【摘要】：隨著電液比例控制技術的迅速發(fā)展,電液比例閥在工程中的應用越來越廣泛。與電液伺服閥相比,電液比例閥的抗污染能力強,可以明顯提高工作系統(tǒng)的穩(wěn)定性,有效地減少工作障礙。它的成本相對較低,沒有精密、敏感的零件,更適用于工業(yè)工程,但是在響應速度和控制精度等方面仍有不足。為提高電液比例閥的動態(tài)性能和靜態(tài)性能,本論文提出一種新型結構的電液比例閥,其驅動部分采用動圈式雙向電機械轉換器。其創(chuàng)新點是采用單比例電磁鐵實現雙向驅動閥芯移動,以提高電液比例閥的動靜態(tài)性能指標,這種動圈式雙向電機械轉換器驅動的電液比例閥對新型電液比例閥的研究有積極意義。本論文的主要研究工作如下:1)對動圈式雙向電機械轉換器的結構、接線方式及電路進行分析研究,同時對其主要零件所用材料做了選定;2)闡述了閥體結構及閥芯的滑閥機能,對其工作原理進行了說明,并選定了所采用的閥體與閥芯;3)根據電液比例閥的對中與調零要求,設計了調零端,同時依據對彈簧的要求確定其具體參數;4)設計了電液比例閥的密封結構及方式,根據國標確定了O型圈的材料及尺寸參數;5)對一些有較高加工精度的零件做了詳細說明,保證它的尺寸精度、形狀精度及配合精度;6)分析并設計了動圈式雙向電機械轉換器與閥芯的連接方式;7)對動圈式雙向電機械轉換器F-i、F-s的特性、閥芯受力進行了分析研究,進而對電液比例閥的流量進行分析,得出輸出流量與輸入信號之間的關系;8)研制樣機,對樣機裝配過程中需要注意的問題做了詳細說明;9)建立液壓試驗臺對樣機進行試驗,根據試驗結果分析樣機閥芯受到很大的摩擦力,提出改善方法;10)設計了一種獨立疊加顫振信號的控制方法,重新建立試驗臺對樣機進行試驗,整理實驗數據,計算樣機的滯環(huán)、死區(qū)、線性度等性能指標,得出結論:動圈式雙向電機械轉換器驅動的電液比例閥基本滿足了電液比例方向閥的性能,同時可以滿足工程需求,其滯環(huán)、死區(qū)、線性度等指標相對較好。
[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.
【學位授予單位】：太原理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TH137.52

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