EP4000735B1 - Broyeur à boulets à agitateur - Google Patents

Broyeur à boulets à agitateur Download PDF

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Publication number
EP4000735B1
EP4000735B1 EP21208681.3A EP21208681A EP4000735B1 EP 4000735 B1 EP4000735 B1 EP 4000735B1 EP 21208681 A EP21208681 A EP 21208681A EP 4000735 B1 EP4000735 B1 EP 4000735B1
Authority
EP
European Patent Office
Prior art keywords
grinding chamber
agitator
ball mill
agitator ball
coils
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.)
Active
Application number
EP21208681.3A
Other languages
German (de)
English (en)
Other versions
EP4000735C0 (fr
EP4000735A1 (fr
Inventor
Guillaume Martin
Benedikt SIMONS
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.)
Willy A Bachofen AG
Original Assignee
Willy A Bachofen AG
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 Willy A Bachofen AG filed Critical Willy A Bachofen AG
Publication of EP4000735A1 publication Critical patent/EP4000735A1/fr
Application granted granted Critical
Publication of EP4000735B1 publication Critical patent/EP4000735B1/fr
Publication of EP4000735C0 publication Critical patent/EP4000735C0/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
    • B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
    • B02C17/18—Details
    • B02C17/1815—Cooling or heating devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
    • B02C17/16—Mills in which a fixed container houses stirring means tumbling the charge
    • B02C17/163—Stirring means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
    • B02C17/04—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls with unperforated container
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
    • B02C17/16—Mills in which a fixed container houses stirring means tumbling the charge
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
    • B02C17/18—Details
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
    • B02C17/18—Details
    • B02C17/24—Driving mechanisms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C19/00—Other disintegrating devices or methods
    • B02C19/18—Use of auxiliary physical effects, e.g. ultrasonics, irradiation, for disintegrating

Definitions

  • the present invention relates to an agitator ball mill.
  • a well-known agitator ball mill is, for example, in EP 3 102 332 B1 described.
  • the agitator ball mill described there comprises an essentially cylindrical grinding chamber, which is delimited by a jacket and an inlet and an outlet end wall, as well as a rotatably mounted agitator shaft, on which agitator elements, also known as accelerators, are axially mounted inside the grinding chamber (i.e. in the direction of the longitudinal axis the agitator shaft) are arranged at a distance from one another.
  • the agitator shaft and thus the agitator elements connected to it in a rotationally fixed manner are set in rotation by an external motor.
  • the material to be ground it is desirable or necessary for the material to be ground to be heated during the grinding process, e.g. to improve the grinding process or to activate or support chemical reactions.
  • Agitator ball mills with heating devices for the material to be ground have therefore already been proposed.
  • an agitator ball mill in which a separate heating and cooling chamber is arranged around the grinding chamber, through which a heating or cooling medium can flow.
  • the agitator shaft itself can also be heated or cooled.
  • an agitator ball mill is shown in which a heater is arranged outside on the wall of the grinding chamber.
  • This is an electrical heating band that heats the wall of the grinding chamber by contact.
  • a high-frequency induction heater can be provided, which also heats the wall of the grinding chamber.
  • JP 2009 000633 A describes an agitator ball mill which has an electric coil around the outside of the wall of the grinding chamber.
  • the coil creates a magnetic field that induction heats the wall of the grinding chamber.
  • an agitator bead mill with induction heating is shown.
  • an electrical coil is arranged as an inductor around the agitator shaft.
  • two coils are arranged at an axial distance as inductors on the stirring shaft.
  • the stirring elements arranged on the stirring shaft are designed as electrically conductive susceptors and are inductively heated by the magnetic field of the coil(s). The heat from the stirring elements is transferred to the material to be ground, so that the material to be ground is heated more or less indirectly. All components of the induction heating are arranged inside the grinding chamber of the agitator bead mill.
  • an inductively heated agitator bead mill of the generic type is to be improved by the present invention in that in connection with the WO 2019/228983 A1 described disadvantages are avoided.
  • an agitator ball mill with inductive heating is to be proposed, which is structurally less complex than the known agitator ball mill of this type.
  • the agitator ball mill comprises a grinding chamber which has a jacket, and also a rotatably mounted agitator shaft which protrudes into the grinding chamber and on which at least one agitator element is arranged inside the grinding chamber. It also includes an inlet for supplying material to be ground and grinding bodies into the grinding chamber and an outlet for removing the ground material, and an induction heater comprising an inductor and a susceptor for the material to be ground in the grinding chamber.
  • the at least one stirring element includes the susceptor.
  • the inductor comprises at least one coil which is arranged outside the casing of the grinding chamber and encloses the grinding chamber.
  • the shell of the grinding chamber consists of an electrically and magnetically non-conductive material.
  • the inductor Due to the (static) arrangement of the inductor outside the grinding chamber, it is protected from the influences of the material to be ground and, above all, the grinding body, and the energization of the inductor is structurally simple. Because the shell of the grinding chamber consists of an electrically and magnetically non-conductive material, the magnetic field generated by the inductor (namely the coil) can penetrate the shell and act on the susceptor material contained in the at least one stirring element, whereby the susceptor material and so that the stirring element is also heated. In particular, the stirring element can be produced as a whole from the susceptor material, so that the stirring element consists of the susceptor material.
  • the susceptor of the induction heating consists of an electrically and/or magnetically conductive material which is inductively heated by the alternating magnetic field of the inductor (the coil) of the induction heating.
  • the susceptor is preferably at least electrically conductive. In such an electrically conductive susceptor, eddy currents are induced by the alternating magnetic field of the inductor, which then heat the susceptor (and thus also the stirring element).
  • two or more agitators are arranged on the agitator shaft at a distance from one another along the agitator shaft.
  • the inductor comprises two or more coils, which are arranged along the shell of the grinding chamber in such a way that the magnetic field they generate only acts on one of the stirring elements.
  • the two or more coils are preferably designed to be separately controllable.
  • the agitator ball mill comprises a high-frequency generator for supplying the coil or coils with alternating current at a working frequency of the high-frequency generator, the working frequency of the high-frequency generator being in the range from 1 kHz to 1 MHz.
  • the induction heating has a natural frequency
  • the working frequency of the high-frequency generator is at or near the natural frequency of the induction heating. This optimizes the efficiency of the induction heating and its energy consumption.
  • the jacket of the grinding chamber is surrounded by a cooling jacket through which a cooling medium can be conducted. This can further support the control of the temperature of the ground material.
  • the agitator ball mill comprises a cylindrical grinding chamber 1, which is delimited by a jacket 2 and one end wall 3 on the inlet side and one end wall 4 on the outlet side.
  • the stirring elements 11, 12 and 13 are designed as accelerators; they are connected to the stirring shaft 5 in a rotationally fixed manner and are rotationally driven by the stirring shaft 5 during operation.
  • the inlet-side end wall 3 there is an inlet 6 for supplying material to be ground and grinding media into the grinding chamber 1, and in the outlet-side end wall 4 there is an outlet 7 for removing the ground material, which is removed by a separator screen 8, which retains the grinding media, from the Grinding chamber 1 is separated.
  • an annular channel 9 which is open towards the interior of the grinding chamber 1 educated.
  • the stirring shaft 5 and thus the stirring elements 11, 12, 13 (here: the accelerators) which are connected to it in a rotationally fixed manner are set in rotation by an external motor (not shown).
  • the stirring elements 11, 12 and 13 can, as shown, be constructed in the manner of a paddle wheel or else, for example, as simple stirring disks.
  • the grinding chamber 1 is surrounded by an outer cooling jacket 10 in such a way that an annular cavity 15 is formed between the cooling jacket 10 and the jacket 2 of the grinding chamber 1, through which a cooling medium can be conducted if required.
  • the supply and discharge lines for the cooling medium are not shown for the sake of simplicity.
  • the agitator ball mill according to the invention corresponds to the state of the art in terms of structure and function, for example as described above EP 3 102 332 B1 is represented. The person skilled in the art therefore does not need any further explanation.
  • the agitator ball mill is equipped with an induction heater which comprises a coil 20 as an inductor which, during operation of the agitator ball mill, is supplied by a high-frequency generator G shown only symbolically in the drawing is powered by alternating current.
  • the induction heating also includes a susceptor. The coil 20 is arranged outside the grinding chamber 1 in the cavity 15 formed between the cooling jacket 10 and the jacket 2 of the grinding chamber.
  • the coil 20 supplied with alternating current generates an (electro)magnetic alternating field which penetrates through the jacket 2 of the grinding chamber 1 into the interior of the grinding chamber, since the jacket 2 of the grinding chamber 1 consists of an electrically and magnetically non-conductive material.
  • the alternating magnetic field acts on the stirring elements 11, 12 and 13, which are made of a suitable electrically conductive material here, e.g. chrome steel or nickel-based alloys, which is also suitable for the grinding process, and generates eddy currents in them, which the stirring elements 11, 12 and 13 heat.
  • the in this way in the stirring elements 11, 12 And 13 generated heat is transferred from the stirring elements 11, 12 and 13 to the material to be ground and heats it.
  • the jacket 2 of the grinding chamber 1 consists of a material through which the magnetic field of the coil 20 can penetrate as unhindered as possible.
  • the material of the jacket 2 of the grinding chamber 1 is therefore neither electrically nor magnetically conductive, as already mentioned.
  • a suitable material for the shell 2 of the grinding chamber 1 is, for example, a ceramic, for example silicon carbide.
  • the stirring elements 11, 12 and 13 consist as a whole of an electrically conductive susceptor material in which eddy currents can be induced.
  • the stirring elements 11, 12 and 13 can also only partially consist of a susceptor material or comprise such a susceptor material, in which case the remaining stirring element then consists of a material with high thermal conductivity and must also be suitable for the grinding process .
  • a magnetic shield 30 surrounding the coil 20 on the outside and on the side concentrates the magnetic field generated by the coil 20 inward on the stirring elements 11, 12 and 13.
  • the stirring shaft 5 can consist of an electrically and magnetically non-conductive material, so that it itself can the magnetic field of the coil 20 is not heated.
  • the exemplary embodiment of the agitator ball mill according to the invention differs from the exemplary embodiment according to FIG 1 only because instead of the single coil 20, which extends almost over the entire length of the grinding chamber 1, there are three axially shorter coils 21, 22 and 23, which can be controlled separately and are arranged along the grinding chamber in such a way that they each form one of the stirring elements 11, 12 and 13 enclose radially.
  • the inductor is thus formed by the three coils 21, 22 and 23 here.
  • Three magnetic shields 31, 32 and 33 concentrate the magnetic fields of the coils 21, 22 and 23 on the stirring elements 11, 12 and 13 and shield the magnetic fields from the outside. All other parts of the agitator ball mill are the same as in the embodiment of FIG 1 and accordingly bear the same reference numbers.
  • the magnetic fields generated by the three coils 21, 22 and 23 act only on the stirring element 11 or 12 or 13 radially opposite the respective coil.
  • the division of the inductor into (here) three independent coils 21, 22 and 23 allows an (axially ) Zone-by-zone different heating of the regrind, which is an advantage in certain applications.
  • the coils 21, 22 and 23 can be controlled individually, which can be done either by means of three independent high-frequency generators or by means of a high-frequency generator with several outputs.
  • zone-wise control of the temperature of the material to be ground can be achieved.
  • the control of the temperature can also be supported by cooling by means of a cooling medium that can be conducted through the cavity 15 .
  • the coil 20 or the coils 21, 22 and 23 are fed by the high-frequency generator G shown only schematically in the drawing.
  • the working frequency of the high-frequency generator G can be in the range from 1 kHz to 1 MHz.
  • the induction heating has a natural frequency that is given by the coil or coils and the susceptors or stirring elements.
  • the operating frequency of the generator G for feeding the coil or coils with alternating current (which has this operating frequency) is as close as possible to or at the natural frequency of the induction heating.
  • the optimum working frequency can be determined empirically.
  • the invention was explained above using exemplary embodiments, but should not be limited to these exemplary embodiments. Rather, numerous modifications are conceivable for the person skilled in the art without deviating from the teaching of the invention.
  • more or fewer than three stirring elements can be provided in the grinding chamber and the stirring elements can be designed as desired.
  • the induction heating can also include only two or more than three inductor coils.
  • one of these coils can also have two or act on several agitators at the same time. The scope of protection is therefore defined by the following claims.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Crushing And Grinding (AREA)
  • General Induction Heating (AREA)

Claims (6)

  1. Broyeur à boulets à agitateur, comprenant une chambre de broyage (1) qui présente une enveloppe (2), et comprenant en outre un arbre agitateur (5) monté avec possibilité de rotation, qui avance dans la chambre de broyage (1) et sur lequel est disposé au moins un élément d'agitation (11, 12, 13), à l'intérieur de la chambre de broyage (1), comprenant une entrée (6) destinée à l'amenée de matières à broyer et de corps de broyage dans la chambre de broyage, ainsi qu'une sortie (7) destinée au prélèvement des matières broyées, et comprenant un chauffage à induction comportant un inducteur et un suscepteur, pour les matières à broyer se trouvant dans la chambre de broyage (1), l'au moins un élément d'agitation (11, 12, 13) comprenant le suscepteur, l'inducteur comportant au moins une bobine (20 ; 21, 22, 23) disposée à l'extérieur de l'enveloppe (2) de la chambre de broyage (1) et entourant la chambre de broyage (1), et l'enveloppe (2) de la chambre de broyage (1) étant constituée d'un matériau non conducteur électrique et magnétique.
  2. Broyeur à boulets à agitateur selon la revendication 1, dans lequel deux ou plusieurs éléments d'agitation (11, 12, 13) sont disposés sur l'arbre agitateur (5) en étant espacés les uns des autres le long de l'arbre agitateur, et dans lequel l'inducteur comprend deux ou plusieurs bobines (21, 22, 23) qui sont disposées le long de l'enveloppe (2) de la chambre de broyage (1) de manière à ce que le champ magnétique généré par elles n'agisse respectivement que sur l'un des éléments d'agitation (11, 12, 13).
  3. Broyeur à boulets à agitateur selon la revendication 2, dans lequel les bobines (21, 22, 23) sont réalisées de manière à pouvoir être commandées séparément.
  4. Broyeur à boulets à agitateur selon l'une des revendications précédentes, qui comprend un générateur de hautes fréquences (G) destiné à alimenter la bobine (20) ou les bobines (21, 22, 23) en courant alternatif d'une fréquence de travail du générateur de hautes fréquences (G), la fréquence de travail du générateur de hautes fréquences se situant dans la plage allant de 1 kHz à 1 MHz.
  5. Broyeur à boulets à agitateur selon la revendication 4, dans lequel le chauffage à induction (20, 11, 12, 13 ; 21, 22, 23, 11, 12, 13) présente une fréquence propre, et dans lequel la fréquence de travail du générateur de hautes fréquences (G) est égale ou proche de la fréquence propre du chauffage à induction.
  6. Broyeur à boulets à agitateur selon l'une des revendications précédentes, dans lequel l'enveloppe (2) de la chambre de broyage (1) est entourée d'une enveloppe de refroidissement (10) à travers laquelle on peut faire passer un fluide de refroidissement.
EP21208681.3A 2020-11-18 2021-11-17 Broyeur à boulets à agitateur Active EP4000735B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20208296 2020-11-18

Publications (3)

Publication Number Publication Date
EP4000735A1 EP4000735A1 (fr) 2022-05-25
EP4000735B1 true EP4000735B1 (fr) 2023-08-02
EP4000735C0 EP4000735C0 (fr) 2023-08-02

Family

ID=73475952

Family Applications (1)

Application Number Title Priority Date Filing Date
EP21208681.3A Active EP4000735B1 (fr) 2020-11-18 2021-11-17 Broyeur à boulets à agitateur

Country Status (7)

Country Link
US (2) US11919007B2 (fr)
EP (1) EP4000735B1 (fr)
JP (1) JP2022081453A (fr)
KR (1) KR20220068155A (fr)
CN (1) CN114534866A (fr)
ES (1) ES2961896T3 (fr)
PL (1) PL4000735T3 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3146415A1 (fr) * 2023-03-07 2024-09-13 Institut National De Recherche Pour L'agriculture, L'alimentation Et L'environnement Broyeur polyvalent
KR102648873B1 (ko) 2024-01-18 2024-03-20 주식회사 하이리온 핫 볼 밀 장치

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3642330A1 (de) * 1986-12-11 1988-06-23 Basf Ag Ruehrwerksmuehle zum mahlen von pigmenten
JP3132267B2 (ja) * 1993-11-02 2001-02-05 株式会社村田製作所 セラミック熱処理装置
JPH0724439U (ja) 1993-10-01 1995-05-09 三井鉱山株式会社 粉砕機の構造
JP2001180933A (ja) 1999-12-22 2001-07-03 Nippon Shokubai Co Ltd チタンブラック分散液およびその製造方法
DE10064828B4 (de) 2000-12-22 2007-07-12 Erich Netzsch Gmbh & Co Holding Kg Rührwerksmühle
JP2009000633A (ja) 2007-06-21 2009-01-08 Nisshin Engineering Co Ltd 回転型処理装置
EP2905080A1 (fr) 2014-02-07 2015-08-12 Willy A. Bachofen AG Broyeur à billes à agitateur
KR101822480B1 (ko) 2017-05-22 2018-03-08 유태호 폐기물을 이용하고 생산성이 향상된 유기질비료 제조방법
FR3081732B1 (fr) 2018-05-29 2020-09-11 Deasyl Sa Broyeur tridimensionnel, son procede de mise en œuvre et ses utilisations

Also Published As

Publication number Publication date
US20220152621A1 (en) 2022-05-19
CN114534866A (zh) 2022-05-27
US20240253052A1 (en) 2024-08-01
KR20220068155A (ko) 2022-05-25
US11919007B2 (en) 2024-03-05
PL4000735T3 (pl) 2024-03-18
EP4000735C0 (fr) 2023-08-02
ES2961896T3 (es) 2024-03-14
EP4000735A1 (fr) 2022-05-25
JP2022081453A (ja) 2022-05-31

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