EP0645179B1 - Moulin à frottement et malaxeur contenant ledit moulin - Google Patents

Moulin à frottement et malaxeur contenant ledit moulin Download PDF

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Publication number
EP0645179B1
EP0645179B1 EP94114511A EP94114511A EP0645179B1 EP 0645179 B1 EP0645179 B1 EP 0645179B1 EP 94114511 A EP94114511 A EP 94114511A EP 94114511 A EP94114511 A EP 94114511A EP 0645179 B1 EP0645179 B1 EP 0645179B1
Authority
EP
European Patent Office
Prior art keywords
stator
grinding
rotor
mixing
grinding mill
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 - Lifetime
Application number
EP94114511A
Other languages
German (de)
English (en)
Other versions
EP0645179A1 (fr
Inventor
Hans Wetzel
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.)
Draiswerke GmbH
Original Assignee
Draiswerke 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 Draiswerke GmbH filed Critical Draiswerke GmbH
Publication of EP0645179A1 publication Critical patent/EP0645179A1/fr
Application granted granted Critical
Publication of EP0645179B1 publication Critical patent/EP0645179B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B01F27/60—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis
    • B01F27/70—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis with paddles, blades or arms
    • 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
    • B01F33/83—Mixing plants specially adapted for mixing in combination with disintegrating operations
    • B01F33/833—Devices with several tools rotating about different axis in the same 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
    • B01F33/836—Mixing plants; Combinations of mixers combining mixing with other treatments
    • B01F33/8361—Mixing plants; Combinations of mixers combining mixing with other treatments with disintegrating
    • B01F33/83612—Mixing plants; Combinations of mixers combining mixing with other treatments with disintegrating by crushing or breaking
    • 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
    • B01F33/86—Mixing heads comprising a driven stirrer
    • B01F33/862—Mixing heads comprising a driven stirrer the stirrer being provided with a surrounding stator

Definitions

  • the invention relates to a grinder according to the preamble of claim 1 and a mixer according to claim 10.
  • EP-A-0 200 003 discloses such a mill, which is designed as a pin mill and can be used in a mixer.
  • the rotor is provided with vanes which are arranged such that they can be driven in rotation within a stator.
  • the stator is provided with pins, between which and the radially outer ends of the blades shear gaps are formed.
  • a mixing turbine with a winged rotor which is surrounded by a guide ring serving as a stator at the same height.
  • the guide ring has window-like openings through which at least part of the material to be mixed is ejected radially.
  • the impeller and the guide ring are axially adjustable relative to one another.
  • a pin mill for mixers which has a rotor consisting essentially of blades which are arranged within an annular stator.
  • the rotor and the stator each have teeth distributed around the circumference, which mesh with one another when the rotor rotates.
  • the mills mentioned above are used in particular for the defined distribution of viscous, that is to say flowable, materials on mixed materials. At the same time, they serve to break up mixed agglomerates again.
  • the aforementioned purposes are satisfactorily achieved in numerous applications; for extremely sensitive mix, especially for Appropriate fluid distribution, however, these effects are not achieved satisfactorily.
  • a mixing device which has an impeller as a rotor and a stator.
  • the inner surface of the stator tapers in the shape of a truncated cone from the mixture inlet side to the mixture outlet side.
  • the stator is provided with passage slots above the rotor.
  • a mixing device for stirring and homogenizing liquids is known from DE-A-38 20 271. It has a rotor with vanes which is arranged in a stator which has an inner surface which tapers in the shape of a truncated cone.
  • the liquids to be mixed enter the stator from the larger diameter side of the inner surface and are discharged to the outside through a bore which cuts through the inner surface which tapers in the shape of a truncated cone.
  • the side of the stator assigned to the smaller diameter side of the inner surface is designed to be closed.
  • the invention has for its object to design a grinder of the generic type so that an excellent mixing and disagglomerating effect is achieved even under extreme conditions.
  • the frustoconical design of the friction surface ensures that the friction surface has an extension from the mixture inlet side to the mixture outlet side that is greater than the distance from the inlet side to the outlet side, thereby increasing the friction and thus mixing and deagglomerating effect .
  • the taper exerts a force on the material to be mixed, which counteracts the conveying of the material to be mixed from the inlet side to the outlet side, as a result of which the residence time of the material to be mixed in the region of the rotor and thus the mixing and deagglomeration effect is increased.
  • the liquid is added where it is immediately triturated with the mix, ie solid, so that agglomerates do not form in the first place, which then have to be ground again.
  • claim 2 lead to a particularly intensive mixing and deagglomeration effect, claim 3 indicating optimal cone opening angles for the friction surface.
  • Claim 4 specifies optimal ranges for the ratio of the rotor diameter to the axial extent of the rotor.
  • Claims 5 to 7 contain an extremely simple possibility of adjusting the gaps between the rotor and the friction surface resulting from the frustoconical configuration of the friction surface.
  • Claims 8 and 9 represent particularly advantageous and inventive measures for supplying liquid into the region of the frustoconical friction surface.
  • Claims 10 and 11 reflect the use of an attrition mill according to the invention in a mixer which can be operated continuously or discontinuously.
  • the largely conventional mixer shown in the drawing has a horizontal, stationary, cylindrical container 1, which is closed at the end and held at the same time by side walls 2, 3 acting as stands. On the side walls 2, 3, bearing blocks 4 are fastened, in which a shaft 5 of a mixer 6, which is arranged concentrically to the container 1, is mounted. It is driven by a drive motor 7 via a V-belt drive 8 and a gear 9.
  • the mixing mechanism 6 has mixing tools 10 which are designed in the form of blades and are held by means of mixing tool carriers 11 which are attached to the shaft 5 and project radially therefrom.
  • the mixing tools 10 themselves are located near the inside of the wall 12 of the container 1.
  • a so-called grinder 15 is installed, which is described in detail below.
  • a flange bearing 16 is attached, to which a motor 17 is flanged.
  • a clutch 18 connects the output shaft of the motor 17 to a drive shaft 19 of the grinder mill 15.
  • This drive shaft 19 passes through the wall 12.
  • the flange bearing 16 of the motor 17 is supported on a mill base plate 22 via bearing supports 20 and a flange ring 21.
  • the entire grinder 15 is attached to this mill base plate 22.
  • the mill base plate 22 is fastened in and in front of an opening 23 of the wall 12.
  • the grinder 15 has a stator 24 and a rotor 25 on its side of the base plate 22 facing away from the motor 17.
  • the stator 24 consists essentially of a stator ring 26 which has a cylindrical outer surface 27 and a frustoconical inner friction surface 28.
  • the side of the ring 26 facing the base plate 22 forms a mixed material inlet side 24a and the side facing away from the base plate 22 forms a mixed material outlet side 24b.
  • the inner friction surface 28 tapers from the entry side 24a to the exit side 24b of the grinder 15 at a half cone opening angle ⁇ of 20 ° to 45 ° and preferably 30 °.
  • the stator ring 26 is supported by two support rods 29 with respect to the base plate 22, which are arranged in a radial plane to the shaft 5, so that they do not represent an effective obstacle for mixing tools 10, as can be seen in particular from FIG. 1. They are therefore also in a common plane with the axis 30 of the drive shaft 19.
  • stator ring 26 is completely open in the direction of the axis 30, which is also the axis of the inner friction surface 28. Only two lugs 29a for the support rods protrude slightly into the open cross section.
  • the rotor 25 is designed like a propeller. It has a sleeve-shaped hub 32, which is connected in a rotationally fixed manner to the drive shaft 19 by means of a feather key 31 and to which vanes 33 with a radius c and an axial extent d, which extend approximately radially outward, are attached.
  • These wings 33 have the cross section of an elongated rectangle and are arranged radially to the axis 30. They are - as can be seen in particular from FIG. 4 - inclined or adjusted with respect to the axis 30 in such a way that - in relation to the direction of rotation 34 of the rotor 25 - the lower edge 35 of each wing 33 adjacent to the base plate 22 leads and that of the base plate 22 facing away from the upper edge 36.
  • the blades 33 exert on conveying material a conveying pulse directed in the direction of the axis 30 away from the base plate 22 towards the free end of the grinder 15, on which a conveying pulse directed radially to the axis 30 towards the friction surface 28 is superimposed.
  • the blades 33 are provided at their radially outer ends with shear edges 37 which run parallel to the inner friction surface 28 of the stator ring 26 and which limit the narrow shear gap 38 with respect to the inner friction surface 28, the width b of which is therefore constant over the length of the shear gap 38 .
  • width b 0.5 mm ⁇ b ⁇ 3.0 mm usually applies.
  • a sealing sleeve 39 is attached, against which seals 40, 41 bear, which in turn are supported in a through-bore 42 in the base plate 22.
  • a grease chamber 43 is formed, through which a grease connection 44 grease for lubricating the seals 40, 41 can be introduced.
  • a spacer sleeve 45 bears against the sealing sleeve 39, which is supported on its other side against the hub 32 of the rotor 25, 45 spacer disks 46 being arranged between the hub 32 and the spacer sleeve.
  • a cup-shaped fastening sleeve 47 bears against the hub 32 from the free end of the rotor 25, which is connected by means of a cap nut 48 to a threaded pin 49 of the drive shaft 19 and the hub 32 with the wings 33 in the direction of the axis 30 Base plate 22 firmly clamped against the spacer sleeve 45 with the spacer washers 46.
  • a liquid feed device 50 is assigned to the grinder 15, which has a tubular base body 51 which is inserted into a through-bore 52 in the base plate 22 running parallel to the axis 30.
  • a liquid supply connection 53 opens into this tubular base body 51 on the side of the base plate 22 facing away from the stator 24 and rotor 25.
  • a spray valve 54 opens out from the latter, which is a commercially available spray valve 54 which only opens when liquid under pressure is supplied via the supply connection 53, and this closes when no more liquid is supplied under pressure.
  • the distance e of the outlet opening 55 of the valve 54 from the adjacent edge 35 of the wings 33 is very small, namely as small as is structurally possible.
  • the distance e is therefore in the range between 0.5 and 3.0 mm.
  • the average distance f of the outlet opening 55 from the axis 30, ie the distance of the axis 56 of the valve 54 from the axis 30 of the drive shaft 19 is more than half of the maximum radius c of the rotor 25, the valve 54 with its Exit opening 55 is to be arranged radially as far as possible on the outside with respect to the axis 30, ie close to the inner friction surface 28 and thus the shear gaps 38. Since the valve 54 is arranged in a common plane with the support rods 29, the lugs 29a and the drive shaft 19 is a certain distance from the shear gaps 38 is unavoidable for design reasons.
  • the mechanism of action is as follows: The mixing material in the container 1 is circulated and mixed by the mixing tools 10 of the mixing unit 6 and also shifted parallel to the axis 57 of the shaft 5. It is brought into the space 58 between the base plate 22 and the rotor 25 and is fed to the rotor 25.
  • the mixed material is gripped by the vanes 33 and, on the one hand, conveyed in the manner described in the direction of the tapering inner friction surface 28 and at the same time flung radially outward to the axis 30 and fed to the shear gaps 38.
  • the inner friction surface 28 is at least largely closed radially to the axis 30 to the outside and because the inner friction surface 28 tapers in the axial conveying direction 59 of the vanes 33, the material to be mixed is stowed in the stator 24 and not merely in the direction 59 the grinder 15 flung through. Because it is simultaneously conveyed radially outwards, it is subjected to an intensive friction-shear stress in the shear gaps 38. At the same time, the liquid is introduced into the mix through the outlet opening 59 and immediately thereafter enters the shear gap 38. As a result, no agglomerates of the mix can form, not even with very fine mix on the one hand and highly viscous, strongly adhesive liquids on the other. The liquid is applied to the individual mix particles in a very finely divided form. So there is no macro-mixing of mix and liquid with simultaneous agglomerate formation, but a micro-mixing.
  • FIGS. 5 and 6 differs from that according to FIGS. 3 and 4 with regard to the construction of the rotor and stator only in constructive details, which are not important here. Identical parts are therefore provided with identical reference numerals as in FIGS. 3 and 4, while functionally identical but structurally slightly different parts are designated with the same reference number, but additionally with a prime, without requiring a new description in both cases.
  • the embodiment of FIGS. 5 and 6 differs from that of FIGS. 3 and 4 by the type of Hydration.
  • a feed housing 60 is attached to the mill base plate 22 'by means of screws 61, into which a liquid feed connection 53' opens radially.
  • liquid is supplied via a radial channel 62 in the sleeve 39 'and the drive shaft 19' to an axial channel 63 which runs concentrically to the axis 30 in the drive shaft 19 ' .
  • This axial channel 63 ends in the region of the rotor 25 'in radial outlet channels 64, which are arranged as bores adjacent to the lower edge 35 in the wings 33' and end with their outlet openings 55 'in the respective shear gap 38 or in the vicinity of the shear gap 38 .
  • the radial outlet channels 64 ′ can be designed as tubes separate from the vanes 33 ′, which also protrude into the vicinity of the inner friction surface 28 and release the liquid there in the direction of the inner friction surface 28.
  • the liquid is thus added in such a way that, together with the mixture, it must migrate over most of the inner friction surface 28 from its inlet side 24a as its wider area to its outlet side 24b as its narrower area.

Landscapes

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

Claims (11)

  1. Moulin à frottement, comportant :
    - une plaque de base de moulin (22, 22'),
    - un moteur (17) relié à la plaque de base (22, 22'),
    - un arbre menant (19, 19') accouplé au moteur (17) et susceptible d'être entraîné en rotation autour d'un axe (30),
    - un stator annulaire (24) relié à la plaque de base (22, 22'), présentant une surface intérieure (28) agencée concentriquement à l'axe (30) et ouvert à l'intérieur de la surface intérieure (28), qui possède un côté entrée pour la matière à malaxer (24a) orienté vers la plaque de base (22, 22') et un côté sortie pour la matière à malaxer (24b) écarté en direction de l'axe (30),
    - un rotor (25, 25') relié solidairement en rotation à l'arbre menant (19, 19'), pourvu de pales (33, 33') s'étendant jusqu'à proximité de la surface intérieure (28), et présentant des arêtes (37) qui sont réalisées de façon ouverte entre les pales (33, 33') et qui s'étendent aux extrémités radialement extérieures des pales (33, 33') et sensiblement parallèlement à la surface intérieure (28), et
    - un dispositif d'amenée de liquide (50, 50') dont l'ouverture de sortie de liquide (55, 55') est dirigée directement dans la région du stator,
    caractérisé en ce que la surface intérieure du stator (24) est réalisée sous forme d'une surface de frottement (28) qui va en se rétrécissant en forme de tronc de cône depuis le côté entrée pour la matière à malaxer (24a) jusqu'au côté sortie pour la matière à malaxer (24b), et en ce que l'ouverture de sortie de liquide (55, 55') du dispositif d'amenée de liquide (50, 50') est agencée directement au voisinage du côté entrée pour la matière à malaxer (24a) du stator (24).
  2. Moulin à frottement selon la revendication 1, caractérisé en ce que la surface de frottement (28) est réalisée de façon fermée.
  3. Moulin à frottement selon l'une ou l'autre des revendications 1 et 2, caractérisé en ce que le cône de la surface de frottement (28) est incliné d'un demi-angle d'ouverture (a) par rapport à l'axe (30), qui satisfait à la relation 20° ≤ a ≤ 45°.
  4. Moulin à frottement selon l'une quelconque des revendications 1 à 3, caractérisé en ce que le rotor (25, 25') présente un rayon maximum (c) et dans la région de ses arêtes extérieures radiales (37) une extension (d) en direction de l'axe (30), dont la relation d/c est telle que : 0,4 ≤ d/c ≤ 0,6.
  5. Moulin à frottement selon l'une quelconque des revendications 1 à 4, caractérisé en ce que les arêtes radialement extérieures (37) des pales (33, 33') délimitent chacune une fente de cisaillement (38) par rapport à la surface de frottement (28).
  6. Moulin à frottement selon la revendication 5, caractérisé en ce que la largeur (b) des fentes de cisaillement (38) est réglable.
  7. Moulin à frottement selon la revendication 6, caractérisé en ce que le rotor (25, 25') est réglable par rapport au stator (24) en direction de l'axe (30).
  8. Moulin à frottement selon la revendication 1, caractérisé en ce que le dispositif d'amenée de liquide (50) présente au moins une vanne de pulvérisation (54) agencée directement en avant du côté entrée pour la matière à malaxer (24b) du stator (24).
  9. Moulin à frottement selon la revendication 1, caractérisé en ce que le dispositif d'amenée de liquide (50') présente un canal (63) mené à travers l'arbre menant (19') et au moins un canal de sortie (64, 64') relié à celui-ci et s'étendant jusqu'à proximité de la surface de frottement (28).
  10. Malaxeur comportant un moulin à frottement selon l'une quelconque des revendications 1 à 9, un récipient cylindrique (1) et un dispositif de malaxage (6) agencé de manière susceptible d'être entraîné en rotation dans celui-ci, la plaque de base de moulin (22, 22') étant agencée dans une paroi (12) du récipient (1), le moteur (17) étant agencé à l'extérieur du récipient (1), et le rotor (25, 25') et le stator (24) étant agencés à l'intérieur du récipient (1).
  11. Malaxeur selon la revendication 10, dans lequel le dispositif de malaxage (6) présente un arbre (5) et des outils de malaxage (10) reliés à celui-ci et susceptibles d'être entraînés en périphérie à proximité de la paroi (12) du récipient, et dans lequel les outils de malaxage (10) peuvent être déplacés entre la paroi (12) du récipient (1) d'une part et le rotor (25, 25') et le stator (24) d'autre part.
EP94114511A 1993-09-28 1994-09-15 Moulin à frottement et malaxeur contenant ledit moulin Expired - Lifetime EP0645179B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4332977A DE4332977A1 (de) 1993-09-28 1993-09-28 Reib-Mühle und deren Verwendung
DE4332977 1993-09-28

Publications (2)

Publication Number Publication Date
EP0645179A1 EP0645179A1 (fr) 1995-03-29
EP0645179B1 true EP0645179B1 (fr) 1997-06-11

Family

ID=6498828

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94114511A Expired - Lifetime EP0645179B1 (fr) 1993-09-28 1994-09-15 Moulin à frottement et malaxeur contenant ledit moulin

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EP (1) EP0645179B1 (fr)
DE (2) DE4332977A1 (fr)

Families Citing this family (7)

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Publication number Priority date Publication date Assignee Title
DE19515992A1 (de) * 1995-05-02 1996-11-07 Lipp Mischtechnik Gmbh Vorrichtung zum Mahlen und Mischen von Massen
DE19602581A1 (de) * 1996-01-25 1997-07-31 Draiswerke Gmbh Verfahren und Mischer zum Herstellen von Papier-Streichffarbe
EP0836880A1 (fr) * 1996-10-16 1998-04-22 Clariant GmbH Mélangeur pour le traitement en continu de matériaux coulants
DE19901305A1 (de) 1999-01-15 2000-07-20 Starck H C Gmbh Co Kg Verfahren zur Herstellung von Hartmetallmischungen
DE10012072B4 (de) * 2000-03-14 2015-08-27 Hermann Linden Gmbh & Co. Kg Inline Mischer
CN115155422A (zh) * 2022-07-12 2022-10-11 蚌埠朋邦建筑劳务有限公司 一种对原料均匀搅拌的胶水加工用混合装置
BE1030812B1 (nl) * 2022-08-24 2024-03-26 Gb Foods Belgium N V Inrichting voor het voor het mengen van poedervormige deeltjes

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GB819029A (en) * 1957-10-29 1959-08-26 Uberto Pinto Improvements relating to mixing and emulsifying apparatus
GB915047A (en) * 1959-07-15 1963-01-09 Uberto Pinto Improvements in mixers
DE1188913B (de) * 1961-01-25 1965-03-11 Draiswerke Ges Mit Beschraenkt Ruehrwerksmuehle
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JPS5966361A (ja) * 1982-10-04 1984-04-14 栄船舶電機株式会社 デイスポ−ザ
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Publication number Publication date
EP0645179A1 (fr) 1995-03-29
DE4332977A1 (de) 1995-03-30
DE59403099D1 (de) 1997-07-17

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