EP2986442B1 - Press roller - Google Patents

Description

The invention relates to a press roller for a roller press, in particular for briquetting, compacting or grinding of granular material, with a roller core and a roller shell which is fastened on the peripheral side of the roller core and which is composed of a plurality of segments distributed over the circumference with mutually facing end faces, the segments have circumferential clamping shoulders with first clamping surfaces, and the segments are detachably fastened to the roller core with at least one fastening ring each, which overlaps the clamping shoulders of the segments. - It is preferably a press roller for a roller press for hot briquetting or hot compacting, e.g. B. hot briquetting or hot compacting of directly reduced iron (DRI). Granular material also means dusty or powdery material in the context of the invention. The (double-sided) end surfaces are the surfaces that limit the respective segment in the circumferential direction. An end face of a segment consequently faces an end face of a segment which is adjacent or follows in the circumferential direction. The end faces are oriented parallel to the axis and they are spanned by the roll axis and roll radius and limited by the inner diameter and the outer diameter of the segment.

A roller press usually has two press rollers rotating in opposite directions. When briquetting or compacting, the granular bulk material is compacted between the rollers. For this purpose, the roller shell, which is composed of the segments, is equipped with pressing tools, which can have mold cavities for briquetting or compacting. The invention also includes press rolls with segments which are provided with another wear protection layer, e.g. B. for crushing Material. Particularly when hot briquetting or hot compacting, the press rolls are exposed to high temperatures due to the material to be processed, so that the segments themselves also assume high temperatures. This applies e.g. B. in the processing of reduced iron ores or sponge iron, in which the temperatures can be up to 900 ° C. At high temperatures, the segments or their pressing tools are usually subject to wear. In order to limit wear, such press rolls or their jackets are usually cooled, e.g. B. by water cooling. It has long been known, e.g. B. to integrate cooling channels in the clamping rings of the rollers.

Since the (tool) segments are usually subject to wear, they can be detached and are therefore exchangeably attached to the roll core. The fastening is carried out with the help of double-sided fastening rings, which are also referred to as clamping rings or clamping rings and which overlap the clamping shoulders of the segments on both sides. In practice, high demands are placed on the stability of these segments because they are subject to high loads.

A roller press for hot compacting and hot briquetting bulk goods with press rollers with segments is e.g. B. from the DE 25 36 670 A1 known. The segments are provided with shoulders or shoulders on which fasteners engage, with which the segments are fastened to the roll core. Foldable clamping brackets mounted on the roller core are provided as fastening means in this known embodiment, which are pressed against the segment via a tension bolt. Alternatively, cooled shrink rings, radially arranged screws or the like are proposed as fastening means.

The fastening of the segments with the aid of fastening rings or clamping rings which overlap the clamping shoulders of the segments is also from the document DE 43 44 206 A1 known. The clamping shoulders usually have the same cross-section over the entire circumferential area of the segment. The clamping bolts are arranged in the area of the end faces between two adjacent segments. For this purpose, suitable grooves are machined into the end faces, which receive the clamping bolts. The known embodiments have proven themselves in principle, but they can be further developed with regard to their stability and durability. - This is where the invention begins.

The invention has for its object to provide a press roll for a roll press of the type described above, which is characterized by a high stability and durability of the segments with a simple structure and simple assembly, so that long service life for the segments are guaranteed.

To achieve this object, the invention teaches in a generic press roll for a roll press of the type described at the outset that the segments on their end faces and / or clamping shoulders in the end face edge regions assigned to the end faces have external material reinforcements which are radial in relation to the first clamping surface and protrude outward in relation to the end face in the axial direction, so that a pocket-like recess is formed in the circumferential direction between two material reinforcements, the first clamping surfaces being arranged in the pocket-like recesses, against which second clamping surfaces of the fastening ring bear. It is advantageous if the fastening ring has a plurality of clamping projections distributed over the circumference, each assigned to a segment, which, for. B. have the first clamping surfaces and extend only over part of the circumference of a segment and engage in the pocket-like indentations of the segments. Each preferably has Segment has a pocket-like indentation and the clamping ring has a plurality of clamping projections, each segment being assigned a clamping projection. However, it is also within the scope of the invention that a segment has several pocket-like indentations and / or that several clamping projections are assigned to a segment or that several pocket-like protrusions are assigned to a pocket-like indentation.

The invention is based on the knowledge that the stability and thus the service life of the segments can be increased if the segments are specifically equipped with (external) material reinforcements. This consideration is based on the fact that the fastening ring does not necessarily have to be braced over the entire circumference with the segments, so that a locally limited bracing with the aid of e.g. B. the clamping projections described is sufficient. It is thus possible to equip the segments with additional material reinforcements and consequently thickenings, since no clamping surfaces have to be provided for bracing in these areas. In this way, the stability of the segments in particularly critical areas can be significantly improved, so that the service life is increased. The clamping ring consequently has a configuration in the sense of a crown ring with crown-like projections, which preferably protrude inwards in the radial direction (that is, in the direction of the roller axis) from the clamping collar and also inwards in the axis-parallel direction (that is, in the direction of the segment) from The clamping ring or its base ring protrude. With such a configuration, the material reinforcements described can now be implemented excellently, which do not impair the bracing and increase the stability of the segments.

The fastening ring is particularly preferably fastened in the sense of bracing by means of axially parallel clamping bolts, that is to say the The fastening ring is clamped against the segments using axially parallel clamping bolts. It can also be provided that the first clamping surfaces and / or the second clamping surfaces are oriented obliquely to the roller axis in order to generate a radial clamping force in the course of the clamping of the axially parallel clamping bolts. The clamping shoulders consequently have first clamping surfaces in a generally known manner and the clamping ring also has second clamping surfaces in a known manner, i.e. the clamping surfaces of the clamping ring press the clamping surfaces of the clamping shoulders during assembly, so that the segments are clamped on the roller core. Due to the inclined surfaces, the clamping forces applied in the axis-parallel direction are consequently increased to radial forces, so that a perfect fixation of the segments on the roller core is guaranteed. In addition to this non-positive connection, however, it is preferably provided that the segments are also held in a form-fitting manner on the roller core. For this purpose, the segments on the inner circumferential side and the roller core on the outer circumferential side can have suitable positive locking elements (projections and recesses), so that, for. B. a tongue and groove connection between segments and roll core is realized. According to a further proposal of the invention it is provided that the segments each have at least one axially parallel opening for the clamping bolt, which is arranged in relation to the extent in the circumferential direction between the two end faces of the segment, for. B. in the middle between the two end faces. The invention is based on the knowledge that the stability and thus the service life of the segments can be increased further if the clamping bolt, with which the two fastening rings are braced against one another with the interposition of the segments, not in the area of the end faces and consequently between two on top of one another following segments are arranged, but if an opening for the clamping bolt is integrated into the segment, for. B. in the middle between the two end faces is arranged, based on the extent in the circumferential direction. The result of these optional measures is that no axially parallel grooves, protrusions or the like need to be formed in the end faces of the segments, which receive a clamping bolt in the assembled state. These measures prevent possible weak points in the segments, in particular in the area of the end faces, so that the stability of the segments is further increased. The introduction of the axially parallel openings z. B. succeeds as a hole with simple technical means, without affecting the stability of the segment. Simple bracing is also possible in this way. Alternatively, embodiments are also detected in which the clamping bolts are arranged between the segments in a conventional manner.

The material reinforcements described at the outset, which are essential to the invention, are preferably arranged on both sides of the opening (for the clamping bolt), so that the opening is preferably arranged between the material reinforcements in the region of the pocket-like indentation. The clamping ring described consequently acts with its clamping projections preferably only in a central region on the segments, the clamping bolts also being positioned in this central region.

The fastening ring (tensioning ring) preferably has a tensioning collar with the second tensioning surfaces which overlaps the tensioning shoulder of the segments and which is tensioned against corresponding first tensioning surfaces of the tensioning shoulders of the segments. The clamping projections are arranged on the clamping collar and they preferably protrude inwards in the radial direction from the clamping collar and inwards in the axis-parallel direction inwards from the clamping ring or a base ring of the clamping ring.

As described, the fastening rings are preferably clamped using clamping bolts. However, the configuration according to the invention with the described material reinforcements and the pocket-like indentations of the segments arranged in between can alternatively also be realized with fastening rings which are fixed by shrinking in the sense of a thermal cross-bond. The invention consequently also includes those embodiments in which the fastening ring is shrunk onto the segments or their clamping shoulders.

Another proposal of the invention relates to the design of the end faces of the segment. It has already been explained that grooves or the like for guiding the tensioning bolts can be dispensed with in the region of the end faces. Nevertheless, a certain contour of the end surfaces can be expedient, namely to increase the arc length of the contact surface between the segment and the core and thus to reduce the risk of tipping over under asymmetrical load. So the one end face of the segment z. B. a nose and the other end face of the segment on a corresponding pocket, the nose of a segment engaging similar to a tongue and groove connection in a corresponding pocket of the adjacent or following segment. In this way, an extended footprint of the segments on the core is realized. This configuration, which is similar to a tongue and groove connection, essentially relates to the central region of the end face. The end faces are consequently flat and consequently stepless in the end face edge regions assigned to the end faces, that is to say on both sides of the nose / pocket over the entire radial thickness of the segment and in the radial direction above the lugs / pockets over the entire axial thickness of the segment. Such an essentially flat / stepless configuration of the edge regions of the End areas are avoided weak spots and thus a particularly stable structure is realized.

The invention also relates to a roll press with two press rolls of the type described. The press rolls which are essential to the invention are therefore particularly preferably protected in combination within a roll press. Such a roller press can preferably be designed for briquetting and / or compacting granular material, in particular for hot briquetting / hot compacting.

Fig. 1

eine schematisch vereinfachte Darstellung einer Presswalze in einer perspektivischen Ansicht,

Fig. 2

einen perspektivischen Ausschnitt aus dem Gegenstand nach Fig. 1,

Fig. 3

den Gegenstand nach Fig. 2 in einer Seitenansicht,

Fig. 4

ein erfindungsgemäßes Segment der Presswalze nach Fig. 1 in einer perspektivischen Darstellung,

Fig. 5

eine stirnseitige Seitenansicht des Gegenstandes nach Fig. 4.

The invention is explained in more detail below on the basis of a drawing illustrating only one exemplary embodiment. Show it:

Fig. 1

a schematic simplified representation of a press roller in a perspective view,

Fig. 2

a perspective section of the subject Fig. 1 .

Fig. 3

the subject Fig. 2 in a side view,

Fig. 4

an inventive segment of the press roll after Fig. 1 in a perspective view,

Fig. 5

an end side view of the object Fig. 4 ,

Fig. 1 shows a press roller for a roller press, in particular for briquetting or compacting and particularly preferably for hot briquetting or hot compacting of granular material. Such a press roller consists in its basic structure of a roller core 1 and a roller shell attached to the roller core 1, which is composed of several segments 2 distributed over the circumference, these segments having 2 axially parallel end faces 3. The segments 2 can be profiled on the outer circumference side; in the exemplary embodiment, they have molded troughs 4 for briquetting or compacting. These molding tools / molding troughs 4 are integrated in one piece / in one piece into the respective segment 2. Each segment 2 has a clamping shoulder 5 running around the end face.

The segments 2 are fastened to the roll core 1 with the aid of two fastening rings 6, which are also referred to as clamping rings or tension rings. They are in Fig. 2 shown. The two fastening rings 6 are placed on both sides of the end face so that they overlap the clamping shoulders 5 of the segments 2. The two fastening rings 6 are braced against one another by means of axially parallel clamping bolts 7 and thus also against the segments 2 arranged between the fastening rings. The clamping shoulders 5 have first clamping surfaces 8 and the clamping ring 6 has second clamping surfaces 9. In order to be able to generate a radial clamping force in the course of clamping the axially parallel clamping bolts 7, the first clamping surface 8 and the second clamping surface 9 are oriented obliquely to the roller axis. The axial or axially parallel clamping force applied with the aid of the clamping bolts 7 is consequently increasingly deflected into a radial clamping force, so that a perfect fastening of the segments 2 on the roller core 1 is ensured. In this case, a positive connection between the segments 2 and the roll core 1 can also be realized by z. B. engage inside circumferential (or underside) form-locking elements of the segments 2 in the outer circumferential form-locking elements of the roller core 1 (and / or vice versa). In any case, the bracing comes Segments 2 with the aid of the fastening ring 6 and the clamping bolt 7 are of particular importance in the context of the exemplary embodiment shown. The fastening ring 6 is designed as a ring with a profiled cross section. It has a circumferential base ring 6a on the one hand and a circumferential tension collar 6b on the other hand, so that it has an essentially L-shaped cross section. This circumferential clamping collar 6b overlaps the clamping shoulders 5 of the segments 2 with the second clamping surfaces 9, so that the second clamping surfaces 9 of the clamping ring 6 are pressed against the first clamping surfaces 8 of the clamping shoulders 5.

The segments 2 each have an axially parallel opening 10 through which the clamping bolts 7 are passed. These axially parallel openings 10 are each arranged between the two end faces 3 of a segment 2 in relation to the extent in the circumferential direction. In the exemplary embodiment, the opening 10 of a segment 2 is arranged centrally with respect to the extent in the circumferential direction between the two end faces 3 of this segment. The openings 10 are designed as bores and they extend over the entire width of the segments 2, so that the clamping bolts completely penetrate the segments. In this way, the two fastening rings 6 can be braced on both sides of the segments with the interposition of the segments 2.

In the exemplary embodiment, the clamping ring 6 is not formed with a constant cross section over the entire circumference, but the clamping ring 6 has locally limited clamping projections 11. The clamping ring 6 consequently has a plurality of clamping projections 11, each assigned to a segment 2, distributed over the circumference, wherein these clamping projections 11 each have the second clamping surfaces 9. The clamping projections 11 consequently extend only over part of the arc length of a segment 2, so that the force is introduced of the clamping ring 6 does not take place over the entire circumference (or over the entire area), but only locally limited in the area of the clamping projections 11.

The segments 2 have outer material reinforcements 13 on their end faces 12 and their tensioning shoulders 5 (or in the transition area between the end face 12 and tensioning shoulder 5). These material reinforcements 13 project outwards in relation to the first clamping surface 8 in the radial direction and in relation to the end surface 12 in the axial direction, so that a pocket-like indentation 14 is provided in the circumferential direction between two material reinforcements 13 of a segment 2. The first clamping surfaces 8 of the segments 2 are arranged in these pocket-like indentations 14, i. H. the clamping ring 6 engages with its locally limited clamping projections 11 in these pocket-like indentations 14 of the segments. The material reinforcements 13, which are arranged in the end face edge regions of the segments 2 assigned to the end faces, consequently do not disturb the correct bracing. They ensure an increase in stability in the area of the segment that is subject to particularly high stress. The clamping ring 6 is consequently formed like a crown. In the area of these locally limited clamping projections 11, the second clamping surface 9 is realized on the underside, this second clamping surface 9 as well as the first clamping surface 8 of the segments 2 being arranged obliquely with respect to the roller axis within the pockets 14.

Moreover, it can be seen in the figures that two segments arranged one behind the other in the circumferential direction interlock. For this purpose, the one end face 3 of a segment 2 has a nose 15 projecting in the circumferential direction, while the opposite end face 3 of the same segment 2 has a corresponding pocket 16 that recesses in the circumferential direction, so that the nose 16 of a segment resembles a tongue and groove connection in FIG the corresponding pocket 16 of the circumferential direction engages adjacent segment. Apart from these elements (lugs 15 / pockets 16), the end faces 3 are flat or planar and consequently stepless. In particular, there is no need for profiles for the tensioning bolts or tensioning rods 7, since according to the invention these tensioning bolts are guided through central openings in segment 2. In this way, the end faces 3, in particular in the end face edge regions assigned to the end faces, namely on both sides of the lugs and pockets over the entire radial thickness of the segment and in the radial direction above the lugs / pockets over the entire axial thickness of the segment, are flat and consequently stepless be formed. In this way, notches and protrusions are avoided, which contributes to increasing the strength and durability of the individual segments.

In the figures, an embodiment is shown in which the fastening ring 6 is clamped against the segments 2 by means of clamping bolts 7. However, the invention also includes embodiments in which the fastening ring is shrunk onto the segments or their clamping shoulders. This is not shown in the figures.

Claims (11)

1. Press roller for a roller press, more particularly for the briquetting, compacting or grinding of granular material,
   with a roller core (1) and, circumferentially fastened on the roller core 1, a roller shell, which is composed of a plurality of segments (2) distributed over the circumference with end surfaces (3) facing each other,
   wherein frontally the segments (2) comprise circumferential clamping shoulders (5) with first clamping surfaces (8) and
   wherein frontally the segments (2) are each detachably fastened to the roller core (1) with a fastening ring (6) which spans the clamping shoulders (5) of the segments (2),
   characterised in that on their front surfaces (12) and/or clamping shoulders (5) the segments (2) comprise, in the front surface edge areas facing the end surfaces (3), outer material reinforcements (13) which protrude outwards in the radial direction in relation to the first clamping surface (8) and in the axial direction in relation to the end surface (12), so that in the circumferential direction between each two material reinforcements a pocket-like indent (14) is formed, wherein in the pocket-shaped indents (14) the first clamping surfaces (8) are arranged, abutting which are second clamping surfaces (9) of the fastening ring (6).
2. Press roller according to claim 1 characterised in that the fastening ring (6) is shrunk onto the segments (2) and/or the clamping shoulders (5).
3. Press roller according to claim 1 characterised in that the fastening ring (6) is clamped against the segments (2) by means of axially parallel clamping bolts (7).
4. Press roller according to any one of claims 1 to 3 characterised in that in order to produce a radial clamping force, e.g. during the course of clamping the axially parallel clamping bolts (7) or during the course of shrinking on, the first clamping surfaces (8) and/or the second clamping surfaces (9) are orientated obliquely to the roller axis.
5. Press roller according to any one of claims 1 to 4 characterised in that the fastening ring (6) comprises several clamping projections (11) distributed over the circumference which are each assigned to one segment (2) and, for example, comprise the first clamping surfaces (8) and only extend over a part of the arc length of a segment (2) and engage in the pocket-like indents (14) of the segments (2).
6. Press roller according to any one of claims 3 to 5 characterised in that the segments (2) each have at least one axially parallel aperture (10) for the clamping bolts (7), which in relation to the extent in the circumferential direction is arranged between the two end surfaces (3) of the segment, e.g. centrally between the two end surfaces.
7. Press roller according to any one of claims 3 to 6, characterised in that the material reinforcements (13) are arranged on both sides of the aperture (10) so that the aperture (10) is arranged between the material reinforcements (13) in the area of the pocket-like indent (14).
8. Press roller according to any one of claims 1 to 7 characterised in that spanning the clamping shoulder (5) of the segments (2), the fastening ring (6) comprises a clamping collar (6b) with the second clamping surfaces (9) which are clamped against corresponding first clamping surfaces (8) of the clamping shoulders (5) of the segments (2).
9. Press roller according to any one of claims 1 to 8 characterised in that the clamping projections (11) are arranged on the clamping collar (6b) and preferably in the radial direction project inwards from the clamping collar (6b) and in the axially parallel direction project inwards from the clamping ring (6) or a base ring (6a) of the clamping ring (6).
10. Press roller according to any one of claims 1 to 9 characterised in at that at least one cooling channel is integrated into the fastening ring.
11. Roller press with two press rollers according to any one of claims 1 to 10.

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