionaldirectionalspoolvalve
Outriggerhydrauliclock
Itisusedtolocktheoutriggercylindersandpayattentiontotheverticalmovingoftheoutriggercylinderwhenworking.
中文译文：
混凝土泵车液压系统的认识
意大利CIFA混凝土机械公司
（1.CIFA混凝土机械泵车研究所,意大利，）
泵送单元液压系统
臂架液压系统
支腿液压系统
液压原理图
液压系统的日常保养及维护
泵车液压系统按泵车功能可划分为泵送单元液压系统、臂架液压系统、支腿液压系统。
泵送单元液压系统
泵送单元液压系统按功能可分为三大部分：
主泵送油路系统；分配及润滑油泵驱动系统；搅拌、冷却、清洗油路系统。
主泵送油路系统
主泵送系统按油液循环方式分为开式液压回路和闭式液压回路两种。
主油泵
图1泵A11VLO190
开式液压回路：
采用一个轴向变量柱塞泵，该泵带有恒功率控制装置、压力截流阀和电控变量控制阀，恒功率控制装置出厂时已设定好。
电控面板上油泵排量按钮由小变大范围内调节时，主油泵排量在0～最大范围内变化。
A，B工作油口（不带升压泵）420bar
S吸油口（带升压泵）35bar
T1,T2放气口，油箱
R放气口，放油
M1变量缸测压口
M工作油口测压口
G控制压力油口
对于排量可限制型（H…U2）和HD、EP带紧固螺栓GE10-PLM（其他情况下油口G堵住）
闭式液压回路：
采用A4VG180双向周向变量柱塞泵，该泵带内置补油泵，补油溢流阀调定压力3.5MPa，其出口油路可分为两路：
第一路为补油油路，通过两高压溢流阀内的单向阀，始终与主泵吸油油路相通，对主泵送油路进行补油，同时多余的油液经冲洗阀、冷却器流回油箱，实现对闭式油路系统的热交换。
第二路为控制油路，经恒功率阀、电磁比例减压阀、换向阀及泵内伺服缸伺服阀，实现主泵的变量及液流流动方向的改变。
图2油泵A4VG180
A,B工作油口SAE11/4"高压系列420bar
T1壳体泄油或注油口
T2壳体泄油口M33×2，深18
MA,MB压力表、工作压力A，B
R放气口
S吸油口
X1,X2控制压力口（在节流孔前）
G辅助回路压力口
PS控制压力供油口
Fa过滤器出口
Fa1过滤器出口（装配过滤器）
Fe过滤器进口M33×2，深18
FS从过滤器到吸油管的接口（冷启动）
MH平衡高压油口
Y1,Y2遥控口（仅对于HD控制）
冲洗阀
仅用于闭式液压回路，用于实现闭式回路油液的交换。
冲洗阀的设定压为为3.0MPa
电磁比例减压阀
仅用于闭式液压回路，其出口压力接主油泵远程控制口，控制油泵排量。
出口压力受比例电流及恒功率阀的控制。
遥控器或电控柜面板上油泵排量旋钮由小变大范围内调节时，主油泵排量在0～最大范围内变化。
恒功率阀
仅用于闭式回路，当回路工作压力超过设定压力时，恒功率阀起作用，减小电
磁比例减压
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