鼓形齿式联轴器的安装

在机械传动安装过程中,联轴器主动端与被动端的同轴度装配精度直接影响着机械传动的平稳性,以及联轴器的使用寿命,是十分重要的环节。联轴器的安装根据设计工艺及精度要求严格。本文以隔膜泵上鼓形齿式联轴器为例,叙述了鼓形齿式联轴器的设计要求、检查及安装步骤,介绍了外齿轴套的热装配及其加热温度的计算方法,找正时最常见百分表精确找正法,以及在安装过程中的注意事项。     

隔膜室盖联接螺栓预紧力的有限元分析

以隔膜泵液力端隔膜腔与隔膜室盖的联接螺栓为研究对象,通过预紧力单元法模拟螺栓预紧力的加载方法,采用有限元软件ANSYS分析预紧力单独作用与预紧力及外载荷同时作用的情况,并进行隔膜室螺栓的接触分析,得出分析隔膜泵螺栓联接能力、预紧效果及失效原因的理论依据。分析结论对料浆输送主要设备隔膜泵联接螺栓的设计制造、安装调试与维护检修具有参考意义。     

隔膜泵动力端减载系统的设计与分析

隔膜泵是管道化输送固液两相介质的核心设备。随着相关行业对产能需求的不断提高,对隔膜泵的流量和压力也提出更高的要求。进而影响隔膜泵整体设计尺寸,提高设计加工难度,提高成本。本文提出了一套用于降低隔膜泵动力端吨位的减载系统。通过本系统可以降低动力端吨位要求。采用理论和流固耦合仿真手段验证了该系统的可行性,并针对影响系统性能的两个重要参数压力和串管流速进行了着重分析,得出了腔内压力变化规律,明确了串管管径的设计方法。本系统的提出对隔膜泵大型化具有重要意义。     

电(干心)应加热装配重型部件

矿山生产所使用的设备大多是大型设备。轴与孔之间多采用热装配。过去,一般都采用柴烧、油煮,焦炉加热处理,终因温度不易控制,部件受热不均匀,而产生变形、表面起氧化层、退火甚至开裂等现象。装配质量难以保证;操作条件恶劣、劳动强度大、不安全;费工费时、成本高。因此,热装配是检修安装重型部件的难题。     

双缸双作用隔膜泵动力端关键件的强度分析与评价

双缸双作用隔膜泵是煤化工领域水煤浆输送的关键设备，双缸双作用隔膜泵动力端主要由主动轴和皮带轮等关键部件所组成，这些关键部件能否满足强度要求不仅是泵设计人员应主要考虑的问题，也是隔膜泵在用户现场安全、稳定运行的关键因素。本文应用大型有限元分析软件ANSYS对动力端关键部件按实际工况进行强度分析并对分析结果进行评价，其结论对隔膜泵动力端相关部件的设计研发具有一定的理论指导意义。     

隔膜泵动力端结构改造研究

隔膜泵是远程料浆输送设备工艺系统中的"心脏"设备,特别是高磨蚀、高浓度固液两相介质的长距离管道化输送系统中,更是其他泵类无法替代的,隔膜泵结构简单、坚固耐用,大部分的加工件难度较低,易于操作;动力端是整个隔膜泵技术难点最多的部件,其中包括了曲轴、连杆、活塞缸、十字头等相对精密的零件,特别是曲轴一般较大,需要特定的设备才...     

改善堆取料机取料斗轮减速机锥齿轮副装配质量的讨论

分析堆取料机取料斗轮减速机输入轴与二级锥齿轮轴的故障原因,针对检修装配方案中的弊端,指出在检修装配过程中,应合格调整轴承游隙、齿轮侧隙以及接触区,以提高装配调整质量,提高了设备运转率.     

转炉倾动机构连接座销轴安装方式的改进

文章针对原转炉倾动机构上、下连接座关节轴承处销轴安装方式,通过销轴的理论计算,采用冷装与热装相结合的方式,很好地改变了这一传统安装方式,解决了这一安装难题,达到了装配技术要求。     

隔膜泵曲轴装配V型托辊的设计

隔膜泵的曲轴装配一直是装配的难点,我公司是利用V型托辊来实现曲轴的装配.这种装配方法是通过V型托辊在保证支撑的同时还能使曲轴绕轴线转动,使连杆顺利安装,从而完成曲轴的装配.这样既提高了装配精度,又提高了效率,符合现代化生产的需求.通过现场的反馈,V型托辊的设计和使用取得了良好的效果.     

十字头工艺设计

十字头是隔膜泵、发电机、压缩机等设备的关键件,零件结构复杂、精度要求高等特点。在制造过程中,合理的工艺设计决定零件的使用寿命。本文以隔膜泵上45t动力端十字头为研究对象,通过对零件图纸及其技术要求分析,结合公司内部现有加工设备初步设计其加工工艺方案,计算各工艺方案加工工时及成本,对工艺方案进行分析比较、选择合适工艺方案制定工艺路线,并根据加工设备合理选用刀具、切削用量,结合现场实际操作完成了十字头的加工工艺,同时该工艺在现场操作中加工的十字头达到图纸设计要求,为相似零件的制造提供了工艺设计参考。     

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.     

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.     

Quality of life of relatives of mental patients

Usage of quality of life of psychiatric patients' relatives as the parameter of estimation of the quality of psychiatric care is considered. By means of standard questionnaire elaborated by the authors as well as by means of both individual and group conversations the quality of life was analyzed in 40 relatives which lived together with psychiatric patients. Different spheres of their life and difficulties (financial, social-psychologic, production) were examined in families with such patients. The defects of psychiatric care that had direct influence on the quality of life of the psychiatric patients' relatives are outlined.     

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)