Roller press

Abstract

A roller press (1) is described for grinding of particulate material such as cement raw materials, cement clinker and similar materials, which roller press (1) comprises two oppositely rotating rollers (2, 3) forming between them a roller gap (4) and a co-rotating annular disc (5), which in concentric manner is attached to an end surface (6, 7) of one of the rollers (2) by means of a number of resilient attachment elements (8) and being movable in the direction of the roller axis, where the outer diameter of said annular disc (5) is greater than the diameter of said one of the rollers (2), hence the annular disc (5) in the area of the roller gap (4) extends toward the other roller (3), thus covering at least part of the roller gap (4). The roller press (1) is peculiar in that the inner diameter of the annular disc (5) is smaller than the diameter of the roller (2), to which it is attached, thus overlapping the end surface (6, 7) of said roller (2), and that the resilient attachment elements (8) are evenly distributed over the circumference of the annular disc (5) and provided with spaces or openings (10) there between. It is hereby obtained that the annular disc (5) does not get stuck by material to be grinded or destructive forces damaging construction parts are not accumulated. This is due to the fact that material in the roller press (1) according to the invention is allowed to escape from the area between the annular disc (5) and the roller (2) to which it is attached.

Claims

1. A roller press for grinding particulate material, the roller press comprising: first and second oppositely rotating rollers, one of the first and second rollers mounted so as to be movable relative to the other of the first and second rollers, the rollers forming a roller gap there between; a co-rotating annular disc concentrically attached to an end surface of the first roller directly by a plurality of resilient attachment elements, the annular disc mounted so as to be movable in the direction of a roller axis; wherein an outer diameter of the annular disc is greater than an outer diameter of the first roller, such that the annular disc in the area of the roller gap covers at least part of the roller gap; wherein an inner diameter of the annular disc is smaller than the diameter of the first roller such that the annular disc overlaps the end surface of the first roller; wherein the plurality of resilient attachment elements are evenly distributed over the circumference of the annular disc; and wherein the plurality of resilient attachment elements are provided with spaces or openings there between.

2. A roller press according to claim 1, wherein the plurality of resilient attachment elements comprise a first end and second end, the first end being secured to the annular disc by a fastening means and the second end being secured to the end surface of the first roller by the fastening means.

3. A roller press according to claim 1, wherein the plurality of resilient attachment elements are comprised of spring steel.

4. A roller press according to claim 1, wherein the plurality of resilient attachment elements have the form of sheets.

5. A roller press according to claim 1, wherein the plurality of resilient attachment elements are comprised of a middle section having an outwardly curved form.

6. A roller press according to claim 1, wherein the resilient attachment elements are mounted at a distance from the end surface of the first roller by bushing.

7. A roller press according to claim 2, wherein the second end is dimensioned such that each resilient attachment element abuts an adjacent resilient attachment element.

8. A roller press according to claim 1, wherein the outer diameter of the annular disc is dimensioned such that the annular disc in the area of the roller gap overlaps an end surface of the second roller.

Description

(1) The invention will now be described in further details with reference to the attached drawing, being diagrammatical, and where

(2) FIG. 1 shows in perspective a section of a roller press, and

(3) FIG. 2 shows details of the roller press illustrated in FIG. 1.

(4) FIG. 1 shows a roller press 1 which comprises two oppositely rotating rollers 2, 3 forming between them a roller gap 4. At both axial ends of one of the rollers 2 the roller press 1 further comprises a co-rotating annular disc 5, which is concentrically attached to an end surface 6, 7 of said roller 2 by means of a number of resilient attachment elements 8 and being movable in the direction of the roller axis. The outer diameter of both annular discs 5 is dimensioned to ensure that the annular discs 5 in the area of the roller gap 4 under normal operation of the roller press 1 overlaps an end surface 9 of the other roller 3, thus covering the whole roller gap 4 at both axial ends of the roller press 1.

(5) In order to ensure that the annular discs 5 do not get stuck by material to be grinded or destructive forces damaging construction parts are not accumulated it is suggested according to the invention that the inner diameter of the annular discs 5 is smaller than the diameter of the roller 2, to which they are attached, thus overlapping the respective end surfaces 6, 7 of said roller 2, and that the resilient attachment elements 8 are evenly distributed over the circumference of the annular discs 5 and provided with spaces or openings 10 there between.

(6) Thus, during operation the annular discs 5 are effectively prevented from entering into the roller gap 4 and getting stuck there. Further, when the material being treated in the roller press presses against the annular discs 5, they will move away from the roller end, thereby forming in both ends of the roller press 1 a relatively small annular gap between the respective annular disc 5 and the roller end surface 6, 7, allowing material to flow away from the roller gap. In this way, the force acting on the resilient attachment elements 8 is prevented from exceeding what they are dimensioned to withstand. The spaces or openings 10 provided between the resilient attachment elements 8 allow the material flowing from the roller gap 4 through the annular gap to flow away from these elements, thereby preventing malfunction of these.

(7) FIG. 2 shows a preferred embodiment of the resilient attachment element 8. As can be seen in the FIG. 2 the resilient attachment element 8 is in one of its ends 8a secured to the annular disc 5 and in the other end 8b to the roller end surface 6 by means of bolts 11.

(8) The resilient attachment elements 8 are made of spring steel and have the form of sheets, which are provided with a middle section 8c having an outwardly curved form. Further, as seen in FIG. 2, each resilient attachment element 8 is mounted in a distance from the roller end surface 6 by means of a spacing bush 12, thus the centre of rotation of each resilient attachment element 8 is positioned a distance away from the roller end surface 6, thus reducing the stresses in the resilient attachment elements 8 and providing passageways between the bushes 12 for the material to flow out.

(9) As shown in FIG. 1 all the resilient attachment elements 8 are of like configuration, and are further in their ends 8b, which is secured to the roller end surface 6, dimensioned so that they abut one another, hence locking the resilient attachment elements 8 in the circumferential direction.