In the former model a ball is rotated by air pressure around the inside of a hardened steel race to give an out of balance force. The speed of rotation and the force output are varied by changing the inlet air pressure. This principle also applies to the roller type. In the turbine, an out-of-balance turbine is held in bearings while being rotated. In this case there is no metal to metal contact which gives a much quieter operation with no lubrication required.
Again, varying the air inlet pressure will change the frequency and force.
Pneumatic External Vibrators - NVR, NVG, NVT & NQT Series
Nominal frequency from 8,500 min-1 to 17,000 m in-1
Centrifugal force from 7,130 N to 62,260 N
Frequency infinitely variable by air pressure
Easily and quickly removable
Noise reduced design NQT
Application The pneumatic external vibrators series NQT, NVG, NVR und NVT are especially suitable for compacting, conveying and loosening bulk material. They are used to compact concrete, empty bins and as drives for conveyors, sieves and vibrating tables. A special feature is the ruggedness against strong varying loads. There is no danger of overload.
Design and functioning principle The vibration (circular) is produced by eccentric rotating rotors. The frequency and the centrifugal force are continuously adjustable by the operating pressure. For operation a control valve is required (not included in scope of delivery).
Permissible operating conditions Drive medium: Compressed air or nitrogen (Filter ≤ 5 μm), preferably with oil mist.
Operating pressure: 100 kPa to 700 kPa
Ambient temperature: –10ºC to +60ºC
Units for other temperatures are available.
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Vibration Systems & Solutions | Flow Aid Solutions
For over 40 years we have supplied flow aid solutions to keep product moving from hoppers, bins and chutes. Whether pneumatic rotary, pneumatic linear or electric rotary, the right vibrators, mounted correctly, will give just the right force to move your product smoothly and effectively. Damage to bins is eliminated and a continuous flow of product is assured. Nothing is added to your product stream, as in the case with air injection devices.
Operator "damage" is eliminated with no more hammer swinging, and noise is down to acceptable levels with most vibrators, usually far lower than noise levels of other flow promoting devices.
Vibrator mounting is non-invasive and doesn't require the cutting of your bins, with the subsequent clean up costs and risk of product contamination. There is no need for installation technicians to enter the hopper. Vibrators can often, depending upon the product, be installed without any interruption to your process.
Many types of vibrators are also used as drives for vibrating feeders and vibrating tables, especially pneumatic linear models which have very good control features.