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为使油缸在上端或处于行程中间位置时与自重等达到平衡而停止动作,可使用背压阀,不过这种平衡回路存在以下缺点。首先由于各个背压阀的特性不同,要使几个油缸同步动作是困难的。另外,如果油缸和背压阀之间的液压元件因破损等而漏油,油缸就会快速动怍,产生危险。为了解决上述问题,设计了如图2那样的液压回路装置。当油缸上升时,液压油由四通阀的 A 口通过背压阀、先导式二通阀流入油缸下侧油腔。这时,油缸上侧油腔的液压油,经油路2,通过四通换向阀的 B 口、R 口回到油箱。油缸的
To make the cylinder at the top or in the middle of the stroke and weight balance to stop action, you can use the back pressure valve, but this balance circuit has the following disadvantages. First of all, due to the different characteristics of the back pressure valve, to make several cylinders synchronized action is difficult. In addition, if the hydraulic components between the cylinder and the back pressure valve leak oil due to damage, etc., the cylinder will move rapidly and cause danger. In order to solve the above problems, designed as in Figure 2 that the hydraulic circuit device. When the cylinder rises, the hydraulic oil flows from the A port of the four-way valve through the back pressure valve and the pilot two-way valve into the lower oil chamber of the cylinder. At this moment, the hydraulic oil in the oil chamber on the upper side of the cylinder will return to the oil tank through the B port and the R port of the four-way reversing valve via the oil passage 2. Cylinder