MATERIALS HANDLING
FEFFICIENT DROM AISTANCE
Oliver Lüer reveals why a distance knocker off ers advantages for many diff erent process plant applications
I
t is not always possible to attach a pneumatic knocker directly to a silo, for instance, if the container becomes hot or if it moves. In such cases, the pneumatic distance knocker from singold gerätetechnik off ers a solution. Company founder Erwin Lüer developed it using advanced engineering. T e basic concept is the same as that of the traditional pneumatic knocker: spontaneously released compressed air pressure accelerates the impact piston, which is designed as a permanent magnet, after it is released. In contrast to the conventional knocker, the distance knocker’s piston rod strikes a moving impulse part, which is strongly accelerated according to the impulse- momentum theorem and ultimately transfers the energy to the container to be knocked off . T is process takes place at such a high speed that the human eye can hardly perceive it. T anks to the additional impulse part, the Distance-
Knocker QJ can be mounted at a distance from the silo; this means an enormous extension of the application possibilities.
Distance-Knocker in use on rotating drum
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A WIDE RANGE OF POSSIBLE APPLICATIONS T e distance knocker is always the method of choice when a successful cleaning can be achieved with a hammer blow but a classic knocker cannot be mounted directly on the container due to the temperature or movement of the object to be knocked off . T is applies, for example,
The Distance- Knocker QJ
has several key advantages
to fi lling and emptying stations with changing containers, rotating drums and silos with hot walls. Because of the spacing, the distance knocker can be used, for example, in rotary kiln drying systems with surface temperatures of up to 300°C and more. T e QJ is also suitable for automatically knocking off fi lter cups or fi lter baskets of diff erent sizes. A design with a thread at the end of the piston rod even makes it possible for the impact body and thus the impact geometry to be adapted case- specifi cally to any conceivable application situation. For example, Vulkollan buff ers at the end of the piston rod are available as accessories. T is makes the distance knocker a valuable tool in many diff erent
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