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Research on the performance of electro-hydraulic proportional flow valve controlled by pilot pump

机译:先导泵控制电液比例流量阀性能研究

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Cartridge flow valves, widely applied in heavy machine and equipment, have the advantages of low leakage, large flow capacity, and simple structure. However, in the existence technologies, in order to reduce the influence of load variety on valve flow, a pressure differential compensator or a cartridge type flow sensor should be added to proportional throttle valve. This method reduces valve flow capacity and increases system throttling loss. In large flow occasion, flow only can be indirectly controlled by changing valve opening area for the limitation of the structure. So a low energy consumption, high controllable electro-hydraulic proportional valve which is structured by a hydraulic transistor (Valvistor) and a small displacement hydraulic pump driven by a servo motor is introduced. Based on the Valvistor valve flow amplification principle, main valve flow is controlled by pilot pump flow which is controlled by changing rotation speed without the influence of load variety. In the research, it's known from the analysis of the new principle valve steady flow characteristics that feedback throttle slot pre-opening will cause the decrease of the main valve flow as pressure drop increases. Soa method of pressure differential-pilot pump rotation speed compensation is put forward and it can obtain ideal flow characteristic. Then the dynamic mathematical model is established and the main valve stability criterion is derived. The influence of the valve parameters on main valve performance is analyzed and simulated. The results provide a new method for the large flow electro-hydraulic proportional control system.
机译:插装式流量阀广泛应用于重型机械和设备,具有泄漏少,流量大,结构简单的优点。然而,在现有技术中,为了减小负载变化对阀流量的影响,应在比例节流阀上增加压力差补偿器或盒式流量传感器。这种方法降低了阀门的流量,并增加了系统节流损失。在大流量场合,只能通过改变阀的开度来间接控制流量,以限制结构。因此,介绍了一种由液压晶体管(Valvistor)和由伺服电动机驱动的小排量液压泵构成的低能耗,高可控电动液压比例阀。基于Valvistor阀流量放大原理,主阀流量由先导泵流量控制,先导泵流量通过改变转速来控制,而不受负载变化的影响。在研究中,从对新的主阀稳流特性的分析中可以知道,反馈节气门缝的预开度将导致主阀流量随压降的增加而减少。提出了压差先导泵转速补偿的Soa方法,可获得理想的流量特性。然后建立了动态​​数学模型,并推导了主阀的稳定性判据。分析并模拟了阀参数对主阀性能的影响。研究结果为大流量电液比例控制系统提供了一种新的方法。

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