AU2019251695A1

AU2019251695A1 - Grinding roller and roller press

Info

Publication number: AU2019251695A1
Application number: AU2019251695A
Authority: AU
Inventors: Herbert Hoffmann; Bernhard Peterwerth
Original assignee: ThyssenKrupp AG; ThyssenKrupp Industrial Solutions AG
Current assignee: FLSmidth AS
Priority date: 2018-04-12
Filing date: 2019-04-03
Publication date: 2020-11-26
Anticipated expiration: 2039-04-03
Also published as: EP3774054B1; CL2020002593A1; FI3774054T3; DE102018108690A1; BR112020020752A2; PE20210091A1; WO2019197240A1; EP3774054A1; AU2019251695B2

Abstract

The invention relates to a grinding roller for a roller press, comprising a cylindrical roller body (6) and at least one lateral wall (7) which is arranged on an end side of the roller body (6) and rotationally fixed to the roller body (6), and which protrudes beyond the outer casing surface of the roller body (6) on the outer side. In addition, the connection between the roller body (6) and the lateral wall (7) is brought about by means of at least one screw connection (9), wherein, in the un-connected state, i.e. when the screw connection provided for the connection is at least not yet tightened with a defined target tightening torque, the lateral wall (7) is in contact with the end wall of the roller body (6) in a first section (13) and a gap (18) is formed between the lateral wall and the end wall of the roller body in a second section (14). In contrast, in the connected state, i.e. when the screw connection (9) provided for the connection is tightened with the defined target tightening torque, this gap (18) is at least partially, preferably completely eliminated as a result of an elastic deformation of the lateral wall (7). Due to this embodiment of the grinding roller, relatively high axial forces acting on the lateral wall (7) can be compensated by a relatively low tightening torque for the screw connection(s) (9), which has a positive effect on the lifespan of the connection.

Description

GRINDING ROLLER AND ROLLER PRESS

The invention relates to a grinding roller for a roller press and a roller press having two grinding rollers forming a roller gap.

In a roller press, a bed of material, the so-called feed or grinding material, is fed in from above, drawn into the roller gap formed between the grinding rollers and compressed and comminuted in the process.

The grinding material is usually fed in via a feed chute arranged above the roller gap. Lateral walls of the feed chute can regularly project on the end sides of the grinding rollers as far as the high-pressure zone in the roller gap, in order to prevent the compacted rolled material escaping at the axial ends of the grinding rollers or the roller gap. These thus also function as lateral guides for the grinding material, in order to keep the latter within the roller gap.

Alternatively to integrating lateral guides for the grinding material in a feed chute arranged above the roller gap of a roller press, provision can also be made to provide one of the grinding rollers with a respective lateral wall at the two axial ends, which lateral wall is firmly connected, specifically screwed, to a cylindrical roller body of said grinding roller, and which projects beyond the lateral surface of said roller body on the outside (cf. EP 2 653 230 A2 or EP 3 248 685 A2).

The pressure exerted by the grinding material on lateral guides of a roller press in the direction of the longitudinal and rotational axes of the grinding rollers rises in a manner corresponding to the progressive compaction and is at its highest in the high-pressure region within the roller gap. In particular, the pressure exerted by the rolled material creates considerable forces on the lateral guides, which, in conjunction with the movement of the grinding material relative to the lateral guides and the usually highly abrasive properties of the grinding material, bring about considerable wear of the lateral guide. Added to this, in a configuration of the lateral guides according to the roller presses disclosed in EP 2 653 230 A2 or EP 3 248 685 A2, is the fact that the forces exerted on the lateral guides and lateral walls have a high dynamic component, by which a corresponding high level of stress is caused in the screws used for the connection of the lateral walls to the roller body, which limits the lifespan of said screws or, in the event of a designed predefined lifespan of

matters) P114484.AU the screws, restricts the dynamic loading and therefore the load-bearing capacity of the roller press.

In a roller press as disclosed by EP 2 653 230 A2 or EP 3 248 685 A2, the invention is based on the object of achieving a relatively high load-bearing capacity with a relatively long lifespan of the fixing of the lateral walls used as lateral guides for the grinding material in the simplest possible manner.

This object is achieved by means of a grinding roller as claimed in patent claim 1 and a roller press as claimed in patent claim 13. Advantageous refinements of the grinding roller according to the invention and the roller press according to the invention are the subject matter of the further patent claims and/or can be gathered from the following description of the invention.

According to the invention, a grinding roller for a roller press, in particular for a high-pressure or product-bed roller press, is provided, which has a cylindrical roller body (the statement cylindrical relates to the shape of the lateral surface), and has at least one preferably circular (annular) lateral wall which is arranged on an end side of the roller body and co-rotationally fixed to the roller body, and which protrudes beyond the outer lateral surface of the roller body (in particular over its entire circumference) on the outside. Furthermore, provision is made for the connection between the roller body and the lateral wall to be brought about by means of at least one screw connection, wherein, in the unconnected state, i.e. when the screw connection provided for the connection has not yet tightened with a defined target tightening torque, the lateral wall rests on the end wall of the roller body in a first section, in which preferably no screw connection is arranged, and, in a second section, in which the screw connection is preferably arranged, a gap is formed between the lateral wall and the end wall of the roller body. By contrast, in the connected state, i.e. when the screw connection provided for the connection has been tightened with the defined target tightening torque, said gap is at least partly eliminated (i.e. the gap width is reduced), preferably completely, eliminated, as a result of elastic deformation of the lateral wall. The invention also relates to a corresponding method for assembling a grinding roller according to the invention, in which the screw connections are tightened with the target tightening torque.

Because of this configuration of the grinding roller, relatively high axial forces (i.e. forces which act on the lateral wall along the longitudinal or rotational axis of the grinding roller or

matters) P114484.AU of the roller body), which result from a correspondingly high grinding power of a roller press (according to the invention) comprising at least one grinding roller according to the invention, can be compensated with a relatively low tightening torque for the screw connection(s) because, as a result of the elastic deformation of the lateral wall as the screw connection is tightened with the target tightening torque, a particularly high increase in the contact pressure within the first section can be achieved. On the other hand, if the lateral surface were also already to rest on the end side of the roller body in the second section in the unconnected state, then the subsequent formation of the connection as a result of the tightening of the screw connection would act primarily on the contact pressure within the second section, which would necessitate a particularly high tightening torque in order also to ensure an adequately high contact pressure in the first section which, during operation, prevents the lateral wall lifting off the end side of the roller body (in thisfirst section) and therefore ensures a sufficient sealing action and lateral guidance action for the grinding material.

Since such a sealing action is important in particular in the region of the outer lateral surface of the roller body, provision can preferably be made for the first section to be located radially further out than the second section.

According to a preferred configuration of a grinding roller according to the invention, a third section can also be provided in the contact region formed between the lateral wall and the end side of the roller body, in which, in the unconnected stage, the lateral wall rests on the end wall of the roller body, wherein the third section is located radially further in than the second section. As a result, advantageous, defined elastic deformation of the lateral wall within the context of the invention, which is brought about by tightening the screw connection(s), can be implemented. Provision can further preferably be made for the first section and/or the second section and/or the third section, if present, to be circumferentially closed, i.e. annularly.

According to a further preferred configuration of a grinding roller according to the invention, provision can additionally be made for at least one further section to be provided, in which, even in the connected state, a gap is formed between the lateral wall and the end wall of the roller body. Said further section, which preferably can likewise be annularly or circumferentially closed, can preferably be arranged between the first section and the second section or between the second section and the third section. Particularly preferably, at least two such further sections can be provided, of which one is arranged between the first section

matters) P114484.AU and the second section and another is arranged between the second section and the third section. In this way, an advantageous connection between the lateral wall and the roller body can be implemented, which in particular can be limited to a contact in the first section and the second section and, if appropriate, i.e. if present, in the third section.

The lateral wall of a grinding roller according to the invention can preferably be formed from a plurality of segments, i.e. from parts which each cover only one circumferential section of the end side of the roller body, wherein each segment is connected to the roller body by means of at least one screw connection, and wherein the mutually adjacent segments are additionally connected to one another in such a way that axial forces can be transmitted by means of said connection(s). Such a segmentation advantageously permits replacement of individual segments or also all segments and therefore of the entire lateral wall without having to disassemble the entire grinding roller from the assembly into which the latter is integrated to form the roller press. The segments can in particular be lifted in a simple way from a roller shaft or roller axle passing through the grinding roller and therefore both the roller body and the lateral wall or walls. As a result of the connection transmitting axial forces between adjacent segments, relatively high axial forces can be supported by the lateral wall as a whole.

According to a preferred configuration, the connections of adjacent segments can be provided in the form of at least one tongue and groove pair respectively integrated into mutually adjacent contact surfaces of the segments. By means of such a tongue and groove pair, in which a depression is introduced into at least one of the contact surfaces, in which a body (tongue, in particular key) serving as a transmission element engages, wherein the tongue can be formed as a protrusion from the respective other contact surface or as a separate component, a transmission of very high (axial) forces can be implemented in a constructionally very simple way. Furthermore, such a connection can also permit tool-free detachment and attachment of the mutually adjacent segments with the aim of disassembling or replacing the lateral wall or at least one segment thereof.

According to a preferred development of such a grinding roller according to the invention, provision can additionally be made for the tongue of the tongue and groove pair to be formed from a material of which the yield limit is lower than the yield limit of the material of at least that section of the segment or segments in which the groove of the tongue and groove pair is

matters) P114484.AU formed. As a result, by means of such a tongue and groove pair, particularly high (axial) forces can be transmitted reliably, since the pressure between the tongue and the surfaces delimiting the groove, and therefore also the material stress in the groove radii, can be limited, since the tongue deforms elastically or possibly also plastically and, as a result, can lead to the most uniform possible pressure loading between the contact surfaces of the tongue and those of the associated groove.

As an alternative to a configuration of a grinding roller according to the invention with a segmented lateral wall, i.e. one formed from a plurality of segments, provision can also be made for the lateral wall to be non-segmented and, if appropriate, even to be made in one piece. As a result, weak points which are formed in the region of the connection of adjacent contact surfaces of the segments can be avoided. However, the disadvantage with such a non segmented lateral wall can be the increased effort on assembly, in particular for a replacement of such a lateral wall.

According to a further preferred configuration of a grinding roller according to the invention, provision can be made for the roller body to have a main body and at least one wearing body detachably connected thereto, wherein the wearing body forms the second section of the end side of the roller body that is connected to the lateral wall. Such a wearing body can be deliberately subjected to the wear occurring in particular in the region of the second section. Its detachable connection to the main body of the roller body permits rapid and economical replacement. To adapt the wearing body, provision can further preferably be made for the latter to be formed from a material (e.g. highly wear-resistant steel sheet) that is particularly suitable for this wearing function, so that, if appropriate, the main body (e.g. forged steel) and the wearing body are formed from different materials.

A roller press according to the invention comprises at least two grinding rollers, which form or delimit a roller gap, wherein at least one of the same is formed as a grinding roller according to the invention. Provision can be made for only one of these two grinding rollers to be formed according to the invention, wherein lateral walls are provided on the two end sides of the roller body of said grinding roller in a manner according to the invention. The other grinding roller can then be formed without lateral walls and project into the interspace delimited laterally by the lateral walls of the grinding roller according to the invention. Alternatively, provision can also be made for both of the grinding rollers to be formed

matters) P114484.AU according to the invention, wherein a lateral wall is provided in the manner according to the invention for each of the grinding rollers on one of the end sides of the associated roller body. The end sides of the two grinding rollers that are connected to the lateral walls, and therefore also the two lateral walls, are arranged at the two different (axial) ends of the roller press or the grinding rollers.

The invention will be explained in more detail below by using an exemplary configuration illustrated in the drawings, in which:

Fig. 1: shows a grinding roller according to the invention in a perspective view;

Fig. 2: shows the grinding roller in a side view;

Fig. 3: shows the grinding roller in a longitudinal section along the sectional faces identified by A - A in fig. 2;

Fig. 4: shows a section through a lateral wall of the grinding roller along the sectional plane identified by C - C in fig. 2;

Fig. 5: shows an enlarged illustration of the section of the grinding roller identified by Z in fig. 3 in the unconnected state;

Fig. 6: shows an enlarged illustration of the section of the grinding roller identified by Z in fig. 3 in the connected state;

Fig. 7: shows a simplified illustration of a roller press according to the invention according to a first configuration in a side view;

Fig. 8: shows the roller press according to fig. 7 in a plan view; and

Fig. 9: shows a simplified illustration of a roller press according to the invention according to a second configuration in a plan view.

Figs 1 to 6 show a configuration of a grinding roller 1 according to the invention which is provided as a constituent part of a roller press 2 according, for example, to figs 7 and 8. Said roller press 2 comprises two grinding rollers 1, 3, which are aligned in such a way that their longitudinal axes 4 extend as parallel as possible to each other. As a result, a roller gap 5 of constant width which is placed in the plane formed by the two longitudinal axes 4 is formed between the grinding roller 1. A first (1) of the grinding rollers 1, 3 is formed according to figs 1 to 5 and comprises a hollow cylindrical roller body 5 and two lateral walls 7, each of

matters) P114484.AU which is connected to one of the end walls of the roller body 6 that are placed at the axial ends. The second grinding roller 3 does not comprise such end walls 7, the distance between the grinding rollers 1, 3 being chosen such that a roller body 7 of the second grinding roller 3 is partly arranged within the interspace delimited laterally by the two lateral walls 7 of the first grinding roller 1.

During operation of the roller press 2, grinding material (not illustrated) is fed into the inlet pocket formed on the upper side between the grinding rollers 1, 3 via, for example, a feed chute (not illustrated). As a result of a rotational drive of the grinding rollers 1, 3 in opposite directions according to the direction of rotation arrows illustrated in fig. 7, the grinding material is then drawn gradually into the roller gap 5 and compacted and comminuted in the process. The lateral walls 7 of the first grinding roller 1, covering the roller gap 5 and the two axial ends of the grinding rollers 1, 3, prevent grinding material from escaping from the longitudinal axial ends of the roller gap 4. The comminuted ground material emerging at the bottom can fall into a container (not illustrated) arranged underneath the roller gap 5 or onto a conveyor belt positioned there.

Each of the annular lateral walls 7 comprises a plurality of (annular) segments 8, each of which is connected to the roller body 6 via a plurality of screw connections 9. The screw connections 9 each comprise a threaded bolt 10 which is screwed with an outer thread into an associated internal thread which is formed by a main body 11 of the roller body 6, and a nut 12 which is screwed onto the threaded bolt 10 on the side facing away from the roller body 6 and rests on the adjacent side of the lateral wall 7 (cf. in particular figs 5 and 6). Each contact region which is formed between one of the lateral walls 7 and the adjacent end face of the roller body 6 is subdivided into a first section 13, a second section 14, a third section 15 and two further sections 16, 17, which each have an annular shape. In the as yet unconnected state, i.e. when the screw connections 9 have not yet each been tightened with a target tightening torque, the lateral walls 7 already contact the associated end face of the roller body in the respective first section 13 and the respective third section 15, while a gap 18 with a gap width of, for example, about 0.4 mm (cf. fig. 5) is still formed within the second section 14. In the connected state, when the screw connections 9 have consequently respectively been tightened with the target tightening torque, the gap previously formed within the second section 14 is eliminated completely, on the other hand, so that the lateral walls each contact the associated end face of the roller body 6 in this section 14 as well (cf. fig. 6). By contrast, matters) P114484.AU in the two further sections 16, 17, of which a first (16) is placed between the first section 13 and the second section 14, and the second (17) is placed between the second section 14 and the third section 15, the lateral walls 17 do not also contact the respective end faces of the roller body 6 in the connected state, as a result of which overall an advantageous contact between the lateral walls 7 and the respectively associated end faces of the roller body 6 results, specifically exclusively in the three annular sections 13, 14 and 15 spaced apart from one another.

The individual segments 8 of the lateral walls 7 are connected to one another in such a way that said connections can transmit axial forces, i.e. forces which act along the longitudinal or rotational axis 4 of the grinding roller 1. For this purpose, a tongue and groove pair is respectively primarily provided in each dividing region of adjacent segments 8. In each of the contact surfaces of the segments which form such a dividing region, a groove extending radially with respect to the longitudinal or rotational axis 4 of the grinding roller 6 is formed, wherein the grooves of adjacent contact surfaces overlap and, as a result, form a receiving space, within which a tongue (key) 19 is arranged (cf. fig. 4). Via this tongue 19, axial forces can be transmitted between adjacent segments 8 of the lateral surfaces 7. At the same time, the tongue and groove pairs do not prevent a segment 8 from being lifted in the radial direction, as a result of which simple disassembly and possibly replacement of individual segments 8 or else of the lateral walls 7 overall is consequently made possible. In particular, it is made possible as a result that the lateral walls 7 do not have to be drawn off in the axial direction from a roller axle or roller shaft 20 of the grinding roller 1 for replacement. In order to cover the tongue and groove pair, use is respectively made of a covering plate 21, which is screwed by means of two screw connections 22 to the two adjacent segments 8 (cf. in particular fig. 4).

As emerges in particular from figs 5 and 6, the roller body 6 of the grinding roller 1 comprises, in addition to the main body 11, two further annular wearing bodies 23, which are each arranged at one of the two axial ends of the main body 11. The wearing bodies 23 each form the region of the respective end face of the roller body 6 that is arranged within the first section 13, the second section 14 and the further section 16 that is located between them. The wearing bodies 23 are in each case connected via the associated lateral wall 7 and the associated screw connections 9 to the main body 11 of the roller body 6, by the lateral wall 7 pressing the respective wearing bodies 23 into an appropriately formed depression in the main matters) P114484.AU body 11. The threaded bolts 10 of the associated screw connections 9 each project through one of a corresponding number of passage openings in the wearing body 23. The wearing bodies 23 consist, for example, of highly wear-resistant steel sheet, while the main body of the roller body is formed from forged steel. The lateral walls can in particular have been made of steel sheet.

In sections which are placed at the two axial ends, the main body 11 of the roller body 6 forms a multiplicity of receiving openings 24 which are open to the lateral surface, which are used to receive wear protection bodies, for example made of a hard metal.

The lateral walls 7 are also provided with a wear protection layer 25 on the side respectively facing the roller body 6 and in the section projecting beyond the roller body 6 on the outside.

Fig. 9 shows an alternative configuration for a roller press 2 according to the invention. In the same, each of the grinding rollers 1 is provided with a (single) lateral wall 7 according to the invention, of which the configuration and connection to the respective roller bodies 6 can be provided according to the lateral walls 7 of the grinding roller 1 according to figs 1 to 6. In order to achieve a covering for both sides of the roller gap 5 by means of the lateral walls 7, the individual lateral walls 7 are arranged at the different ends of the roller press 2 and of the grinding rollers 1.

matters) P114484.AU

List of designations

1. Grinding roller

2. Roller press

3. Grinding roller

4. Longitudinal axis of a grinding roller

5. Roller gap

6. Roller body

7. Lateral wall

8. Segment of a lateral wall

9. Screw connection

10. Threaded bolt

11. Main body of the roller body

12. Nut

13. First section of the contact region of lateral wall and roller body

14. Second section of the contact region of lateral wall and roller body

15. Third section of the contact region of lateral wall and roller body

16. First further section of the contact region of lateral wall and roller body

17. Second further section of the contact region of lateral wall and roller body

18. Gap

19. Tongue

20. Roller shaft

21. Connecting plate

22. Screw connection

23. Wearing body

24. Receiving openings

matters) P114484.AU

25. Wear protection layer

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Claims

PATENT CLAIMS

1. A grinding roller (1) having a cylindrical roller body (6) and at least one lateral wall (7) which is arranged on an end side of the roller body (6) and co-rotationally fixed to the roller body (6), and which protrudes beyond the outer lateral surface of the roller body (6) on the outside, characterized in that the connection between the roller body (6) and the lateral wall (7) is brought about by means of at least one screw connection (9), wherein, in the unconnected state, the lateral wall (7) rests on the end wall of the roller body (6) in a first section (13) and, in a second section (14), a gap (18) which, in the connected state, is at least partly eliminated as a result of elastic deformation of the lateral wall (7), is formed between the lateral wall (7) and the end wall of the roller body (6).

2. The grinding roller as claimed in claim 1, characterized in that the first section (13) is located radially further out than the second section (14).

3. The grinding roller (1) as claimed in claim 1 or 2, characterized in that the screw connection (9) is arranged within the second section (14).

4. The grinding roller (1) as claimed in one of the preceding claims, characterized by a third section (15) in which, in the unconnected state, the lateral wall (7) rests on the end wall of the roller body (6), wherein the third section (15) is located radially further in than the second section (14).

5. The grinding roller (1) as claimed in one of the preceding claims, characterized in that the first section (13) and/or the second section (14) and/or the third section (15) is/are circumferentially closed.

6. The grinding roller (1) as claimed in one of the preceding claims, characterized in that at least one further section (16, 17) is provided, in which, even in the connected state, a gap is formed between the lateral wall (7) and the end wall of the roller body (6).

7. The grinding roller (1) as claimed in one of the preceding claims, characterized in that the lateral wall (7) is formed from a plurality of segments (8), wherein each segment (8) is connected to the roller body (6) by means of at least one screw connection (9), and wherein the mutually adjacent segments (8) are connected to one another in such a way that axial forces can be transmitted by means of said connection(s).

matters) P114484.AU

8. The grinding roller (1) as claimed in claim 7, characterized in that a tongue and groove pair is integrated into mutually adjacent contact surfaces of the segments (8).

9. The grinding roller (1) as claimed in claim 8, characterized in that the tongue (19) of the tongue and groove pair is formed from a material of which the yield limit is lower than the yield limit of the material of that segment or those segments in which the groove of the tongue and groove pair is formed.

10. The grinding roller (1) as claimed in one of claims 1 to 6, characterized in that the lateral wall (7) is non-segmented.

11. The grinding roller (1) as claimed in one of the preceding claims, characterized in that the roller body (6) has a main body (11) and at least one wearing body (23) detachably connected thereto, wherein the wearing body (23) forms the second section (14) of the end side of the roller body (6) that is connected to the lateral wall (7).

12. The grinding roller (1) as claimed in claim 11, characterized in that the main body (11) and the wearing body (23) are formed from different materials.

13. A roller press (2) comprising two grinding rollers (1, 3) which form a roller gap (5), characterized in that at least one of the grinding rollers (1, 3) is formed as claimed in one of the preceding claims.

14. The roller press (2) as claimed in claim 13, characterized in that both of the grinding rollers (1, 3) are formed as claimed in one of claims 1 to 12, wherein an appropriately connected lateral wall (7) is provided for each of the grinding rollers (1, 3) on one of the end sides of the associated roller body (6), and wherein the end sides of the two grinding rollers (1, 3) that are connected to the lateral walls (7) are arranged at different ends of the roller press (2).

15. The roller press (2) as claimed in claim 13, characterized in that one of the grinding rollers (1) is formed as claimed in one of claims1 to 12, wherein appropriately connected lateral walls (7) are provided on the two end sides of the associated roller body (6), and the other grinding roller (3) is formed without lateral walls (7).

matters) P114484.AU