冷连轧机工作辊轴承烧损原因分析及对策

根据工作辊轴承受力情况，分析了冷思厂五机架工作辊轴承烧损的原因，为减少烧损采取的措施及所获得的效果。     

高线精轧机辊箱烧损分析及改进

精轧机组辊箱油膜轴承烧损一直是高线设备维护的重点和难点,通过近几年对辊箱烧损事故的分析和采取改进措施,实施后解决了问题,提高了辊箱的使用寿命.     

冷连轧机工作辊轴承烧损原因分析及对策

着重分析了冷轧厂五机架工作辊轴承烧损的原因及采取的措施。结果表明，措施得力，效果明显，轴承烧损量比１９９４年下降了８３％。     

铝箔轧机工作辊操作侧轴承烧损原因分析

针对1550铝箔轧机频繁出现工作辊操作侧轴承烧损的现象,对造成工作辊轴承失效的原因进行分析,有针对性地制订出对策及方案,有效地减少了轧机非正常停机时间,消除了设备火灾隐患,保障设备有效运行。     

CERAN HV润滑脂在2050热轧的应用

轧辊轴承是在重载荷、高转速、工作环境很恶劣的情况下工作的.为了避免轴承在轧机上烧损,对轴承正确的维护和润滑是很重要的.而选择何种润滑脂尤为重要.介绍TOTAL复合磺酸钙基脂在2050热轧工作辊轴承上应用的成功事例,详细地叙述了应用的全过程、使用的工具及应用后的经济效益.     

2350铝箔轧机工作辊轴向力测试及止推轴承短寿分析

2350铝箔轧机工作辊止推轴承频繁发生短寿烧损事故,轧机被迫降速运行,严重困扰着企业生产.采用全新直接测量轴向力方案,对2350铝箔轧机工作辊轴向力大小、作用方向及其周向分布进行全面测量,并对测试结果和轴承短寿问题进行分析,指出轴向力产生原因及其组成部分,轴承短寿烧损的主要原因在于轴向力严重偏载和超载.本测试为研究2350铝箔轧机止推轴承延寿治烧问题提供重要实践依据.     

热轧窄带钢JP4，JP5轧机辊系改造

针对JP4，JP5轧机轧辊轴承在轧制薄规格钢带时烧损严重的现象进行分析，对工作辊轴承座、平衡方式、换辊方式等进行改进，从而稳定了设备的运行，降低了生产成本。     

型带材厂轴承使用寿命延长一倍

为降低备品备件消耗,型带材厂带钢线准运作业区瞄准大宗消耗,积极开展攻关,今年以来,型带材厂带钢线在生产过程中,立辊轧机轴承和四辊轧机上支撑辊轴承的平均使用寿命分别达到了轧制50000吨和40000吨钢,两种轴承的平均寿命比去年同期提高50％以上,而且实现了零在线烧损。     

电火花沉积/堆焊技术在支承辊辊颈修复中的应用

液体摩擦轴承在使用过程中,因多种因素造成润滑不充分,引起支承辊辊颈与轴颈套筒产生干摩擦,致使支承辊辊颈烧损,形成多处碳黑区。安钢第二轧钢厂采用电火花沉积/堆焊技术,成功修复了严重烧损的辊颈,节约了生产成本,缓解了支承辊紧张的局面。     

3500中厚板四辊轧机工作辊杆系分析和轴承寿命评估

35 0 0mm中厚板四辊轧机工作辊四列圆锥滚子轴承 ,同时承受径向力和轴向力。其工况为承受上轧辊系的过平衡力 ,或需要板形控制时承受弯辊力 ,以及工作辊受到的轴向力。圆锥轴承已经按照现有轧机设计理论严格选择 ,但短寿烧损状况长期困扰着轧机安全运行。对工作辊辊系机构进行杆系分析 ,确定轴承工作的约束条件。开发梯形板单元模拟圆锥滚子并固接于内环上 ,外环和内环分别贴合于轴承座及轧辊辊颈 ,将多物体接触滚动轴承简化为两物体三维弹性摩擦接触问题 ,适用于三维弹性摩擦接触边界元法 ,获得圆锥轴承三维负荷分布。并针对圆锥滚子轴承同时承受径向载荷和轴向载荷的特点进行改进 ,计算得到的结果更接近实际 ,轴承滚子载荷分布解析更为准确 ,花费时间并无显著增加 ,证明本方法对于圆锥滚子轴承载荷的解析的适用和准确。     

论从实践理解世界的物质性和自然世界的先在性

马克思主义唯物论是一种物本主义形态的唯物论,还是一种超越物本主义形态、从实践理解世界的本质相关问题的实践的唯物主义的唯物论?这是一个我们必须搞清楚的有关马克思主义唯物论的本质规定性和精神实质的重大问题.在考察物本主义的唯物论及其思维方式的局限性的基础上,揭示了马克思主义唯物论是现代的、实践的唯物主义,并重点研讨了马克思主义唯物论关于从实践理解世界的物质性和自然世界的先在性的原理,以期为马克思主义唯物论进一步阐明人类世界的实践性原理奠定基础.     

Effect of cyproheptadine on the ultrastructure of the neurons of the arcuate nucleus in the hypothalamus of the rat

The data are presented on changes in the rat arcuate nuclear neuron ultrastructure after using cyproheptadine (peritol, Egyt Pharmaceutical Works, Hungary) in a water suspension at a dose of 20 mg/kg once daily during 7 successive days and twice a day within 10 days. It was shown that cyproheptadine decreases the functional activity of the arcuate nuclear neurons, depending on the total amount of the drug used. Cyproheptadine-induced inhibition of the forming neurohormone release from neurons is likely to be one of the mechanisms of its therapeutic effect in Itsenko-Cushing's disease.     

Characteristics of the sympathetic innervation of the nictitating membrane and of the vasculature of the nose and tongue of the cat

Vasomotor responses from the nasal mucosa and tongue, and contractions of the nictitating membrane, were recorded on stimulation of the cervical sympathetic or internal carotid nerves. Preganglionic sympathetic nerve fibres which elicited a membrane response possessed a lower threshold than those which evoked nasal vasoconstriction, while the latter displayed a lower threshold than fibres which evoked tongue vasoconstriction. The sympathetic vasodilator fibres to the tongue whose activity was revealed after alpha-receptor blockade, had a similar threshold to the vasoconstrictor fibres. Membrane contraction, nasal vasoconstriction and occasionally tongue vasoconstriction could be evoked by stimulating the internal carotid nerve. The postganglionic fibres innervating the nasal mucosa had a similar threshold to those of the nictitating membrane, which may indicate that there are small myelinated fibres innervating the mucosa. The preganglionic compound nerve action potential had four major components, S1-S4. S1, S2 and usually S3 fibres were associated with membrane contraction; S2, S3 and sometimes S1 fibres were associated with nasal vasoconstriction; and S3, usually S2 and occasionally S1 fibres were associated with vasoconstriction in the tongue. It is concluded that each of these three groups of nerve fibres, but not S4 fibres, may include fibres associated functionally with the three effectors. There was a considerable difference between the relative amplitude of the responses of the three effectors elicited by stimulation of the cervical sympathetic nerve at frequencies between 0.2 and 2 Hz. Vasoconstrictor responses were relatively larger than membrane contractions suggesting differences in the mechanisms of neurotransmission at the neuroeffector junctions.