Agitating – Stirrer within stationary mixing chamber – Rotatable stirrer
Patent
1993-11-05
1995-04-18
Scherbel, David A.
Agitating
Stirrer within stationary mixing chamber
Rotatable stirrer
366328, B01F 704
Patent
active
054072735
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention concerns a mixing instrument for the treatment of solids or individual solid components in a horizontal container with a concentrically arranged shaft mounted in the container in a rotatable fashion and supporting a plurality of axially separated mixing instruments attached to the shaft which are directed radially facing the inner wall of the container and which terminate at a small separation from the inner wall of the container, whereby the mixing instrument itself exhibits an arm and a mixing body comprising at least two plate-shaped mixing elements.
BACKGROUND OF THE INVENTION
A mixing instrument of this type has become known through the German patent 11 22 355.
Mixers having horizontal containers are known for the mixing of pourable materials, in which the material to be mixed is moved with a mixing instrument rotating with the shaft. Plough-share blades are preferentially utilized as mixing instruments and have proven themselves over a wide range of applications. With these mixing instruments it is possible to produce multicomponent mixtures of high mixing quality. Plate-shaped mixing bodies are also known which exhibit sectional areas which are concave and/or convex. Should strongly adhering products be mixed, dried or processed in some other fashion in horizontally arranged mixers, driers or reactors it is known that a product layer can build-up on the inner wall of the container, forming between the inner wall of the container and the front surface of the mixing element (product deposit).
An increased gap between the mixing instrument and the inside wall of the container occurs because the shaft, due to its own weight, exhibits a certain amount of bending if it is rotatably mounted only at the shaft ends. In addition an increased gap between the mixing instrument and the inner wall of the container is also required when the container wall is warmed by means of an energy carrier. The container thereby experiences a certain deformation which changes in dependence on the temperature and the material utilized for the container, the shaft and/or the mixing instrument. It is therefore clear, even in highly precise manufacturing of mixers, driers, and reactors, why an increased gap between the mixing instrument and the inner wall of the container is necessary.
The product deposit which builds up in the gap can harden and continue to build-up so that the energy absorption of the mixing instrument is increased. The deposit can break-off from time to time and thereby, cause a deterioration of the quality of the final mixture. A product deposit of this kind is also overheated in driers or reactors, so that the product itself is destroyed in the vicinity of the inner walls of the container. In reaction processes stoichiometric conditions could thereby change in an uncontrolled fashion.
The known mixing instrument is for these reasons secured in the product region, in a resilient fashion, in order to adjust, by means of a predetermined spring tension, the gap width between the inner wall of the container and the front surface of the mixing instrument. This causes difficulties in construction and is suspectible to failure during manufacturing operations.
A cleaning device for mixing containers or for containers capable of performing motion is known from U.S. Pat. No. 2,320,976 which comprises harrow-like flexible blades. The blades are displaced and attached to rods which move the material to be mixed. The rods rotate and the blades seat, under bias, on the inside surface of the container and thereby scrape product deposit off the inside wall. The blades are seated in a pivotable fashion.
The underlying purpose of the invention is therefore to further improve a mixing instrument of the above mentioned kind in such a manner that the product deposit in the gap between the inner wall of the container and the mixing instrument is largely prevented or is removable in a reliable fashion.
This purpose is achieved in accordance with the invention in that the mixing elements are
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Ullmanns Encyklopadie der technischen Chemie Band 2, 4. neubearbeitete und erweiterte Auflage, Verfahrenstechnik I (Grundoperationen).
Cooley Charles
Gebrueder Loedige
Scherbel David A.
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