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1、外文文獻(xiàn)及翻譯外文文獻(xiàn)及翻譯SteelCdBeltSpliceConstructionModernizingtheirspecificationsImprovingTheirEconomicsL.K.NdellUSASummaryBeltconveyersconstructedwithsteelcdtensilemembersaregenerallydesignedwithabreakingstrengthratingthatexcee

2、dstheoperatingloadby6.7times.ThismultipleratioisoftenreferredtoastheSafetyFact(SF).This6.7:1SFhasbeenchosenbybeltmanufacturersindustrialstardstorepresentthecriterionfstrengthwhichengineersmustfollowduringdesigndevelopmen

3、tThispaperwilldemonstratethattheirapproachdevelopedover30yearsagoisnotpracticaltoday.Itresultsinasignificanteconomicpenaltytotheowner.BeltspliceconstructionmaterialsmodemanalyticprocedurescanprovidesafeoperationusinganSF

4、ratiobelow6:1atbreakingstrengthratingsfromST1000NmmtoaboveST6000Nmm.Splicefatiguefailurecriteriastresslimitsofthecerubbercablearediscussed.Thismethodisusedtoresolvemodernsteelcdbeltsplicedesign.Theeconomicbenefitscanbesu

5、bstantialfnewreplacementbelt.1.IntroductionThispaperisanextensionoftheauths19911993papers[1][2]respectively.Furtherresearchisbeingconductedontheviscoelasticpowerequationthehyperelasticsplicemodelingmethodsfatiguemechanic

6、sofsteelcablerubber.Thesecriteriaothernotableinfluencesprovidethenecessaryrefinementstoguidethechangesinbeltsplicespecificationsconstructionmethods.Thesetoolscansupptthemineownersinterestinrankingtheperfmanceofbeltsrubbe

7、rpropertiesfitsdempower(viscoelasticity)beltwearresistance(toughness)truetempalcapacity(splicedesignbeltconstruction).Allbeltsarenotcreatedequal.Fieldinvestigationtogetherwithmoderntheyendlabatystudiesconfirm!firstlythat

8、theempiricalpowerequation[3][4]doesnotprovideareasonablelevelofaccuracy[5]secondlythebeltsstrengthcannotbedeterminedfromelementarytestingofcablebreakingstrengthrubberHblockstaticpulloutfces[2].Thesegreyareasofunderstingn

9、eedameaccurateapproachtofulfillthedemsplacedontheengineerftodayslargermecostlyconveyingsystems.a.Case1isdesignedwithconventionalfrictionfactsconventionalpublishedsplicemethods.b.Case2isdesignedwithaslightreductioninconve

10、ntionalmotionfactsnotedfsuperiinstallationalignmentmaintenanceChannarDesign.c.Case3isdesignedtonewpowerequationmethodsabeltspecificationconstructionfmulationcontrolledbythesplicingsystemChannarothermeasurementssince1989v

11、erifythepotential.3.ManufacturersRecommendationfSafetyFactsinSteelCdBeltsSomeoftheleadingsteelcdbeltmanufacturerswerepolledftheirassessmentonsupptofthereductionintheSF.Theircommentsaresummarizedhere:3.1BridgestoneCpation

12、BridgestoneCpationcompletedadetailedinvestigationoftheBeltSafetyFactin1982.Afiniteelementmodelwasdevelopedtostudythenonlinearrubberstrainfatiguebehavi.Extensivetestingwasmadeonthefatigueperfmanceofthebeltssteelcds.Theses

13、tudieswereproducedinresponsetoaninquiryfanST7000NmmclassbeltOurinvestigationshowedthatthisclassofbeltcouldbeconstructedwithaBeltSafetyFactof5.0:1insteadofthecommonlyused70:1.BridgestonehasinservicelowSafetyFactbeltwhichh

14、asbeeninoperationfmethan10years.Regularmonitingofitsperfmancehasprovidedunderstingthatthepracticeissound.WecontinuetodaythroughfurtherresearchtestingtoadvocateimprovedSafetyFactstokeeppacewithadvancementsbeingdevelopedin

15、materialsengineeringmethodsDynamicfatiguetestingofthebeltitssplicepatternasdefinedbyDIN22110arealsoanecessitywhenrecommendingnewclassesofbeltconstruction[6].acoursewemustbearinmindanyreductioninthesocalledSafetyFactmusta

16、lsobeaccomplishedwithfullunderstingofallengineeringissuesdesignstardswhichmustapply.TheSafetyFactisdependentonmanyelementsoutsidethecontrolofthemanufacturer.Whentheownerwishesasignificantcostsavingsiswillingtoparticipate

17、inproperoperationmaintenancethengreaterbenefitscanbeachieved.ASafetyFactcloserto4.0:1maybeoffered.Theconveybeltseconomicscanhavealargeimpactontheviabilityofminingprojects.TotheseendsBridgestoneisprovidingitsfullsupptrede

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