削刀切削土体之前先行切削土体,将土体切割分块,为切削刀创造良好的切削条件。采用超前刀,一般可显著增加切削土体的流动性,大大降低切削刀的扭2刀具磨损的原因和影响因素
矩,提高刀具切削效率,减少切削刀的磨耗。在松散
在盾构推进力作用下刀具对开挖面土体产生一
工程机械
2006(1)
—25—
VL=10δ令Pe=V
(2)(3)刀具转动距离寿命λ
λ=δ=tD=2R,可得到:・(3)L=10λPe=5Pλ
πR
式中:Pe———刀具的切入量,即刀具每转的切入深度
—26—
λ=t
式中:t———限定磨损量,通常允许值定在10~20
mm,此时取20mm
——根据切削刀具材质和地质条件所决定的K—
工程机械2006(1)
图2刀具磨损量与掘进距离寿命的预测曲线
工程机械
2006(1)—27—
壳单元和实体单元联合建立限元模型,采用梁单元、
了桅杆起重机的整体有限元模型。同时对主轴、绳轴和铰耳[2]也建立了准确的有限元模型。模型的真实和准确使分析结果更为精确。
1结构概述
WQ-350型桅杆起重机标准高度62m,中间最
—28—
杆在一个平面内,也就是布置在截面的最外侧,所以抗弯扭能力最强。两节之间只要插入4根销轴即可,如果采用高强螺栓连接要安装二十多个螺栓,而且由于空间小,螺栓的安装比较费时。
2力学分析
桅杆整体结构可以看作一根梁,两端铰支(如图
工程机械
2006(1)
ConstructionMachineryandEquipment
Vol.37No.1AbstractsinEnglish
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
FormingofHelicalVanesinMixingDrumofConcreteTransitMixer
Thesurfaceequationsandapproximateunfoldingcalculationsforthehelicalvanes,whichfeaturesnon-expandingspacialsurface,inmixingdrumofconcretetransitmixerarestudiedinthepaper.Basedonfiniteelementdigitalformingoflargeelastoplasticde-formingtechnology,thereboundissimulated,whichwasappliedtothedesignofformingmouldofhelicalvanes.Thepracticalap-plicationshowsthatreboundsimulationandmulti-routeformingtechnologysignificantlyimprovedtheeffectandefficiencyofheli-calvaneforming,thereforethemixingdrumperformanceandtheconcretequalityaresignificantlyraised.
Keywords:HelicalvaneHelicalsurfaceUnfolding
ReboundsimulationMoulddesign
DevelopmentofaMomentLimiterwith"BlackBox"Func-tionforCranes
Adesignmethodforcrane"blackbox"basedonsinglechipcom-puterisdescribedinthearticle.Hardwareandsoftwaredesignfortheblackboxareexpatiated,aswellasthedesignmethodforcommunicationsoftwareofhostcomputerbasedonVB6.0.Themomentlimiterisalreadyusedonmilitaryvehiclessuccessfullyandprovedtobesuitabletovariouscranes.Keywords:Blackbox
Momentlimiterofcrane
Serial
communicationHostcomputer
CRIFuelFeedingSystem
Thecharacteristics,composition,workprinciple,structureandcomponentfunctionsofCRIfuelfeedingsysteminKomatsuelec-tronicenginesareintroducedinthearticle.Pressuregenerationandcontrolinfuelinjectionpump,workprocedureofPVCvalve,workprincipleoffuelinjectorandthecontrolonfuelinjectingaswell,arealldescribed.
Keywords:DieselengineFuelinjectionsystemElectronic
controlStructurePrinciple
CalculationforServiceLifeofCuttingToolsofShields
FrequencyCharacteristicsofBalanceBeaminLevelingSystemofAsphaltConcretePaver
Structureandworkprincipleofbalancebeamsonasphaltpaverareexpatiatedinthearticle.Usingsinerotationvectorasanindi-cationmethod,theinfluencesofdatumbeamlength,slidingbootsgapandlengthonfrequencycharacteristicsofthebeamareana-
Throughtheanalysisonwearcausesofcuttingtoolsonshieldsandthecalculationonitsservicelife,theneedtochangethetoolsdur-ingthetunnelingofshieldandthefrequencyoftoolschangingcanbepredictedorestimated.Analysismethodtoestimateservicelifeofcuttingtoolsisdemonstratedwithanactualcalculationexample.Keywords:ShieldCuttingtoolWearServicelife
ADynamicTestDeviceforMeshingPerformanceofRub-berTrack
Workprincipleandmainperformanceparametersofadynamictestdeviceformeshingperformanceofrubbertracksaredescribedinthearticle.Thetestdevicefeaturesaccuratelytesting,fastandeasyinstallationfortestedtracks.Thetestinstrumentsarereliableinperformance,shortinsamplingtimeandhighinaccuracy.Thedynamictestdeviceformeshingperformanceofrubbertrackisusedfortheverificationofdynamicmeshingperformanceofrub-bertracksandthetestoffluctuationsofdrivespeedanddriveforceindrivingprocessofthetracks.
Keywords:RubbertrackMeshingperformance
Testdevice
ImplementationandApplicationofthePrincipleofanAutomatedMechanicalSpeedAdjustmentMechanismAcompletelymechanicalautomatedspeedadjustmentmechanismisdescribed.Withit,outputshaftspeedcanbeautomaticallyreg-ulatedaccordingtooutsideloadchangetoreachthepurposeofautomatedspeedadjustment.Comparedwiththeexistingautomat-edspeedadjustmentsofmechanical-electrical,hydro-electricalandtotallyhydraulicsystems,itfeaturessimplestructure,easyproduction,flexibleandconvenientoperation.Itcanbeusedinsinglestageormulti-stagemodesandcanbeadoptedincranes,machinetoolsandetc.
Keywords:AutomatedspeedadjustmentmechanismMe-
chanicalPrincipleimplementationApplication
lyzed.Throughthestudyonamplitudecharacteristiccurve,theoptimumdesignofslidingbootsondatumbeamispresentedtoensurethebestattenuationcapabilityofthebeamtopavementfluctuationinterference.
Keywords:AsphaltconcretepaverDatumbeamFrequen-
cyCharacteristic
削刀切削土体之前先行切削土体,将土体切割分块,为切削刀创造良好的切削条件。采用超前刀,一般可显著增加切削土体的流动性,大大降低切削刀的扭2刀具磨损的原因和影响因素
矩,提高刀具切削效率,减少切削刀的磨耗。在松散
在盾构推进力作用下刀具对开挖面土体产生一
工程机械
2006(1)
—25—
VL=10δ令Pe=V
(2)(3)刀具转动距离寿命λ
λ=δ=tD=2R,可得到:・(3)L=10λPe=5Pλ
πR
式中:Pe———刀具的切入量,即刀具每转的切入深度
—26—
λ=t
式中:t———限定磨损量,通常允许值定在10~20
mm,此时取20mm
——根据切削刀具材质和地质条件所决定的K—
工程机械2006(1)
图2刀具磨损量与掘进距离寿命的预测曲线
工程机械
2006(1)—27—
壳单元和实体单元联合建立限元模型,采用梁单元、
了桅杆起重机的整体有限元模型。同时对主轴、绳轴和铰耳[2]也建立了准确的有限元模型。模型的真实和准确使分析结果更为精确。
1结构概述
WQ-350型桅杆起重机标准高度62m,中间最
—28—
杆在一个平面内,也就是布置在截面的最外侧,所以抗弯扭能力最强。两节之间只要插入4根销轴即可,如果采用高强螺栓连接要安装二十多个螺栓,而且由于空间小,螺栓的安装比较费时。
2力学分析
桅杆整体结构可以看作一根梁,两端铰支(如图
工程机械
2006(1)
ConstructionMachineryandEquipment
Vol.37No.1AbstractsinEnglish
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
FormingofHelicalVanesinMixingDrumofConcreteTransitMixer
Thesurfaceequationsandapproximateunfoldingcalculationsforthehelicalvanes,whichfeaturesnon-expandingspacialsurface,inmixingdrumofconcretetransitmixerarestudiedinthepaper.Basedonfiniteelementdigitalformingoflargeelastoplasticde-formingtechnology,thereboundissimulated,whichwasappliedtothedesignofformingmouldofhelicalvanes.Thepracticalap-plicationshowsthatreboundsimulationandmulti-routeformingtechnologysignificantlyimprovedtheeffectandefficiencyofheli-calvaneforming,thereforethemixingdrumperformanceandtheconcretequalityaresignificantlyraised.
Keywords:HelicalvaneHelicalsurfaceUnfolding
ReboundsimulationMoulddesign
DevelopmentofaMomentLimiterwith"BlackBox"Func-tionforCranes
Adesignmethodforcrane"blackbox"basedonsinglechipcom-puterisdescribedinthearticle.Hardwareandsoftwaredesignfortheblackboxareexpatiated,aswellasthedesignmethodforcommunicationsoftwareofhostcomputerbasedonVB6.0.Themomentlimiterisalreadyusedonmilitaryvehiclessuccessfullyandprovedtobesuitabletovariouscranes.Keywords:Blackbox
Momentlimiterofcrane
Serial
communicationHostcomputer
CRIFuelFeedingSystem
Thecharacteristics,composition,workprinciple,structureandcomponentfunctionsofCRIfuelfeedingsysteminKomatsuelec-tronicenginesareintroducedinthearticle.Pressuregenerationandcontrolinfuelinjectionpump,workprocedureofPVCvalve,workprincipleoffuelinjectorandthecontrolonfuelinjectingaswell,arealldescribed.
Keywords:DieselengineFuelinjectionsystemElectronic
controlStructurePrinciple
CalculationforServiceLifeofCuttingToolsofShields
FrequencyCharacteristicsofBalanceBeaminLevelingSystemofAsphaltConcretePaver
Structureandworkprincipleofbalancebeamsonasphaltpaverareexpatiatedinthearticle.Usingsinerotationvectorasanindi-cationmethod,theinfluencesofdatumbeamlength,slidingbootsgapandlengthonfrequencycharacteristicsofthebeamareana-
Throughtheanalysisonwearcausesofcuttingtoolsonshieldsandthecalculationonitsservicelife,theneedtochangethetoolsdur-ingthetunnelingofshieldandthefrequencyoftoolschangingcanbepredictedorestimated.Analysismethodtoestimateservicelifeofcuttingtoolsisdemonstratedwithanactualcalculationexample.Keywords:ShieldCuttingtoolWearServicelife
ADynamicTestDeviceforMeshingPerformanceofRub-berTrack
Workprincipleandmainperformanceparametersofadynamictestdeviceformeshingperformanceofrubbertracksaredescribedinthearticle.Thetestdevicefeaturesaccuratelytesting,fastandeasyinstallationfortestedtracks.Thetestinstrumentsarereliableinperformance,shortinsamplingtimeandhighinaccuracy.Thedynamictestdeviceformeshingperformanceofrubbertrackisusedfortheverificationofdynamicmeshingperformanceofrub-bertracksandthetestoffluctuationsofdrivespeedanddriveforceindrivingprocessofthetracks.
Keywords:RubbertrackMeshingperformance
Testdevice
ImplementationandApplicationofthePrincipleofanAutomatedMechanicalSpeedAdjustmentMechanismAcompletelymechanicalautomatedspeedadjustmentmechanismisdescribed.Withit,outputshaftspeedcanbeautomaticallyreg-ulatedaccordingtooutsideloadchangetoreachthepurposeofautomatedspeedadjustment.Comparedwiththeexistingautomat-edspeedadjustmentsofmechanical-electrical,hydro-electricalandtotallyhydraulicsystems,itfeaturessimplestructure,easyproduction,flexibleandconvenientoperation.Itcanbeusedinsinglestageormulti-stagemodesandcanbeadoptedincranes,machinetoolsandetc.
Keywords:AutomatedspeedadjustmentmechanismMe-
chanicalPrincipleimplementationApplication
lyzed.Throughthestudyonamplitudecharacteristiccurve,theoptimumdesignofslidingbootsondatumbeamispresentedtoensurethebestattenuationcapabilityofthebeamtopavementfluctuationinterference.
Keywords:AsphaltconcretepaverDatumbeamFrequen-
cyCharacteristic