共查询到19条相似文献,搜索用时 109 毫秒
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我厂生产的HZC512JSQ型液压随车起重机和HZC3090型自卸汽车的液压元件品种较多。根据国家有关标准规定:对每个液压元件均应进行出厂试验,为此我们研制了多功能液压元件性能试验台。经过几年的生产实践表明,该试验台完全适用于液压多路换向阀、双向液压锁、平衡阀、手动换向阀、液压缸等各 相似文献
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液压系统工作性能的优劣与液压元件性能和质量及液压系统的结构有关。用双级换向阀组合的逻辑回路,所用元件的品种和数量以及外接管路数少,系统的结构简单紧凑,且能逻辑组合出多种滑阀机能。 相似文献
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一、问题的提出目前液压系统中的换向阀不论是滑阀、锥阀,它们都没有彻底跳出滑阀的范畴。众所周知,滑阀不论在对液压油、过滤精度、加工精度、材料及热处理等方面要求较高外,而且还存在着内部泄漏、互换性差、不易修复等缺点,能否开辟新的途径去解决滑阀存在的问题,这就向设计者提出了新的课题。本文就63巴液压膜片式逻辑元件和换向阀的研究成果作一介绍。二、液压膜片式换向阀的工作原理和结构液压膜片式换向阀由液压三门、四门、电磁卸荷阀组合而成双电控二位四通。其回路见图1。液压四门是双稳元件,S_1和S_2是它的两 相似文献
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轮胎式装载机工作装置液压系统主要由油箱1、滤油器2、工作泵3、安全阀4、铲斗换向阀5、溢流补油阀6、动臂换向阀7、动臂缸8,铲斗缸9、散热器10以及操纵系统和管路附件等元件组成,如图1所示。这些元件配合间隙很小,且有节流孔,若液压油污染度较高或液压元件精密度较低,容易造成液压元件及整个液压系统故障。本文以XG953H型轮胎式装载机为例,分析其液压系统常见故障产生的原因,并提出排查方法。 相似文献
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吴利文 《机械工人(冷加工)》1986,(10)
随着电器化、工业自动化程度的飞跃发展,液压传动已成为一种不可缺少的工作系统。电磁换向阀是液压系统中的主要元件。它能直接控制各种液压系统中各执行元件的动作,如液压缸的往返、液压马达的回转等。电磁换向阀的加工制造精度要求很高,在使用中必须有一个严格的工作场所。一般来说,要有以下几个要求:1.使用油液为液压油、20或30机 相似文献
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遥控操作煤机装备负载敏感液压系统采用负载敏感电比例多路阀控制执行元件存在过度设计问题。通过分析煤矿用负载敏感液压系统的特点及压流特性,进而确定负载敏感用防爆电磁换向阀组的设计要求,设计了三联防爆电磁换向阀组元件原理图和整个负载敏感系统原理图;然后对阀组进行三维建模设计、元件选型;最后对制造的三联电磁换向阀组的应用情况进行了介绍。结果表明,该阀组的设计研究为矿用负载敏感系统控制提供了新的解决方案。 相似文献
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负载口独立技术是液压技术的新方向,它用两个换向阀分别控制执行元件的进、出油口来控制执行元件的运动方向以及运动速度,该方法较传统的换向阀系统提高了液压系统的控制自由度。利用增加的控制自由度,尽可能多地提高液压系统的节能性,其控制性能是负载口独立技术研究的重点之一。 相似文献
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关于液压元件综合试验台的系统综合结构设计 总被引:1,自引:1,他引:0
该文介绍了液压元件综合试验台的内部系统综合结构,指出了设计一台液压元件综合试验台要注意的核心部位,提出了以板式多油口阀电液换向阀试验台作为主控主体试验台。因为它具备了P、A、B、T四个油口的条件,用它来作为液压元件综合试验台的主基板最为合理,它即是被试件,同时也是综合试验台的功能阀。 相似文献
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GONG Yongjun YANG Huayong WANG Zuwen 《机械工程学报(英文版)》2009,22(1):109-115
Due to the fire resistance and environmental compatibility, using water as the working fluid in hydraulic circuits is receiving an increasing attention by both manufactures and users. This hydraulic directional valve is developed. When new water hydraulic directional valve is designed and manufactured, this paper introduces a water hydraulic 2/2 directional valve and its principle. The valve is composed of a hydraulically operated seat valve and a magnetic 3/2 direction valve. Aimed at the serious leakage and impact generating easily in reversing suddenly, an improved structure of water space seal is changed to direct seal, compaction force between main valve spool and main valve pocket was logically designed and damper in pilot valve port is matched with sensitive cavity in main valve. From the view of flow control, the methods of cavitation resistance of the directional water hydraulic valve are investigated. The computational fluid dynamics approaches are applied to obtain static pressure distributions and cavitation images in the channel of the main stage of the valve with two kinds of structure. The results show that the method of optimized spout can effectively restrain cavitation. The work provides some useful reference for developing water hydraulic control valve with the Dower noise and lower vibration. Meantime, the structural parameters are optimized on the basis of information obtained from simulation. Static test, dynamic test and life test are accomplished, and the results show that the water hydraulic directional valve possesses good property, its pressure loss is 1.1 MPa lower, switching time is shorter than 0.025 s, and its strike crest is 0.8 MPa lower. The valve possess fine dynamic performance with the characteristic rapidly action and lower implusion. 相似文献
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介绍了龙门铣床横梁、滑枕液压自动平衡系统的工作原理。着重分析了龙门铣床在上移、停止、下移3种工况下溢流型三通减压阀在平衡横梁自重过程中的工作机理,对三通减压阀的减压过程、溢流过程分别建立状态方程,同时给出了三通减压阀控制平衡油缸的动态过程数学模型,完成了基于MATLAB SIMU-LINK软件包的平衡系统仿真。仿真结果表明基于三通减压阀的液压自动平衡系统能够较好地实现龙门铣床横梁、滑枕的自重平衡作用。 相似文献
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Unexpected variations in spring characteristics could affect the performance of discharge control valves. In this study, a novel experimental procedure was used to quantify the effects of the spring's elasticity coefficient and unloaded spring length on water delivery by the discharge control valve. Based on an average sensitivity index reflecting the performance of a given structure, the hydraulic behavior of the discharge control valve was quantified. The results indicate that the valve was sensitive to the unloaded spring length, especially when it was slightly smaller than its nominal value. The discharge control valve performance was affected no more than about 16% by ± 4% variation in spring elasticity. In general, spring elasticity variations affect the valve of the smaller design discharge more than that designed for a higher discharge value. The outcome of this study should help design and fabricate discharge control valves to enhance their performance. 相似文献