S-Type / Hydraulic Heavy-Duty Buffers for Industry
Gas-Hydraulic Heavy-Duty Buffers / S-Type / COMPENSER®
LEBEN develops and manufactures S-Series gas-hydraulic heavy-duty dampers and heavy-duty buffers for applications in medium- to heavy-duty mechanical engineering (heavy-duty). The hydraulic buffers absorb high impact energies in a controlled manner and limit the reaction forces acting on machines, equipment, and supporting structures. Custom designs available – get in touch.
The preferred area of application for the (gas-) hydraulic buffer (COMPENSER®) of the S-series is in the field of medium to heavy mechanical engineering. As a gas-hydraulic buffer, it is used in large crane systems (e.g., port cranes, shipyard cranes, or container cranes), metallurgical plants, rolling mills, loading systems, in railway technology, or as an end stop integrated into a buffer stop. Due to its modular design, maintenance and simple repairs on this hydraulic buffer can be carried out on-site by the customer’s own personnel.
Applications:
- Crane systems, bridge cranes, gantry cranes, and steel mill cranes
- Container cranes, port cranes, ship-to-shore cranes, and loading bridges
- Trolleys, crab trolleys, crane trolleys, and crane end stops
- Conveyor systems, conveying technology and bulk material handling
- Stacker-reclaimers
- Wagon tipplers and transfer cars
- Stacker cranes (ASRS), AS/RS systems, high rise storage facilities, and intralogistics
- Bumper stops, friction buffer stops, (hybrid buffer stops), fixed buffer stops, and track ends
- Automatic couplers, railway couplings, Scharfenberg couplings, and intermediate buffers
- Test benches, crash test facilities, end stops, and special-purpose machine engineering
- Mounting position: any
- high retracting force
- very high buckling resistance
- very robust guide and bearing
- Surface: housing painted in RAL 1023 (standard), piston rod double hard chrome-plated (standard)
- low and high viscosity COMPENSOL®
- Flange optionally on front or rear side, or foot mounting
- optionally constant reaction force over the entire stroke or increasing reaction force in the front stroke range
- very short activation time after impact
- Temperature range -40 to +80 °C
- Energy dissipation up to 3,450 kNm
The gas-filled inner tube 2 retracts into the outer tube 9. In the process, the damping medium flows from the working chamber 6 through the throttle bores 8 of the metering tube 7 into the compensation chamber 5. The separating piston 4 simultaneously moves towards the impact cap 1 and compresses the nitrogen gas filling. The energy required for resetting is thus stored in the gas chamber 3. When the inner tube 2 returns to its initial position, the separating piston 4 moves in the opposite direction, pushing the damping medium back into the working chamber 6.
Designations
1 impact cap
2 inner tube
3 gas chamber
4 separating piston
5 volume compensation chamber
6 working chamber
7 metering tube
8 throttle bores
9 outer tube
10 rear flange
- Tube-in-tube construction
- Installation tube for integrating the buffer into a concrete block (includes: mounting plate and thread for mounting the flange; optional: guide rod and crosshead; corrosion protection: hot-dip galvanized)
- Guide system with guide rod and crosshead / transverse yoke
- Anti-climber according to DIN EN 12663-1
- Additional accumulator to reduce the retracting force, e.g., for operation-related load cycles
- Sensor for signaling the operational readiness of the shock reducing element (inductive, magnetic, optical, or as a mechanical limit switch – also available explosion-proof according to ATEX)
- Pressure sensor (diaphragm/piston pressure switch) for monitoring the internal pressure
- Sensor for position monitoring of the stroke
- integrated temperature monitoring
- integrated monitoring of fill levels
- Maintenance connection for filling damping medium and nitrogen gas
- specific materials, e.g., stainless steel for highly corrosive environments or use in the food industry
- high-quality corrosion protection according to DIN EN ISO 12944 up to corrosivity category C5M
- Housing: painted (for example seawater-resistant or zinc-free) or nickel-plated. / Piston rod: bronze-hard chrome coating
- Bellows as optimal protection against dust, dirt or corrosive media
- leak-free use due to highly viscous COMPENSOL®
- safe use in automotive & food industry through appropriate COMPENSOL®
- Special COMPENSOL® for use in extreme temperature ranges
- Valve to minimize retraction time
- Drive energy consumption (throttling)
- End position damping
- optionally round or square flange on front or rear side
- Foot mounting (welded or flanged)
- Special mounting elements (for example eyes) according to the customer’s desired geometry
- Special impact cap upon customer request and for special applications (e.g., interlocking impact cap for two colliding impact caps)
- Safety wire rope on the piston rod
- Special seals for use in extreme temperature ranges
| Piston | Stroke Range [mm] | Max. Energy Capacity [kJ] | Max. Reaction Force* [kN] |
|---|---|---|---|
| S55 | 50–1.000 | 141 | 180 |
| S82 | 50–1.200 | 383 | 375 |
| S112 | 50–1.400 | 924 | 750 |
| S140 | 50–1.800 | 2.029 | 1.250 |
| S202 | 50–2.000 | 3.455 | 1.900 |
The maximum energy absorption applies to each maximum stroke listed. The actual reaction force and damping characteristic curve are individually optimized for mass, impact velocity, available stroke, number of dampers, and load cycles. Intermediate strokes and custom designs are available upon request.
- Long Strokes: For the S55, S82, and S112 models with strokes exceeding 400 mm, and for the S140 and S202 models with strokes exceeding 1,000 mm, the initial allowable reaction force* is less than the specified maximum value.
- Mounting: The SB rear flange version is recommended only for strokes up to 500 mm on the S55, S82, and S112 models; up to 400 mm on the S140; and up to 300 mm on the S202.
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