directional163
www.cc163.net 时间:2021-02-07 阅读:()
StudyofLackingPicksonShearerHelicalVaneonDrumLoadInfluenceLiXiaohuo1,a,YaoTianyu2,b,MuYongcheng3,c,HuYantao4,d1,2,3,4MechanicalEngineeringCollegeofLiaoningTechnicalUniversity,Fuxin123000,Chinaalixiaohuo@163.
com,byaotianyu85833@sina.
com,cmuyongcheng2006@sina.
com,dhuyantao1982@163.
comKeywords:Drumshearer;Helicalvane;Cuttingpick;Load;MatlabAbstract.
Inordertomasterloadmagnitudeadrumanditschangesunderlackingpickscondition,findouttheinfluenceondrumloadswhenlackingpicksonhelicalvanes,explorefailurereasonsofashearerdrum,amathematicalmodelofshearerdrumloadswasanalyzedandestablishedinthepaper,usingMatlabcomputeranalysisprogram,drumloadsandtheirchangesunderseveralconditionsweresimulatedwhenlackingpicksonhelicalvanes,andtheinfluencetoshearerdrumloadoflackingpicksondifferentpositionswasanalyzed.
Theresultsindicatethat,thecloserlackingpickpositiontotheseamexposedsurface,thesmallerdrumloadfluctuationiswhenexistingonelackingpickonhelicalvane;theloadfluctuationandpositionangleoftwolackingpicksonthedruminverselyproportionalwhenexistingtwolackingpicksonhelicalvane,whichisroughlyinaccordwiththeactualsituation.
IntroductionDuetoabadworkingenvironment,alackingpickphenomenonoftenhappensduringashearerworks,ashearerunderlackingpickconditionwillaffectdrumworkreliability,servicelife,cuttingperformanceandproductivity[1,2].
Researchforthedrumloadsandtheirchangeruleswhenashearernormalworkinghavealreadyexisted[3-5],butdidnotseethereportaboutloadsandinfluenceswhenlackingpicksonashearer.
Soitisimportanttofindoutdrumloadsandtheirinfluencesonashearerperformancewhenlackingpicksonashearer.
CalculationmethodofloadsonshearerdrumPickforcesondrum.
Theworkingprocessofshearerdrumisshownasfigure1.
Atanymoment,theloadsofithpick(positionAngleisγi)[3-5]areasfollowsFig.
1Forcedanalysisofpickonshearerdrum(1)Cutresistance0.
50.
1750.
31101000.
5cosizycotqjyddZAhtKKKKKKfkSdBhσθ++.
(1)(2)Tractionresistance0.
50.
1750.
31101000.
5cosizycotqjyddYAhtKKKKKKkSdBhσθ++.
(2)(3)Lateralresistance132[]iiChXZCCht=++.
(3)Where,Aiscoalseamaveragecuttingimpedance;h,tisrespectivelyaveragecuttingthicknessandaveragetransversaldistance;σyispickunidirectionalcompressivestrength;Kφ,Kc,Kot,Kqarerespectivelypickfrontinfluencecoefficient,pickarrangementinfluencecoefficient,minepressureinfluencecoefficient,ratiocoefficientoftractionresistanceandcuttingresistance.
Instantaneousdrumloads.
Asshowninfigure1,instantaneousdrumloadsarevectorsumofeachforcecuttingcoalandrock.
Anymomentj,threedirectionalloadsofadrum(directionofvertical''a',directionoftraction'b',axialdirectionofdrum'c')are1(sincos)pnajiiiiiRYZγγ==Σ+,1(cossin)pnbjiiiiiRYZγγ==Σ+,1pncjiiRX==Σ.
(4)SimulationofdrumloadswhenlackingpicksSetaveragecuttingimpedanceofcoalandrockfor240N/mm.
Maingeometricparametersaboutashearerdrumare:haulingspeedis2.
3m/min,drumrevolvingspeedis60.
5r/min,drumdiameteris1.
8m.
Pickarrangementondrumisshowninfigure2,therearethreeheadhelicalvanes,installationanglesofpicksonhelicalvanesareallzero,theirtransversaldistancesare37mm.
Fig.
2PickarrangementsondrumLackingonepicksonthesamehelicalvane.
Importlackingpicksdataofdifferentpositionsonthehelicalvane(numberedΔ)intoMatlabtobesimulated,andvariationcoefficientsofdrumloadsareasshownintable1.
ΔCvaCvbCvcΔCvaCvbCvc20.
058750.
062330.
0576480.
049690.
054650.
0492930.
056230.
060820.
0560590.
049380.
053340.
0471040.
054770.
059730.
05519100.
048220.
051700.
0447050.
053960.
058620.
05386110.
046900.
050500.
0422860.
052430.
056770.
05236120.
045890.
047990.
0410870.
051300.
055680.
05036Non-lacking0.
042600.
043830.
03307Table1LoadvariationcoefficientsoflackingonepickLackingtwopicksonthesamehelicalvane.
ThereisresearchonvariationcoefficientofdrumloadwhenNo.
2or3andanotherpicklacking(numberedΔ,Δ=4-12),andvariationcoefficientsofdrumloadsareasshownintable2.
ΔCvaCvbCvcΔCvaCvbCvc2,40.
084840.
091250.
092663,40.
100480.
107740.
091632,50.
081300.
087140.
088873,50.
082310.
088150.
087612,60.
076780.
081540.
084283,60.
078610.
083620.
085802,70.
071570.
076730.
079113,70.
073890.
079070.
081032,80.
066200.
071130.
073693,80.
068720.
073920.
076282,90.
062160.
066020.
068793,90.
064600.
068740.
071252,100.
058300.
061510.
063123,100.
060270.
063610.
065332,110.
054970.
058070.
058363,110.
056130.
059420.
060122,120.
052970.
055170.
054803,120.
053270.
055430.
05587Table2LoadvariationcoefficientsoflackingtwopicksonsamehelicalvaneFigure3issimulationcurvesofloadswhennon-lackingpick;figure4andfigure5arerespectivelysimulatedcurvesofdrumloadswhenlackingNo.
10andlackingNo.
10&No.
3.
Fig.
3Non-lackingpickFig.
4Δ=10Fig.
5Δ=3&10Lackingtwopicksonadjacenthelicalvane.
ThereisresearchonvariationcoefficientofdrumloadwhenNo.
15or16andanotherpicklacking(Δ=4-12),andvariationscoefficientsofdrumloadsareasshownintable3.
ΔCvaCvbCvcΔCvaCvbCvc15,40.
056430.
060640.
0607516,40.
054760.
059530.
0567415,50.
057930.
061970.
0637316,50.
055370.
059700.
0592215,60.
059820.
063840.
0669316,60.
056240.
060380.
0620015,70.
062700.
066490.
0691416,70.
058390.
062450.
0640615,80.
065330.
070040.
0729716,80.
060610.
065360.
0677115,90.
068840.
072700.
0740116,90.
064110.
068040.
0691415,100.
070670.
074690.
0753316,100.
066260.
070580.
0710215,110.
071880.
076200.
0747316,110.
067990.
072650.
0710115,120.
071800.
075430.
0739816,120.
067050.
072650.
07092Table3LoadvariationcoefficientsoflackingtwopicksonadjacenthelicalvaneAnalysisofsimulationresultsComparingfigure4withfigure3findsobviousloadingfluctuations.
Figure3decreasesmoreobviouslythanfigure4inrange100-200,whilefigure3hasanobviousincreasingprocessin200-350°.
Analysisshowsthatlackingpicksshouldhavecutcoalintherange100-200,butlackingpickleadloadondrumtodecrease;thepicks,whichonthesametransversalandnexttothelackingpick,cutdoublethicknessesofcoalleadloadondrumtoincreaseintherange200-350°.
Thesamesituationcanbereflectedonthetendencybetweenfigure4andfigure5.
Asshownintable1,whenexistingonelackingpickondrum,thecloseroflackingpicktothecoalseamexposedsurface,thesmallercoefficientvariationsofdrumloadsis.
Analyzingindicatesthatthecloseroflackingpickpositiontothecoalexposedsurfaceis,thesmallerpressurecoefficientofcoalis.
Thenleadthedecreaseofinfluenceondrum.
Table2andtable3showthatlackingtwopicksonthesamehelicalvane,horizontalorlongitudinalcontrast,theloadvariationcoefficientdecreaseswiththepositionangleoflackingtwopicksincreases;whentwolackingpicksonadjacenthelicalvanes,longitudinalcontrast,thevariationcoefficientofloadfirstincreasesthendecreaseswiththepositionangleoflackingtwopicksdecreases.
Owingtotwolackingpicksonthehelicalvane,thesmallerpositionangleoflackingtwopicksis,themoreconsistentofnextpickschangingofcutthicknessis,whichonthesametransversalwiththelackingpicks,soitaddsthevariationcoefficientofdrumload;atthesametime,picksareclosertothecoalexposedsurfacewhenΔchangesfrom4to12,suchthesituationisasseenintable2andtable3.
ConclusionsThemainreasonofappearingabigloadfluctuationondrumwhenhelicalvaneislackofpicksisthatthelackingpicksdon'tcutcoalandrock,thenextpickonthesametransversalwillcuttwocuttingthicknessesofcoalandrock,thereforeloadschangetoomuchincertainranges.
Lackingonepickonhelicalvane,thecloserpositionoflackingpicktothecoalexposedsurfaceis,thesmallerloadfluctuationofdrumis.
Inaddition,whenlackingtwopicksonhelicalvane,threedirectionalloadfluctuationsofdrummainlydependontwofactors,oneisthelocationofthetwolackingpicksandtheotheristhepositionangle.
Thesmallerpositionangleofthelackingtwopicksis,thegreaterloadfluctuationcanbe;thecloserlackingtwopickstocoalseamexposedsurfaceis,thesmallerdrumloadfluctuationis.
Theresearchmethodcansimulateloadsonadrumandtheirchangesaccuratelyintheconditionoflackingpicks,whichlaysthefoundationofexploringtheinfluencetoloadchangesondrumwhenlackingpicks.
AcknowledgementsThisworkwassupportedby:1NationalNaturalScienceFoundation-fundedProject(59774033);2Sci.
&tech.
researchguidanceprojectsofChinaCoalIndustryAssociation(MTKJ2011-325).
References[1]LiuSongyong,DuChanglong,CuiXinxia.
Thesimulationanalysisandinvestigationofthedrumloadspectrumofashearer.
JournalofShandongUniversityofScienceandTechnology(NaturalScience),2008,27(1):11-13.
[2]GuoYingfu,ZhangYongzhong,LiuShunde.
Computersimulationofsheardrumloadandcountermeasureofreducingloadfluctuation.
Mining&ProcessingEquipment,2001(5):24-26.
[3]WangHongying,LiXiaohuo.
Miningcoalmechanicalpicktruncationtoothloadmathematicalmodelestablishmentanalysis.
CoalMineMachinery,2007,8(4):90-92.
[4]SuRunping,AnDaoxing.
Computeraideddesignofscrewrollingdrumofcoalminingmachine.
MechanicalEngineering&Automation,2005,21(4):95-97.
[5]WangHongying,LiuChunsheng,WangJinbo.
Thepicktineandknifetinecutforceexperimentalanalysisofcoalcutter.
CoalMineMachinery,2002,23(6):29-31.
com,byaotianyu85833@sina.
com,cmuyongcheng2006@sina.
com,dhuyantao1982@163.
comKeywords:Drumshearer;Helicalvane;Cuttingpick;Load;MatlabAbstract.
Inordertomasterloadmagnitudeadrumanditschangesunderlackingpickscondition,findouttheinfluenceondrumloadswhenlackingpicksonhelicalvanes,explorefailurereasonsofashearerdrum,amathematicalmodelofshearerdrumloadswasanalyzedandestablishedinthepaper,usingMatlabcomputeranalysisprogram,drumloadsandtheirchangesunderseveralconditionsweresimulatedwhenlackingpicksonhelicalvanes,andtheinfluencetoshearerdrumloadoflackingpicksondifferentpositionswasanalyzed.
Theresultsindicatethat,thecloserlackingpickpositiontotheseamexposedsurface,thesmallerdrumloadfluctuationiswhenexistingonelackingpickonhelicalvane;theloadfluctuationandpositionangleoftwolackingpicksonthedruminverselyproportionalwhenexistingtwolackingpicksonhelicalvane,whichisroughlyinaccordwiththeactualsituation.
IntroductionDuetoabadworkingenvironment,alackingpickphenomenonoftenhappensduringashearerworks,ashearerunderlackingpickconditionwillaffectdrumworkreliability,servicelife,cuttingperformanceandproductivity[1,2].
Researchforthedrumloadsandtheirchangeruleswhenashearernormalworkinghavealreadyexisted[3-5],butdidnotseethereportaboutloadsandinfluenceswhenlackingpicksonashearer.
Soitisimportanttofindoutdrumloadsandtheirinfluencesonashearerperformancewhenlackingpicksonashearer.
CalculationmethodofloadsonshearerdrumPickforcesondrum.
Theworkingprocessofshearerdrumisshownasfigure1.
Atanymoment,theloadsofithpick(positionAngleisγi)[3-5]areasfollowsFig.
1Forcedanalysisofpickonshearerdrum(1)Cutresistance0.
50.
1750.
31101000.
5cosizycotqjyddZAhtKKKKKKfkSdBhσθ++.
(1)(2)Tractionresistance0.
50.
1750.
31101000.
5cosizycotqjyddYAhtKKKKKKkSdBhσθ++.
(2)(3)Lateralresistance132[]iiChXZCCht=++.
(3)Where,Aiscoalseamaveragecuttingimpedance;h,tisrespectivelyaveragecuttingthicknessandaveragetransversaldistance;σyispickunidirectionalcompressivestrength;Kφ,Kc,Kot,Kqarerespectivelypickfrontinfluencecoefficient,pickarrangementinfluencecoefficient,minepressureinfluencecoefficient,ratiocoefficientoftractionresistanceandcuttingresistance.
Instantaneousdrumloads.
Asshowninfigure1,instantaneousdrumloadsarevectorsumofeachforcecuttingcoalandrock.
Anymomentj,threedirectionalloadsofadrum(directionofvertical''a',directionoftraction'b',axialdirectionofdrum'c')are1(sincos)pnajiiiiiRYZγγ==Σ+,1(cossin)pnbjiiiiiRYZγγ==Σ+,1pncjiiRX==Σ.
(4)SimulationofdrumloadswhenlackingpicksSetaveragecuttingimpedanceofcoalandrockfor240N/mm.
Maingeometricparametersaboutashearerdrumare:haulingspeedis2.
3m/min,drumrevolvingspeedis60.
5r/min,drumdiameteris1.
8m.
Pickarrangementondrumisshowninfigure2,therearethreeheadhelicalvanes,installationanglesofpicksonhelicalvanesareallzero,theirtransversaldistancesare37mm.
Fig.
2PickarrangementsondrumLackingonepicksonthesamehelicalvane.
Importlackingpicksdataofdifferentpositionsonthehelicalvane(numberedΔ)intoMatlabtobesimulated,andvariationcoefficientsofdrumloadsareasshownintable1.
ΔCvaCvbCvcΔCvaCvbCvc20.
058750.
062330.
0576480.
049690.
054650.
0492930.
056230.
060820.
0560590.
049380.
053340.
0471040.
054770.
059730.
05519100.
048220.
051700.
0447050.
053960.
058620.
05386110.
046900.
050500.
0422860.
052430.
056770.
05236120.
045890.
047990.
0410870.
051300.
055680.
05036Non-lacking0.
042600.
043830.
03307Table1LoadvariationcoefficientsoflackingonepickLackingtwopicksonthesamehelicalvane.
ThereisresearchonvariationcoefficientofdrumloadwhenNo.
2or3andanotherpicklacking(numberedΔ,Δ=4-12),andvariationcoefficientsofdrumloadsareasshownintable2.
ΔCvaCvbCvcΔCvaCvbCvc2,40.
084840.
091250.
092663,40.
100480.
107740.
091632,50.
081300.
087140.
088873,50.
082310.
088150.
087612,60.
076780.
081540.
084283,60.
078610.
083620.
085802,70.
071570.
076730.
079113,70.
073890.
079070.
081032,80.
066200.
071130.
073693,80.
068720.
073920.
076282,90.
062160.
066020.
068793,90.
064600.
068740.
071252,100.
058300.
061510.
063123,100.
060270.
063610.
065332,110.
054970.
058070.
058363,110.
056130.
059420.
060122,120.
052970.
055170.
054803,120.
053270.
055430.
05587Table2LoadvariationcoefficientsoflackingtwopicksonsamehelicalvaneFigure3issimulationcurvesofloadswhennon-lackingpick;figure4andfigure5arerespectivelysimulatedcurvesofdrumloadswhenlackingNo.
10andlackingNo.
10&No.
3.
Fig.
3Non-lackingpickFig.
4Δ=10Fig.
5Δ=3&10Lackingtwopicksonadjacenthelicalvane.
ThereisresearchonvariationcoefficientofdrumloadwhenNo.
15or16andanotherpicklacking(Δ=4-12),andvariationscoefficientsofdrumloadsareasshownintable3.
ΔCvaCvbCvcΔCvaCvbCvc15,40.
056430.
060640.
0607516,40.
054760.
059530.
0567415,50.
057930.
061970.
0637316,50.
055370.
059700.
0592215,60.
059820.
063840.
0669316,60.
056240.
060380.
0620015,70.
062700.
066490.
0691416,70.
058390.
062450.
0640615,80.
065330.
070040.
0729716,80.
060610.
065360.
0677115,90.
068840.
072700.
0740116,90.
064110.
068040.
0691415,100.
070670.
074690.
0753316,100.
066260.
070580.
0710215,110.
071880.
076200.
0747316,110.
067990.
072650.
0710115,120.
071800.
075430.
0739816,120.
067050.
072650.
07092Table3LoadvariationcoefficientsoflackingtwopicksonadjacenthelicalvaneAnalysisofsimulationresultsComparingfigure4withfigure3findsobviousloadingfluctuations.
Figure3decreasesmoreobviouslythanfigure4inrange100-200,whilefigure3hasanobviousincreasingprocessin200-350°.
Analysisshowsthatlackingpicksshouldhavecutcoalintherange100-200,butlackingpickleadloadondrumtodecrease;thepicks,whichonthesametransversalandnexttothelackingpick,cutdoublethicknessesofcoalleadloadondrumtoincreaseintherange200-350°.
Thesamesituationcanbereflectedonthetendencybetweenfigure4andfigure5.
Asshownintable1,whenexistingonelackingpickondrum,thecloseroflackingpicktothecoalseamexposedsurface,thesmallercoefficientvariationsofdrumloadsis.
Analyzingindicatesthatthecloseroflackingpickpositiontothecoalexposedsurfaceis,thesmallerpressurecoefficientofcoalis.
Thenleadthedecreaseofinfluenceondrum.
Table2andtable3showthatlackingtwopicksonthesamehelicalvane,horizontalorlongitudinalcontrast,theloadvariationcoefficientdecreaseswiththepositionangleoflackingtwopicksincreases;whentwolackingpicksonadjacenthelicalvanes,longitudinalcontrast,thevariationcoefficientofloadfirstincreasesthendecreaseswiththepositionangleoflackingtwopicksdecreases.
Owingtotwolackingpicksonthehelicalvane,thesmallerpositionangleoflackingtwopicksis,themoreconsistentofnextpickschangingofcutthicknessis,whichonthesametransversalwiththelackingpicks,soitaddsthevariationcoefficientofdrumload;atthesametime,picksareclosertothecoalexposedsurfacewhenΔchangesfrom4to12,suchthesituationisasseenintable2andtable3.
ConclusionsThemainreasonofappearingabigloadfluctuationondrumwhenhelicalvaneislackofpicksisthatthelackingpicksdon'tcutcoalandrock,thenextpickonthesametransversalwillcuttwocuttingthicknessesofcoalandrock,thereforeloadschangetoomuchincertainranges.
Lackingonepickonhelicalvane,thecloserpositionoflackingpicktothecoalexposedsurfaceis,thesmallerloadfluctuationofdrumis.
Inaddition,whenlackingtwopicksonhelicalvane,threedirectionalloadfluctuationsofdrummainlydependontwofactors,oneisthelocationofthetwolackingpicksandtheotheristhepositionangle.
Thesmallerpositionangleofthelackingtwopicksis,thegreaterloadfluctuationcanbe;thecloserlackingtwopickstocoalseamexposedsurfaceis,thesmallerdrumloadfluctuationis.
Theresearchmethodcansimulateloadsonadrumandtheirchangesaccuratelyintheconditionoflackingpicks,whichlaysthefoundationofexploringtheinfluencetoloadchangesondrumwhenlackingpicks.
AcknowledgementsThisworkwassupportedby:1NationalNaturalScienceFoundation-fundedProject(59774033);2Sci.
&tech.
researchguidanceprojectsofChinaCoalIndustryAssociation(MTKJ2011-325).
References[1]LiuSongyong,DuChanglong,CuiXinxia.
Thesimulationanalysisandinvestigationofthedrumloadspectrumofashearer.
JournalofShandongUniversityofScienceandTechnology(NaturalScience),2008,27(1):11-13.
[2]GuoYingfu,ZhangYongzhong,LiuShunde.
Computersimulationofsheardrumloadandcountermeasureofreducingloadfluctuation.
Mining&ProcessingEquipment,2001(5):24-26.
[3]WangHongying,LiXiaohuo.
Miningcoalmechanicalpicktruncationtoothloadmathematicalmodelestablishmentanalysis.
CoalMineMachinery,2007,8(4):90-92.
[4]SuRunping,AnDaoxing.
Computeraideddesignofscrewrollingdrumofcoalminingmachine.
MechanicalEngineering&Automation,2005,21(4):95-97.
[5]WangHongying,LiuChunsheng,WangJinbo.
Thepicktineandknifetinecutforceexperimentalanalysisofcoalcutter.
CoalMineMachinery,2002,23(6):29-31.
- directional163相关文档
- HCC110cc163
- 尺寸(mm)操作區域手控
- 车轮163
香港站群多ip服务器多少钱?零途云香港站群云服务器怎么样？
香港站群多ip服务器多少钱?想做好站群的SEO优化，最好给每个网站都分配一个独立IP，这样每个网站之间才不会受到影响。对做站群的站长来说，租用一家性价比高且提供多IP的香港多ip站群服务器很有必要。零途云推出的香港多ip站群云服务器多达256个IP，可以满足站群的优化需求，而且性价比非常高。那么，香港多ip站群云服务器价格多少钱一个月?选择什么样的香港多IP站群云服务器比较好呢?今天，小编带大家一...
快云科技,美国VPS 2H5G独享20M 仅售19.8/月 年付仅需148
快云科技已稳步运行进两年了 期间没出现过线路不稳 客户不满意等一系列问题 本司资质齐全 持有IDC ICP ISP等正规手续 有独特的网站设计理念 在前几天刚是参加过魔方系统举行的设计大赛拿获最佳设计奖第一名 本公司主营产品 香港弹性云服务器，美国vps和日本vps，香港物理机，国内高防物理机以及美国日本高防物理机 2020年的国庆推出过一款香港的回馈用户特惠机 已作为传家宝 稳定运行 马上又到了...
iHostART：罗马尼亚VPS/无视DMCA抗投诉vps;2核4G/40GB SSD/100M端口月流量2TB,€20/年
ihostart怎么样?ihostart是一家国外新商家，主要提供cPanel主机、KVM VPS、大硬盘存储VPS和独立服务器，数据中心位于罗马尼亚，官方明确说明无视DMCA，对版权内容较为宽松。有需要的可以关注一下。目前，iHostART给出了罗马尼亚vps的优惠信息，罗马尼亚VPS无视DMCA、抗投诉vps/2核4G内存/40GB SSD/100M端口月流量2TB,€20/年。点击直达：ih...
www.cc163.net为你推荐
-
工艺美术品设计专业newlyroute支持ipad齐鲁工业大学高水平学科建设专项化学品安全技术说明书勒索病毒win7补丁为了防勒索病毒，装了kb4012212补丁，但出现关机蓝屏的问题了，开机正常ipadwifiIPAD连上了WIFI，但是无法上网，急！！127.0.0.1为什么输入127.0.0.1无法打开页面win7关闭135端口win7系统怎么关闭135端口？网上很多方法都不好用！google分析google分析打不开了？