DE2405290A1 - MIXED SILO - Google Patents

Description

Priority; February 7, 1973; Switzerland;
Registration no .: 1729/73

The invention relates to a mixing silo with a storage room, respectively. storage container and a collecting device arranged below, as well as a connecting element for simultaneous continuous Removal of flowable bulk material from different heights of the storage room, respectively. Storage container and mixing the same in the collecting device using gravity . - ""

A mixing silo of this type is known which has a container and a Saimneltricirfcer and a large number of pipes as connecting elements having between container and collecting funnel.

409832/0 8-7 9

The pipes are in one over the entire height of the container Arranged in a circle. Each tube has several lateral openings evenly distributed over the height. All pipes open at the bottom into a common collecting funnel, where the product drawn off through the openings flows.

This mixing silo works as follows: When the container is filled, the product passes through the openings into the Pipes, which are filled gradually. If the product is withdrawn, it sinks faster in the pipes than in the Container itself - The product only runs through the uppermost opening of each pipe, since the lowering, however, the product column that is jammed from below and is connected to it, allows the product to pass through the lower ones Openings prevented. The uppermost openings of the individual tubes are offset and arranged at different heights, that when the silo is full, product is drawn off and mixed from all zones of the silo. If the level in the container now falls, the uppermost openings come to lie one after the other over the product, so that you can see with a fixed product withdrawal from the Collecting funnel the level in * the corresponding pipes up to lowers to the next lower opening. This immediately takes over the function of the higher opening. This process repeats itself until the container is empty and ensures approximately the same mixing quality with different container fillings.

U Q 9 8 3 2/0 8 7 9

With a central outlet slide and a regulating device At the outlet of the collecting funnel, the mixture can still be controlled to some extent.

Older mixing silos with an identical method of operation, but a somewhat simpler structure, are particularly suitable for mixing Grain has been used.

All of these known solutions have a common disadvantage. The Mischffel't. 1-pnn can only be improved to the extent that the number of pipes, respectively. the openings at different heights above the silo outlet is increased. That means the price of a silo increases almost proportionally with the mixing quality.

It must therefore already in the planning resp. the sale of the mixing effect and the number of channels required for it will. In many cases, the mixing effect is difficult to predict and is influenced by variable operating data. If you don't want to take any risk, you will always opt for a mixing silo with a large number of discharge channels, i.e. opt for an elaborate Miächsilo.

A mixing silo with a central discharge device extending over part of the storage container was also proposed. There are three possible ways of doing this:

409832/0879

Variant A with several telescopically nested tubes, all of which are at the same height above the mixing line at the bottom, however, end up at different heights in the storage container. The smallest tube in the middle extends the furthest, the largest and least far up into the storage container. In this way, the storage container can be at different heights product can be withdrawn and mixed at the same time. The annular Ducts are divided into four compartments with vertical walls.

Variant B has only a single, relatively large central exhaust pipe, but with partition walls in six circular segments is divided. Lateral openings are made in the circle segments at different heights. The openings allow product to be drawn off and mixed at different levels.

Variant C is similar to variant A. Instead of several tubes, a triangular sheet metal is rolled up in several turns with a spacing between the turns, which creates a snail-like appearance. ^E ven in this document are vertical walls a multiple subdivision, so that openings at different heights arise.

409832/0879

If you compare these three variants A, B and C, you are inclined to assume a development from variant A to variant B and from variant B to variant C. Especially with variant C one does not find a jump from one opening to the next higher as with variants A and B. With variant C as with Variant A, the openings are spatially offset in two dimensions, in height and in distance with respect to the vertical Axis of the storage container.

The publication describing this mixing silo also gives the interesting results of comparative tests.

A container without mixer fittings did not result in any practical use mixing effect, which is known per se.

Variant A approaches the theoretical mixing curve for perfect mixing, while B, on the other hand, deviates considerably from it, and as a surprise, the snail-like variant C is significantly worse than variant B. The result is so bad at C that in most cases it could not be accepted.

Another proposal is known in which a number of mixing containers are arranged around a central tube. The central pipe has a number of openings for each mixing container »Die

AO9832 / 0879

Openings are distributed in such a way that the product is filled in can only flow into one or two outer mixing containers at the same time. By filling the mixing container in At different time intervals, but a simultaneous merging during emptying, the mixing effect is created. at Filling pipes with a small diameter are not known to cause disruptive segregation processes when bulk materials flow out, as is the case with Containers and silos without internals. On the other hand, there is segregation in the mixing containers arranged around the central Kohr -expected. The problem of gravity mixing is therefore not solved with this proposal either. With this device the mixing quality depends on the type of filling. Afterwards, when emptying, a bad "filling mixture" can no longer be improved will. The main disadvantage of this solution is that the container for a mixture is filled once and each Once again it has to be completely emptied. Since a continuous process is very often initiated today, this would be done in batches working mixing tanks do not fully satisfy.

The invention has now been based on the object of a mixing silo or as the English expression for it reads, a to build "gravity blender",

- which, without a large number of connecting elements, already has a sufficiently good mixing effect in a standard version results, and

409832/0879

which can work in batches as well as in the continuous flow principle, and

with partial filling results in the same mixing effect as possible as with full ^ iI _{0, and}

- allowed the batches according to their proportions

to be considered in the mixture in the storage container, and

- Can add the right amount of even the smallest batches to the mixture.

The solution according to the invention is characterized in that between the storage container and the connecting element a removal opening in a helical shape on the outer circumference of the storage room resp. Storage container is arranged and the connecting element has a smaller cross section than the container having.

With this solution -will actually become an infinite number Product withdrawn at the same time over the height of distributed zones. The rat hole problem of many known solutions with central Abzuge3.ementen is effectively eliminated, because all fears that when withdrawing product from a mixing silo according to the invention with a very dome-shaped Removal opening the lower part of the removal opening

AC9832 / 0879

would be highly preferred as the shortest route to the collector from the product flow have not occurred.

Through the helical removal opening on the The outer circumference of the storage container provides the product with a "hold" for possible bridges and supports withdrawn. The product is, as it were, "peeled off" and distributed over the circumference from each height zone fed in the correct proportion to the collecting device.

Also just a roughly equivalent mixed silo To build, one would have with the known solutions a very large number of extraction openings and extraction shafts or channels must be provided. In fact, known solutions already have thirty to fifty flue pipes used as connecting elements from the storage container to the collecting device.

The mixing silo according to the invention, on the other hand, allows in any case with a relatively small structural effort to achieve a maximum mixing effect for such gravity-mixing systems.

40 9832/0879

For easily flowable bulk goods such as plastic granulate A good mixture is achieved on the same principle even if the storage container is partially full. It can only a very small loss of the mixing effect due to the thinner layer thickness can be observed, since each A proportionally reduced amount is deducted from the height zone of the bulk material column formed by the individual batches and is mixed.

A product take-off arranged on the circumference has a rearrangement of the horizontal layers into a bell-like layer structure. The bell-like layer structure is spatially changed by the course of the removal opening. The arrangement of at least one central exhaust pipe in the lowest part of the has now proven to be very advantageous Container proved. A relatively large central opening allows the bell-like layer structure to be closed in that sense influence that the point coinciding with the vertical storage container axis is removed and thus again ■ a flatter and more easily controllable layer formation is achieved.

A metering slide in the central outlet opening and a corresponding slide can also be used the mixing quality can still be influenced in a favorable sense at the outlet of the collecting device.

. A09832 / 0879

· ■ ίο -

In a further very advantageous embodiment extends the removal opening is in one cycle over the entire height of the storage container, and / or has an increasing or decreasing cross-section from top to bottom.

In many cases it is necessary that an equal amount is deducted from the topmost, last item
as from the lower-lying batches. This is especially true for
those cases where any additional treatments such as ■ cooling or drying the topmost, freshly placed silo are not required.

In a further advantageous embodiment, further residual removal openings are arranged below the removal opening extending over the entire mixing height. Such very advantageous embodiments make it possible to keep the mixing process constant with a variable filling level in the container. As with these
Embodiments the lowering speed of the bulk material in
Connection element is substantially larger than in the storage container
itself, product only enters the connecting element through the highest removal opening below the material level.

If the container is only half full, the part of the
Withdrawal opening that is above the product, no product

4G9832 / 0879

to be pulled. The bulk material therefore sinks at this point in the connecting element to the level of the lower Remainder removal opening, and only then does the lower itest Entnahrae opening take over the function of the higher one Removal opening. This solution gives for each level A very good mixing effect, especially with goods that are difficult to flow.

In another embodiment, several are helical Removal openings on the outer circumference, the storage container comprising, arranged one above the other. Because of the diverse requirements in practice, it will always be necessary to be different to create large mixing silos. This embodiment has a very great advantage because the individual ones are on top of one another arranged removal openings in standard elements can be attached. It would be possible to use mixing silos from the smallest construction heights of up to twenty meters and more with the same standard elements. In many cases it becomes necessary be, the cross-section of the removal openings small to be selected in relation to the cross-section of the connecting elements. It can also be an advantage for goods that are difficult to flow into be, the deeper removal openings in cross-section to choose something bigger than the higher ones. In this way it can be achieved that with the different removal openings an equal amount of product is withdrawn from each height section

■. A0 9832/0879

A further version sf ο rm can be used instead of a central Outflow for the lowest part of the silo by installing a roof with the top pointing upwards, also for the lowest part In the silo section, consequent lateral outflow can be forced.

The connecting element can, for example, in all embodiments subdivided with possibly continuous vertical or slightly helical guide strips will.

It is also possible to guide the guide strips only over a certain height in the connecting element in order to be able to do so to provide further guide strips, which are offset by half a division on the circumference with respect to the guide strips are in such a way that the upper and lower guide rails are closest to one another, the entire discharge height take in.

In the area where the upper and lower guide rails are located A lower removal opening can now come close or, if need be, when viewed in perspective, overlap to be ordered.

The combined guide strips that extend over the entire height, e.g. six pieces at the top, respectively. below, can thus take on two functions. On the one hand, the product does not move in the circumferential direction, which is special is very advantageous for highly free-flowing products.

Uü 3832/0879

The transitions from the upper to the lower guide rails can now be arranged in an imaginary helical line, i.e. viewed in a circumferential direction, the lower guide rails become longer and longer and those above are offset arranged guide rails getting shorter.

If one arranges the lower removal opening in the same imaginary helical line, then in this very simple way, at most with small baffles, even with pourable products at the same time through the upper and lower removal opening Product can be withdrawn, so that the mixing effect is thus improved without significant additional effort can be.

You can influence the lowering speed in the individual compartments Install means such as slider etc. and thus as with known mixing silos control the mixing quantity of individual zones.

The drawings show - "- exemplary embodiments of the subject matter of the invention shown, namely:

fig. 1 shows a schematic vertical section through a Mixing silo.

2 shows schematically the operation of the ge in Fig. 1 showed mixing silos, above the unwound inner jacket.

4C98 3 2/0879

Fig. 3 shows schematically a _US A guide die with deeper residual extraction openings

Fig. 4 shows the development of the inner jacket of Fig. 3, and schematically the product flow when the container is half full.

Fig. 5 shows a mixing silo with one above the other in the storage container arranged inserts.

FIG. 6 shows the handling of the inserts from FIG. 5.

7 shows a jacket arranged on the outside of the storage container and a collecting device in the form of a vibrating double funnel .

FIG. 8 shows the development of the storage container from FIG. 7. FIG. 9 shows the development of the outer jacket from FIG. 7

The mixing silo (Fig. 1) essentially consists of three elements: a container or storage container 1, a connecting element 2 with a circular cross-section and a collecting device The container 1 is delimited at the side by a wall 5 and has a filling opening 6 at the top. One arranged in the container 1 Inner jacket 4 is delimited at the top with a helical edge 8. This upper edge 8 forms with the closest part of the

409832/0879

Outer wall 5 has a screw-shaped removal opening 9, which extends over the entire circumference, as if with horizontal hatching is shown. The actual storage room 1 'is in the lower part through the inner frame 4 of the removal opening 9, as well as an upper, formed by the part of the container 1 not covered by the inner jacket 4 horizontal hatching of the removal opening 9 of FIG 2 has been taken over for a symbolic representation of the same removal opening 9. According to Fig. 1 are Also in FIG. 2, the ends of the inner jacket 4 are denoted by the letters X, Y and Z. The triangle XZW, on the other hand, represents an example of a stratification I - V corresponding to the qualities stored in container 1.

The function of the mixing silo according to the invention is now based on "FIGS. 1 and 2" as follows:

The container 1 is filled with product, with different qualities in different quantities being filled into the silo in accordance with FIG. 2. This results in a layer or zone formation over the height of the silo. During the introduction of the first layer I, a part of this product falls over a lower section 8 ^{1 of} the edge 8, from the inner jacket 4 and reaches the collecting device 3 expand.

40983 27 0873

This process is repeated with the subsequent batches II, III, etc. When the silo is full, there is therefore already a fairly good distribution of the batches in the connecting element 2.

The distribution is just slightly falsified, passed through distortion the cone formation.

Since the volume of the storage space 1 'in relation to the contents of the collecting device 3 and the annular connecting element 2 is very high is large, this initial mixing inaccuracy in the neglected in most cases or, if necessary, the incorrect mixture can be returned to the container 1.

With a bulk material there is almost no possibility of pressure energy to convert to speed like a liquid. Therefore, one caused by the pressure of the container 1 falls Disturbance of the vertical movement in the connecting element so that the product is in the connecting element when it is emptied 2 moves vertically, which is indicated by a straight section Ib in FIG. The product always moves when it is emptied vertical, as has already been confirmed by a first test mechanics.

Every Süobauer knows the problem of rat hole formation. The entire contents of a silo or container are supported on the ■ outer wall and floor parts. ^ A product flow only takes place in the smaller cross-section corresponding to the outlet opening

409832/0879

instead, which, however, extends over the entire height of the silo. The product flows from the top, from the product that was added last after.

If a similar phenomenon were to occur in the mixing silo according to the invention as in previously known solutions, the mixing process would be in itself illusory. But the measure, the removal opening to be arranged on the outer circumference of the storage room proved to be very good, especially with poorly flowing products advantageous. The "hold" is withdrawn from the material column in the storage room over the entire circumference, the entire content slips forced, and therefore no fixed channels can form over the height. The product actually becomes taken from the container 1 from a helical zone and fed to the collecting funnel 3 via the connecting element 2. A cross-section is found at the bottom outlet 10 of the collecting device 3 of all batches in the silo.

The individual batches I ... V are in the ^ ig. 2 is drawn unequally high, which in practice is mostly the pail. This is where the advantage of the solution according to the invention comes into its own. Even the smallest layer heights or batches are discharged into the collecting device 3_ in exactly proportion to their proportion in the storage room I ^1.

In the known solutions, the product is known to be relative Openings that are far apart from each other are removed

409832/087 9.

especially the smallest batches taken from the storage room in the wrong proportion. The small batch product lies by chance too much is deducted from one opening; is located on the other hand, if it is between two openings, none of it is put into the collecting funnel.

In this point too, the invention has made great progress. Usually it will be the height of the helical Removal opening 9, respectively. 20 extend over the entire mixing height, i.e. about the height from which the product should participate in the mixture.

In an advantageous A _US embodiment of the invention extends

the opening 9 extends over the entire height of the container 1.

For a container of, for example, 15 meters, this means a height of the screw-shaped removal opening 9 of also 15 meters.

In many cases, the requirement is that when the container 1 is half full, an approximately similar mixing effect is achieved should as with whole filling. In Fig. 3 and 4 a solution for high mixing requirements is shown. Several residual removal openings 21, 22, 23 are below the removal opening 20 have been arranged, which are also arranged in helical lines on the circumference of the storage room 1 '. As long as the product flows downward from the actual removal opening 20, the part directly below is for example the remainder removal opening 23 is not in operation.

409832/0 8 79

In the case of a container with an annular bottom outlet, they move horizontally introduced layers to form a bell-like structure, the tip of which points upwards. The larger the diameter of a Container 1 is in comparison to its height, the more this shifting process influences the mixing quality of the entire system.

It has now been found that the screw-shaped removal opening 9 resp. 20 in combination with a central outlet 7 which can be regulated for the respective product (FIGS. 1 and 3) can have a beneficial effect on the regrouping process.

The lateral removal opening 9 respectively. 20 can successfully eliminate bridging and support effects. The central opening 7 can deliver the goods first brought into the silo into the collecting device 3 with a delay. One brought into the mixing silo. The product batch is continuously reduced in size in the lower part of the container 14 at a relatively low lowering speed, while in the upper part of the storage room I ^{1 it} moves from top to bottom at greater speed and is also continuously reduced in size.

The central outlet 7 can now be dimensioned for batch-wise operation of the mixing silo as well as for the continuous flow principle, that he has very little, for example, about $ 10 of the extraction performance -Opening 2, in the collecting device 3 dispenses.

For this example it can be very advantageous to use the removal opening 9, 20 to be arranged in height so that 10 $ of the silo content get into the container lower part 14 and through the removal opening

409832/0879

- 2ο -

tion 9, 20 is no longer detected, for example by a corresponding dimensioning of the funnel-shaped container lower part 14 (FIG. 1). This gives you ideal ones very quickly Mixing ratios in batch and continuous processes.

In the continuous process, there is always an average mixture of the ^{batches previously present in the storage room I 1} in the container lower part 14, in our example the -5. previous batches available.

Through the removal opening 9, 20 "spherical segment-like" Parts removed from the column of material located in the storage room 1 'in a continuous cycle. Each batch is thus im The scope is continuously reduced by the amount of product withdrawn at another point.

In Fig. 4, the removal openings 21, 22, 23 run in opposite directions Sense to the removal opening 2o. Of course, all removal openings 2o, 21, 22, 23 can now be used in the same way are arranged, similar to FIGS. 5 and 6. In this way, the draw-off ratios are changed, but this depends on the flowability or other behavior of the product can result in advantages.

409832/0879

In the solution according to FIG. 1 as in FIG. 3, vertical guide strips 43 are arranged so that the influence of the flowability does not interfere with the mixing effect can.

In * ig. 4 shows the mode of operation of the partly superimposed removal openings 20, 21, 22, 23 with half the container filling. -The horizontally superimposed zones are marked X, XI, XII, XIII and XIV. ^D ± e diagonal X ¹ , Z ¹ corresponds to the withdrawal opening 20. Below this withdrawal opening 20, the remaining withdrawal openings 21, 22 and 23 are arranged. About the same amount of product can be withdrawn from each of the batches X to XIV via the remainder removal openings 21 and 22. The remainder removal opening 23

4098 3-2 / 0879

is not active when the container is half full, since the product from the part of the removal opening 20 located directly above it sinks very quickly in the connecting element and thus prevents material from entering deeper. The removal opening 20 in the case shown only comes into contact with the product at half height and thus half the circumference. Nevertheless, a proportional amount of product from each of the batches X - XIV is also dispensed into the Sarainel funnel 3 here. In the uppermost part of the remainder removal opening 22 there is "an insignificant falsification of the mixture. If you think that the container 1 is only filled up to and including batch XII, the remainder removal opening 23 also comes into action A third of the filled storage room 1 'is ^{removed from the storage room I 1} through all openings 20, 21, 22 and 23. If the container 1 is completely filled with the batches to be mixed, the remaining removal openings 21, 22 work 23, 23. It is also advantageous to combine this embodiment with a central exhaust duct 7.

5 shows a further very advantageous embodiment. In a container 31, two inserts 32 and 33 are arranged one above the other. Both inserts 32, 33 each contain a helical one Opening 34 resp. 35. The product is connected via a connector 36, which is formed by the two inserts 34 and 35 and the container 31, fed to a collecting device 37, At the same time, a narrow annular gap 38 is provided as a direct connection from the container 31 to the collecting device 37.

409832/0879

To ensure that no material remains on the bottom of the container, the point in the lower part of the container is pointing upwards teter body 39 is arranged. The collecting device 37 can be mounted on damping elements, not shown, and with a Vibration exciter 40 are set in vibration. With this device, known per se as a discharge aid, the finished Mixture of difficult flowing bulk materials discharged through a small opening 41 of a flat sloping floor will. A conical hood 42 forms an upper end of the connecting element 36. The first mismixing can occur with this Solution can be reduced to a minimum.

The openings 34 and 35 are expedient in most cases chosen to be slightly smaller than the circular ring area of the Connecting element 36, which is located between the storage container 31 as well as the two inserts 32 and 33 results. Are the areas of the openings 34 and 35 together approximately as large as the one mentioned above As a first approximation, the same extraction rate can be assumed for both openings 34, 35. Of course these cross-sectional ratios must match the respective flow properties of a product can be adjusted. For example, the openings 34 »35 of the individual can also be placed one above the other set inserts 32 and 33 may be different.

The installation of whole inserts 32, 33 has the particular advantage that different mixing silos can be built with a relatively small number of basic elements. If the customer is for

40 9 8 32/0879

If any task only wants to have a rough mixing effect, he could, for example, order a silo with only one insert with this solution, so that the removal opening, for example, only extends over the bottom third of the silo. Of course, the free opening between the highest insert and the wall of the container 1 must be blocked for the passage of material. If the customer realizes in the course of time that he would like to have the mixing effect over a greater height in the silo itself, a second or third insert with possibly smaller removal openings is simply placed over the first one. In this solution, the actual storage space I ¹ is delimited by the container 31, minus the contents of the connecting element 36.

The structural design of the removal opening 34, 35 for Connecting element 36 can in terms of strength are of great importance. The two inserts 32 and 33 show as shown again in FIG. 6, one slot-like each Opening 34 resp. 35, in contrast to the solutions shown in FIGS. 1 and 2, where the removal opening 9 through the upper edge of an inner jacket 4 and the correspondingly closest wall portion of the container 1 is formed.

In the - ^ ig. 7, 8 and 9, a further possibility of the structural design of the removal opening is shown. To NEN egg container 50, a sleeve 51 is arranged. The gap

409832/0879

between the jacket 51 "and the container 50 together form a Connector 53.

The development of the cylindrical part of the container 50 is shown in FIG. 8, and the development of the jacket 51 in FIG. Withdrawal openings 52, 52 /, 52 ″ are provided in this embodiment in the container 50. It is only a structural one Ask whether: one or the other variant is chosen. In any case, the basic principle of the invention Solution not deviated. In all solutions, the removal openings 52, 52 ', 52 "can be parallel, with different Inclination angle or with opposite directions of rotation to each other.

7 further shows the use of a collecting device in the form of a vibrating double funnel 54. With this solution the amount of the central opening can be varied very easily by a main dosing separator 57 Backwater is generated. The product quantities can vary exactly according to the area ratios of the inner respectively. outer outlet part of the vibrating double funnel 54.

In Fig. 7 there is still another design concept in the form of a product distributor at the silo entrance.

A hood 58 is arranged a little below the inlet opening, which could also be replaced by other means that ultimately only have the task of placing the product close to the outer wall.

AO 9 832 / .08 7 9

fall so that a stratification, with downward facing Bell shape 59 is created. When dispensing, an upward-pointing bell shape is created, so that the mixing effect is added can be improved.

The double funnel 54 or the hood 58 can of course also be used in all embodiments of the invention, in particular also in the I ¹ Ig. 3 ·

-It is conceivable that, for purely structural reasons, the walls of the container and connecting element by not shown Cams or by a large number of short but interrupted vertical or slightly inclined strip pieces 43 or 45 are connected.

All parts of all silos must meet the structural requirements correspond, which of course must not be prevented by the helical removal opening.

For example, it would also be conceivable in the helical Opening several relatively large interruptions so that the silo wall gets the necessary strength.

In the case of very large silos, it might be conceivable that these Interruptions take up about $ 20-30 of the total opening, so that, assuming an acceptable flow form, the interruptions for the function nitht ins. Weight "fall. . "409832/0879

Claims (18)

Expectations Mixing silo with a storage room or storage container and a collecting device arranged underneath, as well as a Connection element for simultaneous continuous removal of flowable bulk material from different heights of the storage room or storage container and mixing it in the collecting device using gravity, thereby characterized in that between the storage container or storage space (1; 1 '; 31; 5o) and the connecting element a removal opening (9; 2o; 21; 22; 23; 34; 35; 52; 52 '; 52 ") helically on the outer circumference of the storage space or storage container is arranged and the connecting element (2; 36; 53) has a smaller cross section than the storage container or storage room. 2. Mixing silo according to claim 1, characterized in that that the removal opening (9; 2o) extends in one revolution over the entire height of the container (1; 1 '). 3. Mixing silo according to claim 1 or 2, characterized in that that the removal opening (9, 2o, 34, 35, 52) has short interruptions. 409832/0879 4. Mixing silo according to claim 1 or 3, characterized in that several helical removal openings (2o; 21; 22; 23; 34; 35; 52; 52 '; 52 ") on the outer periphery of the storage room (I ¹ ; 31; 5o) are arranged one above the other. 5. Mixing silo according to claim 4, characterized in that each higher-lying removal opening (2o; 34; 52) one has a smaller cross-section than the area of the lower-lying removal opening (21; 22; 23; 35; 52 '; 52 "). 6. Mixing silo according to one of claims 1 to 4, characterized in that below the removal opening (9; 2o; 52) one or more helical remainder removal openings (21, 22, 23; 52 ¹ , 52 ") are arranged, which can run parallel or with different angles of inclination, or with opposite directions of rotation to one another or to the removal opening (9, 2o, 52). 7. Mixing silo according to one of claims 1 to 6, characterized in that the removal opening (52, 52 ¹ , 52 ") is arranged in the wall of the container (5o). 8. mixing silo according to claim 7, characterized in that the one removal opening (52) containing the wall of the Container (5o) together with a jacket (51) forms a connecting element (53). 409832/0879 9. Mixing silo according to one of claims 1 to 6, characterized in that inserts (32, 33) are arranged in the container (31) are, in each of which at least one removal opening (34, 35) is arranged. 10. Mixing silo according to one of claims 1 to 6 or 9, characterized in that an insert (4) is arranged in the container (1), the upper of which extends helically Edge (8) together with the nearest wall part of the container (1) forms a removal opening (9). 11. Mixing silo according to one of claims 1 to Io, characterized in that at least one central exhaust pipe (7; 38; 55) is arranged ^{in the lower part of the container (1; I 1; 31; 5o).} 12. Mixing silo according to one of claims 1 to 11, characterized in that the collecting device by a vibrating Double funnel (37, 38; 54, 55) is formed. 13. Mixing silo according to claim 11 and 12, characterized in that the central exhaust pipe (38; 55) than the inner one Funnel of the double funnel is formed. 14. Mixing silo according to one of claims 11 to 13, characterized characterized in that the central exhaust pipe (7) has a power control element (13). 409832/0879 15. Mixing silo according to one of claims 11 to 14, characterized in that the discharge pipe (38; 55) has an annular Has cross section. 16. Mixing silo according to one of claims 1 to 15, characterized in that the connecting element (2; 36; 53) is vertical or slightly inclined strips (43; 45). 17. Mixing silo according to claim 16, characterized in that the strips (45) excellently against the screw lines Removal opening (35) are slightly inclined. 18. Mixing silo according to one of claims 1 to 17, characterized characterized in that the removal opening (9, 2o, 34, 35, 52) has an increasing or decreasing cross-section from top to bottom having. 4C9832 / 0879 Blank page