【作者】 韩新苗；

【导师】 聂松林；

【作者基本信息】 华中科技大学 ， 机械电子工程， 2009， 硕士

【摘要】 液压传动具有控制灵活、快速性好、容易获得很大的力和力矩、能无级调速、易于实现过载保护、操作方便等优点,而水压控制阀是液压系统中重要的元件之一,它的可靠性直接影响到系统的稳定性,所以进行阀的可靠性研究工作很有必要。首先,本文以油压溢流阀的设计方法为基础,并考虑到海水传动介质的特殊性,提出了水压溢流阀的设计方法,论述了水压溢流阀的设计理论、方法与传统油压阀的异同,提出了水压控制阀存在的关键技术难点,并就这些难点提出了解决办法,再详细介绍了阀的结构,说明了该阀的设计过程,接着,本文介绍了一些耐海水腐蚀的新型工程材料如耐蚀合金(渗氮17-4PH和1Cr18Ni9Ti)、工程塑料(TX、PEEK和PTFE)、工程陶瓷(氧化铝和氧化锆),并研究了金属的两种表面处理技术,然后对这三类材料两两之间摩擦副配对,再在不同压力与不同转速下进行摩擦磨损试验,研究材料的摩擦力和磨损情况,以期找到高性能的摩擦副材料。然后,对溢流阀的元件进行了可靠性算例分析,建立水液压控制阀中关键元件的不确定可靠性计算模型。由于实际中数据的有限性和参数的不确定性,只能得到参数的区间,所以本文介绍了区间-随机混合可靠性模型,并把这种模型运用到水压控制阀中,分析阀的阀座结构的可靠性,计算了它的可靠度。以期能从设计上提高阀的可靠性。接着,基于AMESim软件对阀的静、动态特性作了详细的分析,分析了阀的结构参数对阀性能的影响,使阀的结构参数最优化。最后,提出了试验原理和试验方法,对研制的阀进行了试验,进行了阀的静动态特性研究,并说明了阀中存在的问题及提出了改进方案。更多还原

【Abstract】 Hydraulic transmission has the merits of flexible control, fast response, convenient operation, easy access to large force and moment, stepless speed regulation, easy to achieve overload protection, ect. Water hydraulic control valve is one of the most important components in water hydraulic system. The research of its reliability directly affects the stability of the system, as a result, it is quite necessary to carry out the research.Firstly, based on the design method of the oil hydraulic pressure relief valve, simultaneously considering the special characteristic of sea water, a design method of water hydraulic pressure relief valve is proposed in this paper. The sameness and difference in design theory between the oil and water hydraulic pressure relief valve is discussed in detail, the critical technical difficulty is proposed. And the corresponding solution is brought forward. Then, the paper detailedly introduces the structure of the valve, explains the design process. Afterward, some new engineering materials resistanting sea water erosion are introduced in the paper, such as corrosion resistant alloys (Nitriding 17-4PH and 1Cr18Ni9Ti), engineering plastic (TX, PEEK, and PTFE), engineering ceramic (Al2O3 and ZrO2). Two ways of surface treatment technology are researched. Then these three types of materials are composed friction pairs between two of them, the friction and wear experiments are carried out in different pressure and different rotating speed, in order to find out friction pair materials with high performance.Then, reliability analysis is processed on the pressure relief valve to establish an uncertainty reliability calculation model of the critical components in water hydraulic control valve. On account of the limitation of data and uncertainty of parameter in actual, it only can gain parameter intervals, this paper introduced interval-stochastic mixed reliability model. And the model is used in water hydraulic control valve, the reliability of valve seat is analyzed, in order to improve the reliability in design.Thirdly, AMESim software is used to analyze the static and dynamic characteristics of the valve, the effect of the structural parameter on its performance, which makes the optimization of the parameter.Finally, the experiment method of the valve is introduced, and experiments are carried out to research the static and dynamic characteristics. The problems appeared in the valve and the solutions are illuminated.更多还原