EP2783766A1 - Cooling section with lower spray bar - Google Patents

Abstract

A cooling section for a flat rolling stock (1) has a frame construction (2) in which, seen in a transport direction (x) for the flat rolling stock (1), a plurality of transport rollers (3) are arranged one behind the other. Immediately adjacent transport rollers (3) seen in the transport direction (x) have a respective distance (a) from one another. The transport rollers (3) are rotatably mounted in the frame construction (2) about a respective roller axle (4). The roller axes (4) are orthogonal to the transport direction (x) and horizontal, so that the transport rollers (4) form a pass line (5) for the flat rolling stock (1). Below the passline (5) at least one lower spray bar (6) is arranged. The at least one lower spray bar (6) has a base block (7) arranged below the transport rollers (3), into which a liquid coolant (8) is fed. From the base block (7), a number of guide portions (9) project upwardly into spaces between the transport rollers (3). The guide sections (9) have an upper end element (10) on which spray nozzles (11) are arranged, by means of which the coolant (8) fed into the base block (7) is sprayed from below onto the flat rolled stock (1). The guide sections (9), viewed in the transport direction (x) of the flat rolling stock (1), have a respective length (1). The lengths (1) decrease at least in the vicinity of the respective upper end elements (10) in the direction of the respective upper end element (10).

Description

• wobei die Kühlstrecke eine Rahmenkonstruktion aufweist, in der in einer Transportrichtung für das flache Walzgut gesehen hintereinander eine Mehrzahl von Transportrollen angeordnet ist,
• wobei in Transportrichtung gesehen unmittelbar benachbarte Transportrollen einen jeweiligen Abstand voneinander aufweisen,
• wobei die Transportrollen in der Rahmenkonstruktion um eine jeweilige Rollenachse drehbar gelagert sind,
• wobei die Rollenachsen orthogonal zur Transportrichtung und horizontal verlaufen, so dass die Transportrollen eine Passline für das flache Walzgut bilden,
• wobei unterhalb der Passline mindestens ein unterer Spritzbalken angeordnet ist.

The present invention relates to a cooling section for a flat rolling stock,

• wherein the cooling section has a frame construction, in which, seen in a transport direction for the flat rolling stock, a plurality of transport rollers are arranged in succession,
• wherein directly adjacent transport rollers seen in the transport direction have a respective distance from each other,
• wherein the transport rollers are rotatably mounted in the frame structure about a respective roller axis,
• wherein the roller axes are orthogonal to the transport direction and horizontal, so that the transport rollers form a passline for the flat rolling stock,
• wherein below the passline at least one lower spray bar is arranged.

Such a cooling section is well known.

In the prior art, a so-called laminar cooling often takes place. In a laminar cooling, the cooling section has at least one spray bar, which is arranged below the transport rollers. In the spray bar, tubes are usually welded in a series extending parallel to the roller axes and projecting upwards in the direction of the rolling stock. The tubes are seen both in the transport direction seen from the transport rollers and seen in the direction of the roller axes from each other. The removal of the applied from below to the rolling stock coolant is therefore easily possible.

Recently, a so-called intensive cooling is known. The intensive cooling is a novel cooling method for cooling a rolling stock during hot rolling or immediately thereafter. she serves to adjust the microstructure and thus the mechanical properties of the final product. In particular, so-called AHSS (= advanced high strength steels) require more and more cooling intensity and cooling flexibility. These requirements are met by intensive cooling. For intensive cooling, the lower spray bar must be designed differently than for laminar cooling. In particular, the lower spray bar must be sized larger. Furthermore, the lower spray bar must cope with the higher pressures occurring during intensive cooling.

In the prior art, a lower spray bar for intensive cooling is known. The known spray bar fills the entire space between immediately adjacent transport rollers. This hinders the outflow of the sprayed from below on the flat rolling stock coolant. It is therefore a significant amount of coolant required to achieve a certain cooling effect.

The object of the present invention is to design a cooling section of the type mentioned above in such a way that the coolant injected from below onto the flat rolling stock can be discharged in a simple manner.

The object is achieved by a cooling section with the features of claim 1. Advantageous embodiments of the cooling section are the subject of the dependent claims 2 to 12.

• dass der mindestens eine untere Spritzbalken einen unterhalb der Transportrollen angeordneten Basisblock aufweist, in den ein flüssiges Kühlmittel eingespeist wird,
• dass von dem Basisblock eine Anzahl von Führungsabschnitten nach oben in Zwischenräume zwischen den Transportrollen hineinragt,
• dass die Führungsabschnitte ein oberes Abschlusselement aufweisen, an dem Spritzdüsen angeordnet sind, mittels derer das in den Basisblock eingespeiste Kühlmittel von unten auf das flache Walzgut aufgespritzt wird,
• dass die Führungsabschnitte in Transportrichtung des flachen Walzguts gesehen eine jeweilige Länge aufweisen und
• dass die Längen sich zumindest in der Nähe der jeweiligen oberen Abschlusselemente in Richtung auf das jeweilige obere Abschlusselement zu verringern.

According to the invention, a cooling section of the aforementioned type is thereby further developed,

• the at least one lower spray bar has a base block arranged below the transport rollers, into which a liquid coolant is fed,
• a number of guide sections projecting upwards from the base block into spaces between the transport rollers,
• in that the guide sections have an upper closing element, on which spray nozzles are arranged, by means of which the coolant fed into the base block is sprayed from below onto the flat rolling stock,
• that the guide sections seen in the transport direction of the flat rolled material have a respective length and
• that the lengths decrease at least in the vicinity of the respective upper end elements in the direction of the respective upper end element.

As a result of the tapering of the first outer dimensions according to the invention, it can be achieved that the lengths of the guide sections in the region of the transport rollers are significantly smaller than the spacing of the directly adjacent transport rollers from one another.

It is possible that the guide sections taper as seen over their entire vertical extent. Alternatively, it is possible that the lengths of the guide portions near the base block are constant.

In a preferred refinement of the cooling section according to the invention, it is provided that the guide sections each have a lower part adjacent to the base block and a upper part containing the respective upper end element, that the lengths of the guide sections in the region of the respective lower part are constant, that the lengths of the guide sections are in the To reduce the region of the respective upper part to the respective upper end element and that the respective lower part and the respective upper part are screwed together. By this configuration, in particular the ease of installation and maintenance can be increased.

In a particularly preferred embodiment of the cooling section according to the invention, in addition to a tapering of the lengths, it is provided that the guide sections have a respective width in the direction of the roller axes, that the widths in the area of the respective lower part are constant and that the widths are in the region of the respective upper part to reduce towards the respective upper end element.

This embodiment - namely the reduction of the widths - is also feasible from the point of view, if the guide sections are not divided into lower parts and upper parts. In this case, the widths decrease at least in the vicinity of the respective upper end element in the direction of the respective upper end element.

Preferably, the spray nozzles are screwed into the respective upper end element.

The arranged on the upper end elements spray nozzles generally comprise a plurality of rows of spray nozzles, in particular at least two outer rows of spray nozzles, which are seen in the transport direction of the flat rolled material arranged one behind the other. The spray nozzles of the outer rows have a respective main spray direction having a vertically upwardly directed vertical component. In a preferred embodiment of the present invention, the main injection directions additionally have a respective horizontal component. The horizontal components of the main injection directions of the outer rows of spray nozzles are directed away from each other in this case.

It is possible that the spray nozzles arranged on the upper end elements comprise (in addition) at least one middle row of spray nozzles arranged between the outer rows of spray nozzles when viewed in the transport direction of the flat rolled stock. In this case, the spray nozzles of the middle row preferably have a main spray direction which is directed purely vertically from bottom to top.

It is possible for the lengths to decrease in steps towards the respective upper end member. Preferably, however, the lengths are continuously reduced.

Preferably, struts are arranged at least in the base block. As a result, the base block pressure loads - even changing pressure loads by the switching on and off of the lower spray bar - better cope. If appropriate, struts can also be arranged in or on the guide sections.

It is preferably provided that the liquid coolant is fed into the base block parallel to the direction of the roller axes. This simplifies the structural design of the lower spray bar.

As a rule, in addition to the lower spray bar, at least one upper spray bar is arranged above the pass line, into which a liquid coolant is likewise fed and on the underside of which further spray nozzles are arranged, by means of which the coolant fed into the upper spray bar from above onto the flat Rolled material is sprayed.

FIG 1

eine Kühlstrecke von der Seite,

FIG 2

die Kühlstrecke von FIG 1 von oben,

FIG 3

eine Teilansicht der Kühlstrecke von FIG 1 von der Seite,

FIG 4

einen Führungsabschnitt aus einer Transportrichtung eines Walzguts gesehen und

FIG 5

vergrößert den oberen Teil eines Führungsabschnitts von der Seite gesehen.

The above-described characteristics, features and advantages of this invention, as well as the manner in which they are achieved, will become clearer and more clearly understood in connection with the following description of the embodiments, which will be described in more detail in conjunction with the drawings. Here are shown in a schematic representation:

FIG. 1

a cooling section from the side,

FIG. 2

the cooling section of FIG. 1 from above,

FIG. 3

a partial view of the cooling section of FIG. 1 of the page,

FIG. 4

a guide section seen from a transport direction of a rolling stock and

FIG. 5

increases the upper part of a guide section seen from the side.

According to the 1 to 3 For example, a cooling section for a flat rolling stock 1 has a frame construction 2. In the frame structure 2, a plurality of transport rollers 3 is arranged. The transport rollers 3 are arranged one behind the other in a transport direction x for the flat rolling stock 1. Immediately adjacent transport rollers seen in the transport direction x 3 have a respective distance a from each other. The transport rollers 3 are rotatably supported in the frame structure 2 about a respective roller axis 4. The roller axes 4 are orthogonal to the transport direction x. They continue to run horizontally. The transport rollers 3 thereby form a (horizontal) passline 5 for the flat rolling stock 1.

Below the passline 5, a lower spray bar 6 is arranged. Most are several lower spray bar 6 available. The following explanations, in which reference is made to the lower spray bar 6 and its components are therefore to be understood as purely exemplary.

The lower spray bar 6 has a base block 7. The base block 7 is arranged below the transport rollers 3. In the base block 7, a liquid coolant 8 is fed. In principle, the feeding of the liquid coolant 8 into the base block 7 from any direction is possible. Preferably, the liquid coolant 8 becomes, as in FIG. 2 is indicated by a correspondingly designated arrow, fed parallel to the direction of the roller axes 4 in the base block 7. At least in the base block 7 struts are preferably arranged (not shown in the FIG). If necessary, 9 struts can also be arranged in or on the guide sections. These struts are not shown in the FIG.

From the base block 7, a number of guide portions 9 project upwardly into spaces between the transport rollers 3. Usually several guide sections 9 are present. Below - representative of all guide sections 9 - only one of the guide sections 9 and its components referred. However, the corresponding embodiments are valid for all guide sections 9.

The guide section 9 has according to FIG. 3 an upper end element 10. At the final element 10 spray nozzles 11 are arranged. By means of the spray nozzles 11 is the liquid coolant 8, which was previously fed into the base block 7, sprayed from below onto the flat rolling stock 1. The spray nozzles 11 may in particular be screwed into the upper end element 10.

Viewed in the transport direction x of the flat rolling stock 1, the guide section 9 has a length l. The length l varies in the vertical direction. In particular, the length l decreases at least in the vicinity of the upper end element 10 in the direction of the upper end element 10. Preferably, a stepless reduction of the length l takes place. A first inclination angle α, which forms the course of the length l with the vertical direction, is usually between 3 ° and 10 °, for example at 4 ° to 7 °. Due to the reduction of the length l can be achieved in particular that the length l of the guide portion 9 in the region of the transport rollers 3 is significantly smaller than the distance a of the two immediately adjacent transport rollers 3 from each other. In particular, the length l in this area is preferably at most 80% of the distance a. It can also be even smaller, for example, only up to 50% of the distance a.

It is possible that the length l is reduced over the entire height of the guide sections 9. Preferably, however, the length l in the vicinity of the base block 7 is constant. You can already there, as in FIG. 3 shown, smaller than the distance a of the two immediately adjacent transport rollers 3 from each other. However, this is not mandatory.

According to FIG. 3 the guide section 9 has a base 12 adjacent to the base block 7. The guide section 9 furthermore has an upper part 13. The upper part 13 contains the upper end element 10. The lower part 12 and the upper part 13 are bolted together via screw 14. In the region of the lower part 12, the length l is preferably constant. In the region of the upper part 13, on the other hand, the length l decreases towards the upper end element 10.

The guide section 9 has according to FIG. 4 seen in the direction of the roller axes 4 a width b. The width b is preferably reduced analogously to the length l also in the vicinity of the upper end element 10 in the direction of the upper end element 10. In the case of the division of the guide section 9 into the lower part 12 and the upper part 13, the length l is preferably constant in the region of the lower part 12. In the region of the upper part 13, on the other hand, the width b decreases in the direction of the upper end element 10.

Analogous to the length l is preferably carried out a stepless reduction of the width b. A second inclination angle β, which forms the course of the width b with the vertical direction, is generally between 5 ° and 15 °, for example at 7 ° to 12 °.

According to FIG. 5 The injection nozzles 11 arranged on the upper closing element 10 each comprise at least two outer rows 11a of spray nozzles 11. The outer rows 11a are arranged one behind the other in the transporting direction x. In addition, at least one middle row 11 b of spray nozzles 11 may be present. If the middle row 11b of spray nozzles 11 is present, it is arranged in the transporting direction x between the outer spray nozzles 11a.

The spray nozzles 11 of the outer rows 11a have according to FIG. 5 a respective main spray direction 15. The main spray directions 15 have a (common) vertical component, which is - of course - directed from bottom to top. The main spray directions 15 of the outer rows 11a of spray nozzles 11 are in accordance with FIG. 5 Furthermore, a respective horizontal component. The horizontal components of the main spray directions 15 of the outer rows 11a of spray nozzles 11 are obviously directed away from one another.

The spray nozzles 11 of the middle row 11b also have a respective main spray direction. The main spray direction of the spray nozzles 11 of the middle row 11b is in FIG FIG. 5 not provided with a reference numeral. The main injection direction of the middle Row 11b of spray nozzles 11 is usually purely vertical from bottom to top.

Above, only the lower spray bar 6 and its structure has been explained in detail. As a rule, according to the illustration in FIG. 1 in addition to the lower spray bar 6 above the passline 5 (at least) an upper spray bar 16 is arranged. In the upper spray bar 16, a liquid coolant 8 is also fed. The upper spray bar 16 has on its underside further spray nozzles - to distinguish them from the spray nozzles 11 of the lower spray bar 6 with the reference numeral 17. By means of the spray nozzles 17 of the upper spray bar 16, the injected into the upper spray bar 16 coolant 8 is sprayed from above onto the flat rolling stock 1.

The present invention has many advantages. In particular, the coolant consumption of the lower spray bar 6 can be significantly reduced. There are savings of coolant 8 of about 40% to about 50% possible.

Although the invention has been further illustrated and described in detail by the preferred embodiment, the invention is not limited by the disclosed examples, and other variations can be derived therefrom by those skilled in the art without departing from the scope of the invention. LIST OF REFERENCE NUMBERS 1 flat rolling stock 2 frame construction 3 transport wheels 4 roller axles 5 pass Line 6 lower spray bar 7 basic block 8th liquid coolant 9 guide sections 10 upper end element 11, 17 spray nozzles 11a, 11b Rows of spray nozzles 12 lower part 13 top 14 screw 15 Main injection directions 16 upper spray bar a distances b width l length x transport direction α first inclination angle β second inclination angle

Claims (14)

Cooling section for a flat rolling stock (1), - wherein the cooling section has a frame construction (2), in which in a transport direction (x) for the flat rolling stock (1) seen in succession a plurality of transport rollers (3) is arranged, - where immediately seen in the transport direction (x) immediately adjacent transport rollers (3) have a respective distance (a) from each other, - wherein the transport rollers (3) are rotatably mounted in the frame structure (2) about a respective roller axis (4), - The roller axes (4) orthogonal to the transport direction (x) and extend horizontally, so that the transport rollers (4) form a pass line (5) for the flat rolling stock (1), - wherein below the pass line (5) at least one lower spray bar (6) is arranged, - wherein the at least one lower spray bar (6) has a base block (7) arranged below the transport rollers (3), into which a liquid coolant (8) is fed, wherein a number of guide sections (9) of the base block (7) project upwards into intermediate spaces between the transport rollers (3), - wherein the guide portions (9) have an upper end element (10) are arranged on the spray nozzles (11) by means of which in the base block (7) fed coolant (8) is sprayed from below onto the flat rolling stock (1), - wherein the guide sections (9) in the transport direction (x) of the flat rolling stock (1) have a respective length (l), - wherein the lengths (l) at least in the vicinity of the respective upper end elements (10) in the direction of the respective upper end element (10) to reduce. Cooling section according to claim 1,
characterized,
that the lengths (l) of the guide sections (9) in the region of Transport rollers (3) are significantly smaller than the distance (a) of the immediately adjacent transport rollers (3) from each other. Cooling section according to claim 1 or 2,
characterized,
in that the lengths (l) of the guide sections (9) in the vicinity of the base block (7) are constant. Cooling section according to claim 3,
characterized,
that the guide sections (9) each having a to the base block (7) adjoining the lower part (12) and a the respective upper closure member (10) containing the upper part (13), that the lengths (l) of the guide sections (9) in the region of the respective Bottom parts (12) are constant, that the lengths (1) of the guide portions (9) in the region of the respective upper part (13) to reduce the respective upper end element (10) and that the respective lower part (12) and the respective upper part ( 13) are screwed together. Cooling section according to claim 4,
characterized,
that the guide sections (9) have a respective width (b) in the direction of the roller axes (4), that the widths (b) in the area of the respective lower part (12) are constant and that the widths (b) are in the region of the respective one Upper part (13) towards the respective upper end element (10) to reduce. Cooling section according to claim 1, 2 or 3,
characterized,
in that the guide sections (9) have a respective width (b) in the direction of the roller axes (4) and that the widths (b) extend at least in the vicinity of the respective upper end element (10) in the direction of the respective upper end element (10). to reduce. Cooling section according to one of the above claims,
characterized,
that the spray nozzles (11) are screwed into the respective upper closure member (10). Cooling section according to one of the above claims, characterized that the spray nozzles (11) arranged on the upper end elements (10) each comprise at least two outer rows (11a) of spray nozzles which are arranged one behind the other in the transport direction (x) of the flat rolled stock (1), in that the spray nozzles (11) of the outer rows (11a) have a respective main spray direction (15), - That the main spray directions (15) have a vertically directed from below upwards component and a respective horizontal component and that the horizontal components of the main spray directions (15) of the outer rows (11 a) of spray nozzles (11) are directed away from each other. Cooling section according to claim 8,
characterized, in that the spray nozzles arranged on the upper end elements (10) comprise at least one middle row (11b) of spray nozzles (11) which, viewed in the transport direction (x) of the flat rolled stock (11), is located between the outer rows (11a) of spray nozzles (11 ), and - That the spray nozzles (11) of the middle row (11 b) have a main spray direction, which is directed purely vertically from bottom to top. Cooling section according to one of the above claims,
characterized,
that the lengths (l) reducing (10) to continuously in the direction of the respective upper closure member. Cooling section according to one of the above claims,
characterized,
that struts are arranged at least in the base block (7). Cooling section according to claim 11,
characterized,
in that struts are also arranged in or on the guide sections (9). Cooling section according to one of the above claims,
characterized,
in that the liquid coolant (8) is fed into the base block (7) parallel to the direction of the roller axes (4). Cooling section according to one of the above claims,
characterized,
that above the pass line (5) at least one upper spray bar (16) is arranged, in which also a liquid coolant (8) is fed and on the underside of further spray nozzles (17) are arranged, by means of which in the upper spray bar (16) fed coolant (8) from above onto the flat rolling stock (1) is sprayed.

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