The Hänchen Ratio-Clamp® keeps the position for you. This device is a positive rod clamping safety device. The Ratio-Clamp is unlocked by hydraulic pressure. In the event of an electrical/hydraulic power loss, the potential energy of the internal Bellville washers load a conical piston, driving it over the friction fingers resulting in securing the load. “A true self contained safety clamp.”
Wherever power failures or malfunctions pose a risk to the safety of people or machinery, the rod locking device is there to save the day. It is also useful to accurately hold the cylinder rod in an exact position without the need to keep hydraulic pressure on the cylinder, thereby saving energy while maintaining accuracy. It clamps down and fixes the piston rod right where it is with no additional power needed.
Guaranteed advantages of hydraulic rod locks
No axial rod movement during clamping and releasing
Protective clamping effect in case of a power failure
Load capacity that is independent of direction
Clamps completely surrounding rods
IoT 4.0 Compatible: Integrated sensors to know if the clamp is locked or unlocked
Boasting a retention force of up to 101,000 lbf., the clamp hydraulically holds the piston rod in whatever position it is in at that particular moment without having to generate extra power (no extra energy) for an unlimited period of time. The clamping device Ratio-Clamp is approved by the German Technical Inspection Agency (TÜV).
Special development of Custom solutions (larger rod diameters, intermediate size, greater clamping forces) pose no problem for the Hänchen specialists. Hänchen is particularly proud of its RC-H model. Following a request from the Health and Safety Centre of the Employers’ Liability Association (BGZ iron and metal section III, Düsseldorf), Hänchen developed the new safety clamping hydraulic Ratio-Clamp under extreme conditions for use with hydraulic presses and injection molding machines.
Ratio-Clamp Applications
Testing technology in aviation: The setups for aviation tests have been refined to the last detail. Cylinders are used in different fields of testing, simulating ambient conditions and loads during different flight phases. The Ratio-Clamp® is used to protect the intricately constructed and expensive systems.
Production in molding and injection presses: Clamping units ensure safety during the pressing process in molding and injection presses for the production of synthetic and rubber molder parts in accordance with EN 289.
Maintenance in railway technology: During maintenance, trains must be fixed in a raised state. The Ratio-Clamp® is ideally suited for this purpose, as it holds the train securely in position until the work had been completed.
Production in grinding machines: During the production process of ICE rail sleepers, extremely large and heavy concrete workpieces must be positioned for grinding safely and with an accuracy of 0.01 mm. Hänchen’s hydraulic cylinders and Ratio- Clamp® clamping units are designed exactly for these requirements.
Production in profilling machines: Hänchen clamping units ensure precise machining and consistent quality in the production of metal profiles. During the production process, they facilitate the machining of the profiles by locking the forming tools in place. Ecological and efficient, purely with spring power.
Hänchen is a supplier and hydraulic cylinder manufacturer for various applications including construction, mechanical, technological, and industrial.
Everyone who has heard of Hänchen is aware that its worldwide reputation is based on hydraulic cylinder solutions that are anything but standardized. The standardization actually deals with nothing more than basic dimensions and connections, mounting, parts, etc. Indeed for the common solution, a standard cylinder will often do the job without any problems. In many demanding applications it is possible to use a standard Hänchen cylinder due to the high quality levels they attain. In principle, they make exclusive use of honed cylinder tubes for all their cylinders. Hänchen also guarantees that all the cylinders in its product range, as well as normalized cylinders, comply with the most exacting of geometrical accuracies. Hans Holland Hydraulik offers a standard range with particularly cost-effective solutions. Whether you require newly-manufactured components or the additional machining of existing items, you can be sure their production facilities will meet your individual needs. Hans Holland Hydraulik also offers you preservation and color treatments. Also short delivery times, even of large batches of items, are no problem. Their standard cylinders often require only simple modifications to fulfill a wide range of applications, without the greater expense of full customization.
Hänchen is a supplier and hydraulic cylinder manufacturer for various applications including construction, mechanical, technological, and industrial.
Specialty cylinders are offered by Hänchen. Hänchen has renown for top quality hydraulic cylinders for many years with one of the largest testing range in the market, offering lightweight servo actuators for static applications or high frequency cylinders for dynamic testing:
Advantages at a Glance:
Single or double-rod cylinders
Up to 320 bar/4,600 psi
Modular system for efficient change of applications
Integrated position transduced, per your specifications
Optional mounting plate for control valve
Optimal price-performance ratio
Servo valve, sensor, and control software agnostic – we work with all brands
Easy serviceability and spare parts available
Which series is right for my application?
Servo cylinders of the Series 120 and 300 are light-duty test actuators for simple testing tasks. For more challenging tasks, the Series 320 is a hydrostatic design offering excellent precision and high performance, allowing for high lateral forces and speeds.
General Specifications:
Bore, mm (in): 25-200 (0.98-7.87)
Force, kN (lbf): up to 1,568 (up to 352.5)
Stroke, mm (in): 1-1,500 (0.04-59.06)
Frequency (Hz): up to 100+, limited by servo valve
The 320 Series: Constructed for highly dynamic tests
Perfect for industrial applications, structure tests, and load simulations: the Series 320 test cylinder is the best choice for challenging tasks. It performs well, for example, in checking the functional safety of systems, component parts, or products; for structural testing of airplanes, refrigeration compressors, automobile exhaust system; or for simulating loads and movement, such as operational profiles and flight profiles.
The Series 320 is built from a solid block of steel. This means that any part of the cylinder can be customized to your requirements unlike standard models with limited sizing options. Rigid construction of the cylinder means means no leakage, a long service life, and good data.
4 Stand Out Features of the 320 Series:
Bores adjustable to the millimeter: The working areas can be designed individually for the respective requirements, saving acquisition and operating costs for the required periphery, and increasing energy efficiency.
Protection against unforeseen movement: Emergency cushion adds protection for the cylinder and test specimen. This is included in the stroke as standard. The effective stroke is between the two emergency cushioning.
Operation without a leak oil pump: Thanks to elaborate sealing and guiding system, cylinders don’t need leak oil pumps. The cylinders are equipped with high-quality bronze coatings for optimum emergency running properties.
Modular system efficient change of applications: Mounting parts and accessories fit cylinders with different forces and do not have to be purchased several times for one test field.
Hänchen is a supplier and hydraulic cylinder manufacturer for various applications including construction, mechanical, technological, and industrial.
Stick-Slip in Hydraulic Cylinders
Our Hydrostatic Design
How are Test Cylinders Used?
Automotive
Servo hydraulic lifecycle tests are the current industry standard for automobile components that are used far beyond safety-related structural elements. Users can depend on hydraulic test actuators for high positioning accuracy and reliability in applications for test systems and real time control. A test cylinder with a dynamic lift of up to 35 mm (1.3 in.), speed of 1.3 m/s (51.2 in/s), and acceleration of up to 50 m/s (1968.5 in/s) could be used for a test load requiring up to 28 kN (6,294 lbf) and a frequency up to 20 Hz.
Aerospace
System tests that simulate loads and environmental conditions in different flight phases are particularly demanding. To test the landing flaps and slats, servo hydraulic cylinders could be used here to replicate the airflow that involves rapidly changing forces with irregular parameters. For example, a servo cylinder with a bore between 40 to 160 mm (1.5 to 6.2 in.) could be used for a test stand with a holding force between 140 – 300 kN (31.4 to 67.4 lbf) and a stroke requirement of 300 to 1,670 mm (11.8 to 65.7 in.).
Fluid Power
To determine the characteristic values of a seal, seal test benches are suitable for simulating a wide range of operating conditions. Double rod cylinders could be used here for fatigue tests focused on examining the frictional force of the seals, tightness on rods and shafts.
Choosing a Testing Cylinder
Dynamic Movement
First, determine if the cylinder will be used in highly dynamic applications, such as torque/torsion testing of axial loads and other drive line components. If so, seal protection is important to have, along with a servo valve that can be mounted to the actuator to offer more control to the device. It is important to know the application including the speed, pressure, loads, and any forces acting on the cylinder.
Frequency
What frequency will your cylinder require? Industrial applications and dynamic testing typically have higher frequency ranges, with some frequencies greater than 100 Hz.
Seals
It’s important to pay attention to the conditions your cylinder will be in. Conducting tests in conditions like salt spray fog, in climate chambers, or in a lab require individualized protection. Seal factors to pay attention to include temperature ranges, types of movement (simple, sensitive, controlled), outdoor stress, stick resistance, and type of medium, etc.
Load Holding
If loads need to be held in position for extended times, a rod lock can be included which allows a load to be held in a precise position and without power/pressure being applied.
In addition to their standard cylinder range, custom cylinders are offered by both Hans Holland and Hänchen. IC-Fluid Power also has other sources to make any cylinder you can imagine. Simple or complex, large or small bore, long or short length, fast or slow…the possibilities are endless. Our engineers are available to help with your specialty cylinder application. Contact us today for more information.
Hans Holland and Hänchen are suppliers and custom cylinder manufacturers for various applications including construction, mechanical, marine, and industrial.
