EP0271502B1 - Bloc de broyage pour raffineur - Google Patents

Bloc de broyage pour raffineur Download PDF

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Publication number
EP0271502B1
EP0271502B1 EP87902533A EP87902533A EP0271502B1 EP 0271502 B1 EP0271502 B1 EP 0271502B1 EP 87902533 A EP87902533 A EP 87902533A EP 87902533 A EP87902533 A EP 87902533A EP 0271502 B1 EP0271502 B1 EP 0271502B1
Authority
EP
European Patent Office
Prior art keywords
grinding
block
grinding block
refiner
detachable
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
EP87902533A
Other languages
German (de)
English (en)
Other versions
EP0271502A1 (fr
Inventor
Esa Viljakainen
Kari Blomster
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.)
Sunds Defibrator Jylha OY
Original Assignee
Sunds Defibrator Jylha OY
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 Sunds Defibrator Jylha OY filed Critical Sunds Defibrator Jylha OY
Priority to AT87902533T priority Critical patent/ATE62288T1/de
Publication of EP0271502A1 publication Critical patent/EP0271502A1/fr
Application granted granted Critical
Publication of EP0271502B1 publication Critical patent/EP0271502B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D1/00—Methods of beating or refining; Beaters of the Hollander type
    • D21D1/20—Methods of refining
    • D21D1/30—Disc mills
    • D21D1/306—Discs

Definitions

  • the present invention relates to a grinding block for a refiner, especially a disc refiner or a conic refiner, consisiting of a sector or paert of a sector of a griding disc or cone made of stainless steel.
  • the most important phase in the process of pulp production is the grinding of the wood material, which is done by refiners specially designed for the purpose.
  • the disc refiner which grinds the wood chips between two discs placed face to face, is the most commonly used type of refiner, although the conic refiner is also important. Since the grinding takes place under high pressure, with water used for fluidization and lubrication, and since plenty of organic acids are produced from the disintegrating wood pulp, the material from which the grinding discs and cones are manufactured deserves special attention.
  • the grinding elements must be hard and durable, but they must also have good resistance to corrosion. Morover, they must be made of a material that is tough enough to withstand the various strains caused by pressure shocks and other disturbances.
  • the steel material most commonly used in the grinding elements is stainless martensite steel containing 14-18% of chrome, depending on the carbon content.
  • Such steel is relatively inexpensive and hard and allows further heat treatment and hardening. In addition, it has good resistance to the chemical conditions present in the refiner.
  • the worst drawback, especially with the hardest kind of steel (with a carbon content of 1.2-1.5%) is the brittleness of the material, entailing a low resistance against impacts and tensile stress.
  • these steels have provided the best compromise to meet the conflicting requirements, but when e.g.
  • the discs and cones are composed of several so called grinding blocks, which in fact are sectors or parts of a sector of a disc or cone.
  • US patent 4,423,845 proposes a grinding sector with a locally hardened grinding surface, thus allowing a better control of the refining process.
  • the proctice of incorporating various substances, e.g. ceramics, and parts made of such substances, in the desired areas of the grinding element to achieve a better refining result is known from the above-mentioned patent and also from the British patent publication 1,228,046 as well as from the Soviet inventor's certificate 502,993.
  • DE-A-23 15 219 describes a method for manufacturing of a grinding disc having a number of grinding blocks each one being provided with a fixed surface of harder material than the other parts of the grinding block.
  • US-A-4 274 602 discloses a rotary grinding disc, and is substantially related to how the grinding blocks are attached to the disc.
  • WO84/04057 shows a device wherein each grinding block is individually secured to the carrier by means of separate movable locking members. This publication merely discloses a locking system as described in the abstract thereof.
  • a grinding disc consists of several elements, referred to as grinding blocks, and which grinding blocks in themselves are detachably attached to a carrier.
  • the object of the present invention is to eliminate the drawbacks mentioned and to provide a new type of grinding block for a disc or conic refiner in which the questions referred to above have been taken into consideration.
  • the grinding block of the invention is characterized in that at least part of the grinding surface of the block is constituted by one or more detachable segments made of a substantially harder and more durable material than the rest of the grinding block, and that the block is provided with means for securing this detachable segment.
  • the advantages of the grinding block of the invention include an almost complete immunity to brittle fracture, the possibility of partial replacement and renewal of the grinding elements and a high degree of hardness and durability of the detachable segments.
  • the detachable parts will best serve their purpose if mounted near the periphery of the grindng block, where the radial velocity is highest and, therefore, the strain greatest.
  • the grinding block 1 shown in fig. 1 is provided with two detachable parts or grinding segments 2, which are made of a substantially harder and more durable material than the rest of the block 1.
  • the hardening may be effected on a forged bloom either before or after it is fitted in the grinding block.
  • Ceramics suitable for use as a coating material.
  • the embodiment in figure 2 is provided with means 3 for securing the detachable grinding segments.
  • the grinding block 1 is provided with shoulders 3 which constitute a dovetail joint to secure the segments 2 in a form-locked manner.
  • shoulders 3 which constitute a dovetail joint to secure the segments 2 in a form-locked manner.
  • Figure 3 shows in perspective an embodiment employing bolts 4 to ensure that the cutter segments are firmly secured. Because of the great centrifugal force generated by the fast rotation of the grinding block in practical use, it is always preferable to provide the outer edge of the block 1 with a shoulder 3 to support the detachable segment 2, thus enabling the compressive strength of the segment 2 to be effectively utilized while at the same time firmly securing the segment in the grinding block 1.
  • the detachable segments may be secured in the grinding block by a sole or an auxiliary means of securement. When the block is damaged, this kind of joints are generally also disjoined, so that they will not present a notable obstruction to the replacement of the segments.
  • the segments may also be fixed in place by means of an adhesive medium, such as glue.
  • the detachable segments 2 are to be secured in the manner shown in fig. 2, it is also possible to make the segments from a durable cast iron, such as white martensite cast iron, by casting the segments in the space between the shoulders 3 in the grinding block. In this case it is naturally necessarry to use a casting mould, which is placed over the grinding block 1. The mould is not shown in the drawing. To facilitate the removal of the cast segments 2, a suitable loosening agent may be applied to the grinding block before the casting is performed.
  • a durable cast iron such as white martensite cast iron

Landscapes

  • Crushing And Grinding (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Disintegrating Or Milling (AREA)

Abstract

Bloc de broyage (1) pour raffineur, se composant d'un secteur ou d'une partie de secteur d'un disque ou d'un cône de broyage en acier inoxydable. Dans les raffineurs connus, le plus grand inconvénient avec les types d'acier (ayant une teneur en carbone de 1,2 à 1,5 %) utilisés dans les blocs de broyage est la fragilité du matériau, ce qui entraîne une faible résistance aux chocs et à l'effort de traction. On résout ce problème dans la présente invention en concevant au moins une partie de la surface de broyage du bloc de telle sorte qu'elle soit constituée par un ou plusieurs segments amovibles (2) à base d'un matériau sensiblement plus dur et plus résistant que le reste du bloc de broyage (1), et en prévoyant que le bloc soit pourvu d'organes (3, 4) destinés à fixer ledit segment amovible.

Claims (7)

1. Bloc de broyage (1) pour raffineur, en particulier raffineur à disques ou raffineur conique, consistant en un secteur séparé ou une partie de secteur, fixé à un élément support d'un disque ou cône de broyage en acier inoxydable, caractérisé en ce qu'une partie de la surface de broyage du bloc (1) est constituée par un ou plusieurs segments détachables (2) fabriqués en une matière sensiblement plus dure et plus durable que le reste du bloc de broyage (1), et en ce que le bloc comporte des moyens (3, 4) de fixation de ce segment détachable.
2. Bloc de broyage suivant la revendication 1, caractérisé en ce que ledit segment détachable (2) est fabriqué en acier de type durable, tel que l'acier inoxydable martensitique.
3. Bloc de broyage suivant la revendication 1, caractérisé en ce que ledit segment détachable (2) est fabriqué en une matière durable non métallique, par exemple une céramique.
4. Bloc de broyage suivant la revendication 1, caractérisé en ce que ledit segment détachable (2) est fabriqué en métal revêtu d'une matière durable, par exemple une céramique.
5. Bloc de broyage suivant l'une des revendications 1 à 4, caractérisé en ce que ledit segment détachable (2) est essentiellement fixé dans le bloc (1) au moyen d'un assemblage à verrouillage de forme.
6. Bloc de broyage suivant l'une des revendications 1 à 4, caractérisé en ce que ledit segment détachable (2) est esentiellement fixé dans le bloc (1) par des moyens de fixation séparés, par exemple des boulons (4).
7. Bloc de broyage suivant l'une des revendications 5 ou 6, caractérisé en ce qu'un milieu adhésif, par exemple une colle, est utilisé pour assurer la fixation solide du segment détachable (2) dans le bloc de broyage.
EP87902533A 1986-05-13 1987-05-05 Bloc de broyage pour raffineur Expired - Lifetime EP0271502B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87902533T ATE62288T1 (de) 1986-05-13 1987-05-05 Schleifblock fuer einen raffineur.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI861986A FI80087C (fi) 1986-05-13 1986-05-13 Malblock vid en raffinoer.
FI861986 1986-05-13

Publications (2)

Publication Number Publication Date
EP0271502A1 EP0271502A1 (fr) 1988-06-22
EP0271502B1 true EP0271502B1 (fr) 1991-04-03

Family

ID=8522605

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87902533A Expired - Lifetime EP0271502B1 (fr) 1986-05-13 1987-05-05 Bloc de broyage pour raffineur

Country Status (6)

Country Link
EP (1) EP0271502B1 (fr)
JP (1) JPS63503469A (fr)
AU (1) AU596422B2 (fr)
FI (1) FI80087C (fr)
NZ (1) NZ220274A (fr)
WO (1) WO1987006963A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5934585A (en) * 1997-05-05 1999-08-10 J & L Fiber Services Inc Refiner plate assembly and method of mounting
FI121793B (fi) * 2009-06-05 2011-04-15 Metso Minerals Inc Menetelmä kulutusosan pinnoittamiseksi, menetelmällä pinnoitetun kulutusosan käyttö, kulutusosa ja jauhin

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3436316A1 (de) * 1983-10-10 1985-04-25 Osakeyhtiö Tampella AB, Tampere Schleifmittel zur herstellung von holzschliff

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3065920A (en) * 1959-01-22 1962-11-27 Bolton John W & Sons Inc Working surfaces for refining engines
AU448376B2 (en) * 1969-09-23 1974-05-02 Pilan-Agus E Refenadores Limitada Process for manufacture of conical and disc sets for paper-pulp refining machines
SE361840B (fr) * 1972-04-13 1973-11-19 Defibrator Ab
BR7205730D0 (pt) * 1972-08-22 1974-04-25 R Pilao Aperfeicoamentos em discos e conicos para refinadoras de polpa para papel e outros
JPS49126901A (fr) * 1973-04-16 1974-12-05
SE413632B (sv) * 1978-03-03 1980-06-16 Defibrator Ab Anordning vid malorgan for malapparater for fibrost, foretredesvis vegetabiliskt material
CA1151926A (fr) * 1979-10-04 1983-08-16 Macmillan Bloedel Limited Disques d'affineur
FI60582C (fi) * 1979-12-21 1983-04-05 Oittivalu Oy Malningsskiva eller -stycke
CA1161291A (fr) * 1981-02-09 1984-01-31 William H. Schafer Pierre segmentaire de broyage
JPS5988958A (ja) * 1982-11-04 1984-05-23 金井　宏之 パルプ解繊用ロ−ル
SE8302013L (sv) * 1983-04-12 1984-10-13 Sunds Defibrator Anordning vid malapparater for raffinering av lignocellulosahaltigt material
BR8304028A (pt) * 1983-07-28 1985-03-05 Milton Pilao Aperfeicoamentos em disco refinador de polpa de madeira ou similar
US4620675A (en) * 1983-09-07 1986-11-04 Beloit Corporation Composite flexible pulp refiner disk

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3436316A1 (de) * 1983-10-10 1985-04-25 Osakeyhtiö Tampella AB, Tampere Schleifmittel zur herstellung von holzschliff

Also Published As

Publication number Publication date
FI80087C (fi) 1990-04-10
EP0271502A1 (fr) 1988-06-22
FI80087B (fi) 1989-12-29
AU596422B2 (en) 1990-05-03
JPS63503469A (ja) 1988-12-15
AU7390987A (en) 1987-12-01
NZ220274A (en) 1988-09-29
FI861986A0 (fi) 1986-05-13
WO1987006963A1 (fr) 1987-11-19
FI861986A (fi) 1987-11-14

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