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 Ball Vibrators - NCB Series
Nominal frequency from 7,220 min-1 to 42,340 min-1
Centrifugal force from 220 N to 4,866 N
Frequency continuously adjustable via air pressure
Suitable for temperatures up to 200ºC (HT Models)
Applications Series NCB pneumatic ball vibrators can be used wherever bulk materials need to be moved. They serve in the emptying of bunkers, for preventing bridging, rat-holing and adhesion. When used to drive chutes, sieves and vibrating tables, they ensure that the material flow is maintained. The special feature is the simple construction.
Construction and Working Principle The rotary vibration is created by the high centrifugal force produced by a circulating steel ball, which runs on hardened, polished steel races. The frequency, and hence the centrifugal force, can be continuously regulated via the operating pressure. Series NCB ball vibrators can be operated using lubrication-free compressed air.
A multi-directional valve is required for operation (not included in the scope of supply).
Permissible Operating Conditions Drive medium: Compressed air or nitrogen (filter ≤ 5 μm), preferably with oil mist
Operating pressure: 200 kPa to 600 kPa
Ambient temperature: – 20ºC to +120ºC
HT version up to +200ºC
For more information on Pneumatic Ball Vibrators - NCB Series, please click here.
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.