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Hydraulic

Hydraulically-operated swing clamps

single and double acting

max. clamping force: 0.6 .. 41 kN
rod diameter: 6 .. 50 mm
piston diameter: 10 .. 63 mm
clamping stroke: 6 .. 50 mm
max. operating pressure: 150 .. 500 bar

Series Data sheet Technical data
B1.848
B1.848
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B1.848 Mini swing clamps with sturdy swing mechanism

 

threaded-body type

double acting

max. operating pressure 150 bar

max. clamping force: 0.6 kN
rod diameter: 6 mm
piston diameter: 10 mm
clamping stroke: 6 mm
max. flow rate: 6 cm³/s

B1.849
B1.849
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B1.849 Compact swing clamps

 

5 connecting types

single acting

pulling force up to 2.63 kN

max. operating pressure

max. clamping force: 2.2 kN
rod diameter: 10 mm
piston diameter: 14 mm
clamping stroke: 6 mm
max. flow rate: 2.5 cm³/s

B1.8491
B1.8491
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B1.8491 Compact swing clamps with sturdy swing mechanism

 

5 connecting types

double acting

pulling force up to 2.63 kN

max. operating pressure

max. clamping force: 2.2 kN
rod diameter: 10 mm
piston diameter: 14 mm
clamping stroke: 8 mm
max. flow rate: 5 cm³/s

B1.8500
B1.8500
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B1.8500 Swing clamps with sturdy swing mechanism

 

top flange

position monitoring optional

double acting

max. operating pressure 70 bar

max. clamping force: 2 .. 13.3 kN
rod diameter: 14 .. 36 mm
piston diameter: 25 .. 65 mm
clamping stroke: 8/10 mm
max. flow rate: 13 .. 167 cm³/s

B1.8510
B1.8510
 
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B1.8510 Swing clamps with sturdy swing mechanism

 

top flange

position monitoring optional

double acting

max. operating pressure 120 bar

max. clamping force: 3.4 .. 22.8 kN
rod diameter: 14 .. 36 mm
piston diameter: 25 .. 65 mm
clamping stroke: 8/10 mm
max. flow rate: 13 .. 167 cm³/s

B1.852
B1.852
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B1.852 Swing clamps with sturdy swing mechanism

 

cartridge type

with optional position monitoring

double acting

max. operating pressure 350 bar

max. clamping force: 6 .. 22 kN
rod diameter: 16 .. 32 mm
piston diameter: 23 .. 45 mm
clamping stroke: 12 .. 15 mm
max. flow rate: 10 .. 57 cm³/s

B1.853
B1.853
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B1.853 Swing clamps with sturdy swing mechanism

 

top flange

position monitoring optional

double acting

max. operating pressure 350 bar

max. clamping force: 6 .. 30 kN
rod diameter: 16 .. 40 mm
piston diameter: 23 .. 55 mm
clamping stroke: 12/15 mm
max. flow rate: 10 .. 87 cm³/s

B1.854
B1.854
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B1.854 Swing clamps with sturdy swing mechanism

 

bottom flange

position monitoring optional

double acting

max. operating pressure 350 bar

max. clamping force: 6 .. 22 kN
rod diameter: 16 .. 32 mm
piston diameter: 23 .. 45 mm
clamping stroke: 12/15 mm
max. flow rate: 10 .. 57 cm³/s

B1.880
B1.880
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B 1.880 Swing clamps with overload protection device

 

top flange

single and double acting

max. operating pressure 500 bar

max. clamping force: 2.8 .. 41 kN
rod diameter: 20 .. 50 mm
piston diameter: 25 .. 63 mm
clamping stroke: 11 .. 50 mm
max. flow rate: 3 .. 28 cm³/s

B1.8801
B1.8801
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B1.8801 Swing clamps with reinforced swing mechanism

 

top flange

position monitoring optional

double acting

max. operating pressure 500 bar

max. clamping force: 6.8 .. 41 kN
rod diameter: 32 .. 50 mm
piston diameter: 40 .. 63 mm
clamping stroke: 20 .. 22 mm
max. flow rate: 20 .. 55 cm³/s

B1.8802
B1.8802
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B 1.8802 Swing clamps with pendulum eye or fork head

 

Top flange

position monitoring optional

reinforced swing mechanism

double acting

max. operating pressure 500/160 bar

max. clamping force: 1.4 .. 11.2 kN
rod diameter: 20 .. 32 mm
piston diameter: 25 .. 40 mm
clamping stroke: 22 .. 25 mm
max. flow rate: 8 .. 20 cm³/s

B1.8803
B1.8803
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B1.8803 Swing clamps with overload protection device

 

cartridge type

double acting

max. operating pressure 500 bar

max. clamping force: 6.8 .. 41 kN
rod diameter: 20 .. 50 mm
piston diameter: 25 .. 63 mm
clamping stroke: 11 .. 25 mm
max. flow rate: 3 .. 27 cm³/s

B1.8805
B1.8805
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B1.8805 Swing clamps with piston rod locking

top flange

reinforced swing mechanism

position monitoring optional

double acting

max. operating pressure 250 bar

max. clamping force: 8.5 .. 13 kN
rod diameter: 32 .. 40 mm
piston diameter: 40 .. 50 mm
clamping stroke: 20 .. 22 mm
max. flow rate: 20 .. 36 cm³/s

B1.8806
B1.8806
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B1.8806 Swing clamps without swing stroke

 

top flange

reinforced swing mechanism

position monitoring optional

double acting

max. operating pressure 350 bar

max. clamping force: 5 .. 18 kN
rod diameter: 20 ..40 mm
piston diameter: 25 .. 50 mm
clamping stroke: 12 .. 20 mm
max. flow rate: 5 .. 36 cm³/s

B1.881
B1.881
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B1.881 Swing clamps with overload protection device

 

bottom flange

threaded-body type

single and double acting

max. operating pressure 500 bar

max. clamping force: 2.8 .. 41 kN
rod diameter: 20 .. 50 mm
piston diameter: 25 .. 63 mm
clamping stroke: 11 .. 50 mm
max. flow rate: 3 .. 28 cm³/s

B1.8811
B1.8811
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B1.8811 Swing clamps with reinforced swing mechanism

 

bottom flange

position monitoring optional

double acting

max. operating pressure 500 bar

max. clamping force: 6.8 .. 41 kN
rod diameter: 32 .. 50 mm
piston diameter: 40 .. 63 mm
clamping stroke: 20 .. 22 mm
max. flow rate: 20 .. 55 cm³/s

B1.8812
B1.8812
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B1.8812 Swing clamps with pendulum eye or fork head

 

bottom flange

reinforced swing mechanism

position monitoring optional

double acting

max. operating pressure 350 bar 500/160 bar

max. clamping force: 1.4 .. 11.2 kN
rod diameter: 20 .. 32 mm
piston diameter: 25 .. 40 mm
clamping stroke: 22 .. 25 mm
max. flow rate: 8 .. 20 cm³/s

B1.890
B1.890
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B1.890 Swing clamps with overload protection device

 

block type

double acting

max. operating pressure 500 bar

max. clamping force: 2.8 .. 41 kN
rod diameter: 20 .. 50 mm
piston diameter: 25 .. 63 mm
clamping stroke: 7 .. 11 mm
max. flow rate: 3 .. 28 cm³/s

B1.891
B1.891
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B1.891 Swing clamps with overload protection device

 

threaded-body type

single and double acting

max. operating pressure 500 bar

max. clamping force: 4.0 kN
rod diameter: 20 mm
piston diameter: 23 mm
clamping stroke: 7 mm
max. flow rate: 1.5 cm³/s

B1.892
B1.892
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B1.892 Swing clamps with overload protection device

 

threaded-body type

single and double acting

max. operating pressure 500 bar

max. clamping force: 2.8 .. 41 kN
rod diameter: 20 .. 50 mm
piston diameter: 25 .. 63 mm
clamping stroke: 11 .. 15 mm
max. flow rate: 3 .. 28 cm³/s

B1.8921
B1.8921
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B1.8921 Swing clamps with reinforced swing mechanism

 

threaded-body type

position monitoring optional

double acting

max. operating pressure 500 bar

max. clamping force: 6.8 .. 41 kN
rod diameter: 32 .. 50 mm
piston diameter: 40 .. 63 mm
clamping stroke: 20 .. 22 mm
max. flow rate: 20 .. 55 cm³/s

Application notes for single
acting swing clamps:


Venting of the spring area
of clamping and support elements
data sheet G 0.110

General application notes
General characteristics of hydraulic equipment
data sheet A 0.100

show
figure 1: application
 
show
figure 2: function of the swing clamp
 
show
figure 3: swing direction of the swing clamp
























 
show
figure 4: option - switch rod / accessory - position monitoring
 
show
figure 5: position "Clamped" is directly controlled at the clamping arm
 
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figure 7: swing clamp with pendulum eye or fork head B1.8802 and B1.8812
 
show
figure 8: pendulum eye
 
show
figure 9: fork head
 
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figure 10: swing clamp with piston rod locking B1.8805
 
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figure 11: swing clamps without swing stroke B1.8806
 

Application (figure 1)
Hydraulic swing clamps are used for clamping of workpieces when it is essential to keep the clamping area free of straps and clamping components for unrestricted workpiece loading and unloading.

 



Function (figure 2)
A swing clamp is a pull-type cylinder where a part of the total stroke is used to swing the piston (swing stroke) and the screwed-on clamping arm. The only exception is the series as per data sheet B1.8806 where the swing motion is effected without axial stroke.



Swing direction (figure 3)
The swing clamps are available with clockwise and counterclockwise swing motion or without swing motion (0°).
"Swing direction clockwise" describes the clockwise rotation of the piston starting from the extended position (off-position). The "swing direction counterclockwise" is accordingly effected by counterclockwise rotation.
Standard swing angles are 45°, 60° and 90°.

0° version
Use as pure pull-type cylinder with a piston which is secured against torsion and which allows eccentric load as per clamping force diagram.

Versions with overload protection device
In swing clamps with overload protection device the swing mechanism is protected against damages due to a collision of the clamping arm for example with the workpiece. Snapping out of the overload protection device stops the swing motion of the clamping arm. However the complete stroke of the swing clamp will be effected.
If the overload protection device snapped out, the swing clamp has to be moved back to the off-position and the piston with the clamping arm has to be snapped in by hand.

Versions with reinforced or sturdy swing mechanism
The swing clamps without overload protection device and with reinforced or sturdy swing mechanism maintain their angular position of the clamping arm during loading and unloading, even in case of a slight collision with the clamping arm. The reinforced swing mechanism endures a collision of the clamping arm with the workpiece during clamping up to a pressure of 100 bar. Less critical are the weight of the clamping arm or an increased swing speed.

Option - switch rod / accessory - position monitoring (figure 4 - 5)
Position monitorings are available as accessory for swing clamps with reinforced swing mechanism. The positions "Unclamped" and "Clamped" are acknowledged. The position monitoring is operated by an "extended rod". This rod protrudes at the bottom of the swing clamp and is hydraulically sealed. It forms one unit together with the helix rod and allows a pneumatic or electrical monitoring of the piston position outside the swarf area.With the pneumatic position monitoring the positions can be controlled by pressure switches or differential pressure switches.In the case of electrical position monitorings the controls are effected by inductive proximity switches.

An alternative control offers the pneumatic position monitoring as per data sheet B1.852. The position "Clamped" is directly controlled at the clamping arm.

 

 

 

 

 

 

 

 

 

 

 

 

Swing clamps with pendulum eye or fork head B1.8802 and B1.8812 (figure 7)
The piston end of this swing clamp is designed as pendulum eye or fork head. By means of a double clamping arm 2 workpieces can be clamped at the same time.
For both versions a springy element is required in order to maintain the double clamping arm in the unclamped position in horizontal position.

Pendulum eye (figure 8)
The sturdy pendulum eye can transmit high clamping forces up to a max. operating pressure of 500 bar. The double clamping arm has to be dimensioned according to the load.

Fork head (figure 9)
The fork head allows a max. operating pressure of 160 bar. Advantageous is the fact that relatively simple clamping arms can be manufactured from flat materials.

 

 

 

Swing clamps with piston rod locking B1.8805 (figure 10)
The patented piston rod locking is made by friction locking by a separately-controllable double-acting wedge-shaped piston with
self-locking. In the case of a pressure drop or complete pressure reduction, the clamping force will be maintained. The wedge-shaped piston is designed as a self-locking piston so that the swing clamp can be depressurised after clamping. The previously generated clamping force will be maintained.

 

 



Swing clamps without swing stroke B1.8806 (figure 11)
The swing clamp without swing stroke is a double-acting pull-type cylinder where a part of the piston stroke is used to swing the piston rod without axial stroke.

Clamping

  • The piston rod is rotated together with the clamping arm without axial stroke (swing stroke) in the desired direction.
  • After swinging in the clamping arm above the clamping point, the linear clamping stroke will be effected.

Unclamping

  • For the linear return stroke, the clamping arm is lifted from the clamping point.
  • The piston rod swings the clamping arm without axial stroke back to the off-position.

 

Option - metallic wiper
In addition to the FKM wiper many double-acting swing clamps can be equipped with a metallic wiper.
The metallic wiper protects the FKM wiper against mechanical damage, e.g. by hot swarf or high coolant pressure.

Materials
piston material: high alloy steel, nitrated or chromium-plated
body material: high alloy steel, nitrated
By nitrating piston and body, wear is reduced and protection against corrosion increased.

Sealing materials

  • NBR = nitrile butadiene rubber trade name e.g. Perbunan operating temperature: -30 to +100 °C
  • FKM = flouro rubber trade name e.g. VITON® operating temperature: -20 to +150 °C
 

Seat of clamping arm
For mounting of clamping arms or clamping straps, normally a cone seat is provided at the piston of the swing clamp.
The cone ratio is 1 to 10. This seat is the same for all types of one size.

Maximum operating pressure
For one-sided clamping arms the maximum admissible operating pressure depends on the length of the clamping arm.
These values are indicated in the diagrams on the corresponding data sheets.
When using a double clamping arm or a clamping strap, the complete operating pressure can be applied.

Admissible flow rate
The admissible flow rate has to be kept to avoid overload, increased wear and malfunctions of the swing clamp.
Throttling has to be made in the oil supply line to the swing clamp to rule out a possible pressure intensification.
Use only flow control valves which allow oil return from the swing clamp without any impediments.
During unclamping the admissible oil flow rate can obtain a higher value, since the piston area is correspondingly bigger.

Unimpeded swing motion
The swing motion must not be impeded and the clamping arm may only contact the workpiece after completion of the swing stroke.

Tolerance of the swing angle
is ±2°, if not otherwise indicated.
For swing clamps with reinforced swing mechanism the tolerance is always ±1°.

Dimension tolerances
Dimensions without tolerance data correspond to the general tolerances in accordance with DIN ISO 2768 -mH.

Fittings
Fittings suitable for the Whitworth G pipe thread correspond to DIN 2353, screwed plug type B according to DIN 3852 sheet 2 (with sealing edge or soft seal).
Important: No additional sealing materials, such as Teflon ribbon, must be used!

Leakage rate
ROEMHELD swing clamps do not leak when static.
During displacement of the piston a residual lubricating film will be tolerated with regard to the life of sealings and guides.
Admissible leakage rates for 1,000 double strokes and hydraulic oil HLP 22 are:

  • up to 32 mm piston diameter: < 0.30 cm³
  • from 40 mm piston diameter: < 0.60 cm³

Bleeding
Air in the oil prolongs the clamping time considerably and leads to function troubles.
Therefore bleeding has to be effected during start up.

Venting of the spring area of single-acting swing clamps
If there is any danger that that aggressive cutting lubricants and coolants penetrate through the sintered metal air filter
into the cylinder's interior, a vent hose has to be connected and be placed in a protected
position.
For further notes and provisions see data sheet A 0.110.

Seal kits
for hydraulic elements

data sheet S0.001

show
figure 1: one-sided clamping arm with contact bolt
 
show
figure 2: one-sided short, cranked clamping arm
 
show
figure 3: clamping strap
 
show
figure 4: Double clamping arm
 
show
figure 5: pneumatic position monitoring
 
show
figure 6: electrical position monitoring
 
show
figure 7: pneumatic position monitoring
 
show
figure 8: built-in housing
 
show
figure 9: lock nuts as per DIN 1804
 

Accessories - clamping arms
Different clamping arms, clamping straps and double clamping arms are available as accessories. Material 42CrMo4

Mounting of clamping arms
When tightening and untightening the fixing screw, the clamping arm has to be backed up to avoid the introduction of moments to the piston rod and thereby any deterioration of the swing mechanism.

Adjustment of contact bolt
The contact bolt may only contact the workpiece after completion of the swing motion. When tightening and untightening the lock nut, the clamping arm has to be backed up.

Clamping arms, clamping straps and double clamping arms
=> see PDF data sheets of the swing clamps

One-sided clamping arm with contact bolt (figure 1)
max. operating pressure 200 bar

One-sided short, cranked clamping arm (figure 2)
max. operating pressure 300 bar

Clamping strap (figure 3)
The design of the clamping strap is asymmetric. The bearing pin is mounted on the side of the carrier. Thereby an asymmetric lever ratio is generated that provides a higher clamping force, max. operating pressure 500 bar.
The second support point of the clamping arm assembly on the right is not used for clamping but only for support.

Double clamping arm (figure 4)
The double clamping arm is designed symmetrically.
A carrier provides the connection to the piston. Thereby 2 workpieces can be clamped at the same time, the pulling force of the piston is reduced by half, max. operating pressure 500 bar.
Two pressure springs keep the clamping strap in horizontal position.

Pneumatic position monitoring (figure 5)
for swing clamps with switch rod
=> see PDF data sheets of the swing clamps

 

 

 

 

 

 

 

 



Electrical position monitoring (figure 6)
for swing clamps with switch rod
=> see PDF data sheets of the swing clamps

 

 

 

 

 

 

 

 



Pneumatic position monitoring (figure 7)
for B1.852
=> data sheet B1.852

 

 

 

 

 

Built-in housing (figure 8)
for B1.848, B1.891
=> see PDF data sheets of the swing clamps

 

 

 



Lock nuts as per DIN 1804 (figure 9)
for B1.849, B1.8491
=> see PDF data sheets of the swing clamps

Venting accessories
for venting of the spring area
of single-acting elements
data sheet A0.110

 
show
figure 1: use of swing clamps
 
show
figure 2: use of swing clamps
 

Application video:

Application example 1 (figure 1)
Use of swing clamps in a double clamping fixture for oil sumps for cars.

 

 

Application example 2 (figure 2)