Advantages of Airstroke® actuators

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Actuation &
Failure
Presentation Outline

What is an Airstroke® actuator?

Advantages

Precautions

Airstroke Actuator Selection Procedure

Applications
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What is an Airstroke® Actuator?
Firestone air springs are
Cylinders!
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Cylinder indexing actuator
Click to
Play
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Right angle transfer section
Click
to Play
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Crossover Example
You need to lift 1400 kg 100 mm
 50 mm bore hydraulic cylinder with 70 bar
 180 mm bore pneumatic cylinder with 6 bar
 Airstroke style 20 with 6,5 bar
 252 mm maximum diameter
 76 mm minimum height
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When someone calls for a cylinder...
Think Firestone!!!!
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WHY??
80% of industrial air springs sold in North
America are used as actuators
Firestone air springs generally maintain high
gross margins
We don’t have a lot of competition so once
you sell one, it generally stays sold
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WHY??
Our distributors are generally “fluid power”
companies, and people call you for “fluid
power” solutions to actuation problems
Tragically, it is easy to pass up potential
Firestone sales because often the persons
involved are thinking of the “traditional”
solution
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Where Should You
Start?
Design Parameter Sheets
•5 Different sheets, one for each
product/application combination
• Air spring actuation
• Air spring isolation
• MarshMellow isolation
• AirPicker ID pick and place
• AirGripper OD pick and
place
•Check lists for gathering information
•Communications tool for you, the customer,
and Firestone
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Literature

Engineering Manual and
Design Guide (MEMDG)
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Cylinder Crossover Lists
Technigram 116
Slide Rule
Training Manual page 12
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Advantages of
Firestone
Airstroke®
Actuators
Advantages of Airstroke® actuators
Low Cost
 When you get back compare a 180 mm
bore X 100 mm stroke air cylinder with a
Firestone style 20
 Compare hydraulic system to actuate a 50
mm bore X 100 mm stroke hydraulic
cylinder
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Comparison
Cost
Pneumatic Cylinder
Maintenance Cost
Cylinder
Size
Low
Grade
High
Grade
180mm bore X
150mm s troke
n/a
€ 750
Cost
Firestone Airstroke Actuator
Seals,
Estimated Time
Max Force
O-Rings Between Maintenance @ 7 bar
€ 100
3-5 years
17 kN
Style
AON
Air Inlet
Dimensions
22
W01 M58 6381
1/4 BSP
328mm OD X
305mm
Hydraulic Cylinder
Maintenance Cost
Cylinder
Size
Low
Grade
High
Grade
50mm bore X
150mm s troke
€ 250
€ 375
3-5 years
23,8 kN
€192,39
Firestone Airstroke Actuator
Seals,
Estimated Time
Max Force
O-Rings Between Maintenance @ 7 bar
€ 50
Max Force
List Price
@ 7 bar
14 kN
Style
AON
Air Inlet
Dimensions
22
W01 M58 6200
3/4 BSP
328mm OD X
305mm
Max Force
List Price
@ 7 bar
23,8 kN
€207,62
•Firestone Airbags are more cost effective than most 75 mm bore or higher cylinders
•Likelihood that firestone bag will last longer than cylinder
•No maintenance cost for Airstroke actuators
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Advantages of Airstroke® actuators
Durable Long Life
Factory Sealed and Tested
Side Loading Capability
Compact Starting Height
Angular Capability
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Advantages of Airstroke® actuators
No Maintenance or Lubrication
No Internal Rod or Piston
Friction Free for Immediate Response
Flexible Media
Air over Water System for Benefits of Hydraulics
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Application Examples
to
Show Advantages
(or WHY DO YOU CARE?)
Dynamometer

Low profile reduces installation expense

Difficult access to actuator - No maintenance or
lubrication required
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Paper Machinery
No Exposed Rod Corrosive Environment can
not damage seals
No worry about side load
bending of rod
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Woodworking Application Debarker

Friction free for immediate response

and able to take vibratory input
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Air-over-water lift table
Able to use some liquid
media
Side Load and Angular
Capability
Low starting height
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Oil Drilling Equipment

Angular Capability
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Notes about angular capability
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Stacking
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Advantages of Firestone product line

Wide Size Range
 60 mm to 950 mm diameter
 Up to 45 tons of force
 Up to 35 cm of stroke
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Precautions and
What happens when
you ignore them
Precautions

Positive Stops

Guides

Return Force

Design Envelope

Vacuum

Fail Safe Device
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Precautions
Always use positive stops
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Bottom Out
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Over Extension
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Without Stops
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Precautions

You must guide the movement
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Lift & Tilt Table
Chain used as a
positive up stop on
tilt, linkage provides
up stop any guides
on scissors.
Down stops
provided by the
frame.
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Conveyor Application
Guides and Stops –
Bolts & Nuts
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How do you get it to retract?
 Gravity
 Return
Spring
 Second Actuator
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Paper Application
Gravity
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Return Spring / Guiding
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Return Spring / Guiding
 AnotherActuator
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Design Envelope
•Bellows needs space to expand
•Provide clearance from frame
•Prevent air lines and cables from contacting
surface
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Design Envelope
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A Quick Note on Vacuum
No!
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Vacuum
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Failsafe Device
If an air system failure could cause a
pneumatic device to fail in such a way as to
create a hazard you need to provide some
mechanical means to protect people and
other equipment.
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Lift & Tilt Table
In this case the
tilt mechanism is
protected by a
damper to lower
it safely in case
of air system
failure
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Choosing the right
part
Gathering Information
Selection Procedure

Airstroke Actuator Design Parameter
Sheet

Selection Guide
 Force Requirements
 Stroke Requirements

Individual Static Data Chart

End Closure Options
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Selection Procedure
Page 103
in the MEMDG
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Selection Procedure
Required Information:
1. Stroke
2. Force
3. Minimum and
Maximum Height
4. Diameter
5. Available Pressure
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Choosing the right
part
Reading the catalog
Selection Procedure
Page 32 in the MEMDG
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Selection Procedure
Page 32
in the
MEMDG
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Selection Procedure
5 bar Force* at Stroke of
Maximum
Maximum
High
Minimum Maximum
50%
of
Diameter
Usable
Style
Maximum Strength
Height
Stroke
Maximum
25
mm
Number at 7 bar
Height
Style
Stroke
(mm)
(mm)
(kN)
Stroke
(mm)
(mm)
Number
(kN)
(kN)
SINGLE CONVOLUTION
16
152
48
36
84
3,6
DOUBLE CONVOLUTION
25
163
71
84
155
5,6
TRIPLE CONVOLUTION
352
333
267
381
32,2
114
Pg.
No.
2,5
38
4,9
2,7
55
26,2
17,6
72
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Catalog data page
Air Spring Data Page
#20-2, Pg. 60
•
Part Description
•
Part Dimensions
•
Isolation Table
•
Static Data Chart
•
Force Table
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Catalog Data Page Style 22
Page 61
in the
MEMDG
•200 mm height
• 22 kN load
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Selection Procedure (end closures)
Page 32 and 33 in
the MEMDG
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Choosing the right
part
Example
Application Example A1
Force Required = 22kN
Stroke Required = 165mm
Available Air Pressure = 7 bar
Angle of Motion = Only Vertical Motion
Lateral Space = 380mm
Environmental Conditions - Ambient Conditions
Cycle Rate = 15CPM
Response Time = N/A
Page 32-33 in the MEMDG
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Selection Guide
Page 32
in the
MEMDG
165 mm of stroke at 22 kN
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Selection Guide
20-2 & 22
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20-2
Page 60
in the
MEMDG
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22
Page 61
in the
MEMDG
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A brief note about
“effective area”
Effective Area
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Determining the Exact Pressure Needed
Effective Area = Force / Pressure
We all know that force
equals pressure times area.
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Determining the Exact Pressure Needed
Effective Area = 340 cm2
F
P
A
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Determining the Exact Pressure Needed
Pressure (bar) = 22 kN / 340 cm2
= 6,47 bar
F
P
A
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Determining the
Amount of Needed Compressed Air
#22
Page 61
Volume @ 76mm = 4000cm3
Volume @ 240mm = 12776cm3
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Determining the Amount of Free Air
Required to Get the 12.776cm3 to 6,47 bar
 Required Pressure  Atmospheric Pressure 
= Volume @ Extended Height  

Atmospheric Pressure


= 12776 cm3 x [(6,47 bar + 1 bar) / 1 bar]
Volume of Free Air = 95.437 cm3
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SCFM Calculations
Technigram #117
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Application Example A2
Force Required = 35,5kN
Stroke Required = 230mm
Available Air Pressure = ?????bar
Angle of Motion = Only Vertical Motion
Lateral Space = 460mm -1 air spring
Environmental Conditions - Ambient Conditions
Cycle Rate = N/A
Response Time = N/A
Page 32-33 in the MEMDG
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Application Example A2
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Airstroke Design Parameter Sheet
Force Required = 45kN
Stroke Required = 153mm
Available Air Pressure = 4 bar
Angle of Motion = Only Vertical Motion
Lateral Space = N/A
Environmental Conditions - Ambient Conditions
Cycle Rate = N/A
Response Time = N/A
Solution for 1, 2, and 4 air springs
Page 32-33 in the EMDG
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Summary

Air Springs are Cylinders

Cost and Engineering Advantages

Different, yet easy selection procedure

Variety of Applications and Potential
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Actuation Quiz
Quiz Handout – 10 questions
Break
Review Answers
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Actuation Quiz
REVIEW QUIZ
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The End
(of this presentation)

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