外文翻譯--液壓傳動控制.doc

附錄一英文文獻(xiàn)：Hydraulictransmissioncontrolisoftenusedinindustry,akindofcontrolmode,itadoptshydrauliccompletedtheprocessofenergy.Becausehydraulictransmissioncontrolmodeofflexibilityandconvenience,hydrauliccontrolinindustrybyextensiveattention.Hydraulictransmissionisresearchtohavepressurefluidforenergymedium,toachievevariousmachineandautomaticcontrolsubjects.Hydraulictransmissionusingthiskindofelementtoallkindsofcontrolcircuitneededsomeloop,againbyorganiccombinationbecomecompletionofacertaincontrolfunctionsoftransmissionsystemtocompleteenergytransferandconversionandcontrol.Fromtheprinciplespeaking,hydraulictransmission,basedonthebasicprinciple,thatis,theprincipleisPASCALpressureofthefluidisconsistentthroughoutthebalance,sothatinthesystem,thesmallerthepistontoppressuresaresmall,andbigonthepistonisalsogreatpressurefrom,thismaintainstheliquidstatic.Sothroughtheliquidtransfer,cangetdifferentservethedifferentpressure,whichcanachievethepurposeofatransformation.Wehavecommontothehydraulicjackistousethisprincipletoachievepowertransfer.Hydraulictransmissionprincipleofhydraulicdriveneededelementsaremainlypowercomponents,actuators,controlelements,auxiliarycomponentsetc.Includinghydraulicpowercomponentsisforhydraulicsystemproducesthepowercomponents,includingvarioushydraulicpump.Hydraulicpumprelyonvolumevariationprincipleforthejob,andsoarealsocommonlycalledvolumehydraulicpump.Gearpumpisthemostcommonkindofhydraulicpump,itthroughthegearsturningtwomeshcampaignmakesaliquid.Otherhydraulicpumpandvanepump,pistonpump,intheselectionofhydraulicmajorproblemsneedingattentionincludeenergyconsumption,efficiency,reducenoise.Hydraulicactuatorsisusedtoexecutewillprovidehydraulicpumpcanturnintomechanicaldevice,mainlyincludinghydrauliccylinderandhydraulicpressuremotor.Hydraulicmotorisworkingwithhydraulicpumptodotheoppositeofthedevice,namelythehydraulicenergyconversion,whichiscalledtheforeignpowerenergy.Hydrauliccontrolelementsareusedtocontroltheflowoffluiddirection,pressureandtheheightofthesizeoftheexpectedtoflowcontrol,tomeetthespecificrequirements.Justbecauseofthehydrauliccontrolcomponentsflexibility,makesthehydrauliccontrolsystemcanaccomplishofdifferentactivities.Hydrauliccontrolelementsaccordingtousecanbedividedintopressurevalves,flowcontrolvalves,directioncontrolvalves.Accordingtotheoperationmodecanbedividedintohumanmanoeuvringvalve,mechanicalmanipulationmethod,electricmanoeuvringvalve,etc.Inadditiontotheabovecomponentsoutside,hydrauliccontrolsystemneedhydraulicauxiliarycomponents.Thesecomponentsincludingpipeandtubefittings,oiltank,filters,accumulatorandsealingdevices.Throughtheaboveeachdevice,wecanbuildahydrauliccircuits.Theso-calledhydraulicloopthroughvarioushydrauliccomponentsisthecorrespondingcontrolcircuit.Accordingtothedifferentcontroltarget,wecandesigndifferentcircuit,suchaspressurecontrolcircuit,speedcontrolcircuit,multi-cylinderworkcontrolcircuit,etc.Accordingtothestructureandcharacteristicsofhydraulicdriveinhydraulicsystemdesign,system,thefirsttoanalysis,then,theprinciplediagramworked,includingsystemwiththisprinciplechartisthesymbolofhydraulicmachinery.Throughcalculatingchoosehydraulicdeviceafterthecompletesystem,andthenagainthedesignanddebug.Inthisprocess,theprinciplechartdrawingisthemostcritical.Itdecidedtoadesignsystemoftheprosandcons.Hydraulictransmissionappliedisstrong,suchasloadingandunloadingDuiMamachinehydraulicsystem,whichisusedasastoragemachinery,inmodernwarehouseuseittoachievetextilesbag,oil,barrelandothergoodsofloadingandunloadingmechanizationwork.Canalsobeusedinuniversalcylindricalgrinderhydraulicsystem,productionpractice.Thesystemischaracteristicofpowerislarger,theproductionefficiencyishigher,stabilityisbetter.Hydraulicasawideapplicationtechnology,inthefutureisabroadprospect.Alongwiththedevelopmentofcomputer,hydrauliccontrolsystemcanandintelligentcontroltechnology,computercontroltechnology,technology,sothattheycancombineinmoreplaces,alsocanplaytheroleinmoresophisticated,moreflexibilitytoaccomplishitscontroltasks譯文：液壓傳動控制是工業(yè)中經(jīng)常用到的一種控制方式，它采用液壓完成傳遞能量的過程。因為液壓傳動控制方式的靈活性和便捷性，液壓控制在工業(yè)上受到廣泛的重視。液壓傳動是研究以有壓流體為能源介質(zhì)，來實現(xiàn)各種機械和自動控制的學(xué)科。液壓傳動利用這種元件來組成所需要的各種控制回路，再由若干回路有機組合成為完成一定控制功能的傳動系統(tǒng)來完成能量的傳遞、轉(zhuǎn)換和控制。從原理上來說，液壓傳動所基于的最基本的原理就是帕斯卡原理，就是說，液體各處的壓強是一致的，這樣，在平衡的系統(tǒng)中，比較小的活塞上面施加的壓力比較小，而大的活塞上施加的壓力也比較大，這樣能夠保持液體的靜止。所以通過液體的傳遞，可以得到不同端上的不同的壓力，這樣就可以達(dá)到一個變換的目的。我們所常見到的液壓千斤頂就是利用了這個原理來達(dá)到力的傳遞。液壓傳動基本原理液壓傳動中所需要的元件主要有動力元件、執(zhí)行元件、控制元件、輔助元件等。其中液壓動力元件是為液壓系統(tǒng)產(chǎn)生動力的部件，主要包括各種液壓泵。液壓泵依靠容積變化原理來工作，所以一般也稱為容積液壓泵。齒輪泵是最常見的一種液壓泵，它通過兩個嚙合的齒輪的轉(zhuǎn)動使得液體進(jìn)行運動。其他的液壓泵還有葉片泵、柱塞泵，在選擇液壓泵的時候主要需要注意的問題包括消耗的能量、效率、降低噪音。液壓執(zhí)行元件是用來執(zhí)行將液壓泵提供的液壓能轉(zhuǎn)變成機械能的裝置，主要包括液壓缸和液壓馬達(dá)。液壓馬達(dá)是與液壓泵做相反的工作的裝置，也就是把液壓的能量轉(zhuǎn)換稱為機械能，從而對外做功。液壓控制元件用來控制液體流動的方向、壓力的高低以及對流量的大小進(jìn)行預(yù)期的控制，以滿足特定的工作要求。正是因為液壓控制元器件的靈活性，使得液壓控制系統(tǒng)能夠完成不同的活動。液壓控制元件按照用途可以分成壓力控制閥、流量控制閥、方向控制閥。按照操作方式可以分成人力操縱閥、機械操縱法、電動操縱閥等。除了上述的元件以外，液壓控制系統(tǒng)還需要液壓輔助元件。這些元件包括管路和管接頭、油箱、過濾器、蓄能器和密封裝置。通過以上的各個器件，我們就能夠建設(shè)出一個液壓回路。所謂液壓回路就是通過各種液壓器件構(gòu)成的相應(yīng)的控制回路。根據(jù)不同的控制目標(biāo)，我們能夠設(shè)計不同的回路，比如壓力控制回路、速度控制回路、多缸工作控制回路等。根據(jù)液壓傳動的結(jié)構(gòu)及其特點，在液壓系統(tǒng)的設(shè)計中，首先要進(jìn)行系統(tǒng)分析，然后擬定系統(tǒng)的原理圖，其中這個原理圖是用液壓機械符號來表示的。之后通過計算選擇液壓器件，進(jìn)而再完成系統(tǒng)的設(shè)計和調(diào)試。這個過程