国产ZL30型轮式装载机液压系统油路如附图所示,在该系统中,阀1充当整个系统的安全阀,阀2和阀3的功能是过载溢流和补油。装载机只在翻斗机构倾翻或处于某个区域时才需要阀2实现上述两种功能。翻斗机构作倾翻动作时,受斗内载荷和倾翻动作的惯性作用,有可能使活塞杆受非液压力的作用而出现快速移动,从而使有杆腔内出现吸空现象。此时希望阀2的补油功能发挥作用,以避免吸空。 Domestic ZL30 wheel loader hydraulic system circuit shown in the figure, in the system, the valve 1 acts as a safety valve for the entire system, valve 2 and valve 3 is the function of overload overflow and charge. The loader needs Valve 2 to achieve both of these functions only when the tipper mechanism is tipping over or in a certain area. When the tipping mechanism is tipping over, the inertial action of the load and tipping action in the bucket may cause the piston rod to move rapidly due to the non-hydraulic pressure, so as to make the rod cavity absorb the air. At this time, it is desirable that the charging function of the valve 2 function to prevent air suction.