刮板输送机刮板间距的优化分析外文文献翻译中英文翻译.docx

刮板输送机刮板间距的优化分析外文文献翻译中英文翻译.docx

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刮板输送机刮板间距的优化分析外文文献翻译中英文翻译

英文原文

OptimizationAnalysisOfscraperSpacingOfScraperConveyer

Abstract

ThesizeofscraperspacingaffectstheefficiencyofthescraperconveyertransportationTherefore,itisnecessarytodeterminethescraperspacingreasonably.Inthispaper,arathercomprehensiveequationofscraperthrustingforceisobtainedbytheanalysisoftheprocessunderstresswhenthescrapermovesthematerialintheloadsideofthescraperconveyerandtheconsiderationofthefrictionforcethatbothsidesofthematerialtriangularprismbodyinthescraperget.Afterwards,theformulathatdescribesthescraperspacingisdeducedandthefactorswhichaffectthescraperspacingareanalyzed.Andtherelationshipsbetweenthescraperspacingandboththescraperchainandmaterialmovementresistanceintheloadsideandthechainmovementresistanceinthenon-loadsideofthescraperconveyerareanalyzed.Thentheoptimizationofscraperspacingisfulfilledwhichminimizestheresistanceofoperation.

KeywordsScraperspacing;Loadside;Triangularprismbody.

1Introduction

Thescraperconveyeristhekeyequipmentofthefullmeclhanizationworkingsurface.Duetothedevelopmentoftheequipmentmanufacturetechnology,theworkingsurfacescraperconveyerisrequiredtohavehighefficiencyoutput,hightransportcapacity,longertransportationdistance,andhigherreliability.Butthescraperspacingcanaffecttheefficiencyofentiretransportationprocess.Sincethescraperconveyermovementworkingconditionisbad,ifscraperspacingisoversized,thechainlinkstretchingmaycausethecenterchainlinkinthestraketostretchandtoskid,whichleadstothestretchingofthenextscraperandtheunloadingcoalboardtohavethechainstopped,orevenbrokendown.Therefore,todetermineareasonablescraperspacingisimportantundertheconsiderationofimprovingthetransportationefficiencyandthepreventionofoccurringaccidentofchainbroken.

Theformerresearchonthescraperspacinglacksthesystematicalandtheoreticalanalysis.Manyfactorsareneglectedduringthedeductionofthescraperspacingequation,especiallytheprocessofconveyerscraperpushingthematerial.Theinfluenceofthefrictionforcebornebythematerialtriangularprismbodybetweenboththescrapersidesissignificantandcannotbeneglected.Dueto.thisfactor,thestressanalysisofpushingthematerialtothescraperiscarriedoutagain.Undertheconditionthatthematerialbetweentwoscrapersisstable,thescraperspacingformulaofthemaximumvalueofthescraperspacingisobtained.Andafterwards,theinfluencefactorisanalyzed,andscraperspacingisoptimized.

Fig.1Freebodyschematicdiagramoftriangularprismbody

2Stressanalysisofthescraperpushingthematerial

Onthescraperconveyerloadcarryingside,conveyerscrapermoves,pushingmaterialtomove,thusrealizingmaterialdelivery.Frictionforcesexistbetweenthematerialstriangularprismbodyandthescraperonitssides.

Inthestressanalysisdiagramthatshowsthescraperburiedinthematerialpushesthematerialtomove,hrepresentsthescraperheight,Fstandsforthethrust,andastandsfortheconveyerlongitudinalarrangementinclinationangle.Accordingtobulkmechanicsprinciple,whenthethrustforcesofpushingboardABsurpassthemarginalvalue,thetheoreticalbalanceofbulkmaterialinfrontofthepushingboardwillbedestroyed.Then,relativeskidwilloccurinsidethematerial,triangularprismbodyABCwillbepushedforwardasawhole,triangularprismbodyACDwillslipalonglineAC,lineCDandlineAD,andtriangularprismbodyACDwillbeincreasinglyelevatedintheprocessofslipping,thusproducinganewstablestate.0and0,areanglesoffrictionthatcanmaintainthebalanceofbulkmaterial.Nextwewillstudytherelationshipbetween0,0qandF.SupposethewidthofthescraperABisB,schematicdiagramsfortriangularprismbodyABCandACDaredrawnrespectively,eacharrissurfacebearspositivepressureNandthefrictionforceN,（correspondingsignsareshowninFig.1）.BecausetheworkinglineoffrictionforceonthefourtrianglesurfaceADC,ADC,ABCandABCparallelwiththatofthrustforceFandpositivepressureoneacharrissurfaceinZaxisdirectionparallelwitheachother,wedrawdiagramoftriangularprismbodyasinFig.2.

Fig.2Freebodydiagramoftriangularprismbody

FromforcebalanceoftriangularprismbodyACDwiththelengthofB,wededuce:

}

（1）

FromforcebalanceoftriangularprismbodyABCwiththelengthofB,wededuce：

}

（2）

representsthetotalfrictionforceofthetwosurfaceoftriangularprismbody，and

.Iftheheightofmaterialisthesame，

（3）

Inthisformula，

referstodensityofbulkmaterial，

；

referstolateralcoefficientofbulkmaterial；greferstoaccelerationofgravity，

；

，

referstofrictioncoefficientinmaterials；

；

referstofrictioncoefficientbetweencoalandsteel；

，

。

Thefollowinganalysisisthesamewithabove：

（4）

（5）

（6）

（7）

Introducingmiddlevariableorconstantequation：

（8）

（9）

（10）

（11）

（12）

（13）

（14）

（15）

（16）

（17）

（18）

（19）

}（20）

Theaboveequationcandeduce：

（21）

whichistomaintainthebalanceofbulkmaterialis：

；here

，

：

canbededucedfrom

}candeducethevalueof

，

.Bringthemtoequation（5），thenwencanextract

。

SupposethatthescraperspacingisL,toensurethestabilityofmaterialbetweenthetwoscrapers,thethrustforceofthescrapershouldbemaintainedlowerthan

So:

（22）

Accordingtotheaboveformula,Let'sanalyzetherelationshipbetweena,handH.

FromFig.3,whenhis0.114mandotherparametersremainunchanged,withtheaccretionofH,Lmaxtendstohorizontal.Whenais

;when

is

;when

is

FromFig.4,whenais

andotherparametersremainunchanged,withtheaccretionofH,

tendstohorizontal.Whenhis0.114m,

;whenhis0.090,

;whenhis0.150,

.

Fig.3Variationof

withthatof

andH

Fig.4VariationofwiththatofandH

3Analysisandcalculationofchainoperationresistanceonloadedandnon-loadedside

AnalysisandCalculationmainlycover:

scraperchainandmaterialsmoving（underthenon-stablecondition）resistanceonloadedside,chainmovingresistance（consideringtheconditionofmaterialsmoveintonon-loadedstrake）onnon-loadedside

3.1Chainmovingresistanceonloadedsideundernon-stablecondition

Theconditionunderwhichthestabilityofmaterialismaintainedandthematerialcanrunwithscraperchainatthesamepaceis:

.If

thetwowillbeatthecriticalstate.If

thematerialscannotrunwiththescraperchainatthesamepaceandthescraperwillrunthroughthematerials.Atthisstage,theresistancebornebythescraperis:

.Undernon-stableworkingcondition,wecancalculatethemovingresistanceonloadedsideatunitlength:

Atstablerunningstate.

（23）

Intheabove.equation:

Wstandsformovingresistanceatunitlength.N;

.

standsfortheweightofscrapermassatunitlengthandmaterialsmass,kg/m.

standsforquantumfrictioncoefficient.Èstandsforconveyerangelwithupmovingpositiveanddownmovingnegative.

standforfrictioncoefficientofsteelagainststeel,coalagainststeelandcoalagainstcoalrespectively.

standsfordensityofbulkmaterials-kg/m.

standsforsidestresscoefficient.Hstandsformaterialheight.hstandsforscraperheight.

Undernon-stablecondition:

（24）

Intheaboveequation:

standsforscraperspace,B.bstandsforupside（ordownside）areaofthescraper,m;Bstandsforscraperlength,m;bstandsforscraperwidth,m.Othersymbolsarethesameasthoseofthepreviousparts.

3.2Chainoperationresistanceonloadedside

Ifthereisnomaterialinthestrakeonnon-loadedside,itissimpletocalculateitsresistance.Thatis,

.Butduringthemovingprocessofthescraperchain,thematerialisoftencarriedintothereturnside.Especially,becausethechainonthereturnsidemovesinclosedstraketrunk,thesideunloadscraperconveyermaymoveintwoways,asshowninFig.5

InFig.5（a）,middleboardisnotpressedbymaterials,andinthisconditionWis:

（9）

Fig.5Workingconditionwithmaterialinreturnsidenaterialweightatuntillength-kg/m.

Fig.6Pressuredistributingschematicdrawingformatervials

Fig.5（b）showsthestatethatmiddleboardispressedbymaterials.StressdistributionisshowninFig.6.Accordingtobulkmechanicstheory,supposeeverystrakesweightis

kgandunitweightofthechainis

kg/m;then

Fig.7Workingresistancepermeteronthescrapercoveyor

（25）

Suppose

then

.Fig.7demonstratestworelationshipcurvesofscraperchainoperationresistanceandscraperspace.FromFig.7,wecanseethatwhen

theoperationresistancechangesdramatically.Andwhentheoperationresistancebecomesbigger,thewholetransmissionefficiencybecomesloweraccordingly.Sowhentheoperationresistanceisminimum,namelywhenL,1m,operationresistanceatunitlengthistheleastandefficiencyisthehighest.Thisisoptimizedscraperspace.

Conclusions

（1） We have analyzed the stressprocessin whichtheload-sidescraperofthescraperconveyerpushesthematerialtomove,takingintoconsiderationthefrictionforcewhichisborneontwosidesoftheblock,obtainedamorecomprehensivescraperthrustforceequation,anddeducedaformulaforthemaximumscraperspacing;

（2）Wehaveanalyzedthealteringtendencyof

scraperspacing,takingaccountoftheinfluenceoftheconveyerlongitudinalarrangementinclinationangle,thescraperheightandthemateria