Apparatus for comminuting, grinding and dispersing flowable grinding stock

• US 6,565,023 B2
• Filed: 03/27/2001
• Issued: 05/20/2003
• Est. Priority Date: 03/28/2000
• Status: Expired due to Fees

• Current Assignee: Buhler GmbH
• Original Assignee: Draiswerke GmbH
• Inventors: Schmitt, Philipp
• Primary Examiner(s): Rosenbaum, Mark
• Application Number:
  US09/817,114
• Publication Number:
  US 20010028006A1
• Time in Patent Office: 784 Days
• Field of Search: 241/198.1, 241/199.5, 241/199.6, 241/199.7, 241/259.1, 241/261.1, 241/252, 241/257.1, 241/258, 241/117, 241/253, 241/36
• US Class Current: 241/36
• CPC Class Codes: B02C 15/16 with milling members essentially having different peripheral speeds and in the form of a hollow cylinder or cone and an internal roller or cone

Abstract

An apparatus for comminuting, grinding and dispersing flowable grinding stock has a grinding receptacle with an inner, first grinding surface, which is rotationally symmetrical relative to an axis of rotation, and is drivable to rotate about the axis of rotation. Also provided is a grinding roller, which has a second grinding surface that is rotationally symmetrical relative to a central longitudinal axis, and is drivable to rotate about the axis. A grinding gap is defined between the first grinding surface and the second grinding surface.

Claims

1. An apparatus for comminuting, grinding and dispersing pumpable grinding stock, comprising:

a stand (1);

a grinding receptacle (6),

which is rotatably seated on the stand (1),

which has a bottom (23);

which has an axis of rotation (22),

which has an interior (28) that is provided with an opening (25) that is open toward the top,

which is drivable by an electric drive motor (2) to rotate about the axis of rotation (22), and

which has an inner, first grinding surface (33),

which is rotationally symmetrical relative to the axis of rotation (22), and

which defines the interior (28) of the grinding receptacle (6);

a grinding roller (10),

which is rotatably seated on the stand (1),

which has a central longitudinal axis (16),

which is drivable to rotate about the central longitudinal axis (16), and

which has a second grinding surface (34),

which is rotationally symmetrical relative to the central longitudinal axis (16), and

which cooperates with the first grinding surface (33) to define a grinding gap (39) that has a width;

a grinding stock feed line (29) with a grinding stock pump (38) for the supply of pumpable grinding stock through the opening (25) into an open region between the bottom (23) and the grinding roller (10) to a fullness level (36) whereby the fullness level (36) is such that a majority of the grinding gap (39) is located above the fullness level (36) when the grinding receptacle (6) and the grinding roller (10) are inoperative;

a grinding stock discharge (30), which discharges from the opening (25);

a central control unit (37) for the electric drive motor (2); and

a sensor (35) for detecting the fullness level (36) of the grinding stock in the grinding receptacle (6) and for transmitting fullness level signals to the control unit (37) to vary a speed of at least one of the grinding receptacle (6) and the grinding roller (10).

2. The apparatus according to claim 1, wherein the grinding receptacle (6) and the grinding roller (10) are drivable to rotate in the same directions of rotation (41, 42).

3. The apparatus according to claim 1, wherein the grinding receptacle (6) and the grinding roller (10) are drivable to rotate by a common drive motor (2).

4. The apparatus according to claim 1, wherein at least one of the grinding receptacle (6) and the grading roller (10) are drivable to rotate by way of a gear (5).

5. The apparatus according to claim 4, wherein the gear (5) has an infinitely-variably-adjustable transmission.

6. The apparatus according to claim 1, wherein the width of the grinding gap (39) is 3 to 500 μ

m.

7. The apparatus according to claim 6, wherein the width of the grinding gap (39) is 5 to 50 μ

m.

8. The apparatus according to claim 1, wherein the width of the grinding gap (39) is adjustable.

9. The apparatus according to claim 8, wherein the width of the grinding gap (39) can be variably adjusted over its length b.

10. The apparatus according to claim 8, wherein at least one of the grinding receptacle (6) and the grinding roller (10) is seated on a bearing slide element (14) that is adjustable, relative to the stand (1), transversely to at least one of the axis of rotation (22) and the central longitudinal axis (16).

11. The apparatus according to claim 10, wherein the bearing slide element (14) is adjustable by at least one adjusting drive (21).

12. The apparatus according to claim 1, wherein the axis of rotation (22) and the central longitudinal axis (16) intersect at an angle a, to which the following applies:

0≦

a≦

45°

.

13. The apparatus according to claim 12, wherein the axis of rotation (22) and the central longitudinal axis (16) intersect at an angle a, to which the following applies:

10≦

a≦

30°

.

14. The apparatus according to claim 1, wherein the first grinding surface (33) is at least essentially frustoconical.

15. The apparatus according to claim 1, wherein the first grinding surface (33) is at least essentially cylindrical.

16. The apparatus according to claim 1, wherein the second grinding surface (34) is at least essentially cylindrical.

17. The apparatus according to claim 12, wherein the following applies to the diameter c of the second grinding surface (34) relative to the smallest diameter d of the first grinding surface (33):

c<

d×

cos a.

18. The apparatus according to claim 17, wherein 0.2 d×

cos a≦

c≦

0.9 d×

cos a applies.

19. The apparatus according to claim 9, wherein at least one of the grinding receptacle (6) and the grinding roller (10) is seated on a bearing slide element (14) that is adjustable, relative to the stand (1), transversely to at least one of the axis of rotation (22) and the central longitudinal axis (16).