多绳摩擦式提升机钢丝绳更换实践

本文主要是通过对马坑矿业副井多绳摩擦式提升机钢丝绳更换技术的应用为实例来探讨多绳摩擦式提升机钢丝绳的更换技术,目的是找到符合现场实际,同时能确保安全高效的钢丝绳更换技术,以满足现场指导施工。     

CSP连铸机扇形段位置传感器在线更换实践

讨论了CSP薄板连铸机扇形段位置传感器进行在线更换的可行性,并介绍采用位置传感器在线更换技术进行更换的方法。在涟钢CSP连铸机实际应用,结果表明：该技术可行,具有良好的可操作性,对同类型的CSP厂有借鉴作用。     

出钢口更换技术在攀钢的应用

介绍了攀钢炼钢转炉出钢口更换技术的发展历程，阐述了不同的出钢口更换技术特点并进行了比较。通过比较分析看出，使用整体式整体出钢口更换砖优点较多，较好地满足了攀钢全连铸的生产需要。     

高炉在用烧损冷却壁快速更换技术的探讨

阐述开发宝钢3BF在用烧损冷却壁快速更换技术的必要性、可行性及设备方面的难点,并对冷却壁快速更换技术的实施方法进行了初步的探索.     

一种碟型大包回转台回转轴承更换机构

本实用新型涉及一种回转轴承的更换装置,特别涉及一种碟型大包回转台回转轴承更换机构。主要解决现有更换方法存在的工作量大耗时长的技术问题。本实用新型的技术方案为：一种碟型大包回转台回转轴承更换机构,包括回转台底座和设置在底座上的回转体,回转台底座上安装有回转轴承,在回转体上通过关节轴承固定有左右回转台升降臂,其特征是：将回转台升降臂固定在中间位置,     

高炉中间段炉壳拆除更换技术

文章介绍了一种大型高炉炉壳快速拆除更换的安装技术,此更换安装技术既节约了临时支撑的材料用量,同时也节约了制作、安装费用,为今后高炉炉壳检修施工提供了宝贵经验。     

定径水口快速更换技术在方坯连铸的应用

中间包定径水口快速更换技术是提高连浇炉数 ,降低成本的有效手段。介绍了该项技术在新疆八一钢铁股份公司转炉炼钢厂连铸的应用情况 ,并阐述了快速更换机构的原理和特点 ,及其在连铸工艺上的优越性     

连铸中间包定径水口不断流快速更换技术

本文介绍地连铸中间包定径水口不断流快速更换技术的特点、优越性以及在莱钢的应用。定径水口的更换过程可在0.1秒内进行完毕,更换后上下水口的中心线误差小于0.1mm。     

安全快速更换干熄炉炉顶水封槽的方法

针对原有干熄炉炉顶水封槽更换方法存在的缺点,通过辅助更换装置的应用、水封槽底隔热材料的预先布设,更换步骤的改进、干熄炉内料位控制和预存室压力控制等技术的实施,实现了干熄炉水封槽的安全、快速更换。此方法的应用,可使更换时间缩短至6 h、恢复生产时间为4～6 h,降低了检修对干熄焦生产及高炉干焦供应的影响程度。     

新型室温磁热效应直接测量仪研制

采用冷阱技术、高精度温度传感器与高精度测量仪表、制冷/制热功率连续调节技术以及磁场系统可更换方式研制了一台新型室温磁热效应测量仪。该测量仪具有测温温域宽、测温精度高、控温平稳、磁场系统可更换等优点。测量范围-50～70℃,测量精度达到0.01℃,磁场系统为0.8～1.8 T可更换。可用于室温磁制冷材料性能基础研究工作和磁制冷工质的选用。     

ASP生产线热卷箱控制工艺优化

通过鞍钢热轧带钢厂ASP生产线热卷箱采用带芯轴技术的生产实践,介绍了带芯轴热卷箱在进一步改善头尾温度控制、提高厚度精度和扩大薄材轧制能力等方面的先进经验和工艺优化方法.     

带冷机柔性传动箱体的加工

本文通过带冷机柔性传动箱体的结构特点及使用性能的分析，并据设备能力设计了切实可行的工艺方案，先面后孔，立车与镗床相结合完成孔系加工，重点论述了分离式箱体的工艺设计和分析，对同类产品的加工具有深远的指导意义。     

热卷箱技术在柳钢热轧厂的应用

介绍了热卷箱在柳钢热轧厂的应用并阐述了热卷箱技术的特点和控制功能。     

Shear Lag Analysis in Prestressed Concrete Box Girders

Most studies on shear lag effect in box girders are only concerned about concentrated loads and uniformly distributed loads. In this paper, a finite-element method based on the variational principle is presented to analyze the effect of prestressing on shear lag in box girders. The procedures and main steps are listed to demonstrate how to use the proposed FEM, which is verified by the analytical method and the numerical examples. The shear lag effect in box girders with different types of support conditions under prestressing is analyzed in detail. The shear lag effect in box girders under prestressing is more apparent than that under uniformly distributed loads or vertical concentrated loads. The values and distributions of shear lag coefficients are relate to the anchorage locations of prestressing and the distributions of internal forces along the girder under the combined uniformly distributed load and prestressing. Among the conclusions of the study is that negative shear lag under the uniformly distributed load and prestressing may occur both at the midspan of a simply supported box girder and at the fixed end of a cantilever box girder.     

Prediction and Control of Wrinkle and Fracture for Stamping Regular Polygonal Box

Based on the deformation characteristic of regular polygonal box stamped parts and the superfluous triangle material wrinkle model, the criterion of regular polygonal box stamped parts without wrinkle was deduced and used to predict and control the wrinkle limit. According to the fracture model, the criterion of regular polygonal box stamped parts without fracture was deduced and used to predict and control the fracture limit. Combining the criterion for stamping without wrinkle with that without fracture, the stamping criterion of regular polygonal box stamped parts was obtained to predict and control the stamping limit. Taken the stainless steel 0Cr18Ni9 (SUS304) sheet and the square box stamped part as examples, the limit diagram was given to predict and control the wrinkle, fracture and stamping limits. It is suitable for the deep drawing without flange, the deep drawing and stretching combined forming with flange and the rigid punch stretching of plane blank. The limit deep-drawing coefficient and the minimum deep-drawing coefficient can be determined, and the appropriate BHF (blank holder force) and the deep-drawing force can be chosen. These provide a reference for the technology planning, the die and mold design and the equipment determination, and a new criterion evaluating sheet stamping formability, which predicts and controls the stamping process, can be applied to the deep drawing under constant or variable BHF conditions.     

无线测温技术在高炉无料钟炉顶气密箱监测中的应用

介绍了无线测温技术在高炉无料钟炉顶气密箱上的应用,验证了该系统的有效性和可靠性。在实际应用中通过监测温度的变化,制定相应措施,以减少故障的发生率,确保高炉生产的安全顺行。     

高压压球机轴承箱设计方案的改进

通过对高压压球机的轴承箱受力特点及轴承游隙变化的原因分析,对移动轴承箱的设计方案进行了修改,即在油缸与移动辊座之间增加了加固板和变点支撑板,改变了轴承箱受力状况,保证了轴承游隙,解决了移动轴承箱因变形无法转动的问题,收到了预期效果。     

热轧热卷箱电气传动系统的改造

提高热卷箱的传动稳定性和热卷箱的轧制速度对于增加轧线产能、降低生产成本具有重要的意义。简要介绍了热卷箱传动系统的构成,针对热卷箱主要设备的电气传动装置在使用中出现的问题,提出了电气传动系统改造方案,并对改造后的实际运行效果进行了分析。通过设备改造,提高了设备稳定性及轧制速度,充分发挥了热卷箱在热轧生产中的作用。     

Steel Single Box Ramp Bridges

The general advantages and disadvantages of steel single box-girder bridges, as well as their particular use in single-lane ramps, are discussed. Comparisons between steel single box girders and twin box girders are presented in regards to cost, adaptability to site restrictions, aesthetics, erection, and maintenance. It was concluded that for single-lane bridge ramps, if the economy (cost) is satisfied, a single box-girder bridge, produced by a competent steel workshop satisfying the requirements for fabrication of fracture critical members, is a viable, and often favorable, alternative.     

Shear Lag Effect in Simply Supported Prestressed Concrete Box Girder

In this paper, derivation and computed formulas are provided for the shear lag coefficient in a simply supported prestressed concrete box girder under dead load. In the case of prestressed tendons having parabolic configurations, formulas to compute the shear lag effect are also developed. The magnitude of upward loading intensity caused by prestress as well as the relationship between the height of the box girder and the sag of prestressed tendons have been fully treated. Conclusions are drawn that the shear lag effect caused by dead load and prestress force is equivalent to dead load acting alone, provided that the prestressed tendon is set up with a parabolic profile. Shear lag effect caused by movable load is also analyzed according to the eccentricity of the load to the half-width ratio of the box girder. Charts were prepared to predict the shear lag coefficient for live load. Finally, having considered the shear deformation of flanges, the deflection of box girders is studied for both uniformly distributed load and concentrated load. Examples are given for illustrative purpose.