威金斯煤气柜调平装置故障及处理措施

威金斯煤气柜调平装置是控制煤气柜活塞水平度关键设备。调平装置中钢丝绳的异常断裂会导致活塞倾斜,问题严重时倾斜的活塞会撕裂密封橡胶膜,发生煤气泄漏。宝钢1号转炉煤气柜调平钢丝绳与柜顶梁发生干涉,钢丝绳使用寿命缩短。通过对柜顶调平导轮、滑轮的适当调整,在不改变柜顶梁结构、不影响活塞旋转度的前提下,有效地解决了调平钢丝绳与柜顶梁的干涉问题,延长了钢丝绳的使用寿命,提高了煤气柜运行的安全性。     

稀油密封干式煤气柜的安装和调试

济钢燃气厂５万ｍ＾３稀油密封干式煤气柜安装调试合格后，投入生产运行，经测定，气柜密封油润滑流动性良好，密封系统严密，活塞运行平稳，管网压力保持平衡。     

5万m~3干式煤气柜大修调试

对八钢动力厂 5万 m3干式气柜大修前的状况及存在问题进行了分析 ,介绍了对气柜活塞倾斜、防回转运行、漏油等问题的处理方法     

稀油密封干式煤气柜的制安技术

对稀油密封干式煤气柜的制作与安装，进行了技术性总结；对其侧板、立柱、活塞桁架等主要部件的加工制作和煤气柜的安装步骤，安装要领及注意事项等方面的内容作了具体介绍。     

POC新型煤气柜活塞倾斜原因分析及处理措施

某钢铁厂30万m^3POC煤气柜投运10年,活塞倾斜严重超标,倾斜度大时,双泵运行下活塞油沟油位仍有缓慢下降趋势,活塞上部一氧化碳浓度超标。针对煤气柜的运行情况,对煤气柜进行一次全面的检查,主要是与煤气柜倾斜密切联系的设备,通过大修的方式,对活塞倾斜度进行调整,恢复到标准范围内,同时油泵站的运转次数和启动时间控制在合理范围内。     

滑动式H型活塞橡胶膜密封煤气柜可行性探讨

通过对传统橡胶膜密封煤气柜分析研究,提出了独具颠覆性思维的滑动式H型活塞橡胶膜密封煤气柜构思,这种滑动式H型活塞橡胶膜密封煤气柜既具有传统一段式橡胶膜密封煤气柜全部的优点,又克服了其受力不合理、耗钢量大、无自平衡纠偏的缺点。对滑动式H型活塞橡胶膜密封煤气柜的可行性进行了探讨。     

滑动式H型活塞橡胶膜密封煤气柜可行性探讨

通过对传统橡胶膜密封煤气柜分析研究,提出了独具颠覆性思维的滑动式H型活塞橡胶膜密封煤气柜构思,这种滑动式H型活塞橡胶膜密封煤气柜既具有传统一段式橡胶膜密封煤气柜全部的优点,又克服了其受力不合理、耗钢量大、无自平衡纠偏的缺点。本文对滑动式H型活塞橡胶膜密封煤气柜的可行性进行了探讨。     

POC型10×10^4m^3干式煤气柜在韶钢的应用

韶钢1999年建成的POC型干式煤气柜是国内首次采用的圆柱形稀油密封柜,与国内常用的曼形煤气柜相比,其活塞运行更加平衡,贮存煤气压力较曼形柜高1．5－2kPa,建柜所需钢材减少20％,运行费用减少约10万元／年,但在实际运行中发展该柜存在立柱安装精度不够,侧板对接焊缝,侧板外部与立柱焊缝与活塞倾斜检测装置读数困难等问题,针对上述问题提出了一些具体的解决办法,有效地保证了干式煤气柜的正常运行,取得了显著的经济效益和社会效益。     

稀油密封焦炉煤气柜拆除方案

稀油密封焦炉煤气柜的拆除,首先要控制好含焦油、萘等杂质的煤气冷凝液对环境的污染；其次要防止高空作业过程中活塞的侧翻对人员的伤害；再次要做好作业过程中可燃物燃烧的防范措施.     

15万m^3曼型煤气柜活塞倾斜在线调整

介绍了15万m^3曼型煤气柜的在线调整，有效地解决了活塞倾斜的问题，确保了煤气柜的安全稳定运行。     

Effects of structural configuration of prosthetic aortic valves upon coronary blood flow

This study was performed in order to determine the effects of the structural configuration of prosthetic aortic valves upon coronary blood flow. A pulse-duplicating system was utilized to which a rigid model of the root of the aorta and the left artery were attached. A stented normal human valve, stented porcine valve, pivoting disc valve, tilting disc value and a caged ball valve were tested at stimulated resting conditions. The results showed that the pulse configuration and proportions of coronary flow that were systolic and diastolic changed with various valves. There was no significant reduction of the mean simulated coronary flow with the porcine valve or disc valves. Coronary flow was augmented with the caged ball valve. These differences were interpreted as being due to several fluid dynamic phenomena. These were piston effects, inertia of reversed blood flow, torque and the effects resulting from the unique pressure distribution on each valve.     

混铁车倾动力矩的仿真计算

混铁车的倾动力矩是其倾动机构设计的重要参数,以往混铁车的倾动力矩的计算多依赖于手算,计算速度慢,计算精度低。采用Solidworks软件,对300t混铁车进行了倾动力矩仿真计算,克服了上述缺点。经计算得出了倾动力矩曲线,为倾动电机的功率确定和倾动机构设计,为倾动的安全性判定提供了理论参考。     

液压钢包倾翻装置的结构分析与控制

针对恶劣工况及作业要求对液压倾翻装置的结构、动作、控制进行了全面详细的探究,对典型液压倾翻装置在实际使用过程中的优缺点进行了深入分析。设计了一种钢包倾翻装置和液压控制系统,解决了倾翻机的卡阻问题,提高了倾翻装置的稳定性、承载能力和适用范围。通过计算和设计优化,解决了系统的发热问题,采用多级保护提升了倾翻控制的安全性能,实现了倾翻装置的稳定和精确控制,降低了设备的使用故障。     

转炉倾动事故的防治与优化设计

通过对转炉倾动事故的概念、原因进行分析与研究,得到转炉倾动事故的防治方法,同时提出一种新型预防转炉倾动事故的优化设计,提高了炼钢的安全可靠性,减少了炼钢的运行成本,并用于实践,对转炉炼钢工艺及设备的设计有一定的指导作用。     

倾动炉在双闪炼铜工艺中的运用

介绍了广西金川倾动炉自投产以来的生产组织运行情况。针对倾动炉存在的设备、设施问题,以及在提高倾动炉炉寿命等方面所进行的技术提升和改进工作,取得了良好的技术效果。     

发动机活塞和缸套材料及其加工工艺研究现状

为了提高汽车发动机的燃油效率,减少尾气排放,势必对活塞和缸套在选材和加工方面提出更高要求.该文作者系统论述现代车用发动机活塞、活塞环以及缸套的材料及加工工艺的研究现状及发展趋势,并对其性能、优缺点进行分析.活塞和缸套的材料以铝合金为主,而活塞环则以铸铁为主,并且分别朝着复合材料和多元高合金铸铁的方向发展;主要通过铸造和表面处理来加工活塞、活塞环以及缸套.     

Intraluminal increase of superoxide anion following transient focal cerebral ischemia in rats

OBJECTIVES: We studied the triggering mechanism for neurally mediated syncope. BACKGROUND: Although increased transient sympathetic tone is thought to be necessary for the development of neurally mediated syncope, little is known about the triggering mechanism for neurally mediated syncope. METHODS: Plasma epinephrine (EP) and norepinephrine (NE) levels were assessed in 20 syncope patients during tilt test (80 degrees, 15 min) with and without isoproterenol (ISP, 0.01, 0.02 microg/kg/min). If syncope occurred, propranolol (0.1 mg/kg) was injected. RESULTS: Eight patients experienced syncope during tilting alone, and 9 patients required ISP for syncope. In the negative response without ISP, NE showed a small statistical 1.7-fold increase at end of tilting and EP did not change during tilting. When syncope occurred during tilting alone, a significant 11.7-fold increase in EP at syncope was registered concomitant with a small 2.5-fold increase in NE. When patients experienced syncope during tilting with ISP, a significant 5.0-fold increase in EP at syncope was registered concomitant with a small 1.7-fold increase in NE. In patients without ISP, propranolol did not interrupt syncope. In patients with ISP, six of eight receiving propranolol responded to tilting negatively. CONCLUSIONS: An increase of NE levels may result in inhibition of syncope and an EP surge may be a triggering mechanism for neurally mediated syncope. Comparatively low levels of EP may be enough to induce syncope during tilting with ISP compared with tilting alone. Propranolol is not effective in patients without ISP, but it frequently inhibits syncope in patients with ISP. Propranolol (0.1 mg/kg) may be insufficient to block the actions of high levels of circulating EP.     

150t钢水罐倾翻装置优化方案设计及实施

在实施新上150 t钢水罐倾翻装置过程中,现场调试发现该设备倾翻力矩远大于原设计电机额定驱动力矩。通过对倾翻装置设计的倾翻力矩进行了校核,分析倾翻装置的结构特点,采用了调整钢水罐在倾翻框架的定位高度,来平衡减小回转载荷力矩的方案。抬高方案实施过程中,通过精确定位和加强焊接质量控制保证了改造施工的质量。从优化后倾翻装置倾翻力矩调试结果数据来看,该优化设计方案实现了倾翻装置的稳定、安全生产要求。     

一种大型钢坯翻转装置介绍

大棒翻钢装置在开坯机组中是一个非常重要的工艺设备,针对翻钢设备存在的主要问题进行改进,介绍了改进后大棒翻钢装置的结构、工作原理、特点及主要性能参数.