EP0211230B1 - Dispositif pour mélanger des matériaux solides et des liquides - Google Patents

Dispositif pour mélanger des matériaux solides et des liquides Download PDF

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Publication number
EP0211230B1
EP0211230B1 EP86108925A EP86108925A EP0211230B1 EP 0211230 B1 EP0211230 B1 EP 0211230B1 EP 86108925 A EP86108925 A EP 86108925A EP 86108925 A EP86108925 A EP 86108925A EP 0211230 B1 EP0211230 B1 EP 0211230B1
Authority
EP
European Patent Office
Prior art keywords
mixing
trough
axis
wall
group
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
EP86108925A
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German (de)
English (en)
Other versions
EP0211230A3 (en
EP0211230A2 (fr
Inventor
Norbert Ing. Grad. Damm
Thomas Dr. Parr
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.)
BMD Badische Maschinenfabrik Durlach GmbH
Original Assignee
BMD Badische Maschinenfabrik Durlach 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.)
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Publication date
Application filed by BMD Badische Maschinenfabrik Durlach GmbH filed Critical BMD Badische Maschinenfabrik Durlach GmbH
Publication of EP0211230A2 publication Critical patent/EP0211230A2/fr
Publication of EP0211230A3 publication Critical patent/EP0211230A3/de
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Publication of EP0211230B1 publication Critical patent/EP0211230B1/fr
Expired 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
    • B01F27/11—Stirrers characterised by the configuration of the stirrers
    • B01F27/112—Stirrers characterised by the configuration of the stirrers with arms, paddles, vanes or blades
    • 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
    • B01F27/80—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis
    • B01F27/85—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis with two or more stirrers on separate shafts

Definitions

  • the invention relates to a device for mixing solids with one another and with liquids, in particular for the production of foundry molding sand mixtures, consisting of a circular fixed trough with a vertical axis and with inner and outer wall and at least two groups of mixing tools attached to arms, which with Varying distance from the trough axis and from the bottom of the trough at a relative speed and inclined at opposite angles to the tangent of their orbit are such that the mixing tools of the outer group convey the mixture inwards, the mixing tools of the inner group convey the mixture outwards.
  • the drive of the mixing tool groups is located in the area of the trough axis, each group of tools being assigned its own drive.
  • the mixing blades are connected to the drive shaft via support arms. If necessary, gear connections are also provided between the drive and the support arms.
  • This known mixer which is particularly suitable for mixing building materials, e.g. B. concrete mixtures, has an inner and an outer, above the trough bottom group of mixing tools of the same direction of rotation and in their overlap area and above the same in the opposite direction rotating group of mixing tools.
  • the mixing tools are simple plates standing perpendicular to the trough bottom, which are set at an angle to the tangent of their orbit.
  • the mixer described above Compared to mixers with mixing tools rotating only in one direction or with stationary tools and rotating trough, the mixer described above has the great advantage that the material to be mixed is not only moved alternately from the outside in and vice versa, but is also subjected to constant shear stress. As a result, a homogeneous mixture with high throughput is achieved for a large number of starting components.
  • each individual particle should be surrounded by a binder layer in molding sand mixtures, which on the one hand means a corresponding contact time between the binder and the molding sand particles, on the other hand corresponding forces, e.g. B. friction forces required, which lead to the imprinting of the binder on the particles.
  • a mixer of the abovementioned construction cannot fulfill these functions, or can do so only inadequately. Also has. It has been shown that the mixing material no longer runs quickly enough with increasing toughness, but rather is carried along over a longer distance, so that the longer the mixture, the longer the mixing time. Finally, the mixing tools, which only rotate in two levels, limit the filling height and thus the throughput per mixing cycle.
  • the invention is based first of all on the known fact that an optimal mixing quality, particularly in the case of foundry molding sands, requires both horizontal and vertical movement components within the material to be mixed.
  • the mixture should also be subjected to constant shear stresses in order to effectively counteract the formation of agglomerates. Proceeding from this, the object of the invention is to communicate the aforementioned movement and force components to the mix by means of simply constructed mixing blades and to increase the performance compared to conventional mixers.
  • this object is achieved according to the invention in that the mixing tools are designed in the manner of a shovel as shell segments of a circular cylinder with an axis which is arranged approximately horizontally or inclines against its direction of rotation , and that the mixing blades of the outer group with their concave side inwards, that of the inner group with their concave side facing outwards and each provided with a leading cutting edge and thereby impart a twisting movement to the material to be mixed, and that the inner sides of the outer wall and the Circumferential wall wipers are assigned to the inner wall of the trough.
  • the shovel-shaped mixing tools according to the invention peel a partial stream out of the material to be mixed by means of the leading cutting edge and, depending on the angle, deflect it inwards or outwards.
  • a swirl movement is imposed on this subset, within which the mixture components are moved both horizontally and vertically.
  • this “peeling process” creates shear and compressive forces that imprint the binder on the molding sand particles. This process creates patties within the material to be mixed, which partly disintegrate again after leaving the trailing edge of the mixing blade or are dissolved again by the other mixing blade groups.
  • the mixing blades of the two or more groups are placed at opposite angles to the tangent of their orbit, the required radial movement from the inner region of the trough to the outside or from the outer region to the inside is also forced on the material to be mixed . Because of the swirling movement, even with viscous mixtures, it is avoided that the mix is only taken along in the direction of circulation over longer distances and is not circulated.
  • the mixing blades in particular the inner group at different heights above the trough bottom, a large filling height is possible, but at the same time it ensures that there is constant transport from top to bottom and vice versa. Because the mixing blades consist of shell segments of a circular cylinder, they can be easily manufactured in terms of production technology.
  • Mixers with curved mixing blades with a horizontal axis of curvature are known (DE-C-801 618), but they are located in only one plane, so that the filling height is very low. Furthermore, transport mainly takes place in a horizontal plane.
  • the mixing blades are not partially cylindrical, so that their production is relatively complex. After all, the innermost and outermost mixing blades act as wall wipers and are therefore exposed to heavy wear. This is all the more so as they also act as a floor scraper, like all other mixing blades.
  • the mixing blades have a leading cutting edge inclined in the opposite direction of rotation and an approximately horizontally running lower cutting edge, it also being advantageous that the leading cutting edge merges into the lower cutting edge via an arcuate curved edge.
  • the jacket segment forming the mixing blade is thus cut back to the absolutely necessary area in order to obtain the desired movements, and unnecessary pressure and frictional forces which do not bring about a mixing effect need not be overcome. Caking on the leading cutting edge is also avoided in this way and the partial flow which is to be swirled is cut at different heights.
  • the mixing blades of the outer group consist of two or more shell segments of a circular cylinder arranged one above the other, which are connected along a shell line.
  • the mix can be gripped on the outside by a single tool over the entire filling level and divided into two or more partial flows, each of which is set in a swirling movement.
  • the connecting line of the two shell segments has a greater radial distance from the trough axis than the outer edges delimiting the shell segments.
  • the effectiveness of the mixer can be further increased by, for example, the mixing blades of the inner group being at different distances from the trough axis and / or from the bottom of the trough.
  • the vertical movement component can be influenced or amplified in that, for example, the mixing blades of the inner group are driven about an axis inclined to the trough axis. It is also possible to drive the mixing blades of the inner group about an axis arranged eccentrically to the trough axis.
  • the outer group of mixing blades is assigned further partially cylindrical mixing blades with a perpendicular axis of curvature, the leading edge of which is at a greater radial distance from the trough axis than the trailing edge.
  • the mixing blades with a vertical axis of curvature guide the mix primarily inwards, while those with a horizontal axis of curvature give the mix an inward twisting movement.
  • a partially cylindrical mixing blade with a vertical axis of curvature is connected to a mixing blade with a horizontal axis, the latter being arranged at the top, while the former extends approximately to the bottom of the trough.
  • the wall wipers for the inner wall of the trough with the mixing blades of the inner group and those for the outer wall of the trough with the mixing blades of the outer group rotate synchronously.
  • the mixing blades and wall wipers can thus be supplied by the same drive.
  • a wall scraper for the outer wall of the trough is preferably arranged in the circumferential direction behind each mixing blade of the outer group. Characterized in that the wall scraper runs after the mixing blade, the stripped material falls into the free space which has been generated by the leading mixing blade, which displaces the material inwards. This stripped material is then gripped by the subsequent mixing blade and transported inwards. This ensures that no material remains in the area near the wall for a long time.
  • the wall wipers can have replaceable and / or adjustable wear strips.
  • the mixer shown in Figures 1 to 9 consists of a fixed trough 1 with a cylindrical jacket 2 and a horizontal bottom 3.
  • the axis of the trough is designated by 4.
  • two - groups 5 and 6 of mixing blades engage in the trough from above, group 5 having mixing blades 7 and 8 and group 6 having mixing blades 9.
  • the mixing blades are shown in Figures 1 to 3 for ease of illustration only as a rectangular structure. Their actual shape is described with reference to FIGS. 4 ff.
  • the groups 5 and 6 of mixing blades 7, 8 and 9 run at different radial distances from the trough axis 4. For this purpose, they are seated on support arms 10 and 11, which in turn are connected to a drive via drive shafts 12, 13, possibly with the interposition of gears. As indicated by the directional arrows A and B, the mixing blades 7 and 8 of group 5 rotate in opposite directions to the mixing blades 9 of outer group 6.
  • the mixing blade 7 of the inner group 5 can have a greater radial distance from the trough axis 4 than the mixing blade 8 of the same group.
  • the two mixing heads 7, 8 of group 5 can dip into the trough at different depths, as can also be seen in FIG. 1.
  • Figure 2 differs from that of Figure 1 essentially only in that the different Radial distance of the mixing blades 7, 8 of the group 5 can also be achieved by axially displacing the drive shaft 12 with respect to the trough axis 4. This also creates an eccentric orbit.
  • the drive shaft 12 of the inner group 5 with the mixing blades 7 and 8 is inclined by the angle a with respect to the trough axis 4 and the drive shaft 13 of the outer group 6, so that the mixing blades 7, 8 are at different heights are arranged and on the other hand give the mix both a horizontal and a vertical movement component.
  • the device in addition to the groups 5 and 6 of mixing blades 7, 8 and 9 already described, additionally has at least one wall scraper 14 lying against the outer wall 3 of the trough, a horizontally lying floor scraper 16 and one of the inner wall 18 of the trough 1 assigned to wall scraper 17.
  • These wipers can consist of simple slanted strips.
  • the mixing blades 7, 8 and 9 are partially cylindrical curved or formed by cylinder cutouts.
  • the generation of the blades 7, 8 of the inner group 5 is indicated schematically in FIGS. 8 and 9.
  • a cylinder 20 is shown there with dashed lines, the blades 7, 8 being formed from a segment 21 of this cylinder, ie having a curvature with the radius r (FIG. 8).
  • the other contour of segment 21 can be seen from the projection according to FIG.
  • the direction of rotation A of the blade 7 or 8 is also indicated.
  • the blade 7, 8 has a leading cutting edge 22, which is inclined to rise in the direction of rotation 14, and a further horizontal cutting edge 23.
  • the cutting edge 22 merges via an arcuate section 25 into a section 24 of the horizontal edge 23 rising to the rear.
  • the apex line or the parallel axis of curvature of the blades 7, 8 is indicated in FIG. 9 by 26.
  • the apex line or axis 26 of the blade 7, 8 is set at an angle with respect to the tangent of the orbit, so that the mixed material captured by the mixing blade 7, 8 is transported from the inside to the outside and at the same time is guided in a swirling motion .
  • the mixing blades 9 are formed from two superposed partial cylinders 27, 28, which are connected to one another along a surface line 29, which in turn lies further outside than the outer boundary edges 30, 31 of the two partial cylinders 27, 28.
  • the axes 26 of the mixing blades 7, 8 of the inner group 5 and the axes of the partial cylinders 27, 28 of the mixing blades 9 of the outer group are arranged horizontally.
  • the axis of the partial cylinders 27, 28 is shown increasing in the opposite direction of rotation B. Furthermore, the mixing blades 7, 8 are inserted radially further outwards and they engage less deeply in the trough.
  • the inner group has, in addition to the mixing blades 7 and 8, a third mixing blade 15 of the same contour. These three mixing blades are arranged at different radial distances from the trough axis 4 (FIG. 11) and at different heights (FIG. 10) above the trough bottom 3. They all run in the direction of A.
  • the outer group 6 has two diametrically arranged mixing blades 9 with a horizontal axis of curvature, which are each attached to a support arm 11 together with a wall scraper 14 for the outer trough wall 2. As shown in FIG. 11, the wall scraper 14 runs behind the respective mixing blade 9 in direction B and transports the material into the space created by the mixing blade.
  • the wall wipers 14, like also the 11, 16 for the inner wall and the trough bottom, have adjustable and interchangeable wear strips 32.
  • the mixing blades 9 and 33 arranged horizontally and vertically are connected to one another and fastened to the support arms 11.
  • the leading edge 34 of the vertical mixing blade 33 has a greater distance from the trough axis 4 than the trailing edge 35.

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

Claims (17)

1. Dispositif pour mélanger des substances solides ensemble et avec des liquides, notamment pour-fabriquer des mélanges de sables de moulage pour fonderie, constitué par une cuve (1) circulaire fixe comportant un axe vertical (4) ainsi qu'une paroi intérieure (18) et une paroi extérieure (2), et constitué également d'au moins deux groupes (5, 6) d'outils de malaxage (7, 8, 9) fixés sur des bras (10, 11), lesquels outils tournent à une vitesse relative à une distance variable de l'axe de la cuve et du fond (3) de la cuve, et sont inclinés selon des angles opposés, par rapport à la tangente de leur trajectoire, de telle sorte que les outils de malaxage (9) du groupe extérieur (6) transportent le produit de mélange vers l'intérieur et les outils de malaxage (7, 8) du groupe intérieur
(5) transportent le produit de mélange vers l'extérieur caractérisé en ce que les outils de malaxage (7, 8, 9) sont réalisés à la façon d'aubes, en tant que segments d'enveloppe d'un cylindre circulaire dont l'axe (26) est disposé sensiblement horizontalement ou incliné vers le haut en sens opposé de son sens de rotation, et en ce que les aubes de malaxage (9) du groupe extérieur (6) sont orientées avec leur côté concave vers l'intérieur, les aubes de malaxage (7, 8) du groupe intérieur (5) sont orientées avec leur côté concave vers l'extérieur et sont respectivement pourvues d'une arête de coupe avant (22), et confèrent ainsi un mouvement de giration au produit de mélange, et en ce que des racleurs de paroi (14, 17) tournants coopèrent avec les côtés intérieurs de la paroi extérieure (2) et de la paroi intérieure (18) de la cuve (11).
2. Dispositif selon la revendication 1, caractérisé en ce que les aubes de malaxage (7, 8) comportent une arête de coupe (22) inclinée en sens inverse du sens de rotation et une arête de coupe inférieure (23) avant sensiblement horizontale.
3. Dispositif selon la revendication 1 ou 2, caractérisé en ce que l'arête de coupe avant (22) se raccorde par une arête (25) incurvée en forme d'arc à l'arête de coupe inférieure (23, 24).
4. Dispositif selon l'une des revendications 1 à 3, caractérisé en ce que l'arête de coupe inférieure des aubes de malaxage (7, 8) est constituée par une portion horizontale (23) et une portion (24) inclinée vers le haut en sens inverse du sens de rotation (A).
5. Dispositif selon l'une des revendications 1 à 4, caractérisé en ce que les aubes de malaxage (9) du groupe extérieur sont constituées par deux segments d'enveloppe, ou davantage, d'un cylindre circulaire (27, 28) parallèles, disposés l'un au-dessus de l'autre, qui sont reliés le long d'une génératrice (29).
6. Dispositif selon la revendication 5, caractérisé en ce que la ligne de liaison (29) des deux segments d'enveloppe (27, 28) est à une distance radiale de l'axe de la cuve (4) plus grande que les arêtes extérieures (30, 31) délimitant les segments d'enveloppe (27, 28).
7. Dispositif selon l'une des revendications 1 à 6, caractérisé en ce que les aubes de malaxage (7, 8) du groupe intérieur sont à une distance variable de l'axe (4) de la cuve.
8. Dispositif selon l'une des revendications 1 à 7, caractérisé en ce que les aubes de malaxage (7, 8) du groupe intérieur (5) sont à une distance variable du fond (3).
9. Dispositif selon l'une des revendications 1 à 8, caractérisé en ce que les aubes de malaxage (7, 8) du groupe intérieur (5) sont entraînées autour d'un axe (12) incliné par rapport à l'axe (4) de la cuve.
10. Dispositif selon l'une des revendications 1 à 8, caractérisé en ce que les aubes de malaxage (7, 8) du groupe intérieur (5) sont entraînées autour d'un axe (12) excentré par rapport à l'axe (4) de la cuve.
11. Dispositif selon l'une des revendications 1 à 10, caractérisé en ce qu'au groupe extérieur (6) des aubes de malaxage (9) sont associées d'autres aubes de malaxage (33) constituées chacune par une partie de cylindre à axe vertical, dont l'arête avant (34) est située à une distance radiale de l'axe (4) de la cuve plus grande que l'arête arrière (35).
12. Dispositif selon la revendication 11, caractérisé en ce que chaque aube de malaxage (33) constituée par une partie de cylindre à axe vertical est reliée à une aube de malaxage (9) ayant un axe horizontal, cette dernière étant placée en haut, tandis que la première va .sensiblement jusqu'au fond (3) de la cuve (2).
13. Dispositif selon la revendication 12, caractérisé en ce que les aubes de malaxage (9) à axe horizontal du groupe extérieur (6) dépassent la surface du produit de mélange.
14. Dispositif selon l'une des revendications 1 à 13, caractérisé en ce que les racleurs (17) pour la paroi intérieure (18) de la cuve (1) tournent en synchronisme avec les aubes de malaxage (7, 8) du groupe intérieur (5) et les racleurs (14) pour la paroi extérieure (2) de la cuve (1) tournent en synchronisme avec les aubes de malaxage (9) du groupe extérieur (6).
15. Dispositif selon l'une des revendications 1 à 14, caractérisé en ce qu'un racleur (14) pour la paroi extérieure (2) de la cuve (1) est respectivement placé derrière chaque aube de malaxage (9, 33) du groupe extérieur (6) dans le sens de la rotation.
16. Dispositif selon l'une des revendications 1 à 15, caractérisé en ce que les racleurs de paroi (14, 17) comportent des bandes d'usure qui peuvent être remplacées et/ou réglées (32).
EP86108925A 1985-07-10 1986-07-01 Dispositif pour mélanger des matériaux solides et des liquides Expired EP0211230B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3524537 1985-07-10
DE19853524537 DE3524537A1 (de) 1985-07-10 1985-07-10 Vorrichtung zum mischen von feststoffen und fluessigkeiten

Publications (3)

Publication Number Publication Date
EP0211230A2 EP0211230A2 (fr) 1987-02-25
EP0211230A3 EP0211230A3 (en) 1987-08-19
EP0211230B1 true EP0211230B1 (fr) 1989-10-11

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Application Number Title Priority Date Filing Date
EP86108925A Expired EP0211230B1 (fr) 1985-07-10 1986-07-01 Dispositif pour mélanger des matériaux solides et des liquides

Country Status (4)

Country Link
US (1) US4741483A (fr)
EP (1) EP0211230B1 (fr)
CA (1) CA1269101A (fr)
DE (2) DE3524537A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4036788A1 (de) * 1989-12-06 1991-06-13 Fischer Ag Georg Einrichtung zur chargenweisen aufbereitung von schuettgut

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DE69421505T2 (de) * 1993-12-27 2000-06-21 Kajima Corp., Tokio/Tokyo Mischvorrichtung und Verfahren
DE19950743A1 (de) * 1999-10-21 2001-04-26 Harald Kniele KKM-Mischer
ITMC20010043U1 (it) * 2001-10-15 2003-04-15 Officine Galletti Omg Srl Crociera leggera ed economica per mescolatrici per calcestruzzo,maltae simili.
CN101478907B (zh) * 2006-05-04 2011-09-07 斯维兹普鲁兹股份公司 用于处理食品的设备
US7669793B2 (en) * 2007-08-17 2010-03-02 Kwok Kuen So Food cutting device
CN108099007A (zh) * 2018-01-10 2018-06-01 高佳 一种用于建筑的多桶式搅拌机

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4036788A1 (de) * 1989-12-06 1991-06-13 Fischer Ag Georg Einrichtung zur chargenweisen aufbereitung von schuettgut

Also Published As

Publication number Publication date
EP0211230A3 (en) 1987-08-19
EP0211230A2 (fr) 1987-02-25
DE3524537A1 (de) 1987-01-22
DE3666159D1 (en) 1989-11-16
US4741483A (en) 1988-05-03
CA1269101A (fr) 1990-05-15

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