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工程机械作业装置,除了需要正反两个方向的动作及静止状态外,有时还需要有浮动位置。例如推土机清理地面时,需要铲刀自由运动,以便随地面起伏而稍有升降,装载机装料时,为使铲斗紧贴地面而又不入地,也需要动臂呈自由状态。为此许多工程机械作业装置可用一个手动带定位销的四位换向阀来实现上述状态(图1中阀A的方框1即能得到浮动回路)。为了能用液压或电信号来遥控,可以用图2左的三
Construction machinery operating device, in addition to the positive and negative direction of the need for action and static state, and sometimes also need to have a floating position. For example, bulldozers cleaning the ground, the blade needs free movement in order to fluctuate with the ground and a slight lift, loader loading, in order to make the bucket close to the ground without access, but also need to boom was free. To do this, many construction machinery workstations can achieve this by using a four-way selector valve with a manual dowel pin (block 1 of valve A in Figure 1, which results in a floating loop). To be able to use hydraulic or electrical signals to remote control, you can use the left three of Figure 2