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WO2004020097A1 - Moulin a agitateur pourvu d'une zone de travail basculable - Google Patents

Moulin a agitateur pourvu d'une zone de travail basculable Download PDF

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Publication number
WO2004020097A1
WO2004020097A1 PCT/CH2003/000559 CH0300559W WO2004020097A1 WO 2004020097 A1 WO2004020097 A1 WO 2004020097A1 CH 0300559 W CH0300559 W CH 0300559W WO 2004020097 A1 WO2004020097 A1 WO 2004020097A1
Authority
WO
WIPO (PCT)
Prior art keywords
agitator mill
mill according
agitator
grinding chamber
grinding
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.)
Ceased
Application number
PCT/CH2003/000559
Other languages
German (de)
English (en)
Inventor
Armin Geiger
Olaf EICHSTÄDT
Elias MÜDESPACHER
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 EP03790610A priority Critical patent/EP1531938A1/fr
Priority to AU2003250718A priority patent/AU2003250718A1/en
Publication of WO2004020097A1 publication Critical patent/WO2004020097A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • B02C17/161—Arrangements for separating milling media and ground material
    • 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
    • B02C17/18—Details

Definitions

  • the invention relates to an agitator mill according to the preamble of claim 1.
  • Such agitator mills have a grinding chamber containing grinding media, a stator and a rotor which are arranged in the grinding chamber, a grinding material inlet opening and a grinding material outlet opening for supplying and removing ground material into and from the grinding chamber, and one upstream in the grinding chamber from the outlet opening arranged grinding media separating device, which serves to separate grinding media carried in the grinding stock from the grinding stock before it is discharged through the outlet opening from the grinding chamber.
  • Agitator mills are used in the food sector and in the production of fine particles down to the nano range. Particles or agglomerates emulsified in a liquid are conveyed into the grinding chamber and comminuted or dispersed in the grinding chamber with the aid of auxiliary grinding bodies before they are conveyed out of the grinding chamber. So that the grinding aids are not dragged out of the agitator mill by the liquid millbase during this wet grinding process and thus the agitator mill is lost and contaminate the millbase, the grinding aids are retained in the grinding chamber by a separating device. Separating gaps, separating screens or cellular wheels are used as separating devices. Beads made of steel, ceramic or plastic can be used as auxiliary grinding bodies.
  • the grinding aids have to be replaced and the separating device cleaned or replaced after certain operating intervals.
  • the separating device and the space surrounding it are not easily accessible to a maintenance person, which makes the removal and reinstallation of the separating device difficult.
  • the invention is therefore based on the object of providing an agitator mill of the type described at the outset which enables good access to the separating device for its simple replacement without lowering the auxiliary grinding bodies and which furthermore enables the use of separating devices in which only in the "active" operating state the separation effect begins.
  • the grinding chamber with the stator and rotor arranged in it and with the separating device can be pivoted into a pivoting position in such a way that the separating device comes to an elevated location which is higher than a large part of the grinding chamber volume, the separating device can be removed without draining the Grinding aid body enables, since the grinding aid body does not reach the height of the separating device in the pivoted position.
  • the invention enables the use of a rotatable separating device with spoke-like or sheet-like elements, such as a spoke wheel, paddle wheel or cellular wheel, in an agitator mill, the separating action of the separating device only coming about when it starts to rotate.
  • the separating device can be put into operation in this case as long as the process zone is tilted and the separating device is located at the elevated location. After commissioning, the process zone is then tilted into the operating position in which the auxiliary grinding bodies reach the separating device which now acts as a separator.
  • the 'large part of the grinding chamber volume takes up between 50% and 100% of the mill chamber volume.
  • the pivoted, high location of the separating device is expediently the highest possible location of the separating device that can be reached by pivoting. This facilitates access to the separation device.
  • auxiliary grinding bodies which are located in or on the separating device, can be poured out or stripped into the grinding chamber without problems above the opening.
  • the agitator mill according to the invention, it comprises an agitator unit which essentially consists of the grinding container forming the stator and the rotor forming the agitator, and a motor unit which essentially consists of the motor, the agitator unit , the motor unit and a belt overdrive together form a unit which can be pivoted about the pivot axis. In this way, the mass to be pivoted is kept as low as possible.
  • the pivot axis preferably runs through the pivotable unit, it being particularly advantageous if the pivot axis runs through the center of gravity of the pivotable unit. In this way, the forces to be applied for the pivoting or! Torques kept low or practically completely eliminated.
  • the axis of rotation of the agitator unit and the axis of rotation of the motor unit expediently run parallel to one another. It is particularly advantageous if the pivot axis both the axis of rotation of the agitator unit and the axis of rotation of the motor unit are preferably at right angles cuts. If “the ratio between the length and the diameter of both the agitator unit and the motor unit is less than 2 and preferably in the range of 1, this orientation of the pivot axis enables a relatively small moment of inertia of the pivotable unit with respect to the pivot axis achieve. This also facilitates the pivoting of the pivotable unit.
  • the pivot axis can also run through the spatial area which extends between the axis of rotation of the agitator unit and the axis of rotation of the motor unit, preferably the axis of rotation of the agitator unit and the axis of rotation of the motor. Aggregate lie in the same spatial plane and the pivot axis is perpendicular to this spatial plane.
  • This arrangement of the pivot axis is advantageous if the ratio between length and diameter is particularly large in the agitator unit and / or the motor unit, in particular if it is greater than 2 and preferably greater than 3, and at the same time the distance between the axis of rotation of the agitator unit and the axis of rotation of the motor unit is small.
  • a relatively small moment of inertia of the pivotable unit with respect to the pivot axis is then also achieved for this spatial shape of the pivotable unit.
  • the aim is to align the pivot axis with respect to the pivotable unit consisting of agitator unit and motor unit in such a way that the moment of inertia of the pivotable unit with respect to the pivot axis is as small as possible and preferably minimized.
  • the separation device can e.g. a separating sieve, a paddle wheel or a separating gap.
  • the separating sieve is preferably a self-cleaning separating sieve.
  • the pivoting position is preferably a non-operating position of the agitator mill, the rotor axis of rotation in particular being essentially horizontal in the operating position of the agitator mill and vertical in the pivoting position or is arranged approximately vertically, for example at an angle of up to approximately 30 ° to the vertical.
  • the rotor has essentially the shape of a rotationally symmetrical body and the stator is formed by an essentially complementary inner surface of the grinding chamber.
  • the stator is formed by an essentially complementary inner surface of the grinding chamber.
  • the regrind inlet opening is arranged in a radially outer region of the grinding chamber and the regrind outlet opening is arranged in a radially inner region of the grinding chamber.
  • an equilibrium is then established on the auxiliary grinding bodies between a radially outwardly directed centrifugal force component due to the rotation of the rotor about its axis of rotation and a radially inwardly directed drag force component due to the ground material flowing radially from the outside inwards.
  • the flow of the ground material is e.g. maintained by a separate pump.
  • This centrifugal force effect achieves a "dynamic" relief of the separating device arranged radially on the inside in the regrind outlet area, i.e.
  • auxiliary grinding bodies float more or less stationary in the radially outer areas of the process space and form a "swarm" of auxiliary grinding bodies through which the material to be ground is pumped.
  • the few grinding media entering the radially inner area of the process space are then intercepted by the separating device. This protects the separating device and wears it down less.
  • the rotor can essentially have the shape of a truncated cone, the grinding stock inlet opening being arranged in the region of the broad truncated cone end and the grinding stock outlet opening being arranged in the region of the narrow truncated cone end of the grinding chamber.
  • the rotor can also have essentially the shape of a double truncated cone.
  • the regrind is preferably pumped from the radially outside to the radially inside.
  • the rotor can essentially have the shape of a cylinder, the regrind inlet opening being arranged in the region of the first cylinder end and the regrind outlet opening in the region of the second cylinder end of the grinding chamber, and the regrind being essentially helical along the cylinder jacket of the rotor the process room is transported.
  • the rotor is essentially in the form of a disk, the regrind inlet opening being arranged in the radially outer peripheral region and the regrind outlet opening being arranged in the radially inner axial region of the grinding chamber, so that the regrind in turn from the outside flows inside through the process space.
  • the above-described equilibrium of a centrifugal force component and a drag force component is established on the grinding auxiliary bodies during operation.
  • the regrind pumped from the outside then brings about the "dynamic" relief of the separating device arranged radially on the inside.
  • the rotor and the stator expediently have pins on their surface which intensify the grinding action of the auxiliary grinding bodies.
  • the disk-shaped rotor has pins both on its two flat disk surfaces and on its peripheral surface.
  • the radially outermost pins have the highest speed of all pins during operation.
  • a large part of the auxiliary grinding bodies float radially outwards, a substantial part of the grinding action takes place in this peripheral area of the process space alone, so that a significant increase in grinding performance is achieved compared to an agitator mill without pins on the edge of the disc.
  • FIG. 2 is a perspective view of the agitator mill of FIG. 1 in a tilted inoperative or maintenance position;
  • FIG. 3 is an enlarged perspective view similar to FIG. 2 of the agitator mill according to the invention with the separating device removed;
  • FIG. 4 is a perspective view similar to FIG. 1 of the agitator mill according to the invention.
  • Figure 5 is a perspective view of the agitator mill of Figure 4 with the process zone open;
  • Fig. 6 is a schematic representation of the pivotable unit.
  • FIG. 1 shows an agitator mill according to the invention in its operating position with a horizontal rotor axis of rotation.
  • the agitator mill is attached to a vertical element 2, which is connected to a machine base 1.
  • a motor 3 drives a belt pulley 5 via a belt overdrive 4, which is connected in a rotationally fixed manner to the rotor 21 (see FIG. 5) of the agitator mill via a drive shaft 6 arranged under a casing 8 (see FIG. 4).
  • the rotationally driven rotor 21 rotates in the grinding chamber 9.
  • the ground material to be ground enters the grinding chamber 9 via a grinding material inlet opening 11 which is arranged radially on the outside of the grinding chamber 9 and leaves the grinding chamber 9 via a grinding material outlet opening which is arranged radially on the inside of the grinding chamber 12.
  • the grinding chamber consists essentially of three parts, namely a first flat grinding chamber wall 13, a curved grinding chamber wall 14 on the circumference of the grinding chamber and a second flat grinding chamber wall 15.
  • the curved grinding chamber wall 14 and the second flat grinding chamber wall 15 are firmly connected to one another.
  • This unit 14, 15 is hinged to the first flat grinding chamber wall 13 via a hinge 10.
  • a cylindrical screen jacket 16 is fixedly connected to the second flat grinding chamber wall 15, which chamber wall 15 is arranged centrally and axially projecting outwards.
  • a separating device 18 in the form of a cylindrical separating sieve is located within this sieve jacket 16 (see FIG. 3).
  • the regrind outlet opening 12 is formed by an axially extending tube which opens into the interior of the cylindrical separating sieve 18. Below the outlet opening 12 there is arranged a product trough 17 which runs obliquely downwards.
  • FIG. 2 shows the agitator mill according to the invention from FIG. 1 in the tilted state with a vertical axis of rotation of the rotor.
  • the reference numerals and the elements corresponding to them are the same as in FIG. 1.
  • all functional elements 3 to 17 of the agitator mill are tilted by 90 ° about a horizontal pivot axis. Only the machine base 1 and the vertical element 2 are in the same position as in FIG. 1. In this tilted position, the screen jacket 16 is more easily accessible, so that the separating screen 18 (see FIG. 3) can be removed and installed more easily during maintenance can.
  • grinding aid bodies (not shown) adhering or clamped to the separating sieve can easily be stripped or shaken off into the grinding chamber 9.
  • FIG. 3 shows the tilted agitator mill according to the invention similar to that in FIG. 2, but somewhat enlarged.
  • the reference numbers and the elements corresponding to them are the same as in FIG. 1 and in FIG. 2.
  • the separating screen 18 is shown in the removed state.
  • the cylindrical separating sieve 18 has a flange 19 with holes on its upper cylinder edge, via which the separating sieve 18 is fastened to the sieve jacket 16 by screws 20 when it is reinstalled.
  • the removal and installation of the separating screen 18 would not be possible in the operating position with the horizontal rotor axis of rotation (see FIG. 1).
  • the grinding media would have to be drained beforehand.
  • the agitator mill according to the invention owing to its tiltability, enables the use of another separating device instead of the "passive" separating sieve, such as a cellular wheel or a paddle wheel, which can separate grinding auxiliary bodies only in the operating state, ie during rotation. If the agitator mill equipped with such an "active" separation device is to be stopped, it can be tilted into the vertical position with a vertical axis of rotation beforehand. The procedure is reversed when starting up again.
  • the The rotor and the "active" separating device are set in rotation while the agitator mill is still tilted with the vertical axis of rotation, so that the separating effect of the "active" separating device is restored, whereupon the agitator mill is tilted back into the horizontal operating position with the horizontal axis of rotation.
  • FIG. 4 shows the agitator mill according to the invention somewhat enlarged than in FIG. 1.
  • the reference numbers and the elements corresponding to them are the same as in FIG. 1, FIG. 2 and FIG. 3.
  • the casing 8 has been omitted here , so that the drive axle 6 and the control unit 7 can be seen.
  • FIG. 5 shows the agitator mill of FIG. 4 with the process zone open, ie in a state in which the grinding chamber 9 is open.
  • the grinding chamber 9 was opened by pivoting the unit 14, 15, 16 consisting of the second flat grinding chamber wall 15, the curved grinding chamber wall 14 and the screen jacket 16 and hinged to the first flat grinding chamber wall 13 away from the grinding chamber wall 13.
  • the disk-shaped rotor 21 which is screwed to the drive shaft 6 (see FIG. 4) and is equipped with pins 22 on its flat surface areas and with further pins 23 on its curved edge area along the circumferential direction.
  • Corresponding pins which are arranged opposite to the pins 22 and radially offset from them, are also arranged on the stator surfaces, ie on the side of the grinding chamber walls 13 and 15 pointing into the process space. In the middle of the pivoted-away unit 14, 15, 16 one can see the separating screen 18 arranged concentrically within the screen jacket 16.
  • a special feature are the screen cleaning pins 26, which are also arranged on the rotor disk 21, but only on their side facing the grinding chamber wall 15.
  • These screen cleaning pins are arranged concentrically around the center of the rotor disk 21 and extend parallel to one another and to the rotor axis of rotation, so that they close when the grinding chamber is closed, ie when the unit 14, 15, 16 is pivoted back the space between the separating screen 18 and the screen jacket 16 protrude. All elements of the grinding chamber wall, ie the first flat grinding chamber wall 13, the curved grinding chamber wall 14 and the second flat grinding chamber wall 15 and the screen jacket 16 have cooling channels (not shown). Near the connection Parts between the screen cleaning pins 26 and the rotor disk 21 are holes 27 arranged concentrically around the center of the rotor disk 21 in the rotor disk 21, via which the two halves of the process space are connected.
  • the product to be ground (e.g. suspension with particles to be comminuted) is pumped through the inlet opening 11 into the grinding chamber 9, in which the driven rotor disk 21 rotates.
  • the interaction of the grinding media (not shown) and the pins 22, 23 on the rotor disk 21 and the pins 24, 25 on the stator comminute the particles suspended in the product.
  • the product wet-ground in this way when it passes from the outside in through the process space finally reaches the space between the separating sieve 18 and the sieve jacket 16 and passes through the separating sieve 18 to the outlet opening 12.
  • FIG. 6 is a schematic illustration of the pivotable unit (RA-MA) according to the invention, which is formed by an agitator unit RA, a motor unit MA and a belt exaggeration 4, not shown in FIG. 6 (see FIG. 1).
  • the axis of rotation 6 of the agitator unit RA and the axis of rotation 30 of the motor unit MA run parallel to one another and define a spatial plane which corresponds to the paper plane of FIG. 6.
  • the pivot axis 28, about which the pivotable unit RA-MA can be pivoted, runs through the center of gravity 29 of the pivotable unit RA-MA and intersects the axis of rotation 6 and the axis of rotation 30 of the agitator unit RA or of the motor unit MA in one right angle.
  • LR denotes the axial length of the agitator unit
  • DR denotes the diameter of the agitator unit RA
  • LM denotes the axial length of the motor unit
  • DM denotes the diameter of the motor unit MA.
  • D represents the distance between the axes of rotation 6, 30 of the agitator unit RA or the motor unit MA which run parallel to one another.
  • the arrangement of the pivot axis 28 shown in FIG. 6 achieves a low moment of inertia of the pivotable unit RA-MA with respect to the pivot axis 28.
  • the value of the distance D between the two axes of rotation 6 and 30 is irrelevant.
  • the ratio LR / DR and / or the ratio LM / DM is large, preferably greater than 2, an arrangement of the pivot axis 28 perpendicular to the spatial plane spanned by the two axes of rotation 6 and 30 is preferred, in particular then , even if the distance D between the two axes of rotation 6 and 30 is small.
  • This course of the pivot axis, not shown in FIG. 6, corresponds to the normal to the paper plane.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
  • Table Equipment (AREA)
  • Food-Manufacturing Devices (AREA)

Abstract

L'invention concerne un moulin à agitateur comportant une chambre de broyage contenant des corps de broyage, un stator et un rotor, qui sont disposés dans la chambre de broyage, une ouverture d'entrée de matière à moudre et une ouverture de sortie de matière moulue servant, respectivement, à l'amenée de matière à moudre dans ladite chambre de broyage et à l'évacuation de la matière moulue de ladite chambre de broyage, et un dispositif de séparation de corps de broyage qui est disposé en amont de l'ouverture de sortie et sert à séparer de la matière moulue les corps de moulage qui ont été entraînés avec elle, cela avant qu'elle soit évacuée de la chambre de broyage par l'ouverture de sortie. Selon l'invention, la chambre de broyage peut, avec son stator (13, 14, 15) et son rotor (21), et avec le dispositif de séparation (18), être mise dans une position basculée, de sorte que le dispositif de séparation (18) atteigne un emplacement élevé, notamment plus élevé qu'une grande partie du volume de la chambre de broyage.
PCT/CH2003/000559 2002-08-28 2003-08-19 Moulin a agitateur pourvu d'une zone de travail basculable Ceased WO2004020097A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP03790610A EP1531938A1 (fr) 2002-08-28 2003-08-19 Moulin a agitateur pourvu d'une zone de travail basculable
AU2003250718A AU2003250718A1 (en) 2002-08-28 2003-08-19 Mill provided with an agitator and a tilting working zone

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10240231.0 2002-08-28
DE10240231 2002-08-28

Publications (1)

Publication Number Publication Date
WO2004020097A1 true WO2004020097A1 (fr) 2004-03-11

Family

ID=31724222

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CH2003/000559 Ceased WO2004020097A1 (fr) 2002-08-28 2003-08-19 Moulin a agitateur pourvu d'une zone de travail basculable

Country Status (6)

Country Link
EP (1) EP1531938A1 (fr)
AT (1) ATE411847T1 (fr)
AU (1) AU2003250718A1 (fr)
DE (2) DE10313993A1 (fr)
ES (1) ES2315559T3 (fr)
WO (1) WO2004020097A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3023973A (en) * 1959-03-17 1962-03-06 Entoleter Centrifugal impacting apparatus
GB1277715A (en) * 1970-06-19 1972-06-14 Draiswerke Gmbh An improved stirrer mill
US5474237A (en) * 1995-02-28 1995-12-12 Eastman Kodak Company Method and apparatus for eliminating screen plugging in wet grinding mills
US5590841A (en) * 1994-01-28 1997-01-07 Stein; Juergen Agitator ball mill
US6405952B1 (en) * 1999-03-24 2002-06-18 Zoz Gmbh Superfine milling apparatus with pivotal milling chamber

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3023973A (en) * 1959-03-17 1962-03-06 Entoleter Centrifugal impacting apparatus
GB1277715A (en) * 1970-06-19 1972-06-14 Draiswerke Gmbh An improved stirrer mill
US5590841A (en) * 1994-01-28 1997-01-07 Stein; Juergen Agitator ball mill
US5474237A (en) * 1995-02-28 1995-12-12 Eastman Kodak Company Method and apparatus for eliminating screen plugging in wet grinding mills
US6405952B1 (en) * 1999-03-24 2002-06-18 Zoz Gmbh Superfine milling apparatus with pivotal milling chamber

Also Published As

Publication number Publication date
AU2003250718A1 (en) 2004-03-19
EP1531938A1 (fr) 2005-05-25
DE10313993A1 (de) 2004-03-18
ES2315559T3 (es) 2009-04-01
ATE411847T1 (de) 2008-11-15
DE50310677D1 (de) 2008-12-04

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