电控液动执行器的液压试验装置

针对电控液动执行器产品的研制与生产 ,设计了专用液压试验室 ,参照相关国家标准 ,对整机及主要零部件进行各项检验 ,这对其课题的鉴定及产品的产业化起到了至关重要的作用。文中介绍了该产品液压试验的有关情况。

电控液动浆液阀在选煤厂的应用

介绍了电控液动浆液阀的用途和特点，工作原理，与同类产品比较以及推广应用情况。

电容式位移传感器在电控液动执行器中的应用

本文详细的讲述了电容式传感器在电控液动执行器中的应用，包括传感平的结构、原理以及检测电路的原理和有关的实验数据，在使用过程中证明本传感器完全符合电控液动执行器的技术指标。

BDY-9电控液动滑阀控制系统的技术改造

分析了BDY-9电控液动滑阀控制系统保护功能在实际应用中存在的问题,探讨了影响该控制系统稳定性的主要因素,并对控制系统的技术改造进行了论述。

电控液动远程节流阀控制系统

大规模加砂压裂排液过程中,用于节流降压的节流阀常存在本体耐腐蚀性弱,造成阀体易损坏、节流阀失效,以及油嘴调节精度不能满足实际需要的情况。根据常规节流阀结构及工作特点,研制出电控液动远程节流阀控制系统。采用电控液的方式,节流阀阀位传感器接收信号,系统自动控制比例电磁阀的阀芯开口度,调整高压液体流量,实现对管汇节流阀的开大或关小的速度及位置控制;若遇现场电源中断,还可由电动模式切换到手动模式,不影响正常施工。2019年,经在大庆深层气井上应用,对节流阀进行远程精确调控,提高了节流阀应用的安全性,实现了连续排液精细控砂。该系统可确保连续施工,降低加砂压裂排液过程的风险,确保排液求产过程的顺利进行。

DK-YZ型电控液动执行机构的原理与调试

文章介绍了DK -YZ型电控液动执行机构的结构、工作原理。

电控液动执行机构的液压控制理论研究

给出了电控液动执行机构泵控液压缸的基本方程和传递函数，分析了各主要参数对系统的稳定性、精度和响应特性的影响。

电控液动执行机构的液压系统研究

电控液动执行机构是一种自动化程度较高的液压动力直行程自动执行机构 ,采用泵控液压缸作为液压动力方式 ,主要用于驱动阀门启闭。本文论述了该产品的液压控制原理、结构设计方案以及应用分析。

一种适用于液动阀门的手自一体电控液动执行机构

在一般工况企业中,阀门的驱动方式主要有手动（包括齿轮传动）、电动、气动和液动等,用户根据各自的条件选择不同的阀门驱动方式.80年代初期,为适应选煤行业的恶劣工况及日益提高的自动化要求,研制了液动阀门驱动装置一电控液动执行机构.该执行机构集机、电、液于一体,适用于驱动带介质压力启闭的阀门.历经20余年的研究开发,经过大量的试验室试验和工业性试验,电控液动执行机构的技术已日趋成熟.

基于PLC的电液控制系统设计

为满足不断增长的大型产品部件的生产及采用大型部件施工的需求,研制了130 t 重型平台运输车。阐述了该车所要求的升降、转向模式,采用可编程序控制器(PLC)开发了各模式的电控液动随动控制系统,设计了适合于双驾驶室的电气控制电路,并对转向系统做了实验室模拟。为整车控制系统的制造及调试提供了可靠的依据。

动筛跳汰机透筛物料排放方法比较

选煤厂采用动筛跳汰机对块煤排矸时,跳汰机细粒透筛物料可通过脱水斗式提升机或电控液动平板闸门两种方法回收,对比分析了两种方法的工艺布置形式、配套方式、适应的煤质以及生产过程中存在的优缺点;建议采用脱水斗式提升机回收细粒物料。

矿井排水工程设计及相关问题分析

介绍了大型矿井通风设备MD、PJ、MD(P)的性能和结构特点,电动闸阀、电控液动闸阀、微阻缓闭止回阀的性能和结构特点,分析了矿井排水的水锤、汽蚀和平衡盘故障等主要问题,并给出了解决方法。

汽车AMT技术发展及其应用

作为汽车关键总成之一,变速器技术在汽车诞生的百年历史中在不断地与时俱进。手动变速器由于其传递动力的直接与高效性,加上制作技术的成熟与低成本,现代汽车中装备手动变速器的汽车仍然占有很大比例。但随着人们对汽车舒适性要求越来越高,现代汽车自动变速器装备率越来越高却是一个不争的事实,尤其是当自动变速器也逐渐能够兼顾操控性的时候。在国内车市,自动变速器在乘用车当中越来越普及的同时,技术与种类也是越来越丰富,自动变速器的技术甚至成为厂家产品的竞争利器。本文着重介绍了汽车AMT技术的发展趋势以及国内汽车AMT技术的发展与应用.

Dynamic characteristics of hydraulic power steering system with accumulator in load-haul-dump vehicle

Using hydraulic power steering system of model EIMCO 922 load-haul-dump vehicle as a simulation example, the dynamic characteristics of hydraulic power steering system in load-haul-dump vehicle were simulated and discussed with SIMULINK software and hydraulic control theory. The results show that the dynamic characteristics of hydraulic power steering system are improved obviously by using bladder accumulator, the hydraulic power steering system of model EIMCO 922 load-haul-dump vehicle generates vibration at the initial stage under the normal steering condition of pulse input, and its static response time is 0.25 s shorter than that without bladder accumulator. Under the normal steering working condition, the capacity of steering accumulator for absorbing pulse is directly proportional to the cross section area of connecting pipeline, and inversely proportional to the length of connecting pipeline. At the same time, the precharge pressure of nitrogen in steering accumulator should be 60%80% of the rated minimum working pressure of hydraulic power steering system. Under the abnormal steering working condition, the steering cylinder piston may obtain higher motion velocity, and the dynamic response velocity of hydraulic power steering system can be increased by reducing the pressure drop of hydraulic pipelines between the accumulator and steering cylinder and by increasing the rated pressure of hydraulic power steering system, but the dynamic characteristics of hydraulic power steering system in load-haul-dump vehicle have nothing to do with the precharge pressure of nitrogen in steering accumulator.

Improved control of intelligent excavator using proportional-integral-plus gain scheduling

Consider the design and implementation of an electro-hydraulic control system for a robotic excavator, namely the Lancaster University computerized and intelligent excavator (LUCIE). The excavator was developed to autonomously dig trenches without human intervention. One stumbling block is the achievement of adequate, accurate, quick and smooth movement under automatic control, which is difficult for traditional control algorithm, e.g. PI/PID. A gain scheduling design, based on the true digital proportional-integral-plus (PIP) control methodology, was utilized to regulate the nonlinear joint dynamics. Simulation and initial field tests both demonstrated the feasibility and robustness of proposed technique to the uncertainties of parameters, time delay and load disturbances, with the excavator arm directed along specified trajectories in a smooth, fast and accurate manner. The tracking error magnitudes for oblique straight line and horizontal straight line are less than 20 mm and 50 mm, respectively, while the velocity reaches 9 m/min.

Improving Bandwidth of Three-Stage Electro-Hydraulic Servo Valve Based on Speed-Feedback

In order to improve the dynamic response bandwidth of three-stage electro-hydraulic servo valve,a new method,speed-feedback control is presented in this paper.The construction and principle of three-stage electro-hydraulic servo valve are explained,and the mathematical model of three-stage electro-hydraulic servo valve is built in frequency domain.Experimental and simulation results show that the bandwidth compared with proportional control is improved under speed-feedback control.Moreover,the research results play an important role in developing high performance three-stage electro-hydraulic servo valve.

Disturbance observer based position tracking of electro-hydraulic actuator

A nonlinear controller based on an extended second-order disturbance observer is presented to track desired position for an electro-hydraulic single-rod actuator in the presence of both external disturbances and parameter uncertainties. The proposed extended second-order disturbance observer deals with not only the external perturbations, but also parameter uncertainties which are commonly regarded as lumped disturbances in previous researches. Besides, the outer position tracking loop is designed with cylinder load pressure as output; and the inner pressure control loop provides the hydraulic actuator the characteristic of a force generator. The stability of the closed-loop system is provided based on Lyapunov theory. The performance of the controller is verified through simulations and experiments. The results demonstrate that the proposed nonlinear position tracking controller, together with the extended second-order disturbance observer, gives an excellent tracking performance in the presence of parameter uncertainties and external disturbance.

Synchronization control for electro-hydraulic dual-cylinder system based on force/position switching

If the rigidity of a mechanism is stiff enough, the position synchronous error of the two cylinders driving one degree-of-freedom （DOF） of the mechanism may be less than the resolution of position sensors. To handle this synchronization problem this paper proposes a force/position switching scheme, which partitions the two cylinders into a master cylinder and a slave cylinder. The master cylinder is always position tracking controlled by a second-order sliding mode controller and the slave cylinder is integrated with a force tracking controller which is a first order sliding mode controller. When the position tracking error is less than a given value, the slave cylinder switches to be force controlled. Two synchronization control methods are presented based on the switching scheme： the master - master ＋ force/position switching control and the master - slave ＋ force/position switching control. Simulations show that the formance compared with two given proposed synchronization control position-based control methods. methods can get a better per-

空客A320飞机货舱门操作故障的分析与排除

空客A320飞机货舱门的操作由电控液压作动,在运行中是常出现故障的系统之一。货舱门的操作没有专用计算机控制和监控,无法快速获取相应的故障信息,只能根据故障现象具体分析才能排除故障。本文详细讲述空客A320s飞机货舱门的控制原理以及分析、判断故障的过程,并制作了逻辑判断筛选表,为精准、高效排除类似故障提供有力支持。