动圈式双向电机械转换器驱动的电液比例阀

发布时间：2018-11-17 14:26

【摘要】：随着电液比例控制技术的迅速发展,电液比例阀在工程中的应用越来越广泛。与电液伺服阀相比,电液比例阀的抗污染能力强,可以明显提高工作系统的稳定性,有效地减少工作障碍。它的成本相对较低,没有精密、敏感的零件,更适用于工业工程,但是在响应速度和控制精度等方面仍有不足。为提高电液比例阀的动态性能和静态性能,本论文提出一种新型结构的电液比例阀,其驱动部分采用动圈式双向电机械转换器。其创新点是采用单比例电磁铁实现双向驱动阀芯移动,以提高电液比例阀的动静态性能指标,这种动圈式双向电机械转换器驱动的电液比例阀对新型电液比例阀的研究有积极意义。本论文的主要研究工作如下:1)对动圈式双向电机械转换器的结构、接线方式及电路进行分析研究,同时对其主要零件所用材料做了选定;2)阐述了阀体结构及阀芯的滑阀机能,对其工作原理进行了说明,并选定了所采用的阀体与阀芯;3)根据电液比例阀的对中与调零要求,设计了调零端,同时依据对弹簧的要求确定其具体参数;4)设计了电液比例阀的密封结构及方式,根据国标确定了O型圈的材料及尺寸参数;5)对一些有较高加工精度的零件做了详细说明,保证它的尺寸精度、形状精度及配合精度;6)分析并设计了动圈式双向电机械转换器与阀芯的连接方式;7)对动圈式双向电机械转换器F-i、F-s的特性、阀芯受力进行了分析研究,进而对电液比例阀的流量进行分析,得出输出流量与输入信号之间的关系;8)研制样机,对样机装配过程中需要注意的问题做了详细说明;9)建立液压试验台对样机进行试验,根据试验结果分析样机阀芯受到很大的摩擦力,提出改善方法;10)设计了一种独立叠加颤振信号的控制方法,重新建立试验台对样机进行试验,整理实验数据,计算样机的滞环、死区、线性度等性能指标,得出结论:动圈式双向电机械转换器驱动的电液比例阀基本满足了电液比例方向阀的性能,同时可以满足工程需求,其滞环、死区、线性度等指标相对较好。
[Abstract]:With the rapid development of electro-hydraulic proportional control technology, electro-hydraulic proportional valve is more and more widely used in engineering. Compared with the electro-hydraulic servo valve, the electro-hydraulic proportional valve has strong anti-pollution ability, which can obviously improve the stability of the working system and effectively reduce the working obstacles. Its cost is relatively low, there are no precise and sensitive parts, it is more suitable for industrial engineering, but it still has some shortcomings in response speed and control precision. In order to improve the dynamic and static performance of electro-hydraulic proportional valve, a new type of electro-hydraulic proportional valve is proposed in this paper. Its innovation point is to use single proportional electromagnet to realize bi-directional drive valve core movement, in order to improve the dynamic and static performance index of electro-hydraulic proportional valve. The electro-hydraulic proportional valve driven by the moving coil bidirectional electromechanical converter is of great significance to the study of the new type of electro-hydraulic proportional valve. The main research work of this thesis is as follows: 1) the structure, connection mode and circuit of the moving coil bidirectional electromechanical converter are analyzed, and the materials used in the main parts are selected. 2) the structure of the valve body and the function of the slide valve of the spool are expounded, its working principle is explained, and the body and the spool are selected; 3) according to the requirements of center and zero adjustment of electro-hydraulic proportional valve, the zero adjusting end is designed, and its specific parameters are determined according to the requirement of spring. 4) the sealing structure and mode of electro-hydraulic proportional valve are designed, and the material and dimension parameters of O-ring are determined according to the national standard. 5) some parts with high machining accuracy are described in detail to ensure its dimensional accuracy, shape accuracy and matching accuracy. 6) the connection mode between the movable coil bidirectional electromechanical converter and the valve core is analyzed and designed. 7) the characteristics and the force of the valve core of the moving coil bidirectional electromechanical converter (F-I / F) are analyzed, and then the flow rate of the electro-hydraulic proportional valve is analyzed, and the relationship between the output flow and the input signal is obtained. 8) the problems needing attention in the assembly process of the prototype are explained in detail, 9) the hydraulic test bench is set up to test the prototype, according to the test results, the friction of the valve core of the prototype is analyzed, and the improvement method is put forward. 10) A control method of independent superposition flutter signal is designed. The test bench is set up again to test the prototype, to arrange the experimental data, to calculate the hysteretic loop, dead zone and linearity of the prototype, and to calculate the performance index of the prototype, such as hysteretic loop, dead zone, linearity, etc. It is concluded that the electro-hydraulic proportional valve driven by the moving coil bidirectional electromechanical converter can basically satisfy the performance of the electro-hydraulic proportional directional valve, and can meet the engineering requirements. The hysteretic loop, dead zone and linearity of the valve are relatively good.
【学位授予单位】：太原理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TH137.52

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