Pneumatic Knockers
The Pneumatic Knocker achieves a high grade of impact energy by the spontaneous release of the accumulated compressed air pressure. The piston designes as a permanent magnet, adheres in the end-position to the anchor plate until the compressed air fed through the lid overcomes the magnetic force. The impact piston loosens from the anchor plate, is very highly accelerated vy the accumulated compressed air and hits onto the striker with a speed of 6 to 7 m/sec., which transmits the impact to the silo wall. When deaarating the cylinder, the piston will be pressed back into the starting position by means of the spring.
Application
The Pneumatic Knocker is used for bulk goods with material flow problems as for instance bridge, siphon and residue formations, when high speed shakers and vibrators with soft sine-shaped oscillations are no longer effective. The effect of the knocker is comparable to that of the famous "silo hammer", but without distorted silo spouts additionally impeding the material flow.
The Pneumatic Knocker produces an ideal elastic shock, referred to as impact energy E = m · v²/2 and impulse J = m · v. There is no impact force or out-of- balance such as vibrators generate. The effectiveness of the knocker may be judged according to the following rule: "If the product can be knocked off or be brought to flow by a hand hammer, the "Pneumatic Knocker" would also be effective."