JPWO2020038558A5 - - Google Patents

Description

The invention relates to an apparatus and method for descaling, in particular for descaling surfaces with a liquid sprayed from a rotary nozzle head, such as in rolling mills for the production of steel strip or strip of non-ferrous metals. relating to the method.

Systems and methods for removing scale from rolling stock, such as thin rolled steel, by spraying it with high-pressure water from rotating nozzles are known from US 5,502,881 and US 2007/0277358 A1. . In the technique described there, the rolling stock moves past a linear array of nozzle heads that extend across the width of the rolling stock . Each nozzle head in the array is mounted for rotation and has a plurality of nozzles arranged along the circumference of the nozzle head. Each nozzle in the nozzle head sprays a liquid, such as water, under high pressure onto the rolled material, thereby removing any scale that may have formed on the rolled material .

FIG. 1 is a schematic top view of a spray pattern produced by a nozzle head according to the state of the art. Each rotating nozzle produces a circular spray pattern on the surface of the rolling stock 100 . The superimposed spray pattern is a spiral 102 as the rolled material 100 moves in a linear direction (indicated by arrow F in FIG. 1) under the rotating nozzle head. As can be seen in FIG. 1, the spirals from each nozzle overlap and overlap at the border regions. In the spray pattern 102, this overlap can result in strips 104, 104' along the direction of travel F of the rolling material 100 around the circle.

For ease of presentation, FIG. 1 shows the spray pattern 102 of only a single nozzle head, which may comprise one or multiple nozzles. However, in many applications multiple spray heads can be arranged in a row or array across the width of the rolled material 100 (perpendicular to direction F), all of these nozzle heads being shown in FIG. resulting in a spiral spray pattern 102 bounded by strips 104, 104' that are the same or very similar to those on the right.

In the overlapping areas indicated by the strips 104, 104', more liquid acts under pressure on the rolling material 100 than in the surrounding areas, which may cause undesirable non-uniformities or even descaling marks on the rolling material 100. can also result.

Accordingly, there is a need for apparatus and methods that enable more uniform and uniform descaling of rolled material .

This object is achieved by a nozzle head for descaling rolled material according to independent claim 1 and a method for descaling rolled material according to independent claim 12 . The dependent claims refer to preferred embodiments.

A nozzle head for descaling a rolled stock according to the invention, wherein the nozzle head with which the rolled stock moves relative to the nozzle head is rotated about an axis of rotation relative to the surface of the rolled stock . and comprising a plurality of nozzles adapted to spray a liquid onto said rolled material , said nozzles being arranged at various different radial distances from said axis of rotation.

Moving the nozzle away from the circumference of the rotating nozzle head may appear counter-intuitive and counterproductive to those skilled in the art, as it reduces the range and angular momentum of the liquid it ejects. However, it is the inventor's insight that nozzles positioned at various radial distances from said axis of rotation may provide a more even and more homogeneous spray pattern across the rolled material , thereby providing improved descaling results. is.

Especially given that the spray pattern is more uniform, undesirable descaling marks on the rolled material can be effectively avoided.

Additionally, given the more uniform spray pattern, less liquid uptake or lower liquid pressures can be used to achieve the desired descaling results more efficiently and at lower cost.

The techniques of the present invention can be employed for hot and cold descaling of a wide variety of workpieces or materials , including steel or other ferrous metals and non-ferrous metals such as aluminum, brass or copper.

The technique of the present invention can replace inferior methods of descaling for non-ferrous metals such as chemical descaling, especially etching, or descaling by brush.

The technique according to the invention is versatile and can be employed with materials of any shape or size.

Material , in the sense of this disclosure, may refer to any object requiring descaling, including objects of various material compositions, sizes or shapes.

For example, the material may include steel strip or non-ferrous metal strip, such as hot or cold slabs, plates or other wide steel products. Additionally, materials may include blooms, bars, profiles, round bars, pipes or wires, as well as blooms from ingots and ingot mold castings.

The material can be formed in the forging mill in all kinds of shapes, including rings.

Rotation, in the sense of this disclosure, may relate to circular or elliptical motion, or any other kind of motion in which the nozzle head rotates relative to the surface of the rolled material .

An axis of rotation in the sense of this disclosure may refer to an axis perpendicular to the plane of rotation. The axis of rotation may coincide with the drive axis of the nozzle head. However, this is optional and the axis of rotation can also be a virtual axis defined only by the rotational movement of the nozzle head.

Rolled material in the sense of this disclosure refers to material that moves relative to said nozzle head. For example, the nozzle head may be stationary and the material may move linearly relative to the nozzle head. In other embodiments, the material may be stationary and the nozzle head may move across the rolled material in addition to the rotation of the nozzle head relative to the surface. In other embodiments, both the material and nozzle head may move relative to a stationary frame of reference.

In one embodiment, the nozzle head includes at least a first nozzle positioned at a first radial distance from the axis of rotation and a second nozzle positioned at a second radial distance from the axis of rotation; The second distance is less than the first distance.

In particular, the second nozzle is arranged away from the peripheral edge of the nozzle head.

The inventors have found that placing the second nozzle at a smaller distance from the axis of rotation may lead to more uniform descaling and may avoid descaling strips.

The radial distance between adjacent nozzles can be selected such that corresponding spray patterns slightly overlap or touch each other on the surface of the rolled material . This may make it possible to achieve a particularly homogeneous descaling of the rolled material .

In general, the radial distance between adjacent nozzles can depend both on the distance between the nozzle head and the surface of the rolled material and on the jet opening angle or spray angle of the respective nozzle.

In general, the greater the nozzle height above the surface of the rolling material and the greater the exit opening angle of the jets issuing from the nozzles, the greater the radial distance between adjacent nozzle heads can be chosen. .

In a non-limiting example, said second radial distance amounts to at most 0.9 times said first radial distance, in particular at most 0.8 times said first radial distance.

In one embodiment, the plurality of nozzles are arranged along a circle or ellipse with varying radii.

The radius can be measured from the axis of rotation.

For example, the nozzle head may include a first group of at least one nozzle arranged at a first radius and a second group of at least one nozzle arranged at a second radius; The radius is smaller than the first radius.

In general, each of said first group of nozzles and/or said second group of nozzles may comprise any number of nozzles.

According to an example, the number of nozzles in the first group of nozzles and/or the number of nozzles in the second group of nozzles is at least two.

In an embodiment, the number of nozzles of said second group of nozzles may not be greater than the number of nozzles of said first group of nozzles, in particular less than the number of nozzles of said first group of nozzles. .

Larger diameter nozzles typically sweep across a larger surface area to descale. Therefore, by varying the number of nozzles depending on the diameter, more uniform descaling can be achieved over the entire surface of the rolled material .

In one embodiment, the second radius may be at most 0.9 times the first radius, in particular at most 0.8 times the first radius.

The invention is not limited to nozzles arranged along two circles or ellipses, but may include nozzles at any number of distances from said axis of rotation.

For example, the nozzle head may include a third group of at least one nozzle arranged at a third radius, the third radius being less than the second radius.

The third group of nozzles may contain any number of nozzles.

The number of nozzles of said third group of nozzles may not be greater than the number of nozzles of said second group of nozzles, in particular it may be less than the number of nozzles of said second group of nozzles.

According to an example, the number of nozzles in said third group of nozzles may be at least two.

In one embodiment, said third radius is at most 0.8 times said first radius, in particular at most 0.7 times said first radius.

According to one embodiment, said nozzles may be angled radially outward.

The inventors have discovered that radial tilting of the nozzle can extend the range of the spray pattern and can lead to more uniform descaling.

In one embodiment, the outward tilt angle can reach at least 1° or at least 5°, in particular at least 10°.

In one embodiment, said outward inclination angle is at most 40°, or at most 30°, or at most 20°, or at most 15°, in particular at most 10°.

Nozzles at different radial distances from the axis of rotation may have different outward tilt angles.

In one embodiment, said nozzle head is arranged at a first radial distance from said axis of rotation, said first nozzle slanting radially outward at a first outward inclination angle; a second nozzle positioned a second radial distance from the axis of rotation, the second nozzle slanting radially outwardly at a second outward tilt angle, wherein the second radial distance is the Less than the first radial distance, the second outward tilt angle is different from the first outward tilt angle.

The second outward inclination angle may be greater or smaller than the first outward inclination angle.

By varying the outward tilt angle with the radial distance of the corresponding nozzle from the axis of rotation, more uniform descaling can be achieved.

In some examples, the second outward tilt angle may be zero or essentially zero.

In these examples, only the nozzles located at the maximum radial distance may be tilted outward.

Alternatively or additionally, the nozzles may be slanted in the circumferential direction of the nozzle head.

In one embodiment, the nozzles may be tilted in or along the direction of rotation of the nozzle head.

Alternatively, the nozzles may be slanted against the direction of rotation of the nozzle head.

In one example, the circumferential tilt angle may be at least 5°, in particular at least 10°. In some examples, the circumferential tilt angle may range from 3° to 20° and may be adjusted depending on the rotational speed of the nozzle head.

In one embodiment, the circumferential tilt angle can reach up to 50°, in particular up to 40° or up to 20°.

Again, a more uniform spray pattern can be achieved by varying the circumferential tilt angle depending on the radial distance of the corresponding nozzle from the axis of rotation.

In one embodiment, said nozzle head is arranged at a first radial distance from said axis of rotation, said first nozzle slanting radially outward at a first outward inclination angle; a second nozzle positioned a second radial distance from the axis of rotation, the second nozzle slanted radially outward at a second outward tilt angle, the second radial distance being the The second circumferential tilt angle is less than the first radial distance and is different than the first circumferential tilt angle.

In one example, the second circumferential tilt angle may be smaller than the first circumferential tilt angle.

Alternatively, the second peripheral inclination angle may be greater than the first peripheral inclination angle.

The uniformity of the spray pattern is also improved by varying the amount of liquid sprayed from the nozzle at different radial distances, such as by varying the fluid pressure and/or varying the orifice size of the nozzle. can be

In one embodiment, said nozzle head comprises a first nozzle having a first orifice size located a first radial distance from said axis of rotation and a second radial distance from said axis of rotation. and said second nozzle having a second orifice size, said second radial distance being less than said first radial distance, said second orifice size being: Different from said first orifice size, in particular smaller or larger than said first orifice size.

The orifice size can be related to the orifice diameter.

In some embodiments, the orifice of the nozzle can have a circular cross-section. In other embodiments, the orifice may be oval in cross-section. In still other embodiments, the orifice may be slit-shaped.

The invention also relates to an apparatus for descaling a rolled stock comprising a nozzle head having some or all of the above characteristics, said nozzle head being rotated about said axis of rotation with respect to said surface of said rolled stock . mounted for rotation.

The apparatus may further comprise a drive unit adapted to rotate the nozzle head around the axis of rotation.

In one embodiment, the device further comprises a supply unit adapted to supply the liquid to the nozzle head.

The invention has thus far been described with respect to a single nozzle head. However, as explained in the background section, in practice descaling machines often include a plurality of nozzle heads arranged in an array across the width of the rolled material .

The invention therefore also relates to an apparatus for descaling rolled material comprising a plurality of nozzle heads with some or all of the above characteristics.

In one example, the nozzle heads may be arranged vertically and/or horizontally across the width of the rolling stock , in particular across the width of the rolling stock.

In some examples, said nozzle heads may be arranged in at least one row, in particular in a plurality of staggered rows.

A staggered configuration can be particularly advantageous if nozzle heads are provided on several surface sides of the rolling stock, in order to prevent the injected jets of liquid from interfering.

In some examples, the nozzle heads are arranged in a circle across the rolled material .

Other shapes can be used as well, depending on the type and shape of the rolled material .

For example, the nozzle heads may be arranged in several different rows and the different rows may be formed at an angle with respect to each other. If the rolling stock includes bars or blooms, different rows of nozzle heads may be arranged to descale the side faces of the rolling stock .

If the rolled stock comprises rods or tubes of circular cross-section, the nozzle heads may be arranged in a star configuration.

Adjacent nozzle heads may be counter-propagating.

A feature of the nozzle head comprises a plurality of nozzles at various distances from the axis of rotation, their respective outward and circumferential inclination angles being in particular the rows of the nozzle head across the width of the rolled stock . may vary between the plurality of nozzle heads depending on the position of the .

For example, the border or edge nozzle heads of the rolled material may comprise fewer nozzles than the central nozzle heads, particularly fewer nozzles along the outermost periphery of each nozzle head.

In one example, the apparatus comprises first and second nozzle heads, particularly arranged in rows across the width of the rolled material , said first and second nozzle heads having the features described above. wherein said first nozzle head is mounted for rotation about a first axis of rotation with respect to the surface of said rolled material , said first nozzle head displacing said liquid a plurality of first nozzles adapted to spray the rolled material , the plurality of first nozzles being arranged at a first radius and a first group of at least one nozzle being arranged at a second radius; and a second group of at least one nozzle, wherein the second radius is less than the first radius.

Similarly, the second nozzle head may be mounted for rotation about a second axis of rotation with respect to the surface of the rolling stock , the second nozzle head spraying the liquid onto the rolling stock. a plurality of second nozzles adapted to. The plurality of second nozzles includes a first group of at least one nozzle arranged at a first radius and a second group of at least one nozzle arranged at a second radius, the second radius being the smaller than the first radius.

Said first nozzle head may be arranged closer to a border or edge of said rolling stock than said second nozzle head, wherein said first group of nozzles of said first nozzle head is arranged closer to said second comprises fewer nozzles than said first group of nozzles of a nozzle head and/or said first group of nozzles of said first nozzle head has smaller orifices than said first group of nozzles of said second nozzle head Including size nozzle.

The surface area of the rolled stock that the first nozzle head has to descale near the boundaries or edges of the rolled stock may be less than the surface area descaled toward the center of the rolled stock by the nozzle head. . By adapting the size of the nozzles or their number accordingly, more uniform descaling can be achieved and waste of descaling liquid or other resources can be avoided.

The invention further comprises the step of rotating a nozzle head about an axis of rotation relative to the surface of the rolling stock , the nozzle head comprising a plurality of nozzles, and the pressure from the nozzles onto the rolling stock. and spraying a liquid, wherein said nozzles are arranged at different radial distances from said axis of rotation.

The method may further comprise moving the rolled material and the nozzle head relative to each other.

The nozzle head may be a nozzle head with some or all of the features described above.

The rolled material can be a heated or unheated metallic material , in particular a non-ferrous metallic material .

In one embodiment, the method further comprises supplying the liquid to the nozzle.

The liquid can be any liquid suitable for descaling. In one embodiment, said liquid comprises or is water.

The plurality of nozzles may include at least a first nozzle positioned a first radial distance from the axis of rotation and a second nozzle positioned a second radial distance from the axis of rotation; A second radial distance is less than the first radial distance, and the method comprises spraying a different amount of liquid from the first nozzle, in particular a different amount of liquid with each revolution of the nozzle head. include.

By varying the amount of liquid sprayed per revolution with distance from the axis of rotation, more uniform descaling and more efficient use of the descaling liquid can be achieved.

Smaller radial distance nozzles can sweep across a smaller area of the surface of the rolling stock and therefore require less liquid or lower pressure liquid. .

In one embodiment, the method comprises spraying a smaller amount of liquid from said second nozzle than from said first nozzle, in particular a smaller amount of liquid per revolution of said nozzle head.

The invention further relates to a computer program product comprising a computer program or computer readable instructions, said instructions, when read on said computer, for descaling a rolled material operatively connected to said computer. An apparatus adapted to perform a method having some or all of the features described above.

In some examples, the computer program or computer program product includes instructions for registering operating parameters such as flow rate, pressure, rotational speed, distance between material and nozzle of nozzle head and/or nozzle spray angle. You can stay. A computer program or computer program product may be adapted to calculate and/or display the effect on the surface of the rolled material based on these parameters.

The features and many advantages of the apparatus and method for descaling rolled material will become best apparent from the detailed description of the embodiments with reference to the following drawings:
FIG. 1 is a top view of a spray pattern according to the state of the art. Figure 2 is a schematic diagram of a descaling apparatus in which the apparatus and method according to the present invention may be employed; FIG. 3 is a schematic perspective view of a scale removing device according to one embodiment of the invention. FIG. 4 is a schematic perspective view of a nozzle head with nozzles at different radial distances according to one embodiment of the invention; FIG. 5 is a schematic bottom view of a nozzle head showing nozzle locations on different circles, according to one embodiment of the invention. FIG. 6 is a schematic illustration of the relationship between jet opening angle and radial distance of adjacent nozzles, according to one embodiment. Figure 7 schematically shows a spray pattern that can be obtained with a nozzle head according to an embodiment of the invention. FIG. 8 is a flow diagram illustrating a method according to one embodiment of the invention.

Embodiments of the invention will now be described for the example of descaling thin steel hot rolled material by spraying it with water under high pressure. However, the present invention is versatile and can be applied for descaling a wide variety of materials, including hot or cold descaling of ferrous or non-ferrous metals.

FIG. 2 is a schematic diagram of a rolling mill 10 for producing wide steel strip. The steel is annealed in an annealing furnace 12 and enters the rough mill section as rolling stock 14 transported along direction F (indicated by the arrow) by a roller train 16 containing driven rollers.

The rolling mill 10 comprises a plurality of rough rolling mills along the path of the rolled stock 14 . FIG. 2 shows two vertical roughing mills 18 , 18 ′ sandwiching a horizontal roughing mill 20 along the direction of travel F of the rolled stock 14 . However, this is merely an example, and in actual applications, rolling mill 10 may include more vertical and horizontal rough mills and/or finishing mills to shape rolled stock 14 .

As can be further seen from FIG. 1, two descaling devices 22, 22' are arranged between the roughing devices 18, 20 and 20, 18, respectively. These descaling devices 22, 22' are adapted to spray water under high pressure on all four sides of the rolled stock 14 to remove scale layers from the bottom and top and sides of the rolled stock 14. . For example, with a rolling stock 14 having a width of 900 mm and moving in the direction of arrow F at a speed of about 1 meter per second, the descaling devices 22, 22' each run at a pressure of about 1000 to 1200 bar and about 300 to A water flow rate of 6,000 liters can be operated. Descaling of rounds, bars, pipes (inside and outside), forged blocks, and other materials may employ similar parameters.

FIG. 3 shows the layout and design of descaling device 22 in more detail. The descaling devices 22' can be substantially identical.

The descaling device 22 comprises a plurality of nozzle heads 24 arranged in a linear array across the width of the rolled stock 14 . FIG. 3 shows an array of five nozzle heads 24 above the rolled material 14 and four nozzle heads 24 below it. However, the number of nozzle heads 24 in any given scale remover 22 may vary depending on the size and width and shape of the rolled stock 14, its material composition, and operating parameters. In some examples, the descaling device 22 can spray all four sides of the rolled stock 14 , ie, the top and bottom surfaces and the sides of the rolled stock 14 .

Each nozzle head 24 is mounted to rotate about a central axis Z of rotation. For clarity, only one axis Z is shown in FIG. However, each of the nozzle heads 24 likewise has its own axis of rotation, generally all parallel and driven to rotate about their respective axis of rotation Z by a drive unit. The drive unit is not shown in FIG. 3 for ease of presentation, but is described below with reference to FIG. The drive unit may comprise a hydraulic, pneumatic or electric drive motor. Each of the nozzle heads 24 may be provided with their own drive unit. Alternatively, a single integrated drive unit can be used for multiple nozzle heads 24 . In some examples, the drive unit may comprise an electric motor adapted to rotate the nozzle head 24 relative to the surface of the rolling material 14 at a speed of 200-1200 rpm.

As can be further seen from FIG. 3, each nozzle head 24 is connected via a tube 26 to a pressure generating supply unit 28 which supplies the nozzle head 24 with liquid to be sprayed onto the rolling material 14. adapted to For example, the supply unit 28 may receive liquid from a liquid reservoir 30 and may include a plurality of centrifugal or displacement pumps 32 driven by respective motors 34 and It is adapted to supply pressurized liquid to said nozzle head 24 via check valve 36 and tube 26 .

FIG. 4 is a more detailed schematic perspective view of nozzle head 24 .

As can be seen in FIG. 4, nozzle head 24 is generally cylindrical and is rotatably mounted about its central cylindrical axis Z relative to the surface of tube 26 and rolling stock 14 . FIG. 4 also shows a drive unit 38, such as an electric or hydraulic or pneumatic motor, which drives the nozzle head 24 in rotation about the axis Z of rotation.

As can be further seen from FIG. 4, the nozzle head 24 comprises a plurality of nozzles which are mounted on the underside of the nozzle head 24 and rotate with the nozzle head 24 to pump the liquid provided through the tube 26. It is adapted to spray the surface of rolling stock 14 . Some of these nozzles are indicated by reference numerals 40e-40d, nozzles 40a and 40b being located a first radial distance from the cylinder axis Z and nozzles 40c and 40d being a second radial distance from the cylinder axis Z. and the second radial distance is less than the first radial distance. FIG. 4 also shows the corresponding spray patterns 42a-42d of the respective nozzles 40a-40d on the surface of the rolled material 14. FIG.

Some or all of the nozzles 40a-40d may be angled slightly outward, eg, at an outward slant angle in the range of about 10°.

Further, each of the nozzles 40a-40d may be angled forward in the circumferential direction, ie, in the direction of rotation of the spray head 24. As shown in FIG. For example, the circumferential tilt angle of the nozzle may be in the range of about 20°.

As the nozzle head 24 rotates and the nozzles 40a-40d spray liquid onto the surface of the rolled stock 14 under outward and forward inclination angles, a The scaly layer is removed efficiently and thoroughly.

The design and internal operation of the nozzle head 14 may be generally similar to that described in US 5,502,881 and US 2007/0277358 A1, to which full reference is made.

However, unlike the prior art, the nozzles are not all arranged around the outermost perimeter of nozzle head 24 . Rather, the nozzles are positioned at different radial distances from the axis of rotation Z, which will now be described in more detail with reference to FIG.

FIG. 5 is a schematic bottom view of nozzle head 24, showing how multiple nozzles 40a-40e are arranged in nozzle head 24, according to one embodiment.

As can be seen from FIG. 5, the nozzles 40a-40e of the nozzle head 24 can be arranged along three concentric circles 44 ₁ , 44 ₂ , 44 ₃ with different radii r1, r2, r3, the circle 44 ₁ , 44 ₂ , 44 ₃ correspond to the rotation axis Z. FIG. Accordingly, radii r1, r2, r3 represent the radial distances of respective nozzles 40a-40e located on respective circles 44 ₁ , 44 ₂ , 44 ₃ . In the configuration of Figure 5, the _second (central) circle 44-2 is smaller than the _first (outermost) circle 44-1 and has a radius r2 = 0.7 x r1. The _third (innermost) circle 443 is the smallest and has radius r3=0.7*r2.

In general, each of the respective circles 44 ₁ , 44 ₂ , 44 ₃ may contain any number of nozzles. In some examples, any of circles 44 ₁ , 44 ₂ , 44 ₃ includes at least two nozzles.

In some examples, the number of nozzles per circle 44 ₁ , 44 ₂ , 44 ₃ may be up to six.

In the example of FIG. 5, two nozzles 40a, 40b are arranged diametrically opposite on the outermost circle 441 at _a radial distance r1 from the axis of rotation Z. In the example of FIG. _Two nozzles 40c, 40d are diametrically opposed on a central circle 442 at a radial distance r2 from the axis Z of rotation. In the configuration of FIG. 5, the pair of nozzles 40c and 40d are rotated 90° in the circumferential direction (rotational direction) with respect to the pair of nozzles 40a and 40b. A single nozzle 40e is positioned _on the innermost circle 443 at a radial distance r3 from the axis Z of rotation. In another example, the innermost circle 44 ₃ contains two nozzles, which are diametrically opposed, as are the outermost circle 44 ₁ and the central circle 44 ₂ .

The radial distance R between nozzles of different radii is adjusted to the height H of the nozzles above the rolled material 14 such that the spray patterns of adjacent nozzles touch or slightly overlap when impinging the material 14. and depending on the jet opening angle α of the nozzle.

A configuration corresponding to adjacent nozzles 40b, 40c is shown in FIG. 6, where R=r1-r2. Similar considerations apply when R=r2-r3. Based on geometric considerations, we have

As can be seen from this relationship, the jet opening angle α, the radial distance R between adjacent nozzles, and the height H of the nozzles above the surface of the rolled material 14 can be mutually dependent.

The distribution of nozzles 40a-40e at various radial distances from axis of rotation Z results in a more homogenous, more uniform spray pattern across the surface of rolled material . A corresponding spray pattern 46 is shown schematically in FIG. As can be obtained from a comparison of FIG. 7 and FIG. 1, the nozzle head 24 according to the invention helps avoid the formation of strips 104, 104' in the spray pattern. As a result, the surface of the rolled material 14 can be descaled more thoroughly and more uniformly. Furthermore, a given level of desired descaling can be achieved with less liquid and therefore at a lower cost.

The examples of FIGS. 4 and 5 show five nozzles 40a-40e arranged on three different circles 44 ₁ , 44 ₂ , 44 ₃ . However, this is only an example and more or fewer nozzles arranged on a greater or lesser number of circles may be employed.

Furthermore, the nozzles 40a-40e are not necessarily arranged in pairs or in a circle, but are distributed differently under the nozzle head 24 at different radial distances from the axis of rotation Z. sell.

The outward tilt angle and circumferential tilt angle of nozzles 40a-40e may be selected to be the same or different for each of nozzles 40a-40e.

Similarly, the orifice sizes, such as the orifice diameters of nozzles 40a-40e, may vary depending on the distance of each nozzle from the axis Z of rotation. For example, the outermost nozzles 40a, 40b on circle 44-1 may have larger orifices in size _than the innermost nozzle 40e on circle _44-3 so that they sweep across the rolled material . With 14 more surface areas, more liquid can be sprayed per revolution.

As shown in FIG. 3, when multiple nozzle heads 24 are arranged in a row or otherwise arranged across the width of the roll stock 14, all nozzle heads 24 are identical. , and may correspond to the nozzle head 24 described above with reference to FIGS.

However, in other embodiments, the configuration and location of the nozzles may vary depending on the location of the nozzle head 24 on the descaling device 22 . For example, the nozzle heads at the edges or borders of the rolled material 14 may have nozzles with smaller orifice sizes on the outermost circle, or fewer nozzles. In one embodiment, such a nozzle head may correspond to the nozzle head shown in Figure 5, but with the nozzle 40b removed.

In general, the number of nozzle heads, the number of nozzles on different radii of the nozzle heads, the distance between adjacent nozzle heads, the height H of the nozzles above the surface of the rolled stock , and the fluid pressure will determine the desired impingement. To be realized, it can be selected according to the type and surface properties of the rolled material .

A method according to one embodiment of the invention is schematically illustrated in the flow diagram of FIG.

In a first step S10 the nozzle head 24 is rotated about the rotation axis Z with respect to the surface of the rolled material 14 . The nozzle head 24 includes a plurality of nozzles 40a-40e.

In a second step S12, a pressurized liquid, such as water, is sprayed from the nozzles 40a-40e onto the surface of the rolling stock 14, the nozzles 40a-40e being positioned at different radial distances r1 from the axis of rotation Z. , r2 and r3.

The above embodiments and figures merely serve to illustrate the invention and should not be construed as implying any limitation. The scope of the invention is determined by the appended claims.

10 rolling device 12 annealing furnace 14 rolling material
16 roller train 18, 18' vertical roughing mill 20 horizontal roughing mill 22, 22' descaling unit 24 nozzle head 26 tube 28 supply unit 30 liquid reservoir 32 centrifugal pump 34 centrifugal pump motor 36 non-return valve 38 drive unit 40a 40e Nozzles 42a-42d of nozzle head 24 Spray patterns 44 ₁ , 44 ₂ , 44 ₃ of nozzles 40a-40d Circle 46 of nozzle head 24 Spray pattern 100 rolling material
102 spiral spray pattern 104, 104' strip in spiral spray pattern 102;

Claims (14)

A nozzle head (24) for descaling a rolled material (14), the rolled material (14) moving relative to the nozzle head (24),
said nozzle head (24) is adapted to be mounted for rotation about an axis of rotation (Z) relative to the surface of said rolled material (14);
said nozzle head (24) comprises a plurality of nozzles (40a-40e) adapted to spray a liquid onto said rolled material (14);
Said nozzle head (24) comprises a first group of at least three of said nozzles (40a-40e) arranged at a first radial distance (r1, r2, r3) from said axis of rotation (Z); a second group of at least two of said nozzles (40a-40e) positioned at a second radial distance (r1, r2, r3) from the axis of rotation (Z), said second radial distance ( r1, r2, r3) is less than said first radial distance (r1, r2, r3) and the number of nozzles in said second group of said nozzles (40a-40e) is equal to said nozzles (40a-40e) nozzle head (24), which is less than the number of nozzles in said first group of . A nozzle head (24) according to claim 1, wherein said second radial distance (r1, r2, r3) is at most 0.9 times said first radial distance (r1, r2, r3). Nozzle according to claim 1 or 2, wherein the nozzles (40a-40e) are arranged along a plurality of circles (441, 442, 443) or ellipses with different radii (r1, r2, r3). head (24). A nozzle head (24) according to any of the preceding claims, wherein the nozzles (40a-40e) slope radially outward. a first nozzle (40a-40e) positioned at a first radial distance (r1, r2, r3) from said axis of rotation (Z) and slanted radially outward at a first outward tilt angle a first nozzle (40a-40e) and a second nozzle (40a-40e) positioned at a second radial distance (r1, r2, r3) from said axis of rotation (Z) and having a second outward slope a second nozzle (40a-40e) slanted radially outward at an angle;
said second radial distance (r1, r2, r3) is less than said first radial distance (r1, r2, r3) and said second outward tilt angle is different than said first outward tilt angle; A nozzle head (24) according to any preceding claim. The nozzle head (24) according to any of the preceding claims, wherein the nozzles (40a-40e) are inclined in the circumferential direction of the nozzle head (24). First nozzles (40a to 40e) arranged at first radial distances (r1, r2, r3) from said axis of rotation (Z), said first nozzles being circumferentially inclined at a first circumferential inclination angle ( 40a-40e) and second nozzles (40a-40e) positioned at a second radial distance (r1, r2, r3) from said axis of rotation (Z), circumferentially at a second circumferential inclination angle at least inclined second nozzles (40a to 40e),
The second radial distance (r1, r2, r3) is less than the first radial distance (r1, r2, r3), and the second circumferential tilt angle is different from the first circumferential tilt angle. A nozzle head (24) according to any of claims 1-6. a first nozzle (40a-40e) positioned at a first radial distance (r1, r2, r3) from said axis of rotation (Z), said first nozzle (40a-40e) having a first orifice size; , a second nozzle (40a-40e) located at a second radial distance (r1, r2, r3) from said axis of rotation (Z), said second nozzle (40a-40e) having a second orifice size; and at least
2. The second orifice size of claim 1, wherein said second radial distance (r1, r2, r3) is less than said first radial distance (r1, r2, r3) and said second orifice size is different than said first orifice size. 8. A nozzle head (24) according to any of claims 1-7. A device (22, 22') for descaling a rolled material (14), comprising a plurality of nozzle heads (24) according to any one of claims 1 to 8 , said nozzle heads (24) arranged vertically and/or horizontally across the width of said rolling stock (14) and/or arranged in a circle across said rolling stock (14). A device (22, 22') according to claim 9, comprising:
a portion of the plurality of nozzle heads (24) is a first nozzle head (24 ) ;
Said first nozzle head (24) is mounted for rotation about a first axis of rotation (Z) relative to the surface of said rolling material (14) ; comprising a plurality of first nozzles (40a-40e) adapted to spray said liquid onto a material (14);
The plurality of first nozzles (40a-40e) comprises a first group of at least one nozzles (40a-40e) arranged at first radii (r1, r2, r3) and second radii (r1, r2, a second group of at least one nozzle (40a-40e) arranged at a distance r3), said second radius (r1, r2, r3) being smaller than said first radius (r1, r2, r3) ;
a part of the plurality of nozzle heads (24) is a second nozzle head (24 ) ;
Said second nozzle head (24) is mounted for rotation about a second axis of rotation (Z) relative to the surface of said rolling material (14) ; comprising a plurality of second nozzles (40a-40e) adapted to spray said liquid onto the material (14);
The plurality of second nozzles (40a-40e) comprises a first group of at least one nozzles (40a-40e) arranged at first radii (r1, r2, r3) and second radii (r1, r2, a second group of at least one nozzle (40a-40e) arranged at a distance r3), said second radius (r1, r2, r3) being smaller than said first radius (r1, r2, r3) ;
said first nozzle head (24) is positioned closer to the border or edge of said roll stock (14) than said second nozzle head (24);
said first group of nozzles (40a-40e) of said first nozzle head (24) comprises fewer nozzles than said first group of nozzles (40a-40e) of said second nozzle head (24); and /or said first group of nozzles (40a-40e) of said first nozzle head (24) has a smaller orifice size than said first group of nozzles (40a-40e) of said second nozzle head (24); Apparatus (22, 22') according to claim 9, comprising nozzles (40a-40e). A method for descaling a rolled material (14), comprising:
rotating a nozzle head (24) about an axis of rotation (Z) relative to the surface of the rolled material (14), said nozzle head (24) comprising a plurality of nozzles (40a-40e);
spraying pressurized liquid from said nozzles (40a-40e) onto said rolling material (14);
Said nozzle head (24) comprises a first group of at least three of said nozzles (40a-40e) arranged at a first radial distance (r1, r2, r3) from said axis of rotation (Z); a second group of at least two of said nozzles (40a-40e) positioned at a second radial distance (r1, r2, r3) from the axis of rotation (Z), said second radial distance ( r1, r2, r3) is less than said first radial distance (r1, r2, r3) and the number of nozzles in said second group of said nozzles (40a-40e) is equal to said nozzles (40a-40e) less than the number of nozzles in said first group of . 12. The method of claim 11, wherein the rolled material ( 14) is a metallic heated or unheated material . The plurality of nozzles (40a-40e) includes first nozzles (40a-40e) positioned at a first radial distance (r1, r2, r3) from the axis of rotation (Z); and a second nozzle (40a-40e) positioned a second radial distance (r1, r2, r3) from distance (r1, r2, r3), said method spraying a different amount of liquid from said second nozzles (40a-40e) than from said first nozzles (40a-40e); 13. A method according to claim 11 or 12, comprising A computer program comprising computer readable instructions, said instructions being read by said computer, an apparatus (22, 22') for descaling a rolled material (14) operatively connected to said computer. ), adapted to perform the method according to any of claims 11-13.