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Hoppers & Silos
Netter makes an impact
Pneumatic interval impactors alleviate the emptying of containers and
eliminate rat-holing and bridging
The standard application for pneumatic interval impactors is depending on the above factors. To achieve optimum results, the
knocking off stubborn residues from walls, pipes and containers. impactor should be mounted on weld-on consoles or brackets,
They are used mainly for cleaning out and emptying residues. using special fixing kits. The individual effective diameters
However, they are also a great help in the elimination of rat- should overlap each other in such a manner that the load is
holing and bridging. transferred evenly across the whole surface of the container. In
Vibrators are used in many areas of industry for maintaining addition to the weld-on consoles a series of selected accessories
product flow, conveying or compacting materials, sieving and is available for specific applications and to optimise or increase
dosing bulk material, distributing and sorting products and for the product-life of the impactor. Application technicians from
cleaning containers. NetterVibration will be pleased to assist you with the selection
But what goes on when residues have to be emptied, of the correct impactor, with the aid of free test devices.
particularly when extremely adherent materials are involved? The impactors can be switched on and off manually, by means
There are several possibilities for solving this type of problem. of solenoid valves or duty-pause controls. The knocker is
One of the most efficient is the use of a pneumatic interval charged as soon as compressed air is applied to it. Once the
impactors. In the series PKL impactors series, compressed air compressed air supply ceases, the cylinder exhausts rapidly and
presses the piston against a spring package; fast exhausting of the piston strikes the impact surface. With the aid of an
the cylinder causes the piston to strike the knocker plate or automatic control “ST” an impact sequence is initiated instead
container (like a hammer). of a single impact. The impact frequency can be regulated via a
throttle in the compressed air supply line.
Selecting the correct impactor:
The selection of the impactor is dependent on the material
properties, size, structure (set-up) and wall thickness of the
container. But the general conditions, for example ATEX
regulations, ambient temperatures or food regulations, are
also important.
Interval impactors have an effective diameter of up to 3m,
www.solidsandbulk.co.uk August 2007 • Solids & Bulk Handling 23
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