外文翻译---振动筛地选择.doc

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1、辽宁科技大学本科生毕业设计第1页ScreeningVibratingscreensPrinciples--Vibratingscreenssavespaceandweightandoperateonlittlepowerbecausethescreeningsurfacemaybeactuatedbyvibrating,gyratingorpulsatingmovementofsmallamplitude,butatfrequenciesthatnormallyexceed3,000/min.SelectionofProperVibrationSereen--Besurethescr

2、eensupplierknowsalldetailsoftheapplication.Thecentrifugalforcefactor,orcombinationoffrequencyofvibration(speed)andamplitude(throw),mayaffectperformanceofanyvibratingscreen.Also,acorrectcombinationofslopeanddirectionofmechanismrotationisvitalforinclinedscreens.Usually,thelargertheopening,thegrea

3、tertheamplitudeneededforascreen.Ifthethrowistoosmall,thematerialmayclogorwedgeintheopenings.Increasingthethrowbeyondwhatisrequiredtopreventblindingorpluggingdoesnotnecessarilyincreasethelifeofthebearingsandreducescreeningefficiency.Increasedrateoftravelpermitsmoretonnagetobepassedoverthescreenp

4、erunitoftime.Foragiventonnage,afasterrateoftravelresultsinathinnerbedofmaterialandhighscreeningefficiency.Maximumslopeisreachedwhenthematerialtravelstoofastforthefinestopenetratetheribbonofmaterialandreachtheaperturesinthescreencloth.Atthispointanexcessiveamountoffinematerialpassesoverthescreen

5、withtheoversize,resultinginpoorefficiency.Whenanexistingscreenistobeusedforanapplicationotherthanthatforwhichitwasoriginallyintended,checkwiththeSuppliertoseeifanyoftheoperatingcharacteristicsneedmodificationandifthethescreenisstructurallysuitableforthenewapplication.Theoperatorcangetthecorrect

6、vibratingscreenbyprovidingthesupplierwiththefollowinginformation:·Maximumtonsperhourtobescreened,includinganycirculatingloadoranysurgesinthefeedrate.·Acompletesizeconsistorsieveanalysisofthematerialor,ifavailable,anestimatedanalysis.·Typeofmaterialandweightpercubicfootinbrokenstate.辽宁科技大学本科生毕业设

7、计第2页·Separationsdesiredoneachdeck.·Surfacemoisturecarriedbythematerialifscreeningistobedryoramountofwaterwithfeedifwet.·Specialoperatingrequirementsorconditionssuchastemperature,abrasiveness,corrosivenessorotherphysicalcharacteris