DE2355353A1 - Mixer for synthetic resin raw materials - with connected mixing zones, central stirrer, and separating intermediate bodies - Google Patents

Abstract

Appts. for mixing powdered, paste-like, granular, liq. or fibrous matl., esp. for converting synthetic resin raw matls. into granules consists of a vertical cylindrical container with connected mixing zones in which a central vertical shaft with mixing discs rotates, and disc-shaped, coaxial intermediate bodies that separate the mixing zones, and are arranged on a ring seated on the inner wall of the container cover. Between the ring and the outer edge of the intermediate bodies is situated a split that can be opened and closed, or adjusted to a desired size by relative movement of the split-forming parts. Residence time of the matl. in the mixing zones can be accurately controlled. Completely automatic mixing can be obtd.

Description

^f he <y9örner & ^) vey

MUNICH 22 · WIDENMAYERSTRASSE 49 1 BERLIN-DAHLEM 33 ■ PODBIELSKIALLEE 68

BERLIN: DIPL.-ING. R. MÜLLER-BÖRNER MUNICH: DIPL.-ING. HANS-H. WEY

zk 965

Günther Papenmeier KG Machine and apparatus construction 493 Detmold 18

Device for treating mixed material, in particular for processing plastic raw material

The invention relates to a device for the treatment of powdery, pasty, granular, liquid, gel-like, fibrous, powdery or other flowable Mixing material, especially for processing plastic raw material, E.g. to a granular agglomerate, with several one behind the other arranged one above the other Mixing zones in which at least one mixing tool driven by a central vertical shaft is arranged.

A spray mixer is already known, with which liquids to powdery or fine-grained products are added continuously. This mixer has a

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vertical cylindrical jacket, in the interior of which a motor-driven hollow shaft rotates, on which several centrifugal plates are arranged at a distance from each other.The material to be wetted is conveyed on the centrifugal plates from the inside to the outside and guided inwards by means of conical guide plates in order to reach the to drop the next lower plate. ¥ hile the passage of the mixture through this spray mixer on the shaft is arranged nozzles the liquid out radially from the inside outwards against the mixing crediting lyre sprayed (Chemie-Ing.-Techn. 39, I967 "S. 137 ¹ O °

Furthermore, a similarly constructed mixer for the purpose of continuous mixing has become known. at Several rotating plates, which can have a wide variety of shapes, sit on a vertical axis. The mix is fed to the rotating mixing plates close to the axis and through them to the outside against the inner wall of the housing shell, the mixing of the components of the material being mixed should take place. Conical Guide plates guide the mix back to the center (dt-os 1 557 144).

The previously known apparatuses are possibly suitable for mixing certain components of a material to be mixed, in particular when the equipment is tailored to the specific purpose, i.e. the construction the apparatus and its dimensions are determined by the mixing data in question. A universal one However, these devices cannot be used because they can only be adjusted and adjusted to an extremely limited extent are adjustable. In particular, the residence time of the

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Do not influence the mix in the apparatus or only influence it to a very inadequate extent. But this is often a decisive factor for achieving a very specific result when mixing »This is what matters, for example in the treatment of plastic raw material especially which is to be processed for the purpose of specific further processing «

The invention is based on the object of a device To create for the treatment of mixed material, which makes it possible in particular to make the mixing process very specific affect, especially with regard to the treatment time of the mix.

To solve the problem, it is proposed according to the invention, to design a device of the type under consideration for mixing or treating mixed material in such a way that that the individual mixing zones arranged one above the other in the mixing container are formed by disc-shaped, coaxial arranged intermediate bottom are separated from each other, at the height of which rings are arranged on the inner wall of the container are, between which and the outer edge of the floors there is a gap, which is caused by the relative movement of the gap-forming elements to each other in any desired size between a zero and a maximum value is adjustable and can be opened or closed.

By such a design, the device is divided into vertically superimposed zones with respect to which the dwell time of the mix can be regulated as required is by opening the gap through which the mix enters the

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reaches the next deeper zone, opens to a greater or lesser extent or opens and closes periodically. That's how you got it in hand, the process flow in any desired to steer quietly,

For the purpose of controlling the process, either the intermediate floor between the individual mixing zones along the axis of the vertical shaft of the mixer opposite the rings on the inner wall of the container or the Rings on the inner wall of the container opposite the intermediate floor be mounted adjustable in height. The drive means or elements are advantageously from a central Control unit controllable so that a completely automatic sequence of the mixing process can be achieved.

Advantageously, they are arranged on the mixer shaft Intermediate floor designed as mixing tools or occupied with mixing tools.

In a preferred embodiment is immediately below the plate-shaped mixing tools have a height-adjustable one Arranged intermediate floor, which the outlet opening of the mixing zones opposite the ring on the inner wall of the container controls.

However, according to another embodiment, it is also possible the intermediate floor or the intermediate floor plate-shaped mixing tools firmly on the drive shaft to attach and to adjust this axially together with the intermediate floor to the outlet openings of the to control individual mixing zones.

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If the intermediate floors are individually axially adjustable on the shaft, it is possible to design the process sequence more individually and to better adapt the mixing process in individual phases to the requirements that arise in particular from the nature of the material to be mixed. For the adjustment of the individual shelves you can
a wide variety of constructive solutions are used;
it can be done hydraulically or pneumatically or mechanically,

In a likewise very advantageous embodiment, either only the rings are on the inner wall of the container
or, if necessary, the rings and the intermediate floor are also axially adjustable. The constructive solutions for adjusting the rings sitting on the inner wall of the container are compared to the mechanical ones for adjusting the
Intermediate bottom certain cases easier and less
expensive, especially if the device contains a large number of mixing zones. The rings can also be displaced hydraulically or pneumatically as well as mechanically in a simple manner.

For special applications it can be advantageous to provide a collecting chamber for the material to be mixed below each mixing zone or only by certain mixing zones; this collection chamber
is used to temporarily pick up the material to be mixed
the discharge from a mixing zone and before entering the next mixing zone, in order to prevent the mix treated in one mixing zone from mixing with the mix in the next mixing zone. This is supposed to

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prevent mixed material that has not been adequately treated from being passed through the device too quickly will. This achieves a better homogeneity of the mix at the end of the treatment,

In FIGS. 1 to ^{1 of} the drawings, the subject matter of the invention is illustrated with the aid of some particularly preferred exemplary embodiments, which are explained in more detail below. Show it:

1 shows a view of the device designed according to the invention in perspective view;

FIG. 2 shows an axial section through part of the device according to FIG. 1 in the area of one opposite in height the surrounding ring adjustable intermediate floor between two superimposed mixing zones;

3 shows an axial section through part of a device, in which, however, the one surrounding the intermediate floor Ring is designed to be adjustable in height with respect to the intermediate floor;

Figo h and 5 each have an axial section through part of a device, similar to that of FIG. 1, in which below the mixing tools in each of the

Mixing zones height-adjustable intermediate floors are provided;

6 shows an axial section through part of a device, similar to that according to FIG. K, in which the intermediate floor has no connection with the shaft;

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7 shows an axial section through part of a device in a modified design, in which each A mix collecting chamber is assigned to the mixing zone.

As can be seen from FIG. 1, there is the one designed according to the invention Device essentially consists of a vertical cylindrical container 11, which is on a base frame 12 is seated and supported by a frame 13. The container jacket is used for inspection and cleaning purposes 14 of the cylindrical container 11 formed in two parts, that is, the front half of the container wall 1-4 of the device shown in Fig. 1 can be opened like an arched door is. It can be advantageous here to divide the pivotable container wall part 14 into several parts 14a, 14b, 14c subdivide so that after opening one of these shell parts, the mixing zone A, B or C behind it is accessible. Inside the container 11 there is one vertical through shaft 15 »with its lower end in a bearing, not shown, which is attached to the base frame 12, and with its upper end in the Bearing 16 is mounted, which is attached to the frame 13 worn yoke 17 sit.zt. The wave is from the one on the Base frame 12 attached drive motor 18, for example Set in rotation via a V-belt drive. The upper part of the cylindrical container 11 is formed by a lid 19 » which at the same time closes the upper mixing zone at the top. In the cover 19 there is an inlet connection 20 for the Introduction of the material to be mixed into the upper mixing zone A. At the lower end of the cylindrical container 11 is located a base piece 21, which contains the outlet channel for the material to be mixed, which opens into the outlet nozzle 22. Fig. 1 is only intended to show the general structure of the invention

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according to the trained device can be recognized without that it depends on constructive details.

In a mixing device designed according to FIG. 2, the individual mixing zones A, B and C are arranged on the central ¥ elle I5 against each other or against the bottom piece 21 delimiting intermediate bottom 3I, the diameter of which is smaller than the inner diameter of the cylindrical container shell 14. In this embodiment If the intermediate floor is also designed as a mixing tool, ie wing-shaped tools 32 are arranged on it, which cause a corresponding circulation of the mixed material in the mixing zone A. On the inner wall of the container jacket 14, at the level of the intermediate base 31, there is an inwardly projecting ring 33 with an approximately triangular cross-section. The ring 33 protrudes so far inwardly against the disk-shaped intermediate base 31 that there is only a small gap between the two parts. The shaft 15 with the intermediate floor 3I is mounted so as to be axially displaceable. On the right-hand side of FIG. 2, the intermediate floor 31 is located at the level of the ring 33t seated on the inner wall of the container jacket Ik , so that the upper mixing zone A is closed off from the mixing zone B located below the intermediate floor 3I. On the left-hand side of FIG. 2, the shaft I5 and the intermediate floor 3I are shown in a descending position, so that between the upper edge 3 ^ - of the intermediate floor 31 and the inner edge 35 of the ring 33 there is a gap 36 through which the mix can pass can pass from the upper mixing zone B.

The size of the gap 36 can be regulated in that the shaft I5 and thus the intermediate floor 31 or more be lowered less far down. Operation of the

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The device can be implemented in such a way that either the gap 36 is constantly set to a certain size so that the material to be mixed continuously passes through the device, although it is circulated and treated in the individual mixing zones for a certain period of time, or that the gap 36 is periodically opened and closed again depending on the state of the mix.

In the device formed according to FIG. 3, the shaft is 15 '' on which the intermediate floor 31 ', designed as a mixing tool, sit, cannot be displaced in the axial direction On the other hand, those on the inner wall of the Container jacket 14 'arranged rings 41 with approximately triangular Cross-section, which correspond to the stationary rings 33 in the embodiment according to FIG. 2, in their height position movable between two end positions in order to open a gap 42 between the outer circumference of the disk-shaped intermediate base 31 'and the ring .4-1 to a greater or lesser extent or to close. On the ring 41 sits a one running around it Flange 43, which is in an annular groove 44 in the Wall of the container jacket 14 * is. The annular groove 44 is dimensioned so wide that the flange 43 is a sufficiently dimensioned Play in the axial direction has to move it up or down between two limit positions can. This is done, for example, by introducing a pressure medium into the space 45 above or into the Space 46 below the flange on the ring 41. In such a In the construction, the annular spaces 45 and 46 must of course be adequately sealed from the outside. Instead of a print medium can be used for the same purpose also use vacuum "

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As can be seen from FIG. 4, it is not absolutely necessary to design the intermediate floors between the mixing zones as mixing tools. In this embodiment, underneath the plate-shaped mixing tools 51, which reinforcement elements 52 are fixed, are arranged in their height position and axially displaceable intermediate floor 53 with respect to the shaft 52. In the upper half of FIG. 4, the gap 54 between the outer edge 55 of the intermediate floor 53 and the inner edge 56 of the ring 57 seated on the inner wall is closed ₉ , that is to say that the intermediate floor 53 is in its upper end position. In the lower half of FIG. 4, the intermediate floor 53 is shown lowered downwards, so that the gap 54 is opened to a certain extent, so that mix can pass from the mixing zone B into the mixing zone C. In order to be able to adjust the intermediate floor 53, a flange 59 seated on a sleeve 58 connected to the shaft 52 engages in an annular space 60 in the intermediate floor 53, by which this is divided into an upper space 60a and a lower annular space 60b. Via the pressure medium lines 6i or 62, a pressure medium can be introduced either into the upper annular space 60a in the intermediate floor 53 or into the lower annular space 60b, as a result of which the intermediate floor is either raised or lowered.

In the embodiment according to FIG. 5, the intermediate base 71 is axially displaceable below the plate-shaped mixing tool 72 with respect to the ring 73 seated on the inner wall of the container jacket 14. The ring 74 of the intermediate floor 71 sits on the one hand on an annular membrane 75 1 which is fastened with its inner circumference on the shaft J6 and with its outer circumference on the ring 74 _o The space 77 under-

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half of the diaphragm 75 is closed by a rolling diaphragm 78 and is supported by the flange 79 seated on the shaft 76. A pressure medium can be introduced into the interior 77 via the line 80 in the shaft 76 in order to move the intermediate floor 71 in the axial direction.

Instead of a hydraulic or pneumatic drive means for moving the axially displaceable intermediate floor or rings, mechanical means can be used in a simple manner, as can be seen from FIG. 6. The intermediate base 83, which is axially displaceable beneath the mixing tool 82 seated on the shaft 81, is supported by struts 84, at the ends of which there are pegs 85 which are arranged in vertical slots 86 in the container casing 14 ″, so that the struts 84 and with them the base 83 are movable up and down · the slots 86 through to the struts 84 fitting plates 87 are covered. on the pin 85 seated rollers 88, which lie in a control groove 89 of the container casing 14 ^H comprehensive control ring 90. the control ring 90 is on the container shell 14 ″ fixed by upper and lower bearing pieces 91 and 92 and rotatable between them in the circumferential direction. Upon rotation of the control ring 90, the rollers 88 by the cam grooves 89 or upward _o to move down and with it the pin 85 and the struts 84 and the intermediate bottom 83rd

In the same way, the drive mechanism for the rings can be formed on the inner wall of the container jacket be when they move the false floor opposite are.

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If the slots 86 in the container jacket 14 ″ for the passage of the pegs 85 are not as in the exemplary embodiment Fig. 6 executed axially parallel, but inclined, so a control ring can be attached directly to the pin, in the rotation of which the pin can be moved upwards or downwards.

Since it is advisable in particularly stored cases to let the mix run through the device periodically, ie to treat the mix in each mixing zone specifically up to a certain degree of preparation, in order to then transfer it to the next mixing zone, which in this case is already emptied must be, it is advantageous, as shown in FIG. 7, to arrange a collecting chamber S underneath each intermediate floor 101, which temporarily receives the mixed material until the next lower mixing zone is emptied. For this purpose, a further intermediate wall 102 is provided, which is expediently designed to be conical and which has a central opening 103 which can be closed by the ring slide 104. The ring slide 104 is connected to a shift rod I06 in the interior of the hollow shaft 107 via a bolt 105. The bolt 105 lies in a slot 108 of the hollow shaft 107, so that the ring slide 104 can be moved upwards or downwards in order to open or close the outlet opening 103 of the collecting chamber S. Independently of the switching rod IO6 or the ring slide 104, the shaft I07, on which the intermediate floors 101 are fixedly arranged, can be moved axially in order to open the gap 109 for the mixed material to pass from the mixing zone A ¹ into the collecting chamber S. This makes it possible to transfer the material to be mixed from the mixing zones A ¹ or B ^f into the collecting chambers S located below them and after them

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Emptying the mix from the Samrael chambers S into the to let the underlying mixing zones run in.

In practice, in a mixing device according to the invention, the most varied of options previously indicated for controlling the process sequence with regard to the treatment of the material to be mixed can be provided. This is because, as a rule, each mix has to be subjected to a specific treatment in order to be able to obtain a product of the best possible quality in the end. This means, for example, that in the device not only the height of the intermediate floors can be adjusted, but also the rings surrounding them and arranged on the inner wall of the container frame, if necessary individually adjustable and controllable between each two mixing zones ₀ A device designed in this way enables the mixed material to be treated in any desired manner, whereby a tool adapted to this must naturally be provided for each specific treatment and, on the other hand, the treatment process can be carried out either continuously or in discontinuous operation, choosing the most appropriate method in each case

self
is practically determined by the mix or by the way it is treated. A mixing device according to the invention is particularly suitable to be used instead of the high-speed mixers, which previously worked discontinuously and batchwise, for processing plastic into a further processable granular agglomerate.

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Claims (10)

Expectations 1. Device for treating powdery, pasty, granular, liquid, gel-like, fibrous, powdery or other flowable mix, in particular for the preparation of plastic raw material, Consists of a vertical, cylindrical container with several, one behind the other and one on top of the other arranged mixing zones, in which a motor-driven central vertical shaft with rotating plate-shaped mixing tools, characterized in that that the individual zones (A, B, C etc.) through disc-shaped, coaxially arranged intermediate floors (31, 31 '; 53; 71; 83; 101) separated from each other are, at the height of which on the inner wall of the container shell (14) seated rings (44; 57; 73) are arranged are, between which and the outer edge of the There is a gap (36; 42; 54; I09) in the intermediate floor, due to the relative movement of the gap-forming elements (31.34: 33.35; 31 *: 41; 53.55: 57.56; 71:73) is adjustable to each other in any desired size between a zero and a maximum value and is open or can be closed. 2. Device according to claim 1, characterized in that the intermediate floor (31; 53; 7I; 83; 101) longitudinally the axis of the vertical shaft (15; 52; 76; 81; 107) are height-adjustable in relation to the rings (33 »57» 73) on the inner wall of the container » 509820/0516 3. Device according to claim 1 or 2, characterized in that the rings (41) on the inner wall of the container jacket (14 ·) adjustable in height relative to the intermediate shelves (31 ') are stored. 4. Apparatus according to claim 1, 2 or 3 »characterized in that the intermediate floor (31; 31 '; 101) attached to the mixer shaft (15; 15 ^f ; 107) and at the same time designed as mixing tools or are occupied with such. 5. Device according to one or more of claims 1 to 4, characterized in that the intermediate floor (31; 101) sit firmly on the drive shaft (15; 107) and that this is axially adjustable " 6. Device according to one or more of claims 1 to 5 »characterized in that immediately below of each plate-shaped mixing tool (5I; 72 » 82) a height-adjustable intermediate floor (53; 71; 83) is arranged with an adjustment mechanism assigned to this is. 7. The device according to claim 6, characterized in that on the ¥ elle (52) flanges (59) are arranged, which lie with axial play in an annular space (60) in the intermediate base (53), and that in the space (60a ; 60b) a pressure medium can be introduced above or below the flanges (59) for changing the position of the intermediate floor (53) in the axial direction. 50 98.20 / 05 1-6 8. Apparatus according to claim 6, characterized in that that the intermediate floor (71) between each two on the Shaft (76) seated flanges (79; 72) or the like. axially displaceable and between the floors and the Splash flexible membranes (75 »78) or the like. are arranged and that in the completed by this Spaces (77) a pressure medium or vacuum can be introduced. 9. Apparatus according to claim 6, characterized in that that the intermediate floors (83) are supported by struts (84), the pins of which are seated at the outer ends (85) passed through slots (86) in the container jacket (14 ") are and carry rollers (88) which are in control grooves (89) of a surrounding the container jacket, rotatably mounted control ring (9O) lie. 10. The device according to claim 3 »characterized in that that the height-adjustable rings (41) mounted on the inner wall of the container with an outer one in a groove (44) in the container wall (14 ·) engaging flange (43) are provided, and that in the space (45; 46) Above or below the flange (43) a pressure medium for changing the position of the ring (41) in the axial direction Direction can be initiated, ο Device according to claim 3, characterized in that that the rings mounted on the inner wall of the container are carried by pegs that protrude through inclined slots in the container jacket and outwards a rotatable control ring surrounding the container jacket are attached. 509820/0516 12o device according to one or more of claims 1 to 11, characterized; that below each mixing zone (A ₁ B, C etc.) or an intermediate floor (101) or only some specific one of a further floor (102) formed collecting chamber (s) for the mixed material is located, in the bottom (102) of which at least one outlet opening (I03) controllable by a closure member is arranged. 13 · Device according to one or more of claims 1 to 12y, characterized in that the control of the intermediate floors or the rings between the individual mixing zones (A, B, C etc.) as a function of a certain material condition of the material to be mixed, in particular as a function of whose temperature and or ₀ or is controlled by the predetermined dwell time of the material to be mixed in the individual mixing zones. 509820/0516