EP0299529A2 - Broyeur, en particulier broyeur à agitateur - Google Patents

Broyeur, en particulier broyeur à agitateur Download PDF

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Publication number
EP0299529A2
EP0299529A2 EP88111435A EP88111435A EP0299529A2 EP 0299529 A2 EP0299529 A2 EP 0299529A2 EP 88111435 A EP88111435 A EP 88111435A EP 88111435 A EP88111435 A EP 88111435A EP 0299529 A2 EP0299529 A2 EP 0299529A2
Authority
EP
European Patent Office
Prior art keywords
mill according
ceramic
ceramic rings
rings
wall
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.)
Withdrawn
Application number
EP88111435A
Other languages
German (de)
English (en)
Other versions
EP0299529A3 (fr
Inventor
Norbert Klimaschka
Wolfgang Schmidt
Udo Enderle
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 EP0299529A2 publication Critical patent/EP0299529A2/fr
Publication of EP0299529A3 publication Critical patent/EP0299529A3/fr
Withdrawn legal-status Critical Current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

Definitions

  • the invention relates to a mill, in particular an agitator mill, with a grinding container which has an inner wall made of abrasion-resistant material.
  • the grinding container of which is made of steel or other metal
  • linings can only be made with more or less porridge Produce joints that have to be filled with a binding agent, such as mortar, and are usually more susceptible to wear than the stones themselves.
  • a binding agent such as mortar
  • Such linings or linings are particularly common in ball mills up to the largest dimensions.
  • one-piece mortars made of natural stone or porcelain have been used to crush materials into powders since ancient times.
  • the grinding vessels of which cannot be produced in one piece from abrasion-resistant material, in particular high-strength ceramic there has hitherto been no lining which can be produced from a material adapted to the material to be ground and, depending on the case, according to the material to be processed Grist can be installed and is largely wear-resistant.
  • the object of the invention is therefore to create a mill with such a lining.
  • the object is achieved, starting from a mill of the type described in the introduction, in that the inner wall is composed of a plurality of ceramic rings which are held together by a covering.
  • Ceramic rings can be manufactured in all practically occurring sizes, whereby conventional manufacturing processes of turning or casting can be used. Such rings can be produced and burned with an axial length of the order of 2 to 6 times, preferably 3 to 5 times their thickness, without them being distorted or even tearing. From any number of such rings, a more or less long inner wall of a grinding container can be assembled from case to case.
  • the ceramic rings are preferably made of silicon nitride.
  • other nitrides are also suitable, in particular aluminum nitride, titanium nitride, zirconium nitride, yttrium nitride, magnesium nitride, beryllium nitride and hexagonal or cubic boron nitride.
  • Certain carbides are particularly suitable for other applications, for example silicon carbide, boron carbide, titanium carbide, tantalum carbide, tungsten carbide and polycrystalline diamond.
  • the ceramic rings can also be mixed ceramics consisting of oxidic and non-oxide masses.
  • the individual ceramic rings can have flat end faces that butt against one another. However, it is expedient if the ceramic rings have interlocking profiles on their end faces; for example, profiles in the manner of tongue and groove connections and conical profiles are suitable. Such profiles center the ceramic rings with respect to one another and connect them together to form a structurally and dynamically highly resilient inner wall.
  • the resilience of the connection between the individual ceramic rings can be increased further by the fact that the ceramic rings are glued to one another at their end faces.
  • the ceramic rings each have at least one radially outwardly projecting flange on which the casing lies.
  • the ceramic rings can be stiffened in such a way that they need only have a small wall thickness.
  • the thin wall thickness improves the ability of the ceramic rings to dissipate the heat generated in the mill.
  • coolant channels are formed between the flanges.
  • the covering can be a metal tube or consist of individual rings, preferably made of metal, or it can be a helical bandage, which preferably also consists of metal.
  • the covering is a helical bandage, then it expediently forms a coolant channel itself.
  • the covering can be shrunk onto the ceramic rings.
  • rods which extend radially inwards to be fastened to the inner wall of the grinding container.
  • Such rods can in principle also consist of ceramic material or be clad with such material.
  • some of the ceramic rings of the inner wall of the grinding container have projections which are integrally formed and project radially inwards.
  • a ceramic ring with a smooth inside can be arranged axially between each two ceramic rings, which have radially inwardly projecting projections.
  • an agitator shaft with an outer wall composed of ceramic rings is arranged inside the grinding container.
  • each of the ceramic rings provided with projections has an inner wall of the grinding container the outside of the smooth ceramic ring is radially opposite the stirrer shaft and each ceramic ring which is smooth on the inside of the inner wall of the grinding container is provided with a ceramic ring which is integrally formed with radially outwardly projecting projections and which is radially opposite the outer wall of the stirring shaft.
  • the ceramic rings of the agitator shaft are preferably attached to a metal core and held together by this in the axial direction.
  • the projections of the inner wall of the grinding container and / or the outer wall of the stirring shaft are approximately trapezoidal in axial and radial cross section.
  • a grinding container 10 which has a casing 12 in the form of an internally smooth, cylindrical steel tube.
  • An annular flange 14 or 16 is welded to each of the two end faces of this casing 12.
  • a coolant line 18 in the form of a semicircular metal tube is wound around the outer circumferential surface of the casing 12 and is also welded or soldered on.
  • the grinding container 10 has an inner wall which is composed of several ceramic rings 20. These consist, for example, of silicon nitride and are closely joined together on the end face.
  • the end faces of the ceramic rings 20 can, as shown in the right part of FIG. 1, be flat, so that the ceramic rings butt against one another. In this case, it is particularly expedient if the ceramic rings 20 are glued to one another on the end face.
  • the ceramic rings 20 can have end faces 22 and 24 which are profiled complementarily to one another.
  • ceramic rings 20 are shown in the left part of FIG. 1, each having a left end face 22 provided with a rib profile and a right end face 24 complementarily grooved thereto. Adjacent ceramic rings 20 with end faces 22 and 24 designed in this way interlock in the manner of tongue and groove profiles.
  • FIG. 2 Another possibility of having the ceramic rings 20 engage in one another at the end is shown in FIG. 2; there the ceramic rings 20 each have a hollow conical end face 22 and a correspondingly conical end face 24.
  • the cover 12 is shrunk onto the ceramic rings 20 assembled in the manner described in such a way that the cylindrical outer surfaces of the ceramic rings 20 lie completely against the cover 12.
  • each individual ceramic ring 20 has a radially outwardly projecting annular flange 26, on the outer lateral surface of which the sheath 12 is shrunk.
  • the flanges 26 are each arranged in a central region of the associated ceramic ring 22, while according to FIG. 4 the flanges 26 are each arranged at one end of the associated ceramic ring 20.
  • an annular coolant channel 28 is left free between the flanges 26 of adjacent ceramic rings 20.
  • the coolant channels 28 can be combined to form an uninterrupted coolant channel 30, for example in that each flange 26 has an axially parallel cutout 32 and the ceramic rings 20 are arranged in such a way that the cutouts 32 of adjacent ceramic rings are offset from one another by 180 °.
  • the casing 12 consists of rings of flat rectangular cross section, each covering a joint between adjacent ceramic rings 20.
  • This cover 12 can also be attached by shrinking; alternatively, the rings, of which the casing 12 is formed, can be clamped with tension locks of a known type.
  • the ceramic rings 20 and the casing 12 are surrounded by an outer cylindrical jacket 34 made of steel, which at both ends rests tightly on a thickened ring 36 and 38 each belonging to the casing 12, so that it has a tubular coolant channel 40 encloses.
  • Fig. 6 a modification of Fig. 5 is shown, in which the covering 12 by one around the ceramic rings 12 wen a deliberately wound, profiled metal band is formed.
  • the wrapped sheath 12 has a U-shaped profile; in the lower half of FIG. 6, however, the wrapped sheath 12 has a T-shaped profile.
  • webs 42 of this profile lie close to the outer jacket 34, so that they form a helical coolant channel 40 corresponding to the helical course of the casing 12.
  • the grinding container 10 has ceramic rings 20 essentially in the design and arrangement corresponding to the right part of FIG. 1.
  • the ceramic rings 20 are cylindrical on the inside.
  • One of these ceramic rings 20 is tightly connected to a base plate 44, which consists of the same ceramic material as the ceramic rings 20.
  • On the lowest ceramic ring 20 there is a ceramic ring 20 of the same shape and size, that is to say also with a smooth inner surface.
  • the projections 48 are formed in one piece with the ceramic ring 46 and have a trapezoidal shape in the axial cross section according to FIG. 7 as well as in the radial cross section according to FIG. 8.
  • On the ceramic ring 46 there is again a ceramic ring 20 which is smooth on the inside; there is a further ceramic ring 46, which is provided with projections 48, etc.
  • an agitator shaft 50 Arranged within the grinding container 10 is an agitator shaft 50 which has a double-walled, tubular metal core 52 and ceramic rings 54 and 56 fastened thereon. Every second ceramic ring 54 is smooth on the outside and enclosed by one of the ceramic rings 46 provided with projections 48. The other ceramic rings 56 are on the outside Provide projections 58 which extend radially outward in the direction of a smooth ceramic ring 20 of the grinding container 10 which surrounds the relevant ceramic ring 56.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
  • Crushing And Pulverization Processes (AREA)
EP88111435A 1987-07-16 1988-07-15 Broyeur, en particulier broyeur à agitateur Withdrawn EP0299529A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19873723558 DE3723558A1 (de) 1987-07-16 1987-07-16 Muehle, insbesondere ruehrwerksmuehle
DE3723558 1987-07-16

Publications (2)

Publication Number Publication Date
EP0299529A2 true EP0299529A2 (fr) 1989-01-18
EP0299529A3 EP0299529A3 (fr) 1989-11-08

Family

ID=6331719

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88111435A Withdrawn EP0299529A3 (fr) 1987-07-16 1988-07-15 Broyeur, en particulier broyeur à agitateur

Country Status (3)

Country Link
US (1) US4915307A (fr)
EP (1) EP0299529A3 (fr)
DE (1) DE3723558A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19853766C2 (de) * 1998-11-21 2001-05-03 Netzsch Erich Holding Mahlbehälter mit Keramikauskleidung
EP3357580A1 (fr) * 2017-02-03 2018-08-08 NETZSCH-Feinmahltechnik GmbH Broyeur agitateur ayant un revêtement en céramique

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5065946A (en) * 1988-07-21 1991-11-19 Matsushita Electric Industrial Co., Ltd. Media agitating mill and method for milling ceramic powder
US5213702A (en) * 1988-07-21 1993-05-25 Matsushita Electric Industrial Co., Ltd. Media agitating mill and method for milling ceramic powder
DE4113490A1 (de) * 1991-04-25 1992-10-29 Leipzig Lacke Gmbh Verfahren und vorrichtung zum zerkleinern, dispergieren, benetzen und mischen von pumpfaehigen, unmagnetischen mehrphasengemischen
CH688849A5 (de) * 1993-02-25 1998-04-30 Buehler Ag Ruehrwerksmuehle.
SE9400224L (sv) * 1994-01-26 1995-07-27 Sala International Ab Anordning för malning av mineralprodukt
DE4426211C2 (de) * 1994-07-23 1997-11-06 Maalwerk Amsterdam Bv Auskleidung für die Trommeln von Kugelmühlen
EP0913200B1 (fr) * 1997-10-28 2003-04-23 DRAISWERKE GmbH Broyeur agitateur
JPH11138024A (ja) * 1997-11-13 1999-05-25 Shizuoka Seiki Co Ltd 精穀機
GB9901828D0 (en) * 1999-01-27 1999-03-17 Withdeal Limited Milling machine
DE10335552B4 (de) * 2003-08-02 2005-07-28 Stephan Machinery Gmbh & Co. Mischwelle zur Durchmischung und Zerteilung von Lebensmittelprodukten sowie Verfahren zur Herstellung eines Überzugs für eine derartige Mischwelle
GB0516549D0 (en) * 2005-08-12 2005-09-21 Sulaiman Brian Milling system
US7571871B2 (en) * 2005-11-04 2009-08-11 Rutgers, The State University Of New Jersey Uniform shear application system and methods relating thereto
CA2912729A1 (fr) 2013-05-21 2014-11-27 Flsmidth A/S Procedes et appareil de surveillance en continu de l'usure dans des circuits de meulage
ES2740806T3 (es) * 2017-04-18 2020-02-06 Bachofen Willy A Ag Elemento anular indeformable para un revestimiento de intercambio térmico

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2931868A1 (de) * 1979-08-06 1982-04-01 Annawerk Keramische Betriebe GmbH, 8633 Rödental Mahlgefaess sowie verfahren zu seiner herstellung und verfahren zum aufmahlen von insbesondere sehr hartem koernigen gut, wie keramischen pulvern
WO1986004526A1 (fr) * 1985-02-08 1986-08-14 Slegten, Societe Anonyme Dispositif de regulation du temps de sejour d'un materiau dans un broyeur

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US851637A (en) * 1907-01-09 1907-04-30 Max F Abbe Lining for pebble-mills.
US1468893A (en) * 1920-01-23 1923-09-25 Franklin H Wolever Pulverizing mill
US2204582A (en) * 1937-09-01 1940-06-18 Feldspathic Res Corp Wear-resisting ceramic composition
SU383461A1 (ru) * 1971-06-10 1973-05-23 Бронефутеровка трубной мельницы
SU391855A1 (ru) * 1971-11-29 1973-07-27 Ю. А. Рухлов Оленегорский горнообогатительный комбинат Защитная самоудерживающаяся эластичная
CH618893A5 (fr) * 1977-04-29 1980-08-29 Buehler Ag Geb
JPS5922577B2 (ja) * 1978-12-13 1984-05-28 富士写真フイルム株式会社 湿式媒体分散装置

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2931868A1 (de) * 1979-08-06 1982-04-01 Annawerk Keramische Betriebe GmbH, 8633 Rödental Mahlgefaess sowie verfahren zu seiner herstellung und verfahren zum aufmahlen von insbesondere sehr hartem koernigen gut, wie keramischen pulvern
WO1986004526A1 (fr) * 1985-02-08 1986-08-14 Slegten, Societe Anonyme Dispositif de regulation du temps de sejour d'un materiau dans un broyeur

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19853766C2 (de) * 1998-11-21 2001-05-03 Netzsch Erich Holding Mahlbehälter mit Keramikauskleidung
EP3357580A1 (fr) * 2017-02-03 2018-08-08 NETZSCH-Feinmahltechnik GmbH Broyeur agitateur ayant un revêtement en céramique
EP3357580B1 (fr) 2017-02-03 2019-05-15 NETZSCH-Feinmahltechnik GmbH Broyeur agitateur ayant un revêtement en céramique
US10870116B2 (en) 2017-02-03 2020-12-22 Netzsch-Feinmahltechnik Gmbh Agitator ball mill with ceramic lining

Also Published As

Publication number Publication date
DE3723558A1 (de) 1989-01-26
US4915307A (en) 1990-04-10
EP0299529A3 (fr) 1989-11-08

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