EP4217535A1 - Segment de plaque de raffineur - Google Patents

Segment de plaque de raffineur

Info

Publication number
EP4217535A1
EP4217535A1 EP21735649.2A EP21735649A EP4217535A1 EP 4217535 A1 EP4217535 A1 EP 4217535A1 EP 21735649 A EP21735649 A EP 21735649A EP 4217535 A1 EP4217535 A1 EP 4217535A1
Authority
EP
European Patent Office
Prior art keywords
channels
grinding
fitting
grinding gap
gap
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.)
Pending
Application number
EP21735649.2A
Other languages
German (de)
English (en)
Inventor
Marcel Schmid
Martin Schmid
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.)
Voith Patent GmbH
Original Assignee
Voith Patent GmbH
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 Voith Patent GmbH filed Critical Voith Patent GmbH
Publication of EP4217535A1 publication Critical patent/EP4217535A1/fr
Pending 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
    • 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
    • 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 invention relates to a clothing for beating aqueous suspended fibrous material in a grinding gap delimited by two treatment surfaces formed by clothings that rotate relative to one another, consisting of a base body with elongated treatment elements pointing towards the grinding gap and grooves running in between, with a large number of channels in the base body are arranged.
  • the invention also includes a device for beating aqueous suspended fibrous material in a beating gap delimited by two treatment surfaces which rotate relative to one another and are formed by clothings.
  • Such machines generally have at least one rotor and at least one stator with either disc-shaped or cone-shaped treatment surfaces on which the clothings are placed so that grinding gaps can form between them.
  • the sets have webs and grooves on the treatment surfaces, which is why one also speaks of "knife sets".
  • the sets are exposed to a high level of wear and tear and must therefore be replaced at certain intervals. Wear can also lead to a change in the machining effect during the service life.
  • DE 10 2004 016 661 A1 proposes assembling the fittings from a plurality of elements and then welding or soldering them to one another.
  • the object of the invention is to extend the service life of such clothings while grinding as efficiently as possible.
  • the object is achieved in that the channels in the base body run inclined or curved towards the grinding gap, at least in sections, and at least some of the channels open into the grinding gap.
  • the treatment elements also belong to the base body.
  • the treatment elements and/or the channels should run radially with at least one directional component.
  • the two ends of the channels are generally considered to be the orifice openings, regardless of the direction of flow in the channels. Ends of the channels which are only opened in the course of wear are also regarded as openings.
  • the channels are preferably curved or inclined in the radial direction, at least in sections, towards the refining gap, so that pulp is conveyed in a targeted manner into the refining surface via these channels.
  • pulp is conveyed away from the refining surface via these channels.
  • the outlet openings of several channels in the refining gap can be at the same distance from the axis of rotation and/or at different distances from the axis of rotation of the rotating treatment surface .
  • the angle of inclination of the channels to the milling gap is between 3 and 30°, preferably between 5 and 20°, viewed over their radial extent lies.
  • the majority, preferably all of the channels that are curved or inclined in relation to the grinding gap only extend over a radial section of the grinding gap.
  • at least some of the channels preferably run radially from the radially outer or inner end of the treatment area or the set to an inner section of the treatment area.
  • These radially short channels also allow larger angles of inclination of the channels to the grinding gap.
  • the radially inner end of the channels has, at least on one side lying in the circumferential direction, an orifice opening that is continuously enlarged radially inward.
  • the inflow of the fibrous stock suspension into the respective channel can be supported via this opening design.
  • the channels should be at different distances from the grinding gap and/or there should be several channels one above the other in the base body, which can significantly increase the service life of the set.
  • channels should at least partially overlap one another or with the bottom of the groove viewed in the direction of rotation. If the treatment elements are completely removed during operation as a result of wear, this simultaneously leads to the opening of the channels, which partially overlap with the groove base in the direction of rotation. The removal of the wall of these channels facing the grinding gap means that these channels now function as a groove and the surface lying between the opened channels as a treatment element.
  • the width of the channels should essentially correspond to the width of the grooves and/or the width of the wall between adjacent channels in the direction of rotation should essentially correspond to the width of the treatment elements.
  • the channels are inclined or curved radially outwards, for example towards the milling gap, then the channels first open radially outwards in the event of wear.
  • the design and/or arrangement of the channels of the treatment surface, the set or a zone thereof is selected in such a way that the open surface of the grooves and/or the length of the cutting edge remains approximately the same over the entire service life, so that the pumping behavior also remains constant over the entire service life stays about the same.
  • the groove bottoms of adjacent grooves are at different depths.
  • the adjacent grooves have different depths not only in the initial state but also during wear.
  • the grooves should at least predominantly have a constant width and/or the width of the treatment elements should at least predominantly be of the same size.
  • the width of the treatment elements is between 0.1 and 1.5 mm and/or the height of the treatment elements is less than 5 mm.
  • the elongate treatment elements and the channels advantageously run unevenly, at least in sections.
  • the mostly circular or circular ring-shaped treatment areas are usually composed of several clothing segments. However, the set can also be made in one piece.
  • the circular diameter of the base body should be between 35 and 150 cm.
  • the average number and the total width of the treatment elements can be kept constant.
  • the channels in the base body for the grinding gap are at least partially inclined or curved in both treatment areas and at least some of the channels open into the grinding gap.
  • the channels in the base body are inclined or curved towards the grinding gap at least in sections for only one treatment area and at least some of the channels open into the grinding gap.
  • the construction is particularly simple if the base body of the opposite, non-rotating treatment surface has no channels. Does the main body of the opposite, non-rotating treatment surface have channels which are at least approximately parallel to the grinding surface run, the pulp can be fed back radially inwards via these channels.
  • the treatment elements are applied at least partially, preferably completely and advantageously also the base body at least partially in layers from one or more liquid and/or pasty and/or solid materials and a physical or subjected to chemical hardening or melting process. Sintering is also included in this hardening or melting process.
  • the material and shape of the treatment elements and the channels can be more easily and comprehensively adapted to the special requirements.
  • shrinkage of up to 30% can occur depending on the material applied and the special hardening or melting process.
  • the material applied in layers should be in powder form and/or comprise one or more metals or metal compounds.
  • the material applied in layers is sintered or fused by means of a laser.
  • Ceramic layers can also be produced in this way.
  • the surface roughness of the treatment element can be influenced via the grain size of the powder.
  • FIG. 1 shows a schematic cross section through a grinding arrangement
  • FIG. 2 a plan view of a clothing segment 2 of the grinding arrangement
  • FIG. 3 a partial cross section through two adjacent clothing segments 2;
  • FIG. 4 a partial cross section through another clothing segment 2;
  • FIGS. 5a-c partial longitudinal sections through various grinding devices
  • Figures 6a and b differently designed outlet openings of the channels 8 and Figure 7: a side view according to Figure 4.
  • a grinding gap 3 is formed in the housing of the grinding arrangement by a stationary grinding surface coupled to the housing and a grinding surface rotating about an axis of rotation 10 .
  • the two annular grinding surfaces run parallel to one another, with the distance between them usually being adjustable.
  • conical or cylindrical treatment surfaces are also possible.
  • the rotating grinding surface is moved in the direction of rotation by a shaft that is rotatably mounted in the housing.
  • This shaft is driven by a drive that is also present in the housing, for example.
  • the fiber suspension 1 to be ground reaches the grinding gap 3 between the two grinding surfaces via an inlet through the center.
  • feeding through openings in the grinding surface is also possible.
  • the fiber suspension 1 passes the interacting beating surfaces radially outwards and leaves the adjoining annular space through an outlet.
  • Both grinding surfaces are each formed by a set 2 consisting of a plurality of grinding set segments 2 in the form of segments of a circle or ring segment, as shown in FIG.
  • the clothing segments 2 are each formed by a base body 4 in the form of a base plate with a multiplicity of essentially radially running, strip-shaped treatment elements 5 and grooves 6 in between.
  • the treatment elements 5 have an elongated cross-sectional shape parallel to the base plate, with the upper side of the treatment elements 5 pointing towards the treatment gap 3 generally running parallel to the outer surface of the base body 4 .
  • the treatment elements 5 In order to optimize their arrangement and their effect, the treatment elements 5 often run unevenly, i.e. curved, wavy or kinked, as can be seen in FIG. 2, at least over a radial section.
  • the base body 4 with its treatment elements 5 is applied completely in layers from a liquid, pasty or solid material and is thereby subjected to a physical or chemical hardening or melting process.
  • the layered application of powdered material which comprises ceramics or one or more metals or metal compounds, is particularly suitable.
  • This material which is applied in layers, can then be laser-sintered or fused after each layer or bonded with a binder in a first step and later sintered (binder jetting process). In the latter process, the binder evaporates.
  • the arrangement of the treatment elements 5 on the base body 4 can be selected as required.
  • the circular diameter of the base body 4 is between 35 and 150 cm.
  • this base body 4 is made much easier by applying it in layers.
  • the grooves 6 have at least predominantly a constant width.
  • the width of the treatment elements 5 also remains at least largely the same in the radial direction 7 .
  • the width of the channels 8 essentially corresponds to the width of the grooves 6 and the width of the wall 9 between adjacent channels 8 in the direction of rotation 11 essentially corresponds to the width of the treatment elements 5.
  • the number of open channels 8 is as high as possible and remains as constant as possible during wear of the base body 4 .
  • the adjacent channels 8 in the direction of rotation 11 are offset from one another in such a way that the adjacent channels 8 partially overlap in the direction of rotation 11, so that when a wall 9 is completely removed, the adjacent channel 8 located axially below is opened.
  • the height of the treatment elements 5 is below 3 mm, for example, and the width of the treatment elements 5 is between 0.1 and 1 mm.
  • the cross sections of the channels 8 of adjacent clothing segments 2 can also differ. While the channels 8 of a clothing segment 2 are circular, the channels 8 of the adjacent clothing segment 2 have an elliptical cross-section here, for example.
  • the clothing or clothing segments 2 themselves to have differently designed zones, with the channels 8 of these zones being arranged and/or designed differently.
  • FIG. 2 shows feed channels 12 which reach radially outwards into the beating surface and support the feed of fiber suspension 1 into the beating gap 3 due to the lack of treatment elements 5 .
  • this side should point in the flow direction of the fibrous stock suspension 1 .
  • this side points counter to the direction of rotation 11 of the opposite, rotating grinding surface.
  • FIGS. 4 and 7 show axially offset channels 8 with a rectangular cross section.
  • the goal is to ensure the same open groove area and cutting edge length in every state of wear.
  • the adjacent grooves 6 have different depths in the initial state and during wear.
  • the channels 8 of the clothing segments 2 according to the invention in the base body 4 run here continuously inclined to the grinding gap 3, with at least some of these channels 8 at least after their opening due to wear flow into the milling gap 3.
  • the opening of several channels 8 in the grinding gap 3 can have the same distance or else different distances from the axis of rotation 10 of the rotating treatment surface of this grinding gap 3 .
  • the angle of inclination of the channels 8 to the grinding gap 3 is between 5 and 20° over their radial extent.
  • the channels 8 that are curved or inclined towards the grinding gap 3 only extend over a radial section of the grinding gap 3.
  • Figures 5 ac show a grinding device for grinding aqueous suspended fibrous material 1 in a grinding gap 3 delimited by two treatment surfaces which rotate relative to one another and are formed by clothing segments 2.
  • channels 8 are present in the base body 4 for both treatment areas. However, these run parallel to the refining gap 3 in the non-rotating treatment surface. At least part of the already treated fibrous suspension 1 can be guided radially inward again via these parallel channels 8 and pass through the refining gap 3 again. In the case of the opposite, rotating treatment surface, the channels 8 are inclined towards the refining gap 3 and open into the refining gap 3. The supply of fibrous material into the refining gap 3 can thus be supported.
  • FIG. 5b shows an embodiment in which the channels 8 in the base body 4 run inclined towards the grinding gap 3 and open into the grinding gap 3 in both treatment surfaces.
  • the angle of inclination and the width of the channels 8 are of different sizes.
  • the grinding device according to FIG. 5c has only one, preferably rotating, treatment surface, in which the channels 8 in the base body 4 are inclined toward the grinding gap 3 and open into it.
  • the base body 4 of the opposite, non-rotating treatment surface has no channels 8.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)

Abstract

L'invention porte sur un segment de plaque (2) pour le raffinage d'une matière fibreuse (1) en suspension aqueuse dans un espace de raffinage (3) délimité par deux surfaces de traitement qui tournent l'une par rapport à l'autre et qui sont formées par des segments de plaque (2). Le segment de plaque se compose d'un corps principal (4) doté d'éléments de traitement allongés (5) faisant face à l'espace de raffinage (3) et de rainures (6) s'étendant entre les éléments de traitement, une pluralité de canaux (8) étant disposée dans le corps principal (4). La durée de vie des segments de plaque peut être prolongée par le fait que les canaux (8) s'étendent dans le corps principal (4), au moins dans certaines sections, de manière inclinée ou incurvée par rapport à l'espace de raffinage (3), au moins une partie des canaux (8) débouchant dans l'espace de raffinage (3).
EP21735649.2A 2020-09-24 2021-06-22 Segment de plaque de raffineur Pending EP4217535A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102020124895.4A DE102020124895A1 (de) 2020-09-24 2020-09-24 Mahlgarnitursegment
PCT/EP2021/066907 WO2022063450A1 (fr) 2020-09-24 2021-06-22 Segment de plaque de raffineur

Publications (1)

Publication Number Publication Date
EP4217535A1 true EP4217535A1 (fr) 2023-08-02

Family

ID=76662480

Family Applications (1)

Application Number Title Priority Date Filing Date
EP21735649.2A Pending EP4217535A1 (fr) 2020-09-24 2021-06-22 Segment de plaque de raffineur

Country Status (3)

Country Link
EP (1) EP4217535A1 (fr)
DE (1) DE102020124895A1 (fr)
WO (1) WO2022063450A1 (fr)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004016661A1 (de) 2004-04-05 2005-10-20 Voith Paper Patent Gmbh Verfahren zur Herstellung von Garnituren für das mechanische Bearbeiten, insb. Mahlen von wasserhaltigenm Papierstoff
DE102015207536A1 (de) * 2015-04-24 2016-10-27 Voith Patent Gmbh Behandlungsgarnitur
DE102019104105B3 (de) 2019-02-19 2020-06-18 Voith Patent Gmbh Mahlgarnitursegment

Also Published As

Publication number Publication date
DE102020124895A1 (de) 2022-03-24
WO2022063450A1 (fr) 2022-03-31

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