液压挖掘机斗杆疲劳台架试验方法研究

发布时间：2018-06-25 18:25

本文选题：液压挖掘机 + 斗杆　；参考：《长安大学》2017年硕士论文

【摘要】：近些年,随着国家加大对高铁、公路和桥梁等大型基础建设的投资,国内市场对大型土方设备的需求量大幅增加。但据了解,国内大型土方设备的供求关系仍是供大于求,导致在各个细分市场仍存在激烈的竞争。提高产品质量成为占据市场的重要因素。通过查阅相关的资料,国内关于土方设备的载荷谱测试及其后续的疲劳可靠性研究相对欠缺。本文是继载荷谱测试之后关于SWE350型液压挖掘机斗杆的疲劳试验台架进行研制,通过疲劳试验获得斗杆的破坏形式,为该型挖掘机斗杆进行技术改造提供依据。本文以SWE350型液压挖掘机作为研究对象,根据理论计算挖掘机工作时,该型液压挖掘机铲斗-斗杆销轴处所受到的最大力。介绍实际测试系统,实测挖掘机工作时斗杆上相关部件的受力,验证理论计算挖掘机斗杆受力方法的准确性,为编制斗杆疲劳试验的加载载荷谱提供理论依据。根据现有试验条件和实测结果,推算该型挖掘机斗杆在进行疲劳试验时的加载载荷谱,设计满足试验强度的斗杆疲劳试验台架。以实测结果得到载荷谱的试验最大力,根据现有的试验条件设计试验台架。根据静力学和动力学分析结果,获得SWE350型液压挖掘机的斗杆进行疲劳试验的基本方案。确定合适的加载频率,力求在短时间内获得该型挖掘机的破坏形式,加快该型挖掘机的斗杆发生破坏,便于进行后续的分析和结构优化。建立该型挖掘机斗杆和疲劳试验台架的三维模型,利用相关软件对其进行静力学和动力学分析,得到其仿真云图,并参照各关键部件的材料性能参数评估疲劳试验的安全性和可靠性。
[Abstract]:In recent years, as the state has increased investment in large infrastructure such as high speed rail, highway and bridge, the demand for large earthwork equipment has increased greatly in the domestic market. However, it is understood that the supply and demand of large earthwork equipment in China is still larger than the demand, resulting in fierce competition in the various segments of the market. The important factor of the field. By consulting relevant data, the load spectrum testing of earthwork equipment and the follow-up fatigue reliability research are relatively deficient in China. This paper is a fatigue test bench for the bucket rod of SWE350 hydraulic excavator after the load spectrum test. This paper takes the SWE350 hydraulic excavator as the research object. According to the theoretical calculation, the maximum force of the bucket bucket shaft pin shaft of the hydraulic excavator is calculated according to the theory. The actual testing system is introduced, the force of the related parts on the bucket of the excavator is measured, and the theoretical calculation is verified. The accuracy of the force method of the bucket rod of the excavator provides a theoretical basis for compiling the load spectrum of the bucket bar fatigue test. According to the existing test conditions and the measured results, the load spectrum of the bucket rod in the fatigue test is calculated and the test bench is designed to meet the test strength. The test results are used to get the test of the load spectrum. According to the existing test conditions, the test bench is designed according to the existing test conditions. According to the static and dynamic analysis results, the basic scheme of the fatigue test of the bucket rod of the SWE350 hydraulic excavator is obtained. The appropriate loading frequency is determined, and the broken form of the excavator is obtained in a short time and the bucket rod of the excavator is broken up. It is easy to carry out subsequent analysis and structural optimization. A three-dimensional model of the bucket rod of the excavator and the fatigue test bench is set up. The static and dynamic analysis of the statics and dynamics is carried out by the related software, and the simulation cloud map is obtained, and the safety and reliability of the fatigue test are evaluated with reference to the material performance parameters of the key components.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU621

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