Hybrid electric rotary unions for pneumatics, hydraulics & fluids
Combined media feed-through and power and signal transmission
Technical Specifications
Protection class
IP51 (higher on request)
Rated Current
2-10A per ring
Housing material
Aluminium, Stainless steel
Number of rings
2-96
Rotational speed
0-300 rpm
Additional services
Different media connection types
Electrical Specifications
- Number of rings: 2-96
- Nominal current: 2-10A per ring
- Max. operating voltage: 220/440 VAC/DC
- Dielectric strength: ≥500V @50Hz
- Electrical noise: max 10mΩ
- Insulation resistance: 1000 MΩ @ 500 VDC
2D drawing
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Catalogue
All details about our slip rings clearly arranged in the catalogue
Product selection Pneumatic liquid slip rings
Artikelnummer | Mediendurchführung | Anzahl Ringe Signal | Anzahl Ringe Power | Ringe insgesamt |
|---|---|---|---|---|
| 1 x G1/8 | 6 x 5A | - | 6 | |
| 1 x G1/8 | 18 x 5A | - | 18 | |
| 1 x G1/8 | 12 x 5A | - | 12 | |
| 1 x G1/8 | 4 x 5A | 2 x 10A | 6 | |
| 1 x G1/8 | 10 x 5A | 2 x 10A | 12 | |
| 1 x G1/8 | 16 x 5A | 2 x 10A | 18 | |
| 1 x G1/8 | 9 x 5A | 3 x 10A | 12 | |
| 1 x G1/8 | 2 x 5A | 4 x 10A | 6 | |
| 1 x G1/8 | 14 x 5A | 4 x 10A | 18 | |
| 1 x G1/8 | 24 x 5A | 4 x 10A | 28 |
One for all: pneumatic liquid slip rings
If you are looking for an all-rounder among the slip rings, then you are well advised to choose our pneumatic liquid series. These slip rings offer you a 360° feed-through for all forms of media and energy that exist: Power current, signal current, pneumatics and hydraulics all find room in these compact but powerful slip rings. This gives you maximum design freedom in the smallest space for your applications.
Hybrid Tire/Liquid + Electric
Different housing materials to choose from
Various connection sizes for media feed-throughs
Radial bores for media connections in the stato
Axial bores for media connections in the rotor
What do pneumatic liquid slip rings do?
Pneumatic liquid slip rings belong to the “hybrid slip rings”. They are designed for the passage of more than one form of energy. The pneumatic liquid slip rings are among the most powerful representatives of their class. Their task is to guide any incoming energy form through a rotating union that can be rotated as desired – or vice versa. The return line from a rotating duct into a rigid duct is also possible without any problems. The pneumatic liquid slip rings perform enormously, especially when passing through hydraulic or pneumatic pressures: the components can be pressurised with up to 100 bar. This makes them ideal for particularly demanding applications.
Functionality of the pneumatic liquid slip ring
The pneumatic liquid slip ring can conduct electrical current, gas pressure and even hydraulic pressure. The electrical feed-through does not differ from the design used in any other slip ring. Corrosion-resistant silver-silver or gold-gold contacts are designed as rings and brushes. The rings and brushes are mounted so that they can rotate relative to each other. Each ring-brush connection is assigned a pair of cables, which are colour-coded in the same way. This makes assignment particularly easy during installation.
However, transmitting gas pressure or hydraulic pressure through a rotary joint is an enormous challenge. A complex channel system is installed between the rotor and the stator to convey the media. In addition, a central media line ends in a rotary coupling. The weak point in this design is the seal. However, by using high-quality sealing rubbers and sophisticated engineering, these lines can withstand up to 100 bar – at 300 revolutions per minute!
Special design difficulties with pneumatic liquid slip rings
This highest design stage of the hybrid slip rings has to cope with further difficulties in addition to the pure passage of the gas and liquid flows. The rotation of inner and outer housing creates constant friction. With purely electronic slip rings, this is not much of a problem. But where absolute tightness is required, rubbing rubber rings on plastic or aluminium are a limiting factor for the service life of the component. Nevertheless, the rotarX series has succeeded in guaranteeing these slip rings a service life of 10 million revolutions or more. In addition, the separation of all media-carrying lines is a major design challenge. rotarX was also able to solve this task with the pneumatic liquid slip rings.
Advantages of pneumatic liquid slip rings
Pneumatic liquid slip rings offer users the following advantages:
-
- High load capacity
- Long service life
- Easy installation
- Reliable, sophisticated design
- Compact construction
- Versatile application.
10 million revolutions at 300 revolutions and 100 bar pressure are a real statement. The robust, tested and highly resilient pneumatic liquid slip rings can withstand even the most demanding environments. And they are more than easy to install: the housing can be attached to any suitable component using standard screws. The connections for the media feed-throughs are standardised and can be connected using conventional tools. Once installed, the rotary feed-throughs perform their task reliably. As they can transmit virtually all relevant forms of energy with a single component, they are particularly space-saving. The possibilities for their use are correspondingly vast.
Product variety of pneumatic liquid slip rings
In terms of electrical feed-through, the pneumatic liquid slip rings offer a selection of two to 96 rings. Each ring can handle a rated current of 2 to 10 amps. A working voltage of 220 volts AC or 440 volts DC is permissible. Each ring can withstand voltage peaks of up to 500 volts at 50 hertz. The maximum electrical noise is a negligible 10 milliohms. The insulation resistance of the pneumatic liquid slip rings is 1000 megaohms at 500 volts DC.
For pneumatic and/or hydraulic systems, there are up to 16 feed-throughs to choose from. The rotational speed is limited to 300 revolutions per minute. However, this is completely sufficient for most applications. The slip ring housing is made of stainless aluminium. The electrical part is designed for protection class IP51. The mechanical part is, of course, capable of withstanding much higher loads. The pneumatic-liquid slip rings have a temperature range of -30 °C to + 80 °C. They can be subjected to pressures of up to 100 bar.
Use of the pneumatic liquid slip rings
The media guides of our pneumatic liquid slip rings are not exclusive. This means that we can convey both liquids and compressed gas in this series. This enables very interesting combinations. In addition to the transmission of pneumatic or hydraulic energy, it is also possible to convey auxiliary and operating materials, such as coolants, cleaning agents or lubricants. The possible applications are therefore practically unlimited. However, these powerful slip rings are particularly popular in construction vehicles. Above all, wheeled and tracked excavators with rotating upper carriages and hydraulic propulsion have at least one hydroelectric conduit in the chassis. This allows the motor and hydraulic unit to be conveniently housed in the rotating upper carriage while still reliably supplying the chassis’s rotary motors with hydraulic pressure. Another application for these particularly powerful slip rings is in wind turbines. Here, they are mainly used for the hydraulic control of the rotor blade adjustment. They can transmit sensor data or luminous flux simultaneously with hydraulic pressure, which is used to optimally turn the rotor blades into the wind.
Maintenance of the pneumatic liquid slip rings
Unlike the particularly small and very inexpensive electric slip rings, the pneumatic liquid slip rings allow a certain amount of maintenance. They can be dismantled and thus, for example, release the sealing rings for replacement. Nevertheless, the components should be checked carefully before each recommissioning: As long as only contacts and sealing rings are worn, the pneumatic liquid slip rings can be reconditioned without any problems. However, if the channels have nicks, scratches and cracks, their replacement is recommended. To prevent this as much as possible, we recommend keeping them as particle-free as possible by means of a filter before each media passage – including compressed air or gases.
How to get your pneumatic liquid slip ring
Pneumatic liquid slip rings are components for demanding applications. If you are unsure which slip ring is best suited to your applications, please contact us. Call us on our hotline or send us a message. You can use our contact form or simply send us an email. Drawings or photos will help our service team to get a clear picture of your challenge. We will then work with you to develop the optimal strategy for your pneumatic liquid slip rings.
Practical slip ring solutions for your application
Product catalogue for all slip rings
Find out about the different slip rings in our current overview. Transmission technology for complex industrial and safety-relevant applications form the core of our product range. All products can be individually adapted to the applications in order to offer you added value. Premium engineering - that is our claim for every single product we manufacture. We would like to convince you of this.
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