As the demand for their high quality and good outline is increasing , the hydraulic control system of molding machine must be able to offer accurate pressure and flow control at the same time to its injection system 集压力、流量比例调节于一体的电液比例压力流量复合控制阀(简称pq阀)以其复合程度高、控制性能好、节能等特点在注塑机液压控制系统中得到了日益广泛的应用。
For farther exploring the application of electrorheological ( er ) technology on hydraulic control system , this paper takes theoretical and practical study on er valves and er valve - control system by contrast with traditional hydraulic valve - control system 为进一步探索电流变技术在液压控制中的应用,以与传统液压阀控系统对比的方式对电流变阀和电流阀控系统进行了理论和实验上的研究。
But sometimes self - excited oscillations and noise may appear in hydraulic flapper - nozzle servo - valve if its construction is not selected very correctly . if self - excited oscillations and noise appear in hydraulic servo - valve , the performance of hydraulic control systems may lose stability 因它具有非常快的响应速度,所以是目前应用最广泛的伺服阀,但它也存在自激现象,容易产生自激噪声和振荡,严重影响伺服控制系统的稳定性。
Water hydraulics will take place of oil hydraulics step by step . spool valves and poppet valves are not only the key components but also the main components for energy loss , so the property of water hydraulic valves is significant for water hydraulic control system 在水压控制系统中,滑阀和锥阀是构成水压控制系统不可缺少的元件,同时水压阀也是产生能耗的一类主要元件,因此水压阀的性能对整个系统的性能起着至关重要的作用。
The subsea wellhead production system , named building block subsea system , adopts the most advanced technologies in the world , including the subsea horizontal christmas tree , electro - hydraulic control system , mudline booster pump , umbilical assembly , host , and rov , etc 被称为“组块搭接式控制系统”的水下井口生产系统,荟萃了当今世界的尖端技术,包括双定位水下卧式采油树、电/液控制系统、泥线增压泵、电缆系统、折叠式钻井底盘系统和遥控作业机器人等。
At the same time point out that the key of the development of the construction machine technology lies in further improving all kinds of performance index of its electric hydraulic control system , however the difficulty is just that the communication mode and data information process 本文首先分析了国内外工程机械和控制工程的发展现状,指出进一步提升其中电液控制系统各项性能指标是工程机械技术发展的关键所在,而其中瓶颈就是通信方式和数字信息处理。
Remote control construction machinery will be more and more widely used along with development of technique and perfection of function of wireless control system and electro - hydraulic control system . the remote controlled trimming dozer is remotely controlled by signal that is transferred by electromagnetic wave and sent into driver - electro - hydraulic control system 随着无线电控制系统和电液控制系统的技术发展和功能完善,遥控型工程机械应用范围将越来越广泛,遥控型推耙机通过电磁波传输控制信号并将控制信号送入驱动执行器?电液比例控制系统以实现远距离控制。
In addition to military products , criaa designed & manufactured many kinds of industrial products such as ff series servovalves , lpg recovery plant , airport hydrant refuelling equipments , hydraulic pump stations , hydraulic control system and testing equipments , low temperature box with natural air cooling , and air refrigerators used for mines etc 产品除军用外,开发的民品有: ff系列伺服阀、油田气轻烃回收装置、机场栓式加油设备、液压控制系统产品及试验设备、空气制冷低温箱、矿用空气制冷机等。
According to the present problems and developing tendency of hydraulic turbine governor , four main issues of this field are studied in this paper . the content include hydraulic control system , frequency measurement unit , stability of the discrete control system , optimization of control parameters and self - adjusting pid control strategy based on fuzzy logic . several main achievement and results are obtained and shown as follows : the electric - hydraulic pilot valve driven by step - motor is firstly proposed , which solves the problem that the electric - hydraulic converter of hydraulic turbine governor hydraulic servo is prone to be stuck and blocked and improves the systemic stability greatly 本文根据水轮机调节领域存在的问题和发展趋势,对水轮机调速器的液压控制系统、频率测量环节、离散调节系统稳定性与调节参数最优整定以及适应式参数自调整pid控制策略进行了研究,得到以下主要成果和结论:首次提出了采用步进电机驱动的步进式电液引导阀,从根本上解决了水轮机调速器电液随动系统中存在的电液转换元件发卡、堵塞问题,使电液随动系统的可靠性大大提高。
With the development of the ac servo system , there is a new electro - hydraulic servo system which is called direct drive electro - hydraulic servo system . this new system has many advantages such as better controlled ability , higher efficiency , smaller bulk , simpler construction and energy saving . so it is widely considered to be one of the most important developing directions of the hydraulic control system 随着交流伺服技术的发展,出现了一种新型的电液伺服系统? ?直驱式电液伺服系统,它具有电动机控制的灵活性和液压系统出力大的双重优点,具有高效节能、体积小、可靠性高等显著优点,被认为是液压控制系统的重要发展方向之一。