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1、ABSTRACT1.owreductionratiosandhighwearratesarethetwocharacteristicsntostcommonhassociatedwithconventiona1.ro1.1.crushers.Becauseofthis,ro1.1.CrushersarenotoftenconsideredJoruseinminera1.processingcircuits,attdmanyoftheiradvantagesarebeing1.arge1.yover1.ooked.Thispaperdescribesanove1.ro1.1.crushertha
2、thasbeendeve1.opediptordertoaddresstheseissues.Re1.brredtoastheNCRC(Non-Cy1.indrica1.Ro1.1.Crusher),thenewcrusherincorporatestworo1.1.scomprisedqfana1.ternatingarrangementofp1.atteattdconvexorconcavesuwes.Theseuniquero1.1.prqfi1.esimprovetheang1.eqfnip,enab1.ingtheNCRCtoachievehigherreductionratiost
3、hanconventiona1.ro1.1.crushers.Testswithamode1.prototypehaveindicatedthareve1.1.fi)rveryhardores,reductionratiosexceeding10:1canbeattained.Inaddition,sincethecomminutionprocessintheNCRCcombinestheactionsofro1.1.arMjawcrushersthereisapossibi1.iOthatthenewprofi1.esmay1.eadtoreducedro1.1.wearrates.2001
4、E1.sevierScience1.td.A1.1.rightsreserved.Keywords:crushingINTRODUCTIONConventiona1.ro1.1.crusherssufferfromsevera1.disadvantagesthathave1.edtotheir1.ackofpopu1.arityinminera1.processingapp1.ications.Inparticu1.ar,their1.owreductionratios(typica1.1.y1.imitedtoabout3:1)andhighwearratesmakethemunattrac
5、tivewhencomparedtoothertypesofcomminutionequipment,suchasconecrushers.Thereare,however,somecharacteristicsofro1.1.crushersthatareverydesirab1.efromaminera1.processingpointofview.There1.ative1.yconstantoperatinggapinaro1.1.crushergivesgoodcontro1.overproductsize.Theuseofspring-1.oadedro1.1.smakethese
6、machinesto1.eranttoUncrushab1.emateria1.(suchastrampmeta1.).Inaddition,ro1.1.crushersworkbydrawingmateria1.intothecompressionregionbetweenthero1.1.sanddonotre1.yongravitationa1.feeci-1.ikeconeandjawcrushers.Thisgeneratesacontinuouscrushingcyc1.e,whichyie1.dshighthroughputratesanda1.somakesthecrusher
7、capab1.eofprocessingwetandstickyore.TheNCRCisanove1.ro1.1.crusherthathasbeendeve1.opedattheUniversityofWesternAustra1.iainordertoaddresssomeoftheprob1.emsassociatedwithconventiona1.ro1.1.crushers.Thenewcrusherincorporatestworo1.1.scomprisedofana1.ternatingarrangementofp1.aneandconvexorconcavesurface
8、s.Theseuniquero1.1.profi1.esimprovetheang1.eofnip,enab1.ingtheNCRCtoachievehigherreductionratiosthanconventiona1.ro1.1.crushers.Pre1.iminarytestswithamode1.prototypehaveindicatedthat,evenforveryhardoics,reductionratiosexceeding10:1canbeattained(VeIIe1.riandWeedon,2000).Theseinitia1.findingswereobtai
9、nedforsing1.epartic1.efeed,wherethereisnosignificantinteractionbetweenpartic1.esduringcomminution.Thecurrentworkextendstheexistingresu1.tsbvexamininginu1.ti-partic1.ecomminutionintheNCRC.Ita1.so1.ooksatvariousotherfactorsthatinf1.uencetheper1.i-manceoftheNCRCandexp1.orestheeffectivenessofusingtheNCR
10、Cfortheprocessingofmi1.1.scats.PRINCIP1.EOFOPERATIONTheang1.eofnipisoneofthemain1.ectorseffectingtheperformanceofaro1.1.crusher.Sma1.1.ernipang1.esarebeneficia1.sincetheyincreaset1.e1.ike1.ihoodofpar1.ictesbeinggrabbedandcrushedbyIhero1.1.s.Foragivenfeedsizeandro1.1.gap,thenipang1.einaconventiona1.r
11、tH1.crusheris1.imitedbythesizeofthero1.1.s.TheNCRCattemptstoovercomethis1.imitationthroughtheuseofprofi1.edro1.1.s,whichimprovetheang1.eofnipatvariouspointsduringonecyc1.e(orrevo1.ution)ofthero1.1.s.Inadditiontothenipang1.e,anumberofotherfactorsinc1.udingvariationmro1.1.gapandmodeofCommmutionwerecon
12、sideredwhense1.ectingI1.1.ero1.1.profi1.es.Thefina1.shapesoftheNCRCro1.1.sareshowninFigureI.Oneofthero1.1.sconsistsisana1.ternatingarrangementofp1.aneandconvexsurfaces,whi1.etheotherisformedfromana1.ternatingarrangementofphmeandconcavesur1.accs.Theshapeofthero1.1.sontheNCRCresu1.tinsevera1.uniquecha
13、racteristics.Ti1.emostimportantisthat,1.k)ragivenpartic1.esizeandro1.1.gap,thenipang1.egeneratedmtheNCRCwi1.1.notremainconstantasthero1.1.srotate.Therewi1.1.betimeswhenthenipang1.eismuch1.owerthanitwou1.dbeforthesamesizedcy1.indrica1.ro1.1.sandtimeswhenitwi1.1.bemuchhigher.Theactua1.variationinnipan
14、g1.eovera60degreero1.1.rotationisi1.1.ustratedinFigure2,whicha1.soshowsthenipang1.egeneratedundersimi1.arconditionsmacy1.indrica1.ro1.1.crusherofcomparab1.esize.Thesenipang1.eswereca1.cu1.atedfora25ramdiametercircu1.arpartic1.ebetweenro1.1.ofapproximate1.y200ramdiametersetataImmminimumgap.Thisexamp1
15、.ecanbeusedtoi1.1.ustratethepotentia1.advantageofusingnon-cy1.indrica1.ro1.1.s.Inorderforapartic1.etobegripped,theang1.eofnipshou1.dnorma1.1.ynotexceed25o.Thus,thecy1.indrica1.ro1.1.crusherwou1.dnevernipthispartic1.e,sincetheactua1.nipang1.eremainsconstantatapproximate1.y52o.Thenipang1.egeneratedbyt
16、heNCRC,however,tid1.sbe1.ow25oonceasthero1.1.srotateby(0degrees.Thismeansthatthenon-cy1.indrica1.ro1.1.shaveapossibi1.ityofnippingthepartic1.e6timesduringonero1.1.rewHution.EXPERIMENTA1.PROCEDUREThe1.aboratorysca1.eprototypeoftheNCRC(Figure3)consistsoftworo1.1.units,eachcomprisingamotor,gearboxandprofi1.edro1.1.Bothunitsaremountedon1.inearbearings,ponentofforcewhi1.eenab1.inghorizonta1.motion.Onero1.1.unitishorizonta1.1.yfixedwhi
