BST纠偏系统

4.3.3Steering-frameguideSFDD=RollerDiameterLL=RollerLengthSteering-frameguideSF4.3.3.2Principleofoperation:-Webenterstheguidewithincomingerror-SFmovesthewebsideways(proportionalbehaviour)-Duetothemovementtheinfeedangle(angleoftherolleraxistothewebrunningdirection)changes.Duetothechangeoftheinfeedanglethewebbeginstomovesideways(integralbehaviour)intothedesireddirection.-Thewebmovesbacktothecenteroftheroller,andtheactuatorbacktothecentreposition.SF…(.)x…(.)x…AmountofwrappedrollersRollerdiameter(wrappedrollers)Amountofidlerrollers(ifexisting)Rollerdiameter(idlerrollers)RollerlengthExample:SF1x160x1500(inmm)orSF1x6x60(inInch)4.3.3.1LetterKey4.3.3.3PrincipleofoperationofSFStressdistributionatinfeedspan2)Webdeviationtotherighthandside3)ImmediateSF-motiontotheleft(proportionalbehaviour)andsimultaneousmotionofthewebcausedbyinfeedangle90°(integralbehaviour)4)MotionofSFbacktothecenter-positioncausedbylateralmotionofthewebontherollerandthelateralmotionofthewebbecomesslowercausedbythedecreaseoftheinfeedangle1)WebpositionOKPrincipleofoperation4.3.3.4GeometryofSteering-FrameSF4.3.3.4.1SFwithonerollerL-WrapS=ExitSpanL=EnteringSpanKImaginaryPivotPointBigrollerdiametertoenlargethefriction.Rolleroftencoveredf.e.withrubbercork.Geometry-SFwithoneroller4.3.3.4.2SFwithtworollersS=ExitSpanL=EnteringSpanKImaginaryPivotPoint2rollersareusedtoenlargethefriction.Therollerdiametercanbesmallercomparedwith1rollerSF.Oftentheexitroller(sometimesbothrollers)arecoveredi.e.withrubbercork.L-Wrap4.3.3.4.3SFwithtworollersS=ExitSpanL=EnteringSpanKImaginaryPivotPointZ-WrapTheguidingaccuracyandthestressdistributionwiththeSF-Z-WrapisworstcomparedwithallotherSFandDFsolutions.That‘swhythissolutionisnotrecommended.Geometry-SF-Z-WrapwithtworollersExplainationofthelowguidingaccuracywiththeSF-Z-WrapTheguidingdeviceisarranged.EverythingisOK.DesiredwebpositionWebpositioninsensorisOK.Note:theremainingerrorwillincreaseifthesensorismountedneartheSF.DuetothenecessarydynamicguidingbehaviourthesensorcannotbemountedneartothefirstrolleraftertheSF.Situationafterwebdisplacement:TheSFreactsandbringsthewebbacktothesensorDesiredwebpositionRemainingerror,duetotheprinciplebehaviourofthisguidingdevice!LowguidingaccuracywiththeSF-Z-Wrap4.3.3.4.4Specialsolution180°-WrapExitSpanEnteringSpanKImaginaryPivotPoint4.3.3.4.5LayoutofSFL-WrapS=ExitSpanL=EnteringSpanmax.30°max.30°idealmax.1/3SSensorEnteringSpan:L=1.8-2xmax.webwidthExitSpan:S=0.5-1xmax.webwidthPlaneofSF-motionZ-WrapS=ExitSpanL=EnteringSpanmax.30°max.30°idealPlaneofSF-motion½SEnteringSpan:L=1.8-2xmax.webwidthExitSpan:S=0.8-1xmax.webwidthSensorLayout:L-WrapandZ-Wrap180°-WrapS=ExitSpanL=EnteringSpanmax.1/3SSensorEnteringSpanL=ExitSpanS=1.8-2xmax.webwidthImportant:EnteringSpanandExitSpanhavetobeequal.Onlyincaseofverylongspans(2xmax.webwidth)theycanbedifferent.4.3.3.4.6RelationEnteringSpan-Pre-EnteringSpanS=ExitSpanL=EnteringSpanThePre-EnteringSpanhastobeshorterthantheEnteringSpan.Importantspeciallyforstiffmaterial.Additionalrollershavetobemountedifthepre-enteringspanistolongtoachieveaS-Wrap.Reason:theintegralelementwillcreateaninstablebehaviouroftheSFifthebackwardinfluencerangetofar.Thisisthecaseifthepre-enteringspanistoolong.4.3.3.4.7MountingstylesofSF4.3.3.5SFseriesStandardSeriesRollerLengthmin[mm]RollerLengthmax[mm]Roller-ØDStrokemax[mm]WebTensionmax[N]SF-DesignNormalVersionLowProfileVersionNumberofrollers1.1.1.20030060/9050400MiniSFX11.1.2.20030060/9050400MiniSFX22.1.3.30050060/9050400linkarmdesignX12.1.4.6009009050400linkarmdesignX12.1.5.1000150090/120/16050400linkarmdesignX12.1.6.3005009050400linkarmdesignX22.1.7.6009009050400linkarmdesignX22.1.8.1000150090/120/16050400linkarmdesignX22.1.9.1000150090/12050400linkarmdesignX23.2.10.10002000120/160/2001001000KUGdesignX13.2.11.21002500160/2001001000KUGdesignX13.2.12.21002500160/2002001000KUGdesignX13.3.13.10002000120/160/2001001500KUGdesignX13.3.14.21002500160/2001001500KUGdesignX13.3.15.21002500160/2002001500KUGdesignX13.4.16.10002000120100/2003000KUGdesignX13.4.17.14003000160/200100/2003000KUGdesignX13.2.18.600200090/120/160/2001001000KUGdesignX23.2.19.21002500160/2001001000KUGdesignX23.2.20.21002500160/2002001000KUGdesignX23.3.21.600200090/120/160/2001001500KUGdesignX23.3.22.21002500160/2001001500KUGdesignX23.3.23.21002500160/2002001500KUGdesignX23.4.24.10002000120100/2003000KUGdesignX23.4.25.14003000160/200100/2003000KUGdesignX23.2.26.900200090/120100/2001000KUGdesignX23.3.27.900200090/120100/2001500KUGdesignX23.2.11Designmax.webtensionVersionnumber1=MiniSF2=linkarmdesign3=KUGdesign1=400N2=1000N3=1500N4=3000NDifferencebetweenKUGandLinkarmDesignKUGDesignSFwithSupportstypeofactuator:linearmovementLinkarmDesignSFwithballbearings,hardenedrailsandlinkarmstypeofactuator:curvedmovement4.3.3.6SFapplicationpicturesSFapplicationpictures34.3.3.7Importantaspectsforapplication:1.ComparedwithDF-applications:-FrictionbetweenwebandrollersmustbehigherBSTstandard:2ndrollercoveredwithrubbercorktape(RCT)-Smallspaceformountingofframenecessary-Longenteringspannecessary-Worsestressdi