EP2052778A1 - Moulin à courant de Foucault, ainsi qu'outil de broyage et anneau de broyage correspondants - Google Patents

Moulin à courant de Foucault, ainsi qu'outil de broyage et anneau de broyage correspondants Download PDF

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Publication number
EP2052778A1
EP2052778A1 EP08018640A EP08018640A EP2052778A1 EP 2052778 A1 EP2052778 A1 EP 2052778A1 EP 08018640 A EP08018640 A EP 08018640A EP 08018640 A EP08018640 A EP 08018640A EP 2052778 A1 EP2052778 A1 EP 2052778A1
Authority
EP
European Patent Office
Prior art keywords
grinding tool
grinding
rotor
crushing
tool
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.)
Granted
Application number
EP08018640A
Other languages
German (de)
English (en)
Other versions
EP2052778B1 (fr
Inventor
Josef Dipl.Ing. 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
Priority claimed from DE200710051393 external-priority patent/DE102007051393B4/de
Priority claimed from DE200710057565 external-priority patent/DE102007057565A1/de
Application filed by Microtec GmbH filed Critical Microtec GmbH
Publication of EP2052778A1 publication Critical patent/EP2052778A1/fr
Application granted granted Critical
Publication of EP2052778B1 publication Critical patent/EP2052778B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • B02C13/16—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
    • B02C13/28—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
    • 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 having a grinding gap defined between a stator and a rotor, and a grinding tool which can be fastened to the rotor and a grinding ring for receiving such a milling tool as are used for pulverizing.
  • the stator usually has a frustoconical grinding track with an inwardly directed, extending in the axial direction corrugation, which is usually mounted in a housing of the eddy current mill.
  • a rotor which can be driven at high speed is provided, which is equipped along the axial direction with one or more several so-called grinding rings, which are carrier elements for the grinding tools.
  • the grinding rings are in turn equipped along the circumferential direction with a plurality of grinding tools.
  • Such eddy current mills have, for example, rotational speeds of 12,000 rpm and peripheral speeds on the milling tool of 125 m / s.
  • rotational speeds of 12,000 rpm and peripheral speeds on the milling tool of 125 m / s.
  • Mahlessers caused "eaters” it comes to great damage and a high risk to operating personnel.
  • Object of the present invention is to provide an eddy current mill, and a grinding tool and a Mahlring for it, with which the downtime of the eddy current mill lowered and the risk of breakage on the grinding tool can be reduced, so that overall lower operating costs.
  • the grinding tool can be pivoted or oscillatingly mounted on the rotor or can be fastened.
  • 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 cone slope of the grinding track to the axis of rotation. 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. On the other hand, it has surprisingly been found that, in spite of the high speeds and circumferential speeds customary in eddy current mills, destructions can be avoided by pivoting the grinding tool out of its working position and thereby avoiding hard foreign bodies.
  • the crushing surface of the grinding tool is inclined from a radial plane of the rotor by an inclination angle to the direction of rotation of the rotor. This achieves a further reduction of the impact impulse of hard or heavy foreign bodies on the grinding tool, because a portion of the impact energy is converted into a slipping movement along the inclination angle and thus in friction.
  • the grinding tool can be attached either loose pendulum on the rotor according to the hardness or other properties of the ground material be performed fastened or, if the caused by the rotational speed of the rotor centrifugal force for crushing the ground material is insufficient or if the grinding tool would otherwise pivot out of its working position, be biased in this working position on the rotor fastened or be fastened.
  • a grinding tool to be used for a particular grinding stock can in each case consist in total of a material corresponding to this material to be grounded, for example when it comes to a minimum of abrasion and a high degree of freedom of metal of the ground powder (eg in the case of luminescent powder) made of ceramic, for example Al 2 O 3
  • a particularly abrasion-resistant and abrasion-resistant surface of the grinding tool for very abrasive grinding materials for example, dolomite with quartz foreign inclusions
  • cemented carbide for example in the food industry, made of stainless steel.
  • the attachment portion may be made of material rather simple or cheaper than the example, particularly hard crushing section.
  • the breaking section can be soldered, for example, with the attachment portion.
  • an alternating plate to the crushing section, as described for example in the European patent application EP 1 413 357 A1 has already been proposed, and to manufacture this crushing plate from a specific material associated with the crushing process and the support plate holding the crushing plate integral with the attachment portion of a different material.
  • the crushing surface of the grinding tool pointing in the direction of rotation of the rotor formed by a coating on the crushing portion, for example, a hard material coating (for example, tungsten carbide, Tictac or even diamond) and the grinding tool otherwise in one piece from a cheaper material to manufacture.
  • the crushing section as a crushing plate with the simplest possible geometry, ie, for example, in the form of a parallelepiped and with the smallest possible extent only in the grinding area in order to save material.
  • the pivot axis is spaced from the grinding area, then due to the larger lever, the impulse necessary for triggering the pivoting decreases, so that ultimately the thickness of the crushing plate can also be reduced.
  • the crushing plate can be spaced apart from a sleeve section by means of a blade which is longer in comparison to its radial extension, on which the grinding tool can be connected to the rotor of the eddy-current mill.
  • This has the further advantage that the crushing plate can also contribute with its radially inner edge for comminution when it is in the grinding area.
  • the crushing plate can be mounted particularly easily when the wing section has two parallel double wings which delimit a clamping gap into which the crushing plate can be inserted.
  • a screwing of the crushing plate may be provided on the wing legs. If the crushing plate is worn, it can easily be turned over if it is ground on all edges.
  • the grinding tool has a wing-shaped breaking section 10, which is soldered to a sleeve-shaped fastening section 9 and can consist of a hard metal, whereas the sleeve-shaped fastening section 9 can be made of a standard structural steel.
  • soldering any other type of connection, e.g. a bonding or screwing the two sections of the grinding tool 1 with each other conceivable.
  • the sleeve-shaped fastening portion 9 or sleeve portion 9 is inserted between two support plates 5, 6 of a break ring shown broken, each having aligned through holes 11.
  • a bolt 8 is performed, which fastened via a nut 12, the grinding tool 1 on Mahlring.
  • the wing section 10 has a refractive surface designated by 3 on the side pointing in the direction of rotation, against which the particles rebounding from the grinding track located on the other side of the refining gap are to strike and thereby be crushed, so that the millbase 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.
  • FIG. 3 a further improved embodiment of the invention is shown with respect to avoiding damage when entering into the eddy current mill, hard foreign matter.
  • the grinding tool is designated by 101 and has a from a radial plane E to the direction of rotation R of the rotor inclined towards refractive surface 3. This further reduces the impulse impinging impulse, since part of the impulse is converted into frictional energy as it slides off the inclined plane.
  • an angle of inclination ⁇ an angle of 8 ° to 15 ° has proven to be particularly advantageous in experiments proved.
  • the structure of the crushing section 110, but also of the fixing portion 109 corresponds to the structure of the in the Figures 1 and 2 Milling tool 1 shown.
  • the grinding tool in this case has a sleeve portion 209, with which it can be attached to the rotor oscillating or between two support rings of the rotor.
  • a wing section 213 adjoins the sleeve section 209, via which the breaking tool or the crushing plate 210, which is designated as a whole by 210, is suspended at a distance from the pivot axis defined by the sleeve section.
  • the sleeve portion 209 and the wing portion 213 together form the attachment portion of the grinding tool 209 and may be integrally formed, for example, as a casting.
  • the wing portion 213 is designed as a double wing with two parallel wing legs 213, between which the breaking tool 210 can be clamped.
  • When replacing the crushing tool 210 is thus a certain prefixing or guiding available to bring the breaking tool 210 to the same for screwing the intended position on the wing portion 213 position and to hold there until with 15 designated screws in corresponding through holes 16 on the Wing legs 213 and also inserted in the breaking tool 210 and has been countered on the opposite side.
  • the crushing tool 210 is formed as a hard metal crushing plate and has the shape of a parallelepiped with a pointing in the direction of rotation of the rotor of the Wirbelstommühle refractive surface 203, which has a sharp, outwardly directed crushing edge 204a, in the Konusne Trentswinkel the grinding path of the eddy current mill to the rotation axis is inclined.
  • edges 204b, 204c, 204d surrounding the crushing surface at the top, at the bottom and toward the axis of rotation are also sharp in order to grind also ground material, which flow has come from the grinding gap between the grinding track and the outer region of the grinding tools 210 inwardly into the region of the inner breaking edge 204 by the rotation of the rotor of the eddy current mill at high speeds of rotation or on the way there at the upper or lower Along breaking edge.
  • the crushing plate 203 has a smaller radial extent with respect to the vane section 213, so that the crushing surface 203 and in particular the inner crushing edge 204d is in a region in which the entire crushing surface 203 and the inner crushing edge 204d are also used for superfine grinding in eddy-current mills high speeds can still contribute to the grinding process.
  • the long double wing 213 that upon impact of a hard, high-mass foreign body on the crushing plate 210, a moment necessary for pivoting the grinding tool 201 is generated.
  • the grinding tool 201 can also be provided with sharp edges on the side facing the direction of rotation, so that it can easily be turned when the crushing surface 203 is worn.
  • the grinding tool could also be constructed so that the crushing surface is inclined to the direction of rotation, thereby also reducing the shock pulse of hitting hard, high-mass foreign bodies and thus reduce the possibility that the Mahltechnik train is destroyed, continue to lower.
  • the grinding tool could be suspended on the whole by a pivot axis inclined over a radial plane, wherein only the contact surfaces on the sleeve section 209 would have to be formed at a corresponding offset to the vertical angle to the pivot axis.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
EP08018640.6A 2007-10-25 2008-10-24 Moulin à courant de Foucault, ainsi qu'outil de broyage et anneau de broyage correspondants Active EP2052778B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200710051393 DE102007051393B4 (de) 2007-10-25 2007-10-25 Wirbelstrommühle, sowie Mahlwerkzeug und Mahlring dafür
DE200710057565 DE102007057565A1 (de) 2007-11-29 2007-11-29 Wirbelstrommühle, Rotor und Stator, sowie Mahlbahn-Einsatz und Mahlwerkzeug-Einsatz dafür

Publications (2)

Publication Number Publication Date
EP2052778A1 true EP2052778A1 (fr) 2009-04-29
EP2052778B1 EP2052778B1 (fr) 2015-07-01

Family

ID=40120072

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08018640.6A Active EP2052778B1 (fr) 2007-10-25 2008-10-24 Moulin à courant de Foucault, ainsi qu'outil de broyage et anneau de broyage correspondants

Country Status (1)

Country Link
EP (1) EP2052778B1 (fr)

Cited By (2)

* 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
TWI549755B (zh) * 2015-06-18 2016-09-21 Huan-Gui Wei Grinder of the mixing device

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1436101A (en) * 1919-02-25 1922-11-21 Joseph L Hiller Crushing and pulverizing machine
DE438027C (de) * 1926-12-03 Schleifenbaum & Cie G M B H Ge Kohlenstaubmuehle
JPS52112858A (en) * 1976-03-19 1977-09-21 Kubota Ltd Impact type crusher
GB2058608A (en) * 1979-09-17 1981-04-15 Jadouin Michel Albert Pulverisers
JPS56158153A (en) * 1980-05-08 1981-12-05 Kyokuto Kaihatsu Kogyo Co Hammer in crusher
US4369548A (en) * 1980-07-23 1983-01-25 Malinak Frank J Depither
DE3436803A1 (de) 1984-10-06 1986-04-17 Werner Ing.(grad.) 6719 Carlsberg Schatz Schlagwerkzeuge und pralleisten insbesondere fuer steinmuehlen
EP0787528B1 (fr) 1996-02-01 1999-07-14 Josef Fischer Broyeur à vortex
DE20216551U1 (de) 2002-10-25 2003-01-02 CEMAG Anlagenbau GmbH, 31789 Hameln Mahlwerkzeug für eine Wirbelstrommühle
DE102005055620A1 (de) 2005-11-22 2007-05-24 Schäfer, Ralf Vorrichtung zum Verarbeiten von Bauteilen aus Stoffgemischen

Patent Citations (11)

* 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
US1436101A (en) * 1919-02-25 1922-11-21 Joseph L Hiller Crushing and pulverizing machine
JPS52112858A (en) * 1976-03-19 1977-09-21 Kubota Ltd Impact type crusher
GB2058608A (en) * 1979-09-17 1981-04-15 Jadouin Michel Albert Pulverisers
JPS56158153A (en) * 1980-05-08 1981-12-05 Kyokuto Kaihatsu Kogyo Co Hammer in crusher
US4369548A (en) * 1980-07-23 1983-01-25 Malinak Frank J Depither
DE3436803A1 (de) 1984-10-06 1986-04-17 Werner Ing.(grad.) 6719 Carlsberg Schatz Schlagwerkzeuge und pralleisten insbesondere fuer steinmuehlen
EP0787528B1 (fr) 1996-02-01 1999-07-14 Josef Fischer Broyeur à vortex
DE20216551U1 (de) 2002-10-25 2003-01-02 CEMAG Anlagenbau GmbH, 31789 Hameln Mahlwerkzeug für eine Wirbelstrommühle
EP1413357A1 (fr) 2002-10-25 2004-04-28 CEMAG Anlagenbau GmbH Outil de moulage pour broyeur à vortex
DE102005055620A1 (de) 2005-11-22 2007-05-24 Schäfer, Ralf Vorrichtung zum Verarbeiten von Bauteilen aus Stoffgemischen

Cited By (4)

* 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
TWI549755B (zh) * 2015-06-18 2016-09-21 Huan-Gui Wei Grinder of the mixing device

Also Published As

Publication number Publication date
EP2052778B1 (fr) 2015-07-01

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