毕业论文英文答辩(CRANE).ppt

The Design of the Overall and A Type of Door Frame of 60 Tons Gantry Crane,speaker：xxx,The Main Contents,the basis of the paperthe research contentsthe research methodssummary and outlook,The Basis of The Paper,1.The Development of CraneIn 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.,Tendency,2.The shortage of the domestic cranesThe performance of products and development ability is weak;The level of manufacturing technology is low;The product detection level is not high;The fittings supply is insufficient and the quality is poor;The update of product technology standard is lag and is lack of executive force.,The Research Contents,The Design of the Overall and A Type of Door Frame of 60 Tons Gantry Crane.Determining the overall design,including the door height,the main girders span,gate leg type and basic size,etc.Calculating the strength of components or structure of the crane,then checking the strength and stability.,the research methods,1.The design parameters,2.The Type of Load,3Confirming A Preliminary SchemeThe door frame:type A legs,single box,double beams structure.The height of main girder is H=15 m,the span is L=30m.The hinge type of legs is two rigid legs.,4.Design the Dimensions,The determination of main girder geometry size.,Geometric Features of Girders,Areas:SL=48976 mm2Moment of inertia:Ix=Iy=Section modulus：Wx=Wy=,The determination of cross-section geometry size of door legs.,Geometric Features of Door Legs,Areas:ST=60576 mm2Moment of inertia:Ix=Iy=Sction modulus：Wx=Wy=,4.Caulculate Load,Wind Loads,5.Caulculate the Internal Force of Girder,The internal force diagrams of girder,The vertical in-plane bending moment of girder,The horizontal in-plane bending moment of girder,6.Checking the Strength of Girder,The maximum value of bending stress is:(1)While the little vehicle is at the midspan.(2)While at the cantileve,So,the selected size meets the strength demand of girder.,7.Caulculate the Internal Force of Door Legs.,While the little vehicle is located in the the main girder across.While at the cantilever.,Checking the Strength of Door Legs.,The 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.,Summary and Outlook,The 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.,A new stage of the design of the crane,Electronic Computer TechnologyOptimization of EngineeringValue EngineeringReliability EngineeringCreating EngineeringMan-machine Engineering,These new technologies are promoting many interdisciplinary design methods which are more innovative,higher quality and higher efficiency.,