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在液压系统中液压冲击是机械工作过程中经常会遇到的难题,不仅会对液压系统的性能稳定性和工作可靠性造成影响,还会引起振动和噪声以及连接件松动等现象,甚至使管路破裂,液压元件和测量仪表损坏,在高压、大流量的系统中其后果更为严重。现着重对液压系统中出现的液压冲击问题进行分析,并简要提出处理解决思路。 相似文献
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液压冲击是液压系统的常见现象,对液压系统的稳定性和工作可靠性有严重的危害.该文分析了液压冲击现象的物理本质,详细阐述了产生液压冲击的原因,并提出了防治液压冲击的措施,以及如何利用液压冲击现象来增加液压管路的冲洗效果. 相似文献
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陈清 《机电产品开发与创新》2011,24(4):105-107
介绍了采用插装阀控制的液压高频直线往复泵,针对液压高频直线往复泵中存在的液压冲击问题,建立液压高频直线往复泵的液压驱动系统计算数学模型,通过Matlab/simulink仿真得出产生液压冲击的主要原因及其对液压高频直线往复泵排出性能的影响,对液压高频直线往复泵的进一步研究具有一定的参考价值. 相似文献
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影响系统液压冲击的因素很多,如管内液体速度的突变、运动部件的制动、液压元件动作不够灵敏等等.该文主要分析了系统产生液压冲击的因素与防控措施,以引起设计者和使用者的关注,从而保证液压设备的稳定性,提高系统运行的高效性. 相似文献
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在大流量、高压力的液压系统的换向过程中,会产生较强烈的液压冲击,对液压系统管路及各元件极易造成损坏,影响液压系统的性能稳定性和工作可靠性。该文介绍了一条新的实现大型油压机系统平稳换向的思路,并对此方式的原理进行了详细介绍。 相似文献
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唐开勇 《现代制造技术与装备》2006,(4):13-16
机床液压系统由于油液流动方向迅速改变或突然停止流动,产生压力冲击。压力冲击会影响液压机构工作稳定性,引起系统中的密封装置、管路、元件的损坏;压力冲击一般产生在液压缸、换向阀及系统部位;出现压力冲击,应根据情况对液压缸、换向阀等进行检修,对系统进行必要的调整,以减缓冲击。 相似文献
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液压系统由于设计与调整不当,在运行中将会产生各种故障,以下是一些典型故障的分析。 一、产生液压冲击 在图1所示二级调压回路中,液压系统循环运行,当二位二通电磁换向间4通电右位工作时,液压系统突然产生较大的液压冲击。 该二级调压回路中,当二位二通阀4断电关闭后,系统压力决定于溢流问2的调整压力P1,阀4通电切换后,系统压力则由调压阀3的调整压力P2决定。由于同4与阀3之间的油路内压力为零,阀4右位工作时,溢流阀2的远程控制口处的压力由P1几乎下降到零后才又回升到P2,系统必然产生较大的压力冲击。 不难… 相似文献
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Tian Bingqi Fan Liyun Qaisar Hayat Ma Xiuzhen Song Enzhe Hao Wang 《Journal of Mechanical Science and Technology》2014,28(4):1529-1537
Pressure variations inside a fuel injection system can lead to fluctuations in injected fuel quantity during injections and therefore can directly impact the stability and performance coherence of the fuel injection system and the engine it matched. Concepts of hydraulic capacitance and hydraulic inductance are introduced into fuel injection system by referencing LC oscillator electric circuit. A LC undamped hydraulic mathematical model is developed based on the structural parameters of the electronic unit pump (EUP). Pressure fluctuation frequency during injection process at different operating conditions of the EUP is computed by the LC undamped model. It is observed that the frequencies of pressure fluctuations tend to increase with the fuel injection process. Pressure curves and pressure fluctuation frequencies obtained by experiments at different operating conditions validated the results predicted by the LC undamped mathematical model. 相似文献
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Hydraulic thrust system is an important system in a shield tunneling machine. Pressure regulation of thrust cylinders is the most important function for thrust system during tunnel excavation. In this paper, a hydraulic thrust system is explained, and a corresponding simulation model is carried out in order to study the system characteristics. Pressure regulation of a certain group’s cylinders has little influence on regulation of the other groups’ cylinders. The influence will not affect the process much during tunnel excavation. Pump displacement may have a greater effect on pressure regulation and oil supply flow rate should be adaptive to the system’s demand. A exacting situation is simulated to explain how pressure regulation works during tunnel excavation. 相似文献
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Research Status,Critical Technologies,and Development Trends of Hydraulic Pressure Pulsation Attenuator 总被引:1,自引:0,他引:1
Hydraulic pumps are a positive displacement pump whose working principle causes inherent output flow pulsation.Flow pulsation produces pressure pulsation when encountering liquid resistance.Pressure pulsation spreads in the pipeline and causes vibration,noise,damage,and even pipeline rupture and major safety accidents.With the devel-opment of airborne hydraulic systems with high pressure,power,and flow rate,the hazards of vibration and noise caused by pressure pulsation are also amplified,severely restricting the application and development of hydraulic systems.In this review paper,the mechanism,harm,and suppression method of pressure pulsation in hydraulic sys-tems are analyzed.Then,the classification and characteristics of pulsation attenuators according to different working principles are described.Furthermore,the critical technology of simulation design,matching method with airborne piston pumps,and preliminary design method of pulsation attenuators are proposed.Finally,the development trend of pulsation attenuators is prospected.This paper provides a reference for the research and application of pressure pulsation attenuators. 相似文献
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孙乃鑫 《机械工程与自动化》2010,(2):106-107,110
介绍了一种精密水压试压装置.压力试验所用的压力釜能够自动快速开闭,密封采用自紧式密封结构.精密水压试压系统向压力釜打压时,通过稳压、缓冲、减振的作用,使升压平稳,保压精确,压力釜内的被试件不会因为压力波动太大而失稳.该装置能够完成对试压工艺曲线有严格要求的产品外压试压. 相似文献
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阐述了双作用叶片式二次元件的结构和工作原理,分析了其变量机理和节能特点,着重研究了双作用叶片式二次元件的转速转矩特性、流量特性和效率特性,探讨了该元件的应用领域。研究结果表明。叶片式二次元件具有较好的转矩和转速可控性,为减小液压系统的振动、噪声和流量脉动,应采用奇数叶片,双作用叶片式二次元件适合中高压力系统工作,可实现能量的回收与再利用。 相似文献