SCHUNK SRU 20 User instructions

Translation of the original manual
Pneumatic Swivel Unit
SRU 20 - 60
Assembly and operation manual
Superior Clamping and Gripping

Imprint
2 12.03|SRU 20 - 60|en
Imprint
Copyright:
This manual remains the copyrighted property of SCHUNK GmbH & Co. KG. It is solely
supplied to our customers and operators of our products and forms part of the product.
This documentation may not be duplicated or made accessible to third parties, in particu-
lar competitive companies,
without our prior permission.
Technical changes:
We reserve the right to make alterations for the purpose of technical improvement.
Document number: 0389430
Edition: 12.03 |16/01/2014|en
© SCHUNK GmbH & Co. KG
All rights reserved.
Dear customer,
congratulations on choosing a SCHUNK product. By choosing SCHUNK, you have opted for
the highest precision, top quality and best service.
You are going to increase the process reliability of your production and achieve best
machining results – to the customer's complete satisfaction.
SCHUNK products are inspiring.
Our detailed assembly and operation manual will support you.
Do you have further questions? You may contact us at any time – even after purchase.
Kindest Regards
Yours SCHUNK GmbH & Co. KG
Spann- und Greiftechnik
Bahnhofstr. 106 – 134
D-74348 Lauffen/Neckar
Tel. [phone]
Fax [phone]
[email protected]
www.schunk.com

Table of contents
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3
Table of contents
1 About this manual .................................................................................................... 5
1.1 Warnings................................................................................................................... 5
1.1.1 Key words...................................................................................................... 5
1.1.2 Symbols ......................................................................................................... 5
1.2 Applicable documents .............................................................................................. 5
2 Basic safety notes .................................................................................................... 6
2.1 Intended use............................................................................................................. 6
2.2 Not intended use ...................................................................................................... 6
2.3 Environmental and operating conditions................................................................. 6
2.4 Product safety........................................................................................................... 7
2.4.1 Protective equipment ................................................................................... 7
2.4.2 Constructional changes, attachments, or modifications.............................. 7
2.5 Personnel qualification............................................................................................. 7
2.6 Using personal protective equipment...................................................................... 8
2.7 Notes on particular risks........................................................................................... 8
3 Warranty................................................................................................................. 10
4 Scope of delivery ..................................................................................................... 10
5 Technical data ......................................................................................................... 10
6 Assembly and Commissioning.................................................................................. 11
6.1 Mechanical connection .......................................................................................... 11
6.2 Air connection ........................................................................................................ 12
6.3 Adjusting the end positions.................................................................................... 15
6.4 Shock absorber travel - fine adjustment SRU 50 und SRU 60................................ 16
6.5 Adjusting the center position (variant M).............................................................. 18
6.6 Adjusting the center position (variant VM)............................................................ 19
6.7 Mounting and adjusting the sensors...................................................................... 20
6.7.1 Magnetic switch MMS 22 ........................................................................... 21
6.7.2 Inductive proximity switches with male thread M8 ................................... 22
7 Function and handling ............................................................................................. 24
7.1 Base unit ................................................................................................................. 24
7.2 Center position (variant M).................................................................................... 25
7.3 Locked center position (variant VM)...................................................................... 26
7.3.1 Mounting the separating sleeve ................................................................. 29
8 Maintenance and care ............................................................................................. 30
8.1 Maintenance intervals............................................................................................ 30

Table of contents
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8.2 Lubricants/Lubrication points (basic lubrication) ................................................. 30
8.3 Dismantling the module ......................................................................................... 31
8.3.1 Dismantling the rotary actuator ................................................................. 31
8.3.2 Disassembling the center position (variant M and VM) ............................. 32
8.4 Replacing a shock absorber.................................................................................... 33
8.4.1 How to use the shock absorbers and installation dimensions ................... 36
8.4.2 Measuring instruction................................................................................. 37
8.5 Servicing and assembling the module.................................................................... 38
9 Assembly drawings.................................................................................................. 39
10 Seal kit .................................................................................................................... 42
11 Accessories pack...................................................................................................... 43
12 Wear parts .............................................................................................................. 44
13 Translation of original declaration of incorporation................................................. 47

About this manual
12.03|SRU 20 - 60|en
5
About this manual
This instruction is an integral part of the product and contains im-
portant information for a safe and proper assembly, commission-
ing, operation, maintenance and help for easier trouble shooting.
Before using the product, read and note the instructions, especial-
ly the chapter "Basic safety notes".
Warnings
The following key words and symbols are used to highlight dan-
gers.
Key words
DANGER Dangers for persons.
Non-compliance will inevitably cause irreversible injury or death.
WARNING Dangers for persons.
Non-compliance may cause irreversible injury or death.
CAUTION Dangers for persons.
Non-observance may cause minor injuries.
NOTICE Information about avoiding material damage
Symbols
Warning about a danger point
Warning about hand injuries
General mandatory sign to prevent material damage
Applicable documents
•General terms of business
•Assembly and Operating Manuals of the accessories
The documents listed here, can be downloaded on our homepage
www.schunk.com
1
1.1
1.1.1
1.1.2
1.2

Basic safety notes
6 12.03|SRU 20 - 60|en
Basic safety notes
Intended use
The product was designed to swivel permissible attachments or
workpieces.
The product is intended for installation in a machine/system. The
requirements of the applicable guidelines must be observed and
complied with.
The product may be used only in the context of its defined applica-
tion parameters (5, Page 10).
The product is designed for industrial use.
To use this unit as intended, it is also essential to observe the
technical data and installation and operation notes in this manual
and to comply with the maintenance intervals.
Not intended use
Use which is not specified as an intended use is for instance when
the product is for example used as a pressing tool, stamping tool,
lifting tool, guide for tools, cutting tool, tensioning mean, boring
tool.
Environmental and operating conditions
•The module may be used only in the context of its defined ap-
plication parameters. (5, Page 10)
•Make sure that the module is a sufficient size for the applica-
tion.
•Make sure that the environment is clean and the ambient tem-
perature corresponds to the specifications per the catalog. Ob-
serve Maintenance and lubrication intervals (8, Page 30).
•Make sure that the environment is free from splash water and
vapors as well as from abrasive or processing dust. Exceptions
are modules that are designed specially for contaminated envi-
ronments
2
2.1
2.2
2.3

B
asic safety notes
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7
Product safety
Dangers arise from the module, if e.g.:
•the module is not used in accordance with its intended pur-
pose.
•the module is not installed or maintained properly.
•the safety and installation notes are not observed.
Avoid any manner of working that may interfere with the function
and operational safety of the module.
Wear protective equipment.
NOTE
More information is contained in the relevant chapters.
Protective equipment
Provide protective equipment per EC Machinery Directive.
Constructional changes, attachments, or modifications
Additional drill holes, threads, or attachments that are not offered
as accessories by SCHUNK may be attached only with permission
of SCHUNK.
Personnel qualification
The assembly, initial commissioning, maintenance, and repair of
the product may be performed only by trained specialist person-
nel. Every person called upon by the operator to work on the
product must have read and understood the complete assembly
and operating manual, especially the chapter "Basic safety notes"
(2, Page 6). This applies particularly to personnel only used oc-
casionally, such as maintenance personnel.
2.4
2.4.1
2.4.2
2.5

Basic safety notes
8 12.03|SRU 20 - 60|en
Using personal protective equipment
When using this product, observe the relevant industrial safety
regulations and use the personal protective equipment (PPE) re-
quired!
•Use protective gloves, safety shoes and safety goggles.
•Observe safe distances.
•Minimal safety requirements for the use of equipment.
Notes on particular risks
Generally valid:
•Remove the energy supplies before installation, modification,
maintenance, or adjustment work.
•Make sure that no residual energy remains in the system.
•Do not move parts by hand when the energy supply is con-
nected.
•Do not reach into the open mechanism or the movement area
of the unit.
•Perform maintenance, modifications, and additions outside the
danger zone.
•Secure the product during all operations against uncontrolled
activation.
•Take a precautionary approach by maintenance and disassem-
bly.
•Only specially trained staff should disassemble the product.
2.6
2.7

B
asic safety notes
12.03|SRU 20 - 60|en
9
WARNING
Risk of injury from objects falling and being ejected
•The danger zone must be surrounded by a safety fence during
operation.
WARNING
Risk of injury when the machine/system moves unexpectedly
due to failure of the energy supply or malfunction of the con-
troller.
WARNING
Risk of injury due to rotating components!
Avoidance: The danger zone must be surrounded by a safety
fence during operation.
WARNING
Risk of injury due to loosened parts and destruction of the swi-
velling unit due to damaged shock absorbers!
Avoidance: Regular inspection of the individual components on
wear and damage.
WARNING
Note that suitable emergency-off strategies (e.g. controlled shut
down) and restarting strategies (e.g. pressure build-up valves,
appropriate valve switching sequences) are needed for all
pneumatic actuators.
Cutting off the pressure in an uncontrolled manner could lead to
undefined states and behavior.

Warranty / Scope of delivery / Technical data
10 12.03|SRU 20 - 60|en
Warranty
The warranty is valid for 24 months from the delivery date to the
production facility under the following conditions:
•Intended use in 1-shift operation
•Observe the mandatory maintenance and lubrication intervals
•Observe the environmental and operating conditions
Parts touching the work piece and wear parts are not part of the
warranty.
Scope of delivery
The scope of delivery includes:
•Pneumatic Swivel Unit SRU in the ordered model.
•Accessory pack
Technical data
Basis data
Designation Value
Noise emission [dB(A)] ≤70
Pressure medium Compressed air, compressed air quality according to
ISO 8573-1:7 4 4
3
4
5

Assembly and Commissioning
12.03|SRU 20 - 60|en
11
Assembly and Commissioning
Mechanical connection
WARNING
Risk of injury when the machine/system moves unexpectedly!
Switch off power supply.
The module can be mounted from the base.
2
1
Fig. 1 Mounting possibilities
1 Use the centering sleeves from the enclosed pack.
2 Secure the module from the output side via the drill holes
provided for this purpose, or at the base using the threads.
3
42
1
2
4
Fig. 2 Mount attachment parts on the pinion
6
6.1
Assembly
Fastening
at the base

Assembly and Commissioning
12 12.03|SRU 20 - 60|en
The following mounting materials must be provided by customer:
1 Use the centering sleeves (1) from the enclosed pack.
2 Fasten the attachment on the four threaded holes (2).
3 For this, use the 2 counterbores for the centering sleeves (4).
1 The control cam retaining plate must be fixed with the center-
ing sleeves (4)
between the pinion and a customer side mounting plate.
2 Attach the mounting plate via the 4 threaded holes (2).
3 Secure attachment on the mounting plate.
Air connection
WARNING
Risk of injury when the machine/system moves unexpectedly!
Remove the energy supplies.
Make sure that no residual energy remains in the system.
NOTICE
Observe the requirements for the air supply.
(5, Page 10)"Technical Data"
•Only open the air connections required.
•Seal air connections not required using
the locking screws from the enclosed pack.
•For hose-free direct connections use the two O-rings from the
enclosed pack.
Pinion mounting
Pini
on mounting with
optional inductive
proximity switch
6.2

Assembly and Commissioning
12.03|SRU 20 - 60|en
13
1
2
34
6
5
7
8
Fig. 3 compressed air connections A, B, C and D
Ite
m
Designation Description Function
1 b Hose-free
direct connection
Swiveling 90° - 0° / 180° - 0°
2 a Swiveling 0° -90° / 0° - 180°
3 d Approach center position (M)
Extend locking piston (VM)
4 c
5 C Hose connection Approach center position (M)
Extend locking piston (VM)
6 D
7 A Swiveling 0° -90° / 0° - 180°
8 B Swiveling 90° - 0° / 180° - 0°
Pay attention to the following table when using flow controls.
1 The air connections labeled "C" and "D" must be pressurized
simultaneously (with a t-joint).
Air connection for
variants with
center position (M)

Assembly and Commissioning
14 12.03|SRU 20 - 60|en
NOTICE
In the variant with locked center position, the following can
cause malfunctions!
•Do not install an exhaust air throttle.
•Observe table
(
6.2, Page 14).
NOTE
The operating pressure of the lock must be between 4 and 6 bar.
1 Air connections "C" and "D" are available for actuating the
locked center position (6.2, Page 13).
2 The lock can be engaged smoothly using a supply air throttle.
Table. (6.2, Page 14)
1 Connections marked with numbers are provided for feedth-
rough of the media on the pinion and the flange
Use of throttles
Module variant A B C D
Without center positi-
on
Exhaust air throt-
tle / or no throttle
Exhaust air throt-
tle / or no throttle
- -
With center position
(M)
Exhaust air throt-
tle / or no throttle
Exhaust air throt-
tle / or no throttle
Supply air
throttle / or
no throttle
Supply air
throttle/ or
no throttle
With locked center
position (VM)(VM)
Exhaust air throt-
tle / or no throttle
Exhaust air throt-
tle / or no throttle
Supply air
throttle / or
no throttle /
or Fast vent
valve
Supply air
throttle / or
no throttle /
or Fast vent
valve
With locked
center position (VM)
and seperate
main piston areas
A1
Exhaust
air
throttle
/ or no
throttle
A2
no
throttle!
B1
Exhaust
air-
throttle
/ or no
throttle
B2
no
throttle!
Supply air
throttle / or
no throttle
Supply air
throttle / or
no throttle
Air connection for
variants with
locked
center position (VM)
Variant with
media feed-through

Assembly and Commissioning
12.03|SRU 20 - 60|en
15
Adjusting the end positions
Fig. 4 Basic setting
NOTICE
The end positions should not be changed by turning the axial
hexagon socket at the face, or by turning the clamping nut or
the shock absorber (VM-versions).
This way the individual components can be unscrewed.
•Please use a 19 (SRU 20 – 25) or 32 (SRU 30 – 60), which is
positioned at the hexagon of the stop cover
1 Loosen bolt (3) approx. one turn using hexagon socket wrench
(SRU 20 – 40: 4, SRU 50 – 60: 5).
2 Apply air to connection "B". Unit swivels to stop A (1) (basic
setting 0°).
3 Set the desired end position by turning stop A.
(For SRU 50-60; depressurize before adjusting)
4 Vent connection B and apply air to A.
The unit swivels to stop B (3)(basic setting 180°).
5 Set the required limit position by rotating stop B (3).
(For SRU 50-60: depressurize before adjusting)
6 Tighten Screws (2) fully.
(SRU 20-40: 10Nm; SRU 50-60: 24Nm)
7 Swivel repeatedly to test the limit position setting.
NOTICE
The limiting sleeves (depending on the variant item 7, 10 , 25)
limit the adjustment range of the stops. For safety reasons, the
unit shoud only be operated with mounted limiting sleeves.
6.3

Assembly and Commissioning
16 12.03|SRU 20 - 60|en
Shock absorber travel - fine adjustment SRU 50 und SRU 60
NOTICE
The module can leak if the maximum adjustment range is ex-
ceeded:
•Note the maximum adjustment range of 3 mm of the fine ad-
justment.
Fig. 5 Shock absorber fine adjustment
1 Stop A 2 Stop B
6.4

Assembly and Commissioning
12.03|SRU 20 - 60|en
17
NOTICE
The maximum range for fine adjustment is 3 mm. After that,
leakage begins in order to protect the unit.
1 (a) To adjust the damping in the end position 0°, loosen the
nut (1) at the limit A using a spanner 30 while counterhold-
ing the striker pin (2) with a hexagon socket key 10.
(b) To adjust the damping in the end position 180°, loosen the
nut (item 101 b) at the limit B using a spanner 30 while
counterholding the striker pin (4) with a hexagon socket key
10
2 Turning out the striker pin shortens the damping travel by 1.5
mm per revolution (max. 3 mm).
3 Swivel the loaded unit to check the damping effect.
The end positions must be arrived at gently.
4 Retighten the nuts (1 and 2).
Setting the dampen-
ing for end position
0°/180°

Assembly and Commissioning
18 12.03|SRU 20 - 60|en
Adjusting the center position (variant M)
Fig. 6 Adjusting the center position
1 Stop B 3 Interior
screw
5 Limiting sleeve
2 Stop A 4 Stop C 6 Stop D
1 Loosen the screw (3) with hexagon socket wrench (SRU 20-40:
4, SRU 50-60: 5) by approx. one turn.
2 Unscrew stops C (4) and D (6) as far as the limiting sleeve (5)
3 Apply air to the air connections marked C and D together
The unit swivels to approx. 90° and has approx. 6° play in
this position
4 Rotate the pinion clockwise and press it against stop C (4)
5 Turn stop C (4) until the desired centre position is reached
6 Turn stop D (6) until the pinion has no more play in centre po-
sition
7 Tighten the screw (3) securely again (SRU 20-40: 10Nm, SRU
50 – 60: 24 Nm)
8 Swivel the unit several times to check that the centre position
is correctly set
6.5

Assembly and Commissioning
12.03|SRU 20 - 60|en
19
Adjusting the center position (variant VM)
NOTICE
The lock could be damaged!
•Pay attention to the description of Locked center position (va-
riant VM).
Fig. 7 Adjusting of the center position locking
1 Stop B 5 Stop C
2 Stop A 6 Limiting sleeve
3 Bore hole for
hexagon socket wrench
4 Internal screw 7 Stop D
Depending on the start-up direction of (stop A (2) or stop B (1)),
the center position can be set the same or differently.
1 Ventilate all air connections.
2 Loosen the screw (4) about one turn with hexagon socket
wrench (SRU-plus 20-40:
4, SRU 50-60: 5)
3 Actuate air connection "B".
The module swivels to stop A (2).
4 Ventilate air connection "B" and pressurize air connection "C".
6.6

Assembly and Commissioning
20 12.03|SRU 20 - 60|en
Stop C (5) locks.
5 Actuate air connection "A".
The module swivels to stop C (5) (basic setting 90°).
6 Turn stop C (5) to the required center position.
7 Ventilate air connection "C".
The module swivels to stop B (1).
8 Ventilate air connection "A" and actuate air connection "D".
Stop D (7) locks.
9 Actuate air connection "B".
The module swivels to stop D (7) (basic setting 90°).
10 Turn stop D (7) to the required center position.
11 Re-tighten the screw (4) again (SRU 20-40: 10Nm,
SRU 50-60: 24Nm).
12 Swivel repeatedly to test the center position setting (7.3,
Page 27).
Mounting and adjusting the sensors
The module is prepared for the use of the sensors IN 80 and MMS
22.
1 If you require further information on sensor operation, con-
tact your SCHUNK contact person or download information
from our homepage.
2 Technical data of the sensors are contained in the data sheets
(included in the scope of delivery).
6.7