Advantages of test hydraulic actuators:
  • short changeover times
  • adjustable working areas for cost reduction
  • compact servo hydraulic cylinder construction
  • efficient for varying test series
  • high stability and rigidity
  • high speeds and lateral forces

Hydraulic test actuators series 320
Test hydraulic actuators with special features

Efficient with varying test setups, compact, versatile, quick, sensitive and robust – the best choice for challenging tasks.

Perfect for highly dynamic industry and test tasks

  • Industrial applications – from friction welding and ingot oscillation to compacting sintered metal
  • Checking the functional safety of systems, component parts or products
  • Structure test of aircraft, automobile exhaust systems, refrigerating compressors and many more
  • Load and movement simulation, e.g. operational profiles and flight profiles
Perfect for highly dynamic industry and test tasks
For every frequency range and for high lateral forces

The test actuators convince with their stability and high inherent stiffness. They are suitable for high speeds and can reliably bear high lateral forces.

Modular system for efficient change of applications

Mounting parts und accessories such as spherical rod eyes, integrated position trans- ducers, force transducers, mounting plates, accumulators or control valves fit cylinders with different forces and do not have to be purchased several times for one test field.

Operation without leak oil pump

Thanks to the elaborate sealing and guiding system, Hänchen cylinders don't need leak oil pumps.

Hänchen Series 320 actuators for test applications are equipped with high-quality bronze coatings for optimum emergency running properties. Unlike other hydraulic test actuator manufacturers and the earlier PL and PLF hydropulse actuators from Schenck.

Protection against unforeseen movement

The emergency cushion serves for self-protection of the cylinder and test specimen, and is included in the stroke as standard. The effective stroke is between the two emergency cushioning.

Every test cylinder of the series 320 is equipped with a safety damper before each end position
Bores adjustable to the millimetre

The working areas can be designed individually for the respective requirements. This saves acquisition and operating costs for the required periphery and increases the energy efficiency, e.g. with regard to the system's energy input and cooling power.

Hänchen servo hydraulic actuator
Test actuators exactly as they should be. Perfect.

Which cylinder design is the right one for your requirements? The performance map serves for orientation purposes and describes the dynamic movement of a hydraulic drive during a sinusoidal oscillation. The performance classes of the different cylinder designs define the possible applications.

In typical Hänchen quality – high quality honed surfaces, components with geometrical accuracy, and coordinated sealing elements – these servo cylinderds fulfil highest technical requirements for safe and reliably controlled drives.

Use our HÄKO product configurator to help you design and calculate the right hydraulic cylinder or test cylinder.

 

Examples for
performance map
     
  Series 120, 300
Single-rod
Series 120, 300
Double-rod
 Series 320
Double-rod
Frequency (Hz) 2 20 70
Amplitude (mm) 16 4 2,3
Speed (m/s) 0,2 0,5 1
Acceleration (m/s2) 3 63 440

Limit values in the performance map without accounting for construction restrictions such as port size, sealing system, guiding system or control valve.

Lateral force design
Design characteristics of series 320 test actuators

Especially important for designing servo actuators for test systems:
Taking into account the lateral forces acting on the piston rod, and a cushioning to protect the cylinder.

 

Design according to the lateral forces
Lateral forces on the piston rod

The amount of permitted lateral forces is mainly determined by the rod diameter, the guiding system and the cylinder stroke. This results in different values per stroke position. The permitted lateral force in the retracted end position is therefore always greater than in the extended position. For cylinders with longer strokes, the selection of the sealing and guiding systems are of little consequence in regard to resistance to lateral forces.

Admissible cantilever forces

  

For the exact lateral force curves for every dimension, please use our Hänchen configurator HÄKO at >> Test cylinders >> Equipment

Transverse forces on the piston rod

Cover design of servo hydraulic test cylinders
Sealing and guiding system in the cover

A dynamic test environment requires freemoving, low stick-slip hydraulic cylinders. Hänchen offers three test actuator designs with especially low friction. High production accuracy with very little guide clearance guarantees wear-free use and thus a long service life. You'll find further information on the design of the pistons sealing system here.

Servoseal® design
with H-CFRP® retaining ring to avoid functional oil

Servoseal® is a dynamically sealing synthetic ring. The integrated retaining ring made of H-CFRP® prevents excessive pressure build-up on the sealing surface due to hydraulic pressure. Even at small amplitudes, no wear and no scoring is produced on the counterfaces due to deficient lubrication.

Servoseal design
Guiding system cover PTFE wear rings
= contact guiding element
Sealing system of the cover Servoseal®, lip seal, wiper ring
Operating limits

Speed:                2 m/s
Temperature:       80 °C
Friction:               pressure-independent



Servofloat®-design
with patented floating gap seal for extremely low friction

In the Servofloat® sealing element, the pressure in the cylinder chamber is discharged to the outside through a narrow no-contact throttle gap. The ring centres itself on the piston rod and seals without contact. This system requires no external pressure supply.

In the Servofloat® seal element the pressure in the cylinder chamber is discharged to the outside in a contact-free through a narrow no-contact throttle gap.

 

Guiding system cover PTFE wear rings
= contact guiding element
Sealing system cover Floating gap seal, functional oil
seal, wiper ring
Operating limits

Speed:                4 m/s
Temperature:       100 °C
Friction:              none



Servobear®-design
with hydrostatic piston rod guide for highest side loads

The hydrostatic bearing Servobear® combines seal and rod guide. The rod is "floating" on an oil film without touching the guide. The pressure is released through this narrow bearing gap. The pressure supply for the hydrostatic bearing is realised internally via the system pressure.

Unlike the earlier PL and PLF hydropulse cylinders from Schenck, we do not use maintenance-prone capillary tubes in front of the bearing pockets, but use components from aviation technology.

Servobear® combines seal and rod guide. The rod is "floating" on an oil film without touching the guide. The pressure is released through this narrow bearing gap.

 

Guiding system in cover
Hydrostatic bearing
= no-contact guiding elements
Sealing system on the cover
Functional oil seal,
wiper ring
Operating limits

Speed:                4 m/s
Temperature:       100 °C
Friction:               none

Hydraulics design
Flow rate and emergency cushion

The gap seals used in the test cylinder must be observed when designing the necessary flow rate. The penetrating oil flow in the cover is the one required for the Servofloat® and Servobear® design. On the other hand, a leakage occurs at the piston in the "fitted piston" design. This additionally required oil must be added to the flow rate required for the operation of the test cylinder.

 

Flow rate
Functional oil flow in covers

The Servoseal® sealing system or gap seals are used on the cover or piston for highly friction-sensitive applications with small amplitudes. Servoseal® generates very little leakage, which is hardly measurable during operation. This enables very high hydraulic efficiencies to be achieved.

 

 

Functional oil flow in covers

 











  Servocop®, Servoseal®
  Servofloat®
  Servobear®
Reference values apply to 210 bar chamber pressure [working pressure], for Servobear® 280 bar supply pressure [system pressure], fluid ISO VG 46 at 55°C

Flow rate
Diagram of leakage oil on piston

Gap seals operate with a functional oil flow which is discharged into the tank without pressure via the leak oil port. It must not be sucked off.

 

 

Diagram of leakage oil on piston











  Rectangular compact seal, Servoseal®
  Gap seal
Reference values apply to 210 bar differential pressure at the piston,
fluid ISO VG 46 at 55°C

 

The new sealing system with retaining ring made of H-CFRP® is a good example of how CFRP materials can lead to new design approaches. In appropriate applications, H-CFRP® also makes it possible to downsize the cylinder and the entire drive system, as the Servoseal® cylinder operates more efficiently.
Dr. Michael Döppert, Editor-in-Chief of "Der Konstrukteur"

Technical data of test cylinders
Series 320

According to rod diameter

Type of effect: double-rod cylinder | Sealing systems: Servoseal®, Servofloat®, functional oil seal (Servobear®) | Speeds: up to 4 m/s
Rod Ø
(mm)
Type

Bore
(mm)
Force (kN)
210 bar
Force (kN)
320 bar
Stroke
(mm)
25 strong 28 –   45  2,6 – 23,1  4,0 – 35,2  50 – 170
30 strong 34 –   55  4,2 – 35,0  6,4 – 53,4  50 – 220
40 strong 45 –   70 7,0 – 54,4  10,7 – 82,9  50 – 270
50 strong 56 –   80 10,5 – 64,3 16,0 – 98,0  50 – 450
63 strong 70 – 110 15,4 – 134  23,4 – 204 50 – 450
80 slim 90 – 120 28,0 – 132 42,7 – 201  50 – 450
80 strong 90 – 150 28,0 – 266 42,7 – 405  50 – 450
100 slim 110 – 150 34,6 – 206  52,8 – 314  50 – 450
100 strong 110 – 175 34,6 – 340  52,8 – 518  50 – 450
125 slim 140 – 175 65,6 – 247 100 – 377  50 – 450
125 strong 140 – 200 65,6 – 402 100 – 613  50 – 450
160 slim 180 – 220 112 – 376  171 – 573  50 – 450
160 strong 200 – 260 238 – 693  362 – 1.056  50 – 450
200 slim 240 – 280 290 – 633  442 – 965  50 – 450
200 strong 250 – 320 371 – 1.029  566 – 1.568  50 – 350

strong: massive construction (e.g. vertical installation)
slim: lighter construction (e.g. horizontal installation with spherical rod eyes)






Test hydraulic actuator with variable piston diameter
According to nominal force
Nominal force
(kN)
Design

Rod Ø
(mm)
Bore
(mm)
Force
(kN)
210 bar
    Lateral force when extended
(kN)
stroke 100** | stroke 250**  
Servoseal®  Servofloat®   Servobear®  
4    light rod  
normal rod  
25
30
30
34
4.5
4.2
  0.31
0.51
      0.27
0.44
      0.51
1.0  
     
6.3 light rod  
normal rod  
30
40
36
45
6.5
7.0
  0.51
1.6  

|

0.57
  0.44
1.5  

|

0.54
  1.0  
2.5  

|

0.67
 
10   light rod  
normal rod*
30
40
39
47
10.2
10.0
  0.51
1.6  

|

0.57
  0.44
1.5  

|

0.54
  1.0  
2.5  
 
|

0.67
 
16   light rod  
normal rod*
reinforced rod  
30
40
50
44
51
59
17.1
16.5
16.2
  0.51
1.6  
2.8  

|
|

0.57
1.6  
  0.44
1.5  
2.4  

|
|

0.54
1.2  
  1.0  
2.5  
4.6  
 
|
|

0.67
1.2  
 
25   light rod*
normal rod  
reinforced rod  
40
50
63
56
64
74
25.3
26.3
24.9
  1.6  
2.8  
3.8  
|
|
|
0.57
1.6  
3.2  
  1.5  
2.4  
3.6  
|
|
|
0.54
1.2  
2.9  
  2.5  
4.6  
7.8  
|
|
|
0.67
1.2  
2.3  
 
40   light rod  
normal rod*
reinforced rod  
40
50
63
64
70
80
41.2
39.6
40.1
  1.6  
2.8  
3.8  
|
|
|
0.57
1.6  
3.2  
  1.5  
2.4  
3.6  
|
|
|
0.54
1.2  
2.9  
  2.5  
4.6  
7.8  
|
|
|
0.67
1.2  
2.3  
 
63   light rod*
normal rod  
reinforced rod  
50
63
80
80
88
101
64.3
62.3
62.7
  2.8  
3.8  
6.7  
|
|
|
1.6  
3.2  
4.5  
  2.4  
3.6  
6.4  
|
|
|
1.2  
2.9  
5.1  
  4.6  
7.8  
13.3  
 |
|
|
1.2  
2.3  
4.4  
 
100   light rod  
normal rod*
reinforced rod  
63
80
100
100
112
127
99.5
101.3
101.1
  3.8  
6.7  
11.1  
|
|
|
3.2  
4.5  
9.7  
  3.6  
6.4  
10.3  
|
|
|
2.9  
5.1  
8.7  
  7.8  
13.3  
24.9  
|
|
|
2.3  
4.4  
9.7  
 
160   light rod*
normal rod  
reinforced rod  
80
100
125
127
140
160
160.5
158.3
164.5
  6.7  
11.0  
16.2  
|
|
|
4.5  
9.7  
15.9  
  6.4  
10.3  
15.1  
|
|
|
5.1  
8.7  
14.6  
  13.3  
24.9  
49.5  
|
|
|
4.4  
9.7  
23.9  
 
250   light rod  
normal rod*
reinforced rod  
100
125
160
160
175
202
257.3
247.4
250.8
  11.0  
16.2  
24.7  
|
|
|
9.7  
15.9  
24.0  
  10.3  
15.1  
22.1  
|
|
|
8.7  
14.9  
22.7  
  24.9  
49.5  
81.6  
 |
|
|
9.7  
23.9  
42.2  
 
400   light rod*
normal rod  
reinforced rod  
125
160
200
200
225
225
402.0
412.7
412.7
  16.2  
24.7  
31.7  
|
|
|
15.9  
24.0  
30.6  
  15.1  
22.1  

|
|
|
14.6  
22.7  

  49.5  
81.6  
99.1  
 |
|
|
23.9  
42.2  
58.4  
 
630   normal rod*
reinforced rod  
160
200
225
280
650.3
633.3
  24.7  
31.7  
|
|
24.0  
30.6  
  22.1   |
|
22.7     81.6  
99.1  
 |
|
42.4  
58.4  
 
1.000   normal rod* 200 320 1,029.2   31.7   | 30.6       |     99.1    | 58.4    


The assignment of the piston to the nominal force serves for orientation purposes. For optimised design under consideration of hydraulics, dynamics or weight, please use the calculation in our product configurator HÄKO.

* Reference to common standard dimensions such as the Schenck actuators.

** The mechanical guiding systems of Servoseal® and Servofloat® are limited by the permissible surface pressure, but can absorb very high lateral forces and deflections during long strokes. Hydrostatic bearings (Servobear®) are characterised by a very high bearing and lateral load capacity, especially with short strokes.

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