Chapter 11 Electro- hydraulics.ppt hidraulicos

Electro- hydraulics

1. ELECTROHYDRAULICS
LESSON
A m p lif ie r
L S 1 L S 2
C o p y rig h t 1 9 9 9 Vick ers In c o rp o ra te dC

2. PLC
Va lve
Am plifier
A ctuator
I Q
OPEN LOOP
POSITION CONTROL
C om m and
Lim it S w itchL S 1 L S 2
C o p y rig ht 1 9 99 Vicke rs In co rp o ra tedC

3. PLC
Va lve
P osition S ensor
Transducer
A m plifier
A ctuator
I Q
CLOSED LOOP
POSITION CONTROL
C om m and
Feedback
C o p yrig h t 1 9 9 9 V ic ke rs In c o rp o ra te dC

4. F
O
R
C
E
WORKING STROKE
WORKING STROKE
EN ER G IZED EN ER G IZEDD E-EN ER G IZED DE-EN ER G IZED
CONVENTIONAL SOLENOID PROPORTIONAL SOLENOID
C o py righ t 1 9 99 V ick ers In c o rp o ra te dC

5. WORKING STROKE
STROKE
PROPORTIONAL SOLENOID
100 %
50 %
25 %
CURRENT
SPRING
CHARACTERISTIC
100% 50% 25%C op yrig ht 19 9 9 Vickers Inco rp ora tedC

6. SOLENOID OPERATION
C opyrig ht 1 99 9 Vickers IncorporatedC

7. SOLENOID OPERATION
C op yrig ht 1 99 9 Vicke rs In corp orate dC

8. INPUT SIGNAL
OUTPUT SIGNAL
RAMPING
RAM P A N G LE
TIM E
TIM E
C op yrig h t 1 9 99 Vicke rs In corporate dC

9. NONFEEDBACK DIRECTIONAL VALVE
FEEDBACK DIRECTIONAL VALVE
Typical
Hysteresis
Typical
Step Responst
< 8 32 ms
< 1 18 ms
FEEDBACK VS. NON-FEEDBACK
C o p y rig h t 1 9 9 9 Vicke rs In c o rp o ra te dC

10. PROPORTIONAL RELIEF VALVE
C o p yrig ht 19 9 9 Vicke rs Inc orpora te dC

11. PROPORTIONAL RELIEF VALVE
C op yrig h t 19 9 9 Vicke rs Inco rp oratedC

12. NON-FEEDBACK
THROTTLE VALVE
FEEDBACK PROPORTIONAL
THROTTLE VALVE
THROTTLE VALVES
Flow Controls
C op yrigh t 1 99 9 Vickers Inc orp orate dC

13. Nonfeedback Directional Valve
Feedback Directional Valve
DIRECTIONAL VALVES
C o pyrig h t 1 99 9 Vicke rs Incorp orate dC

14. DIRECTIONAL VALVES
C op yrigh t 1999 Vickers Inco rp oratedC

15. INTEGRATED ELECTRONICS VALVES
C o p yrig h t 1 9 9 9 V ick e rs In co rp o ra te dC

16. M
H ydraulic
M otor
Pu m p R elief
Va lve
Proportional
Va lve
SCHEMATIC CIRCUIT
C o p yrig h t 1 9 9 9 Vic ke rs In co rp o ra te dC

17. PROPORTIONAL VALVE AMPLIFIER
Amplifier
Card
Low Level
Command Signal
(ma)
Analog Comm and Signal from:
Input Potentiom eter
Joystick
M achine Controller
Valve
Driving Current
(A)
Proportional
ValveC o p y rig h t 1 9 9 9 V ic k e rs In c o rp o ra te dC

18. P ilo t pre s s u re
to th e e n d s
o f m a in s ta g e s p o o l
P ilo t p re s s u re
to th e e n d s
o f m a in s ta g e s p o o l
To rq u e
M o to r
To rq u e
M o to r
1 0 0 0 P S I
5 0 0 P S I5 0 0 P S I
F ix e d
O rific e s
F lap p e r n o zzle
se rvo va lv e
D ire ct a ctin g
se rvo va lv e
Je t pip e
s ervo va lve
A B
P
To rq u e , force
or ste p pe r m o to r
SERVO VALVE TYPES
C o p y r ig h t 1 9 9 9 V ic k e rs In c o rp o r a te dC

19. N N
S S
TORQUE MOTOR
NN
N
S
S
S
C o p y rig h t 1 9 9 9 Vic ke rs In c o rp o ra te dC

20. TORQUE MOTOR AND NOZZLE BLOCK
C op yrig ht 19 9 9 Vickers Incorp ora te dC

21. FLOW
INPUT SIGNAL
LINE TO LINE FIT SPOOL
C o p y rig h t 1 9 9 9 V ic k e rs In c o rp o ra te dC

22. TORQUE MOTOR DE-ENERGIZED
C op yrig ht 19 99 Vicke rs Inco rp ora te dC

23. N N
S
S
S
N
TORQUE MOTOR ENERGIZED
C op yright 1999 Vickers Inc orporatedC

24. N N
S
S
S
N
VALVE SPOOL SHIFTED
C o pyright 199 9 Vickers In co rp ora te dC

25. N N
S S
TP P
A B
JET PIPE SERVO VALVE
C op yrigh t 19 99 Vicke rs Inco rp o ra te dC

26. JET PIPE SERVO
C opy right 19 99 Vicke rs In c orpo ra te dC

27. M
H ydraulic
M o tor
F eedback
Tran sduce r
P um p R elief
Va lve
SCHEMATIC CIRCUIT
S E R V O VA LV E
C o p y rig h t 1 9 9 9 V ic ke rs In c o rp o ra te dC