插装式电液比例流量阀的特性研究

发布时间：2018-06-13 17:41

本文选题：电闭环 + 比例流量阀　；参考：《太原理工大学》2011年硕士论文

【摘要】：随着电液比例控制技术的迅速发展,作为其核心元件的电液比例流量阀在工业生产中得到越来越广泛的应用。这就要求电液比例流量阀具有优良控制精度和动态响应特性的同时,尽可能的降低技术复杂性、制造难度和成本。本文在对比例流量阀的功能、类型和国内外研究现状进行研究的基础上,针对目前电子闭环控制阀在开环控制下不能工作的问题设计了一种插装式电闭环比例节流阀,首先介绍了该阀的工作原理和结构,并应用仿真软件SimulationX对阀进行建模与仿真分析,研究其静、动态特性,确定了阀的主要结构参数。仿真结果表明,该阀不仅结构简单,而且控制精度与动态响应特性得到了明显改善,提高了系统的可靠性。在负载变化不大的场合中选用比较经济、合理。另外,本文还针对传统的压差补偿型比例调速阀中存在的缺点,即结构复杂,受液动力影响大,补偿特性差,存在负载压力阶跃响应的流量阶跃和起动流量阶跃效应等问题。现利用Valvistor型液压插装阀的流量放大特性,即主阀流量与先导阀流量成线性关系的特点,设计了一种插装式压差补偿型比例调速阀。在主阀和先导阀之间增设先导减压阀对先导阀口的压差进行补偿,就可实现输入信号对于主阀输出流量的单调控制,而且放大倍数可以方便的进行调整。由于采用了常闭结构,可以消除传统的压差补偿型流量控制阀固有的流量冲击和超调。结构上更合理、更简单,而且补偿特性好,等流量特性得到了显著提高。
[Abstract]:With the rapid development of electro-hydraulic proportional control technology, the electro-hydraulic proportional flow valve, which is the core component of the valve, has been more and more widely used in industrial production. This requires that the electro-hydraulic proportional flow valve has good control accuracy and dynamic response characteristics, while minimizing the technical complexity, manufacturing difficulty and cost. Based on the research of the function, type and research status of proportional flow valve at home and abroad, this paper designs a kind of electrical closed loop proportional throttle valve which can not work under the open loop control of electronic closed loop control valve. Firstly, the working principle and structure of the valve are introduced, and the simulation software SimulationX is used to model and simulate the valve. The static and dynamic characteristics of the valve are studied, and the main structural parameters of the valve are determined. The simulation results show that the valve is not only simple in structure, but also the control accuracy and dynamic response characteristics have been improved obviously, and the reliability of the system has been improved. It is more economical and reasonable to choose in the situation where the load changes little. In addition, this paper also aims at the shortcomings of the traditional pressure differential compensation proportional speed regulating valve, that is, the structure is complex, the influence of hydraulic power is great, the compensation characteristic is poor, and the flow step and the starting flow step effect of the load pressure step response exist. Based on the characteristics of Valvistor type hydraulic cartridge valve, that is, the linear relationship between the main valve flow and the pilot valve flow, a type of proportional speed regulating valve with pressure difference compensation is designed. The pressure-reducing valve is added between the main valve and the pilot valve to compensate the pressure difference of the pilot valve, so that the input signal can control the output flow rate of the main valve monotonously, and the magnification can be adjusted conveniently. Because of the constant closed structure, the flow impact and overshoot inherent in the traditional pressure differential compensation flow control valve can be eliminated. The structure is more reasonable and simpler, and the compensation characteristic is better, and the equal flow characteristic is improved significantly.
【学位授予单位】：太原理工大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH137.52

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