Pneumatic linear cylinders
(en) Operating
instructions
8104218
2018-12b
[8104220]
Translation of the original instructions
Pneumatic linear cylinder
Identification of hazards and instructions on how to prevent them:
Danger
Immediate dangers which can lead to death or serious injuries
Warning
Hazards that can cause death or serious injuries
Caution
Hazards that can cause minor injuries
Other symbols:
Note
Material damage or loss of function
Recommendations, tips, references to other documentation
Essential or useful accessories
Information on environmentally sound usage
Text designations:
Activities that may be carried out in any order
1. Activities that should be carried out in the order stated
– General lists
è Result of an action/References to more detailed information
2
Festo 2018-12b
Pneumatic linear cylinder
For all available product documentation è www.festo.com/pk
1 Operating elements and connectionsEnglish
1
2
3
1
2
3
1
2
3
4
1 Fastening possibilities depending on
design:
– through-holes in the housing /
bearing cover / end cover in the
integrated flange – internal thread
in the screws of the bearing cover or
end cover
– external thread on the bearing cover /
end cover
– transverse bore in the flattened pivot
of the bearing cover / end cover
2 Compressed air connections in the
bearing/end covers or directly in the
housing
5
5
5
1
2
3
1
2
3
3 Thread for fastening the load:
– external thread on the piston rod
– internal thread in the piston rod
or
– internal thread in the font plate
4 Adjusting screws for end position
cushioning in the bearing/end covers
(only on cylinders with adjustable end
position cushioning)
5 Groove for proximity switch
Festo 2018-12b English
3
Pneumatic linear cylinder
2 Function
When the zylinder chamber is pressurized, the piston moves forwards in the barrel.
The piston rod transmits the movement to the outside. The extended piston rod is
moved back by spring force on single-acting cylinders and by pressurization of the
other cylinder chamber on double-acting cylinders.
The end positions can be detected by means of proximity switches in the grooves.
On double-acting cylinders, the cross-sectional area of the piston rod causes
differences of force between forward stroke and the return stroke (exception: with
double-ended piston rod).
3 Conditions of use
Please note
Incorrect handling can result in malfunctions.
S Ensure that the specifications in this chapter are always observed. This is the
only way to ensure correct and safe operation of the product.
S Observe the maximum limits specified in
C
%
mbar
the catalogue (e.g. for pressures, forces,
torques, masses, speeds, temperatures).
S Make sure there is a supply of correctly-
prepared compressed air.
Fig. 1
S Please observe the prevailing ambient
conditions.
S Observe also the standards specified in
LF-...
LR-...
the relevant chapters, as well as national
and local laws and technical regulations.
S Remove all transport safety measures
such as protective wax, foils, caps,
cardboard boxes.
40 μm
Fig. 2
The individual materials can be stored in
containers for recycling purposes.
4
Festo 2018-12b English
Pneumatic linear cylinder
S Use the same medium composition
throughout the service life of the product.
Example:
selected: non-lubricated compressed air
continue to use: non-lubricated com
pressed air.
S Slowly pressurize the complete system.
This will prevent uncontrolled movements
from occurring.
Fig. 3
4 Installation
Mechanical installation
S Check whether the type designation of the cylinder to be fitted is the same as
that of the desired cylinder.
S Handle the cylinder with care so that the
cylinder barrel and the piston rod are not
damaged.
This would reduce operational reliability
and the service life.
S Place the cylinder on the support so that
the adjusting screws for the end position
cushioning are always accessible.
S Make sure that:
– external guides, if used, are fitted
parallel,
– they are not distorted and
– the maximum permitted loadings as
per catalogue are not exceeded.
S Observe the maximum tightening torques specified in the catalogue for
screws, locking nuts or accessories.
Fig. 4
Fig. 5
Fig. 6
Festo 2018-12b English
5
Pneumatic linear cylinder
Pneumatic installation
Definition
Moveable mass = work load + piston (rod) mass
S Use one-way flow control valves for setting the speed of the piston.
With single-acting cylinders
Type GRLZ (supply air flow control) Type GRLA (exhaust flow control)
Fig. 7
The GRL..-... are screwed directly into the compressed air ports. Other acces
sory parts with excessive screw-in length will damage the cushioning piston.
S Check to see if closed-loop controlled non-return valves type HGL-... are
necessary.
You will then prevent the moveable mass sliding down if there is a drop in
pressure when the product is fitted in a vertical or sloping position.
If an external guide is used:
S Avoid a mechanical overdetermination of the piston rod by one of the following
measures:
– absolutely exact alignment (general)
– the use of a self-aligning rod coupling type FK-...
– the use of a guide unit type FEN-... with compensating
A rigid coupling will impair the service life and the function of the cylinder.
5 Commissioning
With double-acting cylinders
coupling
Complete system
S Slowly pressurize the complete system.
This will prevent uncontrolled movements from occurring.
For slow start-up pressurization use safety start-up valve type HEL-....
6
Festo 2018-12b English
Pneumatic linear cylinder
Individual unit
Warning
1. Make sure that:
– nobody can place his/her hand in the
positioning range of the moveable
mass
– there are no objects in the positioning
range.
2. Close both upstream one-way flow control valves:
– at first completely,
– then loosen approximately one turn.
3. Close the adjusting screws for the end position cushioning
– at first completely (with DNCB-.. close completely);
– then loosen again approximately one turn (with DNCB-... ¼ turn).
4. Note that adjustable end position cushionings may have no effect if used in
conjunction with fitted quick exhaust valves.
This depends on the flow ratio of the exhaust air.
5. Exhaust the cylinder slowly on one side.
Otherwise excessive loadings will occur during the first move, if the piston
moves too quickly into an end position.
For slow start-up pressurization use safety start-up valve type HEL-....
6. Start a test run.
7. During a test run check whether the following settings on the cylinder need to
be modified:
– the end position cushioning
– the speed of the moveable mass.
Fig. 8
Festo 2018-12b English
With masses which project longitudinally
over the bearing/end cover:
In this case the following screws may only
be turned when the cylinder is at a stand:
– the adjusting screws for the one-way
flow control valves
– the adjusting screws for the end posi
tion cushioning.
Fig. 9
7
Pneumatic linear cylinder
8. Unscrew the one-way flow control valves slowly until the desired piston speed
is reached.
9. Open the adjusting screws on both sides as desired for the end position
cushioning.
The following applies for the cushioning setting:
With adjustable end position
cushioning
The piston should reach the end posi
tions safely at the desired cycle times,
but not strike hard against them.
Fig. 10
6 Operation
Warning
S Make sure that:
– nobody can place his/her hand in the
positioning range of the moveable
mass
– there are no objects in the position-
ing range.
It must not be possible to touch the cylinder until the mass has come to a
complete stand.
With a large work load, high piston speed or when quick exhaust valves are used:
S Use suitable external shock absorbers or external stops.
With non-adjustable end position
cushioning
The maximum limits for masses, speeds
and energy specified in the catalogue
must be observed.
Fig. 11
8
Festo 2018-12b English
Pneumatic linear cylinder
S Place the proximity switches as follows:
With cylinders with groove
In the integrated groove for proximity
switches.
Fig. 12
S Always use proximity switches at the distances specified.
If the gap is too large, the switch will not be actuated reliably.
7 Care and maintenance
S If the piston rod is dirty, clean it with a soft cloth.
All non-abrasive cleaning agents are permitted.
Otherwise the cylinders do not require maintenance due to their service life
lubrication. Regular removal of the lubricating grease on the surface of the
piston rod will reduce the service life.
8 Dismantling and repairs
With non-roller-burnished cylinders:
S Make use of the opportunity to have your cylinder overhauled by the Festo
repair service.
S Order a suitable wearing-parts set if your cylinder shows the following signs of
wear:
– loss of power during operation
– increased air consumption
– (noise emission).
An overview of wearing parts available can be found at the Internet address
(see last page of these instructions).
Roller-burnished cylinders cannot be overhauled.
With cylinders without groove
Or with a fastening kit so that the
proximity switches lie properly on the
cylinder barrel.
Festo 2018-12b English
9
Pneumatic linear cylinder
S Make sure that your cylinder corresponds
to the type designation in the catalogue.
Replacing worn parts
Warning
S Make sure that the bearing cover
cannot suddenly fly off.
Fig. 13
Situation
Possible
procedure
Counter
measure
Fig. 15
Singleacting
cylinders
The spring
unbends
suddenly
Use counter
holding
device
Tubing with
non-return
valves
The pressure
is released
suddenly
Remove nonreturn valves
Fig. 14
S Handle the individual parts of the cylinder with care so that the sealing edges
and the guide surfaces are not damaged (e.g. by using suitable mounting aids).
Particulary burrs on sealing surfaces can reduce operational reliability.
If the piston rod is distorted:
S Send the piston rod together with the screwed-on piston to Festo.
S Observe the following points when fitting the cylinder together again:
– Use a locking agent on all screwed parts.
– Lubricate the moving parts or specified parts with the lubricating grease
supplied.
– The environment must be clean.
10
Festo 2018-12b English
Pneumatic linear cylinder
9 Accessories
The necessary accessories for the individual cylinder types can be found in the
Festo Catalogue.
10 Trouble-shooting
Fault Possible cause Remedy
Uneven movement
of the piston
(cylinder jerks)
Lubrication missing Lubricate with correct grease
Flow control valves inserted
incorrectly
Piston rod dirty Clean, provide cover (after intensive
Not enough supply air
(stick slip)
Not enough pressure Switch volume upstream
Piston seal or piston rod
seal defective
Guide not parallel to
direction of stroke
(e.g. as per instructions with
wearing parts)
If possible restrict exhaust
cleaning or subsequent lubrication)
– Keep the tubing short and select
suitable cross-sectional areas
– Select correct pressure
– Keep pressure constant
Send the cylinder to Festo for
repairs or
Replace wearing parts
Use a self-aligning rod coupling as
per “Accessories”
(see specifications in catalogue)
Festo 2018-12b English
11
Pneumatic linear cylinder
Fault RemedyPossible cause
Piston does not
reach the stroke
end position
Incorrect
switching during
position
recognition
Fig. 16
Cylinder barrel damaged Replace cylinder
Adjusting screw of end
position cushioning
completely closed
Foreign matter in the
cylinder
Cylinder moves to an
external end stop
Temperatures too high/low Observe the permitted temperature
Fault in the proximity
switch
Piston without magnet
fitted
11 Technical specifications
Type
Medium Filtered compressed air (filter fineness: 40 μm),
Open adjusting screw
Remove foreign matter, filter the
compressed air
Readjust end stop
range of the proximity switches
See instructions for proximity
switch
Use piston with magnet
lubricated or non-lubricated
Mounting position As desired
End-position cushioning – Elastic cushioning rings/plates (P cushioning)
Fig. 17
12
– Pneumatic cushioning (PPV cushioning)
– Self-adjusting shock absorber (YSR cushioning)
– Adjustable shock absorber (YSRJ cushioning)
Festo 2018-12b English
Festo 2018-12b
13
Copyright:
Festo AG & Co. KG
Ruiter Straße 82
73734 Esslingen
Germany
Phone:
+49 711 347-0
Fax:
+49 711 347-2144
Reproduction, distribution or sale of this document or communica
tion of its contents to others without express authorization is
prohibited. Offenders will be liable for damages. All rights re
served in the event that a patent, utility model or design patent is
registered.
E-mail:
service_international@festo.com
Internet:
www.festo.com
Loading...