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Hydro-cylinders

Hydraulic cylinders, design with tube

 

double acting

piston diameter: 25 .. 80 mm
rod diameter: 16 .. 50 mm
stroke: 60 .. 1200 mm
max. push force: 9.8 .. 125.7 kN
max. operating pressure: 200 / 250 bar

Series Data sheet Technical data
B1.2811
B1.2811
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B1.2811 Hydro-cylinders

 

without stroke end cushioning

short version

max. operating pressure 200 bar

piston diameter: 25 .. 80 mm
rod diameter: 16 .. 50 mm
max. push force: 9.8 .. 100.5 kN
standard strokes: 100 .. 1000 mm

B1.282
B1.282
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B1.282 Hydro-cylinders

 

with optional stroke end cushioning

double acting

max. operating pressure 200 bar

piston diameter: 25 .. 80 mm
rod diameter: 16 .. 50 mm
max. push force: 9.8 .. 100.5 kN
strokes in mm steps: 60 .. 1200 mm

B1.590
B1.590
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B1.590 Hydraulic block cylinders

 

Block cylinders, design with tube

double acting

max. operating pressure 250 bar

piston diameter: 25 .. 80 mm
rod diameter: 16 .. 50 mm
max. push force: 12.3 .. 125.7 kN
strokes in mm steps: 60 .. 1200 mm

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figure 1: cylinder tube design of hydro-cylinder B1.2811

 
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figure 2: manifold mounting of hydraulic block cylinder B1.590
 
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figure 3: hydro-cylinder B1.282 with adjustable stroke end cushioning
 
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figure 4: hydraulic block cylinder B1.590 with strok end control
 

Hydro-cylinders are used for clamping of workpieces or for hydraulically-operated motion and operation tasks. With the cylinder tube design, strokes of up to 1,200 mm can be realised (figure 1).

Besides the two hydro-cylinder series, the hydraulic block cylinder series B1.590 is offered, that can be manifold mounted at the housing (figure 2).

Hydro-cylinder with adjustable stroke end cushioning (figure 3)
The stroke end cushioning throttles the flow rate in the last millimetres of the stroke (e.g. 8 mm) and reduces the piston speed and the energy in the end positions. The stroke end cushioning is adjustable and the cushioning effect can be adapted to the corresponding application. In addition, both end positions can be separately adjusted.

Stroke end control with high-pressure resistant proximity sensors (figure 4)
For every end position, the cylinder housing is given a hole with interior thread, into which a high-pressure resistant, interactive proximity sensor can be screwed. The sensor checks the piston of the cylinder directly. It is sealed on the outside with an O-ring. By means of the switching distance between the sensor and the piston, the switching point can be adjusted to 5 mm before the end position. Only the end positions of the hydro-cylinder are checked by the high-pressure resistant sensors.

 
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figure 1: adjusting screws of the stroke end cushioning of the hydro-cylinder
 
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figure 2: stroke end control with high-pressure resistant proximity sensors
 

Adjustable stroke end cushioning (figure 1)
If hydraulic cylinders are operated at high speeds, when the piston hits the stroke end position unimpeded, a high amount of energy is released and must be absorbed by the cylinder housing and the threaded bushing. This can lead to a reduction in the cylinder's working life. This can also result in undesirable effects on the actual function, caused by shaking and noise coming from the knocking. Reducing the speed helps, of course. If this is not possible, however, it is recommended to use a cylinder with integrated hydraulic stroke end cushioning.
In the last few millimetres of the stroke (e.g. 8 mm), this stroke end cushioning forces the hydraulic fluid through a hole or similar. By means of this orifice effect, the flow rate is throttled and the piston speed and the energy in the end positions is thus reduced.
The stroke end cushioning of the hydro-cylinders is adjustable and the cushioning effect can be adapted to the corresponding application. In addition, both end positions can be separately adjusted.

Stroke end control with high-pressure resistant proximity sensors (figure 2)
For every end position, the cylinder housing is given a hole with interior thread, into which a high-pressure resistant, interactive proximity sensor can be screwed. The sensor checks the piston of the cylinder directly. It is sealed on the outside with an O-ring.
By means of the switching distance between the sensor and the piston, the switching point can be adjusted to 5 mm before the end position.
Only the end positions of the hydraulic cylinder are checked by the high-pressure resistant sensors. The maximum operating temperature of the sensors is 80°C or 120°C.

Maximum piston speed
The maximum piston speed for all series is 0.5 m/s.

 

Seal kits
for hydraulic elements

data sheet S0.001

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figure 1: mounting flange at front
 
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figure 2: mounting flange at rear
 
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figure 3: spherical bearing
 
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figure 4: contact bolts and coupling pins
 

Mounting flanges for hydro-cylinders (figure 1 and 2)
see PDF data sheets

 

 

 

 

Spherical bearing for hydro-cylinders B1.282 (figure 3)
(Rod end bearings and bearing blocks)
data sheet G3.810

Contact bolts and coupling pins (figure 4)
for piston rods with internal thread
data sheet G3.800

 
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figure 1: hydro-cylinders B1.2811
 
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figure 2: flexible riveting device for frames with hydraulic block cylinders B1.590
 
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figure 3: injection mould with hydro cylinder B1.282





























 
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figure 4: injection mould with hydro-cylinder with stroke end cushioning B1.282
 

Application example 1 (figure 1)
The shown hydro-cylinder B1.2811 is used for operation of a clamping plate in a special fixture for machining of aluminium parts.

 

 

 

Application example 2 (figure 2)
Flexible riveting device for frames with hydraulic block cylinders B1.590
From the User - For the User 113

Application example 3: Injection mould (figure 3)

Special feature:
Thread at the injection side

Construction possibility:
Before opening of the form the thread has to be twisted off.

Requirements:
Control of core-puller at the injection moulding machine.
Change rotating movement into linear movement.
Equip tool with limit switches to control cylinder position "on" and "off".

Selected:
Hydro-cylinder operates a toothed rack which moves in and out the threaded core by means of a gear.
Hydro-cylinder Ø 50/32 x 320 stroke
Part no. 1296-10-0320
data sheet B 1.282

Cycle (portrayed in simplified terms)
1. Mould closed, injected
2. Toothed rack retracts, threaded spindle is moved out
3. Limit switch gives signal "open mould"
4. Mould opens
5. Workpiece will be ejected
6. Mould closes
7. Toothed rack extends, threaded spindle is moved in
8. Limit switch gives signal „Substance to be injected“
9. Substance is injected
1. New cycle

Application example 4: Injection mould (figure 4)

Special feature:
Product requires a slide way of approx. 250 mm

Construction possibility:
Operation of slide by hydro-cylinder
Arrangement of slide mould "above"
Slide guiding with STAR-Double-Linear-Set

Requirements:
Control of core-puller at the injection moulding machine.
Equip tool with limit switches to control cylinder position "on" and "off".
Equip tool with limit switches to control the ejector plates "position at the back".

Selected:
Hydro-cylinder with stroke end cushioning
Ø 50/32 x 250 stroke
Part no. 1296-12-0250
data sheet B 1.282

Cycle (portrayed in simplified terms)
1. Mould closed, injected
2. Mould opens
3. Hydraulic block cylinder pulls the core out of the mould
4. Limit switch gives signal "ejector system forward"
5. Ejector system forwards
6. Workpiece falls
7. Ejector system backwards
8. Limit switch gives signal "Insert core"
9. Hydraulic block cylinder pushes the core into the mould
10. Limit switch gives signal "close mould"
11. Mould closes
12. Substance is injected
1. New cycle