EP2978545B1 - Cooling section with lower spray bar - Google Patents

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. It serves to specifically adjust the microstructure and thus the mechanical properties of the end 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.

From the DE 102 15 229 A1 a cooling section for a flat rolling stock is known, in which the cooling section has a frame construction, in which, viewed in a transport direction for the flat rolling stock, a plurality of transport rollers is arranged behind one another. Immediately adjacent transport rollers seen in the transport direction have a respective distance from each other. 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. Below the passline at least one lower spray bar is arranged, which has a base block arranged below the transport rollers, into which a liquid coolant is fed. The lower spray bar has a base body that tapers towards its top. On its upper side, the base body bores, in which spray tubes are inserted, which are closed at the top by a nozzle. The spray tubes have a constant cross section.

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 13.

• 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,
• 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.

By means 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 amount to a maximum of 80% of the distance of the directly adjacent transport rollers from one another.

In a preferred embodiment of the cooling section according to the invention it is provided that the guide sections each a lower part adjoining the base block and an upper part containing the respective upper end element have the lengths of the guide sections in the region of the respective lower part being constant, reducing the lengths of the guide sections in the region of the respective upper part to the respective upper end element and 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, viewed in the direction of the roller axes, have a respective width,

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 passline, into which 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 is directed from above onto the flat spray bar 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 (13)

1. Cooling section for a flat rolled material (1),

   - wherein the cooling section has a structural frame (2) in which is arranged a plurality of transport rollers (3) which are one behind another looking in the direction of transport (x) of the flat rolled material (1),

   - wherein, looking in the direction of transport (x), immediately neighbouring transport rollers (3) are in each case separated by a gap (a),

   - wherein each of the transport rollers (3) is mounted in the structural frame (2) so that it can rotate about a roller axis (4),

   - wherein the roller axes (4) are aligned orthogonally to the direction of transport (x) and horizontally, so that the transport rollers (4) form a pass-line (5) for the flat rolled material (1),

   - wherein at least one lower spray bar (6) is arranged underneath the pass-line (5),

   - wherein the at least one spray bar (6) has a base block (7) arranged underneath the transport rollers (3), into which is fed a liquid coolant (8),

   - wherein a number of feeder sections (9) project upwards from the base block (7) into spaces between the transport rollers (3),

   - wherein the feeder sections (9) have an upper closing element (10), on which are arranged spray nozzles (11), by means of which the coolant (8) fed into the base block (7) is sprayed from below onto the flat rolled material (1),

   - wherein each of the feeder sections (9) has a width (1) looking in the direction of transport (x) of the flat rolled material (1),

   - wherein, at least in the neighbourhood of the relevant upper closing elements (10), the widths (1) reduce in the direction towards the upper closing element (10) concerned.
2. Cooling section according to claim 1,
   characterised in that,
   in the region of the transport rollers (3) the widths (1) of the feeder sections (9) are preferably at most 80% of the size of the gap (a) between the immediately neighbouring transport rollers (3).
3. Cooling section according to claim 1 or 2,
   characterised in that,
   each of the feeder sections (9) has an lower part (12) abutting onto the base block (7) and an upper part (13) which contains the relevant closing element (10), in the region of the relevant lower part (12) the widths (1) of the feeder sections (9) are constant, in the region of the applicable upper part (13) the widths (1) of the feeder sections (9) reduce towards the relevant upper closing element (10), and the relevant lower part (12) and the relevant upper part (13) are bolted together.
4. Cooling section according to claim 3,
   characterised in that,
   looking in the direction of the roller axes (4), each of the feeder sections (9) has a breadth (b), in the region of the lower part (12) concerned the breadths (b) are constant, and in the region of the upper part (13) concerned the breadths (b) reduce in the direction towards the relevant upper closing element (10).
5. Cooling section according to claim 1 or 2,
   characterised in that,
   looking in the direction of the roller axes (4), each of the feeder sections (9) has a breadth (b) and, at least in the neighbourhood of the upper closing element (10) concerned, the breadths (b) reduce in the direction towards the relevant upper closing element (10).
6. Cooling section according to one of the above claims,
   characterised in that,
   the spray nozzles (11) are screwed into the relevant upper closing element (10).
7. Cooling section according to one of the above claims,
   characterised in that,

   - the spray nozzles (11) which are arranged on the upper closing element (10) include in each case at least two outer rows (11a) of spray nozzles, which are arranged one behind another when looking in the direction of transport (x) of the flat rolled material (1),

   - each of the spray nozzles (11) in the outer rows (11a) has a principal spray direction (15),

   - the principal spray directions (15) have a vertical component oriented upwards from below and in each case a horizontal component, and the horizontal components of the principal spray directions (15) of the outer rows (11a) of spray nozzles (11) are oriented away from each other.
8. Cooling section according to claim 7,
   characterised in that,

   - the spray nozzles arranged on the upper closing elements (10) include at least one central row (11b) of spray nozzles (11) which, looking in the direction of transport (x) of the flat rolled material (1), is arranged between the outer rows (11a) of spray nozzles (11), and

   - the spray nozzles (11) of the central row (11b) have a principal spray direction which is oriented purely vertically upwards from below.
9. Cooling section according to one of the above claims
   characterised in that,
   the widths (1) reduce steplessly in the direction towards the relevant upper closing element (10).
10. Cooling section according to one of the above claims
    characterised in that,
    at least in the base block (7), strengthening ribs are arranged.
11. Cooling section according to claim 10,
    characterised in that,
    strengthening ribs are also arranged in or on the feeder sections (9).
12. Cooling section according to one of the above claims
    characterised in that,
    the liquid coolant (8) is fed into the base block (7) parallel to the direction of the roller axes (4).
13. Cooling section according to one of the above claims
    characterised in that,
    above the pass-line (5) is arranged at least one upper spray bar (16), into which is also fed a liquid coolant (8) and on the underside of which are arranged further spray nozzles (17), by means of which the coolant (8) fed into the upper spray bars (16) is sprayed from above onto the flat rolled material (1).

Images