EP3331647B1 - Separator, agitator ball mill and method of classifying of product mixtures - Google Patents

Description

The present invention relates to a separator, an agitator ball mill and a method for classifying product mixtures.

State of the art

The invention relates to a rotor finger of a rotor, which is arranged around a separation system in the region of the product outlet of agitator ball mills. The agitator ball mill is a device for coarse, fine and very fine comminution or homogenization of regrind. It consists of a grinding chamber with a stirrer in which grinding stock is comminuted by grinding media.

Agitator ball mills are usually constructed of a horizontally or vertically arranged, approximately circular cylindrical grinding container. The agitator ensures the intensive movement of the grinding media with suitable stirring elements. The agitator ball mills are filled through an opening in or adjacent to one of the end walls. The millbase suspension is pumped continuously through the grinding chamber. The suspended solids are crushed or dispersed by impact and shear forces between the grinding media. The discharge depends on the design and takes place, for example, through slots in the grinding chamber wall at the end of the mill, the grinding bodies being retained by a suitable separating device.

For example, a separating device is formed by a separating screen, wherein a rotor or rotor cage is arranged rotatably about the separating screen. The rotor or rotor cage sits on the stirrer shaft and is not driven separately. The rotor cage is formed in particular by a rotor disk, on whose outer edge rotor fingers are arranged. The rotor fingers are arranged axially to the longitudinal axis of the agitator shaft. Due to the rotational movement of the rotor fingers forming the cage around the separating screen, flows and Forces which prevent the grinding media and non-screenable product from adhering and / or clogging on the dividing screen.

Depending on the particular product and / or the respective grinding media used, different radial distances between the separating screen and the rotor fingers of the rotor cage are necessary in order to generate the necessary flows and forces. If the radial distance between the dividing screen and the rotor fingers is too large, then the necessary cleaning is insufficient or only given deficient. In particular, a so-called "string of pearls" can form, in which the grinding media, as on a string, settle in the grooves of the separating sieve and clog it up.

DE 69525334 T2 describes an attrition mill with a rotor cage separation system. In the area of the product outlet, a cylindrical separating sieve is arranged. This has openings whose dimensions are chosen so that they allow the outflow of sufficiently finely ground regrind, but retain the grinding media. Around the separation screen around a separator rotor is arranged. This consists of a rotor disk and your plurality of rotor fingers, which extend parallel to the agitator axis, are at the circumference of the rotor disk at the same angle and are located radially outside of the separating screen.

The rotation of the rotor fingers of the separator rotor about the separation screen causes axial rotation of the product-media mixture and prevents clogging of the separator screen with coarse particles flowing away from the separation screen through the rotor fingers.

Furthermore, there are embodiments in which the Trennsiebmaschen or column are larger than the grinding media used. Here, the separation of the grinding media from the product flow takes place purely by centrifugal forces. Also such embodiments are in the DE 69525334 T2 described. If these centrifugal forces are not sufficient, then the grinding media leaves the agitator ball mill with the product stream.

In order to prevent clogging of the separating screen, rotor fingers are known which have strips or wipers which reach as far as the separating screen and act like wipers. However, these strips or wipers have the disadvantage that they act directly on the dividing screen and product or Grinding can push into the mesh of the separation screen, which in turn can clog. Furthermore, there is a risk with very abrasive materials that the dividing screen wears faster or is destroyed. DE 4029139 A1 discloses an agitator mill with a separator according to the preamble of claim 1.

The object of the invention is to provide an improved separation system which does not have the above-mentioned disadvantages of the prior art.

The above object is achieved by a separation device, a stirred ball mill and a method for classifying product mixtures according to claims 1, 7, 10 and 13. Further advantageous embodiments are described by the subclaims.

description

The invention relates to a separation device for classifying product mixtures comprising at least two different (product) components. The separation device comprises a shaft, a stationary arranged sieve unit and a Klassierrotor. The sieve unit comprises sieve openings through which at least particles of at least one constituent of the product mixture can pass up to a certain diameter. The classifying rotor comprises a non-rotatably mounted on the shaft support plate and one or more mechanically coupled to the support plate essays that affect a flow behavior of the product mixture in the screen unit.

The one or more essays can be fixed in different position positions relative to the rotating shaft on the support plate. Depending on the respective position of one or more attachments, different flow behavior of the product mixture in the area of the sieve unit can be effected.

The support plate is preferably formed as a disc. According to a preferred embodiment of the invention, the support plate has a plurality of in a defined, each same radial distance from the center of the support plate arranged fixing. Adjacent fixing agents are in particular at a respective same angle spaced from each other. The essays have fastening means designed corresponding to the fixing means. The attachments can be fixed via the attachment means to the fixing in each case at least two different position positions.

The attachments can be fixed to the fixed positions defined by the fixing means in different positional positions, in particular in different rotational positions. The different position positions or rotational positions differ in that, in a first position position or first rotational position, a first minimum radial distance between the attachments and the sieve unit is different from a second minimum radial distance between the attachments and the sieve unit in a second position or second rotational position.

According to a further embodiment, it is provided that all attachments are arranged in the same position or rotational position, so that all attachments have the same minimum radial distance to the screen unit. Alternatively, it can be provided that the attachments are arranged alternately in a first rotational position and in a second rotational position, so that the attachments have a first minimum radial distance and a second minimum radial distance to the screen unit alternately. According to a further embodiment, a first part of the attachments are arranged in a first rotational position and a second, remaining part of the attachments in a second rotational position. The first part of the attachments has a first minimum radial distance and the second part of the attachments has a second minimum radial distance to the screen unit.

About a different arrangement of the articles in different rotational positions, the flow behavior of the product mixture can be selectively changed, thereby changing the Klassierwirkung the separator. Thus, you can be separated with a separator and a single type of essays different product mixtures.

According to the essays are rod-shaped and extend in the assembled state of the

Support plate from in the direction of the sieve unit. In particular, it is provided that the attached to the support plate essays are aligned parallel to the shaft and orthogonal to the support plate. The rod-shaped attachments have a continuous cross-section in the form of a rectangle, a rhombus or a kite quadrangle. The respective fastening means may be formed centered in the center of the cross section of the attachment or else the attachment means is formed decentralized to the center of the cross section of the attachment. The cross-section, the formation and / or arrangement of the fastener determine how many differing position positions or rotational positions can take the essays on the support plate. For the expert, this results in a variety of ways.

It is important that the arrangement of the essays on the support plate must be balanced so that no imbalance arises upon rotation of the support plate to the shaft. For example, in a straight total number of essays, only two oppositely disposed essays can be arranged in a first position position or first rotational position, while the remaining essays have a second position position or second rotational position. Alternatively, if the number of attachments is a multiple of two and a multiple of three, three rotor fingers each may be arranged at such regularly selected intervals that the separator does not imbalance when rotated about the shaft. For the skilled person thus results in a variety of different arrangements.

According to one embodiment of the invention, the support plate is a rotor disk, the attachments are rotor fingers and the screen unit is formed as a cylindrical separating screen, wherein the longitudinal axis of the separating screen is arranged coaxially to the rotating shaft of the separator. The rotor disk and the rotor fingers form a so-called rotor cage. The rotor disk has a plurality of fixing means arranged at a defined, respectively equal radial distance from the center of the rotor disk, wherein adjacent fixing means are arranged at a respective same angle at a distance from each other. The rotor fingers have corresponding to the fixing means formed fastening means and can in different position positions or rotational positions on the Fixing means are fixed to the fixing means of the rotor disc. In a first rotational position, a first minimum radial clearance is formed between the rotor finger and the separation screen, and in a second rotational position, a second minimum radial clearance is formed between the rotor finger and the separation screen, wherein the first minimum radial distance and the second minimum radial distance are different.

The fixing means are formed, for example, as orthogonal on the support plate in a radius around the center of the support plate arranged mounting rods, which have a substantially square cross-section. The rotor fingers have, for example, a rectangular cross-section, furthermore a receptacle extending at least partially from a free end of the rotor finger along the longitudinal axis of the rotor fingers, in each case one fastening rod, the receptacle corresponding to the cross-section of the fastening rods also being substantially square and centered in the center Cross-section of the rotor finger is arranged. The rotor finger can be mounted in four position positions on the mounting rod, wherein due to the central arrangement of the recording each two position positions result in an identical appearance of the rotor finger on the support plate.

If, on the other hand, the rotor finger has a different cross section, for example in the form of a rhombus or a kite quadrilateral, and / or the receptacle for the fastening rod is not centrally along the longitudinal axis of the rotor finger but decentralized thereto, then the rotor finger can be arranged in further position positions, respectively show a different appearance.

Depending on whether all the rotor fingers are arranged in the same position position or rotational position or in different position positions or rotational positions, a different flow behavior of the product mixture within the separation device, in particular on the separation screen, is generated now upon rotation of the shaft.

The invention further relates to a stirred ball mill comprising a cylindrical grinding container having a Mahlguteinlass and a Mahlgutauslass, wherein in the grinding container, a stirring shaft is arranged with stirring elements. In the agitating ball mill is the product to be ground mixed with grinding media, which cause a reduction of the product due to the continuous movement. At the Mahlgutauslass the grinding media are separated from the sufficiently ground product. While the grinding media remain in the grinding container, the milled product is discharged.

For the separation of grinding media and product, a separating device is arranged at the Mahlgutauslass comprising a stationary arranged sieve unit and at least one Klassierrotor. The sieve unit has sieve openings which can pass at least particles of the at least one constituent of the product mixture up to a certain diameter. The classifying rotor comprises a support plate which is seated non-rotatably on the agitator shaft of the agitator ball mill and one or more attachments mechanically coupled to the support plate in order to influence a flow behavior of the product mixture in the region of the sieve unit. The one or more attachments on the support plate are fixed in different position positions relative to the rotating shaft on the support plate such that depending on the respective position position different flow behavior of the product mixture, in particular consisting of vermahlendem product and grinding media, in the area of the screen unit are effected.

According to the invention, the agitator ball mill separation device has the above-described features of the general separation device and is designed according to one of claims 1 to 6, wherein the agitator shaft of the agitator ball mill functions as a shaft of the separation device.

The sieve unit has, for example, a cylindrical shape. The longitudinal axis of the cylinder is arranged in particular coaxially to the longitudinal axis of the agitator shaft. The center of the support plate of the separation device is arranged on the longitudinal axis of the agitator shaft and the extension of the longitudinal axis of the sieve unit. The support plate forming the classifying rotor with the attachments is in particular arranged such that the attachments extend around the sieve unit in the direction of the grinding stock outlet and upon rotation of the stirrer shaft about the cylindrical one Rotate sieve unit. This creates currents and suction effects that prevent seizing of the grinding media on the screen unit. In particular, the grinding media are thrown outward by the distances between the attachments of the classifying rotor and are thus conducted back into the grinding container.

The invention further relates to a method for classifying product mixtures by means of a separating device, in particular by means of a separating device described above. By changing the position position of individual or all attachments on the support plate, the flow behavior of the product mixture in the area of the sieve unit is deliberately changed in order to set the desired classifying effect. By changing the position position of the attachments, in particular minimum radial distances between the attachments and a center of the support plate can be changed and adjusted according to the desired flow behavior of the product mixture.

The method can also be used to classify product mixtures in a stirred ball mill, in particular for separating grinding media from ground product. In particular, the method can also be used to set minimum radial distances between the rotor fingers of an agitator ball mill separator and a screen unit of the agitator ball mill separator. For example, at least two rotor fingers fixed in a first rotary position are removed from the fixing means of the rotor disk of the agitator ball mill separator and fastened to the fixing means in a second rotational position, a first minimum radial distance between the at least two rotor fingers and the screen unit being different in the first rotational position a second minimum radial distance between the at least two rotor fingers arranged in a balanced manner on the support plate and the screening unit in the second rotational position.

figure description

• Figur 1 zeigt eine Trennvorrichtung gemäß dem herkömmlich bekannten Stand der Technik.
• Figur 2 zeigt eine Draufsicht auf eine Stützplatte beziehungsweise Rotorscheibe einer Trennvorrichtung gemäß dem herkömmlich bekannten Stand der Technik.
• Figur 3 zeigt eine Draufsicht auf eine Stützplatte beziehungsweise Rotorscheibe einer Trennvorrichtung mit daran angeordneten ersten Aufsätzen mit einem ersten Querschnitt gemäß dem herkömmlich bekannten Stand der Technik.
• Figur 4 zeigt eine Draufsicht auf eine Stützplatte beziehungsweise Rotorscheibe einer Trennvorrichtung mit daran angeordneten zweiten Aufsätzen mit einem zweiten Querschnitt gemäß dem herkömmlich bekannten Stand der Technik.
• Figur 5 zeigt eine Draufsicht auf eine Stützplatte beziehungsweise Rotorscheibe einer Trennvorrichtung mit daran angeordneten dritten Aufsätzen mit einem dritten Querschnitt in einer ersten Drehlage.
• Figur 6 zeigt eine Draufsicht auf eine Stützplatte beziehungsweise Rotorscheibe einer Trennvorrichtung mit daran angeordneten dritten Aufsätzen mit einem dritten Querschnitt in einer zweiten Drehlage.
• Figur 7 zeigt eine Draufsicht eine Stützplatte beziehungsweise Rotorscheibe einer Trennvorrichtung mit daran angeordneten dritten Aufsätzen mit einem dritten Querschnitt in einer dritten Drehlage.
• Figur 8 zeigt eine Draufsicht auf eine Stützplatte beziehungsweise Rotorscheibe einer Trennvorrichtung mit daran angeordneten dritten Aufsätzen mit einem dritten Querschnitt in einer vierten Drehlage.
• Figur 9 zeigt eine Draufsicht auf eine Stützplatte beziehungsweise Rotorscheibe einer Trennvorrichtung mit daran angeordneten vierten Aufsätzen mit einem vierten Querschnitt in einer ersten Drehlage.
• Figur 10 zeigt eine Draufsicht auf eine Stützplatte beziehungsweise Rotorscheibe einer Trennvorrichtung mit daran angeordneten vierten Aufsätzen mit einem vierten Querschnitt in einer zweiten Drehlage.
• Figur 11 zeigt eine Draufsicht auf eine Stützplatte beziehungsweise Rotorscheibe einer Trennvorrichtung mit daran angeordneten fünften Aufsätzen mit einem fünften Querschnitt in einer ersten Drehlage.
• Figur 12 zeigt eine Draufsicht auf eine Stützplatte beziehungsweise Rotorscheibe einer Trennvorrichtung mit daran angeordneten fünften Aufsätzen mit einem fünften Querschnitt in einer zweiten Drehlage.
• Figur 13 zeigt eine Draufsicht auf eine Stützplatte beziehungsweise Rotorscheibe einer Trennvorrichtung mit daran angeordneten fünften Aufsätzen mit einem fünften Querschnitt in einer dritten Drehlage.
• Figur 14 zeigt eine Draufsicht auf eine Stützplatte beziehungsweise Rotorscheibe einer Trennvorrichtung mit daran angeordneten fünften Aufsätzen mit einem fünften Querschnitt in einer vierten Drehlage.

In the following, embodiments of the invention and their advantages with reference to the accompanying figures will be explained in more detail. The proportions of the individual elements to one another in the figures do not always correspond to the actual size ratios, since some shapes are simplified and other shapes are shown enlarged in relation to other elements for better illustration.

• FIG. 1 shows a separator according to the conventionally known prior art.
• FIG. 2 shows a plan view of a support plate or rotor disk of a separator according to the conventionally known prior art.
• FIG. 3 shows a plan view of a support plate or rotor disk of a separator with arranged thereon first essays with a first cross section according to the conventionally known prior art.
• FIG. 4 shows a plan view of a support plate or rotor disk of a separator with second attachments arranged thereon with a second cross section according to the conventionally known prior art.
• FIG. 5 shows a plan view of a support plate or rotor disk of a separator with third attachments arranged thereon with a third cross section in a first rotational position.
• FIG. 6 shows a plan view of a support plate or rotor disk of a separator with third attachments arranged thereon with a third cross section in a second rotational position.
• FIG. 7 shows a plan view of a support plate or rotor disk of a separator with third attachments arranged thereon with a third cross-section in a third rotational position.
• FIG. 8 shows a plan view of a support plate or rotor disk of a separator with arranged thereon third essays with a third cross section in a fourth rotational position.
• FIG. 9 shows a plan view of a support plate or rotor disk of a separation device arranged thereon fourth essays with a fourth cross section in a first rotational position.
• FIG. 10 shows a plan view of a support plate or rotor disk of a separation device arranged thereon fourth essays with a fourth cross section in a second rotational position.
• FIG. 11 shows a plan view of a support plate or rotor disk of a separator with fifth attachments arranged thereon with a fifth cross section in a first rotational position.
• FIG. 12 shows a plan view of a support plate or rotor disk of a separator with fifth attachments arranged thereon with a fifth cross section in a second rotational position.
• FIG. 13 shows a plan view of a support plate or rotor disk of a separator with arranged fifth attachments with a fifth cross section in a third rotational position.
• FIG. 14 shows a plan view of a support plate or rotor disk of a separator with fifth attachments arranged thereon with a fifth cross section in a fourth rotational position.

For identical or equivalent elements of the invention, identical reference numerals are used. Furthermore, for the sake of clarity, only reference symbols are shown in the individual figures, which are required for the description of the respective figure. The illustrated embodiments are merely examples of how the device or method of the invention may be configured and are not an exhaustive limitation.

FIG. 1 shows a separator 5 according to the conventionally known prior art. FIGS. 2 to 4 each show a plan view of a support plate or rotor disk 8 of a separator 5 according to the conventionally known prior art.

Agitator ball mills comprise an agitator comprising a stirring shaft 3 and stirring elements arranged thereon, the stirring shaft 3 generally being arranged coaxially with the longitudinal axis of the cylindrical grinding container (not shown) and extending from the drive side of the agitating ball mill in the direction of product outlet 4 of the agitating ball mill. The agitator ensures by the rotation of suitable stirring elements to the agitator shaft 3 for the intensive movement of the grinding media. The discharge of sufficiently ground product takes place via the product outlet 4 at the end of the mill, the grinding bodies being retained by a separating device 5.

The separating device 5 is formed by a separating sieve 6, a shaft 2 and a classifying rotor 1. In the illustrated agitator ball mill, the agitator shaft 3 simultaneously acts as shaft 2 of the separation device. The classifying rotor 1 is disposed at the outlet end of the stirring shaft 3, in particular, the classifying rotor 1 is rotatably arranged around the separating screen 6. The classifying rotor 1 is designed, in particular, as a rotor cage 7 and consists of a rotor disk 8 arranged on the agitator shaft 3, on the outer edge of which rotor fingers 9 are arranged in a regular arrangement. The rotor fingers 9 are aligned parallel to the longitudinal axis of the agitator shaft 3. As a result of the rotational movement of the rotor fingers 9 about the separating sieve 6, currents and forces which prevent the grinding bodies and non-sieving product from adhering to or blocking the separating sieve 6 arise.

In order to be able to set different radial distances between the separating sieve 6 and the rotor fingers 9 of the rotor cage 7 as a function of the respective product and / or the respective grinding bodies used, fixing units 10 are provided on the rotor disk 8 on which different rotor fingers 9a, 9b are arranged and fastened can be (compare in particular FIGS. 3 and 4 ).

The fastening units 10 are designed, in particular, as fixing rods 11 which are arranged fixedly on the rotor disk 8 and which have an approximately square cross-section. The fastening rods 11 are arranged at the same angle at the same angle to each other on the circumference of the rotor disk 8 and extend parallel to the stirring shaft 3.

FIG. 3 shows an arrangement of first essays or rotor fingers 9a with a first, approximately square cross section Qa and a side length sa and FIG. 4 shows an arrangement of second essays or rotor fingers 9b with a second, approximately square cross section Qb and a side length sb. The rotor fingers 9a, 9b each have a centrally arranged receptacle 12. The receptacle 12 is corresponding to the cross section of the mounting rods eleventh formed so that the rotor fingers 9a, 9b can be easily plugged and fixed to the mounting rods 11.

Due to the different cross sections Qa, Qb of the rotor fingers 9a, 9b, each with different side lengths s-a, s-b, different minimum radial distances Ra, Rb between the rotor fingers 9a, 9b and the separating screen 6 result.

The first rotor fingers 9a have a first cross section Qa with a first side length s-a. This results in a first minimum radial clearance Ra between a first rotor finger 9a mounted on the fixing rod 11 and the separating screen 6. The second rotor fingers 9b have a second cross section Qb with a second side length s-b. Since the second side length s-b is greater than the first side length s-a, it follows that the second cross-section Qb is larger than the first cross-section Qa. This results in a second minimum radial distance Rb, which is smaller than the first minimum radial distance Ra described above, between a second rotor finger 9b mounted on the fixing rod 11 and the separating screen 6.

By using different rotor fingers 9a, 9b with different sized cross sections 9a, 9b, the minimum radial distance R between the respective rotor finger 9 and the separating screen 6 can thus be changed and adapted to the respective product or to the grinding media used in order to achieve the desired flow behavior and thus optimize the classifying effect.

The disadvantage is that different rotor fingers 9a, 9b with different cross-sections Qa, Qb must be kept as exchangeable format parts.

FIGS. 5 to 8 each show a plan view of a support plate or rotor disk 8 of a separating device arranged thereon third essays or rotor fingers 9c with a third cross section Qc in different arrangements or position positions or rotational positions D1 to D4. The rotor fingers 9c have a rectangular cross section Qc with different side lengths s1 and s2. That is, the rotor fingers 9c have in particular no square cross section as a special case of a rectangle. The receptacle 12 is arranged decentralized to the center Mc of the cross section Qc of the rotor finger 9c, so that in each case different radial distances between the receptacle 12 and the respective sides s1, s2 of the rectangular cross section Qc are formed.

Depending on the orientation or rotational position D1, D2, D3, D4 of the rotor finger 9c is placed on the mounting rod 11, resulting in different minimum radial distances Rc1, Rc2, Rc3, Rc4 between the rotor finger 9c and the separating screen. 6

In this first embodiment of the invention, a square rotor finger according to the prior art (see. FIGS. 3 and 4 ) extended on the side facing the screen, so that a rectangular cross section Qc is formed. By extending the rotor finger 9c to the separating screen 6, the radial distance Rc1 between the rotor finger 9c and the separating screen 6 is reduced in such a way that improved cleaning of the separating screen 6 is ensured.

According to one embodiment of the invention, the receptacle 12 may be formed such that the minimum radial distances Rc2 and Rc4 formed each have the same amount. According to a further embodiment, the receptacle 12 may be formed such that the minimum radial distances Rc2, Rc3 and Rc4 formed each have the same amount and only the minimum radial distance Rc1 in the first rotational position D1 clearly differs.

FIGS. 9 and 10 each show a plan view of a support plate or rotor disk 8 of a separating device arranged thereon fourth essays or rotor fingers 9d with a fourth cross-section Qd in different arrangements or position positions or rotational positions D1 and D2. The rotor fingers 9c have a rectangular cross section Qc with different side lengths s1 and s2. That is, the rotor fingers 9d in particular have no square cross section as a special case of a rectangle. The receptacle 12 is arranged centrally to the center Md of the cross section Qd of the rotor finger 9d, so that in each case equal distances between the receptacle 12 and the two sides s1 and the two sides s2 of the rectangular cross section Qd are formed. Thus it follows that a rotor finger 9d can be arranged in two differing rotational positions D1 and D2 with different minimum radial distances Rd1 and Rd2.

Depending on the orientation or rotational position D1 or D2 of the rotor finger 9d is placed on the mounting rod 11, resulting in different minimum radial distances Rd1 or Rd2 between the rotor finger 9d and the separating screen. 6

In this embodiment, the side s1 or s2 facing the separation screen 6 can be replaced by rotating the rotor finger 9d by 180 degrees when it is worn. Thus, the entire rotor finger 9d need not be replaced and replaced with every wear.

FIGS. 11 to 14 each show a plan view of a support plate or rotor disk 8 of a separating device arranged thereon fifth essays or rotor fingers 9e with a fifth cross section Qe in different arrangements or position positions or rotational positions D1 to D4. The rotor fingers 9e have a cross section Qe in the form of a kite quadrilateral, in particular with two pairs of equally long adjacent sides with the different side lengths s1 and s2. The receptacle 12 is arranged in the illustrated embodiment, centrally to the intersection of the diagonal Me of the cross section Qe of the rotor finger 9e.

The rotor finger 9e can be arranged in four different rotational positions D1 to D4 on the mounting rod 11, wherein each result in different minimum radial distances Re1, Re2, Re3, Re4 between the rotor finger 9e and the separating screen 6.

By using a rotor finger with a comparable cross section Qe, in which the receptacle 12 is formed decentralized to the intersection of the diagonals and / or arranged in a rotated orientation, there are a variety of other possible variations.

In the in the FIGS. 11 to 14 1, the rotor fingers 9e have the shape of a quadrangle in cross section Qe, that is to say they show in cross-section Qe two pairs of equally long, adjacent sides s1 and s2, where the diagonals halve each other and the lengths of s1 and s2 are different. In this embodiment, for example FIG. 11 or FIG. 12 the longer sides s1 of the kite quadrangle are mounted in the direction of the dividing screen 6. This corresponds to the rotational positions D1 and D2. Due to the shape of the kite quadrangle, a kind of slider, which however does not touch the separating sieve 6, thus arises above the separating sieve 6. At the top of the rotor finger 9e part of the Mahlkörper- product mixture is derived and returned from the separating screen 6 back into the grinding chamber. At the intermediate space Z formed between the rotor finger 9e and the separating screen 6, in contrast to the prior art, increased flows occur, through which impurities are fluidized and detached on the separating screen 6.

Depending on the orientation or rotational position D1, D2, D3, D4 of the rotor finger 9e is placed on the mounting rod 11, resulting in different minimum radial distances Re1, Re2, Re3, Re4 between the rotor finger 9e and the separation screen. 6

According to a further, not shown embodiment, the rotor fingers of this embodiment are designed such that the cross section represents a crooked dragon, in which the longer, the separating screen facing sides have different lengths. Thus, it is possible to cover various cleaning requirements. These cleaning requirements may vary with different products and / or grinding media.

When arranging the rotor fingers 9 on the rotor disk 8, attention must always be paid to a balanced arrangement and / or alignment of the rotor fingers 9 in the rotor cage. By this is meant that, for example, in an even number of rotor fingers, at least two opposing rotor fingers must be provided with an enlargement / expansion. Since the cage is moved at high rotational speeds, an imbalance otherwise arises, which can severely impair the function of the classifying rotor. If the imbalance of the rotor cage is too large, it may even lead to destruction of the separating screen when it is struck or penetrated by the protruding parts.

The invention has been described with reference to a preferred embodiment. However, it will be apparent to those skilled in the art that modifications or changes may be made to the invention without departing from the scope of the following claims.

LIST OF REFERENCE NUMBERS

1

classifying

2

wave

3

agitator shaft

4

product outlet

5

separating device

6

separating screen

7

rotor cage

8th

rotor disc

9

rotor fingers

10

fixing unit

11

mounting rod

12

admission

D

rotational position

M

Center point or intersection of the diagonals

Q

cross-section

R

Radial distance / radial distance

s

page length

Z

gap

Claims (13)

1. Separating device (5) for classifying product mixtures comprising at least two different components, the separating device (5) comprising:

   - a shaft (3);

   - a sieve unit (6) arranged fixed, which can pass at least particles of at least one component of the product mixture up to a specific diameter, and

   - at least one classifying rotor (1) which comprises a support plate (8) sitting rotationally fixed on the shaft (3) and one or more attachments (9) mechanically coupled to the support plate (8), in order to influence a flow behaviour of the product mixture in the region of the sieve unit (6), wherein

   the one or more attachments (9) can be fixed on the support plate (8) in different positions relative to the rotating shaft (3), such that, depending on the given positions, different flow behaviours of the product mixture can be brought about in the region of the sieve unit (6), characterised in that the attachments (9) are constituted rod-shaped and have a continuously rectangular cross-section (Q) or a continuous cross-section (Q) in the form of a rhombus or in the form of a kite.
2. The separating device (5) according to claim 1, characterised in that the support plate (8) comprises a plurality of fixing means arranged at a defined, in each case equal radial distance (R) from the centre-point of the support plate (8), wherein adjacent fixing means (11) are arranged spaced apart in each case by the same angle, wherein the attachments (9) comprise fastening means (10, 11) constituted corresponding to the fixing means (11) and wherein the attachments (9) are fixed to the fixing means (11) by means of the fastening means (10, 11).
3. The separating device (5) according to claim 2, wherein the attachments (9) can be fixed at the fixing positions defined by the fixing means (11) in different positions, in particular in at least two different rotational positions (D1, D2), wherein a first minimal radial distance (R) between the attachments (9) and the sieve unit (6) in a first position or first rotational position (D1) is different relative to a second minimal radial distance (R) between the attachments (9) and the sieve unit (6) in a second position or second rotational position (D2).
4. The separating device (5) according to claim 3, wherein all the attachments (9) are arranged in the same position or rotational position, so that all the attachments (9) have the same minimal radial distance (R) from the sieve unit (6).
5. The separating device (5) according to claim 3, wherein the attachments (9) are arranged alternately in a first rotational position and in a second rotational position, so that the attachments (9) alternately have a first minimal radial distance (R) and a second minimal radial distance (R) from the sieve unit (6) or wherein a first part of the attachments (9) is arranged in the first rotational position and a second, remaining part of the attachments (9) is arranged in a second rotational position, so that the first part of the attachments (9) has a first minimal radial distance and the second part of the attachments (9) has a second minimal radial distance from the sieve unit (6).
6. The separating device (5) according to any one of the preceding claims, wherein the fastening means (10, 11) is constituted centered in the centre-point of the cross-section (Q) of the attachment (9) or wherein the fastening means (10, 11) is constituted decentralised with respect to the centre-point (M) of the cross-section (Q) of the attachment (9).
7. An agitator ball mill comprising a cylindrical grinding chamber, which comprises a grinding stock inlet and a grinding stock outlet (4), wherein an agitator shaft (3) with agitator elements is arranged in the grinding container, with a separating device (5) according to any of claims 1 to 6 arranged before the grinding stock outlet (4), wherein the agitator shaft (3) of the agitator ball mill acts as a shaft (2) of the separating device (5).
8. The agitator ball mill according to claim 7, wherein the sieve unit (6) has a cylindrical shape and wherein a longitudinal axis of the sieve unit (6) is arranged coaxial with the longitudinal axis of the agitator shaft (3).
9. The agitator ball mill according to claim 8, wherein the centre-point of the support plate (8) of the separating device (5) is arranged on the longitudinal axis of the agitator shaft (3) and the extension of the longitudinal axis of the sieve unit (6).
10. A method for classifying product mixtures by means of a separating device (5) according to claims 1 to 6 with a fixed sieve unit (6), a support plate sitting rotationally fixed on a shaft (3), wherein the support plate (8) comprises one or more attachments (9) coupled mechanically to the support plate (8), wherein positions of the attachments (9) can be fixed differently on the support plate (8), in order to change the flow behaviour of the product mixture in the region of the sieve unit (6) and to adjust a desired classifying effect.
11. The method according to claim 10, wherein minimal distances between the attachments (9) and a centre-point of the support plate (8) are adjusted depending on the desired flow behaviour of the product mixture.
12. The method according to claim 10, wherein minimal distances between the attachments (9) and the sieve unit (6) of the separating device (5) are adjusted for setting the desired classifying effect.
13. The method for classifying product mixtures in an agitator ball mill according to any one of claims 7 to 9, wherein minimal distances between the attachments (9) and the sieve unit (6) of the separating device (5) are adjusted for setting a desired classifying effect.

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