Fibreprep SPM 600

FibreprepModelSPM600
01.4T8/2.5mm 7.7%openarea.,50-120TPD

With40HPMotor
316SS

 

TheSPMpressureScreenincludesacylindricalplatecontainedinapressurizedcase,arotatingfoilassembly,aunitizedbase,sheavesandbelts,motormountingbracketonsliderailsanda200hpdrivemotor.


Thepressurizedcaseisessentiallysflangedcylinderwithadomedtopclosure.Thestandardcasehasapressureratingof60psi(4bars).Thereare3connectionstothemainbodyofthecase.Theyarejoinedtothecasecylinder.Thelargerupperconnectionisforincomingstockwhilethesmallerconnection,nearthebottomisanoutletforrejects.Thelowerportionofthecaseisforcollectingacceptedstock(accepts)afteritpassesthroughthescreenplate.Theacceptsoutletconnection,inthedomeofthecase,bleedsentrappedairfromthepressurescreen.

 

ThedrivemotorismountedverticallyonanL-shapedmotorbasewhichmountsonasliderail.SmatchedsetofV-beltsconnectsthemotorandpressurescreen.

 

Incomingstocktobescreened,entersthecasethroughtheupperinletconnectionandisimmediatelyacceleratedbythefoilassemblysweepingaroundthescreen.Theresultantcentrifugalforcethrowsheavydensecontaminantsawayfromthescreenplateandagainstthesidesofthecasewheretheyareflushedoutthroughtherejectsoutlet.Stockflowisinward(centripetal)throughthescreenplate.Acceptedstockcollectedinthecentercompartmentflowsdownwardandouttheacceptsconnection.Duetotheactionofthefoilassembly,thetangentialvelocityacrossthesurfaceoftheplateexceedstheinwardcentripetalflowvelocitybyafactorofabout10.Thiscausesstocktoapproachthescreenplateatanextremelylowangleandsignificantlyreducestheeffectivesizeofthescreenplateopeningsand,therebyincreasesscreeningefficiency.

 

Rejectmaterialmigratesspirallydownwardthroughtheoutercompartmentandouttherejectsconnection.

 

Thescreenidessentiallyselfcleaningbecauseofthehydrodynamiccharacteristicsofthehydrofoil.Eachfoilgeneratedahighnegativepressurepulsethatnotonlybreaksupthefibermatformedovertheplate,butalsoliterallypullslodgedparticlesfromthescreenplateanddepositstheminthefastmovingtangentialflowaroundthescreen.Ifparticlesaredense,centrifugalforceslingsthemtotheouterwallwheretheyarecollectedattherejectsoutlet.

 

Theventatthetopofthehousingbleedsoffalowflowofstockand,withit,anyairthatmaybeentrainedintheinletstream.Somelightfloatingparticlesmaybecarriedoffwiththisstreamandshouldberejected,Theventmustbeopenduringstartupofthescreen,butmaybeclosedorthrottledduringoperationaftertheinitialairinthesystemhasbeenbledoff.

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