EP0271502B1 - Grinding block for a refiner - Google Patents
Grinding block for a refiner Download PDFInfo
- 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
Links
- 239000000463 material Substances 0.000 claims abstract description 19
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 12
- 239000010959 steel Substances 0.000 claims abstract description 12
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 3
- 239000010935 stainless steel Substances 0.000 claims abstract description 3
- 239000000919 ceramic Substances 0.000 claims description 6
- 229910000734 martensite Inorganic materials 0.000 claims description 5
- 239000000853 adhesive Substances 0.000 claims description 2
- 230000001070 adhesive effect Effects 0.000 claims description 2
- 239000003292 glue Substances 0.000 claims description 2
- 239000002184 metal Substances 0.000 claims description 2
- 229910052751 metal Inorganic materials 0.000 claims description 2
- 229910052799 carbon Inorganic materials 0.000 abstract description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 4
- 230000035939 shock Effects 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 4
- 238000005266 casting Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000007670 refining Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 229910001018 Cast iron Inorganic materials 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 150000004767 nitrides Chemical class 0.000 description 2
- 239000002023 wood Substances 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 229920001131 Pulp (paper) Polymers 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000005243 fluidization Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000036039 immunity Effects 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 150000007524 organic acids Chemical class 0.000 description 1
- 235000005985 organic acids Nutrition 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
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)
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 (sv) | 1986-05-13 | 1986-05-13 | Malblock vid en raffinör |
| FI861986 | 1986-05-13 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0271502A1 EP0271502A1 (en) | 1988-06-22 |
| EP0271502B1 true EP0271502B1 (en) | 1991-04-03 |
Family
ID=8522605
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP87902533A Expired - Lifetime EP0271502B1 (en) | 1986-05-13 | 1987-05-05 | Grinding block for a refiner |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP0271502B1 (sv) |
| JP (1) | JPS63503469A (sv) |
| AU (1) | AU596422B2 (sv) |
| FI (1) | FI80087C (sv) |
| NZ (1) | NZ220274A (sv) |
| WO (1) | WO1987006963A1 (sv) |
Families Citing this family (2)
| 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 (sv) * | 2009-06-05 | 2011-04-15 | Metso Minerals Inc | Förfarande för ytbeläggning av en slitdel, användning av en med förfarandet belagd slitdel, slitdel och raffinör |
Citations (1)
| 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)
| 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 (sv) * | 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 (sv) * | 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 (en) * | 1979-10-04 | 1983-08-16 | Macmillan Bloedel Limited | Refiner plates |
| FI60582C (fi) * | 1979-12-21 | 1983-04-05 | Oittivalu Oy | Malningsskiva eller -stycke |
| CA1161291A (en) * | 1981-02-09 | 1984-01-31 | William H. Schafer | Segmental pulpstone |
| 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 |
-
1986
- 1986-05-13 FI FI861986A patent/FI80087C/sv not_active IP Right Cessation
-
1987
- 1987-05-05 JP JP62502967A patent/JPS63503469A/ja active Pending
- 1987-05-05 WO PCT/FI1987/000060 patent/WO1987006963A1/en active IP Right Grant
- 1987-05-05 AU AU73909/87A patent/AU596422B2/en not_active Ceased
- 1987-05-05 EP EP87902533A patent/EP0271502B1/en not_active Expired - Lifetime
- 1987-05-12 NZ NZ220274A patent/NZ220274A/xx unknown
Patent Citations (1)
| 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 |
|---|---|
| EP0271502A1 (en) | 1988-06-22 |
| NZ220274A (en) | 1988-09-29 |
| FI80087C (sv) | 1990-04-10 |
| AU7390987A (en) | 1987-12-01 |
| AU596422B2 (en) | 1990-05-03 |
| JPS63503469A (ja) | 1988-12-15 |
| FI861986A0 (fi) | 1986-05-13 |
| FI80087B (fi) | 1989-12-29 |
| FI861986L (fi) | 1987-11-14 |
| WO1987006963A1 (en) | 1987-11-19 |
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