共查询到20条相似文献,搜索用时 171 毫秒
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针对360m^2烧结机上料系统存在的问题,进行了多项设备改进,减少了烧结机的设备事故,提高了设备作业率,收到了良好效果。 相似文献
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济南钢铁集团总公司全面推行并深化设备点检测,推广应用状态监测与故障诊断技术,实现了设备的动态管理,使设备的维修方式由以时间为基础的计划检修转为以设备状态为基础的预知维修,减少了设备事故,提高了设备效率。 相似文献
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莱钢锻压厂推行全员参加的设备点检制和定修制,在生产中对设备实行定岗、定机、定员、定项、定责及一包到人,界定生产工和维修人员的点检责任,贯彻“紧固、润滑、调整、清理”的点检方针,制订考核制度,并把设备点检与定期修理相结合,从而改善了设备状况,保证了设备稳定运行,提高了设备的技术经济指标。 相似文献
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传统的变频调速恒压供水设备,往往采用带有模拟量的可编程控制器或PID调节器,PID算法编程难度大,设备成本高,调试困难。随着电力电子技术的发展,采用带有内置PID功能的变频器生产出的恒压供水设备,降低了设备成本,提高了生产效率,易于安装调试。 相似文献
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矿山设备管理中,如何改革传统的设备管理办法,实施设备点检管理,走向设备的动态管理,已被各级领导提到首要议事日程。通过推行设备点检,对设备进行简易诊断及施行一些具体的管理办法后,在黑山铁矿取得了显著的效果。 相似文献
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阐述了加强设备管理、完善设备维修体制对生产的意义,系统地介绍了设备维护、检修的几个阶段,肯定设备状态监测与故障诊断技术对预测设备故障的作用,并对攀钢公司的设备维修体制进行了分析比较。 相似文献
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介绍了应用在工业企业中作为水冷却重要设备之一的冷却塔改造过程。通过改造,提高了冷却设备的降温幅度,降低了电炉变压器的温升,保障了设备的平稳运行,减少了电炉热停,从而提高了企业效益。 相似文献
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客运专线用100米60kg/m重轨在焊轨厂拼焊后,当四面矫直时发生断裂。采用光学显微镜及扫描电镜(TEM)等方法对钢轨矫直时断裂原因进行了分析和研究。结果表明:钢轨断裂是由于距钢轨端部约100mm轨底边缘处存在凸台缺陷,此凸台在钢轨拼焊后进行除瘤时除瘤刀将其铲平,致使钢轨产生冷裂纹,进而在矫直时断裂。通过控制万能精轧上下辊的辊径差以及调整轧制线高度等方面,使钢轨出轧机时尽量保持平直,避免上翘或扣头,从而消除凸台缺陷的产生。 相似文献
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Gershon Grossman 《Canadian Metallurgical Quarterly》1991,4(1):47-66
A structural analysis is performed for the rim support of a pressurized off‐axis paraboloidal membrane, serving as a space‐based solar concentrator. The function of the rim support is to take up the tensile forces created by the stretched membrane. This paper deals with the load analysis. The tensile forces transmitted by the membrane to the rim support are calculated, and are proportional to pb, where p is the inflation pressure and b is one‐half the major axis of the elliptical rim. Next, the internal forces and moments generated in the rim support by the membrane forces are calculated. The compression forces are considerably larger, at any point, than the shear forces; both are proportional to pb2. The bending moments are proportional to pb3. The critical point is found to be at the top of the rim, where both the bending moment and compression force are at their maximum. 相似文献
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A theoretical framework for describing the role of perceptual information in early conceptual development is presented. In the main section of the article, a general operationalization of perceptual boundedness is introduced, 3 causes of this limitation are identified, the conditions under which infants and children seem to be perceptually bound are formulated, and the mechanisms by which this limitation declines are described. Traditional claims that young children are perceptually bound, as well as contemporary objections to these claims, are often based on the assumption that perceptual information is generally unveridical or insufficient. Recent doubts about this assumption are evaluated in the final section of the article. It is concluded that although realist arguments are untenable, there are limited forms of perceptual support for conceptual development. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
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宝钢含锌尘泥的循环利用工艺简介 总被引:4,自引:0,他引:4
对宝钢的含锌尘泥(转炉二次粉尘、电炉粉尘和高炉瓦斯泥)的厂内循环利用进行了研究,通过将含锌尘泥分别应用于铁水三脱、转炉造渣和电炉造泡沫渣工艺对循环利用工艺进行了试验,具体如下:将转炉二次粉尘和电炉粉尘的混合物取代烧结矿粉作为铁水脱磷剂,通过改善流动性,达到了与烧结矿粉相当的脱磷效果,在三脱处理中粉尘中的锌和铅含量得到了明显的富集,为下一步回收处理打下了基础.将转炉二次粉尘和电炉粉尘的混合物通过添加一定量生白云石和锰矿加工成冷压块,在转炉吹炼前期加入,促进了石灰的溶解,改善了前期化渣,提高了脱磷率,LT压块和矿石的耗量减少.造渣剂加入没有引起钢水的增硫明显,粉尘造渣剂的加入对钢水和炉渣成分没有影响.将高炉瓦斯泥通过添加一定量生石灰和生白云石并加工成冷压块后,在电炉熔炼期加入,强化泡沫渣操作,减少金属损失和碳粉用量.瓦斯泥压块加入后对钢水、炉渣成分和电炉的粉尘不会产生明显影响. 相似文献
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周付生 《有色冶金设计与研究》2010,31(5):15-16,19
介绍了化学品玛瑙级氢氧化铝填料生产的工艺流程以及存在的问题,并针对问题采取了一系列设计优化。实践证明,该工程工艺技术先进,采用了多项新技术、新设备及新材料,全流程采用自动控制,生产的玛瑙填料多项技术指标处于国际领先水平,取得了很好的经济效益。 相似文献
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浅析冷轧带钢在罩式炉退火中产生的粘接 总被引:3,自引:0,他引:3
经过罩式炉退火的冷轧带钢卷在开卷时有时会出现粘接这一表面缺陷。出现粘接的带钢卷层在平整开卷时将产生很高的开卷阻力 ,并在带钢表面造成带钢撕裂或折裂 ,同时伴随有开卷噪音。带钢粘接受许多操作因素的影响 ,其中有些因素又相互影响。对影响钢卷粘接的因素作了定性分析 相似文献
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Dense underflows developing two dimensionally on a slope are simulated numerically. The k–ε model is used for the turbulence closure. The boundary-layer approximation renders the governing equations in the form of parabolic partial differential equations, which are easier to solve numerically than elliptic equations. Evolution of vertical structures of dense underflows is computed along the streamwise direction. Excellent similarity collapses of the computed vertical structures are obtained. The computed profiles of velocity and concentration are compared with measured data, resulting in good agreement. The impact of a parameter representing the stratification level in the k–ε model is investigated. Appropriate values of this parameter, yielding results that are nearly identical to the integral model, are proposed. Water entrainment coefficients are estimated from computed solutions, and are observed to fall within the range of previous measurements. Finally, by using the collapsed vertical structures, profile constants defined in the integral model are calculated, which assures that the top-hat assumption necessary for deriving the integral model is valid. 相似文献
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介绍了圆弧圆锥齿轮传动的特点,针对原圆锥圆柱齿轮减速器结构设计和安装中存在的问题,进行分析和优化设计、改进材质和热处理工艺,并对减速器结构进行改造,彻底解决了圆弧齿轮折齿失效等问题,成效显著。 相似文献