EP2065090A1 - Moulin à courant de Foucault - Google Patents

Moulin à courant de Foucault Download PDF

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Publication number
EP2065090A1
EP2065090A1 EP08019573A EP08019573A EP2065090A1 EP 2065090 A1 EP2065090 A1 EP 2065090A1 EP 08019573 A EP08019573 A EP 08019573A EP 08019573 A EP08019573 A EP 08019573A EP 2065090 A1 EP2065090 A1 EP 2065090A1
Authority
EP
European Patent Office
Prior art keywords
grinding
rotor
inclination angle
eddy current
ribs
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Withdrawn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
EP08019573A
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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 EP2065090A1 publication Critical patent/EP2065090A1/fr
Withdrawn legal-status Critical Current

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    • 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
    • B02C13/28—Shape or construction of beater elements
    • 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
    • B02C13/16—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices with beaters hinged 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

Definitions

  • the invention relates to an eddy current mill having a grinding gap defined between a stator and a rotor according to the preamble of claim 1.
  • classifier mills For fine grinding today different types of mills are available. For example, there are classifier mills in which the material to be ground is moved upward by an air flow, thereby being separated by gravitational force, whereby heavy particles fall back into the grinding area and light particles are sifted against a rapidly rotating separator wheel. Such a classifier mill is the German utility model DE 93 13 930 U1 refer to.
  • Eddy current mills of the generic type are also known.
  • the stator has a grinding path which delimits the grinding gap outwardly with its conical or frustoconical or cylindrical inner surface, which projects with ribs projecting towards the grinding gap and extending over the length of the refining gap , or provided with a corrugation for crushing and throwing back of impacting particles.
  • the rotor has comminution sections which, during operation of the rotor, strip off a conical or cylindrical lateral surface and each have a crushing surface for impacting particles extending inwardly over at least a portion of the length of the refining gap from the lateral surface.
  • the grinding track is often designed as a grinding path insert which can be installed in a stator housing provided for this purpose, the comminution sections of the rotor being designed as grinding tool inserts attachable to a tool carrier or grinding ring of the rotor provided for this purpose.
  • 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 gap between the rotor and a lid of the housing to the outside and from there into the grinding gap, so will this Ground material between the corrugation of the grinding path and the grinding tools grind in which the individual particles depending on the material density and grain size are more or less often thrown back and forth between the grinding path 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 ground material to be comminuted and the desired material parameters of the ground Mahlgutaustrags different mills with different diameters, Mahlspaltin and - wide must be 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 fixed in a housing of the eddy current mill.
  • 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 the German patent application DE 199 62 049 refer to.
  • the eddy current mill according to the invention has a grinding track whose ribs are inclined to an imaginary radial plane extending through a Aufyak on the respective rib by a rib inclination angle to the direction of rotation, and a rotor whose crushing sections have refractive surfaces, each to one through a Aufddling Run on the respective refractive surface, imaginary radial plane inclined by a refractive surface inclination angle to the direction of rotation, wherein the refractive surface inclination angle corresponds approximately to the rib inclination angle.
  • a radial plane while a radially extending to the axis of rotation of the rotor plane is called.
  • the grinding path with the inclined ribs can also be formed on a grinding track insert, which is received in a housing of the stator as in known eddy current mills.
  • the inclined crushing surfaces may each be provided on separate crushing or grinding tool inserts, which are known per se attachable to a tool carrier ring of the rotor.
  • this not only makes it possible to influence the grinding speed of an eddy-current mill in a simple manner, ie, different grinding speeds can be achieved, for example, with one and the same eddy-current mill, merely by the grinding-rail insert and / or the tool inserts or tool carrier rings be exchanged with the tool inserts.
  • the fact that the refractive surface inclination angle is equal to the rib inclination angle can be achieved be that with each impact of a between the crushing sections and the grinding track back and forth hurled particles the impact with the maximum possible impulse towards the opposite rib of the grinding path or refractive surface of the crushing takes out, so that a total of a particularly fine and efficient grinding can be achieved to a large extent on the abandoned regrind and the desired material parameters of the final product adjustable inclination of the refractive surfaces and the ribs.
  • Mahlbahn inserts are provided with ribs of different rib inclination angle and the corresponding tool carrier rings with tool inserts have a matching to the respective grinding path Brech perennialne Trentswinkel ,
  • the angles of inclination may be different in their amount but also in their direction, i. they can be inclined in or against the direction of rotation.
  • the stay of the ground material in the grinding gap is shortened, because the rebound angle of particles occurring on the ribs or crushing surfaces runs steeper in the direction of the grinding gap outlet.
  • the ribs and / or the crushing surfaces are inclined in the direction of rotation, the residence of the ground material in the grinding gap is lengthened because the rebound angle of particles occurring on the ribs or crushing surfaces runs flatter toward the grinding gap outlet.
  • Such a grain distribution curve is desired in many applications, for example, when a color raw material is to be ground to color particle flour and a slurry of the flour is to be feared by a too high fines. Even with toners for copiers, a limitation of the grain size down is required, e.g. to 5 ⁇ m grain diameter.
  • the grinding tool can be pivoted or oscillatingly mounted on the rotor or fastened to it.
  • the pivot axis is advantageously parallel to the axis of rotation of the rotor, but may also be inclined by a few degrees, for example, the degree of inclination of the refractive surface to the radial plane. Due to the high rotational speed of the rotor while the grinding tool is held in its working position, as long as only the ground material to be ground in the grinding gap is located. If, on the other hand, a hard foreign body strikes the milling tool, it can pivot out of its working position and thereby avoid the foreign body.
  • the grinding tool can either be mounted loose pendulum on the rotor according to the hardness or other properties of the material to be ground or be designed fastened or, if the centrifugal force caused by the rotational speed of the rotor for crushing the material to be ground not sufficient, or if the grinding tool would otherwise pivot out of its working position, be biased in this working position on the rotor to be mounted or be fastened.
  • FIG. 1 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 track 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 rotor RT ' rotates about an axis of rotation R, which is at least substantially plumbed to the vertical, so that no gravity-related imbalance occurs.
  • 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 material to be ground moves outwards and reaches the grinding gap, which it collides with on the surfaces of the rotor RT 'and the milling gap MS of the stator ST 'passes down.
  • the grinding track 20 'in this case has a corrugation with ribs extending in the grinding gap longitudinal direction L in known eddy current mills, whereas the rotor RT' has one or more grinding rings fitted with grinding tools in known eddy current mills along the grinding gap MS, wherein the grinding tools extend with the rotational axis R in the radial direction Crushing surfaces are equipped.
  • FIG. 2 now shows a Mahlbahn-insert 20 according to a first embodiment of the invention, which is to replace the in FIG. 1 marked, conventional Mahlbahn insert 20 'is suitable.
  • the grinding track insert 20 in FIG. 2 Although this also has a corrugation. However, their ribs 26 extend at a rib inclination angle ⁇ to one the axis of rotation R of the rotor and an intersection point T1 with the respective rib 26 imaginary radial plane E1 (see also FIG. 3 showing the grinding path insert 20 in a state built into the stator housing 22).
  • FIG. 3 are the dashed lines of the top circle diameter and the root diameter of the ribs 26 at the upper end of the Mahlbahneininsatz 20 formed Mahlbahn 20 located, only on the left half of the individual ribs 26 have been drawn.
  • With 1 is a grinding tool insert for a according to the invention equipped with a suitable Mahlbahnrance eddy current mill and a total of 28 a Mahlring, 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 several rows of grinding tools 1 along the grinding gap and accordingly a plurality of grinding rings 28 arranged one above the other on the hub.
  • 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 designated by 21 lateral surface, which encloses the grinding gap MS from the inside, when the rotor ST is installed in the eddy current mill shown there.
  • the refractive surface 3 is inclined at a refractive surface inclination angle ⁇ of 11.25 ° with respect to a radial plane E2, which runs through the axis of rotation R.
  • the plane E2 for the figure has been chosen so that the point P2 is no longer located on the refractive surface 3, but rather on an imaginary plane extending the refractive surface. However, this does not matter for the determination of the angle ⁇ .
  • 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 the 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 the sleeve-shaped mounting portion 9 may be made 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.
  • a grinding tool insert to be used for a particular grinding stock could also consist overall of a material corresponding to this material to be grounded, for example when it comes to minimal abrasion and a high degree of freedom of the ground powder (eg in the case of luminescent powder) of ceramic, for example Al 2 O 3 , when it comes to a particularly abrasion-resistant and abrasion-resistant surface of the grinding tool for very abrasive grinding materials (for example, dolomite with quartz extraneous inclusions) of hard metal, on the other hand it depends on a non-toxic abrasion, for example in the food industry, made of stainless steel.
  • the ground powder eg in the case of luminescent powder
  • ceramic for example Al 2 O 3
  • very abrasive grinding materials for example, dolomite with quartz extraneous inclusions
  • the breaking portion 10 is soldered to the mounting portion 9.
  • any other type of connection e.g. a bonding or screwing the two sections 9, 10 of the grinding tool insert 1 conceivable with each other.
  • a coating on the crushing section for example a hard material coating (for example tungsten carbide, TiC-TaC or even diamond) and otherwise to manufacture the grinding tool insert in one piece from a cheaper material.
  • a hard material coating for example tungsten carbide, TiC-TaC or even diamond
  • G -10 a grain distribution curve of an eddy current mill is shown, the Mahlbahn in Mahlbahnlhursutter by 10 ° against the direction of rotation inclined ribs, with G o cumulative grain distribution curve of the same eddy current mill with a grinding path with conventional ribs, and with G 10, the cumulative grain distribution curve of the eddy current mill with a grinding track whose ribs are inclined by 10 ° to the direction of rotation.
  • G -10 has the flattest course, ie the smallest fines content in the material to be ground, whereas G 10 has the steepest gradient, ie the largest fines content in the material to be ground.
  • the limit diameter D40 10 , D40 o , D40 -10 and D60 10 , D60 0 , D60 -10 , where 40% and 60% of the grinding stock volume are reached vary due to the different steepness of the grain distribution curves G 10 , G o , G -10 strong.
  • the ribs or the crushing surfaces 3 run in the eddy current mills according to the invention are inclined in each case to an imaginary radial plane E 2 extending through an attachment point P 2 on the respective rib or refractive surface by a rib or crushing surface inclination angle ⁇ which simultaneously corresponds to the rib inclination angle ⁇ .
  • the refractive surfaces 3 could not be employed only in the direction along the refining gap to the radial plane E2.
  • a hiring in the manner of an indexable insert in the direction of a radial plane about an axis parallel to the axis of rotation of the rotor extending axis would be conceivable.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
EP08019573A 2007-11-29 2008-11-08 Moulin à courant de Foucault Withdrawn EP2065090A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200710057565 DE102007057565A1 (de) 2007-11-29 2007-11-29 Wirbelstrommühle, Rotor und Stator, sowie Mahlbahn-Einsatz und Mahlwerkzeug-Einsatz dafür

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Publication Number Publication Date
EP2065090A1 true EP2065090A1 (fr) 2009-06-03

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EP08019573A Withdrawn EP2065090A1 (fr) 2007-11-29 2008-11-08 Moulin à courant de Foucault

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DE (1) DE102007057565A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010009894A1 (de) 2010-03-02 2011-09-08 Rolf Schatz Rotor-Mahlwerkzeug für Rotorprallmühlen

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE438027C (de) * 1926-12-03 Schleifenbaum & Cie G M B H Ge Kohlenstaubmuehle
DE2353907A1 (de) 1973-10-27 1975-05-07 Krauss Maffei Ag Mahlwerkzeug
JPS52112858A (en) * 1976-03-19 1977-09-21 Kubota Ltd Impact type crusher
DE9313930U1 (de) 1993-09-15 1993-11-25 Kohlhaas & Kraus Ingenieurgesellschaft mbH, 53757 Sankt Augustin Einrichtungen zur Beeinflussung eines Kornspektrums in hochtourigen Sichtermühlen
EP0787528A1 (fr) * 1996-02-01 1997-08-06 Josef Fischer Broyeur à vortex
DE19962049A1 (de) 1999-12-22 2001-07-26 Babcock Bsh Gmbh Wirbelstrommühle
EP1413357A1 (fr) 2002-10-25 2004-04-28 CEMAG Anlagenbau GmbH Outil de moulage pour broyeur à vortex

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE438027C (de) * 1926-12-03 Schleifenbaum & Cie G M B H Ge Kohlenstaubmuehle
DE2353907A1 (de) 1973-10-27 1975-05-07 Krauss Maffei Ag Mahlwerkzeug
JPS52112858A (en) * 1976-03-19 1977-09-21 Kubota Ltd Impact type crusher
DE9313930U1 (de) 1993-09-15 1993-11-25 Kohlhaas & Kraus Ingenieurgesellschaft mbH, 53757 Sankt Augustin Einrichtungen zur Beeinflussung eines Kornspektrums in hochtourigen Sichtermühlen
EP0787528A1 (fr) * 1996-02-01 1997-08-06 Josef Fischer Broyeur à vortex
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
EP1413357A1 (fr) 2002-10-25 2004-04-28 CEMAG Anlagenbau GmbH Outil de moulage pour broyeur à vortex

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Publication number Publication date
DE102007057565A1 (de) 2009-06-04

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