Research on Independent Metering Leveling Control System of Large Hydraulic Press
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摘要: 针对传统大型液压机的调平控制系统在四角调平的过程中，无法实现两对角液压缸输出力的独立控制，结合负载口独立控制技术，设计了基于负载口独立控制的大型液压机调平控制系统，并对其控制特性、液压缸的输出力特性进行了理论分析，利用AMESim建立了大型液压机负载口独立调平控制系统仿真模型，在优化PID调节参数后，进行了系统仿真。仿真结果表明：通过闭环调节四个二位二通比例阀的开口度大小，以及进、出口阀口开口度的比例关系，不仅可以实现活动横梁的自动调平控制，而且能够实现两对角液压缸输出力的独立控制，从而提高了控制系统的准确性和稳定性。Abstract: As in the process of four corner leveling control in the traditional large hydraulic press leveling control system, the independent control of output force of two diagonal hydraulic cylinders is unable to achieve. Combining with the independent metering control technology, the large hydraulic press leveling control system based on the independent metering control is designed, and the control characteristics and output force characteristics of hydraulic cylinders is analyzed. Using computer simulation software AMESim, the simulation model for the large hydraulic pressure leveling control system was established. The simulation results show that by adjusting the opening degree of four 2/2-way proportional valves by closed loop and the ratio between inlet and outlet valve opening degrees, the automatic leveling control of the movable beam is realized, and also the independent control of the output force of the two diagonal hydraulic cylinders can be realized, as a result that the accuracy and stability of the control system are improved.
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表 1 主要元件的设定参数
名称 主要设定参数 电机 转速:1 000 r/min 泵 排量:230 mL/r, 机械效率:95% 二位二通比例阀 最大流量120L/min, 固有频率25Hz, 阻尼比0.707 三位四通换向阀 最大流量250L/min, 固有频率20Hz, 阻尼比0.707 调平缸 活塞直径876mm, 活塞杆直径613mm, 行程1500mm 溢流阀 最大流量:300 L/min 
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