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一、油路中存在的问题我厂有两台立式镗床,主轴箱上下运动是液压驱动,如图1所示。该系统采用定量泵1和变量泵2,前者作供油用,后者作回油调速用.手动五位控制阀4用来实现主轴箱的工作进给,即上下快速移动、上下进给及停止。主轴箱快速移动时,油缸3的回油经背压阀5流回油箱.主轴箱工作进给移动时,油缸3的回油经变量泵2流回油箱。调节变量泵2,主轴箱可获得不同的进给速度。主轴箱向下快速移动速度为 v_快=440mm/min,而工作进给速度为移 v_工=2.4mm/min,两速度之比高
First, the existing problems in the oil plant I have two vertical boring machine, headstock up and down movement is hydraulic drive, shown in Figure 1. The system uses quantitative pump 1 and variable pump 2, the former for oil, the latter for oil return speed with the manual five-position control valve 4 is used to achieve the work of the spindle box feed, that is, up and down fast-moving, up and down feed And stop. When the headstock moves rapidly, the oil return from the cylinder 3 flows back to the tank through the back pressure valve 5. The oil return from the oil cylinder 3 flows back to the tank through the variable displacement pump 2 when the headstock working feed is moved. Adjust the variable pump 2, the spindle box can get different feed rates. Spindle box down fast moving speed v_ fast = 440mm / min, and the work of the feed speed for the shift v_ 工 = 2.4mm / min, the ratio of the two high