ROTATINGSUPPORTINGARMS.docx

ROTATINGSUPPORTINGARMS.docx

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ROTATINGSUPPORTINGARMS

LBTPROJECT

TECHNICALSPECIFICATION

ROTATINGSUPPORTINGARMS

WITHTHEFABRICRETRACTABLECOVER

OFTHEPRIMARYMIRRORS

1SUPPLYDESCRIPTION.4

1.1RotatingArmwithDrivingsystem4

1.2RetractableFabricCover4

1.3Supplyingconsistence5

2AMBIENTWORKINGCONDITIONS5

3TECHNICALDATAANDDRAWINGS6

3.1RotatingArm–Seedwg.727a0086

3.2Retractablecover–Seedwg.727a0096

3.3Electriccabinetsandcontrol6

4LISTOFDRAWINGS8

4.1Listofassemblydrawings8

4.2Listofsubassemblydrawings8

5SUPPLYRULES.10

5.1Planning10

5.2Procedure10

5.3Surfaceprotectionandpainting10

5.4DeliveryF.O.B.10

6ACCEPTANCETESTS11

INTRODUCTION

ThedustandanytypeofdirtydepositingonthePrimaryMirrorsurface,arecauseofdangerouslossofefficiencyoftheTelescope,somuchtosuggest,alsoifwithaincreaseofcostandcomplication,toincludeinthedesignaneffectivecoverprotectionfortheM1.

Thepresentspecificationconcernsthetwocoversfortheprimarymirrorsofthetelescope,onefortherightsideandtheotherfortheleftone.Eachofthemhasamainrotatingarmtogetitinpositionandadeployableumbrella（cover）drivenbydifferentcontrol.Ascanbeunderstoodfromtheencloseddrawings,eachunitisdescribedastwoseparatecomponents.Infact,therotatingarmwithitsdrivesystempresentsconstructionproblemsquitedifferentfromtheretractablefabriccoverwithitsguidinganddrivingsystem.ThecontractfortheentiresupplywillbegiventoasingleCompany.

Theprincipleandtheconstructiontechnologyofthefabricretractablecoverhasbeenprovedandpositivelytestedduring1995bytheArcetriObservatoryona2mdiameterscaledprototype.

Thedimensionsreportedintherelateddrawingsmustbestrictlyrespectedbecauseoftheinterfacingtelescopestructuresandtheopticalobstructions.Ontheotherhand,theconstructiondetailsforthecoveranditsguidingsystemaresubjecttoalternativeproposalsaccordingtotheexperienceandsuggestionscomingfromtheManufacturers.

1SUPPLYDESCRIPTION.

1.1RotatingArmwithDrivingsystem

ThisfirstsubassemblyoftheM1CoverconsistsinafixedcylindricalmasttobeboltedontheELstructure,supportingboththebearingandthescrewjackforthe90degreerotationoftheswingarm-seedwg.727a009and727a008.

Althoughonthedwg727a011alsothedrivingunitandthechainforopeningandclosingthecoverarerepresented,weincludeinthemechanicalsupplydescriptiononlythemachinedcircularsectorsupportingtheclosedbellow,whileallthedetailsdescribedintheintroductionareincludedinthecoveritem.

Thetwoarmshingedinthecenterhavingthefunctionofmobileanchoringofthebellowsandsupportofthedrivingunitforopeningandclosingit,arepartoftheretractablecoveritemaswell.

AnimportantinterfaceisontheELmainstructure,consistinginthesupplyofatemplatecompleteoftheboringsforthefixationofthecylindricalcolumnrepresentedonthedwg.727a013.

1.2RetractableFabricCover

TocompletetheM1Coverunit-seetheassemblydwg.727a007-hastobeaddedwhatwehavecalled“fabriccover”,suchitemincludesalargeseriesofmechanicaldetails,startingfromthechaintobefixedaroundtheexternalcellwallandthetwodrivingunitswiththerelevantsupportingarmhingedatthecenterpin.

Thecoveritselfisforeseenbeingmadeofaseriesofstainlesssteelthinbladesconnectedeachotherwithhingesallalongtheirlength.Thefirstandthelastbladeareconnectedtothefixedanddrivingstructures;particularattentionmustbedevotedtothedetailsofsupportingandguidingthecoverbladesaroundtheM1cellupperflange,tothebladesthemselvessupportingthehorizontalandfrontfabricconnections.Asfarasthesupportsandconnectionsaroundthecenterpinareconcerned,asufficientnumberofhingesconnecttoabushrotatingaroundthecenterpinitself.SuchdesignreportedintheencloseddrawingscanberevisedalsoaccordingtotheManufacturerexperience,consideringthatwehaverepresentedtheresultsofthefirst2mdiametertestbenchimplementation.

1.3Supplyingconsistence

Moreindetail,thesupplyconsistspurchasingallthecommercialcomponentsbeingpartoftherotationmechanisms,themotorsandthelimitswitches;alsothefinalcablingandtheelectricalcontrolunitsarepartofthesupply.Thenecessaryequipmentfortheacceptancetestsshallbeprovidedbythesuppliertoo.

EveryrotatingM1Covershallbefullypreassembledincludingtherotationmechanismsandlocatedfortheacceptancefunctionaltestsinhorizontalposition（telescopezenithpointing）andatdifferentelevationanglestowardtheverticalposition.

2AMBIENTWORKINGCONDITIONS

TheM1Coversarerequiredtogranttheperformanceinthefollowingenvironmentconditions:

-Operatingtemperature-20÷+25°C

-Operatingpressure500÷600Torr

-Operatinghumidity5÷95%

-Storagetemperature-30÷+50°C

-Storagepressure500÷700Torr

-Storagehumidity5÷80%

-Altitude3,250ma.s.l.

-LifetimeoftheTelescopeexceed25years

3TECHNICALDATAANDDRAWINGS

3.1RotatingArm–Seedwg.727a008

∙Max.speedofthenutonthescrew0,45m/min

∙Displacementofthenutfor90ºarmrotation0,6m

∙Timedemandedforpositioningthearmmax2min

∙Drivingmotorforeachofthetwosectorsofthebellow:

4KW/4poleswithdiskbrake480V/60Hz

∙ScrewJack–UNIMECTYPETPRC559–1/30–withscrewandnutonre-circulatingballsandelasticprotectionofthescrew.

oEstimatedweightofthefixedmastsupportingthedrivingJack293kg

oIncludingthemechanicaldetails400kg

oEstimatedweightoftherotatingarmsupportingthebellow

∙withtheauxiliarystructure710kg

oEstimatedweightofthecantileverarmsupportingthedrivingarmsofthebellow~540kg

3.2Retractablecover–Seedwg.727a009

∙Drivingunits:

oN°2MotorsWACORS500BT–2NmCont.torque,withbrakeandtachogenerator

oN°2GearboxPLC120GSC-Ratio1:

120

oN°2Chainssprockets13teethforchain1inchpitch

oChainfixedaroundthecellona9400-1“pitch

oDrivingsprocketvelocity2500/120=20,8rpm

oTimerequestedforopening/closingthecover2.5’

∙Materialusedforthe2mcovertest–KevlarPreox270g/m2-ProducedbytheFrenchCompanyDICKSONPTL-

3.3Electriccabinetsandcontrol

Accordingtothemaindataofthemotorslistedaboveandthelimitswitcheslogic,itisrequiredasimpleanalogcommandcontrolformovingtheRotatingArmandtheRetractableCover.Indetailswe’llhave:

∙directpowersupplyingforthemotorsaccordingtotherequiredvoltage,

∙safetydevicesforthemotors（overcurrent,thermalswitches）,

∙onepushbuttoncommand,foreachdirection,movingtherotatingarmtotherequestedposition（workingposition/restingposition）,

∙onepushbuttoncommand,foreachdirection,movingtheretractablecoverforeachdirection（open/close）,

∙bothpositionsofthetwoarmswillbemonitoredbyon/offlights,

∙thelimitswitchescontrolthepowertothemotorsandthelightsstatus.

4

LISTOFDRAWINGS

4.1Listofassemblydrawings

Dwg.727a007-M1cover-Generalassembly

Dwg.727a008-M1cover–Rotatingarmwithdrivingsystem

Dwg.727a009-M1cover–Armscoverwithguidinganddrivingsystem

Dwg.727a011-M1cover–Retractablefabriccoverwithcenteranchoring

4.2Listofsubassemblydrawings

Dwg.727a012-Driveunitassembly

Dwg.727a013-Fixedcylindricalcolumn

Dwg.727a014-Screwjacksupport

Dwg.727a015-Rotatingbox

Dwg.727a016-Sectorforchainjoint

Dwg.727a017-Rotatingarm

Dwg.727a018-Circularsector

Dwg.727a019-Spacer

Dwg.727a020-Adjustment

Dwg.727a021-Crossbeam

Dwg.727a022-Bearingsupport

Dwg.727a023-Bearingcup

Dwg.727a024-Crossbeam

Dwg.727a025-Pin

Dwg.727a026-Washer

Dwg.727a027-Bearingsupport

Dwg.727a028-ScrewjackUNIMECTPR559

Dwg.727a029-Sector

Dwg.727a030-Fixedsector

Dwg.727a031-Druggingsector

Dwg.727a032-Anchoringplate

Dwg.727a033-Upperanchoringsector

Dwg.727a034-Loweranchoringsector

Dwg.727a035-Spacertube

Dwg.727a036-ScrewM8x45

Dwg.727a037-Spacer

Dwg.727a038-Hinge

Dwg.727a039-Anchoringtubeassembly

Dwg.727a040-Anchoringtube

Dwg.727a041-Anchoringtube

Dwg.727a042-JointM8rightthread

Dwg.727a043-JointM8R/Lthread

Dwg.727a044-Bronzering

Dwg.727a045-Anchoringtieassembly

Dwg.727a046-Specialnut

Dwg.727a047-Specialwasher

Dwg.727a048-Arms

Dwg.727a049-Supportfordriveunit

Dwg.727a050-Chainsupport

Dwg.727a051-Protectioncover

Dwg.727a052-Bushingselflocking

Dwg.727a053-Spacers

Dwg.727a054-Rollerchainsupport

Dwg.727a055-Safetywasher

Dwg.727a056-Pin

Dwg.727a057-Washer

Dwg.727a058-Bushingselflocking

Dwg.727a059-Pin

Dwg.727a060-Tierod

Dwg.727a061-Washer

Dwg.727a062-Washer

Dwg.727a063-Couplingflange

Dwg.727a064-Coupling

Dwg.727a065-Shaft

Dwg.727a066-Bearingsupport

Dwg.727a067-Bearingcover

Dwg.727a068-Spacers

Dwg.727a069-Spacers

Dwg.727a070-Chainjoint

Dwg.727a071-Sprocket

Dwg.727a072-Simplexchain

5SUPPLYRULES.

TheconstructionoftheM1covermustcomplythefollowingrules:

5.1Planning

TheManufacturershallsubmittotheP.O.adetailedplanningofconstruction,pointingouttheintermediatetestsandverificationsforeseenbyitsQualityControlService.

5.2Procedure

Preparationofallproceduresandmethodstoexecutethecriticaloperationsofthemanufacturing.

5.3Surfaceprotec