A device for preventing strip head camber in a finishing mill train

Abstract

This utility model discloses a device for preventing strip steel from warping on a finishing mill, relating to the field of metal rolling technology. The device includes a base plate, a support, guide rails, a manifold, and water nozzles. The base plate is mounted on the support frame of the finishing mill, the support and manifold are mounted on the base plate, and the water nozzles are mounted on the manifold and connected to the cooling water pipeline of the work rolls. Two guide rails are installed parallel to form a strip steel movement channel, with a strip steel support platform on the inner side. The manifold is located on the channel outlet side. Water is sprayed onto the lower surface of the strip steel through the water nozzles to cool it, reducing the temperature difference between the upper and lower surfaces, uniformly reducing deformation resistance, avoiding quality defects and steel pile-up accidents caused by strip steel warping, and ensuring production continuity and stability. The device can adjust the guide rail spacing and overall position via guide rails and hydraulic cylinders to adapt to different specifications of strip steel.

Description

Technical Field

[0001] This utility model relates to the field of metal rolling technology, and more specifically, to a device for preventing strip steel from curling up on a finishing mill. Background Technology

[0002] In the hot-rolled thick plate rolling process, strip head warping is a common phenomenon. In severe cases, the warped head impacts the finishing mill work rolls, causing damage and pitting defects. The warped head may even crawl along the front guard plate of the finishing mill, resulting in serious steel pile-up accidents. Analysis shows that the fundamental cause of warping is the temperature difference between the upper and lower surfaces of the slab in the heating furnace, and the different heat dissipation conditions on the upper and lower surfaces during production. The lower surface temperature of the slab is higher than the upper surface temperature. Essentially, because the lower surface temperature is higher, the surface deformation resistance is lower than that of the lower surface temperature, resulting in greater extension on the lower surface than on the upper surface. This leads to uneven internal stress and asymmetrical deformation during metal flow, causing the strip head to warp. Pitting defects caused by the strip head impacting the work rolls in thicker products cannot be eliminated through rework and must be replaced with contracted products. Furthermore, on-site steel pile-up accidents caused by warping are difficult to handle, taking more than two hours to resolve, posing a significant threat to the smooth operation of the production line and the safe operation of equipment. Utility Model Content

[0003] In response to the aforementioned technical problem, a device is provided to prevent strip steel from curling up in a finishing mill.

[0004] The technical means adopted in this utility model are as follows:

[0005] A device for preventing strip steel from tilting upwards in a finishing mill includes a pad, a bracket, guide rulers, a manifold, and a water nozzle. The pad is installed on the support frame of the finishing mill, the bracket and the manifold are installed on the pad, the water nozzle is installed on the manifold, and the manifold is connected to the cooling water pipeline of the work roll. Two guide rulers are installed parallel to each other on the bracket to form a strip steel moving channel. Each of the two guide rulers has a strip steel support platform on its opposite side, and the manifold is located on the outlet side of the strip steel moving channel.

[0006] Furthermore, a first guide rail is installed on the bracket perpendicular to the direction of strip movement, two guide rulers are slidably installed on the first guide rail, and two first hydraulic cylinders are installed on the bracket parallel to the first guide rail. The two guide rulers are respectively connected to the output end of the corresponding first hydraulic cylinder through connecting blocks.

[0007] Furthermore, it also includes a second guide rail and a second hydraulic cylinder. The second guide rail is installed on the support frame of the finishing mill parallel to the direction of strip movement. The second guide rail is perpendicular to the first guide rail in the horizontal direction. A pad is slidably installed on the second guide rail. The second hydraulic cylinder is installed on the support frame of the finishing mill. The pad is connected to the output end of the second hydraulic cylinder.

[0008] Furthermore, a third guide rail is installed on the bracket parallel to the first guide rail, and a guide ruler is slidably installed on the third guide rail.

[0009] Furthermore, guide plate liner is installed on the inner side of each of the two guide rulers.

[0010] Furthermore, the diameter of the manifold is φ55-65mm, and the flow rate inside the manifold is 38-50L / min.

[0011] Furthermore, the water nozzle has a scattering angle of 30-45°, a deflection angle of 5-20°, and a spray water pressure of 8-12 bar.

[0012] Furthermore, the number of water taps is 20.

[0013] Compared with the prior art, the present invention has the following advantages:

[0014] By installing a manifold and water nozzles below the outlet of the strip moving channel formed by the guide ruler, water is sprayed onto the lower surface of the strip to cool it down, reduce the temperature difference between the upper and lower surfaces, and even out the deformation resistance of the upper and lower surfaces. This achieves relatively consistent deformation during the finishing rolling deformation process, allowing the strip to bite straight into each stand of the finishing rolling mill. This avoids quality defects and steel piling accidents caused by strip curling, and ensures the continuity and stability of hot rolling on-site production. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a front view of a device for preventing strip steel from curling up in a finishing mill, according to the present invention.

[0017] Figure 2 This is a side view of a device for preventing strip steel from curling up in a finishing mill, according to the present invention.

[0018] Figure 3 This is a top view of a device for preventing strip steel from warping up in a finishing mill, according to the present invention.

[0019] In the diagram: 1. Pad; 2. Bracket; 3. Guide ruler; 4. Manifold; 5. Water nozzle; 6. Support frame; 7. Steel strip support platform; 8. First guide rail; 9. First hydraulic cylinder; 10. Connecting block; 11. Second guide rail; 12. Second hydraulic cylinder; 13. Guide ruler liner; 14. Third guide rail. Detailed Implementation

[0020] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other. The present utility model will now be described in detail with reference to the accompanying drawings and embodiments.

[0021] This utility model discloses a device for preventing strip steel from warping on the finishing mill. The installation position is selected between the F1-F2 finishing mill and between the F2-F3 finishing mill, where the deformation of the intermediate billet is the largest and the warping phenomenon is the most severe, allowing for quick adjustment. At the same time, after passing through the F3 finishing mill, the steel plate thickness is reduced and the temperature difference between the upper and lower surfaces is more uniform. Considering the impact on production stability, this device is not installed on the support frame of the finishing mill after the F3 finishing mill. The device's configuration position is intuitive and maintenance is convenient.

[0022] like Figure 1-3 As shown, the device includes a base plate 1, a support 2, a guide ruler 3, a manifold 4, and water nozzles 5. The base plate 1 is installed on the support frame 6 of the finishing mill. The support 2 and the manifold 4 are installed on the base plate 1. The water nozzles 5 are installed on the manifold 4, and there are 20 water nozzles 5. The manifold 4 is connected to the cooling water pipeline of the work roll. The length of the manifold is to reach the maximum rollable width of 2150mm of the mill, ensuring that products of all widths can be covered. The diameter of the manifold 4 is φ55-65mm, the flow rate in the manifold 4 is 38-50L / min, the scattering angle of the water nozzles 5 is 30-45°, and the deflection angle of the water nozzles 5 is 5-20° to reduce the mutual interference between the jets and affect the cooling effect, ensuring that the cooling water can cover the entire strip surface. The spray water pressure of the water nozzles 5 is 8-12 bar, ensuring that the forced cooling water can be sprayed onto the lower surface of the strip for forced cooling, while also inhibiting the formation of iron oxide scale on the lower surface. The above data are based on experimental data. The table below shows the water flow rate and pressure test results obtained during the experiment:

[0023]

[0024] Two guide rulers 3 are mounted parallel to each other on the bracket 2 to form a strip steel movement channel. Each guide ruler 3 has a strip steel support platform 7 on its opposite side for supporting the strip steel. Guide ruler liners 13, made of high-temperature resistant material, are installed on the inner side of each guide ruler 3 and are in direct contact with the strip steel. The manifold 4 is located on the outlet side of the strip steel movement channel. A first guide rail 8 is mounted perpendicular to the strip steel movement direction on the bracket 2. The two guide rulers 3 are slidably mounted on the first guide rail 8. Two first hydraulic cylinders 9 are mounted parallel to the first guide rail 8 on the bracket 2. The two guide rulers 3 are connected to the output end of the corresponding first hydraulic cylinder 9 via connecting blocks 10. The extension and retraction of the first hydraulic cylinders 9 causes the guide rulers 3 to slide on the first guide rail 8, thereby adjusting the distance between the two guide rulers 3 to accommodate strip steel of different widths.

[0025] The device also includes a second guide rail 11 and a second hydraulic cylinder 12. The second guide rail 11 is mounted parallel to the strip movement direction on the support frame 6 of the finishing mill. A pad 1 is slidably mounted on the second guide rail 11, and the second hydraulic cylinder 12 is mounted on the support frame 6 of the finishing mill. The pad 1 is connected to the output end of the second hydraulic cylinder 12. With the help of the second hydraulic cylinder 12, the pad 1 can slide on the second guide rail 11, thereby driving the entire device to move along the strip movement direction, facilitating the adjustment of the device's position according to actual production needs. A third guide rail 14 is mounted parallel to the first guide rail 8 on the bracket 2, and a guide ruler 3 is slidably mounted on the third guide rail 14, further enhancing the stability of the guide ruler 3 during sliding.

[0026] In actual operation, the strip moves along the strip movement channel formed by the two guide rulers 3. When the strip experiences severe head tilting as it is about to exit the channel and enter the finishing mill, the operator can manually open the valve switch. The water nozzles 5 on the manifold 4 will spray water onto the lower surface of the strip to cool it down. This reduces the temperature difference between the upper and lower surfaces of the strip, making the deformation resistance more uniform. This allows the strip to achieve relatively consistent deformation during the finishing mill process, ensuring that the strip bites straight into each stand of the finishing mill. This effectively avoids quality defects and steel piling accidents caused by strip head tilting, and ensures the continuity and stability of hot rolling production.

[0027] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A device for preventing strip steel from warping at the top of a finishing mill, characterized in that, The device includes a pad (1), a bracket (2), guide rulers (3), a manifold (4), and a water nozzle (5). The pad (1) is installed on the support frame (6) of the finishing mill. The bracket (2) and the manifold (4) are installed on the pad (1). The water nozzle (5) is installed on the manifold (4). The manifold (4) is connected to the cooling water pipeline of the work roll. Two guide rulers (3) are installed in parallel on the bracket (2) to form a strip steel moving channel. Each of the two guide rulers (3) has a strip steel support platform (7) on its opposite side. The manifold (4) is located on the outlet side of the strip steel moving channel.

2. The device for preventing strip steel from warping up in a finishing mill according to claim 1, characterized in that, The bracket (2) is mounted on a first guide rail (8) perpendicular to the direction of strip movement. Two guide rulers (3) are slidably mounted on the first guide rail (8). Two first hydraulic cylinders (9) are mounted on the bracket (2) parallel to the first guide rail (8). The two guide rulers (3) are respectively connected to the output end of the corresponding first hydraulic cylinder (9) through a connecting block (10).

3. The device for preventing strip steel from warping up in a finishing mill according to claim 1, characterized in that, It also includes a second guide rail (11) and a second hydraulic cylinder (12). The second guide rail (11) is installed on the support frame (6) of the finishing mill unit parallel to the strip moving direction. The pad (1) is slidably installed on the second guide rail (11). The second hydraulic cylinder (12) is installed on the support frame (6) of the finishing mill unit. The pad (1) is connected to the output end of the second hydraulic cylinder (12).

4. The device for preventing strip steel from warping up in a finishing mill according to claim 2, characterized in that, The bracket (2) is equipped with a third guide rail (14) parallel to the first guide rail (8), and the guide ruler (3) is slidably installed on the third guide rail (14).

5. The device for preventing strip steel from warping up in a finishing mill according to claim 1, characterized in that, Guide ruler liner plates (13) are installed on the inner sides of each of the two guide rulers (3).

6. The device for preventing strip steel from warping up in a finishing mill according to claim 1, characterized in that, The diameter of the manifold (4) is φ55-65mm, and the flow rate inside the manifold (4) is 38-50L / min.

7. The device for preventing strip steel from warping up in a finishing mill according to claim 1, characterized in that, The water nozzle (5) has a scattering angle of 30-45°, a deflection angle of 5-20°, and a spray water pressure of 8-12 bar.

8. The device for preventing strip steel from warping up in a finishing mill according to claim 1, characterized in that, The number of the water taps (5) is 20.

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