矿用电动轮汽车日常维修成本规律研究与分析

日常维修成本是电动轮汽车维修成本的重要组成部分,通过对日常维修成本建模研究,深入分析原因及规律,及时掌握电动轮汽车的运行状况,为科学评估电动轮汽车大修,降低成本,提高运行效率提供了重要依据,并提出了减少日常维修成本的主要途径。     

矿用电动轮自卸卡车空调系统典型故障探究及处理

介绍了矿用电动轮自卸卡车空调系统的主要结构组成和工作原理,分析了系统典型故障,提出了相应的解决方法。     

矿用自卸卡车模块化设计思考

矿用电动轮自卸卡车具有装载量大、运行效率高、经济性好特点,成为大型露天铜矿、煤矿、铁矿的运输工程卡车。目前,国内有多家重型装备企业在生产电动轮自卸卡车但卡车的控制系统及主要总成件掌握在美国通用电气、德国西门子、美国卡特彼勒等公司手中,电动轮卡车制造利润大部分流出,同时卡车维护备件、总成件价格受到极大制约,并且卡车核心技术无法自有使国内大型自卸卡车的发展严重受制。从小松730E电动轮汽车在运行维护中存在问题为基础,提出了动力传动系统及辅助控制系统的模块化设计思路,应用现代电机控制系统实现卡车的动力控制,为电动轮重装卡车国产化提供一个可能的途径。     

MCC400A自卸卡车举升故障分析及处理

由中冶京诚湘潭分公司生产的MCC400A自卸卡车,从2013年7月份开始陆续组装,在江西德兴铜矿采矿场首次投入使用。针对自卸卡车举升系统常见故障进行深入的分析探究及处理,确保安全生产,提高作业效率,降低生产成本,延长其使用寿命,为提高矿山的运营效率和经济效益提供了技术保障。     

露天矿用电动轮卡车转向油路系统故障探究及处理

介绍了矿用电动轮卡车转向油路系统的组成、技术参数及工作原理。结合矿山实际,详细介绍了系统的各种故障及处理措施,对确保安全生产、提高作业效率,提供了强有力的技术保障。     

液力传动矿用车辆的发展及组合式液力机械变速箱的探讨

随着采矿工程建设事业和液力传动技术的迅速发展,液力机械传动矿用车辆的应用越来越广,发展越来越快。 比同级电动轮自卸汽车有更高效率、更低成本的1240马力、110吨级液力传动自卸汽车的使用,710马力推土机、1000马力装载机和400马力井下铲运机等车辆的出现,反映了世界上液力传动矿用车辆向高效、大型发展的趋势,引起了有关方面极大的注意。 液力传动,是以高速液流为介质传递动力的传动装置,通常采用液力变矩器作为传递装     

630EⅢ电动轮前悬架主要故障与简易维修

分析了630Ⅲ电动轮汽车前悬架故障原因，并针对主要故障提出经总结得到的维修方案。该方案可节约630EⅢ电动轮汽车维修成本，提高设备利用率。     

大型矿用自卸卡车主梁焊接修复工艺的应用

一般在大型矿山中的开采活动中总是少不了大型矿用自卸卡车的身影。自卸卡车肩负着开采当中的主要任务,随着不断发展的工业与作业的提升,大型自卸卡车在常年的超负荷当中持续运作,继而导致卡车的箱斗以及主梁的结构产生裂损。如果在修复裂损问题上不采取合理的方案,不但会对施工带来安全隐患问题,还会对施工效率造成一定的滞后问题。所以,本文重点阐述的是矿用自卸卡车中主梁的焊接修复工艺的应用[1]。     

大型矿山电动轮汽车转向缸销结构设计改进

从研究730E大型矿用电动轮汽车转向缸销结构入手,分析了转向缸销存在的主要问题,并提出了相应的结构设计改进方案,可大幅提高电动轮汽车作业效率、可开动率和设备利用率,降低生产成本,延长使用寿命,为保障矿山安全生产提供了强有力的技术保障。     

KSY191—(Ⅰ)型电动轮励磁系统的研制

一、概况在大型露天矿山,采用大吨位矿用电动轮汽车取代传统机械传动汽车,无论在管理上、经济效益以及维修上所具有的优越性,业已为国内外的实践所证实。国外大型露天矿山60％以上采用矿用电动轮汽车运输,其中又以170短吨级车居多。我国本钢南芬露天铁矿多年使用电动轮汽车和江西德兴铜矿自1984年7月使用电动轮汽车运输以来的实践表明,矿用电动轮汽车确实是一种先进的高效运输设备。 KSY191-(Ⅰ)型电动轮励磁系统研制项目是中国有色金属工业总公司新产品开     

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.