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 PDFInfo
- 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
Links
- 238000000227 grinding Methods 0.000 title claims abstract description 110
- 239000000463 material Substances 0.000 claims description 25
- 229910052751 metal Inorganic materials 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 4
- 229910000746 Structural steel Inorganic materials 0.000 claims description 2
- 239000000919 ceramic Substances 0.000 claims description 2
- 230000006378 damage Effects 0.000 description 5
- 238000005299 abrasion Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000003801 milling Methods 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 229910000514 dolomite Inorganic materials 0.000 description 1
- 239000010459 dolomite Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 description 1
Images
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)
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)
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)
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 |
-
2008
- 2008-10-24 EP EP08018640.6A patent/EP2052778B1/fr active Active
Patent Citations (11)
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)
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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