本文選題：抓斗橋式雙梁起重機(jī) + 強(qiáng)度�。� 參考：《遼寧科技大學(xué)》2012年碩士論文

【摘要】：抓斗橋式雙梁起重機(jī)被廣泛地應(yīng)用于工業(yè)生產(chǎn)的起重作業(yè)中,箱型結(jié)構(gòu)的主梁是其重要的部件之一,其強(qiáng)度和剛度要有充分的保證,才能滿足實際的生產(chǎn)需求。 本文的研究對象為某礦場實際作業(yè)的20t橋式雙梁起重機(jī)的主梁。該起重機(jī)的箱型主梁由縱橫交錯的鋼板焊接而成,結(jié)構(gòu)非常復(fù)雜。在使用過程中存在主梁變形大的問題,結(jié)構(gòu)顯得單薄,需要進(jìn)行改進(jìn),并需要其強(qiáng)度和剛度的理論分析和支持。 顯而易見,采用經(jīng)典的材料力學(xué)和結(jié)構(gòu)力學(xué)來進(jìn)行分析,將會產(chǎn)生很大的誤差。本文采用板梁結(jié)合的有限元模型解決了分析難題。確定了動載沖擊系數(shù),對該橋式雙梁起重機(jī)的箱型結(jié)構(gòu)主梁進(jìn)行了有限元分析,并對其進(jìn)行了剛度和強(qiáng)度的計算。從其分析的結(jié)果可知,有限元分析與實際測量的結(jié)果誤差率為3.6%,從而可知有限元分析的結(jié)果是可靠的。 在以上基礎(chǔ)上,對主梁進(jìn)行了計算機(jī)有限元仿真加固的四種方案設(shè)計,并進(jìn)行了比較。最佳方案的強(qiáng)度比原梁提高了38.7%,剛度比原梁提高了33.9%。 以上所作的工作為該機(jī)的改造和加固提供了有益的理論參考。
[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.
【學(xué)位授予單位】：遼寧科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2012
【分類號】：TH215

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