【摘要】：分流比負載敏感多路閥是一種用于工程機械及其他多執(zhí)行器機械節(jié)能型液壓系統(tǒng)的負載敏感多路閥,它極大地改善了多執(zhí)行器同時工作時的速度協(xié)調(diào)性問題,當負載所需流量大于系統(tǒng)最大流量時,各執(zhí)行器按閥桿行程成比例地分配流量,以保證各執(zhí)行器運行的協(xié)調(diào)性。本課題對一種具有小負載自動補償?shù)姆至鞅蓉撦d敏感多路閥進行研究。本文的研究內(nèi)容主要有以下四個部分組成： 1.原理研究。通過分析現(xiàn)有經(jīng)典的分流比負載敏感多路閥工作原理,發(fā)現(xiàn)它們在最大負載壓力接近系統(tǒng)最大壓力時存在的缺陷,研究了一種具有小負載自動補償?shù)姆至鞅蓉撦d敏感多路閥,并從原理上論證了該方案不僅具有經(jīng)典的分流比負載敏感多路閥的一切特性,而且還具有小負載自動補償性能。 2.結(jié)構(gòu)設(shè)計。在分析現(xiàn)有分流比負載敏感多路閥結(jié)構(gòu)的基礎(chǔ)上,繪制出具有小負載自動補償?shù)姆至鞅蓉撦d敏感多路閥結(jié)構(gòu)圖,包括進油聯(lián)閥片、各聯(lián)負載閥片及負載敏感信號選擇閥片。然后對多路閥的閥芯、閥體配合間隙,流量的泄漏,節(jié)流口形狀、尺寸,閥口的面積曲線,彈簧的剛度、預壓縮量等關(guān)鍵參數(shù)進行設(shè)計。 3.系統(tǒng)建模和仿真分析。首先對該分流比負載敏感多路閥系統(tǒng)進行數(shù)學建模,主要包括先導閥建模、分流比負載敏感多路閥建模及負載敏感變量泵建模。然后運用現(xiàn)有軟件對該系統(tǒng)進行壓差相等特性、流量分流特性、流量抗飽和特性、小負載壓差自動補償特性等功能進行分析；對各閥芯泄漏量進行分析；主閥芯換向過程中制動、閥口突然關(guān)閉及最大負載的突變對主閥口壓差和流量的影響；主閥芯及二位三通換向閥閥芯的響應(yīng)速度分析。 4.優(yōu)化設(shè)計。對主閥芯彈簧剛度及預壓縮量、順序閥閥芯彈簧剛度及預壓縮量、二位三通換向閥閥芯彈簧剛度及預壓縮量進行優(yōu)化。
[Abstract]:Split ratio load-sensitive multi-circuit valve is a kind of load-sensitive multi-way valve used in the hydraulic system of construction machinery and other multi-actuator mechanical energy-saving type. It greatly improves the speed coordination of multi-actuator when it works at the same time. When the load demand is greater than the maximum flow of the system, the actuators distribute the flow proportionally according to the stroke of the valve stem, so as to ensure the coordination of the operation of the actuators. In this paper, a kind of load-sensitive multi-circuit valve with small load auto-compensation is studied. The main contents of this paper are as follows: 1. Principle research. Based on the analysis of the existing classical load-sensitive multi-channel valves, the defects of them when the maximum load pressure is close to the maximum pressure of the system are found, and a kind of load-sensitive multi-channel valve with small load auto-compensation is studied. It is demonstrated in principle that this scheme not only has all the characteristics of the classical load-sensitive multi-circuit valve, but also has the performance of automatic compensation for small load. 2. Structural design. Based on the analysis of the structure of the load-sensitive multi-circuit valve, the structure diagram of the load-sensitive multi-circuit valve with small load auto-compensation is drawn, including the inlet valve plate, each load valve piece and the load sensitive signal selection valve plate. Then the key parameters such as valve core, valve body fit clearance, flow leakage, throttle shape, size, area curve of valve port, spring stiffness, pre-compression and other key parameters are designed. 3. System modeling and simulation analysis. Firstly, the mathematical modeling of the shunt ratio load-sensitive multi-channel valve system is carried out, including pilot valve modeling, load-sensitive multi-path valve modeling and load sensitive variable pump modeling. Then the current software is used to analyze the function of the system, such as pressure difference equal characteristic, flow shunt characteristic, flow anti-saturation characteristic, small load pressure difference automatic compensation characteristic and so on, and the leakage quantity of each valve core is analyzed. The effect of brake, sudden closing of valve port and sudden change of maximum load on the pressure difference and flow rate of main valve core in the course of changing direction of main valve core, and the response speed analysis of main valve core and two-position and three-way reversing valve core. 4. optimal design銆，

本文編號：2450810