Chapter 8 Examples of Hydraulic Systems 1.Quick feed 2.Working feed 1 3.Working feed 2 4,End block dwell 5.Quick retract 6.Stop at the start position Homepage List Upwards Downwards Retun Exit
Chapter 8 Examples of Hydraulic Systems 6 1.Quick feed 2. Working feed 1 3. Working feed 2 4. End block dwell 5. Quick retract 6. Stop at the start position
Chapter 8 Examples of Hydraulic Systems Tab.8-1 YT4543 type power-slipway hydraulic system operation eycle Component IYA 2YA 3YA Pressure Distance Operation switch 11 valve 13 Quick feed Actuated (differential-area connection) Working feed 1 + Released Working feed 2 + + Released End block dwell + + Released Quick retract 十 Released →Actuated Stop Actuated Homepage List Upwards Downwards Retumn Exit
Chapter 8 Examples of Hydraulic Systems 7 Component Operation 1YA 2YA 3YA Pressure switch 11 Distance valve 13 Quick feed (differential-area connection) + - - - Actuated Working feed 1 + - - - Released Working feed 2 + - + - Released End block dwell + - + + Released Quick retract - + ± - Released →Actuated Stop - - - - Actuated Tab.8-1 YT4543 type power-slipway hydraulic system operation cycle
Chapter 8 Examples of Hydraulic Systems 8.1.3 Characteristics (1)A volume throttling speed control circuit is composed by a pressure-limiting variable vane pump and a speed adjusting valve. (2)A pressure-limiting variable pump and differential-area connection method are used in this system to accomplish quick feed. (3)Using distance valves and sequence valves for quick- working feeds shift 8 Homepage List Upward止s Downwards Retumn Exit
Chapter 8 Examples of Hydraulic Systems 8 8.1.3 Characteristics (1) A volume throttling speed control circuit is composed by a pressure-limiting variable vane pump and a speed adjusting valve. (2) A pressure-limiting variable pump and differential-area connection method are used in this system to accomplish quick feed. (3) Using distance valves and sequence valves for quickworking feeds shift
Chapter 8 Examples of Hydraulic Systems 8.2 Hydraulic System of Plastic Injection Moulding Machines 8.2.1 Introduction 8.2.2 Operating principle of hydraulic system of SZ- 250A type plastic injection moulding machine 8.2.3 Characteristics Homepage List Upwards Downwards Retun Exit
Chapter 8 Examples of Hydraulic Systems 9 8.2 Hydraulic System of Plastic Injection Moulding Machines 8.2.1 Introduction 8.2.2 Operating principle of hydraulic system of SZ- 250A type plastic injection moulding machine 8.2.3 Characteristics
Chapter 8 Examples of Hydraulic Systems 8.2 Hydraulic System of Plastic Injection Moulding Machines 8.2.1 Introduction The injection moulding processing is shown below: Closing mode chamber-injection seat moving onwards 一→injecting→holding pressure一 cooling ,→injection preplastic seat going back-opening mode chamber-pushing out the product->put cylinder going back ->Closing mode chamber again. 10 Homepage List Upward止s Downwards Retun Exit
Chapter 8 Examples of Hydraulic Systems 10 8.2.1 Introduction The injection moulding processing is shown below: Closing mode chamber → injection seat moving onwards → injecting → holding pressure → →injection seat going back → opening mode chamber → pushing out the product → put cylinder going back →Closing mode chamber again. preplastic cooling 8.2 Hydraulic System of Plastic Injection Moulding Machines