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1、饲料加工中的筛分技术（Screeningtechniqueinfeedprocessing）Screeningtechniqueinfeedprocessing5-18ScreeningtechniqueinfeedprocessingKeywords:mechanicalscreening,screeningequipment,gradingscreen,bucketelevator,vibrationclassificationscreenFinishingrelease:highservicescreenmachin
2、edate:01-01Mechanicalscreeningisthemainscreeningtechnologyusedinfeedmillsatpresent.Themaincomponentsofthescreeningequipmentarescreensurfaces,andnowwidelyusedaresteelplatepunchingscreensandwovensieves.Theapplicationofscreeningtechnologyinfeedprocessingfocusedontwoa
3、spects,oneistocleanuptheimpurityinrawmaterials,twoistherawmaterialorproductaccordingtoparticlesizegrading,gradingofpowderimpuritiesimpurityinrawmaterialcleaning,crushing,gradingmaterialbeforecleaning,granulationgranulationproducts.Intheprocessofprocessing,theeffec
4、tofscreeningisveryimportanttothequalityandyieldoffeedproducts.1screeningefficiencyanditsinfluencingfactors1.1screeningefficiencyThescreeningefficiencyincludestwoaspects:theretentionratioofthescreenmaterial(expectedscreenmaterial)andtheproportionofthescreenretained
5、bythescreenmaterial(desiredscreening).Thesetwoindexesaffectthecleaningeffectofimpuritiesandthelossofnetrawmaterialsinthecleaningoperation.Theyaffecttheparticlesizeandyieldoftheproductsintheclassificationoperation,andaffectthereliabilityoftheclassificationresultsin
6、thetest.Theformeriscalledscreeningrate,andthelatteriscallederrorscreeningrate,whichisexpressedasaformula:ETA1=ETA2=Intheformula,ETA1-sievenetrate,%;ETA2-errorscreeningrate,%;W1-expectedovertailssieveretention,kg/h;W2-expectedovertailstotalkg/h;W3-expectedundersize
7、sieveretention,kg/hW4isexpectedtoscreen;thetotalamountofmaterial,kg/h.Theabovetwoindicatorsfortheevaluationofcleaningsieveefficiency,whentheobjectsonthescreenasanimpurity,ETA1isequivalenttotheremovalrateis2,equivalenttoanetlossrateofrawmaterials.1.2factorsaffectin
8、gscreeningeffectThediameterofthelargestmaterialthroughthesievecanbeestimatedbythelowermodel:D=D,cos,alpha,-e,sin,alphaInD,themaximumparticlediameter,ape
