1 / 78

HYDRAULIC CIRCUITS

Welcome to the Session on :. HYDRAULIC CIRCUITS. HYDRAULIC CIRCUITS. MOTOR & PUMP. PRESSURE CONTROL VALVES. HYDRAULIC POWER UNIT. FLOW CONTROL VALVES. ACTUATORS. DIRECTION CONTROL VALVES. ACCESSORIES. HYDRAULIC CIRCUITS. A GOOD HYDRAULIC SYSTEM REQUIREMENT -.

iburns
Download Presentation

HYDRAULIC CIRCUITS

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Welcome to the Session on : HYDRAULIC CIRCUITS

  2. HYDRAULIC CIRCUITS MOTOR & PUMP PRESSURE CONTROL VALVES HYDRAULIC POWER UNIT FLOW CONTROL VALVES ACTUATORS DIRECTION CONTROL VALVES ACCESSORIES

  3. HYDRAULIC CIRCUITS A GOOD HYDRAULIC SYSTEM REQUIREMENT - • SATISFY THE SPECIFICATIONS OF THE OPERATION WITH • SAFETY • PERFORM SMOOTH OPERATION • LOW ENERGY CONSUMPTION – LOW HEAT GENERATION • REDUCE INITIAL COST & RUNNING COST • MAKE MAINTENANCE EASY HYDRAULIC CIRCUITS ARE GRAPHICAL DIAGRAMS OF THE HYDRAULIC SYSTEMS. IT ALSO INDICATES EACH OPERATION OF THE COMPONENTS.

  4. M HYDRAULIC CIRCUITS SPEED CONTROL CIRCUIT Variable displacement pump circuit

  5. M HYDRAULIC CIRCUITS SPEED CONTROL CIRCUIT Meter – in Circuit

  6. M HYDRAULIC CIRCUITS SPEED CONTROL CIRCUIT Meter – out Circuit

  7. M HYDRAULIC CIRCUITS SPEED CONTROL CIRCUIT Bleed – off Circuit

  8. M HYDRAULIC CIRCUITS SPEED CONTROL CIRCUIT Deceleration Circuit

  9. M HYDRAULIC CIRCUITS SPEED CONTROL CIRCUIT Feed speed varying circuit

  10. HYDRAULIC CIRCUITS SPEED CONTROL CIRCUIT Multi Speed Circuit Q1 : High Flow Q2 : Low Flow Q1 Q2 M

  11. M HYDRAULIC CIRCUITS SPEED CONTROL CIRCUIT Multi Speed Circuit 1 : Rapid Advance 2 : Medium Advance 3 : Slow Advance 1 UCF2-04 3 2

  12. HYDRAULIC CIRCUITS SPEED CONTROL CIRCUIT Multi Speed Circuit Sol. 1 ON Low speed forward Sol. 3 ON High speed forward Sol. 3 OFF Speed decrease Sol. 1 OFF Stop. Sol. 2 ON Low speed reverse Sol. 4 ON High speed reverse Sol. 4 OFF Speed decrease Sol. 2 OFF Stop. Sol. 1 Sol. 2 Sol. 3 Sol. 4 M

  13. HYDRAULIC CIRCUITS PRESSURE CONTROL CIRCUIT 2 Operating Pressure Circuit 1 2

  14. HYDRAULIC CIRCUITS PRESSURE CONTROL CIRCUIT Low Pressure Return Circuit 2 Pilot Relief Valve Main Relief Valve 1

  15. M HYDRAULIC CIRCUITS PRESSURE CONTROL CIRCUIT Decompression Circuit

  16. M HYDRAULIC CIRCUITS UNLOADING CIRCUIT Manual Unloading To Circuit

  17. HYDRAULIC CIRCUITS UNLOADING CIRCUIT Circuit using Accumulator Detection of Pressure by Pressure Switch

  18. M HYDRAULIC CIRCUITS UNLOADING CIRCUIT Circuit using Accumulator Detection of Pressure by Pilot Op. Relief Valve

  19. HYDRAULIC CIRCUITS UNLOADING CIRCUIT ( Hi-Low Circuit ) Low Pressure Operation

  20. HYDRAULIC CIRCUITS UNLOADING CIRCUIT ( Hi-Low Circuit ) High Pressure Operation

  21. M HYDRAULIC CIRCUITS SYNCHRONIZING CIRCUIT Series coupling circuit

  22. M HYDRAULIC CIRCUITS SYNCHRONIZING CIRCUIT Mechanical Coupling

  23. HYDRAULIC CIRCUITS REGENERATIVE CIRCUIT - I Idle Condition

  24. HYDRAULIC CIRCUITS REGENERATIVE CIRCUIT - I Regenerative Advance

  25. HYDRAULIC CIRCUITS REGENERATIVE CIRCUIT - I Retraction

  26. 1 2 Cylinder 1 Cylinder 2 3 4 LS-1 LS-2 LS-3 a b c d M HYDRAULIC CIRCUITS SEQUENCE CIRCUITS Electrically controlled circuit

  27. M HYDRAULIC CIRCUITS SEQUENCE CIRCUITS Automatic control circuit Small Load Large Load

  28. HYDRAULIC CIRCUITS CLAMPING & SEQUENCING CIRCUIT Extending Clamp Cylinder

  29. HYDRAULIC CIRCUITS CLAMPING & SEQUENCING CIRCUIT Extending Work Cylinder

  30. HYDRAULIC CIRCUITS CLAMPING & SEQUENCING CIRCUIT Limiting Max. Clamping Pr.

  31. HYDRAULIC CIRCUITS CLAMPING & SEQUENCING CIRCUIT Retracting Work Cylinder

  32. HYDRAULIC CIRCUITS CLAMPING & SEQUENCING CIRCUIT Retracting Clamp Cylinder

  33. HYDRAULIC CIRCUITS ACCUMULATOR UNLOADING CIRCUIT Charging

  34. HYDRAULIC CIRCUITS ACCUMULATOR UNLOADING CIRCUIT Unloading

  35. HYDRAULIC CIRCUITS ACCUMULATOR UNLOADING CIRCUIT Supply from Accumulator

  36. M HYDRAULIC CIRCUITS ACCUMULATOR CIRCUITS Power saving circuit Starter motor Starting circuit for a diesel engine.

  37. M HYDRAULIC CIRCUITS ACCUMULATOR CIRCUITS Pressure holding ( leakage compensation ) Vice

  38. M HYDRAULIC CIRCUITS ACCUMULATOR CIRCUITS Safety Device Safety device in a Rolling Mill

  39. M HYDRAULIC CIRCUITS ACCUMULATOR CIRCUITS Surge pressure reducing circuit

  40. M HYDRAULIC CIRCUITS ACCUMULATOR CIRCUITS Pump capacity reducing circuit Low Pressure Pump High Pressure Pump

  41. HYDRAULIC CIRCUITS COLLECTION OF DATA FOR CIRCUIT DESIGN • CYLINDER DETAILS • SINGLE ACTING OR DOUBLE ACTING ? • HOW MANY CYLINDERS ? • SEQUENCE OF CYLINDER MOVEMENT ( ONE AFTER OTHER OR ALMOST TOGETHER ) • FUNCTION OF THE CYLINDER ( Eg., Clamping, Drilling ) • MACHINE TO WHICH THESE CYLINDERS GO ( Eg., Grinding M/c. ) • BORE SIZE & ROD SIZE OF THE CYLINDER • STROKE LENGTH OF THE CYLINDER • MANUAL OR SOLENOID OPERATED MOVEMENT ? • FORCE ACTING ON THE CYLINDER • SPEED OF MOVEMENT REQUIRED • SINGLE SPEED / DOUBLE SPEED / MULTI SPEED ? • LOAD REQUIREMENTS

  42. HYDRAULIC CIRCUITS COLLECTION OF DATA FOR CIRCUIT DESIGN • OTHER DETAILS • LOCATION OF SYSTEM / EQUIPMENT / ACTUATOR ( Eg. Distance between Power Unit to the Actuator ) • LIMITATIONS OF OPERATION ( Eg. Medium, Environment, Space ) • AVAILABILITY OF POWER SOURCE & DETAILS ( Eg. AC / DC ) • TYPE OF COOLING REQUIRED • SAFETY MEASURES NEEDED

  43. HYDRAULIC CYLINDERS ( LINEAR ACTUATORS ) HYDRAULIC MOTORS ( ROTARY ACTUATORS ) HYDRAULIC CIRCUITS UNDERSTANDING HYDRAULIC CIRCUITS & HYDRAULIC POWER PACKS BEGIN WITH THE END ACTUATORS

  44. HYDRAULIC CIRCUITS • A good hydraulic circuit design can be made only when the parameters influencing the feed drive are clearly understood. • TYPES OF SLIDE • VERTICAL • HORIZONTAL • INCLINED • TYPES OF MACHINING • ROUGH MACHINING • FINE MACHINING

  45. HYDRAULIC CIRCUITS NORMAL WORKING PRESSURES FOR VARIOUS SYSTEMS

  46.  d  D HYDRAULIC CYLINDERS SELECTION OF AN ACTUATOR F1 AREA A2 AREA A1 F2 PRESSURE = OUTPUT FORCE EFFECTIVE PISTON AREA P = F Kg A Cm2

  47. P = F A A = F P = 4000 Kg = 80 Cm2 50 Kg / Cm2 HYDRAULIC CIRCUITS SELECTION OF AN ACTUATOR Eg. : Pressure = 50 Kg / Cm2 Force required = 4000 Kgs. ( 4 Ton ) Or A =  x D2 4 ( In this Example A = 80 Cm2 ) 80 =  x D2 4 D = 100 mm Use  100 mm Bore Cylinder

  48. HYDRAULIC CIRCUITS SELECTION OF AN ACTUATOR TO CALCULATE THE FLOW “ Q” Q = A x V Q = Flow in Cm3 / min. ( Divide by 1000 to get flow in LPM ) A = Area in Cm2 V = Velocity in Cm / min

  49. HYDRAULIC CIRCUITS TO CALCULATE THE MOTOR POWER MOTOR POWER (KW) = P x Q 612 x O P = Pressure in Kg / Cm2 Q = Flow in LPM O = Pumps Overall Efficiency ( Eg. 85 %  0.85 )

  50. H1 = Li x ( 100 - O ) x 860 100 HYDRAULIC CIRCUITS Heat Generation in a Hydraulic System SOURCE : Oil Pump Oil pumps exhaust a large portion of its shaft-input power to perform an effective task ( Pump output pressure, pump output flow ), while the rest turns into heat without doing any work. H1 = Heat generated from the Pump ( Kcal / Hr ) Li = Pump input power ( KW ) O = Pump overall efficiency ( % )

More Related