The Hänchen Ratio-Clamp® 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.” 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. The Hänchen Rod Clamping Device meets the OSHA CFR 1910.217(d)(9)(iv) and ANSI B11.1-2001 standards for preventing the movement of the dies when adjustments and repairs are preformed or when humans are under the dies. This is an excellent alternative to safety blocks as it allows the flexibility to hold the die anywhere in its stroke and also immediately stops and holds the dies for an emergency or power loss.
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:
Compensating valves integrated in the piston
Metering cylinders
Three-position cylinders
Rapid force/speed cylinders
High speed cylinders (up to 40 m/s)
Multi-position cylinders
Plunger cylinders
Control and servo-cylinders
Synchronous cylinders
Tandem cylinders
Telescopic cylinders
Cooling jacket cylinders
Hollow piston cylinders
Oscillation (fatigue rated) cylinders
Locking and tensioning cylinders
Hänchen is a supplier and hydraulic cylinder manufacturer for various applications including construction, mechanical, technological, and industrial.
What are Test Cylinders?
Test cylinders are used extensively in the testing sector and can be used for checking the functional safety of systems, component parts or products, for structural testing of airplanes, refrigeration compressors, automobile exhaust systems, or for simulating loads and movements, such as operational profiles and flight profiles.
Advantages
High speeds and lateral forces up to 4 m/s (157 in/s)
High stability and rigidity, as the entire cylinder body is machined from one solid block of steel (in 320 series)
Compact design and more force in a smaller space compared to electric actuators
No leak oil pump 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.
