共查询到20条相似文献,搜索用时 265 毫秒
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我厂750初轧机在轧制过程中,对钢锭的移送、翻转等都是由单侧齿条双电机拖动的推床和用差动装置传动的曲柄齿条式的钩式翻钢机来完成。 一、几种误操作 由于操作不当或电控失灵,推床和翻钢机以及轧机在操作时间上的配合失误,导致 相似文献
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无锡钢厂ф750mm初轧机生产105mmx105mm小方坯时采用箱-菱孔型轧制,本文介绍该初轧机菱形坯翻钢机的设计。该翻钢机采用翻钢板式结构,直接装设在推床上,结构简单,同时翻钢机构距轧辊较近,便于菱形坯对准孔型,投产后运行正常,达到了设计要求。 相似文献
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无锡钢厂φ750mm初轧机生产105mm×105mm小方坯时采用箱-菱孔型轧制,本文轧机菱形坯翻钢机的设计,该翻钢机采用翻钢板式结构,直接装设在推床上,结构简单,同时翻钢机构距轧辊较近,便于菱形坯对冷孔型,投产后运动正常,达到了设计要求。 相似文献
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我厂推床翻钢机曲柄轴底座与轴承盖之间采用4根M36×320的双头螺栓联接。由于翻钢机工作时,曲柄轴底座和轴承盖受到很大的冲击负荷作用,常导致双头螺栓松动和断裂。维修人员几乎每班都得对其紧固,每周都得更换几根螺栓。而螺栓断裂后,更换又比较麻烦,因为先得取出断在底座里的那节螺栓。 相似文献
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翻钢机作为钢卷运输线的重要组成设备,其结构特点可适应立式和卧式两种钢卷运输方式.文章对武钢热轧总厂一分厂运输链改造项目中采用的翻钢机的技术参数、结构特点、自动化控制以及联锁进行了阐述,对其他同类设备的改造设计具有一定的指导意义和实用价值. 相似文献
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目前,国内大中型型钢生产使用的翻钢移钢设备有水压式和机械夹钳式两种。长城特钢公司四钢厂初轧车间825轧机机前、机后原使用机械夹钳式翻钢移钢机,但该机长期不能满足工艺要求,主要是夹不紧、翻不转,仍只能靠人工翻钢,劳动条件恶劣,影响产量、质量及扩大产品规格范围(不能进行大断面型钢的生产)。1976年该厂曾委托有关单位设计过水压式 相似文献
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The list of hepatitis viruses is increasing over the years. Now the viruses range from A to G. Hepatitis A virus is a short incubation RNA virus which is transmitted oro-faecally. It does not cause chronic illness but may be fatal in a few cases especially in pregnancy. It can now be prevented by vaccination. Hepatitis B virus is a long incubation DNA virus which is transmitted mainly through blood and blood products. It causes chronic illness and can lead to liver cancer in some cases. It can be prevented by vaccination and WHO is now recommending global vaccination of all infants irrespective of endemicity of hepatitis B virus. Hepatitis C virus is an RNA virus which used to be known as parenterally transmitted non A non-B virus. It leads to chronic illness and can lead to liver cancer. It is now responsible for most cases of post transfusion hepatitis in Europe, North America and Asia. Hepatitis Delta virus is a defective virus which requires hepatitis B virus for its existence. Thus it affects only those who have hepatitis B virus. Hepatitis E virus used to be known as the enterically transmitted non-A non-B virus. It is transmitted oro-faecally and seems not to lead to chronic illness. It is endemic in some areas like Middle East and parts of Africa. Hepatitis G virus is just being described. More information about it will soon be available. 相似文献
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AN Clark 《Canadian Metallurgical Quarterly》1977,23(6):445-451
The clinical and electrocardiographic features of multifocal atrial tachycardia are described and illustrated by nine examples. It is almost entirely seen in later life and is often misdiagnosed as atrial fibrillation. It is associated with a high mortality and the majority of the cases described here reverted to sinus rhythm. Little attention has been so far paid to this important arrhythmia in the elderly in standard textbooks of cardiology. The literature is reviewed and management discussed. It is not a rare supreventricular tachycardia in the aged and many examples may be not diagnosed. It merits further study in relation to unanswered questions. 相似文献
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研制了一种结晶紫PVC膜涂层玻璃电极。它是在普通pH玻璃电极表面涂敷一层对结晶紫敏感的PVC膜构成的。该电极灵敏度高,选择性好,且制作简单,使用方便。它可直接用于结晶紫的测定,也可用于动力学分析方法中。本文用该电极以动力学法测定了标准钢样中的锰含量,结果满意。 相似文献
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介绍了用硅酸亚铁代替铁质原料在硅铁生产中的应用,并取得一定效果,硅酸亚铁应用在硅铁生产中全可行,一定程度上解决了硅铁生产中的铁质原料,工艺创新,具有良好的经济效益和社会效益。 相似文献
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开关量服务器在唐钢无人值守系统中起着重要作用,它功能强大,操作简单。开关量服务器支持设备的输入和输出,在与VSPM软件配合使用中能够应用于很多领域,如汽车磅、轨道衡、车间衡。具有明显的实用性、可靠性和先进性,极大地提高了工作效率,降低了生产成本。 相似文献
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热脏发生炉煤气在蓄热式加热炉上的应用 总被引:6,自引:2,他引:4
概要论述了蓄热式高温空气燃烧技术的特点及国内应用状况,介绍了蓄热式燃烧系统的结构与特点,重点阐述了采用热脏发生炉煤气加热炉的主要技术性能以及蓄热式加热炉供热分配、煤气系统、空气管路系统和排烟系统等设计特点。并且对蓄热式加热炉生产运行中出现的问题,解决措施及生产应用情况进行了分析。实践表明,采用热脏发生炉煤气开发研制的蓄热式加热炉具有高效、优质、节能和低污染等诸多优点,具有广阔的开发应用前景。 相似文献