The invention relates to an agitator mill with a horizontally arranged grinding container having a cylindrical inner wall, arranged having a grinding container, about a common central longitudinal axis in a drive direction of rotation can be driven stirring shaft with a limited by the inner wall and the agitator shaft grinding chamber, wherein at a first end of the grinding chamber, a grinding stock inlet opens into this,

wherein a first end of the grinding container opposite second end of the grinding container a grinding material opens the outlet, wherein the stirrer shaft a adjacent to the grinding stock inlet, a first grinding chamber area delimiting first agitator shaft section of smaller diameter D24 and an outlet to the grinding material adjacent a second grinding chamber region bounding the second agitator shaft portion of larger diameter D25, where: D25> D24, said second agitator shaft portion has a cavity which is closed by a bottom opposite the first agitator shaft portion and in which a connected to the grinding-stock outlet, ending at a distance from the ground wire is arranged, and

wherein the second agitator shaft portion has the cavity with the second grinding chamber region connecting slots.

In such from DE 100 64 828 B4 known agitator mill, the part of a separator-forming longitudinal slits in the second agitator shaft portion slightly into the first section of smaller diameter agitator shaft extending into it. They end up forming sieve approximately in a radial plane with the part of the separator. The ground material flows through the grinding container from the grinding stock inlet to the opposite end of the grinding chamber, and then enters into the cavity within the second agitator shaft portion together with the entrained auxiliary grinding bodies from the Mahlgutströmung. Since the cavity is substantially cylindrical in shape, the CUT-th through the slots in the webs end-side region of the stirring shaft is greater than in the region of the cover of the wire. In the entry region of the cavity, therefore, an enhanced as removing auxiliary grinding bodies and coarse grinding material particles takes place. This is to be reinforced from the separator back into the grinding chamber, the radial Mahlhilfskörperströmung.

From DE 10 11 762 AI, 2013 1 one of the above-described known agitator mill similar agitator mill is known in which the agitator shaft has a constant profile over its full length. In the area between the grinding stock inlet and the separating means extending recesses are formed in the longitudinal direction of the agitator shaft that open into the slots which surround the second portion of the cavity agitator shaft with the sieve. The purpose of the radius to a respective symmetrical recesses is to promote the auxiliary grinding bodies directly into the slits of the separator, so that a ver-strengthened recirculation takes place in the grinding chamber. A sufficiently uniform and verpressungsfreie distribution of the grinding media in the grinding chamber is not reached by these known measures.

The invention is therefore based on the object to form an agitator mill according to the preamble of claim 1 so that a substantially uniform distribution of the auxiliary grinding bodies in the grinding chamber while avoiding compressions is reached.

This object is inventively achieved in that the first agitating shaft portion has at least one cavity penetrating the bottom of the first grinding chamber area connected with the cavity short channel.

that a largely free of auxiliary grinding ground material is conveyed directly in short-circuit in the separation device, ie directly in front of the screen by the inventive measures it is achieved. There fine grinding material particles are discharged directly through the grinding-stock outlet. A portion of the already sufficiently fine ground material is thus subjected to a grinding process only in the first Mahlraumbereich.

When according to an advantageous development of the invention the at least one formed in the first agitator shaft portion short-channel in the direction of the central longitudinal axis over 10 to 100%, or at least 70%, or at least 80%, beziehungseise at least 90% of the length L24 of the first agitator shaft portion extends, then, can be achieved that the signal supplied in the short circuit of the separator material to be ground is already freed to the desired degree of auxiliary grinding bodies and grinding material coarse particles. This effect is achieved in a particularly pronounced manner if the at least one short channel has an internal diameter D39 that is smaller than the inner diameter D27 of the cavity.

This effect is enhanced according to a further advantageous development of the present invention, when the at least one short-circuit channel is radially employed outwards counter to the driving direction of rotation, since the centrifugal effect is enhanced by this configuration of the short circuit-channels accordingly stronger to the auxiliary grinding bodies and coarse grinding material particles impact.

Further advantageous developments result from further Unteran sayings.

Further features, details and advantages of the invention will become apparent from the following description of embodiments of the invention with reference to the drawings. It shows

Figure 1 is a horizontal agitator mill, in vertical longitudinal section;

2 shows the grinding vessel of the agitator mill, in vertical

In longitudinal section with respect to Figure 1 on an enlarged scale,

3 shows a cross section through the grinding container according to the

Section line III-III in Figure 2,

4 shows a cross section through the grinding container according to the

Section line IV-IV in Figure 2,

5 shows a relative to Figure 2 modified embodiment of a grinding container in vertical longitudinal section;

6 shows a cross section through the grinding container according to the

Section line VI-VI in Figure 5,

7 shows a cross section through the grinding container along the section line VII-VII in Figure 5,

Figure 8 is a comparison with FIG 5 modified embodiment of a grinding container in vertical longitudinal section;

9 shows a cross section through the grinding container according to the

Section line IX-IX in figure 8, and

10 shows a cross section through the grinding container according to the

Section line XX in FIG. 8

As shown in FIG. 1 is removed, has a horizontal agitator mill on a machine frame 1 which is supported on the base 2. In the lower loading area of ​​the machine frame 1, a drive motor 3 is arranged, which is coupled to a drive shaft 5 by means of a belt drive. 4

In the upper region of the machine frame 1, a horizontal grinding container 6 is attached thereto. This has a first grinding container lid 7, which is mounted on the machine frame 1 and in which the drive shaft is rotatably supported by bearings 8. 5 The grinding container 6 further comprises a cylindrical inner wall 9, which is surrounded by a tempering-rier-shell 10, is inserted into the temperature control medium, usually cooling means through an inlet 11 and discharged through a drain 12th At the first grinding container lid 7 opposite end, thus at a distance to the upper region of the machine frame 1 of the grinding container is closed by a second grinding container lid 13. 6 The connection between each of the inner wall 9 is carried along with tempering jacket 10 with the first cover 7 and the second lid 13

16 by means of flanges 14, 15 and associated fittings through the inner cylindrical wall 9 and the first cap 7 and the second lid 13, a grinding chamber 17 is delimited, in the opens a trained in the first cover 7 grinding stock inlet 18 and from which a in the second lid 13 arranged regrind outlet 19 opens. Into the grinding chamber 17 continues to open up a auxiliary-grinding-A filler neck 20 and an outlet pipe 21 from Mahlhilfskörper-, both of which are also formed on the second lid. 13

In the grinding chamber 17 is an agitator shaft 22 is arranged to rotate with the drive shaft 5 is connected, and from the latter about a common horizontal central longitudinal axis 23 of drive shaft 5, the grinding chamber 17 and agitator 22 can be driven. The agitator shaft 22 is not mounted in the grinding chamber 17; it is therefore stored for your coupling to the drive shaft 5 on the fly. The agitator shaft 22 that is then comprises two sections, to the grinding stock inlet 18 a first agitator shaft portion 24 with an outer diameter D24, and thereafter a second agitator shaft portion 25 having an outer diameter D25 on. The following applies:

D25> D24. A transition portion 26 between the first agitator shaft portion 24 of smaller diameter D24 and the second agitator shaft portion 25 of larger diameter D25 is assigned to the first agitator shaft portion 24th

The first agitator shaft portion 24 is substantially designed as a solid-material portion, while the second agitator shaft portion 25 has an open to the second cover 13 toward cavity 27th The length L27 of the cavity 27 toward the first agitator shaft portion 24 out is less than the length L25 of the second agitator shaft portion 25. Thus: L27 = 0.1 L24.

As the respect to the embodiment of the Short channels modified embodiment can be removed by the figures 5 to 7, the shorting channels 39 may 'be the first agitator shaft portion extending over a substantial part of the length L24 24 and that in the limiting case the full length thereof in which the shorting channels 39 'are then axially to the first grinding container lid 7 open. Then:

L24> = L39 '> = 0.1 L24. In other words, this means that the axial length L39 'in the range of 10% to 100% of the length L24 is the first agitator shaft portion 24th Preferably, the shorting channels 39 'are relatively long. So '> = 0.7 L24 and L39' for them is considered preferable L39> = 0.8 L24 and L39 '> = 0.9 L24.

As is apparent from the drawing, the short channels 39, 39 'are in the same way as the longitudinal slots 28 - as seen from the central longitudinal axis 23 to the outside - against the direction of rotation employed 29th so they open out axially into the longitudinal slots 28th Furthermore have the short-circuit passages 39, 39 '- at least in the transition area 26 - an inner diameter D39, D39', which is smaller than the inner diameter D27 of the cavity 27 so that the short-circuit passages 39, 39 'directly through the bottom 41 of the cavity 27 opening into this. The inner diameter D39, D39 'is slightly larger than the outer diameter D33 of the Ab-cover 33 of the screen 32nd

The embodiment of Figures 8 to 10 differs from that according to the figures 5 to 7 only in that the inner diameter D39 ", the shorting channels 39 'is smaller than the outer diameter D33 of the cover 33 of the screen 32. This can of course also at the embodiment of the case according to figures 1 to. 4

The operation is as follows:

The grinding chamber 17, so the free space located between the inner wall 9 and the agitator 22 is filled to about 90% with only indicated auxiliary grinding bodies 42nd The diameter D42 of the grinding media 42 is in the range of 0.03 mm to 0.8 mm and preferably in the range of 0.03 mm to 0.4 mm. To be milled or ground material to be dispersed is pumped through the grinding stock inlet 18 into the grinding vessel 6 and

flows under intense stress caused by the stirring members 35, 36 and the auxiliary grinding bodies 42 the grinding chamber different 17 in Durchström- direction 40, wherein the average flow velocity in the first grinding chamber region 37 is lower than in the second grinding chamber region 38, because of the large free cross-sections of these grinding chamber regions 37, 38th

As shown in Figure 2 is removed, a part of the ground material flows according to the flow arrow 43 through the short channels 39 directly into the cavity 27 and leaves the grinding chamber 17 through the screen 32, as far as this ground material has a fineness, passing it through the sieve 32 leaves. The non-discharged through the screen 32 ground material is centrifuged off through the longitudinal slots 28 in the second grinding chamber area 38th Another part of the material for grinding is conveyed under further intensive Beaufschla-supply by the grinding media 42 by the second grinding chamber region 38 and flows around the end ring 30 around in the cavity 27 between the screen 32 and the second agitator shaft portion 25, where the auxiliary grinding bodies 42 and coarse grinding material stronger than fine ground material particles corresponding to the outward flow arrows are thrown off 45 through the longitudinal slots 28 in the second grinding chamber area 38th

Due to the relatively lower flow velocity of the material for grinding in the first grinding chamber region 37 compared to the second grinding chamber region 38, the risk of compression and injection of auxiliary grinding bodies 42 in the first grinding chamber region 37 is less than in the second grinding chamber area 38. Due to the fact that by the short-circuit passages 39 already a part of the ground material is supplied directly from the first grinding chamber region 37 of the separation device 31, the grinding material is

Flow rate is reduced in the second grinding chamber region 38 so that there is a risk of pressings of the auxiliary grinding bodies is reduced 42nd

If - as in the embodiments according to the figures 5 to 7 and 8 to 10 - extending the short-circuit passages 39 ', 39 "over a greater length L39', L39 'in the direction of the grinding stock inlet 18, then thereby the millbase - stream which is fed in the short-circuit directly to the separation device 31 is increased in comparison with the embodiment according to figures 1 to 4, as a result of the described embodiment of the shorting channels 39 ', 39 "auxiliary grinding bodies 42 and coarse grinding material particles pronounced than fine grinding material particles are "thrown off radially according to the illustrated arrows 46 from the shorting channels 39 in the first grinding chamber area 37th This is particularly true for the embodiment according to FIGS. 8 to 10.

Through the measures described the risk of pressings of auxiliary grinding bodies 42 is greatly reduced, so that a substantial increase in throughput is possible. In particular, the so-called passages operation, this has considerable advantages; this ground material is conveyed repeatedly circulated through the milling 6th

LIST OF REFERENCE NUMBERS

1 machine frame

2 floor

3 drive motor

4 belt drive

5 drive shaft

6 Mahlbehälter

7, first grinding container lid

8 bearings

9 inner wall

10 tempering jacket

11 feed

12 sequence

13 second grinding container lid

14 flange

15 flange

16 screw

17 grinding chamber

18 Grist inlet

19 Grist outlet

20 auxiliary-grinding-filling spigot

21 auxiliary-grinding-outlet pipe

22 agitator shaft

23 central longitudinal axis

24 first agitator shaft portion

25 second agitator shaft portion

26 transition portion (24-25)

27 cavity

Longitudinal slots

direction of rotation

End-Ring

separator

screen

, 33 'cover

base

Stirring elements

Stirring elements first grinding chamber region of the second grinding chamber section, 39 ', 39 "short circuit anal

flow direction

The bottom (27)

auxiliary grinding

Flow arrow

Direction arrow

Flow arrow

Direction arrow
claims

1. agitating mill

with a horizontally arranged grinding container (6) which see a cylindrical having inner wall (9),

arranged having a grinding container (6) to a common co-tel longitudinal axis (23) in a driving direction of rotation (29) drivable stirring shaft (22),

with one of the inner wall (9) and the agitator shaft (22) delimited by the grinding chamber (17),

wherein at a first end of the grinding chamber (17) opens a grinding stock inlet (18) in these,

wherein a first end of the grinding receptacle (6) opposite second end of the grinding container (6) opens out a grinding material outlet (19),

wherein the agitator shaft (22) comprises the grinding stock inlet (18) adjacent a first grinding chamber region (37) delimiting first agitator shaft portion (24) of smaller diameter D24 and the grinding material outlet (19) adjacent a second grinding chamber area limiting (38) the second agitator shaft portion (25) of larger

having diameter D25, where: D25> D24,

wherein the second agitator shaft portion (25) having a cavity (27) which is by a bottom (41) opposite the first agitator shaft portion (24) and finished in the connected one with the grinding material outlet (19) at a distance in front of the bottom (41) ending

Sieve (32) is arranged, and

wherein the second agitator shaft portion (25) the cavity (27) with the second grinding chamber region (38) has connecting slots (28),

characterized,

that the first agitator shaft portion (24) at least penetrating a soil (41) of the cavity (27), the first grinding chamber region (37) with the cavity (27) connecting the short-circuit channel (39, 39 ', 39 ") having.

Agitator mill according to claim 1, characterized in that the at least one short-circuit channel (39, 39 ', 39 ") has an inner diameter D39, D39', D39" which is smaller than the in-NEN-diameter D27 of the cavity (7 ).

Agitator mill according to claim 1 or 2, characterized in that the at least one first agitator shaft portion (24) formed short channel (39, 39 ', 39 ") in the direction of the central longitudinal axis (23) about 10 to 100% of the length L24 of the first agitator shaft portion (24).

Agitator mill according to any one of claims 1 to 3, characterized in that

the at least one short-circuit channel (39, 39 ', 39 ") radially outwardly in opposition to the driving direction of rotation (29) is employed.

Agitator mill according to any one of claims 1 to 4, characterized in that

the at least one short-circuit channel (39, 39 ', 39 ") parallel to the central longitudinal axis (23).

6. An agitator mill according to one of claims 1 to 5, characterized in that

the at least one short-circuit channel (39, 39 ', 39 ") partially in a slot (28) of the second agitator shaft Ab-section (25) passes.

7. An agitator mill according to one of claims 1 to 6, characterized in that

that a transition portion (26) is formed between the first agitator shaft portion (24) and the second agitator shaft portion (25), and that the short-circuit channel (39, 39 ', 39 ") at least partially in this transition portion (26) is formed.

8. An agitator mill according to claim 3, characterized in that

the at least one agitator shaft on the first portion (24) short-trained channel (39 ', 39 ") in the direction of the central longitudinal axis (23) over at least 70% of the length L24 of the first agitator shaft portion ( 24).

9. An agitator mill according to claim 3, characterized in that

the at least one first agitator shaft portion (24) formed short-circuit channel (39 ', 39 ") in the direction of the central longitudinal axis (23) over at least 80% of the length L24 of the first agitator shaft portion (24) extends.

10. An agitator mill according to claim 3, characterized in that

the at least one agitator shaft on the first portion (24) formed short-circuit channel (39 ', 39 ") in the direction of the central longitudinal axis (23) over at least 90% of the length L24 of the first agitator shaft portion (24) extends.