DE102018002474A1 - Mixing device for fibers or chips and binders - Google Patents

Abstract

The invention relates to a mixing device for continuously mixing fibers or chips with a binder for the production of fiber or chipboard, wherein the mixing device at least one of a scaffold (15, 16, 17) supported mixing chamber (1) and therein a plurality of rotatable Mixer shaft (2) fixed mixing or conveying tools (3, 8, 9, 10). In order to provide a mixing device for fibers and glues, which is easier to maintain when used at higher temperatures curing glues, it is provided that on the outer surface of the mixing chamber (1) cooling channels (26) of semi-finished products with at least one coolant inlet (28) and a coolant outlet ( 29) are mounted.

Description

The invention relates to a mixing device for the continuous mixing of fibers or chips with a binder for the production of fiber or chipboard, wherein the mixing device comprises at least one mixing chamber supported by a framework and therein a plurality of mixing or conveying tools attached to a rotatable mixer shaft.

Such mixing devices are also referred to as gluing mixers. The mixing chamber is generally cylindrical in shape as a drum, but this drum is not rotated, but is fixed and only the mixer shaft rotates with the mixing or conveying tools.

The gluing of fibers or chips and consequently the mixing of fibers or chips with a binder or glue represents an essential process step in the course of the production of fiber or chipboard. The quality of the plates produced, for. B. wood-based panels or in particular also material plates from the fibers of the straw of annual plants, also depends significantly on the quality of the fibers and in particular a homogeneous gluing of the fibers. In the following, the description of the invention focuses on the mixing of fibers and binder, but this does not exclude the use of chips instead of fibers.

It is basically known to mix fibers in a so-called blowline with a binder or glue and thus to glue. However, the throughputs are limited in this gluing technique. Incidentally, in practice occasionally problems with so-called Leimflecken occur. In particular, the handling of isocyanate binders is causing problems in blow-by technology.

For this reason, the gluing of fibers in a gluing mixer has already been proposed. However, the results obtained in the past in practice with known blending mixers have often been unsatisfactory. Isocyanate binder, for example, hardens at a certain temperature, which may already occur in the mixer.

A device for the continuous gluing of fibers, which is designed as a horizontally oriented gluing mixer drum-like, is for example from DE 24 38 818 known. The mixing shaft is hollow in this embodiment and serves the glue supply. For this purpose, the mixer shaft is occupied with mixing tools, which are provided in the region of their hollow training with it from glue spreading tubes. The diameter of such a mixing container is about 600 mm, wherein a rotational speed of the mixer shaft of 1500 revolutions per minute is proposed. This is to achieve a throughput of 3 to 4 t fibers per hour.

In practice, care has been taken so far in the gluing of fibers with such devices that the fibers to be glued, which are set by the mixing tools in a "rotating" movement, have a predetermined speed or peripheral speed.

From the DE 10 2009 057 916 B4 but it is also already known that preferably a high centrifugal acceleration of the fibers in the region of the mixer inner wall in the order of 10,000 to 30,000 m / sec ^{2 can be selected} with a correspondingly matched ratio of speed and diameter of the mixing chamber. This significantly improves the mixing ratio.

The mixing chamber has at least one loading opening for the feeding of the fibers and at least one discharge opening for the discharge of the fiber-binder mixture and a plurality of binder feed openings for the supply of the binder. The invention according to the DE 10 2009 057 916 B4 proposes that as mixing tools a plurality of spiked combs distributed over the circumference of the mixer shaft are provided, each with a plurality of radially outwardly oriented spines, wherein the spiked combs extend substantially parallel to the mixer axis and wherein each two adjacent spiked combs offset in the axial direction by a predetermined amount to each other are arranged. These spiked combs or spikes take on the one hand a mixing function and on the other hand a conveying function, because in rotation of the mixer shaft with the mixing tools, the fibers are not only mixed with the binder, but the mixture is transported simultaneously in the conveying direction of the loading opening to the discharge properly and with high throughput , Due to the axial offset of the individual spiked combs one achieves a spiral arrangement of the spikes, which improves the conveying effect. The individual spines can also be referred to as spines or pins. It is also known to use shovel-like conveying tools instead of these pins, in particular in the vicinity of the loading or unloading opening. The spines, pins, thorns and blades are to be referred to in the following simplified as mixing or conveying tools

Nevertheless, this embodiment, which has been tried and tested successfully, also has disadvantages which Primarily found in complicated maintenance.

The high speeds and centrifugal accelerations are partly responsible for high temperatures in the mixer. This creates the risk that at higher temperatures quickly curable glues and binders, such as isocyanate, cause damage in the mixing chamber. Incidentally, other suitable binders would be primarily methylene diphenyl isocyanates, urea formaldehydes, phenolic resins and the like. Ä. The mixing chamber must then be cleaned during a production standstill with great effort.

The mixing chamber inner wall and the tools are also subject to high wear, depending on the fiber and binder material. For this purpose, it is already known to use wear-resistant materials for the mixing chamber and the tools. However, a repair or replacement of these parts is relatively often necessary, which also leads to a loss of production.

The invention has for its object to provide a mixing device for fibers and glues, which is easier to maintain when using at higher temperatures curing adhesives.

The object is achieved with the features of claim 1 and in particular by the fact that on the outer surface of the mixing chamber cooling channels of semi-finished products are mounted with at least one coolant inlet and a coolant outlet.

On the one hand, the mixing chamber can be easily cooled in this way, so that premature curing of binders can be suppressed. The cleaning work in the mixing chamber are thereby reduced.

On the other hand, with an expansion of the mixing chamber from the mixing device, the cooling channels can be removed with the same and maintained or replaced.
And it is particularly advantageous that it is obtained in the continuous supply of coolants that keeps the inner surface of the mixing chamber so cool that moisture condenses there from the air and form a moisture film. This also prevents setting and curing of the binder on the inner surface of the mixing chamber. Experiments have shown that even at very high revolutions of the mixer shaft and associated with high fiber flow friction, a coolant inlet temperature, in this case of water, of less than 15 ° sufficient. Since the cooling channels consist of semi-finished products, that is to say, for example, of tubes, profiles or bent metal sheets, an inexpensive and rapid production of the mixing device and in particular of the mixing chamber is possible.

The mixing device according to the invention is suitable with its cooling of the mixing chamber, first of all for the gluing of fibers, for. B. for MDF production. Within the scope of the invention, fibers of annual plants, eg. B. fibers of straw, z. B. rice straw, glues. In particular, in such fibers of annual plants isocyanate or an isocyanate-containing binder is used as a binder. This binder is particularly useful for such annual plants because some annual plants are often provided with a wax layer. The high adhesive effect of isocyanate-containing binders nevertheless ensures perfect processing.

Surprisingly, the mixing device according to the invention is also particularly well suited for the mixing of fibers and in particular fibers with thermoplastic synthetic fibers, for. B. bicomponent fibers.

As described, the residues of the binders in the mixing chamber can be removed satisfactorily without having to interrupt the production process in the longer term.

With very particular advantage is associated when the mixing chamber comprises two curved and connectable half-plates made of sheets.

The mixing chamber is then divisible and the mixer shaft with its tools and the inner peripheral surface of the mixing chamber are freely accessible, which greatly simplifies any maintenance.

In parallel, it is advantageous if the framework is divided into an upper and a lower frame, and in particular when the half-shells are supported in an upper frame part and a lower frame part and optionally, when the upper frame part and the lower frame part via a hinge connected to each other.

Then, the upper and lower frame part, which may be formed, for example, similar to a receiving tray for the half-shells, with the half-shells hinged.

If this unfolding is made possible, for example, by more than 90 °, preferably even by 180 °, one obtains the particular advantage that the half shells of the mixing chamber can be removed from the upper frame part and / or the lower frame part.

In this case, for reasons of maintenance shortening even a half shell with signs of wear can be completely replaced. This results in the particular advantage that you do not have to change the entire mixing chamber in case of maintenance, but only takes a half-shell from the associated frame part. Connected with it also removes the cooling channels which are thus easily accessible maintenance.

It is advantageously provided that the cooling channels are arranged meander-shaped on the outer peripheral surface of the mixing chamber.

This can be, for example, two independent cooling circuits, one on each half shell. In many cases, it is even advantageous if more than two cooling circuits are provided, for example two on each half-shell, to have a lower inlet and an upper outlet on each side.

Preferably, a cooling channel is formed from at least one coolant channel leading first channel portion, a deflection and at least one immediately adjacent returning second channel portion.

In total, two parallel channel sections can extract approximately the same amount of heat at each point. The coolant, usually water, flows cold into the first channel section at the coolant inlet and warms up on its way through the cooling channel. At the coolant outlet of the second channel section, it is warmest and can absorb only small amounts of energy. In sum, the energy consumption at each point of the two channel sections considered together is about the same.

Preferably, the cooling channels run meander-shaped so that the first channel portion and the second channel portion are arranged in the axial direction of the mixing chamber.

The coolant flow direction thus extends substantially either in or against the conveying direction of the material, so that the heat absorption into the cooling liquid is distributed relatively uniformly over the entire length of the mixing chamber.

Most preferably, a part of a cooling channel is formed by the outer peripheral surface of the mixing chamber.

The cooling liquid thereby has direct contact with the outer peripheral surface of the mixing chamber and the heat transfer value by convection is further improved. In experiments, it has been found that a channel shape is particularly effective, consisting of a quarter tube, ie a longitudinal section through the 12 o'clock point and the 3 o'clock point or 9 o'clock point of the cross section, with his thighs on the Outside surface of the mixing chamber attached (welded, glued or screwed) is. The channel then keeps the jacket very flat and yet has a particularly good heat transfer surface.

It is advantageously provided that a cooling channel is releasably secured on the outer peripheral surface of the mixing chamber. With a maintenance replacement of a half shell, the cooling channels can be easily removed and reused.

In order to easily maintain and replace the mixing or conveying tools, if they are polluted by the cured binder or damaged by abrasion of the fibers, it is preferred if the mixer shaft has partially covered grooves in which movable sliding blocks are arranged, the can be connected with a mixing or conveying tool.

Therefore, the mixer shaft according to the invention is provided with partially covered grooves in which a sliding block can be moved, which receives a tool. By partially covered grooves are therefore to be understood grooves that have an opening width to be able to pass through an end of a tool can. Partially covered, however, also means that the groove widens radially inward, so that a sliding block adapted to the expanded cross-section can not fall out upon rotation of the mixer shaft. The sliding block can therefore only be inserted from one end of the mixer shaft or an extension hole in the groove and under the cover.

Preferably, these mixing or conveying tools are also formed in the context of this invention without binder feed, d. H. the binder is not supplied via the mixing or conveying tools themselves, but via separate (non-rotating) binder feed tubes, which in z. B. radial direction by a predetermined amount through the mixing chamber shell protrude into the interior of the mixing chamber. It is expedient if the supply pipes projecting into the mixing chamber are arranged offset in the longitudinal direction to the tools. This configuration allows the mixing or conveying tools to readily rotate at high speeds without colliding with the feed tubes, although the feed tubes may protrude into the area of the mixing or conveying tools.

Preferably, a plurality of parallel grooves extend axially on the circumference of the mixer shaft.

Thus, the mixing or conveying tools can be distributed as desired over the entire length of the mixer shaft. For example, depending on the fiber type and length, it is possible to use any number of conveying tools in the region of the loading or unloading opening. In the middle axial length range of the mixer shaft, the mixing tools, so for example spikes, can be accommodated in the required number. The distance between the tools is also adjustable.

Advantageously, the mixing or conveying tools with a threaded bolt at the end in a threaded bore of the sliding block can be screwed.

This attachment is easy to manufacture and the maintenance and replacement of tools is greatly simplified. In addition, a rotatable adjustment for the conveying tools is created.

• 1 eine Mischvorrichtung der Erfindung in geschlossenem Zustand in einer perspektivischen Darstellung,
• 2 eine Explosionszeichnung einer Mischvorrichtung der Erfindung in einer perspektivischen Darstellung,
• 3 einen Ausschnitt aus der Mischerwelle der Erfindung in einer perspektivischen Darstellung
• 4 eine Mischkammer der Erfindung in einer perspektivischen Darstellung und
• 5 eine Draufsicht auf ein Mischsystem im Rahmen der Erfindung.

In the following the invention will be explained in more detail with reference to exemplary embodiments illustrative drawings. Show it

• 1 a mixing device of the invention in the closed state in a perspective view,
• 2 an exploded view of a mixing device of the invention in a perspective view,
• 3 a section of the mixer shaft of the invention in a perspective view
• 4 a mixing chamber of the invention in a perspective view and
• 5 a plan view of a mixing system in the invention.

In the 1 and 2 is a mixing device 101 for continuous mixing of fibers with a binder for the production of fiberboard. The mixing device 101 has a substantially horizontally disposed, cylindrical mixing chamber 1 with a hollow cylindrical jacket 6 and at least one in the mixing chamber 1 rotating mixer shaft 2 on, on which several mixing tools 3 are attached. The mixing chamber 1 has a loading opening 4 on, which is formed in the embodiment as a loading funnel. About this loading funnel, the fibers from above into the interior of the mixing chamber 1 introduced. The fibers will pass over those on the rotating mixer shaft 2 attached mixer tools 3 mixed with a binder and at the same time conveyed in the conveying direction from front to back by the mixer. The binder is passed over several binder feed tubes 5 fed, which at the mixing chamber 1 are attached and through the mixing chamber jacket 6 through into the interior of the mixing chamber 1 protrude. The supply of the binder is carried out in the illustrated embodiment, therefore, not on the mixer shaft or on the mixing tools, but on the fixed to the mixing chamber 1 or the jacket 6 the mixing chamber 1 attached feed pipes 5 , which are designed as feed nozzles. Furthermore, the mixing device has a discharge opening 7 on, which is arranged in the conveying direction end. About this discharge 7 the mixture of fibers on the one hand and binders on the other hand is discharged or ejected. The discharge opening 7 is in the lower part of the mixing chamber 1 intended.

To the mixer shaft 2 is connected in a conventional manner an unillustrated drive. In the exemplary embodiment, the drive is arranged on the end or outlet side.

1 clarifies that to the mixer shaft 2 in a conventional manner a drive 34 connected. In the exemplary embodiment, the drive is arranged on the end or outlet side. This should be easily coupled, because it recognizes a means of transport below the mixing device 43 which is suitable for the entire mixing device 101 drive away. This will be closer to the description of the 5 explained.

During operation of the mixing device according to the invention, the fibers pass over the loading opening 4 into the mixing chamber 1 introduced and at the same time the binder, z. B. a glue such. As isocyanate, via the feed tubes 5 fed. The fibers are made by means of mixing tools 3 transported along the longitudinal direction and thereby brought via the centrifugal acceleration in the outer region and thus in the region of the mixer wall 6 accelerated. The rotational speed n of the mixer shaft and the diameter d of the mixing chamber are matched to one another such that the (nominal) centrifugal acceleration a of the fibers in the region of the mixer inner wall is 15,000 to 30,000 m / sec ² . In this case, the diameter d is preferably 300 mm to 1500 mm and the rotational speed n of the mixer shaft is preferably 2000 to 4000 U / min. It is therefore worked with relatively small diameters and high speeds, so that high centrifugal accelerations are achieved. This ensures that the fibers well on the jacket 6 and the inner wall of the mixer 1 pressed and compressed as it were. This leads to increased friction and thus to a better gluing behavior. It can also high throughputs of z. B. reach 5 t to 40 t per hour.

The representation in 2 shows in a special way the construction of the mixing device 101 , in the Essentially, it consists of a lower, usually on the foundation releasably secured lower frame part 17 and an upper frame part 16 , which here each have a cup-shaped sheet metal design with reinforcing bandages. The upper frame part 16 and the lower frame part 17 are about a joint 18 connected with each other. This joint 18 allows the bowl-shaped upper frame part 16 and the bowl-shaped lower frame part 17 to a tubular shell 6 can be folded, but also with the help of a drive with gearbox 19 can be opened by about 180 °.

This is also in an upper half shell 11 and a lower half shell 12 divided mixing chamber 1 into the shell-shaped framework parts 16 . 17 can be used, but also removable for quick maintenance. The half-shells 11 . 12 are preferably bent from a sheet and heat treated. Will the mixing chamber 1 when the pouring or Aufklappvorgang also shared with unfolded, is the mixer shaft 2 with their mixing tools 3 easy to maintain, easy to access. In addition, the upper half shell 11 or the lower half shell 12 taken from the mixing chamber of the respective frame half and completely replaced if too much wear.

As 2 are known as mixer tools 3 in the exemplary embodiment, several over the circumference of the mixer shaft 2 distributed mixing tools 3 each with a plurality of radially outwardly oriented spines 8th intended.

The mixing tools 3 extend along the longitudinal direction of the mixing chamber and thus parallel to the longitudinal axis of the mixer. In each case two adjacent mixing tools are preferred 3 are arranged offset in the axial direction or in the longitudinal direction by a predetermined amount to each other. This configuration causes the ends of the individual spines 8th are arranged helically in a plan view, as it were. This will ensure that over the spines 8th not only a perfect mixing of the fibers with the binder takes place, but that at the same time a perfect transport of the mixture is ensured with high throughput. In the embodiments, multiple feed tubes 5 arranged in a row along the longitudinal direction of the mixer.

The through the mixer wall 6 through into the mixing chamber protruding binder feed tubes 5 are offset longitudinally to the spines 8th of the mixing tools 3 arranged.

The 2 further shows that the loading opening 4 assigned area of the mixer shaft 2 formed spiked, wherein in this feed area conveying tools 9 at the mixer shaft 2 are attached. These conveying tools are paddle-shaped in the exemplary embodiment as start-up tools or starting paddles. They ensure that the over the loading opening 4 into the mixing chamber 1 entering fibers are accelerated quickly and promoted in the Beleimungsbereich.

It can also be seen that the discharge opening 7 assigned area of the mixer shaft 2 partially formed with spikes. In addition, ejection tools are in this discharge area 10 at the mixer shaft 2 attached. Also these ejection tools 10 are paddle-shaped formed as Auswurfpaddel. They ensure rapid removal of the mixture of fibers and binder and consequently the glued fibers via the discharge opening 7 ,

In an alternative embodiment, not shown, the invention also includes embodiments in which the binder on the mixer shaft and the mixing tools, for. B. the spines, is supplied. In such a mixer with "Innenbeleimung" the mixer shaft is formed as a hollow shaft and the spikes are also designed as a binder feed tubes, which are connected to the mixer shaft.

If working with glue supply tubes, which in a substantially radial direction through the mixer shell 6 into the mixing chamber 1 protrude, there is a possibility that these glue pipes are designed to be height adjustable. This means that the immersion depth of the glue pipes can be adjustable in the radial direction into the interior of the mixing chamber.

3 clearly shows how the mixing and conveying tools 3 . 8th . 9 . 10 Easy to maintain at the mixer shaft 2 are adjustably attached. The mixer shaft 2 has in this embodiment several longitudinally arranged T-slots, so grooves 20 that are partially covered. The shape of the groove 20 may vary within the scope of the invention and, for example, be dovetailed.

Inside the groove 20 are setting stones 21 slidably inserted, which are provided with a threaded bore. Every mixing and conveying tool 3 . 8th . 9 . 10 has a threaded bolt on a lower shaft 23 in the sliding stone 21 can be screwed. With the help of a locknut 24 becomes the mixing and conveying tool 3 . 8th . 9 . 10 fixed. This helps a thick washer 25 larger diameter than that of the lock nut 24 doing, the forces beyond the groove cover in the mixer shaft 2 to lead.

4 shows the cooling of the mixing chamber 1 in the context of this invention. The jacket of the mixer preferably water cooled. For this purpose, cooling channels made of semi-finished products are on the outer surface of the mixing chamber 26 with at least one coolant inlet 28 and a coolant outlet 29 appropriate. The individual channel sections 27.1 . 27.2 run in this embodiment, parallel in the axial direction and are over deflections 31 connected meandering.

Preferably, the semifinished products are pipes, pipe sections or beveled metal sheets which are located on the outer circumference of the mixing chamber 1 glued on, welded or screwed using interposed seals. Then there is the possibility, a part of the channel wall 30 through the outer surface 14 the mixing chamber 2 to form oneself. Thus, the heat transfer is significantly improved. An exemplary screw connection 35 of bent sheets 26 with the mixing chamber 1 that work together with part of the surface 30 the mixing chamber a cooling channel 26 form is in 4a shown. When the cooling channel 26 detachable on the mixing chamber 1 attached, it can easily be maintained separately.

Just as the spikes or pins are designed as wear-resistant spikes or pins, so can the inner walls of the mixing chamber 1 wear-resistant, z. B armored with abrasion resistant coatings, be formed. By way of example, an overlay weld is used here 33 with a surface hardness> 600 HV or silicon carbide tiles 32 in question.

5 finally shows a whole mixing system 100 , exemplary of a large rice straw plant. In such a plant, the mixing devices are particularly at risk because the fibers to be mixed with binders are still very abrasive. To meet the maintenance requirements, are for the mixing devices 101 working positions 41.1 . 41.2 . 41.3 . 41.4 provided as well as two maintenance positions 42.1 . 42.2 , in a separate maintenance room. In both positions are the upper frame part 16 and the upper half shell 11 Drawn opened by 180 °.

Between the individual working and maintenance positions transport means that are able to move a mixing device 101 to transport. A straight to be transported mixing device 101 is shown in closed condition.

The solution shown and preferred in the embodiment comprises transport trolleys mounted on rails 44 are movable. It is envisaged that a lifting device 45 is present (recognizable in 1 ), the mixing device detached from the foundation 101 can lift so that a trolley can drive underneath. The mixing device is then in its entirety on the means of transport 43 discontinued and, for example, from a working position 41.1 . 41.2 . 41.3 . 41.4 to a maintenance position 42.1 . 42.2 method. The means of transport can be moved longitudinally and transversely, as offered for example by the company Strothmann Machines and Handling Systems GmbH with its round rail system.

In the maintenance position, the mixing device can then be conveniently opened and cleaned without interrupting the production process. If the mixing device to a drive 34 the mixer shaft can be connected 2 be rebalanced.

LIST OF REFERENCE NUMBERS

1

mixing chamber

2

mixer shaft

3

mixing tool

4

loading opening

5

Binder supply pipes

6

coat

7

unloading

8th

spur

9

conveying tool

10

ejection tool

11

Upper half shell

12

Lower half shell

13

Inner peripheral surface of the mixing chamber

14

Outer peripheral surface of the mixing chamber

15

framework

16

Upper frame part

17

Lower frame part

18

joint

19

Drive with gearbox

20

groove

21

sliding block

22

Threaded hole of the sliding block

23

threaded bolt

24

locknut

25

washer

26

Cooling channel of semi-finished products

27.1, 27.2

channel section

28

Coolant inlet

29

coolant outlet

30

Part of the cooling channel

31

redirection

32

tiling

33

welding layer

34

Drive the mixer shaft

35

screw connection

36

Bent sheet metal

41.1, 41.2

working position

42

maintenance position

43

Mode of Transport

44

rail

45

Lifting or lowering device

100

mixing system

101

mixing device

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 2438818 [0006]
• DE 102009057916 B4 [0008, 0009]

Claims (12)

Mixing device for the continuous mixing of fibers or shavings with a binder for the production of fiber or chipboard, wherein the mixing device comprises at least one mixing chamber (1) supported by a framework (15, 16, 17) and several therein a rotatable mixing shaft (2) fixed mixing or conveying tools (3, 8, 9, 10), characterized in that on the outer surface of the mixing chamber (1) cooling channels (26) made of semi-finished products with at least one coolant inlet (28) and a coolant outlet (29) are mounted , Mixing device according to Claim 1 , characterized in that the mixing chamber (1) comprises two sheet metal bent and connectable half-shells (11, 12). Mixing device according to Claim 1 or 2 , characterized in that the half shells (11, 12) in an upper frame part (16) and a lower frame part (17) are supported. Mixing device according to Claim 3 , characterized in that the upper frame part (16) and the lower frame part (17) via a joint (18) are interconnected. Mixing device according to one of Claims 2 to 4 , characterized in that the respective associated half shell (11, 12) in the upper frame part (16) and / or the lower frame part (17) is releasably secured and removable. Mixing device according to one of Claims 1 to 5 , characterized in that the cooling channels (26) are arranged meander-shaped on the outer peripheral surface of the mixing chamber (1). Mixing device according to one of Claims 1 to 6 Characterized in that a cooling channel (26) of at least one leading the coolant first channel section (27.1), a deflection (31) and at least one of the first channel section immediately adjacent returning second channel section (27.2) is formed. Mixing device according to Claim 7 , characterized in that the first channel section (27.1) and the second channel section (27.2) are arranged in the axial direction of the mixing chamber (1). Mixing device according to one of Claims 1 to 8th , characterized in that a part of a cooling channel (26) is formed by the outer peripheral surface of the mixing chamber (1). Mixing device according to one of Claims 1 to 9 , characterized in that a cooling channel (26) on the outer peripheral surface of the mixing chamber (1) is releasably attached. Mixing device according to one of Claims 1 to 10 , characterized in that the mixer shaft (2) partially covered grooves (20), in which movable sliding blocks (21) are arranged, which are connectable to a mixing or conveying tool (3, 8, 9, 10). Mixing device according to Claim 11 , characterized in that the mixing or conveying tools (3, 8, 9, 10) with a threaded bolt (23) at its end in a threaded bore (22) of the sliding block (21) are screwed.

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