EP0237042B1 - Apparatus and tool for mixing and use thereof - Google Patents

Apparatus and tool for mixing and use thereof Download PDF

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Publication number
EP0237042B1
EP0237042B1 EP87103482A EP87103482A EP0237042B1 EP 0237042 B1 EP0237042 B1 EP 0237042B1 EP 87103482 A EP87103482 A EP 87103482A EP 87103482 A EP87103482 A EP 87103482A EP 0237042 B1 EP0237042 B1 EP 0237042B1
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EP
European Patent Office
Prior art keywords
mixing
tool
mixing tool
shaft
mixing device
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP87103482A
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German (de)
French (fr)
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EP0237042A1 (en
Inventor
Klaus Burk
Ulrich Burk
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Individual
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Individual
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Filing date
Publication date
Priority claimed from DE3608038A external-priority patent/DE3608038C1/en
Application filed by Individual filed Critical Individual
Priority to AT87103482T priority Critical patent/ATE45514T1/en
Publication of EP0237042A1 publication Critical patent/EP0237042A1/en
Application granted granted Critical
Publication of EP0237042B1 publication Critical patent/EP0237042B1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F29/00—Mixers with rotating receptacles
    • B01F29/80—Mixers with rotating receptacles rotating about a substantially vertical axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F29/00—Mixers with rotating receptacles
    • B01F29/80—Mixers with rotating receptacles rotating about a substantially vertical axis
    • B01F29/83—Mixers with rotating receptacles rotating about a substantially vertical axis with rotary paddles or arms, e.g. movable out of the receptacle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F33/00—Other mixers; Mixing plants; Combinations of mixers
    • B01F33/80—Mixing plants; Combinations of mixers
    • B01F33/85—Mixing plants with mixing receptacles or mixing tools that can be indexed into different working positions

Definitions

  • the invention relates to a mixing device with at least one mixing container and a use of the mixing device.
  • a generic mixing device is known from DE-PA M 20 052 IVC / 80a.
  • the known mixing device is used to mix concrete or other masses with fixed grain sizes, a rotating mixing vane being arranged in a mixing trough rotating about a vertical axis.
  • tubers or the like are to be comminuted without changing the grain size ratios, for which purpose it is proposed to provide a comminuting device instead of a comminuting device arranged between the mixing wing and the trough wall, which is formed from a rotating shaft with vertically projecting vanes and so on is arranged that its shaft is arranged substantially perpendicular to the trough bottom.
  • the four-armed mixing blade touches the inner wall of the mixing trough at one point during its rotation.
  • a mixing and centrifuging unit is known from German utility model 7 213 810, in which mixing is to take place in a first mixing container and is to be spun in a second mixing container while increasing the speed of the drive motor.
  • the components to be mixed are therefore still placed in standardized beakers and stirred by hand with a spatula-like device until an adequate mixture of the components is achieved.
  • This process is time consuming and costly.
  • hardly any standardized conditions can be achieved for the mixing process, because apart from the mixing time, which would be relatively easy to keep constant, the type of stirring has a significant influence on the mixing result.
  • the object of the invention is to further develop the mixing device known from DE-C 847 423 and to make available a device in which a high mixing quality is achieved under standardized conditions, which in particular also meets the requirements of the paint and varnish industry, whereby Above all, a constant, defined mixture quality should be achieved.
  • the invention proposes a mixing device with the features of claim 1.
  • the mixing tool touches the inner surfaces of the mixing container during mixing, it is first ensured that adhering mixed material is repeatedly removed from these surfaces and fed to the mixing process, so that after a relatively short time there is practically complete mixing.
  • the special design of the stirring blades of the mixing tool which will be described in more detail, is also important.
  • the arrangement of locking means on the mixing container and thus corresponding locking means on the receiving device further ensures that the mixing container and mixing tool are always arranged in a constant, defined association with one another. Due to the mechanization of the entire mixing process and the fixed assignment of the parts of the mixing device, an optimal standardization of the mixing conditions is possible, and only the mixing time and the speed of the relative movement of the mixing tool to the mixing container have to be set. With the device according to the invention, mixtures can now be carried out in a significantly shorter time and with a significantly lower amount of work.
  • the mixing tool is guided in a circular movement grazing along the inner wall of the mixing container.
  • one or more spatulas In an elongated container with straight walls, one or more spatulas, one for each wall section, could be guided linearly along this wall section.
  • the technology provides numerous drives for more complicated container shapes and / or mixing tool or mixing container movements, for example via eccentric controls or the like.
  • a rotationally symmetrical mixing container which can be rotated about an axis is provided and the mixing tool is arranged on another axis which runs parallel and at a distance from the first axis.
  • the mixing tool can be guided with its axis on a circular path to achieve a relative movement.
  • the receiving device preferably comprises a turntable on which the mixing container (s) can be placed and a drive device for the turntable.
  • the turntable can be adapted to the shape of the mixing container it can have, for example, a recess for receiving the mixing container.
  • the drive device for the turntable is preferably an electric motor, either a so-called slow-speed motor or an electric motor connected to a reduction gear or a so-called geared motor, in which the electric motor is interlocked with the gearbox, since the mixing of colors does not require excessively high speeds.
  • the speed can preferably be varied simply and reproducibly using electrical means, for example by varying the voltage or, in the case of AC motors, using leading edge control, and can thus be easily adapted to the desired application, taking into account, for example, the viscosity of a color sample and the desired mixing time.
  • electric motors are particularly well suited for automated operation, in which, for example, a program control takes over the switching on and off and the speed preselection of the electric drive motor for the turntable.
  • recesses can be provided as latching means in the receiving device and latching projections formed on the mixing container corresponding to these recesses.
  • recesses can also be provided in the mixing container, for example, and then latching projections can be provided on the receiving device.
  • the locking means prevents slippage between the mixing container and the receiving device.
  • the receiving device can be provided with a ring.
  • a ring with a larger inner diameter than the outer diameter of the mixing container at the corresponding point can be equipped with additional means for fixing the container in the receiving device, for example with a quick-action clamping device.
  • the mixing tool is preferably rotated in the opposite direction to the rotation of the mixing container.
  • the mixing tool has a central shaft, from which spaced apart stirring blades project radially.
  • Such impellers can be made relatively elastic, so that they fit well against the inner wall and the bottom of the mixing vessel and thus achieve a good wiping effect.
  • a particularly good combination of high strength of the agitator blades in the area of their attachment to the shaft and high flexibility in the outside area, where the agitator blades come into contact with the walls and partly on the bottom of the mixing vessel, is achieved in that the agitator blades are made from a connecting element to the shaft Inner section and an adjoining outer section with greater flexibility than the respective inner section.
  • the quality of the mixture is further increased in that the mixing tool is at least partially designed to achieve a relative movement of the material to be mixed transversely to the relative movement of the mixing tool and the mixing container. If, for example, the mixing container and the mixing tool rotate about two parallel spaced axes, as described above, a further movement, for example of the mixing tool, can be superimposed in the axial direction. This improves, in particular, the mixing of mixtures which consist of a relatively heavy component in a light component in which the heavy component otherwise tends to quickly settle again at the bottom of the mixing vessel.
  • the relative movement of the material to be mixed in the axial direction can also be achieved by appropriate design of the mixing tool.
  • the mixing tool is at least partially helical. However, inclined impeller sections or similar measures can also be provided, which result in suction or pull in the axial direction when the mixing tool rotates.
  • the mixing container and / or the mixing tool can be moved in the direction of the axis of the mixing container or the axis of the mixing tool.
  • this can be advantageous with a small stroke (for example intermittent) to achieve the above-mentioned relative movement in the axial direction.
  • the main purpose of this measure is to immerse the stirring tool in the mixing container after the mixing container with the mixture has been placed on it.
  • either the mixing container can be stationary and the mixing tool can be axially movable, for example like a drilling tool in a column drilling machine.
  • a stand which runs at least partially parallel to the axis of the mixing container can be provided, on which a support arm is slidably mounted, on which a support device for the mixing container is fixed.
  • a mechanical structure is inexpensive to manufacture and has a long service life, even under intense stress due to numerous lifting movements of the support arm along the stand.
  • the carrying device has a housing in which the rotating device for the mixing container is arranged, for example an electric motor intended for driving and the turntable are encapsulated and protected against external influences and follow the movement of the carrying arm in a simple manner.
  • a further axis running parallel to the axis of the mixing tool which is slidably mounted in a support arm and is fixed at one end to a housing which is formed in a section facing away from the further axis for receiving the mixing tool.
  • this housing can accommodate the drive device for the mixing tool, which can have an electric motor similar to that in combination Menhang with the drive of the mixing container was discussed. In this way, the housing can be lifted with the mixing tool by moving the further axis in the support arm.
  • the housing is designed to be pivotable about the further axis, several advantages can be achieved.
  • the pivotability of the housing with the mixing tool makes maintenance and cleaning easier as compared to the rotating plate for the mixing vessel as a result of the improved accessibility of the individual parts.
  • an arrangement of several turntables for each mixing container can be achieved, which are grouped approximately in a star shape around a stand.
  • only one mixing tool drive is required for several mixing containers and associated drives, which is swiveled successively over the different mixing stations.
  • the length of the mixing tool should be adapted to the dimensions of the mixing container. This is initially necessary solely because the mixing tool has to protrude to the bottom of the mixing container so that a stripping effect also takes place there. This minimum length is therefore determined by the mixing tank height. It may be desirable in series trials, in particular, to seal the mixing containers with a lid after the mixing in order to store them for a certain time. For this purpose, the mixing tool and the mixing container have to be separated from one another, for example by means of one of the lifting movements mentioned, the mixing tool usually remaining above the mixing container. If the container is now removed, paint residues on the mixing tool can drip either onto the hand of an operator or onto a lid attached to the mixing container, which is at least annoying. Then the mixing tool, to which residues of the material to be mixed stick, is removed and, for example, placed in a waste container, whereby drops of paint can also contaminate the surroundings. The resulting pollution must be removed and thus takes time and money.
  • the mixing tool is designed such that it can be latched in a receiving device in accordance with a further advantageous embodiment of the invention. Then not only is the insertion of the mixing tool fast, but it can also be easily ejected from the holder by a suitable ejection device which overcomes the catch, whereby the mixing tool simply falls into the mixing container and does not touch it at all by hand must be after it is contaminated with the mix.
  • a suitable latching device can consist, for example, in that the shaft of the mixing tool has a radially circumferential latching groove, into which a radially movable latching mandrel of the receiving device engages. The locking pin can be pulled out of the groove pneumatically or via an electromagnet and thus release the tool, which is then conveyed into the mixing container under the action of a pneumatically or electromagnetically actuated ejection device.
  • the last-mentioned measures are, of course, only useful if the mixing tool is designed as a disposable item, that is, in particular, it is not expensive.
  • the mixing tool is formed in one piece, since the manufacturing costs then decrease, in particular if the mixing tool is made of plastic in accordance with a further advantageous embodiment of the invention.
  • Mixing tools made in one piece from plastic by injection molding are so inexpensive that they can be regarded as disposable items, which makes it easier to replace the mixing tools as described above.
  • the mixing container can also be designed as a disposable article and then preferably consists of plastic and can thus be produced, for example, by injection molding.
  • the plastics for the mixing tool and the mixing container which are particularly suitable for use with paints and varnishes are polyethylene or polypropylene, in particular because of the solvent resistance of these two plastics.
  • Such plastic containers are usually supplied in stacks of 100 or more. If the mixing containers made of plastic only have a simple, slightly conical shape, it can happen that they stick together so tightly in this stacked package that the removal of individual containers is at least tedious.
  • the locking projections on the mixing container can be designed for stacking the mixing container.
  • the latching projections therefore fulfill a multiple function, firstly as already described at the beginning for latching the mixing containers on a suitable holding device for the torsionally rigid coupling and secondly for stacking the mixing containers.
  • a mixing device is generally designated by the reference number 10.
  • a mixing cup 12 with a cup wall 14 and a cup base 16 is received in a retaining ring 18 which is fixed on a turntable 22 via a support 20.
  • This retaining ring can, depending on the cup 12, have latching means which are explained in more detail below in connection with FIG. 3.
  • suction openings can be provided there, for example, in which one is not shown Device, for example a vacuum pump, negative pressure is generated, whereby the cup base 16 is held on the turntable 22 by suction.
  • the turntable 22 is centrally connected to an axis 24 of an electric motor 26 which drives the turntable.
  • the turntable 22 and the motor 26 are laterally and downwardly surrounded by a housing 28, which is continued laterally in a support arm 30.
  • a fitting bore is provided in the support arm, through which a stand 32 projects.
  • a further support arm 34 projects laterally, in which a fitting bore for receiving an axis 40 is provided, at the other end of which a housing 42 is arranged.
  • the axis 40 can be moved relative to the support arm 34.
  • a suitable lifting device can also be provided for this, which is not shown, for example as in the height adjustment of a column drilling machine.
  • An electric motor 44 and an angular gear 48 are arranged in the housing 42 and are connected to one another via an axis 46. On the output side of the angular gear 48, a receptacle 50 for a mixing tool 52 is provided.
  • the mixing tool 52 is designed as a paddle stirrer and has a central shaft 54, from which four agitator blades 56, 58, 60 and 62 extend.
  • the wing 58 protrudes from the plane of the paper and the wing 62 protrudes into the plane of the paper.
  • a holding and ejecting device for the mixing tool 52 can be arranged in the receiving device 50, as was described at the beginning.
  • the shaft 54 of the mixing tool 52 is then designed accordingly, for example with a radially circumferential locking groove.
  • FIG. 2 The directions of rotation are further illustrated by FIG. 2, where a top view of the cup 12 with the upper edge of the wall 14 and the bottom 16 is shown.
  • the axis A which is also shown in FIG. 1, extends through the center of the cup.
  • the axis B of the mixing tool 52 runs parallel to this. From FIG. 2 it is clear that even when the paddle stirrer 52 is stationary, the rotary movement of the cup 12 results in a stripping effect on the inner walls and on the bottom, see FIG. 1 of the cup 12. However, the wiping effect is increased to a considerable extent if the paddle stirrer 52 also rotates, as indicated by the corresponding arrows in FIG. 1 and FIG. 2.
  • FIG. 3 shows a retaining ring 18 according to FIG. 1, which is provided with three latching recesses 70, 72 and 74 which open towards the inside of the ring.
  • Correspondingly designed locking projections 64, 66 and 68 engage in these recesses 70, 72 and 74 and are attached to the outer circumference of the cup wall 14.
  • One of these locking projections (72) is shown in the sectional view of the cup 12 in the left half of FIG. 1. The mutual locking of the cup 12 in the holding ring 18 ensures that the cup 12 follows the rotary movement of the turntable 22 and the holding ring 18 connected to the turntable 22 via the support 20 without slippage.
  • FIG. 4 shows a top view of a mixing device in which three container stations 22A, 22B and 22C are provided. These container stations 22A, 22B and 22C each correspond to a turntable 22 according to FIG. 1. Otherwise, the mixing device shown in FIG. 4 is identical in construction to the device shown in FIG. The axis 40 is designed to be rotatable and thus allows the housing 42 to be pivoted. FIG.
  • FIG. 4 shows, for example, a pivoting of the housing 42 with the receiving device 50 for the impeller from a cup station 22C to a cup station 22B, that is to say in the direction of the arrow 89
  • Centers of the three machining stations 22A, 22B and 22C lie here on a circle around the center of the axis 40, which has a radius which corresponds to the distance between the center of the axis 40 and the axis A in FIG. 1.
  • the turning circle is designated A 'in FIG.
  • FIG. 5a shows a vertical longitudinal section in a first and FIG. 5b a corresponding one vertical longitudinal section in a representation rotated by 90 degrees around the central axis in relation to FIG. 5a
  • FIG. 5c is a plan view of the mixing tool 120.
  • the mixing tool 120 has two elongated shaft ribs 122, 124 which are arranged in a star shape, that is to say offset from one another by 90 degrees, which is particularly clear from Figure 5c.
  • the upper section of the shaft rib 124 is provided with two recesses 126, 128 on the edge, and accordingly the shaft rib 122 is provided with two recesses, of which only one recess 130 can be seen in the illustrations in FIGS. 5a and 5b. These recesses 126, 128 and 130 serve as latching recesses for latching into correspondingly designed latching projections of the receiving device 50 shown in FIG. 1.
  • the two shaft ribs 122, 124 of the mixing tool 120 together form the shaft of the mixing tool 120 and are furthermore interconnected via reinforcing ribs 132 to increase the torsional rigidity connected.
  • the mixing tool 120 has four agitator blades 134, 136, 138 and 140, of which two agitator blades (134, 136) on one side of the shaft rib 124 project outwards and the other two agitator blades (138, 140) on the opposite edge of the Shaft rib 124. No stirring blades are provided on the other shaft rib 122.
  • Each of the agitator blades 134 to 140 has a relatively rigid inner section and a relatively flexible outer section adjoining it outward. This ensures that the agitator blades 134 to 140 as a whole are relatively rigid and therefore develop a good stirring effect, but nevertheless nestle very well against the inner wall of a container due to the flexible outer sections.
  • the impeller 134 is provided with an inner section 134a and a relatively short outer section 134b, which adjoins it radially.
  • the inner section 134a and the outer section 134b are formed in one piece to form a stirring blade 134 and this stirring blade 134 is in turn formed in one piece with the shaft rib 124 and the mixing tool 120 as a whole.
  • the outer section 134b is significantly tapered with respect to the more rigid inner section 134a.
  • the impeller 136 has an inner section 136a and an outer section 136b; the impeller 138 is provided with an inner portion 138a and an outer portion 138b, and likewise the impeller 140 with an inner portion 140a and an outer portion 140b.
  • the offset arrangement of the agitator blades is clear from FIG. 5, namely the agitator blades are attached to the shaft rib 124 in such a way that the lower agitator blade 140 is arranged on one side, above and at a distance from which the upper agitator blade 138 is located. On the opposite side, covering the distance between the agitator blades 140 and 138, the agitator blade 136 is attached and, above the agitator blade 136, again kept at a distance, the agitator blade 134.
  • the mixing tool 120 is rotated about the central axis, the four agitator blades 134 sweep over 140 therefore the entire area of the inner wall of a mixing bowl without leaving a free space between them.
  • the impellers are not aligned vertically, but rather are attached obliquely, as is shown with the aid of the two impellers 138, 140; in this way, when the mixing tool 120 is rotated about the central axis, an upward or downward movement of the mixed material is also brought about.
  • the inclination of the agitator blades is further evident from the view of the mixing tool 120 according to FIG. 5c, in which the two uppermost, inclined agitator blades 134, 138 can be seen.
  • FIG. 6 A further advantageous embodiment of a mixing tool 150 is shown in FIG. 6, again in a vertical longitudinal section (FIG. 6a), in contrast a vertical longitudinal section rotated by 90 degrees (FIG. 6b) and in a top view (FIG. 6c).
  • the shaft of the mixing tool 150 is formed by a hollow cylinder 152 which tapers from top to bottom.
  • agitator blades 154, 156, 158 and 160 are arranged in one piece, which otherwise are the same as the agitator blades 134 to 140 discussed above in connection with FIG. 5; in particular, the agitator blades 154 to 160 are provided with inner and thinner, more flexible outer sections.
  • the hollow cylinder 152 has a V-shaped cutout 162, at the tip of which a circular latching recess 164 is formed.
  • a transverse axis of a receiving device 50 FIG. 1 can snap into this latching recess 164.
  • a hollow cylinder 152 like a mixing tool 120 provided with shaft ribs, already has a relatively high bending stiffness in a one-piece design made of a suitable plastic. The bending stiffness can also be increased considerably if the hollow cylinder 152 is placed over a corresponding mandrel of the receiving device 50.
  • the mandrel can also be provided with an ejection device.
  • the mandrel is preferably designed as a hollow shaft through which a guide axis projects concentrically. If the hollow cylinder 152 is then fixed by a detent in the detent recess 164, actuation of the guide axis downward (mechanical, pneumatic, electrical) is sufficient to detach the entire mixing tool 150 and to detach it from the holding device 50.
  • a further advantageous embodiment of the mixing device according to the invention can be seen from the upper left part of FIG. 1.
  • Electrical connecting lines 100, 102 of the electric drive motor 44 are led via an ammeter 104 to connecting terminals 110, 112, to which a supply voltage U for the electric motor 44 is applied. If the electric motor 44 is put into operation, then a certain Ver Supply current required to rotate the mixing tool 52 (or 120 or 150), depending, for example, on the transmission losses in the gear 48 and on the frictional resistance of the impellers in the cup 12. If material to be mixed is now entered into the cup 12, additional movement is required to move it Power required, which is reflected in an increased current consumption of the motor 44 and can be determined by an increased current using the ammeter.
  • the pointer 108 therefore moves on from a first position of a pointer 108 on a scale 106 of the ammeter.
  • This additional current consumption is therefore a measure of the viscosity of the mix. This makes it easy to determine the viscosity of the mix, if necessary after prior calibration.
  • by monitoring the viscosity in this way it is possible to further standardize the mixing process, in particular in the case of larger mixing series. For example, when mixing two mixes of different viscosity, the mixing can be carried out until the viscosity of the resulting mixture no longer changes significantly.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)

Abstract

1. Mixing device with 1.1 at least one mixing vessel (12), 1.1.1 being detachably secured on a receiving means (18, 20), but 1.1.2 twist safe by locking means (64, 66, 68) between mixing vessel (12) and receiving means (18, 20) and 1.2 a rotatable mixing tool (52, 120, 150), with 1.2.1 a central shaft (54, 122, 124, 152) and 1.2.2 elastic stirring wings (56, 58, 60, 62, 134, 136, 138, 140) protruding from said shaft and arranged in spaced relationship, 1.2.3 each comprising an inner section (134a, 136a, 138a, 140a) adjacent to said shaft (122, 124) and an annexed outer section (134b, 136b, 138b, 140b) being substantially more flexible than said inner section (134a, 136a, 138a, 140a), wherein 1.3 said mixing tool (52, 120, 150) or its stirring wings (52, 58, 60, 62, 134, 136, 138, 140) respectively are shaped at least partially transverse to said relative motion of said mixing tool (52, 120, 150) with respect to said mixing vessel (12) and arranged in such a way as to contact the inner wall of the mixing vessel (12) while rotating.

Description

Die Erfindung betrifft eine Mischvorrichtung mit mindestens einem Mischbehälter sowie eine Verwendung der Mischvorrichtung.The invention relates to a mixing device with at least one mixing container and a use of the mixing device.

Eine gattungsgemäße Mischvorrichtung ist aus der DE-PA M 20 052 IVC/80a bekannt. Die bekannte Mischvorrichtung dient zum Mischen von Beton oder anderen Massen mit festgelegten Korngrößen, wobei in einem, um eine lotrechte Achse rotierenden Mischtrog ein rotierender Mischflügel angeordnet ist. Mit der bekannten Mischvorrichtung sollen Knollen oder dergleichen zerkleinert werden, ohne die Korngrößenverhältnisse zu ändern, wozu vorgeschlagen wird, an Stelle eines zwischen Mischflügel und Trogwand angeordneten Zerkleinerungsgerätes nach Art eines Kollers ein Zerkleinerungsgerät vorzusehen, das aus einer umlaufenden Welle mit senkrecht abstehenden Flügeln gebildet und so angeordnet ist, daß seine Welle im wesentlichen senkrecht zum Trogboden angeordnet ist. Nach dem Ausführungsbeispiel tangiert der vierarmige Mischflügel die Innenwandung des Mischtroges an einer Stelle während seines Umlaufes.A generic mixing device is known from DE-PA M 20 052 IVC / 80a. The known mixing device is used to mix concrete or other masses with fixed grain sizes, a rotating mixing vane being arranged in a mixing trough rotating about a vertical axis. With the known mixing device tubers or the like are to be comminuted without changing the grain size ratios, for which purpose it is proposed to provide a comminuting device instead of a comminuting device arranged between the mixing wing and the trough wall, which is formed from a rotating shaft with vertically projecting vanes and so on is arranged that its shaft is arranged substantially perpendicular to the trough bottom. According to the exemplary embodiment, the four-armed mixing blade touches the inner wall of the mixing trough at one point during its rotation.

Weiterhin ist aus dem deutschen Gebrauchsmuster 7 213 810 eine Misch- und Zentrifugiereinheit bekannt, bei der in einem ersten Mischbehälter gemischt und in einem zweiten Mischbehälter, unter Drehzahlerhöhung des Antriebsmotors, geschleudert werden soll.Furthermore, a mixing and centrifuging unit is known from German utility model 7 213 810, in which mixing is to take place in a first mixing container and is to be spun in a second mixing container while increasing the speed of the drive motor.

Es sind Anwendungsbereiche bekannt, bei denen eine besonders hohe Mischgüte (Homogenität) gefordert wird, zum Beispiel beim Mischen von Farben. Farben für Anstreichzwecke, beispielsweise Lacke, werden zur Erzielung bestimmter Farbtöne aus Farben unterschiedlichen Farbtons gemischt. Weitere Mischungsvorgänge bei Farben und Lacken finden dort statt, wo Farbpigmente in ein zumindest teilweise flüchtiges Trägermaterial eingebracht werden. Es ist insbesondere bei der Herstellung neuer Farben und Lacke erforderlich, die zur Ermittlung der Eigenschaften bezüglich Haftfähigkeit, Trocknung, erzielbarer Farbtonpaletten usw. eine Vielzahl von Farbproben unter standardisierten Bedingungen zu mischen, um die einzelnen Proben untereinander und mit anderen Proben vergleichen zu können.Areas of application are known in which a particularly high mixing quality (homogeneity) is required, for example when mixing colors. Paints for painting purposes, for example lacquers, are mixed from colors of different hues in order to achieve specific hues. Further mixing processes for paints and varnishes take place where color pigments are introduced into an at least partially volatile carrier material. It is particularly necessary in the production of new paints and varnishes to mix a large number of color samples under standardized conditions in order to determine the properties with regard to adhesiveness, drying, achievable color palettes, in order to be able to compare the individual samples with one another and with other samples.

Eine Maschine zum Mischen von Farben beschreibt die DE-C 847 423. Der Rührer verläuft dort jedoch mittig im Mischbehälter und kann weder Material abstreifen, das an der Innenwand des Mischbehälters anhaftet, noch kann er eine nennenswerte Vertikaldurchmischung sicherstellen, insbesondere nicht im Wandbereich.A machine for mixing paints is described in DE-C 847 423. However, the stirrer runs there in the middle of the mixing container and cannot strip off material that adheres to the inner wall of the mixing container, nor can it ensure significant vertical mixing, especially not in the wall area.

Bei Farben und Lacken werden deshalb noch heute die zu mischenden Komponenten in standardisierte Becher gegeben und von Hand mit einem spatel- ähnlichen Gerät solange gerührt, bis eine ausreichende Mischung der Komponenten erzielt ist. Dieses Verfahren ist zeit- und kostenaufwendig. Außerdem lassen sich kaum standardisierte Bedingungen für den Mischvorgang erzielen, weil abgesehen von der Mischungszeit, die relativ einfach konstant zu halten wäre, die Art des Rührens wesentlich das Mischergebnis beeinflußt.For paints and varnishes, the components to be mixed are therefore still placed in standardized beakers and stirred by hand with a spatula-like device until an adequate mixture of the components is achieved. This process is time consuming and costly. In addition, hardly any standardized conditions can be achieved for the mixing process, because apart from the mixing time, which would be relatively easy to keep constant, the type of stirring has a significant influence on the mixing result.

Der Erfindung liegt die Aufgabe zugrunde, die aus der DE-C 847 423 bekannte Mischvorrichtung weiterzuentwickeln und eine Vorrichtung zur Verfügung zu stellen, bei der eine hohe Mischungsgüte unter standardisierten Bedingungen erreicht wird, die insbesondere auch den Anforderungen der Farben- und Lackindustrie genügt, wobei vor allem eine gleichbleibende definierte Mischungsgüte erreicht werden soll.The object of the invention is to further develop the mixing device known from DE-C 847 423 and to make available a device in which a high mixing quality is achieved under standardized conditions, which in particular also meets the requirements of the paint and varnish industry, whereby Above all, a constant, defined mixture quality should be achieved.

Die Erfindung schlägt dazu eine Mischvorrichtung mit den Merkmalen des Anspruches 1 vor.To this end, the invention proposes a mixing device with the features of claim 1.

Dadurch, daß das Mischwerkzeug beim Mischen die Innenflächen des Mischbehälters berührt, wird zunächst sichergestellt, daß anhaftendes Mischgut von diesen Flächen immer wieder neu entfernt und dem Mischvorgang zugeführt wird, so daß sich nach relativ kurzer Zeit eine praktisch vollständige Durchmischung ergibt. Dabei ist auch die spezielle Ausbildung der Rührflügel des Mischwerkzeuges von Bedeutung, die noch näher beschrieben wird. Durch die Anordnung von Rastmitteln am Mischbehälter und damit korrespondierenden Rastmitteln an der Aufnahmeeinrichtung wird weiter erreicht, daß Mischbehälter und Mischwerkzeug stets in gleichbleibender definierter Zuordnung zueinander angeordnet sind. Durch die Mechanisierung des gesamten Mischvorgangs und die feste Zuordnung der Teile der Mischvorrichtung ist eine optimale Standardisierung der Mischbedingungen möglich, und es muß nur noch die Mischzeit und die Geschwindigkeit der Relativbewegung des Mischwerkzeuges zum Mischbehälter eingestellt werden. Mit der erfindungsgemäßen Vorrichtung lassen sich Mischungen nunmehr in wesentlich kürzerer Zeit und mit wesentlich geringerem Arbeitsaufwand durchführen.Characterized in that the mixing tool touches the inner surfaces of the mixing container during mixing, it is first ensured that adhering mixed material is repeatedly removed from these surfaces and fed to the mixing process, so that after a relatively short time there is practically complete mixing. The special design of the stirring blades of the mixing tool, which will be described in more detail, is also important. The arrangement of locking means on the mixing container and thus corresponding locking means on the receiving device further ensures that the mixing container and mixing tool are always arranged in a constant, defined association with one another. Due to the mechanization of the entire mixing process and the fixed assignment of the parts of the mixing device, an optimal standardization of the mixing conditions is possible, and only the mixing time and the speed of the relative movement of the mixing tool to the mixing container have to be set. With the device according to the invention, mixtures can now be carried out in a significantly shorter time and with a significantly lower amount of work.

Bei der Ausführungsform nach Anspruch 2 ist vorgesehen, daß das Mischwerkzeug in einer Kreisbewegung streifend entlang der Innenwand des Mischbehälters geführt wird.In the embodiment according to claim 2 it is provided that the mixing tool is guided in a circular movement grazing along the inner wall of the mixing container.

Auch könnte in einem länglichen Behälter mit geraden Wänden ein Spatel oder mehrere Spatel, einer für jeden Wandabschnitt, linear streifend entlang dieses Wandabschnitts geführt werden. Für kompliziertere Behälterformen und/oder Mischwerkzeug- oder Mischbehälterbewegungen stellt die Technik zahlreiche Antriebe zur Verfügung, beispielsweise über Exzentersteuerungen oder ähnliches.In an elongated container with straight walls, one or more spatulas, one for each wall section, could be guided linearly along this wall section. The technology provides numerous drives for more complicated container shapes and / or mixing tool or mixing container movements, for example via eccentric controls or the like.

Bei einer vorteilhaften Ausführungsform der Mischvorrichtung ist ein um eine Achse drehbarer rotationssymmetrischer Mischbehälter vorgesehen und das Mischwerkzeug auf einer anderen Achse angeordnet, welche parallel und im Abstand zur ersten Achse verläuft. Zur Erzielung einer Relativbewegung kann in diesem Fall das Mischwerkzeug mit seiner Achse auf einer Kreisbahn geführt werden.In an advantageous embodiment of the mixing device, a rotationally symmetrical mixing container which can be rotated about an axis is provided and the mixing tool is arranged on another axis which runs parallel and at a distance from the first axis. In this case, the mixing tool can be guided with its axis on a circular path to achieve a relative movement.

Vorzugsweise umfaßt die Aufnahmeeinrichtung einen Drehteller, auf welchen der oder die Mischbehälter aufsetzbar ist (sind), und eine Antriebsvorrichtung für den Drehteller. Hierbei kann der Drehteller an die Form des Mischbehälters angepaßt sein, er kann beispielsweise eine Ausnehmung zur Aufnahme des Mischbehälters aufweisen. Die Antriebsvorrichtung für den Drehteller ist vorzugsweise ein Elektromotor, entweder ein sogenannter Langsamläufer oder ein an ein Untersetzungsgetriebe angeschlossener Elektromotor oder ein sogenannter Getriebemotor, bei welchem der Elektromotor mit dem Getriebe verblockt ist, da zum Mischen von Farben keine allzu hohen Drehzahlen erforderlich sind. Die Drehzahl läßt sich vorzugsweise mit elektrischen Mitteln, etwa über Variation der Spannung oder bei Wechselspannungsmotoren über Phasenanschnittssteuerung, einfach und reproduzierbar variieren und so dem gewünschten Einsatzzweck, unter Berücksichtigung beispielsweise der Viskosität einer Farbprobe und der gewünschten Mischungszeit, einfach anpassen. Weiterhin eignen sich elektrische Motoren besonders gut für einen automatisierten Betrieb, bei dem beispielsweise eine Programmsteuerung das Ein- und Ausschalten sowie die Drehzahlvorwahl des elektrischen Antriebsmotors für den Drehteller übernimmt.The receiving device preferably comprises a turntable on which the mixing container (s) can be placed and a drive device for the turntable. Here, the turntable can be adapted to the shape of the mixing container it can have, for example, a recess for receiving the mixing container. The drive device for the turntable is preferably an electric motor, either a so-called slow-speed motor or an electric motor connected to a reduction gear or a so-called geared motor, in which the electric motor is interlocked with the gearbox, since the mixing of colors does not require excessively high speeds. The speed can preferably be varied simply and reproducibly using electrical means, for example by varying the voltage or, in the case of AC motors, using leading edge control, and can thus be easily adapted to the desired application, taking into account, for example, the viscosity of a color sample and the desired mixing time. Furthermore, electric motors are particularly well suited for automated operation, in which, for example, a program control takes over the switching on and off and the speed preselection of the electric drive motor for the turntable.

Erfindungsgemäß können als Rastmittel in der Aufnahmevorrichtung Ausnehmungen und an dem Mischbehälter korrespondierend zu diesen Ausnehmungen ausgebildete Rastvorsprünge vorgesehen sein. Selbstverständlich können auch beispielsweise in dem Mischbehälter Ausnehmungen und dann an der Aufnahmevorrichtung Rastvorsprünge vorgesehen sein. Durch die Rastmittel wird ein Schlupf zwischen Mischbehälter und Aufnahmeeinrichtung vermieden.According to the invention, recesses can be provided as latching means in the receiving device and latching projections formed on the mixing container corresponding to these recesses. Of course, recesses can also be provided in the mixing container, for example, and then latching projections can be provided on the receiving device. The locking means prevents slippage between the mixing container and the receiving device.

Ebenso kann die Aufnahmevorrichtung mit einem Ring versehen sein. Ein solcher Ring mit einem größeren Innendurchmesser als dem Außendurchmesser des Mischbehälters an der entsprechenden Stelle kann mit zusätzlichen Mitteln zur Festlegung des Behälters in der Aufnahmevorrichtung ausgerüstet sein, etwa mit einer Schnellspannvorrichtung Vorzugsweise erfolgt die Drehung des Mischwerkzeuges gegenläufig zur Drehung des Mischbehälters.Likewise, the receiving device can be provided with a ring. Such a ring with a larger inner diameter than the outer diameter of the mixing container at the corresponding point can be equipped with additional means for fixing the container in the receiving device, for example with a quick-action clamping device. The mixing tool is preferably rotated in the opposite direction to the rotation of the mixing container.

Gemäß Anspruch 1 weist das Mischwerkzeug einen zentralen Schaft auf, von dem im Abstand zueinander angeordnete Rührflügel radial abragen. Derartige Rührflügel können relativ elastisch ausgebildet sein, so daß sie sich gut an die Innenwand und den Boden des Mischgefäßes anlegen und so eine gute Abstreifwirkung erzielen. Eine besonders gute Kombination von hoher Festigkeit der Rührflügel im Bereich ihrer Befestigung am Schaft und hoher Flexibilität im Außenbereich, wo die Rührflügel mit den Wänden und teilweise am Boden des Mischgefäßes in Berührung kommen, wird dadurch erreicht, daß die Rührflügel aus einem an dem Schaft anschließenden Innenabschnitt und einem hieran anschließenden Außenabschnitt mit höherer Flexibilität als der jeweilige Innenabschnitt bestehen.According to claim 1, the mixing tool has a central shaft, from which spaced apart stirring blades project radially. Such impellers can be made relatively elastic, so that they fit well against the inner wall and the bottom of the mixing vessel and thus achieve a good wiping effect. A particularly good combination of high strength of the agitator blades in the area of their attachment to the shaft and high flexibility in the outside area, where the agitator blades come into contact with the walls and partly on the bottom of the mixing vessel, is achieved in that the agitator blades are made from a connecting element to the shaft Inner section and an adjoining outer section with greater flexibility than the respective inner section.

Die Mischungsgüte wird dadurch weiter erhöht, daß das Mischwerkzeug zur Erzielung einer Relativbewegung des Mischguts zumindest teilweise quer zur Relativbewegung des Mischwerkzeuges und des Mischbehälters ausgebildet ist. Drehen sich wie voranstehend beschrieben beispielsweise der Mischbehälter und das Mischwerkzeug um zwei parallele beabstandete Achsen, so kann zusätzlich hierzu eine weitere Bewegung beispielsweise des Mischwerkzeuges in axialer Richtung überlagert werden. Dies verbessert insbesondere die Durchmischung von Gemischen, die aus einer relativ schweren Komponente in einer Leichtkomponente bestehen bei denen sonst die schwere Komponente dazu neigt, sich schnell wieder am Boden des Mischgefäßes abzusetzen. Die Relativbewegung des Mischguts in axialer Richtung kann aber auch durch entsprechende Ausgestaltung des Mischwerkzeuges erreicht werden. Gemäß einer weiteren vorteilhaften Ausgestaltung der Erfindung ist hierzu das Mischwerkzeug zumindest teilweise schneckenförmig ausgebildet. Es können aber auch schräg verlaufende Rührflügelabschnitte oder ähnliche Maßnahmen vorgesehen werden, die einen Sog oder Zug in axialer Richtung zur Folge haben, wenn sich das Mischwerkzeug dreht.The quality of the mixture is further increased in that the mixing tool is at least partially designed to achieve a relative movement of the material to be mixed transversely to the relative movement of the mixing tool and the mixing container. If, for example, the mixing container and the mixing tool rotate about two parallel spaced axes, as described above, a further movement, for example of the mixing tool, can be superimposed in the axial direction. This improves, in particular, the mixing of mixtures which consist of a relatively heavy component in a light component in which the heavy component otherwise tends to quickly settle again at the bottom of the mixing vessel. The relative movement of the material to be mixed in the axial direction can also be achieved by appropriate design of the mixing tool. According to a further advantageous embodiment of the invention, the mixing tool is at least partially helical. However, inclined impeller sections or similar measures can also be provided, which result in suction or pull in the axial direction when the mixing tool rotates.

Bei einer weiteren vorteilhaften Ausgestaltung der Erfindung ist vorgesehen, daß der Mischbehälter und/oder das Mischwerkzeug in Richtung der Achse des Mischbehälters beziehungsweise der Achse des Mischwerkzeuges bewegbar ist. Dies kann einerseits mit geringem Hub zur (beispielsweise intermittierenden) Erzielung der voranstehend genannten Relativbewegung in axialer Richtung vorteilhaft sein. Der Hauptzweck dieser Maßnahme liegt jedoch darin, nach Aufsetzen des Mischbehälters mit dem Mischgut das Rührwerkzeug in den Mischbehälter einzutauchen. Hierzu kann entweder der Mischbehälter feststehen und das Mischwerkzeug, etwa wie ein Bohrwerkzeug bei einer Säulenbohrmaschine, axial bewegbar sein. Es ist jedoch prinzipiell genausogut möglich, das Mischwerkzeug starr und die Aufnahmevorrichtung für den Mischbehälter hubbewegbar auszugestalten; auch eine Kombination beider Maßnahmen ist möglich.In a further advantageous embodiment of the invention it is provided that the mixing container and / or the mixing tool can be moved in the direction of the axis of the mixing container or the axis of the mixing tool. On the one hand, this can be advantageous with a small stroke (for example intermittent) to achieve the above-mentioned relative movement in the axial direction. The main purpose of this measure, however, is to immerse the stirring tool in the mixing container after the mixing container with the mixture has been placed on it. For this purpose, either the mixing container can be stationary and the mixing tool can be axially movable, for example like a drilling tool in a column drilling machine. In principle, however, it is equally possible to make the mixing tool rigid and the receiving device for the mixing container movable in terms of stroke; a combination of both measures is also possible.

Weiterhin kann ein zumindest teilweise zur Achse des Mischbehälters parallel verlaufender Ständer vorgesehen werden, an dem ein Tragarm gleitend verschieblich gelagert ist, an dem eine Tragvorrichtung für den Mischbehälter festgelegt ist. Ein derartiger mechanische Aufbau ist kostengünstig zu fertigen und hat eine lange Lebensdauer, auch bei intensiver Beanspruchung durch zahlreiche Hubbewegungen des Tragarms entlang dem Ständer.Furthermore, a stand which runs at least partially parallel to the axis of the mixing container can be provided, on which a support arm is slidably mounted, on which a support device for the mixing container is fixed. Such a mechanical structure is inexpensive to manufacture and has a long service life, even under intense stress due to numerous lifting movements of the support arm along the stand.

Weist die Tragvorrichtung ein Gehäuse auf, in welchem die Drehvorrichtung für den Mischbehälter angeordnet ist, sind beispielsweise ein zum Antrieb bestimmter Elektromotor und der Drehteller gekapselt und gegen äußere Einwirkungen geschützt und folgen auf einfache Weise der Bewegung des Tragarms.If the carrying device has a housing in which the rotating device for the mixing container is arranged, for example an electric motor intended for driving and the turntable are encapsulated and protected against external influences and follow the movement of the carrying arm in a simple manner.

Es ist auch vorteilhaft, eine zur Achse des Mischwerkzeuges parallel verlaufende weitere Achse anzuordnen, die in einem Tragarm gleitend verschieblich gelagert und an einem Ende an einem Gehäuse festgelegt ist, das in einem der weiteren Achse abgewandten Abschnitt zur Aufnahme des Mischwerkzeuges ausgebildet ist. Gleichzeitig kann dieses Gehäuse die Antriebsvorrichtung für das Mischwerkzeug aufnehmen, die einen ähnlichen Elektromotor aufweisen kann, wie er im Zusammenhang mit dem Antrieb des Mischbehälters besprochen wurde. Auf diese Weise kann das Gehäuse mit dem Mischwerkzeug durch Verschiebung der weiteren Achse in dem Tragarm hubbewegt werden.It is also advantageous to arrange a further axis running parallel to the axis of the mixing tool, which is slidably mounted in a support arm and is fixed at one end to a housing which is formed in a section facing away from the further axis for receiving the mixing tool. At the same time, this housing can accommodate the drive device for the mixing tool, which can have an electric motor similar to that in combination Menhang with the drive of the mixing container was discussed. In this way, the housing can be lifted with the mixing tool by moving the further axis in the support arm.

Sofern das Gehäuse um die weitere Achse schwenkbar ausgebildet ist, lassen sich mehrere Vorteile erreichen. Die Verschwenkbarkeit des Gehäuses mit dem Mischwerkzeug erleichtert gegenüber dem Drehteller für das Mischgefäß die Wartung und Reinigung in Folge der verbesserten Zugänglichkeit der Einzelteile. Darüberhinaus, und dies ist besonders bedeutsam, läßt sich eine Anordnung mehrerer Drehteller für jeweils einen Mischbehälter erreichen, die etwa sternförmig um einen Ständer gruppiert sind. Dann ist für mehrere Mischbehälter und zugehörige Antriebe nur ein einziger Mischwerkzeugsantrieb erforderlich, der nacheinander über die verschiedenen Mischstationen geschwenkt wird. Hierzu ist vorzugsweise vorgesehen, damit die Einzelpositionen einfach anzusteuern sind, Rastmittel zum Rasten in die Einraststellungen, die diesen Positionen entsprechen, etwa am Gehäuse, der weiteren Achse oder dem von dieser Achse durchragten Tragarm anzuordnen.If the housing is designed to be pivotable about the further axis, several advantages can be achieved. The pivotability of the housing with the mixing tool makes maintenance and cleaning easier as compared to the rotating plate for the mixing vessel as a result of the improved accessibility of the individual parts. In addition, and this is particularly important, an arrangement of several turntables for each mixing container can be achieved, which are grouped approximately in a star shape around a stand. Then only one mixing tool drive is required for several mixing containers and associated drives, which is swiveled successively over the different mixing stations. For this purpose it is preferably provided, so that the individual positions are easy to control, to arrange latching means for latching into the latching positions which correspond to these positions, for example on the housing, the further axis or the support arm protruding through this axis.

Die Länge des Mischwerkzeugs sollte an die Abmessungen des Mischbehälters angepaßt sein. Dies ist zunächst allein von daher erforderlich, daß das Mischwerkzeug bis zum Boden des Mischbehälters ragen muß, damit auch dort eine Abstreifwirkung stattfindet. Diese Mindestlänge ist daher durch die Mischbehälterhöhe vorgegeben. Es kann insbesondere bei Serienversuchen gewünscht sein, die Mischbehälter nach erfolgter Mischung mit einem Deckel zu verschließen, um sie für eine gewisse Zeit zu lagern. Hierzu müssen das Mischwerkzeug und der Mischbehälter voneinander getrennt werden, etwa über eine der genannten Hubbewegungen, wobei üblicherweise das Mischwerkzeug oberhalb des Mischbehälters stehen bleibt. Wenn nun der Behälter entnommen wird, können Farbreste an dem Mischwerkzeug entweder auf die Hand einer Bedienungsperson oder einen auf den Mischbehälter aufgebrachten Deckel tropfen, was zumindest lästig ist. Dann wird das Mischwerkzeug, an dem ja Reste des Mischguts haften bleiben, entfernt und beispielsweise in einen Abfallbehälter verbracht, wobei ebenfalls Farbtropfen die Umgebung verschmutzen können. Die entstehende Verschmutzung muß beseitigt werden und erfordert so Zeit und Kosten.The length of the mixing tool should be adapted to the dimensions of the mixing container. This is initially necessary solely because the mixing tool has to protrude to the bottom of the mixing container so that a stripping effect also takes place there. This minimum length is therefore determined by the mixing tank height. It may be desirable in series trials, in particular, to seal the mixing containers with a lid after the mixing in order to store them for a certain time. For this purpose, the mixing tool and the mixing container have to be separated from one another, for example by means of one of the lifting movements mentioned, the mixing tool usually remaining above the mixing container. If the container is now removed, paint residues on the mixing tool can drip either onto the hand of an operator or onto a lid attached to the mixing container, which is at least annoying. Then the mixing tool, to which residues of the material to be mixed stick, is removed and, for example, placed in a waste container, whereby drops of paint can also contaminate the surroundings. The resulting pollution must be removed and thus takes time and money.

Dies alles läßt sich vermeiden, wenn die Anpassung der Länge des Mischwerkzeugs in der Weise erfolgt, daß das Mischwerkzeug vollständig im Inneren des Mischbehälters aufnehmbar ist. Dann kann nämlich einfach das Mischwerkzeug in dem Mischbehälter verbleiben und muß so nicht extra entsorgt werden.All this can be avoided if the length of the mixing tool is adjusted in such a way that the mixing tool can be completely accommodated inside the mixing container. Then the mixing tool can simply remain in the mixing container and does not have to be disposed of separately.

Hierzu ist es förderlich, wenn das Mischwerkzeug gemäß einer weiteren vorteilhaften Ausgestaltung der Erfindung in einer Aufnahmevorrichtung rastbar aufnehmbar ausgebildet ist. Dann geht nämlich nicht nur das Einsetzen des Mischwerkzeugs schnell, sondern es kann auch durch eine geeignete Ausstoßvorrichtung, welche die Rastung überwindet, ein einfaches Ausstoßen des Mischwerkzeugs aus seiner Aufnahme erfolgen, wodurch das Mischwerkzeug einfach in den Mischbehälter fällt und so überhaupt nicht von Hand berührt werden muß, nachdem es mit Mischgut verunreinigt ist. Eine geeignete Rastvorrichtung kann etwa darin bestehen, daß der Schaft des Mischwerkzeugs eine radial umlaufende Rastnut aufweist, in die ein radial bewegbarer Rastdorn der Aufnahmevorrichtung eingreift. Der Rastdorn kann pneumatisch oder über einen Elektromagneten wieder aus der Nut gezogen werden und so das Werkzeug freigeben, das dann unter der Wirkung einer ebenfalls pneumatisch oder elektromagnetisch betätigten axial wirkenden Ausstoßvorrichtung in den Mischbehälter befördert wird.To this end, it is beneficial if the mixing tool is designed such that it can be latched in a receiving device in accordance with a further advantageous embodiment of the invention. Then not only is the insertion of the mixing tool fast, but it can also be easily ejected from the holder by a suitable ejection device which overcomes the catch, whereby the mixing tool simply falls into the mixing container and does not touch it at all by hand must be after it is contaminated with the mix. A suitable latching device can consist, for example, in that the shaft of the mixing tool has a radially circumferential latching groove, into which a radially movable latching mandrel of the receiving device engages. The locking pin can be pulled out of the groove pneumatically or via an electromagnet and thus release the tool, which is then conveyed into the mixing container under the action of a pneumatically or electromagnetically actuated ejection device.

Die letztgenannten Maßnahmen sind natürlich nur dann sinnvoll, wenn das Mischwerkzeug als Wegwerfartikel ausgebildet ist, also insbesondere nicht teuer ist. In diesem Zusammenhang ist es vorteilhaft, wenn das Mischwerkzeug einstückig ausgebildet ist, da sich dann die Herstellungskosten insbesondere für den Fall verringern, wenn das Mischwerkzeug gemäß einer weiteren vorteilhaften Ausgestaltung der Erfindung aus Kunststoff gefertigt ist. Einstückig aus Kunststoff im Spritzgußverfahren hergestellte Mischwerkzeuge sind so kostengünstig, daß sie als Wegwerfartikel angesehen werden können, wodurch sich die voranstehend geschilderten Erleichterungen beim Mischwerkzeugsaustausch erreichen lassen. Auch der Mischbehälter kann als Wegwerfartikel ausgestaltet sein und besteht dann vorzugsweise aus Kunststoff und kann so beispielsweise im Spritzgußverfahren hergestellt werden. Besonders für den Einsatz bei Farben und Lacken geeignete Kunststoffe für das Mischwerkzeug und den Mischbehälter sind Polyäthylen oder Polypropylen, insbesondere wegen der Lösungsmittelbeständigkeit dieser beiden Kunststoffe.The last-mentioned measures are, of course, only useful if the mixing tool is designed as a disposable item, that is, in particular, it is not expensive. In this context, it is advantageous if the mixing tool is formed in one piece, since the manufacturing costs then decrease, in particular if the mixing tool is made of plastic in accordance with a further advantageous embodiment of the invention. Mixing tools made in one piece from plastic by injection molding are so inexpensive that they can be regarded as disposable items, which makes it easier to replace the mixing tools as described above. The mixing container can also be designed as a disposable article and then preferably consists of plastic and can thus be produced, for example, by injection molding. The plastics for the mixing tool and the mixing container which are particularly suitable for use with paints and varnishes are polyethylene or polypropylene, in particular because of the solvent resistance of these two plastics.

Derartige Kunststoffbehälter werden üblicherweise in Stapeln von 100 Stück oder mehr geliefert. Nenn die Mischbehälter aus Kunststoff nur eine einfache, leicht konische Form aufweisen, so kann es geschehen, daß sie bei dieser stapelweisen Packung so fest aneinander haften, daß das Entfernen einzelner Behälter zumindest mühsam ist. In diesem Zusammenhang können die Rastvorsprünge am Mischbehälter zum Stapeln der Mischbehälter ausgebildet sein. Die Rastvorsprünge erfüllen also eine mehrfache Funktion, einmal wie eingangs bereits beschrieben zum Rasten der Mischbehälter an einer geeigneten Aufnahmevorrichtung zur drehstarren Kupplung und andererseits zum Stapeln der Mischbehälter.Such plastic containers are usually supplied in stacks of 100 or more. If the mixing containers made of plastic only have a simple, slightly conical shape, it can happen that they stick together so tightly in this stacked package that the removal of individual containers is at least tedious. In this context, the locking projections on the mixing container can be designed for stacking the mixing container. The latching projections therefore fulfill a multiple function, firstly as already described at the beginning for latching the mixing containers on a suitable holding device for the torsionally rigid coupling and secondly for stacking the mixing containers.

Die Erfindung wird nachstehend anhand zeichnerisch dargestellter Ausführungsbeispiele näher erläutert.The invention is explained in more detail below with the aid of exemplary embodiments shown in the drawings.

Es zeigen:

  • Figur 1: eine erste Ausführungsform einer Mischvorrichtung für einen Mischbehälter und ein Mischwerkzeug;
  • Figur 2: eine Aufsicht zur Erläuterung der Drehkreise von Mischbehälter und Mischwerkzeug;
  • Figur 3: eine Aufsicht auf eine Aufnahmevorrichtung für einen Mischbehälter mit Rastmitteln;
  • Figur 4: eine zweite Ausführungsform einer Mischvorrichtung mit drei Stationen für Mischbecher; und
  • Figur 5 und 6: vorteilhafte Ausführungsformen eines Mischwerkzeuges.
Show it:
  • Figure 1: a first embodiment of a mixing device for a mixing container and a mixing tool;
  • Figure 2 is a plan view to explain the turning circles of the mixing container and mixing tool;
  • Figure 3 is a plan view of a receiving device for a mixing container with locking means;
  • Figure 4: a second embodiment of a mixing device with three stations for mixing cups; and
  • Figures 5 and 6: advantageous embodiments of a mixing tool.

In Figur 1 ist eine Mischvorrichtung insgesamt mit der Bezugsziffer 10 bezeichnet. Ein Mischbecher 12 mit einer Becherwand 14 und einem Becherboden 16 ist in einem Haltering 18 aufgenommen, der über eine Stütze 20 auf einem Drehteller 22 festgelegt ist. Dieser Haltering kann, abgestimmt auf den Becher 12, Rastmittel aufweisen, die nachstehend im Zusammenhang mit Figur 3 näher erläutert sind. Es ist aber auch möglich, andere Maßnahmen zur Festlegung des Bechers 12 vorzusehen, beispielsweise durch eine entsprechende Ausgestaltung des Drehtellers 22. Auch zur Unterstützung der Festlegung des Bechers 12 auf dem Drehteller 22 können dort beispielsweise Saugöffnungen vorgesehen sein, in welchen ein durch eine nicht dargestellte Vorrichtung, beispielsweise eine Vakuumpumpe, Unterdruck erzeugt wird, wodurch der Becherboden 16 an dem Drehteller 22 durch Saugwirkung gehalten wird.In Figure 1, a mixing device is generally designated by the reference number 10. A mixing cup 12 with a cup wall 14 and a cup base 16 is received in a retaining ring 18 which is fixed on a turntable 22 via a support 20. This retaining ring can, depending on the cup 12, have latching means which are explained in more detail below in connection with FIG. 3. However, it is also possible to provide other measures for fixing the cup 12, for example by means of a corresponding design of the turntable 22. Also to support the fixation of the cup 12 on the turntable 22, suction openings can be provided there, for example, in which one is not shown Device, for example a vacuum pump, negative pressure is generated, whereby the cup base 16 is held on the turntable 22 by suction.

Der Drehteller 22 ist zentral mit einer Achse 24 eines Elektromotors 26 verbunden, der den Drehteller antreibt. Der Drehteller 22 und der Motor 26 sind seitlich und nach unten von einem Gehäuse 28 umgeben, welches sich seitlich in einem Tragarm 30 fortsetzt. Im Tragarm ist eine Paßbohrung vorgesehen, durch welche ein Ständer 32 ragt. Mittels einer nicht dargestellten Hubvorrichtung kann so die gesamte Anordnung mit Drehteller 22 und dem zugehörigen Gehäuse- und Antriebsbauteilen entlang dem Ständer 32 bewegt und festgelegt werden. Der Ständer 32 ist in seinem Fußabschnitt über eine Schweißung 38 auf einer stabilen Grundplatte 36 festgelegt.The turntable 22 is centrally connected to an axis 24 of an electric motor 26 which drives the turntable. The turntable 22 and the motor 26 are laterally and downwardly surrounded by a housing 28, which is continued laterally in a support arm 30. A fitting bore is provided in the support arm, through which a stand 32 projects. By means of a lifting device, not shown, the entire arrangement with the turntable 22 and the associated housing and drive components can be moved and fixed along the stand 32. The stand 32 is fixed in its foot section via a weld 38 on a stable base plate 36.

Am oberen Ende des Ständers 32 springt seitlich ein weiterer Tragarm 34 vor, in welchem eine Paßbohrung zur Aufnahme einer Achse 40 vorgesehen ist an deren anderem Ende ein Gehäuse 42 angeordnet ist. In Richtung des Pfeils 85 kann die Achse 40 gegenüber dem Tragarm 34 verschoben werden. Auch hierfür kann eine geeignete Hubvorrichtung vorgesehen sein, die nicht dargestellt ist, etwa wie bei der Höhenverstellung einer Säulenbohrmaschine.At the upper end of the stand 32, a further support arm 34 projects laterally, in which a fitting bore for receiving an axis 40 is provided, at the other end of which a housing 42 is arranged. In the direction of arrow 85, the axis 40 can be moved relative to the support arm 34. A suitable lifting device can also be provided for this, which is not shown, for example as in the height adjustment of a column drilling machine.

In dem Gehäuse 42 sind ein Elektromotor 44 und ein Winkelgetriebe 48 angeordnet, welche über eine Achse 46 miteinander verbunden sind. Abtriebsseitig am Winkelgetriebe 48 ist eine Aufnahme 50 für ein Mischwerkzeug 52 vorgesehen.An electric motor 44 and an angular gear 48 are arranged in the housing 42 and are connected to one another via an axis 46. On the output side of the angular gear 48, a receptacle 50 for a mixing tool 52 is provided.

Das Mischwerkzeug 52 ist als Flügelrührer ausgebildet und weist einen zentralen Schaft 54 auf, von welchem sich vier Rührflügel 56, 58, 60 und 62 erstrecken. Bei der Darstellung gemäß Figur 1 ragt hierbei der Flügel 58 aus der Papierebene heraus und der Flügel 62 in die Papierebene hinein.The mixing tool 52 is designed as a paddle stirrer and has a central shaft 54, from which four agitator blades 56, 58, 60 and 62 extend. In the illustration according to FIG. 1, the wing 58 protrudes from the plane of the paper and the wing 62 protrudes into the plane of the paper.

In der Aufnahmevorrichtung 50 kann eine Halte-und Ausstoßvorrichtung für das Mischwerkzeug 52 angeordnet sein, wie sie eingangs beschrieben wurde. Der Schaft 54 des Mischwerkzeuges 52 ist dann entsprechend ausgestaltet, beispielsweise mit einer radial umlaufenden Rastnut.A holding and ejecting device for the mixing tool 52 can be arranged in the receiving device 50, as was described at the beginning. The shaft 54 of the mixing tool 52 is then designed accordingly, for example with a radially circumferential locking groove.

Die gegenläufigen Drehrichtungen der Antriebsachse 24 für den Drehteller 22 und des Schafts 54 sind durch entsprechende Pfeile in Figur 1 angedeutet.The opposite directions of rotation of the drive shaft 24 for the turntable 22 and the shaft 54 are indicated by corresponding arrows in FIG. 1.

Die Drehrichtungen werden weiter durch Figur 2 verdeutlicht, wo eine Aufsicht auf den Becher 12 mit dem oberen Rand der Wandung 14 und dem Boden 16 dargestellt ist. Das Zentrum des Bechers wird von der Achse A, die auch in Figur 1 dargestellt ist, durchragt. Parallel hierzu verläuft die Achse B des Mischwerkzeugs 52. Aus Figur 2 wird deutlich, daß selbst bei feststehendem Flügelrührer 52 infolge der Drehbewegung des Bechers 12 eine Abstreifwirkung an den Innenwänden und am Boden, vergleiche Figur 1, des Bechers 12 erzielt wird. Die Abstreifwirkung wird jedoch in erheblichem Maße vergrößert, wenn auch der Flügelrührer 52 rotiert, wie es durch die entsprechenden Pfeile in Figur 1 und Figur 2 angedeutet ist.The directions of rotation are further illustrated by FIG. 2, where a top view of the cup 12 with the upper edge of the wall 14 and the bottom 16 is shown. The axis A, which is also shown in FIG. 1, extends through the center of the cup. The axis B of the mixing tool 52 runs parallel to this. From FIG. 2 it is clear that even when the paddle stirrer 52 is stationary, the rotary movement of the cup 12 results in a stripping effect on the inner walls and on the bottom, see FIG. 1 of the cup 12. However, the wiping effect is increased to a considerable extent if the paddle stirrer 52 also rotates, as indicated by the corresponding arrows in FIG. 1 and FIG. 2.

In Figur 3 ist ein Haltering 18 gemäß Figur 1 dargestellt, der mit drei Rastausnehmungen 70, 72 und 74 versehen ist, welche sich zum Ringinneren hin öffnen. In diese Ausnehmungen 70, 72 und 74 greifen entsprechend ausgebildete Rastvorsprünge 64, 66 und 68 ein, welche am Außenumfang der Becherwandung 14 angebracht sind. Einer dieser Rastvorsprünge (72) ist in der Schnittdarstellung des Bechers 12 in der linken Hälfte der Figur 1 dargestellt. Durch die gegenseitige Verrastung des Bechers 12 im Haltering 18 wird erreicht, daß der Becher 12 der Drehbewegung des Drehtellers 22 und des mit dem Drehteller 22 über die Stütze 20 verbundenen Halterings 18 ohne Schlupf folgt.FIG. 3 shows a retaining ring 18 according to FIG. 1, which is provided with three latching recesses 70, 72 and 74 which open towards the inside of the ring. Correspondingly designed locking projections 64, 66 and 68 engage in these recesses 70, 72 and 74 and are attached to the outer circumference of the cup wall 14. One of these locking projections (72) is shown in the sectional view of the cup 12 in the left half of FIG. 1. The mutual locking of the cup 12 in the holding ring 18 ensures that the cup 12 follows the rotary movement of the turntable 22 and the holding ring 18 connected to the turntable 22 via the support 20 without slippage.

In Figur 4 ist eine Mischungsvorrichtung in Aufsicht dargestellt, bei der drei Behälterstationen 22A, 22B und 22C vorgesehen sind. Diese Behälterstationen 22A, 22B und 22C entsprechen jeweils einem Drehteller 22 gemäß Figur 1. Ansonsten ist die in Figur 4 dargestellte Mischvorrichtung baugleich mit der in Figur 1 dargestellten Vorrichtung. Die Achse 40 ist drehbeweglich ausgeführt und gestattet so eine Verschwenkung des Gehäuses 42. In Figur 4 ist beispielsweise eine Verschwenkung des Gehäuses 42 mit der Aufnahmevorrichtung 50 für den Rührflügel von einer Becherstation 22C zu einer Becherstation 22B gezeigt, also in Richtung des Pfeiles 89. Die Mittelpunkte der drei Bear beitungsstationen 22A, 22B und 22C liegen hierbei auf einem Kreis um den Mittelpunkt der Achse 40, der einen Radius aufweist, der dem Abstand zwischen dem Mittelpunkt der Achse 40 und der Achse A in Figur 1 entspricht. Aus diesem Grunde ist der Drehkreis in Figur 4 mit A' bezeichnet.FIG. 4 shows a top view of a mixing device in which three container stations 22A, 22B and 22C are provided. These container stations 22A, 22B and 22C each correspond to a turntable 22 according to FIG. 1. Otherwise, the mixing device shown in FIG. 4 is identical in construction to the device shown in FIG. The axis 40 is designed to be rotatable and thus allows the housing 42 to be pivoted. FIG. 4 shows, for example, a pivoting of the housing 42 with the receiving device 50 for the impeller from a cup station 22C to a cup station 22B, that is to say in the direction of the arrow 89 Centers of the three machining stations 22A, 22B and 22C lie here on a circle around the center of the axis 40, which has a radius which corresponds to the distance between the center of the axis 40 and the axis A in FIG. 1. For this reason, the turning circle is designated A 'in FIG.

In den Figuren 5 und 6 sind besonders vorteilhafte Ausgestaltungen von Mischwerkzeugen gemäß der vorliegenden Erfindung dargestellt.5 and 6 show particularly advantageous configurations of mixing tools according to the present invention.

In Figur 5 ist ein Mischwerkzeug insgesamt mit der Bezugsziffer 120 bezeichnet. Das Mischwerkzeug 120 kann anstelle des in Figur 1 dargestellten Mischwerkzeugs 52 Verwendung finden. Im Einzelnen zeigt Figur 5a einen vertikalen Längsschnitt in einer ersten und Figur 5b einen entsprechenden vertikalen Längsschnitt in einer gegenüber Figur 5a um 90 Grad um die Zentralachse gedrehten Darstellung, Figur 5c ist eine Aufsicht auf das Mischwerkzeug 120. Das Mischwerkzeug 120 weist zwei längliche Schaftrippen 122, 124 auf, die sternförmig angeordnet sind, also um 90 Grad gegeneinander versetzt, was besonders deutlich aus Figur 5c hervorgeht. Die Schaftrippe 124 ist in ihrem oberen Abschnitt mit zwei randseitigen Ausnehmungen 126, 128 versehen und dementsprechend die Schaftrippe 122 mit zwei Ausnehmungen, von denen in den Darstellungen der Figuren 5a und 5b nur eine Ausnehmung 130 erkennbar ist. Diese Ausnehmungen 126,128 und 130 dienen als Rastausnehmungen zum Einrasten in entsprechend ausgebildete Rastvorsprünge der in Figur 1 dargestellten Aufnahmevorrichtung 50. Die beiden Schaftrippen 122, 124 des Mischwerkzeugs 120 bilden zusammen den Schaft des Mischwerkzeuges 120 aus und sind zur Erhöhung der Drehsteifigkeit weiterhin über Verstärkungsrippen 132 miteinander verbunden.In Figure 5, a mixing tool is generally designated by the reference number 120. The mixing tool 120 can be used instead of the mixing tool 52 shown in FIG. 1. In detail, FIG. 5a shows a vertical longitudinal section in a first and FIG. 5b a corresponding one vertical longitudinal section in a representation rotated by 90 degrees around the central axis in relation to FIG. 5a, FIG. 5c is a plan view of the mixing tool 120. The mixing tool 120 has two elongated shaft ribs 122, 124 which are arranged in a star shape, that is to say offset from one another by 90 degrees, which is particularly clear from Figure 5c. The upper section of the shaft rib 124 is provided with two recesses 126, 128 on the edge, and accordingly the shaft rib 122 is provided with two recesses, of which only one recess 130 can be seen in the illustrations in FIGS. 5a and 5b. These recesses 126, 128 and 130 serve as latching recesses for latching into correspondingly designed latching projections of the receiving device 50 shown in FIG. 1. The two shaft ribs 122, 124 of the mixing tool 120 together form the shaft of the mixing tool 120 and are furthermore interconnected via reinforcing ribs 132 to increase the torsional rigidity connected.

Das Mischwerkzeug 120 weist vier Rührflügel 134, 136, 138 und 140 auf, von denen zwei Rührflügel (134, 136) an der einen Seite der Schaftrippe 124 nach außen ragend angebracht sind und die beiden anderen Rührflügel (138, 140) am gegenüberliegenden Rand der Schaftrippe 124. An der anderen Schaftrippe 122 sind keine Rührflügel vorgesehen.The mixing tool 120 has four agitator blades 134, 136, 138 and 140, of which two agitator blades (134, 136) on one side of the shaft rib 124 project outwards and the other two agitator blades (138, 140) on the opposite edge of the Shaft rib 124. No stirring blades are provided on the other shaft rib 122.

Jeder der Rührflügel 134 bis 140 weist einen relativ starren Innenabschnitt und einen sich hieran nach außen anschließenden relativ flexiblen Außenabschnitt auf. Hierdurch wird erreicht, daß die Rührflügel 134 bis 140 insgesamt relativ biegesteif sind und daher eine gute Rührwirkung entfalten, sich aufgrund der flexiblen Außenabschnitte aber dennoch sehr gut an die Innenwandung eines Behälters anschmiegen.Each of the agitator blades 134 to 140 has a relatively rigid inner section and a relatively flexible outer section adjoining it outward. This ensures that the agitator blades 134 to 140 as a whole are relatively rigid and therefore develop a good stirring effect, but nevertheless nestle very well against the inner wall of a container due to the flexible outer sections.

Im einzelnen ist der Rührflügel 134 mit einem Innenabschnitt 134a und einem relativ kurzen, sich radial hieran anschließenden Außenabschnitt 134b versehen. Der Innenabschnitt 134a und der Außenabschnitt 134b sind einstückig zur Ausbildung eines Rührflügels 134 ausgebildet und dieser Rührflügel 134 ist wiederum einstückig mit der Schaftrippe 124 sowie insgesamt dem Mischwerkzeug 120 ausgebildet. Im Querschnitt ist der Außenabschnitt 134b erheblich gegenüber dem starreren Innenabschnitt 134a verjüngt.Specifically, the impeller 134 is provided with an inner section 134a and a relatively short outer section 134b, which adjoins it radially. The inner section 134a and the outer section 134b are formed in one piece to form a stirring blade 134 and this stirring blade 134 is in turn formed in one piece with the shaft rib 124 and the mixing tool 120 as a whole. In cross section, the outer section 134b is significantly tapered with respect to the more rigid inner section 134a.

In entsprechender Weise weist der Rührflügel 136 einen Innenabschnitt 136a und einen Außenabschnitt 136b auf; der Rührflügel 138 ist mit einem Innenabschnitt 138a und einem Außenabschnitt 138b versehen und ebenso der Rührflügel 140 mit einem Innenabschnitt 140a und einem Außenabschnitt 140b.In a corresponding manner, the impeller 136 has an inner section 136a and an outer section 136b; the impeller 138 is provided with an inner portion 138a and an outer portion 138b, and likewise the impeller 140 with an inner portion 140a and an outer portion 140b.

Weiterhin wird aus Figur 5 die versetzte Anordnung der Rührflügel deutlich, und zwar sind die Rührflügel derart an der Schaftrippe 124 angebracht, daß auf der einen Seite der unterere Rührflügel 140 angeordnet ist, oberhalb dessen und von diesem beabstandet sich der obere Rührflügel 138 befindet. Auf der gegenüberliegenden Seite ist, den Abstand zwischen den Rührflügeln 140 und 138 überdeckend, der Rührflügel 136 angebracht und oberhalb des Rührflügels 136, wiederum im Abstand gehalten, der Rührflügel 134. Bei einer Drehung des Mischwerkzeugs 120 um die Zentralachse überstreichen die vier Rührflügel 134 bis 140 daher den gesamten Bereich der Innenwand eines Mischbechers, ohne daß zwischen ihnen ein freier Raum verbleibt.Furthermore, the offset arrangement of the agitator blades is clear from FIG. 5, namely the agitator blades are attached to the shaft rib 124 in such a way that the lower agitator blade 140 is arranged on one side, above and at a distance from which the upper agitator blade 138 is located. On the opposite side, covering the distance between the agitator blades 140 and 138, the agitator blade 136 is attached and, above the agitator blade 136, again kept at a distance, the agitator blade 134. When the mixing tool 120 is rotated about the central axis, the four agitator blades 134 sweep over 140 therefore the entire area of the inner wall of a mixing bowl without leaving a free space between them.

Wie aus Figur 5b erkennbar ist, sind die Rührflügel nicht vertikal ausgerichtet, sondern schräg angebracht, wie dies anhand der beiden Rührflügel 138, 140 gezeigt ist; auf diese Weise wird bei einer Drehung des Mischwerkzeugs 120 um die Zentralachse auch noch eine auf- oder abwärts gerichtete Bewegung des Mischguts hervorgerufen. Die Schrägstellung der Rührflügel wird weiterhin deutlich aus der Aufsicht auf das Mischwerkzeug 120 gemäß Figur 5c, in welcher die beiden obersten, schräggestellten Rührflügel 134, 138 erkennbar sind.As can be seen from FIG. 5b, the impellers are not aligned vertically, but rather are attached obliquely, as is shown with the aid of the two impellers 138, 140; in this way, when the mixing tool 120 is rotated about the central axis, an upward or downward movement of the mixed material is also brought about. The inclination of the agitator blades is further evident from the view of the mixing tool 120 according to FIG. 5c, in which the two uppermost, inclined agitator blades 134, 138 can be seen.

Eine weitere vorteilhafte Ausführungsform eines Mischwerkzeugs 150 ist in Figur 6 dargestellt, und zwar wiederum in einem vertikalen Längsschnitt (Figur 6a), einem demgegenüber um 90 Grad gedrehten vertikalen Längsschnitt (Figur 6b) und in einer Aufsicht (Figur 6c). Den Schaft des Mischwerkzeugs 150 bildet ein sich von oben nach unten verjüngender Hohlzylinder 152. An diesem Hohlzylinder 152 sind Rührflügel 154, 156, 158 und 160 einstückig angeordnet, die ansonsten den im Zusammenhang mit Figur 5 voranstehend besprochenen Rührflügeln 134 bis 140 gleichen; insbesondere sind auch die Rührflügel 154 bis 160 mit Innen- und dünneren, flexibleren Außenabschnitten versehen. Am oberen Ende weist der Hohlzylinder 152 einen V-förmigen Ausschnitt 162 auf, an dessen Spitze eine kreisförmige Rastausnehmung 164 ausgebildet ist. In diese Rastausnehmung 164 kann beispielsweise eine Querachse einer Aufnahmevorrichtung 50 (Figur 1) einschnappen.A further advantageous embodiment of a mixing tool 150 is shown in FIG. 6, again in a vertical longitudinal section (FIG. 6a), in contrast a vertical longitudinal section rotated by 90 degrees (FIG. 6b) and in a top view (FIG. 6c). The shaft of the mixing tool 150 is formed by a hollow cylinder 152 which tapers from top to bottom. On this hollow cylinder 152, agitator blades 154, 156, 158 and 160 are arranged in one piece, which otherwise are the same as the agitator blades 134 to 140 discussed above in connection with FIG. 5; in particular, the agitator blades 154 to 160 are provided with inner and thinner, more flexible outer sections. At the upper end, the hollow cylinder 152 has a V-shaped cutout 162, at the tip of which a circular latching recess 164 is formed. For example, a transverse axis of a receiving device 50 (FIG. 1) can snap into this latching recess 164.

Ein Hohlzylinder 152 weist, ebenso wie ein mit Schaftrippen versehenes Mischwerkzeug 120, bei einer einstückigen Ausführung aus einem geeigneten Kunststoff bereits eine relativ hohe Biegesteifigkeit auf. Die Biegesteifigkeit läßt sich darüber hinaus noch erheblich erhöhen, wenn der Hohlzylinder 152 über einen korrespondierenden Dorn der Aufnahmeeinrichtung 50 gestülpt wird. Der Dorn kann auch noch mit einer Auswurfvorrichtung versehen werden. Dazu ist der Dorn vorzugsweise als Hohlwelle gestaltet, durch die eine Führungsachse konzentrisch hindurchragt. Ist dann der Hohlzylinder 152 durch eine Rastung in der Rastausnehmung 164 festgelegt, so genügt eine Betätigung der Führungsachse nach unten (mechanisch, pneumatisch, elektrisch), um das gesamte Mischwerkzeug 150 zu entrasten und von der Aufnahmevorrichtung 50 zu lösen.A hollow cylinder 152, like a mixing tool 120 provided with shaft ribs, already has a relatively high bending stiffness in a one-piece design made of a suitable plastic. The bending stiffness can also be increased considerably if the hollow cylinder 152 is placed over a corresponding mandrel of the receiving device 50. The mandrel can also be provided with an ejection device. For this purpose, the mandrel is preferably designed as a hollow shaft through which a guide axis projects concentrically. If the hollow cylinder 152 is then fixed by a detent in the detent recess 164, actuation of the guide axis downward (mechanical, pneumatic, electrical) is sufficient to detach the entire mixing tool 150 and to detach it from the holding device 50.

Eine weitere vorteilhafte Ausführungsform der erfindungsgemäßen Mischvorrichtung geht aus dem oberen linken Teil der Figur 1 hervor. Elektrische Verbindungsleitungen 100, 102 des elektrischen Antriebsmotors 44 sind über ein Amperemeter 104 zu Anschlußklemmen 110, 112 geführt, an welche eine Versorgungsspannung U für den Elektromotor 44 angelegt wird. Wird der Elektromotor 44 in Betrieb gesetzt, so ist ein bestimmter Versorgungsstrom erforderlich, um das Mischwerkzeug 52 (oder 120 oder 150) zu drehen, abhängig beispielsweise von den Übertragungsverlusten im Getriebe 48 und von dem Reibungswiderstand der Rührflügel in dem Becher 12. Wird nun Mischgut in den Becher 12 eingegeben, so ist zu dessen Bewegung zusätzliche Leistung erforderlich, die sich in einer erhöhten Stromaufnahme des Motors 44 bemerkbar macht und durch einen erhöhten Strom anhand des Amperemeters festgestellt werden kann. Von einer ersten Stellung eines Zeigers 108 auf einer Skala 106 des Amperemeters bewegt sich daher der Zeiger 108 weiter. Diese zusätzliche Stromaufnahme ist daher ein Maß für die Viskosität des Mischguts. Hierdurch läßt sich auf einfache Weise die Viskosität des Mischguts, gegebenenfalls nach einer vorherigen Eichung, feststellen. Weiterhin ist es möglich, durch eine derartige Überwachung der Viskosität eine weitere Vereinheitlichung des Mischvorgangs, insbesondere bei größeren Mischserien, vorzunehmen. Beispielsweise kann, beim Mischen zweier Mischgüter unterschiedlicher Viskosität, die Mischung solange durchgeführt werden, bis sich die Viskosität der resultierenden Mischung nicht mehr wesentlich ändert.A further advantageous embodiment of the mixing device according to the invention can be seen from the upper left part of FIG. 1. Electrical connecting lines 100, 102 of the electric drive motor 44 are led via an ammeter 104 to connecting terminals 110, 112, to which a supply voltage U for the electric motor 44 is applied. If the electric motor 44 is put into operation, then a certain Ver Supply current required to rotate the mixing tool 52 (or 120 or 150), depending, for example, on the transmission losses in the gear 48 and on the frictional resistance of the impellers in the cup 12. If material to be mixed is now entered into the cup 12, additional movement is required to move it Power required, which is reflected in an increased current consumption of the motor 44 and can be determined by an increased current using the ammeter. The pointer 108 therefore moves on from a first position of a pointer 108 on a scale 106 of the ammeter. This additional current consumption is therefore a measure of the viscosity of the mix. This makes it easy to determine the viscosity of the mix, if necessary after prior calibration. Furthermore, by monitoring the viscosity in this way, it is possible to further standardize the mixing process, in particular in the case of larger mixing series. For example, when mixing two mixes of different viscosity, the mixing can be carried out until the viscosity of the resulting mixture no longer changes significantly.

Claims (14)

1. Mixing device with
1.1 at least one mixing vessel (12),
1.1.1 being detachably secured on a receiving means (18, 20), but
1.1.2 twist safe by locking means (64, 66, 68) between mixing vessel (12) and receiving means (18, 20) and
1.2 a rotatable mixing tool (52, 120, 150), with
1.2.1 a central shaft (54, 122, 124, 152) and
1.2.2 elastic stirring wings (56, 58, 60, 62, 134, 136, 138, 140) protruding from said shaft and arranged in spaced relationship,
1.2.3 each comprising an inner section (134a, 136a, 138a, 140a) adjacent to said shaft (122, 124) and an annexed outer section (134b, 136b, 138b, 140b) being substantially more flexible than said inner section (134a, 136a, 138a, 140a), wherein 1.3 said mixing tool (52, 120, 150) or its stirring wings (52, 58, 60, 62, 134, 136, 138, 140) respectively are shaped at least partially transverse to said relative motion of said mixing tool (52, 120, 150) with respect to said mixing vessel (12) and arranged in such a way as to contact the inner wall of the mixing vessel (12) while rotating.
2. Mixing device according to claim 1, wherein said mixing tool (52, 120, 150) may be guided in a circular motion while grazing the inner wall of the mixing vessel (12).
3. Mixing device according to claim 1 or 2, wherein the mixing vessel (12) is arranged in a rotatable manner.
4. Mixing device according to one of claims 1 to 3, wherein recesses (70, 72, 74) are provided in said receiving means (18) and wherein locking protruding means (64, 66, 68) of a shape corresponding to said recesses are provided at said mixing vessel (12).
5. Mixing device according to claim 3 or 4, wherein said mixing vessel (12) is shaped rotationally symmetric and rotatable around an axis (A) and said mixing tool (52), the length of which is preferably adapted to the height of the mixing vessel (12) is arranged along an axis (B), which runs in parallel distant relationship to said axis (A).
6. Mixing device according to one of claims 1 to 5, wherein said mixing tool (52) has, at least partially, a spiral shape.
7. Mixing device according to claim 5, wherein said mixing vessel (12) and/or said mixing tool (52) are movable in the direction of said axis (A) or said axis (B), respectively.
8. Mixing device according to one of claims 1 to 7, wherein said mixing tool (52) is lockingly receivable in a receiving means (50) and wherein said receiving means (50) comprises a ram for unlocking, upon actuation of the ram, said mixing tool (52, 120, 150) from said receiving means (50).
9. Mixing device according to claim 8, wherein said receiving means (50) comprises a hollow shaft, in which a ram is arranged which may be ejected downwardly.
10. Mixing device according to one of claims 1 to 9, wherein an electric motor (44) is provided for driving said mixing tool (52), and wherein the load on said motor is monitored by a current measuring means (104) for determining the viscosity of the mixing product and restristerable, if needed.
11. Mixing device according to one of claims 1 to 10, wherein said shaft of said mixing tool (120) comprises two longitudinal ribs (122, 124) arranged in transverse relationship.
12. Mixing device according to one of claims 1 to 10, wherein said shaft of said mixing tool (150) is shaped as a preferably conically tapered hollow cylinder (152).
13. Mixing device according to one of claims 1 to 12, wherein said mixing tool (52, 120, 150) and/or said mixing vessel (12) are made of a plastic material, preferably of polyethylene of polypropylene.
14. Use of a mixing device according to one of claims 1 to 13 for mixing paints and/or lacquers.
EP87103482A 1986-03-11 1987-03-11 Apparatus and tool for mixing and use thereof Expired EP0237042B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87103482T ATE45514T1 (en) 1986-03-11 1987-03-11 MIXING DEVICE AND MIXING TOOL AND USE THEREOF.

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE3608038 1986-03-11
DE3608038A DE3608038C1 (en) 1986-03-11 1986-03-11 Mixing device
DE8606658U DE8606658U1 (en) 1986-03-11 1986-03-11 Mixing device

Publications (2)

Publication Number Publication Date
EP0237042A1 EP0237042A1 (en) 1987-09-16
EP0237042B1 true EP0237042B1 (en) 1989-08-16

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP87103482A Expired EP0237042B1 (en) 1986-03-11 1987-03-11 Apparatus and tool for mixing and use thereof

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EP (1) EP0237042B1 (en)
DE (1) DE8606658U1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0785018A1 (en) * 1996-01-19 1997-07-23 Douglas P. Dickey Variable speed mixer

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE970311C (en) * 1948-10-02 1958-09-04 Ernst Reiffen Dipl Ing Mixing and grating machine for pasty or liquid goods
DE847423C (en) * 1950-07-13 1952-08-25 Johann Dosch Machine for mixing colors in retail sales
AT237828B (en) * 1962-02-02 1965-01-11 Bosch Gmbh Robert Kneading and stirring tools for kitchen machines
US4166705A (en) * 1978-04-20 1979-09-04 Fronske Handcraft Equipment Corporation Apparatus for mixing handcraft materials
CA1187481A (en) * 1980-06-04 1985-05-21 Robert Mercatoris Apparatus and method for the production of colloidal mixtures
GB2081115A (en) * 1980-06-24 1982-02-17 Thorn Domestic Appliances Ltd A whisk for a domestic food mixer or processor
US4350445A (en) * 1980-12-15 1982-09-21 Olsson Sven O Paddle

Also Published As

Publication number Publication date
DE8606658U1 (en) 1987-01-08
EP0237042A1 (en) 1987-09-16

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