Device and method for pickling at least one steel wire and / or strip in continuous motion

Abstract

The invention relates to a device for pickling at least one steel wire and / or strip (1) in continuous motion, comprising: - means for moving at least one wire and / or strip (1) in a direction of motion (2); and - at least one pickling bath (3) filled with pickling liquor and comprising a bath entry (4) for the entry of at least one wire and / or strip (1) into the bath (3) and a bath exit (5) for the exit of at least one wire and / or strip (1) from the bath (3), between which entry and exit a pickling zone is located. The device is characterised in that it further includes: - a series of means (6) for spraying pickling liquor into the bath (3), the means comprising a pickling liquor inlet (7) in fluid communication with a pickling liquor source and in fluid communication with a substantially horizontal distribution line (8) submerged in the pickling liquor, the distribution line (8) having a longitudinal direction and being in fluid communication with at least two outlet lines (9), each outlet line (9) also having a longitudinal direction and being arranged so as to form a projecting angle α in the horizontal plane running from the longitudinal direction of the distribution line (8) to the longitudinal direction of the outlet line (9), the projecting angle α being between 45° and 135°, each outlet line (9) comprising at least one outlet (10) into the pickling bath (3), the outlet being submerged in the pickling liquor and arranged to spray at least one jet (14) of pickling liquor in a spraying direction, the series of means (6) for spraying pickling liquor comprising a first spraying means (11), N intermediate spraying means (12) and a last spraying means (13), the jet (14) of pickling liquor from at least one outlet (10) of the first spraying means (11) having a first spraying direction, the jet (14) of pickling liquor from at least one outlet (10) of an nth intermediate spraying means (12) having an nth spraying direction, the jet (14) of pickling liquor from at least

Description

[0001] DEVICE AND METHOD FOR PICKLING AT LEAST ONE STEEL WIRE AND / OR RIBBON BY CONTINUOUS FOLDING

[0002] The present invention relates to a device for stripping at least one steel wire and / or ribbon in continuous motion.

[0003] Pickling baths for wires and / or ribbons moving through galvanizing devices have been known for a long time, allowing an impeccable finished product to be obtained.

[0004] The pickling stage primarily removes impurities from the surface of the wires and / or tapes to be galvanized, such as oxides, rust, or other metallic residues accumulated during previous manufacturing stages. This pickling is carried out using an acidic pickling solution, which reacts chemically with these impurities to dissolve and effectively remove them from the surface of the wires and / or tapes.

[0005] Impurities can accumulate on the surface of metal wires or ribbons due to the thermal, mechanical, or chemical processes they have undergone. Without effective pickling, these contaminants, such as oxides or rust, can compromise the adhesion of the coating applied during galvanizing. Poor adhesion can lead to premature corrosion, uneven coverage, or even coating detachment. This pickling step is therefore essential to guarantee the quality, durability, and corrosion resistance of the finished product.

[0006] There are pickling devices for metal strips where the pickling bath is mostly divided into two parts by the strip being treated. The main challenge with these devices is to ensure homogeneous pickling of the entire surface of the strip on both sides.

[0007] There are also pickling devices for moving wires and / or metal ribbons, where the wires and / or ribbons pass through the pickling bath at a certain speed, carrying with them a film of acidic liquor that creates a boundary layer of liquor around the wires and / or ribbons, preventing them from coming into contact with the reactive acid. The major challenge with these pickling devices for wires and / or ribbons is ensuring the breaching of this boundary layer to allow the reactive acid to come into contact with the metallic elements and guarantee their effective pickling. The present invention relates to the pickling technology for moving wires and / or ribbons.

[0008] The present invention relates more particularly to a device for stripping at least one continuously moving steel wire and / or ribbon, comprising:

[0009] Means of training at least one wire and / or ribbon in a scrolling direction,

[0010] At least one pickling bath filled with pickling liquor comprising a bath inlet of said at least one wire and / or ribbon into said bath and a bath outlet of said at least one wire and / or ribbon from said bath, between which is a pickling zone.

[0011] Such a device for stripping at least one continuously moving steel wire and / or tape is well known in the prior art, as described in BEI document 015255. This document describes a stripping device comprising a stripping solution bath through which the wires and / or tapes move. The moving wires and / or tapes pass through this bath by means of turbulent currents flowing in a direction transverse to the direction of movement, and which are generated by means for forming turbulent currents. These turbulent currents enable the rupture of the boundary layer surrounding the moving wires and / or tapes.

[0012] Unfortunately, although the device described in document BEI 015255 presents certain solutions for the pickling of continuously moving wires and / or tapes, these solutions are not sufficient for current galvanizing devices where the speed of moving wires and / or tapes is constantly increasing and where the speed of moving juxtaposed wires and / or tapes is not necessarily the same.

[0013] Indeed, increasing the speed of the moving wires and / or ribbons makes it more difficult to ensure effective breaching of the boundary layer surrounding them, as the contact time between the wires / ribbons and the turbulent currents is reduced. This can lead to decreased pickling efficiency and, consequently, a decrease in the quality of subsequent treatment during galvanizing. Furthermore, when the moving wires and / or ribbons have different speeds, it is essential to ensure consistent treatment quality for each.

[0014] The invention aims to address these technological challenges and to at least partially overcome the aforementioned disadvantages by providing a stripping device for at least one continuously moving steel wire and / or ribbon which is both simple and effective for stripping wires and / or ribbons moving at high and / or different speeds.

[0015] To solve this problem, the invention provides a device for stripping at least one continuously moving steel wire and / or ribbon as indicated at the beginning, which includes a series of means for projecting stripping liquid into said bath, comprising a stripping liquid inlet in fluidic communication with a stripping liquid source and in fluidic communication with a substantially horizontal distribution conduit immersed in the stripping liquid, said distribution conduit having a longitudinal direction and being in fluidic communication with at least 2 outlet conduits, each outlet conduit also having a longitudinal direction and being arranged so as to form a salient angle α in the horizontal plane going from the longitudinal direction of said distribution conduit to the longitudinal direction of said outlet conduit, said salient angle α being between 45° and 135°, more particularly between 60° and 120°,even more particularly between 80° and 100°, each outlet conduit comprising at least one outlet on said pickling bath, immersed in the pickling liquid and arranged to project at least one jet of pickling liquid in a projection direction, said series of pickling liquid projection means comprising a first projection means, N intermediate projection means and a final projection means, said pickling liquid jet from at least one outlet of said first projection means having a first projection direction, said pickling liquid jet from at least one outlet of an n, ième intermediate projection means presenting an n ième projection direction, said pickling liquid jet from at least one outlet of said last projection means presenting a last projection direction, said first, n ième and the final projection directions are each different from each other.

[0016] As can be seen, the device according to the present invention comprises means for driving at least one steel wire and / or ribbon through a pickling bath filled with pickling solution. The device includes at least three means for projecting pickling solution into said bath, enabling the continuous projection of pickling solution jets at various locations within the bath. This maintains a sufficiently high turbulence level in the bath to break the boundary layer of pickling solution on the surface of the wires and / or ribbons, and to ensure continuous renewal of the acid in direct contact with the wire and / or ribbon, thus ensuring proper pickling, even for wires and / or ribbons moving at high and / or different speeds.

[0017] Indeed, the presence of at least three means for projecting the pickling solution according to the present invention, whose outlets project jets in at least three different directions from a horizontal plane, ensures the formation of significant turbulence. This ability to direct the jets in various directions generates a high rate of uniform turbulence throughout the bath, optimizing the impact of the turbulence on the surface of the moving wires and / or ribbons and therefore on the boundary layer, thus ensuring the rupture of this boundary layer and effective pickling.

[0018] In fact, even when the wires and / or ribbons pass at high speeds and therefore the contact time between these elements and the pickling liquid is reduced, the significant turbulence, generated by the jets projected in at least 3 different directions from a horizontal plane, ensures the effective pickling of the wires and / or ribbons.

[0019] Furthermore, these different orientations, which create a high level of turbulence in the bath, allow for the processing of a wide range of wires and / or ribbons, even if their speed or diameter varies. Consequently, the device ensures efficient and homogeneous removal of impurities that could compromise coating adhesion during galvanizing, even for different wires and / or ribbons moving at different speeds, thus guaranteeing consistent treatment quality for each.

[0020] The wires and / or ribbons in motion are defined by their speed characteristic. In the case of wires, the speed characteristic is itself defined by the quantity Dv, which is the product of the wire diameter D and its speed v. In the case of ribbons in motion, the speed characteristic is defined by the ribbon's speed v.

[0021] Furthermore, the multidirectional jet orientation helps reduce dead zones or stagnant pockets in the pickling bath, where impurities could accumulate, thus preventing the formation of concentration gradients in the pickled impurities or pickling liquor. This multidirectional jet orientation eliminates the need for additional obstacles or complexities in the bath's internal structure, simplifying maintenance and reducing operating costs. This design also ensures high turbulence within the pickling bath while controlling the pressure losses created by these multidirectional jets.

[0022] Furthermore, each pickling liquor inlet is in fluidic communication with at least two outlet lines via a distribution line. This configuration significantly simplifies the bath structure, as the bath walls require fewer modifications compared to a bath where each pickling liquor inlet would be connected to a single outlet line to achieve the same turbulence ratio. In the latter case, it would be necessary to modify the walls to double the number of pickling liquor inlets, resulting in additional costs and more complex maintenance.

[0023] Preferably, in the pickling device according to the invention, the pickling liquor comprises water and / or hydrochloric acid and / or sulfuric acid and / or nitric acid and / or hydrofluoric acid or a mixture thereof.

[0024] Advantageously, said first projection means is positioned in said pickling bath at said bath inlet, said at least 2 outlet conduits of said first projection means extend from said distributor conduit in said direction of flow, said at least one outlet of said at least 2 outlet conduits being arranged to project at least one jet of pickling liquid in said direction of flow.

[0025] Equally advantageously, said salient angle a going from the longitudinal direction of said distributing conduit to the longitudinal direction of said outlet conduit of said first projection means is between 60° and 120°, more particularly between 80° and 100°, even more particularly between 85° and 95°.

[0026] Advantageously, said last projection means is positioned in said pickling bath at said bath outlet, said at least 2 outlet conduits of said last projection extend from said distributor conduit in a direction opposite to said direction of flow, said at least one outlet of said at least 2 outlet conduits being arranged to project at least one jet of pickling liquid in a direction opposite to said direction of flow.

[0027] Equally advantageously, said salient angle a going from the longitudinal direction of said distributing conduit to the longitudinal direction of said outlet conduit of said last projection means is between 60° and 120°, more particularly between 80° and 100°, even more particularly between 85° and 95°.

[0028] The positioning and structure of the first and last spray nozzles direct the pickling fluid jets into the pickling bath, increasing the turbulence within it. Furthermore, this prevents excessive loss of pickling fluid overflowing at the bath inlet and outlet, maintaining a sufficient level of pickling fluid in the bath.

[0029] In a particular embodiment, said N intermediate projection means are positioned in said stripping zone.

[0030] In a further more particular embodiment, said at least 2 outlet conduits of each intermediate projection means of said N intermediate projection means extend from said distribution conduit and comprise a first outlet conduit and a second outlet conduit, each provided with said outlet, the outlet of said first outlet conduit being arranged to project a first jet of pickling liquid in a primary projection direction, the outlet of said second outlet conduit being arranged to project a second jet of pickling liquid in a secondary projection direction, said primary projection direction and said secondary projection direction being countercurrent to each other.

[0031] The term "counter-current to each other" means that the primary and secondary projection directions can be oriented antiparallel, i.e., opposite to each other, or form an angle other than 180° between them, indicating that the primary and secondary projection directions are not parallel but deviated from each other. In the latter case, the projection directions must be arranged such that the primary projection direction is oriented to one side of the longitudinal direction of the distribution conduit and the secondary projection direction to the other side in a horizontal plane, so that they are not both directed to the same side of the longitudinal direction of the distribution conduit of an intermediate projection means.

[0032] In such a particular form of realization, N is between 1 and 20.

[0033] In an even more particular embodiment, the lower limit of N is 2, more specifically 3.

[0034] In a similarly particular embodiment, the upper limit of N is 19, more specifically 18.

[0035] For example, a bath with a length of 4 m includes 3 projection means, of which 1 is an intermediate projection means. For example, a bath with a length of 10 m includes 9 projection means, of which 7 are intermediate projection means.

[0036] Preferably, N is between 2 and 1, preferably between 3 and 18, and a first intermediate projection means and a second intermediate projection means adjacent to said first intermediate projection means are provided and each comprise a first and a second outlet conduit, said first and said second intermediate projection means being positioned such that said first outlet conduit of said second intermediate projection means is the outlet conduit closest to said first outlet conduit of the first intermediate projection means and such that said primary projection direction of said first intermediate projection means is counter-current to said primary projection direction of said second intermediate projection means.

[0037] Preferably, said first intermediate projection means and said second intermediate projection means are positioned such that said secondary projection direction of said first intermediate projection means is against said secondary projection direction of said second intermediate projection means.

[0038] The positioning and structure of the N intermediate projection means maximize the turbulence rate in the pickling bath. Indeed, the counter-current orientation of the primary and secondary projection directions for the same intermediate projection means, as well as the specific orientations of the outlet ducts of a first intermediate projection means and a second intermediate projection means adjacent to the first, mean that different liquid jets from different outlets meet and interact with each other, or meet after bouncing off the lateral walls of the pickling bath, thus creating areas of increased turbulence in the pickling bath.This configuration not only improves the homogeneity of the treatment on the surface of the parts to be pickled, but also optimizes the efficiency of the process by reducing stagnation areas and increasing the renewal of the liquor in contact with the treated surfaces.

[0039] It is envisaged that the distribution conduit may be arranged perpendicular to the direction of travel of at least one wire and / or tape. In this configuration, preferably, the salient angle α from the longitudinal direction of the distribution conduit to the longitudinal direction of the outlet conduit is not 90°. Conversely, when the distribution conduit is not perpendicular to said direction of travel, the salient angle α is preferably equal to 90°.

[0040] Advantageously, said fluidic communication between said pickling liquor inlet and said distribution conduit is located between said at least 2 outlet conduits in fluidic communication with said distribution conduit.

[0041] Advantageously, said outlets are flattened outlet fittings whose end in contact with the pickling liquid contained in said pickling bath is in the form of a slot, preferably a horizontal slot.

[0042] In one variant, the fitting has a wall at one end in contact with the pickling liquid contained in the pickling bath which has an outlet orifice, the outlet orifice being a slot, a circular orifice, a square orifice, a hexagonal orifice, or any other equivalent shape.

[0043] More advantageously, the pickling device further includes a water supply, a distributor in fluidic communication with said water supply and equipped with outlet ports, arranged upstream of the pickling bath and arranged to form an inlet water curtain, and means for collecting water from said curtain arranged outside said bath.

[0044] Equally advantageously, the pickling device further includes a water supply, a distributor in fluidic communication with said water supply and equipped with outlet ports, arranged downstream of the pickling bath and arranged to form an outlet water curtain, and means for collecting water from said curtain arranged outside said bath.

[0045] The presence of an inlet water curtain upstream of the bath and an outlet water curtain downstream of the bath helps to contain acid vapors in the pickling device and to prevent pollution of the environment of the device.

[0046] The said water supply for the inlet water curtain and the outlet water curtain may be separate or common.

[0047] The water collection means for the inlet and outlet water curtains may be separate or combined. Furthermore, these water collection means may be located upstream of the bath, downstream of the bath, or below the pickling bath.

[0048] Advantageously, when the stripping of wires and / or ribbons is carried out by passing them through a first stripping bath, then through a second stripping bath juxtaposed to the first, an inlet water curtain is placed upstream of the first stripping bath and an outlet water curtain is placed downstream of the second bath.

[0049] Preferably, the said pickling liquor source is equipped with heating means.

[0050] Other embodiments of the device for stripping at least one wire and / or ribbon of steel in continuous scrolling according to the invention are indicated in the attached claims.

[0051] The invention also relates to a method for stripping at least one continuously moving steel wire and / or ribbon, implementing the device for stripping at least one continuously moving steel wire and / or ribbon according to the invention.

[0052] Other embodiments of the stripping process of at least one continuous-flowing steel wire and / or ribbon according to the invention are indicated in the attached claims.

[0053] The invention also relates to a method for pickling at least one steel wire and / or ribbon in continuous motion, in which at least one wire and / or ribbon is driven by drive means through a pickling bath filled with pickling liquid, to which a turbulent flow is imparted by jets of pickling liquid from a series of pickling liquid projection means comprising a first projection means, N intermediate projection means and a final projection means, N being between 1 and 20, preferably between 2 and 1, even more preferably between 3 and 18, each pickling liquid projection means of said series of pickling liquid projection means comprising a pickling liquid inlet in fluidic communication with a pickling liquid source and in fluidic communication with a substantially horizontal distribution conduit immersed in the pickling liquid,said distributing conduit having a longitudinal direction and being in fluidic communication with at least two outlet conduits, each outlet conduit also having a longitudinal direction and being arranged so as to form a salient angle α in the horizontal plane going from the longitudinal direction of said distributing conduit to the longitudinal direction of said outlet conduit, said salient angle α being between 45° and 135°, more particularly between 60° and 120°, and even more particularly between 80° and 100°, each outlet conduit comprising at least one outlet onto said pickling bath, immersed in the pickling liquid. Preferably, said at least one wire and / or ribbon passes through an inlet water curtain upstream of said pickling bath.

[0054] Preferably, said at least one thread and / or ribbon passes through an outlet water curtain downstream of said pickling bath.

[0055] In a particularly preferred embodiment, each wire and / or ribbon in motion has a motion characteristic, said motion characteristic being defined by a quantity Dv between 100 and 400 mm.m / min for wires in motion, said motion characteristic being different or identical for each wire and / or ribbon in motion.

[0056] In a particularly preferred embodiment, each thread and / or ribbon in motion has a scrolling characteristic, said scrolling characteristic being defined by a scrolling speed v between 5 and 30 m / min for scrolling ribbons, said scrolling characteristic being different or identical for each thread and / or ribbon in motion.

[0057] Other embodiments of the stripping process of at least one continuous-flowing steel wire and / or ribbon according to the invention are indicated in the attached claims.

[0058] Other features, details and advantages of the invention will become apparent from the description given below, by way of non-limitation and with reference to the drawings and examples.

[0059] In the drawings, figure 1 is a perspective top view of a central part of a device for stripping at least one continuously moving steel wire and / or ribbon, showing the intermediate projection means.

[0060] Figure 2 is a perspective top view of the exit of a stripping device of at least one continuously moving steel wire and / or ribbon, showing the final projection means.

[0061] Figure 3 is an embodiment of Figure 1 where at least one outlet includes a "y" shaped fitting on each outlet conduit.

[0062] Figure 4 is an embodiment of Figure 2 where at least one outlet includes a "y" shaped fitting on each outlet conduit.

[0063] Figure 5 is a schematic top view of the stripping device according to the invention.

[0064] Figures 6 to 11 are top views of different embodiments of the intermediate projection means. In the figures, identical or analogous elements bear the same reference numerals.

[0065] Figure 5 shows the device for pickling at least one continuously moving steel wire and / or ribbon according to the present invention, comprising a pickling bath 3 filled with pickling liquid, said bath 3 having a bath inlet 4 and a bath outlet 5 at its ends. Between the bath inlet 4 and the bath outlet 5 is a pickling zone C.

[0066] The pickling bath 3 is traversed by passing steel wires and / or ribbons 1, where each wire and / or ribbon 1 has a passing characteristic. This passing characteristic is defined by a quantity Dv between 100 and 400 mm·m / min for passing wires or by a passing speed v between 5 and 30 m / min for passing ribbons. This passing characteristic may be different or the same for each passing wire and / or ribbon.

[0067] The wires and / or ribbons 1 enter the bath 3 through the bath inlet 4 and exit the bath 3 through the bath outlet 5. The wires and / or ribbons 1 move in a direction of movement 2 in the bath 3, going from the bath inlet 4 to the bath outlet 5, by means of movement drive means (not shown in the figures).

[0068] The pickling device according to the present invention further comprises a series of means 6 for projecting pickling liquid into the pickling bath 3. Said series 6 has a first projection means 11, N intermediate projection means 12, where N is between 1 and 20, and a final projection means 13.

[0069] Each projection means 6 includes a pickling liquor inlet 7, a distribution conduit 8, 2 outlet conduits 9 and at least one outlet 10 per outlet conduit 9.

[0070] The pickling fluid inlet 7 is in fluidic communication with a pickling fluid source (not shown in the figures) at one end and with the distribution conduit 8 at the other end. The pickling fluid source is located below the pickling bath 3, and the first end of the pickling fluid inlet 7 is located at the bottom of the bath 3.

[0071] The pickling liquor source may be equipped with heating means (not shown in the figures).

[0072] The distribution conduit s is in fluidic communication with the pickling liquor inlet 7 and with 2 outlet conduits 9. The fluidic communication between the pickling liquor inlet 7 and the distribution conduit 8 is located between the 2 outlet conduits 9 in fluidic communication with the distribution conduit 8.

[0073] The outlet conduits 9 each include at least one outlet 10 on the pickling bath 3, from which at least one jet 14 of pickling liquor is projected into the bath 3.

[0074] The outlet 10 is the end of the outlet conduit 9 opposite the end in fluidic communication with the distributor conduit 8. The outlet 10 can take several forms such as (i) an opening defined by the external walls of the outlet conduit, (ii) a flattened outlet fitting in the form of a slot, preferably a horizontal slot, (iii) an outlet fitting comprising a wall at one end in contact with the pickling liquid contained in the pickling bath which has an outlet orifice, the outlet orifice being a slot, a circular orifice, a square orifice, a hexagonal orifice, or any other equivalent shape, or (iv) a Y-shaped outlet fitting.

[0075] The entire pickling liquor inlet assembly 7 - distributor conduit 8 - outlet conduits 9 - outlet 10 is substantially horizontal and immersed in the pickling liquor.

[0076] The distribution conduit 8 and the 2 outlet conduits 9 each have a longitudinal direction, respectively A and B. The outlet conduits 9 are arranged with respect to the distribution conduit 8 so as to form a salient angle a in the horizontal plane going from the longitudinal direction A of the distribution conduit 8 to the longitudinal direction B of an outlet conduit 9. This salient angle a is equal to 90°.

[0077] Figure 5 shows a diagram of the device for stripping at least one continuously moving steel wire and / or ribbon according to the present invention. The series of projection means 6 is located in the stripping bath 3. The first projection means 11 is located at the inlet of the bath 4 in the stripping zone C, the 6 intermediate projection means 12 are located in the stripping zone C, and the last projection means 13 is located at the outlet of the bath 5 in the stripping zone C.

[0078] The first projection means 11 has two outlet conduits 9 extending from the two ends of the distribution conduit 8 in the direction of travel. The outlets 10 of the first projection means 11 are arranged to project two jets 14 of pickling solution in the direction of travel. The salient angle α from the longitudinal direction A of the distribution conduit 8 to the longitudinal direction B of an outlet conduit 9 of the first projection means 11 is equal to 90°. The last projection means 13 has two outlet conduits 9 extending from the two ends of the distribution conduit 8 in a direction opposite to the direction of travel. The outlets 10 of the last projection means 13 are arranged to project two jets 14 of pickling solution in the direction opposite to the direction of travel.The salient angle a going from the longitudinal direction A of the distributing conduit s to the longitudinal direction B of an outlet conduit 9 of the first projection means 1 1 is equal to 90°.

[0079] The six intermediate spraying means 12 each have two outlet conduits 9, each equipped with an outlet 10, extending from the two ends of each distribution conduit 8: a first outlet conduit and a second outlet conduit. A first jet of pickling fluid is sprayed in a primary spray direction from the outlet of the first outlet conduit. A second jet of pickling fluid is sprayed in a secondary spray direction from the outlet of the second outlet conduit. The primary spray direction is oriented counter-currently, antiparallel to the secondary spray direction, opposite to each other.

[0080] The primary projection direction may also be opposite to the secondary projection direction without being antiparallel. The primary and secondary projection directions may be deviated from each other by an angle other than 180°. In this case, the primary projection direction is oriented to one side of the longitudinal direction A of the distribution conduit, and the secondary projection direction to the other side in a horizontal plane, such that they are not both directed to the same side of the longitudinal direction A of the distribution conduit of an intermediate projection means.

[0081] A first intermediate projection means and a second intermediate projection means adjacent to the first each have a first and a second outlet conduit. The arrangement of the first intermediate projection means relative to the second intermediate projection means is such that the first outlet conduit of the second intermediate projection means is the outlet conduit closest to the first outlet conduit of the first intermediate projection means. Furthermore, the primary projection direction of the first intermediate projection means is counter-current, or deviated, from the primary projection direction of the second intermediate projection means. The secondary projection direction of the first intermediate projection means is also counter-current, or deviated, from the secondary projection direction of the second intermediate projection means.

[0082] Figure 5 shows intermediate projection means 12 where, for each, the distributor conduit is not perpendicular to the direction of travel 2 and the salient angle α from the longitudinal direction A of the distributor conduit 8 to the longitudinal direction B of the outlet conduit 9 is equal to 90°. It is also conceivable that the distributor conduit 8 of each intermediate projection means 12 is perpendicular to the direction of travel 2, in which case the salient angle α will preferably be different from 90°.

[0083] The pickling device according to the present invention also includes an inlet water curtain 15 formed by a water supply in fluidic communication with a rinsing distributor equipped with outlet ports and located upstream of the pickling bath 3 (not shown in the figures). The inlet water curtain 15 is arranged so that the threads and / or ribbons pass through it. Water collection means are located outside the bath 3 to recover the water from the inlet water curtain 15.

[0084] Similarly, the pickling device according to the present invention comprises an outlet water curtain 16 formed by a water supply in fluidic communication with a rinsing distributor equipped with outlet ports and located downstream of the pickling bath 3 (not shown in the figures). The outlet water curtain 16 is arranged so that the threads and / or ribbons pass through it. Water collection means are located outside the bath 3 to recover the water from the outlet water curtain 16.

[0085] The water supplies for the inlet water curtain 15 and the outlet water curtain 16 can be separate or common.

[0086] The means for collecting the inlet water curtain 15 and the outlet water curtain 16 may be separate or common, and may be located upstream, downstream or below the pickling bath 3.

[0087] In Figures 1 and 2, the inlet conduits 7, the distribution conduits 8, and the outlet conduits 9 of the projection means 6 are interconnected tubes. Each outlet conduit 9 includes an outlet 10 in the form of a flattened outlet fitting in the form of a horizontal slot. In this embodiment, a jet 14 of pickling solution is issued from an outlet 10.

[0088] In Figures 3 and 4, each outlet 9 includes an outlet 10 in the form of a Y-shaped outlet fitting. In this embodiment, two jets 14 of pickling solution are issued from one outlet 10. Figure 7 illustrates these two jets 14 per outlet 10.

[0089] Figures 6 to 11 schematically illustrate different embodiments of intermediate projection means.

[0090] Thus, in operation, to strip wires and / or ribbons 1 in continuous motion, the wires and / or ribbons 1 are driven by the drive means through the stripping device according to the present invention. The wires and / or ribbons 1 first pass through the inlet water curtain 15 upstream of the stripping bath 3, then enter the bath at the bath inlet 4, pass through the stripping zone C, exit the bath at the bath outlet 5 and pass through the outlet water curtain 16 downstream of the bath 3.

[0091] The pickling bath 3 is filled with pickling liquid. The pickling liquid is subject to turbulent flow imparted by the pickling liquid jets 14. The pickling liquid jets 14 are projected from the various projection means 6, distributed throughout the bath 3, in different projection directions. The orientations of the counter-current jet directions and / or the rebounds of the pickling liquid jets 14 off the walls of the bath 3 allow different jets

[0092] 14 to meet and interact with each other, thus creating areas of increased turbulence in the pickling bath.

[0093] Figure 12 illustrates an embodiment comprising two pickling baths 3a, 3b in series, each bath having its own means for projecting pickling solution 6a, 6b: a first projection means 11a, 11b, six intermediate projection means 12a, 12b and a final projection means 13a, 13b. The threads and / or ribbons 1 in motion first pass through the inlet water curtain.

[0094] 15 upstream of bath 3a, then enter bath 3a at the level of bath 4a inlet, pass through a first stripping zone Ca, exit bath 3a at the level of bath 5a outlet, enter bath 3b at the level of bath 4b inlet, pass through a second stripping zone Cb, exit bath 3b at the level of bath 5b outlet and pass through the outlet water curtain 16 downstream of bath 3b.

[0095] It is understood that the present invention is in no way limited to the embodiments described above and that many modifications can be made to it without departing from the scope of the attached claims.

Claims

DEMANDS 1. A device for stripping at least one continuously moving steel wire and / or ribbon (1), comprising Means of driving at least one wire and / or ribbon (1) in a direction of movement (2), At least one pickling bath (3) filled with pickling liquor comprising a bath inlet (4) of said at least one wire and / or ribbon (1) into said bath (3) and a bath outlet (5) of said at least one wire and / or ribbon (1) from said bath (3), between which is a pickling zone, characterized in that it further comprises A series of means for projecting (6) pickling liquid into said bath (3) comprising a pickling liquid inlet (7) in fluidic communication with a pickling liquid source and in fluidic communication with a substantially horizontal distribution conduit (8) immersed in the pickling liquid, said distribution conduit (8) having a longitudinal direction and being in fluidic communication with at least 2 outlet conduits (9), each outlet conduit (9) also having a longitudinal direction and being arranged so as to form a salient angle α in the horizontal plane going from the longitudinal direction of said distribution conduit (8) to the longitudinal direction of said outlet conduit (9), said salient angle α being between 45° and 135°, more particularly between 60° and 120°, even more particularly between 80° and 100°, each outlet conduit (9) comprising at least one outlet (10) onto said pickling bath (3),immersed in the pickling liquid and arranged to project at least one jet (14) of pickling liquid in a projection direction, said series of projection means (6) of pickling liquid comprising a first projection means (11), N intermediate projection means (12) and a final projection means (13), said jet (14) of pickling liquid having at least one outlet (10) of said first projection means (11) having a first projection direction, said jet (14) of pickling liquid having at least one outlet (10) of an n, ième intermediate projection means (12) having an n ième projection direction, said jet (14) of pickling liquid from at least one outlet (10) of said last projection means (13) having a last projection direction, said first, n ième and the final projection directions are each different from each other.

2. A device for stripping at least one continuously moving steel wire and / or ribbon (1) according to claim 1, wherein said first projection means (11) is positioned in said stripping bath (3) at said bath inlet (4), said at least 2 outlet conduits (9) of said first projection means (11) extend from said distributor conduit (8) in said direction of movement (2), said at least one outlet (10) of said at least 2 outlet conduits (9) being arranged to project at least one jet (14) of stripping liquid in said direction of movement (2).

3. A stripping device for at least one continuously moving steel wire and / or ribbon (1) according to claim 2, wherein said salient angle a going from the longitudinal direction of said distributor conduit (8) to the longitudinal direction of said outlet conduit (9) of said first projection means (11) is between 60° and 120°, more particularly between 80° and 100°, even more particularly between 85° and 95°.

4. A device for stripping at least one continuously moving steel wire and / or ribbon (1) according to any one of claims 1 to 3, wherein said last projection means (13) is positioned in said stripping bath (3) at said bath outlet (5), said at least 2 outlet conduits (9) of said last projection means (13) extend from said distributor conduit (8) in a direction opposite to said direction of movement (2), said at least one outlet (10) of said at least 2 outlet conduits (9) being arranged to project at least one jet (14) of stripping liquid in a direction opposite to said direction of movement (2).

5. A stripping device for at least one continuously moving steel wire and / or ribbon (1) according to claim 4, wherein said salient angle a going from the longitudinal direction of said distributor conduit (8) to the longitudinal direction of said outlet conduit (9) of said last projection means (13) is between 60° and 120°, more particularly between 80° and 100°, even more particularly between 85° and 95°.

6. Device for stripping at least one continuously moving steel wire and / or ribbon (1) according to any one of claims 1 to 5, wherein said N intermediate projection means (12) are positioned in said stripping zone.

7. A device for stripping at least one continuously moving steel wire and / or ribbon (1) according to any one of claims 1 to 6, wherein said at least 2 outlet conduits (9) of each intermediate projection means of said N intermediate projection means (12) extend from said distributor conduit (8) and 18 comprise a first outlet conduit (9) and a second outlet conduit (9), each provided with said outlet (10), the outlet of said first outlet conduit being arranged to project a first jet of pickling liquid in a primary projection direction, the outlet of said second outlet conduit being arranged to project a second jet of pickling liquid in a secondary projection direction, said primary projection direction and said secondary projection direction being countercurrent to each other.

8. Device for stripping at least one wire and / or ribbon (1) of steel in continuous motion according to any one of claims 1 to 7, in which N is between 1 and 20.

9. A device for stripping at least one continuously moving steel wire and / or ribbon (1) according to any one of claims 1 to 8, wherein N is between 2 and 19, preferably between 3 and 18, and wherein a first intermediate projection means and a second intermediate projection means adjacent to said first intermediate projection means are provided and each comprise a first and a second outlet conduit (9), said first and said second intermediate projection means being positioned such that said first outlet conduit (9) of said second intermediate projection means is the outlet conduit closest to said first outlet conduit (9) of the first intermediate projection means and such that said primary projection direction of said first intermediate projection means is counter-current to said primary projection direction of said second intermediate projection means.

10. Device for stripping at least one wire and / or ribbon (1) of steel in continuous motion according to claim 9, in which said first intermediate projection means and said second intermediate projection means are positioned such that said secondary projection direction of said first intermediate projection means is counter-current to said second secondary projection direction of said second intermediate projection means. 1 1. A device for stripping at least one wire and / or ribbon (1 ) of steel in continuous motion according to any one of claims 1 to 10, in which said fluidic communication between said inlet of stripping liquor (7) and said distributor conduit (8) is located between said at least 2 outlet conduits (9) in fluidic communication with said distributor conduit (8).

12. A device for stripping at least one continuously moving steel wire and / or ribbon (1) according to any one of claims 1 to 11, wherein said outlets 19 (10) are flattened outlet fittings whose end in contact with the pickling liquid contained in said pickling bath (3) is in the form of a slot, preferably a horizontal slot.

13. A device for stripping at least one continuously moving steel wire and / or ribbon (1) according to any one of claims 1 to 12, further comprising a water supply, a rinsing distributor in fluidic communication with said water supply and equipped with outlet ports, disposed upstream of the stripping bath (3) and arranged to form an inlet water curtain (15), and means for collecting water from said curtain disposed outside said bath (3).

14. A device for stripping at least one continuously moving steel wire and / or ribbon (1) according to any one of claims 1 to 13, further comprising a water supply, a rinsing distributor in fluidic communication with said water supply and equipped with outlet ports, disposed downstream of the stripping bath (3) and arranged to form an outlet water curtain (16), and means for collecting water from said curtain disposed outside said bath (3).

15. Device for pickling at least one wire and / or ribbon (1) of steel in continuous motion according to any one of claims 1 to 14, in which said pickling liquor source is provided with heating means.

16. Method for pickling at least one wire and / or ribbon (1) of steel in continuous scrolling, implementing the device according to any one of claims 1 to 15.

17. A method for pickling at least one steel wire and / or ribbon (1) in continuous motion, wherein at least one wire and / or ribbon (1) is driven by drive means through a pickling bath (3) filled with pickling fluid, to which turbulent flow is imparted by jets (14) of pickling fluid from a series of pickling fluid projection means (6) comprising a first projection means (11), N intermediate projection means (12) and a final projection means (13), N being between 1 and 20, preferably between 2 and 1, even more preferably between 3 and 18,each pickling liquid projection means of said series of pickling liquid projection means (6) comprising a pickling liquid inlet (7) in fluidic communication with a pickling liquid source and in fluidic communication with a substantially horizontal distribution conduit (8) immersed in the pickling liquid, said distribution conduit (8) having a longitudinal direction and being in fluidic communication with at least 2 conduits, 20 outlet (9), each outlet conduit (9) also having a longitudinal direction and being arranged so as to form a salient angle a in the horizontal plane going from the longitudinal direction of said distributing conduit (8) to the longitudinal direction of said outlet conduit (9), said salient angle a being between 45° and 135°, more particularly between 60° and 120°, even more particularly between 80° and 100°, each outlet conduit (9) comprising at least one outlet (10) on said pickling bath (3), immersed in the pickling liquor.

18. Method for pickling at least one steel wire and / or ribbon (1) in continuous flow according to claim 17, wherein said at least one wire and / or ribbon (1) passes through an inlet water curtain (15) upstream of said pickling bath (3).

19. Method for pickling at least one steel wire and / or ribbon (1) in continuous flow according to any one of claims 17 or 18, wherein said at least one wire and / or ribbon (1) passes through an outlet water curtain (16) downstream of said pickling bath (3).

20. A method for pickling at least one continuously moving steel wire and / or ribbon (1) according to any one of claims 17 to 19, wherein each moving wire and / or ribbon (1) has a moving characteristic, said moving characteristic being defined by a quantity Dv between 100 and 400 mm.m / min for moving wires, said moving characteristic being defined by a moving speed v between 5 and 30 m / min for moving ribbons, said moving characteristic being different or identical for each moving wire and / or ribbon (1).

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