10/9/2015sme3252: mechatronics lecture 4 1 pneumatic and hydraulic actuation systems lecture 4
TRANSCRIPT
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Pneumatic and hydraulic actuation systems
Lecture 4
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7.1: Actuation system• Transform output of control system (i.e.
µprocessor) into action (controlling) on device / machine
• Examples are:• Electrical output from controller to a
linear motion to move a load• Electrical output from controller to control
amount of liquid passing through a pipe
Controller Actuatorinput
Electrical signal
output
motion
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Types
• Pneumatic and hydraulic actuator (Chapter 7)
• Mechanical actuator (Chapter 8)
• Electrical actuator (Chapter 9)
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7.2: Pneumatic and hydraulic systems
• Pneumatic signals – to control final control elements
• The electrical signal – actuate large valve and high power control devices
• Drawbacks – compressibility of air• Hydraulic signals – higher power
control devices• Drawbacks – expensive, hazards due
to oil leaks
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PSI (lb/in2)
Pounds per Square Inch
•determines amount of force
GPM
Gallons per Minute
•determines speed of action
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PRESSURE = FORCE/AREA
Find Pressure, F2:
F2 =
F1 = 20 lbf
A1 = 2 in2
A1 = 20 in2
Pressure = 10 psi
200 lbf
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7.2.1: Hydraulic Actuator
• Tool or equipment powered by the movement of fluid under pressure.
• Pressurized hydraulic oil - sump• Heavy duty - brakes, jacks & tractor
lifts.
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Hydraulic Power Supply
Motor
Pump
Pressure relief valveNon-
return valve
Accumulator
Oil
Sump
Return
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Figure 7.1 (a) Hydraulic power supply, (b) accumulator
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Parts of a Hydraulic System
• Pump - pressurize and move fluid from one part of the system to another
• Valves• Ball• Check• Solenoid / power transfer• Relief
• Filters– Remove impurities in oil
• Heat exchangers– Remove heat created by high pressure and
moving parts
• Accumulators
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Hydraulic Pump
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Hydraulic pumps are usually one of four types:
a. PISTONb. GEARc. VANEd. INTERNAL ROTOR
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a. Piston Pumps• Work well at PSI’s of 2000 or more• Single piston pump used in bottle
jacks• Require several pistons working
together to generate enough volume for tractor applications
• Necessarily involve many moving parts
• Refer to Figure 7.2c for radial piston pump and 7.2d for axial piston pump
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b. Gear Pumps•Work well at 1500 PSI and
below•Work with a minimum of
moving parts•Less expensive to
manufacture than piston type pumps
•Disadv. – leakage occurs
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Gear Pump driven gear
idler gear
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c. Vane Pump
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ACCUMULATORS
• Dampens hydraulic shock
• Supply of pressure if pump fails
• Maintain pressure without continuous pump operation
• Demand changes
• Make-up• Three types
– Piston– Bladder– Direct contact
-
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Figure 7.2 (a) Gear pump, (b) vane pump, (c) radial piston pump, (d) axial piston pump with swash plate
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Application
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HYDRAULIC SYSTEMS
• ADVANTAGES– Long distances– Great flexibility
(any shape or form)– Variable speed
control– Reliability
• DISADVANTAGES– Need for positive
confinement– Oil is flammable– High pressure
(typically 3000 psi)– Need for filtration
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Pneumatic Actuator
• Compressed air• Light duty
Compressor
Air receiver
Air regulator
Air
6 – 8 bar
Store compressed air
Set pressure
Piston,
Valve,
switching
motion
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Pneumatics – Basic Principles
o Pneumatics – The study of the mechanical properties of air and other gasses.
o A gas under pressure has the ability to exert a force
Pascal’s Law states that a compressed gas will exert pressure equally in all directions
A pressure acting over an area will result in a net force being applied
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Pneumatics – Basic Principles
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Pneumatic Power Supply
MotorCompressor
Silencer
Filter
Pressure relief valve Cooler
Filter and water trap
-dry and dust free
Air receiver
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Figure 7.3 Pneumatic power supply
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Compressor
• To compress air• Three types:
– Piston– Screw– Diaphragm
• Air receiver to store compressed air• Regulator to regulate the pressure• Automatic power cut-off above set
pressure• Pressure relief valve
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Compressor
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Figure 7.4 (a) Single-acting, single stage, vertical, reciprocating compressor,(b) rotary vane compressor, (c) screw compressor
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Pneumatic Circuit
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Application – Robotic System
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Exercises
• Power supply components for hydraulic system and pneumatic system – explain with diagram and identify difference
• Examples of application for both system
• Advantages and disadvantages of each system
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End of Lecture 4