管路刚度对精轧机液压回油管振动影响的研究

分析了某钢厂5000mm精轧机立辊液压回油管振动问题,考虑使用改变管路的刚度来解决振动问题,并使用ANSYS CFX软件对这段液压回油管路的一截进行了分析,进行了现场测试,通过仿真和测试共同验证改变管路刚度可以有效地减少回油管振动。     

热锯机减速箱回油装置改进

介绍了唐钢中厚板材有限公司大型型钢热锯机结构,针对热锯机减速箱稀油润滑系统回油不畅,容易造成漏油、振动大等问题,对回油管路做了改进,取消了多根软管的连接装置。采用回油缸形式,解决了减速箱回油不畅的问题,保证了热锯机稳定可靠运行。     

粗轧机平衡液压系统的改进与完善

粗轧机平衡液压系统的设计弊端影响生产顺行，通过在进油管路上增加固定管夹解决了管路振动剧烈的问题；在比例阀后增加1个叠加式节流阀消除了换辊阀组的噪声；改用组合密封和增加导向套，解决了平衡缸端盖密封损坏的漏油事故；设计了更换飞剪剪刃的控制阀组，使更换剪刃的时间由3h缩短到0．5h。改进后，万吨钢误时控制在5min以内。     

热连轧精轧机连接轴润滑系统回油管路改造

针对武钢热轧总厂三分厂现有润滑系统回油管路缺陷,在流量校核满足现场需要的理论基础上,将现有上下主轴集中回油模式改为单独回油模式,并通过管路合理布置避免回油管被下阶梯垫油缸撞坏,从而避免事故发生,节约生产成本。     

酒钢中板定尺剪钢板压紧缸液压系统的冲击分析

本文主要针对酒钢中板厂定尺剪钢板压紧缸液压系统经常出现冲击抖动、管路泄漏,甚至造成胶管涨裂这一严重影响系统的稳定性和安全性的现实问题,从液压冲击的产生机理出发,有针对性地进行具体的理论分析,证明该设计在耐冲击性方面存在明显的不足之处,并提出改进措施。现场实践证明很好地解决了这一问题。     

液压AGC系统高压管路漏油的原因分析及对策

针对鞍钢中板厂2450四辊轧机液压AGC系统高压管路使用中频繁出现的漏油问题，介绍了液压AGC系统的组成和使用情况，以及使用中存在的管路振动大，焊口多次损坏造成的问题，提出了改进方法并进行了实施，取得了很好的效果。为液压系统使用中漏油的防冶，减少火灾隐患等提供了借鉴。     

钢轨打印机液压系统的分析及改进

文章对钢轨打印机液压系统存在漏油的问题展开分析,结合现场的使用情况,通过详细的计算分析出此液压系统L油管的设计存在缺陷,找到了液压系统漏油的根本原因,并针对此缺陷提出了解决方案,为液压系统内伺服阀配置单独的L油管线,保证新加的L油管线回油压力基本为零,从而解决了困扰多年的打印机液压系统漏油的问题。     

某高线轧机液压马达驱动系统故障分析

针对某高线轧机液压马达驱动系统在运行试验时出现的马达油封损坏现象进行了分析,通过现场调试、改进,以及马达运行数据计算的结果得出,液压控制原理、马达的选型、回油管径的选择及铺设,都会影响到整个液压马达系统的使用性能。给出了设计注意事项和解决办法。     

济钢宽厚板厂5000t压力矫直机的应用

针对压力矫直机使用过程中出现的机架刚性低、钢板矫直后回弹、主液压缸漏油不能保压造成矫直力不足等问题,通过计算预应力确保机架刚性,采取主液压缸防偏载设计、液压系统压力和速度分级控制等措施,解决了漏油问题,确保了矫直效果。     

高速连铸结晶器液压伺服振动系统

针对高速连铸结晶器振动的特点,为实现结晶器液压振动提供理论依据,以实验模拟装置为基础,建立其非正弦振动及液压伺服控制系统的数学模型,利用仿真软件包对其进行计算机模拟仿真,分析利用液压伺服系统实现非正弦振动的可行性及伺服系统的动态性能。仿真结果表明,该机构利用液压缸实现振动点的非正弦振动是可行的;其液压伺服系统具有较好的动态性能。     

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。     

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。     

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.     

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。     

Comparison of the results of surgical and conservative treatment of fractures of the diaphysis of the tibia

In this paper is treated the fundamental problematic of the fracture of the diaphysis of the tibia and the therapeutic results after the conservative and operative treatment are confronted. Among 518 patients with 433 open fractures and 35 with closed fractures of the diaphysis of the tibia, successful treatment of more 2/3 was obtained in the period from 1968 to 1972. Following our casuistics and literature, whose results are similar, we find out that the average total treatment of the osteosynthesis of the fracture of the diaphysis was shortened for 2,5 months depending upon the type and the localisation of the fracture. Apolied methods of the operative and conservative and conservative treatment in relation to the velocity of the medical cure as well as to the extreme anatomical-functional results are analised. We noticed that osteosynthesis, made by the intermedullary nail and the extension of the canals or by a small AO table, by the achieved stability makes conditions of immediate motions and an early rehabilitation. Because of that it gives the best functional results.