无水冷滑轨加热炉的应用

本文介绍了无水冷滑轨加热炉的滑轨构造，阐述了其热负荷分配原则、与水冷滑轨加热炉操作的不同点和注意事项，用数据说明了无水冷滑轨加热炉可取得优质、高产、低能耗的综合效益。     

150方坯无水冷滑轨加热炉改造的实践与总结

简要介绍了无水冷滑轨加热炉结构以及使用效果，表明了无水冷滑轨加热炉加热大方坯是可靠的，并且节能效果明显。     

Co40、Co20耐热滑轨在连续加热炉上的应用

轧钢加热炉普遍存在着钢坯加热黑印的缺陷.介绍了湘钢第二棒材厂轧钢加热炉在技术改造过程中,通过采用Co40、Co20全热滑轨取代传统的滑轨材质,达到了延长加热炉使用寿命和改善钢坯加热质量的目的.     

新型全热滑轨在轧钢加热炉上的开发应用

推钢式加热炉普遍存在着钢坯加热黑印严重的现象,而全热滑轨在轧钢方坯加热炉上使用易造成推钢故障,影响安全生产。介绍一种新型全热滑轨的设计与成功应用,能避免滑轨故障,提高钢坯加热质量和轧制节奏,具有较高的应用推广价值。     

板坯加热炉的新型滑轨

1.前言 轧钢连续式加热炉改造成架空的炉型结构 之后,均热段一般采用高铬铸钢半热滑轨,也 有不少加热炉均热段仍是水冷滑轨。首先,由     

采用新技术降低加热炉管底比

在小型加热炉上采用无水冷滑轨和金属滑轨,在大中型加热炉的预热段采用窄墙和座砖,在大中型加热炉的加热段采用盲肠管式T型支撑,从而大幅度地降低了加热炉管底比,取得了显著的节能效果。本文还论述了盲肠管式T型支撑在加热炉汽化冷却自然循环中的作用、运行原理、冷却效果及其效益。     

热滑轨的试验及其生产

1981年以来,对推钢式加热炉的热滑轨进行了试验。安装在半连轧厂4号加热炉上的热滑轨,至今已用了十三个多月,其磨损只有3～4毫米,预计还可用5～6个月。与旧式的滑轨比较,有较好的高温性能,且单位坯料加热能耗有所降低,     

天然气无水冷滑轨加热炉——对成钢小型加热炉改造的技术分析

一、前言冶金工业部于1974年8月在天津召开了“加热炉无水冷滑轨技术鉴定会”,肯定了无水冷滑轨加热炉是我国轧钢加热技术的一项重要革新。近年来无水冷滑轨加热炉已经在北京、上海、天津、江西、湖北等省市推广使用,并获得了成功。根据1980年3月成都市金属学会第二届会议精神,要求我厂在本省首先推广试用这一新技术。我厂于1980年7月在小型加热炉中,低温段首先试用。同年11月后又对该炉进行了两次较大的改     

连续板坯加热炉新型滑轨的研究

1. 前言轧钢连续式加热炉采用架空型炉底结构之后,均热段的滑轨成了关键.均热段一般采用高铬铸钢的半热滑轨,也有用水冷滑轨的.首先,由于水管无法绝热包扎,造成大量热损失;其次,消耗大量价格昂贵的金属材料;第三,板坯有黑印.故寻找一种适合板坯加热用的滑轨结构是十分必要的.1965年在板坯加热炉上曾试用过一种特殊结构     

加热炉滑轨的炉外预制

介绍了炉外预制加热炉滑轨的过程，并分析了机理以及该方法在营口中板厂加热炉的应用实践。     

60t／h推钢加热炉结构的技术改进

介绍了在推钢式加热炉中,合理布置水冷滑轨和滑块,能有效防止钢坯黑印的产生,正确确定炉膛尺寸和自动控制系统是提高生产效率的保证。     

静态轨道衡在电解铝厂贸易计量管理中的应用

通过对四川启明星铝业动态轨道衡进行大宗物料贸易计量效果不佳情况的分析,论述了安装静态轨道衡解决贸易计量要求的必要性。重点介绍了静态轨道衡选型、选址方案、静态轨道衡贸易计量管理体系特点,并对目前静态轨道衡不足之处提出了优化建议。     

50 kg/m钢轨踏面掉块缺陷分析

 50 kg/m钢轨在使用一段时间后踏面出现掉块缺陷。采用光学显微镜、图像仪和低倍检验等方法对钢轨踏面掉块缺陷产生的机理进行了分析和研究。结果表明,掉块缺陷的形成是由于钢轨滚动接触疲劳伤损所致。改善轮轨接触方式,减少钢轨踏面的轮轨接触应力,可以减缓曲线钢轨踏面压溃、剥离裂纹和浅层状剥离掉块伤损的出现,通过对钢轨进行及时的预防性打磨,是预防和减轻滚动接触疲劳伤损的最有效方法。     

Experimental Investigation on Effectiveness of a Vertical Drain under Cyclic Loads

This study examines the effectiveness of a prefabricated vertical drain (PVD) installed in reconstituted soft clay, where a large cyclic triaxial device was used to simulate repeated loading representing a rail track environment. The experimental data demonstrate that PVD successfully prevents excessive buildup of pore water pressure during cyclic loading, and that dissipation continues to occur after the load is removed. The findings of this study have direct relevance to rail track environments, e.g., in coastal Australia, where PVD installation beneath rail tracks constructed on low-lying estuarine soils has been recently introduced.     

Effects of Train Characteristics on the Rate of Deterioration of Track Roughness

Track roughness describes in part the up and down waves in the longitudinal geometry of a railway track. A train passing over rough track experiences a degree of bouncing that generates oscillations in the forces exerted by the train’s wheels on the top of the rail, which in turn cause this roughness to worsen. The rate at which the track roughness deteriorates depends on the response of the track to the weight of the train and to the dynamic oscillations in wheel/rail forces, which in turn are affected by the properties of the train vehicles’ components and the speed of the train. The paper develops relationships between the severity of track roughness and the dynamic wheel/rail forces generated by a moving train using field data, and between those forces and the specific vehicle characteristics of speed, total mass, unsprung mass, suspension stiffness, and damping, using NUCARS simulations. These two relationships in turn are combined to show how the speed of the train and the design of the train vehicle’s bogie suspension can worsen or improve the rate of deterioration of track roughness. The relationships also provide a firm basis for the owner of track to set more representative charges levied on the train operator for using the track.     

冶金企业铁路曲线护轮轨轮缘槽宽度的计算与探讨

针对冶金企业铁路多为小半径曲线需安设护轮轨的现状,对护轮轨轮缘槽的有效设置宽度进行了计算与探讨。     

U75V重轨钢280mm×380mm连铸坯加热工艺的试验研究

在钢厂利用Thermophil STOR测试系统(黑匣子)进行步进式加热炉内U75V重轨钢280 mm×380mm铸坯加热过程温度跟踪,并用Origin软件进行数据处理,得出铸坯加热温度、升温速度、表面与中心温差等曲线.结果表明,铸坯平均加热温度为1 220℃,当在炉时间超过180 min,应降低均热段控制温度约20℃...     

冶金企业重载铁路道岔防磨护轨技术的应用

介绍了承钢铁路道岔的特点。针对其重载铁路道岔尖轨使用寿命短、稳定性差等问题,采用了在道岔尖端曲基本轨侧安装防磨护轨的技术方案。实施后,尖轨磨耗明显减少,更换尖轨数量仅为2013年同期的1／4,更换周期由15天延长到30天。同时改善了列车过道岔的平稳性,为承钢安全生产提供了有力保障。     

处理桥式起重机挠度及啃轨的新方法

桥式起重机在长期使用中,主梁会产生下挠,还会出现啃轨现象。通过分析和理论计算,拉钢丝绳法和圆弧轮轨法对处理桥式起重机挠度和啃轨具有很好的效果和实用价值。     

Effects of Principal Stress Rotation on Permanent Deformation in Rail Track Foundations

A realistic assessment of the whole life cost of rail track foundations requires analysis of the effects of the repeated loadings applied by trains. This paper reports the effects of principal stress rotation (PSR) during cyclic loading on the permanent deformations measured in a series of hollow cylinder tests. The tests were carried out on a number of reconstituted soils selected in order to simulate foundation materials on an existing heavy haul railway line. Typical loadings and track geometry together with dynamic finite-element analyses were used to define representative stress changes to be applied to these soils, which were then tested with and without principal stress rotation during loading. It is shown that principal stress rotation has a significant and deleterious impact on permanent deformation of some materials. Therefore, it is concluded that cyclic triaxial testing, which cannot impose principal stress rotation, will not necessarily give good estimates of the long-term performance of rail track foundations. As PSR cannot be ignored when evaluating permanent displacements of rail track foundations, the use of more appropriate (realistic) testing methods such as the cyclic hollow cylinder or the cyclic simple shear apparatus is required.