汽车电控发动机常见故障及其诊断方法

随着科学技术的进步,现代汽车电控系统日趋复杂,对汽车维修技术人员的要求越来越高.为使汽车不致因为电子控制系统自身的突发故障导致汽车失控或不能运行,设计人员在进行汽车电子控制系统设计的同时增加了故障自诊断功能模块,它能够在汽车运行过程中不断监测电子控制系统各组成部分的工作情况,如有异常,根据特定的算法判断出具体的故障,并以代码形式存储下来.在维修电控发动机过程中,用故障诊断仪读取电控发动机运行中的数据流,并对测量出来的数据和标准数据进行对比分析,可以快速、准确地找出故障的原因和故障的部位,大大地提高了维修的工作效率.     

电子皮带秤实际运用常见故障分析

电子皮带秤是安装在皮带输送机上,在不中断料流的情况下,对大宗固态散状物料进行连续动态称重的智能动态秤.在实际生产应用的过程中,容易受到各方面因素的影响,从而导致故障发生.通过对现场故障的分析,结合其工作原理,排除故障确保电子皮带秤正常工作.     

活塞式汽化液体泵故障分析及处理

活塞汽化泵因泵出口管压力变化引起脉冲,预冷、启动频繁,是导致设备振动剧烈、金属软管泄漏的主要原因。从基础支撑、出口管道布置、阻尼器、泵体安装、操作运行等方面分析了原因,并处理了故障。     

QSK60发动机冷却系统故障分析及检修方法

发动机冷却系统的作用是保证发动机在最为适宜的温度范围内工作。当发动机冷却系统发生故障时,发动机会过热或过冷,以致产生发动机功率下降、燃油消耗率增加和工作不平稳等不良现象,严重时产生受力零件损坏、活塞卡缸或拉缸等现象。康明斯QSK60发动机冷却系统采用双泵双循环回路结构,通过阐述其工作原理,结合工作中实践经验,对冷却系统故障的原因进行分析并提出相应的检修方法。     

加热炉汽化冷却系统热水循环泵应急启动优化

加热炉汽化冷却强制循环需要使用电动热水循环泵维持正常运行,一般采用一备一用配置。当在线运行电动热水循环泵故障没有及时发现并启动备用电动泵或应急柴油泵时,将危及汽化系统运行安全,甚至导致缺水事故。通过改造、优化系统电路和启动条件,当在线运行电动热水泵发生外部电路或本体故障时,实现了备用电动热水泵的及时启动,同时在操作台发出声光报警、操作画面弹出对话框,提示操控人员及时检查并处理故障,大大提高了加热炉汽化系统的运行安全系数。     

液压泵驱动电机跳电分析

针对武钢高炉炉前液压系统液压站主电机启动频繁跳电的故障现象,对所选用电机的启动特性和电路控制方式进行了分析,对所选用液压泵的性能和泵源液压系统也进行了分析。根据分析的结果对电路保护装置和泵源液压系统进行了改进,从而提高了泵站启动的稳定性,消除了影响高炉生产的隐患。     

DX-200中波发射机泄放电路原理与故障分析

本文对DX-200中波发射机正常关机或者故障情况下出现关机时,发射机自动启动的撬棍式残余电量泄放通路的工作原理进行了分析,并对日常维护中出现的电源放电故障进行了阐述.     

桑塔纳2000GSi轿车防盗系统故障诊断与排除

桑塔纳2000GSi和GSIAT型轿车装备了防盗器。这是一种点火开关打开后开始工作的电子防盗装置,采用使发动机不能发动的方式防盗。可以避免汽车被无权使用开走。     

承钢OA系统不能收发邮件故障分析

办公自动化系统的电子邮件不能正常收、发邮件，不仅影响到正常工作，甚至给公司和个人造成重大损失。本文先对承钢OA系统进行简单介绍，然后从邮件的工作原理出发，对引起邮件不能收发的各种故障进行了细致的分析，并针对各种故障提出了问题的处理办法，从而解决了员工办公中的实际问题。     

综采工作面采空区防灭火技术应用

由于申家庄煤矿N10909工作面回采前期采空区出现的CO超限现象,严重制约着工作面的安全、高效回采。从煤体氧化、地质构造、漏风和采空区监测等方面分析了采空区CO超限的主要原因,根据工作面回采现状,对工作面采取了注氮防灭火、安装导风装置以及安装束管监测等防灭火措施。实际应用表明,采取综合防灭火措施后,工作面后期回采过程中采空区CO浓度控制在0.002 4%以下,取得了显著的应用成效。     

热硬耐磨钢的研究及在热油泵上的应用

对热油泵的工况条件及热油泵在使用过程中出现的问题进行了分析，并在此基础上确定了热硬耐磨钢(代号ARY)化学成分的设计原则。介绍了ARY合金材料的试验方法、热处理工艺和机械性能。从动力学和金相学的角度，说明了ARY合金材料能够适应热油输送工况条件的原因。通过实验室模拟实验和设备的现场使用情况，验证了热硬耐磨钢设计思路的合理性。     

基于CAESAR Ⅱ分析浆体泵出口在环境温度下的管道布置

浆体泵在配管时不同于普通流体泵,浆体泵需要考虑管内介质对管壁的磨蚀以及管道的防堵塞,故不能像普通流体泵一样通过增加弯头数量或者增加Ⅱ型弯的方式增加管道柔性,浆体泵的配管力求管道短且直.在该条件下,本文基于CAESAR Ⅱ软件研究浆体泵在配管时通过合理的管道及支吊架布置,控制泵出口荷载在允许范围内,保证浆体泵的长期安全稳...     

油隔泵的技术改造

本文介绍了油隔离泥浆泵的工作原理，通过分析没隔离泥浆泵使用效果不佳的原因，得出油隔离泥浆泵改造的必要性。通过工业试验的结果，得出油隔泵的技术改造是可行的。     

汽轮鼓风机电动控制油泵故障分析及处理

介绍了汽轮鼓风机电动控制油泵联轴器减震垫损坏引起油泵内部故障的处理,抓好隐蔽油泵的周期管理,定期检查、更换油泵联轴器减震垫,确保了风机设备长周期稳定运行.     

New methods for the determination of hydrogen content of aluminum and its alloys: Part I. Improvements in the vacuum extraction method

The vacuum hot extraction method, first proposed by Ransley for the determination of hydrogen content of aluminum and its alloys, was systematically investigated to check if it could be considered as a reference procedure for the development of other methods directly applicable in routine work. For that, the use of an improved apparatus involving a mass spectrometer as gas detector and specimens intentionally charged with deuterium —a tracer whose properties are similar to those of hydrogen—permits the following conclusions: 1) The method is correct for any alloy, even for all the alloys with a high magnesium or zinc content, 2) The “getter effect” which could lead to inaccurate results does not occur, provided the pumping speed of the transfer pump exceeds the rate of outgassing from the sample, 3) The extraction from the solid phase seems to be complete, since results obtained in this condition are not significantly different from those obtained from melted samples. 4) The time required for an analytical determination (several hours) due essentially to the preliminary operations, cannot be practically reduced by extraction at higher temperature in the liquid state. The Ransley method can thus be considered as a reference method for checking other more practical methods.     

Disturbance of continuous, pump administration of cardiovascular drugs by hydrostatic pressure

Administration of highly concentrated, highly potent, and therefore highly dangerous drugs with syringe pumps is common in modern anaesthesia as well as in intensive care and emergency medicine. Because of their exact flow rates down to < 1 ml/h, these pumps are predestined for delivery of drugs with short half-lives, such as catecholamines and vasodilators. But intravenous application of drugs with syringe pumps is not without problems. While it is well known that syringes not fixed correctly into the pump can empty themselves by the influence of gravity, it seems not to be known that hydrostatic pressure can influence the flow rate of a correctly connected system even during continuous infusion. In this situation a change of height of the syringe pump in relation to the patient's position can have tremendous effects on hemodynamics due to unintended acceleration or deceleration of the flow rate. This case report demonstrates that the elevation of a connected epinephrine pump while moving a cardiac surgery patient after ACB operation from the operation table into his bed led to critical increases of heart rate, blood pressure and left atrial pressure. In order to quantify the problem we repeated the situation experimentally. It could be demonstrated that the elevation of the syringe pump by 80-100 cm delivers an additional bolus of 4-5 drops as the central venous catheter outlet. Lowering the pump consecutively leads to the opposite effect. In the case reported, the accidentally administered bolus of epinephrine was 12-15 micrograms (we use a concentration of 60 micrograms/ml epinephrine for continuous infusion with syringe pumps). From this accidental observation the following conclusion can be drawn: The change of height, in relation to the patient's position, of a running syringe pump during continuous infusion of highly concentrated cardiovascular drugs may cause considerable, even life-threatening hemodynamic disorders. Even in a closed infusion system (syringe-extension-central venous catheter), hydrostatic pressure influences infusion rate. Elevation of the pump leads to unintended bolus administration, and lowering of the pump is followed by an interruption of the infusion. In the knowledge of this phenomenon, unexpected hemodynamic reactions during transport of critically ill patients cannot always be interpreted as a result of inadequate anesthesia or volume load, but may be a consequence of incorrect handling of the syringe pumps as described in this report.     

75000m池空分空压机主油泵压力低原因分析与处理

针对主油泵油压低问题分析原因,不停机情况下逐一排除可能性,最终确定主油泵吸入过滤嘴堵塞是造成了主油泵压力的原因,清理后运行压力恢复。     

酒钢CSP辊缝润滑系统油量控制的研究与优化

辊缝润滑技术在酒钢CSP工厂已经应用了多年。它对降低电耗、稳定生产、改善轧辊表面质量和带钢质量等都起到了积极的作用,但是油量的波动问题一直制约着系统作用的充分发挥。通过对酒钢CSP辊缝润滑系统油量不稳定问题的研究,利用分流的原理提高了油泵的转速,有效解决了油泵电机因转速低而扭矩不足的问题,从而稳定了油量的控制,同时对头尾油量的控制进行了优化,取得了显著的效果,为同类企业使用辊缝润滑或小流量、精密、稳定控制提供借鉴。     

中板轧机滑块式万向接轴自动润滑装置研制

介绍一种用于中板轧机滑块式万向接轴的自动润滑装置。当轧机旋转时 ,固定在万向接轴平衡托瓦上的模板使固定在万向接轴上柱塞泵内的数个柱塞做往复运动 ,万向接轴旋转一周柱塞泵完成吸油和压油一个周期 ,柱塞泵压出的干油通过固定在万向接轴上的油管送至滑块与扁头或滑块与叉头摩擦表面 ,为摩擦表面提供良好的润滑条件 ,以避免滑块的发热和烧毁现象     

高原隔膜泵隔膜行程控制系统

以西藏华泰龙矿业甲玛铜多金属矿尾矿输送DGMB255／11三缸单作用隔膜泵为例,概述其主要组成部分及分类,介绍其功用、原理和特点;论述其总体构造及其在设计过程中需要综合考虑的客观因素;重点介绍高原隔膜泵隔膜行程控制系统的结构及工作原理,通过对隔膜行程控制系统的具体分析、计算,确定了高原隔膜泵隔膜行程控制系统的气源供气压力、供气流量、补油压力、单位时间内补油量等各项参数,这些参数的正确设定为高原隔膜泵隔膜行程控制系统的设计提供了一种理论依据,亦是高原隔膜泵可靠、稳定运行的必要条件。