共查询到20条相似文献,搜索用时 140 毫秒
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随着近两年酒钢中板品种钢和不锈钢轧制比率的提高,对翻板机的使用频率和工作强度也逐步加大,导致翻板机在2017年2月份接连出现了两次连杆断裂设备事故,一次是翻板机短拉杆断裂,另一次是翻板机翻臂撑杆断裂,并间接引发短拉杆再次断裂,为能够准确掌握翻板机拉杆、撑杆的承载能力,同时控制好现场翻板机翻板重量,避免因超载等原因造成拉... 相似文献
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济钢5号高炉大钟拉杆断裂事故发生后,制订了安全合理的抢修方案,施工质量优良,提前完成工期,通过调整复风方案,较快恢复了炉况。 相似文献
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本文通过对断裂的千吨压砖机横轴进行的高低倍分析,得出该轴的断裂是由于运行过程中与其上方的制动架拉杆摩擦,使轴的表面产生了组织变化(形成马氏体组织),而造成应力集中形成疲劳源,从而使其横轴因疲劳破坏而早期失效断裂。 相似文献
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陈刚 《金属材料与冶金工程》1997,(5):37-39
分析了湘钢3^#高炉小钟拉杆断裂和高炉炉喉膨胀节波纹管焊缝开裂设备故障产生的原因,并针对引进的二手设备具体情况及生产现场的实情采取了不同的处理方法,有效的解决了此问题。 相似文献
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高炉小钟拉杆应定制整料加工,本厂因无加工条件,在分析小钟拉杆的工况和受力后,提出采用焊接工艺,并设计焊接坡口,校核焊缝强度,提出焊接加工的技术要求,小钟拉杆加工后符合图纸要求,为中小高炉小钟拉杆的制造开创了新路。 相似文献
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为改善型钢车间轧辊滚动轴承的润滑条件 ,莱钢锻压厂设计了轧辊轴承清洗装置 ,对离线轴承进行清洗检查 ;同时改进轴承的密封结构 ,提高了轴承的使用寿命 ,降低了轴承的烧损 ,提高了轧机的工作效率 ,降低了成本 相似文献
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针对河北宣化某难选褐铁矿石,采用SEM和XRD对原矿物性结构及成分进行了分析,并运用磁化焙烧-磁选工艺进行了实验研究并对磁化焙烧-磁选工艺参数进行了优化。物相分析结果表明,该褐铁矿与脉石矿物的镶嵌关系较为复杂,SiO2含量高,运用常规的选矿方法难以分选提纯。实验结果表明,磁化焙烧-磁选工艺可以较好地完成该铁矿石的提纯。对该褐铁矿原矿在焙烧温度为950℃,焙烧时间为15min,配煤量为5%,焙烧矿粒度为150μm和磁场强度为60mT的条件下,可以得到精矿产率为43.68%,铁精矿品位为53.98%,铁回收率83.91%,wSiO2为13.9%的良好指标。 相似文献
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B Amy de la Bretèque 《Canadian Metallurgical Quarterly》1995,116(4):271-272
The adolescent's breaking of the voice is the result of the substitution of the chest voice (or heavy mechanism) for the head voice (or light mechanism). In cases of late breaking, the voice is abnormally high-pitched and feeble, often with a distorted timbre, while the larynx is normal and pubescent. Such people are generally not fully aware of their voices' real nature. Therapy classically resorts to laryngeal manipulations, of which a new technique is put forward. Another therapeutic approach is based, on the one hand, on critical listening compared with a control male voice, thus enabling the subject to become aware of his own voice, and, on the other hand, on high intensity work which helps passing from head to chest voice. 相似文献
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C Verdan 《Canadian Metallurgical Quarterly》1983,2(1):1-4
The author has created a foundation, acknowledged as being of public benefit, whose purpose is to set up a "Museum of the Hand of Man", conceived as a coordination and research center on the hand. An attempt at systematizing a prefiguration of this institution is proposed, with five subsectors: the original of this institution is proposed, with five subsectors: the original hand, the experienced hand, the hand and culture, the hand and society, and the hand as a symbol. In addition, a collection of publications on these various aspects of the hand is projected. 相似文献
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许保亮 《冶金设备管理与维修》2020,(1):37-39,45
对悬臂皮带涨紧装置进行了改型,对二尾车液压系统进行了改进,对斗轮体料斗进行了结构改进,并对悬臂皮带增加调偏装置。通过改进大大降低了堆取料机的故障率,使得高炉烧结原料保供系统的稳定性得到了提升。 相似文献
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基于计算流体力学,以相对均方根(RMS)值为气流均匀性的评判标准,应用FLUENT软件模拟了粉尘粒径、烟气流速、电晕极电压及烟气含尘浓度对静电除尘器的除尘效率和细微尘涡流现象的影响。研究表明,随着粉尘粒径和烟气流速的增大,颗粒合速度增大,RMS值大幅降低,涡流趋势减弱;而随着粒径增大,颗粒的驱进速度增大,除尘效率提高,但烟气流速增加,增大了颗粒的轴向速度,使得除尘效率降低;随着电晕极电压的升高,RMS值增大,涡流趋势增强,但电晕极电压升高,带电颗粒的电场力大幅增加,除尘效率提高。当含尘浓度小于5 g/m3时,随着含尘浓度的增加,由于“电风”的作用使得除尘效率和RMS值均增大,涡流趋势增强;但当含尘浓度超过5 g/m3时,随着含尘浓度的增加,“电风”逐步减弱,RMS值和除尘效率开始下降,涡流趋势减弱。 相似文献
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According to FDA regulations, a combination drug is not efficacious unless each component contributes to the claimed effects. For a univariate endpoint, this implies that the combination at specific doses must be superior to each of its components at the same doses. More demanding is the property of synergy, in which the effect of the combination must be superior to the effect expected based on those of its components. If it is equal to those effects, it is additive, and if it is inferior, it is antagonistic. We give regions in the combination dose plane where these concepts are well defined. If the effect of the combination is greater than the greatest effect achievable by any of its components it is therapeutically synergistic. A combination can be antagonistic, yet its components can still contribute to the claimed effects. If it is additive, synergistic or therapeutically synergistic, its components must contribute to the claimed effects. We relate these concepts and provide designs and sequential procedures for determining whether a combination is therapeutically synergistic, synergistic, additive, antagonistic and contributing or antagonistic and non-contributing. 相似文献
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大型高炉布料溜槽所处工作环境恶劣,输料时间较长,且受多种因素影响,其磨损情况非常严重。通过建立基于离散元仿真的溜槽磨损数学模型,研究某钢铁企业大型布料溜槽的磨损情况,找出布料溜槽的主要磨损部位。利用该模型分析不同的溜槽倾角、物料粒径和物理特性等影响因素,以探究溜槽磨损的规律。研究结果表明,溜槽的主要磨损是冲击磨损区,磨料磨损区较轻,并且随着溜槽倾角增加,物料粒径、硬度增大,尖角边缘过多均增加其平均磨损深度。本研究为减少溜槽磨损方面的结构改进和正确使用提供一定的参考。 相似文献