EP2010347B1 - Spray-nozzle adjusting device - Google Patents

Abstract

The subject matter of the invention is a spray-nozzle adjusting device in a strand guide (2) of a continuous casting plant for producing metal strands of different strand width, wherein the strand guide comprises strand guide rollers (3, 3a, 3b, 3c, ...) which are supported in a support frame (2a) and form a transport path (1c) for the metal strand, and at least two spray nozzles (5a, 5b) are assigned to this transport path in a plane lying normal to the strand delivery direction (R) between adjacent strand guide rollers, said spray nozzles (5a, 5b) each being connected to an adjusting device (12) for changing the distance between the spray nozzles and for changing the normal distance of the spray nozzles from the transport path. To ensure ease of maintenance and good accessibility of the adjusting device, it is proposed that a spray nozzle holder (10) be assigned to each spray nozzle (5a, 5b) arranged in a plane lying normal to the strand delivery direction and that the spray nozzle holder be fastened to an actuating piston (11) of at least one adjusting device (12), wherein, during an axial adjusting movement of the actuating piston, an adjusting movement of the spray nozzles which is parallel to this axial adjusting movement is effected, and the adjusting device (12) is fastened to the support frame (2a) of the strand guide (2) in a region lying at a distance from the transport path (1c).

Description

The invention relates to a spray nozzle adjustment device in a strand guide of a slab continuous casting plant for the production of metal strands of different strand width, wherein the strand guide comprises supported in a scaffolding frame strand guide rollers, which form a transport path for the metal strand and this transport path in a normal to the strand conveying direction plane between adjacent , in strand conveying direction successive, strand guide rollers are associated with at least two spray nozzles with which fan-shaped coolant jets are applied to a broad side surface (1 a, 1 b) of the metal strand and each with an adjusting device for changing the distance of the spray nozzles to each other and to change the normal distance of Spray nozzles are connected by the transport path and each arranged in a plane perpendicular to the strand conveying direction plane spray nozzle is associated with a spray nozzle holder.

In a continuous casting of the continuous casting mold leaving, at least partially solidified strand in the downstream strand guide, which is usually formed by successive strand guide sections, subjected to intensive spray cooling. The coolant, usually atomized water or a water-air mixture, is spray-shaped by means of spray nozzles into a free space between successive in the strand conveying direction strand guide rollers. Since in a continuous casting usually metal strands are cast with different strand width, it is necessary to position the spray nozzles so that a uniform coolant loading of the strand surface is achieved in a direction normal to the strand transport direction plane. In strands with slab cross-sections, this cooling is limited here mainly to the broad side surfaces of the cast strand.

In slab cross sections two, possibly three spray nozzles are arranged side by side with increasing slab width to ensure an approximately uniform coolant on the broad side surface of a slab and to ensure the most uniform cooling of the metal strand. A Uneven cooling leads to cracking of the slab especially in the surface and edge area.

To ensure a uniform coolant application, it is therefore already known adjusting devices for changing the distance from in a normal plane to Strangtransportrichtung arranged spray nozzles to each other and the normal distance of the spray nozzles from the surface of the metal strand to arrange. This is intended to avoid undesired overlapping of the spray compartments of adjacent spray nozzles and overmolding of the slab edges.

From the DE 25 07 971 A1 already a nozzle adjustment is known in which a plurality of spray nozzles are hinged to a lever system, for example in the manner of a parallel link system. An adjustment of this lever system causes in the described embodiment with three arranged in a plane spray nozzles the formation of three Sprühfächern that are adjustable at each selected slab width with constant overlap area and without overmolding the slab edges from an operating position to another operating position. For this purpose, an element of the lever mechanism is moved with an adjusting spindle in the desired direction.

From the DE 26 36 666 B1 is also a Düsenverstelleinrichtung known, which is formed by a plurality of coupled parallel linker systems, each of these parallel linker systems carries a spray nozzle and the entire system is adjustable by means of handwheel from an operating position to a further operating position corresponding to the selected slab width.

Similar Düsenverstelleinrichtungen for different strand formats are further from the DE 30 39 443 A1 , of the DE 32 07 668 A1 and the EP 0 028 686 A1 already known.

The Düsenverstelleinrichtungen work within the strand guide at a small distance to the hot metal strand in a thermally highly loaded area and are also subject to a high pollution load, so that the joints of these complex kinematic chains are prone to failure in their functionality. In addition, these movable internals are in the strand guide elements or segments in hard to reach areas, making repair work are difficult to perform.

Object of the present invention is therefore to avoid the disadvantages described above and to propose a Spritzdüsenverstelleinrichtung, which is characterized by particular ease of maintenance and good accessibility.

This object is achieved on the basis of a spray nozzle adjustment of the type described above in that the spray nozzle holder is attached to a control piston at least one adjustment, wherein at an axial adjustment of the actuating piston is parallel to this axial adjustment adjustment of the spray nozzles and the adjusting device on the scaffolding frame the strand guide is fastened in a freely accessible outer region of the strand guide away from the transport path. Thus, all adjustment and control devices are positioned in a remote from thermal influence area. An arrangement which is stable under the given operating conditions is ensured by a connection of these two components that does not allow any relative movement between the adjusting piston and the spray nozzle holder.

In order to ensure optimum coolant distribution over the set strand width at all possible strand widths, it is expedient that the angle of inclination of the adjusting piston of the adjustment to the imaginary surface of the transport path in a plane normal to the strand conveying direction corresponds to the opening angle of the emerging from the spray nozzle coolant jet. The opening angle of the coolant jet is also in this plane. In this case, the opening angle of the coolant jet issuing from the spray nozzle and thus the design of the spray nozzle must be determined so that the spray pressure of the coolant jet impinging on the strand surface does not vary too much depending on the distance of the spray nozzle from the metal strand surface. The opening angle and the distance of the nozzle opening from the strand surface, the specific coolant application and thus the cooling power is influenced at the strand surface.

As a coolant, treated cooling water (water cooling) or with a nebulizer, preferably air, atomized cooling water (air-mist cooling) is used.

The number of necessary adjustment along the strand guide should be minimized. This can be achieved by assigning spray nozzles arranged one behind the other along the transport path in a plurality of successive planes in the strand conveying direction to a spray nozzle holder extending in the strand conveying direction and being synchronously adjustable with the latter.

To avoid vibrations on the spray nozzle holder and to its general stabilization of the spray nozzle holder is guided with at least one guide element on the adjusting device. Suitably, the longitudinal axis of the adjusting piston of the adjusting device and the longitudinal axes of the at least one guide element are arranged in a plane and the adjusting piston of the adjusting device is preferably arranged between two guide elements.

The adjusting device preferably comprises a hydraulically or pneumatically actuated pressure medium cylinder.

The spray nozzle comprises in addition to the actual nozzle body, in which the atomization of the spray and at the outlet opening of which the formation of the Sprühfächers takes place, a coolant line and a coolant passage, wherein the coolant passage is connected to the spray nozzle holder, and the coolant line in a guide element in a plane lying normal to the strand conveying direction is slidably guided and the guide element is fixed in a strand guide roller support frame on the scaffolding frame of this strand guide roller support frame. The coolant line comprises in a two-fluid cooling both a conduit for the cooling water and a line for the Zerstäubermittel.

To ensure easy assembly and disassembly of the adjusting and / or the spray nozzle, the guide element for receiving the coolant line is formed as a guide fork with a lying in a normal to the strand conveying direction open guide slot. The guide member may be adjustably configured to allow accurate positioning of the spray nozzles between successive strand guide rollers.

In order to be able to attach a plurality of spray nozzles arranged in the strand conveying direction one behind the other to a common spray nozzle holder and at the same time to ensure a clear positioning of the spray fan between the strand guide rollers, the coolant feedthrough is designed as a rotary feedthrough which forms a pivoting movement in one parallel to the strand conveying direction lying level permits.

To avoid self-oscillations of the long spray nozzles and vibrations caused by recoil forces exiting the nozzle openings coolant jet be caused, the coolant line is reinforced with a support plate in a direction normal to the strand conveying direction plane.

For over-wide slabs, it is advisable to arrange more than two spray nozzles next to each other. In the arrangement of at least three spray nozzles in a normal to the strand conveying direction plane, the spray nozzle holder of the external spray nozzles are connected to a connecting linkage and arranged between these outer spray nozzles further spray nozzles are suspended with their spray nozzle holders on this connecting linkage.

A structurally simple embodiment is that in the arrangement of at least 3 spray nozzles in a plane lying normal to the strand conveying direction, the inner spray nozzles are fixed to an immovably fixed spray nozzle holder.

For automatic adjustment of the nozzle positions of the current slab widths of each adjustment control and control devices, in particular a displacement sensor and a preferably hydraulic actuator for position setting of the actuating piston, assigned, which in turn are connected to the plant control system.

Preferably, the adjusting device for positioning the spray nozzles comprises a hydraulic actuator with switching valves, which are controlled via a three-point controller or via a pulse width modulated controller.

Fig. 1

das Grundprinzip der erfindungsgemäßen Spritzdüsen-Verstelleinrichtung für zwei unterschiedliche Strangbreiten an einer Seite eines gegossenen Stahlstranges in einer schematischen Darstellung in einer Schnittebene normal zur Strangtransportrichtung durch die Strangführung einer Stranggießanlage,

Fig. 2

das Grundprinzip der erfindungsgemäßen Spritzdüsen-Verstelleinrichtung bei zwei unterschiedlichen Strangbreiten an einer Seite eines gegossenen Stahlstranges in einer schematischen Darstellung in einem Teillängsschnitt durch die Strangführung einer Stranggießanlage,

Fig. 3

Darstellung der geometrischen Lageveränderung einer Spritzdüse zwischen benachbarten Strangführungsrollen in einer gebogenen Strangführung,

Fig. 4

die Befestigung einer Spritzdüse an einem Spritzdüsenhalter nach einer ersten möglichen Ausführungsform,

Fig. 5

die Befestigung einer Spritzdüse an einem Spritzdüsenhalter nach einer zweiten möglichen Ausführungsform,

Fig. 6

eine Draufsicht auf eine Verstelleinrichtung mit Spritzdüsenhalter,

Fig. 7

eine mögliche Ausführungsform der erfindungsgemäßen Spritzdüsen-Verstelleinrichtung mit 3 Spritzdüsen in einer Schnittebene normal zur Strangtransportrichtung durch die Strangführung einer Stranggießanlage.

Further advantages and features of the present invention will become apparent from the following description of non-limiting embodiments, reference being made to the attached figures, which show:

Fig. 1

the basic principle of the spray nozzle adjustment device according to the invention for two different strand widths on one side of a cast steel strand in a schematic representation in a sectional plane normal to the strand transport direction through the strand guide a continuous casting,

Fig. 2

the basic principle of the spray nozzle adjustment device according to the invention with two different strand widths on one side of a cast steel strand in a schematic representation in a partial longitudinal section through the strand guide of a continuous casting plant,

Fig. 3

Representation of the geometric change in position of a spray nozzle between adjacent strand guide rollers in a curved strand guide,

Fig. 4

the attachment of a spray nozzle to a spray nozzle holder according to a first possible embodiment,

Fig. 5

the attachment of a spray nozzle to a spray nozzle holder according to a second possible embodiment,

Fig. 6

a top view of an adjustment with spray nozzle holder,

Fig. 7

a possible embodiment of the spray nozzle adjustment device according to the invention with 3 spray nozzles in a sectional plane normal to the strand transport direction through the strand guide a continuous casting.

In the FIGS. 1 and 2 the arrangement of the spray nozzle adjusting device according to the invention in the strand guide of a continuous slab caster is shown schematically. Fig. 2 12 illustrates, in a partial longitudinal section through the continuous casting plant, the transition region from a bent section of the strand guide into a straight section of the strand guide in the outlet region of a continuous casting plant, making obvious the essential components of the spray nozzle adjustment device and their advantages in these two geometrically different positions.

A cast in a continuous casting mold, not shown metal strand 1 is supported after the exit from the continuous casting mold in a strand guide 2 of strand guide rollers 3 at the opposite broad side surfaces 1 a, 1 b and by the strand guide in strand conveying direction R of a substantially vertical casting direction in a horizontal Direction of transport deflected. Between successive in strand conveying direction strand guide rollers 3a, 3b, 3c, 3d, 3e each spray nozzles 4, 5, 6, 7, 8 are arranged, wherein in a plane normal to Strangtransportrichtung, for example, in a sectional plane in the spray nozzle 5, two spray nozzles 5a, 5b are arranged, with which fan-shaped coolant jets 9a, 9b are applied to a broad side surface 1a of the metal strand 1 that a largely even coolant is applied. If, for example, a metal strand 1 'wider than the metal strand 1 is cast, the positions of the spray nozzles 5a, 5b are adjusted according to the positions represented by the reference numerals 5a' and 5b 'in dashed lines. Thus, fan-shaped coolant jets 9a 'and 9b' are automatically adjusted, with which in turn the entire strand width can be uniformly cooled. The required amount of coolant can be regulated, for example, by an increased injection pressure to the now larger strand width. The strand guide rollers 3, 3a, 3b, 3c, 3d, 3e arranged in the strand guide 2 in two rows, of which only one row is shown, and supported in the framework 2a, form a transport path 1c for the cast metal strand.

Each spray nozzle 5a, 5b is connected to a spray nozzle holder 10, which in turn with the adjusting piston 11 of an adjusting 12, no relative movement permitting, is firmly connected. In Fig. 2 the adjusting device 12 is indicated only schematically with the actuating piston 11 by a double arrow illustrating the common possibility of movement of the actuating piston and the spray nozzle holder 10. The adjusting device 12 comprises a hydraulically or pneumatically actuable pressure cylinder 40. The spray nozzle holder 10 is, for example, in a format change from a metal strand 1 with a first widths to a metal strand 1 'with a second, for example, greater width by retracting the control piston 11 of the adjusting 12 in one Position corresponding to the spray nozzle holder 10 'brought, whereby the optimum for this casting width coolant jet is adjusted. The adjusting device 12 is attached to the frame construction of the strand guide 2 in a region which is as far as possible from the hot metal strand, thus on a support bracket 13 on the side remote from the hot metal strand 1 side of the strand guide frame construction.

The spray nozzle holders 10, 10 'extend substantially in the strand conveying direction over a longitudinal region, which comprises a plurality of successively arranged Stangangführungsrollen 3a, 3b, 3c or 3c, 3d, 3e, .... A plurality of injection nozzles 4, 5, 6 or 7, 8 arranged one after another in this respective region in the strand conveying direction are fastened to a common injection nozzle holder 10, 10 'and can be adjusted together in the case of an adjusting movement exerted on the injection nozzle holder. For the case not shown in Stahlstranggießanlagen common that the strand guide is composed of several strand guide segments, all in the strand conveying direction arranged one behind the other and attached to a extending over the longitudinal extent of the strand guide segment spray nozzle holder spray nozzles be positioned together with an adjustment of the spray nozzle holder. Thus, the piping cost of spray cooling for each segment is significantly simplified and minimizes the number of necessary adjustment to mostly two.

For very wide metal strands, especially for a strand width over 2.0 m, three adjustment devices for three spray nozzles arranged next to one another are necessary in order to ensure a uniform coolant application across the strand width.

In a straight strand guide section, as in the right half of the FIG. 2 is shown, the spray nozzles 7, 8 are moved between adjacent strand guide rollers 3c, 3d, 3e in a parallel movement away from the strand surface or towards her, wherein the central alignment of the spray nozzles is maintained between the strand guide rollers. In an arcuate strand guide portion, as in the left half of the FIG. 2 is shown, it would be due to the parallel displacement of the spray nozzles 4, 5 to the loss of the central position between the strand guide rollers to varying degrees. These relationships are in FIG. 3 shown. Due to the parallel displacement, the coolant jet would suddenly impinge directly on one of the strand guide rollers. In order to adjust the spray nozzles at any casting width-dependent position of the spray nozzle holder centered on the gap between adjacent strand guide rollers, each spray nozzle 4, 5, 6 within the arcuate strand guide with a coolant passage 15 is pivotally mounted on the spray nozzle holder 10. At the same time, the long coolant line 16, which extends transversely through the frame construction of the strand guide between the coolant passage 15 and the spray nozzle head 17, is guided in a guide element 18, which is fastened to the frame construction of the strand guide. The guide element 18 is designed as a guide fork 19 with a guide slot 19a which is open in a plane normal to the strand conveying direction. In this guide slot 19a, the coolant line 16 is slidably fixed in position and allows alignment of the spray nozzle head 17 and thus the coolant jet 9 to the middle between adjacent strand guide rollers 3a, 3b, .... By pivotally mounting the coolant passage 15 and the spray nozzle 4th , 5, ... at the spray nozzle holder 10, a bending of the spray nozzle is avoided in the region of the coolant line. The guide elements 18 are attached to the frame structure of the strand guide 2, not shown.

In order to avoid oscillating movements of the spray nozzles 16 support plates 20 are arranged in the region of cranked coolant lines, which reinforce the bending or vibration stability of the coolant lines in a plane normal to the strand conveying direction ( Fig. 1 ). In dual-fluid cooling (air mist cooling), the coolant line comprises a line for the actual coolant and a line for the atomizer. The mixture of the two components and the formation of the coolant jet 9 takes place in the spray nozzle head 17th

A possible first embodiment of the structural design of the spray nozzle holder 10 and an attachment of the spray nozzle 4 on the spray nozzle holder is in FIG. 4 shown. The spray nozzle holder 10 comprises two profile tubes 22, 23 for the supply, passage and distribution of a coolant, such as treated cooling water, and a Zerstäubermediums, preferably air, to any number of spray nozzles 4. The profile tubes 22, 23 are provided with connecting tabs 24, 25th connected to the vibration-stable spray nozzle holder. The profile tubes are laterally associated mounting strips 26, 27, 29 in the region of openings 28, mounting surfaces 30 for the tight attachment of the coolant passage 15 of the spray nozzle. The passage openings 28, 29 correspond to media lines in the spray nozzle, which are indicated by the center lines. The passage openings 28, 29 in the mounting strips 26, 27 are optionally formed as slots 32, to give rise to no cross-sectional constriction even with a pivoting movement of the spray nozzle. The spray nozzle is fastened with a connecting screw 31 on the spray nozzle holder 10. To ensure a tight connection of the components while ensuring a pivoting possibility of the spray nozzle of the connecting screw, a spring element and the through holes sealing elements can be assigned.

A second preferred embodiment for the structural design of the spray nozzle holder 10 and an attachment of the spray nozzle 4 on the spray nozzle holder is in FIG. 5 illustrated. The spray nozzle holder 10 in turn comprises two spaced apart firmly connected profile tubes 22, 23 for the supply of coolant and atomizer to the spray nozzles. On and in the profile tubes according to the number of connected spray nozzles slide bushings 33 are welded for the rotatable recording of rotary unions 34, through which the coolant and the atomizer through passages 28, 29 into the coolant passage 15 of the spray nozzle 4 is passed. The spray nozzle 4 is with its coolant passage 15 at the Mounted mounting surface 30 of the rotary feedthrough 34 and pivotally supported together with the rotary feedthrough and axially limited in the direction of the pivot axis 36 by a collar 37 in the slide bushes 33 of the spray nozzle holder 10. The passage openings 28, 29 are sealed by a plurality of sealing rings 38 in the transition region of the slide bushing for rotary feedthrough.

The basic structure of the adjusting device 12 mounted on a support bracket 13 of the frame structure of the strand guide 2 is shown in FIG FIG. 6 illustrated in more detail. The adjusting device 12 comprises a hydraulically or pneumatically actuated pressure medium cylinder 40 with an actuating piston 11 which is rigidly connected to the spray nozzle holder 10. The spray nozzle holder carries two guide elements 41 formed by guide rods, which are arranged on both sides of the actuating piston parallel to this, lying in a common plane with the actuating piston 11. The guide elements 41 pass through the base frame 42 of the adjusting and are slidable in this in the axial direction of the guide elements and perform upon actuation of the pressure medium cylinder 40 with a synchronous with the actuating piston 11 movement. The guide elements 41 are used to stabilize the spray nozzle holder 10. At the spray nozzle holder are each an elastic feed lines 43, 44 for coolant and atomizer for media supply of six spray nozzles 4, 5, 6, 7 ... connected. This ensures a substantial simplification of the coolant piping in the structurally restricted strand guide.

Fig. 7 shows the arrangement of 3 spray nozzles 5a, 5b, 5c in a direction normal to the strand conveying direction plane between adjacent strand guide rollers. While the outer, the edge regions of a slab cooling spray nozzles 5a, 5b in the already with reference to Fig. 1 described type are arranged adaptable to different strand widths, the inner, the central region of the slab cooling spray nozzle 5c is unchangeable in position. It is arranged on a permanently mounted spray nozzle holder 10. However, it is also possible that the spray nozzle holder of this centrally located spray nozzle is connected to the actuating piston of an adjusting device 12 shown in dashed lines and all 3 spray nozzles are adapted with matched adjustment movements at different strand widths.

Each adjusting device 12 are associated with control and regulating devices 45 which are connected to the system control system 46 and which comprise at least one displacement sensor and a preferably hydraulic actuator for positional determination of the spray nozzles ( Fig. 1 ). In the plant control system basic settings of the continuous casting plant are made, which are given for example by the specification of a Gießformates and the steel quality and predetermine the position of the spray nozzles in the strand guide. These default values for the positioning of the spray nozzles are approached synchronously by the control and regulating devices.

Claims (15)

1. Spray-nozzle adjusting device in a strand guide (2) of a slab continuous casting plant for the production of metal strands of different strand width, the strand guide comprising strand guide rollers (3, 3a, 3b, 3c, ...) which are supported in a scaffold frame (2a) and which form a transport path (1c) for the metal strand, and at least two spray nozzles (5a, 5b) being assigned to this transport path, in a plane lying perpendicularly to the strand conveying direction (R), between adjacent strand guide rollers succeeding one another in the strand conveying direction, by means of which spray nozzles fan-shaped coolant jets are applied to a wide side face (1a, 1b) of the metal strand, and which spray nozzles are connected in each case to an adjusting device (12) for changing the distance between the spray nozzles and for changing the perpendicular distance of the spray nozzles from the transport path, and a spray nozzle holder (10) being assigned to each spray nozzle (5a, 5b) arranged in a plane lying perpendicularly to the strand conveying direction, characterized in that the spray nozzle holder is fastened to an actuating piston (11) of at least one adjusting device (12), during an axial adjusting movement of the actuating piston, an adjusting movement of the spray nozzles, which is parallel to this axial adjusting movement, taking place, and the adjusting device (12) being fastened to the scaffold frame (2a) of the strand guide (2) in a freely accessible outer region of the strand guide, said region being remote from the transport path (1c).
2. Spray-nozzle adjusting device according to Claim 1,
   characterized in that the angle of inclination (α) of the actuating piston (11) of the adjusting device (12) to the transport path of the metal strand in a plane lying perpendicularly to the strand conveying direction corresponds to the opening angle (β) of the coolant jet (9) emerging from the spray nozzle (5a, 5b).
3. Spray-nozzle adjusting device according to one of the preceding claims, characterized in that spray nozzles (4, 5, 6, 7, 8) arranged one behind the other along the transport path, in a plurality of planes lying one behind the other in the strand conveying direction, are assigned to a spray nozzle holder (10) extending in the strand conveying direction and can be adjusted synchronously with said spray nozzle holder.
4. Spray-nozzle adjusting device according to one of the preceding claims, characterized in that the spray nozzle holder (10) is guided on the adjusting device (12) by means of at least one guide element (41).
5. Spray-nozzle adjusting device according to Claim 4,
   characterized in that the longitudinal axis of the actuating piston (11) of the adjusting device (12) and the longitudinal axes of the at least one guide element (41) are arranged in one plane, and the actuating piston (11) of the adjusting device (12) is arranged between two guide elements (41).
6. Spray-nozzle adjusting device according to one of the preceding claims, characterized in that the adjusting device (12) comprises a hydraulically or pneumatically actuable pressure medium cylinder (40).
7. Spray-nozzle adjusting device according to one of the preceding claims, characterized in that the spray nozzle comprises a coolant line (16) and a coolant lead through (15), and the coolant lead through is connected to the spray nozzle holder (10), in that the coolant line (16) is guided in a guide element (18) displaceably in a plane lying perpendicularly to the strand conveying direction, and in that the guide element (18) is fastened in a scaffold frame of the strand guide (2).
8. Spray-nozzle adjusting device according to Claim 7,
   characterized in that the guide element (18) for receiving the coolant line (16) is designed as a guide fork (19) having a guide slot (19a) open in a plane lying perpendicularly to the strand conveying direction.
9. Spray-nozzle adjusting device according to Claim 7 or 8, characterized in that the coolant lead through (15) is connected to a rotary lead through (34) and allows a pivoting movement in a plane lying parallel to the strand conveying direction.
10. Spray-nozzle adjusting device according to Claim 7,
    characterized in that the coolant line (16) is reinforced by means of a supporting plate (20) in a plane lying perpendicularly to the strand conveying direction.
11. Spray-nozzle adjusting device according to one of the preceding claims, characterized in that, when at least three spray nozzles (5a, 5b, 5c) are arranged in a plane lying perpendicularly to the strand conveying direction, the spray nozzle holders (10) of the outer spray nozzles (5a, 5b) are connected to a connecting linkage, and further spray nozzles (5c) arranged between these outer spray nozzles (5a, 5b) are suspended with their spray nozzle holders (10) on this connecting linkage.
12. Spray-nozzle adjusting device according to one of the preceding Claims 1 to 10, characterized in that, when at least three spray nozzles (5a, 5b, 5c) are arranged in a plane lying perpendicularly to the strand conveying direction, the inner spray nozzles (5c) are fastened to an unadjustably fixed spray nozzle holder (10).
13. Spray-nozzle adjusting device according to one of the preceding claims, characterized in that each adjusting device (12) is assigned regulating and control devices (45), which are connected to the plant management system (46).
14. Spray-nozzle adjusting device according to Claim 13, characterized in that, for positioning the spray nozzles (4), the adjusting device (12) comprises a hydraulic actuating member with switching valves which are activated via a three-position controller or via a pulse-width modulated controller.
15. Spray-nozzle adjusting device according to Claim 13, characterized in that, the regulating and control devices (45) are designed as a displacement transducer and a preferably hydraulic actuating member for fixing the position of the actuating piston.

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