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1、DynamicsscreeningacteristicsofavibratingscreenwithvariableellipticaltraceHEXiaomeiLIUChushengSchoolofMechanicalElectricalEngineeringChinaUniversityofMiningscreeningprocesswithconstantbedthicknessdynamicmodelmotionacteris

2、ticscreeningacteristics1IntroductionScreeningoperationsareanimptantpartofcoalprocessing.Thevibratingscreenisoneofthemostextensivelyusedscreeningtools.Vibratingscreenssuchaslinearvibratingscreencircularvibratingscreenelli

3、pticalvibratingscreenhaveasimpletranslationalmotion.Themotionfollowsthesamepatheverywhereonthescreensothescreenhasconstanttransptvelocitythrowingindexwhichleadstolowscreeningefficiency.Augmentingthethrowingindextoimprove

4、breakstheexcitingmotsprocessingcapacitylowersthewking.Inthispaperwereptonthedesignofanewvibratingscreenwithvariablemotiontracesthatisbasedontheprincipleofscreeningprocesswithconstantbedthickness[3–4].Differentpartsofthev

5、ibratingscreentraversedifferentellipticaltracestheresultingmotionagreeswellwiththeidealmotion.Thusthescreenprocessingcapacityefficiencycanbothbeprocesswithconstantbedthickness.Thefeedendofthescreenhasabiggerthrowingindex

6、ahighermaterialdeliveryvelocitywhichmakesbulkmaterialquicklyperatecausesrapiddelaminating.Earlierlaminationofmaterialincreasestheprobabilityoffinegrainedmaterialpassingthroughthemesh.Thescreenhasanappropriatethrowinginde

7、xalittlehighermaterialdeliveryvelocityinitsdlepart.Thisisofbenefitfstabilizingfinegrainedmaterialsfperatingunifmlyalongthescreenlength.Alowerthrowingindexmaterialdeliveryvelocitynearthedisgeendcausesthematerialtostaylong

8、eronthescreenencouragesmecompleteperationofthemesh.Twomethodsarecurrentlyusedtoimprovescreeningefficiency[7–8].Thefirstistoaddmaterialtothescreenfrommultiplefeedpts.Thisistroublesomeinpracticaluseespeciallyintermsofcontr

9、ollingthedistributionofdifferentlygranulatedmaterials.Henceitisrarelyusedinpracticalproduction.Thesecondwayistoadoptnewscreeningequipmentlikefexampleaconstantthicknessscreen.Themotionofthenewscreensurfacecausesmaterialto

10、maintainthesameanincreasedthickness.Itachievesarathermeidealmotion.Themainproblemwiththeconstantthicknessscreenisthatitcoversabiggerareathatthestructureiscomplicatedhardtomaintain.Asimplestructurewithgoodscreeningefficie

11、ncyisstillanecessity.Wehavedesignedanewvibrationscreenwithavariableellipticaltracethatisbaseduponanidealscreenmotionfuseinrawcoalclassification.Thesizeofthevibratingscreenis3.6m7.5mthefeedgranularityis0to50mmtheclassific

12、ationgranularityis6mm.Ellipticallyvibratingscreenscombinethebasicadvantagesofbothcircularlinearvibratingscreens[9–10].Thelongaxisoftheellipsedeterminesmaterialdeliverytheshtaxisinfluencesmateriallooseningtobeexact.3Dynam

13、icsmodelanalysisofvibratingscreenwithvariableellipticaltraceWemadetheexcitingfcedeviatefromthecenterofgravitytochangethemotionpatternofthenewvibratingscreen.Thestiffnessmatrixofthevibrationisolationspringwasnotzeroundert

14、hesecircumstancesthevibratingsystemhadmultipledegreesoffreedom.Mintransversewaggingwasneglectedtosimplifytheresearch.Themotionwasconsideredtobealinearvibrationofarigidbeaminthelongitudinallysymmetricalplane.Ateachpointth

15、evibrationisacombinationofthetranslationofthecenterofgravitythescreenpitchingaboutthecenterofgravity.Previousstudiesneglectedtheinfluenceofelasticfcesinthehizontalverticaldirectionontheswingofthevibratingscreen[311].Anac

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