Festo GRLZ Series User manual
(en) Operating
instructions
Pneumatic linear cylinders
8104218
2018-12b
[8104220]
Festo 2018-12b
2
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
èResult of an action/References to more detailed information
Pneumatic linear cylinder
Festo 2018-12b English 3
For all available product documentation èwww.festo.com/pk
1 Operating elements and connectionsEnglish
1
1
11
1
2
2
2
2
3
3
3
4
3
5
5
5
2
3
1Fastening 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
2Compressed air connections in the
bearing/end covers or directly in the
housing
3Thread for fastening the load:
– external thread on the piston rod
– internal thread in the piston rod
or
– internal thread in the font plate
4Adjusting screws for end position
cushioning in the bearing/end covers
(only on cylinders with adjustable end
position cushioning)
5Groove for proximity switch
Pneumatic linear cylinder
Festo 2018-12b English
4
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.
SEnsure that the specifications in this chapter are always observed. This is the
only way to ensure correct and safe operation of the product.
SObserve the maximum limits specified in
the catalogue (e.g. for pressures, forces,
torques, masses, speeds, temperatures).
SMake sure there is a supply of correctly-
prepared compressed air.
SPlease observe the prevailing ambient
conditions.
SObserve also the standards specified in
the relevant chapters, as well as national
and local laws and technical regulations.
SRemove all transport safety measures
such as protective wax, foils, caps,
cardboard boxes.
The individual materials can be stored in
containers for recycling purposes.
C%mbar
Fig. 1
Fig. 2
LF-...
LR-...
40 μm
Pneumatic linear cylinder
Festo 2018-12b English 5
SUse 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.
SSlowly pressurize the complete system.
This will prevent uncontrolled movements
from occurring.
4 Installation
Mechanical installation
SCheck whether the type designation of the cylinder to be fitted is the same as
that of the desired cylinder.
SHandle 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.
SPlace the cylinder on the support so that
the adjusting screws for the end position
cushioning are always accessible.
SMake sure that:
– external guides, if used, are fitted
parallel,
– they are not distorted and
– the maximum permitted loadings as
per catalogue are not exceeded.
SObserve the maximum tightening torques specified in the catalogue for
screws, locking nuts or accessories.
Fig. 3
Fig. 4
Fig. 5
Fig. 6
Pneumatic linear cylinder
Festo 2018-12b English
6
Pneumatic installation
Definition
Moveable mass = work load + piston (rod) mass
SUse one-way flow control valves for setting the speed of the piston.
With single-acting cylinders With double-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.
SCheck 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:
SAvoid 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
coupling
A rigid coupling will impair the service life and the function of the cylinder.
5 Commissioning
Complete system
SSlowly pressurize the complete system.
This will prevent uncontrolled movements from occurring.
For slow start-up pressurization use safety start-up valve type HEL-....
Pneumatic linear cylinder
Festo 2018-12b English 7
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.
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. 8
Fig. 9
Pneumatic linear cylinder
Festo 2018-12b English
8
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
With non-adjustable end position
cushioning
The piston should reach the end posi
tions safely at the desired cycle times,
but not strike hard against them.
The maximum limits for masses, speeds
and energy specified in the catalogue
must be observed.
Fig. 10
6 Operation
Warning
SMake 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:
SUse suitable external shock absorbers or external stops.
Fig. 11
Pneumatic linear cylinder
Festo 2018-12b English 9
SPlace the proximity switches as follows:
With cylinders with groove With cylinders without groove
In the integrated groove for proximity
switches.
Or with a fastening kit so that the
proximity switches lie properly on the
cylinder barrel.
Fig. 12
SAlways use proximity switches at the distances specified.
If the gap is too large, the switch will not be actuated reliably.
7 Care and maintenance
SIf 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:
SMake use of the opportunity to have your cylinder overhauled by the Festo
repair service.
SOrder 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.
Pneumatic linear cylinder
Festo 2018-12b English
10
SMake sure that your cylinder corresponds
to the type designation in the catalogue.
Replacing worn parts
Warning
SMake sure that the bearing cover
cannot suddenly fly off.
Situation Single-
acting
cylinders
Tubing with
non-return
valves
Possible
procedure
The spring
unbends
suddenly
The pressure
is released
suddenly
Counter
measure
Use counter
holding
device
Remove non-
return valves
Fig. 15
SHandle 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:
SSend the piston rod together with the screwed-on piston to Festo.
SObserve 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.
Fig. 13
Fig. 14
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