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2000年我公司从法国FCB公司引进HORO卧式辊磨,该磨的基础浇注有些特殊要求。在此将其部分要求特点介绍给大家,以供参考。1地脚螺栓的预埋形式卧式辊磨的底板和底座为一体。本体有53根地脚螺栓,其中M90×2610共36根,用于固定磨辊两端压臂支座;M60×1930螺栓4根,M42×1335螺栓13根,用于固定磨机底座。在设备安装前,应将全部地脚螺栓预埋在基础内,并要求螺栓之间的位置公差为±1mm。为此,我厂根据技术要求,用钢板及工字钢制作了预埋螺栓模板,见图1。钢板用于固定地脚螺栓,工字钢作支架,用于… 相似文献
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从2005年5月末开始,我公司水泥磨由于一仓衬板已到使用后期,经常有衬板螺栓被砸掉或砸出造成跑灰事故,需要经常换螺栓。通常的方法是将要换的螺栓转到侧面,用叉车把人举到适合的高度,用气割将螺栓割掉,残留在磨筒体里的部分用钎子将其打到磨内,然后人进到磨内,将新螺栓穿出配合外面的人紧固好。该方法费时、费力,换一颗螺栓约需停磨1h,动用设备多。 相似文献
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从2005年5月末开始,我公司水泥磨由于一仓衬板已到使用后期,经常有衬板螺栓被砸掉或砸出造成跑灰事故,需要经常换螺栓。通常的方法是将要换的螺栓转到侧面,用叉车把人举到适合的高度,用气割将螺栓割掉,残留在磨筒体里的部分用钎子将其打到磨内,然后人进到磨内,将新螺栓穿出配合外面的人紧固好。该方法费时、费力,换一颗螺栓约需停磨1h,动用设备多。 相似文献
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2004年4月我厂投用1台H RM 1700生料立磨,不久即出现2个油缸底座螺栓松动频繁、底座振动较大的现象。运行至8月份,2个油缸各有1个地脚螺栓从底座螺孔处被剪断,至2005年4月,2个油缸底座连接地脚螺栓各断掉4个,磨机给料量一到40t/h,基础抖动,油缸振动强烈,严重影响磨机安全运行。原磨机油缸底座螺栓规格M 40m m×1 200m m。螺栓断裂均发生在油缸底座螺孔下方,而且最外围一行断裂的多。我们开始认为螺栓断裂和油缸底座混凝土浇注不密实、易使螺栓松动有关。但检查发现混凝土浇注密实,底板和基础结合良好。因此,我们推测螺栓断裂是由于螺栓数… 相似文献
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中空轴法兰与筒体联接螺栓频繁断裂是水泥磨的严重故障。断裂的主要原因有押螺栓材质达不到设计要求,螺栓结构设计不当,装配质量差,螺母压紧力衰减或螺母自锁性丧失,维修方法不当等问题。冀东水泥扶风有限责任公司一台水泥磨磨头、磨尾中空轴法兰与筒体联接螺栓两次出现断裂后进行了处理,经过一段时间的运行,一切正常。 相似文献
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我公司1号水泥磨为φ2.4m×12m边缘传动闭路磨,自2004年以来,出磨中空轴和出磨端盖连接的绞孔螺栓频繁断裂,导致设备运转率低,严重影响正常的生产。
1螺栓频繁断裂原因
(1)2004年底磨体端盖环向裂开约2/3,张口约10mm左右,裂纹没有完全复位就进行了焊接,导致磨体端盖的平面度较差, 相似文献
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1983年我厂进行水泥技术改造时,将两台1.45×5.7米的生料磨、两台φ1.5×5.7米的水泥磨改造为无螺栓衬板,获得成功。四台磨机运转两年多来,情况良好,没有出现衬板垮塌事故。将无螺栓和有螺栓两种衬板的优缺点列表对比如下: 相似文献
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我公司的3号水泥磨(Φ2.4m×14m)是1957年从原东德进口的,磨头端盖与筒体为法兰联接,由36条M36mm螺栓紧固。从1998年后,发现该处的螺栓常断。刚开始每季度对法兰螺栓进行检查、更换,1年后,每星期都要停磨,对螺栓进行紧固和部分更换,并且磨体振动和偏摆严重,已无法正常生产。1故障原因拆开后发现,2个法兰接触面啃磨的高低不平(不平面度7mm左右),螺孔孔径磨大(原孔Φ38mm),并变为椭圆。原因是由于长期在交变冲击载荷作用下,法兰上的螺孔磨损和塑性变形后,螺栓只有预紧作用,没有定位紧固作用。致… 相似文献
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乙烯酮(双乙烯酮)是十分重要的化工中间体,其下游产品较多。江苏某化工厂开发生产乙烯酮(双乙烯酮)下游产品三十多个,年生产规模三万多吨,是国内以乙烯酮(双乙烯酮)为中间体生产精细化学品的综合骨干企业。针对乙烯酮(双乙烯酮)下游产品废水特点,该厂结合企业实际,开展了产品优化,结构调整,清洁生产,资源循环利用,节水降耗等工作,从源头削减了污染物的生产。同时投资二千多万元新建预处理装置三套,6000m3/d废水生化处理装置一套,使全厂乙烯酮(双乙烯酮)下游产品的废水得到了有效的治理。 相似文献
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D. G. Gordeev L. F. Gudarenko M. V. Zhernokletov V. G. Kudel’kin M. A. Mochalov 《Combustion, Explosion, and Shock Waves》2008,44(2):177-189
A semi-empirical equation of state for metals is described. Its capabilities are demonstrated by the example of the equation
of state for aluminum. New experimental data are presented on the location of the isentrope of aluminum for unloading from
the state at p = 229.71 GPa on the shock adiabat to an aerogel (SiO2) of density 0.08 g/cm3.
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Translated from Fizika Goreniya i Vzryva, Vol. 44, No. 2, pp. 61–75, March–April, 2008. 相似文献
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Jorge Marcelo Romero Soledad Bustillo Hugo Enrique Ramirez Maisuls Nelly Lidia Jorge Manuel Eduardo Gómez Vara Eduardo Alberto Castro Alicia H. Jubert 《International journal of molecular sciences》2007,8(7):688-694
A thermochemical rather simple experimental technique is applied to determine the enthalpy of formation of Diperoxide of ciclohexanone. The study is complemented with suitable theoretical calculations at the semiempirical and ab initio levels. A particular satisfactory agreement between both ways is found for the ab initio calculation at the 6–311G basis This set level. Some possible extensions of the present procedure are pointed out. 相似文献
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The objective of the study was to explore the effect of the degree of deacetylation (DD) of the chitosan used on the degradation rate and rate constant during ultrasonic degradation. Chitin was extracted from red shrimp process waste. Four different DD chitosans were prepared from chitin by alkali deacetylation. Those chitosans were degraded by ultrasonic radiation to different molecular weights. Changes of the molecular weight were determined by light scattering, and data of molecular weight changes were used to calculate the degradation rate and rate constant. The results were as follows: The molecular weight of chitosans decreased with an increasing ultrasonication time. The curves of the molecular weight versus the ultrasonication time were broken at 1‐h treatment. The degradation rate and rate constant of sonolysis decreased with an increasing ultrasonication time. This may be because the chances of being attacked by the cavitation energy increased with an increasing molecular weight species and may be because smaller molecular weight species have shorter relaxation times and, thus, can alleviate the sonication stress easier. However, the degradation rate and rate constant of sonolysis increased with an increasing DD of the chitosan used. This may be because the flexibilitier molecules of higher DD chitosans are more susceptible to the shear force of elongation flow generated by the cavitation field or due to the bond energy difference of acetamido and β‐1,4‐glucoside linkage or hydrogen bonds. Breakage of the β‐1,4‐glucoside linkage will result in lower molecular weight and an increasing reaction rate and rate constant. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 90: 3526–3531, 2003 相似文献