抓斗桥式双梁起重机主梁的有限元分析与改进

发布时间：2018-05-12 11:19

本文选题：抓斗桥式双梁起重机 + 强度　；参考：《辽宁科技大学》2012年硕士论文

【摘要】：抓斗桥式双梁起重机被广泛地应用于工业生产的起重作业中,箱型结构的主梁是其重要的部件之一,其强度和刚度要有充分的保证,才能满足实际的生产需求。本文的研究对象为某矿场实际作业的20t桥式双梁起重机的主梁。该起重机的箱型主梁由纵横交错的钢板焊接而成,结构非常复杂。在使用过程中存在主梁变形大的问题,结构显得单薄,需要进行改进,并需要其强度和刚度的理论分析和支持。显而易见,采用经典的材料力学和结构力学来进行分析,将会产生很大的误差。本文采用板梁结合的有限元模型解决了分析难题。确定了动载冲击系数,对该桥式双梁起重机的箱型结构主梁进行了有限元分析,并对其进行了刚度和强度的计算。从其分析的结果可知,有限元分析与实际测量的结果误差率为3.6%,从而可知有限元分析的结果是可靠的。在以上基础上,对主梁进行了计算机有限元仿真加固的四种方案设计,并进行了比较。最佳方案的强度比原梁提高了38.7%,刚度比原梁提高了33.9%。以上所作的工作为该机的改造和加固提供了有益的理论参考。
[Abstract]:Grab bridge type double girder crane is widely used in the lifting operation of industrial production. The main beam of box structure is one of its important components. Its strength and stiffness must be fully guaranteed in order to meet the actual production needs. The research object of this paper is the main beam of 20t bridge type double beam crane which is actually working in a mine. The box girder of the crane is welded by crisscross steel plate and the structure is very complicated. In the process of use, the main beam has the problem of large deformation, the structure appears thin, needs to be improved, and needs theoretical analysis and support of its strength and stiffness. It is obvious that using classical mechanics of materials and structural mechanics to analyze will lead to great errors. In this paper, the finite element model of plate-beam combination is used to solve the problem of analysis. The impact coefficient of dynamic load is determined, and the finite element analysis of the main girder of the box structure of the bridge crane is carried out, and the stiffness and strength of the main girder are calculated. From the results of its analysis, it can be seen that the error rate between the finite element analysis and the actual measurement is 3.6, which shows that the results of the finite element analysis are reliable. On the basis of above, four schemes of computer finite element simulation reinforcement for main beam are designed and compared. The strength of the optimum scheme is 38.7 higher than that of the original beam, and the stiffness is 33.9% higher than that of the original beam. The above work provides a useful theoretical reference for the reconstruction and reinforcement of the machine.
【学位授予单位】：辽宁科技大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH215

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