D07系列质量流量控制器毛细管堵塞的处理方法

D07系列质量流量控制器被广泛的应用到电子、化工、石油、医药、环保等领域的科研和生产中,当其出现故障时我们要有一个好的解决方法,确保生产正常。     

DMA242C动态机械热分析仪故障分析与维护

介绍了DMA242C工作原理、操作条件,并对在使用过程出现的lock\unlock问题,顶杆位移等问题进行了分析和应对,对使用过程中的某些注意事项进行了阐述.     

高压隔离开关更换后二次控制回路存在的问题及解决方法

分析220kV变电站Ⅰ段母线侧隔离开关更换后,送电时Ⅰ、Ⅱ段母线侧隔离开关都不能电动操作的原因,提出解决的方法及注意事项。     

铜合金热轧机AGC系统故障分析及对策

介绍了2辊可逆式铜合金热轧机AGC系统结构原理,并对出现的故障进行分析提出相应对策,提高了AGC系统运行稳定性。     

Thermal malfunction criteria of fire safety electrical equipment in nuclear power plants

Malfunctions of nuclear power plants' (NPP) fire safety electrical equipment may be the consequence of a fire, leading to an increase of temperature and heat fluxes in a room and its adjacent ones. Electrical equipment manufacturers issue a so‐called ‘maximum temperature of normal operation’ under which a continuous function is guaranteed. However, this manufacturer temperature does not correspond to the notably higher real maximum operating temperature. Exactly knowing this temperature has two impacts: adequate selection of fire safety equipment and new fire probabilistic risk assessment (PRA) damage threshold. Those levels are today very conservative for performance‐based design: 40°C for electronic boards and 55°C for electromechanical materials. That is why Electricité de France, Research and Development Division (EDF R&D), performed several tests in the MILONGA facility to investigate the thermal malfunction levels of cabinet equipment classified as ‘Important for Safety’ by

• first defining what malfunction means, according to the material type and its required function;
• defining a relevant and reliable methodology of tests;
• testing a sample of electromechanical materials and electronic boards used in NPP and
• suggesting new temperature criteria for Fire PRA.

Although the equipment behaviour may be dependent upon the materials of construction and equipment layout, the main results are the malfunction temperatures of 130°C for electromechanical materials and 95°C for electronic boards. Copyright © 2012 John Wiley & Sons, Ltd.     

KU250/750外圆磨床液压改装

通过对进口设备液压泵站进行改装 ,利用国产液压元件替代进口液压元件 ,对使用周期长故障多的设备进行技术改造 ,找到设备故障原因 ,制定改造措施 ,解决实际问题 ,使之适应实际生产需要     

汽车底盘故障诊断仪的原理与设计

系统论述了汽车底盘故障诊断仪的基本原理与设计思想。在转速跟踪选频诊断的基础上,该仪器能完成对多种车型底盘传动系的主要部件故障进行现场监测和诊断,并能自动显示诊断结果。大量现场实验证明了该仪器的实用性和有效性。     

110kV“备自投”误动的防范措施及运行维护注意事项

通过对历年来110 kV备自投不正确动作事件的原因分析,总结出目前变电站采取的防止110 kV"备自投"不正确动作的各种改进措施,提出了防止母线TV断线"备自投"误动的建议及运行维护工作中防止"备自投"不正确动作的注意事项,供同行的运行工作者参考。     

莱钢板坯连铸机结晶器国产振动伺服缸长寿命研究与应用

本文针对国产振动伺服缸使用中存在的问题,伺服缸活塞杆漏油、位移传感器密封漏油,伺服缸连接法兰内部工艺孔漏油及端盖处静密封漏油,拿出改进措施使国产振动伺服缸寿命达到了稳定使用要求,为企业降本增效做出了一定贡献。     

数控故障检测与排除训练中电磁制动器故障的设置

文中通过修改数控系统PLC程序,增加对电磁制动器的监控来完善数控设备故障检测与排除的教学功能,防止操作人员因操作不当造成伺服电机损坏,保护了操作人员和设备的安全。