Description D
en
Lever arm type stretcher
SP 0901/SP 0902
1.
2.
3.
4.
5.
6.
7.
8.
Safety
Function
Mounting
Installation
Commissioning
Operation
Maintenance
Technical data
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BEA--250394-EN-06
Lever arm tensioner SP 0901/SP 0902
Explanation of symbols
 jobs to be performed
important information and instructions
appears before sections of text of which particular note must
be taken to ensure the safe operation of the lever arm type
stretcher SP 09.. .
1. Safety
1.1 Intended usage
The lever arm type stretcher SP 09.. must only be used to maintain a
constant belt tension in continuous clothing. It is not suitable for guiding belt travel.
The lever arm type stretcher is built to state of the art technology.
However during operation
- the operator’s health may be endangered or
- damage to other property incurred.
The lever arm type stretcher should only be used when
- in perfect technical condition
- for use as intended
- with regard to safety and potential dangers, observing the
operating instructions.
Work relating to the operation, adaptation to production, upgrading
or adjustment of the lever arm type stretcher and its safety features,
as well as its inspection, maintenance and repair must only be performed by qualified personnel.
1.2 Operating instructions
Please keep the instructions in a safe place, accessible to personnel
at all times.
The operating instructions are part of the package and should be
read carefully prior to assembly, operation and maintenance work.
1.3 Safety instructions
Never touch the edges of moving webs or belts.
Never reach inbetween the felt or wire belt and roller with hands or
tools.
Never touch live parts.
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Lever arm tensioner SP 0901/SP 0902
1.4 Assembly
Please observe the locally applicable and professional safety
and accident prevention regulations.
Please ensure when mounting the lever arm type stretcher that the
safety clearances between moving and fixed parts and the on-site
machinery, e.g. side panels or walkways required by the locally applicable and professional safety regulations are observed.
If these machine parts are within reach of the machine operator or
other persons they must be protected according to the locally applicable and professional accident prevention regulations.
1.5 Installation
Please observe the locally applicable and professional safety
and accident prevention regulations.
Please ensure that:
L1
Control
on-site
main machine
Lever arm type
stretcher
control
1 pole representation
- when running electrical leads that the insulation is not damaged
and the leads properly secured and protected,
- run pneumatic leads so that they do not represent any danger.
Kinks must not be allowed to form.
- the lever arm type stretcher power is switched by the on-site main
machine control,
- the lever arm type stretcher is integrated in the machine control so
that it cannot start up again autonomously after a machine standstill or emergency OFF reset.
1.6 Operation
The lever arm type stretcher should be operated by qualified or suitably instructed personnel only.
1.8 Maintenance
The lever arm type stretcher should be maintained by qualified or
suitably instructed personnel only.
Maintenance may only be performed when the on-site machine and
lever arm type stretcher are switched off.
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Lever arm tensioner SP 0901/SP 0902
2. Function
2.1 Purpose
The lever arm type stretcher SP 09.. is part of a belt tension control
system. It is used in the wire section of paper machines to maintain a
constant wire tension. Fluctuations in clothing tension due to varying
process conditions are automatically compensated, thus providing
the prerequisites for efficient production and consistent paper quality.
2.2 Design
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Belt tension control system with lever
arm type stretcher SP 0901/SP 0902
1
The belt tension control system consists of:
(1) load cell,
(2) belt tension controller
and actuator (lever arm type stretcher).
The lever arm type stretcher in turn, consists of the following modules:
(3) one drive with electro motor (optionally pneumatic motor)
(4) two lifting units
(5) two bearing supports for supporting the tension roller (optional)
(6) two lever arms
(7) one transverse shaft
The tension roller is made available by the customer.
2.2.1 Versions
The lever arm type stretcher SP 09.. is available in 2 versions. The
versions are design-oriented to their mechanical load (lifting force of
the entire system).
- SP 0901 for total lifting forces up to 35 kN
- SP 0902 for total lifting forces up to 100 kN
Both versions are corrosion-proof for use in the wet end. An electromotor or alternatively a pneumatic motor (up to 60 °C) may be used
as a drive.
The belt tension is measured electronically. The electronic measuring
sensor PD 7 allows for connection to a E+L belt tension controller or
a master control system.
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Lever arm tensioner SP 0901/SP 0902
2.3 Operating principle
The load cell measures the actual tension value of the moving belt.
In automatic mode the belt tension controller permanently compares
the belt tension actual and set values. In the event of deviations it
produces the positioning signal for lever tensioner drive. The latter
moves both lifting units on which the tension roller is mounted.The
circulating wire is hereby tightened or slackened and the belt tension
retained at a consistent preselected set value. The transverse shaft
links the two lifting units so that they react simultaneously.
In manual mode the user may trigger the drive via push buttons and
move the lifting units.
The maximum belt tension should hereby be observed, as it
is not automatically limited.
3. Mounting
The lever arm type stretcher should be mounted by qualified
or suitably instructed personnel only.
Please observe the locally applicable and professional safety
and accident prevention regulations.
3.1 Transport and unpacking
 Transport the lever arm type stretcher in the original E+L packaging only.
Manoeuvre lifting units with care due to the gears and motor.
 Check the lever arm type stretcher for damage.
 Dispose of packaging material in the proper manner.
3.2 Assembly
The lever arm type stretcher may be mounted upright, suspended or
vertically.
 Please refer to the attached dimensioned drawing for the mounting dimensions.
 Secure the lifting units on the machine frame so that they may still
be aligned.
 Align the lifting units. See illustration opposite.
Align lifting units
The diagonals d1 and d2 and the gap between the bearing centers l1 and l2 must be the same: d1=d2 and l1=l2.
 Fix the lifting units securely to the machine frame.
 Mount transverse shaft. Tighten fixing screws with torque spanner.
For tightening torque see label on transverse shaft.
 Mount the bearing supports (optional).
 Then mount the tension roller
One of the tension roller bearings must be designed as a movable
bearing so that length compensations can be made when the tension roller is set at a slant.
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Lever arm tensioner SP 0901/SP 0902
4. Installation
The lever arm type stretcher should be installed by qualified
or suitably instructed personnel only.
Please observe the locally applicable and professional safety
and accident prevention regulations.
 Perform electrical and pneumatic (only when a pneumatic motor
is used) installation according to the included circuit diagram and
controller tubing and wiring diagram.
 Run signal lines (e.g. sensor lines) away from noisy or heavy current carrying leads (e.g. motor cables).
Ensure that the signal line protection is only grounded at the belt
tension controller.
 Pneumatic lines should be run so that they do not present any
dangers. They should not have any kinks (minimum radius 50 mm
for lines supplied by E+L).
When a pneumatic motor is used, a purified, lubricated air supply
with a pressure of 4 to 7 bar must be available to assure efficient
motor operation. A maintenance unit consisiting of water separator, filter, lubricator and pressure regulator is supplied. Ensure that
the air supply tube is adequately sized.
Please ensure that the lever arm type stretcher does not start
up automatically following a machine standstill or resetting
of the emergency off device.
5. Commissioning
The lever arm type stretcher should be commissioned by
qualified or suitably instructed personnel only.
Please observe the locally applicable and professional safety
and accident prevention regulations.
During commissioning or operation no-one may remain in the
danger area around the lever arm type stretcher.
5.1 Commissioning with
E+L belt tension controller
If the delivery of lever arm type stretcher includes E+L belt
tension controller DC 7... or DC 042./242., commissioning the
lever arm type stretcher is described in the belt tension controller operating manual.
 See attached belt tension controller DC 7... or DC 042./242. operating manual.
5.2 Commissioning without
E+L belt tension controller
When implementing a lever arm type stretcher without an
E+L belt tension controller please perform commissioning as
described below.
 Please ensure that:
- the lever arm type stretcher is mounted according to the attached
layout/dimensioned drawing
- the lever arm type stretcher is parallelly aligned
- the movable bearing is mounted centrally and moves smoothly.
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Lever arm tensioner SP 0901/SP 0902
 Using the attached wiring diagram check that the individual connection leads are run correctly.
 Check the position of the limit switches that switch off the drive
of the lever arm type stretcher as soon as the tension roller has
reached an end position.
If necessary adapt the position of the limit switches to the given
installation situation.
 Then check the function of the limit switches.
If the effective direction does not match, the limit switch wiring
must be checked and corrected.
 Switch on the drive of the lever arm type stretcher.
 Check the tension roller traveling direction.
If it does not concur with the tighten/slacken function on the command station, the connection leads to the drive must be checked
and the connections corrected.
 "Slacken" the lever arm type stretcher until the tension roller has
reached its end position.
 Switch off the drive of the lever arm type strechter.
 Insert clothing.
 Switch on the drive of the lever arm type strecher and "Tighten"
until the belt tension set value is reached.
6. Operation
The lever arm type stretcher should be operated by qualified
or suitably instructed personnel only.
 See attached E+L belt tension controller DC 7... or DC 042./242.
operating manual.
When implementing lever arm type stretchers without E+L belt tension controllers, the operator can trigger the drive and move the tension carriage via push buttons.
In manual mode the maximum permissible clothing tension
should be minded as it is not limited automatically.
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Lever arm tensioner SP 0901/SP 0902
7. Maintenance
The lever arm type stretcher should be maintained by qualified or suitably instructed personnel only.
Maintenance should only be performed if the on-site machine
and lever arm type stretcher are switched off.
Lever arm type stretcher SP 09.. features maintenance-free plain
bearings in teflonized sintered metal and a lifelong lubricated spur
wheel back-geared motor. Maintenance is thus reduced to the following aspects:
7.1 Screws and gears
 Clean and lubricate the screwshaft and the screwshaft nut every 6
months.
 Check gainter every 6 months for damage or wear.
 Lubricate spindle-type lifting gear every 12 months.
For lubricating use one of the following greases:
- DEA: Spectron FO 20
- Esso: Beacon EP-2
- Shell: Darina 2
- ARAL: HTR oder HLP 2
- Molykote: Longterm 2
- Mobil: Mobilux EP 2
- Castrol: Spheerol EPL 2
- Texaco: Texando FO 20
- ADDINOL: Longlife Grease HP 2
Greasing should be included in the paper machine lubrication
plan. Regular and correct greasing extends service life.
 Check spindel and screwshaft nut for visible signes of wear approximately every two years.
 The spindle-type lifting gear should be checked by E+L service
people every 5 years.
7.2 Electro motor
 The electro motor is maintenance-free.
7.3 Pneumatic motor (optional)
 The maintenance unit lubricator must be set so that 1 to 3 drops
of oil are used per minute when the motor is running continuously.
Oil consumption should be checked regularly.
The oil level should be between the two markings on the lubricator. The oil used should be acid and resin-free and contain no
solid matter. High quality hydraulic oils from the following manufacturers are recommended here:
-
ARAL Eural Hyd 32
BP Enersyn RC-1 32
MOBIL Jet Oil 2
KLÜBER Tyreno Fluids 3/6V
SHELL Aeroshell Turbine Oil 555
 Replace the pneumatic motor every 5000 to 8000 operating hours.
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Lever arm tensioner SP 0901/SP 0902
7.4 Load sensor
8. Technical data
 Wet end: Clean the load sensor every 4 weeks and check for freedom of movement.
Lever arm tensioner
SP 0901
Max. lifting force of the entire system
(in any osition)
35 kN
Max. tensioning stroke without bearing support 600 mm
Spindle size
TR 50 x 8 mm
Positioning speed
max. (upper limit position)
85 mm/min
min. (lower limit position)
147 mm/min
Diameter bearing bracket
(bearing bracket optional)
80 to 250 mm
Possible use
wet
Material
1.4571
Ambient temperature
+10 to +60 °C
Limit of travel
inductive proximity switch
Power consumption
0,75 kW
Operating Voltage
400/230 V 50/60 Hz
Current consumption
1,89/3,27 A
Protection class
IP 66
Subject to technical modification without notice!
SP 0902
100 kN
750 mm
TR 65 x 10 mm
89,5 mm/min
174 mm/min
180 bis 340 mm
2,2 kW
8,8/5,1 A
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Erhardt + Leimer GmbH
Postfach 10 15 40
D-86136 Augsburg
Telefon (0821) 24 35-0
Telefax (0821) 24 35-6 66
Internet http://www.erhardt-leimer.com
E-mail [email protected]