EP2874805A1

EP2874805A1 - Press roller

Info

Publication number: EP2874805A1
Application number: EP13732194.9A
Authority: EP
Inventors: Axel HÖFTER; Kai-Uwe Habermann
Original assignee: Maschinenfabrik Koeppern GmbH and Co KG
Current assignee: Maschinenfabrik Koeppern GmbH and Co KG
Priority date: 2012-07-18
Filing date: 2013-06-28
Publication date: 2015-05-27
Anticipated expiration: 2033-06-28
Also published as: KR20150060671A; WO2014012770A1; RU2015105333A; RU2632343C2; JP2015522424A; SI2874805T1; US10518268B2; DE102012106527A1; DE102012106527B4; KR102038729B1; MY174499A; MX357778B; EP2874805B1; US20150136884A1; MX2015000220A; JP6228603B2

Abstract

The invention relates to a press roller for a roller press, in particular for briquetting, compacting or grinding granular material, having a roller core (1) and a coolable casing (2) fastened to the roller core (1), wherein a plurality of cooling ducts (6), which are distributed over the circumference and extend in an axially parallel manner, are arranged in the casing (2) beneath the casing surface, said cooling ducts (6) being connected to an axial central duct (8) in the roller core (1) via radially extending inlet and outlet ducts (7), wherein at least two distributor rings (10) that are each connected at their ends to the casing (2) are arranged on the roller core (1), annular ducts (11) that extend in the circumferential direction being arranged in said distributor rings (10), said annular ducts (11) being connected at one end to the radial inlet and outlet ducts (7) and at the other end to the axially parallel cooling ducts (6). To be published with Figure 3.

Description

press roll

Description:

The invention relates to a press roll for a roll press, in particular for briquetting, Konppaktieren or grinding of granular material, with a roll core and attached to the roll core cooled or coolable bandage.

A roll press usually has two counter-rotating press rolls. When briquetting or compacting the granular bulk material is compacted between the rollers. For this purpose, the bandage outside circumference usually with pressing tools, z. B. mold troughs for briquetting or compacting equipped. But the invention also includes press rolls with bandages, which are provided with a different wear protection layer, for. B. for the (high pressure) crushing of material.

In particular during hot briquetting or hot compacting, the press rolls are exposed to high temperatures by the material to be processed, so that the bandages themselves also assume high temperatures. This applies z. As in the processing of reduced iron ore or sponge iron, in which the temperatures can be above 900 ° C. At high temperatures, the bandages and in particular the press tools attached to them (eg mold cavities) are generally subject to high wear. To limit the wear, it has been proposed to cool the press rolls or their bandages, z. B. by means of water cooling.

Thus, in the patent DE 1 029 723 a press roll for a briquetting press was described, which consists of a hollow roll body and a mold bandage, wherein the cylindrical roll shell on its circumference in the region of the shrunk-on mold bandage with a schraubenför-

Migen groove is provided, which forms a cooling or Heizmittelkanal together with the mold bandage. The cooling channels are therefore arranged as it were between the roll core and bandage. The same applies to a press roll described in German Patent DE 809 546 with a roll shell shrunk onto a roll core, in which the channels are formed as grooves on the surface of the axis bale which open on each side into an annular space with bores to the axial center.

A press roll with cooling is incidentally known from DE 25 36 670 A1. In this embodiment, a cooling of the roller core via a plurality of axially parallel cooling channels, which are integrated into the roller core itself. The shell of the roll consists of a plurality of circumferentially adjacent with axially parallel longitudinal edges and releasably connected at their ends with the roll core segments.

In order to reduce the cooling of the pressing tools and thus the wear of the pressing tools has also been proposed to integrate into the jacket itself axially parallel cooling holes, which are connected to channels for supplying and discharging a cooling medium in the roll core (see DE 25 36 668 A1) , In this embodiment too, the jacket is formed by a plurality of segments which are detachably fastened to the core. The introduced into the segments axis-parallel cooling channels are connected to the introduced into the roll core radial bores via suitable connecting means, for. B. manifold connected. Alternatively, it is proposed to connect the cooling channels all or in groups to one or more ring lines, which is then connected to a radial inlet or outlet bore in the roll core. In practice, this must also have separate pipes, steel corrugated hoses or the like

be realized, especially since a jacket of several segments is used.

A press roller of the type described above is z. B. from DE 198 33 456 A1. In this case, deflecting or distribution rings are fixed laterally on the bandage, which sit directly on the end faces of the bandage. The deflection or distribution rings have on their the bandage end face associated with circumferential circumferential grooves that distribute the Kühlmed ium over the entire kring from the Umlen end face region of the bandage. The deflection or distribution rings are each connected via separate pipe connections with the radial inlet and outlet channels.

Based on the known prior art, the invention is the technical problem of providing a press roll for a roller press of the type described above, which is characterized by an improved cooling concept.

To solve this problem, the invention teaches a press roll for a roll press, comprising a roll core and a cooled or coolable bandage affixed to the roll core, wherein a plurality of circumferentially distributed within the bandage below the (outer) bandage surface (ie the working surface) , Running axially parallel cooling channels are incorporated, which are connected via radially extending inlet and outlet channels with an axial central channel in the roll core, wherein on the roll core at least two each end face connected to the bandage distributor rings are arranged, in which in the circumferential direction

extending annular channels are arranged, which are connected (each directly) on the one hand with the radial inlet and outlet channels and on the other hand with the axis-parallel cooling channels. Such a press roll is intended in particular for briquetting or compacting and more preferably for hot briquetting or hot compacting. The invention also includes press rolls for other purposes, eg. B. for crushing or grinding of granular material. The invention is initially based on the knowledge that an effective cooling is achieved by arranged within the drum cooling channels. The cooling channels are consequently arranged very close to the bandage surface or close to the pressing tools and / or wear protection layers arranged on the bandage, so that the cooling is realized where the heat is also supplied. Such effective cooling leads in particular to longer service life and lower maintenance costs, because the wear of the bandage or the pressing tools arranged thereon is considerably reduced. In addition, due to the cooling of the bandage, it is possible to properly fasten the preferably integrally formed and completely circumferential (ring) bandage on the roll core, in particular by thermal shrinking. The risk that the shrunk-on bandage will detach from the roll core due to heating no longer exists. Finally, the cooling improves the performance of the roller press, because overall it is possible to work with higher throughputs without increasing the tool temperature. Furthermore, by the cooling and the voltage-optimized design damage, z. B. avoided by cracking. These advantages are achieved according to the invention, in particular also in a simple manufacturing technology, by virtue of the fact that at least two distributor elements, each connected to the bandage at the end face, are produced.

rings are provided, in which circumferentially extending annular channels are arranged, which are connected on the one hand with the radial inlet and outlet channels and on the other hand with the axis-parallel cooling channels. The distributor rings with the integrated ring channels ensure a perfect distribution of the cooling medium, eg. As the cooling liquid, preferably water or the like. In the course of production can be dispensed with the use of expensive piping systems, steel corrugated hoses or other fasteners. Because of the separately manufactured distributor rings, in which the ring channels are integrated, there is a perfect distribution of the cooling medium. The cooling medium passes from the central channel via the inlet and outlet channels oriented in the radial direction into the distributor ring and is there distributed via the annular channel to the individual axis-parallel cooling channels.

According to the radial inlet and outlet channels on the one hand and the axially parallel cooling channels on the other hand connected via the distributor rings, namely waiving separate piping systems, steel corrugated hoses or the like. This gel ingt z. B. in that the distributor rings are connected directly to the bandage and to the roll core with the interposition of seals. For this purpose, it is provided that the distributor rings are each arranged in the region of the radial inlet and outlet channels on the roller core, so that they cover the radial inlet and outlet channels. In an axial section through the roller, the distributor rings fastened on both sides of the bandage consequently extend beyond the radial inflow and outflow channels, so that the distributor rings are directly interposed with seals and without the use of separate tube rings, corrugated steel tubes or The like, can be attached to the roll core and connected to the radial inlet and outlet channels. The seals between distributor ring and roll core are particularly preferably annular sealing elements, for. B. O-rings. At the seals

between distributor ng and bandage are particularly preferably flat gaskets.

The embodiment of the invention is characterized by a particularly simple structure and optimized cooling. The absence of separate connecting pipes or the like makes it possible to fully exploit the roll width, so that you can work with wider bandages or segments. As a result, the cooling is also optimized so that, surprisingly, the distributor rings can be connected to the roll core directly, with the interposition of suitable seals, despite the high temperatures without the need for, for example, B. corrugated hoses are required.

The distributor rings are particularly preferably designed in each case as completely circumferential, one-piece distributor rings, for. B. steel. The required channels can be introduced by machining in the distribution rings. These separate distribution rings also have the advantage that they can be used multiple times regardless of the bandage, z. For example, if the bandage has to be exchanged after wear. So there is z. B. the ability to fasten the distributor rings only on the bandage (and not on the roll core), z. B. releasably by means of screw.

In terms of manufacturing technology, the distributor ring can be produced in a particularly simple manner if inner circumferential grooves are provided in the distributor rings, which extend in the inner circumferential direction over at least part of the inner circumference and which form the annular channels with the roll core in the mounted state of the distributor ring. It is therefore not necessary to integrate the ring channels "completely" in the distribution rings, but manufacturing technology

It is easy to introduce open grooves on the inner peripheral side, so that the annular channels then ultimately arise in the course of assembly, wherein the annular channels are then bounded on one side by the surface of the roller core. It is expedient to connect the distributor rings with the interposition of seals to the drum and / or to the roll core. Preferably, both seals between the bandage and distribution ring on the one hand and bandage and roll core on the other hand are provided. A seal between distributor ring and roller core is particularly useful when the ring channels are formed by the grooves described. Seals between distribution ring and bandage are advantageous because the annular channel is connected via corresponding connecting channels to the individual cooling channels, said connecting channels z. B. may be formed as deflection channels. As seals z. As graphite gaskets or graphite laminate gaskets are used.

It is within the scope of the invention that in each distribution ring only a single, over the entire circumference completely encircling annular channel is integrated. This has the advantage that only one radial inlet or Abiaufbohrung is then required for each distribution ring, so that the stability of the roll core is only minimally affected. According to a preferred embodiment, however, a plurality of annular channels can be incorporated in each distribution ring, each not over the entire circumference, but over a certain circumferential angle of z. B. extend 90 ° to 180 ° and the respective separate supply and discharge channels are connected to the central channel. So z. B. are worked with two ring channels per distribution ring, each extending over a circumferential angle of 180 °. Such an embodiment has the advantage that the distribution of the cooling medium in particular under the aspect of a uniform distribution and thus a homogeneous

optimized cooling performance. In such an embodiment with z. B. two ring channels then only two feed channels and two discharge channels are required, so that also can be used with relatively little holes in the roll core. In principle, the homogeneous cooling distribution could be optimized by a further division into a large number of annular channels. However, this could then affect the stability of the roller due to the then required plurality of radial bores, so that it is preferable to work with no more than four ring channels or channel sections per distributor ring.

In order to improve the distribution of the cooling medium and to realize the most homogeneous possible cooling, according to a further proposal of the invention, it is expedient to integrate throttling devices in the cooling channels or in some cooling channels which reduce the flow cross section of individual cooling channels by a predetermined amount. The invention is based on the recognition that it is first of all sensible in terms of manufacturing technology to manufacture all cooling channels with the same cross-section. Depending on the geometry of the annular channel and in particular the position of the feed channels, however, an inhomogeneous cooling may then occur since, starting from the radial feed channel, not all cooling channels are uniformly supplied with cooling liquid. This fact can be taken into account in a preferred embodiment of the invention in that some cooling channels are provided with suitable throttling devices. These are preferably simple diameter reductions z. B. can be realized by the use of suitable ring elements or diaphragms, which are integrated into the cooling channels or assigned to the cooling channels. Preferably, these elements or panels are not integrated directly into the cooling channels, which are arranged directly in the bandage, but in the adjoining sections in the distributor rings. This can be done in advance by

corresponding calculations and particularly preferably determine by appropriate experiments, which cooling lines are to be provided with corresponding throttle devices or which throttle devices are to be provided for a corresponding cooling capacity, quite different throttle devices can be used in different cooling lines. So it may be appropriate to realize diameter reduction in individual cooling lines by more than 20%, possibly even more than 40%. In any case, with the help of appropriate throttling devices, an overall perfect, homogeneous cooling can be realized, even if working with only one or two annular channels per distributor ring.

The distributor ring is preferably made of steel. The same usually applies to the roll core. The bandage can be made of steel, wherein the pressing tools arranged on the bandage and the wear layer are preferably made by powder metallurgy and fixed to the bandage, z. B. by hot isostatic pressing (HIP). The cooling channels essential to the invention are therefore particularly preferably used in a bandage whose pressing tools and / or wear protection layer are powder-metallurgically, for. B. by hot isostatic pressing, is produced.

The invention is preferably realized in a one-piece, completely encircling ring bandage. This is preferably shrunk onto the core. The invention also includes other types of attachment, eg. B. gluing or by means of feather keys.

In the following the invention will be explained in more detail with reference to a drawing showing only one exemplary embodiment. Show it:

2 shows a simplified axial section (in another sectional plane), the article according to FIG. 1 in a "partially broken" view and a partial section through the article according to FIG. 1 in FIG another view.

1 shows a press roll for a roll press, in particular for briquetting or bonding, 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 fixed drum 2 on the drum 2. The roller core 1 is formed integrally with a shaft 3 which is rotatably supported by bearings 5 in a machine frame, not shown. The bandage 2 is formed as a completely encircling, one-piece ring bandage, the z. B. is fixed by thermal shrinkage on the roll core 1. Externally circumferential side of the bandage 2 is equipped with pressing tools 4, the z. B. may be formed as mold cavities for briquetting or compacting. This pressing tool 4 is merely indicated in the figures. The bandage 2 is z. B. made of steel, wherein the pressing tools 4 as wear layer z. B. produced by powder metallurgy and applied to the bandage 2, z. B. by hot isostatic pressing. In this way, a

lumped bandage 2 produced with integrated tools or mold cavities.

According to the press roll with a liquid cooling, for. B. water cooling, equipped. For this purpose, a plurality of distributed over the circumference, axially parallel cooling channels 6 are integrated into the bandage 2 below the bandage surface or below the tools 4, which extend parallel to the axis. It can be seen that these axially parallel cooling channels 6 are not integrated into the roll core 1 but into the bandage 2, so that a particularly effective cooling of the roll surface or of the tools 4 takes place. These axially parallel cooling channels are connected via radially extending inlet and outlet channels 7 with an axial central channel 8 in the roll core 1. This central channel 8 is connected via a suitable rotary feedthrough with a Flüssigkeitsseinlass- and -auslasseinrichtung 9, which is attached laterally to the roller shaft 3.

According to the distribution of the cooling medium via two each end face connected to the bandage distribution rings 10. It is made separately, completely encircling, one-piece distribution rings 10, the z. B. can be made of steel and are connected to the side of the bandage 2. In each of these distributor rings 10, one or more annular channels 1 1 are integrated, which extend along the circumferential direction of the distributor rings 10 and which are connected on the one hand with the radial inlet and outlet channels 7 and on the other hand with the axis-parallel cooling channels 6. Consequently, a simple distribution of the cooling medium takes place via these separate distributor rings 10. One of the rings 10 forms a distributor ring, through which the liquid is distributed and the other opposing ring forms a collector ring as it were. The term "distributor ring" thus also includes its collection function.

In the figures, it can be seen overall that the radial inlet and outlet channels 7 on the one hand and the axially parallel cooling channels 6 on the other hand are connected exclusively via the distributor rings 10, dispensing with separate pipeline systems or steel corrugated hoses. For this purpose, the distributor ring 10 is sealed with the interposition of seals 14, 15 on the one hand against the bandage 2 and on the other hand against the roller core 1. The distributor rings 10 are each arranged in the region of the radial inlet and outlet channels 7 on the roll core 1, so that the distributor rings 10 cover the inlet and outlet channels 7 as it were. In this way, almost the entire roller width can be utilized for the bandage 2.

The seals 14, 15 are formed as annular seals. Between distributor ring 10 and bandage 2 two perforated gaskets 14 are provided, and preferably a flat gasket 14 per distributor ring 10. Between distributor ring 1 0 and roller core 1 are each provided two annular Dichtu lengths, which preferably have an identical diameter, the two seals 15 are arranged on both sides of the corresponding radial inlet and outlet channel 7. These seals 15 may be z. B. act to O-rings.

It can be seen in particular in FIGS. 3 and 4 that the annular channels 1 1 integrated into the distributor rings 10 are connected to the individual cooling channels 6 via a multiplicity of connecting channels 12, wherein these connecting channels 12 are designed as deflection channels 12 in the exemplary embodiment themselves composed of a radially oriented channel section 12a on the one hand and on the other hand an axially parallel channel section 12b, wherein the radial channel sections 12a are connected in a star shape to the annular channels 1 1 and wherein the axially parallel channel sections 12b in

the cooling channels 6 open and the cooling channels 6 ultimately continue in the axis-parallel direction.

In the exemplary embodiment, for realizing the annular channels 11, grooves 13 are provided in the distributor rings 10, which extend in the inner circumferential direction over at least part of the inner circumference and which form the annular channels 11 in the installed state of the distributor ring 10 with the roller core 1 , This results z. B. in FIGS. 2 and 5. In particular, in FIG. 5, the groove 13 can be seen, which is introduced on the inside circumference in the distribution ring 10, z. B. by machining. This groove 13 forms, together with the outer circumference of the roller core 1, the annular channel 1 1. It is shown in Figs. 3 and 5 indicated that in these embodiments, both between distributor ring 10 and bandage 2 and between distributor ring 10 and roller core 1, the seals 14, 15 are arranged. Fig. 2 shows, moreover, that the distributor rings 10 are releasably secured to the bandage 2, by means of screw connections. These are suitable openings, z. B. bores 16 are introduced into the distributor rings 10 through which corresponding screws 17 can be introduced into the bandage. In a separate attachment of the distributor rings 1 0 to the roll core 1 can be omitted. Particularly advantageous is the fact that the distributor rings 10 can be used multiple times regardless of the bandage, z. 4 shows, moreover, that in each distribution ring 10 not only a single completely encircling annular channel 1 1 is integrated, but that in each distribution ring 10 each two ring channels 1 1 are integrated, each extend (only) over a circumferential angle of 180 °. Each of these ring channels 1 1 is via a (single) inlet channel or outlet channel 7 with the central channel. 8

connected. The realization of two separate ring channels and consequently two separate cooling systems improves the distribution of the cooling medium. Nevertheless, it is not necessary to introduce a plurality of radially extending channels in the core, so that a stable design is ensured.

Basically, there is a need to achieve distributed over the circumference homogeneous cooling. This assumes that the individual cooling channels 6 are uniformly charged with the cooling medium or are flowed through uniformly by the cooling medium. If - as shown in the figures - is worked with a circumferential area over a large peripheral annular channels 1 1, the flow rate in the individual cooling channels may be uneven. Thus, there is the possibility that individual cooling channels 6 are flowed through more strongly with the cooling medium than other cooling channels. Against this background, it may be advantageous to integrate throttling devices into individual cooling channels 6 during the production of the roller or during the production of the bandage and / or the distributor rings, or to allocate throttle devices to these cooling channels. It can be simply mechanical diameter reductions. Manufacturing technology, this can be easily z. B. realize that are used or incorporated into the distributor rings, namely in the axial portions 12 b of the connecting channels 12, throttle elements, which have a smaller diameter than the cooling channels 6. This can be in advance z. B. by experiments, so that distributor rings are produced, which are characterized by an improved distribution of the cooling medium. In the figures, these throttle devices, the z. B. may be formed as diaphragms, not shown.

To simplify the installation, it may be appropriate to provide the core and the distributor rings mounting marks 18, z. B. grooves or other markings that are aligned in the direction of rotation.

Claims

claims:

1 . Press roll for a roll press, in particular for briquetting, bonding or grinding of granular material, comprising a roll core (1) and a roll core (1) mounted coolable bandage (2), wherein in the bandage (2) below the bandage surface more than the circumference distributed, axially parallel cooling channels (6) are arranged, which are connected via radially extending inlet and outlet channels (7) with an axial central channel (8) in the roll core (1), wherein on the roll core (1) at least two each end face arranged on the bandage (2) distributor rings (10) are arranged, in which circumferentially extending annular channels (1 1) are arranged, which are connected on the one hand with the radial inlet and outlet channels (7) and on the other hand with the axis-parallel cooling channels (6) , characterized in that the radial inlet and outlet channels (7) on the one hand and the axis-parallel cooling channels (6) on the other hand via the Verteilerrin ge (10) waiving piping systems or steel corrugated hoses are connected.

2. Press roll according to claim 1, wherein the bandage (2) is designed as a completely encircling, one-piece annular bandage.

3. Press roll according to claim 2, wherein the bandage (2) by means of shrink fit on the roll core (1) is fixed.

4. Press roll according to one of claims 1 to 3, wherein the bandage (2) on the outer peripheral side with pressing tools (4) and / or a wear protection

is simply equipped, z. B. with mold cavities for briquetting or compacting.

5. Press roll according to claim 4, wherein the pressing tools (4) and / or the wear protection layer made by powder metallurgy and powder metallurgy is attached to the bandage / are, for. B. by hot isostatic pressing.

6. Press roll according to one of claims 1 to 5, wherein the distributor rings (10) are each formed as a completely encircling, one-piece distributor rings.

7. Press roll according to one of claims 1 to 6, wherein in the distributor rings (10) inner peripheral side grooves (13) are introduced, which extend in the inner circumferential direction over at least part of the inner circumference and which in the mounted state of the distribution ring (10) the roller core (1) form the annular channels (1 1).

8. Press roll according to one of claims 1 to 7, wherein the distributor rings (10) u nter Zwischenschaltu ng of Dichtu (1 4, 1 5) z. B. annular seals are connected to the drum (2) and / or to the roller core (1).

9. Press roll according to one of claims 1 to 8, wherein in each distributor ring (10) a plurality of annular channels (1 1) are incorporated, the z. B. extend over a circumferential angle of 90 ° to 180 ° and which are each connected via separate inlet and outlet channels (7) to the central channel (8).

10. Press roll according to one of claims 1 to 9, wherein the distributor rings (10) are releasably secured to the bandage (2), for. B. by means of screws (17).

1 1. Press roll according to one of claims 1 to 10, wherein at least some cooling channels (6) throttle means are associated, which reduce the flow cross-section of individual cooling channels (6) by a predetermined amount.

12. Press roll according to one of claims 1 to 1 1, characterized in that the distributor rings (10) in each case in the region of the radial inlet and outlet channels (7) on the roll core (1) are arranged, so that they the inlet and outlet channels (7) cover.