【摘要】：礦用挖掘式裝載機是礦井開采中使用較多的一種開采設備本論文涉及的某款ZWY型裝載機，在使用過程中，其工作裝置發(fā)生了斷裂，故有必要找出工作裝置開裂的原因，并以此為依據(jù)對其進行結構改進與優(yōu)化 本文首先對典型工況下的工作裝置進行了有限元靜力學分析，考慮到大臂小臂和底座受力復雜且邊界條件難以確定，單獨分析比較困難，本文以整個工作裝置為研究對象進行分析計算由分析結果可知，小臂和底座存在明顯的應力集中，其發(fā)生部位與現(xiàn)實斷裂部位完全吻合，表明小臂和底座的斷裂主要是由局部強度不足引起的，同時發(fā)現(xiàn)大臂整體受力較小且應力分布不均勻，存在較大的優(yōu)化空間 其次，本文運用Optistruct求解器對工作裝置分別進行了拓撲優(yōu)化尺寸優(yōu)化形狀優(yōu)化和聯(lián)合優(yōu)化，各個優(yōu)化設計的目標雖然有所不同，但其最終目標都是在滿足裝載機剛強度的設計要求下，盡可能地實現(xiàn)結構的輕量化，通過優(yōu)化，工作裝置最大應力和整體重量均下降幅度明顯 最后，為了解優(yōu)化后工作裝置動態(tài)性能的變化，對優(yōu)化前后的大臂和小臂進行了模態(tài)分析由分析結果發(fā)現(xiàn)，優(yōu)化后的大臂第一階固有頻率較優(yōu)化前大幅度降低，表明大臂經優(yōu)化后動態(tài)性能下降明顯，，故對大臂進行了以提高第一階固有頻率為目標的二次優(yōu)化經第二次優(yōu)化后的大臂，第一階固有頻率提高程度明顯 通過本論文的研究，找出了ZWY型裝載機工作裝置斷裂的原因，并對其結構進行了改進與優(yōu)化，優(yōu)化后的工作裝置，靜動態(tài)性能都有顯著的提高本論文的研究能為其它同類型產品的設計提供一定的指導意義
[Abstract]:Mining excavating loader is a kind of mining equipment which is used more frequently in mine mining. In the process of using, the working device of the loader is broken, so it is necessary to find out the reason of the cracking of the working device. Based on this, the structural improvement and optimization are carried out. Firstly, the finite element statics analysis of the working device under typical working conditions is carried out, considering that the force on the forearm and the base is complex and the boundary conditions are difficult to determine. It is difficult to analyze alone. In this paper, the whole working device is taken as the object of study. According to the results of the analysis, there is obvious stress concentration in the forearm and the base, and its occurrence position is completely consistent with the actual fracture site. The results show that the fracture of the forearm and the base is mainly caused by the insufficient local strength. At the same time, it is found that the overall stress of the arm is small and the stress distribution is not uniform, and there is a large space for optimization. In this paper, the Optistruct solver is used to optimize the size and shape of the working device respectively. Although the objectives of each optimization design are different, the final goal is to meet the design requirements of the loaders' rigid strength. By optimizing, the maximum stress and the overall weight of the working device decrease obviously. Finally, in order to understand the dynamic performance of the working device after optimization, Modal analysis of the upper arm and the lower arm before and after optimization. The results of modal analysis show that the first natural frequency of the optimized arm is significantly lower than that before the optimization, which indicates that the dynamic performance of the arm decreases obviously after the optimization. Therefore, the second optimization of the upper arm with the aim of improving the first order natural frequency is carried out, and the degree of the first order natural frequency is obviously improved through the research in this paper. The reason of the breakage of the working device of ZWY loader is found out, and its structure is improved and optimized. The study of static and dynamic performance can provide some guidance for the design of other products of the same type.
【學位授予單位】：武漢科技大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TD422.3

【參考文獻】

相關期刊論文 前10條

1 石沛林;徐冠林;張立榮;;ZL50型裝載機鏟斗的應力分析與結構優(yōu)化設計[J];工程機械;2008年06期

2 王自勤;計算機輔助工程(CAE)技術及其應用[J];貴州工業(yè)大學學報(自然科學版);2001年04期

3 蔣建新;斗桿體軸套焊縫部位早期斷裂原因剖析[J];廣西機械;2002年02期

4 羅震,郭文德,蒙永立,陳立平;全柔性微型機構的拓撲優(yōu)化設計技術研究[J];航空學報;2005年05期

5 鐵巍巍;王曉楓;楊茹萍;周雍;;挖掘機動臂有限元模態(tài)分析[J];機械設計與制造;2011年03期

6 陳祥;劉辛軍;;基于RAMP插值模型結合導重法求解拓撲優(yōu)化問題[J];機械工程學報;2012年01期

7 隋允康;宣東海;尚珍;;連續(xù)體結構拓撲優(yōu)化的高精度逼近ICM方法[J];力學學報;2011年04期

8 曲令晉;史亞貝;;基于靈敏度的重型卡車車架優(yōu)化設計的研究[J];汽車零部件;2010年09期

9 史青錄;連晉毅;林慕義;;挖掘機最大理論挖掘力的確定[J];太原科技大學學報;2007年01期

10 譚明敏;楊務滋;周立強;胡江平;劉明濤;;挖掘機式沖擊器斗桿有限元模態(tài)分析[J];中南林業(yè)科技大學學報;2011年04期

本文編號：2391507