EP0211230A2 - 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
EP0211230A2
EP0211230A2 EP86108925A EP86108925A EP0211230A2 EP 0211230 A2 EP0211230 A2 EP 0211230A2 EP 86108925 A EP86108925 A EP 86108925A EP 86108925 A EP86108925 A EP 86108925A EP 0211230 A2 EP0211230 A2 EP 0211230A2
Authority
EP
European Patent Office
Prior art keywords
trough
mixing
axis
mixing blades
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.)
Granted
Application number
EP86108925A
Other languages
German (de)
English (en)
Other versions
EP0211230A3 (en
EP0211230B1 (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.)
Badische Maschinenfabrik GmbH
BMD Badische Maschinenfabrik Durlach GmbH
Original Assignee
Badische Maschinenfabrik GmbH
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.)
Filing date
Publication date
Application filed by Badische Maschinenfabrik GmbH, BMD Badische Maschinenfabrik Durlach GmbH filed Critical Badische Maschinenfabrik GmbH
Publication of EP0211230A2 publication Critical patent/EP0211230A2/fr
Publication of EP0211230A3 publication Critical patent/EP0211230A3/de
Application granted granted Critical
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 at least two groups of mixing tools attached to arms, which are at different distances from the trough axis and from the Bottom of the trough at a relative speed, preferably in opposite directions, and are inclined at opposite angles to the tangent of their orbit such that the mixing tools of the outer group convey the mix to the inside, the mixing tools of the inner group convey the mix to the outside.
  • 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. Are there any gears still connected between the drive and the support arms ? planned.
  • This well-known mixer which is particularly suitable for mixing building materials, e.g. concrete mixes, is determined, has an inner and an outer group of mixing tools rotating in the same direction of rotation above the trough bottom and a group of mixing tools rotating in their overlap area and above them in the opposite direction.
  • the mixing tools are simple plates standing perpendicular to the trough bottom, which are set at an angle to the tangent of their orbit. Dur i d different adjustment of the mixing tools is taken along the mixed material from both the outer as well as from the inner portion of the Togs always transported in the direction of Oberlappungs Schemes of the two first mixing tool groups and there by the overlying mixing tool group in the opposite direction.
  • 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 in molding sand mixtures should be surrounded by a binder layer, which on the one hand means a corresponding contact time between the binder and the molding sand particles, and on the other hand corresponding Forces, such as frictional forces, are required which lead to the binding of the binder on the particles.
  • a mixer of the abovementioned construction cannot fulfill these functions, or can do so only inadequately. It has also 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 optimum mixing quality, particularly in the case of foundry mold sands, requires both horizontal and vertical movement components within the mixture.
  • 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 material to be mixed 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 shovel-like as shell segments of a circular cylinder with approximately horizontally arranged axis and the mixing blades of the outer group with its concave side inwards, the inner group with its concave side facing outwards and give the mix a twisting movement and that the inside of the outer wall and the inner wall of the trough are assigned peripheral wall wipers .
  • 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 imposed on the material to be mixed . Due to the swirl 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 high filling level 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 jacket segments of a circular cylinder, they are easy to manufacture 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 cut back to the absolutely necessary area in order to obtain the desired movements, and unnecessary pressure and frictional forces that 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 to be set in a swirl movement is cut / at different heights.
  • the mixing blades are inclined with respect to the horizontal plane in the opposite direction to their direction of rotation. This measure allows the mixed material to be given an even more pronounced vertical movement component.
  • the mixing blades of the outer group consist of two or more jacket segments of a circular cylinder arranged one above the other, which are connected along a jacket 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 jacket segments has a greater radial distance from the trough axis than the outer edges delimiting the jacket 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 sit on support arms 10 and 11, which in turn are connected to a drive via drive shafts 12, 13, if necessary 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 blades 7, 8 of group 5 can dip into the trough at different depths, as can also be seen from FIG. 1.
  • FIG. 2 differs from that according to FIG. 1 essentially only in that the different radial spacing 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 06 with respect to the trough axis 4 or the drive shaft 13 of the external group 6, so that the mixing blades 7, 8 are different on the one hand Are arranged height 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 scraper 17 assigned to inner wall 18 of trough 1.
  • These wipers can consist of simple slanted strips.
  • the mixing blades 7, 8 and 9 are partially cylindrical 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 by 26 in FIG.
  • 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 rising in the opposite direction of rotation 15. 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 those for the inner wall and the trough bottom, have adjustable and exchangeable wear strips 32.
  • the horizontally and vertically arranged mixing blades 9 and 33 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)
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 true EP0211230A2 (fr) 1987-02-25
EP0211230A3 EP0211230A3 (en) 1987-08-19
EP0211230B1 EP0211230B1 (fr) 1989-10-11

Family

ID=6275349

Family Applications (1)

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 (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT400229B (de) * 1989-12-06 1995-11-27 Fischer Ag Georg Einrichtung zur chargenweisen aufbereitung von schüttgut
CN108099007A (zh) * 2018-01-10 2018-06-01 高佳 一种用于建筑的多桶式搅拌机

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE69421505T2 (de) * 1993-12-27 2000-06-21 Kajima Corp 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.
AU2007247760C1 (en) * 2006-05-04 2013-01-31 Swizzzprozzz Ag Device for processing foodstuffs
US7669793B2 (en) * 2007-08-17 2010-03-02 Kwok Kuen So Food cutting device

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1557252A1 (de) * 1966-11-12 1970-04-02 Zyklos Metallbau Kg Gleichstrommischer
DE2318692B1 (de) * 1973-04-13 1974-08-08 Badische Maschinenfabrik Gmbh, 7500 Karlsruhe Mischer für Formsand
DE2603057A1 (de) * 1976-01-28 1977-08-11 Heinz Hammann Mischmaschine
US4192615A (en) * 1979-02-23 1980-03-11 Fargo Machine & Tool Company Sand mulling machine plow
DE8234900U1 (de) * 1981-12-18 1983-03-24 Lüber, Werner, Bazenheid Rotationsmischvorrichtung fuer granulare gueter, insbesondere kernsand

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1027531A (en) * 1912-02-14 1912-05-28 Alpheus Fay Aerating butter-separator.
DE801618C (de) * 1948-10-02 1951-01-15 Schlosser & Co G M B H Mischer fuer Sand, Kies o. dgl.
GB753156A (en) * 1954-03-19 1956-07-18 Atomic Energy Authority Uk Improvements in or relating to paddles for stirring and mixing granular or powdered solids
DE1096873B (de) * 1957-03-30 1961-01-12 Draiswerke Ges Mit Beschraenkt Mischmaschine mit an der Ruehrwerkswelle befestigten pflugscharartigen Ruehrwerkzeugen
CH429398A (de) * 1965-04-06 1967-01-31 Fischer Ag Georg Mischmaschine, insbesondere für Formsand
US3322404A (en) * 1965-04-22 1967-05-30 Nat Eng Co Mixer including mulling wheel with resilient tire means to facilitate wheel rotation
NL6611612A (fr) * 1966-08-18 1968-02-19
DE2446607C3 (de) * 1974-09-30 1978-09-28 Schlosser & Co Gmbh, 6209 Aarbergen Ringtrogmischer
DE2729477A1 (de) * 1977-06-30 1979-01-11 Loedige Maschbau Gmbh Geb Pflugscharartiges mischwerkzeug
DE2738123A1 (de) * 1977-08-24 1979-03-01 Ibag Vertrieb Gmbh Mischmaschine
DE3114477C1 (de) * 1981-04-10 1982-11-04 Walter Stahl Ringtrogzwangsmischer
US4509860A (en) * 1983-05-03 1985-04-09 Lasar Manufacturing Co. Dual action mixer

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1557252A1 (de) * 1966-11-12 1970-04-02 Zyklos Metallbau Kg Gleichstrommischer
DE2318692B1 (de) * 1973-04-13 1974-08-08 Badische Maschinenfabrik Gmbh, 7500 Karlsruhe Mischer für Formsand
DE2603057A1 (de) * 1976-01-28 1977-08-11 Heinz Hammann Mischmaschine
US4192615A (en) * 1979-02-23 1980-03-11 Fargo Machine & Tool Company Sand mulling machine plow
DE8234900U1 (de) * 1981-12-18 1983-03-24 Lüber, Werner, Bazenheid Rotationsmischvorrichtung fuer granulare gueter, insbesondere kernsand

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT400229B (de) * 1989-12-06 1995-11-27 Fischer Ag Georg Einrichtung zur chargenweisen aufbereitung von schüttgut
CN108099007A (zh) * 2018-01-10 2018-06-01 高佳 一种用于建筑的多桶式搅拌机

Also Published As

Publication number Publication date
EP0211230A3 (en) 1987-08-19
DE3524537A1 (de) 1987-01-22
DE3666159D1 (en) 1989-11-16
CA1269101A (fr) 1990-05-15
EP0211230B1 (fr) 1989-10-11
US4741483A (en) 1988-05-03

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