EP3914403B1 - Device and method for descaling a moving workpiece - Google Patents

Description

The invention relates to a device according to the preamble of claims 1 and 3 and a method according to the preamble of claim 15 for descaling a workpiece which is moved in one direction of movement relative to the device. The workpiece is in particular a hot-rolled product.

According to the state of the art, it is known to spray water at high pressure onto the surfaces of the workpiece in order to descale workpieces, in particular hot-rolled stock. For complete descaling of the workpiece surfaces, the high-pressure spray water is usually sprayed out of several nozzles of a descaler. In this context, a hot rolling mill descaler is an assembly used to remove scale, i. H. iron oxide impurities from the surface of the rolling stock.

Out of WO 2005/082555 A1 a descaler is known, with which a rolling stock that is moving relative to the descaler is descaled by blasting with high-pressure spray water. This descaler comprises at least one row of nozzle heads covering the width of the rolling stock and having a plurality of nozzle heads, each nozzle head being driven in rotation about an axis of rotation perpendicular to the surface of the rolling stock. Furthermore, each nozzle head is provided with at least two nozzles which are arranged eccentrically with respect to the axis of rotation and which are arranged as close as structurally possible to the circumference of the nozzle head. Such a descaler is subject to the disadvantage that an energy input over the width of the rolling stock can have inhomogeneities, so that there are permanent temperature stripes on the rolling stock in the overlapping area of adjacent nozzle heads. Furthermore, the nozzles on the respective nozzle heads are arranged at an angle of attack outwards, which is shown in the 14 is illustrated. This causes the spray direction of these nozzles is also aligned in the direction of feed of the rolling stock when the nozzle heads rotate about their axis of rotation. Such an alignment of the high-pressure spray water discharged from the nozzles is disadvantageous in that the spray water jet is ineffective and therefore does not contribute to descaling the surface of the rolling stock. Yet another disadvantage of a descaler according to WO 2005/082555 A1 Because of the fixed nozzles on the rotatable head, the problem is that the scale is removed or blasted off the surface of the rolling stock in all directions, so that it is difficult to collect or transport the scale in a targeted manner.

Out of WO 2017/157940 A1 discloses a generic device and a generic method for descaling a workpiece that is moved relative to the device in a direction of movement. For this purpose, several blasting nozzles are attached to a rotating rotor head, with liquid being discharged or sprayed under high pressure from the blasting nozzles onto a surface of the rolling stock in such a way that the direction in which the liquid is sprayed out of the blasting nozzles onto the surface of the workpiece is changed , is always applied to a surface of the rolling stock at an angle of attack obliquely with respect to an orthogonal one.

Out of EP 1 707 283 B1 a method and a device for descaling the surfaces of slabs, strips or the like are known, wherein a high-pressure fluid is jetted onto the surface of the material to be descaled by means of one or more nozzle or spray beams and through nozzles attached thereto. Here, the nozzles for spraying out the fluid are fixed to a spray bar without rotating.

In the prior art mentioned above, the water and the scale particles removed as a result from a surface of the rolling stock reach a sintering channel located below the rolling train. Here, the water and the scale particles are collected into a mixture, in connection with portions of oil and grease that come from the rolling mills. The roll gap lubricating oil and the lubricants used in excess for the bearings of the stand rolls and the Rollers of the rolling train also get into the sinter channel. As a result, the water and the scale particles removed from the descaling process are now contaminated with oil or grease, which on the one hand prevents the scale particles from being directly reused and on the other hand requires complex treatment or clarification of the water. A further disadvantage of conventional descalers is that their proper functioning is dependent on a minimum water quantity and a minimum incline of the sinter channel, which prevents the use of water-saving measures or corresponding methods.

Out of DE 198 17 002 A1 and JP H08 90052 A are each known devices for descaling a workpiece according to the preamble of claim 1 and 3, respectively.

Out of KR 2013 0064613 A a device for treating the surface of a steel sheet is known, with which water in combination with sludge is applied under pressure to the surface of the steel sheet. Treating the surface solely with high-pressure water is in accordance with the device KR 2013 0064613 A not provided.

EP 0 513 809 A2 discloses a method for processing coolants and/or lubricants used in rolling mills and an associated processing plant. Here, in separate treatment steps of coarse rollers, scale is separated from contaminated process water by means of gravity sedimentation, with the medium and fine roll scale particles then being removed from the process water pre-clarified in this way, for example by means of magnetic separation.

Out of DE 10 2016 223 131 A1 a device and a method for applying a liquid medium to a roller and/or to a rolling stock and/or for removing the liquid medium are known.

The invention is based on the object of descaling a workpiece with regard to the reusability of removed scale and a related purpose liquid used preferably in the form of water to optimize with simple means.

This object is achieved by an apparatus having the features defined in claim 1 and claim 3, and by a method having the features defined in claim 15. Advantageous developments of the invention are defined in the dependent claims.

A device according to the present invention is used for descaling a workpiece, preferably a hot-rolled product, and comprises at least one head element on which a plurality of jet nozzles are attached, with a liquid in the form of water being sprayed onto the workpiece from the jet nozzles at an angle of attack obliquely with respect to an orthogonal a surface of the workpiece can be discharged, and a roller table on which the workpiece can be moved in a direction of movement relative to the head element. Means in the form of at least one container or in the form of a conveyor belt are arranged below the roller table for picking up or transporting away scale that has been removed from a surface of the workpiece by the liquid discharged from the jet nozzles. In the case of the container, drainage openings are provided in its bottom area.

In the same way, the invention also provides a method for descaling a workpiece, preferably a hot-rolled product. In this case, the workpiece is moved on a roller table in one direction of movement relative to a device with at least one head element on which several jet nozzles are attached, with a liquid in the form of water being applied from the jet nozzles onto the workpiece at an angle of attack obliquely to the surface of the workpiece becomes. Scale, which has been removed from a surface of the workpiece by the liquid discharged from the jet nozzles, is transferred into or onto means for receiving or transporting away this scale, which means are arranged below the roller table. Furthermore, the scale is dewatered on or in the means, so that the scale can be reused without further pre-treatment steps

The invention is based on the essential knowledge that the scale, which has been removed from a surface of the workpiece by using a (high-pressure) liquid, is picked up or transported away by means which are arranged below the roller table. This ensures that the scale does not get into the sintering channel and is therefore collected separately and thus free of oil by the said means. These means are expediently equipped with drainage measures so that the liquid, preferably water, with which the scale has been removed from a surface of the workpiece can flow off and the scale on or in the means is thus suitably drained. In this way, direct reuse of the scale, for example as sintered material, is possible without further pre-treatment steps. Said collection of the oil-free scale or corresponding particles by the means, which are arranged below the roller table as explained, applies in the same way to scale that has been removed from a surface of the workpiece on its upper side and/or on its lower side. The way in which a liquid is applied to a surface of the workpiece on its upper side or underside for the purpose of removing scale is irrelevant in this context, regardless of whether the head element on which the jet nozzles are attached rotates or Not.

At this point, it is pointed out separately that in a device according to the present invention, a head element on which a plurality of jet nozzles for dispensing or spraying out a liquid are attached can be designed in particular as a stationary spray bar. As an alternative to this, it is also possible to design such a head element in the form of a rotor head. The effect explained above, according to which scale that has been removed can be collected in a targeted manner by means arranged below the roller table, is guaranteed in both of these variants of such a head element.

Said means for receiving or transporting scale may be formed as one or a plurality of such containers which may be suitably positioned beneath the roller table for loading therein to pick up the removed tinder. In the case of a plurality of such containers, it is expedient for them to be moved transversely to the direction of movement of the workpiece in order to always achieve sufficient capacity for the scale removed. According to a further embodiment, these means are designed as a conveyor belt, which preferably runs transversely to the direction of movement of the workpiece and thereby transports the scale away to a location where the scale can be stored or picked up. In any case, a container or a conveyor belt below the roller table ensures that the scale removed from a surface of the workpiece does not fall into the sinter channel and mix there with oil or fat.

In an advantageous development of the invention, scale that has been removed from a surface on an upper side of the workpiece can be collected. For this purpose, a head element with attached jet nozzles and a collecting device are provided above the roller table. The collecting device is arranged upstream of the head element with respect to the direction of movement of the rolling stock. As a result, both the water discharged from the jet nozzles after bouncing off the surface of the workpiece and the scale, which has been removed by the liquid from the surface of the workpiece on its upper side, are introduced in a targeted manner into the collecting device.

In the last-mentioned development of the invention, the scale that has collected in the collecting device after removal of a surface of the workpiece on its upper side can be removed from this collecting device by using rinsing nozzles, from which a fluid, preferably in the form of Water and under pressure strikes the scale within the catcher toward a side edge thereof. An opening is formed at this side edge, through which the scale is then discharged from the collecting device and falls down into or onto the means for receiving or transporting away scale. Here, a separation of the water and the scale outside the collecting device, after the scale has escaped from the opening at the side edge of the collecting device, is advantageously achieved by in that a header pipe for collecting the water is arranged adjacent to the opening formed in the side edge, this header pipe being spaced from the opening such that a gap is formed therebetween. The means for picking up or removing scale is positioned just below this gap. If the fluid, preferably in the form of water, is used to remove the scale from the collecting device through the opening at its side edge, the scale or the associated lumps of scale fall, following gravity, directly down through said gap into or onto it the means for picking up or transporting away scale, whereby the fluid, preferably water, flows across this gap due to the kinetic energy and is then collected by the collecting pipe.

In an advantageous development of the invention, it can be provided that the collecting pipe is connected to a separate water treatment plant. This ensures that the water, with which scale has been removed from a surface of the workpiece on its upper side, does not get into the sintering channel, but instead is fed through a separate return line to the water treatment layer.

In order to reduce the amount of water used, according to an advantageous development of the invention, it can be provided that water from the flushing nozzles, which are provided for discharging the scale within the collecting device, is not discharged permanently but instead only at intervals. This means that these flushing nozzles are only switched on periodically, but are not constantly in operation. Accordingly, one can first wait until a sufficient amount of scale has collected in the collecting device after the removal of a surface of the workpiece on its upper side, before then - if there is a sufficiently large amount of scale - the water from the rinsing nozzles in the direction of a Lateral edge of the catcher and the opening formed therein is sprayed in order, as explained, to discharge the scale from this opening laterally out of the catcher.

According to an advantageous development of the invention, it is expedient if a fluid, preferably water, is discharged under high pressure from the flushing nozzles. This ensures that the scale accumulated in the collecting device is effectively and comprehensively moved in the direction of a side edge and the opening formed therein in a short time.

If the catching device arranged above the roller table should have a relatively large width transverse to the direction of movement of the workpiece, it is expedient according to an advantageous development of the invention for a dividing element to be arranged in a central section of the catching device is used to divide the catcher into two areas, ie left and right of center. For example, such a dividing element can be designed in the form of a plough, the tip of which points in the direction of the head element and the jet nozzles attached thereto. With the help of such a dividing element or plow it is achieved that the liquid discharged from the jet nozzles after bouncing off the surface of the workpiece and the scale particles removed thereby reach the two partial areas of the collecting device respectively to the left and to the right. This has the advantage that a distance from a center to a respective side edge of the collecting device is smaller than its total width, which optimizes discharge of the scale collected in the collecting device through the opening formed on a side edge of the collecting device.

With regard to the last-mentioned development of the invention, it is advantageous if an opening is formed on both side edges of the collecting device, through which the accumulated scale is discharged by means of the fluid discharged from the flushing nozzles. In this case, it is expedient that the flushing nozzles are each arranged in the shadow of the plow and are each aligned in the direction of the openings on a side edge of the collecting device.

In an advantageous development of the invention, mechanical transport elements can be arranged inside the collecting device, with the collecting device having an opening on at least one side edge thereof. By means of such mechanical transport elements, it is possible to move scale that has been removed within the collecting device in the direction of the opening. As a result, scale that has been removed can be discharged out of the collecting device through the opening, with the means for receiving or transporting away scale that has been removed being able to be arranged outside of the collecting device and adjacent to its opening. Corresponding removed scale, when it passes out of the opening of the catcher, is received by or into said means.

The transport elements mentioned above, which can be arranged inside the collecting device, can be designed as a screw, pusher, stamp, conveyor belt or the like. In any case, it is ensured by such mechanical transport elements that removed scale can be moved within the collecting device in a targeted manner in the direction of the opening formed on a side edge thereof in order to discharge the scale through this opening from the collecting device.

With the present invention, it is also possible to remove scale from a surface of the workpiece on the underside thereof. For this purpose, at least one head element with jet nozzles attached thereto and--seen in the direction of movement of the workpiece--upstream of the head element and adjacent thereto an elongate separating device are provided below the roller table. An upper edge of the separating device borders on an underside of the roller table, with the separating device extending essentially vertically downwards, starting from the underside of the roller table, and the means for picking up or transporting away scale that has been removed are arranged on a side of the separating device that faces the head element facing opposite.

In connection with such an arrangement of a separation device, use is made of the fact that water and scale are reflected at different angles from an underside of the workpiece. More specifically, the scale bounces off the underside of the workpiece almost vertically downwards and then falls into or onto the scale receiving means, eg in the form of a container, positioned below the roller table on the side of the separation device which facing the head element with the attached jet nozzles. In contrast, the water jet has as it reflects off the bottom of the workpiece, it has a much larger horizontal component, with the result that the angle at which the water reflects off the bottom of the workpiece is larger by comparison than in scale. As a result, the water then reaches the other side of the separation device, which is opposite the head element with the attached jet nozzles. In this way, scale and water on the underside of the roller table are suitably separated from one another, with the water being able to be introduced into a separate water treatment plant in a targeted manner through separate lines without getting into the sinter channel.

In the event that water, after it has been separated from the removed scale and does not get into the sinter channel, e.g. B. as explained above by means of the collecting pipe adjacent to an opening in a side edge of the collecting device arranged above the roller table and/or by means of a separating device arranged below the roller table, it can be provided that such oil-free descaling water is collected in a part or area, which is spatially separated from the sinter channel, in which case this oil-free water can then be fed to a suitable treatment stage of a water treatment plant with little effort through separate return lines. Here, the water is routed past the sinter well and is only introduced into the pipe system of the water treatment plant downstream of it. As an alternative to this, it is possible for the water to be fed directly to a cooling tower.

The present invention is particularly suitable for use in a primary descaler. This is because primary scale typically consists of larger, thicker particles that are easier to capture and separate from the water. In addition, the amounts of primary scale removed from the surfaces of a workpiece are relatively large, so that the additional expense for the components according to the invention explained above is economically viable.

In connection with the present invention, it is advisable to use descalers of a type that reduces the amount of water used to a minimum. This reduces the amount of water used for descaling, making it easier to separate the scale that has been removed from the water. Advantageously, with the invention rotating descaling units, z. B. in the form of rotor heads rotating about an axis of rotation, or also conventional descalers, with which a minimum amount of water adapted to the rolling quality is achieved at a minimum sufficient pressure.

Preferred exemplary embodiments of the invention are described in detail below using a schematically simplified drawing.

Fig. 1

eine prinzipiell vereinfachte Seitenansicht eines Teils einer erfindungsgemäßen Vorrichtung,

Fig. 2

eine Seitenansicht eines Rotorkopfes der Vorrichtung von Fig. 1,

Fig. 3

eine prinzipiell vereinfachte Draufsicht auf eine erfindungsgemäße Vorrichtung nach einer weiteren Ausführungsform,

Fig. 4

eine vereinfachte Frontalansicht eines Rotormoduls, bei dem eine Mehrzahl von Rotorköpfen nebeneinander und quer zur Bewegungs-richtung des Werkstücks angeordnet sind,

Fig. 5

eine vereinfachte Querschnittsansicht einer Auffangeinrichtung der Vorrichtung von Fig. 3,

Fig. 6

eine prinzipiell vereinfachte Seitenansicht einer erfindungsgemäßen Vorrichtung,

Fig. 7

eine prinzipiell vereinfachte Draufsicht auf die Ausführungsform einer Vorrichtung von Fig. 6,

Fig. 8

eine prinzipiell vereinfachte Seitenansicht einer erfindungsgemäßen Vorrichtung nach einer weiteren Ausführungsform,

Fig. 9

eine prinzipiell vereinfachte Draufsicht auf die Ausführungsform einer Vorrichtung von Fig. 8,

Fig. 10

eine Seitenansicht einer Auffangeinrichtung und eines Kopfelements mit daran angebrachten Strahldüsen, als Teil der Vorrichtung von Fig. 1,

Fig. 11

eine prinzipiell vereinfachte Draufsicht der Komponenten von Fig. 10,

Fig. 12

eine prinzipiell vereinfachte Seitenansicht einer erfindungsgemäßen Vorrichtung nach einer weiteren Ausführungsform, und

Fig. 13

ein schematisches Diagramm von Komponenten einer Wasseraufbereitungsanlage.

Show it:

1

a basically simplified side view of a part of a device according to the invention,

2

a side view of a rotor head of the device of FIG 1 ,

3

a basically simplified plan view of a device according to the invention according to a further embodiment,

4

a simplified front view of a rotor module, in which a plurality of rotor heads are arranged side by side and transverse to the direction of movement of the workpiece,

figure 5

a simplified cross-sectional view of a catcher of the device of FIG 3 ,

6

a basically simplified side view of a device according to the invention,

7

a basically simplified plan view of the embodiment of a device from 6 ,

8

a basically simplified side view of a device according to the invention according to a further embodiment,

9

a basically simplified plan view of the embodiment of a device from 8 ,

10

a side view of a catcher and a head element with attached jet nozzles, as part of the device of 1 ,

11

a principally simplified plan view of the components of 10 ,

12

a basically simplified side view of a device according to the invention according to a further embodiment, and

13

a schematic diagram of components of a water treatment plant.

In the following, with reference to the Figures 1 to 13 various embodiments of the invention are described in detail. In the figures, the same technical features are each denoted by the same reference symbols. Furthermore, it is pointed out that the representations in the drawing are simplified in principle and, in particular, are shown without scale. Cartesian coordinate systems are entered in some figures for the purpose of spatial orientation of the embodiments according to the invention in relation to a workpiece to be treated and moved.

A device 10 according to the invention is used for descaling a workpiece 12 which is moved relative to the device 10 via a roller table 40 in a direction of movement X. The workpiece 12 can be hot-rolled stock that is moved past the device 10 .

According to 1 the device 10 comprises at least one head element 14 above the roller table 40, on which a plurality of jet nozzles 16 are attached. At a End face of the head element 14, which faces the workpiece 12, jet nozzles 16 are attached. A liquid 18 (in 1 symbolized in simplified form by dashed lines) is sprayed under high pressure onto a surface 20 of the workpiece 12 in order to suitably descale the workpiece. To this end, the jet nozzles 16 are in fluid communication with a high-pressure pump unit (not shown) by means of which the jet nozzles 16 are supplied with a liquid under high pressure. The liquid 18 is preferably water, without any restriction to water being to be seen here. The head element 14 is designed in the form of a rotor head which can be rotated about an axis of rotation R. The rotor head 14 is rotated about its axis of rotation R by motor means (not shown), for example by an electric motor. In the following, the head element 14 is always referred to as the rotor head, without any restriction to such a rotating element being seen here. Instead, the head element 14 can also be designed as a stationary spray bar.

Referring to the 1 it is again emphasized separately that the workpiece 12 can be moved on the roller table 40 relative to the head element or rotor head 14, namely in the direction of movement X.

The device 10 comprises a collecting device 22 which is provided above the roller table 40 and is arranged upstream of the rotor head 14 with respect to the direction of movement X of the workpiece 12 . Such a collecting device 22 serves the purpose of collecting both scale that has been removed from the surface 20 of the workpiece 12 on its upper side by means of the high-pressure liquid and the liquid that ricochets off it after contact with the surface 20 of the workpiece 12 , record. In the representation of 1 removed scale and the liquid that bounced off the surface 20 of the workpiece 10 are symbolized in simplified form by dash-dotted lines.

A lower baffle plate 23.1 is provided in connection with the catching device 22 and is arranged between the rotor head 14 and the catching device 22 and is directly adjacent to an open area of the catching device 22. The lower guide plate 23.1 is attached or fastened to the collecting device 22 in such a way that its free end is positioned directly above the workpiece 12 and forms an angle δ ( 1 ) between 15-45°. The lower guide plate 23.1 is preferably attached in such a way that the angle δ to the surface 20 of the workpiece 12 assumes a value between 25-35°, particularly preferably 30°.

The lower baffle plate 23.1 is arranged corresponding to the angle δ of preferably 30°, rising flatly in the direction of the collecting device 22. The lower baffle plate 23.1 thus fulfills the task of an impact surface and causes the scale and the liquid that has bounced off the surface 20 to enter the collecting device 22 in a targeted manner.

In addition, a covering device is also provided in the form of an upper cover plate 23.2, which extends from the collecting device 22 right up to the rotor head 14 and thereby assumes the function of a cover. The distance between an edge of the upper cover plate 23.2, which is directly adjacent to the rotor head 14, is chosen such that the section between the edge of the upper cover plate 23.2 and the rotor head 14 is free of passage with regard to scale particles. For the purposes of the present invention, "permeability-free" means that scale particles, when they are detached from the surface 20 of the workpiece 12 as a result of the water sprayed out, cannot escape between the edge of the upper cover plate 23.2 immediately adjacent to the rotor head 14 and the rotor head 14 . Correspondingly, the upper cover plate 23.2 prevents scale or liquid that has ricocheted off the surface 20 of the workpiece 12 from escaping upward into the environment. Nevertheless, this ensures that air through the Section can pass between the upper cover plate 23.2 and the rotor head 14, so that during operation of the device 10 according to the invention no dynamic pressure forms below the upper cover plate 23.2.

Below are with reference to the 2 further relationships for the arrangement of the rotor head 14 and the jet nozzles 16 attached to it are explained:
The jet nozzles 16 are fixedly attached to an end face of the rotor head 14 opposite the workpiece 12 . In this case, the longitudinal axes L of the jet nozzles 16 are aligned parallel to the axis of rotation R of the rotor head 14 . The spraying direction S also runs correspondingly (cf. 2 ) in which the liquid is ejected from the jet nozzles 16, parallel to the axis of rotation R of the rotor head 14.

The axis of rotation R is inclined at an angle γ ( 2 ) arranged inclined. The attachment of the jet nozzles 16 to the rotor head 14, in which, as explained, the longitudinal axes L of the jet nozzles run parallel to the axis of rotation R, results in an angle of incidence α (cf. 2 ) with which the liquid 18 sprayed from the jet nozzles 16 impinges on the surface 20 of the workpiece. This angle of attack α corresponds to an angle between the spraying direction S of the liquid 18 and an orthogonal line on the surface 20 of the workpiece 12. Because of the parallel alignment of the longitudinal axes L of the jet nozzles 16 with the axis of rotation R, the angle of attack α in the embodiment of 2 equal to the angle of inclination γ of the axis of rotation R.

The rotor head 14 can be designed to be adjustable in height. In this case, a distance A, which an intersection of the axis of rotation R with the end face of the rotor head 14 has to the surface 20 of the workpiece 12 ( 2 ), can be changed if necessary. This distance is within the meaning of the present invention A to be understood as the spray distance. As this distance A decreases, the resultant impact pressure of the liquid 18 on the surface 20 of the workpiece 12 increases. The height adjustability for the rotor head 14 is in the 2 simplified by the arrow "H" symbolized, and can be realized by a height-adjustable bracket to which the rotor head 14 is attached.

At this point it is pointed out separately that the alignment of the spraying direction S explained above (cf. 3 ) remains unchanged or constant during a rotation of the rotor head 14 about its axis of rotation R. The same applies to the angle of attack a.

With regard to the rotor head 14 according to FIG 2 it is pointed out that this rotor head 14 that of 1 can match.

Further details for the device 10 according to the invention are in FIG 3 shown, namely in a fundamentally greatly simplified plan view. In this embodiment, two rotor heads 14.1 and 14.2 are arranged one behind the other with respect to the direction of movement X of the workpiece 12. Each of these rotor heads 14.1 and 14.2 is assigned its own collecting device 22, which is arranged upstream of an associated rotor head in each case with respect to the direction of movement X of the workpiece 12. In principle, instead of the rotor head 14.2, a different type of jet nozzle can also be provided.

The top view of 3 makes it clear that the spraying direction S, with which the liquid 18 is discharged from the jet nozzles 16 attached to a rotor head 14, runs opposite to the direction of movement X of the workpiece 12. The result of this is that the spraying direction S of the liquid 18, when it is sprayed permanently under high pressure from the jet nozzles 16 onto the workpiece 12, does not have any proportion that extends in the direction of a lateral edge 13 of the workpiece 12 has. Instead, the spraying direction S is aimed directly at an associated collecting device 22 . This ensures that the liquid 18 is always sprayed precisely in the direction of an associated collecting device 22 from the jet nozzles 16 attached to a rotor head 14 . As a result, scale that has been removed is introduced into the collecting device 22 in a targeted manner in connection with the liquid that has ricocheted off the surface 20 of the workpiece.

The entry of removed scale and liquid, which bounces off the surface 20 of the workpiece 12 after contact with the workpiece 12, into a respective collecting device 22 is supported, as explained above, by the lower baffle plate 23.1, which rises flatly at the angle δ, and is 3 symbolized by the arrows "E".

According to a further embodiment of the device 10 according to the invention, a plurality of rotor heads 14 are combined to form rotor head modules 30 above and below the workpiece 12, which can be seen in the basically simplified front view of FIG 4 is shown. These rotor head modules 30 thus form a rotor module pair 31. Specifically, the respective rotor head modules 30 consist of a plurality of rotor heads 14, which are arranged next to one another and transversely to the direction of movement X of the workpiece. Deviating from the representation in the 4 fewer or more than three rotor heads 14 can also be combined to form a rotor module 30 .

In a rotor module 30 according to the embodiment of FIG 4 For example, the width of a workpiece 12, ie in a direction transverse to its direction of movement X, is covered by a plurality of rotor heads 14 as shown. In other words, the width of such a rotor module 30 essentially corresponds to a width of the workpiece 12. This leads to the advantage that, in contrast to, for example, only a single rotor head whose diameter corresponds to the width of the workpiece 12, then the diameter of the individual rotor heads is one Rotor module 3 can each be smaller, with the advantage that higher speeds can then be set for these rotor heads, possibly also to adapt to high rolling speeds or high feed speeds for the workpiece.

Regarding the embodiment according to 4 it is pointed out that the individual rotor heads 14 are connected to a common pressurized water line D, the pressurized water line D being connected to a high-pressure pump unit. This ensures that the jet nozzles 16 attached to the rotor heads are supplied with high-pressure water.

In the embodiment according to 3 Deviating from the illustration shown, it can also be provided that instead of the individual rotor heads 14.1 and 14.2, which are arranged one behind the other in relation to the direction of movement X, rotor modules 30 are also provided, namely - because of the arrangement above and below the workpiece 12 - in the form of Rotor module pairs 31 according to 4 .

It is advantageous if the individual rotors of a rotor head module 30 can be switched off individually and/or in groups without pressure and the application of the liquid 18 is thus adapted to the width of the workpiece 12 .

A scale detection device 32 can be provided for the invention, which is arranged downstream of a rotor head 14 or a pair of rotor modules 31 with respect to the direction of movement X of the workpiece 12, whereby for the sake of simplicity reference is made below only to a rotor head 14, without a limitation can be seen. In the embodiment of 3 such a scale detection device 32 is arranged downstream of the rotor head 14.2. Regardless of the number of rotor heads that can be arranged in series with respect to the direction of movement X of the workpiece 12 in the present invention, it is for the scale detection device 32 of importance that they are in spatial proximity and downstream of a rotor head (e.g. rotor head 14.2 according to 4 ) of the device 10 is arranged, at least before the workpiece 12 z. B. is subjected to a renewed rolling process.

The device 10 includes a control device 34 (cf. 1 , 3 ), with which various components of the device 10 are connected in terms of signaling and can be suitably controlled. This is explained in more detail below.

The scale detection device 32 is connected in terms of signals to the control device 34 ( 1 , 3 ). The scale detection device 32 can be used to reliably identify or detect any remaining scale on the surface 20 of the workpiece 12 after the liquid 18 has been sprayed onto the workpiece 12 . For this purpose, the scale detection device 32 extends completely across the width of the workpiece 12. It should also be pointed out that a scale detection device 32 can be provided above and below the workpiece 12, ie on its top and bottom. Correspondingly, it is possible by means of the scale detection device 32 to detect possible residual scale on both surfaces of the workpiece 12 .

In the representations of 1 and 3 is symbolically shown that a rotor head 14 is also connected to the control device 34 in terms of signals. This means that it is possible by means of the control device 34 to suitably change the pressure with which the liquid sprayed from the jet nozzles 16 impinges on a surface 20 of the workpiece 20 . Such a change in the impact pressure of the liquid can take place, for example, by switching a pump of the high-pressure pump unit on or off, to which the pressurized water line D for the jet nozzles 16 is connected. In addition or as an alternative, it can be provided that the high-pressure pump unit with which the pressure supply for the jet nozzles 16 is equipped with a frequency controller in order to achieve an even better adjustment of the desired pressure for the jet nozzles 16.

Furthermore, the speed at which the rotor head 14 is rotated about its axis of rotation R can also be adjusted by means of the control device 34, for example as a function of the feed rate at which the workpiece is moved past the device 10 in its direction of movement X. By means of such an adjustment of the rotational speed for the rotor head 14, in particular to the feed speed of the workpiece 12 in its direction of movement X, an optimal energy input for the liquid 18 sprayed onto the surface 20 of the workpiece 12 is achieved, namely along the direction of movement X.

Further details of the device 10 according to the invention, also with regard to the collecting device 22 arranged above the roller table 40, are given below with reference to FIG Figures 5-11 explained.

figure 5 Figure 12 shows a cross-sectional view of the catcher 22 taken across a width of (in figure 5 not shown) roller table 40. Here, a bottom surface 25 of the collecting device 22 is formed substantially horizontally. Alternatively to this - in figure 5 indicated by dashed lines - the bottom surface 25 can also be designed to fall laterally towards the side edges 24 of the collecting device 22 starting from a central section M of the collecting device 22 .

The collecting device 22 is equipped with flushing nozzles 28 which are each aligned in the direction of a side edge 24 of the collecting device 22 . If scale removed during descaling of the workpiece 12 has accumulated on the bottom surface 25 of the collecting device 22, the scale is discharged out of the collecting device 22 in that a fluid 19, preferably water under high pressure, is sprayed from the rinsing nozzles 28 onto the Scale is sprayed towards a side edge 24, which is explained in more detail below. As an alternative to this, it is also possible to discharge a fluid 19 in the form of compressed air from the flushing nozzles 28, which has the same effect as spraying out water.

6 shows the device 10 according to the invention in a basically simplified side view. An opening 44 is formed on or in a side edge 24 of the collecting device 22 arranged above the roller table 40 . A baffle plate 45 is arranged laterally adjacent to this opening 44 and outside the collecting device 22 . For further illustration, the device of 6 in the representation of 7 shown again in a plan view.

The device 10 comprises means 42 for picking up or transporting away scale, which are arranged below the roller table 40 and are designed in the form of a plurality of containers 43 in the embodiment shown here. To guide the containers 43 , a separate passage or guide mechanism is created, which traverses a rolling train or the roller table 40 above a sintering channel 54 . The guiding mechanism for the containers 43 is set up in such a way that there is always an (initially empty) container 43 directly below the baffle plate 45 .

The cleaning liquid and scale Z are discharged from the collecting device 22 in such a way that a fluid 19, preferably water under high pressure, is discharged from the flushing nozzles 28 onto the scale Z, which has accumulated on the bottom surface 25 of the collecting device 22, in the direction of a Side edge 24 is discharged or sprayed. As a result, the scale particles Z come into contact with the water 19 through the opening 44 to the outside and are deflected downwards by the baffle plate 45 in order to thereby reach a container 43 located underneath.

A container 43 in which scale particles Z are received in combination with water is positioned above the sintering trough 54 . Drainage openings (not shown) are expediently formed in a bottom region of the container 43, through which water (but not scale) can escape downwards. Correspondingly, the scale Z, which has been placed in a container 43, can be dewatered by means of the dewatering openings mentioned, in that water, as in 6 is symbolized by the three arrows pointing downwards, exits downwards from the container 43 and then enters the sintering channel 54 .

A modified embodiment of the discharge principle, with which scale particles Z and water are discharged through an opening 44 in a side edge 24 of the collecting device, is shown in a side view of the device 10 according to FIG 8 and in a corresponding top view according to FIG 9 illustrated. In the same way as in the embodiment of FIG 6 flushing nozzles 28 are provided here, with which a fluid 19, preferably water under (high) pressure, is discharged in the direction of the opening 44, which is formed in a side edge 24 of the collecting device 22, in order to thereby remove the scale particles collected on the bottom surface 25 Z towards the opening 44 to move. Disposed outside of the catcher 22 and adjacent to the opening 44 is a manifold 46 which is spaced from the opening 44 such that a gap 48 is formed therebetween.

The discharge of scale Z in the embodiment according to 8 and 9 now works in such a way that the scale particles Z, after they have passed through the opening 44, fall down, following the force of gravity, immediately through the gap 48 and consequently into a container 43 which is positioned directly below the gap 48. get in. In contrast, the water 19 "shoots" across the gap 48 and is then received in the collecting pipe 46 .

the Figures 10 and 11 illustrate a further embodiment of the device 10 according to the invention. The schematically simplified side view according to FIG 10 (analogous to 1 ) makes it clear that—seen in the direction of movement X of the workpiece 12—downstream of the collecting device 22 is a rotor head 14 or corresponding rotor head modules 30 (cf. 4 ) are arranged. Furthermore, the 11 which is a top view of the 10 shows that openings 44 are formed on both side edges 24 of the collecting device 22, wherein in the central section M (cf. figure 5 ) A dividing element in the form of a plow 50 is attached to the collecting device 22, the tip S of which points in the direction of the rotor head 14 or the rotor head modules 30. The collecting device 22 is divided into two areas 22.1, 22.2 by the plow 50. In each case in the shadow of the plow 50 and in alignment with the respective openings on the side edges 24 of the collecting device 22, flushing nozzles 28 are provided, from which a fluid 19, preferably water under pressure, is discharged in the direction of the openings 44.

In relation to the just explained embodiment according to Figures 10 and 11 it is pointed out that scale, which has been removed from a surface 20 of the workpiece 12 by means of the liquid 18, which has been removed from the jet nozzles 16 attached to a rotor head 14, due to the plow 50 in the two separate areas 22.1, 22.2 of the collecting device 22 is directed into it. This has the advantage that the distance from the point at which the scale particles Z are collected in a respective area 22.1, 22.2 on the bottom surface 25 to the opening 44 on or in a respective side edge 24 of the collecting device 22 then becomes smaller . This reduced distance to the openings 44 optimizes a lateral discharge of scale particles Z at the side edges 24 of the collecting device 22, in that a fluid 19 is discharged from the flushing nozzles 28 in the direction of these openings 44, and can be realized in the same way as previously in connection with the embodiment according to 6 and 7 or the embodiment according to the 8 and 9 explained.

In the 12 a further embodiment of the device 10 according to the invention is shown, which illustrates the removal of scale Z on an underside of the workpiece 12 . At least one head element or rotor head 14 with jet nozzles 16 attached thereto is attached below the roller table 40, wherein—seen in the direction of movement X of the workpiece 12—an elongate separation device 52 is provided upstream of the rotor head 14 and adjacent thereto. For reasons of simplification, this separating device 52 is always referred to below as a separating plate, without any restriction being understood therein.

The separating plate 52 adjoins the underside of the workpiece 12 with its upper edge 53 and extends from there essentially vertically downwards. With this arrangement of the baffle 52 , one side thereof faces the rotor head 14 . In this regard, it is significant that the means 42 for picking up or transporting away scale Z, in the present case in the form of a container 43 , are also arranged below the roller table 40 , namely on the side of the separating plate 52 which faces the rotor head 14 .

According to the embodiment just explained 12 the fact that the scale particles Z and the water are reflected from the underside of the workpiece 12 at different angles is used to separate scale and water on the underside of the workpiece 12 . On the one hand, the cinder particles Z fall, as in 12 correspondingly illustrated, after bouncing off the underside of the workpiece 12 almost vertically downwards, and with the help of the separating plate 52 reach or on its side, which faces or is opposite the rotor head 14, due to gravity into the container 43. In contrast, the water 18 ejected from the jet nozzles 16, when reflected from the underside of the workpiece 12, experiences a significantly larger horizontal component (in the illustration of 12 seen to the left, opposite to the direction of movement X of the workpiece 12), and as a result of a larger reflection angle it reaches the other side of the separating plate 52, which is opposite to the rotor head 14. In this way, the water reflected from the underside of the workpiece 12 can be selectively derived separately from the scale particles Z, e.g. B. directly to or in a separate water treatment plant 60 without getting into the sinter channel 54. This is in the 12 for simplification only symbolically symbolized by an arrow pointing to the left with the reference number "60".

In addition, for the embodiment of 12 it should be pointed out that a plurality of containers 43 can also be arranged below the roller table 40 and, in particular, can be moved or moved transversely to the roller table 40, in the same way as in the embodiment of FIG 6 already shown. In this respect, in order to avoid repetition, the explanations are allowed 6 to get expelled

The removed scale Z, which according to the invention is received in a container 43 in the above-mentioned embodiments, can then be fed to a sintering line for renewed steel production, taking into account that this collection, as explained, took place essentially free of oil.

For all of the above-mentioned embodiments of the device 10 it goes without saying that the fill level of a container 43 in relation to the scale Z removed therein can be detected by means of a sensor (not shown). This filling level information can be suitably transmitted to the control device 34, with which movement of the containers 43 below the roller table 40 is then suitably controlled or coordinated. If said sensor detects that a container 43 has been completely filled with scale Z, this container 43 is removed from the point at which it was below the baffle plate (cf. 6 ), of gap 48 (cf. 8 ) or the separating plate 52 (see. 12 ) is positioned, moved away and replaced with an empty container 43.

In the 13 1 shows, in a schematically simplified manner, the components of a water treatment plant 60 with which a method according to the present invention for treating the water originating from the descaling process with the device 10 can be carried out. The water treatment plant 60 includes a sinter well 62 which is connected to a sinter channel 54 via a line 72 . Downstream of the sinter well 62, the plant 60 has a so-called longitudinal clarifier 64 and then a filter 66, before the clarified water then enters a cold water basin 68, to which a cooling tower 70 is assigned. Another line 72 leads from the cold water basin 68 back to the device 10 in order to provide "fresh" water for the descaling which is carried out with the device 10 .

Pumps 74 are provided at various points in the lines 72, with which the aforementioned components of the system 60 are connected to one another, with which a conveyance of the water through the system 60 to the respective next treatment stage is ensured.

The water treatment plant 60 also includes grippers 63 which are arranged above the sinter well 62 and the longitudinal clarifier 64, respectively. By means of these grippers 63, it is possible to lift out either scale particles Z or other comparatively coarse dirt from the sinter well 62 or the longitudinal clarifier 64.

A characteristic feature of the water treatment plant 60 is that a return line 73 is provided, which in the device 10 is connected to the collecting pipe 46 (cf. 8 ) and/or to the left area of the partition plate 52 (cf. 12 ) is connected and either upstream of the Longitudinal clarifier 64 (or downstream of the sinter well 62) and/or upstream of the filter 66 (or downstream of the longitudinal clarifier 64) opens into the line system of the plant 60. Water that originates from the descaling process and does not get into the sintering channel 54 can be returned or introduced through the return line 73 essentially oil-free either downstream of the sintering well 62 or downstream of the longitudinal clarifier 64 into the plant 60 or fed directly to the cooling tower 70, so that the sinter well 62 or the longitudinal clarifier 64 is bypassed. It is also advantageous here that this water is already essentially free of scale particles Z, as a result of the separation of scale Z that has been removed and water, as explained on the basis of the above embodiments of the invention.

The separation of scale Z and water explained above, after the scale Z has been removed from a surface 20 of the workpiece 12, achieves the advantage on the one hand that the scale particles Z are directly available for reuse in the sintering line, and that on the other hand the water fraction, which is preferably fed to the water treatment plant 60 through the return line 73, has a lower load of scale or fat or oil. By relieving the cooling water treatment in this way, the quality of the treated water increases, e.g. in existing systems. In the case of new plants, this makes it possible to dimension the individual separation or treatment stages smaller.

The present invention ensures that scale Z, which has been removed from a surface 20 of the workpiece 12 by using a liquid 18 , is picked up separately from the sintering channel 54 by separate containers 43 below the roller table 40 . Since this eliminates the need to transport a mixture consisting of scale, water and oil/grease via washing away in the sintering channel 54, as in the prior art According to the invention, a water- and thus energy-saving descaling process is realized.

Reference List

10

contraption

12

workpiece

13

lateral edge (of the workpiece 12)

14

header element

14.1

rotor head assembly

14.2

rotor head assembly

16

jet nozzle(s)

17

nozzle mouth

18

liquid

19

Fluid

20

surface (of the workpiece 14)

22

collection device

23.1

lower baffle

23.2

top cover plate

24

margin (of the catcher)

25

bottom surface (of the collecting device 22)

30

rotor head modules

31

Rotor head module pair

32

Tinder selection device

34

control device

40

roller table

42

Means for picking up and/or removing scale

43

container

44

Opening (at a side edge 24 of the collecting element 22)

45

Baffle plate

46

manifold

48

gap

50

dividing element (e.g. plough)

51

tip (of the plow 50)

52

Separation device (e.g. partition plate)

53

upper edge (of the separation device 52)

54

sinter channel

60

water treatment plant

62

sinter well

63

gripper

64

longitudinal clarifier

66

filter

68

cold water pool

70

cooling tower

72

Pipes (of the waste water treatment plant 60)

73

return line

74

Pump)

a

angle of attack

δ

angle

g

angle

A

Distance (between the intersection of the axis of rotation R with the face of the head element 14 to the surface 20 of the workpiece 12)

D

pressurized water line

H

Height adjustability (for the head element 14)

L

Longitudinal axis (of jet nozzles 16)

M

central section (of the collecting element 22)

R

axis of rotation (of a rotor head 14)

S

spray direction

X

Direction of movement (of the workpiece 12 relative to the head element 14)

Z

tinder (or tinder particles)

Claims (20)

1. Device (10) for descaling a workpiece (12), preferably a hot-rolled product, comprising

   at least one head element (14) at which a plurality of jet nozzles (16) is mounted, wherein a liquid (18) in the form of water can be delivered from the jet nozzles (16) to the workpiece (12) at an angle (α) of incidence obliquely with respect to an orthogonal to a surface (20) of the workpiece (12), and

   a roller path (40) on which the workpiece (12) is movable in a movement direction (X) relative to the head element (14),

   characterised in that

   means (42) in the form of at least one container for receiving or transporting away scale (Z) which has been removed from a surface (20) of the workpiece (12) by the liquid (18) delivered from the jet nozzles (16) are arranged below the roller path (40) and

   a base region of the container is provided with drainage openings.
2. Device (10) according to claim 1, characterised in the means (42) for receiving or transporting away removed scale (Z) are formed by a plurality of containers (43) which are movable, in particular, transversely to the movement direction (X) of the workpiece (16).
3. Device (10) for descaling a workpiece (12), preferably a hot-rolled product, comprising

   at least one head element (14) at which a plurality of jet nozzles (16) is mounted, wherein a liquid (18), particularly water, can be delivered from the jet nozzles (16) to the workpiece (12) at an angle (α) of incidence obliquely with respect to an orthogonal to a surface (20) of the workpiece (12), and

   a roller path (40) on which the workpiece (12) is movable in a movement direction (X) relative to the head element (14),

   characterised in that

   means (42) in the form of a conveyor belt for receiving or transporting away scale (Z) which has been removed from a surface (20) of the workpiece (12) by the liquid (18) delivered from the jet nozzles (16) are arranged below the roller path (40).
4. Device (10) according to claim 3, characterised in that the conveyor belt circulates transversely to the movement direction (X) of the workpiece (16).
5. Device (10) according to any one of the preceding claims, characterised in that at least one head element (14) with jet nozzles (16) mounted thereon and a collecting device (22) are provided above the roller path (40), wherein the collecting device (22) is so arranged upstream of the head element (14) with respect to the movement direction (X) of the rolled product (16) that not only the water (18), which is delivered from the jet nozzles (16), after rebounding from the surface (20) of the workpiece (12), but also the scale (Z) removed from the surface (20) of the workpiece (12) by means of the liquid (18) are introducible in targeted manner into the collecting device (22).
6. Device (10) according to claim 5, characterised in that rinsing nozzles (28) through which a fluid (19) can be delivered, particularly under high pressure, transversely to the movement direction (X) of the rolled product (16) are provided within the collecting device (22), wherein the collecting device (22) has at at least one side edge (24) thereof an opening (44) through which removed scale (Z) can be discharged from the collecting device (22), wherein a collection pipeline (46) is arranged outside the collecting device (22) and adjacent to the opening (44) thereof and is so spaced from the opening (44) of the collecting device (22) that a gap (48), below which the means (42) for receiving or transporting away removed scale (Z) can be arranged, forms between this opening (44) and the collection pipeline (46).
7. Device (10) according to claim 6, characterised in that the collection pipeline (46) is connected with a separate water preparation installation (60).
8. Device (10) according to claim 6 or 7, characterised in that the rinsing nozzles (28) can be periodically switched on so that a fluid (19) can be delivered therefrom at intervals into the collecting device (22) in the direction of the opening (44) at the side edge thereof and transversely to the movement direction (X) of the workpiece (12).
9. Device (10) according to any one of claims 6 and 8, characterised in that a fluid (19) under high pressure can be delivered from the rinsing nozzles (28).
10. Device (10) according to any one of claims 5 to 9, characterised in that the collecting device (22) has at both sides thereof a respective opening through which removed scale can be discharged from the collecting device (22), wherein the collecting device (22) is equipped in a central section (M) with a dividing element (50) which divides the collecting device (22) into two regions (22.1, 22.2), wherein the dividing element (50) conducts the liquid (18), which is delivered from the jet nozzles (16), after rebounding from surface (20) of the workpiece (12) as well as the scale, which is removed from the surface (20) of the workpiece (12) by means of the liquid (18), into the two regions (22.1, 22.2) of the collecting device (22).
11. Device (10) according to claim 10, characterised in that the dividing element is constructed in the form of a plough (50), the point (51) of which faces in the direction of the head element (14).
12. Device (10) according to claim 11, characterised in that the rinsing nozzles (28) are each arranged in the shadow of the plough (50) and are each oriented in the direction of the openings (44) at a side edge (24) of the collecting device (22).
13. Device (10) according to any one of claims 5 to 12, characterised in that mechanical transport elements are arranged within the collecting device (22) and the collecting device (22) has an opening (44) at at least one side edge (24) thereof, wherein removed scale (Z) can be discharged from the collecting device (22) via the opening (44) by means of the mechanical transport elements, wherein the means (42) for receiving or transporting away removed scale (Z) can be arranged outside the collecting device (22) and adjacent to the opening thereof.
14. Device (10) according to any one of the preceding claims, characterised in that at least one head element (14) with jet nozzles (16) mounted thereon and - upstream of the head element (14) as seen in the movement direction (X) of the workpiece (12) and adjacent to the head element (14) - an elongate separation device (52) are provided below the roller path (40), wherein an upper edge (53) of the separation device (52) adjoins a lower side of the roller path (40) and the separation device (52) extends substantially perpendicularly downwardly starting from the lower side of the roller path (40), wherein the means (42) for receiving or transporting away removed scale (Z) are arranged at a side, which is opposite the head element (14), of the separation device (52).
15. Method of descaling a workpiece (12), preferably a hot-rolled product, which is moved on a roller path (40) in a movement direction (X) relative to a device (10) with at least one head element (14) on which a plurality of jet nozzles (16) is mounted, wherein a liquid (18) in the form of water is delivered from the jet nozzles (16) to the workpiece (12) at an angle (α) of incidence obliquely to the surface (20) of the workpiece (12),

    wherein scale (Z) which has been removed from a surface (20) of the workpiece (12) by the water (18) delivered from the jet nozzles (16) is transferred into or onto means (42) for receiving or transporting away the scale (Z), wherein these means (42) are arranged below the roller path (40),

    characterised in that the scale is drained on or in the means so that the scale is reusable without further preliminary treatment steps.
16. Method according to claim 15, characterised in that at least one head element (14) with jet nozzles (16) mounted thereon and a collecting device (22) are provided above the roller path (40), wherein the collecting device (22) is so arranged upstream of the head element (14) with respect to the movement direction (X) of the rolled product (16) that not only the water (18), which is delivered from the jet nozzles (16), after rebounding from the surface (20) of the workpiece (12), but also the scale (Z) removed from the surface (20) of the workpiece (12) by means of the liquid (18) are introduced into the collecting device (22) in targeted manner.
17. Method according to claim 16, characterised in that the collecting device (22) has an opening (44) at at least one side edge (24) thereof, wherein a collection pipeline (46) is arranged outside the collecting device (22) and adjacent to the opening (44) thereof and is so spaced from the opening (44) of the collecting device (22) that a gap (48) below which the means (42) for receiving or transporting away the removed scale (Z) are arranged forms between this opening (44) and the collection pipeline (46), wherein the removed scale (Z) is acted on within the collection device (22) by fluid (19) delivered, particularly under high pressure, from rinsing nozzles (28) and thereby is delivered through the opening (44), which is formed at the side edge (24) of the collecting device (22), in such a way that the scale (Z) drops downwardly through the gap (48) and the fluid (19), preferably in the form of water, flows away via the gap (48) and subsequently passes into the collection pipeline (46).
18. Method according to any one of claims 15 to 17, characterised in that scale (Z) which has been removed from a head element (14), which is arranged below the roller path (40), by jet nozzles (16) mounted thereon is subsequently conducted by means of a separation device (52), which is arranged below the roller path (40) and upstream of the head element (14) with respect to the movement direction (X) of the workpiece (12), onto or into the means (42) for receiving or transporting away removed scale (Z), wherein these means (42) are arranged at a side, which is opposite the head element (14), of the separation device (52).
19. Method according to claim 18, characterised in that the fluid preferably in the form of a liquid (18), which is delivered by the spray nozzles (16) of the head element (14) - which is arranged below the roller path (40) - in the direction of the surface (20) of the workpiece (12) and reflected therefrom, is conducted away at a side of the separation device (52) opposite the head element (14) and is preferably conducted into a separate water preparation plant (60).
20. Method according to any one of claims 15 to 19 or for water preparation during operation of a device (10) according to any one of claims 6 to 14, characterised in that the water which has been recovered above the roller path (40) by means of the collection pipeline (46) and/or below the roller path (40) by means of the separation device (52) is fed to a separate water preparation plant (60) connected with a sinter channel (54) associated with the device (10), wherein the water preparation plant (60) starting from the sinter channel (54) and in the sequence hereinafter stated comprises a sinter well (62), a longitudinal clarifier (64) and a filter (66), wherein the water originating from the descaling process is conducted into the duct system (72) of the water preparation plant (60) through a return duct (73) either downstream of the sinter well (62) or downstream of the longitudinal clarifier (64) or is fed directly to a cooling tower (70).

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