EP2070596A1 - Moulin à courant de Foucault - Google Patents

Moulin à courant de Foucault Download PDF

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Publication number
EP2070596A1
EP2070596A1 EP08019651A EP08019651A EP2070596A1 EP 2070596 A1 EP2070596 A1 EP 2070596A1 EP 08019651 A EP08019651 A EP 08019651A EP 08019651 A EP08019651 A EP 08019651A EP 2070596 A1 EP2070596 A1 EP 2070596A1
Authority
EP
European Patent Office
Prior art keywords
rotor
coarse
counter
sections
grinding
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.)
Withdrawn
Application number
EP08019651A
Other languages
German (de)
English (en)
Inventor
Josef Fischer
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.)
Lehigh Technologies Inc
Original Assignee
Microtec 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 Microtec GmbH filed Critical Microtec GmbH
Publication of EP2070596A1 publication Critical patent/EP2070596A1/fr
Withdrawn legal-status Critical Current

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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
    • B02C13/00—Disintegrating by mills having rotary beater elements ; Hammer mills
    • B02C13/14—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices
    • B02C13/18—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices with beaters rigidly connected to the rotor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C13/00—Disintegrating by mills having rotary beater elements ; Hammer mills
    • B02C13/26—Details
    • B02C13/282—Shape or inner surface of mill-housings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C13/00—Disintegrating by mills having rotary beater elements ; Hammer mills
    • B02C13/14—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices
    • B02C2013/145—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices with fast rotating vanes generating vortexes effecting material on material impact

Definitions

  • the invention relates to an eddy current mill with a grinding gap defined between a stator and a rotor, according to the preamble of claim 1
  • the stator has a grinding path which delimits the grinding gap to the outside with its conical or frustoconical or cylindrical inner surface, which with projecting towards the grinding gap, over the length of the refining gap extending ribs, or with a corrugation for crushing and throwing back impacting particles.
  • the rotor has milling tools which, during operation of the rotor, strip off a conical or cylindrical lateral surface and each have a crushing surface for impacting particles which extends inwardly over at least a portion of the length of the refining gap from the lateral surface.
  • the grinding path is often designed as a Mahlbahn insert which can be installed in a stator housing provided for this purpose, the stator housing often having a lid with a grinding material feed opening which is screwed onto the grinding path holder receiving the grinding path insert.
  • the grinding tools of the rotor are usually mounted on a dedicated istisme- or Mahlring the rotor.
  • the rotor now rotates at high speed in the stator, wherein the axis of rotation runs approximately in the vertical direction, and millbase is abandoned from above and centrifuged in a conveying gap between the rotor and a cover of the stator housing to the outside and from there into the grinding gap, so This grinding stock is ground between the corrugation of the grinding path and the grinding tools by the individual particles depending on the material density and grain size are more or less often thrown back and forth between grinding track and grinding tools and thereby broken or smashed.
  • Such eddy current mills have, for example, working speeds of 12,000 rpm and working peripheral speeds on the grinding tool of 125 m / s, depending on the field of application, the material properties of the crumble Grinders and the desired material parameters of the ground Mahlgutaustrags different mills with different diameters, Mahlspaltin and widths are used.
  • Eddy current mills of this type are for example from their own patent EP 0787 528 B1 known.
  • the stator has a frustoconical grinding path insert with an inwardly directed, axially extending corrugation, which is secured in a skirt with a lid attached thereto on the top.
  • a high-speed drivable rotor is provided which is equipped along the axial direction with several so-called Mahlringen, which are support elements for the grinding tools.
  • Mahlringen which are support elements for the grinding tools.
  • the grinding rings are in turn equipped along the circumferential direction with a plurality of grinding tools.
  • Another generic eddy current mill is known from the German patent application DE 199 62 049 A1 known.
  • the local eddy current mill has in addition to the actual grinder upstream coarse shredding tool, which are attached to the top wall of the rotor and to comminute coming from a central Mahlgutiergabe regrind in the radial flow channel between the lid of the stator and the top wall of the rotor.
  • the object of the present invention is to refine a generic eddy current mill so that fibrous or coarse feed material can be better processed.
  • the coarse comminution unit of the eddy current mill upstream of the actual grinder has, in addition to a number of coarse comminution sections on the top wall of the rotor, a further number of counter coarse comminution sections facing the coarse comminution sections on the other side of the coarse comminution gap, whereby the coarse comminution sections and the counter coarse comminution sections are movable relative to one another are.
  • the coarse comminution gap is simply a gap region adjoining the annular grinding gap, ie an extension of the refining gap on the side of the rotor facing the coarse material feed opening.
  • the coarse shredding gap may have a greater width than the grinding gap.
  • the fineness required for grinding on the eddy-current mill can be reduced by brittle materials such as feedstocks consisting of limestone with the eddy-current mill according to the invention.
  • feed materials consisting of fibrous materials such as paper
  • better results are achieved.
  • in the recent popular become crushing of chewed to lumps catalogs or the like to thermal insulation wool very good results are achieved, d. h., That there are few failures due to "munchies" in the grinder.
  • the coarse crushing sections and the Gegengrobzerklein mecanicsabitese are designed as pins or blocks, which are arranged in the manner of a pin mill as sprockets, which are spaced in the radial direction of the rotor and preferably overlap in the axial direction of the rotor, in particular when a plurality of coarse shredding gear rings and a plurality of counter-crushing sprockets is provided.
  • the entering into the coarse crushing feed particles meet on their flow path to the grinder on the arranged in the toothed rings pin or block-shaped baffles and thus need to overcome a plurality of toothed rings to get to the grinding gap.
  • the particles must therefore take a zig-zag course or be immediately crushed when they enter audf direct way in the range of rotation of the respective toothed ring.
  • the spacing of the toothed rings With the spacing of the toothed rings, the fineness of coarse grinding can be influenced.
  • the teeth, or pins or blocks are exchangeably mounted on the stator cover or on the top wall of the rotor, so for example screwed.
  • the attachment of serving as coarse crushing sections or Gegengrobzerklein mecanicsabbalde teeth, or pins or blocks can be vorortlichverschiebbar, for example by screwing in guided in corresponding grooves nuts.
  • the coarse shredding gap of the coarse shredding unit used between the cover of the stator housing with the Grobgutholzgabeö Maschinen and the top cover wall of the rotor as well as existing conveying gap, in which the fed to the Grobgutaufgabeö Samuel Grobgutteilchen be centrifuged in the horizontal direction radially outward to the grinding gap.
  • Leitrippen can be used for centrifuging the discontinued coarse particles in the grinding gap on the rotor top conventional vortex flow mills often existing, extending in the radial direction or at least with radial component Leitrippen that can be used unchanged or with minor modifications as coarse crushing sections of the coarse comminution.
  • Leitrippen associated On the cover of the stator housing then the Leitrippen associated, be provided on the other side of the conveying or coarse crushing Gegengrobzerklein ceremoniessabête.
  • the coarse comminution gap can have a constant width over its entire length or a width tapering towards the grinding gap, so that particularly coarse particles are already ground in the entrance area of the coarse comminution unit, whereas less coarse particles are only ground in a region lying further inside.
  • the conveying gap between the stator housing cover section and the rotor upper side which is used as a coarse comminution gap
  • the conveying gap can have a horridontal course.
  • a curved course, in particular without edge at the transition into the grinding gap would be conceivable.
  • these may be formed as mutually movable projections on both sides of the coarse crushing gap or at least on one side as a movable knife (or counter knife), whereby such a projection may have a sharp edge, ie a knife edge (or - counter blade). Also knife and counter knife on both sides of the coarse crushing gap would be conceivable.
  • these crushing surfaces may additionally open into a sharp edge on the side delimiting them towards the conveying gap, wherein the free surface lying opposite the rough crushing surface on the other side of the edge may preferably include an acute angle with the rough crushing surface.
  • the coarse crushing surface can be set against the plane of the top wall.
  • the roughing surface and / or the sharp edge may be provided on an indexable cutting plate attached to the guide rib.
  • additional coarse comminuting sections for example in the form of individual coarse breaking teeth projecting from the rotor cover wall, may additionally be provided.
  • the coarse comminuting sections on the rotor cover wall on the other side of the conveying gap are located opposite countercutting comminuting sections which can be embodied in all the developments described above.
  • the guide ribs are provided there in their radial position corresponding counter ribs, which in turn have the coarse crushing surfaces on the guide ribs facing Gegengrobbrech lake or counter cutting.
  • additional single counter-teeth may be provided. It would also be conceivable that the guide ribs or the counter ribs have a serrated profile.
  • FIG. 4 shows a schematic representation of the grinding area of a generic eddy current mill.
  • the eddy current mill in this case has a stator ST ', which has a stator housing 22', in which a conical or truncated cone-shaped grinding path insert 20 is accommodated and fastened via an annular flange part 24.
  • the annular flange portion 24 is connected to the stator housing 22 'and the grinding path insert 20, as in FIG. 1 indicated, screwed, which can be adjusted by means of washers, the height of the grinding path 20 ', whereby influence on the width of a designated MS refining gap between the stator ST' and rotor RT 'can be taken.
  • the grinding gap MS is thereby limited by the stator ST 'via an inner surface 21 of the grinding path insert 20' and on the other hand by the rotor RT 'via an outer circumferential surface 23 of the rotor RT'.
  • the millbase Starting from a central Mahlgutaufgabeö réelle 19 in a cover region of the stator housing 22 via the centrifugal forces generated by the rotating rotor, the millbase then moves to the outside and reaches the grinding gap MS, which upon impact with the surfaces of the rotor RT 'and the milling gap MS faces of the stator ST 'passes down.
  • the grinding track 20 'in this case has a corrugation in the Mahlspaltlnaturescardi L running ribs, where against the rotor RT' in known eddy current mill along the grinding gap MS one or more equipped with grinding tools grinding rings, the grinding tools with in the radial direction to the axis of rotation R extending crushing surfaces are equipped.
  • FIG. 1 now shows an eddy current mill according to an embodiment of the invention, which in its basic structure and dimensions, although the in FIG. 1 has shown eddy current mill, but in its input region between the Grobgutiergabeö réelle 19 and the grinding gap MS has a coarse shredding plant.
  • the structure of the rotor RT will be explained in more detail.
  • a grinding tool insert 1 with a grinding tool insert is designated and a total of 28 a grinding ring, which has two support plates 5, 6, between which distributed over the circumference of the grinding ring 28 a plurality of grinding tool inserts 1 are attached.
  • the grinding ring 28 is attached to a rotor hub 29 and is with the rotor hub 29 part of the total designated RT rotor.
  • the rotor can have only one grinding ring 28 or else along the Mahlspalts several rows of grinding tools 1 and accordingly several superimposed on the hub grinding rings 28th
  • the grinding tool insert 1 on the side facing in the direction of rotation R of the rotor has a refractive surface designated 3, on which impinge from the lying on the other side of the grinding gap grinding path particles and are to be smashed, so that the Ground material is ground to fine powder.
  • the crushing surface 3 is bounded on its radial outer side by a sharp edge 4, which is slightly inclined to the axis of rotation of the rotor, which in turn corresponds to the cone slope of the grinding path, so that the width of the grinding gap is constant.
  • the edges 4 of arranged on the grinding ring 28 grinding tool inserts strip the in FIG. 1 with 21 designated lateral surface from which encloses the grinding gap MS from the inside.
  • a cover plate 34 is screwed, which has designated 36, extending in the radial direction to the rotor axis R guide ribs.
  • the guide ribs 36 are constructed as coarse shredding sections along the conveying gap GS of the Grobgutaufnahe 19 to the grinding gap MS, as further below with reference to the FIG. 2 will be explained in more detail.
  • a cover 30 of the stator which also extend in the radial direction to the axis of rotation R of the rotor and are arranged at a radial height of the guide ribs 36 and one of the length the guide ribs 36 have corresponding length.
  • the cover 30 is screwed with circumferential screwing on a peripheral flange with a Mahlbahnein neutral 22.
  • the millbase discharged at the Mahlgutiergabeö réelle 19 thereby takes the arrows drawn path through the coarse crushing gap GS, in which a certain pre-crushing takes place, through to the grinding gap MS, in which then the actual grinding between the grinding path 20 and grinding tools 1 happens, so that the bottom of the grinder of the eddy current mill emerging regrind ultimately has the desired consistency and can be ensured that none of the grinder to coarse particles or lumps of the abandoned ground material in the grinding gap MS can reach.
  • FIG. 1 shown cover 30 of the stator ST is in FIG. 3 shown in a plan view of its underside, wherein in addition to the Schmidtgrobzerklein ceremoniessrippen 32 more Schmidtgrobzerklein mecanicsabête 132 and 232 are located, which may be provided according to further advantageous embodiments of the invention in addition to the Schwarzggrobzerklein ceremoniessrippen 32 or instead.
  • rotor cover wall or plate 34 is in FIG. 2 shown in a plan view on its top.
  • a further embodiment of a coarse shredding rib 136 is shown, which according to further embodiments of the invention, the coarse shredding ribs 36 can be provided replacing or supplementary to these on the cover plate 34 of the rotor RT. Also, several distributed over the circumference of the cover plate 34 of the rotor RT coarse crushing ribs would be conceivable.
  • the guide ribs 36 and 136 serve to centrifuge the grinding material loaded on the coarse material feed opening 19 into the grinding gap MS.
  • they have a Vorbrech Structure pointing in the direction of rotation R of the rotor RT, which is either directly formed on the protruding ribs 36 and is referred to in this case 39 or at a bolted to the respective rib 136 and the second plate 137 is then denoted by 139.
  • the Vorbrech lake 39 and 139 of the coarse crushing ribs 36 and 136 are alsobirbrech lake 38 and 138 assigned to the counter to the direction of rotation R of the rotor RT side of the Gegengrobzerklein mecanicsrippen 32 and 132.
  • the Schmidtbrech lake 138 are in turn provided on a screwed onto the respective Gegengrobzerklein réellesrippe 132 removable plate 133.
  • the removable plates 137 and 133 are each as indexable inserts with one in the Figures 2 and 3 formed in the sheet plane extending cutting edge 142 and 141, respectively.
  • the exchangeable plates 133, 137 can consist of a material suitable for breaking or cutting the grinding material entering the coarse crushing gap, whereas the carrier ribs 132, 136 may consist of a cheaper carrier material.
  • the exchangeable plates 133, 137 may consist of a ceramic, for example Al 2 O 3 .
  • carbide is particularly suitable as a material of the removable plates.
  • the support ribs 132, 136 can then be made of the same material as the cover 30 and the cover plate 34, so that they can each be manufactured as a one-piece casting.
  • the milling tool insert 1 has a wing-shaped crushing section 10 which is soldered to a sleeve-shaped fastening section 9.
  • the sleeve-shaped fastening portion 9 or sleeve portion 9 is inserted between the support plates 5, 6.
  • the support plates 5, 6 have through holes, which are aligned with the sleeve portion 9 of the respective milling tool insert 1.
  • a screw bolt 8 is performed, which fixes the milling tool insert 1 on the grinding ring 28 via a nut 12.
  • the grinding tool insert 1 is pivotable or oscillating attached to the rotor RT, wherein the pivot axis S advantageously extends axially parallel to the axis of rotation of the rotor.
  • this could also be inclined by a few degrees, for example by the degree of conical inclination of the grinding path to the axis of rotation or in the direction of a refractive surface inclination angle. Due to the high rotational speed of the rotor RT in eddy current mills of the generic type of the grinding tool insert 1 is held in its working position, as long as only the ground material to be ground in the grinding gap is located.
  • the grinding tool insert 1 can thus either be attached loosely oscillating on the rotor RT or fastened in accordance with the hardness or other properties of the ground material or, if caused by the rotational speed of the rotor RT centrifugal force for crushing the ground material is insufficient or if Otherwise, the grinding tool insert 1 would pivot out of its working position, be biased in this working position on the rotor RT be fastened or be fastened.
  • the wing portion 10 may consist of a hard metal, whereas can be made against the sleeve-shaped mounting portion 9 of a standard structural steel. In this way, on the one hand, the fastening section 9 can be made of material rather simply or cheaper than the breaking section 10.
  • the eddy current mill according to the invention has only one grinding and one coarse grinding plant.
  • the eddy current mill in several stages with several, according to coarseness of the ground material pre-shredders or to form grinders along the way of the feed material through the mill.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Pulverization Processes (AREA)
  • Crushing And Grinding (AREA)
EP08019651A 2007-12-13 2008-11-11 Moulin à courant de Foucault Withdrawn EP2070596A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102007060072A DE102007060072B4 (de) 2007-12-13 2007-12-13 Wirbelstrommühle

Publications (1)

Publication Number Publication Date
EP2070596A1 true EP2070596A1 (fr) 2009-06-17

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EP08019651A Withdrawn EP2070596A1 (fr) 2007-12-13 2008-11-11 Moulin à courant de Foucault

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EP (1) EP2070596A1 (fr)
DE (1) DE102007060072B4 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2319625A1 (fr) 2009-11-05 2011-05-11 MICROTEC GmbH Moulin à courant de Foucault et outil de broyage correspondant
DE202010006173U1 (de) 2010-04-27 2011-10-17 Pallmann Maschinenfabrik Gmbh & Co. Kg Vorrichtung zum Zerkleinern von Aufgabegut
WO2014166797A3 (fr) * 2013-04-10 2014-12-04 Panel Board Holding Bv Procede et dispositif de broyage

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0787528B1 (fr) 1996-02-01 1999-07-14 Josef Fischer Broyeur à vortex
DE19962049A1 (de) 1999-12-22 2001-07-26 Babcock Bsh Gmbh Wirbelstrommühle
DE20216551U1 (de) * 2002-10-25 2003-01-02 CEMAG Anlagenbau GmbH, 31789 Hameln Mahlwerkzeug für eine Wirbelstrommühle
DE10149515A1 (de) * 2001-10-08 2003-04-17 G & A Industrieanlagen Gmbh Verfahren und Vorrichtung zur Herstellung eines Kunststoffproduktes aus recycelten, mit Zellulosebestandteilen behafteten Kunststoffabfällen

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1507603A1 (de) * 1966-11-26 1969-07-24 Wilh Ley Maschf Hammermuehle
DE102005021503A1 (de) * 2005-05-10 2006-11-30 Schäfer, Ralf Vorrichtung zum Verarbeiten von Bauteilen aus Stoffgemischen

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0787528B1 (fr) 1996-02-01 1999-07-14 Josef Fischer Broyeur à vortex
DE19962049A1 (de) 1999-12-22 2001-07-26 Babcock Bsh Gmbh Wirbelstrommühle
DE10149515A1 (de) * 2001-10-08 2003-04-17 G & A Industrieanlagen Gmbh Verfahren und Vorrichtung zur Herstellung eines Kunststoffproduktes aus recycelten, mit Zellulosebestandteilen behafteten Kunststoffabfällen
DE20216551U1 (de) * 2002-10-25 2003-01-02 CEMAG Anlagenbau GmbH, 31789 Hameln Mahlwerkzeug für eine Wirbelstrommühle

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2319625A1 (fr) 2009-11-05 2011-05-11 MICROTEC GmbH Moulin à courant de Foucault et outil de broyage correspondant
DE102009053150A1 (de) 2009-11-05 2011-05-12 Microtec Gmbh Wirbelstrommuehle und Mahlwerkzeug dafür
DE202009019131U1 (de) 2009-11-05 2017-01-22 Microtec Gmbh Wirbelstrommühle und Mahlwerkzeug dafür
DE202010006173U1 (de) 2010-04-27 2011-10-17 Pallmann Maschinenfabrik Gmbh & Co. Kg Vorrichtung zum Zerkleinern von Aufgabegut
EP2383037A1 (fr) 2010-04-27 2011-11-02 Pallmann Maschinenfabrik GmbH & Co. KG Dispositif de broyage de matériaux de chargement
US9403168B2 (en) 2010-04-27 2016-08-02 Pallmann Maschinenfabrik Gmbh & Co. Kg Device for comminuting feedstock
EP2383037B1 (fr) * 2010-04-27 2019-06-05 PALLMANN MASCHINENFABRIK GmbH & Co. KG Dispositif de broyage de matériaux de chargement
WO2014166797A3 (fr) * 2013-04-10 2014-12-04 Panel Board Holding Bv Procede et dispositif de broyage

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Publication number Publication date
DE102007060072A1 (de) 2009-06-18
DE102007060072B4 (de) 2013-03-28

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