Roller mill having rim elements and method for setting an end-face gap of the roller mill

Abstract

A milling roll of a roll mill may have a roll main body and an edge element that is attached to an end region of a roll end of the milling roll and extends in a radial direction beyond a surface of the roll main body. The edge element comprises a base flange and a spacer element that is attached thereto. Wear protection elements can be attached to the spacer element. Furthermore, a roll mill may have a first milling roll and a second milling roll that are arranged opposite one another and can be driven in opposite directions. A milling gap is disposed between the milling rolls, and an edge element on one of the milling rolls may extend over the milling gap and at least partially cover an end side of the opposite milling roll.

Claims

1. A milling roll of a roll mill, comprising: a roll main body having a milling face; and an edge element that is attached to an end region of the roll main body, wherein the edge element comprises: a base flange, a spacer element that is rigidly attached to the base flange, and wear protection elements that are attached to the spacer element, wherein the spacer element is disposed between the wear protection elements and the base flange, wherein the base flange, spacer element, and wear protection elements each extends in a radial direction beyond the milling face of the roll main body.

2. The milling roll of claim 1 wherein the wear protection elements are fastened releasably to the spacer element using releasable connecting elements.

3. The milling roll of claim 1 wherein the wear protection elements are plate-shaped.

4. The milling roll of claim 1 wherein the base flange is configured as a circularly annular plate.

5. The milling roll of claim 1 wherein the spacer element is configured as a circularly annular plate.

6. The milling roll of claim 1 wherein the spacer element is a first spacer element and is configured as a partially circularly annular plate, wherein at least the first spacer element and a second spacer element are attached to the base flange.

7. The milling roll of claim 1 wherein the wear protection elements are attached releasably to the spacer element.

8. The milling roll of claim 1 wherein the base flange is connected releasably to the roll main body.

9. A roll mill comprising: a first milling roll and a second milling roll that are arranged opposite one another and are configured to be driven in opposite directions, wherein the first milling roll is the milling roll of claim 1; and a milling gap between the first and second milling rolls, wherein the edge element of the first milling roll extends over the milling gap and at least partially covers the second milling roll on an end side.

10. The roll mill of claim 9 wherein with respect to the first milling roll the spacer element is fastened releasably to the base flange.

11. The roll mill of claim 9 wherein with respect to the first milling roll the spacer element is plate-shaped.

12. The roll mill of claim 9 wherein with respect to the first milling roll the base flange is configured as a circularly annular plate.

13. The roll mill of claim 9 wherein with respect to the first milling roll the spacer element is configured as a circularly annular plate.

14. The roll mill of claim 9 wherein with respect to the first milling roll the spacer element is a first spacer element and is configured as a partially circularly annular plate, wherein at least the first spacer element and a second spacer element are attached to the base flange.

15. The roll mill of claim 9 wherein with respect to the first milling roll the wear protection elements are attached releasably to the spacer element.

16. The roll mill of claim 9 wherein with respect to the first milling roll the base flange is connected releasably to the roll main body.

17. A method for setting an end-side gap of a roll mill with a first milling roll and a second milling roll that are arranged opposite one another and are configured to be driven in opposite directions, each of the first milling roll and the second milling roll having a cylindrical roll main body with a milling face, wherein a milling gap is disposed between the first and second milling rolls, wherein at each end of the milling gap an end region of one of the milling rolls has an edge element that is configured to extend over the milling gap and at least partially cover an end side of the opposing milling roll, thereby forming the end-side gap between the edge element and the end side of the respective opposite milling roll, with the edge element having a base flange, the method comprising: rigidly attaching a spacer element to the base flange; and attaching wear protection elements to the spacer element; wherein the spacer element is disposed between the wear protection elements and the base flange; wherein the spacer element and wear protection elements extend radially beyond the milling face of its respective milling roll.

18. The method of claim 17 comprising fastening the spacer element and the wear protection elements releasably.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) In the following text, the present disclosure is described in greater detail on the basis of a plurality of exemplary embodiments with reference to the appended figures,

(2) FIG. 1 is a diagrammatic view of an example roll mill with two milling rolls that in each case have an edge element.

(3) FIG. 2 is a diagrammatic view of another example roll mill, that is, a roll mill having two edge elements,

(4) FIG. 3 is a diagrammatic view of still another example milling roll with two edge elements in a perspective view and a top view.

DETAILED DESCRIPTION

(5) Although certain example methods and apparatus have been described herein, the scope of coverage of this patent is not limited thereto. On the contrary, this patent covers all methods, apparatus, and articles of manufacture fairly falling within the scope of the appended claims either literally or under the doctrine of equivalents. Moreover, those having ordinary skill in the art will understand that reciting a element or an element in the appended claims does not restrict those claims to articles, apparatuses, systems, methods, or the like having only one of that element, even where other elements in the same claim or different claims are preceded by at least one or similar language. Similarly, it should be understood that the steps of any method claims need not necessarily be performed in the order in which they are recited, unless so required by the context of the claims. In addition, all references to one skilled in the art shall be understood to refer to one having ordinary skill in the art.

(6) FIG. 1 shows a roll mill 10 with a first milling roll 12 and a second milling roll 14 which in each case have a substantially cylindrical roll main body. The milling rolls 12, 14 are arranged so as to lie opposite one another, and can be driven in opposite directions. A milling gap 16 which extends in the axial direction is configured between the milling rolls 12, 14. The milling rolls 12, 14 are arranged parallel to one another, with the result that the milling gap 16 which extends between the milling rolls 12, 14 has a constant width. Furthermore, each of the milling rolls 12, 14 has a drive shaft 30, 32 which extends along the center axis through the respective milling roll 12, 14 and drives the milling rolls such that they rotate about the center axis thereof. The first and the second milling roll 12, 14 have the same diameter and the same length, and are of substantially structurally identical configuration.

(7) The milling rolls 12, 14 in each case have a first end region 24, 28 and a second end region 22, 26 which are arranged at opposite ends of the milling roll. The first end region 24 of the first milling roll 12 is arranged so as to lie opposite the first end region 28 of the second milling roll 14, the second end region 22 of the first milling roll 12 being arranged so as to lie opposite the second end region 26 of the second milling roll 14.

(8) Furthermore, the roll mill 10 has a first edge element 18 and a second edge element 20, in each case one edge element 18, 20 being arranged on each milling roll 12, 14. The edge elements 18, 20 are arranged so as to lie diagonally opposite one another in relation to the end regions 22 to 28 of the milling rolls 12, 14. On its first end region 24, the first milling roll 12 has an edge element 18 which extends in the radial direction over the milling gap 16 and covers the end side of the second milling roll 14 on the first end region 28 partially. On its second end region 26, the second milling roll 14 has an edge element 20 which extends in the radial direction over the milling gap 16 and covers the end side of the first milling roll 12 on its second edge region 22 partially. The second edge element 20 is arranged on the diagonally opposite end region 26 of the second milling roll 14 in relation to the first edge element 18. The milling rolls 12, 14 are arranged offset in the axial direction, with the result that a first end-side gap 34 is configured between the first edge element 18 and the end side of the second milling roll 14 and a second end-side gap 36 is configured between the second edge element 20 and the end side of the first milling roll 12. The first and the second end-side gap 34, 36 extend in each case in the radial direction.

(9) Each milling roll 12, 14 comprises a preferably cylindrical roll main body 11, 13 which has a milling face which is formed by way of the cylindrical surface of the roll main body. The edge elements 18, 20 comprise, for example, in each case one circumferential circular ring which is attached to the respective milling roll 12, 14 in a way which is not shown. For example, the edge elements 18, 20 are attached to the end side or on the outer circumference of the milling roll, in particular the respective roll main body. For example, a circumferential groove is arranged on the outer circumference of the respective milling roll 12, 14, in which groove in each case one edge element 18, 20 is arranged. The edge elements 18, 20 are configured from a wear-resistant material, such as, for example, steel, and have, for example, a thickness of from 10 mm to 100 mm and cover the opposite milling rolls 12, 14 by approximately from 2 to 10%, in particular from 4 to 7%, preferably 5% of the roll diameter.

(10) FIG. 2 shows a roll mill 10 with a first milling roll 12 and a second milling roll 14 in accordance with the exemplary embodiment from FIG. 1. In contrast to FIG. 1, the first milling roll 12 has two edge elements 18, 20 which are attached in each case to an end region of the milling roll 12. The first edge element 18 is attached to the first edge region 22 of the first milling roll 12, and extends in a radial direction beyond the milling gap 16, with the result that it covers the end side of the second milling roll 14 on the first end region 26 partially. The second edge element 20 is attached to the second end region 24 of the first milling roll 12, and extends in the radial direction beyond the milling gap 16, with the result that it covers the end side of the second milling roll 14 on the second end region 28 partially. An end-side gap 34, 36 is configured in each case between the edge elements 18 and the respective end side of the second milling roll 14.

(11) FIG. 3 shows a milling roll, by way of example the first milling roll 12 of FIGS. 1 and 2, with two edge elements 18, 20. Each of the edge elements 18, 20 comprises a base flange 38 which, by way of example, is a circularly annular plate. The base flange 38 is preferably configured in one piece from, for example, steel, and is fastened to the roll main body of the milling roll 12, in particular is welded or is configured in one piece with the latter, in particular is cast. A spacer element 40 is attached to the base flange 38. The spacer element 40 is configured, for example, as a circularly annular plate. It is likewise conceivable that the spacer element 40 has a plurality of partially circularly annular segments 40 which preferably together result in a circular ring and are attached next to one another to the base flange. The spacer element 40 is preferably configured from steel, plastic, brass or copper. The spacer element 40 is attached to the base flange, for example, releasably by means of a non-positive and/or positively locking connecting means. For example, the spacer element 40 is fastened to the base flange 38 by means of one or a plurality of screws. The spacer element 40 is attached to the side face which points inward in the axial direction of the milling roll 12, and covers the latter completely, for example.

(12) A plurality of wear protection elements 42 are attached to the spacer element 40. The wear protection elements 42 are, for example, plate-shaped, and are configured from a wear-resistant material, such as, for example, tungsten carbide or ceramic. The wear protection elements 42 are preferably attached next to one another to the spacer element 40, with the result that that surface of the spacer element 40 which points inward in the axial direction of the milling roll 12 is preferably covered completely by one or a plurality of wear protection elements 42. The wear protection elements 42 are fastened to the spacer element 40, for example, by means of a releasable connecting means, such as screws or bolts.

(13) The milling roll 12 has by way of example an edge protection means 44 which preferably comprises a plurality of corner blocks which are attached to an end region of the milling roll, for example, in a circumferential groove. The edge protection means 44 preferably lies against the wear protection elements 42.

(14) A spacer element 40 makes simple setting of the end-side gap 34, 36 of the roll mill 10 possible, in particular without an axial displacement of the milling rolls 12, 14 with respect to one another. In order to set the end-side gap 34, 36, a spacer element 40 with a corresponding thickness is attached to the base flange 38. Subsequently, for example, the wear protection elements 42 are fastened to the spacer element 40. In order to achieve a further increase or decrease of the end-side gap 34, 36, an axial displacement of at least one of the milling rolls 12, 14 relative to the other milling roll 12, 14 is possible.

LIST OF DESIGNATIONS

(15) 10 Roll mill 11 Roll main body 12 First milling roll 13 Roll main body 14 Second milling roll 16 Milling gap 18 First edge element 20 Second edge element 22 Second end region of the first milling roll 24 First end region of the first milling roll 26 Second end region of the second milling roll 28 end region of the second milling roll 30 Drive shaft of the first milling roll 32 Drive shaft of the second milling roll 34 First end-side gap 36 Second end-side gap 38 Base flange 40 Spacer element 42 Wear protection element 44 Edge protection means