EP3357580A1 - Agitator ball mill with ceramic lining - Google Patents

Abstract

The invention relates to a stirred ball mill (10), with
a grinding container (12) whose inside (28) consists of a ceramic material, the grinding container (12) extending along an axis (X) and having an internal diameter (d),
- One within the grinding container (12) arranged around the axis (X) rotatably driven rotor (20) facing the inside of the grinding container (12) surface (30), wherein between the surface (30) of the rotor (20) and the inside of the grinding container (12) has a grinding gap (32) with a grinding gap width (MS),
- A plurality of cams (34) which are mounted on the inside (28) of the grinding container (12) and extend radially inwardly from the inside of the grinding container with a height (h) normal to Mahlbehälterinnenseite.
According to the invention
- The inside of the grinding container (12) formed by a one-piece container tube (14) made of ceramic material,
the ratio of the height (h) of each cam (34) and the inside diameter (d) of the grinding container (12) ≤ 0.05, and
- The ratio of the height (h) of each cam (34) and the Mahlspaltweite (MS) ≤ 0.35.

Description

The invention relates to stirred mills, in particular stirred mills with a grinding container whose inside consists of a ceramic material. Such a stirring mill is from the DE 37 23 558 A1 known.

Agitator mills, often referred to as agitator ball mills, are nowadays widely used in the manufacturing industry to finely comminute materials and in particular to produce powders. The operating principle of an agitator mill is based on the fact that an annular grinding gap is formed between the inside of a grinding container and a rotor arranged in the grinding container, in which the material to be comminuted is located during operation of the agitator mill. By rotating the rotor driving the material to be crushed in the grinding gap is claimed so that it is crushed, for example by collision of particles with each other, by shear forces, etc. To reinforce the crushing effect are often on the inside of the grinding container and / or on the outer circumference of the rotor projections such as cams, rods or the like arranged, on the one hand promote mixing of the material to be crushed and on the other hand, for example, increase the number of collision occurring in the grinding gap drastically, which increases the crushing effect of a stirred mill. In general, the grinding gap of a stirred mill is largely filled with auxiliary grinding bodies, which are mostly spherical and are therefore also referred to as grinding balls. In such stirred ball mills, the material to be comminuted is in particular also comminuted by the action of the grinding auxiliary body moving during operation. The grinding container and arranged in it for rotation rotor often have a cylindrical shape, but other shapes are possible and known, for. B. frustoconical rotors and mating container designed to match.

Depending on the nature of the grinding task to be solved, the grinding container of an agitator mill must consist of a material which is as abrasion-resistant and inert as possible, and which often also has to be very temperature-resistant. For this purpose, it is known to provide the grinding container with a ceramic Mahlraumauskleidung (see the above-mentioned DE 37 23 558 A1 ). In particular, when a stirred ball mill has a larger grinding volume or a high power input is desired, there is the problem of sufficient cooling of the crushed Materials during the milling process. In addition, there is a risk that the Mahlhilfskörper not sufficiently mix with the product to be crushed and therefore only an insufficient grinding result is achieved.

The present invention has for its object to provide an agitator mill, which allows a high power input during grinding, without causing the material to be crushed is exposed to excessive temperatures, and also achieves reproducible good and uniform grinding results.

This object is achieved on the basis of the aforementioned generic prior art according to the invention in that the inside of the grinding container is formed by a one-piece container tube made of ceramic material, that a ratio of the height of each cam normal to Mahlbehälterinnenseite and the inner diameter of the grinding container ≤ 0, 05, and that a ratio of the height of each cam normal to the inside of the grinding bowl and the grinding gap width is ≦ 0.35. The described features mean that in an agitator mill according to the invention, the cams or projections have a large base area in relation to their height both with respect to the overall inner diameter of the grinding container and with respect to the Mahlspaltweite, whereby on the one hand better cooling of the material to be crushed can take place, because the large base area dissipates heat more effectively into the grinding container, and on the other hand, a sensitivity of the cams or projections, in particular in the case of ceramic material, with respect to removal or breaking is markedly reduced. The one-piece design of the container tube promotes both stability and heat dissipation, eliminating potential breakpoints and thermal conduction barriers.

According to a preferred embodiment, the one-piece container tube made of ceramic material on its outer peripheral side is not in contact with a e.g. steel jacket, but is installed with radial distance to other protective or supporting components of the agitator mill. In this way, caused by different coefficients of thermal expansion stresses are avoided, which could adversely affect the integral container tube made of ceramic material. Furthermore, the heat dissipation to the outside is further improved.

Preferably, both the container tube and the cams made of silicon carbide, SiC, or silicon carbide with free silicon, SiSiC. These two ceramic materials have high wear resistance, low thermal shock sensitivity, Low thermal expansion, high thermal conductivity, good resistance to acids and alkalis and are also still lightweight and retain their positive properties up to temperatures well above 1000 ° C.

In addition to the above-mentioned conditions, it has been found to be advantageous if each cam has a connecting surface to Mahlbehälterinnenseite with a largest width and the ratio of the height of each cam normal to Mahlbehälterinnenseite and the largest width is greater than 0.2. The just mentioned connection surface corresponds to the base surface of each cam described above and means the surface with which each cam is in contact with the grinding container inside.

Furthermore, it has been found to be advantageous if each cam has a connection surface to Mahlbehälterinnenseite with a maximum length and the ratio of the height of each cam and the largest length is less than 1.

It is also advantageous if each cam has a connection surface to the inside of the grinding container with a maximum length and a greatest width, wherein the ratio of the greatest width and the greatest length is less than 1.

The aforementioned advantageous embodiments may be used alone or combined with each other and reinforce each of the advantageous effects outlined above.

For a good stability of the cams and to achieve a uniformly good grinding result, it is advantageous if each cam has a connection surface to Mahlbehälterinnenseite and a frontal inflow, wherein a ratio of a projection of the frontal inflow surface on a normal to Mahlbehälterinnenseite level and the size of Connection area is less than 1. In this case, an angle of inclination of the frontal inflow surface with respect to the plane normal to Mahlbehälterinnenseite be in a range of -45 ° to 85 °. An angle of 0 ° in this case corresponds to an inflow surface arranged normally with respect to the grinding container inside, whereas angles with a negative sign denote undercut inflow surfaces, that is, inflow surfaces which are inclined in such a way that they virtually roof over a certain area of the grinding container inside. Inclination angles with a positive sign thus indicate frontal inflow surfaces, which are inclined in reverse, ie in which the end of the inflow surface located on the inside of the grinding container is first flown.

In principle, it is advantageous to provide a plurality of cams on the inside of the grinding container to promote the desired interaction with the material to be comminuted. In this case, the grinding container can also have cam-free areas on its inside, or it can have more cams in some areas and fewer cams in other areas. In addition, not all cams must be the same, but can be arranged in different shapes and sizes in different areas.

In terms of the problem to be solved, it may be advantageous that in the circumferential direction of Mahlbehälterinnenseite more cams in a row along a circumferential line are arranged successively and a distance between circumferentially consecutive cams is equal to or greater than the largest length of a cam.

If a plurality of cams are arranged successively in succession along a plurality of circumferentially spaced-apart circumferential lines, then an axial distance between each two axially adjacent rows of cams is advantageously greater than or equal to 1.1 times the maximum width of a cam. If cams in the axial direction spaced from each other on the Mahlbehälterinnenseite, then these cams can either be axially aligned or offset from each other.

Finally, it may be advantageous to arrange some or all of the cams in plan view at an angle to the associated peripheral line, this angle preferably being in a range of -22.5 ° to 22.5 ° relative to those at an angle of zero ° arranged, associated peripheral line.

In order to further enhance the interactions desired for comminution, it is also possible in a known manner for the rotor to be provided with projections projecting radially outward, for example in the form of stirring rods. These projections and the surface of the rotor may also be made of ceramic material, in particular silicon carbide or silicon carbide with free silicon. The projections or stirring rods on the rotor may or may not be immersed in the gaps between the cam or cam rows when the rotor rotates. In the former case, it is said that the stirring rods overlap with the cams, ie an outer circle diameter of the stirring rods is greater than an inner circle diameter of the cams. By contrast, non-overlapping stirrers or projections are used when the stirrer bars are too short to immerse in the axial spaces between cams or cam rows.

If projections are provided on the inside of the grinding container and, moreover, projections on the outer peripheral surface of the rotor, then advantageously the projections (cams) on the Mahlbehälterinnenseite smaller than the projections (stirring rods) on the rotor or the stirring shaft. In the context of the present description, for the purpose of simpler differentiation between projections on the inner side of the grinding container, the projections are referred to as cams and projections on the rotor or the stirring shaft are referred to as stirring rods. However, with these designations chosen for the sake of simpler differentiation, no different meaning content should be connected; H. it is both the cams and the Rührstäben to projections whose shape should not be limited by the chosen name. Both the protrusions on the inside of the grinding bowl and the protrusions on the rotor or agitator shaft can have any shape, size and arrangement which are considered to be suitable for achieving a desired grinding result.

Figur 1

eine schematische Darstellung einer erfindungsgemäßen Rührwerksmühle im Axialschnitt,

Figur 2

eine räumliche Darstellung eines Endes eines einstückigen Behälterrohres, das eine Mahlbehälterinnenseite ausbildet, auf der Nocken gemäß einer ersten Ausführungsform angeordnet sind,

Figur 3

eine Seitenansicht eines der Nocken aus Fig. 2,

Figur 4

eine Ansicht ähnlich Figur 2, jedoch mit Nocken an der Mahlbehälterinnenseite gemäß einer zweiten Ausführungsform,

Figur 5

eine Ansicht ähnlich Figur 4, jedoch mit Nocken an der Mahlbehälterinnenseite gemäß einer dritten Ausführungsform,

Figur 6

eine Ansicht ähnlich Figur 4, jedoch mit Nocken an der Mahlbehälterinnenseite gemäß einer vierten Ausführungsform,

Figur 7

eine Ansicht ähnlich Figur 4, jedoch mit Nocken an der Mahlbehälterinnenseite gemäß einer fünften Ausführungsform,

Figur 8

eine Ansicht ähnlich Figur 4, jedoch mit Nocken an der Mahlbehälterinnenseite gemäß einer sechsten Ausführungsform,

Figur 9

eine Detailansicht eines Abschnitts des Mahlspalts mit Nocken an der Mahlbehälterinnenseite gemäß der zweiten Ausführungsform und Rührstäben am Rotor in nicht überlappender Konfiguration, und

Figur 10

eine Ansicht ähnlich Figur 9, jedoch mit Nocken an der Mahlbehälterinnenseite gemäß der fünften Ausführungsform und Rührstäben am Rotor in überlappender Anordnung.

For a better understanding of the invention, preferred embodiments of an agitator mill according to the invention will be explained in more detail below with reference to the attached, schematic figures. It shows:

FIG. 1

a schematic representation of an agitator mill according to the invention in axial section,

FIG. 2

a spatial representation of an end of a one-piece container tube forming a Mahlbehälterinnenseite, are arranged on the cam according to a first embodiment,

FIG. 3

a side view of the cam Fig. 2 .

FIG. 4

a view similar FIG. 2 , but with cams on the inside of the grinding container according to a second embodiment,

FIG. 5

a view similar FIG. 4 , but with cams on the inside of the grinding container according to a third embodiment,

FIG. 6

a view similar FIG. 4 , but with cams on the inside of the grinding container according to a fourth embodiment,

FIG. 7

a view similar FIG. 4 but with cams on the inside of the grinding container according to a fifth embodiment,

FIG. 8

a view similar FIG. 4 , but with cams on the inside of the grinding container according to a sixth embodiment,

FIG. 9

a detail view of a portion of the refining gap with cams on the Mahlbehälterinnenseite according to the second embodiment and stirring bars on the rotor in non-overlapping configuration, and

FIG. 10

a view similar FIG. 9 but with cams on the inside of the grinding container according to the fifth embodiment and stirring bars on the rotor in an overlapping arrangement.

FIG. 1 shows an agitator mill, generally designated 10 with a here cylindrical grinding container 12, the peripheral boundary is formed by a one-piece container tube 14 made of ceramic material whose center longitudinal axis X is also the axis along which the grinding container 12 extends. The container tube 14 and thus the grinding container 12 has an inner diameter d and is received in a manner not shown between two end flanges 16, 18 which limit the grinding container 12 axially.

In the grinding container 12, a rotatably mounted about the axis X rotor 20 is arranged, which is often referred to as a stirring shaft. The rotor 20 can be rotated by a drive of the agitator mill 10, not shown here in the illustrated embodiment and extends over almost the entire length of the grinding container 12, but may also be significantly shorter than the grinding container in other embodiments. For the sake of simplicity, is in FIG. 1 only one half of the agitator mill 10 is shown, but it will be understood that the other, in FIG. 1 not shown half has a mirror image to the axis X has.

To protect the sensitive to shocks container tube 14 made of ceramic material is on the outer peripheral side at a radial distance from the container tube 14, a sheath 22 in the form of a thin-walled cylindrical steel tube, which is supported by two end, annular flanges 24, 26, which in turn, as shown on the flanges 16, 18 supported axially. If desired or necessary, the existing between the enclosure 22 and the container tube 14 annulus 15 can be traversed by a cooling or heating fluid.

A grinding gap 32 having a grinding gap width MS is formed between a grinding container inner side 28 formed by the container tube 14 and a surface 30 of the rotor 20 facing this grinding container inner side. The grinding gap 32 extends between the said surfaces in an annular manner around the axis X and is at least approximately completely filled with material to be comminuted and optionally with grinding aid bodies (not shown) during operation of the agitating mill 10, so that when the rotor 20 rotates in the grinding gap 32 a Grinding of the material to be shredded takes place.

To intensify the milling process in the grinding gap 32 a plurality of radially inwardly projecting projections are present on the Mahlbehälterinnenseite 28, which are referred to here as cam 34 and with a height h normal to Mahlbehälterinnenseite 28 radially inwardly into the grinding gap 32 and the grinding container 12 extend. These cams 34 may be formed integrally with the container tube 14 or may be suitably attached to the interior of the grinding container 28. Furthermore, the rotor 20 is also provided with projections projecting radially outwardly from its peripheral surface 30, which projections are referred to as stirring rods 36 in the exemplary embodiment shown, due to their rod-shaped configuration. These stirrers 36 have a height H normal to the surface 30 and, like the cams 34, may be either integral with the rotor 20 or may be suitably secured to the rotor 20 afterwards.

FIG. 2 shows a spatial representation of an end of the one-piece container tube 14 made of ceramic material in a removed from the agitator mill 10 state. It can be clearly seen that a plurality of cams 34 are arranged on the inside of the grinding container 28 along a plurality of circumferential lines U which are spaced apart from each other in the axial direction X (a circumferential line U is shown by way of example in FIG Fig. 2 shown) of Mahlbehälterinnenseite are arranged in succession in each case in a row. The distance between two axially adjacent cam rows is denoted by a, the distance between two along a circumferential line in the circumferential direction of successive cam 34, however, with A. Im in FIG. 2 illustrated embodiment, all cams 34 in the circumferential direction the same distance A from each other, the axial distance a between each two rows of cams is the same for all rows of cams and the successive in the axial direction cam 34 are aligned with each other. Not at As shown embodiments, however, the cams of two axially adjacent rows of cams can be arranged offset to one another and / or the distance A in the circumferential direction can vary, even within a single row of cams. In addition, the axial distance a need not be the same for all rows of cams, but can be chosen differently, for example, to increase or decrease a cam density in certain sections of Mahlbehälterinnenseite 28.

Each cam 34 is characterized by certain parameters, of which the greatest height h measured normal to Mahlbehälterinnenseite 28 has already been mentioned. The largest height h of the cam 34 is at in Fig. 2 In the embodiment shown, an overlapping arrangement with the stirring bars 36 results, ie MS - H <h. In such an arrangement, referred to as overlapping, the free end portions of the stirring rods 36 thus dip into the gaps existing between the axially spaced-apart rows of cams. An illustration of this condition is, albeit with different cam shape, in FIG. 10 shown.

Each cam 34 lies with its base or connecting surface F _cyl on the inside of the grinding container 28. For clarification is in Fig. 2 the connecting surface F _{cyl of} a cam 34 shown hatched. The greatest width of this connecting surface F _cyl is denoted by B, the largest length of the connecting length F _cyl contrast with L. In FIG. 2 For example, the width of the connection _surface F _Zyl over the entire length L of the connection _surface F _{cyl has} the value of the largest width B, but this may be different in other embodiments. For example, the largest width B may occur only at one point of the length extent of a cam 34, or only in a certain range. It is understood that due to the cylindrical curvature of Mahlbehälterinnenseite 28, the connection surface F _{cyl of} a cam 34 is also a cylindrically curved surface and that the length L and the distance A can be given in radians.

Further, each cam 34 has a frontal inflow surface 38, which in the in FIG. 2 shown cam 34 is steeper than a cam 34 opposite to the inflow surface 38 arranged, ramp-like flat inclined inflow surface 40. On Fig. 3 apparent inclination angle α of the frontal inflow surface 38 may be in a range of - 45 ° <α ≤ 85 ° with respect to a plane normal to Mahlbehälterinnenseite inside. An angle α = 0 ° corresponds to an inflow surface 38, which is normal to Mahlbehälterinnenseite 28. An angle α> 0 ° corresponds to a slope of the frontal inflow surface 38, as in FIG. 2 is shown and at a lower edge of the inflow surface 38, which is arranged on the inside of the grinding container 28, is first contacted by inflowing medium. On the other hand, an angle α <0 ° means that a radially upper edge of the frontal inflow surface 38 leads the previously described lower edge, ie such an inclined frontal inflow surface 38 leads to the formation of a cam 34 undercut on the upstream side.

If like in the FIG. 2 and 3 shown the frontal inflow surface 38 is steeper than the outflow surface 40, then this leads to the operation of the agitator mill 10 to increased deceleration of located in the vicinity of Mahlbehälterinnenseite 28 particles and Mahlhilfskörper, which in particular means that a concentration of Mahlhilfskörpern near the Mahlbehälterinnenseite 28 is avoided because by braking the Mahlhilfskörper these again radially inwardly passed into the grinding gap 32 and thus better mixed with the material to be crushed. However, depending on the grinding task to be solved, it can sometimes also be advantageous if the frontal inflow surface 38 is inclined at a shallower angle than the outflow surface 40.

Regardless of the other configuration of a cam 34, however, it holds for all the cams 34 that the ratio of the largest height h of each cam 34 and the inner diameter d of the grinding container is ≦ 0.05, ie. H. h / d ≤ 0.05. Likewise, for all cams 34, the ratio of the largest height h of each cam 34 and the mill gap width MS is ≦ 0.35, ie. H. h / MS ≤ 0.35.

It is also advantageous if, for all cams 34, the ratio of the greatest height h of each cam 34 and the greatest width B of the connection surface F _{cyl is} greater than 0.2, ie h / B> 0.2.

It is also advantageous if, for all cams 34, the ratio of the greatest height h of each cam 34 and the greatest length L of the connecting surface F _{cyl is} less than 1, ie h / L <1.

It is particularly advantageous if, for all cams 34, the ratio of the greatest width B and the greatest length L of the connection _surface F _{cyl is} less than 1, ie B / L <1.

Are like in FIG. 2 shown several cams 34 arranged along a circumferential line U successively, then advantageously the distance A between two each circumferentially consecutive cams 34 at least as large as the largest length L of a cam 34 and its connecting surface F _cyl .

Finally, as also in FIG. 2 shown, a plurality of cams 34 along a plurality of axially spaced-apart circumferential lines each arranged in a row, then is advantageously an axial distance a between each two axially adjacent cam rows at least 1.1 times the largest width B of a cam 34 and its Interface F _cyl .

As in FIG. 2 indicated by the angle β, the cams 34 need not necessarily extend along a circumferential line in length, but may be inclined relative to a circumferential line of Mahlbehälterinnenseite 28 at an angle β, said angle β preferably in a range of - 22.5 ° ≤ β ≤ 22.5 °.

In all embodiments of the agitating mill 10 according to the present invention, the one-piece container tube 14 is preferably made of silicon carbide or of silicon carbide with free silicon, wherein the cams 34 are advantageously made of the same material.

In the FIGS. 4 to 8 various embodiments of cam 34 are shown, which are attached to the Mahlbehälterinnenseite 28.

FIG. 4 shows cams 34a similar to those in FIG FIG. 2 However, in the cam 34a, the frontal face 38a is exactly normal to Mahlbehälterinnenseite 28 and the largest height h is significantly lower, so that the end portions of the stirring rods 36 do not dive into the existing gaps between the cam rows, ie it applies MS - H> h. This condition is in FIG. 9 clarified.

FIG. 5 shows cam 34b having a shape similar to cam 34 FIG. 2 However, in the cams 34b, the frontal inflow surface 38b has a scoop-like curved shape.

FIG. 6 shows cams 34c whose height h is constant over the entire length L (neglecting the differences in height resulting from the curved connecting _surface F _cyl ). Both the frontal inflow surface 38c and the outflow surface 40c are arranged at an angle of α = 0 ° to the interior of the grinding container 28, However, are not perpendicular to the respective circumferential line, but are inclined at an angle γ to this, wherein the inflow surface 38c inclined at the same angle γ, but opposite to the discharge surface 40c. Due to the overall lower height h, the in FIG. 6 shown cam assembly not with the stirring bars 36th

FIG. 7 shows cam 34d with a similar FIG. 2 slightly inclined frontal inflow surface 38d, however, in contrast to FIG. 2 wedge-shaped tapered runs. The rear outflow surface 40d, however, is rounded and has a slope which corresponds in magnitude about the front leading surface 38d. Because of the greater height h, this is a cam arrangement overlapping with the stirring bars 36. As shown, in this embodiment, the cams 34d are all inclined at the same angle β with respect to a circumferential line U of the inside of the grinding container 28.

FIG. 8 Finally, cam 34e shows one with the cam FIG. 7 corresponding form, however, unlike FIG. 7 are arranged vice versa, ie the rounded end face of the cam is here the inflow surface 38e and the wedge-like tapered end face of the cam is the outflow surface 40e. In the further difference to FIG. 7 For example, all of the cams 34e are arranged along a circumferential line and not obliquely therewith.

FIG. 9 shows by means of a cam 34a FIG. 4 and a stirring bar 36 a non-overlapping arrangement of cams and Rührstäben, ie the stirring rods 36 dive into the existing between the cam rows gaps due to the small height h of the cam.

FIG. 10 whereas, on the basis of a cam 34d shows FIG. 7 and a stirring bar 36 an overlapping arrangement of cams and stirrers, ie, the height h of the cams is so large that in the lateral projection view of the FIG. 10 the free end of the stirring bar 36 overlaps with the cam 34d, which means that during operation of the agitator mill, the stirring bars 36 dive into the gaps existing between the axially spaced rows of cams.

Claims (10)

Agitator ball mill (10), with a grinding container (12) whose inside (28) consists of a ceramic material, the grinding container (12) extending along an axis (X) and having an internal diameter (d), - One within the grinding container (12) arranged around the axis (X) rotatably driven rotor (20) facing the inside of the grinding container (12) surface (30), wherein between the surface (30) of the rotor (20) and the inside of the grinding container (12) has a grinding gap (32) with a grinding gap width (MS), a plurality of cams (34) mounted on the inside (28) of the grinding container (12) and extending radially inwardly from the inside of the grinding container at a height (h) normal to the inside of the grinding container, characterized in that - The inside of the grinding container (12) is formed by a one-piece container tube (14) made of ceramic material, the ratio between the height (h) of each cam (34) and the inside diameter (d) of the grinding container (12) is ≤ 0.05, and - The ratio of the height (h) of each cam (34) and the Mahlspaltweite (MS) ≤ 0.35. Agitator ball mill according to claim 1,
characterized in that the container tube (14) and the cams (34) made of silicon carbide (SiC) or silicon carbide with free silicon (SiSiC) consists. Agitator ball mill according to claim 1 or 2,
characterized in that each cam (34) has a joining surface (F _cyl ) to the grinding container inner side (28) having a largest width (B), and the ratio of the height (h) of each cam (34) and the largest width (B) is larger than 0.2. Agitator ball mill according to one of claims 1 to 3,
characterized in that each cam (34) has a joining surface (F _cyl ) to the grinding container inner side (28) having a largest length (L), and the ratio of the height (h) of each cam (34) and the largest length (L) is smaller than 1. Agitator ball mill according to one of the preceding claims,
characterized in that each cam (34) has a joining surface (F _cyl ) to the inside of the grinding container (28) having a maximum length (L) and a maximum width (B), the ratio of the largest width (B) and the largest length (L) is less than 1. Agitator ball mill according to one of the preceding claims,
characterized in that each cam (34) has a connection surface (F _cyl ) to Mahlbehälterinnenseite (28) and a frontal inflow surface (38), wherein a ratio of a projection (F _u ) of the frontal inflow surface (38) on a normal to Mahlbehälterinnenseite standing plane and the connecting _surface (F _Zyl ) is less than 1. Agitator ball mill according to claim 6,
characterized in that an angle of inclination (α) of the frontal inflow surface (38) with respect to the plane normal to Mahlbehälterinnenseite in a range of -45 ° <α ≤ 85 °. Agitator ball mill according to one of claims 4 to 7,
characterized in that in the circumferential direction of Mahlbehälterinnenseite more cams (34) in a row along a circumferential line are arranged successively and a distance (A) between circumferentially successive cams (34) ≥ the largest length (L) of a cam (34). Agitator ball mill according to one of claims 3 to 8,
characterized in that a plurality of cams (34) are arranged successively along a plurality of circumferentially spaced apart axial lines (X), each in a row, and in that an axial distance (a) between each two axially adjacent rows of cams is greater than or equal to 1,1- times the largest width (B) of a cam (34). Agitator ball mill according to claim 8 or 9, characterized
characterized in that some or all of the cams (34) are arranged at an angle (β) to the associated circumferential line when viewed in plan, the angle (β) preferably being in a range of -22.5 ° ≤ β ≤ 22.5 ° lies.

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