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运用机械可靠性设计原理和方法。并结合理化检验对某石油化工企业高压除焦水泵主轴断裂事故进行了失效分析。通过分析,确定了泵轴材料是退火组织,力学性能较差,耐腐蚀性能不佳,易引起腐蚀疲劳,加之断面凹槽的过渡圆角半径偏小,应力集中系数过高,导致轴的可靠度降低。据此,文中提出了相应的改进措施。 相似文献
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35CrMo钢带泵轴断裂原因分析 总被引:1,自引:0,他引:1
35CrMo钢带泵轴在使用约40h后发生断裂,通过宏观断口形貌观察、力学性能试验和金相检验及受力分析等方法对带泵轴断裂原因进行了失效分析.结果表明:带泵轴由于热处理不当造成其疲劳强度降低,服役后发生旋转弯曲疲劳断裂失效. 相似文献
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本文采用宏、微观检验和硬度检测的分析方法,对国产某电动车减速器在台架试验中输入轴发生齿轮断裂进行原因分析,并且与国外生产的同产品输入轴齿轮进行比较。结果表面,国产输入轴齿轮发生断裂为疲劳断裂,产生疲劳断裂的主要原因是由于国产输入轴齿轮齿根位置加工较为粗糙,在齿根位置存在较大的应力集中,而电动车制动能量回收工况对齿根的反复冲击加剧了断齿发生概率,同时齿根位置的大量黑色组织使得齿根位置硬度明显偏低,降低了齿轮的疲劳寿命。 相似文献
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通过对高压贫胺泵轴断裂的原因分析,确定泵轴断裂的主要原因是泵轴的冶炼缺陷所引起的疲劳断裂,据此提出了相应的改进方法。 相似文献
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蒋晔良 《机械制造与自动化》1999,(4)
本文通过电镜、金相显微镜、硬度仪、光谱仪等检测手段,对扬子石化炼油厂输送蜡油泵的断裂轴进行了检测,并对检测结果进行分析,结果表明泵轴断裂属疲劳失效.造成疲劳的主要原因是泵轴的倒角半径R值过小.为此,提出相应的改进措施,效果良好. 相似文献
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某型矿车在经过一段时间的使用后,其铰接轴出现断裂失效现象。通过对断口的宏观观察,并利用有限元软件对其进行了力学分析,结合分析结果与断口的宏观特征,找出了铰接轴断裂失效的主要原因为疲劳断裂,疲劳起源为键槽尾端,并在不改变机架结构的基础上对铰接轴结构进行了优化,经实践检验后使用良好,未再次出现断裂失效事故,为轴类零件的设计和安全评估提供了依据。 相似文献
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228D减速器皮带式抽油机的主减速传动装置,减速器运行3个月发生高速齿轮轴断裂事故。经查找分析表明,该轴结构设计存在带轮悬臂过长、危险截面处弯矩过大、应力集中突出、疲劳强度的安全系数过低等缺陷及材料金相组织存在魏氏体,都是造成断轴原因。最后提出了改进设计措施。 相似文献
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对低压安注泵及安全壳喷淋泵在性能试验阶段反复发生轴套擦痕的成因进行了分析,认为卡套联轴器存在结构问题,轴跳动、动态挠度、振动过大是其造成轴套擦痕的主要影响因素,从制造和设计两方面对泵的改进进行了探讨。 相似文献
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Zhi-Jie Liu Yu-Chong Zhao Zhi-Qiang Gan Dong-Lin Hui 《Journal of Mechanical Science and Technology》2018,32(11):5089-5096
Under changeable pumped medium and working environment, the twin-screw pump is prone to be broken by fatigue failures. A structure optimization design model and method of the driving shaft are presented based on response surface methodology and finite element analysis. In this model, the shaft diameter, chamfering degree and the shaft extension of the power end are selected as optimization variables, the limit values of the variables and maximal normal deformation of the spindle are considered as the constraint conditions, and the minimization of the equivalent alternating stress on the dangerous shaft section is taken as the optimization objective so as to improve the shaft fatigue reliability. The optimization results of a case show that the equivalent alternating stress on the dangerous spindle section reduces by 26.2 %, and the maximal normal deformation decreases by 25.2 % compared with the original design. In addition, the infinite life reliability and fatigue safety factors both meet the design requirements. 相似文献
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Kan Kan Yuan Zheng Shifeng Fu Huiwen Liu Chunxia Yang Xin Zhang 《Journal of Mechanical Science and Technology》2017,31(4):1561-1568
Current research on the stability of tubular pumps is mainly concerned with the transient hydrodynamic characteristics. However, the structural response under the influence of fluid-structure interaction hasn’t been taken fully into consideration. The instability of the structure can cause vibration and cracks, which may threaten the safety of the unit. We used bidirectional fluid-structure interaction to comprehensively analyze the dynamic stress characteristics of the impeller blades of the shaft extension tubular pump device. Furthermore, dynamic stress of impeller blade of shaft extension tubular pump device was solved under different lift conditions of 0° blade angle. Based on Reynolds-average N-S equation and SST k-ω turbulence model, numerical simulation was carried out for three-dimensional unsteady incompressible turbulent flow field of the pump device whole flow passage. Meanwhile, the finite element method was used to calculate dynamic characteristics of the blade structure. The blade dynamic stress distribution was obtained on the basis of fourth strength theory. The research results indicate that the maximum blade dynamic stress appears at the joint between root of inlet side of the blade suction surface and the axis. Considering the influence of gravity, the fluctuation of the blade dynamic stress increases initially and decreases afterwards within a rotation period. In the meantime, the dynamic stress in the middle part of inlet edge presents larger relative fluctuation amplitude. Finally, a prediction method for dynamic stress distribution of tubular pump considering fluid-structure interaction and gravity effect was proposed. This method can be used in the design stage of tubular pump to predict dynamic stress distribution of the structure under different operating conditions, improve the reliability of pump impeller and analyze the impeller fatigue life. 相似文献
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面向核电设备冷却水泵(简称核电设冷水泵)转轴的功能安全评估是减少核电设备安全问题的重要手段之一。针对核电设冷水泵转轴故障突变时功能安全评估问题,提出了一种基于突变理论的核电设冷水泵转轴功能安全完整性评估方法。首先,从核电设冷水泵转轴多传感器监测数据中提取故障特征,故障特征融合结果作为预测参数;其次,采用预测参数构建转轴性能衰退轨迹路径,基于蒙特卡罗方法计算转轴累积失效概率;最后,基于尖点突变理论计算转轴危险失效概率,并评估转轴功能安全完整性等级,并采用核电设冷水泵转轴状态监测数据进行了实验验证。结果表明,当核电设冷水泵转轴存在故障突变时,基于突变理论结合性能衰退状态监测的方法,可以提高核电设冷水泵转轴功能安全完整性评估结果的准确性。 相似文献