Hydro-cylinders
Hydraulic cylinders, design with tube
double acting
Serie (1)
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Ø25/16 x 320 mm stroke – without cushioning – 200 bar, see page B1.2811 -
Ø32/20 x 320 mm stroke – without cushioning – 200 bar, see page B1.2811
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Ø40/25 x 320 mm stroke – without cushioning – 200 bar, see page B1.2811
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Ø50/32 x 320 mm stroke – without cushioning – 200 bar, see page B1.2811
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Ø63/40 x 320 mm stroke – without cushioning – 200 bar, see page B1.2811
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Ø80/50 x 320 mm stroke – without cushioning – 200 bar, see page B1.2811
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 (cylinder tube design of hydro-cylinder B1.2811 ).
cylinder tube design of hydro-cylinder B1.2811
Besides the two hydro-cylinder series, the hydraulic block cylinder series B1.590 is offered, that can be manifold mounted at the housing (manifold mounting of hydraulic block cylinder B1.590).
manifold mounting of hydraulic block cylinder B1.590
Hydro-cylinder with adjustable stroke end cushioning
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.
hydro-cylinder B1.282 with adjustable stroke end cushioning
Stroke end control with high-pressure resistant proximity sensors
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.
hydraulic block cylinder B1.590 with strok end control
Technology
Adjustable stroke end cushioning
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.
adjusting screws of the stroke end cushioning of the hydro-cylinder
Stroke end control with high-pressure resistant proximity sensors
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.
stroke end control with high-pressure resistant proximity sensors
Maximum piston speed
The maximum piston speed for all series is 0.5 m/s.
PDF Data sheets
Hydro-cylinders without stroke end cushioning – short version – max. operating pressure 200 bar
Catalogue sheet B1.2811Hydro-cylinders with optional stroke end cushioning – double acting – max. operating pressure 200 bar
Catalogue sheet B1.282Hydraulic block cylinders Block cylinders, design with tube – double acting – max. operating pressure 250 bar
Catalogue sheet B1.590General characteristics of Hydraulic Equipment
Catalogue sheet A0.100Application examples
Application example 1
The shown hydro-cylinder B1.2811 is used for operation of a clamping plate in a special fixture for machining of aluminium parts.
hydro-cylinders B1.2811
Application example 2
Flexible riveting device for frames with hydraulic block cylinders B1.590
flexible riveting device for frames with hydraulic block cylinders B1.590
Application example 3: Injection mould
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
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
injection mould with hydro cylinder B1.282
Application example 4: Injection mould
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
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
injection mould with hydro-cylinder with stroke end cushioning B1.282
