钢卷步进梁运输机组设备设计要点

介绍钢卷运输步进梁机组的特点和设计时设备选型要点。分析步进梁基本原理和结构类型,结合具体工程对步进梁优化设计,阐述步进梁的设计计算过程。分析步进梁在升降过程产生的水平偏移量。同时对步进梁设备速度控制要点进行优化,对类似项目的建设和设计具有一定的借鉴作用。     

济钢热连轧厂步进梁液压系统故障分析

本文对济钢热连轧厂2#步进梁的结构、液压控制原理进行了介绍,重点分析了投产以来2#步进梁升降系统发生的一些故障及分析处理的方案.并介绍了对2#步进梁升降系统实施了改造,改造后设备运行稳定.     

PLC步进梁钢卷自动对中控制系统

ＰＬＣ步进梁钢卷自动对中控制系统皮佑国（惠州大学电子系惠州５１６０１５）１步进梁式钢卷运输机简介步进梁式钢卷运输机是６０年代出现的一种先进的钢卷运输机械，如图１所示。活动梁的动作过程如下：１）钢卷在固定梁上存放着，活动梁处于最低位置；２）升降缸外伸，...     

偏心轮式升降步进梁升降运动分析

偏心轮式步进梁因为液压缸铰点随着动梁移动,而使得其运动过程和负载分析变得复杂,分析了偏心轮式步进梁升降过程,给出了计算模型,并分析了参数C对步进梁提升量、步进梁提升能力的影响。为步进梁设计提供了设计依据。     

步进梁式加热炉断梁事故分析及处理

针对步进炉在生产过程中升降梁发生严重断裂事故,通过对液压驱动和控制系统及升降框架钢结构载荷力学性能的分析,找出了断梁的原因,并对断裂升降框架梁进行现场修复处理。     

步进梁在钢卷运输中的应用及其设计

对常见钢卷运输设备的特点进行分析比较,分析了步进梁的基本原理和结构类别,结合具体工程对步进梁进行了优化设计,详细阐述了步进梁的设计计算过程,并给出偏心轮步进梁的升降轨迹原理和理论计算过程,以及工程应用中的简化设计方法,可指导相关的工程设计。     

钢卷步进梁输送机应用及其参数设计

系统地介绍了钢卷步进梁设备特点和应用、工作原理以及结构设计选型和主要参数选择计算;同时对步进梁的电气控制和如何优化设计也进行了阐述.对轧钢和带钢处理线的机组设计中输入输出设备的方案选择以及步进梁设备的方案设计和基本设计都具有一定的指导和实用价值.     

大圆坯加热炉步进梁平移故障分析与对策

针对步进梁式加热炉在满负荷承载?600大圆坯时出现步进梁平移缸溜车现象进行了原因分析,并提出采用电气控制方法弥补液压设计缺陷的对策,解决了步进梁溜车问题。     

安钢冷轧1550mm连退步进梁升降液压系统故障分析与改进

通过对安钢冷轧连退线步进梁升降液压系统原理的分析,通过改变液压回路中二通插装阀控制盖板的形式,把回油节流调速回路改造成进油节流调速回路,从根本上解决了步进梁上升速度不可调以及系统压力下降的故障。     

TRT机组作动器漏油的原因及解决措施

针对TRT发电机组作动器漏油造成频繁停机的问题,在安装导向圈、曲柄滑块时,采取接触面涂抹二硫化钼、机壳与承缸之间增加硅橡胶密封等改造措施,缓解了作动器的漏油情况,确保了机组稳定运行。     

转炉炉壳热应力分析

根据实际转炉建立实体模型。以有限元为手段,考虑了炉衬和炉壳材料的物性参数随温度变化的特点和炉衬与炉壳之间膨胀间隙,计算了转炉炉壳在温度载荷和炉衬膨胀压力同时作用下的热应力。所得结果可为转炉炉壳设计提供依据。     

焦炭热性能指标意义浅析

通过对焦炭在高炉内的历程及其变化规律的剖析,阐述焦炭热性能指标的意义,形象地把焦炭在高炉内的损耗分为三部分(M1,M2,M3)。指出M2对焦比及焦炭价格有一定的指导作用。     

Results of treatment of cancer of the cardia

Cancer of the cardia is traditionally discussed with cardiac cancer of the lower portion of the esophagus and upper gastric cancer invading the esophagus, and the specific characteristics of cancer of the cardia have never been clearly defined. We reviewed the outcome of 172 patients with adenocarcinoma of the cardia who had undergone radical surgery between 1949 and 1994 in the Division of Gastrointestinal Surgery of the Cancer Institute Hospital. The centers of the tumors were located within 2 cm above and below the boundary between the esophagus and the stomach, and their longitudinal diameter was less than 8 cm. We divided the patients into an early period (1949-1979; n = 79) and a late period (1980-1994; n = 93), and focused on the historical transition. There were no differences in patient gender or histology between the two periods. However, the late period was associated with fewer cases of esophageal invasion and shorter longitudinal diameter, as the age of the population advanced. The number of advanced cancers such as the localized and infiltrative type had decreased, and early cancer and early clinical stage had become more common, but despite the fact that the number of early cancers had increased, extended dissection, such as thoracic and paraaortic lymph node dissection, was performed more frequently. By clinical stage, the long-term outcome markedly improved in Stage I patient in the late period, and tended to improve in Stage II and III patients. This appears to have been attributable to the prevention of micrometastasis by extended dissection, although the number of early cancers is another major potential cause. There were no differences in the outcome of Stage IV patients between the two periods, and further advances in multimodality therapy must be awaited. The range of resection is basically proximal gastrectomy, and if there are adequate indications, the prognosis is favorable. In view of the status of lymphatic flow and lymph node metastasis, and long-term results, lateroaortic lymph node dissection is important. Since the number of early cancer patients has been increasing, if intraabdominal recurrence is prevented, intrathoracic lymph node dissection will contribute greatly to the outcome of such patients.     

The effect of amount of possession of the trait of hostility on accuracy of perception of hostility in others.

Some theories of personality hold that an individual's perception of others is influenced by his own personality characteristics; more specifically, that a trait of low social value will be projected more into others, and that insight into the possession of these characteristics reduces this distortion. These 2 hypotheses were tested by having a group of college students rate each other (including themselves) on degree of friendliness or hostility. Agreement with group rating about self yielded the insight score. In general, the hypotheses were supported; the "friendly" Ss were most accurate in their perception of others, and insight was positively associated with accurate perception. From Psyc Abstracts 36:04:4HL16M. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Comparison of rates of infection of two methods of emergency ventricular drainage

The rates of infection of two methods of external ventricular drainage in use at Atkinson Morley's Hospital--namely, (a) percutaneous drainage with Rickham reservoirs and (b) tunnelled ventriculostomies--were compared in this retrospective review. Percutaneous drainage of CSF with Rickham reservoirs was associated with a 27% rate of infection as identified by positive microbiological cultures; tunnelled ventriculostomy catheters had a 10% infection rate. The difference in the infection rate between the two methods was statistically significant (P < 0.015). Other variables examined, including the age and sex of the patients and the reasons for ventricular drainage, were not associated with an increased rate of infection. Most infections from either method were caused by a coagulase negative staphylococcus. The average duration of ventricular drainage before identification of positive cultures was 5.7 days for Rickham reservoirs and 6.0 days for ventriculostomies.     

浅析《野草》的版画特征

鲁迅先生一生热爱美术作品,对版画中木刻兴趣尤甚.<野草>作为其"写心之作",亦呈现出一些与木刻版画一致的审美特征:一是具有木刻版画的色彩特征,多对比、多冷色,有阴郁的美感;二是具有木刻版画的力度特征,环境描写、人物刻画处处刀锋毕现,遒劲有力,有一种"力之美".     

四辊破碎机车刀架的改造

针对四辊破碎机车刀架车削中存在的几个问题,详细介绍了电动车刀架的结构和工作原理,建立主要设计参数的数学表达式,并进行适当的分析。改造后,这种电动车刀架运行平稳、可靠、方便、省力,取得了预期的效果。     

Effect of antibiotics of chemotaxis of human leukocytes

The effect of 20 different antibiotics on chemotaxis by human neutrophils was studied. Human leukocytes incubated with chloramphenicol, rifampin, sodium fusidate, and tetracyclines in vitro showed markedly depressed migration. The mechanisms by which these antibiotics affect leukotaxis are discussed.