EP3536405A1 - Moulin à agitateur pourvu de dispositif de tige asynchrone - Google Patents

Moulin à agitateur pourvu de dispositif de tige asynchrone Download PDF

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Publication number
EP3536405A1
EP3536405A1 EP18160426.5A EP18160426A EP3536405A1 EP 3536405 A1 EP3536405 A1 EP 3536405A1 EP 18160426 A EP18160426 A EP 18160426A EP 3536405 A1 EP3536405 A1 EP 3536405A1
Authority
EP
European Patent Office
Prior art keywords
tools
rotor
longitudinal axis
central longitudinal
rows
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Withdrawn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
EP18160426.5A
Other languages
German (de)
English (en)
Inventor
Hans Kabbe
Eduard Nater
Achim Sturm
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.)
Buehler AG
Original Assignee
Buehler 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 Buehler AG filed Critical Buehler AG
Priority to EP18160426.5A priority Critical patent/EP3536405A1/fr
Priority to PCT/EP2019/055426 priority patent/WO2019170661A1/fr
Publication of EP3536405A1 publication Critical patent/EP3536405A1/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Withdrawn legal-status Critical Current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
    • 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

Definitions

  • the invention relates to a stirred mill according to the preamble of claim 1.
  • Tools for shredding the product are on the one hand on the rotatably mounted rotor (also called rotor pins) and also fixed to the container wall (also called stator pins). They are usually arranged offset from one another in such a way that the rows of rotor pins can pass between the rows of stator pins during a rotational movement of the rotor.
  • the suspension is passed through a feed channel into the grinding chamber of the agitator mill and the solids are there distributed or comminuted with the aid of the grinding media and the tools.
  • the finished product is then directed via a Mahlgut-discharge channel through a MahlSystemtrenn issued, in particular in the form of a protective sieve, to a drain line.
  • stator and stator pins are evenly distributed.
  • the number of stator pins can be equal to the number of rotor pins or half in the circumferential direction. For example, mills are known which have 12 rows of 14 pins arranged in the direction of the rotor axis on the rotor and 12 rows of 13 pins on the stator.
  • the pins are arranged so that they do not meet axially. For example, since when changing the grinding media, the rotor is moved out in the axial direction, the pins could otherwise be damaged in this process.
  • the invention has for its object to prevent the blocking of the agitator mill when starting or stopping. As a result, the power required during startup is reduced and less vibration occurs during operation.
  • the essence of the invention is that, due to an irregular distribution of the tools or rotor and / or stator pins or a change in the number, all the tools or pins do not hit each other at the same time, and blocking can thus effectively be prevented.
  • the object is achieved by an agitator mill having the following features.
  • the agitator mill has a grinding container and a grinding chamber which is delimited by a container wall and an agitator which can be rotated about the central longitudinal axis and has a rotationally symmetrical rotor.
  • the grinding chamber can be filled at least partially with auxiliary grinding bodies.
  • first tools are mounted in the circumferential direction and in the direction of the central longitudinal axis, which extend in the direction of the container wall and on the container wall in the circumferential direction and in the direction of the central longitudinal axis, second tools are mounted, which extend in the direction of Rotor extend.
  • the first tools are mounted in the direction of the central longitudinal axis so that they can pass between the rows of second tools during a rotational movement of the rotor.
  • the first tools mounted on the rotor and / or the second tools mounted on the container wall may be circumferentially offset at different angles to each other, the angles being measured in the plane perpendicular to the central longitudinal axis. If the first tools are offset from one another at different angles, the second tools can be arranged uniformly in the circumferential direction, spaced at equal angles, and vice versa.
  • the attached to the container wall second tools may be offset, for example in the circumferential direction in angles of 55 °, 70 °, 55 °, 55 °, 70 °, 55 ° to each other.
  • the angles between the first tools in the circumferential direction may each be the same angle, in particular 30 ° or 60 °.
  • the number of first tools attached to the rotor and the number of second tools attached to the container wall can not be a multiple of each other, in particular per row in the circumferential direction.
  • the tools mounted on the rotor or on the container wall can form the shape of a J in a row in the direction of the central longitudinal axis.
  • the tools of this arranged in the direction of the central longitudinal axis series not simultaneously, but in succession between adjacent tools of the opposite row.
  • the tools mounted on the rotor or on the container wall in a row in the direction of the central longitudinal axis may form a C or an S shape.
  • the auxiliary grinding bodies are preferably ceramic beads, which typically have a diameter of less than 1.25 mm, preferably 0.02 mm to 0.8 mm.
  • Mahltosêt can also be designed as hard metal beads, steel beads or glass beads.
  • stones or sand can be used as a grinding auxiliary body.
  • the invention further provides a rotor for a stirred mill, wherein the rotor can be offered as a spare part for an existing mill.
  • the rotor according to the invention has asymmetrically arranged tools, wherein, for example, at least one row of the tools is not parallel to the direction of the central longitudinal axis, or in which tools in the form of a C, a J, or an S are arranged.
  • Fig. 1 shows a section of a stirred mill according to the prior art.
  • agitator mill has in the usual way a grinding container 2 with an internal grinding chamber 8.
  • the grinding chamber 8 is at least partially filled with grinding bodies 43 having a diameter c.
  • the diameter of the grinding media is usually smaller than 1.25 mm and is typically 0.02 mm ⁇ c ⁇ 0.8 mm.
  • the agitator mill further comprises an inner stator 22 and a rotor 35 rotatable about a central longitudinal axis 19. On the rotor 35 first tools 38 are mounted, which protrude into the grinding chamber 8. On the container wall 9 or on the stator second tools 74 are mounted, which protrude into the grinding chamber 8.
  • the first tools 38 and the second tools 74 are arranged on the one hand in the direction of the central longitudinal axis 19 in rows and on the other hand arranged in rows in the circumferential direction.
  • the circumferential direction can also be considered as a plane perpendicular to the central longitudinal axis 19.
  • the rows of first tools 38 and second tools 74 are on perpendicular to each other arranged lines.
  • the first tools 38 and second tools 74 are offset relative to one another in the direction of the central longitudinal axis 19 in such a way that the first tools 38 rotate about the central longitudinal axis 19 between the rows of second tools 74 during a rotational movement of the rotor 35 can pass through.
  • the first tools 38 and second tools 74 are preferably designed in the form of pins, in particular as round or cylindrical pins, which optionally identify nubs or profiled in any other way.
  • the tools 38, 74 can also be made in any other form, such as, for example, as cams or diamonds.
  • the processed millbase is passed through a gap between the rotor 35 and the inner stator 22 to a protective screen 30, the grinding media 43 stops, and flows through a drain line 31 from.
  • Fig. 2 shows by way of example a first embodiment of the invention as a section through the rotor 35 and container wall 9 and the enclosed grinding chamber 8 in the plane perpendicular to the central longitudinal axis 19.
  • the first tools 38 and rotor pins are evenly distributed in the circumferential direction at angles of 30 ° and protrude into the grinding chamber 8.
  • the second tools 74 and stator pins are non-uniformly arranged at angles of 55 ° - 70 ° - 55 ° - 55 ° - 70 ° - 55 ° to each other and protrude into the grinding chamber 8.
  • the container wall 9 has about half as many tools 74 as the rotor 35, due However, in asymmetric distribution, fewer tools 38, 74 collide at a time.
  • Fig. 3 shows an alternative of the second embodiment of the invention as a section through the rotor 35 and container wall 9 and the enclosed grinding chamber 8 in the plane perpendicular to the central longitudinal axis 19.
  • the second tools 74 and stator pins are non-uniform in the circumferential direction at angles of 65 ° - 50 ° - 65 ° - 65 ° - 50 ° - 65 ° to each other, while the first tools 38 and rotor pins are offset in the circumferential direction uniformly at angles of 30 ° to each other.
  • Fig. 4 shows by way of example a second embodiment of the invention as a section through rotor 35 and container wall 9 and the grinding chamber enclosed therein 8 in the plane perpendicular to the central longitudinal axis 19.
  • the number of first tools 38 and second tools 74 is selected so that they do not form a multiple of each other.
  • ten first tools 38 are each mounted on the rotor 35 at an angle of 36 ° to each other, while the container wall 9 has six second tools 74, each at an angle of 60 ° to each other.
  • the embodiment just described is not limited to this distribution of tools, but other distributions may be convenient without departing from the spirit of the invention.
  • FIG. 5 schematically shows sections of rotor 35 and container wall 9 along the central longitudinal axis 19, each having a row of first tools 38 and second tools 74th
  • Fig. 5a an arrangement according to the prior art is shown.
  • the row of first tools 38 is arranged in the circumferential direction at the same distance from the row of second tools 74 and parallel to the central longitudinal axis 19.
  • Fig. 5b shows one of the possible embodiments of the invention.
  • the first tools 38 are offset in the circumferential direction so that they form the shape of a J in the direction of the central longitudinal axis 19.
  • Fig. 5c shows another possible embodiment in which the first tools 38 in the direction of the central longitudinal axis 19 form the shape of a C.
  • Fig. 5d shows a further possible embodiment in which the first tools 38 in the direction of the central longitudinal axis 19 form the shape of an S. In all three embodiments it is achieved that fewer tools 38, 74 meet at the same time and thus the risk of blocking when starting is reduced.
  • Figures 6a and 6b show further alternatives of the third embodiment, wherein at least one of the rows of first tools 38 or second tools 74 are not aligned parallel to the central longitudinal axis 19, wherein in the circumferential direction per row, the distance between the tools is the same.
  • FIGS. 6c and 6d show further possible embodiments in which the second tools 74 are arranged in the axial direction on a kinked line, wherein no part of the line is parallel to the central longitudinal axis 19.
  • Fig. 7 shows a section through rotor 35 and container wall 9, wherein the first tools 38 and the second tools 74 according to the third embodiment, according to Fig. 6b , are arranged.
  • the embodiments just described solve the problem described above and the agitator mill is less prone to blocking. Since the tools 38, 74 are not arranged uniformly and thus fewer tools 38, 74 engage in one another at the same time, the risk of blocking due to the compact grinding media product bed can be reduced. As a result, the torque required for starting can be reduced, vibrations are reduced and the wear of the tools 38, 74 slows down, whereby the ground material can be processed more efficiently and faster. Furthermore, therefore, a smaller motor can be used, which can work space and energy efficient.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
EP18160426.5A 2018-03-07 2018-03-07 Moulin à agitateur pourvu de dispositif de tige asynchrone Withdrawn EP3536405A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP18160426.5A EP3536405A1 (fr) 2018-03-07 2018-03-07 Moulin à agitateur pourvu de dispositif de tige asynchrone
PCT/EP2019/055426 WO2019170661A1 (fr) 2018-03-07 2019-03-05 Broyeur à agitateur avec ensemble de tiges asynchrone

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP18160426.5A EP3536405A1 (fr) 2018-03-07 2018-03-07 Moulin à agitateur pourvu de dispositif de tige asynchrone

Publications (1)

Publication Number Publication Date
EP3536405A1 true EP3536405A1 (fr) 2019-09-11

Family

ID=61581101

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EP18160426.5A Withdrawn EP3536405A1 (fr) 2018-03-07 2018-03-07 Moulin à agitateur pourvu de dispositif de tige asynchrone

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EP (1) EP3536405A1 (fr)
WO (1) WO2019170661A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4032615A1 (fr) 2021-01-25 2022-07-27 Wilhelm Niemann GmbH & Co KG Broyeur agitateur
EP4088816A1 (fr) 2021-05-11 2022-11-16 Omya International AG Plaques d'usure pour broyeurs agitateurs

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110860344B (zh) * 2019-11-18 2021-02-09 合肥昊泰新材料科技有限责任公司 一种水性涂料制备预分散处理装置及处理方法

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2851256A (en) * 1955-01-13 1958-09-09 American Mach & Foundry Closed continuous mixer
EP1992412A1 (fr) 2005-10-11 2008-11-19 Bühler Ag Moulin mélangeur agitateur

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2851256A (en) * 1955-01-13 1958-09-09 American Mach & Foundry Closed continuous mixer
EP1992412A1 (fr) 2005-10-11 2008-11-19 Bühler Ag Moulin mélangeur agitateur

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4032615A1 (fr) 2021-01-25 2022-07-27 Wilhelm Niemann GmbH & Co KG Broyeur agitateur
DE102021101527A1 (de) 2021-01-25 2022-07-28 Wilhelm Niemann Gmbh & Co. Rührwerksmühle
DE102021101527B4 (de) 2021-01-25 2023-05-17 Wilhelm Niemann Gmbh & Co. Rührwerksmühle
EP4088816A1 (fr) 2021-05-11 2022-11-16 Omya International AG Plaques d'usure pour broyeurs agitateurs
WO2022238227A1 (fr) 2021-05-11 2022-11-17 Omya International Ag Plaques d'usure pour broyeurs à agitateur

Also Published As

Publication number Publication date
WO2019170661A1 (fr) 2019-09-12

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