Chapter 9 Design of Hydraulic Transmission systems Tab.9-1 Working pressure selected for an actuator according to load Load <5000 5000~ 10000- 20000~ 30000~ >50000 F N) 10000 20000 30000 50000 Working pressure p <0.8~1 1.5-2 2.5~3 3~4 4~5 5~7 (MPa) Tab.9-2 Working pressure selection for an actuator according to mainframe type Machine tools Agricultural Hydraulic press, Mainframe Grin- Modular Planer Drawing machinery,small- large-sized excavator, type der machine sized engineering heavy machinery, bench tools machinery,auxiliary lifting and conveying devices for machinery engineering machinery Working 2 35 ≤8 8~10 1016 20-32 pressure p (MPa) 11 Homepage List Upwards Downwards Retumn Exit
Chapter 9 Design of Hydraulic Transmission systems 11 Tab.9-1 Working pressure selected for an actuator according to load Load F（N） <5000 5000~ 10000 10000~ 20000 20000~ 30000 30000~ 50000 >50000 Working pressure p （MPa） <0.8~1 1.5~2 2.5~3 3~4 4~5 5~7 Tab.9-2 Working pressure selection for an actuator according to mainframe type Mainframe type Machine tools Agricultural machinery, smallsized engineering machinery, auxiliary devices for engineering machinery Hydraulic press, large-sized excavator, heavy machinery, lifting and conveying machinery Grinder Modular machine tools Planer Drawing bench Working pressure p（MPa） ≤2 3~5 ≤8 8~10 10~16 20~32
Chapter 9 Design of Hydraulic Transmission systems 3.Drawing of working condition chart of the actuators After the structure parameters of the actuators are determined,the practical working pressure,the flow rate and the power can be calculated according to the design task and its requirements.Then pressure(flow rate,or power)- time(or displacement)curves can be drawn out,as shown in Fig9-3. P.q,Pk 1-Startup acceleration 2-Quick feed 3-Working feed 4-Brake 47 Fig.9-3 Working condition chart of actuators 12 Homepage List Upwards Dowrwards Retumn Exit
Chapter 9 Design of Hydraulic Transmission systems 12 3. Drawing of working condition chart of the actuators After the structure parameters of the actuators are determined, the practical working pressure, the flow rate and the power can be calculated according to the design task and its requirements. Then pressure (flow rate, or power)— time (or displacement) curves can be drawn out, as shown in Fig.9-3. Fig.9-3 Working condition chart of actuators 1-Startup acceleration 2- Quick feed 3- Working feed 4- Brake
Chapter 9 Design of Hydraulic Transmission systems 9.1.3 Determination of hydraulic system diagram 1.Analysis and selection of the hydraulic scheme 2.Analysis and selection of the hydraulic circuits 3.Determination of hydraulic system diagram 13 Homepage List Upwards Downwards Retumn Exit
Chapter 9 Design of Hydraulic Transmission systems 13 9.1.3 Determination of hydraulic system diagram 1.Analysis and selection of the hydraulic scheme 2. Analysis and selection of the hydraulic circuits 3. Determination of hydraulic system diagram