会员注册 | 登录 | 微信快捷登录 支付宝快捷登录 QQ登录 微博登录 | 帮助中心 人人文库renrendoc.com美如初恋!
站内搜索 百度文库

热门搜索: 直缝焊接机 矿井提升机 循环球式转向器图纸 机器人手爪发展史 管道机器人dwg 动平衡试验台设计

   首页 人人文库网 > 资源分类 > PDF文档下载

外文翻译--矫正扁轧制品现代化设备的自动化 英文版.pdf

  • 资源星级:
  • 资源大小:63.44KB   全文页数:8页
  • 资源格式: PDF        下载权限:注册会员/VIP会员
您还没有登陆,请先登录。登陆后即可下载此文档。
  合作网站登录: 微信快捷登录 支付宝快捷登录   QQ登录   微博登录
友情提示
2:本站资源不支持迅雷下载,请使用浏览器直接下载(不支持QQ浏览器)
3:本站资源下载后的文档和图纸-无水印,预览文档经过压缩,下载后原文更清晰   

外文翻译--矫正扁轧制品现代化设备的自动化 英文版.pdf

ThecompanySeverstalcompletedthesuccessfulintroductionofnewinlineplatestraighteningmachinesPSMsonits2800and5000millsinAugust20031,2,3.ThemaindesignfeaturesofthemachinesareasfollowseachmachineisequippedwithhydraulicholddownmechanismstoimprovethedynamicsandaccuracyofthemachineadjustmentsandmorereliablymaintainaconstantgapthemachineshavemechanismstoindividuallyadjusteachworkrollerwiththeaidofhydrauliccylindersthisbroadenstherangeofstraighteningregimesthatcanberealizedbyprovidingameasureofcontroloverthechangeinthecurvatureoftheplateeachworkrollerisprovidedwithitsownadjustabledrivetoeliminaterigidkinematicconstraintsbetweenthespindlesthesystemofrollersofthePSMisenclosedincassettestofacilitaterepairsandreducerollerreplacementcoststhePSMhasasystemthatcanbeusedtoadjustthemachinefromaninerollerstraighteningschemetoafiverollerschemeinwhichthedistancebetweentherollersisdoubledthisisdonetowidentherangeofplatethicknessesthatthemachinecanaccomodate.Thus,thenewstraighteningmachineisasophisticatedmultifunctionsystemofmechanismsthatincludesawiderangeofhydraulicallyandelectricallydrivencomponentscontrolledbydigitalandanalogsignals.TheentirecomplexofPSMmechanismscanbedividedintotwofunctionalgroupsthemaingroup,whichincludesthemechanismsthatparticipatedirectlyinthestraighteningoperationtheholddownmechanisms,themechanismsthatindividuallyadjusttherollers,themechanismsthatadjustthecomponentsfordifferentstraighteningregimes,themechanismthatmovesthetoprollerofthefeeder,andthemaindrivetheauxiliarygroupwhichincludesthecassettereplacementmechanism,thespindlelockingmechanism,andtheequipmentthatcoolsthesystemofrollers.AlthoughthePSMhasalargenumberofmechanisms,theuseofmodernhydraulicandelectricdriveshasmadeitpossibletoalmostcompletelyautomatethemainandauxiliaryoperationsperformedonthePSMandtheunitsthatoperatewithit.Describedbelowarethefeaturesandtheautomaticcontrolsystemsforthemostimportantmechanismsoftheplatestraighteningmachine.Theoperatingregimesofthosemechanismsarealsodiscussed.ThehydraulicholddownmechanismsHHMsofthesheetstraighteningmachinefunctionintwomainregimestheadjustmentregimetheregimeinwhichthespecifiedpositionsaremaintained.Therearecertainrequirementsforthecontrolsystemandcertainefficiencycriteriaforeachregime.Intheadjustmentregime,thecontrolsystemforthehydraulicholddownmechanismsmustdothefollowingsynchronizethemovementsofthehydrauliccylindersandkeeptheangulardeeflectionwithinprescribedlimitsmaximizespeedinadjustingthemachineforanewplatesizemaintainahighdegreeofaccuracyinpositioningthemechanismsMetallurgist,Vol.48,Nos.7–8,2004AUTOMATINGTHECONTROLOFMODERNEQUIPMENTFORSTRAIGHTENINGFLATROLLEDPRODUCTSYu.N.Belobrov,V.G.Smirnov,A.I.Titarenko,V.A.Perekhodchenko,andI.L.SinelnikovUDC621.982NovokramatorskMachinePlantAO.TranslatedfromMetallurg,No.8,pp.51–56,August,2004.406Thecontrolsystemhasthefollowingrequirementswhenoperatinginthemaintenanceregimestabilizethecoordinatesofthetopcassetteandthetoprollerofthefeederwithahighdegreeofaccuracyminimizethetimeneededtoreturntheequipmenttotheprescribedcoordinateswhendeviationsoccursuchasduetotheforceexertedbyaplatebeingstraightened.Needforsynchronization.ExperienceinoperatingtheplatestraighteningmachineinplateshopNo.3atSeverstalhasshownthatthemostproblematicfactorinadjustingthemachineisthenonuniformityoftheforcesappliedtothehydrauliccylinders.ThisnonuniformityisduetotheasymmetricdistributionofthemassesofthemovingpartsofthePSMinparticular,theeffectoftheweightofthespindleassembly.Displacementofthehydrauliczeropointrelativetotheelectricalzeropointintheservovalvesisalsoacontributingfactor.Thelatterreasonismoresignificant,thesmallerthevolumeofthehydrauliccylinder.Thus,theHHMofthetoprollerofthefeederisthemostsensitivetodriftofthezeropoint.Therearealsootherfactorsthataffectthedynamism,simultaneousness,andsynchronismoftheoperationoftheholddownmechanismsdifferentiationofthefrictionalforcesonpartsofthehydrauliccylindersduetodifferentcombinationsofdeviationsinthedimensionsofthematedparts,despitethenarrowtolerancesdifferencesinthespringingcharacteristicsandtheindicescharacterizingtheinertiaofthehydraulicsupplychannelsduetodifferencesinthelengthsofthepipesleadingfromtheservovalvestothehydrauliccylinders.Thus,sincethePSMisnotequippedwithdevicestomechanicallysynchronizetheoperationofthecylinders,thetransmissionofsignalsofthesameamplitudetotheinputsoftheservovalvesinevitablyresultsinaspeeddifferencethatcanseriouslydamagethemechanisms.Tominimizeandeliminatetheeffectsoftheabovementionedfactors,wedevelopedanalgorithmforelectricalsynchronizationoftheholddownmechanisms.TheHHMofthetopcassette,composedoffourholddowncylindersandfourbalancingcylinders,isdesignedtoensuremobileadjustmentofthemachinetosettherequiredsizeofstraighteninggapinaccordancewiththethicknessoftheplateandmaintainthatgapwithaspecifiedaccuracyinthepresenceandabsenceofaloadonthehousingsfromthestraighteningforce.Thehydraulicsystemoftheholddownmechanismisdesignedinsuchawaythatonlyonechamberofthehydrauliccylindersisusedastheworkingchamber.Thesecondchamberisalwaysconnectedtothedischargechannel.Thetopcassetteisloweredwhenthebalancingforcesareovercomebytheholddowncylinders.Thecassetteisraisedonlybytheactionofthebalancingcylinders.Thisarrangementhasmadeitpossibletoeliminategapsinthepositioningoftheequipment.407Fig.1.Blockdiagramofthecontrolsystemofthehydrauliccylinder.Thehydrauliczeropointisthepositionthattheslidevalveoccupieswhenitcoversthedeliveryanddischargemains.Theelectricalzeropointisthecontrolsignalthatshouldmovethevalvetothehydrauliczeropoint.Thesepointsshouldideallycoincide,butinactualservovalveswithzerooverlapthereisalwaysacertainamountofdisplacementthatresultsinleakageofthehydraulicfluid.TheHHMofthetoprollerofthefeederconsistsoftwohydrauliccylinders.Hydraulicfluidisfedintotheplungerchamberwhentherolleristobeloweredandisfedintotherodchamberwhenitistoberaised.ControlPrinciples.IndividualcircuitshavebeenprovidedFig.1tocontrolthehydrauliccylindersoftheholddownmechanisms.ThecontrolsignalXctlsenttotheinputoftheservovalveisformedbyaproportionalintegralPIcontrollertoimprovethesensitivityofthesystem,wechosetousevalveswithzerooverlap.ThesignalsenttotheinputofthecontrollertheerrorsignalXerrisformedasthedifferencebetweenthecontrolpointsignalforpositionXcptandthefeedbacksignalXf.b.ThelattersignalisreceivedfromthelineardisplacementgageGofthegivenhydrauliccylinder.ThegagesoftheHHMforthetopcassettearebuiltintothebalancinghydrauliccylindersHCs.Thecylindersareinstalledinsuchawaythattheirmovementscanbeconsideredtobeequaltothedisplacementsofthecorrespondingcylinderrods,withallowanceforcertaincoefficients.ThegagesintheHHMforthetoprollerofthefeederareincorporateddirectlyintotheholddowncylinders.Theintegralpartofthecontrollerisactivatedonlyduringthefinaladjustmentstageandduringstabilizationoftheprescribedcoordinate.Whenthedisplacementsexceedacertainthresholdvalue,thefunctionsofthePIcontrolleraretakenoverbyaproportionalPcontrollerwiththetransferfunctionWsk.Thus,XctltkXerrt.Whentherearesignificantdifferencesbetweenthedisplacementsoftheworkingrollers,thedifferenceerrorbetweenthecontrolpointandthefeedbacksignalfromthelineardisplacementgagereachesvaluesgreatenoughsothattheoutputsignalwhichcontrolstheoperationoftheservovalvereachesthesaturationzone.Inthiscase,furtherregulationofthedisplacementrateand,thussynchronizationofthemovementsofthecylindersbecomesimpossibleaslongastheerrorexceedsthevalueatwhichXctlisgreaterthantheboundaryvalueforthesaturationzoneXsat.Thelimitingerror–thelargesterrorforwhichXctldoesnotreachsaturation–isinverselyproportionaltothegainofthecontrollerkXerrXsat/k.SolvingthegivenproblembydecreasingkleadstoalossofspeedintheadjustmentofthePSMandadecreaseincontrolaccuracyduringthestraighteningoperation.Thus,tokeepthecontrolsignalfromreachingthesaturationzonewhentherearesubstantialdisplacements,thesystemwasdesignedsothattheinputofthecontrollerisfednottheactualrequiredvalueXrqbutanincrementDXofamagnitudesuchthattheconditionkDXXsatissatisfied.ThecontrolpointisincreasedbytheamountDXafterthepositionofthecylinderhasbeenchangedbytheamountcorrespondingtotheincrementhavingthelargestlagrelativetothecylindersdirectionofmotion.TheadjustmentofthecontrolpointiscontinueduntilthedifferencebetweentherequiredvalueandtheactualpositionofthemechanismbecomeslessthantheincrementXrq–Xf.bDX.ThentheinputofthecontrollerisfedthevalueXcpt,whichisequaltotherequiredadjustmentXcptXrq.Theadjustmentisthuscompleted.Useoftheprincipleofasteppedincreaseinthecontrolpointmakesitpossiblesynchronizethemovementsofthecylindersandsetthecontrolpointwithahighdegreeofaccuracyforalmostanyidealrepetitionfactor.MechanismsforIndividualAdjustmentoftheWorkingRollers.Theplatestraighteningmachineisdesignedsothateachworkingrollercanbemovedvertically,whichisdonebymeansofahydrauliccylinderactinginconcertwithaVbeltdrive.Thecylindersaresuppliedwithpowerfromservovalvesoperatedwithproportionalcontrol.Alineardisplacementgageisbuiltintoeachcylindertoobtainafeedbacksignalonthepositionoftheroller.Sincethesegagesareactuallytransmitinginformationonthepositionofthecylinderrodsratherthantheworkingrollersthemselves,thefollowingconversionisperformedtoobtaintherollerscoordinatesXrolkredXf.b,wherekredisthegearratioofthedriveXf.bisthepositionofthecylinderrodmeasuredbythelineardisplacementtransducers.Thus,apositionfeedbackcircuitisprovidedtocontrolthepositionofeachworkingroller.Figure1presentsadiagramofoneofthecircuits.ThecontrolsignalsaregeneratedbymeansofthePIcontrollere,whichhasmadeitpossibletoachieveahighdegreeofaccuracyinadjustingthesystemwithoutsacrificingspeed.408Theindividualdriveoftherollers.Theabovedescribeddesignisbasedontheuseofindividualacdriveswithmotorsofdifferentpowersfedfromfrequencyconverters.Eachindividualdriveoffersthefollowingadvantagesoveragroupdrivegreaterreliabilitythankstotheabsenceofadditionalloadsonthecomponentsofthemechanismsduetodifferencesbetweenthelinearvelocitiesoftheworkingrollersandthespeedoftheplatethepossibilitythatthemachinecouldcontinuetooperateifoneorevenseveraldrivesmalfunctioninthiscase,thecorrespondingrollerswouldberemovedfromthestraighteningzonethepossibilitythatthelinearvelocitiesoftherollerscouldbeindividuallycorrectedinaccordancewiththeactualspeedoftheplatesuchacorrectioncouldbemadeeitherasapreliminarymeasureonthebasisofmeasuredandcalculatedvaluesorduringthestraighteningoperationonthebasisofthedataobtainedfromthefrequencyconverters,whichemployartificialintelligence.Themaindriveofthestraighteningmachinerotatesninestraighteningrollersandtwohousingrollers.Thisdrivemustbehighlyreliableinoperation,sincethefactthatthePSMisinstalledinthemilllinemeansthatsizableproductionlossescanbeincurredifthedrivefailstoworkproperlyevenforashortperiodoftime.Therequirementsthatmustbesatisfiedbythedrivearedeterminedbytheoperationalanddesignfeaturesofthemachineasawholetheplatebeingstraightenedmustcreatearigidkinematiccouplingbetweenthestraighteningrollers,therollersofthehousing,andtheadjacentsectionsoftherollerconveyorstheplateshouldundergoelongationduringthestraighteningoperationasaresultofplasticdeformation,withtheincrementsinlengthbeingdifferentoneachworkingrollerduetothedifferentiationofthebendingradiithissituationleadstoanonuniformincreaseinthespeedoftheplateasitmovestowardtheendofthePSMitmustbepossibletouseworkingrollersofdifferentdiametersthisbeingdone,forexample,duetononuniformwearorregrindingtheloadsontherollersshouldbedifferentiatedinaccordancewiththechosenstraighteningregimereversestraighteningshouldbepossible.Inlightoftheabovefactorsandtheactualoperatingregimesoftheplatestraighteningmachinebeingdiscussedhere,thefollowingrequirementscanbeestablishedfortheelectricdriveregulationofspeedwithinbroadlimits,includingstartupofthemotorsunderloadoperationinthereverseregimearigidcharacteristicwƒMhighdegreeofaccuracyinmaintainingtheprescribedspeedfullysynchronousoperation.Theelementbase.Thedriveoftherollerswasbuiltwiththeuseofasynchronousthreephasemotorshavingashortcircuitrotor.ThemotorsweredesignedbytheGermancompanyVEM.Theycancontinuetofunctionundersevereoverloadsandarereliableinoperation.ThemotorsarecontrolledbySIMOVERTfrequencyconvertersmadebytheGermanfirmSiemens.Theirmodulardesignfacilitatesmaintenanceandrepair,andthepresenceofabuiltinmicroprocessorblockmakesitpossibletoexecutemostofthefunctionsinvolvedincontrollingtheoperationofthedrivemaintaintheprescribedspeedwithahighdegreeofstability,recalculatethefrequencyofrotationinaccordancewiththeactualdiametersoftherollers,diagnosetheconditionofthedrive,controlthedrivesoperation,andexchangeinformationonthePROFIBUSnetwork.Motorsofdifferentpowersareusedinthesystembecauseofthedifferentiateddistributionofthemomentsbetweentheworkingrollers.Usingdifferentmotorshasmadeitpossibletosignificantlyreducethecostoftheelectricalequipmentandimprovetheperformancecharacteristicsofthemachineasawhole.Themachinehasthreemainoperatingregimestheworkingregimesemiautomaticandautomatic,thetransportregime,andthecassettereplacementregime.Figure2showsablockdiagramoftheoperationsconnectedwithrealizationoftheworkingregime.Inthesemiautomaticvariantofthisregime,theoperatorcontrolsthePSMfromacontrolpanel.Inthiscase,theoperatorcandothefollowingchoosethestraighteningregimefromadatabasecorrectthechosenregimeadjusttheregimemanually,which409

注意事项

本文(外文翻译--矫正扁轧制品现代化设备的自动化 英文版.pdf)为本站会员(英文资料库)主动上传,人人文库网仅提供信息存储空间,仅对用户上传内容的表现方式做保护处理,对上载内容本身不做任何修改或编辑。 若此文所含内容侵犯了您的版权或隐私,请立即通知人人文库网([email protected]),我们立即给予删除!

温馨提示:如果因为网速或其他原因下载失败请重新下载,重复下载不扣分。

copyright@ 2015-2017 人人文库网网站版权所有
苏ICP备12009002号-5