EP4032615A1 - Broyeur agitateur - Google Patents

Broyeur agitateur Download PDF

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Publication number
EP4032615A1
EP4032615A1 EP21216174.9A EP21216174A EP4032615A1 EP 4032615 A1 EP4032615 A1 EP 4032615A1 EP 21216174 A EP21216174 A EP 21216174A EP 4032615 A1 EP4032615 A1 EP 4032615A1
Authority
EP
European Patent Office
Prior art keywords
process unit
rotor
agitator mill
product
drive shaft
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.)
Pending
Application number
EP21216174.9A
Other languages
German (de)
English (en)
Inventor
Frank Niemann
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.)
WILHELM NIEMANN & CO KG GmbH
Niemann Wilhelm Co KG GmbH
Original Assignee
WILHELM NIEMANN & CO KG GmbH
Niemann Wilhelm Co KG 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
Application filed by WILHELM NIEMANN & CO KG GmbH, Niemann Wilhelm Co KG GmbH filed Critical WILHELM NIEMANN & CO KG GmbH
Publication of EP4032615A1 publication Critical patent/EP4032615A1/fr
Pending 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
    • 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 with a container-shaped process unit, into which a drive shaft extends, and a rotor with a large number of tools in order to transfer energy to auxiliary grinding bodies.
  • Agitator mills are used to comminute and homogenize solid particles (paints and varnishes), in which auxiliary grinding media are intensively moved by means of an agitator shaft.
  • the solid particles are broken up by impact, pressure, shearing and friction.
  • agitator bead mills can be differentiated with regard to a horizontal or vertical alignment of the grinding chamber.
  • the grinding aids are activated by the agitator shaft, which can be equipped with agitators (tools) such as rods or discs.
  • the grinding chamber is usually filled to a high percentage, for example seventy to ninety percent, with grinding aids in the size range from 0.03 to 9 mm in diameter.
  • agitator mills comprise a grinding container in which an agitator shaft provided with grinding elements is arranged, whereby a grinding chamber is formed between the grinding container and the agitator shaft, into which the grinding elements extend and into which at least one inlet channel and one outlet channel for material to be ground opens and a separating device for auxiliary grinding bodies is provided.
  • the product to be ground flows continuously from a product inlet axially to the agitator shaft through the grinding chamber to a product outlet.
  • the grinding aids are then separated from the product flow by means of a separation system.
  • the throughput and the grinding bead size are limited in closed agitator bead mills by the separating device.
  • the auxiliary grinding media should be held back securely in the grinding container and must not lead to grinding media compression or clogging, even at high throughput rates.
  • the separating devices can be designed in a known manner as gap systems, centrifugal systems or as external separating systems.
  • EP 1943022 B1 is based on the task of designing an agitator mill of the generic type in such a way that, particularly when using grinding aids with an extremely small diameter, grinding and dispersing with a narrow particle distribution is achieved even with only one grinding material run through the agitator mill, without the risk of operational disruptions, in particular due to the impact of auxiliary grinding bodies on the protective screen.
  • the rotor tools attached to the rotor only leave a small gap to the container wall, that the inner space is designed as a grinding material discharge channel and that the tools attached to the rotor in one area as devices to prevent the overflow of auxiliary grinding bodies from the grinding space into the grinding material discharge channel between the auxiliary grinding body return channels and the deflection channel in the circumferential direction of the rotor are arranged overlapping one another on a helical line in such a way that when the rotor is rotated in one direction of rotation, they exert an impulse on the auxiliary grinding bodies that is opposite to the direction of flow.
  • An agitator mill is from the EP 0 370 022 B1 (according to U.S. 5,062,577 ) known.
  • the auxiliary grinding media are centrifuged out of the flow of grinding stock and auxiliary grinding media through the auxiliary grinding media return channels before they reach the protective screen.
  • the protective screen basically has the function of catching worn grinding media, which are too light to be spun off directly through the grinding media return channels, and to serve as a throttle point to build up a back pressure that counteracts the flow of the grinding material.
  • the agitator is provided with agitating tools protruding into the outer grinding chamber. When using extremely small auxiliary grinding media, there is no guarantee that the auxiliary grinding media will not reach the protective screen and clog it over time.
  • an agitator mill is known in which a pot-shaped rotor is arranged in a cylindrical housing and is provided with through-slots along its length.
  • An inner stator with a protective screen is arranged inside the rotor.
  • tools are attached both to the rotor and to the wall delimiting the grinding chamber.
  • This agitator mill is not suitable for the use of extremely fine grinding media. Otherwise, the problems already explained above also occur here.
  • an agitator mill which has a rotor which is equipped with paddle-shaped tools on its outside.
  • a protective screen is arranged inside the rotor.
  • the rotor consists of rods running parallel to the axis, to which the paddle-shaped tools are attached.
  • the material to be ground is fed in radially.
  • the paddle-like design of the agitator tools means that the auxiliary grinding bodies are concentrated in the region of the container wall; defined grinding, in particular by means of extremely small auxiliary grinding bodies, and reliable separation of the auxiliary grinding bodies without the risk of operational disruptions is also not possible with this.
  • the material to be ground flows radially through the packing of auxiliary grinding bodies, ie the material to be ground is placed in a grinding process only over a very short distance. If the material to be ground is only passed through the agitator mill once, only a small grinding progress is therefore achieved.
  • More mills are off DE102013 111 762 A1 , EP 2646160 B1 , EP 2907578 B1 , EP 3536405 A1 , EP 1992412 B1 , EP 1724022 B1 , EP 1724021 A1 , DE 19839210 B4 , U.S. 5,330,112 A known.
  • the object of the invention is to provide an alternative approach that enables the mill to be used in a broader range.
  • the invention comprises an agitator mill with a container-shaped process unit into which a drive shaft extends.
  • a rotor is preferably clamped to the drive shaft.
  • the drive shaft extends from below into the interior of the rotor.
  • the rotor is usually an elongated round body. This body can have projections, recesses and inner bores.
  • the body of the rotor has a corresponding axial bore.
  • the hole is preferably a blind hole or the end of the hole is closed by an element that allows a counter screw.
  • the bore or the shaft is cylindrical at its ends so that a clamping connection can be created.
  • a screw connection is made from above into the head of the shaft, which pulls the shaft into the bore and thus supports a press connection.
  • the rotor is provided with a plurality of activation pins on its exterior to transfer energy to grinding media.
  • the grinding aids are beads made of metal or ceramic.
  • the activation pins are preferably bolts, in particular made of metal, which are arranged radially on the outside of the rotor. The arrangement of the bolts can vary, so staggered, regular, threaded arrangements can be conceivable.
  • the product In order for the product to run or flow through the process unit, it has a product inlet and a product outlet, via which the product to be ground is guided into and out of the process unit.
  • the product to be ground is surrounded by a carrier liquid that is pumped through the processing unit.
  • a carrier liquid that is pumped through the processing unit.
  • the product inlet is arranged in the lower area of the processing unit and the product outlet in the upper area, so that the product flows upwards through the processing unit against gravity.
  • down is where the gravity of the earth is greater and up there, where the gravity of the earth is smaller, or where the path to the center of the earth is shorter, is down.
  • the invention also includes a motor, preferably a three-phase motor, which drives the drive shaft.
  • a motor preferably a three-phase motor, which drives the drive shaft.
  • the drive shaft extends from below through a bottom of the process unit into the vertically oriented process unit, and the motor is connected to the drive shaft below the process unit to transmit power to the drive shaft so that the lid can be removed when the process unit is full without having to remove the product or the grinding aids.
  • gravity has a supportive effect, as the beads are held back from the separation system. This makes it easier to replace wear parts or clogged parts.
  • Different screening stages can also be applied to the ground material. In this way, the sieve can gradually become smaller in the course of the grinding process.
  • the motor is arranged parallel, preferably laterally to the process unit, so that the axis of rotation of the motor is arranged parallel to the drive shaft.
  • drive belts and pulleys underneath the process unit can Power transmission take place.
  • Chains, gears or gears are also conceivable.
  • Other arrangements of the engine are also conceivable.
  • the cover can be removed upwards from the process unit by releasing locking means.
  • the cover is preferably fastened with screws or nuts on the edge or a flange of the outer shell of the process unit. Corresponding seals are provided in order to achieve sufficient tightness.
  • Interchangeable means that only bolts or screws need to be loosened without changing other structural parts inside or outside the process unit.
  • the cover or a flange arranged on the cover can be removed upwards in order to change a screen without the process unit having to be emptied or the rotor having to be changed, in particular not to remove the grinding aids or the product.
  • the cover can also be provided with a flange which only allows access to the sieve without removing the complete cover. This flange can be opened with appropriate quick-release fasteners and access to the screen can be granted. This allows the screen to be replaced, cleaned or exchanged for a finer screen.
  • the separating device is connected to the removable cover, so that removing the cover also removes the separating device.
  • the entire separating device can be removed upwards at once. It is therefore not necessary to work in the process unit, which makes clean work easier.
  • the product outlet is formed in the cover, which is arranged downstream of the separating device in the flow direction of the product.
  • the product output usually starts centrally from the lid and is guided upwards to the side. Other trainings are conceivable.
  • one possible embodiment also provides radially arranged activation pins on the stator, which is located on the inside of the processing unit Poke gaps between spaced rotor activation pins.
  • activation pins can be located on the rotor in the axial direction in the bottom area and/or on the top side pointing up and/or down.
  • the rotor has at its upper end a central recess which is directed towards the cover and is provided with a peripheral wall into which the separating device, which is fixed to the cover, extends from above.
  • the separator may be in the form of a tubular screen extending down from the lid into the process unit.
  • the rotor has a corresponding recess, so that the rotor rotates around the screen unit, which is arranged statically inside the rotor and is surrounded by the peripheral wall.
  • return openings are formed in the peripheral wall, which extend from the central recess in the direction of the stator in order to guide the auxiliary grinding bodies back into the space between the stator and the rotor.
  • the openings are used for easy return of the grinding aids, which are transported back by the centrifugal force generated by the rotor.
  • the return openings preferably do not run completely radially, but at an oblique angle or are bent in the direction of rotation, so that a pump vane effect is achieved, as in the case of a jet pump.
  • a clamping piece is arranged in the recess, which clamps the rotor to the drive shaft, the upper end of which extends into the recess.
  • the drive shaft thus ends just below the bottom of the recess and is fixed there by clamping with the rotor.
  • the product inlet is formed in the bottom area or in the lower lateral surface of the processing unit, so that the product to be ground flows through the agitator mill from bottom to top.
  • the dynamic separating device is driven by one or more carriers from the rotor.
  • the drivers extend upwards from the rotor and engage in a corresponding receptacle there, so that no separate drive is necessary.
  • the process unit has an outer shell that extends around the stator and forms a stator cooling space with a cooling water inlet and a cooling water outlet.
  • the cooling water flows from the bottom to the top like the product flow through the stator cooling space.
  • the bottom of the process unit has a bottom cooling space extending around the drive shaft with a cooling water inlet and a cooling water outlet.
  • the rotor could also be designed as a cooled variant, in that the cooling medium is fed into the rotor from below through the drive shaft.
  • the figure 1 shows the inventive mill from the side, with the housing being partially translucent.
  • a process unit 2 and a motor 3 are arranged parallel to one another on a machine stand 1, so that their axes of rotation are parallel to one another.
  • the motor shaft is directed downwards and is fitted with a motor V-belt pulley 4.
  • the process unit 2 also has a V-belt pulley 6 formed on the underside. Both V-belt pulleys are connected to one another via a V-belt 5.
  • a bearing 7 is formed in the shape of a table on the side of the motor housing.
  • the processing unit 2 is arranged on this bearing and a drive shaft 33 extends through the bearing, which is connected to the V-belt pulley 6 on one side and to a rotor 17 arranged in the processing unit 2 on the other side.
  • the motor thus drives the rotor in the process unit.
  • a product inlet 8 is arranged above the bearing 7 , which enables a product to flow into the bottom area of the processing unit 2 .
  • the product to be ground is pumped against the force of gravity from the bottom up to the cover of the processing unit 2.
  • the product to be ground is in a carrier liquid and is pumped with this through the process unit.
  • the product outlet 9, from which the product to be ground exits, is located in the area of the cover.
  • the first stator cooling space 19 is formed in the wall area of the process unit 2 .
  • a cooling water access 10 for a stator 16 is provided for this purpose.
  • the process unit 2 is preferably double-walled with an outer shell 14 and an inner shell, which serves as a stator 16 .
  • the stator cooling chamber 19 is flooded with cooling liquid from bottom to top and is also pumped through in this direction.
  • a corresponding cooling water outlet 11 is located in the upper area of the process unit.
  • a floor cooling chamber 20 is formed in the floor in order to cool the bearing of the drive shaft 33 and the material to be ground in the floor area.
  • a cooling water inlet 12 is formed in the base 12 and a cooling water outlet 13 is formed in the base.
  • the barrel-shaped process unit 2 comprises the outer casing 14, within which the stator 16 is formed at a distance.
  • the stator cooling chamber 19 is arranged between the two.
  • a grinding chamber 18 is formed around the stator 16, directed inwards, in the center of which the rotor 17 rotates.
  • the process unit is closed off at the bottom by a process unit floor 21 to which the floor cooling space 20 borders.
  • the outer shell 14 is usually connected to the process unit base 21 .
  • a bead drain plug 32 is provided in the process unit bottom to drain the grinding auxiliary bodies 31 downward.
  • the bearing housing serves as a support for the process unit floor.
  • a flange connection 22 of the process unit on the bearing housing is used for this purpose.
  • the process unit is attached to the flange connection 23 by an attachment 23 .
  • the process unit is delimited by an upper grinding chamber cover 15 with a receptacle for a sieve unit/static separating device.
  • the figures 2 and 3 show a grinding chamber cover with sieve installed and removed upwards.
  • FIG 4 shows a dynamic separator.
  • the grinding chamber cover has a bore in which the sieve unit 26 is arranged.
  • the screen unit in turn has a screen cover 27 and a screen 28 adjoining it.
  • Releasable fasteners 29 and 24 allow both the grinding chamber cover and the sieve unit to be removed, replaced or cleaned.
  • activation pins 30 formed at right angles to the axis of rotation, which extend into the space between the stator and rotor in order to engage in one another and in this way to transfer the rotational energy to the auxiliary grinding bodies 31 .
  • the activation pins can even be on the bottom or top of the rotor and face up or down like the Figures 2-4 demonstrate.
  • the rotor shows how figure 3 can be seen well, in the upper area on a central recess 41 into which the screen extends when the device is in operation. Through this the screen surface is increased with a compact design at the same time.
  • the rotor has return openings 25 in its upper region so that auxiliary grinding bodies that are in direct contact with the sieve can be returned to the grinding chamber. These are arranged circumferentially spaced and extend from the upper edge of the recess 41 to its lower edge.
  • the drive shaft 33 extends almost to the bottom of the central recess 41 through a rotor hub 34.
  • the drive shaft 33 is connected to the rotor hub 34 by a sprag 35 formed at the bottom of the central recess 41.
  • the rotor casing (item 31) then extends around the rotor hub and can be connected to the rotor hub in one piece or detachably.
  • the figure 4 shows an embodiment of the invention in which the upper grinding chamber cover 36 is designed with a dynamic separating device 40 with a friction gap 37 .
  • the invention can be retrofitted in a short time without emptying the process unit. All you have to do is replace the cover.
  • Flights 38 transfer the rotary motion from the rotor to the dynamic gap or separator, which has two rings placed closely together, with one of the rings rotating. The ground product is guided through this gap.
  • the outlet 39 and the bearing housing of the dynamic separating device are formed in the grinding chamber cover.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
EP21216174.9A 2021-01-25 2021-12-20 Broyeur agitateur Pending EP4032615A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102021101527.8A DE102021101527B4 (de) 2021-01-25 2021-01-25 Rührwerksmühle

Publications (1)

Publication Number Publication Date
EP4032615A1 true EP4032615A1 (fr) 2022-07-27

Family

ID=79021535

Family Applications (1)

Application Number Title Priority Date Filing Date
EP21216174.9A Pending EP4032615A1 (fr) 2021-01-25 2021-12-20 Broyeur agitateur

Country Status (2)

Country Link
EP (1) EP4032615A1 (fr)
DE (1) DE102021101527B4 (fr)

Citations (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3437866A1 (de) 1984-10-16 1986-04-17 Basf Farben + Fasern Ag, 2000 Hamburg Dispergierverfahren und ruehrwerksmuehle zu seiner durchfuehrung
US5062577A (en) 1987-05-18 1991-11-05 Draiswerke Gmbh Agitator mill
EP0546320A2 (fr) 1991-12-13 1993-06-16 Inoue Mfg., Inc. Appareil de dispersion et de broyage
US5330112A (en) 1992-05-27 1994-07-19 Mitsui Mining Company, Limited Crushing apparatus
EP0504836B1 (fr) 1991-03-21 1995-06-14 Erich Netzsch GmbH & Co. Holding KG Broyeur agitateur
DE19638354A1 (de) 1996-09-19 1998-03-26 Draiswerke Inc Mahwah Rührwerksmühle
EP1724021A1 (fr) 2005-05-19 2006-11-22 Bühler AG Broyeur à agitateur
EP1724022B1 (fr) 2005-05-19 2007-05-02 Bühler AG Broyeur à agitateur
DE19839210B4 (de) 1998-08-28 2007-09-06 BüHLER GMBH Rührwerksmühle
EP1992412B1 (fr) 2005-10-11 2010-02-03 Bühler Ag Moulin mélangeur agitateur
DE102011010527A1 (de) * 2011-02-07 2012-08-09 Lipp Mischtechnik Gmbh Rührwerkskugelmühle
DE102013111762A1 (de) 2013-07-08 2015-01-08 Netzsch-Feinmahltechnik Gmbh Rührwerkskugelmühle mit Axialkanälen
EP2646160B1 (fr) 2010-12-04 2016-02-03 NETZSCH-Feinmahltechnik GmbH Élément dynamique pour le dispositif de séparation d'un broyeur agitateur à billes
EP2907578B1 (fr) 2014-02-12 2016-07-06 NETZSCH-Feinmahltechnik GmbH Récipient de broyage pour broyeur doté d'au moins un bouchon
EP3536405A1 (fr) 2018-03-07 2019-09-11 Bühler AG Moulin à agitateur pourvu de dispositif de tige asynchrone

Patent Citations (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5011089A (en) 1984-10-16 1991-04-30 Basf Lacke+Farben Ag Dispersing process and stirred ball mill for carrying out this process
DE3437866A1 (de) 1984-10-16 1986-04-17 Basf Farben + Fasern Ag, 2000 Hamburg Dispergierverfahren und ruehrwerksmuehle zu seiner durchfuehrung
US5062577A (en) 1987-05-18 1991-11-05 Draiswerke Gmbh Agitator mill
EP0370022B1 (fr) 1987-05-18 1992-12-09 Draiswerke GmbH Melangeur-broyeur
EP0504836B1 (fr) 1991-03-21 1995-06-14 Erich Netzsch GmbH & Co. Holding KG Broyeur agitateur
EP0546320A2 (fr) 1991-12-13 1993-06-16 Inoue Mfg., Inc. Appareil de dispersion et de broyage
US5346145A (en) 1991-12-13 1994-09-13 Inoue Mfg., Inc. Dispersing and grinding apparatus
US5330112A (en) 1992-05-27 1994-07-19 Mitsui Mining Company, Limited Crushing apparatus
DE19638354A1 (de) 1996-09-19 1998-03-26 Draiswerke Inc Mahwah Rührwerksmühle
US5894998A (en) 1996-09-19 1999-04-20 Draiswerke, Inc. Agitator mill
DE19839210B4 (de) 1998-08-28 2007-09-06 BüHLER GMBH Rührwerksmühle
EP1724021A1 (fr) 2005-05-19 2006-11-22 Bühler AG Broyeur à agitateur
EP1724022B1 (fr) 2005-05-19 2007-05-02 Bühler AG Broyeur à agitateur
EP1992412B1 (fr) 2005-10-11 2010-02-03 Bühler Ag Moulin mélangeur agitateur
EP1943022B1 (fr) 2005-10-11 2010-03-31 Bühler AG Broyeur melangeur
EP2646160B1 (fr) 2010-12-04 2016-02-03 NETZSCH-Feinmahltechnik GmbH Élément dynamique pour le dispositif de séparation d'un broyeur agitateur à billes
DE102011010527A1 (de) * 2011-02-07 2012-08-09 Lipp Mischtechnik Gmbh Rührwerkskugelmühle
DE102013111762A1 (de) 2013-07-08 2015-01-08 Netzsch-Feinmahltechnik Gmbh Rührwerkskugelmühle mit Axialkanälen
EP2907578B1 (fr) 2014-02-12 2016-07-06 NETZSCH-Feinmahltechnik GmbH Récipient de broyage pour broyeur doté d'au moins un bouchon
EP3536405A1 (fr) 2018-03-07 2019-09-11 Bühler AG Moulin à agitateur pourvu de dispositif de tige asynchrone

Also Published As

Publication number Publication date
DE102021101527B4 (de) 2023-05-17
DE102021101527A1 (de) 2022-07-28

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