Variable cooling system for strip and roller

Abstract

The invention relates to a variable cooling system for strips and rolls. The invention relates to a nozzle bar (1) having a plurality of lateral outlets (3) through which a fluid (4) can be applied to a roll (5) or a rolled stock (6). Wherein the nozzle bar has an elongated bore (8) which extends axially within the nozzle bar and which communicates with the lateral outlet of the nozzle bar via a transverse channel (9). According to the invention, a control tube (10) is provided in the elongated bore, which control tube has a lateral opening (11) in a tube housing (12) such that the lateral opening of the control tube at least partially releases the opening (14) to the transverse channel by means of a rotation or axial movement of the control tube in the elongated bore.

Description

Technical Field

[0001] The subject of this invention comprises a nozzle beam with multiple lateral outlets through which fluid is sprayed or blown onto rolls or workpieces (e.g., strip). Here, the nozzle beam has a fluid connection on its end side through which fluid is supplied to elongated orifices running inside the nozzle beam and reaches the lateral outlets via transverse channels.

[0002] The subject matter of the invention also comprises a method for adjusting the mass flow rate of fluid flowing toward the respective lateral outlets of the nozzle beam. Background Technology

[0003] Nozzle beams are used within rolling mills, for example, to cool or lubricate rolls or rolled products, such as strip or sheet. Oil, water, or emulsions are commonly used as cooling or lubricating media. Nozzle beams can also be used as blowing or drying devices, for which air or other gases are typically used as the fluid.

[0004] Especially in reducing mills (Reduzierwalzwerken), strip cooling is a critical issue. Effective cooling has a significant impact on product quality (surface finish) and yield (production efficiency). The strip must be dried again after the roll gap. To this end, it is worth exploring the possibility of applying all the cooling medium (e.g., oil) at the mill stand entrance, since any that is not sprayed at the exit does not need to be removed during subsequent strip drying.

[0005] One major problem is that the nozzles used to lubricate or cool the roll gap spray oil from the side of the strip into the outlet.

[0006] Although this situation can be avoided by precisely matching the length of the spray beam and the width of the strip, in practice, strips of different widths are often processed using the same rolling mill.

[0007] Furthermore, it is advantageous that the flow rate through individual nozzles can be adjusted or controlled, as this allows for varying degrees of cooling across the roll width or strip width. In particular, uniform strip temperature is crucial for the manufacture of electrical strips. Since the strip is typically cooled more intensely in its lateral edge regions due to convection, it is advantageous to apply more cooling medium to the central region of the strip through the nozzles, resulting in the most uniform temperature possible across the strip width.

[0008] Spray beam systems for selectively cooling or lubricating rolls or strips are known in the prior art. For example, EP 4232 215 B1 describes a modular spray beam system in which the spray beams can be individually assembled from individual modules and thus matched to the corresponding strip width. However, this system has a complex structure.

[0009] As is also known from EP 4 232 215 B1, individual nozzles or nozzle groups can be individually controlled via integrated control valves. However, such solutions are expensive, prone to failure, and often unavailable due to limited installation space. Summary of the Invention

[0010] Therefore, the technical problem to be solved by the present invention is to provide a nozzle beam in which the amount of fluid sprayed or blown can be varied or adjusted within the width range of the strip or roll, wherein the nozzle beam should have a structure that is as simple as possible and saves space.

[0011] This technical problem is solved by the nozzle beam according to the present invention.

[0012] Therefore, according to the present invention, a control tube is provided in the elongated hole of the nozzle beam, the control tube having a plurality of lateral openings in the tube housing, wherein the control tube can rotate and / or move within the elongated hole, such that the lateral openings of the control tube can thereby close or open the openings leading to the transverse channel, thereby adjusting the fluid flow rate (mass flow rate) to the lateral outlet.

[0013] Therefore, the basic concept of the present invention is that an outer hollow body (nozzle beam) with lateral outlets and an inner hollow body (control tube) with control holes or slots (lateral openings) arranged according to a selection can move or rotate relative to each other in order to change the flow cross-section at each lateral outlet of the nozzle beam with specific characteristics. This allows for the realization of a desired geometric control structure.

[0014] If, for example, the holes in the edge region of the control tube are staggered in the circumferential direction, or if the holes in the central region of the control tube are designed to be elongated in the circumferential direction, the external nozzle can be closed by rotating the control tube.

[0015] This type of nozzle beam has a very simple and compact structure.

[0016] Advantageously, the number of lateral openings in the control tube is equal to the number of transverse channels in the nozzle beam.

[0017] Advantageously, the cross-sectional area of ​​the lateral opening in the central region of the control tube is different from, and in particular larger than, the cross-sectional area of ​​the lateral opening in the edge region of the control tube.

[0018] However, it is also possible to design all openings within the control tube to have the same cross-sectional area, but to be staggered circumferentially along the axis of the control tube. Alternatively, the flow openings to the various transverse channels can be opened to varying degrees by rotating the control tube.

[0019] This technical solution also provides the possibility that if a curved geometric control structure is used such that, for example, the flow cross-sectional area gradually increases from the edge region of the nozzle beam toward the center, the coolant supply can vary across the strip width.

[0020] Alternatively, the system can also be used for purging, for example, by adjusting the nozzle beam to purge only the edges of the strip.

[0021] If the geometric control structure descends from the inside out (from the central region to the edge region), the external nozzles can be shut off in a targeted manner.

[0022] Depending on the direction of rotation, the control tube can also have more geometric control structures, such as two or more rows of holes inside the control tube.

[0023] For example, the lateral openings in the central region of the control tube can have an elongated cross-section, while the openings in the edge region have a circular cross-section, so that the lateral channels in the central region of the nozzle beam are released or opened only by the rotation or axial movement of the control tube.

[0024] The slender cross-section with the lateral opening can extend along the circumferential direction of the control tube.

[0025] Alternatively, the opening in the central region of the control tube may have an asymmetrical cross-section, and preferably the lateral outlet also has a different cross-section. In this embodiment, a variety of different adjustment possibilities (geometric control structures) can be achieved by rotating and axially moving the control tube.

[0026] The present invention also relates to a method for adjusting the mass flow rate of fluid leading to each of the lateral outlets of the aforementioned nozzle beam. To adjust the mass flow rate of the fluid leading to the lateral outlets, a control tube is rotated about its longitudinal axis and / or moved within an elongated orifice along its longitudinal axis.

[0027] By superimposing the rotational direction with the axial motion, the geometric control structure can be adjusted in a highly variable manner.

[0028] Preferably, oil, water, emulsion or air is used as the fluid. Attached Figure Description

[0029] Figure 1 A schematic structure of the nozzle beam according to the present invention is shown; Figure 2 A schematic structure of the nozzle beam according to the invention is shown, wherein the control tubes are illustrated separately; Figure 3 Examples of different mass flow rates achievable with the nozzle beam according to the invention are shown; In the corresponding figures, the same reference numerals denote the same parts. Detailed Implementation

[0030] exist Figure 1 The nozzle beam 1 is schematically illustrated. Fluid 4, such as water or oil, is sprayed onto roll 5 or workpiece 6 through side outlet 3 or nozzle 13. In this example, workpiece 6 is a metal strip.

[0031] exist Figure 2 The diagram shows the nozzle beam 1 with the housing partially omitted, making the elongated orifice 8 extending more clearly along the axial direction 2 of the nozzle beam 1. The opening 14 leading to the transverse channel 9 is also clearly visible, through which fluid 4 reaches the lateral outlet 3 and the nozzle 13. The control tube 10 is normally located within the elongated orifice 8, but is shown on the left side of the diagram for clarity. The outer diameter of the control tube 10 is substantially equal to the inner diameter of the elongated orifice 8. The control tube 8 has a housing 12 with multiple lateral openings 11 within it.

[0032] For example, fluid 4, such as oil, water, or air, is supplied to the interior of control tube 10 through end face 7 of nozzle beam 1. Depending on the position of control tube 10 within elongated orifice 8, fluid 4 can reach transverse channel 9 through opening 14.

[0033] In this example, it can be seen that the lateral opening 11 within the control tube 10 is larger in the central region of the control tube 10 than in the edge region. Figure 2 The middle diagram shows the cylindrical outer shell surface between the elongated orifice 8 and the shell 12, thus better understanding the function of the control tube 10. Here, the length L of the control tube 10 is equal to the height of the unfolded cylindrical shell.

[0034] The lateral opening 11 in the housing 12 is shown in black, while the opening 14 leading to the transverse channel 9 is shown in a circle. In this example, the lateral opening 11 of the control tube 10 points upward, while the opening 14 in the elongated orifice points downward. Because openings 11 and 14 do not overlap, fluid cannot flow through the control tube 10 to the transverse channel 9. If the control tube 10 is rotated about its longitudinal axis 15 by an angle Δα = 180° or π, openings 11 and 14 will overlap, and fluid 4 will reach all the transverse channels 9. Because the lateral opening 11 in the central region of the control tube 10 is significantly larger than the opening in the edge region, there exists a rotation angle Δα of the control tube 10 such that fluid only flows to the transverse channels 9 in the central region of the nozzle beam 1. Depending on the shape or cross-section of the lateral opening 11, different mass flow rates Q to the various lateral outlets 3 of the nozzle beam 1 can be achieved for different rotation angles α. These adjustable different mass flow rates Q m Here, for example, the defined rotation angle Δα is illustrated with arrows of different lengths. Different mass flow rates to each nozzle 13 can also be achieved by controlling the axial movement Δz of the control tube 10 within the elongated orifice 8.

[0035] Therefore, the mass flow rate Q exiting lateral outlet 3 m It depends on the rotation angle Δα and the axial movement Δz of the control tube 10.

[0036] exist Figure 3 The following example diagram illustrates four different mass flow rates Q along the length L of the control tube 10. m In this embodiment, the control tube 10 has lateral openings 11 of different sizes, such as in... Figure 2 As shown in the diagram.

[0037] The mass flow rates Q1, Q2, Q3, and Q4 depend on the rotation angle α and axial position z of the control tube 10 within the elongated orifice 8. For mass flow rates Q1 and Q2, the axial position z1 of the control tube 10 is the same, but the corresponding rotation angles α1 and α2 are different. Here, the overlap between the lateral opening 11 in the central region of the control tube 10 and the opening 14 leading to the transverse channel 9 is greater than in the two edge regions. Therefore, the mass flow rate Q in the central region of the injection beam 1 is greater than in the edge regions. This means that more fluid is thus applied to the roll 5 or the workpiece 6 in the central region, and the application of fluid covers the entire length L of the nozzle beam. At the rotation angle α1, the overlap between the opening 11 and the opening 14 of the control tube 10 is greater than at the rotation angle α2, so the mass flow rate Q1 leading to the corresponding lateral outlet 3 is greater than the mass flow rate Q2. For mass flow rates Q3 and Q4, the corresponding rotation angles α1 and α2 are the same as for mass flow rates Q1 and Q2, but now the control tube 10 is located at position z2. Therefore, the control tube 10 moves further along the axial extension direction 2.

[0038] For mass flow rates Q3 and Q4, the control tube 10 is now moved along the axial extension direction 2 such that the lateral opening 11 of the control tube 10 in the edge region no longer overlaps with the opening 14 leading to the transverse channel 9. Therefore, fluid 4 no longer reaches the lateral outlet 3 in the edge region, and the edge nozzle 13 is thus closed. With this adjustment, the edge nozzle 13 can be closed, and more fluid 4 can be applied in the central region. Thus, a curved geometric control structure is achieved here via the control tube 10.

[0039] The embodiments illustrated in the accompanying drawings represent only preferred embodiments of the invention. Of course, by constructing the lateral openings 11 accordingly, along with the corresponding rotation angles α and axial positions z, different mass flow rates Q along the beam length L can be achieved.

[0040] List of reference numerals 1 Nozzle beam 2. Axial extension direction of the nozzle beam 3. Side exit 4. Fluid 5 rolls 6. Rolled products (strip) 7. End side of nozzle beam 1 8. Slender holes 9. Horizontal passage 10 Control tube 11 Lateral opening within the housing 12 of the control tube 10 12 Tube Shell 13 Nozzles 14. Openings leading to transverse passage 9 15. Longitudinal axis of control tube 10 L is the length of control tube 10. Δα rotation angle Q Mass flow rate Q in Mass flow rate supplied to control tube 10 ΣQ n Total mass flow rate through side opening 11 Δz is the movement along the axial direction. x, y, z coordinate system.

Claims

1. A nozzle beam (1) having a plurality of lateral outlets (3) along its axial extension direction (2), through which a liquid or gaseous fluid (4) can be applied to a roll (5) or, for example, a strip (6), wherein, The nozzle beam (1) has a fluid connection on its end face (7), the fluid connection opening into an elongated hole (8) extending in the nozzle beam (1) along the axial extension direction (2), wherein the elongated hole (8) communicates with the lateral outlet (3) of the nozzle beam (1) through an opening (14) leading to a transverse channel (9), characterized in that a control tube (10) is provided in the elongated hole (8), the housing (12) of the control tube having a lateral opening (11) such that rotation or axial movement of the control tube (10) within the elongated hole (8) at least partially releases the opening (14) leading to the transverse channel (9), and thus the mass flow rate (Q) of the fluid (4) leading to the lateral outlet (3) is adjustable.

2. The nozzle beam (1) according to claim 1, characterized in that, The number of lateral outlets (11) of the control tube (10) is equal to the number of transverse channels (9) of the nozzle beam (1).

3. The nozzle beam (1) according to claim 1 or 2, characterized in that, The cross-sectional area of ​​the lateral outlet (11) in the central region of the control tube (10) is different from that of the lateral outlet (11) in the edge region of the control tube (10), and is in particular larger than that of the lateral outlet (11) in the edge region of the control tube (10).

4. The nozzle beam (1) according to any one of claims 1 to 3, characterized in that, The lateral opening (11) in the central region of the control tube (10) has an elongated cross-section, and the lateral opening (11) in the edge region has a circular cross-section, such that the transverse channel (9) in the central region of the nozzle beam (1) is released only by the rotation or axial movement of the control tube (10).

5. The nozzle beam (1) according to claim 4, characterized in that, The elongated cross-section of the lateral opening (11) extends along the circumferential direction of the control tube (10).

6. The nozzle beam (1) according to any one of claims 1 to 3, characterized in that, The lateral opening (11) in the central region of the control tube (10) has an asymmetrical cross-section.

7. A method for adjusting the mass flow rate (Q) of fluid (4) flowing to each lateral outlet (3) of a nozzle beam (1) according to any one of claims 1 to 6, characterized in that, To regulate the mass flow rate (Q) of the fluid (4) toward the lateral outlet (3), the control tube (10) rotates about its longitudinal axis (15) and / or the control tube (10) moves within the elongated orifice (8) along its longitudinal axis (15).

8. The method for adjusting the mass flow rate (Q) of fluid (4) flowing to each lateral outlet (3) according to claim 7, characterized in that, Oil, water, emulsion or air may be used as the fluid (4).

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