EP3946741B1 - Agitator ball mill - Google Patents
Agitator ball mill Download PDFInfo
- Publication number
- EP3946741B1 EP3946741B1 EP21715572.0A EP21715572A EP3946741B1 EP 3946741 B1 EP3946741 B1 EP 3946741B1 EP 21715572 A EP21715572 A EP 21715572A EP 3946741 B1 EP3946741 B1 EP 3946741B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- stator
- rotor
- tools
- milling tools
- length
- 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.)
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- 238000003801 milling Methods 0.000 claims description 40
- 239000000463 material Substances 0.000 claims description 6
- 230000009969 flowable effect Effects 0.000 claims 1
- 238000000227 grinding Methods 0.000 description 97
- 230000035508 accumulation Effects 0.000 description 4
- 238000009825 accumulation Methods 0.000 description 4
- 239000011324 bead Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000005243 fluidization Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000004026 adhesive bonding Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Images
Classifications
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- 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
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- 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
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- 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
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- 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
- B02C17/20—Disintegrating members
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- 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
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- 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
- B02C17/183—Feeding or discharging devices
- B02C17/1835—Discharging devices combined with sorting or separating of material
- B02C17/184—Discharging devices combined with sorting or separating of material with separator arranged in discharge path of crushing zone
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- 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
- B02C2017/165—Mills in which a fixed container houses stirring means tumbling the charge with stirring means comprising more than one agitator
Definitions
- the present disclosure relates to an agitator ball mill and in particular to an agitator ball mill in which improved fluidization and distribution of the grinding aids within the agitator ball mill is ensured.
- RWKM agitator bead mill
- Agitator bead mills for example, are also from the documents DE 4 008 472 A1 , DE 19 638 354 A1 and WO 2006/116338 A2 known.
- an agitator ball mill which has a rotor with agitator tools which protrude into a grinding chamber.
- the agitator ball mill also has counter-bars attached to sliding bars.
- the counter-rods each have the same length.
- the shifting bars can be adjusted at the top and/or bottom, so that the counter-bars attached to the shifting bars can be pushed into the grinding chamber and pulled out of the grinding chamber.
- the DE 196 38 354 A1 describes an agitator ball mill with a cylindrical outer stator and a rotor arranged in the outer stator, which form a grinding chamber. Grinding bodies are arranged in the grinding chamber. The grinding chamber tapers in steps towards an inlet opening. Agitator bolts are attached to the outer stator and to the rotor, with the agitator bolts arranged in the area of the tapering grinding chamber being shortened.
- the present disclosure includes an agitator mill for treating free-flowing material to be ground, with a circular-cylindrical external stator and an agitator, which is mounted rotatably about a common central axis, with a circular-cylindrical rotor.
- the rotor is arranged inside the outer stator and a grinding chamber is formed between the rotor and the outer stator.
- the grinding chamber has a constant width between the outer stator and the rotor.
- a feed channel is located in front of the grinding chamber, through which the material to be ground can be fed into the grinding chamber.
- a discharge channel is provided through which the material to be ground can leave the grinding chamber.
- a through-flow direction through the grinding chamber is thus defined by the feed and discharge channel, which direction extends from the feed channel to the discharge channel.
- the grinding chamber is at least partially filled with auxiliary grinding bodies. Furthermore, rotor grinding tools are attached to the rotor and extend radially in the direction of the outer stator. Furthermore, external stator milling tools are attached to the external stator, which protrude radially with a length into the milling chamber.
- the external stator grinding tools are arranged in a circumferentially spaced apart manner and form rows. These rows are arranged parallel to each other on the outer stator along the central axis.
- the external stator grinding tools are also arranged in longitudinal rows, ie perpendicular to the circumferential direction and along the central axis.
- the external stator grinding tools thus form longitudinal rows in the direction of the central axis, ie along the direction of flow, and also rows perpendicular thereto, ie in a circle around the circumference of the external stator.
- the external grinding tools of at least one row, preferably three rows, of external stator grinding tools on the side of the grinding chamber facing away from the feed channel have a greater radial length than the remaining external stator grinding tools.
- the external stator grinding tools at least in the rearmost row(s) in the circumferential direction in the flow direction, i.e. all external stator grinding tools that lie on circles around the circumference of the external stator that are furthest away from the feed channel, have a greater radial length than the other external stator grinding tools.
- the outer stator preferably has six to twelve rows of outer stator milling tools in the circumferential direction and/or eight to twenty longitudinal rows of outer stator milling tools.
- the lower row or rows are the rows with external stator grinding tools greater length.
- the outer stator milling tools of each row in the circumferential direction can each have the same length.
- the length of the outer stator grinding tools with a greater length can be longer by a factor of 1.5 to 2.5, preferably 1.75 to 2.25 and particularly preferably 2.0 than the length of the other outer stator grinding tools.
- the length of the remaining external stator grinding tools can be between 5 and 20 mm, preferably between 7 and 15 mm.
- the rotor milling tools each preferably have the same length, for example 20 mm to 40 mm.
- the external stator grinding tools and/or the rotor grinding tools are preferably designed in the form of pins.
- the pins preferably have a cylindrical shape, with the length being at least as great as the diameter of the pins.
- a separator may be provided within the rotor.
- the discharge channel for discharging the free-flowing material to be ground can be arranged behind the separating device.
- the invention is based on the figure 1 described. It shows a cross section through an agitator ball mill according to an example of the invention.
- FIG. 1 The following is referred to a vertical agitator bead mill (RWKM).
- FIG 1 Reference is made, ie to a RWKM according to a preferred embodiment, which is arranged during operation in such a way that a central axis 5 is oriented vertically and the direction of flow runs from top to bottom.
- the direction parallel to the central axis 5 is called the axial direction.
- the invention can also be used in horizontal or inclined RWKM.
- RWKM shown has an agitator with a substantially cylindrical rotor 1, the rotor 1 having an outer diameter D1 and an inner diameter d1.
- the rotor 1 is rotatably mounted about the center axis 5 . According to the embodiment shown, this is aligned vertically.
- the RWKM has an outer stator 2 with an outer stator inner diameter D2, which surrounds the rotor 1.
- the inner wall of the outer stator 2 facing the rotor 1 is circular-cylindrical.
- the rotor 1 and the outer stator 2 are coaxial with the central axis 5.
- the rotor 1 also has a circular-cylindrical outer wall.
- a grinding chamber 4 is formed between the outer stator 2 and the rotor 1, which has the same radial thickness over the entire height and in the circumferential direction.
- the grinding chamber 4 thus has a constant ring gauge.
- the ground material to be treated is introduced into the grinding chamber 4 via a feed channel 7 .
- the RWKM has an inner stator 22 with inner stator outer diameter d22, which forms a discharge space 23 with the radially inner side of the rotor 1.
- the discharge space 23 is via a channel in the figure 1 is formed below the rotor 1, connected to the grinding chamber 4.
- the dispersed product thus flows from the grinding chamber 4 via the channel into the discharge chamber 23 to a separating device 3, which is arranged above the inner stator 22.
- the separating device 3 is set up to hold back grinding aids that may have been entrained.
- a discharge channel 6 is located centrally within the separating device 3 and discharges the finished product from the machine.
- Rotor grinding tools 11 are attached to the outer wall of the rotor 1 and protrude into the grinding chamber 4 in the radial direction.
- External stator grinding tools 21, 211 are attached to the inner wall of the external stator 2 and protrude into the grinding chamber 4 in the radial direction.
- the tools 11, 21, 211 are offset in such a way that when the rotor 1 rotates, there is a sufficient distance between them.
- the tools 11, 21, 211 are preferably attached in longitudinal rows parallel to the central axis, ie vertically in the embodiment shown, and in the circumferential direction on the circular-cylindrical outer wall of the rotor 1 or the circular-cylindrical inner wall of the outer stator 2.
- the tools 11, 21, 211 are preferably equally spaced apart from one another in the longitudinal and/or circumferential direction. In other words, the tools 11, 21, 211 are evenly distributed.
- Each longitudinal row of tools 11, 21, 211 preferably has six to twenty tools 11, 21, 211 per row.
- six to twelve tools 11, 21, 211 are preferably attached in the circumferential direction per row of tools 11, 21, 211.
- the invention is not linked to the number of tools 11, 21, 211 in the longitudinal and/or circumferential direction and can be applied to any RWKM with stator and rotor tools.
- the length below designates the radial length of the tools 11, 21, 211, ie the length that the tools 11, 21, 211 extend radially into the grinding chamber 4, ie in the direction of the outer stator 2 or in the direction of the rotor 1 protrude.
- the rotor tools 11 have the same length.
- the rotor tools 11 generally have a length of about 20 mm to 40 mm.
- the external stator grinding tools 211 point in the rear region of the external stator 2 in the direction of flow, i.e. the lower region in the embodiment shown (cf. figure 1 ) a greater length.
- the rear area faces the channel connecting grinding chamber 4 and discharge chamber 23 .
- the rows of external stator grinding tools 21, 211 each have the same length in the circumferential direction. At least the one in the figure 1
- the lowest (in the direction of flow rear) row of external stator grinding tools 211 preferably the lowest two rows and particularly preferably the lowest three rows, have a greater length than the remaining external stator grinding tools 21. If viewed in the vertical direction, more than one row of external stator grinding tools 211 have a greater length , these outer stator milling tools 211 preferably have the same length.
- a gradual increase in the length of the external stator grinding tools 21, 211 in the direction of flow can also be expedient.
- the length of the outer stator grinding tools 211 with greater length can be longer by a factor of 1.5 to 2.5, preferably 1.75 to 2.25 and particularly preferably by a factor of 2.0 than the length of the other outer stator grinding tools 21.
- the length of the remaining external stator grinding tools 21 can be between 5 and 20 mm, preferably between 7 and 15 mm.
- the ratio of the rotor outer diameter D1 to the outer stator inner diameter D2, which diameters are respectively measured without considering the grinding tools 11, 21, 211, is defined as follows 0.6 ⁇ D 1 / D 2 ⁇ 0.95 .
- the ratio of the inner stator outer diameter is d22, where d22 is ignoring the in 1 pins shown is defined to rotor inner diameter d1 as follows 0.8 ⁇ i.e 22 / i.e 1 ⁇ 0.95 .
- the ratio of the number of External stator milling tools 211 with greater length to the number of the remaining external stator milling tools 21 between 0.1 and 0.5.
- the outer stator 2 has two outer stator milling tools 211 with a greater length and eight remaining outer stator milling tools 21 .
- the ratio of the height at which external stator grinding tools 211 protrude with greater length into the grinding chamber 4 to the overall height of the grinding chamber 4 (length of the outer stator 2) is between 0.05 and 0.3, preferably between 0.1 and 0.2.
- the height at which the longer outer stator grinding tools 211 protrude into the grinding chamber 4 is to be understood as the extension of the length of the longer outer stator grinding tools 211 in the axial direction, i.e. the area of the grinding chamber 4 in which the length in which the outer stator grinding tools 211 are arranged with greater length in the grinding chamber. In other words, in the case of a vertical agitator mill, this corresponds to the height of the process zone (grinding chamber 4), which is covered by the longer external stator grinding tools 211.
- the ratio of the length by which external stator grinding tools 211 project into the grinding chamber 4 with greater length to the external stator inner diameter D2 is preferably between 0.05 and 0.4, particularly preferably between 0.2 and 0.3. With an extension of the external stator grinding tools 211 with a greater length in the grinding chamber 4 of 150 mm and an external stator inner diameter D2 of 550 mm, a ratio of 0.27 results.
- auxiliary grinding bodies can occur in the rear area in the direction of flow due to the drag forces, and in particular in vertical RWKM also due to gravity, during the grinding or dispersing process. Even with horizontal or inclined RWKM, auxiliary grinding bodies can become displaced due to the drag forces accumulate in a part of the grinding chamber, especially in the flow direction downwards.
- the extended external stator grinding tools in the rear area in the flow direction result in improved fluidization of the auxiliary grinding bodies in the entire RWKM. Accumulation of grinding aids in a part of the machine can be effectively prevented. If there is an accumulation of grinding media during operation, this can be loosened up noticeably and set in motion by using longer pins in the lower area of the outer stator.
- the arrangement enables a lower power consumption in the case of low-viscosity products with low viscosities (thickness) and/or less tackiness.
- vibrations occurring in the machine due to accumulations of grinding aids can be reduced.
- the milling tools of the present disclosure are glued in place. This prevents procedural manipulation of the mill during operation.
- the tools are sealed to the stator by gluing, which avoids a reduction in the cooling surface.
- the tools of the outer stator are preferably provided in two different, defined lengths. Thus there is only one step of the tool length in the axial direction. This also ensures constant grinding conditions over the entire grinding time.
- the invention can also be used in an existing RWKM, in particular in a RWKM whose external stator grinding tools are designed to be exchangeable.
- the external stator grinding tools of the rows in the circumferential direction that are remote from the feed channel are replaced by external stator grinding tools that have a correspondingly greater length.
- the external stator grinding tools of a desired number of rows are replaced, ie at least the tools of the rearmost row in the direction of flow, preferably those of the three rearmost rows.
- the invention also includes individual features in the figures, even if they are shown there in connection with other features and/or are not mentioned above.
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- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Crushing And Grinding (AREA)
Description
Die vorliegende Offenbarung bezieht sich auf eine Rührwerkskugelmühle und insbesondere eine Rührwerkskugelmühle, bei der eine verbesserte Fluidisierung und Verteilung der Mahlhilfskörper innerhalb der Rührwerkskugelmühle gewährleistet wird.The present disclosure relates to an agitator ball mill and in particular to an agitator ball mill in which improved fluidization and distribution of the grinding aids within the agitator ball mill is ensured.
Der prinzipielle Aufbau einer Rührwerkskugelmühle (RWKM) ist beispielsweise aus der
Rührwerkskugelmühlen sind beispielsweise auch aus den Dokumenten
Aus der
Die
Somit ist es die Aufgabe der vorliegenden Offenbarung, eine tiefere Leistungsaufnahme bei dünnflüssigen Produkten mit niedrigen Viskositäten und/oder geringerer Zügigkeit, insbesondere durch eine bessere Verteilung der Mahlhilfskörper innerhalb der RWKM, zu erreichen. Die Erfindung wird durch die Merkmale des unabhängigen Anspruchs 1 definiert. Die abhängigen Ansprüche beschreiben bevorzugte Ausführungsformen.It is therefore the object of the present disclosure to achieve lower power consumption in the case of low-viscosity products with low viscosities and/or less tack, in particular through better distribution of the grinding aids within the RWKM. The invention is defined by the features of
Die vorliegende Offenbarung umfasst eine Rührwerksmühle zum Behandeln von fließfähigem Mahlgut mit einem kreiszylindrischen Außenstator und einem um eine gemeinsame Mittelachse drehbar gelagerten Rührwerk mit einem kreiszylindrischen Rotor. Der Rotor ist innerhalb des Außenstators angeordnet und zwischen Rotor und Außenstator ist ein Mahlraum ausgebildet. Der Mahlraum weist zwischen Außenstator und Rotor eine konstante Breite auf. Dem Mahlraum ist ein Zuführkanal vorgelagert, durch den das Mahlgut in den Mahlraum geführt werden kann. Ferner ist ein Abführkanal vorgesehen, durch den das Mahlgut den Mahlraum verlassen kann. Durch Zuführ- und Abführkanal wird somit eine Durchströmrichtung durch den Mahlraum definiert, die sich von dem Zuführkanal zu dem Ablaufkanal erstreckt.The present disclosure includes an agitator mill for treating free-flowing material to be ground, with a circular-cylindrical external stator and an agitator, which is mounted rotatably about a common central axis, with a circular-cylindrical rotor. The rotor is arranged inside the outer stator and a grinding chamber is formed between the rotor and the outer stator. The grinding chamber has a constant width between the outer stator and the rotor. A feed channel is located in front of the grinding chamber, through which the material to be ground can be fed into the grinding chamber. Furthermore, a discharge channel is provided through which the material to be ground can leave the grinding chamber. A through-flow direction through the grinding chamber is thus defined by the feed and discharge channel, which direction extends from the feed channel to the discharge channel.
Der Mahlraum ist zumindest teilweise mit Mahlhilfskörpern gefüllt. Ferner sind am Rotor Rotormahlwerkzeuge angebracht, die sich radial in Richtung des Außenstators erstrecken. Weiterhin sind am Außenstator Außenstatormahlwerkzeuge angebracht, die radial mit einer Länge in den Mahlraum hineinragen. Die Außenstatormahlwerkzeuge sind die in Umfangsrichtung nebeneinander beabstandet angeordnet und bilden Reihen. Diese Reihen sind parallel zueinander am Außenstator entlang die Mittelachse angeordnet. Die Außenstatormahlwerkzeuge sind zudem in Längsreihen, also senkrecht zur Umfangsrichtung und längs der Mittelachse, angeordnet.The grinding chamber is at least partially filled with auxiliary grinding bodies. Furthermore, rotor grinding tools are attached to the rotor and extend radially in the direction of the outer stator. Furthermore, external stator milling tools are attached to the external stator, which protrude radially with a length into the milling chamber. The external stator grinding tools are arranged in a circumferentially spaced apart manner and form rows. These rows are arranged parallel to each other on the outer stator along the central axis. The external stator grinding tools are also arranged in longitudinal rows, ie perpendicular to the circumferential direction and along the central axis.
Die Außenstatormahlwerkzeuge bilden also zum einen Längsreihen in Richtung der Mittelachse, also entlang der Durchströmrichtung, und weiterhin Reihen senkrecht dazu, also kreisförmig um den Umfang des Außenstators.The external stator grinding tools thus form longitudinal rows in the direction of the central axis, ie along the direction of flow, and also rows perpendicular thereto, ie in a circle around the circumference of the external stator.
Die Außenmahlwerkzeuge wenigstens einer Reihe, bevorzugt von drei Reihen von Außenstatormahlwerkzeuge an der dem Zuführkanal abgewandten Seite des Mahlraums weisen eine größere radiale Länge auf als die übrigen Außenstatormahlwerkzeuge. Anders ausgedrückt weisen also die Außenstatormahlwerkzeuge zumindest der in Durchströmrichtung hintersten Reihe(n) in Umfangsrichtung, also sämtliche Außenstatormahlwerkzeuge, die auf Kreisen um den Umfang des Außenstators liegen, die vom Zuführkanal am meisten entfernt liegen, eine größere radiale Länge auf als die übrigen Außenstatormahlwerkzeuge.The external grinding tools of at least one row, preferably three rows, of external stator grinding tools on the side of the grinding chamber facing away from the feed channel have a greater radial length than the remaining external stator grinding tools. In other words, the external stator grinding tools, at least in the rearmost row(s) in the circumferential direction in the flow direction, i.e. all external stator grinding tools that lie on circles around the circumference of the external stator that are furthest away from the feed channel, have a greater radial length than the other external stator grinding tools.
Bevorzugt weist der Außenstator sechs bis zwölf Reihen von Außenstatormahlwerkzeugen in Umfangsrichtung und/oder acht bis zwanzig Längsreihen von Außenstatormahlwerkzeugen auf.The outer stator preferably has six to twelve rows of outer stator milling tools in the circumferential direction and/or eight to twenty longitudinal rows of outer stator milling tools.
In einer Ausführungsform, in der die Rührwerksmühle im Betrieb derart angeordnet ist, dass die Mittelachse vertikal ausgerichtet ist und die Durchströmrichtung im Mahlraum von oben nach unten verläuft, ist die untere Reihe bzw. sind die unteren, vorzugsweise drei Reihen in Umfangsrichtung die Reihen mit Außenstatormahlwerkzeugen größerer Länge.In one embodiment, in which the agitator mill is arranged during operation in such a way that the central axis is aligned vertically and the direction of flow in the grinding chamber runs from top to bottom, the lower row or rows, preferably three rows in the circumferential direction, are the rows with external stator grinding tools greater length.
Die Außenstatormahlwerkzeuge jeder Reihe in Umfangsrichtung können jeweils die gleiche Länge aufweisen. Die Länge der Außenstatormahlwerkzeuge mit größerer Länge kann um den Faktor 1,5 bis 2,5, bevorzugt 1,75 bis 2,25 und besonders bevorzugt 2,0 länger sein als die Länge der übrigen Außenstatormahlwerkzeuge. Die Länge der übrigen Außenstatormahlwerkzeuge kann zwischen 5 und 20 mm, bevorzugt zwischen 7 und 15 mm betragen.The outer stator milling tools of each row in the circumferential direction can each have the same length. The length of the outer stator grinding tools with a greater length can be longer by a factor of 1.5 to 2.5, preferably 1.75 to 2.25 and particularly preferably 2.0 than the length of the other outer stator grinding tools. The length of the remaining external stator grinding tools can be between 5 and 20 mm, preferably between 7 and 15 mm.
Die Rotormahlwerkzeuge weisen jeweils bevorzugt die gleiche Länge auf, beispielsweise 20 mm bis 40 mm.The rotor milling tools each preferably have the same length, for example 20 mm to 40 mm.
Die Außenstatormahlwerkzeuge und/oder die Rotormahlwerkzeuge sind bevorzugt in Form von Stiften ausgeführt. Die Stifte weisen bevorzugt eine Zylinderform auf, wobei die Länge mindestens so groß wie der Durchmesser der Stifte ist.The external stator grinding tools and/or the rotor grinding tools are preferably designed in the form of pins. The pins preferably have a cylindrical shape, with the length being at least as great as the diameter of the pins.
Innerhalb des Rotors kann eine Trenneinrichtung vorgesehen sein. In Durchströmrichtung kann der Ablaufkanal zum Abführen des fließfähigen Mahlguts hinter der Trenneinrichtung angeordnet sein.A separator may be provided within the rotor. In the direction of flow, the discharge channel for discharging the free-flowing material to be ground can be arranged behind the separating device.
Die Erfindung wird anhand der
Im Folgenden wird auf eine vertikale Rührwerkskugelmühle (RWKM) gemäß
Die in
Ebenfalls koaxial zur Mittelachse 5 weist die RWKM einen Innenstator 22 mit Innenstatoraußendurchmesser d22 auf, der mit der radial innenliegenden Seite des Rotors 1 einen Abführraum 23 bildet. Der Abführraum 23 ist über einen Kanal, der in der
An der Außenwand des Rotors 1 sind Rotormahlwerkzeuge 11 angebracht, die in radialer Richtung in den Mahlraum 4 hineinragen. An der Innenwand des Außenstators 2 sind Außenstatormahlwerkzeuge 21, 211 angebracht, die in radialer Richtung in den Mahlraum 4 hineinragen. Die Werkzeuge 11, 21, 211 sind derart versetzt angebracht, dass bei Rotation des Rotors 1 ein ausreichender Abstand zwischen ihnen ausgebildet ist.
Bevorzugt sind die Werkzeuge 11, 21, 211 in Längsreihen parallel zur Mittelachse, in der gezeigten Ausführungsform also vertikal, sowie in Umfangsrichtung an der kreiszylindrischen Außenwand des Rotors 1 bzw. der kreiszylindrischen Innenwand des Außenstators 2 angebracht. Bevorzugt sind die Werkzeuge 11, 21, 211 jeweils in Längs- und/oder in Umfangsrichtung gleich voneinander beabstandet. Mit anderen Worten sind die Werkzeuge 11, 21, 211 gleichmäßig verteilt. Bevorzugt weist jede Längsreihe der Werkzeuge 11, 21, 211 sechs bis zwanzig Werkzeuge 11, 21, 211 pro Reihe auf. Ferner sind bevorzugt in Umfangsrichtung pro Reihe Werkzeuge 11, 21, 211 sechs bis zwölf Werkzeuge 11, 21, 211 angebracht. Die Erfindung ist jedoch nicht an die Anzahl der Werkzeuge 11, 21, 211 in Längs- und/oder Umfangsrichtung gekoppelt und kann auf jede RWKM mit Stator- und Rotorwerkzeugen angewendet werden.The
Die Länge bezeichnet im Folgenden, falls nicht anderweitig definiert, die radiale Länge der Werkzeuge 11, 21, 211, d.h. die Länge, die die Werkzeuge 11, 21, 211 in den Mahlraum 4 radial, also in Richtung des Außenstators 2 bzw. in Richtung des Rotors 1 hineinragen. Die Rotorwerkzeuge 11 weisen die gleiche Länge auf. Die Rotorwerkzeuge 11 haben im Allgemeinen eine Länge von etwa 20 mm bis 40 mm. Erfindungsgemäß weisen die Außenstatormahlwerkzeuge 211 im in Durchströmrichtung hinteren, also in der gezeigten Ausführungsform unteren Bereich des Außenstators 2 (vgl.
Der hintere Bereich ist dem Kanal, der Mahlraum 4 und Abführraum 23 verbindet, zugewandt. Dabei weisen die Reihen der Außenstatormahlwerkzeuge 21, 211 in Umfangsrichtung jeweils die gleiche Länge auf. Mindestens die in der
Die Länge der Außenstatormahlwerkzeuge 211 mit größerer Länge kann um den Faktor 1,5 bis 2,5, bevorzugt 1,75 bis 2,25 und besonders bevorzugt um den Faktor 2,0 länger sein als die Länge der übrigen Außenstatormahlwerkzeuge 21. Die Länge der übrigen Außenstatormahlwerkzeuge 21 kann zwischen 5 und 20 mm, bevorzugt zwischen 7 und 15 mm betragen.The length of the outer
Gemäß der vorliegenden beispielhaften Ausführungsform ist das Verhältnis des Rotoraußendurchmessers D1 zum Außenstatorinnendurchmesser D2, wobei die Durchmesser jeweils ohne Berücksichtigung der Mahlwerkzeuge 11, 21, 211 gemessen werden, wie folgt definiert
Ferner ist gemäß dem Beispiel das Verhältnis des Innenstatoraußendurchmesser d22, wobei d22 ohne Berücksichtigung der in
Des Weiteren ist gemäß einem Beispiel das Verhältnis der Anzahl der Außenstatormahlwerkzeuge 211 mit größerer Länge zu der Anzahl der übrigen Außenstatormahlwerkzeuge 21 zwischen 0,1 und 0,5. Beispielsweise weist der Außenstator 2 zwei Außenstatormahlwerkzeuge 211 mit größerer Länge und acht übrige Außenstatormahlwerkzeuge 21 auf.Furthermore, according to an example, the ratio of the number of External
Beispielhaft beträgt das Verhältnis der Höhe, in der Außenstatormahlwerkzeuge 211 mit größerer Länge in den Mahlraum 4 hineinragen, zur Gesamthöhe des Mahlraums 4 (Länge des Außenstators 2) zwischen 0.05 und 0,3, bevorzugt zwischen 0,1 und 0,2.For example, the ratio of the height at which external
Die Höhe, in der Außenstatormahlwerkzeuge 211 mit größerer Länge in den Mahlraum 4 hineinragen, ist dabei als Erstreckung der Länge der Außenstatormahlwerkzeuge 211 mit größerer Länge in axialer Richtung zu verstehen, d.h. der Bereich des Mahlraums 4, in welchem die Länge, in der Außenstatormahlwerkzeuge 211 mit größerer Länge im Mahlraum angeordnet sind. Mit anderen Worten entspricht dies, bei einer vertikalen Rührwerksmühle der Höhe der Prozesszone (Mahlraum 4), die durch die längeren Außenstatormahlwerkzeuge 211 abgedeckt wird.The height at which the longer outer
Bei einer beispielhaften Erstreckung der Außenstatormahlwerkzeuge 211 mit größerer Länge im Mahlraum 4 von 150 mm und einer Mahlraumlänge bzw. Länge des Außenstators 2 (Prozesszonenhöhe) von 500 mm ergibt sich ein Verhältnis von 0,3.With an exemplary extension of the outer
Das Verhältnis der Länge, in der Außenstatormahlwerkzeuge 211 mit größerer Länge in den Mahlraum 4 hineinragen, zum Außenstatorinnendurchmesser D2 beträgt bevorzugt zwischen 0,05 und 0,4, besonders bevorzugt zwischen 0,2 und 0,3. Bei einer Erstreckung der Außenstatormahlwerkzeuge 211 mit größerer Länge im Mahlraum 4 von 150 mm und einem Außenstatorinnendurchmesser D2 von 550 mm ergibt sich ein Verhältnis von 0,27.The ratio of the length by which external
In RWKM kann es im in Durchströmrichtung hinteren Bereich aufgrund der Schleppkräfte, und insbesondere in vertikalen RWKM auch aufgrund der Schwerkraft, während des Mahl- bzw. Dispergiervorgangs zu einer Ansammlung von Mahlhilfskörpern kommen. Auch bei horizontalen oder schrägen RWKM können sich aufgrund der Schleppkräfte Mahlhilfskörper in einem Teil des Mahlraums, insbesondere in Durchströmrichtung abwärts, ansammeln. Durch die verlängerten Außenstatormahlwerkzeuge im in Durchströmrichtung hinteren Bereich kommt es in der gesamten RWKM zu einer verbesserten Fluidisierung der Mahlhilfskörper. Eine Ansammlung von Mahlhilfskörpern in einem Teil der Maschine kann wirksam verhindert werden. Falls es doch zu einer Ansammlung von Mahlhilfskörpern während des Betriebs kommen sollte, kann diese durch den Einsatz längerer Stifte im unteren Bereich des Außenstators merklich aufgelockert und in Bewegung gebracht werden. Somit werden verbesserte Zerkleinerungsergebnisse bzw. bessere Vermahlungsergebnisse erzielt und die Produktqualität erhöht. Insbesondere ermöglicht die Anordnung eine tiefere Leistungsaufnahme bei dünnflüssigen Produkten mit niedrigen Viskositäten (Zähigkeit) und/oder geringerer Zügigkeit.In RWKM, an accumulation of auxiliary grinding bodies can occur in the rear area in the direction of flow due to the drag forces, and in particular in vertical RWKM also due to gravity, during the grinding or dispersing process. Even with horizontal or inclined RWKM, auxiliary grinding bodies can become displaced due to the drag forces accumulate in a part of the grinding chamber, especially in the flow direction downwards. The extended external stator grinding tools in the rear area in the flow direction result in improved fluidization of the auxiliary grinding bodies in the entire RWKM. Accumulation of grinding aids in a part of the machine can be effectively prevented. If there is an accumulation of grinding media during operation, this can be loosened up noticeably and set in motion by using longer pins in the lower area of the outer stator. Thus, improved comminution results or better grinding results are achieved and the product quality is increased. In particular, the arrangement enables a lower power consumption in the case of low-viscosity products with low viscosities (thickness) and/or less tackiness.
Des Weiteren können in der Maschine auftretende Vibrationen aufgrund von Mahlhilfskörperansammlungen verringert werden.Furthermore, vibrations occurring in the machine due to accumulations of grinding aids can be reduced.
Bevorzugt werden die Mahlwerkzeuge der vorliegenden Offenbarung eingeklebt. Dadurch wird eine verfahrenstechnische Manipulation an der Mühle während des Betriebs verhindert. Die Abdichtung der Werkzeuge zum Stator erfolgt durch Klebung, wodurch eine Verringerung der Kühlfläche vermieden wird. Bevorzugt sind die Werkzeuge des Außenstators in zwei unterschiedlichen definierten Längen vorgesehen. Somit gibt es nur eine Stufe der Werkzeuglänge in axialer Richtung. Dies gewährleistet ferner konstante Vermahlungsbedingungen über die gesamte Mahldauer.Preferably, the milling tools of the present disclosure are glued in place. This prevents procedural manipulation of the mill during operation. The tools are sealed to the stator by gluing, which avoids a reduction in the cooling surface. The tools of the outer stator are preferably provided in two different, defined lengths. Thus there is only one step of the tool length in the axial direction. This also ensures constant grinding conditions over the entire grinding time.
Die Erfindung kann auch in einer bestehenden RWKM angewendet werden, insbesondere in einer RWKM, deren Außenstatormahlwerkzeuge austauschbar ausgeführt sind. Um eine solche RWKM entsprechend nachzurüsten, werden die Außenstatormahlwerkzeuge der Reihen in Umfangsrichtung, die dem Zuführkanal abgewandt sind, durch Außenstatormahlwerkzeuge ersetzt, die eine entsprechend größere Länge aufweisen. Hierbei werden gemäß der vorliegenden Erfindung die Außenstatormahlwerkzeuge einer gewünschten Anzahl von Reihen ersetzt, also zumindest die Werkzeuge der in Durchströmrichtung hintersten Reihe bevorzug diejenigen der drei hintersten Reihen.The invention can also be used in an existing RWKM, in particular in a RWKM whose external stator grinding tools are designed to be exchangeable. In order to retrofit such a RWKM accordingly, the external stator grinding tools of the rows in the circumferential direction that are remote from the feed channel are replaced by external stator grinding tools that have a correspondingly greater length. Here, according to the present invention, the external stator grinding tools of a desired number of rows are replaced, ie at least the tools of the rearmost row in the direction of flow, preferably those of the three rearmost rows.
Obwohl die Erfindung mittels der Figuren und der zugehörigen Beschreibung dargestellt und detailliert beschrieben ist, sind diese Darstellung und diese detaillierte Beschreibung illustrativ und beispielhaft zu verstehen und nicht als die Erfindung einschränkend. Es versteht sich, dass Fachleute Änderungen und Abwandlungen machen können, ohne den Umfang der folgenden Ansprüche zu verlassen. Insbesondere umfasst die Erfindung ebenfalls Ausführungsformen mit jeglicher Kombination von Merkmalen, die vorstehend zu verschiedenen Aspekten und/oder Ausführungsformen genannt oder gezeigt sind.Although the invention has been illustrated and described in detail by means of the figures and the associated description, this illustration and this detailed description are to be understood as illustrative and exemplary and not as limiting the invention. It is understood that changes and modifications can be made by those skilled in the art without departing from the scope of the following claims. In particular, the invention also includes embodiments with any combination of features that are mentioned or shown above for different aspects and/or embodiments.
Die Erfindung umfasst ebenfalls einzelne Merkmale in den Figuren auch wenn sie dort im Zusammenhang mit anderen Merkmalen gezeigt sind und/oder vorstehend nicht genannt sind.The invention also includes individual features in the figures, even if they are shown there in connection with other features and/or are not mentioned above.
Im Weiteren schließt der Ausdruck "umfassen" und Ableitungen davon andere Elemente oder Schritte nicht aus. Ebenfalls schließt der unbestimmte Artikel "ein" bzw. "eine" und Ableitungen davon eine Vielzahl nicht aus. Die Funktionen mehrerer in den Ansprüchen aufgeführter Merkmale können durch eine Einheit erfüllt sein. Die Begriffe "im Wesentlichen", "etwa", "ungefähr" und dergleichen in Verbindung mit einer Eigenschaft beziehungsweise einem Wert definieren insbesondere auch genau die Eigenschaft beziehungsweise genau den Wert. Alle Bezugszeichen in den Ansprüchen sind nicht als den Umfang der Ansprüche einschränkend zu verstehen.Furthermore, the term "comprising" and derivatives thereof does not exclude other elements or steps. Likewise, the indefinite article "a" or "an" and derivatives thereof do not exclude a plurality. The functions of several features listed in the claims can be fulfilled by one unit. The terms “substantially”, “approximately”, “approximately” and the like in connection with a property or a value in particular also precisely define the property or the value. Any reference signs in the claims should not be construed as limiting the scope of the claims.
- 11
- Rotorrotor
- 1111
- Rotormahlwerkzeugerotor grinding tools
- 22
- Außenstatorouter stator
- 2121
- Außenstatormahlwerkzeugeexternal stator milling tools
- 211211
- Außenstatormahlwerkzeuge mit größerer LängeLonger length outer stator milling tools
- 2222
- Innenstatorinner stator
- 2323
- Abführraumdischarge room
- 33
- Trenneinrichtungseparator
- 44
- Mahlraumgrinding room
- 55
- Mittelachsecentral axis
- 66
- Ablaufkanaldrain channel
- 77
- Zuführkanalfeed channel
- d1d1
- Rotorinnendurchmesserrotor inside diameter
- D1D1
- Rotoraußendurchmesserrotor outer diameter
- D2D2
- Außenstatorinnendurchmesserouter stator inner diameter
- d22d22
- Innenstatoraußendurchmesserinner stator outer diameter
Claims (12)
- Agitator mill for treating flowable material to be milled, having a circular-cylindrical outer stator (2),an agitator which is mounted rotatably about a common central axis (5) and has a circular-cylindrical rotor (1), wherein the rotor (1) is arranged within the outer stator (2), andwherein a milling chamber (4) is formed between the rotor (1) and the outer stator (2), wherein a through-flow direction which extends from a feed channel (7) to a discharge channel (6) is defined in the milling chamber (4),wherein the milling chamber (4) has a constant width between the outer stator (2) and the rotor (1),wherein the milling chamber (4) is at least partially filled with milling elements, wherein a plurality of rotor milling tools (11) which extend in the direction of the outer stator (2) are attached to the rotor (1),wherein a plurality of outer-stator milling tools (21, 211) which project radially by a length into the milling chamber (4) are attached to the outer stator (2), andwherein the outer-stator milling tools (21, 211) are arranged adjacent to and spaced apart from one another in the circumferential direction and form rows, andthese rows are arranged parallel to one another along the central axis on the outer stator (2),wherein the outer-stator milling tools (211) of at least one row, preferably of three rows, of outer-stator milling tools (211) on the side of the milling chamber facing away from the feed channel (7) have a greater radial length than the remaining outer-stator milling tools (21), andwherein the outer-stator milling tools (21, 211) of each row have the same length in the circumferential direction.
- Agitator mill according to claim 1, wherein the outer stator (2) has six to twelve rows of outer-stator milling tools (21, 211) in the circumferential direction and/or eight to twenty longitudinal rows of outer-stator milling tools (21, 211) in the direction of the central axis (5).
- Agitator mill according to any one of the preceding claims, wherein a ratio of a number of outer-stator milling tools (211) having a greater radial length to a number of the remaining outer-stator milling tools (21) is between 0.1 and 0.5.
- Agitator mill according to any one of the preceding claims, wherein the agitator mill is arranged in operation such that the central axis (5) is oriented vertically and the through-flow direction in the milling chamber (4) runs from top to bottom, such that the lower row or the lower rows in the circumferential direction are the rows with outer-stator milling tools (211) of greater length.
- Agitator mill according to any one of the preceding claims, wherein the length of the outer-stator milling tools (211) having a greater radial length is longer than the length of the remaining outer stator milling tools (21) by a factor of 1.5 to 2.5, preferably 1.75 to 2.25 and most preferably 2.0.
- Agitator mill according to any one of the preceding claims, wherein the length of the remaining outer-stator milling tools (21) is between 5 and 20 mm, preferably between 7 and 15 mm.
- Agitator mill according to any one of the preceding claims, wherein the rotor milling tools (11) each have the same length.
- Agitator mill according to any one of the preceding claims, wherein the outer-stator milling tools (21, 211) and/or the rotor milling tools (11) are designed in the form of pins.
- Agitator mill according to claim 8, wherein the pins have a cylindrical shape, wherein the length is at least as great as the diameter of the pins.
- Agitator mill according to any one of the preceding claims, wherein a separating device (3) is provided within the rotor (1).
Applications Claiming Priority (2)
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EP20166428 | 2020-03-27 | ||
PCT/EP2021/057973 WO2021191430A1 (en) | 2020-03-27 | 2021-03-26 | Agitator ball mill |
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EP3946741A1 EP3946741A1 (en) | 2022-02-09 |
EP3946741B1 true EP3946741B1 (en) | 2023-08-23 |
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EP21715572.0A Active EP3946741B1 (en) | 2020-03-27 | 2021-03-26 | Agitator ball mill |
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US (1) | US20230158511A1 (en) |
EP (1) | EP3946741B1 (en) |
JP (1) | JP7454066B2 (en) |
KR (1) | KR102685935B1 (en) |
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FR1025708A (en) * | 1950-10-07 | 1953-04-20 | Suisse Jaruza A G Chur Sa | Trommel-crusher |
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DE2329987C2 (en) * | 1973-06-13 | 1982-12-02 | Gebrüder Netzsch, Maschinenfabrik GmbH & Co, 8672 Selb | Agitator mill |
DE2629251C2 (en) * | 1976-06-30 | 1987-03-19 | Draiswerke Gmbh, 6800 Mannheim | Agitator mill |
DD282612A5 (en) | 1989-04-25 | 1990-09-19 | Nagema Veb K | STRUCTURAL CONVERTER FOR THE CONTINUOUS PROCESSING OF DISPERSIONS |
DE4002613A1 (en) * | 1990-01-30 | 1991-08-01 | Draiswerke Gmbh | AGITATOR MILL |
EP0752274A1 (en) * | 1995-07-07 | 1997-01-08 | MAZZONI LB FOOD S.r.l. | Agitator mill for grinding solid particles in general and particularly solid particles dispersed in a continuous liped phase |
DE19638354A1 (en) | 1996-09-19 | 1998-03-26 | Draiswerke Inc Mahwah | Agitating milling machine for grinding free-flowing material |
JPH10113567A (en) * | 1996-10-08 | 1998-05-06 | Aimetsukusu Kk | Vertical wet type mill |
EP0913200B1 (en) * | 1997-10-28 | 2003-04-23 | DRAISWERKE GmbH | Agitator mill |
CN1307934A (en) * | 2001-02-12 | 2001-08-15 | 宜兴市洪流集团公司 | Improved sand mill |
JP2006255519A (en) * | 2005-03-15 | 2006-09-28 | Masumi Kusunoki | Medium circulation type crusher |
US20080191072A1 (en) | 2005-04-25 | 2008-08-14 | Gisbert Schall | Multi-Stage Agitator Mill |
DE502005000670D1 (en) * | 2005-05-19 | 2007-06-14 | Buehler Ag | agitating mill |
EP1943022B1 (en) | 2005-10-11 | 2010-03-31 | Bühler AG | Stirrer mill |
JP5401401B2 (en) * | 2010-06-07 | 2014-01-29 | ビューラー アーゲー | Agitator mill |
WO2013167851A1 (en) * | 2012-05-10 | 2013-11-14 | Belmonte Investments Limited | Attritor mill and process for using it |
CN205518018U (en) * | 2016-03-09 | 2016-08-31 | 青岛蓝色世纪国际贸易有限公司 | Nanometer macromolecule natural asphalt grinds machine |
CN206046120U (en) * | 2016-08-29 | 2017-03-29 | 罗星莲 | A kind of processing of the Chinese medicine with drying functions dismembyator |
CN207238219U (en) * | 2017-08-17 | 2018-04-17 | 深圳市叁星飞荣机械有限公司 | A kind of vertical material pearl separator without mechanical sealing medium Ball-stirring mill |
EP3536406A1 (en) * | 2018-03-07 | 2019-09-11 | Bühler AG | Agitator mill |
CN108499650B (en) * | 2018-06-16 | 2024-01-26 | 长沙学院 | Rotary cone stirring ball mill |
KR102057452B1 (en) * | 2019-03-12 | 2019-12-20 | 이유애 | System of continuous mass producing nano particle with classification |
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