隔膜泵大型曲轴钢锭分体制造工艺的探讨

DGMB系列隔膜泵为三缸单作用往复式活塞隔膜泵,曲轴是隔膜泵的重要部件。为满足远距离固—液两相介质长距离管道化料浆输送,曲轴的规格向着大规格、多拐数发展。传统的曲轴机械加工方法金属材料利用率低下,加工周期长等因素已经制约了隔膜泵向着现代化、大型化、高效率发展的步伐,本文通过采用钢锭分体制造工艺,将曲轴中曲拐与轴分体制造,为曲轴制造开辟了一条新路。     

100t低速重载曲轴应力动态响应计算方法的研究

本文阐述了利用有限元软件ANSYS对隔膜泵100吨低速重载曲轴进行结构应力动态响应的分析方法。分析过程中对于曲轴高应力区采用子结构技术对其应力值进行了准确的计算分析，并着重介绍了如何使用ANSYS的参数化设计语言APDL技术研究曲轴各截面应力值随曲轴转动变化关系的关键技术，为隔膜泵产品研制百吨以上低速重载曲轴及后期参数化分析及疲劳强度分析提供基础方法与数据。该计算方法为“2007年度沈阳市重点技术创新计划项目”中“低速、重载、高可靠性、大行程曲轴的结构、强度、安全裕度的系统、综合研究及应用”的部分研究内容。     

100 t低速重载曲轴应力动态响应计算方法的研究

本文阐述了利用有限元软件ANSYS对隔膜泵100吨低速重载曲轴进行结构应力动态响应的分析方法。分析过程中对于曲轴高应力区采用子结构技术对其应力值进行了准确的计算分析,并着重介绍了如何使用ANSYS的参数化设计语言APDL技术研究曲轴各截面应力值随曲轴转动变化关系的关键技术,为隔膜泵产品研制百吨以上低速重载曲轴及后期参数化分析及疲劳强度分析提供基础方法与数据。该计算方法为“2007年度沈阳市重点技术创新计划项目”中“低速、重载、高可靠性、大行程曲轴的结构、强度、安全裕度的系统、综合研究及应用”的部分研究内容。     

隔膜泵大型锻件曲轴加工工艺性分析

曲轴是隔膜泵中关键受力元件,曲轴的强度及使用寿命是隔膜泵寿命考核的关键技术指标,通过对隔膜泵使用大型锻件曲轴钢锭冶炼、浇注、锻造、粗加工、红套等诸多方面加工工艺性优化及分析,研究出用于曲轴曲拐近终形弯锻技术,预测了曲轴的加热和冷却变形,曲轴红套过盈量规律及预防曲轴红套结构变形的工艺,对未来曲轴加工工艺极具参考价值。     

卧式车床加工三拐曲轴的工装设计

卧式车床加工轴类零件时，常采用卡盘和顶尖来夹紧、定位，但是由于三拐曲轴结构的特殊性，这种装夹已不能满足生产的需要。针对这种情况，本文介绍了一种三拐曲轴在卧式车床上加工时的工艺装备的结构原理、特点、设计原理以及新工装的优点。通过实际的现场使用，能够完全满足三拐曲轴的加工要求。取得了良好的效果。     

往复式活塞隔膜泵润滑系统的设计计算方法

从分析往复式活塞隔膜泵及其润滑系统的结构和功能入手,结合实例,介绍了往复式活塞隔膜泵润滑系统中动力端十字头的摩擦功率损失、润滑系统各部分的压力损失、润滑油箱的散热面积及散热量等参数的设计计算方法,提出了动力端曲轴轴承润滑的设计参考数据。     

隔膜泵橡胶隔膜的ANSYS有限元分析

在发展重载高压大流量先进隔膜泵过程中,对隔膜泵关键部件橡胶隔膜的大变形能力和使用寿命提出了更高的要求.本文利用有限元分析软件ANSYS对隔膜泵橡胶隔膜进行建模和分析计算,为进一步优化橡胶隔膜的结构设计奠定了基础.     

通用机床加工大型单拐曲轴的工艺分析

简述了轧机设备中大型单拐曲轴的作用和结构,通过对曲轴设计精度和加工难度的分析,确定曲轴加工工艺,制造出符合设计的曲轴产品。     

基于ANSYS的隔膜泵曲轴应力强度因子有限元计算

本文基于大型有限元软件ANSYS,对隔膜泵曲轴进行三维有限元分析,确定裂纹产生的工位;运用AN—SYS软件的子模型法得到了含裂纹曲轴的应力强度因子值。为预测含裂纹曲轴的承载能力、制定判废标准等提供相关的疲劳断裂参数和技术支持。     

隔膜泵大直径橡胶隔膜变形及应力数值分析

橡胶隔膜是大型隔膜泵设备的核心零件,了解和掌握大直径隔膜在工作过程中的变形状态和应力状态,不仅能实现隔膜结构优化,提高隔膜使用寿命,也可为隔膜泵容积效率和隔膜利用率指标的综合设计提供有用数据。由于隔膜工况复杂,采用测试方法获得隔膜工作中的变形和应力状态较为困难,成本高,本文利用数值方法对隔膜泵工作过程中大直径隔膜的运动过程进行模拟,较为准确的获得了隔膜的变形和应力结果,为隔膜泵隔膜结构设计和选型提供理论数据。     

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.