EP3826779B1 - Roll stand and method for cooling the upper working roll of a roll stand - Google Patents

Roll stand and method for cooling the upper working roll of a roll stand Download PDF

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Publication number
EP3826779B1
EP3826779B1 EP19740369.4A EP19740369A EP3826779B1 EP 3826779 B1 EP3826779 B1 EP 3826779B1 EP 19740369 A EP19740369 A EP 19740369A EP 3826779 B1 EP3826779 B1 EP 3826779B1
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EP
European Patent Office
Prior art keywords
work roll
cooling liquid
cooling
upper work
roll
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EP19740369.4A
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German (de)
French (fr)
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EP3826779A1 (en
Inventor
Ron Beuter
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SMS Group GmbH
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SMS Group GmbH
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
    • B21B27/06—Lubricating, cooling or heating rolls
    • B21B27/10—Lubricating, cooling or heating rolls externally
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
    • B21B27/06—Lubricating, cooling or heating rolls
    • B21B27/10—Lubricating, cooling or heating rolls externally
    • B21B2027/103—Lubricating, cooling or heating rolls externally cooling externally

Definitions

  • the invention relates to a roll stand with at least one upper work roll, at least one cooling device for cooling the upper work roll, with which the upper work roll can be subjected to a cooling liquid on the barrel side, and at least one stripper which is guided towards the upper work roll on the barrel side and with which the from the upper work roll outflowing cooling liquid can be collected on the scraper and stripped off the upper working roll, forming a cooling liquid lake which is delimited on one side by the upper working roll.
  • the invention relates to a method for cooling the upper work roll of a roll stand, wherein the upper work roll is acted upon by a cooling liquid on the barrel side and the cooling liquid flowing out of the upper work roll by means of a scraper that is guided towards the upper work roll on the barrel side, forming a stripper on one side through the upper work roll limited lake of cooling liquid is collected on the scraper and scraped off by the upper work roll.
  • a roll stand for rolling preferably for rolling hot rolling stock, has an upper work roll, a lower work roll and a roll gap therebetween.
  • the work rolls are cooled with a cooling liquid during a rolling process.
  • a scraper is conventionally used which is guided laterally to the upper work roll and with which the cooling liquid flowing off the upper work roll forms a one-sided through the upper work roll limited lake of cooling liquid is collected on the scraper and scraped off by the upper work roll so that the rolling stock guided underneath is not wetted.
  • EP 0 313 516 A1 relates to a roll stand with a device for cooling rolls, in particular in continuous strip casting and in the rolling of metals, wherein the rolls are each covered with a hood that extends from the area of the roll gap over a part of the roll surface and is sealed against the roll, in which means for supplying a cooling medium to parts of the roll surface and for its removal, as well as a drain or suction device for liquid cooling medium collecting in the lower part of the hood.
  • a hood several spray devices extending in the axial direction over the entire length of the roll for the addition of an at least partially liquid cooling medium and means for removing this cooling medium from the roll surface are arranged alternately, individually or in groups, with means for removing the cooling medium at the ends on both sides.
  • EP 0 899 030 A2 which shows the preambles of claims 1 and 3, relates to a device and a method for cooling the work rolls of a roll stand, comprising for each roll a cooling water channel equipped with spray nozzles on a spray bar and means for supplying cooling water or for removing heated water, as well as in association with the upper work roll, a cooling water guide plate arranged at an acute angle to the surface of the rolling stock a front scraper associated with the roll, and just below the level of the rolling stock an approximately horizontal cooling water guide plate with a scraper associated with the lower roll.
  • a cover plate is arranged in a sandwich-like arrangement above the upper cooling water guide plate, forming a liquid-carrying gap which is connected at its end remote from the roll to a cooling water suction device.
  • At least one suction pipe is arranged below the lower cooling water guide plate, protruding into the liquid-carrying corner area between this with the scraper and a surface area of the lower roller, and is connected to a cooling water suction device.
  • JP H02 133 107 A discloses a rolling mill having a device for cooling an upper work roll of the rolling mill.
  • the device has means for applying a cooling liquid to the upper work roll and means for sucking the cooling liquid applied to the upper work roll from the upper work roll.
  • JP H03 161 105 A discloses a roll stand with a device for cooling a work roll of the roll stand.
  • the device has an open chamber on the side of the work roll, into which a cooling liquid is sprayed directed at the work roll, and suction lines connected to the side of the chamber and connected to a vacuum pump.
  • JP S61 266 109 A discloses a rolling mill having a device for cooling an upper work roll of the rolling mill.
  • the device applies a cooling liquid to the barrel side of the upper work roll and has both a cooling liquid supply and a cooling liquid discharge.
  • a stripper of the roll stand is brought up to the barrel side of the upper work roll, with which the cooling liquid flowing off the upper work roll can be stripped off the upper work roll.
  • KR 2011 098 048 A discloses a rolling mill having a device for cooling an upper work roll of the rolling mill.
  • the upper work roll is by means of Cooling device can be acted upon with a cooling liquid on the bale side.
  • the roll stand also has a stripper that is brought up to the upper work roll on the barrel side, with which the cooling liquid flowing off the upper work roll can be caught on the stripper and stripped off the upper work roll, forming a coolant lake that is delimited on one side by the upper work roll.
  • the wiper has a drain opening through which the coolant can drain from the coolant lake from the wiper.
  • One object of the invention is to enable a more robust and cost-effective removal of cooling liquid from a cooling liquid pool present on a wiper.
  • a roll stand has at least one upper work roll, at least one cooling device for cooling the upper work roll, with which the upper work roll can be subjected to a cooling liquid on the barrel side, and at least one stripper which is guided towards the upper work roll on the barrel side and with which the Cooling liquid can be collected on the stripper and can be stripped off the upper working roll, forming a cooling liquid lake which is delimited on one side by the upper working roll.
  • the cooling device has at least one water jet pump which has a pressurized water inlet which is at least temporarily connected to a coolant supply is connected to the cooling device, and has an intake inlet which is at least temporarily immersed in the coolant lake.
  • the cooling liquid, for example cooling water, of the cooling liquid lake on the stripper can be sucked off by means of the water jet pump and thereby discharged, whereby the cooling liquid lake, which is unnecessary or disruptive per se, can possibly be almost completely reduced.
  • This targeted removal of the cooling liquid from the cooling liquid pool or its associated reduction means that a spray pattern of a device used for spraying the cooling liquid in the direction of the upper work roll, in particular a cooling beam, is not impaired by the cooling liquid pool.
  • the reduction in the coolant pool ensures that the heated coolant contained in the coolant pool does not impair the desired cooling of the upper work roll. Consequently, with the invention, the cooling efficiency of the upper work roll is additionally improved.
  • the cooling liquid does not (on both sides) flow off the side or on the end faces of the roll from the stripper, no drainage space, as described above, is required between the stripper and a boundary of the roll stand.
  • the maximum width, in particular the maximum strip width, of the rolled product is not restricted by the cooling device according to the invention.
  • the length of the scraper which is transverse to the running direction of the rolling stock through the roll stand, can fully utilize the installation space that is limited, for example, by the roll stand and/or the lateral cheeks of an outlet guide. A longer scraper can therefore be used than conventionally.
  • the cooling liquid according to the invention does not (on both sides) flow off the side or on the end face of the roll from the scraper, it cannot reach edges, in particular strip edges, of the rolled product, so that the invention also prevents a resulting deterioration in the quality of the rolled product and thus allows a larger bandwidth in a given space.
  • the suction of the cooling liquid from the cooling liquid lake according to the invention is also not critical compared to a possible suction of air.
  • no external power input is required to operate the water jet pump, since the water jet pump is operated using the pressurized water from the coolant supply that is available in any case.
  • no moving parts are required for pumping the cooling liquid out of the cooling liquid pool according to the invention, which reduces the maintenance effort.
  • the suction of the cooling liquid from the cooling liquid pool according to the invention is also insensitive to dirty cooling liquid or to particles in the sucked cooling liquid and can therefore be operated with very little maintenance, permanently and inexpensively.
  • the cooling liquid can be fed to the pressurized water inlet of the water jet pump, for example, at a pressure that is greater than 3 bar, preferably greater than 5 bar, and particularly preferably between 10 bar and 15 bar.
  • the pressure at the suction inlet of the water jet pump results from the ambient pressure and the pressure of the coolant lake, which is negligible and is approximately 0 bar.
  • a quantity of cooling liquid of between 100 m 3 /h and 900 m 3 /h can be applied to the upper work roll.
  • the amount of cooling liquid branched off for the operation of the water jet pump can be, for example, about 10% to about 20% of the total amount of cooling liquid supplied to an injection unit of the cooling device.
  • the cooling device can have at least one cooling bar arranged laterally next to the upper work roll with respect to a longitudinal center axis of the upper work roll, with which the cooling liquid can be sprayed in the direction of the upper work roll, whereby the upper work roll can be acted upon laterally by the cooling liquid.
  • the chilled beam can be arranged in a height-adjustable manner.
  • the water jet pump or its pressurized water inlet and/or suction inlet can be connected to the coolant supply of the cooling device either continuously or temporarily.
  • the water jet pump can be operated as required by temporarily connecting the water jet pump to the coolant supply via at least one switching valve or the like.
  • the water jet pump itself is a self-regulating system that basically requires no control and/or regulation and also does not require valve technology or the like.
  • the cooling device can also have two or more water jet pumps arranged distributed over the width of the upper work roll.
  • the scraper is held by a scraper holder and may be adjustably positioned relative to the upper work roll.
  • the scraper is arranged at an incline, with its end section facing the upper work roll being arranged geodetically lower than its end section facing away from the upper work roll.
  • a basin is formed between the upper work roll and the scraper, in which the coolant pool is formed.
  • the scraper can have lateral cheeks which delimit the basin on opposite sides and prevent the cooling liquid from flowing off the scraper on both sides.
  • the roll stand can in particular be a hot roll stand.
  • the roll stand can be used, for example, for rolling metallic, preferably ferrous or aluminum-containing rolling stock.
  • the roll stand may have additional rolls supporting the work rolls.
  • the water jet pump is at least partially arranged within a cooling beam of the cooling device, with which the upper work roll can be charged with the cooling liquid.
  • an outlet of the water jet pump or an outlet of a liquid line connected in a communicating manner to the outlet of the water jet pump is arranged geodetically lower than the cooling liquid lake.
  • the upper work roll is laterally charged with a cooling liquid and the cooling liquid flowing off the upper work roll by means of a stripper that is guided laterally to the upper work roll, forming a coolant lake on the stripper that is delimited on one side by the upper work roll and scraped off the upper work roll, the cooling liquid of the cooling liquid pool being pumped out using at least one water jet pump, and an intake inlet of the water jet pump being immersed in the cooling liquid lake and a pressurized water inlet of the water jet pump being at least temporarily connected to a cooling liquid supply.
  • the roll stand can be used according to one of the above-mentioned configurations or a combination of at least two of these configurations with one another to carry out the method.
  • figure 1 shows a schematic representation of an exemplary embodiment of a roll stand 1 according to the invention with an upper work roll 2, a lower work roll 3 and a roll gap 4 provided between the work rolls 2 and 3.
  • the direction of rotation of the work rolls 2 and 3 during a rolling process is indicated by arrows.
  • the roll stand 1 has other components that are not shown for the sake of clarity.
  • the roll stand 1 also has a cooling device 5 for cooling the upper work roll 2, with which the upper work roll 2 can be subjected to a cooling liquid 6 on the barrel side.
  • the cooling device 5 has a cooling beam 7 which is connected to a cooling liquid supply (not shown) of the cooling device 5 and on which several spray nozzles 8 are arranged, with which the cooling liquid 6 is sprayed in the direction of the upper work roll 2 .
  • the roll stand 1 has an inclined stripper 9, which is guided towards the upper work roll 2 on the barrel side, which is plate-shaped and with which the cooling liquid 6 flowing off the upper work roll 2 forms a cooling liquid lake 10 bounded on one side by the upper work roll 2 can be caught by the stripper 9 and can be stripped off the upper work roll 2 .
  • the roll stand 1 also has a horizontally arranged, plate-shaped stripper 11 which is guided towards the lower work roll 3 on the barrel side.
  • the cooling device 5 has a water jet pump 12 which has a pressurized water inlet 13 which is at least temporarily connected to the cooling liquid supply of the cooling device 5 and a suction inlet 14 which is immersed in the cooling liquid lake 10 .
  • the liquid flow through the operated water jet pump 12 is indicated by arrows.
  • the water jet pump 12 is partially arranged inside the chilled beam 7 .
  • An outlet of the water jet pump 12 (not shown) can be arranged geodetically lower than the coolant pool 10 .
  • an outlet 15 of a liquid line 16 indicated by a dashed line and connected in communication with the outlet of the water jet pump 12 can be arranged geodetically lower than the cooling liquid lake 10 .

Description

Die Erfindung betrifft ein Walzgerüst mit wenigstens einer oberen Arbeitswalze, wenigstens einer Kühlvorrichtung zum Kühlen der oberen Arbeitswalze, mit der die obere Arbeitswalze ballenseitig mit einer Kühlflüssigkeit beaufschlagbar ist, und wenigstens einem ballenseitig an die obere Arbeitswalze herangeführten Abstreifer, mit dem die von der oberen Arbeitswalze abfließende Kühlflüssigkeit unter Bildung eines einseitig durch die obere Arbeitswalze begrenzten Kühlflüssigkeitssees auf dem Abstreifer auffangbar und von der oberen Arbeitswalze abstreifbar ist.The invention relates to a roll stand with at least one upper work roll, at least one cooling device for cooling the upper work roll, with which the upper work roll can be subjected to a cooling liquid on the barrel side, and at least one stripper which is guided towards the upper work roll on the barrel side and with which the from the upper work roll outflowing cooling liquid can be collected on the scraper and stripped off the upper working roll, forming a cooling liquid lake which is delimited on one side by the upper working roll.

Des Weiteren betrifft die Erfindung ein Verfahren zum Kühlen der oberen Arbeitswalze eines Walzgerüsts, wobei die obere Arbeitswalze ballenseitig mit einer Kühlflüssigkeit beaufschlagt wird und die von der oberen Arbeitswalze abfließende Kühlflüssigkeit mittels eines ballenseitig an die obere Arbeitswalze herangeführten Abstreifers unter Bildung eines einseitig durch die obere Arbeitswalze begrenzten Kühlflüssigkeitssees auf dem Abstreifer aufgefangen und von der oberen Arbeitswalze abgestreift wird.Furthermore, the invention relates to a method for cooling the upper work roll of a roll stand, wherein the upper work roll is acted upon by a cooling liquid on the barrel side and the cooling liquid flowing out of the upper work roll by means of a scraper that is guided towards the upper work roll on the barrel side, forming a stripper on one side through the upper work roll limited lake of cooling liquid is collected on the scraper and scraped off by the upper work roll.

Ein Walzgerüst zum Walzen bevorzugt zum Walzen von warmem Walzgut weist eine obere Arbeitswalze, eine untere Arbeitswalze und einen dazwischen gegebenen Walzspalt auf. Üblicherweise werden die Arbeitswalzen während eines Walzvorgangs mit einer Kühlflüssigkeit gekühlt. Um zu verhindern, dass die von der oberen Arbeitswalze abfließende Kühlflüssigkeit auf das durch den Walzspalt geführte Walzgut gelangt, wird herkömmlich ein seitlich an die obere Arbeitswalze herangeführten Abstreifer verwendet, mit dem die von der oberen Arbeitswalze abfließende Kühlflüssigkeit unter Bildung eines einseitig durch die obere Arbeitswalze begrenzten Kühlflüssigkeitssees auf dem Abstreifer aufgefangen und von der oberen Arbeitswalze abgestreift wird, so dass das darunter geführte Walzgut nicht benetzt wird.A roll stand for rolling, preferably for rolling hot rolling stock, has an upper work roll, a lower work roll and a roll gap therebetween. Usually, the work rolls are cooled with a cooling liquid during a rolling process. In order to prevent the cooling liquid flowing off the upper work roll from getting onto the rolling stock guided through the roll gap, a scraper is conventionally used which is guided laterally to the upper work roll and with which the cooling liquid flowing off the upper work roll forms a one-sided through the upper work roll limited lake of cooling liquid is collected on the scraper and scraped off by the upper work roll so that the rolling stock guided underneath is not wetted.

Es ist beispielsweise aus JP H06 339 712 A und aus DE 10 2016 223 131 A1 bekannt, die auf dem Abstreifer befindliche Kühlflüssigkeit bezüglich einer Walzgutdurchlaufrichtung durch das Walzgerüst beidseitig seitlich von dem Abstreifer abfließen zu lassen, um ein Überlaufen des Kühlflüssigkeitssees zu verhindern. Dies hat jedoch den Nachteil, dass für diese Kühlflüssigkeitsabführung aus dem Kühlflüssigkeitssee üblicherweise beidseitig zu dem Abstreifer jeweils ein Abfließraum zwischen dem Abstreifer und einer seitlichen Begrenzung des Walzgerüsts, beispielsweise entlang eines Walzenständers des Walzgerüsts oder einer Wange einer Auslaufführung des Walzgerüsts, benötigt wird. Diese Abfließräume wirken bei bestehendem bzw. fest vorgegebenem Walzenständerabstand beschränkend für die maximale Breite, insbesondere die maximale Bandbreite, des herzustellenden Walzprodukts. Ein Grund hierfür ist, dass die Qualität, insbesondere die Bandqualität, des Walzprodukts in erheblichem Maße negativ beeinflusst wird, wenn die von dem Abstreifer seitlich abfließende Kühlflüssigkeit auf den seitlichen Rand, insbesondere eine Bandkante, des Walzprodukts trifft.For example, it's over JP H06 339 712 A and from DE 10 2016 223 131 A1 known, the coolant located on the scraper with respect to a Let the rolling stock flow direction through the roll stand on both sides drain off the scraper to prevent the coolant lake from overflowing. However, this has the disadvantage that this cooling liquid discharge from the cooling liquid pool usually requires a drainage space on both sides of the stripper between the stripper and a lateral boundary of the roll stand, for example along a roll stand of the roll stand or a cheek of an outlet guide of the roll stand. With an existing or fixed roll stand spacing, these drainage spaces have a limiting effect on the maximum width, in particular the maximum strip width, of the rolled product to be produced. One reason for this is that the quality, in particular the strip quality, of the rolled product is negatively influenced to a considerable extent when the cooling liquid flowing off the side of the scraper hits the lateral edge, in particular a strip edge, of the rolled product.

EP 0 313 516 A1 betrifft ein Walzgerüst mit einer Vorrichtung zum Kühlen von Walzen, insbesondere beim kontinuierlichen Bandgießen und beim Walzen von Metallen, wobei die Walzen mit je einer sich vom Bereich des Walzspalts über einen Teil der Walzenoberfläche erstreckenden, gegen die Walze abgedichtete Haube bedeckt sind, in welcher Mittel zum Zuführen eines Kühlmediums auf Teile der Walzenoberfläche und zu dessen Entfernung sowie eine Abfluss- bzw. Absaugvorrichtung für sich im unteren Teil der Haube sammelndes, flüssiges Kühlmedium vorgesehen sind. In einer Haube sind mehrere sich in axialer Richtung über die ganze Walzenlänge erstreckende Sprüheinrichtungen für die Zugabe eines mindestens teilweise flüssigen Kühlmediums und Mittel zum Entfernen dieses Kühlmediums von der Walzenoberfläche einzeln oder in Gruppen alternierend angeordnet, mit beidseits endständigen Mitteln zum Entfernen des Kühlmediums. EP 0 313 516 A1 relates to a roll stand with a device for cooling rolls, in particular in continuous strip casting and in the rolling of metals, wherein the rolls are each covered with a hood that extends from the area of the roll gap over a part of the roll surface and is sealed against the roll, in which means for supplying a cooling medium to parts of the roll surface and for its removal, as well as a drain or suction device for liquid cooling medium collecting in the lower part of the hood. In a hood, several spray devices extending in the axial direction over the entire length of the roll for the addition of an at least partially liquid cooling medium and means for removing this cooling medium from the roll surface are arranged alternately, individually or in groups, with means for removing the cooling medium at the ends on both sides.

EP 0 899 030 A2 , welche die Oberbegriffe der Ansprüche 1 und 3 zeigt, betrifft eine Vorrichtung und ein Verfahren zur Kühlung der Arbeitswalzen eines Walzgerüstes, umfassend für jede Walze einen mit Spritzdüsen bestückten Kühlwasserkanal an einem Spritzbalken sowie Mittel zur Zufuhr von Kühlwasser bzw. zum Abführen erhitzten Wassers, sowie in Zuordnung zur oberen Arbeitswalze eine im spitzen Winkel zur Walzgutoberfläche angeordnete Kühlwasser-Leitplatte mit einem vorderseitigen, der Walze zugeordneten Abstreifer, und dicht unterhalb der Walzgutebene eine annähernd horizontale Kühlwasser-Leitplatte mit einem der unteren Walze zugeordneten Abstreifer. In sandwichartiger Zuordnung oberhalb der oberen Kühlwasser-Leitplatte ist eine Deckplatte unter Ausbildung eines flüssigkeitsführenden Spalts angeordnet, der an seinem der Walze abgewandten Ende mit einer Kühlwasser-Absaugung in Verbindung steht. Unterhalb der unteren Kühlwasser-Leitplatte, in den sich zwischen dieser mit dem Abstreifer und einem Oberflächenbereich der unteren Walze ergebenden flüssigkeitsführenden Eckbereich hineinragend, ist wenigstens ein Absaugrohr angeordnet und an eine Kühlwasser-Absaugung angeschlossen. EP 0 899 030 A2 , which shows the preambles of claims 1 and 3, relates to a device and a method for cooling the work rolls of a roll stand, comprising for each roll a cooling water channel equipped with spray nozzles on a spray bar and means for supplying cooling water or for removing heated water, as well as in association with the upper work roll, a cooling water guide plate arranged at an acute angle to the surface of the rolling stock a front scraper associated with the roll, and just below the level of the rolling stock an approximately horizontal cooling water guide plate with a scraper associated with the lower roll. A cover plate is arranged in a sandwich-like arrangement above the upper cooling water guide plate, forming a liquid-carrying gap which is connected at its end remote from the roll to a cooling water suction device. At least one suction pipe is arranged below the lower cooling water guide plate, protruding into the liquid-carrying corner area between this with the scraper and a surface area of the lower roller, and is connected to a cooling water suction device.

JP H02 133 107 A offenbart ein Walzgerüst mit einer Vorrichtung zum Kühlen einer oberen Arbeitswalze des Walzgerüsts. Die Vorrichtung weist Mittel zum Aufbringen einer Kühlflüssigkeit auf die obere Arbeitswalze und Mittel zum Absaugen der auf die obere Arbeitswalzte aufgebrachten Kühlflüssigkeit von der oberen Arbeitswalze auf. JP H02 133 107 A discloses a rolling mill having a device for cooling an upper work roll of the rolling mill. The device has means for applying a cooling liquid to the upper work roll and means for sucking the cooling liquid applied to the upper work roll from the upper work roll.

JP H03 161 105 A offenbart ein Walzgerüst mit einer Vorrichtung zum Kühlen einer Arbeitswalze des Walzgerüsts. Die Vorrichtung weist eine auf der Seite der Arbeitswalze offene Kammer, in die eine Kühlflüssigkeit auf die Arbeitswalze gerichtet eingesprüht wird, und seitlich an die Kammer angeschlossene Absaugleitungen auf, die mit einer Vakuumpumpe verbunden sind. JP H03 161 105 A discloses a roll stand with a device for cooling a work roll of the roll stand. The device has an open chamber on the side of the work roll, into which a cooling liquid is sprayed directed at the work roll, and suction lines connected to the side of the chamber and connected to a vacuum pump.

JP S61 266 109 A offenbart ein Walzgerüst mit einer Vorrichtung zum Kühlen einer oberen Arbeitswalze des Walzgerüsts. Die Vorrichtung beaufschlagt die obere Arbeitswalze ballenseitig mit einer Kühlflüssigkeit und weist sowohl eine Kühlflüssigkeitszuführung als auch eine Kühlflüssigkeitsabführung auf. An die obere Arbeitswalze ist ballenseitig ein Abstreifer des Walzgerüsts herangeführt, mit dem die von der oberen Arbeitswalze abfließende Kühlflüssigkeit von der oberen Arbeitswalze abstreifbar ist. JP S61 266 109 A discloses a rolling mill having a device for cooling an upper work roll of the rolling mill. The device applies a cooling liquid to the barrel side of the upper work roll and has both a cooling liquid supply and a cooling liquid discharge. A stripper of the roll stand is brought up to the barrel side of the upper work roll, with which the cooling liquid flowing off the upper work roll can be stripped off the upper work roll.

KR 2011 098 048 A offenbart ein Walzgerüst mit einer Vorrichtung zum Kühlen einer oberen Arbeitswalze des Walzgerüsts. Die obere Arbeitswalze ist mittels der Kühlvorrichtung ballenseitig mit einer Kühlflüssigkeit beaufschlagbar. Das Walzgerüst weist zudem einen ballenseitig an die obere Arbeitswalze herangeführten Abstreifer auf, mit dem die von der oberen Arbeitswalze abfließende Kühlflüssigkeit unter Bildung eines einseitig durch die obere Arbeitswalze begrenzten Kühlflüssigkeitssees auf dem Abstreifer auffangbar und von der oberen Arbeitswalze abstreifbar ist. An dem Abstreifer ist eine Ablauföffnung auf, über die die Kühlflüssigkeit aus dem Kühlflüssigkeitssee von dem Abstreifer ablaufen kann. KR 2011 098 048 A discloses a rolling mill having a device for cooling an upper work roll of the rolling mill. The upper work roll is by means of Cooling device can be acted upon with a cooling liquid on the bale side. The roll stand also has a stripper that is brought up to the upper work roll on the barrel side, with which the cooling liquid flowing off the upper work roll can be caught on the stripper and stripped off the upper work roll, forming a coolant lake that is delimited on one side by the upper work roll. The wiper has a drain opening through which the coolant can drain from the coolant lake from the wiper.

Eine Aufgabe der Erfindung ist es, eine robuster und kostengünstiger realisierbare Abführung von Kühlflüssigkeit aus einem auf einem Abstreifer vorhandenen Kühlflüssigkeitssee zu ermöglichen.One object of the invention is to enable a more robust and cost-effective removal of cooling liquid from a cooling liquid pool present on a wiper.

Diese Aufgabe wird durch die unabhängigen Patentansprüche gelöst. Vorteilhafte Ausgestaltungen sind in der nachfolgenden Beschreibung, den abhängigen Patentansprüchen und der Figur wiedergegeben, wobei diese Ausgestaltungen jeweils für sich genommen oder in Kombination von wenigstens zwei dieser Ausgestaltungen miteinander einen weiterbildenden, insbesondere auch bevorzugten oder vorteilhaften, Aspekt der Erfindung darstellen können. Ausgestaltungen des Walzgerüsts können dabei Ausgestaltungen des Verfahrens entsprechen, und umgekehrt, selbst wenn im Folgenden hierauf im Einzelfall nicht explizit hingewiesen wird.This object is solved by the independent patent claims. Advantageous configurations are given in the following description, the dependent patent claims and the figure, whereby these configurations, taken individually or in combination of at least two of these configurations with one another, can represent a further developing, in particular also preferred or advantageous, aspect of the invention. Configurations of the roll stand can correspond to configurations of the method and vice versa, even if this is not explicitly referred to in the following in individual cases.

Ein erfindungsgemäßes Walzgerüst weist wenigstens eine obere Arbeitswalze, wenigstens eine Kühlvorrichtung zum Kühlen der oberen Arbeitswalze, mit der die obere Arbeitswalze ballenseitig mit einer Kühlflüssigkeit beaufschlagbar ist, und wenigstens einen ballenseitig an die obere Arbeitswalze herangeführten Abstreifer auf, mit dem die von der oberen Arbeitswalze abfließende Kühlflüssigkeit unter Bildung eines einseitig durch die obere Arbeitswalze begrenzten Kühlflüssigkeitssees auf dem Abstreifer auffangbar und von der oberen Arbeitswalze abstreifbar ist. Die Kühlvorrichtung weist wenigstens eine Wasserstrahlpumpe auf, die einen Druckwassereingang, der zumindest zeitweilig mit einer Kühlflüssigkeitsversorgung der Kühlvorrichtung verbunden ist, und einen zumindest zeitweise in den Kühlflüssigkeitssee eintauchenden Ansaugeingang aufweist.A roll stand according to the invention has at least one upper work roll, at least one cooling device for cooling the upper work roll, with which the upper work roll can be subjected to a cooling liquid on the barrel side, and at least one stripper which is guided towards the upper work roll on the barrel side and with which the Cooling liquid can be collected on the stripper and can be stripped off the upper working roll, forming a cooling liquid lake which is delimited on one side by the upper working roll. The cooling device has at least one water jet pump which has a pressurized water inlet which is at least temporarily connected to a coolant supply is connected to the cooling device, and has an intake inlet which is at least temporarily immersed in the coolant lake.

Erfindungsgemäß kann die Kühlflüssigkeit, beispielsweise ein Kühlwasser, des Kühlflüssigkeitssees auf dem Abstreifer mittels der Wasserstrahlpumpe abgesaugt und hierdurch abgeführt werden, wodurch der an sich unnötige oder störende Kühlflüssigkeitssee eventuell nahezu vollständig reduziert werden kann. Durch diese gezielte Abführung der Kühlflüssigkeit aus dem Kühlflüssigkeitssee bzw. dessen damit einhergehende Reduzierung wird eine Beeinträchtigung eines Spritzbildes einer zum Spritzen der Kühlflüssigkeit in Richtung der oberen Arbeitswalze verwendeten Einrichtung, insbesondere eines Kühlbalkens, nicht durch den Kühlflüssigkeitssee beeinträchtigt. Zudem wird mit der Reduzierung des Kühlflüssigkeitssees erreicht, dass die in dem Kühlmittelsee enthaltene aufgeheizte Kühlflüssigkeit die gewünschte Kühlung der oberen Arbeitswalze nicht beeinträchtigt. Folglich wird mit der Erfindung zusätzlich die Wirksamkeit der Kühlung der oberen Arbeitswalze verbessert.According to the invention, the cooling liquid, for example cooling water, of the cooling liquid lake on the stripper can be sucked off by means of the water jet pump and thereby discharged, whereby the cooling liquid lake, which is unnecessary or disruptive per se, can possibly be almost completely reduced. This targeted removal of the cooling liquid from the cooling liquid pool or its associated reduction means that a spray pattern of a device used for spraying the cooling liquid in the direction of the upper work roll, in particular a cooling beam, is not impaired by the cooling liquid pool. In addition, the reduction in the coolant pool ensures that the heated coolant contained in the coolant pool does not impair the desired cooling of the upper work roll. Consequently, with the invention, the cooling efficiency of the upper work roll is additionally improved.

Da zudem die Kühlflüssigkeit nicht (beidseitig) seitlich bzw. an den Stirnseiten der Walze von dem Abstreifer abfließt, wird kein eingangs beschriebener Abfließraum zwischen dem Abstreifer und einer Begrenzung des Walzgerüsts benötigt. Hierdurch wird die maximale Breite, insbesondere die maximale Bandbreite, des Walzproduktes nicht durch die erfindungsgemäße Kühlvorrichtung eingeschränkt. Dabei kann die quer zu der Laufrichtung des Walzguts durch das Walzgerüst gegebene Länge des Abstreifers, den Bauraum, der beispielsweise durch die Walzenständer und/oder die seitlichen Wangen einer Auslaufführung begrenzt ist, vollständig ausnutzen. Es kann also ein längerer Abstreifer als herkömmlich eingesetzt werden. Da die Kühlflüssigkeit gemäß der Erfindung nicht (beidseitig) seitlich bzw. an der Stirnseite der Walze von dem Abstreifer abfließt, kann sie nicht auf Ränder, insbesondere Bandkanten, des Walzprodukts gelangen, so dass die Erfindung auch eine dadurch bedingte Verschlechterung der Qualität des Walzprodukts verhindert und somit in einem gegebenen Bauraum eine größere Bandbreite gestattet. Ein Vorteil, der insbesondere bei der Modernisierung älterer Gerüste wirkt.In addition, since the cooling liquid does not (on both sides) flow off the side or on the end faces of the roll from the stripper, no drainage space, as described above, is required between the stripper and a boundary of the roll stand. As a result, the maximum width, in particular the maximum strip width, of the rolled product is not restricted by the cooling device according to the invention. The length of the scraper, which is transverse to the running direction of the rolling stock through the roll stand, can fully utilize the installation space that is limited, for example, by the roll stand and/or the lateral cheeks of an outlet guide. A longer scraper can therefore be used than conventionally. Since the cooling liquid according to the invention does not (on both sides) flow off the side or on the end face of the roll from the scraper, it cannot reach edges, in particular strip edges, of the rolled product, so that the invention also prevents a resulting deterioration in the quality of the rolled product and thus allows a larger bandwidth in a given space. An advantage that is particularly effective when modernizing older scaffolding.

Das erfindungsgemäße Absaugen der Kühlflüssigkeit aus dem Kühlflüssigkeitssee ist zudem unkritisch gegenüber einem eventuellen Ansaugen von Luft. Zudem ist zum Betrieb der Wasserstrahlpumpe kein externer Leistungseintrag erforderlich, da die Wasserstrahlpumpe mittels des ohnehin zur Verfügung stehenden Druckwassers der Kühlflüssigkeitsversorgung betrieben wird. Des Weiteren sind zum erfindungsgemäßen Abpumpen der Kühlflüssigkeit aus dem Kühlflüssigkeitssee keine beweglichen Teile erforderlich, was den Wartungsaufwand reduziert. Die erfindungsgemäße Absaugung der Kühlflüssigkeit aus dem Kühlflüssigkeitssee ist zudem unempfindlich gegenüber verschmutzter Kühlflüssigkeit bzw. gegenüber Partikeln in der angesaugten Kühlflüssigkeit und somit sehr wartungsarm, dauerhaft und kostengünstig betreibbar.The suction of the cooling liquid from the cooling liquid lake according to the invention is also not critical compared to a possible suction of air. In addition, no external power input is required to operate the water jet pump, since the water jet pump is operated using the pressurized water from the coolant supply that is available in any case. Furthermore, no moving parts are required for pumping the cooling liquid out of the cooling liquid pool according to the invention, which reduces the maintenance effort. The suction of the cooling liquid from the cooling liquid pool according to the invention is also insensitive to dirty cooling liquid or to particles in the sucked cooling liquid and can therefore be operated with very little maintenance, permanently and inexpensively.

Die Kühlflüssigkeit kann dem Druckwassereingang der Wasserstrahlpumpe beispielsweise mit einem Druck zugeführt werden, der größer als 3 bar, vorzugsweise größer als 5 bar, ist und besonders bevorzugt zwischen 10 bar bis 15 bar liegt. Der Druck an dem Ansaugeingang der Wasserstrahlpumpe ergibt sich aus dem Umgebungsdruck und dem Druck des Kühlflüssigkeitssees, der vernachlässigbar ist und etwa 0 bar beträgt. Mit der Kühlvorrichtung kann beispielsweise eine Kühlflüssigkeitsmenge zwischen 100 m3/h bis 900 m3/h auf die obere Arbeitswalze aufgebracht werden. Die für den Betrieb der Wasserstrahlpumpe abgezweigte Kühlflüssigkeitsmenge kann beispielsweise etwa 10% bis etwa 20% der einer Spritzeinheit der Kühlvorrichtung insgesamt zugeführten Kühlflüssigkeitsmenge betragen.The cooling liquid can be fed to the pressurized water inlet of the water jet pump, for example, at a pressure that is greater than 3 bar, preferably greater than 5 bar, and particularly preferably between 10 bar and 15 bar. The pressure at the suction inlet of the water jet pump results from the ambient pressure and the pressure of the coolant lake, which is negligible and is approximately 0 bar. With the cooling device, for example, a quantity of cooling liquid of between 100 m 3 /h and 900 m 3 /h can be applied to the upper work roll. The amount of cooling liquid branched off for the operation of the water jet pump can be, for example, about 10% to about 20% of the total amount of cooling liquid supplied to an injection unit of the cooling device.

Die Kühlvorrichtung kann wenigstens einen bezüglich einer Längsmittelachse der oberen Arbeitswalze seitlich neben der oberen Arbeitswalzte angeordneten Kühlbalken aufweisen, mit dem die Kühlflüssigkeit in Richtung der oberen Arbeitswalze spritzbar ist, wodurch die obere Arbeitswalze seitlich mit der Kühlflüssigkeit beaufschlagbar ist. Der Kühlbalken kann höhenverstellbar angeordnet sein.The cooling device can have at least one cooling bar arranged laterally next to the upper work roll with respect to a longitudinal center axis of the upper work roll, with which the cooling liquid can be sprayed in the direction of the upper work roll, whereby the upper work roll can be acted upon laterally by the cooling liquid. The chilled beam can be arranged in a height-adjustable manner.

Die Wasserstrahlpumpe bzw. deren Druckwassereingang und/oder Ansaugeingang kann zeitlich ununterbrochen oder zeitweilig mit der Kühlflüssigkeitsversorgung der Kühlvorrichtung verbunden sein. Bei der zweiten Alternative kann die Wasserstrahlpumpe bei Bedarf betrieben werden, indem die Wasserstrahlpumpe über wenigstens ein Schaltventil oder dergleichen zeitweilig mit der Kühlflüssigkeitsversorgung verbunden wird. Bei der Wasserstrahlpumpe selbst handelt es sich jedoch um ein selbstregelndes System, das grundsätzlich keine Steuerung und/oder Regelung benötigt und zudem ohne Ventiltechnik und dergleichen auskommt. Die Kühlvorrichtung kann auch zwei oder mehrere über die Breite der oberen Arbeitswalze verteilt angeordnete Wasserstrahlpumpen aufweisen.The water jet pump or its pressurized water inlet and/or suction inlet can be connected to the coolant supply of the cooling device either continuously or temporarily. In the second alternative, the water jet pump can be operated as required by temporarily connecting the water jet pump to the coolant supply via at least one switching valve or the like. However, the water jet pump itself is a self-regulating system that basically requires no control and/or regulation and also does not require valve technology or the like. The cooling device can also have two or more water jet pumps arranged distributed over the width of the upper work roll.

Der Abstreifer wird mittels eines Abstreiferhalters gehalten und kann relativ zu der oberen Arbeitswalze verstellbar angeordnet sein. Der Abstreifer ist geneigt angeordnet, wobei sein der oberen Arbeitswalze zugewandter Endabschnitt geodätisch tiefer als sein der oberen Arbeitswalze abgewandter Endabschnitt angeordnet ist. Hierdurch wird zwischen der oberen Arbeitswalze und dem Abstreifer ein Becken ausgebildet, in dem sich der Kühlmittelsee bildet. Der Abstreifer kann hierbei seitliche Wangen aufweisen, die das Becken auf einander gegenüberliegenden Seiten begrenzen und verhindern, dass die Kühlflüssigkeit beidseitig seitlich von dem Abstreifer abfließt.The scraper is held by a scraper holder and may be adjustably positioned relative to the upper work roll. The scraper is arranged at an incline, with its end section facing the upper work roll being arranged geodetically lower than its end section facing away from the upper work roll. As a result, a basin is formed between the upper work roll and the scraper, in which the coolant pool is formed. In this case, the scraper can have lateral cheeks which delimit the basin on opposite sides and prevent the cooling liquid from flowing off the scraper on both sides.

Das Walzgerüst kann insbesondere ein Warmwalzgerüst sein. Das Walzgerüst kann beispielsweise zum Walzen von metallischem, bevorzugt eisenhaltigem oder aluminiumhaltigem Walzgut verwendet werden. Das Walzgerüst kann die Arbeitswalzen abstützende zusätzliche Walzen aufweisen.The roll stand can in particular be a hot roll stand. The roll stand can be used, for example, for rolling metallic, preferably ferrous or aluminum-containing rolling stock. The roll stand may have additional rolls supporting the work rolls.

Gemäß einer vorteilhaften Ausgestaltung ist die Wasserstrahlpumpe zumindest teilweise innerhalb eines Kühlbalkens der Kühlvorrichtung angeordnet, mit dem die obere Arbeitswalze mit der Kühlflüssigkeit beaufschlagbar ist. Hierdurch wird möglichst wenig Bauraum für die Anordnung der Wasserstrahlpumpe beansprucht, so dass die Wasserstrahlpumpe bauraumsparend angeordnet ist.According to an advantageous embodiment, the water jet pump is at least partially arranged within a cooling beam of the cooling device, with which the upper work roll can be charged with the cooling liquid. As a result, as little installation space as possible is required for the arrangement of the water jet pump, so that the water jet pump is arranged in a space-saving manner.

Gemäß einer weiteren vorteilhaften Ausgestaltung ist ein Ausgang der Wasserstrahlpumpe oder ein Ausgang einer kommunizierend mit dem Ausgang der Wasserstrahlpumpe verbundenen Flüssigkeitsleitung geodätisch tiefer als der Kühlflüssigkeitssees angeordnet. Hierdurch kann nach einem anfänglichen Betrieb der Wasserstrahlpumpe mittels der unter Druck stehenden Kühlflüssigkeit die Kühlflüssigkeitsversorgung der Wasserstrahlpumpe beendet werden, da unter Ausnutzung des hydrostatischen Drucks anschließend die Kühlflüssigkeit unter Verwendung des sogenannten Hebeeffekts bzw. unter Ausbildung eines Saughebers aus dem Kühlflüssigkeitssee abgesaugt wird, also ohne dass hierzu externe Energie zugeführt werden muss. Dadurch wird die Wirkung der Wasserstrahlpumpe erhöht. Hierbei kann die Wasserstrahlpumpe mittels wenigstens eines elektrisch ansteuerbaren Schaltventils zunächst mit der Kühlflüssigkeitsversorgung verbunden und nach dem anfänglichen Ansaugen von der Kühlflüssigkeitsversorgung getrennt werden. Die Flüssigkeitsleitung kann als starres Rohr oder als flexibler Schlauch ausgebildet sein.According to a further advantageous embodiment, an outlet of the water jet pump or an outlet of a liquid line connected in a communicating manner to the outlet of the water jet pump is arranged geodetically lower than the cooling liquid lake. As a result, after an initial operation of the water jet pump using the pressurized cooling liquid, the cooling liquid supply to the water jet pump can be terminated, since the cooling liquid is then sucked out of the cooling liquid pool using the so-called lifting effect or by forming a siphon, using the hydrostatic pressure, i.e. without external energy must be supplied for this purpose. This increases the effectiveness of the water jet pump. In this case, the water jet pump can first be connected to the cooling liquid supply by means of at least one electrically controllable switching valve and then separated from the cooling liquid supply after the initial intake. The liquid line can be designed as a rigid pipe or as a flexible hose.

Gemäß einem erfindungsgemäßen Verfahren zum Kühlen der oberen Arbeitswalze eines Walzgerüsts wird die obere Arbeitswalze seitlich mit einer Kühlflüssigkeit beaufschlagt und die von der oberen Arbeitswalze abfließende Kühlflüssigkeit mittels eines seitlich an die obere Arbeitswalze herangeführten Abstreifers unter Bildung eines einseitig durch die obere Arbeitswalze begrenzten Kühlflüssigkeitssees auf dem Abstreifer aufgefangen und von der oberen Arbeitswalze abgestreift, wobei die Kühlflüssigkeit des Kühlflüssigkeitssees unter Verwendung von wenigstens einer Wasserstrahlpumpe abgepumpt wird, und wobei ein Ansaugeingang der Wasserstrahlpumpe in den Kühlflüssigkeitssee eingetaucht wird und ein Druckwassereingang der Wasserstrahlpumpe zumindest zeitweilig mit einer Kühlflüssigkeitsversorgung verbunden wird.According to a method according to the invention for cooling the upper work roll of a roll stand, the upper work roll is laterally charged with a cooling liquid and the cooling liquid flowing off the upper work roll by means of a stripper that is guided laterally to the upper work roll, forming a coolant lake on the stripper that is delimited on one side by the upper work roll and scraped off the upper work roll, the cooling liquid of the cooling liquid pool being pumped out using at least one water jet pump, and an intake inlet of the water jet pump being immersed in the cooling liquid lake and a pressurized water inlet of the water jet pump being at least temporarily connected to a cooling liquid supply.

Mit dem Verfahren sind die oben mit Bezug auf das Walzgerüst genannten Vorteile entsprechend verbunden. Insbesondere kann das Walzgerüst gemäß einer der oben genannten Ausgestaltungen oder einer Kombination von wenigstens zwei dieser Ausgestaltungen miteinander zur Durchführung des Verfahrens verwendet werden.The advantages mentioned above in relation to the roll stand are correspondingly associated with the method. In particular, the roll stand can be used according to one of the above-mentioned configurations or a combination of at least two of these configurations with one another to carry out the method.

Im Folgenden wird die Erfindung unter Bezugnahme auf die anliegende Figur anhand einer bevorzugten Ausführungsform beispielhaft erläutert, wobei die nachfolgend erläuterten Merkmale sowohl jeweils für sich genommen als auch in Kombination von wenigstens zwei dieser Merkmale miteinander einen vorteilhaften oder weiterbildenden Aspekt der Erfindung darstellen können. Es zeigt:

Figur 1:
eine schematische Darstellung eines Ausführungsbeispiels für ein erfindungsgemäßes Walzgerüst.
In the following, the invention is explained by way of example with reference to the accompanying figure using a preferred embodiment, with the features explained below being able to represent an advantageous or further developing aspect of the invention both individually and in combination with at least two of these features. It shows:
Figure 1:
a schematic representation of an embodiment of a roll stand according to the invention.

Figur 1 zeigt eine schematische Darstellung eines Ausführungsbeispiels für ein erfindungsgemäßes Walzgerüst 1 mit einer oberen Arbeitswalze 2, einer unteren Arbeitswalze 3 und einem zwischen den Arbeitswalzen 2 und 3 gegebenen Walzspalt 4. Die Drehrichtung der Arbeitswalzen 2 und 3 während eines Walzvorgangs ist durch Pfeile angedeutet. Das Walzgerüst 1 weist selbstverständlich weitere Bauteile auf, die der Übersichtlichkeit halber nicht gezeigt sind. figure 1 shows a schematic representation of an exemplary embodiment of a roll stand 1 according to the invention with an upper work roll 2, a lower work roll 3 and a roll gap 4 provided between the work rolls 2 and 3. The direction of rotation of the work rolls 2 and 3 during a rolling process is indicated by arrows. Of course, the roll stand 1 has other components that are not shown for the sake of clarity.

Das Walzgerüst 1 weist zudem eine Kühlvorrichtung 5 zum Kühlen der oberen Arbeitswalze 2 auf, mit der die obere Arbeitswalze 2 ballenseitig mit einer Kühlflüssigkeit 6 beaufschlagbar ist. Hierzu weist die Kühlvorrichtung 5 einen Kühlbalken 7 auf, der mit einer nicht gezeigten Kühlflüssigkeitsversorgung der Kühlvorrichtung 5 verbunden ist und an dem mehrere Spritzdüsen 8 angeordnet sind, mit denen die Kühlflüssigkeit 6 in Richtung der oberen Arbeitswalze 2 gespritzt wird.The roll stand 1 also has a cooling device 5 for cooling the upper work roll 2, with which the upper work roll 2 can be subjected to a cooling liquid 6 on the barrel side. For this purpose, the cooling device 5 has a cooling beam 7 which is connected to a cooling liquid supply (not shown) of the cooling device 5 and on which several spray nozzles 8 are arranged, with which the cooling liquid 6 is sprayed in the direction of the upper work roll 2 .

Des Weiteren weist das Walzgerüst 1 einen ballenseitig an die obere Arbeitswalze 2 herangeführten, geneigt angeordneten Abstreifer 9 auf, der plattenförmig ausgebildet ist und mit dem die von der oberen Arbeitswalze 2 abfließende Kühlflüssigkeit 6 unter Bildung eines einseitig durch die obere Arbeitswalze 2 begrenzten Kühlflüssigkeitssees 10 auf dem Abstreifer 9 auffangbar und von der oberen Arbeitswalze 2 abstreifbar ist. Das Walzgerüst 1 weist auch einen ballenseitig an die untere Arbeitswalze 3 herangeführten, waagerecht angeordneten, plattenförmig ausgebildeten Abstreifer 11 auf.Furthermore, the roll stand 1 has an inclined stripper 9, which is guided towards the upper work roll 2 on the barrel side, which is plate-shaped and with which the cooling liquid 6 flowing off the upper work roll 2 forms a cooling liquid lake 10 bounded on one side by the upper work roll 2 can be caught by the stripper 9 and can be stripped off the upper work roll 2 . The roll stand 1 also has a horizontally arranged, plate-shaped stripper 11 which is guided towards the lower work roll 3 on the barrel side.

Die Kühlvorrichtung 5 weist eine Wasserstrahlpumpe 12 auf, die einen Druckwassereingang 13, der zumindest zeitweilig mit der Kühlflüssigkeitsversorgung der Kühlvorrichtung 5 verbunden ist, und einen in den Kühlflüssigkeitssee 10 eintauchenden Ansaugeingang 14 auf. Die Flüssigkeitsströmung durch die betriebene Wasserstrahlpumpe 12 ist durch Pfeile angedeutet.The cooling device 5 has a water jet pump 12 which has a pressurized water inlet 13 which is at least temporarily connected to the cooling liquid supply of the cooling device 5 and a suction inlet 14 which is immersed in the cooling liquid lake 10 . The liquid flow through the operated water jet pump 12 is indicated by arrows.

Die Wasserstrahlpumpe 12 ist teilweise innerhalb des Kühlbalkens 7 angeordnet. Ein nicht gezeigter Ausgang der Wasserstrahlpumpe 12 kann geodätisch tiefer als der Kühlflüssigkeitssee 10 angeordnet sein. Alternativ kann ein Ausgang 15 einer durch eine Strichlinie angedeuteten, kommunizierend mit dem Ausgang der Wasserstrahlpumpe 12 verbundenen Flüssigkeitsleitung 16 geodätisch tiefer als der Kühlflüssigkeitssee 10 angeordnet sein.The water jet pump 12 is partially arranged inside the chilled beam 7 . An outlet of the water jet pump 12 (not shown) can be arranged geodetically lower than the coolant pool 10 . Alternatively, an outlet 15 of a liquid line 16 indicated by a dashed line and connected in communication with the outlet of the water jet pump 12 can be arranged geodetically lower than the cooling liquid lake 10 .

BezugszeichenlisteReference List

11
Walzgerüstmill stand
22
obere Arbeitswalzeupper stripper
33
untere Arbeitswalzelower stripper
44
Walzspaltroll gap
55
Kühlvorrichtungcooler
66
Kühlflüssigkeitcoolant
77
Kühlbalkenchilled beam
88th
Spritzdüsespray nozzle
99
Abstreifer (obere Arbeitswalze)stripper (upper work roll)
1010
Kühlflüssigkeitsseecoolant lake
1111
Abstreifer (untere Arbeitswalze)stripper (lower work roll)
1212
Wasserstrahlpumpewater jet pump
1313
Druckwassereingangpressurized water inlet
1414
Ansaugeingangsuction inlet
1515
Ausgang von 16output of 16
1616
Flüssigkeitsleitungliquid line

Claims (3)

  1. Roll stand (1) comprising at least one upper work roll (2), at least one cooling device (5) for cooling the upper work roll (2), by which the upper work roll (2) can be acted on at the circumference by a cooling liquid (6), and at least one stripper (9), which is led up to the upper work roll (2) at the circumference and by which the cooling liquid (6) flowing off the upper work roll (2) can be collected on the stripper (9) with formation of a cooling liquid sea (10) bounded at one side by the upper work roll (2) and can be stripped off the upper work roll (2), characterised in that the cooling device (5) comprises at least one water jet pump (12) having a pressure water inlet (13), which is connected at least temporarily with a cooling liquid supply of the cooling device (5), and a suction inlet (14) immersed in the cooling liquid sea (10), wherein the water jet pump (12) is arranged at least partly within a cooling bar (7), by which the upper work roll (2) can be acted on by the cooling liquid (6), of the cooling device (5).
  2. Roll stand (1) according to claim 1, characterised in that an outlet of the water jet pump (12) or an outlet (15) of a liquid conduit (16) in communicating connection with the outlet of the water jet pump (12) is arranged geodetically deeper than the cooling liquid sea (10).
  3. Method of cooling the upper work roll (2) of a roll stand (1), wherein the upper work roll (2) is acted on at the circumference by a cooling liquid (6) and the cooling liquid (6) flowing off the upper work roll (2) is collected by means of a stripper (9), which is led up to the upper work roll (2) at the circumference, on the stripper (9) with formation of a cooling liquid sea (10) bounded at one side by the upper work roll (2) and is stripped off the upper work roll (2), characterised in that the cooling liquid of the cooling liquid sea (10) is pumped away with use of at least one water jet pump (12) arranged at least partly within a cooling bar (7), by which the upper work roll (2) can be acted on by the cooling liquid (6), of the cooling device (5), wherein a suction inlet (14) of the water jet pump (12) is immersed at least temporarily in the cooling liquid sea (10) and a pressure water inlet (13) of the water jet pump (12) is connected at least temporarily with a cooling liquid supply.
EP19740369.4A 2018-07-23 2019-07-15 Roll stand and method for cooling the upper working roll of a roll stand Active EP3826779B1 (en)

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DE102018212168.0A DE102018212168A1 (en) 2018-07-23 2018-07-23 Roll stand and method for cooling the upper work roll of a roll stand
PCT/EP2019/068990 WO2020020683A1 (en) 2018-07-23 2019-07-15 Roll stand and method for cooling the upper working roll of a roll stand

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EP3826779B1 true EP3826779B1 (en) 2022-01-26

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0899030B1 (en) * 1997-08-29 2003-10-01 SMS Demag AG Device and method for cooling the working rolls on the outlet side of a roll stand

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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JPH0679727B2 (en) 1985-05-20 1994-10-12 株式会社日立製作所 Roll cooling device for rolling mill
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EP3826779A1 (en) 2021-06-02
WO2020020683A1 (en) 2020-01-30

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