WO2010028754A2 - Descaling device - Google Patents

Abstract

The invention relates to a descaling device which can be operated in an optimal manner with respect to the efficiency, descaling quality, energy and water consumption and is readily available. The aim of the invention is achieved such that the spray nozzles (12), which are instrumental in descaling the steel material (2) in the descaling device (8), are designed as static nozzles and as dynamic or rotating nozzles. The static nozzles form, together with the spray bars, pairs of spray bars (13) and the dynamic or rotating nozzles form, together with spray units, rows of pairs of spray units (23).

Description

 descaling

The invention relates to a descaling device for a hot steel material which can be formed along a production line into long and flat products according to the features of the preamble of claims 1, 16 and 17.

From DE 43 02 331 AI a scale scrubber is known, the task of which is to de-scale especially steel belts and thin slabs with reduced water and energy consumption over the entire belt or slab width pore-deep. The object is achieved in that injection units are used with a rotating nozzle head having a plurality of spray nozzles and preferably the two arranged in the edge region of the rolling upper injection units relative to the two arranged in the edge region of the rolling, lower injection units are offset.

DE 43 28 303 C2 discloses a device for descaling hot rolled material by applying it by means of a fluid under high pressure, in particular water. The water emerges from at least one row of nozzles covering the width of the rolling stock with a plurality of nozzle heads, wherein each nozzle head is motor-driven in rotation about an axis of rotation substantially perpendicular to the surface of the rolling stock and has at least two nozzles arranged eccentrically with respect to the axis of rotation. The nozzles of each nozzle head are arranged with different angles to the axis of rotation such that the spray pattern of each nozzle in operation, based on the axis of rotation, covers a different radial area on the surface of the rolling stock to be descaled.

Furthermore, EP 0 625 383 B1 discloses a production line for strips and / or sheets in which u. a. A temperature-recovery system comprising an induction furnace with at least one operating frequency for heating the surface.

BESTÄTJGUNGSKOPfE and the edges of the slabs are followed by a first descaling device and a tunnel kiln, and a second descaling device is present between the tunnel kiln and the roller chain. The first descaling device is a low-speed descaling device with rotating nozzles, while the second desizing device is a high-speed enzammer device with static nozzles.

Furthermore, EP 1 718 424 B1 discloses an apparatus for descaling warm rolling stock by means of water, according to which at least one die head row sweeping over the rolling stock width is provided and wherein each die head is rotating and has a plurality of nozzles which are arranged close to the circumference of the die head, to achieve tangential or overlapping spray patterns on the rolling stock and so to replace the scale comparatively better.

Finally, EP 1 077 095 B1 discloses a descaling device for a continuously cast metal strip, which has significant advantages, in particular in the event of an accident, namely, the water collecting channels arranged above the upper side of the metal strip being pivotable and opposite to the strip running direction independently of their associated water-jet nozzles the metal band height adjustable and selbsttädig are evasive and that the nozzle rows receiving spray bars of the top of the band with a lever arm are freely pivotable and thus arranged vertically adjustable within limits and automatically evasive.

The previously known descaling devices have for descaling the rolling stock either exclusively static nozzles or exclusively rotating nozzles. So it is understandable that with the previously known solutions only a limited number of manipulated variables can be influenced and thus not targeted to the product properties of the different long and Flat steel products and can not respond to process parameters and other targets.

The invention has for its object to provide a descaling, which is optimally operable in terms of their performance, the Entzunderungsqualität, the energy and water consumption and has a high availability.

The object is achieved according to the invention by a descaling device having the features of patent claim 1, patent claim 16 and patent claim 17.

According to the characterizing features of patent claim 1, the spray nozzles of the descaling device are designed as static nozzles and as dynamic or rotating nozzles, and at least one predeterminable number of spray nozzles can be combined with one another in view of their controlled or controlled application.

In a further embodiment of the invention, a certain number of static spray nozzles forms a spray bar pair together with a spray bar arranged above and below the transport plane of the steel material to be descaled, which extends transversely to the transport plane. In this case, several such spray bar pairs may be present in the descaling device.

Furthermore, in the descaling apparatus, a certain number of dynamic or rotary spray nozzles arranged in a plurality of injection units arranged above and in the transport plane form at least one respective injection unit row extending transversely to the transport plane, and two each substantially opposing injection units rows to form an injection unit series pair. Both the at least one spray bar pair and the at least one injection unit row pair can according to the invention form in their longitudinal extension one or more spray zones which can be charged with water as required. The individual spray zones are individually over suitable means, for example via control valves, switched on and off, and at least one pressure source switchable or switched off from the pressure source.

In a further embodiment of the invention, various arrangement variants of individual spray bar pairs or individual injection unit row pairs can be provided.

A first arrangement variant provides that several spray bar pairs are arranged one after the other in the transport direction of the steel material and a device for squeezing or retaining the spray water impinging on the surface of the steel material is arranged between each of a first spray bar pair and a second spray bar pair ,

A second arrangement variant provides that at least one injection unit row pair is arranged after a first and a second spray bar pair in the transport direction of the steel material. A third arrangement variant provides that at least one injection unit row pair is arranged between the first spray bar pair and the second spray bar pair.

A fourth arrangement variant provides that in the transport direction of the steel material several injection units-row pairs are arranged one after another and the injection units-row pairs at least one spray bar pair is assigned.

A fifth arrangement variant provides that at least one injection unit row pair and subsequently at least one spray bar pair is arranged in the transport direction of the steel material. In a further embodiment of the invention, two spray bars arranged offset from one another in each case form a spray bar module, which is received displaceably or exchangeably in the housing of the descaling device transversely to the transport direction of the steel material. Furthermore, the respective injection unit rows are arranged on a rail located transversely to the transport plane within the housing and are received in a modular manner by the running rail. Furthermore, as already mentioned above, a device for squeezing off or retaining the spray water is arranged between in each case two spray bar pairs and / or between in each case two injection unit row pairs. According to the features of the preamble of claim 16, the object underlying the invention is achieved in that the spray nozzles are static see nozzle, which together with spray bar at least a first and second spray bar module and that between two modules, a further device is arranged the squeezing or retention of the incident on the surface of the steel material spray water is used.

According to the features of the preamble of claim 17, the object underlying the invention is further achieved in that the spray nozzles are first static nozzles, which together with spray bars form at least one spray bar module, and the spray nozzles are second dynamic or rotating nozzles in a nozzle head an injection unit are formed, wherein a plurality of such injection units are arranged in a row above and below and transverse to the transport plane of the steel material and form an injection unit row module, and that between the spray bar module and the injection units row module, a further means is arranged, the squeezing or retaining the splashing water impinging on the surface of the steel to be descaled.

With regard to the arrangement of the descaling device within the production line, this may be positioned downstream of a continuous casting machine and / or in a single-stage or multi-stand hot rolling line designed as a production line, specifically before at least one hot rolling stand. Further features of the invention will become apparent from the following description in which reference to an embodiment of the invention will be explained in more detail.

In the drawings show: 1 shows the production line of the long and flat product formable, warm steel material with the arrangement of the Enzunderungsvorrichtung invention after the continuous casting machine and in front of a double roll stand of a hot rolling mill,

2 shows the Entzunderungsvorrichtung in cross section with a first and a second per se known spray bar pair and

3 the descaling device in cross-section with a spray bar pair and an injection unit row pair.

1 shows a detail of a production line 1, which converts a hot steel material 2 to a long and flat product. The production line 1 comprises a continuous casting machine 3, strand guiding means 4, between which the steel material 2 is guided and transported in a horizontal plane for further processing. A first step of the further processing may be, for example, that the steel material 2 passes through a scissor assembly 5 synchronized with the casting speed, in which the steel material is cut into sections of predetermined length. The scissor assembly 5 may, as is well known, be preceded by a straightening driver, not shown here, which is also synchronized with the casting speed. Subsequently, for example, each section of the steel material 2 passes through a first descaling device 6 or 8 designed according to the invention. After the first descaling device 6 or 8, a furnace 7 can be provided which, due to the steel material 2 cooled by spray water in the near-surface region, the steel material to the required Raises temperature for further processing. After the steel material 2 has passed through the furnace 7, a second descaling device 6 or 8 designed according to the invention can be arranged in front of a rolling stand or a single- or multi-stand hot rolling line 9. FIG. 2 illustrates, with regard to the use of spray bars for descaling the steel material 2, an alternative embodiment of a known descaling device 6, namely, spraying nozzles 12, which are designed as static nozzles, together with at least one over and under - At least one arranged below the transport plane 10 of the steel material 2 spray bars 13.1 and 13.2 to form a spray bar pair 13. This descaling device 6 comprises a housing 14, in which in the rolling direction 15, the horizontally extending transport plane 10 for the Stahlmateria! 2 is formed. The transport plane 10 is formed by the roller conveyor rollers 16 arranged within the housing 14 and over its longitudinal extension and the rollers 17. 1 of a plurality of devices 17 arranged in the housing 14, which are arranged parallel to the roller conveyor rollers 16. The respective roller 17.1 of the device 17, together with another roller 17.2, which is arranged vertically and axially parallel to the roller 17.1, the squeezing or retention of the impinging on the surface of the steel material 2 spray water.

As is also known from DE 43 02 331 A1 and from EP 1 077 095 B1, a first device 17 is arranged on the input side and a second device 17 on the output side of the descaling device 6. Such devices 17 are therefore known, so that no closer to the constructive training must be discussed here. The descaling device 6 further comprises a first spray bar pair 13 and a second spray bar pair 20. The first spray bar pair 13 consists of the first spray bar 13.1 arranged below the transport plane 10 and the second spray bar 13.2 arranged above the transport plane 10. The first spray bar 13.1 is preferably arranged stationary, while the second spray bar 13.2 is preferably arranged vertically adjustable. As is known per se, each spray bar 13.1, 13.2 is assigned a spray water collecting channel 18 or 19 above the transport plane 10. While the spray bar 13.1 associated splash water gutter 18 preferred way is fixed, the spray bar 13.2 associated splash water gutter 19 is either fixed or height-adjustable. The spray bars 13.1, 13.2 form in their longitudinal extent across the transport plane 10 a plurality, not shown here, spray zones, which can be switched on and off via suitable control means. This individual and targeted admission of the steel material 2 is achieved with spray water and simultaneously worked on a saving of spray water and electrical energy to operate the trained example as a pump spray water pressure source.

The second spray bar pair 20, which is arranged in the descaler 6, is identical to the spray bar pair 13 in terms of its design and its arrangement within the housing 14. The assignment of the spray water collecting channels 18, 19 is identical, so that this can be dispensed with further explanations. Advantageously, in the rolling direction 15 between the spray bar pair 13 and the spray bar pair 20, a means 17 for squeezing or retaining the spray water is arranged, which is identical in construction to the input side and output side of the descaling device 6 arranged means 17 and in principle those corresponds, as disclosed in EP 1 077 095.

The respective spray bar pair 13, 20 arranged in the descaling device 6 is furthermore designed as a spray bar module and arranged displaceably and interchangeably in the housing 14 on suitable means transversely to the transport direction 11 of the steel material 2. Finally, the housing 14 of the descaler 6 is covered from above by a hood 21. The purpose of such a hood 21 is sufficiently described in EP 1 077 095 B1, so that further explanations can be dispensed with.

In Fig.3 a descaling device 8 is shown, which differs from the devices known from the prior art and of the described Device according to Fig.2 different. The difference is that for descaling the steel material 2 both spray nozzles 12 are used, which are designed as static nozzles, and with at least one below and at least one arranged above the transport plane 10 spray bars 13.1, 13.2 form a spray bar pair 13 or spray bar module , as well as spray nozzles 12 are used, which are designed as dynamic or rotating spray nozzles, and which are formed in a plurality of injection units 22 arranged above and in several below the transport plane 10. In this case, the injection units 22 are formed in each case at least one injection unit row 22.1, 22.2, which are arranged offset in the opposite direction and transversely over and under the transport plane 10 of the steel material 2. Two such injection unit rows 22.1 22.2 thus form an injection unit row pair 23. Each injection bar of the spray bar pair 13 and each injection unit row of the injection unit row pair 23 can be divided over its longitudinal extent in several spray zones to splash on demand and targeted to the surface of the steel to be descaled steel 2. For this purpose, not shown here suitable means are present, by means of which both the spray bar pair 13 and the injection unit series pair 23 and the injection zones of the pairs 13, 23 depending on demand to a pressure source not shown here are switched on and off. In order to be able to react to the different conditions and requirements for quality-appropriate descaling, furthermore, different arrangement variants of the at least one spray bar pair 13 and the at least one injection unit row pair 23 are advantageously conceivable within the housing 14. 3 shows one of the variants.

After the spray bar pair 13 with the associated spray water collecting channels 18, 19, an injection unit row pair 23 with the associated spray water collecting box 24, 25 is arranged here in the transport direction 11 or in the rolling direction 15. Between the spray bar pair 13 and the injection unit row pair 23, a device 17 for squeezing or retaining the spray water is provided, as already apparent from Fig.2. The injection units rows 22.1, 22.2 and / or the individual injection units 22 are also designed here in the manner of a module, so that in the event of an accident, the modules can be replaced without significant effort. The injection unit row 22.1 arranged below the transport plane 10 can be accommodated, for example, by a running rail 26 provided within the housing 14, while the injection unit row 22.2 arranged above the transport plane 10 can be movably arranged on the hood 21.

The use of two differently shaped and differently acting spray nozzles 12 for descaling in a descaling 8, so static and rotating spray nozzles, leads advantageously to a surface quality of the steel material 2, which meets the highest requirements and which leads to the reduction of energy and water consumption , Thus, in the case of temperature-critical products, for example in thin-strip rolling or austenitic rolling, descaling can take place exclusively by means of the dynamic or rotating spray nozzles, ie by means of the at least one injection unit row pair 23, while with very high demands on the surface quality of the steel product 2 both the injection unit Row pair 23 and the spray bar pairs 13 can be switched. The use of differently acting spray nozzles 12 also advantageously results in simultaneous operation of the injection unit row pair 23 and the spray bar pair 13, the break with the first spray bar pair 13 seen in the transport direction 10 and the cleaning of the surface of the steel material 2 can be done from the broken scale with the second injection units series pair 23.

Claims

claims A descaling apparatus for a hot steel material (2) transformable into a long and flat product line (1), comprising: a transporting plane (10) for the steel material (2); and a plurality of vertically and / or under the transport plane (10) arranged and on the surface of the steel material (2) directed means in the form of spray nozzles (12) from which water under high pressure for descaling the surface of the steel material (2) controlled and / / or regulated outlet, characterized in that the spray nozzles (12) are designed as static nozzles and as dynamic or rotating spray nozzles and the spray nozzles (12), in view of the controlled and / or controlled application of spray water, are combined. 2. descaling device according to claim 1, characterized in that the static spray nozzles together with at least one and above the transport plane (10) arranged spray bars (13.1, 13.2), which are arranged transversely to the transport plane (10) of the steel material (2) , a spray bar pair (13) form, and that the dynamic or rotating spray nozzles in at least one and above the transport plane (10) arranged injection unit (22) are formed and wherein the above and below the transport plane (10) arranged respective injection units (22) mounted to at least one respective injection unit row (23.1, 23.2) and extend transversely above and below the transport plane (10) of the steel material (2), and the two units of syringe assembly being offset from one another and forming an injection unit row pair (23). 3. descaling device according to claim 2, characterized in that both the at least one spray bar pair (13) and the at least one injection unit row pair (23) in its longitudinal extension forms a plurality of spray zones. 4. descaling device according to claim 3, characterized in that the spray zones are individually switched on and off by suitable means. 5. descaling device according to claim 2, characterized in that in the transport direction (11) of the steel material (2) a plurality of spray bar pairs (13) are arranged one after the other. 6. descaling device according to one or more of the preceding claims 1 to 4, characterized in that in the transport direction (11) of the steel material (2) after a first and a second spray bar pair (13) at least one injection unit row pair (23) is arranged. 7. descaling device according to one or more of the preceding claims 1 to 4, characterized in that between the first spray bar pair (13) and the second spray bar pair (13) at least one injection unit row pair (23) is arranged. 8. descaling device according to one or more of the preceding claims 1 to 4, characterized in that in the transport direction (11) of the steel material (2) a plurality of injection units series pairs (23) are arranged successively and the injection units row pairs at least one spray bar pair (13) is assigned. 9. descaling device according to one or more of the preceding claims 1 to 4, characterized in that in the transport direction (11) of the steel material (2) at least one injection unit row pair (23) and subsequently at least one spray bar pair (13) is arranged , 10. descaling device according to claim 2, characterized in that in each case two mutually offset, opposite, arranged spray bars (13.1, 13.2) form a spray bar module. 11. descaling device according to claim 10, characterized in that each spray bar module transversely to the transport direction (11) of the steel material (2) slidably received in the housing (14) of the Entzunderungsvor- direction. 12. descaling device according to claim 10, characterized in that the spray bar modules are added interchangeable. 13. descaling device according to claim 12, characterized in that the respective injection unit rows (23) on a within the housing (14) existing running rail (26) are arranged and received in a modular manner by the running rail. 14. descaling apparatus according to claim 10, characterized in that each spray bar module between a first means (17) and second means (17) for squeezing or retaining the spray water is arranged. A descaling device according to claim 13, characterized in that each injection unit row pair (23) is arranged between a first device (17) and a second device (17) for squeezing or retaining the spray water. A descaling apparatus for a hot-rolled steel material (2) transformable into a long and flat product line (1), comprising: a housing (14), a transport plane (10) for the steel material (2) inside the descaling device (6); a plurality of vertically above and below the transport plane (10) arranged and on the surface of the steel material (2) directed means in the form of spray nozzles (12) from which water under high pressure for descaling the surface of the steel material (2) controlled or exits; and a device (17) provided on the input side and output side of the housing (14) for squeezing or holding the spray water impinging on the surface of the steel material (2), characterized in that the spray nozzles (12) are static nozzles which, together with spray bars (13.1, 13.2; 20.1, 20.2), form at least one first and second spray bar module (13, 20) and in that a further device (17) is arranged between the two modules which serves to squeeze or retain the spray water impinging on the surface of the steel material (2). 17. A descaling device for a hot steel material (2) transformable into a long and flat product line (1), comprising: a housing (14), a transport plane (10) for the steel material (2) within the descaling device (6), a plurality of vertically above and below the transport plane (10) arranged and on the surface of the steel material (2) directed means in the form of spray nozzles (12) from which water under high pressure for descaling the surface of the steel material (2) controlled or exits, and a device (17) provided on the input side and output side of the housing (14) for squeezing or holding the spray water impinging on the surface of the steel material (2), characterized in that the spray nozzles (12) are first static nozzles which together with spray bars ( 13.1, 13.2) form at least one spray bar module (13), and the spray nozzles (12) second dynamic or rotating nozzles s Ind, which are formed in a nozzle head of an injection unit (22), wherein a plurality of such injection units in the manner of an injection units row (23) above and below and transverse to the transport plane (10) of the steel material (2) are arranged and form an injection unit row module and that between the spray bar module and the injection unit rows Module another device (17) is arranged, the squeezing or retention of the spray water impinging on the surface of the steel material (2). 18. descaling device according to one of the preceding claims, characterized by their arrangement in a production line (1) formed mono- or multi-stand hot rolling mill, in the following of a continuous casting machine (3) and at least one hot rolling stand (9). LIST OF REFERENCE NUMBERS 1 production line 2 steel material 3 continuous casting machine 4 strand guiding means 5 scissors arrangement 6 descaling device 7 oven 8 descaling device 9 rolling stand 10 transport level 11 transport direction 12 spray nozzle 13 spray bar pair 13.1 Spray bar 13.2 Spray bar 14 housing 15 rolling direction 16 roll 17 establishment 17.1 roll 17.2 roll 18 splash water gutter 19 splash water gutter 20 spray bar pair 21 hood 22 injection unit 22.1 injection units series 22.2 injection units series 23 injection units-series pair Splash catcher Splash catcher Rail