METHOD FOR IMPROVING THE PRODUCTIVITY OF GRINDING PLANTS

Abstract

The present invention relates to a method for improving the productivity of grinding plants, wherein, after the optimum wear geometry of the grinding units has been reached by conventional operation of the grinding plant, the optimum wear geometry is preserved by applying a thin wear protection layer to the surface of the grinding units.

Claims

1. A method for improving the productivity of grinding plants, the method comprising the steps of: reaching the optimum wear geometry of the grinding units by conventional operation of the grinding plant, the optimum wear geometry being present when the specific energy requirement of the grinding plant reaches a minimum at a prespecified throughput, and preserving the optimal wear geometry, wherein the energy requirement is continuously measured and recorded during the grinding method to verify when the optimal wear geometry is reached, and the optimal wear geometry is preserved by applying a thin wear protection layer (9) to the surface of the grinding units (1, 2).

2. The method according to claim 1, wherein the thin wear protection layer (9) is applied by means of buildup welding.

3. The method according to claim 1, wherein the material for the wear protection layer (9) is selected from the group comprising hard metal, WC, CrC, TiC, VC, TaC and NbC.

4. The method according to claim 1, wherein a hard metal layer is applied as a thin wear protection layer (9).

5. The method according to claim 1, wherein the grinding plant is a vertical roller grinding plant, and the grinding units or grinding elements to be coated are grinding rollers (1) and grinding plates (2).

6. The method according to claim 1, wherein the layer thickness of the thin wear protection layer (9) is 1 to 5 mm.

7. Grinding elements having grinding surfaces which are coated with a thin wear protection layer (9), wherein the grinding elements have an optimal wear geometry, wherein the optimal wear geometry of the grinding elements (1, 2) is determined by continuous measurement and recording of the energy requirement during the grinding process, and is defined as the geometry for which a minimum of the energy requirement is reached at a prespecified throughput.

8. The grinding elements according to claim 7, wherein the wear protection layer (9) is a buildup-welded layer.

9. The grinding elements according to claim 7, wherein the grinding elements are part of a vertical roller grinding plant, and the coated surfaces are the grinding surfaces of grinding rollers (1) and grinding plates (2).

10. The grinding elements according to claim 7, wherein the layer thickness of the thin wear protection layer (9) is 1 to 5 mm.

11. The method according to claim 2, wherein the material for the wear protection layer (9) is selected from the group comprising hard metal, WC, CrC, TiC, VC, TaC and NbC.

12. The method according to claim 2, wherein a hard metal layer is applied as a thin wear protection layer (9).

13. The method according to claim 3, wherein a hard metal layer is applied as a thin wear protection layer (9).

14. The method according to claim 2, wherein the grinding plant is a vertical roller grinding plant, and the grinding units or grinding elements to be coated are grinding rollers (1) and grinding plates (2).

15. The method according to claim 3, wherein the grinding plant is a vertical roller grinding plant, and the grinding units or grinding elements to be coated are grinding rollers (1) and grinding plates (2).

16. The method according to claim 2, wherein the layer thickness of the thin wear protection layer (9) is 1 to 5 mm.

17. The method according to claim 3, wherein the layer thickness of the thin wear protection layer (9) is 1 to 5 mm.

18. The grinding elements according to claim 8, wherein the grinding elements are part of a vertical roller grinding plant, and the coated surfaces are the grinding surfaces of grinding rollers (1) and grinding plates (2).

19. The grinding elements according to claim 8, wherein the layer thickness of the thin wear protection layer (9) is 1 to 5 mm.

20. The grinding elements according to claim 9, wherein the layer thickness of the thin wear protection layer (9) is 1 to 5 mm.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Preferred embodiments of the invention are described below with reference to drawings, these being intended only as an explanation and not to be interpreted as restrictive. In the drawings:

[0026] FIG. 1 is a sectional view of a detail of a vertical roller grinding plant,

[0027] FIG. 2 is a sectional view of a detail of a vertical roller grinding plant,

[0028] FIG. 3 is a sectional view of a detail of a roller of a vertical roller grinding plant, and

[0029] FIG. 4 is a further sectional view of a detail of a roller of a vertical roller grinding plant.

DESCRIPTION OF PREFERRED EMBODIMENTS

[0030] The invention is explained in detail below with reference to the drawings listed above.

[0031] FIG. 1 is a sectional illustration of a detail of a vertical roller grinding plant, as is used, for example, in the cement industry. A stationary, rotatable cylindrical grinding roller 1 is resiliently pressed against a rotatingly driven grinding table or grinding track 4, the grinding track 4 being reinforced with grinding plates 2 in the area against which the grinding rollers 1 are pressed. The grinding units or grinding elements (grinding rollers 1 and grinding plates 2) are in their original state and have a smooth, undamaged profile 5, 6.

[0032] FIG. 2 shows the same arrangement as FIG. 1 after longer grinding operation; the grinding rollers 1 and also the grinding plates 2 now have their typical wear profiles 7, 8.

[0033] In FIG. 3, a detail of a grinding roller 1 can be seen in a sectional view; the grinding roller 1 has reached its optimum wear profile 7. The original profile 5 is shown in dashed lines in this illustration.

[0034] Finally, FIG. 4 shows the grinding roller 1 in the same manner of representation as FIG. 3, wherein the optimal wear profile 7 thereof is now preserved with a thin wear protection layer 9, which in the present case is shown by dashed lines.

[0035] The grinding plates 2 have also reached an optimal wear profile, which is preserved in the same way with a thin wear protection layer. An additional graphic representation of the grinding plates 2, which have a comparable optimal wear profile as the grinding rollers 1, has been omitted at this point.

[0036] As already mentioned at the outset, the drawings described above are intended only as an explanation and are not to be seen as a restriction. Thus, the principle of the inventive idea can be applied to any other grinding plant in which an optimal wear geometry is also established on its wear parts during operation. The formation of the wear protection layer is also not limited to buildup welding; rather, it can be implemented using any other known technique. It is only necessary to ensure that the right time is selected for the preservation of the optimal wear geometry in order to fully exploit the advantages of the present invention.

[0037] As such, the present invention can advantageously also be combined with other known methods for increasing the wear resistance of grinding units and/or for securing reliable production. If, for example, as described in DE 203 21 584 U1, grinding rollers can be pivoted out while the system is in operation, virtually without stopping production, the optimal wear profiles can be preserved on the surfaces of the grinding rollers without causing a loss of production—and the repair interval for the system will be extended at the same time.

LIST OF REFERENCE SYMBOLS

[0038] 1 Grinding roller [0039] 2 Grinding plate [0040] 3 Grinding chamber [0041] 4 Grinding track [0042] 5 Original profile (grinding roller) [0043] 6 Original profile (grinding plate) [0044] 7 Wear profile (grinding roller) [0045] 8 Wear profile (grinding plate) [0046] 9 Wear protection layer