共查询到20条相似文献,搜索用时 109 毫秒
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叙述了天铁动力厂4#空分系统辅助油泵应用EV2000变频器控制系统的过程,对运行中出现的溢油、油压波动不稳等故障现象原因进行了分析,提出了改进方案.改进后消除了故障现象,实现了闭环控制油泵的转速和启停,减小了对电机和电网的冲击和振动,提高了设备的可靠性,延长了电机使用寿命,保障了生产的顺利进行. 相似文献
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分析了20 t桥式抓斗起重吊车常见故障及原因,采取了相应的解决措施,从根本上杜绝了吊车的常见故障、节约了备件、降低了生产成本、减轻了维修人员劳动强度及提高了企业的经济效益. 相似文献
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济钢中厚板厂3500线粗轧机改造主传动系统采用ACS6000SD变频驱动系统,系统的整流侧和逆变侧采用了对称结构,降低了维护难度;采用了IGCT技术,保证了系统的性能响应;使用了DTC技术,提高了系统的鲁棒性。这种交直交系统做到了对电网的最少谐波运行,既减少了对电网的污染,又省去了无功补偿系统的投资。 相似文献
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介绍了Access数据库的特点和优点,在采购管理中应用的意义.使用Access编写了<供应仓储管理系统>,论述了该系统的设计思想、程序结构及应用效果.该系统的应用,减轻了工作人员劳动强度、提高了工作效率、确保了物资及时供应、减少了资金的占压. 相似文献
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用友资产管理系统根据天铁集团的设备管理要求配置了相关的功能模块,实现了设备管理的精细化、科学化、信息化,提高了设备的管理水平,降低了设备维修费用,同时实现了与财务一体化的无缝对接,为相关的钢铁企业设备管理信息化工作提供了参考。 相似文献
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5052 H32板材生产工艺研究 总被引:2,自引:0,他引:2
对5052 H32板材的生产工艺进行了试验研究。通过近一年多的技术攻关,优化了熔铸工艺参数,解决了热轧坯料的粘铝和板形问题,优化了冷轧工艺方案和退火制度.从而提高了5052 H32板材的机械性能、深冲折弯性能及表面质量,满足了用户要求。 相似文献
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通过对钛及钛合金标准中规定残余伸长应力表述的分析和探讨,从标准几次修订描述过程来探讨目前国家标准和国家军用标准中对规定残余伸长应力测试存在的问题,并对今后标准再次修订中的修改提出建议。 相似文献
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LR Kaiser 《Canadian Metallurgical Quarterly》1997,9(4):383-390
It can be safely stated that currently there exists no standard therapy for malignant mesothelioma. The "standard" methods of chemotherapy, radiation therapy, and surgery have all been used with little improvement in overall survival. Trimodality therapy that involves a combination of all three standard treatment modalities has been shown to improve survival in selected patients. New and innovative treatment strategies clearly are needed for a disease which, because of the disappointment with standard therapy, is most commonly approached with only palliative intent. The location of this malignancy and its tendency to remain localized make it an ideal target for intracavitary approaches using photodynamic therapy, targeted cytokines, and gene therapy. Strategies using modulation of the immune system in an attempt to elicit a specific response to the tumor have been combined with chemotherapy to optimize response. Lessons learned from treating this localized malignancy with novel therapies may have much broader implications for other tumors in which systemic disease predominates. 相似文献
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Rareearthionsposessomespecialfunctionsinbiologicalbody.Aminoacidsarethestructureunitofproteins.Imidazoleisheteroclycliccomp... 相似文献
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A. V. Sukhov A. S. Razumov Yu. A. Bazanov S. L. Shitkin A. S. Grinshpon A. A. Yandimirov 《Metallurgist》2007,51(11-12):670-676
Results obtained from extensometric and x-ray diffraction studies have shown that standard railcar wheels with a plane-conical web have a high concentration of stresses in the rim region under normal service loads. Fatigue cracks were found to be formed and grow within this region. Wheels with a curvilinear web have advantages over the standard wheels in terms of their stress state. On the average, the total stresses in them are 1.5 times smaller than in standard wheels. As a result, S-shaped wheels have greater fatigue strength and can withstand tests at loads above 100 ton-f without forming cracks. Based on the findings from laboratory and field tests, the new wheels have been certified and recommended for use on new-generation railcars with axial loads of 25 ton-f. 相似文献