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  本文關(guān)鍵詞：超越負載工況下平衡閥穩(wěn)定性研究　出處：《吉林大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 平衡閥 動態(tài)特性 AMESim仿真 穩(wěn)定性 卷揚液壓系統(tǒng)

【摘要】：液壓平衡閥是液壓平衡回路上，能夠產(chǎn)生一定的背壓，用于平衡超越負載工況下執(zhí)行元件的重量，防止執(zhí)行元件的運動部件因重力的影響而產(chǎn)生自由下落，造成嚴(yán)重事故，以達到控制執(zhí)行元件下降速度和提高液壓系統(tǒng)剛度的一種液壓元件。液壓平衡閥是液壓平衡回路實現(xiàn)平衡功能的關(guān)鍵性元件，，在平衡回路中能實現(xiàn)系統(tǒng)的平衡穩(wěn)定作用，它的性能直接影響著整個機器的工作平穩(wěn)性、可靠性和系統(tǒng)效率。 卷揚液壓系統(tǒng)是汽車起重機液壓系統(tǒng)中一個重要的子系統(tǒng)，其職能是實現(xiàn)重物的起升和下降。在重物下降的過程中，負載力和負載的運動方向相同，即超越負載工況，系統(tǒng)容易產(chǎn)生壓力沖擊，動態(tài)性能不穩(wěn)定。在關(guān)閉馬達變量，保持吊重不變的情況下，卷揚液壓系統(tǒng)的穩(wěn)定性的影響因素主要集中在卷揚系統(tǒng)中的平衡閥。因此，研究平衡閥的結(jié)構(gòu)參數(shù)和卷揚液壓系統(tǒng)穩(wěn)定性之間的關(guān)系具有理論和實際應(yīng)用的意義。 本文結(jié)合校企合作項目“國產(chǎn)平衡閥的改造”對平衡閥的結(jié)構(gòu)參數(shù)和汽車起重機卷揚系統(tǒng)穩(wěn)定性之間的關(guān)系展開研究。以超越負載工況下，卷揚系統(tǒng)重物下降抖動性為研究對象，基于AMESim（Advanced Modeling Environment for Simulations ofengineering systems）軟件仿真平臺分別建立了平衡閥和變量馬達以及由它們所構(gòu)成卷揚液壓系統(tǒng)的HCD(Hydraulic Component Design)模型，采用傳遞函數(shù)法，動態(tài)仿真分析以及實驗驗證的研究方法對卷揚液壓系統(tǒng)和平衡閥的結(jié)構(gòu)參數(shù)之間的關(guān)系進行了研究。本文的主要內(nèi)容有： （1）分別對幾種常見的平衡回路的工作原理、缺陷進行了分析；比較了國內(nèi)外平衡閥的發(fā)展現(xiàn)狀。 (2)介紹了oil control平衡閥的工作原理；基于傳遞函數(shù)法建立了單級式平衡閥的數(shù)學(xué)模型。 (3)采用元件級建模方式，分別建立了平衡閥和變量馬達的HCD模型。根據(jù)元件本身固有的特性，設(shè)置參數(shù)，驗證HCD模型的正確性。在模型正確的基礎(chǔ)上，搭建了卷揚液壓系統(tǒng)模型。 (4)設(shè)計了卷揚液壓系統(tǒng)動態(tài)性能測試方案，并進行了樣機實驗。主要對負載下降的過程，分別為零負載和10t負載，馬達負載口的壓力，卷揚起壓力、卷揚落壓力進行時仿真和實驗的驗證，實驗結(jié)果與仿真結(jié)果吻合，驗證了仿真模型及相關(guān)理論的正確性。 (5)基于卷揚液壓系統(tǒng)HCD模型，分別對閥芯彈簧、控制活塞面積、閥芯節(jié)流口面積增益以及閥芯彈簧的預(yù)壓縮力和卷揚液壓系統(tǒng)穩(wěn)定性之間的關(guān)系進行了研究。
[Abstract]:Hydraulic balancing valve is a hydraulic balancing circuit, which can produce a certain back pressure, which is used to balance the weight of the actuator under the condition of exceeding the load, and to prevent the moving parts of the actuator from falling freely because of the influence of gravity. In order to control the descending speed of the actuator and improve the stiffness of hydraulic system, a hydraulic element is a kind of hydraulic component. The hydraulic balance valve is the key element to realize the balance function of the hydraulic balancing circuit. The balance and stability of the system can be realized in the balance loop, and its performance directly affects the stability, reliability and system efficiency of the whole machine. The hoisting hydraulic system is an important subsystem in the hydraulic system of truck crane. Its function is to realize the lifting and lowering of heavy objects. In the process of lowering heavy objects, the load force and the movement direction of load are the same. That is, beyond the load conditions, the system is prone to pressure impact, dynamic performance instability. When the motor variables are closed to keep the lifting weight unchanged. The influence factors of the stability of the winch hydraulic system are mainly concentrated in the balance valve in the winch system. It is of theoretical and practical significance to study the relationship between the structural parameters of the balance valve and the stability of the hoisting hydraulic system. In this paper, the relationship between the structural parameters of the balance valve and the stability of the hoisting system of the truck crane is studied in combination with the school-enterprise cooperation project, "the Transformation of the domestic balance Valve", in order to exceed the load condition. The drop jitter of heavy objects in winch system is studied. Based on AMESim1 (. Advanced Modeling Environment for Simulations ofengineering systems. The software simulation platform establishes the HCD(Hydraulic Component design model of the balancing valve and variable motor, and the hydraulic system which is composed of them. The relationship between the structural parameters of the hoisting hydraulic system and the balance valve is studied by means of transfer function method, dynamic simulation analysis and experimental verification. The main contents of this paper are as follows: The working principle and defects of several common balancing circuits are analyzed respectively, and the development status of balancing valves at home and abroad is compared. The working principle of oil control balancing valve is introduced, and the mathematical model of single stage balance valve is established based on transfer function method. The HCD models of balance valve and variable motor are established by using the method of component level modeling. The parameters are set up according to the inherent characteristics of the component itself. The correctness of HCD model is verified. On the basis of correct model, the hoisting hydraulic system model is built. The test scheme of dynamic performance of winch hydraulic system is designed, and the prototype experiment is carried out. The main process of load drop is zero load and 10 t load, the pressure of motor load port, and the roll up pressure. The simulation results are in good agreement with the simulation results, which verify the correctness of the simulation model and related theories. Based on the HCD model of the winch hydraulic system, the piston area is controlled for the spool spring. The relationship between the area gain of valve core throttle, the precompression force of spool spring and the stability of winch hydraulic system is studied.
【學(xué)位授予單位】：吉林大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TH137.5

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