Agitating – By movement of mixing chamber relative to stationary support – Mixing chamber rotatable only
Patent
1984-09-19
1986-09-16
Simone, Timothy F.
Agitating
By movement of mixing chamber relative to stationary support
Mixing chamber rotatable only
366224, 366225, 366231, 366297, 366311, B01F 900
Patent
active
046119221
DESCRIPTION:
BRIEF SUMMARY
The invention relates to an apparatus for treating materials which are capable of flow, comprising a container which rotates about its central axis which is inclined with respect to the vertical, with a wall and/or bottom scraper plate which is arranged substantially stationarily with respect to the cylindrical inside wall of the container, a discharge opening disposed in the bottom of the container and a rotating tool which engages into the material.
German patent specification No. 2 003 201 already discloses a treatment apparatus of the kind set out above. In that apparatus however, the rotating container is driven at a super-critical speed of rotation. That arrangement uses such a speed of rotation that the centrifugal forces acting on the pieces of the material are greater than the weight of those pieces themselves. By virtue of the super-critical speed of rotation, defined in that manner, centrifugal forces are applied to the mix material in such a way that it adheres to the cylindrical inside wall surface of the container. For that reason, disposed at a stationary location in the known mixing container is a deflector member which cleans off the wall of the container and which removes the material to be treated, from the action of the centrifugal forces, in that it peels the material off the inside wall surface of the container and deflects it on the high-speed mixing tools. The known deflector member also has a lower portion which extends from the outer peripheral wall into the region of the discharge opening.
Such a treatment machine suffers from the disadvantage that, in order to produce a good mixing effect, the particles of material to be mixed must be displaced relative to each other as intensively and as frequently as possible. However, the use of the centrifugal force means that the material to be treated is pressed firmly against the inside wall surface of the mixing container, thus giving increased internal friction. That reduces the mobility and accordingly the mixability of the material.
The above-mentioned deflector member is also provided for turning over the material to be mixed. Because the deflector member has to remove the material clinging to the inside wall surface of the container, thereby overcoming centrifugal force, and deflect it towards the middle of the container, it also acts at the same time as a brake on the rotating container which on the one hand transports the treatment material, under pressure, against the deflector member. That means that the amount of power required for driving the container is comparatively large.
When the central axis of the container is in an inclined position, the high-speed mixing tool is disposed in quadrant III or IV thereof, that is to say, in the region of the rising flow of material. By virtue of that arrangement, the upward flow of material in the container is disturbed, with the result that substantially more material is to be found in the lower region of the container than in the upper region thereof. Due to that unequal filling of the container, the available mixing space in the upper part of the container is not utilised so that, in comparison with the available volume, the treatment machine has only a low filling capacity and thus has a lower treatment capability.
When dealing with materials to be mixed or materials to be treated, which have a low level of internal friction, such as for example powders or fluids, it is really difficult for the material to be treated to be accelerated by the movement of the container in such a way that the required flow of the material in the treatment container and the resulting mixing or treatment effect produced thereby is achieved, in spite of the high-speed mixing tool which has an additional opposing action.
In addition, problems arise by virtue of the uneven or irregular layer of treatment material in the container, when vapour or gases is or are introduced into the layer of material to be mixed, by means of tubular lances.
The problem of the present invention is therefore to improve an apparat
REFERENCES:
patent: 3746267 (1973-07-01), Myers et al.
patent: 4522499 (1985-06-01), Hudelmaier
Eirich H.
Eirich P.
Eirich W.
Miller Austin R.
Simone Timothy F.
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