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WO1996037306A1 - Roller mill with continuous grinding-off of those grinding surfaces that are subjected to least wear - Google Patents

Roller mill with continuous grinding-off of those grinding surfaces that are subjected to least wear Download PDF

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Publication number
WO1996037306A1
WO1996037306A1 PCT/DK1996/000174 DK9600174W WO9637306A1 WO 1996037306 A1 WO1996037306 A1 WO 1996037306A1 DK 9600174 W DK9600174 W DK 9600174W WO 9637306 A1 WO9637306 A1 WO 9637306A1
Authority
WO
WIPO (PCT)
Prior art keywords
grinding
wear
roller
roller mill
subjected
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.)
Ceased
Application number
PCT/DK1996/000174
Other languages
French (fr)
Inventor
Carsten Jessen Christensen
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.)
FLSmidth and Co AS
Original Assignee
FLSmidth and Co AS
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 FLSmidth and Co AS filed Critical FLSmidth and Co AS
Priority to BR9609127A priority Critical patent/BR9609127A/en
Priority to PL96322684A priority patent/PL322684A1/en
Priority to JP8535278A priority patent/JPH11505761A/en
Priority to AU56844/96A priority patent/AU5684496A/en
Publication of WO1996037306A1 publication Critical patent/WO1996037306A1/en
Priority to MXPA/A/1997/009007A priority patent/MXPA97009007A/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • B02C4/00—Crushing or disintegrating by roller mills
    • B02C4/28—Details
    • B02C4/40—Detachers, e.g. scrapers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C4/00—Crushing or disintegrating by roller mills
    • B02C4/28—Details
    • B02C4/30—Shape or construction of rollers

Definitions

  • the present invention relates to a roller mill for grinding of particulate material, which roller mill comprises at least one grinding roller which operates interactively with at least one further grinding body, such as a grinding table, a grinding ring or a grinding roller.
  • roller mills of the abovementioned kind are well-known.
  • a vertical mill is known e.g. from DK patent No. 150818, a ring roller mill is known e.g. from DK patent application No. 748/93 and a roller press is known e.g. from international patent application No. PCT/EP92/00141.
  • a problem which is common to these types of roller mills is that the surfaces of the grinding bodies are not uniformly subjected to wear across their entire width. During operation of a roller press it has thus been ascertained that the centre areas of the rollers are subjected to wear much faster than is the case at the edges of the rollers, thereby imparting a trough-like cross profile to the roller surfaces. This is undesirable for operational reasons, and, in actual practice, it will necessitate grinding-off, turning, milling, or replacement of the high areas of the roller surfaces at appropriate intervals. Similar undesirable wear profiles are also known for the two other types of roller mills referred to above.
  • EP patent specification No. 0 383 004 is described a roller press where an attempt has been made to resolve the aforementioned problem of uneven wear by that the areas of the roller surfaces which are subjected to least wear are manufactured from a less wear-resistant material than is the case for the remaining areas of the roller surfaces. In this way a more uniform wear profile should be achieved.
  • roller mill of the kind mentioned in the introduction, and being characterized in that it comprises means which provide for continuous grinding-off of at least the areas on the surfaces of the grinding bodies which are subjected to least wear during the grinding process.
  • the surfaces of the grinding bodies are worn more uniformly across their entire width, thereby avoiding undesirable wear profiles and extending the effective lifetime of the grinding bodies.
  • Fig. 1 shows a horizontal sectional view of a first embodiment of a roller press viewed from above, which comprises grinding-off means according to the invention
  • Fig. 2 shows a section through the roller press illustrated in Fig. 1 viewed from the side
  • Fig. 3 shows a part of a second embodiment of a roller press viewed from the side, which comprises grinding-off means according to the invention
  • Fig. 4 shows a horizontal sectional view of a vertical mill viewed from above, which comprises grinding-off means according to the invention.
  • Fig. 5 shows a section through a ring-roller mill viewed from the side, which comprises grinding-off means according to the invention.
  • a roller press which comprises two oppositely rotating rollers 1 and 3, each being mounted in bearings which are not shown. At least one of the rollers 1, 3 may be fitted so that it can be displaced radially and horizontally, making it possible to adjust the gap width between the rollers.
  • the rollers 1, 3 rotate about separate axes in the direction indicated by means of the arrows.
  • the material to be ground is fed via a shaft 5 to the gap between the rollers 1, 3, which involves that the material is drawn through the gap and subjected to grinding, possibly with simultaneous formation of a grinding bed.
  • the roller press shown in Fig. 1 and 2 comprises in connection with each roller two wear blocks 7 which are fitted in a support structure 9 which is movably hinged to the machine frame 11 of the mill.
  • the roller press is further seen equipped with spring means 13 so as to thrust the wear blocks against the roller surfaces.
  • the shown wear blocks 7 are mounted at the edge zones B of the rollers and have a width which corresponds to the width hereof.
  • the roller press may in connection with each roller comprise a wear block 7 which extends across the entire width of the roller.
  • Fig. 3 shows a roller press in which each wear block 7 via a spring means 15 is directly mounted in the machine frame 11.
  • Fig. 4 is shown a horizontal section through a vertical mill which comprises a rotating grinding table 21 and three grinding rollers 23 rolling thereon.
  • the mill is equipped, in similar manner as practised for the roller press mentioned above, with wear blocks 7.
  • the shown wear blocks 7 extend across the entire width of the grinding surfaces, but may, alternatively, be designed to cover only the areas of the grinding surfaces which are subjected to least wear.
  • the wear blocks 7 are envisaged for mounting in a support structure, not shown, which, rotatably and with possible application of spring loading, is hinged to the housing of the mill or the machine frame 25.
  • Fig. 5 is seen a sectional side view through a ring roller mill which comprises a grinding ring 31 and a grinding roller 33.
  • the mill is equipped, in similar manner as practised for the previously mentioned mills, with wear blocks 7.
  • the wear blocks 7 may extend across the entire width of the grinding surfaces, but may, alternatively, be designed to cover only the areas of the grinding surfaces which are subjected to least wear.
  • the wear blocks 7 are envisaged for mounting in a support structure, not shown, which, rotatably or displaceably and with possible application of spring loading, is hinged to the housing of the mill or machine frame, not shown.
  • the wear blocks are envisaged for installation in such a way that they can be inverted and/or turned gradually as they are subjected to wear.
  • the wear blocks may be manufactured from many different materials, but they are primarily envisaged for being manufactured from granite rock, Densit, fusion-cast basalt, or a similar high-abrasive material.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
  • Grinding Of Cylindrical And Plane Surfaces (AREA)
  • Disintegrating Or Milling (AREA)

Abstract

A description is made of a roller mill for grinding of particulate material, which roller mill comprises at least one grinding roller (3, 23, 33) which operates interactively with at least one further grinding body (1, 21, 31) such as a grinding table (21), a grinding ring (31), or a grinding roller (1). The roller mill is peculiar in that it comprises means (7) which provide for a continuous grinding-off of at least the areas on the surfaces of the grinding bodies (1, 3, 21, 23, 31, 33) which are subjected to least wear during the grinding process. As a result hereof, the surfaces of the grinding bodies are worn more uniformly across their entire width, thereby avoiding undesirable wear profiles and extending the effective lifetime of the grinding bodies.

Description

96/37306 PO7DK96/00174
ROLLER MILLWITH CONTINUOUS GRINDING-OFFOFTHOSE GRINDING SURFACES j^ ARESUBJECTEDTOLEASTWEAR
The present invention relates to a roller mill for grinding of particulate material, which roller mill comprises at least one grinding roller which operates interactively with at least one further grinding body, such as a grinding table, a grinding ring or a grinding roller.
Roller mills of the abovementioned kind are well-known. Thus, a vertical mill is known e.g. from DK patent No. 150818, a ring roller mill is known e.g. from DK patent application No. 748/93 and a roller press is known e.g. from international patent application No. PCT/EP92/00141.
A problem which is common to these types of roller mills is that the surfaces of the grinding bodies are not uniformly subjected to wear across their entire width. During operation of a roller press it has thus been ascertained that the centre areas of the rollers are subjected to wear much faster than is the case at the edges of the rollers, thereby imparting a trough-like cross profile to the roller surfaces. This is undesirable for operational reasons, and, in actual practice, it will necessitate grinding-off, turning, milling, or replacement of the high areas of the roller surfaces at appropriate intervals. Similar undesirable wear profiles are also known for the two other types of roller mills referred to above.
In EP patent specification No. 0 383 004 is described a roller press where an attempt has been made to resolve the aforementioned problem of uneven wear by that the areas of the roller surfaces which are subjected to least wear are manufactured from a less wear-resistant material than is the case for the remaining areas of the roller surfaces. In this way a more uniform wear profile should be achieved.
The actual wear to which the grinding surfaces are subjected during operation depends on various operating parameters, the characteristics of the material to be ground, and other factors. In practice, it will therefore be difficult for the equipment manufacturer to select materials for the different areas of the surfaces of the grinding bodies which will ensure total elimination of the mentioned problem. At best, this known solution will only lead to an extension of the operating cycle of the roller press between two maintenance shutdowns.
It is the objective of the present invention to provide a roller mill whereby the aforementioned problem is eliminated.
This objective is achieved according to the invention by a roller mill of the kind mentioned in the introduction, and being characterized in that it comprises means which provide for continuous grinding-off of at least the areas on the surfaces of the grinding bodies which are subjected to least wear during the grinding process.
As a result hereof, the surfaces of the grinding bodies are worn more uniformly across their entire width, thereby avoiding undesirable wear profiles and extending the effective lifetime of the grinding bodies.
Further features of the invention are indicated in the claims 2-8.
In the following, the invention will be described in further details with reference being made to the drawing, which is diagrammatical, and in which
Fig. 1 shows a horizontal sectional view of a first embodiment of a roller press viewed from above, which comprises grinding-off means according to the invention, Fig. 2 shows a section through the roller press illustrated in Fig. 1 viewed from the side, Fig. 3 shows a part of a second embodiment of a roller press viewed from the side, which comprises grinding-off means according to the invention,
Fig. 4 shows a horizontal sectional view of a vertical mill viewed from above, which comprises grinding-off means according to the invention, and
Fig. 5 shows a section through a ring-roller mill viewed from the side, which comprises grinding-off means according to the invention.
Illustrated in Fig. 1 and 2 is a roller press which comprises two oppositely rotating rollers 1 and 3, each being mounted in bearings which are not shown. At least one of the rollers 1, 3 may be fitted so that it can be displaced radially and horizontally, making it possible to adjust the gap width between the rollers. The rollers 1, 3 rotate about separate axes in the direction indicated by means of the arrows. During operation, the material to be ground is fed via a shaft 5 to the gap between the rollers 1, 3, which involves that the material is drawn through the gap and subjected to grinding, possibly with simultaneous formation of a grinding bed.
After some lenght of time of operation of such a roller press it has been ascertained that the centre area of the roller surfaces, which are indicated in Fig. 1 at A, incurs wear more quickly than is the case at the areas around the edges which are indicated at B.
In order to overcome the problems which any such wear pattern may involve, it is suggested according to the invention to fit wear blocks 7 which drag against the surfaces of the two rollers in such a way that they provide for a continuous grinding-off of the areas of the roller surfaces which are subjected to least wear during the grinding process. The roller press shown in Fig. 1 and 2 comprises in connection with each roller two wear blocks 7 which are fitted in a support structure 9 which is movably hinged to the machine frame 11 of the mill. In Fig. 2 the roller press is further seen equipped with spring means 13 so as to thrust the wear blocks against the roller surfaces. The shown wear blocks 7 are mounted at the edge zones B of the rollers and have a width which corresponds to the width hereof. Alternatively, the roller press may in connection with each roller comprise a wear block 7 which extends across the entire width of the roller.
Fig. 3 shows a roller press in which each wear block 7 via a spring means 15 is directly mounted in the machine frame 11.
In Fig. 4 is shown a horizontal section through a vertical mill which comprises a rotating grinding table 21 and three grinding rollers 23 rolling thereon. For equalization of the uneven wear profile which will occur during the operation of this mill on the grinding surface of the grinding table 21 as well as on the grinding surfaces of the rollers 23, the mill is equipped, in similar manner as practised for the roller press mentioned above, with wear blocks 7. In Fig. 4 the shown wear blocks 7 extend across the entire width of the grinding surfaces, but may, alternatively, be designed to cover only the areas of the grinding surfaces which are subjected to least wear. The wear blocks 7 are envisaged for mounting in a support structure, not shown, which, rotatably and with possible application of spring loading, is hinged to the housing of the mill or the machine frame 25.
In Fig. 5 is seen a sectional side view through a ring roller mill which comprises a grinding ring 31 and a grinding roller 33. For equalization of the uneven wear profile which will occur during the operation of this mill on the grinding surface of the grinding table 31 as well as on the grinding surfaces of the roller 33, the mill is equipped, in similar manner as practised for the previously mentioned mills, with wear blocks 7. The wear blocks 7 may extend across the entire width of the grinding surfaces, but may, alternatively, be designed to cover only the areas of the grinding surfaces which are subjected to least wear. The wear blocks 7 are envisaged for mounting in a support structure, not shown, which, rotatably or displaceably and with possible application of spring loading, is hinged to the housing of the mill or machine frame, not shown.
For all the embodiments illustrated in Figs. 1 - 5, the wear blocks are envisaged for installation in such a way that they can be inverted and/or turned gradually as they are subjected to wear.
The wear blocks may be manufactured from many different materials, but they are primarily envisaged for being manufactured from granite rock, Densit, fusion-cast basalt, or a similar high-abrasive material.

Claims

1. A roller mill for grinding of particulate material which roller mill comprises at least one grinding roller (3, 23, 33) which operates interactively with at least one further grinding body (1, 21, 31), such as a grinding table (21), a grinding ring (31) or a grinding roller (1), characterized in that it comprises means (7) which provide for continuous grinding-off of at least the areas on the surfaces of the grinding bodies (1, 3, 21, 23, 31, 33) which are subjected to least wear during the grinding process.
2. A roller mill according to claim 1, characterized in that the grinding-off means (7) consist of wear blocks which drag against the grinding surfaces.
3. A roller mill according to claim 2, characterized in that each wear block (7) is movably mounted in direction towards and away from its respective grinding surface.
4. A roller mill according to claim 3, characterized in that each wear block (7) is mounted in a support structure (9) which is movably hinged to the housing of the mill or machine frame (11, 25).
5. A roller mill according to claim 4, characterized in that it further comprises spring means (13) for thrusting the wear blocks against the grinding surfaces.
6. A method according to claim 3, characterized in that each wear block (7) via a spring means (15) is mounted directly in the machine frame (11).
7. A roller mill according to any of the claims 2-6, characterized in that the wear blocks (7) can be inverted and/or turned gradually as they are subjected to wear.
8. A roller mill according to any of the preceding claims, characterized in that the grinding-off means (7) are manufactured from granite rock, Densit, fusion-cast basalt or a similar high-abrasive material.
PCT/DK1996/000174 1995-05-26 1996-04-19 Roller mill with continuous grinding-off of those grinding surfaces that are subjected to least wear Ceased WO1996037306A1 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
BR9609127A BR9609127A (en) 1995-05-26 1996-04-19 Roller mill with continuous scraping of grinding surfaces that are subject to less wear
PL96322684A PL322684A1 (en) 1995-05-26 1996-04-19 Roller mill
JP8535278A JPH11505761A (en) 1995-05-26 1996-04-19 Roller mill with continuous scraping means for grinding surfaces with minimal wear
AU56844/96A AU5684496A (en) 1995-05-26 1996-04-19 Roller mill with continuous grinding-off of those grinding surfaces that are subjected to least wear
MXPA/A/1997/009007A MXPA97009007A (en) 1995-05-26 1997-11-21 Roller mill with continuous milling of those ground surfaces that are submitted to less desga

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DK0601/95 1995-05-26
DK060195A DK171912B1 (en) 1995-05-26 1995-05-26 Rolling mill with a continuous grinding of the areas of grinding surfaces exposed to least wear

Publications (1)

Publication Number Publication Date
WO1996037306A1 true WO1996037306A1 (en) 1996-11-28

Family

ID=8095423

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DK1996/000174 Ceased WO1996037306A1 (en) 1995-05-26 1996-04-19 Roller mill with continuous grinding-off of those grinding surfaces that are subjected to least wear

Country Status (11)

Country Link
JP (1) JPH11505761A (en)
KR (1) KR19980702649A (en)
CN (1) CN1185758A (en)
AU (1) AU5684496A (en)
BR (1) BR9609127A (en)
CA (1) CA2215293A1 (en)
CZ (1) CZ374997A3 (en)
DK (1) DK171912B1 (en)
PL (1) PL322684A1 (en)
WO (1) WO1996037306A1 (en)
ZA (1) ZA964133B (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100393675B1 (en) * 1998-07-31 2003-10-10 주식회사 포스코 Apparatus of crushing debris of coating in a lime burning system
EP3621742B1 (en) 2017-05-11 2023-01-11 FLSmidth A/S Roller mill and method for operating a roller mill
US11925942B2 (en) 2021-10-22 2024-03-12 Metso Outotec USA Inc. Roller crusher and method for operating thereof
US12076729B2 (en) 2021-10-22 2024-09-03 Metso Outotec USA Inc. Roller crusher and method for arrangement thereof
US12097506B2 (en) 2021-10-22 2024-09-24 Metso Outotec USA Inc. Roller crusher and method for operating thereof

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1341599C (en) * 1984-12-03 2010-03-02 Stanley Lustig Irradiated multilayer film for primal meat packaging

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US956878A (en) * 1907-12-12 1910-05-03 Power And Mining Machinery Company Crushing-rolls.
GB716695A (en) * 1951-10-04 1954-10-13 Miag Muehlenbau & Ind Gmbh Apparatus for pressing scrapers against rollers
US2853245A (en) * 1955-04-27 1958-09-23 Jacobson Abner Mill roll scraper
US3398253A (en) * 1965-10-19 1968-08-20 F Jos Lamb Company Inc Grinding machine with electric discharge machining mechanism for reshaping crush roll

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US956878A (en) * 1907-12-12 1910-05-03 Power And Mining Machinery Company Crushing-rolls.
GB716695A (en) * 1951-10-04 1954-10-13 Miag Muehlenbau & Ind Gmbh Apparatus for pressing scrapers against rollers
US2853245A (en) * 1955-04-27 1958-09-23 Jacobson Abner Mill roll scraper
US3398253A (en) * 1965-10-19 1968-08-20 F Jos Lamb Company Inc Grinding machine with electric discharge machining mechanism for reshaping crush roll

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100393675B1 (en) * 1998-07-31 2003-10-10 주식회사 포스코 Apparatus of crushing debris of coating in a lime burning system
EP3621742B1 (en) 2017-05-11 2023-01-11 FLSmidth A/S Roller mill and method for operating a roller mill
US11925942B2 (en) 2021-10-22 2024-03-12 Metso Outotec USA Inc. Roller crusher and method for operating thereof
US12076729B2 (en) 2021-10-22 2024-09-03 Metso Outotec USA Inc. Roller crusher and method for arrangement thereof
US12097506B2 (en) 2021-10-22 2024-09-24 Metso Outotec USA Inc. Roller crusher and method for operating thereof

Also Published As

Publication number Publication date
DK171912B1 (en) 1997-08-11
MX9709007A (en) 1998-03-31
DK60195A (en) 1996-11-27
CA2215293A1 (en) 1996-11-28
CN1185758A (en) 1998-06-24
ZA964133B (en) 1996-11-27
JPH11505761A (en) 1999-05-25
KR19980702649A (en) 1998-08-05
BR9609127A (en) 1999-06-08
PL322684A1 (en) 1998-02-16
AU5684496A (en) 1996-12-11
CZ374997A3 (en) 1998-03-18

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