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介绍了采煤机运行过程中其机械系统和液压系统常出现的主要故障,以及容易发生故障的主要部位,分析了故障的快速判断方法和检修方法,主要包括铁谱分析法、温度监测法、人工智能诊断法。 相似文献
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《机械科学与技术》2017,(1):23-28
针对机电产品多种故障原因和故障模式并存问题,在常规故障模式及其影响分析(FMEA)基础上,提出了一种改进FMEA与故障传播模型混合故障诊断方法。分析系统常见故障模式及其故障原因,确定每种故障原因对当前故障模式的贡献率;根据故障传播模型进行故障模式推理,计算每种故障模式的发生概率;采用[0,1]区间的概率值来度量故障的严重度和检测度,得到风险扩展数(REN);通过比较每种故障模式的发生概率和REN值,确定系统关键部件及其主要故障模式,为系统维修策略的制定提供理论依据。计算分析结果表明,该方法能有效识别系统的主要故障模式和关键零部件,并与工程实际相吻合。 相似文献
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变压器的故障常被分为内部故障和外部故障两种。内部故障为变压器油箱内发生的各种故障;外部故障为变压器油箱外部绝缘套管及其引出线上发生的各种故障。主要分析变压器运行的检查维护及故障处理的方法,可供广大同行技术参考。 相似文献
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针对某型飞机发生多架次高压油滤固定支座发生的裂纹故障,从产品结构形式、产品材料、使用工况以及安装环境等方面进行分析,得出产品裂纹故障的主要原因为产品固定点凸台高度差和与之连接的导管存在安装应力。通过有限元理论分析验证了凸台高度差和导管安装应力裂纹部位与实际相吻合,找出了故障发生原因,并针对故障原因提出预防和改进措施。 相似文献
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分析了数控机床返回参考点的方式和原理,总结了回参考点的参数设定与挡块位置调试步骤,以及数控机床回参考点故障类型和产生的主要原因,提出了相应的故障诊断方法。 相似文献
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Dong-Hoon Kim Sun Ho Kim Kwang Sik Koh 《Journal of Mechanical Science and Technology》2005,19(5):1095-1106
Recently, the conventional controller of machine-tool has been increasingly replaced by the PC-based open architecture controller,
which is independent of the CNC vendor and on which it is possible to implement user-defined application programs. This paper
proposes CNC-implemented fault diagnosis and web-based remote services for machine-tool with open architecture CNC. The faults
of CNC machine-tool are defined as the operational faults occupied by over 70% of all faults. The operational faults are unpredictable
as they occur without any warning. Two diagnostic models, the switching function and the step switching function, were proposed
in order to diagnose faults efficiently. The faults were automatically diagnosed through the fault diagnosis system using
the two diagnostic models. A suitable interface environment between CNC and developed application modules was constructed
for the internal function of CNC. In addition, a suitable web environment was constructed for remote services. The web service
functions, such as remote monitoring and remote control, were implemented, and their operability was tested through the web.
The results obtained through this research could be a model of fault diagnosis and remote servicing for machine-tool with
open architecture CNC. 相似文献
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Dong Hoon Kim Sun Ho Kim Jun-Yeob Song 《Journal of Mechanical Science and Technology》2005,19(8):1597-1610
The conventional computerized numerical controller (CNC) of machine tools has been increasingly replaced by a PC-based open
architecture CNC (OAC) that is independent of a CNC vendor. The OAC and machine tools with an OAC have led to a convenient
environment in which user-defined applications can be efficiently implemented within a CNC. This paper proposes a method of
diagnosing the cause of operational faults. The method is based on the status of a programmable logic controller in machine
tools with an OAC. An operational fault is defined as a disability that occurs during the normal operation of machine tools.
Operational faults constitute more than 70 percent of all faults and are also unpredictable because most of them occur without
any warning. To quickly and correctly diagnose the cause of an operational fault, two diagnostic models are proposed: the
switching function and the step switching function. The cause of the fault is logically diagnosed through a fault diagnosis
system using diagnostic models. A suitable interface environment between a CNC and developed application modules is constructed
to implement the diagnostic functions in the CNC domain. The results of the diagnosis were displayed on a CNC monitor for
machine operators and transmitted to a remote site through a Web browser. The proposed diagnostic method and its results were
useful to unskilled machine operators and reduced the machine downtime. 相似文献
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数控机床故障诊断与维护是数控机床使用过程中重要组成部分,也是目前制约数控机床发挥作用的重要因素。在阐述数控机床故障分布规律的基础上,分析了数控机床常见的故障模式。剖析了系统故障诊断内容及方法,并提出了提出了相应的维护措施,对于开展数控机床故障诊断与维护的研究具有重要意义。 相似文献
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数控机床是高精度自动化装备,价格昂贵,为了保证机床长期安全平稳运行,发挥更大效益,需要注重数控机床的维护保养方法和易出现的故障及排除方法。 相似文献
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介绍了数控机床自动挟刀装置容易产生的故障及其原因,对故障的排除和日常维护进行了详细地阐述,并举出两个具体维修实例来说明故障分析与排除的基本过程和基本方法。 相似文献
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介绍了了PMC类故障诊断的常用方法,详细阐述了PMC的动态和静态两种诊断法的应用,结合PMC故障实例,通过数控系统的自诊断功能、I/O状态、PMC梯形图及动态跟踪梯形图等方法来判断故障原因,提高了故障诊断的速度和准确性。 相似文献