The Design And Mechanical Analysis Of CWGD250 Extension Boom Building Maintenance Unit

With the rapid development of Chinese construction industry and the number of high-rise building increasing quickly,The Building Maintenance Unit(BMU)as a special equipment which function are cleaning,maintenance and installation have been widely used.In order to satisfy adaptability of the different BMU to a particular building roof structure,its structure and security are needed to constantly improve.However,researches of the BMU start late in our domestic market,because of the weakness of design experience,which lead to the traditional design method unable to meet the complicated and varied requirements about the BMU.Therefore,there are a certain practical significance to research the new structure to enrich BMU product types and satisfy the diversified demands of construction industry.In this thesis,a new structure type of the BMU model was studied,the virtual prototype design technology as a main research means was used,which analyze and research the typical work conditions aim at the CWGD250 extension boom institution using the finite element analysis method.The main content of this thesis is as follows:First,as a design foundation,the extension boom institution dynamic parameters was used to design driving effiency of the drive motor,which had finished design of its main assembly units,structure mechanical characters analysis and degree of freedom analysis to ensure the BMU has certain movement.Combined with standards,this thesis determined the extension lifting boom institution mechanical model and established its finite element model on the basis of structural mechanics analysis method and finite element analysis method.According to analyze the anti-capsize property of the BMU,its work stability and entire structure design availability were ensured.After that,three typical work conditions were obtained,which checked strength and stiffness of the extension boom institution using ANSYS to do some mechanics analysis satisfy design requirement and ensure its work stability.According to work condition comparision,the most dangerous work condition and the assembly unit location was acquired,6 natural frequencies of lifting boom institution,mode shapes and maximum structural displacement were obtained during modal and random vobration analysis.Then,the velocity,displacement and acceleration dynamic response curves of front boom in a moment full of start to rise from the ground and running smoothly sudden braking moment were acquired during transient analysis,which verified its consistency between dynamic load coefficient and standards.In the end,a extension luffing mechanisam dynamic simulation was made using ADAMS,the parallel lift and stability of the BMU was verified.Optimization improvement opinions were proposed for the structures that can not satisfy the design requirement.Finally,design and analysis of the BMU were completed.In this thesis,results of the research will provide a certain scientific basis and theoretical guidance,take great significance for designing technology of the BMU.