Festo GRLZ Series User manual

(en) Operating

instructions

Pneumatic linear cylinders

8104218

2018-12b

[8104220]

Festo 2018-12b

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

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

– 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

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

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. 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

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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