EP3914403B1 - Dispositif et procédé pour décalaminer une pièce en mouvement - Google Patents

Dispositif et procédé pour décalaminer une pièce en mouvement Download PDF

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Publication number
EP3914403B1
EP3914403B1 EP20700891.3A EP20700891A EP3914403B1 EP 3914403 B1 EP3914403 B1 EP 3914403B1 EP 20700891 A EP20700891 A EP 20700891A EP 3914403 B1 EP3914403 B1 EP 3914403B1
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EP
European Patent Office
Prior art keywords
workpiece
scale
collecting device
water
head element
Prior art date
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Active
Application number
EP20700891.3A
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German (de)
English (en)
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EP3914403A1 (fr
Inventor
Angela ANTE
Jens MARBURGER
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SMS Group GmbH
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SMS Group GmbH
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Publication of EP3914403A1 publication Critical patent/EP3914403A1/fr
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/04—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing
    • B21B45/06—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing of strip material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
    • B21B45/0269—Cleaning
    • B21B45/0275—Cleaning devices
    • B21B45/0278—Cleaning devices removing liquids

Definitions

  • 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.
  • a hot rolling mill descaler is an assembly used to remove scale, i. H. iron oxide impurities from the surface of the rolling stock.
  • a descaler 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • the nozzles for spraying out the fluid are fixed to a spray bar without rotating.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • a device 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.
  • drainage openings are provided in its bottom area.
  • the invention also provides a method for descaling a workpiece, preferably a hot-rolled product.
  • 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.
  • 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.
  • 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.
  • a head element in the form of a rotor head.
  • 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.
  • 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.
  • 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.
  • scale that has been removed from a surface on an upper side of the workpiece can be collected.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • a fluid preferably water
  • the flushing nozzles 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • mechanical transport elements can be arranged inside the collecting device, with the collecting device having an opening on at least one side edge thereof.
  • the collecting device having an opening on at least one side edge thereof.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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 .
  • 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.
  • 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.
  • 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.
  • 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.
  • 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 .
  • 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.
  • 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 ⁇ ( 1 ) between 15-45°.
  • the lower guide plate 23.1 is preferably attached in such a way that the angle ⁇ 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 ⁇ 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.
  • 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.
  • "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 .
  • 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.
  • the jet nozzles 16 are fixedly attached to an end face of the rotor head 14 opposite the workpiece 12 .
  • 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 ⁇ ( 2 ) arranged inclined.
  • This angle of attack ⁇ 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 ⁇ in the embodiment of 2 equal to the angle of inclination ⁇ of the axis of rotation R.
  • the rotor head 14 can be designed to be adjustable in height.
  • 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 )
  • This distance is within the meaning of the present invention A to be understood as the spray distance.
  • 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.
  • FIG 3 Further details for the device 10 according to the invention are in FIG 3 shown, namely in a fundamentally greatly simplified plan view.
  • 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.
  • 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 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.
  • 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 .
  • 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.
  • 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.
  • 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 .
  • a rotor module 30 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.
  • the width of such a rotor module 30 essentially corresponds to a width of the workpiece 12.
  • 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.
  • 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.
  • a rotor head e.g. rotor head 14.2 according to 4
  • 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 .
  • 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 .
  • a rotor head 14 is also connected to the control device 34 in terms of signals.
  • the control device 34 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.
  • 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.
  • 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.
  • 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.
  • FIG 12 shows a cross-sectional view of the catcher 22 taken across a width of (in figure 5 not shown) roller table 40.
  • a bottom surface 25 of the collecting device 22 is formed substantially horizontally.
  • 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.
  • FIG. 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 .
  • 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.
  • 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.
  • a fluid 19 preferably water under high pressure
  • 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 are expediently formed in a bottom region of the container 43, through which water (but not scale) can escape downwards.
  • 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.
  • 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.
  • a manifold 46 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.
  • FIGs 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.
  • 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.
  • flushing nozzles 28 are provided, from which a fluid 19, preferably water under pressure, is discharged in the direction of the openings 44.
  • 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.
  • 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.
  • 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 .
  • 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 .
  • 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 .
  • 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.
  • 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".
  • 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.
  • 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.
  • 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 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.

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Claims (20)

  1. Dispositif (10) de décalaminage d'une pièce à traiter (12), de préférence d'une pièce laminée à chaud qui comprend
    au minimum un élément de tête (14) auquel sont attachés plusieurs buses de pulvérisation (16), dans lequel un liquide (18) sous forme d'eau est pulvérisé à travers par des buses de pulvérisation (16) sur la pièce à traiter (12) selon un angle d'incidence (α) oblique par rapport à une orthogonale à une surface (20) de la pièce à traiter (12), et
    un banc à rouleaux (40) sur lequel la pièce à traiter (12) peut être déplacée dans une direction de déplacement (X) par rapport à l'élément de tête (14), caractérisé
    en ce que sous le banc à rouleaux (40) sont disposés des moyens (42) sous la forme d'au moins un conteneur qui sert à collecter ou à transporter la calamine (Z) qui a été enlevée d'une surface (20) de la pièce à traiter (12) par le liquide (18) appliqué par les buses de pulvérisation (16) et en ce qu'une zone inférieure du conteneur est prévue d'orifices de sortie de l'eau.
  2. Dispositif (10) selon la revendication 1, caractérisé en ce que les moyens (42) de collecte ou de transport de la calamine enlevée (Z) comprennent plusieurs conteneurs (43) amovibles, notamment transversalement par rapport à la direction de déplacement (X) de la pièce à traiter (16).
  3. Dispositif (10) de décalaminage d'une pièce à traiter (12), de préférence d'une pièce laminée à chaud qui comprend
    au minimum un élément de tête (14) auquel sont attachées plusieurs buses de pulvérisation (16), dans lequel un liquide (18), notamment de l'eau, est pulvérisé par les buses de pulvérisation (16) sur la pièce à traiter (12) selon un angle d'incidence (α) des buses de pulvérisation (16) obliquement par rapport à une ligne orthogonale sur une surface (20) de la pièce à traiter (12), et
    un banc à rouleaux (40) sur lequel la pièce à traiter (12) peut être déplacée dans une direction de déplacement (X) par rapport à l'élément de tête (14), caractérisé
    en ce que sous le banc à rouleaux (40) sont disposés des moyens (42) sous la forme d'un convoyeur à rouleaux pour collecter ou transporter la calamine (Z) qui a été enlevée d'une surface (20) de la pièce à traiter (12) par le liquide (18) expulsé par les buses de pulvérisation (16).
  4. Dispositif (10) selon la revendication 3, caractérisé en ce que le convoyeur à rouleaux se déplace transversalement par rapport à la direction de déplacement (X) de la pièce à traiter (16).
  5. Dispositif (10) selon l'une des revendications précédentes, caractérisé en ce qu'au-dessus du banc à rouleaux (40) sont prévus au minimum un élément de tête (14) avec des buses de pulvérisation (16) attachés à celui-ci et un dispositif collecteur (22), le dispositif collecteur étant disposé en amont de l'élément de tête (14) par rapport à la direction de déplacement (X) du matériau laminé (16), de sorte que l'eau (18) expulsée des buses de pulvérisation (16) après avoir ricoché sur la surface (20) de la pièce à traiter (12), ainsi que la calamine (Z) enlevée de la surface (20) de la pièce à traiter (12) à l'aide du liquide (18) puissent être transférées de façon dirigée vers le dispositif collecteur (22).
  6. Dispositif (10) selon la revendication 5, caractérisé en ce qu'à l'intérieur du dispositif collecteur (22) sont prévues des buses de lavage (28) à travers lesquelles un fluide (19) peut être évacué transversalement par rapport à la direction de déplacement (X) du matériau laminé (16), notamment à haute pression, le dispositif collecteur (22) présentant une ouverture (44) sur au moins un de ses côtés latéraux (24), ouverture (44) par laquelle il est possible d'évacuer du dispositif collecteur (22) la calamine enlevée (Z), dans lequel un tuyau collecteur (46) est disposé à l'extérieur du dispositif collecteur (22) et de manière adjacente à son ouverture (44), le tuyau collecteur (46) étant distancé de l'ouverture (44) du dispositif collecteur (22) de sorte qu'entre cette ouverture (44) et le tuyau collecteur (46) se crée un espace (48), sous lequel puisse être disposé les moyen (42) de collecte ou d'évacuation par transportation de la calamine enlevée (Z).
  7. Dispositif (10) selon la revendication 6, caractérisé en ce que le tuyau collecteur (46) est relié à une installation séparée de traitement des eaux (60).
  8. Dispositif (10) selon la revendication 6 ou 7, caractérisé en ce que les buses de lavage (28) peuvent être mises en marche périodiquement de sorte qu'un liquide (19) puisse être évacué régulièrement de celles-ci dans le dispositif collecteur (22) dans la direction d'ouverture (44) sur son côté latéral et transversalement par rapport à la direction de déplacement (X) de la pièce à traiter (12).
  9. Dispositif (10) selon l'une des revendications 6 à 8, caractérisé en ce qu'un fluide (19) peut être évacué des buses de lavage (28) à haute pression.
  10. Dispositif (10) selon l'une des revendications 5 à 9, caractérisé en ce que le dispositif collecteur (22) présente sur ses deux côtés une ouverture pour évacuer la calamine enlevée du dispositif collecteur (22), où le dispositif collecteur (22) est prévu dans une section centrale (M) d'un élément diviseur (50), qui sépare le dispositif collecteur (22) en deux sections (22.1, 22.2),où l'élément diviseur (50) guide le liquide (18) évacué par les buses de pulvérisation (16) après avoir ricoché sur la surface (20) de la pièce (12), ainsi que la calaminé enlevée de la surface (20) de la pièce (12) à l'aide du liquide (18) dans les deux sections (22.1, 22.2) du dispositif collecteur (22).
  11. Dispositif (10) selon la revendication 10, caractérisé en ce que l'élément diviseur a la forme d'une charrue (50) dont la pointe (51) est orientée vers l'élément de tête (14).
  12. Dispositif (10) selon la revendication 11, caractérisé en ce que les buses de lavage (28) sont disposées chacune à l'ombre de la charrue (50) et sont alignées chacune dans la direction des ouvertures (44) sur un côté latéral (24) du dispositif collecteur (22).
  13. Dispositif (10) selon l'une des revendications 5 à 12, caractérisé en ce que des éléments mécaniques de transport sont disposés à l'intérieur du dispositif collecteur (22) et le dispositif collecteur (22) présente une ouverture (44) sur au moins un de ses côté latéraux (24), où la calamine enlevée (Z) peut être évacuée du dispositif collecteur (22) par l'ouverture (44) au biais des éléments mécaniques de transport, où les moyens (42) pour collecter ou transporter la calamine enlevée (Z)) peuvent être disposés à l'extérieur du dispositif collecteur (22) et de manière adjacente à son ouverture.
  14. Dispositif (10) selon l'une des revendications précédentes, caractérisé en ce qu'en dessous du banc à rouleaux (40) sont prévus au minimum un élément de tête (14) avec des buses de pulvérisation (16) fixées à celui-ci et - regardé dans le sens de déplacement (X) de la pièce à traiter (12) - en amont de l'élément de tête (14) et de manière adjacente à celui-ci, un dispositif de séparation (52) allongé, dans lequel un bord supérieur (53) du dispositif de séparation (52) est contigu à un côté inférieur du banc à rouleaux (40) et le dispositif de séparation (52) s'étend notamment vers la section inférieure, en partant de la partie inférieure du banc à rouleaux (40), où les moyens (42) de collecte ou de transport de la calamine enlevée (Z) sont disposés sur un côté du dispositif de séparation (52) qui est orienté vers la direction opposé de l'élément de tête (14).
  15. Procédé de décalaminage d'une pièce à traiter (12), de préférence une pièce laminée à chaud, qui est déplacée sur un banc à rouleaux (40) dans une direction de déplacement (X) par rapport à un dispositif (10) comportant au minimum un élément de tête (14) auquel sont attachées plusieurs buses de pulvérisation (16), un liquide (18) sous forme d'eau étant évacué par les buses de pulvérisation (16) sur la pièce à traiter (12) selon un angle d'incidence (α) oblique par rapport à la surface (20) de la pièce (12),
    où la calamine (Z), qui a été enlevée d'une surface (20) de la pièce à traiter (12) par l'eau (18) évacuée par les buses de pulvérisation (16), est transférée vers ou sur un moyen (42) de collecte ou de transport de la calamine (Z), ledit moyen (42) étant disposé sous le banc à rouleaux (40), caractérisé en ce que la calamine est déshydratée sur ou dans ces moyens, de sorte que la calamine puisse être réutilisée sans d'autres étapes de prétraitement.
  16. Procédé selon la revendication 15, caractérisé en ce qu'au-dessus du banc à rouleaux (40) sont prévus au minimum un élément de tête (14) avec des buses de pulvérisation (16) attachés à celui-ci et un dispositif collecteur (22), le dispositif collecteur étant disposé en amont de l'élément de tête (14) par rapport à la direction de déplacement (X) du matériau laminé (16), de sorte que l'eau (18) expulsée des buses de pulvérisation (16) après avoir ricoché sur la surface (20) de la pièce à traiter (12), ainsi que la calamine (Z) enlevée de la surface (20) de la pièce à traiter (12) à l'aide du liquide (18) puissent être acheminées de façon dirigée dans le dispositif collecteur (22).
  17. Procédé selon la revendication 16, caractérisé en ce que le dispositif collecteur (22) présente une ouverture (44) sur au minimum un de ses côté latéraux (24), où un tuyau collecteur (46) est disposé à l'extérieur du dispositif collecteur (22) et de manière adjacente à son ouverture (44), lequel est distancé de l'ouverture (44) du dispositif collecteur (22) de sorte qu'entre cette ouverture (44) et le tuyau collecteur (46) soit créé un espace (48) sous lequel sont disposés les moyens (42) de collecte ou de transport de la calamine enlevée (Z), où la calamine enlevée (Z) est exposée à l'intérieur du dispositif collecteur (22) au fluide (19) évacué notamment à haute pression par les buses de lavage (28) et est ainsi évacuée par l'ouverture (44) créée au niveau du bord latéral (24) du dispositif collecteur (22), de sorte que la calamine (Z) tombe à travers l'espace (48) et le liquide (19), de préférence sous forme d'eau, s'écoule à travers l'espace (48) et atteint ultérieurement le tuyau collecteur (46).
  18. Procédé selon l'une des revendications 15 à 17, caractérisé en ce que la calamine (Z), qui a été enlevée par un élément de tête (14) disposé sous le banc à rouleaux (40) et sur lequel sont montées des buses de pulvérisation (16), est stockée ultérieurement au moyen d'un dispositif de séparation (52), qui est positionné sous le banc à rouleaux (40) et en amont de l'élément de tête (14) par rapport à la direction de déplacement (X) de la pièce à traiter (12), sur ou dans les moyens (42) de collecte ou de transport de la calamine enlevée (Z), ces moyens (42) étant disposés sur une partie du dispositif de séparation (52) qui est orienté dans le sens opposé par rapport à l'élément de tête (14).
  19. Procédé selon la revendication 18, caractérisé en ce que le fluide, de préférence sous la forme d'un liquide (18) évacué par les buses de pulvérisation (16) de l'élément de tête (14) disposé sous le banc à rouleaux (40) dans le sens de la surface (20) de la pièce à traiter (12) et reflété par celle-ci, est évacué sur un côté du dispositif de séparation (52) opposé à l'élément de tête (14) et est de préférence introduit dans une installation séparée de traitement des eaux (60).
  20. Procédé selon l'une des revendications 15 à 19 ou de traitement des eaux pendant le fonctionnement d'un dispositif (10) selon l'une des revendications 6 à 14, caractérisé en ce que l'eau obtenue au-dessus du banc à rouleaux (40) par le tuyau collecteur (46) et/ou sous le banc à rouleaux (40) par le dispositif de séparation (52) est acheminée dans une installation séparée de traitement des eaux (60) reliée à un bac de frittage (54) associée au dispositif (10), l'installation de traitement des eaux (60) comprenant, à partir du bac de frittage (54) et dans l'ordre mentionné ci-dessous, un puits de frittage (62), un système de filtration longitudinale (64) et un filtre (66), dans lequel l'eau récupérée qui provient du processus de décalaminage est introduite dans le système de tuyauterie (72) de l'installation de traitement des eaux (60) par une conduite de recirculation (73), soit en aval du puits de frittage (62), soit en aval du système de filtration longitudinal (64), ou est acheminée directement vers une tour de refroidissement (70).
EP20700891.3A 2019-01-22 2020-01-15 Dispositif et procédé pour décalaminer une pièce en mouvement Active EP3914403B1 (fr)

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DE102019200760.0A DE102019200760A1 (de) 2019-01-22 2019-01-22 Vorrichtung und Verfahren zum Entzundern eines bewegten Werkstücks
PCT/EP2020/050876 WO2020152003A1 (fr) 2019-01-22 2020-01-15 Dispositif et procédé pour décalaminer une pièce en mouvement

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Publication number Priority date Publication date Assignee Title
DE4115819A1 (de) * 1991-05-15 1992-11-19 Schloemann Siemag Ag Verfahren zur aufbereitung von in walzwerksanlagen benutzten kuehl- und/oder schmiermitteln und hierzu eine aufbereitungsanlage
AUPM826394A0 (en) * 1994-09-20 1994-10-13 Bhp Steel (Jla) Pty Limited Descaling metal strip
DE19817002A1 (de) * 1998-04-17 1999-10-21 Schloemann Siemag Ag Einrichtung zum Entzundern von Halbzeugen
ES2289488T3 (es) 2004-02-27 2008-02-01 Hermetik Hydraulik Ab Dispositivo hidraulico para descascarillar material laminado caliente.
DE102005014877A1 (de) 2005-03-30 2006-10-05 Sms Demag Ag Verfahren und Vorrichtung zum Entzundern von Oberflächen von Brammen, Bändern oder dergleichen
KR101353693B1 (ko) * 2011-12-08 2014-01-20 주식회사 포스코 강판의 표면 처리장치
DE102016217561A1 (de) 2016-03-18 2017-09-21 Sms Group Gmbh Vorrichtung und Verfahren zum Entzundern eines bewegten Werkstücks
DE102016223131A1 (de) * 2016-09-06 2018-03-08 Sms Group Gmbh Vorrichtung und Verfahren zum Aufbringen eines flüssigen Mediums auf eine Walze und/oder auf ein Walzgut und/oder zum Entfernen des flüssigen Mediums

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