EP4217536A1 - Segment de garniture de raffinage - Google Patents

Segment de garniture de raffinage

Info

Publication number
EP4217536A1
EP4217536A1 EP21777713.5A EP21777713A EP4217536A1 EP 4217536 A1 EP4217536 A1 EP 4217536A1 EP 21777713 A EP21777713 A EP 21777713A EP 4217536 A1 EP4217536 A1 EP 4217536A1
Authority
EP
European Patent Office
Prior art keywords
channels
fitting
gap
grinding
treatment
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
EP21777713.5A
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 EP4217536A1 publication Critical patent/EP4217536A1/fr
Pending legal-status Critical Current

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

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 one or more 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.
  • a grinding arrangement is known from DE 10 2018 133 114 A1.
  • backflow channels are provided for recycling fiber suspension. These return channels are provided to allow recycled fiber suspension to pass through the refining surface multiple times. This ensures that the return does not take place in the treatment gap, but in the supply of the fiber suspension.
  • These backflow channels can be provided with a valve to regulate the backflow.
  • These backflow channels are formed in a stationary grinding surface. Otherwise, the fiber suspension would have to be returned against the centrifugal force caused by the rotation.
  • Backflow channels are preferably arranged between adjacent grinding segments if the grinding surface consists of a large number of grinding segments arranged next to one another in the circumferential direction.
  • EP 3 398 682 A1 discloses a method for producing beating sets for treating fibrous material.
  • the set consists of a base body and treatment elements facing the gap.
  • the treatment elements were applied in layers to the base body.
  • the treatment elements have a profile with ridges and recesses. Lateral webs can be of different strength depending on the direction of rotation and depending on a rotating or fixed arrangement.
  • the object of the invention is to extend the service life of such clothing while grinding as efficiently as possible.
  • the object was achieved in that the channels are closed in at least one position in the radial direction.
  • 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.
  • Short-circuit currents can be avoided by closing a channel.
  • Short-circuit flow is understood to mean the flow of the suspension without passing through the milling gap.
  • grinding gaps are opened and grinding gaps are still closed for opening at a later point in time.
  • the end of the channel on the inflow side is closed, so that the inflow into these channels then takes place via the grinding surface. If the channels are closed downstream or in a radially intermediate position, these channels can fill with fiber suspension, but flow through is prevented.
  • a barrier wall can be designed in several parts.
  • the covers are fastened on the side facing the milling gap. If this attachment is loosened due to wear, the cover is released and the channel is released for an inflow via this side.
  • a further embodiment provides for the cover to be designed in multiple parts.
  • the components of the lid that get into the fiber suspension by loosening the lid become smaller in their dimensions.
  • strips or rod elements have proven to be suitable as cover parts.
  • the channel can be sealed by a fleece layer forming in front of the parts of the cover. As a result, the non-fiber components that get into the suspension due to the loosening of the lid components can be reduced.
  • a short-circuit flow of the fibrous suspension in the channels that are still closed can also be achieved by filling them with a porous or abrasion-sensitive material. If these channels open as a result of wear, the fiber suspension flowing in the refining gap causes the porous material to be discharged or, via abrasion, the abrasion-sensitive material to be removed from the channels.
  • the closure of a channel end can be particularly advantageous if this channel end is located on the side of a segment of the clothing in or against the direction of rotation or on the radially inner side of the clothing or in the area of a fastening means of the clothing.
  • the stability of the channels that are still closed can be increased, which can be advantageous because of the sometimes thin walls between them and the considerable pressures in the grinding gap.
  • the treatment elements are completely removed during operation as a result of wear. At the same time, this leads to the opening of the channels, which partially overlap with the bottom of the groove 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. Therefore, 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 should each run at least approximately parallel to at least one elongate treatment element lying axially approximately above it.
  • the channels run at least approximately parallel to the milling gap.
  • the channels should be at different distances from the grinding gap and/or there should be several channels lying one above the other in the base body.
  • the base body should have several planes one above the other and at least approximately parallel to the grinding gap, each with several channels.
  • the channels of adjacent planes should be offset from one another in the direction of rotation in such a way that they partially overlap in the direction of rotation.
  • the channels in the base body run inclined or curved towards the grinding gap, at least in sections. If the channels are inclined or curved radially outwards towards the milling gap, then the channels first open radially outwards in the event of wear. For guiding the flow into and out of the milling gap and for the grooves formed by the channels as they wear, it has proven to be optimal if 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 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 different distances from the axis of rotation of the rotating treatment surface .
  • 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 from the radially outer or inner end of the treatment area or of the clothing segment radially to an inner section of the treatment area.
  • channels should at least partially overlap one another or 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 design and/or arrangement of the channels of the treatment surface, the set or a zone thereof is chosen in such a way that the open area of the grooves and/or the cutting edge length throughout the service life remains approximately the same, so that the pumping behavior also remains approximately the same over the entire service life.
  • 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 radially inner end of the channels has, at least on one side of the channel in the circumferential direction, an orifice that continuously enlarges radially inward.
  • the inflow of the fibrous stock suspension into the respective channel can be supported via this opening design.
  • 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 channels of adjacent clothing segments can be advantageous to design the channels of adjacent clothing segments differently to arrange and / or form, so that a sufficiently large number of channels is open in each state of wear.
  • the average number and the total width of the treatment elements can be kept constant.
  • the treatment elements are at least partially, preferably completely and advantageously also the base body at least partially applied in layers from one or more liquid and/or pasty and/or solid materials and a physical or subjected to chemical hardening or melting processes. 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. It must be noted that depending on the material applied and the special hardening or melting process, shrinkage of up to 30% can occur.
  • 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.
  • prefabricated channel elements can be assembled to form a set.
  • the channels with the set connected to the support body that can be driven in rotation are designed to be inclined towards the grinding gap.
  • the fiber suspension is conveyed into the beating gap by the inclination and by the centrifugal force acting on it.
  • the channels in the set connected to the axially displaceable support body run parallel to the milling gap. A short-circuit flow of the fiber suspension is prevented by the one-sided closure of the channels.
  • 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;
  • FIG. 5 a side view of a clothing segment 2 with inclined channels 8;
  • FIG. 6 a partial longitudinal section through a grinding device
  • FIG. 7 a partial view of an inflow area of the grinding gap 3 with a radially inner blocking wall
  • FIGS. 8a and b differently designed outlet openings of the channels 8 and FIG. 9: a plan view of the fastening area of a clothing segment 2 with a blocking wall
  • FIG. 10 Section of a fitting with covers for closing channels
  • FIG. 11 Section of a fitting with a multi-part cover for closing channels.
  • 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 11 by a shaft 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 circular segments or ring segments according to FIG.
  • the fitting segments 2 are fastened to a support body 16 which is connected to the housing or is coupled to the drive shaft, as shown in FIG. 1, using fastening means 15 here in the form of screws.
  • 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 materials can be chosen according to the specific demands and requirements.
  • 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.
  • prefabricated channels can also be used to form the set, which are connected to one another to form a set.
  • prefabricated sheet metal ducts can be used. The sheet metal ducts can already be provided with covers, as shown in particular in FIG.
  • the base body 4 there are a large number of channels 8 which run radially at least with one directional component and are at different distances from the grinding gap 3 and which partially overlap one another or the groove base when viewed in the direction of rotation 11 .
  • the production of 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.
  • FIGS. 4, 5, 6 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. It is essential here that the adjacent grooves 6 have different depths in the initial state and during wear.
  • 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 .
  • these have, in particular if their radially inner end is in the radially inner inlet area of the grinding surface, on one ( Figure 8b) or on both (8a) of the channel sides in the circumferential direction, a continuous radially inward direction enlarging orifice. If the opening is only enlarged on one side of the channel in the circumferential direction, this side should point in the direction of flow of the fibrous stock suspension 1 . In the case of a rotating grinding surface, this is the side pointing in the direction of rotation 11, as shown in FIG. 8b. In the case of a non-rotating grinding surface, this side points counter to the direction of rotation 11 of the opposite, rotating grinding surface.
  • the channels 8 should each run at least approximately parallel to an elongate treatment element 5 lying axially approximately above it.
  • a large number of channels 8 are arranged in the base body 4, which run at least with a directional component radially and parallel to the grinding gap 3 and are at different distances from the grinding gap 3, and which partially overlap one another or with the bottom of the groove viewed in the direction of rotation 11.
  • each plane 13 there are several planes 13 , one above the other and parallel to the milling gap 3 , each with a plurality of channels 8 .
  • the levels 13 shown in FIG. 3 run through the center of the channels 8 lying in the axial direction.
  • the channels 8 of adjacent levels 13 are offset in the direction of rotation 11 with respect to one another arranged, FIG. 4.
  • the channels 8 of adjacent planes 13 partially overlap in the direction of rotation 11, so that when a wall 9 is completely removed, the adjacent channel 8 lying axially below it is opened.
  • At least part of the planes 13 of two adjacent clothing segments 2 can be at different distances from the grinding gap 3 .
  • the channels 8 in the embodiment according to FIG 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 toward the grinding gap 3 only extend over a radial section of the grinding gap 3. With a slight inclination of 5°, as can be seen in FIG. 5, the channels 8 are correspondingly longer.
  • Figures 6 and 7 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 clothings or clothing segments 2.
  • channels 8 are present in the base body 4 for both treatment areas. However, these run with the preferably non-rotating Treatment surface parallel to the refining gap 3. With the rotating treatment surface, the channels 8 are inclined toward 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. 7 shows an embodiment in which the channels 8 in the base body 4 run parallel to the milling gap 3 on both treatment surfaces.
  • FIG. 7 shows an embodiment in which the channels 8 beginning on the radially inner side of the clothing or clothing segment 2 of both opposite treatment surfaces are each closed by a blocking wall 14 .
  • the treatment surfaces begin offset in the radial direction 7 relative to one another. Accordingly, the fibrous material 1 can flow over the barrier wall 14 of the treatment area beginning first into the refining gap 3 and the grooves 6 of this treatment area.
  • individual elements for wear removal can be provided in the radially inner area of the clothing starting further radially on the outside.
  • the channels 8 beginning on the sides of the clothing segment 2 lying in or counter to the direction of rotation 11 can also be closed with a blocking wall 14 .
  • the fittings or fitting segments 2 usually have recesses in the area of the fastening means 15 .
  • the fastening means 15 of the clothing segment 2 and running radially outwards are also closed by means of a blocking wall 14 .
  • a short-circuit flow can also be prevented by the channels 8 being at least partially, preferably completely, filled with a porous or abrasion-sensitive material.
  • a porous or abrasion-sensitive material is relatively simple, in particular in the production of the base body 4 by means of layered application.
  • the porous material increases the stability of the channels.
  • Covers 17 are provided in FIG. 10 for closing one channel 8 each, which are mainly fastened on the side facing the milling gap 3 . If this attachment point of the lid is removed through wear, the channel 8 opens and the lid 17 becomes part of the fiber suspension.
  • the cover 17 is designed in several parts with a plurality of rods 18 .
  • These rods 18 are arranged at a distance from one another, with the fibers of the fiber suspension forming a flow layer in front of the rods 18 during operation.
  • the rods 18 are also mainly fastened on the side facing the grinding gap 3, so that when this connection point 19 is loosened, the respective channel 8 is opened. Due to the rods 18 as part of the cover 17, significantly less non-fiber material gets into the suspension in relation to the dimensions and their proportion.
  • the rods are also less disruptive in terms of possible damage to the treatment devices due to their significantly smaller dimensions. reference list

Landscapes

  • Treatment Of Fiber Materials (AREA)

Abstract

L'invention concerne une garniture (2) conçue pour raffiner une matière fibreuse (1) en suspension aqueuse dans un espace de raffinage (3) délimité par deux surfaces de traitement formées par des garnitures (2) et effectuant un mouvement rotatif l'une par rapport à l'autre, comprenant un corps de base (4) comportant des éléments de traitement (5) allongés orientés vers l'espace de raffinage (3) et des rainures (6) s'étendant entre ces éléments de traitement, une pluralité de canaux (8) étant agencée dans le corps de base (4). L'invention vise à améliorer l'efficacité et la durée de vie des garnitures par le fait que les canaux (8) sont fermés sur au moins une extrémité et/ou remplis au moins en partie d'un matériau poreux ou sensible à l'abrasion.
EP21777713.5A 2020-09-24 2021-09-15 Segment de garniture de raffinage Pending EP4217536A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102020124891 2020-09-24
PCT/EP2021/075270 WO2022063643A1 (fr) 2020-09-24 2021-09-15 Segment de garniture de raffinage

Publications (1)

Publication Number Publication Date
EP4217536A1 true EP4217536A1 (fr) 2023-08-02

Family

ID=77914338

Family Applications (1)

Application Number Title Priority Date Filing Date
EP21777713.5A Pending EP4217536A1 (fr) 2020-09-24 2021-09-15 Segment de garniture de raffinage

Country Status (3)

Country Link
EP (1) EP4217536A1 (fr)
DE (1) DE102021123802A1 (fr)
WO (1) WO2022063643A1 (fr)

Family Cites Families (6)

* 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
US20130001334A1 (en) * 2005-02-28 2013-01-03 Johansson Ola M Refiners and methods of refining pulp
DE102008059610A1 (de) * 2008-11-28 2010-06-02 Voith Patent Gmbh Verfahren zur Mahlung von wässrig suspendierten Zellstofffasern sowie Mahlgarnituren zu seiner Durchführung
DE102015207536A1 (de) 2015-04-24 2016-10-27 Voith Patent Gmbh Behandlungsgarnitur
DE102018133114A1 (de) 2018-12-20 2020-06-25 Voith Patent Gmbh Mahlanordnung
DE102019104105B3 (de) 2019-02-19 2020-06-18 Voith Patent Gmbh Mahlgarnitursegment

Also Published As

Publication number Publication date
WO2022063643A1 (fr) 2022-03-31
DE102021123802A1 (de) 2022-03-24

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