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Word下载.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Word下载.docx
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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
;
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.È
standsforconveyerangelwithupmovingpositiveanddownmovingnegative.
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
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