EP1077095A2 - 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 hydromechanical descaling continuously cast slabs and / or hot-rolled metal strip, in particular made of steel, each associated with a hinge side, in the direction of belt travel water spray nozzles arranged one behind the other and laterally offset from one another for spraying high-pressure water jets onto the belt surfaces on both sides, of which the rows of nozzles assigned to the upper side of the strip come together with gutters each pivotable about an axis and in accordance with the Signals of a measuring device are adjustable in height relative to the top of the belt are.

Wellenberg" die Entzunderungsparameter (Impact, Abstand, Überdeckung usw.) optimal sind, aber auf dem flachen" Band schlecht sind. When hot rolling slabs and strips, the scale must be removed before rolling to achieve a good surface. It is known to carry out such descaling by means of high-pressure water from nozzle devices at pressures of up to 1000 bar. It is known that fixed upper and lower nozzles are arranged at a relatively large distance from the strip surface, so that strip thickness differences and strip waves are compensated for. The disadvantage is that on the

Wellenberg "the descaling parameters (impact, distance, coverage, etc.) are optimal, but on the flat "ribbon are bad.

A known descaling device for descaling with high pressure water is in DE 43 28 303 A1. In the known nozzle device a row of rotating nozzle heads, each with four distributed over the circumference Nozzles for spraying the high pressure water on a stationary and arranged transversely to the direction of movement of the rolling stock conveyed underneath Beams spaced such that bulges and bumps of the rolling stock conveyed along the nozzle device does not become one Collision. As a result, this distance is comparatively large. This reduces the jet pressure of the high pressure water on the rolling stock, which can only be increased the water pressure or the amount of water can be compensated and one requires large amounts of energy.

In order to avoid this disadvantage, the previously unpublished German Patent application P 198 17 002.5 a device for descaling Semi-finished products are proposed, which are on the surface of the relative to the nozzle device fluid moves under high pressure, as well as optionally a device for removing the scale, with which a more uniform Descaling impact pressure, the so-called impact, and thus a more uniform Descaling over the bandwidth and length than with conventional ones Facilities can be reached. Means are provided for this directly Detecting the strip profile, the nozzle device and / or depending on this the scale removal device is individually adjustable in height.

Document EP 0 360 480 B1 describes a descaling device for a Material band with a device for bending the band by at least one Bending roller at one point, and a water spray device that the water at a distance slightly from the bending point in the tape running direction Descaling point sprayed on. By bending the tape, the tinder should be broken open or detached from the surface of the belt, causing descaling already carried out at a comparatively lower water pressure can be.

Document WO 97/117 97 describes a device for descaling Semi-finished products. Here, a nozzle device with a vertical component is over the surface of the semi-finished product is movably arranged by means of a drive and it is a displacement sensor for detecting the distance of the nozzle device from provided the surface. Furthermore, a control device for influencing of the drive depending on an output signal from the displacement sensor Keeping the distance constant is provided.

Document DE 29 22 701 C2 discloses a device for descaling hot-rolled metal strip in a strip mill, in which the strip after the Descaling is cold rolled in downstream rolling stands. They are each assigned to a hinge side, one behind the other in the direction of the hinge, but offset rows of nozzles arranged to each other for the blasting of descaling agents intended. Each row of nozzles parallel to the belt level is by means of a holder about an axis perpendicular to the belt plane and to the belt longitudinal center axis an adjustable angle α to the longitudinal axis of the band and is pivotable with an angle of inclination, the so-called jet impact angle β of the nozzle axes held at less than 90 ° to the belt surface. The bracket of a row of nozzles stored nozzle bearing block has a swivel device for changing the angle of inclination or jet impact angle β of the nozzle axes Belt surface while maintaining intersection points of the nozzle axes with the band level.

Proceeding from this, the object of the invention is a device for hydromechanical descaling mentioned in the preamble of claim 1 Specify type that is extremely effective compared to the prior art Functional unit is further developed and the significant advantages in the case has an accident.

The problem is solved with the device according to the characteristic Features of claim 1, according to which the water collecting channels the tape running direction by one regardless of the water spray nozzles Swivel point pivotable and height adjustable compared to the metal band are and are independently evasive and after which the receiving the rows of nozzles Spray bar on the top of the belt with a lever arm around the pivot point the water gutter can be swiveled freely and is therefore height adjustable within limits and are arranged to be automatically evasive. With these measures the risk of damage with the metal band is significantly reduced.

In an embodiment of the device according to the invention it is provided that the rows of nozzles together with the spray bars that receive them and can interact with them Collecting rings on the top of the belt within one of the rows of nozzles and spray bars arranged with their swivel axis receiving hood are, the hood of four corner the top driver rollers each associated lifting cylinder is worn.

With the design of the descaling device according to the invention realized an extremely compact design, the spraying and collecting channels receiving hood with support from the four corner lifting cylinders, for example in the case of a band part which is bent upwards at the top, can be raised immediately and repair and / or maintenance is simplified.

Further refinements of the invention are in accordance with the subclaims intended.

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 angehobenem Oberteil.

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

Figure 1

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

Figure 2

in side view and in longitudinal section of the scale washer according to FIG. 1 with the upper part raised.

The apparent from the overview of Figures 1 and 2 device for hydromechanical descaling of continuously cast slabs and / or hot-rolled metal strip 20, in particular made of steel, each comprises one Belt side 3, 4 assigned, one behind the other in the belt running direction and laterally to each other water spray nozzles 1, 1 'arranged in a row for spraying of high pressure water jets 10, 10 'at about 600 bar on both sides Belt surfaces. The nozzle rows 1 assigned to the belt top 3 are together with gutters 2 each around a parallel to the belt surface and Belt longitudinal center plane vertical axis can be swiveled and are made to measure the signal of a measuring device (not shown) opposite the top 3 height adjustable. The rows of nozzles 1 are together with the ones receiving them Spray bar 5 and thus interacting gutters 2 on the Band top 3 within a receiving these with their pivot axes Hood 6 arranged. The hood 6 is of four corner the top driver roles 8 each associated lifting cylinders 7 worn. The interior of the Hood 6 is in height, width and length to avoid interfering edges and turbulence zones comparatively generous for water and scale.

The hood 6 can be uncoupled from the driver rollers 8 by means of a detachable connection. For example, the hood 6 is shown in the raised position in FIG. 2, after decoupling the driver roller 8 from left-hand jack cylinders 7 the Driver roller 8 'shown in dashed lines continues with the counter roller below the Band 20 cooperates and the band can be pulled.

In Figures 1 and 2 it is further shown that in the upper region of the hood 6, to the side of band 20, gutters 2 'for water and scale from the Belt underside 4 associated spray nozzles 1 'are provided.

The construction of the scale washer is designed so that the upper part with hood 6, lifting cylinders 7, driver rollers 8 and pipe connections can preferably be lifted off by means of a crane for repair and / or maintenance.

It is also provided that in a comparatively close distance in front of the scale washer Spray tubes 13 for low pressure water of 10 bar, for example Breaking up the scale arranged by spontaneous temperature quenching are. It can also be very helpful to provide that behind the scale washer at least one spray tube 13 'for the final cleaning of the strip 20 from dissolved scale is arranged.

The spray bars 5 'of the belt underside 4 are independent of the spray bars 5 the top of the belt 3 can be lowered. The belt 20 runs, as is generally customary, on drivable transport rollers of the roller table 14.

The water gutters 2 are independent of the direction of belt travel the water spray nozzles 1 can be pivoted about a pivot point 9 and are opposite the band 20 with its mouth 12 automatically adjustable in height. Hereby there is the advantage that the mouth is in an undisturbed operating state 12 of the gutters 2 lying loosely on the belt surface 3 of the belt 20 slides along, but if, for example, an upturned ribbon head occurs (Fig. 1 left side) automatically by pivoting about the pivot point 9 from the Belt surface is lifted off. As a result, accidents in the Tinder washer prevented.

It is also provided that the spray bar 5 of the belt top 3, like this can be seen from Figure 1, with a lever arm 11 around the center of gravity 9 of the Water collecting channels 2 can be swiveled freely and thus adjusted in height within limits and are automatically arranged to avoid an obstacle. Furthermore the spray nozzles 1, 1 'are adjustable in angle and preferably at a point Angle α opposite to the tape running direction adjustable against the tape.

An embodiment of the device provides, as shown in Figure 2, that the hood 6 together with the spray bar 5 and gutters 2 by means of Lift cylinder 7 comparatively high to release a free passage from Band 20 can be raised.

As FIGS. 1 and 2 show, the design according to the invention realizes one 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 faults.

Claims (11)

Device for the hydromechanical descaling of continuously cast slabs and / or hot-rolled metal strip (20), in particular made of steel, comprising water spray nozzles (1, 1 '), each assigned to a strip side (3, 4), one behind the other in the strip running direction and laterally offset from one another, for spraying high pressure - Water jets (10, 10 ') onto the belt surfaces on both sides, from which the rows of nozzles (1) assigned to the belt top (3) together with collecting channels (2) can each be pivoted about an axis and in accordance with the signal of a measuring device relative to the belt top (3) are height adjustable,
characterized by it
that the water collecting troughs (2) can be pivoted about a pivot point (9) counter to the direction of belt travel independently of the water spray nozzles (1) and are height-adjustable and automatically evasive relative to the metal belt (20) and that the spray bars (5) on the top of the belt (3) receiving the nozzle rows with a lever arm (11) about the pivot point (9) of the water collecting channels (2) can be freely pivoted and are thus height-adjustable within limits and can be automatically evacuated Device according to claim 1,
characterized by
that the rows of nozzles (1) together with the receiving beams (5) and interchangeable collecting channels (2) on the top of the belt (3) are arranged within a hood (6) receiving the rows of rows and spray bars with their swivel axes, and that Hood (6) is carried by four corner-mounted lifting cylinders (7), each assigned to the upper driver rollers (8). Device according to claim 1 or 2,
characterized by
that the spray bars (5 ') of the belt underside (4) can be lowered independently of the spray bars (5) of the belt top (3). Device according to one or more of claims 1 to 3,
characterized by
that the water spray nozzles (1, 1 ') are adjustable in angle and preferably at an acute angle (α) opposite to the strip running direction against the metal strip. Device according to one or more of claims 1 to 4
characterized
that the interior of the hood (6) is comparatively generous in height, width and length to avoid interference edges and turbulence zones for water and scale. Device according to one or more of claims 1 to 5,
characterized by
that the hood (6) can be uncoupled from the driver rollers (8) by means of a detachable connection. Device according to one or more of claims 1 to 6,
characterized by
that in the upper area of the hood (6), to the side of the metal band (20), collecting channels (2 ') for water and scale are provided from the spray pipes (1') assigned to the underside (4) of the band. Device according to one or more of claims 1 to 7,
characterized by
that the upper part of the scale washer with hood (6), lifting cylinders (7), driver rollers (8) and pipe connections for repair and / or maintenance can preferably be lifted off by crane. Device according to one or more of claims 1 to 8,
characterized by
that the hood (6) together with the spray bar (5) and gutters (2) can be raised by means of the lifting cylinder (7) to release a free passage from the metal strip (20). Device according to one or more of claims 1 to 9,
characterized by
that spray pipes (13) for low-pressure water of, for example, 10 bar are arranged at a comparatively close distance from the scale washer. Device according to one or more of claims 1 to 10
characterized by
that at least one spray tube (13 ') is arranged behind the scale washer.

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