附件24.3 discharge volume of the accumulator?(The working state of the accumulator can be viewed as an isothermal process 5L/min.The accumulator exhausts the oil to the system quickly when the pressure rises to 20MPa.The discharge volume is 5L when the pressure drops to 10MPa.What is the volume of the accumulator? 6-3 Why don't we install a pure filter in the inlet port of the hydraulic pump? 6-4 Ina hydraulic system,the working pressure is 7MPa,and the flow rate is60L/min. (1)What is the pressure of the feed pipe (2)How to select the oil pipe material and the wall depth? Chapter 7 7-1Try to make a four stages pressure-reulating and unlading and describing briefly its working valves with two-way 7-2 As is shown in the figure,the effective working areas of the hydraulic cylinders A=A2 =100 cm,A2=42 =50 cm.The working loads of two cylinders:F =35000 N. F25000N,the setting pressures of the relief valve,sequence valve and pressure-reducing valve are 5MPa 4MPa and 3MPa respectively.If friction resistance,inertial force.the pressure loss in pipelines and directional control valve are neglected,what are the pressures ppp under the working conditions of A.B.C? BSolenoid 2Y is actuated and cylinder ll reaches the end stop when moves forwards at working feed speed. C Solenoid 2Y is released and 1Y is actuated,cylinder I loses load suddenly when reaching the end. A12 22 End stop (死挡板》 3MPa Problem 7-2 7-3 For a clumping circuit,if the setting pressures of the relief valve and the pressure-reducing valve are 5MPa and 2.5MPa respectively,analyze:附件 24.3 discharge volume of the accumulator? (The working state of the accumulator can be viewed as an isothermal process.) 6-2 The pressure of filled air in an accumulator is 9MPa, and oil is provided by a pump at a flow rate of 5L/min. The accumulator exhausts the oil to the system quickly when the pressure rises to 20MPa. The discharge volume is 5L when the pressure drops to 10MPa. What is the volume of the accumulator? 6-3 Why don’t we install a pure filter in the inlet port of the hydraulic pump? 6-4 In a hydraulic system, the working pressure is 7MPa, and the flow rate is 60L/min. (1) What is the pressure of the feed pipe? (2)How to select the oil pipe material and the wall depth? Chapter 7 7-1 Try to make a four stages pressure-regulating and unloading circuit and describing briefly its working principle, using a pilot operated relief valve, two distant pressure regulation valves and two solenoid slide valves with two-way. 7-2 As is shown in the figure, the effective working areas of the hydraulic cylinders 11 AA 21 == 100 cm 2， 12 AA 22 == 50 cm 2 . The working loads of two cylinders: N, N, the setting pressures of the relief valve, sequence valve and pressure-reducing valve are 5MPa、4MPa and 3MPa respectively. If friction resistance, inertial force, the pressure loss in pipelines and directional control valve are neglected, what are the pressures under the working conditions of A, B, C? 35000 FL1 = 25000 FL2 = ppp CBA , A hydraulic pump starts and the two directional control valves are at middle positions. B Solenoid 2Y is actuated and cylinder Ⅱ reaches the end stop when moves forwards at working feed speed. C Solenoid 2Y is released and 1Y is actuated, cylinder Ⅰloses load suddenly when reaching the end. Problem 7-2 7-3 For a clumping circuit, if the setting pressures of the relief valve and the pressure-reducing valve are 5MPa and 2.5MPa respectively, analyze: