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1、饲料加工中的筛分技术（Screeningtechnologyinfeedprocessing）Screeningtechnologyinfeedprocessing5-18ScreeningtechnologyinfeedprocessingLabelkeywords:mechanicalscreening,screeningequipment,gradingsieve,bucketelevator,vibratinggradingsieveFinishingrelease:highclothingscreeningmachinedate:01-01Mechanicalscreenin
2、gisthemainscreeningtechnologyusedinfeedmills.Themaincomponentofthescreeningequipmentisscreensurface.Atpresent,thesteelplatepiercingscreenandthewovensievearewidelyused.Theapplicationofscreeningtechnologyinfeedprocessingfocusedontwoaspects,oneistocleanuptheimpurityinrawmaterials,twoistherawmateria
3、lorproductaccordingtoparticlesizegrading,gradingofpowderimpuritiesimpurityinrawmaterialcleaning,crushing,gradingmaterialbeforecleaning,granulationgranulationproducts.Theeffectofscreeningintheprocessofprocessinghasasignificantimpactonthequalityandyieldoffeedproducts.1screeningefficiencyanditsinfl
4、uencingfactors1.1screeningefficiencyThescreeningefficiencyincludestwoaspects:theretentionratioofthesievematerial(theexpectedsievematerial)andtheproportionofthesieveretainedonthesievesurfacematerial(theexpectedscreenmaterial).Thesetwoindexesaffectthecleaningeffectofimpuritiesandthelossofnetrawmat
5、erialsinthecleaningoperation,affecttheparticlesizeandyieldoftheproductinthegradingoperation,andaffectthereliabilityoftheclassificationresultsinthedetection.Theformeriscalledsieverate,andthelatteriscallederrorscreeningrate,whichisexpressedasaformula:ETA1=ETA2=Intheformula,ETA1-sievenetrate,%;ETA2
6、-errorscreeningrate,%;W1-expectedovertailssieveretention,kg/h;W2-expectedovertailstotalkg/h;W3-expectedundersizesieveretention,kg/hW4isexpectedtoscreen;thetotalamountofmaterial,kg/h.Theabovetwoindicesareusedtoevaluatetheefficiencyofcleaningsieve,whentheobjectsonthescreenasanimpurity,ETA1isequiva
7、lenttotheremovalrateof2,isequivalenttothenetlossrateofrawmaterials.1.2factorsaffectingthescreeningeffectThediameterofthemaximummaterialparticlethroughthesieveholecanbeestimatedbythelowerform:D=Dcosalpha-esinalphaInD,themaxim
