US3780957A - Screen arrangement for stirring mills - Google Patents

Screen arrangement for stirring mills Download PDF

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Publication number
US3780957A
US3780957A US00163672A US3780957DA US3780957A US 3780957 A US3780957 A US 3780957A US 00163672 A US00163672 A US 00163672A US 3780957D A US3780957D A US 3780957DA US 3780957 A US3780957 A US 3780957A
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US
United States
Prior art keywords
screen
stirring
stirring mill
mill
cover plate
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
US00163672A
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English (en)
Inventor
K Wilhelm
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
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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
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Publication of US3780957A publication Critical patent/US3780957A/en
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    • 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

  • ABSTRACT A closed stirring mill for processing solid materials in liquids having a stirrer and a plurality of spherical grinding elements and a screen arrangement at the ground material outlet to hold back the grinding elements wherein the screen arrangement consists of one or more screen cartridges attached to the jacket wall or the cover plate of the mill.
  • the invention concerns a closed stirring mill, intendedfor crushingand distribution of solids in liquids.
  • the mill housing generally mounted in an upright position, is provided with a high-speed stirrer, with the material to be ground suspended in a liquid passing continuously through the mill housing, from bottom to top in a standing stirring mill.
  • This process takes place in the presence of spherical grinding elements, which serve to crushand pulverize the material to be ground.
  • a flow which disperses the materials to be ground within the mill is produced by thestirrer together with the numerous grinding elements.
  • spherical grinding elements which have only a very small diameter (e.g., a diameter in the range from 0.2 to 3 mm) are used in such stirring mills.
  • the grinding elements in the dispersed material to be ground must be separated from this material at the outlet of the stirring mill. This process poses considerable difficulties, especially when the grinding elements in the stirring mill are of small diameter.
  • a double-walled disk screen element can be mounted at the outlet of the stirring mill, i.e., at the end of the mill housing at which the stirring mill is not driven through the screen element.
  • the invention is designed particularly to overcome these difficulties.
  • a screen arrangement is proposed which insures convenient exchange and replacement, while providing a sufficiently large screen area.
  • the invention places particular emphasis on the fact that the screen surface can be exposed on all sides to the flow of the dispersed material being ground.
  • the invention consists primarily of the fact that the screen arrangement consists of one or more tubular screen cartridges, which extend into the internal space of the mill housing and have their open ends (directed outward) connected to the material outlet.
  • the arrangement can be designed advantageously so that one or more screen cartridges can be installed at the outlet of the mill housing, in suitable openings in the jacket wall of the mill housing.
  • a screen cartridge can be mounted laterally on each side of the drive shaft for the stirrer. It is also advantageous to provide a screen cartridge perpendicular with the drive shaft of the stirrer, which has its free end mounted closely adjacent to the drive shaft of the stirrer.
  • the arrangement according to the invention means that no dead spaces remain within the mill housing, which are not affected by the flow of material being ground to some extent.
  • the accumulation of residue in such dead spaces has a particularly unfavorable effect on the quality of the product. Avoiding these dead spaces also means that any residue that may remain can be washed away when the machine is cleaned with a detergent, because the detergent is able to capture all residues from the disperse material being ground as it flows into the entire internal space.
  • the screen cartridges can be fastened in the cover plate by means of a rim flange using a screw cap, with the cavity in this screw cap being connected by a radial channel to a cylindrical collecting chamber mounted around the shaft bearing and hence connected with the outlet channel.
  • the entire screen surface of the screen cartridges is exposed in a particularly favorable manner to the flow of material being ground.
  • the screw caps may be conveniently removed from the cover plate. The removal of the screen cartridges and the possible replacement of one screen cartridge by a new screen cartridge is quick and convenient to accomplish, without having to remove the cover plate itself from the closed stirring mill.
  • the drive as well as the main bearing for the type of stirring mill in question is mounted above the cover plate.
  • an elastic rubber ring may be interposed between the cover plate and the mill housing of the stirring mill.
  • the cover plate does not have a rigid and unchanging position within the mill housing with the stirring mechanism as well as the screen cartridges.
  • the stirring mechanism and the screen cartridges as well
  • This elastic mounting of the stirring mechanism and the screen cartridges on the mill housing removes the load on the shaft seal and insures that no dead spaces remain in the mill housing, in which residue from the material being ground could remain and not be removed by a flow of detergent.
  • FIG. 1 A stirring mill in schematic representation.
  • FIG. 2 The upper end of a stirring mill, with screen assembly in lengthwise cross section.
  • FIG. 3 A section through the stirring mill along line Ill-III in FIG. 2, and
  • FIG. 4 A further design of the screen arrangement at the upper end of the stirring mill.
  • An electric drive motor 102 is mounted in the vertical position by its flange 103 to an arm 100 on a machine stand 101.
  • the mill housing 1 of a stirring mill is mounted vertically below the drive motor 102, with a stirring shaft 2 driven at high speed by drive motor 102 extending into said stirring mill.
  • the stirring shaft is overhung in the bearing housing 104 in the vicinity of the motor, and is therefore no longer supported at its other end, located in mill housing 1.
  • Stirring shaft 2 carries a number of stirring disks 3, fastened to the stirring shaft by screws 3a.
  • the vertical stirring mill is closed at its upper end.
  • the stirring shaft 3 is mounted in said gasket housing 7 by means of ball bearings 7b (FIG. 4).
  • the gasket housing 7 is itself elastically mounted, by means of elastic annular disk 4, which is bolted to mill housing 1 with the aid of rings 5 and 6 on one side by means of another ring 5a, and on the other side to the gasket housing 7 for stirring shaft 2.
  • the elastic annular disk 4 insures thst stirring shaft 2, which is mounted only at its upper end in bearing housing 104, can execute lateral oscillating movements together with its stirring disks 3 to a certain slight extent.
  • the gasket housing 7 is prevented from turning by means of one or more locking pins 6a, firmly mounted in a ring 6 and loosely mounted in another ring 5.
  • the material to be ground is fed into the mill housing 1 at the lower end through an inlet stub 105.
  • the internal space of the mill housing is filled 50 to 70 percent with small, spherical grinding elements, which can have (for example) a diameter of 0.2 to 3 mm.
  • a disperse flow of material being ground develops in the mill housing due to the introduction of the material to be ground, said flow moving from bottom to top.
  • the ground material leaves the stirring mill through an outlet stub 8, which is screwed on to a corresponding flange 8b of mill housing 1, a seal 80 being provided between them.
  • FIGS. 2 and 3 three tubular screen cartridges, 9, l0 and 11 are connected to this outlet stub.
  • These screen cartridges are introduced laterally at the upper end of mill housing 1 through the jacket wall of mill housing 1.
  • These screen cartridges are located in housings 12, 13, 14, which are placed in corresponding openings in the jacket wall of mill housing 1 and have their flanges a against the upper edges of housings l2, 13, 14 in this case with a ring seal 10b mounted between. They are held in this position by the connecting flange 8b of outlet stub 8.
  • Screen cartridges 9, l0, 11 can be removed and replaced again simply by unscrewing outlet stub 8, without having to remove the cover plate of the stirring mill.
  • Screen cartridges 9 and 11 are installed laterally with respect to the stirring shaft 2, while screen cartridge 10 is shorter and is mounted close to stirring shaft 2.
  • the screen cartridges are made of a fine-mesh braid or punched thin sheet. They have bottoms made of the same material or of sheet.
  • two screen cartridges 15 and 16 with top edge flanges 17 and 18, each of which is mounted firmly against a corresponding shoulder 17a, 18a in cover plate 21, are mounted firmly in cover plate 21 by means of screw caps 19 and 20.
  • Each of the screw caps 19 and 20 is screwed into cover plate 21 by means of a four-cornered shaft 22, 23.
  • Screw caps 19 and 20 are each provided with a cavity 24, 25. These cavities 24 and 25 are connected by radial channels 26, 27, 29 in screw caps 19 and 20 to a collecting chamber 30 in cover plate 21 which has a cylindrical shape and surrounds gasket housing 7, said collecting chamber emptying into an outlet stub 32.
  • cover plate 21 is connected to mill housing 1 by a flexible rubber ring 33.
  • a closed stirring mill for processing solid materials in liquids with a vertical mill housing having ajacket wall and a cover plate with an aperture therein, and a stirrer driven by a drive shaft, said drive shaft extending through said aperture, and said mill housing having material inlet and outlet openings thereon and spherical grinding elements therein, wherein a disperse flow of ground material is produced in the presence of said spherical grinding elements by high-speed stirring and in which a screen arrangement is provided at said material outlet to hold back the said grinding elements, the improvement wherein said screen arrangement comprises at least one cartridge having a cylindrical screen and having an open end, said cartridge extending into the internal space of said mill housing and being connected at the open end thereof to said material outlet wherein substantially the entire surface of the cartridge is exposed to the flow of the material being ground.
  • a stirring mill according to claim 5 further including a collecting chamber linked to said material outlet to carry off the disperse ground material from the stirring mill, wherein said screen cartridges are connected to said collecting chamber.
  • a stirring mill according to claim 6, wherein said screen cartridges further include edge flanges at the open end thereof, and further including screw caps for fastening said edge flanges to said cover plate, wherein said screw caps have hollow spaces therein connected by way of radial channels to said collecting chamber.
  • a stirring mill according to claim 1 further including a drive means attached to said drive shaft and located above said cover plate for driving said drive shaft, the improvement further comprising a flexible rubber ring between said cover plate and said jacket wall.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)
US00163672A 1970-07-28 1971-07-19 Screen arrangement for stirring mills Expired - Lifetime US3780957A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2037258A DE2037258C3 (de) 1970-07-28 1970-07-28 Geschlossene Rührwerksmühle

Publications (1)

Publication Number Publication Date
US3780957A true US3780957A (en) 1973-12-25

Family

ID=5778054

Family Applications (1)

Application Number Title Priority Date Filing Date
US00163672A Expired - Lifetime US3780957A (en) 1970-07-28 1971-07-19 Screen arrangement for stirring mills

Country Status (8)

Country Link
US (1) US3780957A (enrdf_load_stackoverflow)
AT (1) AT308505B (enrdf_load_stackoverflow)
BE (1) BE769325A (enrdf_load_stackoverflow)
CH (1) CH526339A (enrdf_load_stackoverflow)
DE (1) DE2037258C3 (enrdf_load_stackoverflow)
DK (1) DK145713C (enrdf_load_stackoverflow)
FR (1) FR2098077A5 (enrdf_load_stackoverflow)
GB (1) GB1343361A (enrdf_load_stackoverflow)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4441658A (en) * 1981-11-16 1984-04-10 Morehouse Industries, Inc. Sandmill screen mounting assembly
DE3536857A1 (de) * 1984-11-16 1986-05-22 Draiswerke Gmbh, 6800 Mannheim Geschlossene ruehrwerksmuehle mit siebpatronen
US4620673A (en) * 1983-12-16 1986-11-04 Gebruder Netzsch Maschinenfabrik Gmbh & Co. Agitator mill
US4742966A (en) * 1985-06-21 1988-05-10 Morehouse Industries, Inc. Media mill screen assembly
US5335867A (en) * 1991-07-09 1994-08-09 Draiswerke Gmbh Agitator mill
US5758833A (en) * 1996-07-26 1998-06-02 Draiswerke Gmbh Agitator mill
EP0982074A1 (de) 1998-08-28 2000-03-01 DRAISWERKE GmbH Rührwerksmühle

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD153331A1 (de) * 1980-10-02 1982-01-06 Wolfgang Haentzschel Ruehrwerkskugelmuehle
DD256460A1 (de) * 1986-12-30 1988-05-11 Nagema Veb K Mahlkoerperabtrennsystem in ruehrwerkskugelmuehlen
DE3927076A1 (de) * 1988-08-26 1990-03-08 Netzsch Erich Holding Ruehrwerksmuehle
DE4216939C2 (de) * 1992-05-22 1995-01-26 Kneisl Wendelin Dipl Ing Th Rührwerksmühle mit dynamischer Mahlkörperabtrennung
DE19510807C2 (de) * 1994-03-24 1997-04-17 Netzsch Erich Holding Rührwerksmühle

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4441658A (en) * 1981-11-16 1984-04-10 Morehouse Industries, Inc. Sandmill screen mounting assembly
US4620673A (en) * 1983-12-16 1986-11-04 Gebruder Netzsch Maschinenfabrik Gmbh & Co. Agitator mill
DE3536857A1 (de) * 1984-11-16 1986-05-22 Draiswerke Gmbh, 6800 Mannheim Geschlossene ruehrwerksmuehle mit siebpatronen
US4739936A (en) * 1984-11-16 1988-04-26 Draiswerke Gmbh Closed agitator mill with screen cartridges
DE3536857C2 (de) * 1984-11-16 1994-06-09 Draiswerke Gmbh Geschlossene Rührwerksmühle mit Siebpatronen
US4742966A (en) * 1985-06-21 1988-05-10 Morehouse Industries, Inc. Media mill screen assembly
US5335867A (en) * 1991-07-09 1994-08-09 Draiswerke Gmbh Agitator mill
US5758833A (en) * 1996-07-26 1998-06-02 Draiswerke Gmbh Agitator mill
EP0982074A1 (de) 1998-08-28 2000-03-01 DRAISWERKE GmbH Rührwerksmühle

Also Published As

Publication number Publication date
DE2037258A1 (de) 1972-02-03
FR2098077A5 (enrdf_load_stackoverflow) 1972-03-03
DK145713C (da) 1983-08-01
BE769325A (fr) 1971-11-03
DE2037258C3 (de) 1974-10-17
GB1343361A (en) 1974-01-10
AT308505B (de) 1973-07-10
DK145713B (da) 1983-02-07
CH526339A (de) 1972-08-15
DE2037258B2 (de) 1974-03-14

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