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一、提升机泵控内曲线液压马达系统图1所示,当变量泵向A管道供油时,其压出的油液分三支进行工作。第一路经一控制油路顶开液压制动器,为三个液压马达回转作好准备;另一路经另一控制油路使B管道上的液控单向阀打开,为三个液压马达排回的油液回到变量泵吸油口作好准备;第三路经平衡阀中的单向阀进入三个液压马达上油口,此时三个液压马达同步回转提升负载。当变量泵调节方向改变,在改变的过渡过程中,在系统的不灵敏区内,系统压力下降到零值,液压制动器制动,负载轴停止回转。当调节方向改变的过渡过程完成以后,变量泵向B管道供油,其压出的油液也分三支进行工作,此时三液压马达同步回转下放负载。将变量泵调节到零位,起
First, the hoist pump control curve hydraulic motor system shown in Figure 1, when the variable pump to the A pipeline oil, the pressure of the oil out of three work. The first road through a hydraulic control hydraulic top hydraulic brake for the three hydraulic motor to prepare for the revolution; the other way through another control oil pipeline B pilot check valve opens for the row of three hydraulic motor Of the oil back to the variable pump suction port ready; the third way through the balance valve in the one-way valve into the three hydraulic motor on the port, this time three hydraulic motor synchronous lifting lift load. When the variable pump adjusts the direction of change, in the transition process of change, in the system insensitive zone, the system pressure drops to zero, the hydraulic brake brakes, the load shaft stops rotating. When the adjustment of the direction of change in the transition process is completed, the variable pump oil supply to the B pipe, the pressure of the oil is also divided into three work, at this time the three hydraulic motor swing synchronous decentralized load. Adjust the variable pump to zero and start