共查询到20条相似文献,搜索用时 125 毫秒
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1引言 目前欧美等发达国家将液压技术分为工业液压和行走液压两个领域。工业设备用液压技术(Industry hydraulic)简称工业液压,行走机械用液压技术(Mobile hydraulic)简称为行走液压。由于行走机械作业环境恶劣.再加上多数操作人员的液压技术知识较少、维修力量不足。所以对液压系统的质量和性能特别是工作可靠性要求就更高。目前市场上的大部分液压元件都属于工业液压元件,而行走液压技术在我国还处于引进和开发阶段。 相似文献
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行走机械液压驱动技术发展大观 总被引:13,自引:2,他引:11
广泛应用液压驱动技术是现代工程,农机、起重运输机械和军、民用特种车辆等行走机械的重要标志之一。一方面,这些主机自的发展促进了为之配套的液压驱动元件的进步;另一方面,正是因为在调节功能和安装的性能有了质的提高,行走机械液压驱动技术及其应用之所以能达到今天这样的深度和广度,是由于液压元件这样的机械基础件产业和它的用户即各种主机产业之间的存在着相互影响。相互促进的辩证关系的结果,也体现了现代工业产品专业 相似文献
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液力机械传动系统主要由液压泵、控制阀、变矩器、变速器和动力换挡变速阀等组成、其故障通常表现为行走无力或液压离合器接合不良。工作装置液压系统主要由液压泵、控制阀、液压马达和液压缸组成,其故障主要表现为液压马达的行走或回转无力、液压缸活塞的伸出和缩回迟缓。这两种系统故障的共同特点为:系统压力不足。[第一段] 相似文献
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介绍了行走机械液压污染物的危害及常用的过滤油方法。分析了行走机械液压系统滤油回路以及行走液压过滤装置安装的特殊性。重点介绍了行走机械液压的特殊过滤技术。 相似文献
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针对高空作业车行走在恶劣工况出现打滑现象,且在高速行走转弯时出现发动机掉速问题进行研究,从行走液压系统角度进行分析。分别设计了大小阻尼切换防滑液压系统,双闭式行走泵防滑液压系统和主动浮动防滑液压系统。正确合理设计行走防滑液压系统,对高空作业车行走安全稳定性具有重要意义。 相似文献
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主要介绍了湿喷机械手行走液压系统的工作原理和计算方法,重点分析了该系统中CA控制泵的详细工作原理,CA泵与行走液压马达的行走参数匹配计算,转向器及制动器的选型计算等。 相似文献
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Digital switched hydraulics 总被引:1,自引:0,他引:1
This paper reviews recent developments in digital switched hydraulics particularly the switched inertance hydraulic systems (SIHSs). The performance of SIHSs is presented in brief with a discussion of several possible configurations and control strategies. The soft switching technology and high-speed switching valve design techniques are discussed. Challenges and recommendations are given based on the current research achievements. 相似文献
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全国液压气动标准化技术委员会秘书处 《液压与气动》2000,(1):53-55
1999年液压气动标准化工作在全国液压气动标准化技术委员会(以下简称全国液标委)的组织和指导下,在行业协会的大力支持及企业的积极参与下,围绕标准制修订的工作重点全面开展。现将有关情况做一简要介绍。1 标准制修订工作根据全国液标委的工作计划,今年的工作重点是标准... 相似文献
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This communication presents the approaches set up for processing spinner flowmeter well logs in vertical wells with a single fluid phase, which is the most widely used in assessing wells productivity. These focus on improving the pipe hydraulics relationships so that the different fluid inputs throughout the well can be quantified. Since vertical flow inside wells varies with depth between laminar flows (very low Reynolds number, i.e. Re < 103) and turbulent (Re > 4·103) the aim has been to reduce the uncertainty in the transition interval. Starting from bibliographical data and/or well-known formulas for laminar and for turbulent flow, several continuous relationships have been developed for any regime: 1) an expression for the radial distribution of velocity inside the pipeline (velocity profile) was developed. 2) A relationship between the average velocity and the velocity at the axis (velocity factor) was created. 3) A third equation was generated to obtain the friction factor in smooth pipes (and starting from this, a new explicit equation for rough pipes). The purpose has been to have a set of empirical expressions of easy and continuous application for any regime, as an alternative to the use of computer simulations. 相似文献
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经过5年的研发,Atos公司现在能给所有电子液压比例阀件配套一体化数字式的电子器件.这些产品能赋予传统控制体系新的功能。它的基本功能是使新型紧凑的机器带有更高技术含量。数字电子器件集成了多种逻辑和控制功能(分布智能),且使大部分现代现场总线通讯系统变成可行和便宜. 相似文献
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Wastewater hydraulics problems are frequently addressed by investigation on physical models. Dimensional analysis is a powerful tool that allows discovering essential information about the investigated phenomenon, but in some cases it is affected by significant limitations. In such cases, many issues can be addressed by means of machine learning algorithms, resulting from the theories on pattern recognition and computational learning. In order to show the potential of such an approach, in this study Regression Tree M5P model, Bagging algorithm and Random Forest algorithm were applied to the solution of some complex problems of wastewater engineering: the prediction of energy loss, the pool depth, the air entrainment in a drop manhole, and the forecasting of the lateral outflow in a low crested side weir. The algorithms were trained and tested on data obtained from experimental tests that were carried out at the Water Engineering Laboratory of the University of Cassino and Southern Lazio. In most of the considered cases, regression trees and ensemble methods were able to provide very accurate predictions. 相似文献