EP0095149A2 - Broyeur agitateur - Google Patents

Broyeur agitateur Download PDF

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Publication number
EP0095149A2
EP0095149A2 EP83104978A EP83104978A EP0095149A2 EP 0095149 A2 EP0095149 A2 EP 0095149A2 EP 83104978 A EP83104978 A EP 83104978A EP 83104978 A EP83104978 A EP 83104978A EP 0095149 A2 EP0095149 A2 EP 0095149A2
Authority
EP
European Patent Office
Prior art keywords
grinding
screw
housing
agitator mill
mill according
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
EP83104978A
Other languages
German (de)
English (en)
Other versions
EP0095149A3 (en
EP0095149B1 (fr
Inventor
Willy John
Norbert Klimaschka
Arno Wagner
Günther Meyer
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
Application filed by Erich Netzsch GmbH and Co Holding KG filed Critical Erich Netzsch GmbH and Co Holding KG
Publication of EP0095149A2 publication Critical patent/EP0095149A2/fr
Publication of EP0095149A3 publication Critical patent/EP0095149A3/de
Application granted granted Critical
Publication of EP0095149B1 publication Critical patent/EP0095149B1/fr
Expired 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S241/00—Solid material comminution or disintegration
    • Y10S241/30—Rubber elements in mills

Definitions

  • the grinding elements in the grinding chamber are subject to wear, so that their total amount is gradually reduced.
  • the wear of the grinding media can be so great that a certain amount of grinding media must be refilled into the grinding chamber on each production day in order to keep the volume part of the grinding chamber, which is filled with grinding media, approximately constant.
  • a daily loss of several kilograms of grinding media can occur.
  • the agitator mill has a continuously or at short intervals device for introducing grinding media from a storage container into the grinding chamber.
  • a device with a housing arranged between the storage container and grinding chamber and a drivable conveying element arranged therein is known from DE-2 242 174 A1.
  • the housing has a cylindrical bore opening into the grinding chamber, the diameter of which is somewhat smaller than the diameter of the grinding media.
  • the wall of the bore is elastic so that the grinding media can be pushed through the bore in succession, at least one grinding media sealing the bore tightly.
  • a piston which can be moved back and forth by a crank mechanism, is arranged as a conveying member in a section of the bore facing away from the grinding chamber, so that in each stroke it exerts a force on the rearmost grinding member, which force is transmitted via a plurality of grinding members lying one behind the other in the bore, so that the foremost grinding body is pushed into the grinding chamber.
  • the piston releases the mouth of a line through which a fresh grinding media falls from the reservoir into the bore.
  • the invention is therefore based on the object of providing an agitator mill with a device for introducing grinding media, which also makes it possible to reuse partially worn grinding media.
  • the object is achieved according to the invention in an agitator mill of the type described in the introduction in that the conveying member is a screw which can be driven in rotation. It has surprisingly been found that even grinding media with considerable differences in diameter and deviations from the spherical shape do not tend to get caught between the screw and the housing.
  • the screw can end at a distance from the grinding chamber near the beginning of a channel whose cross section increases towards the grinding chamber. This has the advantage that, on the one hand, the screw is protected from being worn out by the grinding media moving in the grinding chamber, and, on the other hand, blockages in the channel are avoided.
  • the interior of the housing receiving the screw and the storage container are preferably sealed off from the outside in a pressure-tight manner.
  • the worm can have a drive pin which is connected to an output pin of a motor by means of a coupling sleeve, the outer circumferential surface of which is sealed against the housing by a stuffing box.
  • the housing expediently has a cylindrical inner wall.
  • the screw has a conical core with a decreasing diameter in the conveying direction. This counteracts constipation.
  • the storage container can be connected to an inlet connector of the housing.
  • a helical section of the screw which is arranged in the region of the inlet connector, to be formed from elastic material. This counteracts the wear of the screw and the housing in the region of the mouth of the inlet connector.
  • the screw has a smaller diameter in the area of the inlet nozzle than within a main part of the housing adjoining the inlet nozzle.
  • a particularly effective protection against wear can be achieved in that either the screw is covered with a layer of elastic material or the housing is lined with such a layer.
  • the screw is advantageous for the screw to be arranged at least approximately horizontally in the upper region of the grinding container.
  • a stator 1 of an agitator mill which contains a drive motor, a gear and a control device.
  • a cladding 2 covers a coupling which connects the gear unit to an agitator shaft which projects from above into a grinding container 3 and is not visible in the drawings.
  • the grinding container 3 stands on feet with rollers 4 and is fastened to the stand 1 by means of holders 5.
  • a tube 6 through which ground material can be introduced into a grinding chamber inside the grinding container 3 by a pump (not shown).
  • a tube 7 At the upper end of the grinding container 3 there is a tube 7, through which treated ground material emerges from the grinding chamber.
  • a device 8 for inserting grinding media into the grinding chamber is laterally attached.
  • a bracket 9 is attached to the grinding container 3, on which a geared motor 10 and a housing 11 with an attached feed hopper 12 are arranged. Details of the device 8 are shown in Fig.2-7.
  • a horizontally lying worm 13 made of hardened steel is arranged in the housing 11.
  • a flange 14 which is screwed to a pipe socket-like insert 15.
  • the insert 15 extends through a cooling jacket 16 of the grinding container 3 and is welded to a double wall 17.
  • the grinding chamber connects to the right end of insert 15.
  • the screw 13 extends within the insert 15 through the wall 17 of the grinding container 3 and ends only in front of the grinding chamber.
  • the worm 13 has a drive pin 18 which is connected to an output pin 19 of the geared motor 10 shown in FIG. 1 by a coupling sleeve 20 and a feather key 21 and is mounted in bearings 22.
  • a bronze disc 24 and a rubber disc 25 are used to seal the interior 23 of the housing 11.
  • the housing 11 has on its upper side an inlet connection 26, above which a storage container for grinding media is arranged, for example the feed hopper 12 shown at the top in FIG. 1.
  • a storage container for grinding media for example the feed hopper 12 shown at the top in FIG. 1.
  • part of a screw flight for example according to FIG. 4, is milled out in an arc and lined with the elastic spiral section 27, which can be glued in, for example.
  • Grinding bodies 28 can then not be pinched at a critical point shown in FIG. 2 at the lower edge of the inlet connector 26, but rather are temporarily picked up by the elastic spiral section 27 and released again as soon as the screw 13 has continued to rotate.
  • the interior 23 of the housing 11 can expand conically towards the grinding container 3.
  • the housing 11 is cylindrical on the inside;
  • the screw 13 is accordingly cylindrical on the outside, but has a core 29 which is conically shaped such that its diameter 30 decreases in the conveying direction 31.
  • the free conveying cross section in the interior 23 of the housing 11 increases in the conveying direction 31, as a result of which blockage with grinding media is prevented.
  • the screw 13 is not passed through the wall 17 of the grinding container 3, but ends before the insert 15, which in this case contains a bush 35.
  • the bush 35 is conical on the inside in such a way that, starting with the same cross-section as the housing 11, it widens in the direction of the grinding container 3, that is to say in the conveying direction 31.
  • the entire cross section of the bush 35 is freely available to the grinding media 28 fed by the screw 13; therefore a jam of the grinding media is also avoided here with certainty.
  • Fig. 7 shows an embodiment that for operation with slightly higher pressure in the grinding container 3 is determined.
  • a higher pressure occurs, for example, when a highly viscous mass is treated in the grinding container 3 and is then pumped through relatively narrow gaps or another device for separating the grinding stock and grinding media.
  • the pressure in the screw housing can reach 2 bar, for example.
  • a closed, pressure-resistant storage container 37 is used for the grinding media, which is partially shown in FIG. 7 above the inlet connection 26.
  • the storage container 37 can have, for example, 30 times the volume of the housing 11 and can be provided with a refill opening, which can be closed in a pressure-tight manner, for grinding media.
  • a stuffing box with a plurality of rings 39 is arranged according to FIG. 7 because of the higher pressure, which are pressed together by gland packing 40.
  • the drive pin 18 of the worm 13 and the output pin 19 of the geared motor 10 are inserted in a coupling sleeve 42 and are non-rotatably connected to this by a parallel key 43 and 44, respectively.
  • the coupling sleeve 42 is axially attached to the drive pin 18 by a countersunk screw 45 and has a cylindrical outer surface 46 as a running surface for the rings 39 of the stuffing box.
  • the worm 13 has in its main part the outer diameter 48 which corresponds to the inner diameter of the cylindrically turned housing 11.
  • the worm 13 In its initial area, below the inlet connection 26, the worm 13, on the other hand, has only lower worm threads with an outer diameter 49.
  • the line 50 indicates the boundary between low screw flights with a diameter of 49 in the initial area and normal screw flights with a diameter of 48 in the main part of the screw 13.
  • This design of the screw 13 also contributes to the fact that the meal body without interference from the inlet port 26 into the housing 11 and further in the conveying direction 31 to the grinding container 3.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
EP83104978A 1982-05-25 1983-05-19 Broyeur agitateur Expired EP0095149B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE3219549 1982-05-25
DE3219549 1982-05-25
DE3233626 1982-09-10
DE3233626 1982-09-10

Publications (3)

Publication Number Publication Date
EP0095149A2 true EP0095149A2 (fr) 1983-11-30
EP0095149A3 EP0095149A3 (en) 1985-09-18
EP0095149B1 EP0095149B1 (fr) 1987-08-12

Family

ID=25801987

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83104978A Expired EP0095149B1 (fr) 1982-05-25 1983-05-19 Broyeur agitateur

Country Status (3)

Country Link
US (1) US4558825A (fr)
EP (1) EP0095149B1 (fr)
DE (1) DE3372930D1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113789193A (zh) * 2021-08-31 2021-12-14 华中科技大学 一种秸秆进料系统

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3629421C1 (de) * 1986-08-29 1987-12-17 Netzsch Maschinenfabrik Verfahren und Vorrichtung zum Zufuehren von Mahlkoerpern
DE3727863C1 (de) * 1987-08-20 1989-03-02 Netzsch Erich Holding Ruehrwerksmuehle mit Zufuehrrohr fuer Mahlkoerper
DE3902689C1 (en) * 1989-01-30 1990-02-22 Erich Netzsch Gmbh & Co Holding Kg, 8672 Selb, De Device for introducing milling aid bodies into mills, in particular agitator mills
US6300390B1 (en) 1998-06-09 2001-10-09 Kerr Corporation Dental restorative composite
US6121344A (en) * 1998-06-19 2000-09-19 Kerr Corporation Optimum particle sized hybrid composite
US6010085A (en) * 1999-03-17 2000-01-04 Kerr Corporation Agitator mill and method of use for low contamination grinding
US20160101426A1 (en) 2013-05-21 2016-04-14 Flsmidth A/S Methods and apparatus for the continuous monitoring of wear in grinding circuits

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US801854A (en) * 1904-01-14 1905-10-17 Nat Mica And Grinding Co Ltd Machine for grinding.
US1086024A (en) * 1909-11-26 1914-02-03 Allis Chalmers Mfg Co Tube-mill feeder.
US1712082A (en) * 1921-08-11 1929-05-07 Koppers Heinrich Process and apparatus for distilling solid carbonaceous material
US2592783A (en) * 1946-04-17 1952-04-15 Aspegren Olof Erik August Rotary heat exchanger
GB667484A (en) * 1950-03-08 1952-03-05 Smidth & Co As F L Improvements relating to the grinding of materials
US2595117A (en) * 1950-03-08 1952-04-29 Smidth & Co As F L Method and apparatus for grinding
DE2242174A1 (de) * 1972-08-26 1974-03-07 Netzsch Maschinenfabrik Verfahren und vorrichtung zum feinmahlen und dispergieren

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113789193A (zh) * 2021-08-31 2021-12-14 华中科技大学 一种秸秆进料系统

Also Published As

Publication number Publication date
US4558825A (en) 1985-12-17
DE3372930D1 (en) 1987-09-17
EP0095149A3 (en) 1985-09-18
EP0095149B1 (fr) 1987-08-12

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