EP1943033B1 - Method and device for cleaning slabs, thin slabs, profiled elements, or similar - Google Patents

Abstract

Disclosed is a method for removing loose scale and other foreign matter from the top and/or bottom face of a cast product (3), such as a slab, thin slab, profiled element, or similar, with the aid of flowable media which are sprayed onto the cast product (3) by means of a cleaning device (5) comprising at least one spraying apparatus (8, 9) that is disposed above the cast product (3) and at least one spraying apparatus (8, 9) that is arranged below the cast product (3). According to said method, the amount of media and/or the effective width and/or the pressure of the media is/are controlled separately and independently of time for each spraying apparatus (8, 9). The invention also relates to a device for removing loose scale and other foreign matter from the top and/or bottom face of a cast product (3) with the aid of flowable media which are sprayed onto the cast product (3) by means of a cleaning device (5) comprising at least one spraying apparatus (8, 9) located above the cast product (3) and at least one spraying apparatus (8, 9) located below the cast product (3). The spraying apparatuses (8, 9) and/or the nozzles (13) that are placed on the spraying apparatuses (8, 9) are configured so as to respond via a controller/a guiding system.

Description

The invention relates to a method for removing loose scale and other foreign matter from the top and / or bottom of a cast product such as slab, thin slab, profile or the like with the aid of flowable media by means of a cleaning device consisting of at least one and at least one arranged below the cast product injection device are sprayed onto the cast product. The invention also relates to a corresponding cleaning device.

From the WO 02/070157 A1 A method for descaling belts in a rolling train with a scale scrubber and a finishing line arranged behind the scale scrubber in the running direction of the belt is known in which the belt is subjected to descaling pressure in the scrubber on the top and bottom and cooled within the finishing train , In this case, a symmetrical temperature distribution is generated at the top and bottom of the belt in the scale scrubber and maintained in the same way within the finishing train. The invention relates to a descaling in combination with a rolling train.

From the EP 1 083 010 A2 For example, an adjustment method for two shielding elements is known in which a metal strip having a metal strip width, a strip center and edge regions is transported on a roller table with a roller conveyor center in a transport direction. The metal strip has a temperature profile over the metal strip width. By means of shielding a cooling medium is shielded from the edge regions of the metal strip. In this case, the shielding elements are adjusted in such a way that, viewed in the transport direction, the temperature profile approximates a setpoint temperature profile behind the shielding elements becomes. For this purpose, the shielding elements are adjusted asymmetrically with respect to the roller table center. This invention describes a method for influencing the spray width, which necessarily requires shielding elements.

• zwei ortsfeste Führungsrahmen, die im wesentlichen waagerecht oberhalb des Rollgangs so angeordnet sind, dass sie die vertikale Mittelebene des Rollgangs rechtwinklig schneiden,
• zwei Stützrahmen, die im wesentlichen waagerecht oberhalb beider Seiten des Rollganges parallel zu dessen Mittelebene angeordnet sind und deren beide Ende verschiebbar in den Führungsrahmen gelagert sind, wobei das eine im Bereich des einen Seitenrandes der auf dem Rollgang liegenden Stahlblechtafel angeordnetes Abschirmglied an einem der beiden Stützrahmen und das andere, im Bereich des anderen Seitenrandes der Stahlblechtafel angeordnete Abschirmglied am anderen Stützrahmen befestigt ist, und
• einen Antrieb zum Bewegen der beiden Stützrahmen zusammen mit den beiden Abschirmgliedem aufeinander zu und voneinander weg in Breitenrichtung der auf dem Rollgang liegenden Stahlblechtafel um gleiche Strecken. Diese Erfindung beschreibt eine Vorrichtung zum Kühlen einer Stahlblechtafel nach dem Warmwalzen, bei der Abschirmelemente eingesetzt werden.

An apparatus for cooling a steel sheet panel immediately after hot rolling is disclosed in US 5,256,066 DE 32 30 866 C2 described. The apparatus is formed with a horizontal roller table for the steel panel, with a plurality of above and below the steel sheet arranged at predetermined intervals in the longitudinal direction of the steel panels, extending in the direction of width of the steel sheet spray jets, each having a length substantially equal to the Width of the steel sheet panel is and with a plurality of nozzles for spraying cooling water on the steel sheet in the region of the two side edges of the steel sheet arranged Abschirmgliedem for interrupting the cooling water jets whose bottoms are inclined from the center of the steel sheet panels down. The shield members are moved towards and away from each other in the width direction of the steel sheet panel on the roller table by means of a shifting device. The displacement device has in this case:

• two fixed guide frames, which are arranged substantially horizontally above the roller table so that they intersect the vertical center plane of the roller table at right angles,
• two support frames, which are arranged substantially horizontally above both sides of the roller table parallel to the center plane and the two end are slidably mounted in the guide frame, wherein the one arranged in the region of one side edge of lying on the roller table sheet steel shielding member on one of the two support frame and the other, arranged in the region of the other side edge of the steel sheet board shielding member is attached to the other support frame, and
• a drive for moving the two support frames together with the two Abschirmgliedem towards and away from each other in the width direction of lying on the roller table sheet steel panel by equal distances. These The invention relates to a device for cooling a steel sheet after hot rolling, in which shielding elements are used.

A method for cooling hot steel sheet from an upstream hot rolling mill is characterized by EP 0 153 688 B1 known. The steel sheet is longitudinally guided by pairs of upper and lower rolls arranged in the transport direction of the steel sheet, with cooling water being supplied from nozzles to a plurality of cooling units arranged in the same longitudinal direction on the upper and lower sides of the steel sheet. Each cooling unit is arranged between adjacent upper and lower roller pairs. The method consists of determining the temperature distribution in the steel sheet before starting the cooling, setting the desired average cooling rate, determining the distance from the sheet edge over which the supply of cooling water to at least the underside of the steel sheet due to the temperature distribution is to interrupt, so that the temperature of the inner edge portion of the steel sheet is kept above the temperature of the middle portion to ensure that the Ar3 transformation in the inner edge portion occurs simultaneously with or after the Ar3 transformation in the middle portion and interrupting the direct supply of the cooling water to the edge portion of the steel sheet over the Distance determined by the previous method step by shielding an appropriate number of nozzles. This invention relates to hot steel sheets after hot rolling to produce specific sheet properties by defined cooling.

A cleaning device is for example from the DE 101 43 868 A1 or the WO 03/022 475 A1 and relates to a device for removing loose scale from the surface of a slab, in particular a mini - mill thin slab. Such a mini mill comprises at least one slab caster, one slab separator, one temperature compensation furnace and one or more coiler roll stands. Such a device is improved in that a sprayer at least each comprises a relative to the slab lower spray tube and at least one upper spray tube, each spray tube is equipped with a number of spray nozzles. The Abspritzvorrichtung is arranged in front of the temperature compensation furnace, in particular a roller hearth furnace. The Abspritzvorrichtung is connected to a supply for water with technologically required pressure and with a measured according to the number of spray nozzles volume flow. In claim 6 it is stated that the supply pressure of the water to the spray pipes of the sprayer is between 5 and 15 bar, preferably less than 10 bar.

• Das in der Mitte der Dünnbramme aufgebrachte Medium fließt nach außen, damit ist die Medienmenge und Kühlwirkung an den Kanten größer.

Das Reinigungsmedium erreicht die Dünnbramme nicht nur von oben, sondern je nach konstruktiver Ausführung auch von der Außenseite.
Es besteht die Gefahr, die Brammenkanten zu stark abzukühlen.
Die Abkühlung der Dünnbramme ist von der Gießgeschwindigkeit abhängig. Bei kleinerer Gießgeschwindigkeit ist die Abkühlung bei gleicher Medienbeaufschlagung stärker als bei höherer Gießgeschwindigkeit. Typischerweise wird die Gießgeschwindigkeit einer Gießanlage einer Gießanlage entsprechend den Produktionsbedingungen auch innerhalb einer Gießsequenz variiert.
Bei Ende einer Gießsequenz wird üblicherweise das letzte Dünnbrammenstück abgetrennt und liegt auf dem Rollgang. Bei Einsatz der Reinigungsvorrichtung kühlt dieses Stück so stark ab, dass evtl. nachfolgend notwendige Trennvorgänge zur Zerkleinerung des letzten Dünnbrammenstückes ein wesentlich kälteres und damit festeres Material trennen müssen.
Tritt in der Gießanlage einer Störung auf, bei der die Dünnbramme nicht mehr aus der Anlage gefahren werden kann, muss zur Entfernung die Dünnbramme in Stücke unterteilt werden. Im Bereich der Reinigungsvorrichtung verschlechtert die Reinigungsvorrichtung dem Personal die Erreichbarkeit der Dünnbramme. Dabei muss der Zugang in kurzer Zeit möglich sein, um Beschädigungen durch Überhitzung der Anlagenteile durch die liegende Dünnbramme zu vermeiden.
Beim Starten des Gießprozesses kann der Kopf der Dünnbramme gegen die Reinigungsvorrichtung stoßen, insbesondere wenn der Abstand zwischen Dünnbrammenoberfläche und Reinigungsvorrichtung sehr dicht ist.
Ein unerwünschter Nebeneffekt der Reinigungsvorrichtung ist die Abkühlung der Dünnbramme. Die Abkühlung ist umso stärker, je länger das Medium Kontakt mit der Dünnbramme hat.
Mit zunehmendem Mediendruck steigt die Gefahr des Medienaustritts aus der Reinigungsvorrichtung. Bei ungeeigneter Medienführung wird zudem Reinigungsmedium nach dem Reinigungsvorgang ungewollt wieder auf die Dünnbrammenoberfläche geleitet. Möglicherweise werden dabei Fremdstoffe wie Zunder wieder auf die Dünnbrammenoberfläche geleitet.The existing solutions describe devices without adjustment options. If one presupposes a cleaning device which has been set permanently in terms of media quantity, cleaning width and position, the lack of flexibility leads among other things to undesired cooling of the thin slab and to an increased production risk. Furthermore, the top and bottom are cooled differently. With the same amount of media and the same media pressure, the thin slab top side is cooled more strongly than the underside due to the longer storage time of the medium. Then the thin slab head tends to lift. Thus, the passage of the thin slab in the following facilities is difficult.
An abutment of the thin slab head in subsequent devices can lead to a transport problem. Then a casting demolition of the casting is necessary.
The outer edges of the thin slab are cooled more than the middle area. This effect is also dependent on the current slab width. Causes are:

• The medium applied in the middle of the thin slab flows outwards, so that the amount of media and cooling effect at the edges is greater.

The cleaning medium reaches the thin slab not only from above, but depending on the structural design also from the outside.
There is a risk of cooling the slab edges too much.
The cooling of the thin slab depends on the casting speed. At a lower casting speed, the cooling is greater with the same media loading than with higher casting speed. Typically, the casting speed of a casting plant of a casting plant is varied within a casting sequence in accordance with the production conditions.
At the end of a casting sequence usually the last thin slab piece is separated and is on the roller table. When using the cleaning device, this piece cools down so much that possibly necessary subsequent separation operations for crushing the last thin slab a much colder and thus more solid material must be separated.
If a fault occurs in the casting plant, where the thin slab can no longer be removed from the plant, the thin slab must be divided into pieces for removal. In the area of the cleaning device, the cleaning device worsens the accessibility of the thin slab to the staff. In this case, access must be possible in a short time in order to avoid damage due to overheating of the system components by the horizontal thin slab.
When starting the casting process, the head of the thin slab may hit against the cleaning device, especially if the distance between the thin slab surface and cleaning device is very dense.
An undesirable side effect of the cleaning device is the cooling of the thin slab. The cooling is the stronger, the longer the medium has contact with the thin slab.
With increasing media pressure increases the risk of media leakage from the cleaning device. In the case of unsuitable media guidance, cleaning medium is also unintentionally redirected to the thin-slab surface after the cleaning process. It may be that foreign substances such as scale are returned to the surface of the thin slab.

The invention has for its object to improve the known cleaning devices such that the cast product such as slab, thin slab, profile or the like by flexible adjustment, especially the cooling medium, is improved in its properties and to avoid the above-mentioned disadvantages.

This object is achieved in that in a method according to the preamble of claim 1, the cleaning device is completely moved out laterally from the casting line or located above the casting product part of the cleaning device is removed.

Further embodiments of the method will become apparent from the relevant subclaims.

The invention also relates to a device for carrying out the method according to the invention, in which rails are provided on which the cleaning device can be moved out of the casting line or the part of the cleaning device located above the cast product is detachable and can be lifted out by means of a lifting device.

Further embodiments of the device will become apparent from the relevant subclaims.

A decisive advantage of the method according to the invention is, inter alia, that with controllable adjustment options for the amount and / or the effective width and / or the pressure of the flowable media are controlled separately for the upper and lower media supply at any time.

As a result, loose scale and other foreign matter as early as possible removed from the top and / or bottom of the cast product. With several, additional Facilities, the use of a cleaning device is much more flexible and secure.

With a possibility to adjust the effective width of the cleaning device according to the cast product width, excessive cooling of the cast product edges is avoided. Depending on the design, the cleaning device is also able to follow a casting width change of the current cast product. The width adjustment can be done by a switching device and / or manual means for decommissioning a defined number of media feeds.

With an adjustment for the amount of media and / or the effective width and / or the media pressure, the amount of media can be changed according to the casting speed to control the cooling regardless of the casting speed and the casting material.

The possibility of the previous point is improved if the removal takes place with a remotely controllable drive. This possibility is also improved if flexible media connections or self-closing media couplings eliminate time-consuming disconnection of supply lines.

• * Eine zusätzliche Abspritzung des Gießproduktes mit in Menge und / oder Wirkbreite und / oder Druck einstellbarem fließfähigen Medium, beispielsweise Niederdruckwasser, verhindert den Medienfluss gegen oder mit Gießrichtung.
• * Eine zusätzliche Luftabblasung des Gießproduktes unterstützt den seitlichen Medienabfluss.
• * Mit Auffangrinnen kann das Medium von der Oberseite des Gießproduktes abgeschöpft werden.

With several measures taken individually or together, the residence time of the flowable medium on the Gießproduktoberfläche can be shortened. Depending on the requirements, the devices can be used in front of and / or behind the cleaning device:

• * An additional spray of the cast product with adjustable in quantity and / or effective width and / or pressure flowable medium, such as low-pressure water, prevents the media flow against or with casting direction.
• * An additional air blow of the cast product supports the lateral media drain.
• * With gutters, the medium can be skimmed off the top of the cast product.

The cleaning device is - as far as this is structurally possible - enclosed in a housing. The media jets are optionally collected with gutters and defined laterally derived. To support the medium discharge, a medium flush can be provided in these collecting channels.

• * Manuell von den entsprechenden Steuerbühnen der Gießvorrichtung.
• * Manuell von einem Vor - Ort - Steuerpult.
• * Automatisiert von einem eigens für die Gießproduktreinigung eingesetzten Leitsystem.
• * Bei Kopplung mit einem übergeordneten Leitsystem können Einstellungen, die vom Produktionsprozess abhängig sind, teilweise oder vollständig automatisiert werden, bzw. dem Bedienpersonal als Vorschlagswerte vorgegeben werden.

All setting options described above can be controlled differently. In this case, depending on the setting parameters, the control of one or more, possibly locked against each other points from:

• * Manually from the corresponding control stages of the casting device.
• * Manually from an on - site controller.
• * Automated by a control system specially used for casting product cleaning.
• * When paired with a higher-level control system, settings that depend on the production process can be partially or completely automated or specified to the operating personnel as default values.

The invention enables a more flexible use and a secure production operation of a cleaning device as well as a better cleaning effect and reduction of unwanted side effects. In addition, the settings of the cleaning device can be automatically adapted to the different casting parameters and casting production steps.

An embodiment of the invention will be described in more detail with reference to very schematic drawings.

Fig. 1

in Seitenansicht eine schematische Dünnbrammenanlage,

Fig. 2

in Seitenansicht eine erfindungsgemäße Reinigungsvorrichtung innerhalb der Gießlinie,

Fig. 3a

in Seitenansicht die erfindungsgemäße Reinigungsvorrichtung, geöffnet durch Aufschwenken,

Fig. 3b

in Seitenansicht die erfindungsgemäße Reinigungsvorrichtung außerhalb der Gießlinie (seitlich verfahrbare Ausführung),

Fig. 4

im Detail eine mögliche Anordnung der Spritzeinrichtungen,

Fig. 5

im Detail eine Anordnung von Spritzdüsen (abschaltbare Düsen sind durch unterschiedliche Linienart gekennzeichnet) und

Fig. 6

im Detail eine Anordnung einer Längsabspritzung.

Show it:

Fig. 1

in side view a schematic thin slab plant,

Fig. 2

in side view of a cleaning device according to the invention within the casting line,

Fig. 3a

in side view, the cleaning device according to the invention, opened by swinging,

Fig. 3b

in side view, the cleaning device according to the invention outside the casting line (laterally movable design),

Fig. 4

in detail a possible arrangement of the spraying devices,

Fig. 5

in detail an arrangement of spray nozzles (shut-off nozzles are characterized by different line type) and

Fig. 6

in detail, an arrangement of a Längsabspritzung.

In FIG. 1 a casting plant 1 is shown. The casting product 3 emerging from a casting device 2 is deflected by means of rollers 4 from a vertical to a horizontal position. Next, the cast product 3 undergoes a cleaning device 5. In the cleaning device 5, scale and other foreign matter are removed from the top and / or bottom of the cast product 3. For further processing, for example in a rolling mill 6, the cast product 3 is heated in a heating device 7. In the cleaning device 5, at least one spraying device 8 arranged above the cast product 3 and at least one spraying device 3 arranged underneath the cast product 3 are provided Spraying device 9 is provided. Before or after the cleaning device 5, a separating device 28 (eg scissors) is arranged.

An example of a cleaning device 5 is shown in FIG FIG. 2 shown in more detail. The built on a foundation 10 / mounted cleaning device 5 consists of an upper frame 11 and a lower frame 12. On the upper frame 11 and the lower frame 12 injection devices 8, 9 are attached. The spraying devices 8, 9 are equipped with a multiplicity of nozzles 13. The spray devices 8, 9 are supplied via lines 14, 15 with a flowable medium. For deriving the flowable medium 16 baffles 17, 18 are mounted below the casting line.

The upper frame 11 is pivotally mounted and can be pivoted by means of a hydraulic cylinder 21 from the casting line 16, as in FIG. 3a shown.

Alternatively, the cleaning device 5 is mounted on rails 19, 20 movable and can be driven by means of a hydraulic cylinder 21 from the casting line 16. FIG. 3b shows the alternative described cleaning device 5 outside of the casting line 16. In the illustrated embodiment, the upper frame 11 and the subframe 12 is formed in a U - shape. The free ends 22, 23 are adjusted to stabilize the cleaning device 5 by means of bolts 24, 25 in corresponding holes of an abutment 26.

In detail is in FIG. 4 an arrangement with two arranged above the casting product 3 spraying devices 8 and arranged below the casting product 3 spraying device 9 is shown. The nozzles 13 are aligned so that they spray the wettable medium in the casting direction 16 or against the casting direction 16 on the cast product 3. For this purpose, the nozzles 13 can be aligned, for example, at a fixed angle.

The two injection devices 8 arranged above the casting product 3 are aligned with one another. This reduces leakage of the flowable medium into or against the casting direction.

In FIG. 5 an arrangement of nozzles 13 is shown in detail. The spray cone 29 are designed so that an overlap occurs. The surface of the cast product 3 is therefore completely charged with the flowable medium.
By design measures, a defined number of externally arranged nozzles can be switched off.

FIG. 6 shows a number of nozzles 13, which are arranged for an alternative Längsabspritzung.

LIST OF REFERENCE NUMBERS

1.

casting plant

Second

caster

Third

cast product

4th

roll

5th

cleaning device

6th

rolling train

7th

heater

8th.

spraying device

9th

spraying device

10th

foundation

11th

top frame

12th

subframe

13th

jet

14th

management

15th

management

16th

casting line

17th

Conduction

18th

Conduction

19th

rail

20th

rail

21st

hydraulic cylinders

22nd

free end

23rd

free end

24th

bolt

25th

bolt

26th

thrust bearing

27th

spray cone

28th

separating device

Claims (22)

1. Method for removing loose scale and other foreign bodies from the upper side and/or lower side of a cast product (3) such as slab, thin slab, section or the like with the assistance of flowable media, which are sprayed onto the cast product (3) by means of a cleaning device (5) consisting of at least one spray device (8) arranged above and spray device (9) arranged below the cast product (3), wherein a heating device (7) and a roll train (6) are arranged downstream of the cleaning device (5) and the quantity of media and/or the effective width and/or the media pressure are controlled separately and independently in terms of time for each spray device (8, 9), wherein the feed of media can be completely stopped, characterised in that the cleaning device (5) is moved completely laterally out of the casting line (16) or the part of the cleaning device (5) disposed above the cast product (3) is removed.
2. Method according to claim 1, characterised in that the cleaning device (5) is operated with at least one static spray device (8, 9).
3. Method according to claim 1 or 2, characterised in that the cleaning device (5) is operated with at least one movable spray device (8, 9).
4. Method according to any one of claims 1 to 3, characterised in that the cleaning device (5) is operated in the low-pressure range.
5. Method according to any one of claims 1 to 3, characterised in that the cleaning device (5) is operated in the high-pressure range.
6. Method according to any one of claims 1 to 5, characterised in that the setting possibilities of the spray devices (8, 9) are operated independently of the casting speed and/or the casting material.
7. Method according to any one of claims 1 to 6, characterised in that the cleaning device (5) is enclosed by a housing.
8. Method according to claim 1, characterised in that the movement out or lifting away of the cleaning device (5) is carried out by a remotely controllable drive.
9. Method according to any one of claims 1 to 8, characterised in that the cleaning device (5) is connected with supply lines (14, 15) by flexible media connections.
10. Method according to any one of claims 1 to 9, characterised in that the cleaning device (5) is connected with supply lines (14, 15) by self-closing media couplings.
11. Method according to any one of claims 1 to 10, characterised in that an additional spraying onto the cast product (3) by medium settable in quantity and/or pressure prevents media flow against or in casting direction (16).
12. Method according to any one of claims 1 to 11, characterised in that at least one additional air blowing assists the lateral flowing away of media.
13. Method according to any one of claims 1 to 12, characterised in that the medium is skimmed off the upper side of the cast product (3) by collecting channels.
14. Method according to any one of claims 11 to 13, characterised in that the additional devices (spraying-away device, air-blowing device, collecting device) are inserted in front of and/or behind the cleaning device (5).
15. Method according to any one of the preceding claims, characterised in that the control of the cleaning device (5) is coupled in terms of operation with a superordinate control system.
16. Method according to any one of the preceding claims, characterised in that the settings of the cleaning device (5), which are dependent on the production process, are operated partly or fully automatically.
17. Method according to any one of the preceding claims, characterised in that the settings of the cleaning device (5), which are dependent on the production process, are preset by the operative as proposed values.
18. Device for removing loose scale and other foreign bodies from the upper side and/or lower side of a cast product (3) with the assistance of flowable media, which are sprayed onto the cast product (3) by means of a cleaning device (5) consisting of at least one spray device (8) arranged above and spray device (9) arranged below the cast product (3), and a heating device (7) and a roll train (6) are arranged downstream of the cleaning device (5), wherein the spray devices (8, 9) and/or the nozzles (13) arranged at the spray devices (8, 9) are constructed to be responsive to a control / control system, wherein constructional measures are provided by which a defined number of outwardly arranged nozzles can be switched off, particularly for performance of a method according to any one of claims 1 to 17, characterised in that rails (18, 20) on which the cleaning device can be moved out of the casting line are arranged or the part of the cleaning device (5) disposed above the cast product (3) is constructed to be removable.
19. Device according to claim 18, characterised in that the cleaning device (5) is constructed with an enclosing housing.
20. Device according to claim 18 or 19, characterised in that the cleaning device (5) is of two-part construction.
21. Device according to any one of claims 18 to 20, characterised in that the cleaning device (5) is of single-part construction.
22. Device according to any one of claims 18 to 21, characterised in that the lines (14, 15) are constructed with flexible media connections and/or self-closing media couplings.

Images