刮板输送机导向装置改造与应用

通过对高炉喷煤制粉系统刮板输送机频繁出现导向轨道、刮板断裂等问题进行研究,从设备结构、制造工艺、材料选用等方面分析原因,制定了刮板机导向装置改造的方案并在现场进行了实际应用,现场改造后使用效果明显,遏制了设备故障的发生,为喷煤系统平稳运行创造了条件。     

150t转炉倾动减速机断齿原因分析及修复

针对转炉倾动机构减速机齿轮断齿事故,通过金相分析及硬度测试,发现断裂小齿轮的金相组织为马氏体和网状碳化物,且硬度偏高,小齿轮的高硬度和高脆性导致其脆性瞬间失稳断裂.为尽快恢复生产,应用保养焊接技术现场修复大、小齿轮,模具钳工手工完成齿面精度修复.修复后的齿轮已使用1 a多,效果良好.     

冷却机传动装置异常修复实例

从设备管理与维修方面,阐述了冷却机筒体受力方面产生偏移,大齿圈连接件弹簧板受力不均,弹簧板疲劳变形、断裂,导致传动系统产生异常的原因,提出了采取的维修及调整措施.     

60Si2Mn钢板弹簧失效分析

某厂生产的钢板弹簧在台架疲劳试验中发生早期断裂失效,为了找出其失效原因并制定防止断裂失效的预防措施,通过宏观观察、扫描电镜、金相检验等方法对断裂钢板弹簧进行了失效分析。结果表明:断裂发生在板簧紧固处附近,断口起源于板簧喷丸面;断口区域有明显的贝纹线特征,该断裂属于疲劳断裂;弹簧扁钢局部发生过热,出现组织晶粒粗大和全脱碳等异常组织。通过降低加热温度和减少在加热炉内高温段的停留时间,选择合适的加热速度,并控制炉内气氛等措施,可减少甚至避免热处理过程中局部过热造成的板簧早期断裂失效。     

影响圆坯振动台使用周期的原因分析

圆坯振动台使用周期不稳定,达不到周期更换的要求,影响生产.弹簧板的寿命和轴承的损坏是最主要的影响因素.通过提高轴承的工作寿命和对弹簧板改造能够有效地保证振动台的使用周期.     

PEJ1215颚式破碎机后肘板的强度分析计算

因PEJ1215简摆颚式破碎机在现场使用时多次出现后肘板断裂问题,本文通过对后肘板进行静强度和疲劳强度分析,得出比较合理的改进方案,从而预防了肘板断裂问题。     

QUl20轨道伸缩接头优化

针对我厂新装的桥式起重机大车运行QU120轨道在使用过程中频繁出现轨道伸缩接头断裂的问题,专门制定了优化措施进行整改优化,整改后取得了良好的效果.     

某型飞机发动机卡箍失效分析

某型飞机在使用过程中发动机卡箍发生断裂,厂内普查也发现此类现象.针对此情况,对失效卡箍开展了外形观察、断口宏观观察、化学成分分析、金相组织检查和晶间腐蚀倾向性验证等手段.结果发现卡箍在生产过程中存在焊接现象,焊接热影响区存在晶间腐蚀倾向性,致使卡箍在使用过程中产生沿晶裂纹最后导致断裂.     

板坯结晶器板簧振动系统非线性特性分析

应用大型有限元商业计算软件ANSYS,计算得到了板弹簧导向结晶器振动系统刚度系数在不同的变形条件下并非常数这一结论,从而引出板弹簧导向结晶器振动系统的非线性特征.通过对系统模态的分析以及瞬态分析计算,得到了系统在低阶激励频率下具有高阶频率共振响应的结果,并通过将计算得到的水平位移-垂直位移图谱与文献中测试得到的结果比较,进一步验证了模型的合理性.此外,对可能引起超谐波响应的系统阻尼非线性机制及原因进行了讨论.     

钢板磁力对中装置优化改造

针对莱钢宽厚板厂双边剪钢板磁力对中装置在生产使用中出现导向杆及导向筒断裂,开焊,以及运行中信号丢失的问题。进行分析并逐一改造和优化,改造实施后减少了故障问题的发生,确保设备稳定运行,提高了经济效益,希望为中厚板厂剪切线相关设备的应用提供借鉴。     

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)     

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.