Agitating – Rubber or heavy plastic working – Stationary mixing chamber
Patent
1997-07-15
1999-08-10
Soohoo, Tony G.
Agitating
Rubber or heavy plastic working
Stationary mixing chamber
366309, 366307, 366304, 366313, B01F 704
Patent
active
059348011
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a mixing and kneading apparatus for the, in particular, thermal treatment of products in the liquid, pasty and/or pulverulent state, with or without the supply and discharge of gases and vapors, in a housing, a shaft rotating in said housing and having disk segments or similar disc-like elements arranged on it, which segments or elements interact with mating kneading elements fixed on the housing, there being formed between the mating kneading elements, and between the mating kneading elements and the disk segments, an open space in which a mixing arm engages from the shaft.
Such mixing and kneading apparatuses are known, for example, from German Patent Specification 23 49 106 or from U.S. Pat. No. 3,678,422. The arrangement shown therein ensures a very good mixing and kneading action. Furthermore, encrustations of product on, in particular, heated elements of the apparatus, for example shaft, housing wall, disk segments and the like, are avoided effectively. However, in the case of certain products, in particular in the case of viscous pasty products, a torus of product forms in those regions between two disk segments in which there is no product treatment by a mating kneading element and, in the worst-case scenario, it is possible for this torus of product to remain in these regions, in which case it is not kneaded any further. In order to avoid this, it is expedient to use a mixer arm which is fastened on the shaft and engages in the toric space. As a result, the formation of a dead space in which the product does not undergo any treatment is avoided.
The object of the present invention is to make additional improvements to the mixing and kneading action in the toric space.
This object is achieved in that mixing arms of different configurations engage in the open space (toric space) from the shaft.
The different configurations of the mixing arms should be such that the entire toric space is worked by means of relatively narrow mixing arms. That is to say non-worked spaces within the toric space are avoided, as a result of which the mixing and kneading action is considerably improved. The distribution of the product is more uniform as a result since there are more elements which move the product. This also improves the mixing action. Furthermore, the situation where mixing arms only ever move on one pre-determined path, in which case the shaft is subjected to considerable force-absorbing peaks if, for example, a torus collapses, is avoided. The different configurations of the mixing arms mean that the product is distributed uniformly in the machine, with result that the absorption of force by the shaft is balanced out.
Each mixing arm preferably comprises a stem and a crossbar. In one exemplary embodiment of the invention, the idea is that the crossbar should always be of the same configuration, while the stem has a different length.
In contrast, in the case of another exemplary embodiment, it is also possible for the stem to have the same length, and to project approximately into the center of the toric space, but for the crossbar of mixing arms within an annular toric space to be of different configurations. Said crossbar may be set obliquely, turned round, curved, twisted, Z-shaped or S-shaped or the like. There are a large number of configurations which are intended to be covered by the invention.
In order that the mixing arm can move through the product better, it should be configured like a plowshare in cross section. There are a number of variations in this case too, and these depend on the product which is to be worked.
Further advantages, features and details of the invention can be gathered from the following description of preferred exemplary embodiments and with reference to the drawing in which:
FIG. 1 shows a longitudinal section through part of a kneading and mixing apparatus according to the invention;
FIG. 2 shows a cross section through the kneading and mixing apparatus according to FIG. 1;
FIGS. 3 to 6 show plan views of different exemplary embodiments of mixin
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Kunz Alfred
List Jorg
Schwenk Walther
List AG
Soohoo Tony G.
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