EP1151149B1 - Method and device for scouring and cleaning rolled steel strip - Google Patents

Abstract

A device for pickling or cleaning rolled steel strip which is moved in the form of loops through several pickling and cleaning containers arranged within a treatment line, wherein at least one strip side is subjected tot he action of a pickling or cleaning medium. For this purpose, squirting or spraying units are provided which can be switched on or off and/or are adjustable with regard to their spraying width and/or are operated with controllable squirting or spraying pressure and/or volume flow. Deflection rolls for deflecting the strip are arranged before and after the treatment line for deflecting the strip out of the horizontal strip running plane into an upright vertical strip running plane and vice versa, wherein the deflection rolls are elevated or slanted relative to the horizontal strip running plane.

Description

The invention relates to a method and a device for pickling and cleaning of rolled steel strip that is looped through several in the treatment line arranged pickling or cleaning container moves through and from the pickling or cleaning medium is applied to at least one hinge side, for which spray or spray units are provided which can be switched on or off and / or are adjustable in their spray width and / or with adjustable spray or spray pressure and / or volume flow and / or changeable temperature.

The need for and the criteria for pickling rolled hot strips is described in EP 0 602 437 A1 for pickling plants of various types such as Deep containers, flat containers, turbo stains etc. are sufficiently disclosed. These plants are in their pickling line on the highest belt speed and / or on the the most difficult steel strip to be pickled, but this is only accurate which applies to a pickling task. For different pickling tasks, e.g. in the So-called turbo pickle (see. DE 40 31 234 A), tried by changing the Temperature of the pickling acid an adjustment between the existing pickling line, To reach the belt speed and the difficulty of the steel strip to be pickled. Since a change in temperature is only possible slowly, the aim is to a more or less large volume flow and the resulting turbulence to create an immediately effective compensation. As with existing ones, however Success has shown plants of this type in operation, however, is very limited. In addition, these stains require a large system length.

Another construction of a pickle has become known from DE-AS 1 163 634. This pickling line consists of a tower mounted in a steel frame in which the tape is guided in vertical lines and sprayed with pickling acid, which is used in several floors arranged on both sides of the belt nozzles is directed against the tape, depending on the width of the tape on the have adjustable opening slots for each spray width. Here too it is difficult to adapt to other pickling tasks, and are also in usually very high towers (e.g. 100 m high) required. Comparable with this Designs and constructions or arrangements are for cleaning systems known.

The invention has for its object a method and an apparatus to create the type mentioned above, with which the space required for the pickling or Cleaning systems can significantly reduce, and also an exact adjustment to the respective pickling or cleaning task with the aim of a reduced Pickling time or cleaning time and an improved over the range Enable pickling result or cleaning result.

This object is achieved with a method according to the invention in that the Belt before entering the pickling treatment part or cleaning treatment part from the horizontal belt level to an upright, vertical Belt running level and after running out of the pickling treatment part or Cleaning treatment part redirected to its normal, horizontal belt running level becomes. The deflection of the tape into the upright, upright position makes it possible space-saving and space-saving to manage and a variable system structure to achieve, which allows an optimal use of the available space. The Container height is determined by the bandwidth, and that in relation to its Width in a standing or vertical manner over in the pickling tank or Guided cleaning rollers with deflection rollers mounted on vertical roller axes Belt is preferably from two sides with the pickling medium or Sprayed or sprayed cleaning medium. The pickling tanks or cleaning tanks, i.e. the containers of the pickling treatment part or cleaning treatment part which in usually has pickling or cleaning and rinsing containers and a dryer, can, depending on the space, cross to the tape running direction or parallel to Belt running direction and thus in series one behind the other or one above the other, i.e. can be built next to each other in the most varied of arrangements.

At the same time, according to the belt speed and / or the pickling or cleaning steel strip the exact pickling line or Set the cleaning distance by more or less spray or spray bars, i.e. Spray units can be switched on or off, whereby only minimal Amounts of acid or cleaning quantities and therefore the smallest storage containers are necessary are. In contrast to, for example, horizontal belt guides where due to adhesion, the applied pickling or cleaning medium is carried along is, so that the pickling or cleaning line inevitable in their setting changed, the medium flows when the belt is guided in an upright position due to gravity largely downwards, with which the setting is maintained. The also adjustable spray or spray pressure and / or Volume flow of the pickling medium or cleaning medium are unchanged as further, immediately acting actuators for economic adaptation to the Pickling or cleaning task available, so that in connection with the slowly changeable temperature control is an economically optimally controllable one Pickling plant or cleaning plant results. It can also be taken into account that the Production or the speed e.g. a coupled pickling tandem cold rolling mill for thicker strip thicknesses not only due to the existing strip length of the used federal, but very often also by the thermal limit of the Heat exchanger for the acid is limited. Because the heat transfer between Acid and steel strip is in a spray or spray stain in an upright position guided rolled strip much more effectively than in an acid bath Flat container or. Turbo pickling, because hot acid is constantly present in an economical manner the belt surface is sprayed or sprayed. This allows for thicker ones too pickling belts an increase in speed and thus in production.

A preferred embodiment of the invention provides that the bandwidth differently scaled or contaminated band areas with changed Spray pressure and / or changed acid concentration or cleaning concentration and / or increased volume flow of the pickling medium or cleaning medium be sprayed. This purposefully possible influence on experience has shown stronger scaled or contaminated strip areas, such as in particular at the strip edges, also helps to reduce the pickling time and cleaning time and thus the Pickling tank length or cleaning tank length at.

In an advantageous device for performing the method, before and behind the pickling treatment part or cleaning part, the tape from the horizontal belt level into an upright, vertical belt level and reversing turning roller available, raised against the horizontal or is arranged inclined. The redirection at the beginning of the system runs here the belt enters vertically from below or above and runs vertically behind the system down or up, with the turning rollers preferably at 45 ° against the Horizontal are raised or inclined.

According to an advantageous embodiment, the turning rollers have vertical axes associated tensioned roller sets that hold the belt in the middle of the system, whereby the required belt tension over the vertically acting frictional forces between the Rolls and the tape is generated.

It may be expedient here that at least one of the pickling tanks or Cleaning container arranged belt deflection rollers is designed as a control roller and / or the belt deflection rollers are preferably also assigned pressure rollers. The control roller or rollers, of which depending on the pickling tank length or Cleaning container length one or more are designed to serve one possible correction of the tape run. Which especially with thicker strip thicknesses and long pickling tanks or cleaning tanks with an additional drive provided pulleys are the same as belt tension losses caused by bending again and thus support the maintenance of the required Strip tension.

In order to prevent tape tension loss, such as a power failure, that the If the belt slips out of the center of the system, the pressure rollers press the belt with it such a force on the pulleys that over the vertical acting Frictional force the band is worn. Another advantage is that by the interaction of the deflection roller with the pressure roller until then possibly entrained acid squeezed off and thus a cascade of pickling acid or cleaning solution is made possible.

According to an advantageous embodiment of the invention, at least the one in The first pickling tank or cleaning tank lying in the direction of the belt running Equipped with ultrasonic actuators. These increase the removal speed of the Scale layer or contamination layer from the strip surface.

Here it is recommended that the ultrasonic actuators be in one of outlet-side sealing rollers limited, narrow separate chamber are arranged, and there advantageously distributed over the range behind acid-resistant or alkali-resistant partition walls in each case on the front side of the chamber. The separate chamber is formed by means of the sealing rolls on the conveyor belt, i.e. in the respective Pickling tank or cleaning tank divided. This offers the opportunity to Coupling the sound energy to the chamber constantly with acid or cleaning solution to flood and thus the transmission of sound energy to the belt surface favor.

Fig. 1

in schematischer Längsansicht als Einzelheit den Beiz-Behandlungsteil einer gegebenenfalls an ein nachgeschaltetes Walzwerk gekoppelten Bandbehandlungsanlage;

Fig. 2

den Beiz-Behandlungsteil in der Draufsicht;

Fig. 3

eine Variante des Beiz-Behandlungsteils mit in Reihe hintereinander angeordneten Behältern, in der Draufsicht dargestellt; und

Fig. 4

in schematischer Draufsicht eine Abwandlung mit gegenüber Fig. 3 in Zick-Zack-Anordnung hintereinander geschalteten Behältern;

Fig. 5

in der Draufsicht eine andere Ausführung mit parallel zur Bandlaufrichtung und damit über- bzw. nebeneinander angeordneten Behältern;

Fig.6

in der Draufsicht eine Abwandlung der in Fig. 5 gezeigten Behälter-Anordnung;

Fig. 7

einen Schnitt entlang der Linie A-A von Fig. 2;

Fig. 8

einen Schnitt entlang der Linie B-B von Fig. 2; und

Fig. 9

als Einzelheit eine von Dichtrollen begrenzte Kammer mit darin angeordneten Ultraschallaktoren, schematisch dargestellt.

Further features and advantages of the invention result from the patent claims and the following description, in which some exemplary embodiments of the subject matter of the invention are explained in more detail. Show it:

Fig. 1

in a schematic longitudinal view as a detail, the pickling treatment part of a belt treatment plant optionally coupled to a downstream rolling mill;

Fig. 2

the pickling treatment part in plan view;

Fig. 3

a variant of the pickling treatment part with containers arranged in a row one behind the other, shown in plan view; and

Fig. 4

a schematic plan view of a modification with respect to FIG. 3 in a zigzag arrangement, one behind the other containers;

Fig. 5

in plan view another embodiment with parallel to the tape running direction and thus superimposed or juxtaposed containers;

Figure 6

a plan view of a modification of the container arrangement shown in Fig. 5;

Fig. 7

a section along the line AA of Fig. 2;

Fig. 8

a section along the line BB of Fig. 2; and

Fig. 9

as a detail, a chamber delimited by sealing rollers with ultrasound actuators arranged therein, shown schematically.

From a strip treatment plant, not shown in detail, with the strip running direction 1 (cf. the arrow in FIG. 2) is essentially only the one in FIG. 1 Pickling treatment part or cleaning treatment part 2 shown; are recognizable in addition, the last and first roles 3a, 3b and 4a, 4b one before and S-roll stand arranged behind the pickling section or cleaning section 2. The Pickling part or cleaning part 2 comprises three pickling containers or Cleaning containers I, II and III, which are a container IV for rinsing and drying of the metallic strip 5 that is to be passed through, to be pickled or cleaned followed. The individual containers I to IV are on via supply and return lines 6 that store a necessary amount of acid or cleaning solution Storage container 7 connected to which to promote the acid or Cleaning solution for application to the belt surface assigned to pumps 8 are. These supply to both in the pickling tanks and cleaning tanks Sides arranged transversely to the belt run spray or spray bar 9, which in Embodiment (see FIGS. 7 and 8) as tubes with arranged therein Spray nozzles 18 are formed which are directed towards the belt surface and a Generate the desired spray pattern 19. The spray or spray bar 9 and its nozzles 18 can also be switched on or off, depending on the bandwidth Adjust 20 and run so that targeted areas of the metallic tape, the are particularly heavily scaled or contaminated, with either higher spray pressure and / or changed acid volume or cleaning solution volume, changed Acid temperature or cleaning solution temperature and / or with acids or Cleaning solutions of other acid concentrations or cleaning solution concentrations be sprayed or sprayed. To need The spray or spray bar 9 can also operate discontinuously in the system be completely switched off.

The width of the metallic band 5 is in a standing or upright way over in the pickling chambers or cleaning chambers I to IV with vertical axes 21, i.e. Deflection rollers arranged upright in roller bearings 10 meandering out (see. Fig. 2). To set up the metallic band 5 in its upright position is the pickling or cleaning part 2 a horizontal Deflection roller 12 and a 45 ° raised or 45 ° above the horizontal inclined inlet turning roller 11 upstream. From the horizontal deflection roller 12 the band 5 is perpendicular upwards or downwards to the turning roller and from there guided into a tensioning roller set 13, the tensioning rollers 13a, 13b of which are upright, i.e. are stored with vertical axes over which the band 5 then through the individual container I to IV of the pickling part or cleaning part 2 is moved through.

At the end - on the outlet side - of the pickling part or cleaning part 2, there is also a Outlet turning roller 14 inclined or raised at 45 ° to the horizontal arranged on which the pickled or cleaned belt 5 with a two Tensioner rollers 15a, 15b having tensioner roller set mounted on vertical axes 15 coming down or up and the tape 5 runs into the horizontal tape running level so that the treated tape subsequently can be reeled up or immediately run into a downstream rolling mill.

That in terms of its width in a standing manner or in an upright position by the Pickling tank or cleaning tank I to IV meandering belt 5 makes it possible to build the system in various ways and arrangements Pickling tank or cleaning tank I to perform IV to the existing Make optimal use of space.

In the embodiment according to FIGS. 1 and 2 with transverse to the tape running direction 1 arranged pickling or cleaning containers I to IV passes through the belt 5 the lid 16 of the first container I and leaves one area for rinsing and for drying, the last container IV also through the lid 16; the individual containers I to IV are here in parallel one behind the other.

In the variants of the pickling and cleaning treatment parts 102 and 202 as well 302 and 402 according to FIGS. 3 and 4 or 5 and 6, the containers I to IV are parallel to The belt running direction 1 is arranged, the belt 5 passing through both on the inlet and outlet side the respective container side wall 17 enters or exits the treatment part. In the Variant according to FIGS. 3 and 4, the containers I to IV of the pickling or. Cleaning treatment parts 102 and 202 in a row in a row, the 4 shows a zigzag arrangement of the container.

The modifications of the pickling and cleaning treatment parts 302 and 402 5 to 6 are the containers I and II in a compact arrangement one behind the other and the containers III and IV are - seen in the plane of the drawing - arranged above, the band 5 in each case the last container IV from the trained dry area IVa leaves, which is equally for the Arrangements according to FIGS. 1, 2 and 3 applies. Due to the container arrangement Fig. 6 runs - unlike all other versions - the band 5 on the same Page in the pickling or cleaning treatment part 402 and out there. Apart from the different arrangement and location of the containers I to IV or IVa the other components do not differ from those of FIGS. 1 and 2, so that these matching components in all versions with the same Reference numbers are provided.

7 and 8 show details of constructive, advantageous configurations the pickling tank I to IV is shown, namely that according to FIG. 7, in this case with a drive 22 connected via a clutch 23 and a gear 24 Deflection roller 10 assigned a pressure roller 25, the swivel lever 26 in one Frame 27 is mounted. 8 is a deflection roller as Control roller 100 formed and for this purpose in a swivel frame 28th arranged or stored, which in turn by one on the steel structure attached base frame 29 is added, the guides 30 for the Has pivot frame 28. The band 5 here has a compared to FIG. 7 smaller bandwidth 20, and there are accordingly fewer spray nozzles 18 switched on.

To increase the removal rate of scale or contaminants from the According to FIG. 9, the surface of the belt 5 is at least in the direction of belt travel 1 First container I provided several ultrasonic actuators 31. These are in one of inlet and outlet-side sealing rollers 32 limited, narrow separate chamber 33 each arranged behind acid-resistant or alkali-resistant partition walls 34.

Claims (10)

1. A method for pickling and cleaning a rolled steel strip that is transported through several pickling containers or cleaning containers arranged in the treatment line in a loop-shaped fashion, wherein the pickling medium or the cleaning medium acts upon at least one side of the steel strip by means of spraying units that can be switched on or off and/or have an adjustable spraying width and/or are operated with a controllable spraying pressure and/or volume flow, characterized by the fact that the strip (5) is respectively deflected from the horizontal strip transport plane into an upright, vertical strip transport plane before it enters the pickling treatment section or the cleaning treatment section (2, 102, 202, 302, 402), and by the fact that the strip is respectively deflected into its normal horizontal strip transport plane after it emerges from the pickling treatment section or the cleaning treatment section.
2. The method according to Claim 1, characterized by the fact that unclean strip regions over the width (20) of the strip which are scaled to different degrees are sprayed in a targeted fashion with a changed spraying pressure and/or a changed acid concentration or cleaning solution concentration and/or an increased volume flow of the pickling medium or the cleaning medium.
3. A device for pickling and cleaning a rolled steel strip (5) that is transported through several pickling containers or cleaning containers (I, II, III, IV, IVa) arranged in the treatment line in a loop-shaped fashion, wherein the pickling medium or the cleaning medium acts upon at least one side of the steel strip by means of spraying units (9) that can be switched on or off and/or have an adjustable spraying width and/or are operated with a controllable spraying pressure and/or volume flow, in particular for carrying out the method according to Claim 1, characterized by one respective deflecting roller (11; 14) in front and behind the pickling treatment section or the cleaning treatment section (2, 102, 202, 302, 402), wherein the deflecting rollers are raised and inclined referred to the horizontal line and deflect the strip (5) from the horizontal strip transport plane into an upright, vertical strip transport plane and vice versa.
4. The device according to Claim 3, characterized by the fact that sets of tensioning rollers (13; 15) that are supported on horizontal axles are assigned to the deflecting rollers (11; 14).
5. The device according to Claim 3 or 4, characterized by the fact that at least one of the strip reversing rollers (10) arranged in the pickling containers or the cleaning containers (I - IV) is realized in the form of a control roller (100).
6. The device according to one of Claims 3 - 5, characterized by the fact that at least one of the strip reversing rollers (10) arranged in the pickling containers or the cleaning containers (I - IV) is additionally driven.
7. The device according to Claim 5 or 6, characterized by the fact that pressing rollers (25) are assigned to the strip reversing rollers (10).
8. The device according to one of Claims 3 - 7, characterized by the fact that at least the first pickling container or cleaning container (I) viewed in the strip transport direction (1) is equipped with ultrasonic actuators (31).
9. The device according to Claim 8, characterized by the fact that the ultrasonic actuators (31) are arranged in a separate narrow chamber (33) that is limited by sealing rollers (32) on the intake side and the outlet side.
10. The device according to Claim 9, characterized by the fact that the ultrasonic actuators (31) are distributed over the width (20) of the strip and respectively arranged on the end face of the chamber (33), namely behind acid-resistant or lye-resistant intermediate walls (34).

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