ES2343380T3 - ADJUSTMENT DEVICE FOR SPRAY NOZZLES. - 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

Nozzle adjustment device sprayers

The present invention refers to a adjustment device for spray nozzles on a guide bar of a continuous slab casting facility for the manufacture of metal bars of different bar width, with what that the bar guide comprises bar guide rollers supported by a frame and that form a transport path for the bar metal, and at least two spray nozzles assigned to this transport route in a plane perpendicular to the direction of bar transport, between two adjacent bar guide rollers and successive in the direction of transport of the bar, with which fan-shaped coolant jets are applied on a wide lateral surface of the metal bar and in each case are attached to an adjustment device for the modification of the distance of the spray nozzles from each other and for the modification of the perpendicular distance of the nozzles sprayers to the transport track, and a nozzle holder sprayer assigned to each spray nozzle arranged in a plane perpendicular to the direction of transport of the bar.

In a continuous casting installation, the bar coming out of the shell for continuous casting, solidified at least partially in the subsequent bar guide that is generally found formed by sections of successive bar guides is subjected to intensive cooling by water projection. He cooling medium, usually water spray or a mixture of water and air, is projected in the form of a fan through sprayers and in a clearance between guide rollers of successive bar in the transport direction of the bar. As in a continuous casting installation, they are usually cast metal bars with different bar width is necessary position the handle spray nozzles such that it is achieved a uniform charge with cooling medium of the surface of the bar, in a perpendicular plane in relation to the direction of bar transport. In the case of bars with sections cross-cutting of this roughing is limited mainly to the wide side surfaces of the bar wash.

In the case of crossbar sections, when the bar width increases, two are arranged, eventually three spray nozzles next to each other to ensure an approximately uniform load on the wide lateral surface of a roughing, and to ensure a possible cooling even of the metal bar. A non-uniform cooling leads to the formation of cracks in the roughing, especially in the area of the surface and the songs

Therefore, to guarantee an application coolant uniform it is already customary to have adjustment devices  for the modification of the distance of the nozzles sprayers, arranged in a perpendicular plane in relationship with the direction of transport of the bar, and of the perpendicular distance of the spray nozzles to the metal bar surface. In this way, it is intended to avoid an unwanted overlap of spray fans adjacent spray nozzles and a projection above The songs of roughing.

From DE 25 07 971 A1, a nozzle adjustment device in which multiple nozzles sprayers are articulated in a lever system, for example in the form of a parallel crank system. At Execution example described with three spray nozzles arranged in a plane, an adjustment of this lever system causes the formation of three spray fans, which in each roughing width chosen can be adjusted from one position operating to another operating position, with an area of constant and unsprayed overlapping over the edge of the roughing. To do this, an adjustment spindle moves a Lever mechanism element in the desired direction.

From DE 26 36 666 B1 it is also known a nozzle adjustment device formed by multiple systems of parallel connecting rods, so that each of these systems of parallel cranks it carries a spray nozzle, and through a manual wheel the complete system can be adjusted from a operating position towards another operating position of according to the chosen roughing width.

Similar nozzle adjustment devices for different bar formats they are already known, in addition, of the DE 30 39 443 A1, DE 32 07 668 A1 and EP 0 028 686 A1.

Within the bar guide, the devices Nozzle adjustment work within walking distance of the metal bar hot, within an area with high thermal load, and additionally they are subject to great dirt, so that the articulated joints of these complex kinematic chains are prone to failures in its functionality. Additionally, you are moving parts in the bar guide elements or segments are found in hard-to-reach areas, so it is not easy make repairs

It is therefore object of the present invention avoid the disadvantages described above and propose a device for spray nozzle adjustment characterized by a Simple maintenance and good access.

Based on an adjustment device for spray nozzles of the aforementioned type, the object is solved because the spray nozzle holder is located attached to an adjustment piston of at least one device adjustment, so in the case of an axial adjustment movement of the adjustment piston takes place a nozzle adjustment movement which is parallel to the axial adjustment movement, and the device of adjustment is fixed to the bar guide frame in one area external access and away from the transport route of the bar guide In this way, all adjustment devices and control are positioned in an area away from loads thermal. A stable provision in the case of the conditions of described operation is guaranteed through a joint that does not admit any relative movement between the adjusting piston and the spray nozzle holder.

To ensure optimal distribution of refrigerant along the bar width adjusted in each case and at all possible bar widths, it is convenient that the angle tilt of the adjusting piston of the adjusting device, in relationship with the intended surface of the transport route, correspond, in a plane perpendicular to the direction of transport from the bar, to the opening angle of the refrigerant jet that comes out of the spray nozzle. Also the opening angle of Coolant jet is in that plane. In this case, the opening angle of the refrigerant jet leaving the spray nozzle, and with it the nozzle design sprayer, should be determined in such a way that the pressure of spray, depending on the distance of the nozzle sprayer towards the surface of the metal bar, of the jet of coolant that hits the bar surface not vary too much. The opening angle and the distance of the nozzle opening towards the surface of the bar influences on the application of refrigerant and, with it, the capacity of cooling on the surface of the bar.

Water is used as a cooling medium prepared refrigerant (water cooling) or cooling water sprayed together with a spray agent, preferably air (air-water combination cooling atomized).

The amount of the necessary adjustment devices along the bar guide. This can be achieved, if spray nozzles arranged a behind another along the transport route and in multiple planes one behind the other in the direction of transport of the bar, They are assigned to a spray nozzle holder, which extends in the direction of transport of the bar, and they can be adjusted synchronously with the nozzle holder sprayer mentioned.

To avoid oscillations in the support of the spray nozzle and for general stabilization, the support spray nozzle is driven into the adjustment device with at least one guiding element. Conveniently, the shaft length of the adjusting piston of the adjusting device and the longitudinal axes of at least one guide element are located arranged in a plane, and the adjustment piston of the device adjustment is preferably arranged between two elements guide.

Preferably, the adjustment device it comprises a cylinder driven by a pressure means that can Be operated hydraulically or pneumatically.

In addition to the nozzle body itself, in which spraying of the pulverized medium takes place and in whose outlet opening conforms the spray fan, the nozzle sprayer comprises a refrigerant conduit and a passage of refrigerant, so that the refrigerant passage is connected to the spray nozzle holder, and the duct coolant is scrollable in a guide element (18) and in a perpendicular plane in relation to the direction of transport of the bar, and the guide element is fixed in a rod guide roller support structure in the frame of this rod guide roller support structure. At case of binary cooling, the refrigerant line it comprises both a conduit for the cooling water and also a conduit for the spray agent.

To ensure easy assembly and disassembly of the adjusting device and / or of the spray nozzle, the guide element for the coolant duct housing is It is shaped as a guide fork, with a guide groove open in a perpendicular plane in relation to the direction of bar transport. The guide element may be formed of adjustable way to enable exact positioning of the spray nozzles between rod guide rollers successive

To be able to also fix in the area of the installation, with a curved roller support structure of Multiple bar guide, spray nozzles arranged one behind another in the direction of transport of the bar in a common spray nozzle holder and simultaneously ensure a defined positioning of the spray fan between the bar guide rollers, the coolant passage is located shaped as a rotating passage that allows a pivoting movement in a perpendicular plane in relation to the direction of bar transport.

To avoid natural oscillations of long spray nozzles and oscillations that are caused by the recoil forces of the refrigerant jet coming out of the nozzle openings, the refrigerant conduit is located reinforced with a support plate in a perpendicular plane in relationship with the transport direction of the bar.

In the case of excessively wide slabs it is it is convenient to have more than two spray nozzles one at side of another. In the case of a provision of at least three spray nozzles in a plane perpendicular to the direction bar transport, spray nozzle holders of the external spray nozzles are connected with connecting rods, and other spray nozzles arranged between these external spray nozzles are suspended with their spray nozzle holders from these connecting rods.

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A simple form of execution in your construction is that in the case of a provision of, at minus 3 spray nozzles in a plane perpendicular to the bar transport direction, spray nozzles interiors are fixed on a nozzle holder sprayer not adjustable and fixed.

For automatic adjustment of positions of nozzles to the current widths of roughing, to each device adjustment devices are assigned regulation devices and control, especially a displacement transducer and a adjustment element, preferably hydraulic, for determination of the position of the adjusting piston, and these regulation and control devices are connected to the installation control system.

Preferably, the adjustment device for the positioning of the spray nozzles comprises a hydraulic adjustment element with control valves that are operated by a three-point regulator or by a pulse width modulator.

Other advantages and features of this invention result from the following description of examples of non-limiting execution, with reference to the Attached figures, which show the following:

Fig. 1, the basic principle of the device adjustment for spray nozzles according to the invention for two different bar widths on one side of a steel bar casting, in a schematic representation on a cutting plane perpendicular in relation to the direction of transport of the bar through the bar guide of a laundry facility keep going,

Fig. 2, the basic principle of the device adjustment for spray nozzles according to the invention in the case of two different bar widths on one side of a bar cast steel, in a schematic representation in a cut partial longitudinal through the bar guide of an installation continuous casting,

Fig. 3, a representation of the modification geometric position of a spray nozzle between Adjacent bar guide rollers in a curved bar guide,

Fig. 4, fixing a nozzle sprayer in a spray nozzle holder according to a first possible form of execution,

Fig. 5, fixing a nozzle sprayer in a spray nozzle holder according to a second possible form of execution,

Fig. 6, a top view of a device adjustment with spray nozzle holder,

Fig. 7, a possible embodiment of the adjustment device for spray nozzles according to the invention with 3 spray nozzles in a cutting plane perpendicular in relation to the transport direction of the bar through the bar guide of a laundry facility keep going.

In figures 1 and 2 it is represented schematically the arrangement of the adjustment device for spray nozzles according to the invention in the rod guide of a continuous slab casting facility. Fig. 2 represents, in a partial longitudinal section through the continuous casting installation, the transition area of a curved section of the bar guide towards a straight section of the guide  bar in the outlet area of a laundry facility continue, with the help of which the components are revealed Essential adjustment device for spray nozzles and its advantages in these two positions of different geometry.

A metal bar 1, cast in a shell for continuous casting not shown, it is supported on the surfaces wide sides opposite each other 1a, 1b after the exit of the Continuous casting nozzle on a roller guide 2 of rollers bar guide 3, and is deflected by the bar guide in the direction of transport of the bar R from a casting direction essentially vertical towards a horizontal transport direction.  Between the successive rod guide rollers in the direction of bar transport 3a, 3b, 3c, 3d, 3e are arranged, in each case, spray nozzles 4, 5, 6, 7, 8, so that a perpendicular plane in relation to the direction of transport of the bar, for example in a cutting plane in the area of the spray nozzle 5, two nozzles are arranged sprayers 5a, 5b, with which jets of fan-shaped refrigerant 9a, 9b on a side surface width 1a of the metal bar 1, such that a Very uniform refrigerant application. When a bar is cast 1 'wider metal compared to 1 metal bar, it has place an adaptation of the nozzle positions sprayers 5a, 5b that correspond to the positions represented by the references of dotted lines 5a 'and 5b'. From this way, coolant jets are automatically adjusted in fan shape 9a 'and 9b', with which in turn it can be evenly cooled the entire width of the bar. The amount of refrigerant needed can be regulated to the width of now greater bar, for example, through a higher pressure of projection. The guide bar rollers 3, 3a, 3b, 3c, 3d, 3e arranged in the 2-row bar guide (of which only a row is represented) and supported on the 2nd frame they form a transport path 1c for the cast metal bar.

Each spray nozzle 5a, 5b is located connected to a spray nozzle holder 10, which in turn is fixedly connected with the adjusting piston 11 of a adjustment device 12, without admitting relative movement. In the fig. 2 the adjustment device 12 with the adjustment piston 11 only It is indicated schematically by a double arrow, which represents the possibility of joint movement of the plunger adjustment and spray nozzle holder 10. The device of adjustment 12 comprises a cylinder operated by means of pressure 40 that can be operated hydraulically or pneumatically. For example, in the case of a format change of a bar metal 1 with a first width to a metal bar 1 'with a second width, for example, larger, the spray nozzle holder 10 is carried, by retracting the adjusting piston 11 of the adjusting device 12, at a position corresponding to the support 10 'spray nozzle, which adjusts the jet of Optimum refrigerant for this laundry width. The device of setting 12 is fixed in the frame construction of the guide bar 2 in an area where possible well away from the metal bar hot, that is, on a support console 13 on the side of the construction of the bar guide frame away from the metal bar hot 1.

The spray nozzle holders 10, 10 ' they extend essentially in the direction of transport of the bar along a longitudinal area comprising multiple bar guide rollers arranged one behind the other 3a, 3b, 3c or 3c, 3d, 3e, ... In this respective area, multiple nozzles sprayers 4, 5, 6 or 7, 8 are attached one behind another in the direction of transport of the bar in a support of 10, 10 'common spray nozzle and in the case of a movement adjustment exercised on the spray nozzle holder can be adjusted together. For that matter, usual in continuous casting facilities, not shown in detail, in the that the bar guide is made up of multiple bar guide segments, all spray nozzles arranged one behind the other in the direction of transport of the bar and fixed on a spray nozzle holder that extends along the bar guide segment can be positioned together with an adjustment movement of the spray nozzle holder. In this way, the complexity of the assembly of water projection cooling pipes is significantly simplified for each segment and the amount of the necessary adjustment devices is minimized to, generally two.

In the case of metal bars especially wide, especially in the case of a bar width greater than 2.0 m, to ensure uniform application over the width of the three adjustment devices are necessary for three spray nozzles arranged side by side.

In the case of a bar guide section straight, like the one represented in the right half of the image of figure 2, the spray nozzles 7, 8 between adjacent bar guide rollers 3c, 3d, 3e are displaced from jointly and in a parallel movement to move them away or bring them closer to the surface of the bar, bringing the alignment center of the spray nozzles between the guide rollers Bar is preserved. In the case of a bar guide section in arc shape, like the one represented in the middle left of the image in figure 2, with the offset parallel to the spray nozzles 4, 5 the center position between bar guide rollers in different measure. These relationships are represented in Figure 3. Through the parallel displacement the refrigerant jet suddenly it would directly affect one of the rollers of bar guide To be able to adjust the spray nozzles on all positions dependent on the casting width so central in the groove between adjacent bar guide rollers, inside the arc-shaped bar guide each nozzle sprayer 4, 5, 6 is pivotally fixed in the bar guide support 10 with a coolant passage. Simultaneously, the long refrigerant line 16, which is extends transversely through the frame construction of the rod guide between the coolant passage 15 and the head of spray nozzle 17, is conducted in a guide element 18 which It is fixed in the frame construction of the bar guide. The guide element 18 is shaped as a guide fork 19 with an open guide groove 19a in a perpendicular plane in relationship with the transport direction of the bar. In this slot guide 19a the refrigerant conduit 16 is fixed of movable way in its position, and allows an orientation of the spray nozzle head 17 and thereby the jet of coolant 9 over the center, between bar guide rollers adjacent 3a, 3b, .... By pivotally fixing the passage of coolant 15 or spray nozzle 4, 5, ... in the spray nozzle holder 10 prevents the nozzle sprayer bends in the area of the refrigerant duct. The guide elements 18 are fixed in the frame construction of bar guide 2, not shown in detail.

To avoid oscillation movements of the spray nozzles, in the area of the ducts of coolant angled 16, support plates are arranged 20 that reinforce stability against bending or oscillations of the refrigerant ducts (fig. 1) in a perpendicular plane in relationship with the transport direction of the bar. In the case of binary cooling (combination cooling atomized air-water), the refrigerant line it comprises a conduit for the cooling agent itself and a duct for the spray agent. The mixture of both components and conformation of the refrigerant jet 9 is performs on the spray nozzle head 17.

A first preferred form of execution for the constructive design of the spray nozzle holder 10 and of a fixing of the spray nozzle 4 in the support of spray nozzle is represented in figure 4. In spray nozzle holder 10 comprises two profile tubes 22, 23 for the feeding, passage and distribution of a medium refrigerant, such as prepared cooling water, and an agent sprayer, preferably air, towards an amount any of spray nozzles 4. Profile tubes 22, 23 are joined through connecting flanges 24, 25 with the oscillation resistant spray nozzle holder. To the profile tubes are assigned laterally slats of assembly 26, 27 which in the area of passage openings 28, 29 have mounting surfaces 30 for hermetic fixing of the passage of coolant 15 of the spray nozzle. The passage openings 28, 29 correspond to medium ducts in the nozzle sprayer, which are indicated by their central lines. The passage openings 28, 29 in the mounting slats 26, 27 eventually they are shaped as elongated holes 32 so as not to let a section reduction occur transverse even in the case of a swing movement of the spray nozzle The spray nozzle is located fixed to the spray nozzle holder 10 by means of a screw of union 31. To ensure a tight connection of the components,  and at the same time guarantee a possibility of pivoting the nozzle sprayer, the connecting screw can be assigned an element Tensioner and passage openings sealing elements.

A second preferred form of execution for the constructive design of the spray nozzle holder 10 and of a fixing of the spray nozzle 4 in the support of spray nozzle is represented in figure 5. The spray nozzle holder 10 in turn comprises two tubes of profile 22, 23, fixedly connected to each other, for food of coolant and spray agent towards the nozzles sprayers According to the quantity of the nozzles connected sprayers, in and inside the profile tubes are soldiers find sliding bushes 33 for the rotating housing of rotating passages 34, through the which coolant and spray agent are conducted to through passage openings 28, 29 towards the refrigerant passage 15 of the spray nozzle 4. The spray nozzle 4, together with its coolant passage 15, it is screwed so fixed to the mounting surface 30 of the rotating passage 34 and together with the rotating passage it is pivotally supported, and in direction of the pivot shaft 36, in the sliding bushes 33 of the spray nozzle holder 33, axially limited by an adjustment ring 37. In the transition area of the bushing of sliding towards the rotating passage the openings of passage 28, 29 are sealed through multiple rings shutters 38.

The schematic construction of the device setting 12 fixed on a support console 13 of the construction bar guide frame 2 is represented with more detail in figure 6. The adjustment device 12 comprises a cylinder operated by a pressure means 40, operable in shape hydraulic or pneumatic and with an adjustment piston 11 that is statically connected with the nozzle holder sprayer 10. The spray nozzle holder carries two guide elements 41 formed by two guide rods that meet arranged on both sides of the adjustment piston and parallel to it, in the same plane with the adjustment piston 11. The guide elements 41 they pass through the base frame 42 of the adjustment device and can be displaced therein in the axial direction of the elements guide, and in the case of the cylinder drive driven by a pressure means 40 perform a synchronous movement with the plunger of adjustment 11. Guide elements 41 are used for stabilization from the spray nozzle holder 10. To the nozzle holder sprayer are connected, in each case, a conduit elastic feed 43, 44 for cooling medium and for spraying agent for feeding with said means of six spray nozzles 4, 5, 6, 7 .... This way it guarantees considerable simplification of pipe assembly for cooling medium in the construction bar guide narrow.

Fig. 7 shows the arrangement of 3 nozzles sprayers 5a, 5b, 5c in a perpendicular plane in relation to the direction of transport of the bar, between guide rollers of adjacent bar. While the spray nozzles 5a, 5b exteriors, which cool the edge areas of a roughing, are are arranged so that they may be suitable for different bar widths in the manner described in relation to the fig. 1, the position of the central spray nozzle 5c, which it cools the central area of the roughing, it cannot be modified. Be is arranged in a mounted spray nozzle holder fixedly 10. However, it is also possible that the support of spray nozzle of this spray nozzle arranged in the center is connected to the adjustment piston of a adjustment device 12, represented by dotted line, and that the 3 spray nozzles are suitable for different widths of bar with adjustment movements coordinated with each other.

To each adjustment device 12 are found assigned regulation and control devices 45 found connected to the installation control system 46 and that they comprise at least one displacement transducer and a adjustment element, preferably hydraulic, for determination of the position of the spray nozzles (fig. one). Adjustments are made in the installation control system Basics of continuous casting installation, found preset, for example, by default of a format casting and steel quality and predetermining position of the spray nozzles on the bar guide. This values preset for the positioning of the nozzles sprayers are reached synchronously by regulation and control devices.

Claims (15)

1. Adjustment device for spray nozzles on a bar guide (2) of a continuous slab casting installation for the manufacture of metal bars of different bar width, where the bar guide comprises bar guide rollers (3 , 3a, 3b, 3c, ...) that are supported on a frame (2a) and that form a transport path (1c) for the metal bar, and at least two spray nozzles (5a, 5b), assigned to this transport path in a plane perpendicular to the bar transport direction (R), between two adjacent and successive bar guide rollers in the bar transport direction, with which coolant jets are applied in the form of fan on a wide lateral surface (1a, 1b) of the metal bar, and those in each case are attached to an adjustment device (12) for the modification of the distance of the spray nozzles from each other and for the perpendicular distance modification r of the spray nozzles to the transport path, and a spray nozzle holder (10) assigned to each spray nozzle (5a, 5b) arranged in a plane perpendicular to the direction of transport of the bar, characterized in that the nozzle holder sprayer is fixed to an adjustment piston (11) of at least one adjustment device (12), whereby in the case of an axial adjustment movement of the adjustment piston a nozzle adjustment movement takes place which it is parallel to the axial adjustment movement and the adjustment device (12) is fixed to the frame (2a) of the bar guide (2) in an external area, freely accessible and away from the transport path (1c) of The bar guide. 2. Adjustment device for spray nozzles according to claim 1, characterized in that the angle of inclination (α) of the adjustment piston (11) of the adjustment device (12) in relation to the transport path of the metal bar , in a plane perpendicular to the direction of transport of the bar, corresponds to the opening angle (?) of the coolant jet (9) leaving the spray nozzle (5a, 5b). 3. Adjustment device for spray nozzles 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, and in multiple planes one behind each other in the direction of transport of the bar, they are assigned to a spray nozzle holder (10), which extends in the direction of transport of the bar, and which can be synchronously adjusted with the mentioned spray nozzle holder . 4. Adjustment device for spray nozzles according to one of the preceding claims, characterized in that the spray nozzle holder (10) is driven into the adjustment device (12) by means of at least one guide element (41). 5. Adjustment device for spray nozzles according to claim 4, characterized in that the longitudinal axis of the adjustment piston (11) of the adjustment device (12) and the longitudinal axes of at least one guide element (41) are located arranged in a plane, and the adjustment piston (11) of the adjustment device (12) is arranged between two guide elements (41). 6. Adjustment device for spray nozzles according to one of the preceding claims, characterized in that the adjustment device (12) comprises a cylinder driven by a pressure means (40) that can be hydraulically or pneumatically operated. 7. Adjustment device for spray nozzles according to one of the preceding claims, characterized in that the spray nozzle comprises a refrigerant passage (16) and a refrigerant passage (15) and the refrigerant passage is connected to the spray nozzle holder (10), and because the refrigerant conduit (16) is movably driven in a guide element (18) and in a perpendicular plane in relation to the direction of transport of the bar, and because the guide element (18) is It is fixed in a frame of the bar guide (2). 8. Adjustment device for spray nozzles according to claim 7, characterized in that the guide element (18) for housing the refrigerant duct (16) is formed as a guide fork
(19) with a guide groove (19a) open in a perpendicular plane in relation to the direction of transport of the bar. 9. Adjusting device for spray nozzles according to claim 7 or 8, characterized in that the refrigerant passage (15) is connected to a rotating passage (34) and admits a pivoting movement in a perpendicular plane in relation to the direction of bar transport. 10. Adjusting device for spray nozzles according to claim 7, characterized in that the refrigerant line (16) is reinforced with a support plate (20) in a perpendicular plane in relation to the direction of transport of the bar. 11. Adjusting device for spray nozzles according to one of the preceding claims, characterized in that in the case of an arrangement of at least three spray nozzles (5a, 5b, 5c) in a plane perpendicular to the direction of transport of the bar, the spray nozzle holders (10) of the external spray nozzles (5a, 5b) are connected with a connecting rod, and additional spray nozzles (5c) arranged between these external spray nozzles (5a, 5b) are suspended with their spray nozzle holders (10) from these connecting rods. 12. Adjustment device for spray nozzles according to one of the preceding claims 1 to 10, characterized in that in the case of an arrangement of at least three spray nozzles (5a, 5b, 5c) in a plane perpendicular to the transport direction of the bar, the internal spray nozzles (5c) are fixed on a non-adjustable and fixed spray nozzle holder (10). 13. Adjustment device for spray nozzles according to one of the preceding claims, characterized in that regulation and control devices (45) are assigned to each adjustment device (45) that are connected to the installation control system (46). ). 14. Adjustment device for spray nozzles according to claim 13, characterized in that the adjustment device (12) for positioning the spray nozzles (4) comprises a hydraulic adjustment element with control valves that are actuated by a regulator of three points or by a pulse width modulator. 15. Adjustment device for spray nozzles according to claim 13, characterized in that the regulation and control devices (45) are formed as a displacement transducer and an adjustment element, preferably hydraulic, for the determination of the piston position of adjustment.