ROLLER PRESS

Abstract

Roll crusher, in particular for comminuting material, with two rotatable crush rolls (1) forming a nip (2) into which the material to be processed is fed, wherein at axial ends of the rolls the nip (2) is closed by end plates (3), wherein the end plates each comprise a base plate (5) and a wear-protection layer (6) attached to the base plate (5), wherein the wear-protection layer (6) is formed at least in a first wear zone (6a) of individual wear-protection elements that at least partially are made of a wear-resistant material with a hardness greater than that of the base plate (5)

This roll crusher is characterized in that the wear-protection elements in the first wear zone (6a) are formed by studs (9), in that the base plate (5) in the first wear zone (6a) comprises a plurality of individual recesses (10) incorporated in the base plate (5) and in that an individual stud (9) is seated with its entire length (L) into each recess (10) in such a way that the studs (9) do not project past the recesses (10).

Claims

1. In a roll crusher for comminuting material and having two crush rolls rotatable about respective axes and forming an axially extending nip into which the material to be processed is fed and wherein at axial ends of the rolls the nip is closed axially by end plates having axially confronting plate faces, the end plates each comprise a base plate and a wear-protection layer attached to the base plate, and each wear-protection layer is formed at least in a first wear zone of a respective array of individual wear-protection elements at least partially made of a wear-resistant material of greater hardness than the base plate, the improvement wherein the wear-protection elements in the first wear zone are studs, the base plate is formed in the first wear zone with an array of recesses each opening at the respective plate face, and each stud is seated with its entire length into a respective one of the recesses such that the studs do not project outward past the the respective plate face.

2. The roll crusher according to claim 1, wherein the studs are flush in the respective recesses.

3. The roll crusher according to claim 2, wherein a length of the studs is equal to a depth of the recesses.

4. The roll crusher claim 1, wherein the recesses are separated from one another by webs of the base plate and the studs are inserted with their full lengths into the respective recesses such that the studs do not project past the webs out of the recesses, the studs terminating flush with the webs.

5. The roll crusher according to claim 1, wherein the recesses are cylindrical drilled holes and the studs are complementarily cylindrical.

6. The roll crusher according to claim 4, wherein the webs each have a minimum thickness that is less than half a diameter of the respective recess.

7. The roll crusher according to claim 1, wherein the studs have a diameter of 6 mm to 20 mm and the webs have a minimum thickness of less than 8 mm.

8. The roll crusher according to claim 1, wherein the studs inserted into the recesses are also fixed in the recesses by a bond through adhesion, soldering or welding.

9. The roll crusher according to claim 1, wherein the base plates are each produced of ductile steel in one piece by machining.

10. The roll crusher according to claim 1, wherein the wear-protection studs are made of a wear-resistant, multiphase material.

11. The roll crusher according to claim 1, wherein the base plates each comprise a second wear zone that is formed by a planar recess holding a plurality of adjoining wear-protection elements formed by flat tiles.

12. The roll crusher according to claim 1, wherein the end plates are detachably fastened to respective support plates, the support plates with the end plates fastened thereon being fastened to a machine frame of the roll crusher.

13. An end plate for a roll crusher according to claim 1, wherein the wear-protection layer, at least in a first wear zone, is formed of individual wear-protection elements that are made of a wear-resistant material with a hardness greater than that of the base plate, wherein the wear-protection elements in the first wear zone are formed by stud-like wear-protection elements and consequently as studs, in the first wear zone the base plate comprises a plurality of individual recesses of a depth formed in the base plate, each of the recesses holds a respective one of the wear-protection studs with its full length in such a way that the studs do not project out of the recesses and preferably terminate flush with the recesses.

Description

[0024] The invention will be described below by way of drawings showing only one form of embodiment. In these

[0025] FIG. 1 is a schematic view of a section from a roll crusher in the area of a end plate in a very simplified manner,

[0026] FIG. 2A is a view like FIG. 1 showing an end plate of the roll crusher according to FIG. 1,

[0027] FIG. 2B is cross-section A-A from FIG. 2A,

[0028] FIG. 2C is cross-section B-B from FIG. 2A,

[0029] FIG. 3A shows the end plate according to FIG. 2A without wear resistance elements,

[0030] FIG. 3B is cross-section C-C through the object according to FIG. 3A and

[0031] FIG. 3C is cross-section D-D through the object according to FIG. 3A.

[0032] The figures schematically show a very simplified view of the material input area of a roll crusher that can be used, for example, for comminuting material and that is also known as a high-pressure roll crusher or material bed roll mill. The roll crusher comprises two crush rolls 1 that counter rotate in an unillustrated machine frame. The crush rolls 1 are shown schematically. The crush rolls 1 form a nip 2 that narrows like a funnel in the direction of rotation of the rolls. The material to be processed is introduced into this nip 2 from above, for example by a gravity feed or also by a feed auger. Details are not shown, as the invention particularly relates to the end plates 3, which in a roll crusher of this type are at ends of the crush rolls 1 and consequently close the nip 2 at the axial ends of the rolls. In FIG. 1 only one of these end plates 3 is shown fastened on a support plate 4. In turn, these support plates 4 are fastened on the unillustrated machine assembly or machine frame of the roll crusher so that the end plates 3 are exchangeable, since operation of the rolls subjects the end plates 3 to considerable wear. The end plate 3 fastened to the support plate 4 according to FIG. 1 is shown in different views in each of FIGS. 2A, 2B and 2C.

[0033] FIGS. 2A, 2B and 2C show that the end plate 3, which in practice is also known as a “cheek plate,” comprises on the one hand a base plate 5 and on the other hand a wear-protection layer 6 attached to the base plate 5. In the area of particularly greatest wear, the wear-protection layer 6 has a first wear zone 6a that in particular covers the area of the minimal gap with of the nip 2 as in this area particularly great forces and hence particularly great stresses with corresponding wear occur. Furthermore the wear-protection layer 6 comprises a second wear zone 6b, which in particular relates to the area above the first wear zone 6a in which the nip widens in a funnel-like manner contrary to the direction of rotation. Also, the second wear zone 6b comprises two outer areas flanking the first wear zone 6a as less wear occurs in these areas as well. In each of the second wear zones 6b the wear-protection layer 6 is formed in a fundamentally known manner of individual wear-protection elements made of a wear-resistant material, designed flat as tiles 7. For this the base plate 5 has a planar recess 8 into which a plurality of such adjoining tiles 7 are inserted so that in the area of the second wear zone 6b a planar wear-protection layer of these tiles 7 is created. These tiles 7 are made for example of hard metal.

[0034] However, according to the invention the wear-protection elements in the first wear zones 6a have stud-like wear-protection elements and consequently wear-protection pins or studs 9. These preferably each have a length L that is greater than a diameter D of the stud 9, preferably more than double the diameter D. In addition, the figures show that the base plate 5 in the first wear zone 6a is formed with a plurality of individual recesses 10. Each of these recesses 10 holds a respective one of the studs 9, inserted over their entire length L in such a way that the studs 9 do not project out of the recesses 10, but in this embodiment are flush in the recesses 10. In this embodiment this is achieved in that the length L of the studs (essentially) matches a depth T of the recesses 10. The studs 9 can (also) be made of hard metal. The base plate 5 is made of a ductile metal, for example steel. Preferably the base plate 5 is produced in one piece, i.e. the planar recess 8 as well as the individual recesses 10 are unitarily formed into the base plate, for example by machining. The cylindrical recesses 10 for the studs 9 can be designed, for example, as drilled holes preferably with a flat base.

[0035] The design of the base plate 5 is evident particularly by comparison of FIGS. 2A, 2B and 2C with FIGS. 3A, 3B and 3C, as FIGS. 2A, 2B, 2C show the finished end plate 3 with base plate 5 and the wear-protection layer 6 attached thereto. In contrast, FIGS. 3A, 3B and 3C only show the base plate 5 without the wear-protection layer, i.e. without the tiles and the studs.

[0036] Particularly FIGS. 3A to 3C show that the recesses 10 in the base plate 5 are separated from each other by webs 11 that each fully or partially circumferentially surround the recesses 10. The studs 9 are now inserted into the recesses 10 in such a way that they do not project past the webs 11 out of the recesses, but the outer end faces of the studs 9 preferably terminate flush with the webs 10 so that in the area of the first wear zone 6a a uniform, flat surface of the wear-protection layer is formed. In addition, it can be seen that the recesses 10 and therefore also the studs 9 are very closely set next to each other, i.e. in the area of their minimum thickness the webs are relatively narrow, having a minimum thickness b that is less than half the diameter d of the recesses 10.

[0037] It can also be seen that the tiles 7 and the planar recess 8 are also dimensioned in such a way that the surfaces of the tiles 7 terminate flush with the planar recess 8 or the surrounding of the planar recess 8 and also flush with the studs 9, so that overall a uniform wear-protection layer 6 with an essentially flat surface is formed.