EP3246102A1 - Method and device for fast extraction of thick plates from a rolling mill - Google Patents

Abstract

The invention relates to a method and an apparatus for the rapid removal of metallic plates (21, 22) from heavy plate from a rolling mill. The object of the invention is to enable the safe discharge of relatively short plates (21, 22) with high speed and low cycle times from the rolling mill. This task is solved by the following method steps: - Transporting a first plate (21) on a roller table (9, 13) in the transport direction (T), wherein preferably the first plate (21) in the transport direction (T) is accelerated; - Laying the first plate (21) on the roller table (9, 13); - Transporting a second plate (22) on the roller table (9, 13) in the transport direction (T); - Laying the second plate (22) in the transport direction in front of the first plate (21) on the roller table (9, 13); and - Feeding the first and the second plate (21, 22) from the roller table (9, 13) in a tray (24), wherein the discharging takes place transversely to the transport direction (T).

Description

Field of engineering

The present invention relates to a method and an apparatus for the rapid removal of metallic plate from heavy plate from a rolling mill.

In this application, a plate made of heavy plate, hereafter referred to as a plate, is to be understood as meaning a metallic plate having a thickness of between 8 and 250 mm, a width of> 900 mm and a length of ≥ 3 m (see Documentation 570, "Heavy Plate Production and Application ", Steel Information Center Dusseldorf, 1st edition 2001).

On the one hand, the invention relates to a method for conveying metallic plates, preferably of steel, from a rolling mill, preferably a hot rolling mill or a cast-rolling composite plant.

On the other hand, the invention relates to an apparatus for the rapid removal of steel plates from a hot rolling mill.

State of the art

Usually, a slab strand is produced continuously (ie endlessly) in a continuous casting plant of a cast-rolled composite plant. The endless slab strand itself or a slab cut therefrom is then subjected to high-reduction forming in at least one rolling stand of a rough rolling mill. Thereafter, the pre-rolled slab strand (also called pre-strip) or the pre-rolled slab is heated in a reheating furnace and descaled in a descaling device. A subsequent multi-stand finishing train with at least 5, optionally up to 7 Rolling mills, produced, depending on the number of rolling mills in operation and the set reduction degrees, steel strips of different thickness. These strips are then cooled in a cooling zone to the required temperature and subsequently wound in at least two coiler alternately to steel coils (reels or English coils) . If necessary, the steel strip is divided into suitable lengths before winding.

In the case of this known route for the production of steel coils, hot strip can be produced in thicknesses of 0.6 mm to 25 mm and in certain circumstances also up to 30 mm (in the case of narrow widths and materials of low strength). These bundles can later be processed in a separate processing step or in a separate device into plates (so-called thin plates with thicknesses of less than 3 mm or heavy plates with thicknesses of 3 mm to 25 mm, optionally up to 30 mm).

In the EP 1909979 B1 For example, a cast-rolled composite plant is described for the production of boards with thicknesses up to 100 mm and widths up to 4000 mm. The slab produced in the continuous casting process is subjected to liquid core reduction (LCR) in the continuous casting machine; Subsequently, a reduction of the slab takes place in one or more rolling stands of a rolling train. Thereafter, the cooling and the transverse distribution of the strand to the desired plate length. The need for a descaling device in front of the rolling stands as well as a device for the thermomechanical treatment of special steel grades by means of intermediate cooling step between the reducing stands is described.

In the DE 102010063279 A1 a CSP plant for the production of thick tube grades or of thin strip is described. In the CSP plant, the produced thin strips or the described thick tube grades are wound on coiler lines to steel coils. These bundles can be further processed to separate plates in separate plants.

Another known production method for plates are plate mills. These mills are designed to roll the stock material or slabs longitudinally and / or transversely to produce sheets of varying thicknesses, widths and lengths. The heavy plate rolling mills have a reheating furnace, one or two rolling mills, a leveler, scissors and annealing, cooling and shelves for the plates. The rolling stands are usually operated reversing. Optionally turntables can also be used to turn the plates for the rolling process, plug-in ovens and edgers for correct width adjustment. This method is mainly used for thicker and / or wider plates. A production of hot strip with small thicknesses is uneconomical or not possible.

On a cutting device (engl. Cut-To-Length Line) also plates can be produced or further processed. The coils wound on the reel are unwound, straightened, transversely divided, processed into boards and stacked. In these devices, however, only plates with a thickness of up to about 16 mm can be produced.

In the WO 2009/121678 A1 a discharge device for a cast-rolling composite system is described, which allows the continuation of the continuous casting of cast-rolled composite plant in an emergency situation. Here, cut pre-product sections with a length of 8 to 14 m are discharged from the plant. At the given large plate lengths, by accelerating the cut precursor sections, sufficiently long gaps can be formed between the individual sections, so that collisions between the sections are avoided. In addition, the speeds of these precursors are still relatively small in order to transport the Vorproduktabschnitte from the plant.

Summary of the invention

An object of this invention is to provide a method and apparatus for discharging slabs from a cast-roll compound plant, wherein even relatively short slabs (eg, 3 to 8 meters in length) with high speed and low cycle times safely from the plant can be removed and stored.

A further object of this invention is to broaden the product range of a cast-rolling composite plant, in addition to the possibility described above for the production of steel coils on the cast-rolling composite plant also plates of different thickness and length can be produced. In this case, the system parameters, such as the number of rolling mills in operation and their reduction ratios, can be adjusted so that inline (ie in the cast-rolling composite system itself) plates with thicknesses of at least 8 mm to 25 mm, preferably up to 40 mm , Widths from 900 mm to 2100 mm, and lengths from 3 m to 18 m can be produced. In addition to tube grades, other grades should also be produced. In the production of plates, the material produced, for example, in continuous, continuous operation, should be able to be divided transversely at a suitable point. Subsequently, the plates are to be discharged from the system and stored with a predetermined length, so that the subsequent material can be freely produced further. It would be desirable if the Ausschleuse- and storage device could be easily and quickly changed to different plate lengths.

• Transportieren einer ersten Platte auf einem Rollgang in Transportrichtung, wobei vorzugsweise die erste Platte in Transportrichtung beschleunigt wird;
• Ablegen der ersten Platte auf dem Rollgang;
• Transportieren einer zweiten Platte auf dem Rollgang in Transportrichtung;
• Ablegen der zweiten Platte in Transportrichtung vor der ersten Platte auf dem Rollgang; und
• gleichzeitiges Ausfördern der ersten und der zweiten Platte vom Rollgang in eine Ablage.

This object is achieved by the aforementioned method with the following method steps:

• Transporting a first plate on a roller table in the transport direction, wherein preferably the first plate is accelerated in the transport direction;
• Placing the first plate on the roller table;
• Transporting a second plate on the roller table in the transport direction;
• Depositing the second plate in the direction of transport in front of the first plate on the roller table; and
• simultaneous removal of the first and the second plate from the roller table in a tray.

After the cross-cutting of a, for example endlessly produced, strand of a hot strip, whereby a strand of indefinite length a first plate is separated from the strand, the first plate is transported on the roller table in the transport direction. In this case, the first plate is preferably accelerated in the transport direction, so that a gap between the strand and the first plate is formed. After the first plate has reached a predefined position on the roller table, the first plate is placed on the roller table. Subsequently, a second plate is separated from the strand and the second plate is transported on the roller table in the transport direction. After the second plate has reached a predefined position on the roller table, the second plate is placed in the transport direction in front of the first plate on the roller table. As a result, at least two plates in a row (English in-line) are stored on the roller table. Subsequently, the first and the second plate are discharged from the roller table in a tray, wherein the discharge preferably takes place transversely to the transport direction. Alternatively, the plates can also be conveyed in the vertical direction (eg above or below the roller table). The conveying transverse to the transport direction is also referred to as cross-conveying; the facility for this is called cross conveyor.

By depositing several plates in a row on the roller table and the simultaneous discharge of several plates can be safely carried out at the same cycle time of the discharge even much shorter plates.

1. a) mehrere Platten werden durch einen Querförderer gleichzeitig (d.h. gemeinsam) ausgefördert, oder
2. b) mehrere synchron arbeitende Querförderer fördern jeweils eine Platte aus.

Auch eine Kombination ist denkbar, z.B. dass mehrere Querförderer jeweils mehrere Platten (bspw. 2 Querförderer die je 2 Platten) ausfördern.The simultaneous removal of several plates from the roller table can in principle be done in two ways:

1. a) several plates are conveyed by a cross conveyor at the same time (ie together), or
2. b) several synchronously working cross conveyor each promote a plate.

A combination is also conceivable, for example, that several transverse conveyors in each case a plurality of plates (eg. 2 transverse conveyors each 2 plates) ausfördern.

In the production of particularly short plates, it is advantageous if at least one third plate is transported on the roller table in the transport direction, and the third plate is placed in the transport direction in front of the second plate on the roller table. Subsequently, the first, second and third plates are discharged simultaneously. This either further reduces the minimum plate length for a given cycle time or increases the cycle time for a given plate length.

Due to the space available in a rolling mill, it is usually advantageous if the discharge of the plates takes place transversely to the transport direction.

• Anheben der zumindest einen Platte vom Rollgang;
• Transportieren der angehobenen Platte quer zur Transportrichtung vom Rollgang zur Ablage;
• Ablegen der zumindest einen Platte auf der Ablage; und anschließend
• Zurückkehren des Querförderers in die Ausgangsposition, sodass der Querförderer erneut zumindest eine Platte Ausfördern kann.

When feeding out, it is expedient if a cross conveyor performs the following steps:

• Lifting the at least one plate from the roller table;
• Transporting the raised plate transversely to the transport direction of the roller table for storage;
• Depositing the at least one plate on the tray; and subsequently
• Returning the cross conveyor to the starting position so that the cross conveyor can again convey at least one plate.

• Greifen der zumindest einen Platte am Rollgang durch einen Greifer;
• Schwenken des Greifers um eine Schwenkachse, die parallel zur Transportrichtung ausgerichtet ist;
• Lösen der geschwenkten Platte vom Greifer und Ablegen der Platte auf der Ablage; und anschließend
• Zurückkehren des Greifers in die Ausgangsposition, sodass der Greifer erneut zumindest eine Platte Ausfördern kann.

Alternatively, the discharge can also be carried out by the following method steps:

• Gripping the at least one plate on the roller table by a gripper;
• Pivoting the gripper about a pivot axis aligned parallel to the transport direction;
• Releasing the pivoted plate from the gripper and placing the plate on the tray; and subsequently
• Returning the gripper to the starting position, so that the gripper can again convey at least one plate.

The stacking of several plates on a shelf is particularly simple when the shelf is lowered after laying down the at least one plate by at least the plate thickness.

In a rolling mill, the plates are separated from a strip / strand by transverse cutting before being transported on the roller table in the transport direction.

• einen Rollgang zum Transportieren einer Platte in Transportrichtung, wobei der Rollgang mehrere angetriebene Rollen zum Beschleunigen der Platte in Transportrichtung aufweist;
• zumindest ein Mittel zum Ablegen der Platte auf dem Rollgang, wobei die Platte bei einer festgelegten Position ablegbar ist;
• einen Querförderer zum gleichzeitigen Ausfördern mehrerer Platten vom Rollgang in eine Ablage oder mehrere Querförderer zum synchronen Ausfördern von zumindest je einer Platte quer zur Transportrichtung vom Rollgang in eine Ablage.

The object mentioned at the outset is likewise achieved by a device for rapid removal of steel plates from a hot rolling mill, comprising

• a roller table for transporting a plate in the transport direction, the roller table having a plurality of driven rollers for accelerating the plate in the transporting direction;
• at least one means for depositing the plate on the roller table, the plate being disposable at a predetermined position;
• a cross conveyor for simultaneously conveying a plurality of plates from the roller table in a tray or a plurality of cross conveyor for synchronously conveying at least one plate transversely to the transport direction of the roller table in a tray.

The delivery device with a plurality of cross conveyors for the synchronous discharge of at least one plate each comprises a synchronization device (eg an operative connection between the control devices (see "electric shaft") of the cross conveyors, or a mechanical connection between the cross conveyors) for synchronizing the cross conveyors.

In a simple and robust embodiment, the means for depositing the plate on the roller table comprises a stop and preferably an actuator (for example a hydraulic, pneumatic or electric actuator) for extending and retracting the stop into the transport path of the plate on the roller table.

According to an alternative, particularly simple embodiment, the means for depositing is designed as a brakable roller table role.

Collisions between the plates can be avoided if the roller table comprises several - arranged in the transport direction one behind the other - means for storing.

A simple transverse conveyor has a lifting rail, a Hubaktuator for lifting the lifting rail, a carriage for moving the plate transversely to the transport direction, and a Verfahraktuator for moving the Verfahrwagens on the lifting rail.

It is expedient if the lifting rail has a plurality of arms, wherein in the starting position between two arms at least one roller table roller is arranged. In the application, the starting position is understood to be any position which the transverse conveyor assumes transversely to the transport direction immediately before the plates are conveyed out.

Another simple transverse conveyor has a gripper for clamping a plate and a pivoting unit for pivoting the plate about an axis of rotation aligned in the direction of transport.

A simple storage is formed by a height-adjustable storage table with an actuator for height adjustment of the delivery table.

• einen Rollgang zum Transportieren der Platte in Transportrichtung durch die Kühlstrecke,
• zumindest eine mengenverstellbare Kühldüse,
• zumindest ein Detektor zur Bestimmung der Geschwindigkeit der Platte in der Kühlstrecke, und
• eine Stelleinrichtung zur Einstellung der Kühlmittelmenge durch die Kühldüse

umfasst, die Verfahrensschritte aufweist:

• Transportieren der Platte durch die Kühlstrecke,
• Detektieren der Geschwindigkeit der Platte in der Kühlstrecke,
• Zuführen der Geschwindigkeit an die Stelleinrichtung, und
• Einstellen der Kühlmittelmenge durch die Kühldüse in Abhängigkeit von der Geschwindigkeit mittels der Stelleinrichtung, sodass die Platte gleichmäßig abgekühlt wird.

Since the plate is preferably cut after the last stand of the finishing train and before the plate enters the cooler, and the plate is accelerated after being cut on the roller table to create a gap between the continuously produced hot strip and the plate, the plates become have a variable transport speed depending on the time course of the acceleration. But even in this case, to achieve a uniform cooling of the plate, it is advantageous when cooling a plate in the cooling section, wherein the cooling section

• a roller table for transporting the plate in the transport direction through the cooling section,
• at least one volume-adjustable cooling nozzle,
• at least one detector for determining the speed of the plate in the cooling section, and
• an adjusting device for adjusting the amount of coolant through the cooling nozzle

comprising, the method steps comprises

• Transporting the plate through the cooling section,
• Detecting the speed of the plate in the cooling section,
• Supplying the speed to the actuator, and
• Adjusting the amount of coolant through the cooling nozzle as a function of the speed by means of the adjusting device, so that the plate is cooled evenly.

• einen Rollgang zum Transportieren der Platte in Transportrichtung durch die Kühlstrecke,
• zumindest eine mengenverstellbare Kühldüse,
• zumindest ein Detektor zur Bestimmung der Geschwindigkeit der Platte in der Kühlstrecke, und
• eine Stelleinrichtung zur Einstellung der Kühlmittelmenge durch die Kühldüse.

The corresponding cooling section comprises

• a roller table for transporting the plate in the transport direction through the cooling section,
• at least one volume-adjustable cooling nozzle,
• at least one detector for determining the speed of the plate in the cooling section, and
• an adjusting device for adjusting the amount of coolant through the cooling nozzle.

The adjusting device can be designed, for example, as a control or regulating device. In the case of the control device the desired coolant quantity is calculated as a function of the speed and the actual coolant quantity is adjusted in such a way that the difference between the desired and the actual coolant quantity is as small as possible.

It is advantageous if the speed is detected several times during the passage of the plate through the cooling section and the cooling section has a plurality of cooling zones (with at least one cooling nozzle each). Thus, the cooling of the plate can be set very accurately even with transient speed or acceleration curves. The determination of the speed in a section may e.g. be done by position detectors that determine the transit time of the plate between two positions and thus the speed can be easily determined by knowing the distance between two detectors. Alternatively, however, the speed may be determined differently, e.g. by measuring the speed of the roller table rollers, by laser Doppler anemometry etc.

Brief description of the drawings

• Fig 1a und 1b: eine schematische Seitenansicht einer Gieß-Walz-Verbundanlage zur Herstellung von Bunden aus bandförmigen Stahlblech und von Platten aus Grobblech
• Fig 1c: eine Draufsicht auf die Fig 1b
• Fig 2: eine schematische Seitenansicht des Querförderers zum Ausfördern von Platten
• Fig 3: eine schematische Draufsicht auf den Querförderer nach Fig 2
• Fig 4a bis 4e: eine schematische Darstellung der Verfahrensschritte beim Ausfördern
• Fig 5: eine schematische Darstellung einer Schwenkeinheit mit einem Greifer zum Ausfördern von Platten
• Fig 6a bis 6f: eine schematische Darstellung von zwei Querförderern zum Ausfördern von Platten unterschiedlicher Länge
• Fig 7: eine Detaildarstellung der Kühlstrecke 10 aus Fig 1b.

Further advantages and features of the present invention will become apparent from the description of non-limiting embodiments, wherein the following figures show:

• FIGS. 1a and 1b : A schematic side view of a cast-rolling composite plant for the production of coils of strip-shaped steel sheet and plates made of heavy plate
• Fig. 1c : a top view on the 1b
• Fig. 2 : A schematic side view of the cross conveyor for discharging plates
• Fig. 3 : a schematic plan view of the cross conveyor after Fig. 2
• 4a to 4e : a schematic representation of the process steps in the conveying out
• Fig. 5 : a schematic representation of a pivoting unit with a gripper for conveying out plates
• 6a to 6f : A schematic representation of two transverse conveyors for discharging plates of different lengths
• Fig. 7 : a detailed representation of the cooling section 10 from 1b ,

Description of the embodiments

• Vergießen eines flüssigen Stahls in einer Stranggießanlage 1 zu einem Dünnbrammenstrang mit 70 mm - 125 mm Dicke und einer Breite von 900 bis 2100 mm, wobei der Dünnbrammenstrang mit einem flüssigen Kern in der bogenförmigen Strangführung 2 der Stranggießanlage 1 einer sogenannten "Liquid Core Reduction" (LCR) unterzogen wird.

The production of plates of different thickness, width, length and material runs in an Arvedi ESP casting / rolling compound plant ( Endless Strip Production) acc. Figures 1a-1c as follows:

• Casting a liquid steel in a continuous casting plant 1 into a thin slab strand having a thickness of 70 mm to 125 mm and a width of 900 to 2100 mm, wherein the thin slab strand having a liquid core in the arcuate strand guide 2 of the continuous casting plant 1 is known as "liquid core reduction" (US Pat. LCR) is subjected.

The endlessly produced thin slab strand is after leaving the continuous casting in a roughing 3 by at least one to max. 4 rolling mills with a high degree of reduction pre-rolled. After the pre-rolled slab strand, the so-called pre-strip 17 (English transfer bar), has passed through a pendulum shear 4 uncut, it is reheated in an induction furnace 5 and descaled in a subsequent descaling 6. After descaling, the pre-rolled pre-strip is in a multi-stand finishing line 7 with at least 4, preferably min. 5, rolling stands 7a ... 7d finished rolled to a finished strip 18 or a plate strand, wherein, depending on the desired final thickness of the hot-rolled product, a different number of rolling stands are engaged and / or different degrees of reduction are set.

After the finish rolling of the hot strip in the last roll stand 7d, the still endless finished strip 18 is transversely divided by a pair of scissors 8 in plate lengths of 3 m to 18 m. Just like in the 1b shown, the scissors 8 is located immediately behind the last frame 7d of the finishing train 7. Alternatively, the scissors 8 could also be arranged upstream of the finishing train 7 or even behind the cooling section 10. An arrangement of the pair of scissors 8 immediately after the finishing train 7, however, is advantageous because compared to the arrangement of the scissors 8 before the finishing line 7, the head of the cut hot strip not after each cut in the rolling stands 7a ... 7d of the finishing train 7 must be threaded. Furthermore, the arrangement shown is also advantageous over an arrangement of the scissors 8 after the cooling section 10, since the cutting forces due to the higher temperature of the hot strip after the finishing train 7 are substantially lower.

Immediately after cutting off a plate from the endless finished strip 18, the plate is accelerated on the roller table 9 by a plurality of driven roller conveyor rollers 9a in the transport direction T in order to produce as large a gap as possible between the finished strip 18 and the plate. This gap is determined by the length of the plate, the acceleration of the plate and the acceleration time. In general, the shorter the plates are, the smaller the cycle time for feeding out the plates, and the smaller the gaps between the plates.

For example, Table 1 below shows the relationship between the slab length L, the slicing sequence t at a sliver speed of 0.8 m / s, and the slab clearance Δs when the slab accelerates from a = 1 m / s ² v = 3 m / s. In addition, in the last column, the sequence time t _Sequ (also called cycle time) is shown for the cross conveyor, if at the same time n plates are carried out. Table 1: Cutting sequence and sequence time L [m] Δs [m] t [s] n t _Sequ [s] 3 7.80 3.60 4.00 14,40 6 15,60 7.20 2.00 14,40 9 23,40 10,80 2.00 21.60 12 31,20 14,40 1.00 14,40 15 39,00 18,00 1.00 18,00 18 46,80 21.60 1.00 21.60

In addition to the advantages presented above, it is advantageous to cross-divide the plates produced in the endless process only after the last rolling stand 7d, because thereby the properties of the material (straightness and flatness of the head or foot of the plates) remain approximately constant and no further processing steps in the Production line are necessary.

In contrast, in the prior art processes in which the pre-strip 17 is transversely divided in front of the finishing train 7 or already slabs of limited length are used in a rolling train 3, 7, the contour of the head and the foot (the so-called engl. head end and tail end) of the plates by the constant threading and unthreading in each reducer so deformed or bent in the vertical direction that the stacking or further processing of such plates only with an additional Besäumschnitt (each Besäumschnitt produces scrap and reduced the productivity of the plant) or straightening process is meaningfully possible.

After cutting, the plate is cooled in a cooling section 10. In the cooling section 10, the variable speed of the plate is taken into account due to the acceleration by dynamic control of the cooling rates. To the position of the head of the plate is tracked within the cooling section ( tracking). This ensures, on the one hand, a uniform surface temperature of the plate (including the plate head and foot). The tracking of the plate within the cooling section can, for example, by several inductive detectors below or above the roller table, which register the passage of a plate. Depending on the speed of the plate on the roller table within the cooling section, the plurality, in the transport direction successively arranged and independently adjustable cooling nozzles, adjusted so that all longitudinal sections of the plate are subjected to the same amount of water.

After the cooling section 10, the plates produced are transported to the discharge device 14 by means of the roller table 13 and via the coiler units 11a, 11b. For this purpose, the tape catcher - in the 1b is a so-called. Fang basket 12 shown, which can be opened by an electric or hydraulic actuator (the unfolded position is shown in broken lines) - unfolded, raised or twisted. As a result, the transport path of the plates on the roller table 13 to the discharge device 14 is released. In all operating conditions, especially in the event of a power failure, during the production of bundles on the ESP system, the belt catcher 12 prevents the finished strip 18 from reaching the outfeed device 14.

About the subsequent roller table 13, the plates are transported to the discharge device 14. In this area, for presetting the plate position transversely to the transport direction T, it is possible to provide so-called adjustable side guides, which can be adapted hydraulically or electromechanically to the plate width. In addition, a leveler can be arranged in this area to compensate for possible bends or bends of the plates.

The discharge device 14 is designed so that the strand continuously cast by the continuous casting machine 1 or the finish strip 18 continuously hot rolled in the finishing train 7 can be delivered unhindered, discharged from the hot rolling mill and stacked without disturbing the continuous operation of the casting / rolling composite plant or the production speed is affected. This requirement can not be met in the case of devices according to the prior art, especially for short plates, since the cycle times t _Sequ for the discharge device 14 are too short. In contrast, this requirement is met in the invention by several stored on the roller table successively discharged plates simultaneously; This increases the cycle time.

The Figures 2 and 3 show a first embodiment of a discharge device 14 for discharging heavy plates made of steel from the ESP cast-rolling composite plant gem. the Fig. 1a-1c ,

The discharge device 14 comprises a roller table 13, can be transported in the transport direction T on the plates 21, 22, a means for depositing a first plate 21 in the form of the rear stop 26a and means for placing a second plate 22 on the roller table 13 in the form the front stop 26b, and a cross conveyor 15 for simultaneously conveying two plates 21, 22 transversely to the transport direction T on a tray 24. The roller table 13 is formed of a plurality of driven 9a roller table rollers 31; In addition, non-driven roller conveyor rollers may be present. As in Fig. 3 shown, are two plates 21 and 22 in succession on the roller table 13 before feeding.

Before the actual discharge of the plates 21, 22 in the discharge device 14, the endless finished strip 18 after the last frame 7d of the finishing train 7 by the scissors 8 transversely divided (see 1b ). This creates a The first plate 21 is transported on the roller table 9 through the cooling section 10 and accelerated by driven rollers 9a of the roller table 9 in the transport direction T. By accelerating, a gap is formed between the finished strip 18 and the first plate 21, so that collisions are reliably avoided.

After the first plate 21 has passed the reeling devices 11a, 11b and the unfolded catching basket 12, the first plate 21 runs on the roller table 13, also referred to as the connecting roller conveyor, into the discharge device 14.

In the discharge device 14 itself, the first plate 21 is further transported in the transport direction T until it is deposited on the roller table 13 by a means for depositing the first plate, which is formed as a rear stop 26a. The stop 26a is pivoted by an actuator, not shown, in the transport path of the first plate 21, whereby the transport path is blocked. The first plate 21 rests on at least two roller table rollers 31.

In an alternative embodiment, a means for depositing is formed as a light barrier or a camera, which is operatively connected to a plurality of driven roller table rollers 31. Once a plate has reached a predetermined storage position, the roller table rollers 31 are braked so that the plate is placed on the roller table.

Thereafter, or in the meantime, the scissors 8 has separated a second plate 22 from the endless finishing strip 18. Also, the second plate 22 is transported on the roller table 9 in the transport direction T to the discharge device 14. Before the second plate 22 has reached the storage position on the roller table 13, a front stop 26 b is pivoted into the transport path, whereby the second plate 22 is stored in the transport direction T in front of the first plate 21 on the roller table 13.

The second plate 22 rests on at least two roller table rollers 31.

As an alternative to the formation of a plurality of stops 26a, 26b, the discharge device 14 could also have only one stop (for example the rear stop 26a), wherein the second plate 22 with the first plate 21 or possibly a third plate not shown with a second Plate 22 would collide. However, in particular for relatively thin plates, it is advantageous to provide a plurality of stops, since so deformations of the plates are prevented due to collisions.

In order to increase the cycle time t _Sequ for the cross conveyor 15, even with relatively short plates, it is essential that at least two plates 21, 22 are discharged at the same time. This can be done either by a single cross conveyor 15, the same time ausfördert several plates, or by several, simultaneously working, cross conveyors (see the cross conveyor 15, 15 'in Fig. 6 , Item a), each carrying at least one plate.

The cross conveyor 15 itself is in the Fig. 2 and 3 shown. In each case between two - in the transport direction T successive - roller conveyor rollers 31, an arm 30 is arranged, which via a Verfahrwagen 29 (the process takes place in the case illustrated by a linear motor 29a, eg an electric linear drive, a hydraulic or pneumatic cylinder, etc.) in the movement direction V can be moved. The carriage 29 is supported by wheels on a lifting rail 27, which can be lifted and lowered by one or more lifting cylinder 28. The lifting rail 27 is supported relative to the stationary support structure via two pivoting levers, wherein the in Fig. 2 shown right pivot lever can be raised or lowered by the lifting cylinder 28.

The lifting of the first and second plates 21, 22 from the roller table rollers 31 of the roller table 13 is in Fig. 4a shown. When lifting the Hubaktuator 28 is extended, whereby the lifting rail 27 is raised. By lifting the lifting rail 27, the plates 21, 22 are each lifted by one arm 30 (but it could also be more than one arm per plate) of the roller table rollers 31 of the roller table 13.

After lifting the plates 21, 22 are moved by the carriage 29 in the direction of travel V in the direction of the tray 24. The method is performed by extending one or more actuators 29a (see 4b ).

The situation after moving the plates 21, 22 in the direction of travel V is in Fig. 4c shown. The plates 21, 22 are stored by the method on driven roller table rollers 34, which are arranged transversely to the direction of travel V and thus parallel to the transport direction T (these rollers are hereinafter also referred to as transverse rollers) stored. The storage and the rotary drives for the transverse rollers 34 are not shown in the figures for reasons of clarity; however, it will be apparent to those skilled in the art how to perform rotary driven rollers.

In Fig. 4d It is shown how the plates 21, 22 are deposited on the transverse rollers 34 by retracting the lifting actuator 28, and the traveling carriage moves back against the direction of travel (shown as minus V) to the starting position. After depositing the plates 21,22 are transported by the driven transverse rollers 34 in the direction of travel V on to the tray 24.

In 4e has the cross conveyor 15 again reached the starting position, so again several plates 21,22 can be discharged from the hot rolling mill. After the plates 21, 22 have been placed on the storage table 33 of the tray 24, the tray is lowered at least by the plate thickness. In the Fig. 5 a second embodiment of the cross conveyor 15 is shown. The cross conveyor 15 comprises a gripper 25 arranged through two left and right of the plates 21, 22 for clamping the plates and a pivoting unit 32 for pivoting the plates about an axis of rotation D, which is aligned parallel to the transport direction T.

After the plates 21, 22 have been clamped by the gripper 25, the pivoting unit 32 is pivoted by approximately 180 °, whereby the plates are brought from the left to the position shown in the right. Subsequently, the plates 21,22 are released from the gripper 25 and stored on the storage table 33. After placing the plates, the pivot unit 32 is pivoted back into the starting position, so that again several plates can be discharged.

The Fig. 6 with the sub-figures a to f shows schematically a representation of a discharge device 14 with two successively arranged transverse conveyors 15, 15 'in the discharge of plates with different lengths. With regard to the sequence times t _Sequ , reference is made to Table 1 and to the underlying parameters.

The Fig. 6a shows the discharge of a first plate 21 with 18 m length. The plate is deposited on the roller table 13 by a first stop 26a. According to Table 1, t _Sequ = 21.6 s.

Both Fig. 6b and 6c The plate length is 15 or 12 m. The sequence times are t _Sequ = 18 s and t _Sequ = 14.4 s. Again, the position of the plates 21 on the roller table 13 is defined by the first stop 26a.

In the Fig. 6d two plates, a first plate 21 and a second plate 22, each with 9 m length are discharged simultaneously. The sequence time is t _Sequ = 21.6 s. In contrast, the sequence time for single discharge of a 9 m long plate would only be t _Sequ = 10.8 s. The Position of the first plate 21 is defined by the stop 26a, the position of the second plate 22 by the stop 26b.

In Fig. 6e shows the simultaneous discharge of two plates 21, 22, each with a length of 6 m. The sequence time is t _Se-qu = 14.4 s.

Finally, the shows Fig. 6f the simultaneous discharge of four plates, each with a length of 3 m. Again, the sequence time t _Sequ = 14.4 s.

The Fig. 7 shows a cooling device 10 according to the invention with two cooling zones, wherein only the first cooling zone with seven cooling nozzles 42 has been shown in detail. From the finished strip 18, a plate 21 is separated after the last frame of the finishing train, not shown here. The plate 21 is accelerated by the driven roller table rollers 9a, wherein the speed of the plate 21 is determined by two metal detectors 40 spaced apart in the transporting direction T. Subsequently, the plate 21 enters the cooling section 10, where it is cooled in two cooling zones. The cooling nozzles 42 in the illustrated first cooling zone will be supplied by a coolant pressure supply P with coolant (only water or water with air). Depending on the speed of the plate 21, the coolant flow through the valve 41 is set such that the plate is uniformly cooled, regardless of their speed when passing through the cooling zone 10.

While the invention has been further illustrated and described in detail by the preferred embodiments, the invention is not limited by the disclosed examples, and other variations can be derived therefrom by those skilled in the art without departing from the scope of the invention.

LIST OF REFERENCE NUMBERS

1

continuous casting

2

strand guide

3

roughing

4

pendulum shears

5

induction furnace

6

descaling

7

finishing line

7a ... 7d

Roll stand of the finishing train

8th

scissors

9

roller table

9a

driven roller table roller

10

cooling section

11a, 11b

coiler

12

catcher

13

roller table

14

unloading device

15, 15 '

cross conveyor

17

pre-strip

18

finished strip

21

first plate

22

second plate

24

filing

25

grab

26a, 26b

attack

27

lifting rail

28

lifting cylinder

29

traversing

29a

Verfahraktuator

30

poor

31

Roller conveyor roll

32

swivel unit

33

tray table

34

handscroll

40

metal detector

41

Control valve

42

cooling nozzle

43

setting device

D

axis of rotation

P

Coolant pressure supply

T

transport direction

V

traversing

Claims (8)

Method for cooling a plate (21, 22) in a cooling section (10), wherein the cooling section (10) - A roller table (9) for transporting the plate (21,22) in the transport direction (T) through the cooling section (10), at least one volume-adjustable cooling nozzle (42), - At least one detector (40) for determining the speed of the plate (21,22) in the cooling section (10), and - An adjusting device (43) for adjusting the amount of coolant through the cooling nozzle (42) comprising, comprising the method steps Transporting the plate (21, 22) through the cooling section (10), Detecting the speed of the plate (21, 22) in the cooling section (10), - Supplying the speed to the adjusting device (43), and - Setting the amount of coolant through the cooling nozzle (42) in dependence on the speed by means of the adjusting device (43), so that the plate (21,22) is cooled evenly. The method of claim 1, wherein the speed is detected several times during the passage of the plate (21, 22) through the cooling section (10) and the cooling section (10) has a plurality of cooling zones with at least one cooling nozzle (42). Cooling section (10) for cooling a plate (21, 22), the cooling section (10) - A roller table (9) for transporting the plate (21,22) in the transport direction (T) through the cooling section (10), at least one volume-adjustable cooling nozzle (42), - At least one detector (40) for determining the speed of the plate (21,22) in the cooling section (10), and - An adjusting device (43) for adjusting the amount of coolant through the cooling nozzle (42). Cooling section according to claim 3, wherein the adjusting device (43) is designed as a control or regulating device. Cooling section according to claim 4, wherein the control device calculates the desired coolant quantity as a function of the speed of the plate (21, 22) in the cooling section (10) and adjusts the actual coolant quantity in such a way that the difference between the desired and actual values Coolant quantity is as low as possible. Cooling section according to one of claims 3 to 5, wherein the speed is several times during the passage of the plate (21, 22) through the cooling section (10) is detected and the cooling section (10) has a plurality of cooling zones with at least one cooling nozzle (42). A cooling line according to claim 6, wherein the speed in a section is provided by position detectors which determine the transit time of the plate between two positions and which determine the speed by knowing the distance between two detectors. Cooling section according to claim 7, wherein the speed is determined by measuring the speed of roller castors or by laser Doppler anemometry.

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