EP0355813B2 - Mixing recipient - Google Patents

Abstract

Described is a mixing bin for mixing bulk goods, particularly by pure gravity flow, comprising a mixing pipe disposed at a substantially central location in an outer container and provided with a plurality of intake ports disposed at different levels for withdrawing bulk goods at different levels from a bulk goods column enclosed by the outer container. All intake ports open into a common interior space of the mixing pipe. A respective deflector baffle projecting into the interior space so as to obturate a part of the cross-sectional area thereof is disposed above each intake port to be passed by the bulk goods flow in the interior space. For improving the result of the mixing operation in a structurally simple manner the invention proposes to vary the size of the part of the cross-sectional area obturated by the deflector baffles disposed at the different levels, the selected size of the obturated part of the cross-sectional area being determined by the amount of the bulk goods to be withdrawn through the associated intake port.

Description

The invention relates to a mixing container that explained in the preamble of claim 1 Art.

Such a mixing container is from GB-A-2 187 652 known. The well-known mixing container is for Subtract even amounts of bulk material Swallow openings designed at different heights. To achieve this, the known Mixing container according to the size of the swallowing openings of a given equation varies such that under lying swallowing openings are smaller than wider swallowing openings at the top. With the well-known Mixing container is therefore the size of each swallow opening precisely defined. With poorly flowable Bulk goods, however, are at risk of a so-called Bridging, i.e. under certain circumstances can over the opening Support particles of the bulk material against each other in such a way that the passage through this opening is blocked. This bridging becomes vertical standing openings through a correspondingly large dimensioned swallowing opening prevented. However, it is Size of the swallow openings as in the known Mixing tank determined by other considerations so one can possibly be feared Bridge formation when the bulk material flows through outer container through the swallow opening into the interior the mixing tube no longer through a Appropriate design of the swallow opening prevented will. This can possibly result in the mixing result be falsified.

There have been no attempts in the prior art missing, for mixing containers with a central mixing tube an even deduction of the bulk material over the Ensure the height of the mixing tube. Such one Mixing container is for example from FR-A-1 379 212 known. Contains in the known mixing container the inner mixing tube several departments, where each of the departments via a swallow opening communicates with the outer container. The swallowing openings of the individual departments are arranged at different heights, so that the bulk container located in different containers Heights can be subtracted into that Inside the mixing tube and from there with the one remaining in the outer container Bulk falls into a funnel from which it is removed can be. The mixing effect of the known Mixing container is however small. On the one hand, the Diameter of the mixing tube compared to the Inner container diameter not too large in order to achieve a mixing effect at all. Second, it remains above the swallowing openings each an empty room, which is the larger, the further down the swallowing openings are. Thereby valuable storage space is given away. Furthermore the known construction is relatively complex in the manufacture, since the individual chambers in the Mixing tube must be fitted exactly.

A mixing container can be seen from US Pat. No. 3,216,629, which is preferred for pneumatic circulation of the bulk material to be mixed is designed. There are a variety of mixing tubes with different designed deflector plates on the inside of the container provided. The mixing tubes point Openings at different heights, either outwards or inwards from Deflector plates are covered. In both cases however, the deflector plates for each opening in the mixing tube same size and cover, due to the relatively small diameter of the mixing tubes, inevitably over half the cross section of this Mixing tubes. It has now been found that with such an arrangement bulk goods predominantly over the bottom swallow opening each Mixing tube would occur. Beyond that Mixing container with a variety of relatively thin Mixing tubes for cohesive or poorly flowing Bulk goods are inappropriate because of the risk of bridging over the swallowing openings or in the small cross sections is very large and the known Mixing container still vertical due to the multitude of superimposed and relatively far in the Cross section of the mixing tubes reaching into it Deflector plates is increased.

DE-C-32 08 499 is a mixing container known, which should be designed so that essentially the same from different heights Shares of bulk goods can be deducted. To this Purpose, the mixing tube consists of a variety stacked funnels, their outlet openings each at the level of the inlet opening below Funnels are arranged. The funnels are essentially the same size, so that the in the annular heights arranged at different heights Entry openings for the bulk material from the outer Container and the circular openings for the fuel in the interior of the mixing tube are the same size at all heights. But with that this Mixing container also for bulk materials that are not easy to flow can be used, the ring-shaped Swallow openings into the mixing tube accordingly run great. So that about do not bridge the remaining slots this mixing tube construction must be remarkable Assume dimensions. In addition, the structure the mixing tube is relatively complicated and expensive. In addition, the mixing effect is not optimal, there for a complete mixing additional pneumatic circulation is used becomes.

The invention is therefore based on the object to design a mixing container of the type mentioned, that with simple and space-saving constructive Design the mixing result in a predetermined Way to influence.

The task is characterized by the Features of claim 1 solved.

The invention is based on the knowledge of the applicant that it depends on the size of the Deflector plates covered part of the cross section of the mixing tube depends on how much of the bulk material passes through the assigned swallowing opening. Will now used different sized baffle plates, so the mixing ratio of the different Layers of the bulk column in the outer Container originating bulk goods exactly predetermined and be dosed. A single, essentially central tube with a common Interior can be used, with none Dead spaces the storage capacity of the mixing container diminish. With the configuration according to the invention the sizes of the swallowing openings can be such be dimensioned so that bridging is prevented becomes. One determined for a specific bulk material Size of the swallowing mouth can then be for the whole Length of the mixing tube run the same thing simplifies the manufacture of the container. Is also achieved that over the entire height of the mixing tube essentially the same from each mouthful percentage of the bulk material in the mixing tube reached. The one coming out of the mixing tube Bulk material is therefore optimally mixed.

Due to the inclination of the deflector plates according to the Claims 2 and 3 is the formation of dead zones counteracted.

The embodiment according to claim 4 prevents that bulk material from swallowing openings above the entry of bulk material through an underlying Swallowing opening hindered.

Such a disability can be particularly simple can be avoided that the Deflector according to claim 5 in any case to below the lower edge of the assigned swallow opening extends.

Must the baffle be kept so small that the embankment area still developing located above the lower edge of the swallow opening would create the design according to claim 6 Remedy. The vertical extension plate has no influence on the predetermined percentage Proportion of the incoming bulk material however, ensure that no backflow can occur.

Claims 7 and 8 describe alternative Distributions of the swallowing openings around the circumference of the mixing tube, which is in practical testing have proven to be particularly useful.

Depending on the desired throughput themselves according to claim 9 also two or more Swallowing openings are at the same height, where the sum of the deducted from the same amount percentage of bulk goods by the sum the one covered by the assigned deflector plates Parts of the cross section is predetermined. Here can the swallowing openings in both the exact be arranged at the same height as a slight Have offset in height if this is required for structural reasons.

By the configuration according to claim 10 a good withdrawal of the bulk material from the outside Container guaranteed.

The deduction of the bulk goods from the whole The container is designed according to claim 11 facilitated.

With the features of claim 12 is achieved that a larger amount of bulk goods over the Mixing tube is withdrawn. This will make a broad Residence time distribution and therefore a good mixing effect reached.

The configuration according to claim 13 improved the flow of the bulk material and helps dead zones to avoid.

The configuration according to claim 14 improved the mixing continues.

Claims 15 and 16 describe alternative ones Forms the baffle plates, which prove to be useful have proven.

The embodiment according to claim 17 causes that the mixing tube is only arranged in its wall Swallowing openings are filled.

According to claim 18, the mixing tube except a circular also a polygonal cross section exhibit.

Claims 19 and 20 describe alternative Possibilities to manufacture the baffle plates and to be attached to the mixing tube.

By the configuration according to claim 21 can the mixing tube is particularly simple and inexpensive getting produced.

By arranging a larger nozzle according to claim 22, the assembly of the mixing container significantly improved because in this configuration the mixing pipe directly through the roof into the outer container can be inserted.

Claims 23 and 24 describe alternative Principles, such as the mixing tube on inexpensive and little time consuming inside inside Container can be arranged and attached.

Claims 25 and 26 describe an alternative Choice of materials.

Fig. 1 einen schematischen Längsschnitt durch ein erstes Ausführungsbeispiel eines erfindungsgemäßen Mischbehälters,

Fig. 2 den Schnitt II-II aus Fig. 1,

Fig. 3 den Schnitt III-III aus Fig. 1, und

Fig. 4 einen Längsschnitt durch ein weiteres Ausführungsbeispiel eines erfindungsgemäßen Mischbehälters.

Exemplary embodiments of the invention are explained in more detail below with reference to the drawings. Show it:

1 shows a schematic longitudinal section through a first exemplary embodiment of a mixing container according to the invention,

2 shows the section II-II from FIG. 1,

Fig. 3 shows the section III-III of Fig. 1, and

Fig. 4 shows a longitudinal section through a further embodiment of a mixing container according to the invention.

From Fig. 1 is a schematic representation Mixing container 1 can be seen, which consists of an outer Container 2 and one coaxial with the outside Container 2 arranged mixing tube 3 with an opposite the cross-section of the container is smaller put together. The outer container 2 has a cylindrical side wall 4 with a funnel-shaped Bottom part 5 on that at its lower end with a coaxial to the container axis Outlet opening 6 is provided. The bottom part 5 is with two different inclinations of his funnel wall trained to reduce the overall height. The outer container 2 is up through Roof 7 completed, through the coaxial to the container axis a first nozzle 8 protrudes. The inside diameter of the first nozzle 8 is larger or at least same size as the outside diameter of the Mixing tube 3 so that the mixing tube 3 through the Stub 8 can be mounted. The first nozzle 8 is closed at the top by a cover 9, the smaller by a second nozzle 10 Diameter is penetrated, the second nozzle also arranged coaxially to the container axis and is used to fill the container.

The mixing tube 3 is provided with struts 11 which protrude upwards into the first nozzle 8. The Mixing tube 3 is still over radial struts 12 on the inside of the outer container 2 on Transition between its cylindrical wall 4 and the funnel-shaped bottom part 5 is supported. Although only one strut 12 is shown can be a variety provided by struts distributed in the circumferential direction will. In the illustrated embodiment the mixing tube 3 is firmly connected to the struts 12, these being welded to the outer container 2. The struts 11 are not connected the inside of the first nozzle 8 and serve the centering and lateral support of the mixing tube 3. However, it is also possible to use the mixing tube 3 via the struts 11 or similar components (e.g. an extension of the mixing tube 3) on the nozzle 8 or hang directly on the roof 7. Instead of the fixed struts 12 would then only be another guide for the lower end of the mixing container 3 necessary.

The mixing tube 3 and the outer container 2 are made Made of an aluminum alloy, with all connections are welded. However, it is also possible to use for the mixing tube stainless steel and this via adhesive, screw or rivet connections to connect to the outer container made of aluminum.

The mixing tube 3 encloses an interior 14 with one over the predominant height of the mixing tube 3 constant round cross section. However, there are other polygonal cross-sections are also conceivable, especially when the mixing tube for relief its manufacture from individual parts is. The individual parts can be folded or be extruded.

The mixing tube 3 contains an upper one, in the direction on the filler neck 10 opening 15, the is covered with a deflector cone 16, so that the bulk material entered into the filler neck not directly, can get axially into the mixing tube. On the bottom the deflecting cone 16 is expedient a washing nozzle 17 is provided via a line supplied with washing liquid from the outside can be. This allows the inside of the mixing tube 3 can be cleaned easily. On the bottom the mixing tube 3 contains a funnel 18 which opens into an outlet opening 19. The funnel 18 is enough to form a tapered taper Annulus 29 to the area of the bottom part 5. The outlet opening 19 has a smaller one Diameter as the bottom part 5 at this height. In this way, it forms around the outlet opening 19 the funnel 18 of the mixing tube 3 an annular Outlet opening 20 through which in the outer container 2 located bulk goods can escape. The outlet opening 19 of the mixing tube 3 and the outlet opening 6 of the funnel-shaped base part 5 are coaxial arranged to each other. In contrast is the cross-sectional area the outlet opening 19 larger than that Cross-sectional area of the annular outlet opening 20 at the level of the outlet opening 19, do that from the Mixing tube 3 more bulk material is withdrawn than from the outer container 2. The walls of both Funnel 18 and the funnel-shaped base part 5 are inclined so that both in the mixing tube 3rd as well as in the annular space 29 mass flow with an over the cross sections are substantially uniform Flow rate is achieved, reducing training dead zones is avoided. The funnel 18 can also be designed such that a higher flow rate in the mixing tube 3 trains. The outlet opening 6 has the smallest Cross section of all existing outlet openings 19, 20 and is so large that bridging is avoided becomes. This can also make you feel above each other No outlet openings form bridges.

The mixing tube 3 is provided at different heights above its funnel 18 with a plurality of swallow openings 21 designed as openings in the wall of the mixing tube, of which the swallow openings 21.1 to 21.6, which are offset by 180 °, can be seen for purposes of illustration. The swallowing openings can be round, triangular, rectangular or parabolic. The size of the swallow openings is insignificant for the removal of the desired quantity of bulk material and is expediently dimensioned such that bridging in front of the openings, ie outside the mixing tube 3, is avoided. The first, uppermost swallow opening 21.1 is arranged in the vicinity of the deflection cone 16, below the maximum filling level 22 in the outer container 2. The second to sixth swallow openings 21.2 to 21.6 lie below it at predetermined intervals in accordance with the layers of the bulk material to be tapped. From the second swallowing opening 21.2 from above, a deflector 23 is arranged above each swallowing opening 21. Each of the baffle plates 23 has the shape of a conical jacket section (FIGS. 2 and 3), is inserted into a prepared, for example milled or sawn slot in the mixing tube 3, is inclined at an angle of 20 to 45 ° to the vertical and extends inwards below into the interior 14 of the mixing tube 3. The deflector plates 23 are of different sizes. In the present exemplary embodiment, the mixing container 1 is designed such that the same percentage of bulk material reaches the interior 14 of the mixing tube 3 through all swallowing openings 21. For this purpose, the deflector plates 23, and thus the parts of the cross section of the mixing tube 3 that they cover, become smaller from top to bottom according to the following formula: A = F n + 1

A

- Teil des Gesamtquerschnittes des Mischrohrs der von dem entsprechenden Abweisblech überdeckt werden soll

F

- Gesamtquerschnitt des Innenraums des Mischrohres

n

- Anzahl der über dem Abweisblech liegenden Schlucköffnungen.

Here is:

A

- Part of the total cross section of the mixing tube that is to be covered by the corresponding deflector

F

- Total cross section of the interior of the mixing tube

n

- Number of swallowing openings above the deflector.

According to this relationship, the Deflector plate 23.2 of the second swallow opening 21.2 half (F / 1 + 1) of the total cross-section from above cover the mixing tube 3. The deflector 23.3 the third swallow opening from above 21.3 should a third (F / 2 + 1) of the cross-section that Deflector plate 23.4 of the fourth swallow opening of above 21.4 a quarter, the deflector 23.5 of the fifth Swallow opening from above 21.5 and a fifth the deflector 23.6 of the sixth swallow opening cover a sixth of the cross-section from above 21.6, thus from all swallowing openings 21.1 to 21.6 the same percentage of the bulk material arrives in the funnel 18. These relationships will 2 and 3, which is a plan view point to the first and sixth baffle, shown in more detail, for reasons of clarity other components have been omitted. It should be assumed that the mixing container 1 with closed outlet opening 6 with bulk material along the arrows A until it is in the outer Container 2 has set the fill level 24. Conditionally by arranging the top edge of the top one Swallow opening 21.1 below the fill level 24 in the outer Container 2 is a little in the mixing tube 3 Train lower level 25. Now becomes the outlet opening 6 opened, so both slip in the outer Container 2 and those in the mixing tube 3 Bulk goods columns after. The prevent arranged above the respective swallowing openings 21 Deflector 23 the slipping over this Swallowing part of the Bulk column inside the mixing tube 3, so that from outside, i.e. from the bulk column on the outside Pass container 2, bulk material into the mixing tube 3 can. Due to the different sizes the bulk material flow in the hopper 18 will be as follows put together. At the first swallow opening 21.1 all bulk goods come from interior 14 from the top layer of the bulk column in the outer Container. As shown in Fig. 2, stands for this bulk material in the area of the deflector 23.2 of the second Swallow opening from above 21.2, however, only half Cross section of interior 14 available while under the protection of the deflector 23.2 over the second swallow opening 21.2 bulk material over the another half cross-section of the interior 14 occur can. At the height of the deflector 23.3 the bulk material flow in the interior thus settles in each case from half of the bulk goods from the top and the second swallow opening 21.1 and 21.2 together. However, for this bulk material flow are in Height of the deflector 23.3 only two thirds the cross section of the mixing tube 3 is available, while over the remaining third bulk material from the third fill opening 21.3 get into the interior 14 can. This continues until the sixth Swallow opening 21.6, where to pass each equal proportions of the five swallowing openings above five sixths and to exit from the sixth swallow opening 21.6 one sixth of Cross section is available. Into the funnel 18 thus a mixture of essentially comes out equal shares, i.e. one sixth each, bulk goods from each of the six swallowing openings 21.1 to 21.6. At the level of the outlet opening 19 the bulk material flows from the funnel 18 and the annular space 29 merged. The one out the flow of bulk material emerging from the outlet opening 6 thus from subsets resulting from the heights of the Swallow openings 21.1 to 21.6 and the funnel-shaped Bottom part 5 were removed.

To prevent the standing in the interior 14 Bulk column in the range of the second to last swallow opening 21.2 to 21.6 and the Entry of bulk material from the outer container 2 is hindered, the baffle plates 23 are expedient pulled down so far that one theoretically forming embankment surface 26, which in Fig. 1 was drawn in dashed lines, the lower edge the respective swallowing mouth is not reached. With appropriately large baffle plates, such as they are necessary for the upper swallowing openings, this condition is easily met. Will however, the deflector plates are smaller, and they even end above the lower edge of the respective swallow opening, an extension plate 27.4 to 27.6 is provided, that at the free edge of the corresponding Deflector 23.4 to 23.6 is arranged. The extension plate 27 extends vertically downwards and essentially parallel to the direction of flow of the bulk material in the interior 14, so that its Area has no influence on the percentage distribution that has bulk flows. The extension plate 27 ends at a point where the free Edge trained slope area below the assigned swallowing opening 21.4 to 21.6. Depending on the flow properties of the bulk material and the associated slope angles can the free ends of the deflector plates 23 or the extension plates 27 at, below or, at very steep embankment areas, also just above the lower edge of the corresponding swallow opening 21 ends.

4 is a modification of the invention Mixing container 1 can be seen, the same or comparable components with the same reference numerals marked and not explained again were. The mixing container 1 of FIG. 4 also has one outer container 2 with a cylindrical side wall 4 and a funnel-shaped base part 5 with Outlet opening 6. The filling is done by a Filling nozzle 10 'arranged directly in the roof 7. A modified mixing tube 3 'has on it One on the top and one on the bottom Cross section corresponding opening, the upper opening 15 in turn through the deflection cone 16 is completely covered. The lower outlet 28 is in turn in the funnel-shaped base part 5 with formation of an even smaller annulus 20 'arranged as in the embodiment of FIG. 1. The most important modification concerns, however Arrangement of the swallow openings, however, analog the embodiment of FIG. 1 is formed are. 4 each have two of the swallowing openings 21 arranged at the same height. The mouthfuls 21 of each pair lie at an angle of 180 ° opposite, the pairs of swallowing openings in different heights offset from each other by 90 ° are. The size of the deflector plates 23 becomes analog the based on the embodiment of Fig. 1 formula determined, with the exception that A is the sum of all of the baffle plates in the same Represents height covered parts of the cross section.

In all embodiments, the Deflector plates with or without their extension plates also by simply cutting and pressing the wall of the mixing tube. The shape of the deflector plates can also vary be, the described and drawn flat baffle plates, for example due to curved, in particular conical pieces of sheet metal formed can be. Also the arrangement of the swallow openings can be changed; for example quite possible, superimposed Swallow openings by 120 or 90 ° or by everyone any other angle to each other. If necessary, more than two can be evenly swallowing openings distributed around the circumference be arranged at the same height, their Baffle plates dimensioned in a known manner will. It is still possible the first, top swallow opening, for example to lay in the deflector cone, but then the top one provided in the wall area Swallow opening is passed by the bulk material and thus has to receive a baffle. The order the nozzle and possibly also the arrangement of the mixing tube with respect to the central axis of the outer container can also be according to the practical Requirements such as Space requirements, changed will.

Claims (26)

1. A mixing container (1) for mixing bulk material by gravity flow, having a mixing tube (3, 3') which is arranged substantially centrally and vertically in an outer container (2) and which is provided with a plurality of absorption openings (21.1 to 21.6) arranged at different levels for the escape of bulk material from different levels of a bulk-material column disposed in the outer container (2), the quantity of the bulk material to escape through a absorption opening (21.2 to 21.6) being determined while taking into account the number of absorption openings (21.1 to 21.5) lying thereabove, all the absorption openings (21.1 to 21.6) opening into a common inner space (14) in the mixing tube (3, 3'), and a deflector plate (23) which projects into the inner space (14) and which covers part of the horizontal cross-section of the inner space (14) being arranged above each absorption opening (21.2 to 21.6) to be passed by the bulk material in the inner space (14), characterized in that the quantity of the bulk material to escape through the absorption opening (21.2 to 21.6) is determined while thing into account the number of absorption openings (21.1 to 21.5) lying thereabove through a different size of the part of the horizontal cross-section of the inner space (14) covered by the deflector plates (23) arranged at different levels and associated with the respective absorption opening (21.2 to 21.6), the size of the absorption openings (21.1 to 21.6) being determined by the characteristics of the bulk material to prevent bridge formation, wherein, for the escape of substantially equal portions of bulk material in terms of percentage from all the absorption openings (21) into a inner space (14) which has a constant horizontal cross-section over its height provided with the absorption openings (21), the deflector plate (23) of each absorption opening (21.2 to 21.6) to be passed by the bulk-material flow in the inner space covers the part of the cross-section of the mixing tube (3, 3') divided by the number of absorption openings lying thereabove plus one.
2. A mixing container according to Claim 1, characterized in that the deflector plates (23) are arranged inclined inwardly downwards.
3. A mixing container according to Claim 2, characterized in that the deflector plates (23) have a inclination of from 20 to 45° to the vertical.
4. A mixing container according to one of Claims 1 to 3, characterized in that the deflector plate (23) extends so far downwards that the slope face (26) formed by the bulk material from the absorption openings (21) lying thereabove is situated below the lower edge of the associated absorption opening (21).
5. A mixing container according to one of Claims 1 to 4, characterized in that the deflector plate (23) extends as far as the lower edge of the associated absorption opening (21).
6. A mixing container according to one of Claims 1 to 5, characterized in that the deflector plate (23) contains a extension plate (27) which adjoins a free edge projecting into the inner space (14) of the mixing tube (3, 3') and which extends downwards substantially vertically.
7. A mixing container according to one of Claims 1 to 6, characterized in that absorption openings (21) lying one above the other are offset by 120° from one another in each case.
8. A mixing container according to one of Claims 1 to 6, characterized in that absorption openings (21) lying one above the other are offset by 180° from one another in each case.
9. A mixing container according to one of Claims 1 to 8, characterized in that two opposite absorption openings (21) or a plurality of absorption openings (21) distributed uniformly on the periphery are arranged at the same height in each case, wherein the overall proportion of bulk material in terms of percentage - able to escape through the absorption openings at the same height - results from the sum of the parts of the horizontal cross-section of the mixing tube (3') covered by the associated deflector plates (23) in each case.
10. A mixing container according to one of Claims 1 to 9, characterized in that the outer container (2) has a funnel-shaped base part (5) with a outlet opening (6) into which an outlet opening (19, 28) of the mixing tube (3, 3') opens so as to form an annular outlet opening (20, 20').
11. A mixing container according to Claim 10, characterized in that the mixing tube (3) is provided at its lower end with a funnel (18) comprising the outlet opening (19).
12. A mixing container according to one of Claims 10 and 11, characterized in that the cross-sectional face of the annular outlet opening (20, 20') is smaller than the cross-sectional face of the outlet opening (19, 28) of the mixing container (3, 3').
13. A mixing container according to one of Claims 10 to 12, characterized in that all the funnel-wall openings are designed for mass flow.
14. A mixing container according to one of Claims 11 and 12, characterized in that the bulk material in the funnel (18) of the mixing tube (3) has a higher flow velocity than in the outer container (2).
15. A mixing container according to one of Claims 1 to 14, characterized in that the deflector plates (23) are made flat.
16. A mixing container according to one of Claims 1 to 14, characterized in that the deflector plates (23) are made convex, and in particular tapered.
17. A mixing container according to one of Claims 1 to 16, characterized in that a deflector cone (16), which spans the entire horizontal cross-section of the mixing tube (3, 3') and prevents the mixing tube (3, 3') from being filled axially from above, is arranged above the uppermost absorption opening (21.1).
18. A mixing container according to one of Claims 1 to 17, characterized in that the mixing tube (3, 3') has a polygonal horizontal cross-section.
19. A mixing container according to one of Claims 1 to 18, characterized in that the deflector plates (23) are constructed as bends of wall parts of the mixing tube (3, 3').
20. A mixing container according to one of Claims 1 to 18, characterized in that the deflector plates (23) are guided and held in previously sawn or milled slots.
21. A mixing container according to one of Claims 1 to 20, characterized in that the mixing tube (3, 3') comprises bevelled or extruded parts.
22. A mixing container according to one of Claims 1 to 21, characterized in that the outer container (2) has a socket (8) which is situated in its roof (7) and the internal width of which is greater than or equal to the external width of the mixing tube (3).
23. A mixing container according to one of Claims 1 to 22, characterized in that the mixing tube (3, 3') is supported by way of struts (12) in the region of the lateral wall (4) and/or of the funnel-shaped base part (5) of the outer container (2).
24. A mixing container according to one of Claims 1 to 22, characterized in that the mixing tube (3, 3') is suspended on the roof (7) of the outer container (2) and is merely guided in the lower part of the outer container (2).
25. A mixing container according to one of Claims 1 to 24, characterized in that the mixing tube (3, 3') and the outer container (2) are produced from an aluminium alloy and all joints are welded.
26. A mixing container according to one of Claims 1 to 24, characterized in that the mixing tube (3, 3') is a high-grade steel structure, which is connected to the outer container (2) of aluminium by adhesion, screw or rivet connexions.

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