毕业论文英文答辩(CRANE)分析

The Design of the Overall and A Type of Door Frame of 60 Tons Gantry Cranespeaker：xxxlTheMainContentsuthe basis of the paperuthe research contentsuthe research methodsusummary and outlooklTheBasisofThePapern1.The Development of CraneuIn recent years,the role of the lifting transportation machinery is beyond the scope of auxiliary equipment due to the continuous development of industrial technology.And then this machinery has been directly used in the production process.It has been the main parts of the assembly line.uTendencyn2.The shortage of the domestic cranesuThe performance of products and development ability is weak;uThe level of manufacturing technology is low;uThe product detection level is not high;uThe fittings supply is insufficient and the quality is poor;uThe update of product technology standard is lag and is lack of executive force.lTheResearchContentsuThe Design of the Overall and A Type of Door Frame of 60 Tons Gantry Crane.uDetermining the overall design,including the door height,the main girders span,gate leg type and basic size,etc.uCalculating the strength of components or structure of the crane,then checking the strength and stability.ltheresearchmethodsn1.The design parameters elevating capacity Q=60ttype of door legAlifting altitude H=12mLifting speed v=10m/minrunning speed of little vehicle Vc=45m/minrunning speed of big vehicle v=42m/minClassification grade of the whole machine average A5Classification grade of mechanismM5 structuresingle boxes and double beamsmaterialSteel structuren2.The Type of LoadTYPECONTENTSWORKING CONDITIONSMARGIN of SAFETYfatigue,wear and heat loadthe general working conditions1.5static strength,the stability of the local mechanisms stability and stability against overturningthe most unfavorable working conditions1.33 the intensity of a certain safety device against the storm blow awaynone working state1.15n3Confirming A Preliminary SchemeuThe door frame:type A legs,single box,double beams structure.uThe height of main girder is H=15 m,the span is L=30m.uThe hinge type of legs is two rigid legs.n4.DesigntheDimensionsuThe determination of main girder geometry size.uGeometricFeaturesofGirdersAreas:SL=48976 mm2Moment of inertia:Ix=Iy=Section modulus：Wx=Wy=uThe determination of cross-section geometry size of door legs.uGeometricFeaturesofDoorLegsAreas:ST=60576 mm2Moment of inertia:Ix=Iy=Sction modulus：Wx=Wy=n4.CaulculateLoadThe types of loadThe value of loadDistributed load of portal frameThe pressure of little vehicles roolsThe inertia force of little vehicle while brakingThe inertia force of big vehicle while brakinguWind LoadsWind loadsThe value of loads On cargosOn little vehicleOn main beamOn legsn5.CaulculatetheInternalForceofGirderThe internal force diagrams of girder Type of loadThe position of little cardistributed load of girdermoving load midspan-769137102326cantilever-7691371-2601-1301 Type of loadThe position of little carThe inertia force of little vehicle while brakingComposite bending momentmidspan16881-6013778cantilever16881-3202151uThe vertical in-plane bending moment of girder loadThe position of little carThe function of midspan-4132cantilever-8552uThe horizontal in-plane bending moment of girdern6.CheckingtheStrengthofGirderuThe maximum value of bending stress is:(1)While the little vehicle is at the midspan.(2)While at the cantileveSo,the selected size meets the strength demand of girder.n7.CaulculatetheInternalForceofDoorLegs.uWhile the little vehicle is located in the the main girder across.uWhile at the cantilever.uCheckingtheStrengthofDoorLegs.uThe maximum value of the door legs is:(while the little vehicle is located in the main girder across)So,the selected size meets the strength demand of door legs.lSummaryandOutlooknThe design of the main beams and doors leg has been illustrated in detail in this paper.In accordance with limit stress calculation method and allowable stress calculation method,the author has checked the strength of the main beams and doors leg.In the end,the author has determined the final decision of the appropriate size in the main beam and doors leg flat plane.nAnewstageofthe design of the crane uElectronic Computer TechnologyuOptimization of EngineeringuValue EngineeringuReliability EngineeringuCreating EngineeringuMan-machine EngineeringThese new technologies are promoting many interdisciplinary design methods which are more innovative,higher quality and higher efficiency.