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

外文翻译--矫正扁轧制品现代化设备的自动化 英文版.pdf外文翻译--矫正扁轧制品现代化设备的自动化 英文版.pdf -- 5 元

宽屏显示 收藏 分享

页面加载中... ... 广告 0 秒后退出

资源预览需要最新版本的Flash Player支持。
您尚未安装或版本过低,建议您

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
编号:201311171206456230    大小:63.44KB    格式:PDF    上传时间:2013-11-17
  【编辑】
5
关 键 词:
教育专区 外文翻译 精品文档 外文翻译
温馨提示:
1: 本站所有资源如无特殊说明,都需要本地电脑安装OFFICE2007和PDF阅读器。图纸软件为CAD,CAXA,PROE,UG,SolidWorks等.压缩文件请下载最新的WinRAR软件解压。
2: 本站的文档不包含任何第三方提供的附件图纸等,如果需要附件,请联系上传者。文件的所有权益归上传用户所有。
3.本站RAR压缩包中若带图纸,网页内容里面会有图纸预览,若没有图纸预览就没有图纸。
4. 未经权益所有人同意不得将文件中的内容挪作商业或盈利用途。
5. 人人文库网仅提供交流平台,并不能对任何下载内容负责。
6. 下载文件中如有侵权或不适当内容,请与我们联系,我们立即纠正。
7. 本站不保证下载资源的准确性、安全性和完整性, 同时也不承担用户因使用这些下载资源对自己和他人造成任何形式的伤害或损失。
  人人文库网所有资源均是用户自行上传分享,仅供网友学习交流,未经上传用户书面授权,请勿作他用。
0条评论

还可以输入200字符

暂无评论,赶快抢占沙发吧。

当前资源信息

4.0
 
(2人评价)
浏览:12次
英文资料库上传于2013-11-17

官方联系方式

客服手机:17625900360   
2:不支持迅雷下载,请使用浏览器下载   
3:不支持QQ浏览器下载,请用其他浏览器   
4:下载后的文档和图纸-无水印   
5:文档经过压缩,下载后原文更清晰   

相关资源

相关资源

相关搜索

教育专区   外文翻译   精品文档   外文翻译  
关于我们 - 网站声明 - 网站地图 - 友情链接 - 网站客服客服 - 联系我们
copyright@ 2015-2017 人人文库网网站版权所有
苏ICP备12009002号-5