SE517718C2 - Beam for reducing wear in defibrator for preparing pulp, especially pulp used to make fibreboard - Google Patents

Beam for reducing wear in defibrator for preparing pulp, especially pulp used to make fibreboard

Info

Publication number
SE517718C2
SE517718C2 SE9704487A SE9704487A SE517718C2 SE 517718 C2 SE517718 C2 SE 517718C2 SE 9704487 A SE9704487 A SE 9704487A SE 9704487 A SE9704487 A SE 9704487A SE 517718 C2 SE517718 C2 SE 517718C2
Authority
SE
Sweden
Prior art keywords
grinding
boom element
booms
boom
elements
Prior art date
Application number
SE9704487A
Other languages
Swedish (sv)
Other versions
SE9704487D0 (en
SE9704487L (en
Inventor
Nils Virving
Original Assignee
Valmet Fibertech Ab
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 Valmet Fibertech Ab filed Critical Valmet Fibertech Ab
Priority to SE9704487A priority Critical patent/SE517718C2/en
Publication of SE9704487D0 publication Critical patent/SE9704487D0/en
Publication of SE9704487L publication Critical patent/SE9704487L/en
Publication of SE517718C2 publication Critical patent/SE517718C2/en

Links

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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C7/00—Crushing or disintegrating by disc mills
    • B02C7/11—Details
    • B02C7/12—Shape or construction of discs
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
    • D21B1/00—Fibrous raw materials or their mechanical treatment
    • D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
    • D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
    • D21B1/14—Disintegrating in mills

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)

Abstract

A beam is provided for a defibrator containing a pair of grinding bodies (8, 9) that rotate relative to one another, each grinding body being provided with at least one grinding element (14, 15) having grinding surfaces formed by ribs and grooves. Fibrous material is ground in a zone (16) formed in a grinding nip (17) between the grinding elements. The beam comprises a material with a significantly higher abrasion resistance than the rib material and is designed to be placed in the grinding nip, connected with at least one grinding element and at least as high as the ribs. When in place the beam machines the tops of the ribs in the opposing grinding elements.

Description

ve ovø~ ~ u 10 15 20 25 30 517 718 ' o o u e n « | nu 2 Bommarna har en topp med kanter. Vid bearbetningen av fibermaterialet slits bommarna och då framförallt kanterna på bommarnas toppar. I det fall det ena malorganet är stationärt slits oftast dess bommar mest. Detta på grund av att hastig- ¿ hetsskillnaden mellan fibermaterialet och det stationära malorganet är större än hastighetsskillnaden mellan fiberma- terialet och det roterande malorganet. ve ovø ~ ~ u 10 15 20 25 30 517 718 'o o u e n «| now 2 The booms have a top with edges. When processing the fibrous material, the booms wear, and especially the edges of the tops of the booms. In the case where one of the grinding members is stationary, its bars usually wear the most. This is because the speed difference between the fibrous material and the stationary grinding means is greater than the speed difference between the fibrous material and the rotating grinding means.

Slitaget beror framförallt på att sand och andra hårda främmande partiklar följer med fibermaterialet in i malappa- raten och därmed in i malspalten där de upprepade gånger kommer i kontakt med malelementens bommar.The wear is mainly due to sand and other hard foreign particles accompanying the fibrous material into the grinding apparatus and thus into the grinding gap where they repeatedly come into contact with the grinding elements' booms.

Malorganen har normalt en rotationshastighet på upp till 3000 varv per minut relativt varandra och malspalten är normalt ungefär 0,2 till 2 mm. Främmande hårda partiklar med diameter större än malspalten kan därmed åstadkomma stor skada på melelementen, men även mindre partiklar sliter på malelementen.The grinding means normally have a rotational speed of up to 3000 revolutions per minute relative to each other and the grinding gap is normally approximately 0.2 to 2 mm. Foreign hard particles with a diameter larger than the grinding gap can thus cause great damage to the grinding elements, but even smaller particles wear on the grinding elements.

Bommarna blir avrundade och slits i vissa fall ned olik- formigt vilket resulterar i att malspaltens storlek kan variera. Bearbetningsgraden och därmed massakvaliteten är beroende av malspalten vars storlek regleras för att önskad massakvalitet skall uppnås. Pà de ställen där bommarna har slitits minst kan man då få en mycket liten malspalt. Detta medför stor risk för att lignocellulosans fibrer klipps av vilket inte är önskvärt.The booms are rounded and in some cases wear down differently, which results in the size of the grinding gap can vary. The degree of processing and thus the pulp quality depends on the grinding gap, the size of which is regulated in order to achieve the desired pulp quality. In the places where the booms have worn the least, you can then get a very small grinding gap. This entails a great risk that the fibers of the lignocellulose will be cut off, which is not desirable.

Nedslitning av bommar är ett särskilt stort problem vid tillverkning av fiberboardmassa där fibermaterialet ofta innehåller mycket föroreningar som till exempel sten och sand.Barrier wear is a particularly big problem in the manufacture of fiberboard pulp where the fibrous material often contains a lot of contaminants such as stone and sand.

Malelementen mäste bytas ut när de blivit slitna vilket innebär ett driftstopp i processen.The grinding elements must be replaced when they have become worn, which means a downtime in the process.

Föreliggande uppfinning innebär en lösning på ovanstående 10 15 20 25 30 | v ~ « oo 517718 3 problem. Åtminstone ett bomelement, utformat i ett material med betydligt högre slitstyrka än bommarnas material, anord- nas pà åtminstone det ena malorganet. Bomelementet kan anord- nas så att det bearbetar motstàende malelements bommars toppar och därmed skärper dessa och ser till att bommarna relativt varandra har den höjd som önskas. Eftersom bomele- mentet har en betydligt högre slitstyrka än bommarna slits inte detta när bommarna slits och bomelementet kan därmed användas för bearbetning av motstàende bommars toppar.The present invention provides a solution to the above 10 15 20 25 30 | v ~ «oo 517718 3 problem. At least one boom element, formed in a material with significantly higher wear resistance than the material of the booms, is arranged on at least one grinding member. The boom element can be arranged so that it processes the tops of the opposing grinding element barriers and thus sharpens these and ensures that the booms have the desired height relative to each other. Since the boom element has a significantly higher wear resistance than the booms, this does not wear when the booms are worn and the boom element can thus be used for machining the tops of opposing booms.

I det fall bomelementet anordnas att vara högre än omgi- vande bommar fungerar bomelementet som en spärr förbi vilken främmande större partiklar inte kan passera. Partiklarna kan i stället pà grund av centrifugalkraften snabbt ledas ut ur malspalten utefter bomelementet. Partiklarnas uppehållstid i malspalten minskas och därmed minskas slitaget på malelemen- ten.In the event that the boom element is arranged to be higher than the surrounding booms, the boom element functions as a barrier past which foreign larger particles cannot pass. Due to the centrifugal force, the particles can instead be quickly led out of the grinding gap along the boom element. The residence time of the particles in the grinding gap is reduced and thus the wear on the grinding elements is reduced.

I det fall ett malorgan är stationärt och bomelementet skall placeras på endast det ena malorganet, väljs lämpligen det roterande malorganet eftersom det stationära slits mest.In the case where a grinding member is stationary and the boom element is to be placed on only one grinding member, the rotating grinding member is suitably selected since the stationary wear is most worn.

Bearbetningen av motstàende malelements bomtoppar kan antingen ske under malapparatens arbete med bearbetning av fibermaterialet eller vid separata skärparbeten.The machining of opposing grinding element boom tops can take place either during the grinding device's work with processing of the fibrous material or during separate sharpening work.

Uppfinningens närmare kännetecken framgår av patentkra- ven.The more detailed features of the invention appear from the patent claims.

Uppfinningen beskrivs närmare i det följande med hänvis- ning till bifogade figurer som visar en utföringsform.The invention is described in more detail in the following with reference to the accompanying figures which show an embodiment.

Fig 1 visar en genomskärning av en malapparat; Fig 2 visar ett bomelement enligt uppfinningen; Fig 3 visar ett bomelement infäst mellan två malelement.Fig. 1 shows a section of a grinding apparatus; Fig. 2 shows a boom element according to the invention; Fig. 3 shows a boom element attached between two grinding elements.

En malapparat enligt fig 1 innefattar ett malhus 10 i vilket är anordnat ett stationärt malorgan 8 och ett motstà- 10 15 20 25 30 u ~ | n nu v n u ø | u ~ | ao ende roterande malorgan 9 vilket är fäst pà en roterande axel 13. Malorganen 8,9 innefattar vardera en malskiva 11,12 där malskivorna är försedda med malelement 14 respektive 15 med bommar 6 och spår 7 där bommarna har toppar med kanter.A grinding apparatus according to Fig. 1 comprises a grinding housing 10 in which a stationary grinding member 8 and a resistor 10 are arranged. n nu v n u ø | u ~ | a single rotating grinding member 9 which is attached to a rotating shaft 13. The grinding means 8,9 each comprise a grinding disc 11,12 where the grinding discs are provided with grinding elements 14 and 15 respectively with booms 6 and grooves 7 where the booms have peaks with edges.

Malelementen bildar mellan sig en malzon 16 i en malspalt 17.The grinding elements form between them a grinding zone 16 in a grinding gap 17.

Malspalten 17 innefattar även en innanför malzonen 16 belägen inmatningszon 18. Det stationära malorganet 8 är utformat med en central inmatningsöppning 19 för det fibermaterial, i detta exempel lignocellulosahaltigt fibermaterial, som skall bearbetas. Pâ det roterande malorganet 9 är anordnat en central inmatningsanordning 22. En skruvmatare 20 för fiber- materialet är ansluten till inmatningsöppningen 19. Malhuset 10 är även försett med ett utlopp 21 för det genom malspalten passerande fibermaterialet som då bearbetats till massa. Det fibermaterial som skall bearbetas matas fram till malappara- ten med hjälp av skruvmataren 20. Ingen egentlig mekanisk bearbetning sker i inmatningszonen 18 utan den sker i malzo- nen 16.The grinding gap 17 also comprises an feed zone 18 located inside the grinding zone 16. The stationary grinding member 8 is formed with a central feed opening 19 for the fibrous material, in this example lignocellulosic fibrous material, which is to be processed. A central feeding device 22 is arranged on the rotating grinding member 9. A screw feeder 20 for the fibrous material is connected to the feeding opening 19. The grinding housing 10 is also provided with an outlet 21 for the fibrous material passing through the grinding gap which is then processed into pulp. The fibrous material to be processed is fed to the grinding apparatus by means of the screw feeder 20. No actual mechanical processing takes place in the feed zone 18 but takes place in the grinding zone 16.

Ett bomelement 1 enligt figur 2 innefattar en bomelement- kropp 2 med en bomelementtopp 3 vilken har åtminstone en bomelementkant 4. Bomelementet innefattar även lämpligen en bottendel 5 för fastsättning av bomelementet 1 på malorganet.A boom element 1 according to figure 2 comprises a boom element body 2 with a boom element top 3 which has at least one boom element edge 4. The boom element also suitably comprises a bottom part 5 for attaching the boom element 1 to the grinding member.

Bomelementet 1 är utformat i ett material med betydligt högre slitstyrka än bommarnas 6 material. Bomelementet 1 skall ha en så hög slitstyrka att det i huvudsak inte slites av främ- mande partiklar som sand och grus. Lämpligt material är hàrdmetall. Åtminstone ett bomelement 1 infästes, exempelvis som i fig 3, mellan tvâ malelement 15 pà åtminstonde ett malorgan och då lämpligen det roterande malorganet 9. Bomelementet 1 I det fall malelemen- kan även integreras i malelementet 15. tet 15 är gjutet kan bomelementet 1 i samband med gjutningen 10 15 20 25 517 718 v nu | a n e n anordnas i malelementet 15.The boom element 1 is formed in a material with significantly higher wear resistance than the material of the booms 6. The boom element 1 must have such a high wear resistance that it is mainly not worn by foreign particles such as sand and gravel. Suitable material is cemented carbide. At least one boom element 1 is fastened, for example as in Fig. 3, between two grinding elements 15 on at least one grinding member and then suitably the rotating grinding member 9. In the case of the grinding element 1 the grinding element can also be integrated in the grinding element 15. in connection with the casting 10 15 20 25 517 718 v now | a n e n is arranged in the grinding element 15.

Bomelementet 1 kan vara någon tiondel högre än omgivande bommar 6 och anordnas så att det bildar en spärr förbi vilken främmande större partiklar inte kan passera, utan i stället ledes ut ur malspalten. Bomelementet 1 kan ha en bàgformad eller rak utformning och sträcker sig lämpligen huvudsakligen i radiell riktning på malorganet 9. Den bàgformade utform- ningen skall vara sà att den underlättar utförseln av de främmande partiklarna ur malspalten.The boom element 1 can be a tenth higher than the surrounding booms 6 and is arranged so that it forms a barrier past which foreign larger particles cannot pass, but instead are led out of the grinding gap. The boom element 1 can have an arcuate or straight design and suitably extends mainly in the radial direction on the grinding member 9. The arcuate design should be such that it facilitates the removal of the foreign particles from the grinding gap.

Bomelementet 1 kan till exempel ha sin utsträckning genom hela inmatningszonen 18 och vidare genom hela malzonen 16 eller ha sin utsträckning enbart i malzonen 16. Bomelementet 1 kan anordnas så att det bearbetar motstáende malorgans 8 malelements 14 bommars 6 toppar när malorganet 9 roterar.The boom element 1 can for instance have its extension through the entire feed zone 18 and further through the entire grinding zone 16 or have its extension only in the grinding zone 16. The boom element 1 can be arranged so that it processes the grinding elements 6 of opposite grinding member 8 when the grinding member 9 rotates.

Bomelementet 1 kan även utformas att vara lika högt som omgivande bommar 6. När malapparaten arbetar slits omgivande bommar 6 medan bomelementet 1 är i huvudsak opàverkat. Bom- elementet 1 kommer därmed att när omgivande bommar har sli- tits i förhållande till dessa vara högre och därmed kunna användas för bearbetning av motstáende malorgans 8 malele- ments 14 bomtoppar 6.The boom element 1 can also be designed to be as high as the surrounding booms 6. When the grinding device is operating, the surrounding booms 6 wear while the boom element 1 is substantially unaffected. The boom element 1 will thus, when the surrounding booms have been worn in relation to these, be higher and thus be able to be used for machining the opposing grinding member 8 grinding elements 14 boom tops 6.

Bearbetningen av motstáende 8 malelements 14 bomtoppar kan ske i samband med att malapparaten arbetar med bearbet- ning av fibermaterialet eller till exempel vid speciella skärparbeten då malapparaten matas med exempelvis vatten.The machining of opposing 8 grinding elements 14 boom tops can take place in connection with the grinding apparatus working with machining of the fibrous material or, for example, during special sharpening work when the grinding apparatus is fed with, for example, water.

Uppfinningen är givetvis inte begränsad till den visade utföringsformen utan kan varieras inom ramen för patentkraven med hänsyn till beskrivning och figurer.The invention is of course not limited to the embodiment shown but can be varied within the scope of the claims with regard to description and figures.

Claims (6)

10 15 20 25 30 517 718 =::§=::§.;"; -2 6 P a t e n t k r a v10 15 20 25 30 517 718 = :: § = :: § .; "; -2 6 P a t e n t k r a v 1. Bomelement avsett för malapparat med ett par motstående relativt varandra roterande och samverkande malorgan (8,9) (8,9) ett malelement (14,15) vilket är utformat med malytor med bommar (6) (7) (14,15) sig bildar en malspalt (17) med en malzon (16) för där varje malorgan innefattar åtminstone och spår och där malelementen mellan bearbetning av fibermaterial, k ä n n e t e c k n a t a v att bomelementet (1) är uformat i ett material med betydligt högre slitstyrka än bommarnas (6) material samt att bomelementet (1) är avsett att placeras i malspalten (17) i anslutning till åtminstone ett malelement (l4,l5) och är avsett att i malapparaten vara åtminsone lika högt som bommarna (6) samt utformat att bearbeta motstàende malelements (l4,l5) bommars (6) toppar.Boom element intended for grinding apparatus with a pair of opposite relatively rotating and cooperating grinding members (8,9) (8,9) a grinding element (14,15) which is formed with grinding surfaces with booms (6) (7) (14,15 ) forms a grinding gap (17) with a grinding zone (16) for where each grinding means comprises at least and grooves and where the grinding elements between processing fibrous material, characterized in that the boom element (1) is unformed in a material with significantly higher wear resistance than the booms ( 6) material and that the boom element (1) is intended to be placed in the grinding gap (17) adjacent to at least one grinding element (l4, l5) and is intended to be at least as high in the grinding apparatus as the booms (6) and designed to process opposing grinding elements (l4, l5) bommars (6) tops. 2. Bomelement enligt krav 1, k ä n n e t e c k n a t a v att bomelementet (1) är integrerat i ett malelement (l4,l5).Boom element according to claim 1, characterized in that the boom element (1) is integrated in a grinding element (l4, l5). 3. Bomelement enligt krav 1 eller 2, k ä n n e t e c k n a t a v att bomelementet (1) är anordnat att infästas mellan två malelement (14 respektive 15).3. A boom element according to claim 1 or 2, characterized in that the boom element (1) is arranged to be fastened between two grinding elements (14 and 15, respectively). 4. Bomelement enligt något av ovanstående krav, k ä n n e t e c k n a t a v att bomelementet (1) är avsett att sträcka sig åtminstone längs hela malzonen (16).Boom element according to one of the preceding claims, characterized in that the boom element (1) is intended to extend at least along the entire grinding zone (16). 5. Bomelement enligt krav 4, k ä n n e t e c k n a-t a v att bomelementet (1) i sin längdriktning är bågformat.Boom element according to Claim 4, characterized in that the boom element (1) is arcuate in its longitudinal direction. 6. Bomelement enligt krav 4 eller 5 k ä n n e t e c k n a t a v att bomelementet (1) är utformat att i malapparaten vara högre än bommarna (6).Boom element according to Claim 4 or 5, characterized in that the boom element (1) is designed to be higher than the booms (6) in the milling apparatus.
SE9704487A 1997-12-02 1997-12-02 Beam for reducing wear in defibrator for preparing pulp, especially pulp used to make fibreboard SE517718C2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SE9704487A SE517718C2 (en) 1997-12-02 1997-12-02 Beam for reducing wear in defibrator for preparing pulp, especially pulp used to make fibreboard

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE9704487A SE517718C2 (en) 1997-12-02 1997-12-02 Beam for reducing wear in defibrator for preparing pulp, especially pulp used to make fibreboard

Publications (3)

Publication Number Publication Date
SE9704487D0 SE9704487D0 (en) 1997-12-02
SE9704487L SE9704487L (en) 1999-06-03
SE517718C2 true SE517718C2 (en) 2002-07-09

Family

ID=20409231

Family Applications (1)

Application Number Title Priority Date Filing Date
SE9704487A SE517718C2 (en) 1997-12-02 1997-12-02 Beam for reducing wear in defibrator for preparing pulp, especially pulp used to make fibreboard

Country Status (1)

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SE (1) SE517718C2 (en)

Also Published As

Publication number Publication date
SE9704487D0 (en) 1997-12-02
SE9704487L (en) 1999-06-03

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