EP1952887A1 - Trommelmühle - Google Patents
Trommelmühle Download PDFInfo
- Publication number
- EP1952887A1 EP1952887A1 EP07425047A EP07425047A EP1952887A1 EP 1952887 A1 EP1952887 A1 EP 1952887A1 EP 07425047 A EP07425047 A EP 07425047A EP 07425047 A EP07425047 A EP 07425047A EP 1952887 A1 EP1952887 A1 EP 1952887A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- liners
- mill
- liner
- ring
- rotating
- 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- Withdrawn
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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
- B02C17/18—Details
- B02C17/22—Lining for containers
Definitions
- the present invention refers to a rotating mill with horizontal axis-for the grinding of materials.
- the invention concerns a rotating mill of the type having a substantially cylindrical shell comprising at least one crushing chamber and possible (two or three) other chambers internally covered with a armour-plating and intended to contain the material to be ground as well as a load of grinding bodies.
- Rotating mills of the aforesaid type are widely used for the grinding of materials in the construction sector, for example for the production of cement, and in the mining industry.
- Such mills comprise a cylindrical shell of metal material rotating around a longitudinal axis and internally lined in a first chamber or crushing chamber and in possibly other chambers with a armour-plating composed of a series of axially-mounted, juxtaposed liner rings which substantially cover the entire circumferential surface of the cylindrical shell.
- the single liners usually have a ramp or step profile (in some cases) or an undulated profile (in other cases) for promoting, during the mill rotation, the lifting of the grinding bodies and the material to be ground and their subsequent dropping in a substantially central zone of said mill, what involves the crushing and grinding of the material between the grinding bodies, the latter usually consisting of metal (for example steel) balls.
- the liners are made with a curved profile which substantially follows the circumferential profile of the cylindrical shell, so to be based on and installed on the latter in a series of axially-mounted, juxtaposed liner rings which substantially cover the entire circumferential surface of the cylindrical shell.
- the fixing of the liner rings to the cylindrical shell can be achieved in various ways, for example through fixing bolts passing through the liners and the cylindrical shell, or alternatively the liners can be maintained in pressure contact against the cylindrical shell, for example by means of the arching effect attained by fit-coupling liners of the same ring and inserting a special wedge-shaped bolted liner.
- Mixed fixing systems are also provided by means of bolts and fit coupling.
- the liners are made in particular in the grinding chamber with a constant circumferential length (arc length) around a theoretical value of 314 mm, with manufacturing tolerances of +- 5-6 mm.
- a number of liners equal to 40 is provided in the prior art for each liner ring.
- a further drawback of the rotating mills of the prior art moreover lies in a certain structural difficulty of the liners deriving from the need to provide zones with different radial height, above all in the crushing chamber, so as to have the aforesaid step (or steps) or undulations necessary for the lifting of the material and grinding bodies for the efficient grinding of said material.
- the technical problem underlying the present invention is that of making available a rotating mill which has structural and functional characteristics such to overcome or limit at least in part the drawbacks mentioned above with reference to the prior art.
- a rotating mill comprising a cylindrical shell rotating around a longitudinal axis and internally lined with a armour-plating consisting of a series of juxtaposed liner rings, characterised in that each liner of a set liner ring has a circumferential length (arc length) comprised in the range of 100 mm - 200 mm.
- each liner of a set liner ring has a circumferential length comprised in the range of 147 mm - 167 mm.
- each liner of a set liner ring has a circumferential length of about 157 mm.
- said series of juxtaposed liner rings are arranged at least in one crushing chamber of said mill.
- the liners are mounted axially, with the possibility to be aligned (along the longitudinal axis of the cylindrical shell) or staggered o non-axially mounted or with a mixed axial - non-axial arrangement.
- the present invention it has been found that by limiting the longitudinal length of the liners in the above-indicated range of values, the destabilising effects induced by the deformations of the cylindrical shell are greatly reduced, as are, consequently, the risks of detachment and breaking of the liners during the operation of the rotating mill, without comprising the excellent wear-resistance of the liners and grinding efficiency which are comparable with those of the mill liners according to the prior art.
- each liner ring comprises a plurality of liners, preferably in the crushing chamber, which follow each other in the circumferential direction according to a predefined order, each liner having a step on the rear face, seen from the rotation direction of the mill, of greater radial height than that of the front face.
- all of the liners of each ring are capable of lifting the material and the load of grinding bodies, which is advantageous for an increased grinding efficiency.
- each liner ring comprises first liners and at least one second liner which follow one another in the circumferential direction according to a predefined order, each first liner having a step on the rear face, seen from the rotation direction of the mill, of greater radial height than that of the front face and said at least one second liner having instead a radial height on the rear face, seen from the rotation direction of the mill, substantially equal to that of the front face.
- each liner ring comprises a plurality of first liners and a plurality of second liners which follow each other in the circumferential direction according to an alternating or non-alternating sequence.
- the productive cycle of the liners is advantageously simplified since a smaller number of liners is provided with steps without compromising the lifting of the material and grinding bodies necessary to obtain an efficient grinding of said material.
- the aforesaid second liners have a constant radial height between the respective front and rear faces.
- the rotating mill 1 comprises a cylindrical shell 2 rotating around a longitudinal axis X and closed at opposite ends by respective bottoms (not shown since they are conventional), and having at least one crushing/ grinding chamber equipped with an opening for the inlet of the material to be ground and of the loading of grinding bodies in the rotating mill 1 and for the outlet of the ground material together with the grinding bodies.
- the cylindrical shell is internally lined with a armour-plating composed of a series 3 of juxtaposed liner rings which substantially cover the entire internal surface of the cylindrical shell 2. For the sake of simplicity in figure 1 only one ring 3 of liners is shown.
- the liners are composed of a metal material with high wear-resistance, of per se conventional type.
- each liner ring 3 has a circumferential length of about 157 mm (theoretical value), or a circumferential length equal to about half that of the liners according to the prior art.
- the number of liners of a rotating mill with 4m diameter is equal to 80 for each liner ring.
- each ring 3 comprises a plurality of first liners 4 and a plurality of second liners 5 which follow each other in the circumferential direction according to an alternating sequence.
- the liners 4 are of the type with upper step profile, since they have a step 6 on the rear face 4a, seen from the rotation direction A of the mill 1, of greater radial height than the height of the front face 4b.
- the liners 5 lack of step and have a substantially constant radial height between the respective rear 5a and front 5b faces, as seen from the rotation direction A of the mill.
- the first liners 4 and the second liners 5 On the lower part, in contact with the cylindrical shell 2, the first liners 4 and the second liners 5 have a profile substantially matching that of the cylindrical shell 2 on which they are supported at lower end portions 8. A cavity 9 is moreover made at the lower surface of the liners 4 and 5, between the support portions 8 on the cylindrical shell 2.
- the first liners 4 and the second liners 5 in series with each other to form the rings 3 can be axially aligned, i.e. along the longitudinal axis X of the cylindrical shell 2, or non-aligned (staggered), or in part aligned and in part non-aligned.
- the rotating mill 1 is moreover provided with means of maintaining the first liners 4 and the second liners 5 of each ring 3 under pressure against the cylindrical shell, substantially by means of the arching effect.
- each first liner 4 or second liner 5 of a ring 3 has, on its rear face 4a or 5a and on its front face 4b and 5b, a respective recess 10 and said means are a plurality of elements of template thickness 13 interposed between consecutive first liners 4 and second liners 5 of each ring 3, the elements 13 being provided with opposing projections 12 which are coupled into respective facing recesses 10 of said consecutive first liners 4 and said second liners 5.
- bolted rows of liners and/or specific bolted liners may also be provided.
- a further advantage of the rotating mill according to the invention lies in the greater ease of installation of the liners and of substitution of the latter in case of need.
Landscapes
- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Crushing And Grinding (AREA)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP07425047A EP1952887A1 (de) | 2007-01-30 | 2007-01-30 | Trommelmühle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP07425047A EP1952887A1 (de) | 2007-01-30 | 2007-01-30 | Trommelmühle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP1952887A1 true EP1952887A1 (de) | 2008-08-06 |
Family
ID=38115320
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP07425047A Withdrawn EP1952887A1 (de) | 2007-01-30 | 2007-01-30 | Trommelmühle |
Country Status (1)
| Country | Link |
|---|---|
| EP (1) | EP1952887A1 (de) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9283566B2 (en) | 2009-08-12 | 2016-03-15 | Fluor Technologies Corporation | Configurations for liners in grinding mill with gearless motor drive |
| RU179532U1 (ru) * | 2017-12-28 | 2018-05-17 | федеральное государственное бюджетное образовательное учреждение высшего образования "Белгородский государственный технологический университет им. В.Г. Шухова" | Ступенчатая футеровка шаровой барабанной мельницы |
| US10298080B2 (en) | 2012-01-20 | 2019-05-21 | Fluor Technologies Corporation | Rotor pole support ribs in gearless drives |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1135469A (fr) * | 1954-08-27 | 1957-04-29 | Babcock & Wilcox France | Revêtement d'usure pour broyeurs |
| FR1524865A (fr) | 1966-06-06 | 1968-05-10 | Magotteaux Fond | Plaque de blindage pour revêtement de broyeurs à boulets ou à barres broyantes |
| WO1998016317A1 (de) * | 1996-10-15 | 1998-04-23 | Christian Pfeiffer Maschinenfabrik Gmbh | Verschleissauskleidung, insbesondere verschleissfutter, für rohr- und/oder kugelmühlen |
| EP1018368A1 (de) * | 1998-12-21 | 2000-07-12 | Christian Pfeiffer Maschinenfabrik GmbH | Verschleissauskleidung für Rohr- und/oder Kugelmühlen |
-
2007
- 2007-01-30 EP EP07425047A patent/EP1952887A1/de not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1135469A (fr) * | 1954-08-27 | 1957-04-29 | Babcock & Wilcox France | Revêtement d'usure pour broyeurs |
| FR1524865A (fr) | 1966-06-06 | 1968-05-10 | Magotteaux Fond | Plaque de blindage pour revêtement de broyeurs à boulets ou à barres broyantes |
| WO1998016317A1 (de) * | 1996-10-15 | 1998-04-23 | Christian Pfeiffer Maschinenfabrik Gmbh | Verschleissauskleidung, insbesondere verschleissfutter, für rohr- und/oder kugelmühlen |
| EP1018368A1 (de) * | 1998-12-21 | 2000-07-12 | Christian Pfeiffer Maschinenfabrik GmbH | Verschleissauskleidung für Rohr- und/oder Kugelmühlen |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9283566B2 (en) | 2009-08-12 | 2016-03-15 | Fluor Technologies Corporation | Configurations for liners in grinding mill with gearless motor drive |
| US10298080B2 (en) | 2012-01-20 | 2019-05-21 | Fluor Technologies Corporation | Rotor pole support ribs in gearless drives |
| RU179532U1 (ru) * | 2017-12-28 | 2018-05-17 | федеральное государственное бюджетное образовательное учреждение высшего образования "Белгородский государственный технологический университет им. В.Г. Шухова" | Ступенчатая футеровка шаровой барабанной мельницы |
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| STAA | Information on the status of an ep patent application or granted ep patent |
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| 18D | Application deemed to be withdrawn |
Effective date: 20110803 |