DE2534418C2

DE2534418C2 - Mixing tool

Info

Publication number: DE2534418C2
Application number: DE19752534418
Authority: DE
Inventors: Stefan Dr.-Ing 3501 Vellmar Schulz
Original assignee: Thyssen Industrie AG
Current assignee: ThyssenKrupp Technologies AG
Filing date: 1975-08-01
Publication date: 1977-07-21

Description

versetzt wieder zusammengefügten Trennkanten A und B verläuft etwa parallel zur Drehachse 3 des Mischwerk^euges la. The separating edges A and B , which are staggered back together, run approximately parallel to the axis of rotation 3 of the mixer ^ euges la.

Die Nabe 4 ist mit drei urn jeweils 120° versetzt angeordneten Armen 5, 6, 7 an der in sich gewölbten Werkzeugfläche befestigt. Die Länge der in den Winkelstellungen der 360°-Teilung 5a und 6a angebrachten Arme 5 und 6 einspricht der Länge der Arme, die vom ursprünglichen Kreisring zu einer zentralen Nabe 4a verlaufen würden, wie in F i g. 2 angedeutet.The hub 4 is offset by three by 120 ° each arranged arms 5, 6, 7 attached to the curved tool surface. The length of the Angular positions of the 360 ° division 5a and 6a attached arms 5 and 6 corresponds to the length of the arms, which would run from the original circular ring to a central hub 4a, as in FIG. 2 indicated.

In F i g. 1 ist das in sich gewölbte fertige Mischwerkzeug in Draufsicht dargestellt.In Fig. 1 shows the curved finished mixing tool in plan view.

In Fig.3 isi das Mischwerkzeug perspektivisch dargestellt in seiner bodenseitigen Einbaulage im angedeuteten Mischbehälter 9.The mixing tool is shown in perspective in FIG shown in its bottom-side installation position in the indicated mixing container 9.

Zur Kennzeichnung der bevorzugten Drehrichtung ist der im Uhrzeigersinn gerichtete Pfeil C eingezeichnet. The clockwise arrow C is shown to identify the preferred direction of rotation.

Die vorstehend beschriebene Trennung des Kreisringes 1 und das beschriebene Zl ■'■ menfügen der Trennkanten A und B in ei.ier u». 180° versetzten Stellung ergibt eine einzige in sich geschlossene Werkzeugfläche, die je ',cdi Lage innerhalb der angegebenen 360"-TeUUr^ i-nterschiedüche Wirkungen auf das Mischgut ausübt. Der überwiegend waagerechtThe above-described separation of the circular ring 1 and the described joining of the separating edges A and B in egg. A 180 ° offset position results in a single, self-contained tool surface which, depending on its position within the specified 360 "range, has different effects on the material to be mixed. The predominantly horizontal

verlaufende Teil im Bereich von 270° über 360°/0° bis 90° wirft wie jedes scheibenförmige Werkzeug Mischgut radial nach außen. Der sich im Bereich von 90° bis iöü aus der waagerechten Ebene in senkrechte Stellung aufwölbende von oben sichtbare Werkzeugflächenteil schneidet sich mit seiner Außenkante la in das Mischgut, d. h. in die Unterseite des umlaufenden Mischgutringes ein und saug* Mischgut nach unten und innen. Mit dem im Bereich von 180° bis etwa 270° von eben sichtbaren Werkzeugflächenteil, der aus senkrechter Stellung wieder in waagerechte Lage übergeht und zugleich von 180° bis 270° sich vergrößernde Abstände b\, bi, O₃ zur Nabe 4 aufweist, wird das Mischgut vorwiegend nach oben gefördert. Die bezogen auf die senkrechte Mischwerkzeugdrehachse 3 unsymmetrische Gestaltung des erfindungsgemäßen Mischwerkzeuges ergibt bei Werkzeugumfangsgeschwindigkeiten bis zu 50 m/sec. einen sehr ausgeprägten trombenförmigen Mischgutumlauf. Dabei werden den Mischgutpartikeln durch die gewölbten Teile der Werkzeugfläche in rascher Folge zusätzliche auf- und abwärts gerichtete Impulse erteilt, durch die eine zusätzliche Durchmischung des umlaufenden Mischgutringes in vertikaler Richtung bewirkt wird.A part running in the range from 270 ° over 360 ° / 0 ° to 90 ° throws mixed material radially outwards like any disc-shaped tool. The part of the tool surface that is visible from above and bulges from the horizontal plane into a vertical position in the range from 90 ° to iöü cuts with its outer edge la into the material to be mixed, ie into the underside of the surrounding material ring and sucks the material downwards and inwards. With the tool surface part that is visible in the range from 180 ° to about 270 °, which changes from a vertical position back to a horizontal position and at the same time has increasing distances b \, bi, O _{3 to the hub 4 from 180 ° to 270 °} Mix mainly conveyed upwards. The design of the mixing tool according to the invention, which is asymmetrical with respect to the vertical mixing tool axis of rotation 3, results in tool peripheral speeds of up to 50 m / sec. a very pronounced bowl-shaped mix circulation. The curved parts of the tool surface give the mix particles in quick succession additional upward and downward impulses, which cause additional mixing of the rotating mix in the vertical direction.

Hierzu 3 Blatt ZeichnungenFor this purpose 3 sheets of drawings

Claims

Claim:

Mixing tool with tool surfaces attached to a hub for installation in the bottom The tool surface is formed from an originally flat circular ring (1) with a small wall thickness, the original outer ring diameter (Di) of which is a small amount smaller than the inner diameter of the container (ΐθ) and the original inner diameter of the ring (D2) is around 50 to 70% of the original outer diameter of the ring and which is separated at one point in the radial direction and reassembled under the arching of the circular ring with separating edges (A and B) offset by 180 ° and fastened with several arms to the hub (4) located in the center of the originally flat circular ring (1), being the Nah t (2) runs almost parallel to the vertical tool axis (3) ^{between the separating edges Λ} and B) , which are again offset by 18C °.

The invention relates to a mixing tool with tool surfaces attached to a hub towards the bottom Installation in mixers for powdery, granular or liquid mixing gui with upright cylindrical container and bowl-shaped mix in the case of Werk-eugur, "anging speeds up to to 50 m / oec up to close to the inner wall of the tank reaching tool ends.

Known mixing tools for mixers of this type consist of wing-like arms reaching from the hub to close to the inner wall of the container, which are arranged near the bottom of the container and which, largely from the cross-section of the arms at peripheral tool speeds of up to 50 rn / sec, move the material to be mixed in a bowl-shaped circuit bring. The material to be mixed is thrown radially from the outside of the container wall by the ι liierenden tool located near the container bottom, rises there in a spiral movement and then falls or flows back to the center of the container, in order to then circulate again from the bottom tool to be accelerated. Within the entianggieitenden on the container inner wall Mlschgutringes have the adjacent Mischgutpartikeln respective different speeds, but there is the danger that in the annular core areas of Mischsutringes the speed difference of adjacent Mischgutpartikeln is very Kia rich and thus there remains a part of the Mischgutpartikein longer. In order to avoid such a low-motion zone, which has a disadvantageous effect on the quality of mixing, use oh several at intervals one above the other arranged at the same speed rotating tools. However, the installation of additional tools makes the mixer more expensive, since both the material costs for the stainless tool steels used and the costs for polishing the tool surface are high. .

Hence Heg. the invention is based on the object To create n mixing tools for installation in mixers of the type mentioned above, with which the Formation of a low-movement zone in the ring-shaped core area of the mix ring in the case of turbo-like Mixture circulation is avoided and tool costs are reduced compared to multi-storey tools will.

According to the invention, this object is achieved in that the tool surface consists of an originally flat one Circular ring of small wall thickness is formed, the original ring outer diameter by a small Amount smaller than the inner diameter of the container and its original inner diameter of the ring, for example 50 to 70% of the original ring outer diameter and that at one point in the radial direction separated and reassembled under the arching of the circular ring with separating edges offset by 180 ° and with several arms on the hub located in the center of the originally flat circular ring is attached, the seam between the treads, which are offset by 180 °, almost edges runs parallel to the vertical tool axis of rotation.

The advantage achieved by the invention is that the formation of a dead zone in the annular Core area of the mix ring circulating in the mixing container solely due to the special design of the single-faced mixing tool is avoided.

An exemplary embodiment de / invention is shown in the drawing and will be described in more detail below described. It shows

F i g. 1 shows a plan view of a mixing tool with a single curved tool surface

F i g. 2 shows a plan view of a flat circular ring after the transformation into the form of the Mischwerka.eugs Fig. 1

3 shows a perspective view of the tool according to FIG. 1..

The planar circular ring 1 shown in plan view in FIG. 2 has a ring outer diameter Di which is a small amount smaller than the inner diameter 10 of the mixing container 9 for which the mixing tool to be made from this circular ring is intended. The inner diameter of the ring D 2 is about 50 to 70% of the outer diameter of the ring D 1. On the circular ring 1, graduation marks of a 360 ° division are affixed at 10 ° intervals, their 0 ° or 360 ° position on the right on the horizontal axis »a « Lie. The division is applied from the 0 ° point with radial lines in a counter-clockwise direction. These tick marks are not part of the finished mixing tool, but serve to clarify the following explanations. In the embodiment according to FIG. 2, the circular ring 1 made of stainless steel sheet is separated in the radial direction at the ISC part of the 360 ° division on the left in the picture. The opposing separating edges are labeled A and B. While the circular ring 1 is now open at the same time, the separating edge A at the top in the picture is rotated by 180 ° and re-joined with the separating edge 5 to coincide there, e.g. by welding the on the original graduation at .PO de <■ 360 ° division located seam 2 between the mii