Hydraulic
Hydraulically-operated swing clamps
single and double acting
Series (21)
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double acting, top flange, without monitoring – max. pull force 7.5 kN, Ø 23/16 mm – total stroke 23 mm, swing angle 0° – without metallic wiper – max. 350 bar, as per data sheet B1.853 -
double acting, top flange, without monitoring – max. pull force 7.5 kN, Ø 23/16 mm – total stroke 23 mm, swing angle 0° – with metallic wiper – max. 350 bar, as per data sheet B1.853
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double acting, top flange, without monitoring – max. pull force 7.5 kN, Ø 23/16 mm – clamping stroke 12 mm, swing stroke 4,2 mm – swing angle 15° ccw, without metallic wiper – max. 350 bar, as per data sheet B1.853
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double acting, top flange, without monitoring – max. pull force 7.5 kN, Ø 23/16 mm – clamping stroke 12 mm, swing stroke 4,2 mm – swing angle 15° ccw, with metallic wiper – max. 350 bar, as per data sheet B1.853
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double acting, top flange, without monitoring – max. pull force 7.5 kN, Ø 23/16 mm – clamping stroke 12 mm, swing stroke 4,2 mm – swing angle 15° cw, without metallic wiper – max. 350 bar, as per data sheet B1.853
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double acting, top flange, without monitoring – max. pull force 7.5 kN, Ø 23/16 mm – clamping stroke 12 mm, swing stroke 4,2 mm – swing angle 15° cw, with metallic wiper – max. 350 bar, as per data sheet B1.853
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double acting, top flange, without monitoring – max. pull force 7.5 kN, Ø 23/16 mm – clamping stroke 12 mm, swing stroke 4,6 mm – swing angle 20° ccw, without metallic wiper – max. 350 bar, as per data sheet B1.853
-
double acting, top flange, without monitoring – max. pull force 7.5 kN, Ø 23/16 mm – clamping stroke 12 mm, swing stroke 4,6 mm – swing angle 20° ccw, with metallic wiper – max. 350 bar, as per data sheet B1.853
-
double acting, top flange, without monitoring – max. pull force 7.5 kN, Ø 23/16 mm – clamping stroke 12 mm, swing stroke 4,6 mm – swing angle 20° cw, without metallic wiper – max. 350 bar, as per data sheet B1.853
-
double acting, top flange, without monitoring – max. pull force 7.5 kN, Ø 23/16 mm – clamping stroke 12 mm, swing stroke 4,6 mm – swing angle 20° cw, with metallic wiper – max. 350 bar, as per data sheet B1.853
Application
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.
application
Function
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.
function of the swing clamp
Swing direction
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°.
swing direction of the swing clamp
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
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.
position "Clamped" is directly controlled at the clamping arm
option - switch rod / accessory - position monitoring
Swing clamps with pendulum eye or fork head B1.8802 and B1.8812
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.
swing clamp with pendulum eye or fork head B1.8802 and B1.8812
Pendulum eye
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.
pendulum eye
Fork head
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.
fork head
Swing clamps with piston rod locking B1.8805
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 clamp with piston rod locking B1.8805
Swing clamps without swing stroke B1.8806
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.
swing clamps without swing stroke B1.8806
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
Technology
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.
PDF Data sheets
Mini swing clamps with sturdy swing mechanism threaded-body type – double acting – max. operating pressure 150 bar
Catalogue sheet B1.848Compact swing clamps 5 connecting types – single acting – pulling force up to 2.63 kN – max. operating pressure
Catalogue sheet B1.849Compact swing clamps with sturdy swing mechanism 5 connecting types – double acting – pulling force up to 2.63 kN – max. operating pressure
Catalogue sheet B1.8491Swing clamps with sturdy swing mechanism top flange – position monitoring optional – double acting – max. operating pressure 70 bar
Catalogue sheet B1.8500Swing clamps with sturdy swing mechanism top flange – position monitoring optional – double acting – max. operating pressure 120 bar
Catalogue sheet B1.8510Swing clamps with sturdy swing mechanism cartridge type – with optional position monitoring – double acting – max. operating pressure 350 bar
Catalogue sheet B1.852Swing clamps with sturdy swing mechanism top flange – position monitoring optional – double acting – max. operating pressure 350 bar
Catalogue sheet B1.853Swing clamps with sturdy swing mechanism bottom flange – position monitoring optional – double acting – max. operating pressure 350 bar
Catalogue sheet B1.854Swing clamps with overload protection device top flange – single and double acting – max. operating pressure 500 bar
Catalogue sheet B1.880Swing clamps with reinforced swing mechanism top flange – position monitoring optional – double acting – max. operating pressure 500 bar
Catalogue sheet B1.8801Swing clamps with pendulum eye or fork head Top flange – position monitoring optional – reinforced swing mechanism – double acting – max. operating pressure 500/160 bar
Catalogue sheet B1.8802Swing clamps with overload protection device cartridge type – double acting – max. operating pressure 500 bar
Catalogue sheet B1.8803Swing clamps with piston rod locking top flange – reinforced swing mechanism – position monitoring optional – double acting – max. operating pressure 250 bar
Catalogue sheet B1.8805Swing clamps without swing stroke top flange – reinforced swing mechanism – position monitoring optional – double acting – max. operating pressure 350 bar
Catalogue sheet B1.8806Swing clamps with overload protection device bottom flange – threaded-body type – single and double acting – max. operating pressure 500 bar
Catalogue sheet B1.881Swing clamps with reinforced swing mechanism bottom flange – position monitoring optional – double acting – max. operating pressure 500 bar
Catalogue sheet B1.8811Swing 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
Catalogue sheet B1.8812Swing clamps with overload protection device block type – double acting – max. operating pressure 500 bar
Catalogue sheet B1.890Swing clamps with overload protection device threaded-body type – single and double acting – max. operating pressure 500 bar
Catalogue sheet B1.891Swing clamps with overload protection device threaded-body type – single and double acting – max. operating pressure 500 bar
Catalogue sheet B1.892Swing clamps with reinforced swing mechanism threaded-body type – position monitoring optional – double acting – max. operating pressure 500 bar
Catalogue sheet B1.8921Application examples
Application video:
Application example 1
Use of swing clamps in a double clamping fixture for oil sumps for cars.
use of swing clamps
Application example 2
use of swing clamps
Case studies
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