DE102008049265A1 - Mixer has mixing container and agitator arranged in mixing container, which is rotated by drive around agitator axis supported on mixing container or on cover - Google Patents

Abstract

The mixer has a mixing container (1) and an agitator (3) arranged in the mixing container, which is rotated by a drive around the agitator axis (4) supported on the mixing container or on a cover (2). Other agitators (7a,7b) are arranged in the mixing container, which is rotated by the drives (9,9a,9b) around the agitator axes (8a,8b) supported on the mixing container or on a cover, different from the former agitator. An independent claim is included for a method for mixing or homogenization of solid, liquid or pasty products.

Description

The The invention relates to a mixer with a mixing container and with a first arranged in the mixing container Agitator, which by means of a drive to a on the Mixing container or on a lid of the same stored first agitator axis is rotatable, wherein the first agitator arranged on its Rührwerksachse and from this to having externally projecting first mixing means. The The invention further relates to a method for mixing and / or homogenizing solid, liquid and / or pasty products by means of of such a mixer directed by the products the mixing container such a mixer with at least one arranged in the mixing container Agitator abandoned, the at least one agitator rotated by a drive and then the mixture is removed from the mixing container.

To the Mixing and / or homogenizing of solid, liquid and / or more or less viscous or pasty products various mixers known. On the one hand come external homogenizers used, through which the mix by forced circulation is conveyed from a container in the circulation. The disadvantage here is in addition to the apparatus technology relatively high expenditure on the one hand, on the one hand a constantly existing product loss due to the external recirculation line. On the other hand requires the forced circulation a container with a conical Soil with relatively steep cone angle, which in turn, in many cases a use of the container as a mixing container may be unfavorable for the preparation of premixes.

To the others exist a variety of generic Mixers, their mixing vessels with a rotatable agitator equipped, the mixing process being exclusive in the mixing container vonstatten goes. The technical apparatus and the cleaning effort is lower in such mixers. However, the mixing performance is limited in many cases and Often there is no absolute certainty that the entire mix actually uniform has been homogenized, because depending on the geometry and arrangement the agitators in a horizontal and / or vertical direction can set asymmetric flow profile, which In some areas, only an insufficient mixture / homogenization of the Mixing material causes. This can also be an insufficient Venting of the mix and - in the case of Heating or cooling of the mix - local overheating or Subcooling results, which in particular in the case of sensitive mix, such as pharmaceutical or cosmetic products can be problematic.

In order to ensure the most homogeneous and time-efficient mixing, it is in generic mixers z. B. known to hen the mixing container with flow breakers to verses, which are rigid and optionally adjustable and are used as baffles for mixed by means of agitator mixing material ( DE 41 17 773 A1 ). If the mixing process is to be accompanied by comminution of any particles or particle aggregations of the mixed material, it is also possible to provide so-called "choppers", which are usually formed by a reciprocable or rotationally displaceable knife arrangement ( EP 1 123 731 B1 ). However, the effect of such passive or static flow breakers is limited and, in the case of relatively viscous mixtures in particular, there is even the danger of adhesion or accumulation of mix at the flow breakers.

In contrast, a more effective mixing effect possess so-called planetary ( DE 2 129 549 A ) and in particular coaxial agitators ( DE 101 10 910 C1 ). In the former case, a rotatable shaft with mixing devices is mounted eccentrically on a central main shaft of the agitator inside the mixing container. In addition, a scraper for stripping mixed material from the inner wall of the mixing container may also be eccentrically fixed to the main shaft. In the case of Koaxialrührwerks the central shaft is on the one hand in turn provided with mixing means, on the other hand it serves to support a second shaft coaxial therewith, which is also equipped with mixing devices and relative to the main shaft, for example, in opposite directions, rotatable. In both cases, although an effective and time-effective homogenization of the mix is achieved, but the design effort is complicated and expensive, in particular with regard to the bearing of the shaft and it is also practically impossible, the storage of the second - with respect to the main shaft eccentrically or coaxially arranged - Shaft on the main shaft form sterile, so that the use of such a stirrer for sterile mix, such as in the food or pharmaceutical industry, limits are set.

The DE 102 02 084 A1 Finally, describes a generic mixer with an agitator, which has fixed to a central agitator shaft or shaft mixing devices, wherein the central agitator is associated with a crusher, which comprises a rotating cutting tool. In addition, a flow breaker can be provided laterally of the central agitator axis on a shaft parallel thereto, which can be aligned by rotation about this axis with respect to the mixing container in order to disturb the rotational movement of the mixed material. down visually the disadvantages essentially the same applies to the above to the adjustable flow breakers.

Of the Invention is therefore based on the object, a mixer of the above in a simple and cost-effective way, that at least as far as possible avoiding the aforementioned Disadvantages ensured an improved mixing or homogenizing effect is.

According to the invention solved this problem in a mixer of the type mentioned, that in the mixing container at least a second Agitator is arranged, which by means of a drive one at the mixing container or at a lid thereof stored, different from the first agitator axis second Agitator axis is rotatable, wherein the second agitator at its Rührwerksachse to orderly and from this to having externally projecting second mixing means, wherein at least some of the first and second mixing devices into each other intervention.

By the inventive design of the mixer with at least two stirrers, which are independent from each other - be it in the same direction as different ones Speeds or be it z. B. in opposite directions with the same or different Speeds - are rotatable and their mixing devices Intervene is one of the highest possible Degree of mixing or homogenization of the mix in a simple and in particular easily sterile sterile trainee seal the separately mounted axes of the agitators ensures which is a virtually any setting desired flow profiles of the mixed material in Inside the mixing container allows, which also adapted to variously configured mixing devices can be. This is ensured by the intervention of the mixing devices the at least two stirrers for extraordinary high mixing performances as well as shearing of fluid mixtures, as they are practical according to the prior art only possible with coaxial agitators are, however, associated with the disadvantages mentioned above. Any heating and / or cooling times of the mixed material inside The mixing container can therefore be kept to a minimum limit without the risk of local overheating or subcooling exists. Likewise can be due the turbulence generated by the agitators cleaning times shorten.

With "in one another Intervening mixing devices "is in this context Otherwise, it is meant that at least some of the mixing devices of the first and second agitator such a radial extent from their respective agitator axis, that the Mixing devices of adjacent agitator axes during rotation at least partially overlap. This can be done by corresponding arrangement of the mixing devices at the respective Agitator axis - z. B. such, the mixing devices each at different height levels on the agitator axes are set to collisions during operation too avoid - and / or through a suitable synchronization the drives of the agitator axes happen - z. B. such that at the same height levels to the Agitator axes arranged mixing devices according to Art of gears "comb" with each other. The first design, however, is due to lower complexity as well individual drive option of the agitator axes independent of each other in most cases To give preference.

In advantageous embodiment can be provided that the first agitator axis of the first agitator substantially coincides with an axis of symmetry of the mixing container, so that the first agitator axis therefore central and preferably vertically to the mixing vessel or at a lid thereof is stored. In this case, it offers itself on, that the first agitator rotatably with strippers for stripping the first agitator axis of mixed material from the inner wall of the mixing container, as he as such in generic agitators is known to possibly otherwise occurring Adhesions of mix on the inner wall of the mixing container reliable to avoid.

Of the Scraper whose outer contour is appropriate complementary to the inner contour of the mixing vessel wall is formed, may preferably in turn with from this above Be equipped mixing devices, which in particular substantially in the direction of the first agitator axis, ie inside of the mixing container, protrude. A particularly advantageous Design can in this case for the reasons mentioned above Provide that the mixing means of the scraper and at least some of the second mixing means of the at least a second agitator also interlock.

According to one preferred embodiment of the invention Mixer can be provided that at least two second Stirrers are provided, which by means of a drive one at the mixing container or at a lid of the same stored, different from the first agitator axis second Agitator axes are rotatable, the second agitators arranged on their Rührwerksachsen and by these after have externally projecting second mixing devices, wherein at least some of the first and second mixing devices Both second agitators intermesh.

Around for virtually any airfoil inside of the mixing tank, it has been shown that it this is sufficient if, in addition to the first, in particular central agitator exactly two second agitators are provided. The agitator axes of these second agitators may preferably be at an angle between about 90 ° and about 180 ° with respect to the first agitator axis be arranged, d. H. imaginary connecting lines of the Agitator axes form either a line (in the case of diametrically opposed arrangement of the second agitators with respect to the first agitator, d. H. in the case of an angle from 180 °) or a preferably equilateral triangle (in the case of an angle of less than 180 °), the distance the second agitators of the first agitator Preferably, it is the same, whereby the same side as the imaginary equilateral triangle are formed. Basically it in the event that the first (central) agitator axis extending in two directions from this outwards Scraper has, expedient if the second Agitator axes at a different angle with respect to arranged the agitator axis of the first agitator are as the two arms of the scraper, to prevent the not both arms of the scraper during operation pass the two second agitators simultaneously, otherwise what with increasing speed of the agitator axes with the intermeshing mixing devices to considerable pressure surges could lead. So can the on the first agitator axis fixed scrapers, for example, two with respect to the first agitator axis have diametrically opposite arms, so that the first Agitator is constructed axisymmetric, while the two second agitator axes under a different from 180 ° Angle arranged with respect to the first agitator axis are, preferably at an angle of about 120 ° to about 160 °. However, of course also be provided three or more second agitators, which approximately equidistant from each other around the first agitator around (eg three stirrers at an angle of 120 °, d. H. distributed symmetrically around the first agitator axis) or - depending on the design of a possibly provided scraper - off the reasons mentioned above also under different circumferential angles can be arranged to each other.

While it, as already indicated, of course, also possible is to synchronize the different agitator axes with each other, which For example, by means of suitable transmission, preferably with adjustable translation, can take place, each agitator axis preferably one have separate drive in order to both in a constructive as well as in terms of technical terms very simple design for the highest possible individual Adjustability of the flow profile in the mixing container to care.

About that In addition, it can be provided that the agitator axes the first and / or the second agitator / agitators are arranged substantially parallel to one another, or the second agitator axis (s) is / are oblique with respect to the first agitator axis arranged. In particular, the latter embodiment has with regard to to a highly effective flow for mixing or homogenization of the mixed material in the interior of the mixing container proved to be particularly advantageous because in particular the vertical Flow component of the mix favored becomes. In addition, by such an oblique Arrangement of the second agitator / agitators for such turbulence of the mix in the mixing vessel be ensured that from above dosed Mischgutkomponenten also not on vertically arranged surfaces of the mixing devices stick to it.

In such cases of obliquely arranged second Agitator axes it may be appropriate when the free ends of the first agitator axis and the second agitator axis (s) approach each other, wherein the second (s) Rührwerksachsen preferably on the first agitator axis to be able to go the agitator axes thus z. B. in a point along an imaginary extension over the free end of the first agitator axis can cut out. Thus, the first agitator has a central first agitator axis on, the second agitator axis (s) is / are here in Direction of the center of the mixing container inclined. The second (n) Agitator axis (s) may / may be appropriate at an angle between about 5 ° and about 30 °, in particular between about 10 ° and about 25 °, preferably between about 15 ° and about 20 °, in relation to the first agitator axis to be inclined. runs The latter perpendicular, so correspond to the mentioned inclination angle hence a tilt in relation to the vertical.

Either in the case of such inclined inclined agitator axes as well as in the case of parallel agitator axes of the first and second agitators may be advantageous if the intermeshing first and second mixers of all Agitators arranged substantially parallel to each other are so that as uniform as possible and homogeneous mixing of the mix is achieved. The same especially applies to the mixing devices of the scraper, which also preferably substantially parallel to the mixing devices the first and second agitators can be arranged.

Even in the case of one or more inclined second Rührwerksachsen for such a substantially parallel arrangement of Mischeinrich tions of all agitators can be provided in an advantageous embodiment that the mixing means of the / - inclined - second agitator axis (s) of the second agitator / agitators substantially vertically outwardly projecting (ie at an angle of about 90 ° relative to the respective axis), while the mixing means of the first agitator and - if a scraper is provided - those of the scraper at an angle of inclination of the second agitator axis (s) approximately corresponding inclination angle on the first agitator axis and optionally on the scraper are arranged.

moreover can the intermeshing mixing devices the agitators and - if provided - the of the scraper substantially equidistant from each other be arranged to be as uniform as possible and homogeneous mixing of the mixed material in the mixing container to care.

As already indicated, the invention offers in particular the simple and cost-effective possibility of a sterile Requirements corresponding mixer, which is why an advantageous Embodiment can provide that each agitator axis by means of a sterile seal, in particular in the form of a double-acting Mechanical seal, against the mixing container or a lid the same is sealed.

According to one Further development of the invention may further be provided that the arranged on the agitator axes mixing devices with respect to the horizontal inclined at the respective agitator axis, z. B. obliquely from the respective agitator axis extending outwards and downwards, are arranged. To this Way are horizontally arranged surfaces of the agitators including their mixing devices avoided, so that on These are no significant product residues of the Mixing remains and also a simpler and faster cleaning of the mixer is possible.

The For example, mixing devices may be substantially the shape of, optionally perforated, stirring blades or also -stäben etc., with such stirring blades vertical with the narrow side up and down or even inclined, like in the manner of a slanted blade stirrer can. Likewise, the mixing devices of course, depending on the requirements of the mix have any other known configurations, for. B. in shape optionally provided with a circumferential toothing Discs (so-called "dissolver" stirrers, z. For non-Newtonian media) for high shear input, in the form of propellers with two, three or more propeller blades (eg for low viscosity media), etc.

Of course it is also possible that the mixing container a tempering device, such as a heating and / or cooling device, has for the mix, which is due to the inventive Design of the agitators possible heating and / or cooling times reduce.

The Finally, the invention also relates to a method for mixing and / or homogenizing solid, liquid and / or pasty products by adding the products to the mixing container a mixer with at least one arranged in the mixing container Agitator abandoned, the at least one agitator rotated by a drive and then the mixture is removed from the mixing container, wherein the inventive Process characterized in that a mixer of the aforementioned Type is used.

Further Advantages and features of the invention will become apparent from the following Description of an embodiment with reference on the drawings. Showing:

1 a schematic side view of an agitator assembly of the mixing container of an embodiment of a mixer according to the invention;

2 a schematic plan view of the lid of the mixer according to 1 to illustrate the arrangement of the agitators relative to each other; and

3 a schematic longitudinal section through the sterile trained shaft seal one of the agitator axes of the mixer according to 1 and 2 ,

In 1 is schematically shown an embodiment of a mixer according to the invention, of whose mixing container, only the inner wall by means of the dashed line 1 is indicated. The mixing container 1 has in the present case a substantially circular cylindrical upper portion and a subsequent thereto down, tapering substantially in the manner of a cone lower portion, the geometry of the mixing container can of course be designed differently and of course especially the ground, for example, about a spherical segment or in Form of a dished bottom can be formed. The mixing container 1 can by means of an attachable lid 2 opened and closed, with the lid 2 in the closed state z. B. in a conventional manner against the mixing container 1 may be sealed to the container interior by means of the mixing container 1 and / or on the cover of which subsequent pump bleen (not shown) to evacuate or put under pressure. In addition, the mixing container 1 in also known as such with a tempering (also not shown) to be able to heat or cool it.

In the mixing container 1 is a first agitator 3 arranged, whose first agitator axis or shaft 4 z. B. in the below with reference to 3 explained in more detail way against the lid 2 is sealed and which with the central axis of symmetry of the mixing vessel 1 coincides. The first agitator axis 4 is by means of a particular controllable both in direction of rotation and speed drive 9 in rotation displaceable, the drive 9 convenient with the in 1 upper, free end of the first agitator axis 4 can be coupled. At the first agitator axis or shaft 4 are a plurality of outwardly projecting mixing devices 5 fastened rotationally fixed, which in the present embodiment have substantially the shape of the narrow side up and down pointing stirrer blades and may optionally be interspersed with holes (not shown) to cause additional turbulence. The mixing devices 5 In addition, in the illustrated embodiment, they are inclined downwardly with respect to the horizontal at the first agitator axis 4 set by moving from this agitator axis 4 z. B. at an angle of about 18 ° obliquely outwards and downwards. They extend in this case in pairs in at least two diametrically opposite directions of the agitator axis 4 Of course, with additional, in other directions of the agitator axis 4 projecting (eg perpendicular to the plane of the drawing and / or obliquely thereto) mixing devices 5 may be provided (not shown), z. B. three reasons of rotational symmetry, in particular at an angle of 120 °, four in particular at an angle of 90 °, etc. arranged mixing devices.

The central agitator axis 4 of the first agitator 3 also has a likewise rotatably connected to this scraper 6 on which z. B. from an approximately anchor-shaped rod or - according to the mixing devices - square flat profile may be formed and parallel to the inner wall of the mixing container 1 extends to abrade thereon optionally adhering mix. The two - in 1 right and left - arms of the scraper 6 Also rotationally symmetric reasons extend in at least two diametrically opposite directions of the first agitator axis 4 continued. The scraper 6 is for example at the in 1 lower end of the first agitator axis 4 determined, z. B. welded thereto. One parallel to the other mixing devices 5 arranged lower mixing device 5a can be the two arms of the scraper 6 for stabilization purposes in addition to the first agitator axis 4 connect; In the present exemplary embodiment, they are arranged at the same angle outwards and downwards as the first mixing devices 5 , The scraper 6 is in turn with mixing facilities 5b provided, which towards the interior of the mixing vessel 1 , as in the direction of the central first agitator axis 4 , project and according to the mixing devices 5 the first agitator axis 3 can be configured. The mixing devices 5b of the scraper 6 extend in the present case also below the angle of inclination of the mixing devices 5 . 5a corresponding angle of z. B. about 18 ° obliquely upwards and inwards, in particular with the mixing devices 5 the first agitator axis 4 aligned.

In addition to the first agitator 3 are in the mixing tank two second agitators 7a . 7b arranged, whose respective second Rührwerksachsen or -wellen 8a . 8b also in the below with reference to 3 explained in more detail way against the lid 2 can be sealed. Both second agitator axes 8a . 8b are laterally of the first central agitator axis 4 arranged, such. B. at two approximately this opposite sides, as described below with reference to 2 is described in more detail. The second agitator axes 8a . 8b the second agitators 7a . 7b thus each extend between the central first agitator axis 4 and the attached thereto arms of the scraper 6 , The second agitator axes 8a . 8b are also with this - perpendicular in the present case - outwardly projecting second mixing devices 5c equipped, whose geometry is largely the mixing equipment 5 the first agitator axis 4 may be the same or different. The length of the first 5 and second mixing devices 5c as well as the mixing facilities 5b of the scraper 6 is dimensioned such that both the first 5 and second mixing devices 5c as well as the latter and the mixing devices 5b of the scraper 6 interlock. The second mixing devices 5c the second agitator axes 8a . 8b are therefore in the present embodiment at different height levels compared to the first mixing devices 5 the central first agitator axis 4 as well as towards the mixing devices 5b of the scraper 6 on the respective axis 4 . 8a . 8b set - ie the second mixing devices 5b extend into the spaces between the first mixing devices 5 and those 5b of the scraper 6 in and vice versa, so that collisions due to the height offset of the mixing devices 5 . 5b . 5c and also 5a be avoided during operation. All mixing equipment 5 . 5a . 5b . 5c are here arranged approximately equidistant (viewed in the vertical direction), wherein the mixing devices 5 of the first agitator 3 with whom 5c the second agitators 7a . 7b are arranged alternately.

The second agitator shafts or axles 8a . 8b are otherwise by means of a further, in particular also both in terms of direction of rotation and speed controllable drive 9a . 9b in rotation displaceable, the drives 9a . 9b turn appropriate with the in 1 upper, free end of the respective second agitator axis 8a . 8b can be coupled. All drives 9 . 9a . 9b In this case, they can be controlled separately, in particular, by setting the speed and / or direction of rotation of each drive accordingly 9 . 9a . 9b independently any desired flow profiles in the mixing container 1 to be able to adjust individually according to the requirements of the mixed material.

Like the other one 1 it can be seen, are the two second agitator axes 8a . 8b in the embodiment shown with respect to the first - vertical - agitator axis 4 arranged obliquely, for example, they are inclined at an angle of inclination of about 18 ° with respect to the vertical, for example, that the free (in 1 lower) ends of the first 4 and second agitator axes 8a . 8b to run towards each other. It may be useful if the mixing devices 5 . 5a . 5b the central first agitator axis 4 and the scraper 6 as already mentioned, extend obliquely downward at a corresponding angle of inclination, while those at the oblique second agitator axes 8a . 8b specified and intervening mixing devices 5c approximately perpendicular to the oblique second agitator axes 8a . 8b are fixed to induce during operation a vertical flow direction component in the mixing vessel. This can be an approximately parallel orientation of intermeshing mixing devices 5 . 5a . 5b . 5c which is an arrangement of the intermeshing mixing devices 5 . 5a . 5b . 5c relatively close to possible.

In 2 is a top view of the lid 2 according to the mixer 1 shown, it can be seen that the second agitator axes 8a . 8b the second agitators 7a . 7b in relation to the first agitator axis 4 at a circumferential angle α of z. B. are arranged about 150 ° to avoid pressure surges, as they might otherwise occur during operation, when the two are from the first agitator axis 4 in diametrically opposite directions extending arms of the scraper 6 (see. 1 ) at the same time also on diametrically opposite sides of the first agitator axis 4 arranged second agitator axes (ie in the case of an angle α of 180 °, not shown) would pass. The distance between every second agitator axis 7a . 7b and the first agitator axis 4 may, however, be the same (cf. 2 ). Of course, the second agitator axes 8a . 8b alternatively also on diametrically opposite sides of the first agitator axis 4 be arranged (α = 180 °), if z. B. no scraper is provided, it has only one or two non-rotationally symmetrically arranged or three rotationally symmetrically arranged Abstreiferarme or such pressure surges accepted or even desired.

Of the 2 Finally, it can be seen further that the lid 2 a plurality of fastening flanges provided with openings S1-S12, wherein the openings S1, S3, S4 for receiving the agitator shafts 4 . 7a . 7b serve, while the remaining openings S2, S5-S12 for receiving other facilities, such as measuring devices (temperature, pressure measuring devices, etc.), sight glasses, pump connections, material feeding devices and the like may be provided.

How out 3 can be seen, the sealing of the first 4 and the second agitator axes or shafts 8a . 8b against the lid 2 be formed sterile in a simple manner to open up the mixer according to the invention also a use for hygienically highly sensitive mix. 3 shows an example of a possibility of shaft seal the agitator axis or shaft 4 . 8a or 8b by means of a sterile seal in the form of a double-acting mechanical seal, which the respective shaft 4 . 8a . 8b against the lid 2 sterile seals.

On the respective wave 4 . 8a . 8b Here is on the one hand a shaft sleeve 10 rotatably disposed, on the other hand, at both ends of the shaft sleeve 10 one holding part each 11 . 12 also rotatably on the shaft 4 . 8a . 8b (in 3 below) or on the sleeve 10 (in 3 above) arranged and optionally sealed mittele conventional ring seals D1, D2. One at a radial distance from the shaft sleeve 10 arranged, stationary housing part 13 extends between the two with the shaft 4 8a . 8b co-rotating holding parts 11 . 12 , Latter 11 . 12 as well as the housing part 13 have in the axial direction facing each other receptacles for receiving a respective mechanical seal D3, D4, which in each case one in the respective receptacle of the housing part 13 arranged static or stationary sealing part (the two in 3 inner sealing rings of the mechanical seals D3, D4) and a in the respective receptacle of the holding part 11 . 12 arranged, with the shaft 4 . 8a . 8b with rotating sealing part (the two in 3 outer sealing rings of the mechanical seals D3, D4) include. The housing part 13 has a substantially central, with respect to the shaft 4 8a . 8b in the radial direction bore 13a on which with a hole 14a one on the outside of the housing part 13 fixed and also sealed by means of a conventional sealing ring D5 contrast flange 14 flees. The holes 13a . 14a serve for introducing a barrier liquid in the one hand of the housing part 13 and the sleeve 10 on the other hand by the two mechanical seals D3, D4 limited space to ensure the sterile function of the seal assembly. The barrier liquid, which may serve as the cooling medium at the same time, may, for. B. by means of the holes 13a . 14a corresponding, further holes (not shown) of the sleeve 13 or one in 3 not shown further flange (eg., On the in 3 right side of the shaft 4 . 8a . 8b , opposite to the holes 13a . 14a ) are discharged again from the intermediate space, so that the latter is continuously penetrated by the blocking / cooling liquid.

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - DE 4117773 A1 [0004]
• - EP 1123731 B1 [0004]
• - DE 2129549 A [0005]
• - DE 10110910 C1 [0005]
• - DE 10202084 A1 [0006]

Claims (23)

Mixer with a mixing container ( 1 ) and one in the mixing container ( 1 ) arranged first agitator ( 3 ), which by means of a drive to one of the mixing container ( 1 ) or on a lid ( 2 ) of the same bearing first agitator axis ( 4 ) is rotatable, wherein the first agitator ( 3 ) on its agitator axis ( 4 ) and projecting outwardly therefrom first mixing devices ( 5 ), characterized in that in the mixing container ( 1 ) at least one second agitator ( 7a . 7b ) is arranged, which by means of a drive ( 9 . 9a . 9b ) to one at the mixing container ( 1 ) or on a lid ( 2 ) of the same stored, from the first agitator axis ( 4 ) different second agitator axis ( 8a . 8b ) is rotatable, wherein the second agitator ( 7a . 7b ) on its agitator axis ( 8a . 8b ) and projecting outwardly therefrom second mixing devices ( 5c ), wherein at least some of the first ( 5 ) and second mixing devices ( 5c ) interlock. Mixer according to claim 1, characterized in that the first agitator axis ( 4 ) of the first agitator ( 3 ) substantially with an axis of symmetry of the mixing container ( 1 ) coincides. Mixer according to claim 1 or 2, characterized in that the first agitator ( 3 ) rotatably with the first agitator axis ( 4 ) connected scrapers ( 6 ) for stripping mixed material from the inner wall of the mixing container ( 1 ) having. Mixer according to claim 3, characterized in that the scraper ( 6 ) in turn with mixing devices ( 5b ) Is provided. Mixer according to claim 4, characterized in that the mixing devices ( 5b ) of the scraper ( 6 ) and at least some of the second mixing devices ( 5c ) of the at least one second agitator ( 7a . 7b ) also interlock. Mixer according to one of claims 1 to 5, characterized in that at least two second agitators ( 7a . 7b ) are provided, which by means of a drive ( 9 . 9a . 9b ) to one at the mixing container ( 1 ) or on a lid ( 2 ) of the same stored, from the first agitator axis ( 4 ) different second agitator axes ( 8a . 8b ) are rotatable, the second agitators ( 7a . 7b ) on their agitator axes ( 8a . 8b ) and projecting outwardly therefrom second mixing devices ( 5c ), wherein at least some of the first ( 5 ) and second mixing devices ( 5c ) of both second stirrers ( 7a . 7b ) interlock. Mixer according to claim 6, characterized in that exactly two second agitators ( 7a . 7b ) are provided. Mixer according to claim 7, characterized in that the agitator axes ( 8a . 8b ) of the second agitators ( 7a . 7b ) with respect to the first agitator axis ( 4 ) are arranged at an angle (α) between 90 ° and 180 °. Mixer according to one of claims 1 to 8, characterized in that each agitator axis ( 4 . 8a . 8b ) a separate drive ( 9 . 9a . 9b ) having. Mixer according to one of claims 1 to 9, characterized in that the agitator axes ( 4 . 8a . 8b ) of the first ( 3 ) and of the second agitator (s) ( 7a . 7b ) are arranged substantially parallel to each other. Mixer according to one of claims 1 to 9, characterized in that the second (s) agitator axis (s) ( 8a . 8b ) with respect to the first agitator axis ( 4 ) is arranged obliquely / are. Mixer according to claim 11, characterized in that the free ends of the first agitator axis ( 4 ) and the second agitator axis (s) ( 8a . 8b ) approach each other. Mixer according to claim 11 or 12, characterized in that the second agitator axis (s) (s) ( 8a . 8b ) on the first agitator axis ( 4 ) to run. Mixer according to one of claims 11 to 13, characterized in that the second agitator axis (s) (s) ( 8a . 8b ) at an angle between 5 ° and 30 °, in particular between 10 ° and 25 °, preferably between 15 ° and 20 °, with respect to the first agitator axis ( 4 ) is / are arranged. Mixer according to one of Claims 1 to 13, characterized in that the intermeshing first and second mixing devices ( 5 . 5c ) of all agitators ( 3 . 7a . 7b ) are arranged substantially parallel to each other. Mixer according to one of Claims 3 to 15, characterized in that the mixing devices ( 5b ) of the scraper ( 6 ) substantially parallel to the mixing devices ( 5 . 5c ) of the first and second agitators ( 3 . 7a . 7b ) are arranged. Mixer according to one of Claims 11 to 16, characterized in that the mixing devices ( 5c ) from the second agitator axis (s) ( 8a . 8b ) of the second agitator (s) ( 7a . 7b ) protrude substantially perpendicular to the outside, while the mixing devices ( 5 ) of the first Agitator ( 3 ) and, where appropriate, the ( 5b ) of the scraper ( 6 ) under a tilt angle of the second agitator axis (s) ( 8a . 8b ) about corresponding inclination angle at the first agitator axis ( 4 ) and optionally on the scraper ( 6 ) are arranged. Mixer according to one of claims 1 to 17, characterized in that the intermeshing mixing devices ( 5 . 5a . 5b . 5c ) of the agitators ( 3 . 7a . 7b ) and optionally the scraper ( 6 ) are arranged substantially equidistant from each other. Mixer according to one of claims 1 to 18, characterized in that each agitator axis ( 4 . 8a . 8b ) by means of a sterile seal, in particular in the form of a double-acting mechanical seal (D3, D4), against the mixing container ( 1 ) or a lid ( 2 ) of the same is sealed. Mixer according to one of claims 1 to 19, characterized in that the on the agitator axes ( 4 . 8a . 8b ) and optionally on the scraper ( 6 ) mixing devices ( 5 . 5a . 5b . 5c ) with respect to the horizontal inclined to the respective agitator axis ( 4 . 8a . 8b ) are arranged. Mixer according to one of claims 1 to 20, characterized in that the mixing devices ( 5 . 5a . 5b . 5c ) have substantially the form of, optionally perforated, stirring blades. Mixer according to one of claims 1 to 21, characterized in that the mixing container ( 1 ) has a tempering device, such as a heating and / or cooling device for the mix. Process for mixing and / or homogenizing solid, liquid and / or pasty products by mixing the products with the mixing container ( 1 ) of a mixer with at least one in the mixing container ( 1 ) arranged agitator ( 3 . 7a . 7b ), the at least one agitator ( 3 . 7a . 7b ) by means of a drive ( 9 . 9a . 9b ) and the mixture then the mixing container ( 1 ), characterized in that a mixer according to any one of claims 1 to 22 is used.