引进四辊轧机辊系的改造

对引进的四辊精轧机进行改造,采取了增大工作辊、支承辊辊径,将落后的工作辊滑动轴承改造为滚动轴承,改进密封、润滑方式等方法,并对改造后的辊系进行了结构尺寸分析和强度分析。使用证明,轧机作业率提高,换辊时间缩短,轴承寿命延长,轴承精度提高,满足了单机架轧制的要求。     

2500mm四辊轧机升级成2690mm四辊轧机

介绍了2500 mm四辊轧机改造升级为2690 mm四辊轧机的方法,重点论述了万向联轴器、联轴器平衡装置、工作辊装配、平衡系统装置、压下装置及推床的改造内容。     

四辊轧机机后阶梯辊道电机控制柜改造

通过对四辊轧机机后阶梯辊道电机控制柜新老系统的性能、成本、操作、安全性等方面进行了比较，并在比较分析的基础上先后二次进行了技术试验与改造，取得了显著的效果。     

济钢3200mm四辊粗轧机机架辊受力分析

济南钢铁集团总公司宽厚板厂3200mm四辊粗轧机,系由荷兰引进的二手轧机改造而成,原为精轧机,在我公司改造为粗轧机后,将原来适应精轧机的机架辊改造为适应粗轧机的机架辊.由于设计过程中,对机架辊的受力状态缺乏全面的分析,机架辊一端固定在垂直预埋板上,基础受力状况为垂直方向36.8t,另一端利用轧机地脚螺栓固定,致使在投用几个月后,就出现了预埋板脱落现象,被迫停产加固.为使加固后的机架辊适应粗轧机负荷变化大的要求,我们对粗轧机轧制过程的受力状况进行了认真的分析,以指导机架辊新的加固方案的实施.     

WRS轧机与普通四辊轧机的改造

ＷＲＳ轧机通过工作辊的轴向移动，配合液压弯辊技术，提高了板形控制，改善了边部减薄。对工作轴系的结构及轴向移动机构重新设计，可将普通四辊轧机改造为ＷＲＳ轧机。     

万能轧机组自动换辊改造

马钢万能型轧钢厂万能轧机生产线，原来的自动换辊系统存在着速度和安全方面的不足。文章介绍了根据现有设备的实际情况对这套系统从工艺、机械和电气各个方面进行一些改造的方法。     

济钢中板厂四辊轧机换辊机改造

济钢中板厂对四辊轧机换辊机整体式滑座改为三段铰链式滑座,并对插座等其它相关件一同考虑进行改造,消除了原轧机弹跳和滑座断裂现象,大大减少了故障时间,降低了备件费用,提高了轧机稳定性,满足了生产产量和质量的要求。     

液压厚控系统在热轧二辊轧机上的应用

我所热带生产线上的Φ660ｍｍ×762ｍｍ二辊单机架可逆轧机,是1995年从美国Ｓｐａｎｇ公司购买的二手设备。它设有Ｚ80计算机液压厚控系统,设计轧制力为454ｔ,在预先确定的道次程序下,该系统能自动连续地设定辊缝值,也可手动一个道次一个道次地进行轧制,具有一定的先进性和实用性。1　压下系统主要元件及工作原理11　压下系统主要元件轧机压下控制系统原理图如图1所示。在轧辊的操作侧和驱动侧上方各有一液压缸。在每一液压缸的正上方各有一与其刚性连接的用来测量辊缝的线性编码器或称作位置传感器,液压缸活塞的移动由三位四通Ｍｏｏｇ伺服…     

早期松德维哥20辊轧机电气系统数字化改造

介绍了使用计算机、 PLC、直流调速器、测厚仪等数字化先进设备对20世纪60年代松德维哥20辊轧机模拟电气控制系统及F-D机组进行数字化改造的方法,着重阐述了厚度控制系统、张力控制系统、传动系统、基础自动化部分改造的方法.改造后的设备已在陕西宝钛集团投入使用,实践证明改造后的电控系统运行是安全可靠和稳定的.     

四辊轧机联轴器技术改造

介绍了四辊轧机联轴器改造为无螺栓式方案的可行性和效果分析。     

Biosensor for Detecting Odorous Compounds

The odor quantification of any environmental sample by use of either panel decisions or analytical instruments is difficult. This study employed a sensor system to detect different odorants. The system consisted of an individual sensor or an array of multisensors in which different synthesized protein analogs were coated onto the surface of piezoelectric electrodes. By monitoring the change in the resonant frequency, the concentration of the specific gas was quantified. The targeted odor pollutants included volatile compounds of ammonia, mercaptoethanol, methyl amine, acetic acid, and chlorobenzene as well as gaseous compounds of ammonia and methyl amine. The results indicate that there is a linear relationship between sensor responses and compound concentrations. These sensors can detect compound concentrations in the low ppmv ranges. The response time is rapid. However, the system is not completely reversible—i.e., sensor response did not revert to its original value because of incomplete desorption with odorless air. Nevertheless, the response of the module forms a unique fingerprint for each individual compound and for mixed compounds. But reliability, stability, durability, and implementation of the system await further investigation.     

水处理干石灰投加自动化控制系统改造

介绍了对原水处理干石灰投加系统的改造,把原来由单片机控制器改成了由西门子300PLC控制并带远程控制的自动化系统,减少了故障点,消除了原先设备存在的隐患,提高了系统的稳定性。     

制冷机电气仪表控制系统改造

溴化锂制冷机是焦化厂用于冷却荒煤气的重要制冷设备.主要介绍了溴化锂制冷机的工作原理及应用,根据工艺要求,在旧系统的基础上完成了电气仪表控制系统的改造,实现了全自动开停机,节约了资金,达到了工艺要求的制冷效果.     

锻造电阻加热炉控制系统的改进

本介绍电阻加热炉采用双向可控硅控制加智能仪表，周波控制器的控制系统代替原来的接触控制系统后，在实际中获得满意的控制和节能效果。     

Systematic distortions in magnetic position digitizers

Medical devices equipped with position sensors enable applications like image guided surgical interventions, reconstruction of three-dimensional 3D ultrasound (US) images, and virtual or augmented reality systems. The acquisition of three-dimensional position data in real time is one of the key technologies in this field. The systematic distortions induced by various metals, surgical tools, and US scan probes in different commercial electromagnetic tracking systems were assessed in the presented work. A precise nonmetallic six degree-of-freedom measurement rack was built that allowed a quantitative comparison of different electromagnetic trackers. Also, their performance in the presence of large metallic structures was quantified in a phantom study on an acrylic skull model in an operating room (OR). The trackers used were alternating current (ac) and direct current (dc) based systems. The ac trackers were, on average, distorted by 0.7 mm and 0.5 degree by metallic objects positioned at a distance greater than 120 mm between the geometrical center of the sample and the sensor. In the OR environment, the ac system exhibits mean errors of 3.2 +/- 2.4 mm and 2.9 degrees +/- 1.9 degrees. The dc trackers are more sensitive to distortions caused by ferromagnetic materials (averaged value: 1.6 mm and 0.5 degree beyond a distance of 120 mm). The dc tracker shows no distortions from other conductive materials but was less accurate in the OR environment (typical error: 6.4 +/- 2.5 mm and 4.9 degrees +/- 2.0 degrees). At distances smaller than approximately 100 mm between sample and sensor error increases quickly. It is also apparent from our measurements that the influence of US scan probes is governed by their shielding material. The results show that surgical instruments not containing conductive material are to be preferred when using an ac tracker. Nonferromagnetic instruments should be used with dc trackers. Static distortions caused by the OR environment have to be compensated by precise calibration methods.     

圆盘真空过滤机的改进与应用

原有圆盘真空过滤机在许多岗位上的使用存在很多问题,严重制约了圆盘真空过滤机的发展。现从滤扇结构、主轴传动装置、卸料方式的改进和新型过滤布选用入手,对原有的圆盘真空过滤系统进行了改造,并在现场取得了成功应用。与改造前相比,过滤效率提高了25%～30%,滤饼水分也有所下降。     

火电机组热工控制系统改造与人机界面安全

国内首批成套引进的火力发电机组及控制系统服役已超过25年,当时主流的以组装组件式仪表为核心辅以计算机监视及少量计算机DDC、SPC控制,并以BTG模拟盘为人机监控界面的系统,由于存在各种问题,重新规划改造成当前主流的分散控制系统(DCS)是大势所趋。从宝山钢铁股份有限公司电厂的生产实践中,探索新老系统特征及安全可靠性,以使该控制系统顺利运行。     

彩涂板生产线卷取机稀油润滑系统改造

稳定高效的润滑是确保机械设备正常运行的关键，彩涂线卷取机原设计的稀油润滑系统不能满足使用要求，在对系统进行了重新设计和改造后，润滑能力、自动化程度两方面取得了令人满意的效果。     

连铸方坯火焰切割机适应性改造

冷钢STEL-TEK型2#3#连铸坯切割机采用的是火焰切割机。原切割机零部件易坏,难于维修、操作,不能有效地应对铸坯跑偏以及在生产中难于更换切割枪等。为此采取了一些措施,对切割机进行了适应性改造。结果表明,改造后的系统运行稳定,故障率低。     

焦化废水处理系统的改造

介绍了莱钢焦化厂废水处理系统采用MBR膜工艺和臭氧工艺对原系统改造的原理、方法及实施过程。