發(fā)布時間：2019-03-16 22:08

【摘要】：本文根據(jù)國內(nèi)外挖掘機節(jié)能技術(shù)發(fā)展現(xiàn)狀,在闡述挖掘機液壓系統(tǒng)流量控制方式的基礎(chǔ)上,對挖掘機正流量控制系統(tǒng)原理進行重點分析,主要研究正流量控制系統(tǒng)的節(jié)能效率問題。傳統(tǒng)正流量控制系統(tǒng)采用梭閥組比較出各先導壓力中的最高壓力控制變量泵的排量,并沒有根據(jù)各執(zhí)行機構(gòu)所需的實際流量控制變量泵的排量,導致變量泵的實際流量往往大于執(zhí)行機構(gòu)的所需流量,造成系統(tǒng)能量損失大、功率利用率低,而且使用一系列的梭閥組使系統(tǒng)結(jié)構(gòu)復雜。為了進一步提高正流量控制系統(tǒng)的節(jié)能效率,提出一種新型合成式正流量控制系統(tǒng),該系統(tǒng)利用各先導壓力的合力綜合控制變量泵排量,達到變量泵輸出流量與執(zhí)行機構(gòu)所需流量相等的目的。在分析傳統(tǒng)正流量控制系統(tǒng)和合成式正流量控制系統(tǒng)原理的基礎(chǔ)上,建立兩者的數(shù)學模型,利用Simulink軟件對兩種控制系統(tǒng)的階躍響應(yīng)情況加以分析,同時在AMESim環(huán)境中建立兩者的工作機構(gòu)模型,對兩種系統(tǒng)在工作機構(gòu)復合動作時變量泵輸出的流量和功率進行對比分析。仿真結(jié)果表明,合成式正流量控制系統(tǒng)的響應(yīng)速度較傳統(tǒng)正流量控制系統(tǒng)要快,在對多個執(zhí)行機構(gòu)復合動作仿真過程中,合成式正流量控制系統(tǒng)的變量泵輸出流量為傳統(tǒng)正流量控制系統(tǒng)的78.13%,其變量泵輸出功率為傳統(tǒng)正流量控制系統(tǒng)的70.28%。仿真結(jié)果表明合成式正流量控制系統(tǒng)較傳統(tǒng)正流量控制系統(tǒng)能量損失小、功率利用率高,節(jié)能效果好。
[Abstract]:According to the development of energy-saving technology of excavator at home and abroad, this paper mainly analyzes the principle of positive flow control system of excavator on the basis of expounding the flow control mode of hydraulic system of excavator. The energy saving efficiency of positive flow control system is studied in this paper. The traditional positive flow control system uses shuttle valve group to compare the displacement of the highest pressure control variable pump in each pilot pressure, and does not control the displacement of the variable pump according to the actual flow rate required by the actuators. As a result, the actual flow rate of variable pump is usually larger than that required by actuator, which results in large energy loss, low power utilization and complex system structure by using a series of shuttle valve groups. In order to further improve the energy saving efficiency of positive flow control system, a new type of composite positive flow control system is proposed. The system uses the force of each pilot pressure to control the displacement of variable pump. The output flow rate of the variable pump is equal to the flow rate required by the actuator. Based on the analysis of the principles of the traditional positive flow control system and the composite positive flow control system, the mathematical models of the two control systems are established, and the step response of the two control systems is analyzed by using Simulink software. At the same time, the working mechanism models of the two systems are established in the environment of AMESim, and the output flow and power of the variable pump under the combined action of the two systems are compared and analyzed. The simulation results show that the response speed of the composite positive flow control system is faster than that of the traditional positive flow control system. The output flow rate of the variable pump is 78.13% of that of the traditional positive flow control system, and the output power of the variable pump is 70.28% of that of the traditional positive flow control system. The simulation results show that the combined positive flow control system has lower energy loss, higher power utilization ratio and better energy saving effect than the traditional positive flow control system.
【學位授予單位】：遼寧工程技術(shù)大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TU621

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本文編號：2442003