Design And Optimization Of Large Span Trusses Of Pipe Belt Conveyor

Tubular belt conveyor direction toward the long-distance, large-span, during the belt conveyor transport, cross-border rivers, buildings, railways and other obstacles phenomenon increasingly common, ordinary span tubular belt conveyor it is difficult to meet the requirements, often require large-span tubular belt conveyor. So the study of belt conveyor systems also support large-span is necessary. How to design large-span steel truss structure to improve performance and reduce the tubular belt conveyor has a critical influence manufacturing costs.Based on the tubular belt conveyor toward the long-distance, large-span direction of the development of the concept, with reference to the design principles of the tubular belt conveyor with large-span truss design method is proposed tubular belt conveyor large-span truss design elements, the establishment of a three-dimensional model of the truss, truss internal forces were deduced, then the finite element stress, modal and harmonic response analysis, internal force distribution of each element truss, reference analysis of dangerous section trusses were structural improvements after improved truss force has improved significantly, and finally to the main part of the truss optimized optimized truss weight decreased. Details are as follows:After a review of relevant literature at home and abroad to understand the major domestic and foreign steel truss building analysis in the form of large-span steel truss structure and its characteristics, analyzes the characteristics and advantages and disadvantages of each architecture, and design of steel structures and methods for drawing large span summary design truss. It describes the construction and design requirements truss features, shape, cross-section and nodes.Analysis of the tubular belt conveyor truss subject to various forms of load and load joist theoretical calculation, using the section method of internal force calculation Truss row simplified formula was deduced truss internal stress distribution, and the strength of the joist stiffness checked.The establishment of a three-dimensional modeling of the tubular belt conveyor truss structure, the use of a large common software ANSYS modal analysis, truss 1-6 order natural frequencies and mode shapes to determine the vibration characteristics of the structure to obtain a deformation of the truss, finite element stress analysis, the trusses equivalent stress cloud and displacement contour, and the strength and stiffness of finite element calculation under check. Finite Element Analysis is consistent with the theoretical analysis. However, due to the middle of the truss deformation is too large, worried that practical application will affect the work, then truss structure has been improved, truss improved force has been significantly improved.Studying on the optimization of truss analysis related methods. Optimization previous reference to the strength and stiffness of ANSYS Workbench analysis is based on the danger to optimize truss segment, since the maximum stress occurs in the middle of the truss chords and webs at, so the chords and webs optimization its cross-sectional dimensions as design variables, stress, weight evaluation criteria, response surface optimization, finally got out of the best design.