In both types, a piston reciprocates inside a cylinder with internal ports giving the back & forth motion without the need for special valve arrangements.
Impacting models have metal-to-metal contact at each end of the piston stroke, which can be noisy and increas stress on the hopper wall. Continuous impact models are also available with a small air cushion to limit the noise to some degree but this also limits the force output. These models can be adjusted for frequency but by their nature cannot be adjusted for amplitude.
Single impact models use a piston held against a spring by air pressure. On release of this pressure the spring impacts against a strike plate.
Pneumatic Linear Vibrators - NTP Series
Nominal frequency from 1,328 min-1 to 8,784 min-1
Centrifugal force from 190 N to 2,039 N
Available in ATEX compliant or in stainless steel
Frequency and amplitude are adjustable separately
Applications The pneumatic piston vibrators series NTP are especially suitable for knocking off material adhering to container walls in funnels, containers, silos and hoppers. They can be used as drives for vibrating tables and chutes and as assistance for emptying containers. Special features of NTP vibrators are: impacts like a rubber hammer or vibration with high peak acceleration.
Design and functioning principle The vibration (linear) is produced by a freely vibrating differential pressure piston. In the standard version B+C the piston is knocking against an elastomer impact plate and works like a rubber hammer. In the version B without impact plate the piston works against an air cushion (noise reduced). The frequency can be adjusted by varying the pressure of the air supply and the amplitude by throttling the exhaust.
For operation a control valve is required (not included in scope of delivery). Lubrication-free operation is possible in compliance with the recommendations of Netter. ATEX compliant linear vibrators of the NTP series and units with stainless steel housing are available.
Permissible operating conditions Drive medium: Compressed air or nitrogen (Filter ≤ 5 µm), preferably with oil mist
Operating pressure: 200kPa to 600kPa
Amvbient temperature: 5°C to 60°C
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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.