EP0852521B1 - Device for de-scaling semi-finished products - Google Patents

Device for de-scaling semi-finished products Download PDF

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Publication number
EP0852521B1
EP0852521B1 EP96933348A EP96933348A EP0852521B1 EP 0852521 B1 EP0852521 B1 EP 0852521B1 EP 96933348 A EP96933348 A EP 96933348A EP 96933348 A EP96933348 A EP 96933348A EP 0852521 B1 EP0852521 B1 EP 0852521B1
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EP
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Prior art keywords
nozzle device
semi
nozzle
finished product
drive
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EP96933348A
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German (de)
French (fr)
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EP0852521A1 (en
Inventor
Jürgen GAYDOUL
Wolfgang Gieseler
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Hermetik Hydraulik AB
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Hermetik Hydraulik AB
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/04—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing
    • B21B45/08—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing hydraulically

Definitions

  • the invention relates to a device for descaling Semi-finished products with the features of the preamble of the claim 1.
  • a known device of this type JP-A-52 28 5266
  • the upper part of a nozzle device is by means of a vertical lifting device to compensate for fluctuations in thickness of the semi-finished product to be descaled starting from Signals from a thickness sensor are controlled so that the distance between the nozzle orifices of the upper nozzle device and the surface of the semi-finished product remains constant.
  • This distance is comparative in the known device large. This reduces the jet pressure of the high pressure water on the workpiece. A sufficiently high jet pressure can only by increasing the water pressure or the amount of water can be achieved, which results in a large energy input Has. Reducing the distance of the nozzle device from the belt surface is due to the risk of collision described above not possible.
  • the invention has for its object a device of the type described so that the distance reduced between the belt surface and the nozzle device can be.
  • Claim 1 serves to achieve this object.
  • the nozzle device due to their movable arrangement for movement with a vertical component over the surface of the Semi-finished product of a band unevenness or a bulge at the beginning of the tape in compliance with a preselected small Setpoint distance automatically tracked by the control device.
  • the water pressure in the nozzle or the amount of water can thus be reduced using the invention, resulting in a reduction in cooling in particular leads to thin-walled semi-finished products (thin slabs).
  • the distance can be compared to one Distance of the nozzle device in the range of 250 mm at the known device to 20 to 40 mm, i.e. so up to reduce a tenth. This leads to very significant advantages both in terms of the quality of descaling as also in terms of reducing water and energy consumption and avoiding unnecessary cooling of the semi-finished product.
  • a scale removal device in the same way the bulges or unevenness of the semi-finished product is tracked.
  • the scale removal device in the same way as the Nozzle device with a vertical component movable over the surface of the tape passed underneath be.
  • the invention is based on the drawing with others Details explained in more detail.
  • the only figure shows a schematic side view in the direction transverse to the direction of movement seen a device of the band to be ignited according to the invention.
  • the slab 4 has a bulge 8, which extends over a section or over the total width of the slab 4 can extend.
  • the nozzle device 10 has several, arranged in a row transversely to the direction of movement 6 Nozzle heads 12, each with a total of four Circumference evenly distributed nozzles 14 for spraying High pressure water. There is only one in the drawing to see such a nozzle head 12.
  • the overall arrangement is clearer described in DE 43 28 303 A1. While there, however the nozzle heads on one rigidly above the roller table 2 arranged bars are attached, they are according to the invention attached to a beam 16 by means of a parallel linkage with handlebars 18, 20 vertically in the direction of Arrow 21 can be raised and lowered on a fixed support 23 is held. On the upper link 20 of the parallel linkage attacks a hydraulic cylinder 22 for this purpose.
  • a scale removal device designated as a whole by reference numeral 24 is shown at 24.
  • This scale removal device has a collection housing 26 for from the slab surface rebounded tinder with a baffle 28, of which from the tinder mixed with the high pressure water into one Discharge channel 30 is deflected.
  • the housing 26 is on one vertical bars 32 attached. This bar 32 is over a parallel linkage with links 34, 36 on the carrier 23 hung.
  • the lower link 34 is a hydraulic Cylinder 38 acted upon.
  • the displacement sensor detects the vertical one Distance a between the nozzle device 10 and the Scale removal device 24 and the belt surface.
  • the displacement sensor can be mechanical, optical or be electrically trained and converts the detected distance into an electrical signal via a signal line 42 is fed into a control device 44.
  • This control device is at a desired target distance a at 46 adjustable.
  • the control device 44 compares the measured one Actual distance with the set target distance and provides control signals to reduce the detected deviation ready to zero via signal lines 48, 49 to the cylinders 22, 38 are guided and these for lifting or lowering affect the bars 16 and 32 respectively. In this way the nozzle device 10 and the scale removal device 24 always at a desired distance from the surface the slab 4 is held even if it bulges 8 has.
  • a target distance a is expediently included 20 to 40 mm.
  • the bulges are or bumps 8 often not evenly over the spread the entire bandwidth.
  • multi-part devices consisting of independent sections consisting of bars 16, 24 with parallel linkage and cylinders can be provided.
  • the device according to the invention can by means of a Hoist, such as a crane, designed to be liftable from the roller table 2 be. This allows maintenance and control work and tests away from the roller table, e.g. in a factory, be carried out.
  • a Hoist such as a crane

Abstract

PCT No. PCT/EP96/04126 Sec. 371 Date May 20, 1998 Sec. 102(e) Date May 20, 1998 PCT Filed Sep. 20, 1996 PCT Pub. No. WO97/11797 PCT Pub. Date Apr. 3, 1997An apparatus for descaling semi-finished products, such as thin slabs or steel strips in rolling mills by highly pressurized water that is sprayed through a nozzle device onto the surface of the semi-finished product is characterized in that the nozzle device is movable with a vertical component above the surface of the semi-finished product by means of a drive. The drive can be controlled by a control device that receives a target distance as input value and an actual distance between the nozzle device and the surface of the semi-finished product detected by means of a distance sensor. The control device supplies an output signal via a signal line to the drive for resetting any deviation to zero. Hence, the nozzle device is always kept at a desired target distance even if humps such as bulgings occur on the surface of the semi-finished product.

Description

Die Erfindung betrifft eine Einrichtung zum Entzundern von Halbzeugen mit den Merkmalen des Oberbegriffs des Anspruchs 1. Bei einer bekannten Einrichtung dieser Art (JP-A-52 28 526) wird der obere Teil einer Düsenvorrichtung mittels einer vertikalen Hebevorrichtung zum Ausgleich von Dickenschwankungen des zu entzundernden Halbzeuges ausgehend von Signalen eines Dickensensors so gesteuert, daß der Abstand zwischen den Düsenmündungen der oberen Düsenvorrichtung und der Oberfläche des Halbzeuges konstant bleibt.The invention relates to a device for descaling Semi-finished products with the features of the preamble of the claim 1. In a known device of this type (JP-A-52 28 526) the upper part of a nozzle device is by means of a vertical lifting device to compensate for fluctuations in thickness of the semi-finished product to be descaled starting from Signals from a thickness sensor are controlled so that the distance between the nozzle orifices of the upper nozzle device and the surface of the semi-finished product remains constant.

Beim Warmwalzen von Brammen und Bändern muß zu Erzielung einer guten Oberfläche der Zunder vor dem Walzen entfernt werden. Es ist bekannt, eine solche Entzunderung mittels Bestrahlen durch Hochdruckwasser bei Drücken um 1000 bar vorzunehmen. Eine bekannte Entzunderungseinrichtung zum Entzundern mit Hochdruckwasser ist in der DE 43 28 303 A1 beschrieben. Bei der daraus bekannten Düsenvorrichtung ist eine Reihe von rotierenden Düsenköpfen mit jeweils vier über den Umfang verteilten Düsen zum Verspritzen des Hochdruckwassers an einem unbeweglich und quer zur Bewegungsrichtung des darunter geförderten Bandes angeordneten Balken in einem solchen Abstand angebracht, daß Aufwölbungen und Unebenheiten des an der Düsenvorrichtung vorbei geförderten Bandes nicht zu einer Kollision führen.When hot rolling slabs and strips must be achieved a good surface of the scale removed before rolling become. Such descaling by means of irradiation is known by high pressure water at pressures around 1000 bar. A known descaling device for descaling with high pressure water is described in DE 43 28 303 A1. In the known nozzle device a series of rotating nozzle heads, each with four over the circumference distributed nozzles for spraying the high pressure water on one immobile and transverse to the direction of movement of the conveyor belt below it arranged in one such a distance that bulges and bumps of the belt conveyed past the nozzle device do not lead to a collision.

Dieser Abstand ist bei der bekannten Einrichtung vergleichsweise groß. Dies reduziert den Strahldruck des Hochdruckwassers am Werkstück. Ein ausreichend hoher Strahldruck kann nur durch Erhöhung des Wasserdruckes oder der Wassermenge erreicht werden, was einen großen Energieeinsatz zur Folge hat. Ein Verringern des Abstandes der Düsenvorrichtung von der Bandoberfläche ist wegen der oben beschriebenen Kollisionsgefahr nicht möglich.This distance is comparative in the known device large. This reduces the jet pressure of the high pressure water on the workpiece. A sufficiently high jet pressure can only by increasing the water pressure or the amount of water can be achieved, which results in a large energy input Has. Reducing the distance of the nozzle device from the belt surface is due to the risk of collision described above not possible.

Der Erfindung liegt die Aufgabe zugrunde, eine Einrichtung der beschriebenen Art so auszugestalten, daß der Abstand zwischen Bandoberfläche und Düsenvorrichtung verringert werden kann.The invention has for its object a device of the type described so that the distance reduced between the belt surface and the nozzle device can be.

Zur Lösung dieser Aufgabe dient Patentanspruch 1.Claim 1 serves to achieve this object.

Bei einer Einrichtung nach der Erfindung wird die Düsenvorrichtung aufgrund ihrer beweglichen Anordnung zu einer Bewegung mit einer Vertikalkomponente über der Oberfläche des Halbzeuges einer Bandunebenheit oder einer Aufwölbung am Anfang des Bandes unter Einhaltung eines vorgewählten kleinen Sollabstandes von der Steuereinrichtung selbstätig nachgeführt. Dies führt dazu, daß bei am Düsenaustritt gleich gehaltenen Strahldruck der am Werkstück vorhandene Strahldruck erhöht ist. Der Wasserdruck in der Düse bzw. die Wassermenge können also bei Anwendung der Erfindung verringert werden, was gleichzeitig zu einer Verringerung der Abkühlung insbesondere bei dünnwandigen Halbzeugen (Dünnbrammen) führt. In a device according to the invention, the nozzle device due to their movable arrangement for movement with a vertical component over the surface of the Semi-finished product of a band unevenness or a bulge at the beginning of the tape in compliance with a preselected small Setpoint distance automatically tracked by the control device. This leads to the fact that at the nozzle outlet kept the same Blasting pressure is the blasting pressure on the workpiece is increased. The water pressure in the nozzle or the amount of water can thus be reduced using the invention, resulting in a reduction in cooling in particular leads to thin-walled semi-finished products (thin slabs).

In der Praxis läßt sich der Abstand im Vergleich zu einem Abstand der Düsenvorrichtung im Bereich von 250 mm bei der bekannten Einrichtung auf 20 bis 40 mm, d.h. also bis auf ein Zehntel reduzieren. Dies führt zu ganz bedeutenden Vorteilen sowohl hinsichtlich der Qualität der Entzunderung als auch hinsichtlich Verminderung des Wasser- und Energieverbrauchs und Vermeidung unnötiger Abkühlung des Halbzeuges.In practice, the distance can be compared to one Distance of the nozzle device in the range of 250 mm at the known device to 20 to 40 mm, i.e. so up to reduce a tenth. This leads to very significant advantages both in terms of the quality of descaling as also in terms of reducing water and energy consumption and avoiding unnecessary cooling of the semi-finished product.

Es ist bevorzugt, wenn außer der Düsenvorrichtung auch eine Zunderabführvorrichtung in gleicher Weise den Wölbungen oder Unebenheiten des Halbzeuges nachgeführt wird. Hierzu kann die Zunderabführvorrichtung in gleicher Weise wie die Düsenvorrichtung mit einer Vertikalkomponente beweglich über der Oberfläche des darunter vorbei geführten Bandes ausgebildet sein.It is preferred if in addition to the nozzle device a scale removal device in the same way the bulges or unevenness of the semi-finished product is tracked. For this can the scale removal device in the same way as the Nozzle device with a vertical component movable over the surface of the tape passed underneath be.

Vorteilhafte Ausgestaltungen der Erfindung sind im übrigen in den Unteransprüchen angegeben.Advantageous refinements of the invention are otherwise specified in the subclaims.

Die Erfindung ist im folgenden anhand der Zeichnung mit weiteren Einzelheiten näher erläutert. Die einzige Figur zeigt eine schematische Seitenansicht in Richtung quer zur Bewegungsrichtung des zu entzundenden Bandes gesehen eine Einrichtung nach der Erfindung.The invention is based on the drawing with others Details explained in more detail. The only figure shows a schematic side view in the direction transverse to the direction of movement seen a device of the band to be ignited according to the invention.

Auf einem Rollgang 2 wird eine bandförmige Dünnbramme 4 in Bewegungsrichtung des Pfeiles 6 gefördert. Die Bramme 4 hat eine Aufwölbung 8, die sich über eine Teilbreite oder über die Gesamtbreite der Bramme 4 erstrecken kann.A belt-shaped thin slab 4 in. Is on a roller table 2 Direction of movement of the arrow 6 promoted. The slab 4 has a bulge 8, which extends over a section or over the total width of the slab 4 can extend.

Oberhalb der Bramme 4 und in einem Abstand a davon ist eine Düsenvorrichtung angeordnet, die insgesamt mit dem Bezugszeichen 10 bezeichnet ist. Die Düsenvorrichtung 10 weist mehrere, in einer Reihe quer zur Bewegungsrichtung 6 angeordnete Düsenköpfe 12 auf, die jeweils mit insgesamt vier am Umfang gleichmäßig verteilten Düsen 14 zum Aufspritzen von Hochdruckwasser bestückt sind. In der Zeichnung ist nur ein solcher Düsenkopf 12 zu sehen. Die Gesamtanordnung ist deutlicher in der DE 43 28 303 A1 beschrieben. Während dort jedoch die Düsenköpfe an einem starr oberhalb des Rollganges 2 angeordneten Balken befestigt sind, sind sie erfindungsgemäß an einem Balken 16 angebracht, der mittels eines Parallellenkergestänges mit Lenkern 18, 20 vertikal in Richtung des Pfeiles 21 heb- und senkbar an einem ortsfesten Träger 23 gehalten ist. Am oberen Lenker 20 des Parallellenkergestänges greift hierzu ein hydraulischer Zylinder 22 an.Above the slab 4 and at a distance a is one Nozzle device arranged, the total with the reference numeral 10 is designated. The nozzle device 10 has several, arranged in a row transversely to the direction of movement 6 Nozzle heads 12, each with a total of four Circumference evenly distributed nozzles 14 for spraying High pressure water. There is only one in the drawing to see such a nozzle head 12. The overall arrangement is clearer described in DE 43 28 303 A1. While there, however the nozzle heads on one rigidly above the roller table 2 arranged bars are attached, they are according to the invention attached to a beam 16 by means of a parallel linkage with handlebars 18, 20 vertically in the direction of Arrow 21 can be raised and lowered on a fixed support 23 is held. On the upper link 20 of the parallel linkage attacks a hydraulic cylinder 22 for this purpose.

Eine insgesamt mit den Bezugszeichen 24 bezeichnete Zunderabführvorrichtung ist bei 24 gezeigt. Diese Zunderabführvorrichtung hat ein Auffanggehäuse 26 für von der Brammenoberfläche abgeprallten Zunder mit einer Prallfläche 28, von der aus der Zunder vermischt mit dem Hochdruckwasser in eine Abführrinne 30 umgelenkt wird. Das Gehäuse 26 ist an einem vertikalen Balken 32 befestigt. Dieser Balken 32 ist über ein Parallellenkergestänge mit Lenkern 34, 36 an dem Träger 23 aufgehängt. Der untere Lenker 34 wird dabei von einem hydraulischen Zylinder 38 beaufschlagt.A scale removal device designated as a whole by reference numeral 24 is shown at 24. This scale removal device has a collection housing 26 for from the slab surface rebounded tinder with a baffle 28, of which from the tinder mixed with the high pressure water into one Discharge channel 30 is deflected. The housing 26 is on one vertical bars 32 attached. This bar 32 is over a parallel linkage with links 34, 36 on the carrier 23 hung. The lower link 34 is a hydraulic Cylinder 38 acted upon.

Am vorderen Ende der Zunderabführvorrichtung ist ein Wegaufnehmer 40 ausgebildet. Dieser Wegaufnehmer erfaßt den vertikalen Abstand a zwischen der Düsenvorrichtung 10 bzw. der Zunderabführvorrichtung 24 und der Bandoberfläche. Der Wegaufnehmer kann in bekannter Weise mechanisch, optisch oder elektrisch ausgebildet sein und wandelt den erfaßten Abstand in ein elektrisches Signal, das über eine Signalleitung 42 in eine Steuereinrichtung 44 eingespeist wird. Diese Steuereinrichtung ist auf einen gewünschten Sollabstand a bei 46 einstellbar. Die Steuereinrichtung 44 vergleicht den gemessenen Istabstand mit dem eingestellten Sollabstand und stellt Stellsignale zum Vermindern der erfaßten Abweichung auf Null bereit, die über Signalleitungen 48, 49 zu den Zylindern 22, 38 geführt werden und diese zum Heben bzw. Senken der Balken 16 bzw. 32 beeinflussen. Auf dieser Weise werden die Düsenvorrichtung 10 und die Zunderabführvorrichtung 24 stets in einem gewünschten Abstand von der Oberfläche der Bramme 4 auch dann gehalten, wenn diese eine Aufwölbung 8 hat.There is a displacement sensor at the front end of the scale removal device 40 trained. This displacement sensor detects the vertical one Distance a between the nozzle device 10 and the Scale removal device 24 and the belt surface. The displacement sensor can be mechanical, optical or be electrically trained and converts the detected distance into an electrical signal via a signal line 42 is fed into a control device 44. This control device is at a desired target distance a at 46 adjustable. The control device 44 compares the measured one Actual distance with the set target distance and provides control signals to reduce the detected deviation ready to zero via signal lines 48, 49 to the cylinders 22, 38 are guided and these for lifting or lowering affect the bars 16 and 32 respectively. In this way the nozzle device 10 and the scale removal device 24 always at a desired distance from the surface the slab 4 is held even if it bulges 8 has.

In der Praxis liegt ein Sollabstand a zweckmäßigerweise bei 20 bis 40 mm.In practice, a target distance a is expediently included 20 to 40 mm.

Bei großen Breiten der Brammen oder Bänder sind die Aufwölbungen oder Unebenheiten 8 oft nicht gleichmäßig über die gesamte Bandbreite verteilt. Um zu vermeiden, daß bei einer örtlichen Aufwölbung oder Erhebung die gesamte Düsenvorrichtung nebst Zunderabführvorrichtung angehoben wird, können mehrteilige, aus unabhängigen Sektionen bestehende Vorrichtungen bestehend aus den Balken 16, 24 mit den Parallellenkergestängen und Zylindern vorgesehen sein.With large widths of the slabs or strips, the bulges are or bumps 8 often not evenly over the spread the entire bandwidth. To avoid that with a local bulge or elevation the entire nozzle device in addition to the scale removal device, can multi-part devices consisting of independent sections consisting of bars 16, 24 with parallel linkage and cylinders can be provided.

Sämtliche beschriebene Baugruppen einschließlich Kupplungen, Schläuche und elektrischer Zuleitungen können in einem gemeinsamen Gehäuse 50 untergebracht sein. Verschleißteile wie Gleitkufen 52 der Zunderabführvorrichtung 24 und Abweisbleche 54, 56 sind austauschbar angeordnet.All described assemblies including couplings, Hoses and electrical leads can be combined in one Housing 50 can be housed. Wear parts like Skids 52 of the scale removal device 24 and deflector plates 54, 56 are arranged interchangeably.

Die Einrichtung nach der Erfindung kann mittels eines Hebezeuges, wie eines Krans, vom Rollgang 2 abhebbar ausgebildet sein. Somit können Wartungs- und Kontrollarbeiten sowie Tests entfernt vom Rollgang, z.B. in einer Werkstatt, ausgeführt werden.The device according to the invention can by means of a Hoist, such as a crane, designed to be liftable from the roller table 2 be. This allows maintenance and control work and tests away from the roller table, e.g. in a factory, be carried out.

Claims (4)

  1. An apparatus for descaling semi-finished products (4), in particular thin slabs or steel strips in rolling mills, by means of highly pressurized water that is sprayed through a nozzle device (10) onto the surface of the semi-finished product which is moved in relation to the nozzle device (10), wherein the nozzle device is arranged for movement by a drive (22) under the control of a sensor adapted to determine the distance (a) of the nozzle device from the surface of the product, said movement having a vertical component with regard to the surface, characterized in that a plurality of nozzle devices (10) is attached at a bar (16) which is mounted at a fixed carrier (23) by means of a four-bar linkage means (18, 20), which is pivotable by the drive (22) and in that a control device (44) is provided for actuating the drive (22) in response to an output signal of the sensor, which is designed as a displacement transducer (40), for keeping constant the distance (a) of the nozzle device (10) from the surface of the semifinished product.
  2. The apparatus as set forth in claim 1, characterized in that the nozzle device (10) comprises a plurality of rotor heads (12) having rotating nozzles (14) disposed in an array extending transversely to the moving direction of the semifinished product (4).
  3. The apparatus as set forth in claim 1, characterized in that the nozzle device comprises a plurality of fixed or oscillatingly mounted nozzles, that are provided in an arrangement supported by the bar (16) and extend transversely to the moving direction of the semi-finished product.
  4. The apparatus as set forth in one of claims 1 to 3, characterized in that a scale discharge device (24) is mounted at the fixed carrier (23) by means of a further linkage means (34, 36) and is vertically movable by a further lift cylinder (38) also controlled by the control device (44) in synchronism with the nozzle device (10).
EP96933348A 1995-09-26 1996-09-20 Device for de-scaling semi-finished products Expired - Lifetime EP0852521B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19535789A DE19535789C2 (en) 1995-09-26 1995-09-26 Device for descaling semi-finished products
DE19535789 1995-09-26
PCT/EP1996/004126 WO1997011797A1 (en) 1995-09-26 1996-09-20 Device for de-scaling semi-finished products

Publications (2)

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EP0852521A1 EP0852521A1 (en) 1998-07-15
EP0852521B1 true EP0852521B1 (en) 1999-06-23

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US (1) US6029681A (en)
EP (1) EP0852521B1 (en)
JP (1) JPH11513311A (en)
KR (1) KR100426979B1 (en)
CN (1) CN1120063C (en)
AT (1) ATE181521T1 (en)
AU (1) AU728947B2 (en)
BR (1) BR9610717A (en)
CA (1) CA2233085A1 (en)
DE (2) DE19535789C2 (en)
ES (1) ES2135921T3 (en)
MX (1) MX9802351A (en)
TW (1) TW312634B (en)
WO (1) WO1997011797A1 (en)
ZA (1) ZA968047B (en)

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WO1997011797A1 (en) 1997-04-03
CN1197416A (en) 1998-10-28
CN1120063C (en) 2003-09-03
JPH11513311A (en) 1999-11-16
KR19990063765A (en) 1999-07-26
ATE181521T1 (en) 1999-07-15
ZA968047B (en) 1997-05-27
DE19535789A1 (en) 1997-03-27
DE19535789C2 (en) 1997-09-11
TW312634B (en) 1997-08-11
EP0852521A1 (en) 1998-07-15
MX9802351A (en) 1998-11-30
CA2233085A1 (en) 1997-04-03
AU7212196A (en) 1997-04-17
ES2135921T3 (en) 1999-11-01
KR100426979B1 (en) 2004-06-16
BR9610717A (en) 1999-07-13
US6029681A (en) 2000-02-29
AU728947B2 (en) 2001-01-18
DE59602292D1 (en) 1999-07-29

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