废钢铁加工与设备

正(接上期)第四章废钢剪切设备第二节门式液压剪切机6、推料机构安装在料箱最下层,用于将料箱里的"腊肠型"废钢柱体推送至剪口以便剪断。图4—36、图4—37、图4—38是推料滑块及其油缸在料箱外部的运动状态示意图。图4—39图、4—40、图4—41料箱里的推料滑块在液压油缸作用下的运动状态示意图。     

带钢切头收集装置

苏联阿穆尔钢厂在飞剪后面安装丁一台专用装置,用来收集不合格的带钢。因为轧制冷弯钢材用带卷的两端有镰刀弯,而且运送时未切边,每卷前端长约2米是在飞剪上切边,然后人工从辊道取下。现采用这种由拔料机(由气缸带动)、坡道和料筐组成的专用装置,操作工在控制台启动气缸(气缸杆与拔料机相连),拔料机即向前移动,将带钢沿坡道从辊道上收入料筐内。这样,不仅无需人工收料,而且年收益约500卢布。     

立推式铝扁锭加热炉的发展及新技术的应用

本文简要论述了立推式铝扁锭加热炉的发展现状,介绍了传统形式的加热炉和新型加热炉各自的特点,着重介绍了新型喷流加热立推式加热炉的设备组成、性能特点,详细论述了自润滑料垫、测料温热电偶装置、迎风燃烧混合方式等新技术的开发并在加热炉上的应用,分析了立推式铝扁锭加热炉的发展趋势.     

冷床上料系统双槽上卸钢装置的改造

济南钢铁总厂针对２５０ｍｍ半连轧机原冷床上料系统存在的问题进行了技术改造，将双槽推料改为单槽推料，并优化控制系统，简化设备结构，提高了工作效率，满足了半连轧机后面配６５ｍ超短冷床实现高速、无间隙轧制的生产要求。     

三辊轧机推料小车的电气控制

介绍了直流调速控制器在三辊行星轧机推料系统中的应用。通过开关量输入信号实现对西门子6RA70直流调速控制器张力与速度控制模式的切换,达到用单台直流电机控制推料小车的目的。这种方法实现简单,经济方便,同时保证设备稳定可靠的运行。     

冷床双槽上卸钢装置的改造

５０年代从捷克引进的２５０半连轧机冷床上料系统双槽推料改为单槽推料，优化控制系统，简化设备结构，提高工作效率，适应了半连轧机后配６５ｍ超短冷床实现高速、无间隙轧制的生产要求。     

宝钢2号高炉无料钟炉顶设备安装调试中出现问题的处理

本文主要对宝钢2号高炉无料钟炉顶设备安装调试和试生产初期所发生的料罐拼装焊缝退火、水冷齿轮箱充N_2漏水及上密封阀不动作等问题进行了分析,阐述了采取的相应措施,以供我国大型高炉无料钟炉顶设备进一步国产化借鉴和参考。     

原料场堆料条喷淋降尘装置设计

分析了原料场推料机喷淋作业中存在问题,介绍了原料场堆料条喷淋降尘装置的设计要点及结构形式。该装置能跟随堆料机作业,同步连续地对料堆给予喷淋,从而达到降尘的目的。     

WH-800离心机不推料故障分析判断

针对WH-800离心机出现的不推料故障,进行了系统分析、判断,经过检修,使离心机恢复了正常作业。     

高温真空铝钎料被授予国家发明专利

<正>近日,由中国航天科工二院201所研制的高温真空铝钎料通过了国家专利局的最终审核,被授予国家发明专利。该钎料除保持一般高温铝钎料流动性好、耐蚀等特点外,最大的特点是采用自主研发的长效变质剂对钎料中的硅进行变质处理。处理后的钎料塑性大幅度提高,特别是变质剂使焊缝中的硅仍处于变质状态。因此,采用该钎料焊接的结构件在保持     

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.