EP1077095B1 - Descaling device for a continuously cast metal strip - Google Patents

Abstract

Device for hydromechanically de-scaling continuously cast slabs and/or hot-rolled metal strips made of steel comprises water spraying nozzles (1, 1') for spraying high pressure water jets (10, 10') onto the both sides of the strip surfaces. The nozzles can be tilted together with the water collecting channels (2) about an axis and can be adjusted in height opposite the strip surface according to signals from a measuring device. The collecting channels are tilted against the strip running direction about a tilting point (9) independently of the nozzles.

Description

The invention relates to a device for the hydromechanical descaling of continuously cast slabs and / or hot-rolled metal strip, in particular steel, comprising in each case one band side, in the belt running direction behind each other and laterally staggered arranged water spray nozzles for spraying high-pressure water jets on the two-sided tape surfaces, of which The rows of nozzles associated with the upper side of the band together with collecting channels can each be pivoted about an axis and can be adjusted in height relative to the band upper side in accordance with the signal of a measuring device.

When hot rolling slabs and slabs, the slag must be removed before rolling to obtain a good surface. It is known to perform such descaling by means of high-pressure water from nozzle devices at pressures up to 1000 bar. It is known that fixed upper and lower nozzles are arranged at a relatively large distance from the belt surface, so that Banddikkenunterschiede and belt waves are compensated. Disadvantage is that on the "wave mountain" the Entzunderungsparameter (Impact, distance, coverage, etc.) are optimal, but are bad on the "flat" band.

A known descaling device for descaling with high-pressure water is described in DE 43 28 303 A1. In the nozzle device known therefrom, a series of rotating nozzle heads each having four circumferentially spaced nozzles for spraying the high pressure water on a bar immovable and arranged transversely to the direction of movement of the conveyed below rolled bar at such a distance that bulges and bumps on the nozzle device do not lead to a collision along conveyed rolling stock. As a result, this distance is comparatively large. This reduces the jet pressure of the high-pressure water at the rolling stock, which can only be compensated by increasing the water pressure or the amount of water and requires a large amount of energy.

In order to avoid this disadvantage, a device for descaling semifinished products has been proposed by German patent application P 198 17 002.5, which applies a fluid to the surface of the semifinished product moved relative to the nozzle device under high pressure and optionally comprises a device for removing the scale , with which a more uniform Entzonderungspralldruck, the so-called Impact, and thus a more uniform descaling over the bandwidth and length can be achieved as in conventional devices. For this purpose, means are provided for the direct detection of the strip profile, wherein depending on this, the nozzle device and / or the tinder removal device are each individually height-adjustable.

The document EP 0 360 480 B1 describes a descaling device for a material strip with a device for bending the strip by at least one bending roll at one point, and a water spraying device which sprays the water at a descaling point slightly spaced from the bending point in the strip running direction. Due to the bending of the band, the scale should be broken or detached from the surface of the band, whereby the descaling even at a comparatively lower water pressure can be performed.

The document WO 97/117 97 describes a device for descaling semi-finished products. In this case, a nozzle device with a vertical component on the surface of the semi-finished product is arranged to be movable by means of a drive and there is provided a displacement sensor for detecting the distance of the nozzle device from the surface. Furthermore, a control device for influencing the drive is provided as a function of an output signal of the displacement transducer for keeping the distance constant.

The document DE 29 22 701 C2 discloses a device for descaling hot rolled metal strip in a strip rolling line in which the strip is cold rolled after descaling in downstream rolling stands. There are each one band side associated, in the strip running direction one behind the other, but provided mutually offset nozzle rows for irradiating Entzunderungsmittel. Each nozzle row parallel to the belt plane is pivotable by means of a holder about an axis perpendicular to the belt plane and the belt longitudinal axis at an adjustable angle α to the belt longitudinal center axis and is maintained at an inclination angle, the so-called jet angle β of the nozzle axes to the belt surface of less than 90 °. The holder of a nozzle row bearing nozzle bearing block has a pivoting device for varying the angle of inclination or Strahlauftreffwinkels β of the nozzle axes to the strip surface while maintaining intersections of the nozzle axes with the band level.

Proceeding from this, the present invention seeks to provide a device for hydromechanical descaling mentioned in the preamble of claim 1, which compared to the prior art to an extremely effective Function unit is developed further and has the significant advantages in the event of an accident.

The solution of the problem is achieved with the device according to the characterizing features of claim 1, according to which the water collecting channels are independent of the water spray nozzles pivotable about a pivot point and height adjustable with respect to the metal band and are independently evasive and then the nozzle rows receiving spray bars the top of the tape a lever arm around the pivot point of the water collecting channels freely pivotable and thus height adjustable within limits and are arranged automatically evasive. These measures significantly reduce the risk of accidents with the metal strip.

In the inventive embodiment of the device is provided that the nozzle rows are arranged together with the receiving them spray bar and collapsible collecting rings on the top of the tape within a nozzle rows and spray bars with their pivot axes receiving hood, the hood of four corners the upper driver rollers respectively associated lifting cylinders worn.

With the inventive design of the Entzunderrungsvorrichtung an extremely compact design is realized, wherein the injection and collecting gutters receiving hood with the support of the four corner-mounted lifting cylinder, for example, in an upwardly bent head-side hinge part, immediately liftable and repair and / or maintenance is simplified ,

Further embodiments of the invention are provided according to the subclaims.

Figur 1

in Seitenansicht und im Längsschnitt einen Zunderwäscher nach der Erfindung;

Figur 2

in Seitenansicht und im Längsschnitt den Zunderwäscher gemäß Fig. 1 mit angehöbenem Oberteil.

Details, features and advantages of the invention will become apparent from the following explanation of an embodiment schematically illustrated in the drawings. Show it:

FIG. 1

in side view and in longitudinal section a scale washer according to the invention;

FIG. 2

in side view and in longitudinal section the tinder scrubber of FIG. 1 with angehöbenem upper part.

The apparent from the synopsis of Figures 1 and 2 apparatus for hydromechanical descaling of continuously cast slabs and / or hot-rolled metal strip 20, in particular steel, each one band side 3, 4 associated, in the tape running direction one behind the other and laterally offset from each other in series arranged water spray nozzles 1, 1 'for spraying high-pressure water jets 10, 10' with about 600 bar on the two-sided tape surfaces. The rows of nozzles 1 associated with the upper side 3 of the band are pivotable together with collecting channels 2 in each case around an axis parallel to the strip surface and perpendicular to the longitudinal plane of the strip and are adjustable in height relative to the strip upper side 3 in accordance with the signal of a measuring device (not shown). The rows of nozzles 1 are arranged together with the receiving them spray bar 5 and cooperating collecting channels 2 on the upper side of the tape 3 within this with their pivot axes receiving hood 6. The hood 6 is supported by four cornering the upper drive rollers 8 each associated lifting cylinders 7. The interior of the hood 6 is relatively generously sized in height, width and length to avoid interference edges and Verwirbelungszonen for water and scale.

The hood 6 can be decoupled by means of a releasable connection with the driver rollers 8. For example, in Figure 2, the hood 6 is shown in the raised position, wherein after disconnecting the driver roller 8 of left-side Anstellzylindern 7, the dashed line driver roller 8 'further cooperates with the counter-roller below the belt 20 and the belt can be pulled.

In Figures 1 and 2 is further shown that in the upper region of the hood 6, laterally from the belt 20, collecting channels 2 'are provided for water and scale from the underside of the band 4 associated spray nozzles 1`.

The inventive design of the scale washer is designed so that the upper part with hood 6, lifting cylinders 7, drive rollers 8 and pipe connections for the purpose of repair and / or maintenance is preferably lifted by crane.

Furthermore, it is provided that are arranged at a comparatively close distance in front of the scale scrubber spray tubes 13 for low pressure water, for example, 10 bar for breaking the scale by spontaneous Temperaturabschreckung. Very helpful can also be provided that behind the scale scrubber at least one spray tube 13 'is arranged for the final cleaning of the belt 20 of dissolved scale.

The spray bars 5 'of the lower side 4 of the band can be lowered independently of the spray bars 5 of the band upper side 3. In this case, the belt 20 runs, as is generally customary, on drivable transport rollers of the roller table 14.

The water collecting channels 2 are pivotable against a pivot point 9, independently of the water spraying nozzles 1, and are automatically height-adjustable with respect to the belt 20 with their catching mouth 12. This results in the advantage that when undisturbed operating condition, the jaw 12 of the gutter 2 on the belt surface 3 of the belt 20 slid loosely along slides, but when occurring, for example, a bent-head band head (Fig. 1 left side) automatically by pivoting about the fulcrum. 9 of the Tape surface is lifted. This will prevent disasters in the scale washer with great advantage.

It is further provided that the spray bar 5 of the tape top 3, as can be seen in Figure 1, with a lever arm 11 about the center of gravity 9 of the water collecting channels 2 freely pivotable and thus height adjustable within limits and automatically arranged evasive in front of an obstacle. In addition, the spray nozzles 1, 1 'angle adjustable and preferably at an acute angle α opposite to the tape running direction against the belt adjustable.

An embodiment of the device provides, as shown in Figure 2, that the hood 6 together with the spray bar 5 and collecting gutters 2 by means of the lifting cylinder 7 is comparatively high for releasing a free passage from the belt 20 can be raised.

As FIGS. 1 and 2 show, the design according to the invention realizes a device for the hydromechanical descaling of continuously cast slabs and / or hot-rolled metal strip, an extremely compact functional unit with significantly reduced susceptibility to interference.

Claims (11)

1. Device for hydromechanical descaling of continuously cast slabs and/or hot-rolled metal strip (20), particularly of steel, comprising water spray nozzles (1, 1'), which are associated with each strip side (3, 4) and are arranged in succession in strip running direction as well as laterally offset relative to one another, for spraying high-pressure water jets (10, 10') onto the strip surfaces at both sides, of which the nozzle rows (1) associated with the strip upper side (3) together with collecting channels (2) are respectively pivotable about an axis and adjustable in height relative to the strip upper side (3) in dependence on the signal of a metering device, characterised in that the water collecting channels (2) are pivotable against the strip running direction about a pivot point (9) and independently of the water spray nozzles (1) and are adjustable in height relative to the metal strip (20) and automatically deflectable and that the spray bars (5), which receive the nozzle rows, of the strip upper side (3) are arranged to be freely pivotable by a lever arm (11) about the pivot point (9) of the water collecting channels (2) and thus adjustable in height within limits as well as automatically deflectable.
2. Device according to claim 1, characterised in that the nozzle rows (1) together with the spray bars (5) receiving them as well as collecting channels (2) co-operable therewith are arranged on the strip upper side (3) within a hood (6) receiving the nozzle rows and spray bars together with their pivot axes, and that the hood (6) is carried by four stroke cylinders (7) standing at the corners and respectively associated with the upper drive rollers (8).
3. Device according to claim 1 or 2, characterised in that the spray bars (5') of the strip lower side (4) can be lowered independently of the spray bars (5) of the strip upper side (3).
4. Device according to one of claims 1 to 3, characterised in that the water spray nozzles (1, 1') are angularly adjustable and preferably settable at an acute angle (α) relative to the metal strip oppositely to the strip running direction.
5. Device according to one of claims 1 to 4, characterised in that the inner space of the hood (6) is dimensioned to be comparatively spacious in height, width and length for avoidance of disturbing edges and turbulence zones for water and scale.
6. Device according to one of claims 1 to 5, characterised in that the hood (6) can be decoupled from the drive rollers (8) by means of a detachable connection.
7. Device according to one of claims 1 to 6, characterised in that collecting channels (2') for water and scale from the spray pipes (1') associated with the strip lower side (4) are provided in the upper region of the hood (6) laterally of the metal strip (20).
8. Device according to one of claims 1 to 7, characterised in that the upper part of the scale washer together with hood (6), stroke cylinders (7), drive rollers (8) and pipe connections can be raised, preferably by means of a crane for the purpose of repair and/or maintenance.
9. Device according to one of claims 1 to 8, characterised in that the hood (6) together with spray bars (5) and collecting channels (2) can be raised by means of the stroke cylinders (7) for freeing a free passage of the metal strip (20).
10. Device according to one of claims 1 to 9, characterised in that spray pipes (13) for low-pressure water of, for example, 10 bar are arranged at a comparatively close spacing in front of the scale washer.
11. Device according to one of claims 1 to 10, characterised in that at least one spray pipe (13') is arranged behind the scale washer.

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