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图示系统,液压缸的有效面积 ,缸1负载 ,缸2运动时负载为零,不计摩擦阻力、惯性力和管路损失,溢流阀、顺序阀和减压阀的调定压力分别为4MPa, 3MPa和2MPa,求下列三种情况下A、B、C处的压力。 1)泵起动后,两换向阀处于中位; 2)1YA通电,缸1运动时和到终端停止时; 3)1YA断电,2YA通电,缸2运动时和碰到固定挡块停止运动时。
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