附件24.5 (5)What do the hydraulic control valves have in common and what are the basic requirements of them. Referenced answers:Refer to the answers on the pages from 131 to 132 in your textbook. 4.Computations (1)In the circuit of variable displacement pump-fixed displacement motor,rotating speed n=1500 r/min and displacement v mlr of variable displacement pump and displacement v10 mr of fixed displacement motor have been known.The adjusted pressure of relief valve.It is assumed that the volume efficieny and mechanical efficieney of both pump and motor are 95.1).what is the displacement of pump when the motor rotating speed is =1000 r/min.2)What is the maximum output power of pump. Referenced answers:1)7.3869(ml/r);2)760(W) (2)As shown in the figure,A=50 cm,A2=20 cm,they are effective area of hydrauli cylinders respectively.Flow rate of pump is q=6W/min,the load is F=6000N,F2=4000N. What is the working pressure pl,p2 of the two hydraulie cylinders and the movement velocityvv2 of two piston when loss is neglected? 2 Referenced answers:P:-3.2MPa;p:-2MPa;v.02m;v0.05m/ 5.Reasoning The motion(quick feeding->working Feeding-quick retracting-to reset)can be achieved 附件 24.5 (5) What do the hydraulic control valves have in common and what are the basic requirements of them. Referenced answers: Refer to the answers on the pages from 131 to 132 in your textbook. 4. Computations (1) In the circuit of variable displacement pump-fixed displacement motor，rotating speed =1500 r/min and displacement =8 ml/r of variable displacement pump and displacement =10 ml/r of fixed displacement motor have been known . The adjusted pressure of relief valve is p n max v mv y p =40×105 Pa . It is assumed that the volume efficiency and mechanical efficiency of both pump and motor are 0.95. 1). what is the displacement of pump when the motor rotating speed is =1000 r/min. 2) What is the maximum output power of pump. mn Referenced answers: 1) 7.3869 (ml/r); 2) 760 (W) (2) As shown in the figure , A1=50 cm2 ，A2=20 cm2 ，they are effective area of hydraulic cylinders respectively. Flow rate of pump is q=6l/min, the load is F1=6000N, F2=4000N. What is the working pressure p1, p2 of the two hydraulic cylinders and the movement velocity v1、v2 of two piston when loss is neglected？ Referenced answers: p1 =3.2MPa; p2 =2MPa; v1=0.02m/s; v2=0.05m/s. 5.Reasoning The motion (quick feeding→working Feeding →quick retracting→to reset) can be achieved 4