变速箱轴承早期失效分析及解决措施

介绍了变速箱轴承早期失效形式,分析了变速箱轴承早期失效的原因,提出避免轴承早期失效的措施。为了使轴承具备良好性能,正确选用和合理使用轴承十分重要,要从轴承的加工、包装、装配、润滑、保养以及与轴承配合零件的质量等多环节进行提升。     

带液压制动器的多级行星齿轮减速器在新型特大型三辊卷板机？…

本文介绍一种新型齿轮箱一多级行星齿轮箱，和一般卷板机比较，它的驱动结构简单，这种齿轮箱易于制造、传动性能良好。     

某机床振动噪声测试及分析改进

阐述影响机床主轴箱噪声的因素,通过振动信号测试和噪声测试,根据频谱图尖峰频率的主要成份,结合特定转速下啮合频率的计算值,识别了主要噪声源,并提出在变速箱齿轮传动结构设计中应重视的问题,尽可能保证啮合频率不重合,有效降低噪声水平。     

基于VMD-DE的坦克行星变速箱故障诊断方法研究

为了提高坦克行星变速箱齿轮故障模式识别准确率,将变分模态分解(VMD)与散布熵(DE)结合提出故障特征提取新方法。利用波形法确定VMD分解层数,VMD分解振动信号得到一组固有模态分量(IMF);根据归一化互信息准则筛选若干IMF重构信号,计算重构信号的散布熵;将重构信号散布熵作为特征值输入到粒子群优化(PSO)的多分类支持向量机(SVM)中实现故障模式识别。通过对坦克行星变速箱的正常、行星轮故障和太阳轮故障三种状态进行模式识别,分类准确率达到100%,且计算时间较短。与基于原始振动信号DE、VMD-SE(样本熵)、VMD-PE(排列熵)及EMD-DE(经验模态分解与DE结合)等方法比较,综合考虑准确率和计算时间两个因素,基于VMD-DE的方法故障诊断性能最佳。     

Effect of preventive maintenance intervals on reliability and maintenance costs of wind turbine gearboxes

As many of the installed wind turbines (WTs) get older or approach their design life, there will be a drive to keep extending the lives of the main components especially the gearbox. The challenge of operations and maintenance will potentially be even more as there will be a need to keep the cost to a minimum. Similarly, as years of experience of operating WTs accumulate, knowledge about the behaviour and failure of subsystems is gained as well. Also with good documentation and repository of historical operational, performance and failure data, future decisions of operations and maintenance can be taken on the basis of insights from past experience. This paper presents an approach for implementing preventive maintenance (PM) by using historical failure data to determine the optimal PM interval required to maintain desired reliability of a typical module or subassembly. This paper builds upon previous research in the area of WT gearbox reliability analysis and prediction, taking it further by examining the relationships between the frequency of a PM task and the reliability, availability and maintenance costs. The approach presented demonstrates how historical in‐service failure data can be used in PM task selection based on the minimum maintenance cost and maximum availability. Available historical field failure data of the high speed module of a Vestas 2MW WT gearbox is used to validate the approach and show its practicality. The results of this study are then presented—indicating that choosing the right PM interval based on the minimum unit maintenance cost and maximum availability also improves WT gearbox reliability. Copyright © 2014 John Wiley & Sons, Ltd.     

某变速箱轴承失效分析

6306变速箱轴承在使用546h后发生振动和噪声增大现象。经过故障特征、理化分析后发现,轴与内套配合过松、使用过程中系统润滑不到位是导致出现以上问题的原因。     

变速器生产车间布局设计与仿真优化技术研究

车间布局是生产系统的重要组成部分,其优劣程度直接决定了企业的生产效率和产品质量,是企业长期有效运营的关键所在。以G公司DCT变速器车间生产线布局为设计研究对象,根据投产数据计算出生产节拍、所需工作站数及设备数量。结合系统布置设计(Systematic Layout Planning,SLP)理论对车间布局及车间物流系统进行系统的分析,设计出了生产车间平面布局。应用Em-plant软件将车间布局进行仿真建模、模型导入及仿真运行。通过仿真结果分析,优化了布局设计,最终得到较优的生产车间布局。     

高炉水冷齿轮箱维护与保养

高炉水冷齿轮箱是高炉生产中的重要设备之一,齿轮箱的维护与保养尤为重要,文中对齿轮箱的保养步骤进行了介绍,以确保齿轮箱在生产中达到应有的性能.     

基于油液监测技术的推土机变速箱故障诊断

联合应用理化性能分析、铁谱分析和原子光谱分析等多种油液监测分析技术,对SD22型推土机变速箱进行状态监测和故障诊断。根据监测所得的润滑油本身信息和油液中磨粒的形状、大小、数量及种类,确定变速箱合理的换油时间;根据润滑油中铁、铜元素含量超标,判断出变速箱中的摩擦片或轴承保持架磨损较为严重,需要停机检查。     

电机轴电流分析与齿轮箱轴电流防范

介绍了轴电流产生的原因和解决方案。对马钢高速线材16#预精轧机案例进行了分析。实践证明,轴电流不仅影响电机轴承,更会造成轧机齿轮箱轴承损伤。