Foire aux Questions sur les Machines d’équilibrage dynamiques et Answers(C)

Q.Whatarethecriteriaforselectionofenddriven,beltdriven,self

conduit, verticalbalancingmachines ?

A.Inadynamicbalancingrequirement,theaccuracyofthe

componentandtheeaseofbalancingdecidethemosttechno

economicalsolutioninselectingthebalancingmachineanddrives.

Massproducedcomponentswhicharediskinshape, andsmallin

sizeareinvariablybalancedonaverticalmachinewithbuiltin

correctionequipments. Highprecisionjobsrequiringfinelevelsof

balanceliketurbines, turbocompresseurs, arebalancedonbeltdriven

machine.Componentslikefansandheavyrotorswhichneed

considerablepowerforaccelerationanddecelerationaredriven

throughuniversalshaftsonabalancingmachine. Veryhighspeed

componentslikeautomobileturbochargerswhereintheerror

inducedbydriveelementsarenotacceptablearebalancedby

usingtheirownreallifesimulatedpowersourceslikecompressed

air. Theadvantageofthebeltdrivearrangementoveruniversal

shaftdrivenmachineisthetimetofixtheadoptersonthe

componentissavedanderrorsduetoadoptersontheresidual

unbalanceareavoided.

Q.Whataretheunitsofunbalance ?

A.Theunitsofunbalancearetheproduct (Multiplication) du

permittedunbalanceweightattheradiusofcorrection.

Par exemple

XgramofunbalanceatYmillimeterradiusisdefinedasXYmmgof

déséquilibre. Basedonthepracticetheunitscanbein

Metergram

Ounceinches

Graminches

Millimetergram

Millimetermilligram

Ortheproductofalineardistanceunitandaweightunit.the

relationshipbetweenalltheunitsisstraightforwardandcanbe

transferredforoperationalconvenience

Q.Whatarethecriteriaforselectionofenddriven,beltdriven,self

conduit, verticalbalancingmachines ?

A.Inadynamicbalancingrequirement,theaccuracyofthe

componentandtheeaseofbalancingdecidethemosttechno

economicalsolutioninselectingthebalancingmachineanddrives.

Massproducedcomponentswhicharediskinshape, andsmallin

sizeareinvariablybalancedonaverticalmachinewithbuiltin

correctionequipments. Highprecisionjobsrequiringfinelevelsof

balanceliketurbines, turbocompresseurs, arebalancedonbeltdriven

machine.Componentslikefansandheavyrotorswhichneed

considerablepowerforaccelerationanddecelerationaredriven

throughuniversalshaftsonabalancingmachine. Veryhighspeed

componentslikeautomobileturbochargerswhereintheerror

inducedbydriveelementsarenotacceptablearebalancedby

usingtheirownreallifesimulatedpowersourceslikecompressed

air. Theadvantageofthebeltdrivearrangementoveruniversal

shaftdrivenmachineisthetimetofixtheadoptersonthe

componentissavedanderrorsduetoadoptersontheresidual

unbalanceareavoided.

Q.Wehavebalancedafanonthebalancingmachineandwhenwe

testonastaticbalancingstandweseeheavyspotinthefan ?

A.Inthepictureaboveadynamicbalancingmachinemeasuresthe

resultantofthethreeresultantunbalanceforcesnamelythestatic

composantS, andthecouplecomponent+ Cand-CLe

valuescanberecordedbyusingtheprogramtwoplanemeasuring

andstatic/couplemeasuringsections.

WhenusingamachineyoucompensateallunbalancesieS, + C,-C.

Butwhencheckonastaticbalancingstandthecoupleportionun

balancedonotgetcompensated,andonlySiscompensated.so

youhavethehighspotsettlingatthebottomonastaticbalancing

standforcomponentsbalancedonamachine. Inactualservice

conditionswhenthedynamiceffectofallthreeforcesareactingthe

fansbalancedonamachineforbothStaticandCouplewillbe

plus lisse.