EP0879106A1

EP0879106A1 - Supporting roll stand for continuous casting plants for metal, in particular steel

Info

Publication number: EP0879106A1
Application number: EP97917218A
Authority: EP
Inventors: Hans-Werner Gohres; Franz-Josef Divjak; Rainer Lenk
Original assignee: Mannesmann AG
Current assignee: Vodafone GmbH
Priority date: 1996-02-08
Filing date: 1997-01-30
Publication date: 1998-11-25
Anticipated expiration: 2017-01-30
Also published as: WO1997028916A1; EP0879106B1; DE19606308C1; DE59700884D1

Abstract

The invention relates to a supporting roll stand for continuous casting plants for metal, in particular steel. The invention is characterised in that the roll carriers are in the form of a rigid frame members (1, 2) constituted of welded plates, and both frame members (1, 2) have a projecting extension (19, 19', 20, 20') at each end. A plate-welded side member (15, 16) is fitted in each case between said extensions and is detachably connected via neck-down bolts to the two frame members (1, 2). The rigid and torsion-resistant support roll segment so formed has smooth and flat inner surfaces (21, 22), and the two frame members (1, 2) are provided with two carriers (12, 12', 30, 30') each extending at a distance from the width of the roll to form a T-shape in the casting direction and to which the corresponding pivot bearing housing (31) is detachably secured. The plate-welded assembly of the frame members (1, 2) and the side members (15, 16) are composed of the most similar individual segments according to a modular design, and the connecting members are to the greatest extent identical. A corrosion-resistant material is used for all parts of the supporting roll segment including the connecting members.

Description

description

Support roller stand for metal, especially steel continuous casting plants

The invention relates to a support roller frame for metal, in particular continuous steel casting systems according to the preamble of the main claim.

A generic support roller frame is known from DE-AS 19 65 115. This support roller structure is divided into straight or curved segments, with several rollers being combined on a roller carrier. Two roller carriers each for parallel strand sides are attached to stands running on both sides next to the cross section of the casting strand. At least one of the roller carriers can be adjusted against the other in guides of the stand by means of hydraulic piston engines provided in pairs. Both roller carriers can be expanded independently of one another, for which purpose one roller carrier is clamped against stops of the stands perpendicular to the direction of the strand, whereas the other adjustable roller carrier is supported by means of hydraulic piston engines provided on a releasable traverse connecting the two stands.

This known support roller frame is very complex in construction, takes up a lot of space in the plane perpendicular to the direction of the strand and is particularly unsuitable for the frame immediately downstream of the mold - also called a zero frame.

The object of the invention is to provide a support roller stand for metal, in particular continuous steel casting plants, which is simple in construction, takes up little space, is particularly suitable for the so-called zero stand and is long

REPLACEMENT BLAπ (RULE 26) Has duration of use. This scaffold should also be usable for a dry or wet driving style.

This object is achieved with the features specified in the characterizing part of the main claim. Advantageous further developments are part of subclaims.

In contrast to the known prior art, the support roller frame is designed as a bending and torsion-resistant sheet-metal welded construction, with the two opposite ones between the projecting extensions

Frame elements fit one side part each and is connected with expansion screws. On the inner surface of the two frame parts, two carriers of T-shaped cross section are arranged at a distance from the roll width. The respective pivot bearing housing for the roller bearing is detachably fastened on these supports, which extend in the direction of the strand. To reduce manufacturing costs, the sheet metal

Welded constructions of the frame elements and the side parts composed of individual segments that are as similar as possible. This has the advantage that the individual elements are conceptually interchangeable. It also makes it possible to use the individual segment at a different location within the support roller frame. In addition, with regard to a construction that is as cost-effective as possible, care is taken that the individual connecting elements are as identical as possible.

As is known, in addition to the forces to be transmitted, the support roller stands are particularly stressed by the casting powder emerging from the mold and by the scale flaking off the strand shell in connection with the high temperatures. The burden of a corrosion attack is particularly high when the casting powder and the scale combine with spray water applied in the primary cooling area. For this reason, care has been taken in the proposed construction that the inner surfaces of the support roller frame are as smooth and flat as possible, so that no dirt nests can form and, on the other hand, a corrosion-resistant material, for example a stainless steel, is used for the entire construction. The flatness and smoothness of the inner surfaces is achieved by avoiding any kind of step or terrace heels and care is taken that there are no fasteners on the inner surface.

The proposed construction has the following advantages over the known prior art.

- Simple and modular sheet metal welded construction.

- Bending and torsionally rigid frame element, so that bracing elements are not required. - Dirt-repellent smooth and flat inner surfaces.

- With small external dimensions, plenty of free interior space for a variety of uses.

- Simple and variable attachment of the rollers to continuous supports.

- Long service life due to the use of corrosion-resistant materials.

- Suitable for dry and wet driving. - Particularly suitable as a zero scaffold.

In certain strand sections, so-called secondary cooling is required in addition to primary cooling by spray water or air-water mixtures. This is done by internal cooling of the rollers. Since the roller bearing often has a roller bearing, the pivot bearing housing must also be cooled.

In a further development, it is now proposed to integrate the cooling medium supply and removal in the frame part. The hitherto customary individual hose connections can thus be dispensed with. The T-shaped carrier has a passage so that the cooling medium can be accessed from the frame part to the roller. The coupling of the cooling medium guide from the fixed swivel bearing housing to the rotating roller or vice versa takes place via a known rotary insert (DE 42 07 042 B1). The advantage of this known rotary introduction is the closure of the bearing block by a cover having a cooling channel. The movement of the roller in relation to the cooling channel is compensated for by an elastic compensator. The advantage lies in the dirt-repellent closure of the storage room, since the roller bearings in particular are very sensitive to the ingress of dirt. So that the outer seals of the rotary inlet have a long service life, a lubrication device is integrated into the cover-like closure, which is connected to the outer seal. The aforementioned releasable connection of the pivot bearing housing to the carrier can be used to change the distance between the opposing rollers within a certain range of variation. This distance variation can also be used for curved support roller segments. Different distances to the frame part can thus be set in a simple manner, so that the sequence of the tangents in the point of contact of the strand of the rollers results in an arcuate contour with the previously defined arc radius of, for example, 10 m.

So that the cooling medium supply and discharge is functionally maintained even with variable distances in internally cooled rollers, a bushing is arranged according to the invention in the foot region of the pivot bearing housing, which extends into the passage of the T-shaped carrier. The bushing is guided in a sealed manner in this passage, so that the spacing can be varied by placing sheet metal parts of different thicknesses without any other structural change. The sheet metal pieces have a corresponding opening so that the aforementioned socket can be inserted.

In the drawing, the support roller frame according to the invention is explained in more detail using an exemplary embodiment.

Show it:

1 shows a section A-B in Figure 2 through an inventive segment of a support roller frame

FIG. 2 shows a section C-D in FIG. 1

FIG. 3 shows a view in the direction X in FIG. 2

Figure 4 as Figure 3 as a standard version

Figure 5a is an enlarged view of the pivot bearing of the rollers Figure 5b is a side view of the pivot bearing

Figure 5c shows a section E-F in Fig. 5b

Figure 6 is a schematic diagram for the cooling water circuit

FIG. 1 shows a section AB in FIG. 2 through a segment of a support roller stand according to the invention. In this embodiment, a curved segment is for a continuous caster shown. This segment essentially consists of an upper and a lower frame part 1, 2, which, as can be clearly seen here, are designed as a sheet metal welded construction. For this example, a total of nine roller pairs 3, 3 '- 11, 11' are combined in one segment. There are three pairs of roles, z. B. 3.3 '- 5.5' on a straight support section 12.12 'by means of

Screws attached. The adjustment of the distance of the rollers from the carrier section 12, 12 'with regard to the predetermined diameter of the sheet system is carried out using shims 13, 13', 14, 14 '. Details can be found in Figure 5a. In this exemplary embodiment, the upper and lower frame parts 1, 2 are each provided with an opening 48, 49. These breakthroughs, several of which are each

Frame part can be arranged, on the one hand, to ensure that the scale deposited in the segment can fall out and, on the other hand, to be able to open pipes for a desired spray cooling.

Figure 2 shows a section C-D in Figure 1. In this section, the interaction of the upper and lower frame parts 1, 2 with the side parts 15, 16 can be seen. The side parts 15, 16 are likewise designed as sheet-metal welded constructions and are detachably connected to the upper and lower frame parts 1, 2 by means of expansion screws 17, 17 ", 18, 18 '. In order that the side parts 15, 16 can be fitted, the

Frame parts 1, 2 each have a projecting extension 19, 19 ', 20, 20' on both sides. This results overall in a torsionally rigid box-like segment which has smooth and flat inner surfaces 21, 22. These smooth and flat inner surfaces 21, 22 are of essential importance for this construction since the formation of dirt nests is thereby avoided. Care was taken to ensure that there were none

Step or terrace heels comes and all connecting elements are outside the interior. The only projecting element is a guide plate 23, 24 arranged on the respective side element 15, 16 in order to be able to move the cold start strand in a guided manner. In order to be able to hang the segment in the supporting structure of the support roller frame, two outwardly extending pins 26, 26 ', 27, 27' (FIG. 3) are arranged on the side elements 15, 16. The details of the storage of the rollers 7, 7 'are explained in more detail in FIGS. 5a to c.

Figure 3 shows a view in the direction X in Fig. 2. In this illustration, the modular structure of the sheet metal construction of the segment can be seen. On the one hand care was taken that the structure is as symmetrical as possible and on the other hand that the connecting elements z. B. the expansion screws are as identical as possible. Both of these points reduce the procurement costs and reduce the stock of spare parts.

FIG. 4 shows in the same view as FIG. 3 a standard version of a side part 15 '. In contrast to Fig. 3, this side part 15 'is not adapted for a special arch segment, but is particularly suitable as a standard part for a segment of a vertical casting plant. The illustration clarifies the symmetry according to the invention of the frame parts and the figure even more than the embodiment according to FIG

Use of identical parts if possible.

5a to 5c show the details of the mounting of the rollers, for example the left side of the lower roller 7 "in FIG. 2. On the inner plate of the frame part 2 there is a T-shaped carrier which extends in the transport direction of the strand (see FIG. 1 ), here for example by welding. Only a special section 30 'of the T-shaped support is considered in this figure. The roller pairs 6.6 "-8.8' are arranged on this section 30 '. The pivot bearing housing 31 is detachably arranged on this carrier section 30 '. Between the top of the support portion 30 'and the bottom of the

A bearing plate 32 can be arranged in the rotary bearing housing 31. With the aid of this shim 32, on the one hand the distance of the respective pair of rollers 7, 7 'to one another and on the other hand the distance to the carrier section 30' can be adjusted with a view to adapting to the predetermined arc diameter. The roller bearing 33 is arranged in the rotary bearing housing 31. Since part of the heat of the roller 7 'is also transferred to the pivot bearing housing 31, the pivot bearing housing 31 must be cooled in order to protect the roller bearing 33. For this purpose, an opening 34 is provided in the inner plate of the frame part 2, which is connected to a channel 35 arranged in the carrier section 30 'and the pivot bearing housing 31. The cooling water is supplied to the individual channels 35 of the respective storage of the rollers via a recess 36 in the carrier section 30 ". This channel 36 extends continuously over the individual sections 12 ', 30', 37 'of the T-shaped carrier A supply of the cooling water is ensured irrespective of the thickness of the washer 32, a bush 38 is arranged in a cylindrical recess in the carrier section 30 'and the rotary bearing housing 31. The sealing takes place via seals 39, 39 'arranged on the outer jacket of the bush 38. In Figure 5b it can be seen that the channel 35 has a lateral kink. The cooling process is now designed so that the cooling water from the channel 35 around the pivot bearing 31 around an annular gap 40, in order to then be guided via a further channel 41 to a radially extending bore 42. From here it flows through the rotating union 43 into the roller 7 'in order to cool it from the inside. The heated cooling water then emerges again at the other end of the roller 7 ′ and is discharged via the frame element 2 in the same way as previously explained. A schematic diagram of the entire cooling water circuit can be seen in FIG. 6. The details of the representation of the rotary union 43 are not discussed in detail here, since this principle is known. However, reference should also be made to the lubrication according to the invention, which is arranged in the form of a grease cup 44 in the cover 45 flanged to the pivot bearing housing 31. The outflow side of the grease cup 44 is connected to the outer seal 47 of the bearing block 31 via a channel 46 (FIG. 5b). In a known manner it can be achieved, for example, by means of an expanding gas cushion, that a small amount of grease constantly reaches the outer seal 47, so that the roller bearing 33 is always protected from this side.

Figure 6 shows a schematic diagram of the cooling water circuit for a roll, for example

7 '. The storage on the right and left is only shown schematically here. The cooling water enters the frame element 2 from a connection (not shown here). The cooling water reaches the bearing 51 via the path explained in FIGS. 5a to c and then flows through the roller 7 'from the inside, so that it is cooled accordingly . At the other end, the cooling water emerges again via the bearing 52 arranged on the left. The cooling water then flows in a meandering manner through the frame part 2 and emerges from the frame part again at the opposite end 53.

Claims

Claims:

1. Support roller frame for metal, in particular continuous steel casting plants, which is divided into straight or curved segments with roller carriers, with several rollers being combined on one roller carrier and two each

Roller carriers for parallel running strand sides are fastened to holding elements running on both sides next to the casting strand cross-section and the rollers are mounted on both sides in pivot bearing housings, which in turn are connected to the roller carrier, characterized in that the roller carriers as a rigid frame element (1, 2) in the form of a Sheet metal welded construction are formed and both frame elements (1, 2) have a projecting extension (19, 19 ', 20, 20') at each end, between which a side element (15, 16) designed in the form of a sheet metal welded construction is fitted and is releasably connected to the two frame elements (1, 2) by means of expansion screws and the support roller segment thus formed, which is resistant to bending and torsion, has smooth and flat inner surfaces (21, 22) ^' and both frame elements (1, 2), each with two at a distance of the roller width arranged T-shaped in the strand running direction extending beams (12,12 ', 30,30') are provided on d each releasably

Pivot bearing housing (31) is fastened, the sheet metal welded construction of the frame elements (1, 2) and the side parts (15, 16) being composed of individual segments that are as similar as possible and the connecting elements are as far as possible identical and for all parts of the support roller segment including the Fasteners a corrosion-resistant material is used.

2. Support roller frame according to claim 1, characterized in that for hanging the support roller segment in the support frame to the

At least one pin (26, 26 ', 27, 27') extending outwards is attached to the side parts (15, 16). Support roll frame according to claim 1 or 2, characterized in that the expansion screw connecting the respective side part (15, 16) to the two frame parts (1, 2) is divided into two expansion screws (17, 17 ', 18, 18') of equal length

Support roll frame according to one of claims 1 to 3, characterized in that, if necessary, the inside of the respective side part (15, 16) is provided with a guide plate (23, 24) extending in line for guiding the cold start line

Support roll frame according to one of claims 1 to 4, characterized in that in the case of internally cooled rolls (3-1 1, 3'-11 ') the cooling medium supply and removal is integrated in the frame element (1, 2) and the likewise cooled pivot bearing housing ( 31) is connected to the cooling medium supply and removal via a passage (35) arranged in the T-shaped support (30, 30 ^* ) and the coupling of the cooling medium guide from the fixed pivot bearing housing (31) to the rotating roller (3-11, 3 "-11 ') or vice versa via a known rotary introduction

Support roll frame according to claim 5, characterized in that a lubrication device (44) is integrated into the pivot bearing housing (31) and is connected to the outer seal (47)

Support roll frame according to one of claims 1 to 6, characterized in that the distance between the opposing rolls (3,3 '- 11, 11') or the distance of the roll (3-11, 3'-1 V) from the frame part (1 , 2) can be adjusted via a spacer plate (13, 13 ', 14, 14') which can be arranged between the T-shaped support (12, 12 ', 30, 30') and the foot area of the rotary bearing housing (31) 8. Support roll frame according to claim 7, characterized in that a bush (38) is fixed in the foot region of the pivot bearing housing (31) for maintaining the cooling media supply or removal, the bushing up to the T-shaped carrier (12.12 ', 30, 30 ') extending extent in the passage (35) of the T-shaped support (12, 12', 30, 30) sealed (39, 39 ') and guided.