EP2769763B1 - Mischwerkzeug - Google Patents

Mischwerkzeug Download PDF

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Publication number
EP2769763B1
EP2769763B1 EP14153246.5A EP14153246A EP2769763B1 EP 2769763 B1 EP2769763 B1 EP 2769763B1 EP 14153246 A EP14153246 A EP 14153246A EP 2769763 B1 EP2769763 B1 EP 2769763B1
Authority
EP
European Patent Office
Prior art keywords
mixing
mixing member
rotation
opening
tool
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.)
Not-in-force
Application number
EP14153246.5A
Other languages
English (en)
French (fr)
Other versions
EP2769763A3 (de
EP2769763A2 (de
Inventor
Jens-Uwe Dipl.-Ing Schultz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Gebrueder Loedige Maschinenbau GmbH
Original Assignee
Lodige Maschb Ges Geb mbH
Gebrueder Loedige Maschinenbau GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Family has litigation
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Application filed by Lodige Maschb Ges Geb mbH, Gebrueder Loedige Maschinenbau GmbH filed Critical Lodige Maschb Ges Geb mbH
Publication of EP2769763A2 publication Critical patent/EP2769763A2/de
Publication of EP2769763A3 publication Critical patent/EP2769763A3/de
Application granted granted Critical
Publication of EP2769763B1 publication Critical patent/EP2769763B1/de
Not-in-force legal-status Critical Current
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/05—Stirrers
    • B01F27/07—Stirrers characterised by their mounting on the shaft
    • B01F27/072—Stirrers characterised by their mounting on the shaft characterised by the disposition of the stirrers with respect to the rotating axis
    • B01F27/0726—Stirrers characterised by their mounting on the shaft characterised by the disposition of the stirrers with respect to the rotating axis having stirring elements connected to the stirrer shaft each by a single radial rod, other than open frameworks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/05—Stirrers
    • B01F27/11—Stirrers characterised by the configuration of the stirrers
    • B01F27/112—Stirrers characterised by the configuration of the stirrers with arms, paddles, vanes or blades
    • B01F27/1123—Stirrers characterised by the configuration of the stirrers with arms, paddles, vanes or blades sickle-shaped, i.e. curved in at least one direction
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/05—Stirrers
    • B01F27/11—Stirrers characterised by the configuration of the stirrers
    • B01F27/112—Stirrers characterised by the configuration of the stirrers with arms, paddles, vanes or blades
    • B01F27/1125—Stirrers characterised by the configuration of the stirrers with arms, paddles, vanes or blades with vanes or blades extending parallel or oblique to the stirrer axis
    • B01F27/11251—Stirrers characterised by the configuration of the stirrers with arms, paddles, vanes or blades with vanes or blades extending parallel or oblique to the stirrer axis having holes in the surface

Definitions

  • the invention relates to a mixing tool according to the preamble of claim 1.
  • the mixing tool concerned is suitable for mixing solids, solid-liquids or also liquids.
  • the mixing of solids, such as bulk materials, results in particularly high requirements as regards the mixing tool.
  • the high mechanical resistances cause correspondingly high breakaway torques for starting the mixing process, so that a high power consumption on the drive of the mixer is the result. Accordingly, an efficient operation of the mixer is not possible.
  • Mixing tools designed like ploughshare blades are known. They comprise a mixing tool for mixers with a, for example, drum-shaped mixing container, in which the mixing tool revolves with its edges spaced a short distance from the mixing container wall. Lifting ribs that enable a high specific mixing effect are provided at the rear end of the mixing tool by means of cutouts in the upper region of the lateral surfaces.
  • the ploughshare-like mixing tool is not satisfactory with regard to energy efficiency
  • DE 3901894 A1 discloses a mixing tool according to the preamble of claim 1.
  • a shearing/mixing tool is known from DE 10 2009 01817 A1 , which comprises a shearing/throwing blade, an arm and a preferably triangular opening interposed therebetween.
  • the opening serves for the improved fluidization in the drying phase and, if necessary, a better thorough mixing of the components during the mixing process.
  • the shearing/mixing tool is primarily designed to achieve, in addition to a mixing effect, a restructuring of the material in the mixing material.
  • the arm is straight, bent and/or slanted in order to promote the shearing action of the shearing/mixing tool.
  • the invention is based on the object of improving and further developing the known mixing tool, particularly with regard to the energy efficiency during mixing.
  • Flow means the quantity of substance passing through the opening of the mixing member, wherein substances in gaseous, liquid and/or solid states of aggregation can, in principle, be used as starting materials for the mixing material.
  • the proposed solution is advantageous in that a considerably lower resistance, particularly when starting the mixing process, is obtained by means of the mixing member with the opening. Consequently, the breakaway torque is reduced.
  • the weight reduction in the mixing tool which is additionally achieved by means of the opening in the mixing member, and the moment of inertia altered thereby also has an effect on the general mixing operation.
  • the power consumption of the drive means during mixing can be reduced, so that the overall energy requirements are reduced, irrespective of the filling level of the mixing container.
  • it was found that the mixing effect and achievable mixing quality is maintained, so that a good specific mixing performance is made possible in an efficient manner. Seen over the entire operating time, large energy savings can thus be accomplished,
  • the opening of the mixing member is configured in an arc-shape or circular-arc shape at least in some regions, preferably on the side of the mixing member facing away from the supporting arm.
  • an optimum adaptation of the mixing member to the mixing container thus becomes possible.
  • product depositions or caking of the mixing material to the walls of the mixing container can be prevented in an improved manner.
  • the mixing member comprises an arc-shaped section, at least one lateral rib and one central rib. In this way, a particularly rugged and load-adapted configuration of the mixing member, particularly for mixing solids, can be obtained.
  • an inflow side on the mixing member has a larger cross section than an outflow side.
  • the opening of the mixing member is configured to taper in an opposite direction to the direction of rotation.
  • the mixing member is preferably equipped with slanted inner faces, for example on the arc-shaped section, on the lateral rib and/or the central rib.
  • the cross section of the inflow side which is larger in comparison with the outflow side, provides for a converging flow of the mixing material on the mixing member. If a substance to be mixed gets into the opening of the mixing member, a converging flow is generated by the rotation of the mixing tool in the direction of rotation.
  • the converging flow can be adjusted in a specific manner by means of the slanted inner faces on the mixing member.
  • the substances of the mixing material e.g. particles of a bulk material, are then reflected or deflected correspondingly on the inner faces of the mixing member.
  • the reflection of the mixing material on the inner faces causes a reduced influence of the opening on the overall mixing effect, just as if it was not present.
  • the mixing effect can be adjusted in a specific manner depending on the rotation of the mixing tool. It is advantageous, in particular, that the breakaway torque during the start as well as the power consumption during the mixing process are reduced by the proposed mixing tool.
  • the mixing member, the mixing tool and the drive means are subjected to lower torques and can be dimensioned accordingly.
  • the mixing tool can be manufactured with a reduced material thickness. Excess capacities and reactive current components can also be reduced in the case of drive means, such as electric motors.
  • the distance between the inflow side and the outflow side of the mixing member is at least 20 mm, more preferably at least 40 mm. Such a distance thus improves the conveying characteristics for a converging flow on the mixing member. Given a correspondingly fast rotation of the mixing tool, the specific mixing performance is improved at the same time.
  • the mixing member can expediently also be configured in a substantially shovel-shaped manner, with the opening in that case forming a cutout on the inside of the shovel shape.
  • the height of the mixing member, seen from the front is smaller than the width of the mixing member, preferably by at least 30 %, more preferably by at least 50 %.
  • the resistance during the mixing process can thus be optimized even further.
  • the mixing member can also comprise on the inflow side a frontal edge which is preferably formed, seen in the direction of rotation, in the shape of a blade edge, in particular so as to taper to a point.
  • the mixing member seen from the side of the mixing tool, at an angle on the supporting arm.
  • the mixing member forms an angle of 10 ° to 50 °, more preferably of 20 ° to 40 ° to the supporting arm axis.
  • the slanted arrangement of the mixing member on the supporting arm enables defined conveying characteristics of the mixing material. Product depositions or caking of the mixing material to the walls of the mixing container can also be prevented in an improved manner with the protruding arc-shaped section of the mixing member.
  • the opening of the mixing member is oriented substantially perpendicular to the plane of rotation of the mixing tool.
  • the advantageous mixing characteristics of the mixing member can thus be realized particularly effectively when mixing in the direction of rotation.
  • the arrangement of the mixing tool in the mixing container is designed such that the mixing member ends at a short distance from the wall of the mixing container.
  • several mixing tools are attached to the drive shaft.
  • the individual mixing tools are disposed on the drive shafts in such a way that the individual mixing members of the mixing tools sweep over substantially the entire inner surface of the mixing container during a rotation of the drive shaft of 360 °, so that no volume regions of the mixing container are left out during the mixing process.
  • a homogeneous, uniform mixture can be obtained which, seen in the individual regions, has identical product properties
  • the proposed mixing tool can be applied in all conceivable areas, such as chemistry, pharmaceutical industry, food and building materials industry.
  • the proposed mixir tool is used for mixing solids, for example in the treatment of bulk materials wherein liquids may also be added in order to humidify the mixing materia
  • the mixing tool is used in conjunction with a horizontally or vertically oriented cylindrical mixing container in which a drive shaft is then correspondingly disposed in a concentric manner.
  • the size, number and arrangement of the proposed mixing tools on the drive shaft can then be expediently matched to the respective application in order to achieve a desired mixing effect.
  • the mixing tool 1 concerned is equipped, as shown in Figures 1 to 3 , with a supporting arm 7 for connection to the drive shaft as well as with a mixing member 4.
  • the mixing member 4 seen from the front, has an opening 2, which is configured in a circular-arc shape.
  • the mixing member 4 comprises an arc-shaped section 4c.
  • the mixing tool 1 can be disposed for example in a cylindrical mixing container in such a way that the distance between the mixing member 4 and the wall of the mixing container is as small as possible, in order thus to prevent product depositions or caking of the mixing material to the wall.
  • the mixing member 4 with the opening 2 attains a lower resistance in the mixing material, so that, in particular, the breakaway torque of the mixing tool 1 when starting is reduced. Smaller torques are also obtained during the mixing process itself, so that the power consumption on the drive means is reduced. The overall energy requirements can thus be reduced.
  • the mixing member 4 comprises, at each of the two sides of the arc-shaped section 4c, lateral ribs 5c that are connected via a central rib 6 attached to the supporting arm 7.
  • the supporting arm 7 is connected accordingly to the drive shaft of the mixer.
  • the attachment of the supporting arm 7 to the drive shaft can be realized in a detachable manner, or the supporting arm 7 can be welded to the drive shaft.
  • the inner faces 8 of the mixing member are preferably configured as slanted inner faces.
  • the lateral rib for example, has a slant 9a, seen in the circumferential direction 3.
  • the opening 2 of the mixing member 4 can be specifically adjusted to obtain a converging flow of the mixing material.
  • the details regarding the inner faces 8 and the configuration of the opening 2 are explained further below.
  • the height of the mixing member 11 is in this case configured to be smaller than the width of the mixing member 12.
  • the height of the mixing member 11 is smaller than the width of the mixing member by at least 30 %, more preferably by at least 50 %. Given this ratio of height to width of the mixing member 11, advantages can be obtained as regards the flow.
  • the mixing member 4 is in this case configured in a substantially shovel-shaped manner, with the opening 2 forming a cutout on the inside of the shovel shape.
  • the direction of the arrow 3 indicates the direction of rotation of the mixing tool 1 in the mixing container.
  • the result is an inflow side 13 on the mixing member 4, which serves for the entry of the mixing material into the opening 2, and an outflow side 14, from which the entered portion of the mixing material exits from the opening 2.
  • the inflow side 13 of the mixing member 4 has a larger cross section than the outflow side 14. Accordingly, the opening 2 of the mixing member 4 is configured in such a way that the opening 2 tapers in a direction opposite to the direction 3 of rotation.
  • the inner faces 8 of the mixing member 4 are slanted accordingly.
  • the slant of the central rib 9b or of the arc-shaped section 9c in this case preferably relates to a straight line perpendicular to the plane of the opening 2.
  • the central rib 9b, the arc-shaped section 9c and/or the lateral rib 9a are slanted at an angle of 30° to 60°. This ensures that the substance particles of the mixing material are specifically reflected or deflected on the inner faces of the mixing member 4. At higher rotational speeds of the mixing tool, the influence of the opening 2 on the mixing effect is thus reduced in an improved manner.
  • the proposed mixing tool enables an energy-efficient start of the mixing process.
  • the rotational speed of the mixing member 1 increases, a good specific mixing is then made possible due to the specific converging flow in the mixing member, because the influence of the opening 2 on the mixing effect decreases depending on the rotational speed.
  • the mixing member 1 can also have a frontal edge 4a on the inflow side 13 which can be formed with the shape of a blade edge, in particular to reduce the resistance.
  • the opening 2 of the mixing member is preferably oriented perpendicular to the plane of rotation of the mixing tool 1. This is important for the mixing characteristics of the mixing member.
  • the mixing member 4 seen from the side, is preferably provided at an angle on the supporting arm 7.
  • the mixing member forms an angle of 10 ° to 50 °, more preferably of 20 ° to 40 °, to the supporting arm axis 10.
  • the arc-shaped section 4c of the mixing member 4 then forms an, in particular wedge-shaped, gap with the wall of the mixing container.
  • the arc-shaped section 4c is preferably spaced closer to the wall of the mixing container in the front region, i.e. at the inflow side 13, than in the rear region, i.e. at the outflow side 14 of the mixing member. In this manner, the angle of inclination between the mixing member 4 and the wall of the mixing container can be specifically adjusted.
  • the angle of inclination being open in a direction opposite to the direction 3 of rotation, compactions of the mixing material between the wall of the mixing container and the mixing member can be avoided. This also makes it possible to keep the energy consumption of the drive shaft low.
  • the angle of inclination and the distance of the mixing member 4 from the wall of the mixing container can be specifically optimized.
  • the mixing tool 1 is illustrated in a rear view in Fig. 3 .
  • the rear of the mixing member 4b is preferably flat.
  • the arc-shaped section 4c is in this case preferably configured as a bent plate, in particular with a thickness of at least 5 mm. Accordingly, the arc-shaped section 4c on the whole can be configured as a slanted plate, seen in the direction of rotation. This permits a slant of the inner face 8 on the arc-shaped section 4c and at the same time, towards the outside, a suitable angle of inclination of the mixing member 4 on the wall in the mixing container.
  • the mixing tool 1 preferably consists of steel, particularly preferably of stainless steel, in order to obtain a wear-adapted configuration.
  • several proposed mixing tools 1 are disposed on a drive shaft.
  • the mixing tools 1 are disposed on the drive shaft in such a way that the individual mixing members of the mixing tool sweep over substantially the entire inner surface of the mixing container during a rotation of the drive shaft of 360 °. It is thus ensured that no volume region of the mixing container is left out during the mixing process.

Landscapes

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

Claims (6)

  1. Mischwerkzeug, das geeignet ist für Mischer mit einem Mischbehälter, und das mit Hilfe eines Tragarms (7) an einer Antriebswelle befestigt werden kann, die sich durch den Mischbehälter erstreckt und das Mischwerkzeug in einer Drehrichtung (3) drehen kann, wobei das Mischwerkzeug den Tragarm (7) und ein an dem Tragarm (7) angeordnetes Mischelement (4) aufweist, wobei das Mischelement (4) eine Öffnung (2) aufweist, welche durch das Mischelement (4) von einer Einströmseite (13) zu einer Ausströmseite (14) in der Drehrichtung (3) verläuft, wobei die Einströmseite (13) an dem Mischelement (4) einen größeren Querschnitt aufweist als die Ausströmseite (14), um mit dem Mischelement (4) während der Drehung einen konvergierenden Strom des Mischmaterials entgegen der Drehrichtung (3) zu erzeugen, wobei die Öffnung (2) des Mischelementes (4) zumindest in einigen Bereichen, vorzugsweise auf der Seite des Mischelementes (4), die von dem Tragarm (7) abgewandt ist, bogenförmig oder kreisbogenförmig ausgebildet ist, dadurch gekennzeichnet, dass das Mischelement (4) einen bogenförmigen Abschnitt (4c), zumindest eine Seitenrippe (5) und eine Mittelrippe (6) aufweist, und dass das Mischelement (4) an jeder der beiden Seiten des bogenförmigen Abschnitts (4c) Seitenrippen (5) aufweist, die über die an dem Tragarm (7) befestigte Mittelrippe (6) verbunden sind.
  2. Mischwerkzeug gemäß dem vorherigen Anspruch, dadurch gekennzeichnet, dass die Öffnung (2) des Mischelementes (4) in eine der Drehrichtung (3) entgegengesetzten Richtung spitz zuläuft, vorzugsweise mit abgeschrägten Innenflächen (8) an dem Mischelement (4).
  3. Mischwerkzeug gemäß irgendeinem der vorherigen Ansprüche, dadurch gekennzeichnet, dass der Abstand zwischen der Einströmseite (13) und der Ausströmseite (14) des Mischelementes (4) wenigstens 20 mm, bevorzugter wenigstens 40 mm beträgt.
  4. Mischwerkzeug gemäß irgendeinem der vorherigen Ansprüche, dadurch gekennzeichnet, dass das Mischelement (4) im Wesentlichen schaufelförmig ausgebildet ist, wobei die Öffnung (2) einen Ausschnitt auf der Innenseite der Schaufelform bildet.
  5. Mischwerkzeug gemäß irgendeinem der vorherigen Ansprüche, dadurch gekennzeichnet, dass das Mischelement (4) auf der Einströmseite (13) eine Vorderkante (4a) aufweist, die, in Drehrichtung (3) gesehen, vorzugsweise in Form einer Klingenkante ausgebildet ist, insbesondere um auf einen Punkt hin spitz zuzulaufen.
  6. Mischwerkzeug gemäß irgendeinem der vorherigen Ansprüche, dadurch gekennzeichnet, dass die Öffnung (2) des Mischelementes (4) im Wesentlichen senkrecht zu der Drehebene des Mischwerkzeugs (1) ausgerichtet ist.
EP14153246.5A 2013-02-21 2014-01-30 Mischwerkzeug Not-in-force EP2769763B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102013202876.8A DE102013202876B3 (de) 2013-02-21 2013-02-21 Mischwerkzeug

Publications (3)

Publication Number Publication Date
EP2769763A2 EP2769763A2 (de) 2014-08-27
EP2769763A3 EP2769763A3 (de) 2015-02-18
EP2769763B1 true EP2769763B1 (de) 2016-11-16

Family

ID=50068802

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14153246.5A Not-in-force EP2769763B1 (de) 2013-02-21 2014-01-30 Mischwerkzeug

Country Status (5)

Country Link
EP (1) EP2769763B1 (de)
DE (1) DE102013202876B3 (de)
DK (1) DK2769763T3 (de)
ES (1) ES2608557T3 (de)
PL (1) PL2769763T3 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014218463A1 (de) 2014-09-15 2016-03-17 Gebrüder Lödige Maschinenbau GmbH Mischwerkeinrichtung für industrielle Anwendungen

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010122092A2 (de) * 2009-04-22 2010-10-28 Richard Frisse Gmbh Scher-/mischwerkzeug

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1744294A (en) 1928-01-05 1930-01-21 George W Adams Mixing machine
DE1276986B (de) * 1962-03-10 1968-09-05 Fritz Loedige Pflugscharaehnliches Mischwerkzeug
CH675215A5 (de) * 1988-02-08 1990-09-14 Kurt Walter Wyss
GB8827302D0 (en) 1988-11-23 1988-12-29 Nytek As Mixing device
DE4129594C2 (de) 1991-09-06 1994-06-23 Marquardt Juergen Vorrichtung zum Behandeln einer Flüssigkeit
CA2727725A1 (en) * 2008-06-11 2009-12-17 Gwyneth Christine Pett Digging tool and method of using the same
DE102010049034B4 (de) 2010-10-21 2012-11-22 VISCO JET Rührsysteme GmbH Rührorgan und Rührwerk zum Mischen und/oder Homogenisieren strömungsfähiger Medien

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010122092A2 (de) * 2009-04-22 2010-10-28 Richard Frisse Gmbh Scher-/mischwerkzeug

Also Published As

Publication number Publication date
PL2769763T3 (pl) 2017-03-31
EP2769763A3 (de) 2015-02-18
DE102013202876B3 (de) 2014-05-28
EP2769763A2 (de) 2014-08-27
DK2769763T3 (en) 2017-01-09
ES2608557T3 (es) 2017-04-12

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