Press roll for a roll press

Abstract

The invention relates to a press roll (1) for a roll press, in particular for comminuting highly abrasive materials, comprising a roll body (2) which has a plurality of pocket-like recesses (3) that are distributed over the circumference and are spaced from one another in the circumferential direction (T) on one or both roll edges, each said recess being formed so as to be open laterally and at the top. Only one hard body is removably inserted into each individual pocket-like recess (3) as an exchangeable edge protection element (5), and the length (L) of the pocket-like recesses (3) and the length (I) of the inserted edge protection elements (5) in the circumferential direction (T) is greater than the distance (A) between two directly adjacent recesses (3).

Claims

1. A crush roller for a roller crusher for comminuting highly abrasive materials, comprising a roller body having a plurality of pockets that are distributed angularly and are spaced from one another in an angular direction on one or both roller end faces, each such pocket being open axially outward at a roller end face and radially outward at a cylindrical roller outer surface, a single hard body being inserted as a replaceable edge protector into each individual pocket, wherein the length of the pockets and the length of the inserted edge protectors in the angular direction at radial outer edges of the edge protectors are greater than five times the spacing between two directly adjacent pockets at the roller outer surface.

2. The crush roller according to claim 1, wherein the length of the pockets and the length of the edge protectors at the radial outer edges is more than ten times the spacing at the radial outer edges.

3. The crush roller according to claim 1, wherein the spacing between two directly adjacent pockets at the radial outer edges is more than 3 mm.

4. The crush roller according to claim 1, wherein the edge protectors are rectangular seen radially of the roll.

5. The crush roller according to claim 1, wherein the axial pockets have curved wall surfaces from an axial end view, at least in some areas, and the edge protectors have a curved outer surface that is complementary at least in some areas to the curved wall surface.

6. The crush roller according to claim 5, wherein the curved wall surfaces of the pockets or the curved outer surfaces of the edge protectors are arcuate, parabolic, or hyperbolic.

7. The crush roller according to claim 1, wherein each of the edge protectors has a support element with a wear layer carried thereon, the support element being made of a ductile material of lower hardness than the wear layer.

8. The crush roller according to claim 7, wherein the edge protectors or the wear layers thereof are made of hard metal or a hard metal-like material or a metal matrix composite.

9. The crush roller according to claim 7, wherein the wear layer is attached onto or on the support element by sintering or hot isostatic pressing.

10. The crush roller according to claim 1, wherein the support elements are made of steel.

11. The crush roller according to claim 1, wherein the edge protectors or the support elements thereof are removably attached to the roller body by screwing, gluing or soldering.

12. The crush roller according to claim 1, wherein the edge protectors are removably attached to the roller body by a form-fitting connection.

13. The crush roller according to claim 1, wherein the spacing between two angularly adjacent pockets decreases or increases radially from a roller outer surface toward the roller axis.

14. The crush roller according to claim 1, wherein a depth of the pockets and of the edge protectors widens, at least in some areas, axially toward a center.

15. A roller crusher having two crush rollers according to claim 1.

16. A crush roller comprising: a cylindrical roller body rotatable about an axis and having axially oppositely directed end faces and a radially outwardly directed cylindrical outer surface; a respective row of radially outwardly and axially outwardly open pockets of generally semicylindrical shape formed at each of the end faces, each pocket opening radially outward at the outer roller-body surface and axially outward at the respective roller-body end face, the roller body being formed between the pockets with webs having radial outer ends flush with the roller-body outer surface; respective edge protectors fitting complementary in the pockets and having radially outwardly directed outer faces generally flush with the roller-body outer surface, the edge protectors being at the respective outer faces at least partially of a wear-resistant material significantly harder than the roller body, the protectors each being at the roller-body outer surface of an angular length at least five times as great as an angular length of the webs at the roller-body outer surface.

17. The crush roller defined in claim 16, wherein the webs are unitary with the roller body.

18. The crush roller defined in claim 17, wherein outer edge faces of the edge protectors are part-cylindrical and flush with the roller-body outer surface.

19. The crush roller defined in claim 17, wherein the protectors are generally semicircular and of uniform axial thickness.

20. The crush roller defined in claim 17, further comprising means fastening each of the protectors releasably in the respective pocket.

Description

BRIEF DESCRIPTION OF THE DRAWING

(1) In the following, the invention will be described in greater detail with reference to a drawing that illustrates embodiments. In the drawing:

(2) FIG. 1 is a perspective view of a detail of crush roller according to the invention in a first embodiment,

(3) FIG. 2 shows the crush roller of FIG. 1 in a modified second embodiment,

(4) FIG. 3 shows the crush roller of FIG. 1 in a modified third embodiment, and

(5) FIG. 4 is a cross-section of a modified embodiment of the invention,

(6) FIG. 5 a further option of the invention.

SPECIFIC DESCRIPTION OF THE INVENTION

(7) Each of the figures shows a crush roller 1 for a roller crusher, in particular for the high-pressure comminution of brittle, mineral feed material. The roller crusher generally consists of two crush rollers 1, only a part of one of which is shown in the drawing. Such a crush roller 1 can—as shown in the drawing—be a solid roll, in which case the roller body 2 is designed as a solid body. Alternatively, however, the roller body can also have a base body and a jacket surrounding the base body. This option is not shown in the drawing.

(8) In any case, such a crush roller is equipped with suitable wear protection that can be of various designs. The illustrations in the drawing are limited to wear protection measures in the region of the (end face) roller ends.

(9) For the wear protection in the region of the roller ends, the roller body 2 has, on one or both roller end edges, a plurality of pockets 3 distributed angularly and spaced from one another angularly in a tangential/angular direction T. The individual pockets 3 are separated from one another in the angular direction T by webs 4. Each of the pockets is open both axially and radially outward. A single hard body as a replaceable edge protector 5 is removably fitted into each of the individual pockets 3. The drawing shows the crush roller 1 in a partially assembled state, that is, a number of pockets 3 are shown without their edge protectors inserted, in the interest of clarity.

(10) Also indicated in FIG. 1 are the angular/tangential direction T, the axial direction A and the radial direction R. As has already been described, the individual pockets 3 are each open both axially and radially outward. Open axially therefore means open at the end face, i.e. on the side that faces away from the roller axis, in the axial direction A. Open radially outward means open on the side that faces away from the roller axis, in the radial direction R.

(11) Therefore, in the embodiment according to the invention, the known angular and continuously annular shoulders at the roller ends are dispensed with. Instead, individual recesses, and therefore pockets 3 are proposed, into each of which only a single edge protector 5 is fitted. According to the invention, the angular length L of the pockets and the angular length 1 of the fitted edge protectors 5 is greater than the angular spacing a between two directly adjacent pockets 3. The lengths L, 1 and the spacing a refer to the angular direction T of the roll, specifically in the region of the radial outer edges of the edge protectors. The spacing a between the individual pockets 3 therefore corresponds to the thickness of the webs 4, which are part of the roller body 2, between the pockets 3 and therefore also between the edge protectors 5. The pockets 3 are formed the roller body 2 for example by machining.

(12) With the embodiment according to the invention with individual pockets 3, the individual edge protectors 5 that are hard bodies do not come in contact with one another, and cannot be pressed against one another despite the high forces that occur, thereby preventing damage to these edge protectors. Moreover, with this embodiment, the compressive forces that occur can be easily passed to the roller body 2. This applies, in particular, to the embodiment illustrated in the drawing, in which the axial pockets 3 from the axial end view have a curved wall and/or base 3a, and the edge protectors 5 have a curved outer surface 5a that is complementary to the curved wall 3a. In the embodiment according to FIGS. 1 to 3, both the curved wall region 3a and the curved outer surface 5a are part-cylindrical.

(13) FIG. 1 shows a first embodiment in which the edge protectors 5 are made “homogeneously” of one and the same material. Such elements can be, for example hard bodies made of hard metal or hard metal-like materials (for example cermets). Alternatively, the hard bodies can also be made of a metal matrix composite. In the embodiment shown in FIG. 1, the edge protectors and/or hard bodies 5 are secured in the pockets without screws, for example by gluing or soldering.

(14) In an alternative embodiment, FIG. 2 shows edge protectors 5 that each has, as a composite structure, a support element 5b and a wear layer 5c carried thereby. The support element 5b consists of a ductile material, for example steel. The support elements 5b are therefore used primarily for fastening the edge protectors 5 in the respective pockets 3, whereas the wear layer 5c determines the edge protection properties and/or wear properties. For this purpose, the wear layer 5c can be made, for example of a hard metal or a hard metal-like material (for example cermet), or preferably also of a metal matrix composite. In this case, it is advantageous for the wear layer to be attached to the support element 5b by sintering and/or hot isostatic pressing. During manufacture, the individual edge protectors 5 comprising the support element 5b and the wear layer 5c are therefore prefabricated and are then installed in the pockets 3.

(15) FIG. 2 shows an embodiment in which the edge protectors 5 are attached to the roller body 2 by screws. The edge protectors 5 therefore have suitable openings 6 and/or bores through which the screws can be inserted into the roller body 2. In the embodiment of FIG. 2, these bores 6 for the screws are in the support elements 5 and therefore in ductile material.

(16) FIG. 3 shows an alternative embodiment in which the edge protectors 5 are attached to the roller body 2 in a form-fitting manner, specifically by a dovetail. For this purpose, each of the edge protectors 5 has a mounting land 7, and in the region of each of the individual pockets 3, a groove 8 extending in the radial direction is arranged in the roller body 2, both the mounting lands and the grooves 8 being of complementary dovetail shape. Despite this form-fitting connection, it can be advantageous to also fasten the edge protectors 5 in the pockets 3 by gluing or soldering.

(17) FIG. 3 optionally illustrates that these elements 5 can also be a composite component having a wear layer 5c and a support element 5b, the wear layer 5c being formed by a wear insert 5c that is fitted into a complementary recess of the support element 5b.

(18) The edge protectors 5 shown in the drawing are rectangular on the roller as viewed radially. From an axial end view of the end face of the roll, however, the edge protectors 5 in the embodiment—as described—are rounded in some areas. In principle, the invention also comprises embodiments in which the edge protectors are designed as polygonal, for example rectangular, from an axial end view of the end face, so that edge protectors in the form of a rectangular prism, for example can also be achieved. This is not shown in the drawing.

(19) It is also within the scope of the invention to alternatively or additionally provide the radial outer sides of the edge protectors with a curved shape, resulting, in particular, in an adaptation to the radius of curvature of the roll. This option is not illustrated.

(20) It is further within the scope of the invention—as described—for the radial depth of the pockets 3 and of the edge protectors 5 to widen, at least in some areas, axially toward the center of the roll. These options are illustrated by way of example in FIGS. 4 and 5. FIG. 4 shows an embodiment in which the radial inner wall 3a drops radially inward from the roller end axially toward the roller axis, forming a sloped bottom edge. The same is true of the corresponding lower outer surface 5a of the edge protector 5. This embodiment has the effect that the edge protectors are securely pressed into the pockets by the compressive forces that occur. Such an embodiment can be achieved in edge protectors of the most varied forms, for example also in the edge protectors shown in FIGS. 1 to 3. This applies likewise to the option illustrated in FIG. 5. There as well, the pockets 3 and the edge protectors 5 have a radial depth that increases in radial dimension axially toward the roller axis, at least in some areas, and in FIG. 5 this refers to the axial wall regions and/or the axial outer surface. The considerations on which FIG. 4 is based can therefore also be provided according to FIG. 5 in the axial regions of the pockets, and these options may also be combined with one another.