EP0206207A2 - Broyeur agitateur - Google Patents

Broyeur agitateur Download PDF

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Publication number
EP0206207A2
EP0206207A2 EP86108202A EP86108202A EP0206207A2 EP 0206207 A2 EP0206207 A2 EP 0206207A2 EP 86108202 A EP86108202 A EP 86108202A EP 86108202 A EP86108202 A EP 86108202A EP 0206207 A2 EP0206207 A2 EP 0206207A2
Authority
EP
European Patent Office
Prior art keywords
grinding
cavity
agitator
outlet openings
outlet
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
EP86108202A
Other languages
German (de)
English (en)
Other versions
EP0206207B2 (fr
EP0206207A3 (en
EP0206207B1 (fr
Inventor
Giacomo Dr. Canepa
Klaus Ott
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.)
Erich Netzsch GmbH and Co Holding KG
Original Assignee
Erich Netzsch GmbH and Co Holding KG
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
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=6273487&utm_source=***_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0206207(A2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Priority claimed from DE3521668A external-priority patent/DE3521668C3/de
Application filed by Erich Netzsch GmbH and Co Holding KG filed Critical Erich Netzsch GmbH and Co Holding KG
Publication of EP0206207A2 publication Critical patent/EP0206207A2/fr
Publication of EP0206207A3 publication Critical patent/EP0206207A3/de
Application granted granted Critical
Publication of EP0206207B1 publication Critical patent/EP0206207B1/fr
Publication of EP0206207B2 publication Critical patent/EP0206207B2/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
    • B02C17/16—Mills in which a fixed container houses stirring means tumbling the charge
    • B02C17/161—Arrangements for separating milling media and ground material

Definitions

  • the separating device is arranged in a protected manner within the cavity which is open at the end in the end section of the agitator shaft, so that grinding media activated directly by the agitator shaft have hardly any possibility of against the separating device bounce. Nevertheless, the risk of the separating device becoming clogged is avoided; the grinding media with the regrind axially through the open end of the agitator shaft into its cavity flow past the separating device without accumulating there, since they are thrown off through the outlet openings due to the rotation of the agitator shaft.
  • the present invention has for its object to make the regrind flow through the cavity at the inner shaft end even more intense, especially by further improving the flow of the grinding media out of this cavity.
  • the object is achieved in one embodiment of the invention in that at least some of the outlet openings are arranged tangentially to the separating device and, in relation to the operating direction of rotation of the agitator shaft, is directed backwards. In this way, it is ensured that the grinding media leave the cavity at the inner shaft end particularly quickly and create space for regrind flowing in on the end face.
  • This embodiment can be further developed in that the end section of the agitator shaft with the tangential outlet openings has an elliptical or polygonal cross-sectional shape.
  • tangential outlet openings can be accommodated particularly well; in addition, the cross-sectional shape of the end section of the agitator shaft deviating from a circular cross section has the advantage that around this end section within the grinding chamber there is always free space for the grinding bodies flowing out of the cavity.
  • tangential outlet openings are formed between rows of axially parallel rods which are arranged in cross section through the end section of the agitator shaft in the form of Archimedean spirals.
  • the tangential outlet openings can be delimited by projections which extend tangentially inwards up to the vicinity of the separating device.
  • the outlet openings are separated from one another by webs to which stirring elements are attached on the outside.
  • This embodiment can be developed according to the present invention in that the stirring elements around the outlet openings form an at least approximately gap-free deflecting area in which grinding media are prevented from penetrating into the cavity. In this way, too, the outflow of the grinding media from the cavity is facilitated and thereby the axial inflow of regrind into the cavity is also promoted.
  • the stirring elements attached to the webs can be radial rods. According to the invention, these stirring elements are expediently offset from one another along the outlet openings. In this way, a substantially gap-free deflection area can be formed even with relatively slim radial rods.
  • EP-A-146 852 there is also the possibility that the separating device in the form of a sieve jacket is arranged at least approximately coaxially with the agitator shaft on a tube which extends through part of the grinding chamber from the inner shaft end into the cavity.
  • This embodiment of EP-A-146 852 can be further developed in accordance with the present invention be that the separator is clamped axially between the tube and a coolable insert body.
  • the horizontal agitator mill shown in FIGS. 1 and 2 has a box-shaped frame 10, on which a substantially cylindrical grinding container 12 and axially next to this a bearing housing 14 are fastened.
  • the frame 10 contains a drive motor, not shown, and is connected to the bearing housing 14 by a gear housing 16, in which a gear, also not shown, with an adjustable transmission ratio is arranged.
  • the grinding container 12 contains a circular cylindrical grinding chamber 18 in which an agitator 20 is arranged.
  • the agitator 20 consists essentially of an agitator shaft 22 which is mounted in the bearing housing 14 and extends coaxially with the grinding container 12 through almost the entire grinding chamber 18, and a number of rod-shaped stirring elements 24 which are attached to the agitator shaft 22 at equal axial intervals and protrude into spaces between counter-bars 26 attached to the grinding container 12.
  • a grinding material inlet 28 through which a suspension or slurry of grinding material and liquid is continuously pumped into the grinding chamber 18 during operation.
  • a grinding material outlet 30 is arranged, through which the finished grinding material is continuously pumped out.
  • the regrind outlet has a tube 32 on which a flange 34 is formed. The flange 34 is screwed to a cover 36 which forms the end face of the grinding container 12 facing away from the gear housing 16.
  • the pipe 32 extends - coaxially with the agitator shaft 22 in the example shown - through the cover 36 and the adjoining area of the grinding chamber 18 to an end section 38 of the agitator shaft 22.
  • the end section 38 is detachably screwed to the main part of the agitator shaft 22 and points a cavity 40 open at the end or end, in which a separating device 42 is arranged.
  • the separating device 42 is formed by a cylindrical sieve cartridge, which extends immediately after the tube 32, coaxially with the stirring shaft 22, over the greater part of the length of the cavity 40 and is closed off by a solid, plate-shaped end wall 44.
  • slit-shaped, axially parallel outlet openings 46 are incorporated, each having an annular sector-shaped cross-section and extending over the greater part of the length of the cavity 40, so that the separating device 42 of almost the entire length thereof Outlet openings 46 is enclosed.
  • the outlet openings 46 are apart separated by axially parallel webs 48 from a cross-section in the form of an annular sector, so that the end section 38 as a whole resembles a cylindrical cage which is open on its end face.
  • a rod-shaped stirring element 24 is fastened in the middle of each second web 48; axially offset against this stirring element, two stirring elements 24 are fastened to the remaining webs 48.
  • the stirring elements 24, which are attached to the webs 48 as a whole, thus form a deflecting area around the outlet openings 46 that is at least approximately complete in the axial direction.
  • the grinding chamber 18 contains a mixture of grinding media 50 and grinding stock 52, which is activated during operation by rotating the agitator shaft 22 at a speed which is customary in agitator mills in the order of, for example, 200 to 3000 revolutions per minute, depending on the nature of the grinding stock and Diameter of the agitator shaft and the grinding media.
  • a vacuum is generated by a pump, not shown, which allows the grinding media 50 and regrind 52 to flow from the grinding chamber 18 into the cavity 40.
  • the finished regrind 52 passes through the separating device 42 into the tube 32, while the grinding media 50 are retained and flow back through the outlet openings 46 into the grinding chamber 18. This backflow is promoted by the centrifugal forces resulting from the action of the webs 48 and the stirring elements 24 attached to them on the grinding media 50.
  • the end wall 44 is part of a closed hollow insert body 78 which is connected to a coolant circuit via an inlet line 80 and an outlet line 82 and is clamped to the flange 34 by a tie rod 84, as a result of which the formed as a sieve cartridge separator 42 is interchangeably clamped between the end wall 44 and the opposite end of the tube 32.
  • FIGS. 3 and 4 differs from that according to FIG. 2 in that the cage-like end section 38 of the stirring shaft 22 is formed by two rows of slender cylindrical rods 86.
  • Each of these rows of rods 86 is arranged in the form of a half Archimedean spiral, as shown in FIG. 4, so that the rods are particularly endeavored to hurl grinding media outwards when the agitator shaft 22 is in the direction of rotation, in the sense of arrows 88 in FIG 4 turns.
  • the rods 86 are fastened on the one hand to the main part of the agitator shaft 22 and on the other hand to a flat ring 90 which encloses the axially inner end of the tube 32.
  • a flat ring 90 which encloses the axially inner end of the tube 32.
  • an annular gap which is wide enough to allow the grinding media 50 together with the grinding stock 52 to enter the cavity 40 remains free.
  • the attachment of the rods 86 to the main part of the agitator shaft 22 and / or to the ring 90 can be releasable; in this case, the rods can be enclosed by an exchangeable wear sleeve.
  • FIGS. 6, 7 and 9 The same applies to the embodiments shown in FIGS. 6, 7 and 9.
  • the end section 38 of the agitator shaft 22 is annular in accordance with FIGS. 6 and 9, but in the form of an ellipse in FIG. 7.
  • the embodiment according to FIG. 9 has the special feature that the tangential outlet openings 46 are delimited by projections 92 which extend approximately tangentially to the separating device 42 designed as a sieve cartridge without fully reaching it.
  • stirring elements 94 in the form of desk-like projections are arranged on the outside of the end section 38, which, like the stirring elements 24 arranged on the end section 38 according to FIG. 2, create free spaces in the region radially outside the outlet openings 46 when rotated in the direction of arrow 88, which are ready to receive the grinding media 50 emerging from the cavity 40.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
EP19860108202 1985-06-18 1986-06-16 Broyeur agitateur Expired - Lifetime EP0206207B2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3521668A DE3521668C3 (de) 1983-12-16 1985-06-18 Rührwerksmühle
DE3521668 1985-06-18

Publications (4)

Publication Number Publication Date
EP0206207A2 true EP0206207A2 (fr) 1986-12-30
EP0206207A3 EP0206207A3 (en) 1987-11-25
EP0206207B1 EP0206207B1 (fr) 1989-05-24
EP0206207B2 EP0206207B2 (fr) 1994-03-02

Family

ID=6273487

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19860108202 Expired - Lifetime EP0206207B2 (fr) 1985-06-18 1986-06-16 Broyeur agitateur

Country Status (2)

Country Link
EP (1) EP0206207B2 (fr)
DE (1) DE3663454D1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3727863C1 (de) * 1987-08-20 1989-03-02 Netzsch Erich Holding Ruehrwerksmuehle mit Zufuehrrohr fuer Mahlkoerper
EP0322623A2 (fr) * 1987-12-28 1989-07-05 Inoue Seisakusho (Mfg) Co., Ltd. Appareil de dispersion et de broyage
DE4002613A1 (de) * 1990-01-30 1991-08-01 Draiswerke Gmbh Ruehrwerksmuehle
EP0448100A1 (fr) * 1990-03-21 1991-09-25 Erich Netzsch GmbH & Co. Holding KG Broyeur-mélangeur
EP1977832A3 (fr) * 2007-04-06 2012-10-17 Ashizawa Finetech Ltd Broyeur agitateur
EP4349488A1 (fr) * 2022-10-07 2024-04-10 NETZSCH-Feinmahltechnik GmbH Broyeur agitateur

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4029139A1 (de) * 1990-09-13 1992-03-19 Netzsch Erich Holding Ruehrwerksmuehle
DE102022134099A1 (de) * 2022-12-20 2024-06-20 Netzsch-Feinmahltechnik Gmbh Rührwerksmühle

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0146852B1 (fr) * 1983-12-16 1987-03-04 Gebrüder Netzsch Maschinenfabrik GmbH & Co Broyeur agitateur

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0146852B1 (fr) * 1983-12-16 1987-03-04 Gebrüder Netzsch Maschinenfabrik GmbH & Co Broyeur agitateur

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3727863C1 (de) * 1987-08-20 1989-03-02 Netzsch Erich Holding Ruehrwerksmuehle mit Zufuehrrohr fuer Mahlkoerper
EP0322623A2 (fr) * 1987-12-28 1989-07-05 Inoue Seisakusho (Mfg) Co., Ltd. Appareil de dispersion et de broyage
EP0322623B1 (fr) * 1987-12-28 1995-03-15 Inoue Seisakusho (Mfg) Co., Ltd. Appareil de dispersion et de broyage
DE4002613A1 (de) * 1990-01-30 1991-08-01 Draiswerke Gmbh Ruehrwerksmuehle
EP0439826B1 (fr) * 1990-01-30 1993-12-15 Draiswerke GmbH Mélangeur-broyeur
EP0448100A1 (fr) * 1990-03-21 1991-09-25 Erich Netzsch GmbH & Co. Holding KG Broyeur-mélangeur
EP1977832A3 (fr) * 2007-04-06 2012-10-17 Ashizawa Finetech Ltd Broyeur agitateur
EP4349488A1 (fr) * 2022-10-07 2024-04-10 NETZSCH-Feinmahltechnik GmbH Broyeur agitateur

Also Published As

Publication number Publication date
EP0206207B2 (fr) 1994-03-02
EP0206207A3 (en) 1987-11-25
DE3663454D1 (en) 1989-06-29
EP0206207B1 (fr) 1989-05-24

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