附件24.3 (1)Before clamping a work piece,the clamping cylinder would move without load,and then what are the pressures of pointsA.B.andC? ()After elampinga work piece,the outlet pressure of the pump is5MPa,what are the pressures of points A and C? (3)After clamping a work piece.the outlet pressure would reduce to 1.5MPa due to other actuators'quick feed actions,what are the pressures of points A and C? h9 Problem 7-3 7-4 A hydraulic system is shown in the figure,the total weight of the vertical hydraulic piston and the ing pressures of pump and pump2 are pand parespectively.If the pressure in the pipelines were assumed lossless (1)What types of valve do valves45,9 belong to?And what are their functions in the system? (2)How to adjust the pressure of valves 4.6,9? ()Which basic circuits does this system consist of? Problem 7-4 7-5 Deduce the expressions of speed-load characteristic,speed stiffness and efficiency of a speed regulation circuit n th ote valve-used oi retur path. The other known conditions are shown in the figure 附件 24.3 (1) Before clamping a work piece, the clamping cylinder would move without load, and then what are the pressures of points A, B, and C? (2)After clamping a work piece, the outlet pressure of the pump is 5MPa, what are the pressures of points A and C? (3)After clamping a work piece, the outlet pressure would reduce to 1.5MPa due to other actuators’ quick feed actions, what are the pressures of points A and C? Problem 7-3 7-4 A hydraulic system is shown in the figure, the total weight of the vertical hydraulic piston and the moving parts is G; the areas of the two chambers are A1 and A2 respectively, and the largest working pressures of pump 1 and pump 2 are p1 and p2 respectively. If the pressure in the pipelines were assumed lossless, (1) What types of valve do valves 4,5,6,9 belong to? And what are their functions in the system? (2) How to adjust the pressure of valves 4,5,6,9? (3) Which basic circuits does this system consist of? Problem 7-4 7-5 Deduce the expressions of speed-load characteristic, speed stiffness and efficiency of a speed regulation circuit in throttle valve-used oil return path. The other known conditions are shown in the figure