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在现场使用过程中,锁闭检查器(包括VCC和VPM)表示部分存在绝缘电阻低的问题。通过更换接点材料和对原接点材料进行绝缘处理并结合12个周期交变湿热实验数据分析,提出2种提高道岔锁闭器接点系统绝缘性能的方案。 相似文献
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介绍了快干清漆的研制过程,生产工艺、室内各种性能试验,涂车试验及与其他同种用途的漆种的对比情况,试验表明,轮对和铸钢件采用快干清漆,不仅能改善表面涂装质量,提高防腐能力,而且缩短了干燥时间,节省了工作台位,提高了劳动生产率 相似文献
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Novolacs were successfully synthesized using oxalic acid as the catalyst in a self-designed device based on a domestic microwave oven, The fundamental characteristics of the synthesis of novolacs under microwave irradiation (MI) were investigated, and the properties of the resins polymerized and dehydrated under microwave irradiation and conventional heating (CH) were analyzed comparatively, The results show that MI reduced the polymerization and dehydration time greatly; and that the resins polymedzed and dehydrated under MI presented longer flow distances ( i. e., higher flowability) and shorter cure time than those obtained under CH. 相似文献