Separating device for a ball mill or agitator ball mill as well as a ball mill or agitator ball mill with a separating device

Abstract

A separating device for a ball mill or an agitator ball mill as well as a ball mill or agitator ball mill with a separating device, wherein the ball mill or agitator ball mill includes a cylindrical grinding container with a first end opening and a second end opening, wherein the first and second end openings can be closed by a first and a second closure device, wherein a ground stock inlet is arranged in the region of the second end opening and a ground stock outlet is arranged in the region of the first end opening and wherein the separating device is assigned to the ground stock outlet. The separating device includes a plurality of first and second screen segments with screen apertures, which are arranged in an alternating manner on a frame.

Claims

1. A ball mill or an agitator ball mill comprising: a separating device, wherein the ball mill or the agitator ball mill comprises a grinding stock inlet and a grinding stock outlet, wherein the separating device is configured to be disposed in and/or assigned to a region of the grinding stock outlet, wherein the separating device comprises a plurality of first and second sieve segments with sieve openings, which are disposed alternately on a frame, wherein a connecting means is assigned centrally to a short base side of the first sieve segments, and a locating means is assigned centrally in a region of or adjacent to a long base side of the first sieve segments, and wherein a locating means is assigned centrally in a region of or adjacent to a short base side of the second sieve segments, and a connecting means is assigned centrally to a long base side of the second sieve segments.

2. The ball mill or the agitator ball mill according to claim 1, wherein the arrangement of the first and second sieve segments on the frame constitutes a cylindrical shape of the separating device.

3. The ball mill or the agitator ball mill according to claim 2, wherein the first and second sieve segments each comprise a convexly curved outer lateral surface, wherein the first and second sieve segments are disposed on the frame in such a way that the outer surfaces of the totality of all the first and second sieve segments form a cylindrical shape with a circular base area.

4. The ball mill or the agitator ball mill according to claim 1, wherein the first and second sieve segments each comprise a convexly curved outer lateral surface, wherein the first and second sieve segments are disposed on the frame in such a way that the outer surfaces of the totality of all the first and second sieve segments form a cylindrical shape with a circular base area.

5. The ball mill or the agitator ball mill according to claim 1, wherein the first and second sieve segments each comprise trapezoidal areas.

6. The ball mill or the agitator ball mill according to claim 5, wherein the first and second sieve segments each comprise a coating.

7. The ball mill or the agitator ball mill according to claim 6, wherein the trapezoidal areas are constituted as sieve plates with first through-openings for the grinding stock and wherein the coating comprises second through-openings for the grinding stock, the second through-openings being disposed in alignment with the first through-openings of the trapezoidal areas.

8. The ball mill or the agitator ball mill according to claim 6, wherein the coating is deposited on the trapezoidal areas.

9. The ball mill or the agitator ball mill according to claim 8, wherein the trapezoidal areas are isosceles trapezoidal areas, wherein the coating has a maximum thickness (d.sub.max) in a region of an axis of symmetry (S) of the isosceles trapezoidal areas and a minimum thickness (d.sub.min) in a region of the sides of the isosceles trapezoidal area.

10. The ball mill or the agitator ball mill according to claim 9, wherein the coating forms a convex outwardly curved outer lateral surface with the maximum thickness (d.sub.max) in the region of the axis of symmetry (S) of the isosceles trapezoidal area.

11. The ball mill or the agitator ball mill according to claim 1, wherein the frame comprises two annular elements, which are connected to one another by transverse elements.

12. The ball mill or the agitator ball mill according to claim 11, wherein the first and second sieve segments comprise trapezoidal areas with identical areas and wherein a spacing (A) between the transverse elements of the frame corresponds to a mean value of lengths of base sides of the trapezoidal areas.

13. The separating device according to claim 1, wherein the frame comprises a first annular element and a second annular element which are connected to one another by transverse elements, wherein fastening sockets for the connecting means of the first and second sieve segments are assigned to the first annular element of the frame and wherein openings for fastening the first and second sieve segments are assigned to the second annular element of the frame.

14. The ball mill or the agitator ball mill according to claim 13, wherein the first and second sieve segments are configured to be fastened to the second annular element via fasteners engaging through the openings into each of the locating means of the first and second sieve segments.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) Examples of embodiment of the invention and its advantages are explained below in greater detail with the aid of the appended figures. The size ratios of the individual elements with respect to one another in the figures do not always correspond to the actual size ratios, since some forms are represented simplified and other forms are represented enlarged in relation to the other elements for the sake of better illustration.

(2) FIG. 1 shows a diagrammatic longitudinal cross-section through an agitator ball mill.

(3) FIG. 2 shows a separating device according to the invention for a mill, in particular for a large agitator ball mill.

(4) FIGS. 3A-3G show different views and details of the frame of the separating device according to the invention.

(5) FIGS. 4A-4E show different views of first sieve segments.

(6) FIGS. 5A-5E show different views of second sieve segments.

(7) FIGS. 6A-6D show different views of the assembled separating device according to the invention fastened to a lid for the closure of the grinding container.

DETAILED DESCRIPTION OF THE INVENTION

(8) Identical reference numbers are used for identical or identically acting elements of the invention. Furthermore, for the sake of a clearer view, only reference numbers are represented in the individual figures that are required for the description of the respective figure. The represented embodiments only represent examples as to how the device according to the invention can be constituted and do not represent a conclusive limitation.

(9) FIG. 1 shows a diagrammatic longitudinal cross-section through an agitator ball mill 1 according to the prior art. The latter comprises a horizontally mounted grinding container 3, Furthermore, it can be seen that an outlet 7 for removing the grinding stock with separating system 8 is assigned to the one first end wall 10. The other second end wall 11 of grinding container 3 is constituted open and comprises a grinding container flange 12. Open end wall 11 of grinding container 3 is closed with a lid 13 with lid flange 13*. Sealing elements are disposed on lid 13 on the container side for the purpose of a sealed fastening. Grinding stock inlet 4 is also assigned to lid 13, via which grinding stock 5 is introduced into grinding container 3, Grinding container 3 is filled with grinding balls 6 and also comprises agitator elements 14, which ensure the intensive motion of grinding balls 6, while for example a grinding stock suspension 5* is continuously pumped through the grinding chamber of grinding container 3. Agitator elements 14 are disposed for example on a common drive shaft 15, which is driven by a suitable drive means 16. Drive means 16 is for example an electric motor 17 and is disposed on the outer side of lid 13.

(10) FIG. 2 shows a separating device 20 according to the invention for a mill, in particular for a large agitator ball mill 1 (see FIG. 1). Separating device 20 is designed as a kind of sieve cylinder 21, wherein the size of sieve openings 50 is selected such that auxiliary grinding means 6 (see FIG. 1) are held back, while ground grinding stock 5, 5* can be removed from the mill or agitator ball mill 1 via grinding stock outlet 7 (see FIG. 1). Sieve cylinder 21 comprises a plurality of individual sieve segments 30, 40, the number whereof varies according to the size of the machine. Sieve segments 30, 40 can be arranged in a row in the form of a circle and disposed on a frame 60, so that together they form separating device 20 in the form of a cylinder with a circular base area.

(11) FIG. 3 show different views and details of frame 60 of separating device 20 according to the invention. In particular, FIG. 3A shows a perspective view and FIG. 3B a side view. Frame 60 comprises two annular frame elements 61-1 and 61-2, which are connected together by transverse elements 62. Transverse elements 62 each project at least in sections above the outer diameter of annular frame elements 61-1 and 61-2 and each form in this region projecting support faces 63. First annular frame element 61-1 comprises a fastening socket 70 for connecting elements of sieve segments 30, 40 in each case centrally between two transverse elements 62 and second annular frame element 61-2 comprises a fastening device 72 for connecting means of sieve segments 30, 40 in each case centrally between two transverse elements 62. Fastening sockets 70 and fastening devices 72 are each preferably disposed lying opposite one another. Transverse elements 62 are preferably disposed parallel with one another between the two annular frame elements 61-1 and 61-2.

(12) In the shown example of embodiment, the two annular frame elements 61-1, 61-2 are connected together by twelve uniformly spaced transverse elements 62, i.e. transverse elements 62 are each disposed offset with respect to one another at an angle of =30 along the circle circumference of annular frame elements 61-1, 61-2 or transverse elements 62 are disposed in each case with a spacing A from one another along the circle circumference of circular frame elements 61-1, 61-2.

(13) FIG. 3C shows a cross-sectional representation along intersecting line A-A represented in FIG. 3B in a plan view onto a first annular frame element 61-1 with fastening sockets 70, which are each disposed centrally between two adjacent transverse struts 62. FIG. 3D shows a plan view of second annular frame element 61-2 with fastening devices 72, which are each disposed centrally between two adjacent transverse struts 62. FIG. 3E to 3G in each case show a cross-sectional representation along intersecting line B-B, C-C and D-D represented in FIG. 3D.

(14) FIG. 4 show different views of first sieve segments 30 and FIG. 5 show different views of second sieve segments 40. In particular, FIGS. 4A, 5A each show a plan view of a sieve segment 30, 40, FIGS. 4B, 5B each show a side view of a sieve segment 30, 40; FIGS. 4C, 5C each show a cross-sectional representation along intersecting line A-A represented in FIG. 4A or 5A. FIGS. 4D, 4E, 5D, 5E each show different perspective representations of sieve segments 30, 40.

(15) Sieve segments 30, 40 comprise largely plane sieve plates 80 made of metal, in particular steel, or another suitable material. Sieve plates 80 each have the shape of an isosceles trapezoid.

(16) Sieve segments 30, 40 each comprise connecting means 82 and locating means 84. Connecting means 82 are constituted for example by bolts 83, locating means 84 being constituted for example as screw holes 85 or similar receiving points. According to the represented preferred embodiment, first short base side 31 of sieve plate 80-1 is constituted as the bolt side in the case of first sieve segments 30; in particular, connecting means 82 is assigned centrally to short base side 31 of sieve plate 80. Locating means 84 is also disposed centrally adjacent to long base side 32, in particular on mirror axis S between sides 33. Furthermore, long base side 32 of sieve plate 80-2 is constituted as the bolt side in the case of second sieve segments 40; in particular, connecting means 82 is assigned centrally to long base side 32 of sieve plate 80-2. Locating means 84 is also disposed centrally adjacent to short base side 31, in particular on mirror axis S between sides 33.

(17) Sieve segments 30, 40 comprise on one side coating 87 with an elastic material, in particular with rubber or suchlike. Coating 87 is preferably constituted in the radial direction at least for the most part in the form of a radius. When FIGS. 4C, 5C are viewed, it becomes clear the coating 87 has maximum thickness d.sub.max in the region of axis of symmetry S between the two trapezoidal sides 33, whilst coating 87 has minimum thickness d.sub.min in the region of sides 33. This means that, proceeding from axis of symmetry 5, coating 87 thus tapers in cross-section on both sides.

(18) Sieve plate 80 and coating 87 each comprise through-opening 81, 88. Through-openings 81, 88 are disposed such that in each case a first through-opening 81 of sieve plate 80 and a second through-opening 88 of coating 87 are aligned with one another and thus form a sieve opening 50.

(19) Particularly in FIGS. 4A, 4D, 4D and 5A, 5C and 5D, it can clearly be seen that coating 87 projects laterally beyond sides 33 of sieve plate 80 and constitutes a conical coating side 89.

(20) FIG. 6 show different views of assembled separating device 20 according to the invention fastened to a lid 90 for closing the grinding container.

(21) The represented separating device comprises six first and six second sieve segments 30, 40, which are disposed alternately on frame 60, wherein trapezoidal sides 33, 43 each lie on transverse elements 62 of frame 60 and preferably abut against one another. This means that the width of transverse elements 62 is selected such that trapezoidal sides 33, 43 of a first or second sieve segment 30, 40 disposed between two transverse elements 62 for the most part lie completely on transverse elements 62. Spacing A between two adjacent transverse elements 62 (see FIG. 3A) of frame 60 broadly corresponds to the mean value of the lengths of base sides 31, 32 and 41, 42 of the trapezoidal areas. Preferably, A= X (length of short base side+length of long base side).

(22) The commonly known outer cylindrical shape of ready-assembled separating device 20 is achieved by arranging in a row and fastening first and second sieve segments 30, 40 on frame 60 (see FIG. 3) with coating 87 facing outwards in each case.

(23) In particular, sieve segments 30, 40 are fastened to frame 60 in that sieve segments 30, 40 are inserted, with their connecting means 82 or bolts 83, into fastening sockets 70 of first annular frame element 61-1 of frame 60. On the opposite side, a separate bolt 75 or another suitable connecting means is pushed through fastening device 72 of second annular frame element 61-2 of frame 60 into the locating means of sieve plate 80 of sieve segment 30, 40. In particular, second sieve segments 40 are first disposed on frame 60, wherein space for a first sieve segment 30 is left free in each case between individual second sieve segments 40. First sieve segments 30 are then inserted into the free spaces and fastened to the frame and, by means of separate bolt 75, to fastening devices 72 of second annular frame element 61-2 of frame 60.

(24) On account of their respective trapezoidal shape, sieve segments 30, 40 are constituted conical in the axial direction of formed separating device cylinder 20. In particular, coating 87 projects uniformly beyond trapezoidal sides 33 of sieve plate 80, in order that sieve segments 30, 40 can be pressed against one another and a compression and therefore sealing results at the abutting edges or trapezoidal sides 33, 43 (see FIGS. 4 and 5).

(25) First sieve segments 30 inserted last can be pushed manually between adjacent second sieve segments 40 until conical coating sides 89 (see FIGS. 4 and 5) or trapezoidal sides 33 lie adjacent to one another. The axial displacement then still required is achieved by closing with the aid of a lid 90 for closing the grinding stock cylinder, so that all sieve segments 30, 40 lie flush against one another in the axial direction. Lid 90 is screwed onto frame 60 and lies over separately inserted bolts 75. It thus prevents loosening of sieve segments 30, 40.

(26) The invention has been described by reference to a preferred embodiment. A person skilled in the art can however imagine that modifications or changes to the invention can be made without thereby departing from the scope of protection of the following claims.