EP3509768B1 - Device and method for applying a liquid medium to a roll and/or to a rolled material and/or for removing the liquid medium - Google Patents

Description

The invention relates to a device for applying a liquid medium to a roller, in particular to a work roll of a roll stand, and / or to a rolling stock, a slab or a strip and / or for removing the liquid medium, the device comprising at least one spray nozzle, at least has a row of spray nozzles or at least one cooling bar for spraying the medium and at least one plate element which is designed for collecting the medium, the roller being designed for rolling rolling stock, the rolling stock, the slab or the preliminary strip being conveyed in a conveying direction, wherein the plate element has on one of its surfaces at least one guide element which is designed to deflect medium in a transverse direction which is horizontal and transverse to the conveying direction. The invention further relates to a method for applying a liquid medium and / or for removing the liquid medium.

The requirements for the efficiency of work roll cooling are constantly increasing. In order to increase efficiency, ever larger work roll cooling media quantities or cooling water quantities are installed. With the upper work roll, however, there are limits due to the water standing on the scraper plate. As a rule, the water at the top cannot drain as quickly as it is applied. This means that a water pool is formed on the upper stripper plate, especially for wide rolling mills for large plate or strip widths to be rolled. If the cooling water splashes into this pent-up water pool, the cooling effect is impeded.

Water, emulsion, dispersion, oil, kerosene or other media can be used as the cooling medium. Simplified, the term mostly refers to water in this regard.

A device of the type mentioned is from the JP H06 339712 A known. Here there is a channel running horizontally and transversely to the conveying direction on a plate element so that pent-up cooling water can be drained off to the side.

In order to favor the drainage of the water, is in the JP 61176411 A a kind of drainage is arranged so that the water can drain into the area behind the spray pipes. Furthermore, in the JP 06339712 A For the upper roller cooling, a 90 ° transverse drain channel is provided above the scraper, into which water can flow and drain laterally. This is intended to improve the upper roller cooling in the middle or to make it uniform across the width. A more complex technology discloses the EP 0 899 030 B1 . Here an active suction of the water from the area above the upper scraper plate is shown.

All previously known solutions are not particularly efficient, disrupt the unimpeded water drainage or are very complex.

The invention is therefore based on the object of achieving an improvement in the cooling effect, in particular of the upper work roll cooling, and preferably in the case of wide hot strip mills with a high specific amount of water. Furthermore, an improved removal of the descaling water should be made possible when descaling a slab or a strip. Thus, improved drainage conditions for the cooling medium of the upper work roll cooling are to be made possible, which should be achieved by avoiding the so-called pool effect, i.e. the accumulation of the cooling medium above the wiper plate and / or different cooling medium levels above the wiper plate width (higher in the middle). The same applies to the descaling of a slab or a strip.

The solution to this problem by the invention is characterized in that the at least one guide element is flat and is arranged at an angle to the transverse direction on the plate element, the angle being between 5 ° and 80 °, or in that the at least one guide element is curved is.

The at least one spray nozzle preferably delivers the medium onto the roller with a predetermined center direction, the tangent pointing in the circumferential direction of the roller at the point of impact of the center direction on the roller having an angle to the center direction that is greater than 90 °.

According to a further embodiment of the invention, a plurality of spray nozzles and / or cooling beams arranged vertically one above the other are arranged, the plate element being arranged between two or below these spray nozzles and / or cooling beams

It can also be provided that a plurality of guide elements are arranged on the plate element, their angle in particular decreasing with increasing distance from the roller, from the cooling beam or from a descaling beam.

It can also be provided that the at least one guide element is arranged vertically or inclined or twisted about its longitudinal axis in the direction of the plate element.

It can also be provided that a plurality of guide elements are arranged on the plate element, these being arranged symmetrically or asymmetrically with respect to a vertical center plane on the plate element.

It can also be provided that a plurality of guide elements are arranged on the plate element, these differing in their vertical height.

Furthermore, means for cross-spraying can be arranged on the plate element.

The plate element is preferably arranged at an angle to the horizontal which is between 1 ° and 45 °, preferably between 1 ° and 20 °.

The invention relates to a method for applying a liquid medium to a roll, in particular to a work roll of a roll stand, and / or to a rolling stock, for example a slab or a strip, and / or for removing the liquid medium. For this purpose, a device according to the invention is designed with at least one spray nozzle, at least one row of spray nozzles or at least one cooling bar for spraying on the medium and with at least one plate element which is designed for collecting the medium. The invention provides that the plate element is provided on one of its surfaces with at least one guide element which is designed to deflect medium in a transverse direction which is horizontal and transverse to the conveying direction, the flow movement (ie the flow speed) of the applied liquid medium is used to deflect the liquid medium by means of the at least one guide element in the transverse direction, in that the at least one guide element is flat and is arranged at an angle to the transverse direction on the plate element, the angle being between 5 ° and 80 °, or by that at least one guide element is curved.

All of the design features of the device proposed above can be used advantageously in the aforementioned method.

The invention is preferably used in a heavy plate stand, in a Steckel stand, in a hot strip mill or in a CSP / USP plant.

Fig. 1

schematisch die Seitenansicht einer Vorrichtung zum Aufbringen von Wasser auf die Arbeitswalze eines Walzgerüsts und das Entfernen des Wassers gemäß einer ersten Ausführungsform der Erfindung,

Fig. 2

schematisch die zu Figur 1 zugehörige Draufsicht auf die Vorrichtung,

Fig. 3

schematisch die Draufsicht nach Figur 2 gemäß einer zweiten Ausführungsform der Erfindung,

Fig. 4

schematisch die Draufsicht nach Figur 2 gemäß einer dritten Ausführungsform der Erfindung,

Fig. 5

schematisch die Draufsicht nach Figur 2 gemäß einer vierten Ausführungsform der Erfindung,

Fig. 6

schematisch die Seitenansicht einer Vorrichtung zum Aufbringen von Wasser auf die Arbeitswalze eines Walzgerüsts und zum Entfernen des Wassers gemäß einer fünften Ausführungsform der Erfindung,

Fig. 7

schematisch die zu Figur 6 zugehörige Draufsicht auf die Vorrichtung,

Fig. 8

schematisch die Seitenansicht einer Vorrichtung zum Aufbringen von Wasser auf eine Bramme zwecks Entzunderung derselben sowie zum Entfernen des Wassers und

Fig. 9

schematisch die zur Figur 8 zugehörige Draufsicht auf die Vorrichtung.

Exemplary embodiments of the invention are shown in the drawing. Show it:

Fig. 1

schematically the side view of a device for applying water to the work roll of a roll stand and removing the water according to a first embodiment of the invention,

Fig. 2

schematically the to Figure 1 associated top view of the device,

Fig. 3

schematically the top view after Figure 2 according to a second embodiment of the invention,

Fig. 4

schematically the top view after Figure 2 according to a third embodiment of the invention,

Fig. 5

schematically the top view after Figure 2 according to a fourth embodiment of the invention,

Fig. 6

schematically the side view of a device for applying water to the work roll of a roll stand and for removing the water according to a fifth embodiment of the invention,

Fig. 7

schematically the to Figure 6 associated top view of the device,

Fig. 8

schematically the side view of a device for applying water to a slab for descaling the same and for removing the water and

Fig. 9

schematically the for Figure 8 associated plan view of the device.

In Figure 1 and Figure 2 the side view or top view of a device 1 for applying water W to the work roll 2 of a roll stand and for removing the water W is outlined. The work roll 2 is supported by a backup roll 10. The work roll 2 rolls a rolling stock 3, which in a Direction of conveyance F is moved. The conveying direction F corresponds to the direction of the horizontal H.

The device 1 comprises a plurality of spray nozzles 4 which are arranged in a water cooling beam 11. Water W is sprayed onto the surface of the work roll 2 with the spray nozzles 4. A plate element 5 (stripper plate) is provided to drain the sprayed water and to prevent water flowing freely onto the belt, which is inclined at an angle γ to the horizontal H. Guide elements 7 and 8 are arranged (in particular welded on) on the upper surface 6 of the plate element 5, which enable the water W to be drained to the side in a transverse direction Q, which is horizontal and perpendicular to the conveying direction F.

How out Figure 2 results, the guide elements 7 and 8 are offset in the conveying direction F in the exemplary embodiment described, but are arranged symmetrically to a vertical center plane ME. The guide elements 7, 8 are straight and are arranged at an angle β to the transverse direction Q.

How from Figure 1 can be seen, the water jet is sprayed through the spray nozzles 4 in a central direction M onto the surface of the work roll 2. The tangent T, which points in the circumferential direction of the work roll 2 and results on the surface of the work roll 2 at the point at which the central direction M strikes the work roll 2, is at an angle a to the central direction M, which is preferably greater than 90 ° is.

Means 9 for transverse spraying are also arranged on the plate element 5.

Out Figure 1 can also be seen that the guide elements 7, 8 can have a different height h.

The guide element 7, 8 can consist of at least one long sheet metal which is fastened to the plate element 5 on its narrow side.

In order to enable a rapid drainage of the water W or another cooling medium in the upper work roll cooling, it is therefore provided to use the speed of the cooling water W flowing on the work roll 2 itself and to deflect the water surge backwards and to the side. The illustration after Figure 1 and Figure 2 make the functionality and the arrangement of the optimized water drainage clear in the side view and in the top view.

Figure 1 shows an upper work roll cooling on the outlet side. Water W emerges from the roller cooling beam 11 and ultimately from the nozzles 4 primarily from several spray rows and sprays onto the roller 2. At least one spray row is arranged such that the water flow is inclined in the direction of the plate element 5 (scraper plate). That is, the angle of attack α between the center of the water jet M and the tangent T to the roller surface is greater than 90 °, as in Figure 1 for the lower two spray rows.

Through this advantageous alignment, a targeted water flow is initially achieved along the roller 2 and with small deflection losses to the rear. The water flowing backwards (in the rolling direction) must now be diverted to the side as continuously as possible. This is done - as described - with deflection plates (guide elements 7, 8) on the plate element 5 (wiper plate), which are arranged at an angle of attack β of greater than 5 °, see FIG. Figure 2 , where the water flow deflection principle is shown. The plate element 5 is in the conveying direction F - as it is Figure 1 shows - completed by a rear wall 12.

With conventional roller cooling, the water only flows backwards against a rear wall, accumulates there, due to the dammed water level lateral water drainage takes place. With some solutions (e.g. the one mentioned at the beginning JP 06339712 A ) the water surge is slowed down by a drainage.

In the solution proposed according to the invention, the water W runs along the employed guide elements 7, 8 (deflection plates) and is largely deflected to the side, that is to say in the transverse direction Q.

If possible, there are no disruptive edges (except inevitable fastenings, bearings, screw connections, etc.) above the plate element, which disrupt, hinder or brake the water flow away from the roller or from the point of application to the rear or to the side.

In the embodiment according to Figure 1 and 2nd are four baffles 7, 8 each staggered one behind the other, which deflect the water W substantially symmetrically to the sides. At least one guide element (deflection plate) is generally required for the desired deflection effect. At the lateral ends of the plate element 5 (scraper plate), the water can then drain downwards (e.g. into a sintering channel).

The distance d between the plate element 5 (stripper plate) and the laterally delimiting surroundings, such as roller stand 14, chocks, bending blocks or inlet or outlet guide frames, should be as large as possible (preferably greater than 50 mm). Disabilities caused by limiting lateral surfaces can be avoided by providing drain holes, preferably in the area of the water currents. Advantageously, a drip edge or tear-off edge (similar to a window sill) or a groove in the underside at the edge of the plate element 5 is provided on the side surfaces below the scraper (ie the plate element 5), so that water does not inward onto the edge of a wide one Tape or running on the disc. To remove the residual water in the rear area of the scraper is optional In addition, a transverse spray 13 is provided, which pushes the roller cooling water outwards, as in Figure 2 is indicated. The means 9 are provided for this.

The plate element 5 or regions thereof can also be designed on the upper side with an inclination to the side in order to additionally improve a drainage of the water.

The guide elements 7, 8 (deflection plates) can be of different heights (see height h, which is preferably greater than 20 mm). The guide elements 7, 8 (baffles) can - like it Figure 2 shows - be staggered one behind the other or arranged side by side. The latter solution shows Figure 3 . In contrast to the solution according to Figure 2 it is also provided here that all guide elements 7 are in one position, viewed in the transverse direction Q.

An advantageous curved or curved design of the guide elements 7 (water deflection plates) is also possible, as shown in the illustration Figure 4 can be seen. Here, the shape of the guide elements 7 is similar to the shape of a turbine blade or a plow, the angle β to the transverse direction Q changes continuously over the extent of the guide element.

A change in the inclination of the guide element 7 over the extent of the same - in the manner of a turbine blade - is also possible and contemplated in order to optimize the flow conditions. The guide elements 7, 8 (deflection plates) can thus be aligned vertically in the direction of the plate element 5 (scraper plate) or can be designed to be somewhat inclined or twisted about the longitudinal axis.

While typically a symmetrical deflection of the water jet in the transverse direction Q on both sides of the plate element 5 is advantageous, it can also another configuration can be provided. In certain cases it can be advantageous if the guide elements 7, 8 are oriented only in one direction. Such an embodiment shows Figure 5 . It can thus be achieved that the water W (or of course another cooling medium) is concentrated on one outlet side.

In a further embodiment of the invention, not only guide elements 7, 8 (deflection plates) are provided on the plate element 5, which, for. B. acts as a scraper or as a water-band separating plate, as was the case in the previously described embodiments. Guide elements 7, 8 without plate elements or on plate elements 5 can also be provided, which are mounted between or / and above or / and below the cooling beam 11, in order to redirect the water flow flowing back to the side at an early stage. The embodiment according to FIGS Figures 6 and 7 . According to Figure 6 there are four water cooling beams 11 arranged one above the other, each carrying rows of spray nozzles 4, 4 ', 4 ", 4"'.

To separate the various water flows, horizontally (with or without backward inclination) arranged plate elements 5 above the scraper or the water-band separating plate (ie the in Figure 6 lowest plate element 5, which ends near the work roll 2), on which the guide elements 7, 8 (deflection plates) are fastened. An example of this is in Figure 6 sketched below the bottom roller cooling beam 11.

In order to favor the flow conditions to the sides, the nozzle feed pipes or the nozzles 4, 4 ', 4 ", 4"''can still be oriented somewhat obliquely to the central plane ME. The water then sprays out at a small angle to the side, as in Figure 7 can be seen in the top view.

The guide elements 7, 8 can be designed as deflection plates, but they can also be designed differently (e.g. plates made of the most varied of materials) Materials can exist), provided that they fulfill the desired task, namely the deflection of the water jet, that is, the cooling medium deflection principle.

In the proposed concept, the typical amount of water used is preferably a specific amount of water of more than 40 m ³ per hour and per meter of width for the upper roller cooling.

The angle of attack γ for the upper plate element 5 (stripper plate) of the work roll cooling should be less than 45 ° to the horizontal so that the water does not have to run excessively uphill.

Not only can the drainage conditions of the work roll cooling water be improved with the proposed concept, but there is also an improved removal of descaling water (incl. Scale particles) to the side, i.e. in the transverse direction Q, towards a scale washer or another belt or plate cooling device for the top possible, as is the embodiment of the Figures 8 and 9 shows where a scale washer is shown, in which the device 1 is used.

Out Figure 8 it can be seen that the plate element 5, here designed as a water drainage plate, grinds on the moving slab, plate or the supporting strip 3. With its own weight, it rests on the rolling stock so that it can move. The plate element 5 (water drainage plate) can also be held at a defined distance from the slab 3 (without rolling stock contact).

In the case of the scale washer, the descaling water W for the descaling is first sprayed onto the slab 3 by means of the descaling bar 15, the water W runs up against the direction of movement (conveying direction F) of the slab 3 on the plate element 5. The guide elements 7, as seen in the side view in FIG Figure 8 and the top view in Figure 9 are recognizable. Various arrangements and configurations of the guide elements are also possible here. Most of the water runs off to the side. The residual water is fed to a water collecting channel 16. A slope 17 in the water collecting channel 16 favors this.

The proposed device is advantageously used in particular in the case of wide rolling plants such as heavy plate stands, Steckel stands or other wide hot strip mills.

It should be expressly mentioned that the design features described above can also be used in any combination. This applies in particular to the design and arrangement of the guide elements 7, 8.

Reference symbol list:

1

Device for applying and removing water

2nd

Roller (work roller)

3rd

Rolled stock / slab, plate, support

4th

Spray nozzle

4 '

Spray nozzle

4 "

Spray nozzle

4 '' '

Spray nozzle

5

Plate element

6

Surface of the plate element

7

Guide element

8th

Guide element

9

Cross-spraying agents

10th

Backup roller

11

Chilled beams (water chilled beams)

12th

Back wall

13

Cross spray

14

Roll stand

15

Descaling bar

16

Water gutter

17th

Slope in the gutter

W

liquid medium (water)

F

Direction of conveyance

Q

Cross direction

H

horizontal

V

vertical

M

Center direction

ME

vertical center plane

T

tangent

H

height

d

distance

α

Angle between the center direction and tangent

β

Angle to the cross direction

γ

Angle of the plate element to the horizontal

Claims (11)

1. Device (1) for application of a liquid medium (W) to a roll (2), particularly to a work roll of a roll stand and/or to rolling material, a slab or a pre-strip (3) and/or for removal of the liquid medium (W), wherein the device (1) comprises at least one spray nozzle (4), at least one spray nozzle row or at least one cooling bar (11) for spraying the medium (W) and at least one plate element (5), which is constructed for collection of the medium (W), wherein the roll is constructed for the rolling of rolling material (3), wherein the rolling material, the slab or the pre-strip (3) is conveyed in a conveying direction (F) and wherein the plate element (5) has on its surfaces (6) at least one guide element (7, 8) constructed for deflection of medium (W) in a transverse direction (Q), which lies horizontally (H) and transversely to the conveying direction (F)
   characterised in that
   the at least one guide element (7, 8) is formed to be flat and is arranged at angle (β) to the transverse direction on the plate element (5), wherein the angle (β) is between 5° and 80°, or the at least one guide element (7, 8) is formed to be curved.
2. Device according to claim 1, characterised in that the at least one spray nozzle (4) issues the medium (W) with a predetermined centre direction (M) onto the roll, wherein the tangent (T) facing in circumferential direction of the roll (2) has at the place of incidence of the centre direction (M) on the roll (2) an angle (α), which is greater than 90°, to the centre direction (M).
3. Device according to claims 1 or 2, characterised in that several spray nozzles (4, 4', 4", 4''') and/or cooling bars (11) are arranged vertically one above the other, wherein the plate element (5) is arranged between two or below these spray nozzles (4, 4', 4", 4''') and/or cooling bars (11).
4. Device according to any one of claims 1 to 3, characterised in that several guide elements (7, 8) are arranged on the plate element (5), wherein, in particular, the angle (β) thereof decreases with increasing spacing from the roll (2), from the cooling bar (11) or from a descaling bar (15).
5. Device according to any one of claims 1 to 4, characterised in that the at least one guide element (7) is arranged perpendicularly or at an inclination or to be twisted about its longitudinal axis in the direction of the plate element (5).
6. Device according to any one of claims 1 to 5, characterised in that several guide elements (7, 8) are arranged on the plate element (5), wherein these are arranged symmetrically with respect to a vertically extending centre plane (ME) or asymmetrically on the plate element (5).
7. Device according any one of claims 1 to 6, characterised in that several guide elements (7, 8) are arranged on the plate element (5), wherein these are different in the vertical height (h) thereof.
8. Device according to any one of claims 1 to 7, characterised in that means (9) for transverse washing down are arranged on the plate element (5).
9. Device according to any one of claims 1 to 8, characterised in that spacing (d) between the plate element (5) and the laterally bounding environment, particularly with respect to a roll housing (14), a chock, a bending block or an inlet or outlet frame, is greater than 50 millimetres.
10. Device according to any one of claims 1 to 9, characterised in that the plate element (5) is arranged at an angle (γ), which is between 1° and 45°, with respect to the horizontal (H).
11. Method for applying a liquid medium (W) to a roll (2), particularly to a work roll of a roll stand and/or to a rolling material, a slab or a pre-strip (3) and/or for removing a liquid medium (W), wherein a device (1) with at least one spray nozzle (4), at least one spray nozzle row or at least one cooling bar (11) for spraying the medium (W) and at least one plate element (5), which is constructed for collecting the medium (W), is used, characterised in that
    the plate element (5) is provided on its surfaces (6) with at least one guide element (7, 8) constructed for deflecting medium (W) in a transverse direction (Q) which lies horizontally (H) and transversely to the conveying direction (F), wherein the flow movement of the applied liquid medium (W) is used in order to deflect the liquid medium (W) in transverse direction (Q) by means of the at least one guide element (7, 8) in that the at least one guide element (7, 8) is formed to be planar and arranged at an angle (β) to the transverse direction on the plate element (5), wherein the angle (β) is between 5° and 80°, or in that the at least one guide element (7, 8) is formed to be curved.

Images