新型液压平衡阀关键结构参数对系统性能影响的研究

发布时间：2018-09-10 20:38

【摘要】：作为液压系统中重要的液压元件,液压平衡阀在现代工程机械的液压平衡回路中被广泛应用。国内的液压平衡阀普遍存在着低频抖动、控制压力偏高、工作平稳性及安全性较差、系统功率损失严重等问题。因此借鉴布赫、力士乐等公司产品的先进经验,消化、吸收其关键技术对提升我国工程机械产品性能十分重要。本文对我国工程机械产品中现用的国产液压平衡阀和平衡回路进行了研究,在借鉴和学习国际先进液压平衡阀研制经验的基础上,对我国近来开发的一种新型液压平衡阀进行了一系列的理论分析和实验研究。首先介绍了该种新型平衡阀的结构特点与工作原理,建立了该阀的初步分析理论模型,找出了该阀中影响工程机械产品应用性能的主要因素,然后利用AMESim软件建立了所研究的液压平衡阀系统的仿真模型,为验证仿真模型设计了该系统的实验方案,搭建了试验平台,通过试验进一步验证了仿真模型的正确性,并在此基础上对新型液压平衡阀影响工程机械平衡系统性能的重要因素进行了大量的仿真分析,重点分析研究了负载压力、先导阀芯阻尼孔、导阀弹簧刚度等关键参数的变化对系统控制压力与流量的影响,得出一些有益的结果,为新型平衡阀进一步的优化设计和制造奠定了理论依据。
[Abstract]:As an important hydraulic component in hydraulic system, hydraulic balancing valve is widely used in hydraulic balancing circuit of modern construction machinery. There are many problems such as low frequency jitter, high control pressure, poor stability and safety, serious power loss and so on. Therefore, it is very important to use the advanced experience of Buhe, Rexroth and other companies for reference, digest and absorb the key technology to improve the performance of construction machinery products in China. In this paper, the domestic hydraulic balance valve and balance circuit used in China construction machinery products are studied. Based on the experience of international advanced hydraulic balance valve development, A series of theoretical analysis and experimental research on a new hydraulic balancing valve developed recently in China are carried out. Firstly, the structure characteristics and working principle of the new type of balanced valve are introduced, the preliminary theoretical model of the valve is established, and the main factors influencing the application performance of the construction machinery product are found out. Then the simulation model of the hydraulic balance valve system is established by using AMESim software. The experimental scheme of the system is designed to verify the simulation model, and the test platform is built, and the correctness of the simulation model is further verified by the experiment. On this basis, a large number of simulation analysis is carried out on the important factors that affect the performance of the new hydraulic balancing valve, especially the load pressure and the damping hole of the pilot valve core. The influence of the key parameters such as spring stiffness of the guide valve on the control pressure and flow rate of the system has been obtained and some useful results have been obtained which have laid a theoretical foundation for the further optimum design and manufacture of the new balanced valve.
【学位授予单位】：郑州大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TH137.52

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