EP0057426B1 - Device for the separation of grinding bodies and ground suspension in a wet grinding machine - Google Patents
Device for the separation of grinding bodies and ground suspension in a wet grinding machine Download PDFInfo
- Publication number
- EP0057426B1 EP0057426B1 EP82100572A EP82100572A EP0057426B1 EP 0057426 B1 EP0057426 B1 EP 0057426B1 EP 82100572 A EP82100572 A EP 82100572A EP 82100572 A EP82100572 A EP 82100572A EP 0057426 B1 EP0057426 B1 EP 0057426B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- sieve
- grinding
- wet
- separation
- ground suspension
- 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
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
- B07B1/46—Constructional details of screens in general; Cleaning or heating of screens
- B07B1/50—Cleaning
-
- 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 invention relates to a separating device for separating grinding media and ground suspension in a wet grinding machine, with a sieve arranged at the grist outlet of the wet grinding machine, the passage openings of which are designed with dimensions that block the passage of grinding media and the outlet surface of the sieve opposite one in the direction of the sieve movable plate is arranged and the plate on the side facing the screen is provided with elements for piercing the openings of the screen (DE-A-2922 122).
- a separating device in which fixed separating elements and movable separating elements are designed as straight strips or bars that are parallel to one another.
- the fixed dividers form a grate with parallel bars.
- the movable dividing members are periodically arranged to be movable back and forth in the direction of the grinding chamber. In practice, however, this separating device could not suffice.
- the invention is therefore based on the object of providing a separating device in which clogged sieves can be cleaned quickly and correctly during the ongoing operation of the wet comminution machine.
- This object is achieved according to the invention in that the elements can be moved through the sieve from time to time as required.
- the drawing shows a section through the grinding chamber and through the slotted screen of an agitator mill, as well as through the plate arranged opposite the slotted screen with the narrow, solid sheet metal strips incorporated therein.
- ground suspension and grinding media 2 in the interior of a grinding chamber 1 of an agitator mill.
- the ground suspension leaves the grinding chamber via the grinding material outlet opening 3.
- a flat sieve 4 designed as a slotted sieve is arranged at the grinding material outlet, the gap widths of which are approximately Va the grinding media diameter.
- the grinding media 2 and the suspension leaving the grinding chamber 1 are separated and at the same time the grinding media 2 are retained.
- Small particles that are about the same size as the gap widths of the flat screen and consist of abraded and broken grinding media and product particles can get stuck in the flat screen and thereby reduce the free screen area. This often has the consequence that the flat screen is clogged after only a few hours.
- a plate 5 which is movable in the direction of the flat screen is arranged opposite the exit surface thereof. Narrow, fixed sheet metal strips 6 are embedded in this plate, which are aligned with the openings 7 of the flat screen 4. In the event of any blockage, the metal strips are pushed through the openings 7 of the flat screen. As a result, the sieve-clogging particles are returned to the grinding chamber and the free sieve area is enlarged.
- the plate 5 is moved by means of a linkage 8.
- a seal 9 prevents suspensions from flowing outwards via the rod outlet opening. If the flat screen is clogged again, the process described above can be repeated periodically as required.
- the movable plate is made of metal and the sheet metal strips are connected to the plate by welding.
- the thickness of the metal strips is slightly less than the openings of the flat screen.
- the dimension "b" of the sheet metal strips is greater than the thickness "k" of the flat screen.
- the sieve can be designed as a perforated plate and the metal strips in the movable plate as mandrels.
- the advantages achieved with the invention consist in particular in that the cleaning of the slotted screen can be carried out quickly and correctly from the outside during operation. This eliminates the need for time-consuming cleaning work on the slotted screen and the service life of the wet shredder is significantly increased.
Landscapes
- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Crushing And Grinding (AREA)
Description
Die Erfindung betrifft eine Trennvorrichtung zum Trennen von Mahlkörpern und gemahlener Suspension in einer Nasszerkleinerungsmaschine, mit einem am Mahlgutauslass der Nasszerkleinerungsmaschine angeordneten Sieb, dessen Durchtrittsöffnungen mit Abmessungen ausgebildet sind, die den Durchtritt von Mahlkörpern sperren und der Austrittsfläche des Siebes gegenüberliegend eine in Richtung auf das Sieb bewegbare Platte angeordnet ist und die Platte auf der dem Sieb zugewandten Seite mit Elementen zum Durchstossen der Öffnungen des Siebes versehen ist (DE-A-2922 122).The invention relates to a separating device for separating grinding media and ground suspension in a wet grinding machine, with a sieve arranged at the grist outlet of the wet grinding machine, the passage openings of which are designed with dimensions that block the passage of grinding media and the outlet surface of the sieve opposite one in the direction of the sieve movable plate is arranged and the plate on the side facing the screen is provided with elements for piercing the openings of the screen (DE-A-2922 122).
Es ist beispielsweise aus der DAS 24 46 341 bekannt, zum Dispergieren von Pigmenten im wesentlichen mit Mahlkörpern gefüllte Nasszerkleinerungsmaschinen - z. B. Rührwerksmühlen, Kugelmühlen oder Rohrmühlen - zu verwenden. Dabei ist es notwendig nach dem Dispergieren die gemahlene Suspension von den Mahlkörpern zu trennen. Diese Trennung erfolgt mittels Spaltsieben oder Schlitzblechen, wobei die Löcher bzw. Schlitze kleiner als die Mahlkörper sind, so dass die gemahlene Suspension durch die Löcher bzw. Schlitze durchfliesst, während die Mahlkörper zurückgehalten werden. Da die Spaltweite etwa 1/3 des Durchmessers der verwendeten Mahlkörper beträgt, werden beim Einsatz von sehr kleinen Mahlkörpern mit einem Durchmesser von beispielsweise 0,8 mm entsprechend geringe Spaltbreiten von beispielsweise 0,25 mm notwendig. Bisher ist die Standzeit solcher Spaltsiebe sehr gering - oft nur wenige Stunden -, da sie schnell durch abgeriebene und gebrochene Mahlkörper sowie bei einigen Produkten durch grosse Partikel verstopfen. Dies wiederum bedeutet stets Öffnungen der Nasszerkleinerungsmaschine, Ausbau, Reinigung und Wiedereinbau des Spaltsiebes und Schliessen der Nasszerkleinerungsmaschine.It is known, for example, from DAS 24 46 341, for dispersing pigments essentially with wet grinding machines filled with grinding media - e.g. B. agitator mills, ball mills or tube mills - to use. After dispersing, it is necessary to separate the ground suspension from the grinding media. This separation takes place by means of slotted screens or slotted plates, the holes or slots being smaller than the grinding media, so that the ground suspension flows through the holes or slots while the grinding media are retained. As the gap width 1/3 is about the diameter of the grinding media used, are the use of very small grinding media with a diameter of for example 0.8 mm correspondingly small gap widths of, for example 0.25 mm necessary. So far, the service life of such slotted sieves has been very short - often only a few hours - because they quickly become clogged by abraded and broken grinding media and, in some products, by large particles. This in turn always means opening the wet shredding machine, removing, cleaning and reinstalling the slotted screen and closing the wet shredding machine.
Speziell in der Schrift DAS 29 22 122 ist eine Trennvorrichtung offenbart, bei der feststehende Trennglieder und bewegbare Trennglieder als gerade, zueinander parallele Leisten oder Stäbe ausgebildet sind. Hierbei bilden die feststehenden Trennglieder einen Rost mit parallelen Stäben. In den Zwischenräumen zwischen diesen Stäben sind die bewegbaren Trennglieder periodisch in Richtung zum Mahlraum hin und zurückbewegbar angeordnet. Diese Trennvorrichtung konnte in der Praxis jedoch nicht genügen.Specifically in document DAS 29 22 122, a separating device is disclosed in which fixed separating elements and movable separating elements are designed as straight strips or bars that are parallel to one another. The fixed dividers form a grate with parallel bars. In the spaces between these bars, the movable dividing members are periodically arranged to be movable back and forth in the direction of the grinding chamber. In practice, however, this separating device could not suffice.
Der Erfindung liegt daher die Aufgabe zugrunde, eine Trennvorrichtung zu schaffen, bei der verstopfte Siebe rasch und einwandfrei während des laufenden Betriebes der Nasszerkleinerungsmaschine gereinigt werden können.The invention is therefore based on the object of providing a separating device in which clogged sieves can be cleaned quickly and correctly during the ongoing operation of the wet comminution machine.
Diese Aufgabe wird erfindungsgemäss dadurch gelöst, dass die Elemente von Zeit zu Zeit nach Bedarf durch das Sieb hindurch bewegbar sind.This object is achieved according to the invention in that the elements can be moved through the sieve from time to time as required.
Ein Ausführungsbeispiel der Erfindung wird nachstehend anhand der Zeichnung näher erläutert.An embodiment of the invention is explained below with reference to the drawing.
Die Zeichnung zeigt einen Schnitt durch die Mahlkammer und durch das Spaltsieb einer Rührwerksmühle, sowie durch die dem Spaltsieb gegenüberliegend angeordnete Platte mit den darin eingebundenen schmalen, festen Blechstreifen.The drawing shows a section through the grinding chamber and through the slotted screen of an agitator mill, as well as through the plate arranged opposite the slotted screen with the narrow, solid sheet metal strips incorporated therein.
Gemäss Zeichnung befinden sich im Innenraum einer Mahlkammer 1 einer Rührwerksmühle gemahlene Suspension und Mahlkörper 2. Die gemahlene Suspension verlässt die Mahlkammer über die Mahlgutauslassöffnung 3. Am Mahlgutauslass ist ein als Spaltsieb ausgebildetes Flachsieb 4 angeordnet, dessen Spaltweiten etwa Va der Mahlkörperdurchmesser betragen. In diesem Flachsieb 4 werden die Mahlkörper 2 und die die Mahlkammer 1 verlassende Suspension getrennt und gleichzeitig die Mahlkörper 2 zurückgehalten. Kleine Partikel, die etwa gleichgross sind wie die Spaltweiten des Flachsiebs, und aus abgeriebenen und zerbrochenen Mahlkörpern sowie aus Produktpartikeln bestehen, können sich im Flachsieb festsetzen und dadurch die freie Siebfläche verringern. Häufig hat dies zur Folge, dass das Flachsieb schon nach wenigen Stunden verstopft ist. Um dieses Verstopfen des Flachsiebes zu verhindern, ist der Austrittsfläche desselben gegenüberliegend eine in Richtung auf das Flachsieb bewegbare Platte 5 angeordnet. In diese Platte sind schmale feste Blechstreifen 6 eingebunden, die den Öffnungen 7 des Flachsiebes 4 fluchtend gegenüberliegen. Bei einem eventuellen Verstopfen werden die Blechstreifen durch die Öffnungen 7 des Flachsiebes hindurchgestossen. Dadurch werden die siebverstopfenden Partikel in die Mahlkammer zurückgeführt und die freie Siebfläche wird vergrössert. Die Platte 5 wird mittels eines Gestänges 8 bewegt. Eine Dichtung 9 verhindert, dass Suspensionen über die Gestängeaustrittsöffnung nach aussen fliessen kann. Bei erneuter Verstopfung des Flachsiebes kann der oben geschilderte Arbeitsgang je nach Bedarf periodisch wiederholt werden. In dem erläuterten Ausführungsbeispiel ist die bewegliche Platte aus Metall gefertigt und die Blechstreifen sind durch Schweissung mit der Platte verbunden. Die Stärke der Blechstreifen ist geringfügig kleiner als die Öffnungen des Flachsiebes. Das Mass «b» der Blechstreifen ist grösser als die Stärke «k» des Flachsiebes. Alternativ kann das Sieb als Lochblech und die Blechstreifen in der beweglichen Platte als Dorne ausgeführt werden.According to the drawing, there are ground suspension and grinding media 2 in the interior of a grinding chamber 1 of an agitator mill. The ground suspension leaves the grinding chamber via the grinding material outlet opening 3. A flat sieve 4 designed as a slotted sieve is arranged at the grinding material outlet, the gap widths of which are approximately Va the grinding media diameter. In this flat sieve 4 the grinding media 2 and the suspension leaving the grinding chamber 1 are separated and at the same time the grinding media 2 are retained. Small particles that are about the same size as the gap widths of the flat screen and consist of abraded and broken grinding media and product particles can get stuck in the flat screen and thereby reduce the free screen area. This often has the consequence that the flat screen is clogged after only a few hours. In order to prevent this clogging of the flat screen, a plate 5 which is movable in the direction of the flat screen is arranged opposite the exit surface thereof. Narrow, fixed sheet metal strips 6 are embedded in this plate, which are aligned with the
Die mit der Erfindung erzielten Vorteile bestehen insbesondere darin, dass die Reinigung des Spaltsiebes von aussen rasch und einwandfrei während des laufenden Betriebes erfolgen kann. Dadurch entfallen aufwendige Reinigungsarbeiten an dem Spaltsieb und die Standzeiten der Nasszerkleinerungsmaschine werden deutlich erhöht.The advantages achieved with the invention consist in particular in that the cleaning of the slotted screen can be carried out quickly and correctly from the outside during operation. This eliminates the need for time-consuming cleaning work on the slotted screen and the service life of the wet shredder is significantly increased.
Claims (1)
- A device for separating grinding medium from milled suspension in a wet comminuting machine, comprising a sieve (4) which is located at the outlet (3) of the machine for the milled suspension and has orifices (7) of such dimensions that they prevent the passage of grinding medium, as well as a plate (5) which can be moved towards the sieve and is located opposite the exit surface of the sieve and carries, on the side facing the sieve, elements (6) for unblocking the orifices in the sieve, wherein the elements can be advanced through the sieve from time to time, as required.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3103662 | 1981-02-04 | ||
| DE3103662A DE3103662C2 (en) | 1981-02-04 | 1981-02-04 | Separating device for separating grinding media and ground suspension in a wet grinding machine |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0057426A2 EP0057426A2 (en) | 1982-08-11 |
| EP0057426A3 EP0057426A3 (en) | 1984-05-16 |
| EP0057426B1 true EP0057426B1 (en) | 1986-06-04 |
Family
ID=6123969
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP82100572A Expired EP0057426B1 (en) | 1981-02-04 | 1982-01-28 | Device for the separation of grinding bodies and ground suspension in a wet grinding machine |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US4421642A (en) |
| EP (1) | EP0057426B1 (en) |
| CA (1) | CA1175789A (en) |
| DE (2) | DE3103662C2 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4637557A (en) * | 1985-07-15 | 1987-01-20 | Vitunac Edward A | Device for cleaning the sizing screen of a material reduction apparatus |
| US4702826A (en) * | 1986-02-03 | 1987-10-27 | Rotex, Inc. | Screen cleaner for particle size analyzer |
| DE4122680C2 (en) * | 1991-07-09 | 1994-03-31 | Draiswerke Gmbh | Agitator mill |
| US5893973A (en) * | 1997-08-25 | 1999-04-13 | Antoun; Gregory S. | High efficiency backflush system for a filter |
| CN104190499B (en) * | 2014-08-20 | 2017-05-03 | 山东巴顿化肥有限公司 | Crushing device for treating caking of chemical fertilizer raw materials |
| BE1024079B1 (en) * | 2015-09-07 | 2017-11-13 | Pharma Technology S.A. | DEVICE FOR SEPARATING PARTICLE CASSONS FROM SAID PARTICLES |
| CN114985091B (en) * | 2022-04-22 | 2023-07-14 | 安池(山东)动物营养研究院有限公司 | Feed raw material crushing and screening device |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE78027C (en) * | L. RÖSSLER u. H. REINHARD, München | Cleaning device for exchangeable screens | ||
| US65504A (en) * | 1867-06-04 | Improved ice-ckujheh | ||
| US1279335A (en) * | 1918-01-19 | 1918-09-17 | Harry W Hardinge | Conical mill. |
| GB1154196A (en) * | 1966-07-27 | 1969-06-04 | Albert Wehner | Screening Machines |
| US3567032A (en) * | 1968-06-14 | 1971-03-02 | Monogram Ind Inc | Filter and pump for a recirculating sanitary system |
| CH565579A5 (en) * | 1973-03-22 | 1975-08-29 | Ziolkowski Roman | |
| CH564373A5 (en) * | 1973-09-28 | 1975-07-31 | Bicik Vladislav | |
| DE2922122A1 (en) * | 1979-05-31 | 1980-12-04 | Netzsch Maschinenfabrik | Stirring mill grinder body separation equipment - comprises straight parallel fixed and movable bars or plates |
-
1981
- 1981-02-04 DE DE3103662A patent/DE3103662C2/en not_active Expired
-
1982
- 1982-01-18 CA CA000394400A patent/CA1175789A/en not_active Expired
- 1982-01-28 US US06/343,761 patent/US4421642A/en not_active Expired - Fee Related
- 1982-01-28 DE DE8282100572T patent/DE3271489D1/en not_active Expired
- 1982-01-28 EP EP82100572A patent/EP0057426B1/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| EP0057426A2 (en) | 1982-08-11 |
| EP0057426A3 (en) | 1984-05-16 |
| US4421642A (en) | 1983-12-20 |
| DE3103662A1 (en) | 1982-08-12 |
| DE3271489D1 (en) | 1986-07-10 |
| CA1175789A (en) | 1984-10-09 |
| DE3103662C2 (en) | 1983-03-31 |
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