Skirt plate device, descaling machine and method for improving hot-rolled strip shape and surface quality

Abstract

The present invention discloses a skirt device, a descaling machine, and a method for improving the shape and surface quality of hot-rolled strip steel. The skirt device includes a skirt beam and an even number of pallets fixedly connected to the skirt beam. The width direction of the skirt beam is arranged in the same direction as the length direction of the pallet. The skirt beam has a target line along the width direction. The even number of pallets are arranged symmetrically about the target line. The cross section of the pallet is perpendicular to the length direction of the pallet. The cross section of the pallet includes a bottom side, a top side, and left and right sides. The width of the bottom side is greater than the width of the top side. The left and right sides are inclined, and the top side is a circular arc transition. The skirt device is used to be installed between the conveyor rollers in the descaling machine. When the pallet is in a horizontal working state, the target line coincides with the longitudinal center line of the descaling machine. Through this device, scratches on the lower surface of the strip and the intrusion of iron oxide scale are effectively avoided, thereby improving the surface quality of the strip steel. The transverse temperature of the strip steel after passing through the descaling machine is made uniform, thereby effectively improving the plate shape.

Description

Technical Field

[0001] The present invention relates to the technical field of strip steel rolling, in particular to a skirt plate device, a descaling machine and a method for improving the shape and surface quality of hot-rolled strip steel. Background Art

[0002] At present, the development momentum of hot strip rolling mills, especially headless thin plate hot rolling mills, is rapid. In order to ensure the quality of the end product of strip steel, descaling machines are indispensable equipment. The skirt plates between the conveyor rollers in the descaling machine are devices that support the strip steel inside the descaling machine.

[0003] The existing technology has the following problems: the structure and position design of the descaling machine skirt are unreasonable, resulting in the accumulation of removed iron oxide scales on the skirt, causing scratches on the intermediate billet and iron oxide scale intrusion, affecting the surface quality of the strip.

[0004] Even due to the shape and position distribution of the support plate on the skirt plate, the high-pressure descaling water sprayed from the header is splashed back to the surface of the intermediate billet, causing the lower surface of the strip to be partially cooled by the splashed high-pressure water, increasing the lateral temperature imbalance of the strip, and further causing uneven lateral deformation of the strip during the subsequent stand rolling process, causing the strip shape to exceed the standard. Summary of the Invention

[0005] In order to solve the above problems, the present application provides a skirt plate device, a descaling machine and a method for improving the shape and surface quality of hot-rolled strip steel.

[0006] The present application provides a skirt device for improving the shape and surface quality of hot-rolled strip steel, the skirt device comprising a skirt beam and an even number of support plates fixedly connected to the skirt beam, the length direction of the support plate being the same as the width direction of the skirt beam, the skirt beam having a target line along the width direction, the even number of support plates being symmetrically arranged on the left and right of the target line, the cross section of the support plate being perpendicular to the length direction of the support plate, the cross section of the support plate comprising a bottom side, a top side and left and right sides, the width of the bottom side being greater than the width of the top side, the left and right sides being inclined, and the top side being a circular arc transition, the skirt device being used to be installed between the conveyor rollers in a descaling machine, and when the support plate is in a horizontal working state, the target line coincides with the longitudinal center line of the descaling machine.

[0007] In some embodiments, the cross section of the support plate is a trapezoid or triangle that is narrow at the top and wide at the bottom, and the upper end of the trapezoid or triangle is an arc transition.

[0008] In some embodiments, an even number of support plates are disposed on the same side of the skirt board crossbeam, and one end of each support plate is fixedly connected to the skirt board crossbeam.

[0009] In some embodiments, the skirt panel device further includes a skirt panel flipping mechanism, which is connected to the skirt panel crossbeam. The skirt panel flipping mechanism enables the support plate to rotate along with the skirt panel crossbeam, and the support plate can be flipped and adjusted between a horizontal working state and a downward standby state.

[0010] In some embodiments, in the standby state, the support plate is arranged at an angle of 30° to 90° with the horizontal plane.

[0011] In some embodiments, both ends of the skirt beam are rotatably mounted on the frame of the descaling machine; the skirt flipping mechanism includes a telescopic cylinder and a connecting plate, the cylinder seat of the telescopic cylinder is rotatably mounted on the frame of the descaling machine, the cylinder rod of the telescopic cylinder is rotatably connected to one end of the connecting plate, and the other end of the connecting plate is fixedly connected to the skirt beam.

[0012] A descaling machine for improving the shape and surface quality of hot-rolled strip steel is provided, wherein the skirt plate device as described above is installed between conveying rollers.

[0013] A method for improving the shape and surface quality of hot-rolled strip steel, applied to a descaling machine having the above-mentioned skirt plate device, the method comprising: when the strip steel runs into the descaling machine area, before the process rollers immediately behind the descaling machine area complete biting the steel, the top side of the support plate of the skirt plate device is parallel to the horizontal plane of the descaling machine roller; after the strip steel has run through the descaling machine area and the process rollers immediately behind the descaling machine area complete biting the steel, the skirt plate device is flipped downward so that the angle between the top side of the support plate of the skirt plate device and the horizontal plane of the descaling machine roller is set to be an acute angle.

[0014] In some embodiments, the hot rolling mill where the descaling machine is located adopts a single billet rolling mode or an endless rolling mode.

[0015] The beneficial effects of the present application are as follows: a skirt plate device for improving the shape and surface quality of hot-rolled strip steel is provided, which is arranged between the conveying rollers in the descaling machine, including a skirt plate beam and an even number of support plates, and the support plates are spaced and distributed parallel to each other; the cross-sectional shape of the support plate is defined, and the cross-sectional shape is perpendicular to the length direction of the support plate, and the support plate is extended along the width direction of the skirt plate beam, so that the length direction of the support plate is parallel to the width direction of the skirt plate beam, and the support plate has a cross-sectional shape perpendicular to the length direction, and the cross-sectional shape is defined, including a bottom side, a top side and left and right sides, the width of the bottom side is greater than the width of the top side, the left and right sides are inclined, and the top side is a circular arc transition, such as a trapezoid or a triangle, and its beneficial effect is that the scales removed by the descaling machine are easy to fall off and not easy to remain on the support plate, effectively It avoids scratches on the lower surface of the strip and the intrusion of iron oxide scale, and improves the surface quality of the strip; there is a target line along the width direction in the skirt beam, and an even number of support plates are symmetrically arranged on the left and right of the target line. When the skirt device is installed on the descaling machine, the target line coincides with the longitudinal center line of the descaling machine. It can be seen that the skirt beam is perpendicular to the longitudinal axis of the descaling machine, and the support plates are symmetrically distributed on both sides of the longitudinal center line of the descaling machine as a whole, and the support plates avoid the position of the longitudinal center line of the descaling machine. Its beneficial effect is that, in response to the phenomenon that the temperature of the middle part of the strip is low after passing through the descaling machine, no support plate is set in the middle position, and the support plate is designed to be narrow at the top and wide at the bottom, so as to avoid the back spray of water from the support plate to further reduce the temperature of the middle area of ​​the slab, so that the transverse temperature of the strip after passing through the descaling machine tends to be balanced, effectively improving the plate shape. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention.

[0017] Figure 1 A front view of a skirt plate device for improving the shape and surface quality of hot-rolled strip provided by the present application;

[0018] Figure 2 A top view of a skirt plate device for improving the shape and surface quality of hot-rolled strip provided in this application;

[0019] Figure 3 A schematic diagram of a skirt plate device for improving the shape and surface quality of hot-rolled strip provided in the present application, which is provided with a skirt plate turning mechanism and is obtained from a side view;

[0020] Figure 4 A schematic diagram of a skirt plate device for improving the shape and surface quality of hot-rolled strip provided in the present application in a standby state;

[0021] Figure 5A schematic cross-sectional view of a support plate in a skirt plate device for improving the shape and surface quality of hot-rolled strip provided in the present application.

[0022] The accompanying drawings are marked with: 100-skirt plate crossbeam, 110-target line, 200-support plate, 300-skirt plate turning mechanism, 310-telescopic cylinder, 320-connecting plate. DETAILED DESCRIPTION

[0023] Example 1

[0024] Disclosed is a skirt device for improving the shape and surface quality of hot rolled strip steel, please refer to Figure 1 、 Figure 2 ,and Figure 3 , showing the front view, top view and side view of the skirt device respectively.

[0025] The skirt assembly includes a skirt beam 100 and an even number of support plates 200. Figure 2 The even-numbered pallets 200 are all fixedly connected to the skirt beam 100. Specifically, one end of the pallet 200 is fixedly connected to the body of the skirt beam 100. The fixing method includes welding or screwing. The pallets 200 are arranged along the width direction of the skirt beam 100, so that the length direction of the pallet 200 is in the same direction as the width direction of the skirt beam 100. All pallets 200 are parallel to each other, and the even-numbered pallets 200 are arranged in sequence.

[0026] The above description describes the length direction of the skirt beam 100. The skirt beam 100 also has a height direction and a width direction perpendicular to both the height direction and the length direction. Figure 2 In this skirt panel device, the skirt panel crossbeam 100 is defined as having a target line 110. This target line 110 is arranged along the width direction of the skirt panel crossbeam 100, and the direction of the target line 110 is the same as the width direction of the skirt panel crossbeam 100. All the support plates 200 are arranged symmetrically about the target line 110. Since the number of support plates 200 is also defined as an even number, such as 2 or 4, it can be determined that no support plate 200 is provided at the position of the target line 110.

[0027] In order to solve the technical problem, the cross-section of the pallet 200 is limited. The cross-section is perpendicular to the length direction of the pallet 200. The cross-section includes a bottom side, a top side, and left and right sides. The width of the bottom side is greater than the width of the top side. The left and right sides are inclined, forming the characteristics of being narrow at the top and wide at the bottom, and the top side is an arc transition, including a smooth transition at the connection between the top side and the left side, and the connection between the top side and the right side.

[0028] The skirt device is arranged between the conveyor rollers in the descaling machine. To successfully solve the technical problem, during installation, it is necessary to ensure that when the pallet 200 is in a horizontal working state, the target line 110 coincides with the longitudinal centerline of the descaling machine. Therefore, when the pallet 200 is in a horizontal working state, the skirt beam 100 is perpendicular to the longitudinal axis of the descaling machine, and the pallet 200 is symmetrically distributed on both sides of the longitudinal centerline of the descaling machine as a whole, and the pallet 200 avoids the position of the longitudinal centerline of the descaling machine. The beneficial effect is that, in order to address the phenomenon of lower temperature in the middle of the strip after passing through the descaling machine, the pallet 200 is not installed in the middle position, and the pallet 200 is designed to be narrow at the top and wide at the bottom. This prevents the backspray of water from the pallet 200 from further reducing the temperature of the central area of ​​the slab, so that the transverse temperature of the strip after passing through the descaling machine tends to be balanced, effectively improving the plate shape.

[0029] In order to solve the problem that the removed iron oxide flakes accumulate on the skirt plate, causing scratches on the intermediate billet and iron oxide pressing in, which affects the surface quality of the strip, the present skirt plate device is installed between the conveyor rollers in the descaling machine. The support plate 200 adopts a special shape design with a narrow top and a wide bottom. The scales slide down from the left and right sides of the support plate 200, and the top side of the support plate 200 adopts an arc transition design, so that the iron oxide flakes removed by the descaling machine are easy to fall off and not easy to remain on the support plate 200, which effectively avoids scratches on the lower surface of the strip and the pressing in of iron oxide scale, and improves the surface quality of the strip.

[0030] The cross section of the support plate 200 is defined above. In some embodiments, please refer to Figure 1 and Figure 5 The cross section of the support plate 200 is a triangle that is narrow at the top and wide at the bottom, and the upper end of the triangle is a circular arc transition. In some embodiments, the cross section of the support plate 200 is a trapezoid that is narrow at the top and wide at the bottom, and the upper end of the trapezoid is a circular arc transition. In some embodiments, the cross section of the support plate 200 can also be a semicircular, semi-elliptical, or other shape.

[0031] In some embodiments, see Figure 2 An even number of support plates 200 are arranged on the same side of the skirt beam 100, and one end of each support plate 200 is fixedly connected to the skirt beam 100. When this arrangement is between the conveying rollers in the descaling machine, the skirt beam 100 can be close to the conveying rollers, and the support plates 200 have a sufficiently large length.

[0032] Example 2

[0033] The skirt device for improving the shape and surface quality of hot-rolled strip steel in Example 1 further includes a skirt turning mechanism 300. The skirt turning mechanism 300 can be referred to Figure 3 and Figure 4The skirt plate flipping mechanism 300 is connected to the skirt plate cross beam 100. The skirt plate flipping mechanism 300 causes the support plate 200 to rotate along with the skirt plate cross beam 100, so that the support plate 200 can be flipped and adjusted between a horizontal working state and a downward standby state. The downward standby state refers to the support plate 200 flipping and moving downward from between the conveying rollers in the descaling machine.

[0034] When in the standby state, the support plate 200 does not contact the strip on the conveyor rollers within the descaling machine. This means that the skirt plate device in the standby state no longer supports the strip. After the strip's head passes through the descaling machine and the strip has completed its bite, the skirt plate device is adjusted to the standby state. This effectively prevents the accumulation of oxide scale on the skirt plate and the backsplash of descaling water.

[0035] Figure 3 It is shown that, in the operating state, the support plate 200 is arranged along a horizontal plane. Figure 4 In some embodiments, under the action of the skirt flip mechanism 300, the angle between the support plate 200 and the horizontal plane in the standby state is limited to any value between 30° and 90°.

[0036] The two ends of the skirt beam 100 are rotatably mounted on the frame of the descaling machine. Regarding the specific structure of the skirt turning mechanism 300, in some embodiments, please refer to Figure 3 and Figure 4 The skirt flipping mechanism 300 includes a telescopic cylinder 310 and a connecting plate 320. The telescopic cylinder 310 includes a cylinder seat and a cylinder rod. The cylinder seat of the telescopic cylinder 310 is rotatably mounted on the frame of the descaling machine. The cylinder rod of the telescopic cylinder 310 is rotatably connected to one end of the connecting plate 320, and the other end of the connecting plate 320 is fixedly connected to the skirt beam 100.

[0037] For example, the skirt device is Figure 3 Status shown to Figure 4 During the state shown, the cylinder rod of the telescopic cylinder 310 is extended, pushing the connecting plate 320 to rotate. At this time, the cylinder base also rotates relative to the frame, and the connecting plate 320 drives the skirt beam 100 to rotate, and the support plate 200 rotates with the skirt beam 100. Figure 3 Move the horizontal position to Figure 4 Standby state shown.

[0038] Regarding the possible implementation methods of the skirt panel turning mechanism 300 , a motor may be used to directly drive the skirt panel crossbeam 100 to rotate, and so on.

[0039] Example 3

[0040] Disclosed is a descaling machine for improving the shape and surface quality of hot-rolled strip steel. A skirt plate device such as the above embodiments 1 and 2 is installed between conveyor rollers and is applied to hot rolling of the strip steel. During the descaling process, scratches on the lower surface of the strip steel and the intrusion of iron oxide scale are effectively avoided, the surface quality of the strip steel is improved, the transverse temperature of the strip steel after passing through the descaling machine tends to be balanced, and the plate shape is effectively improved.

[0041] Example 4

[0042] Disclosed is a method for improving the shape and surface quality of hot-rolled strip steel, which is applied to a descaling machine having the skirt plate device in the above embodiment 2.

[0043] The method includes: when the strip steel runs to the descaling machine area, before the process rollers immediately behind the descaling machine area complete biting the steel, the top side of the support plate 200 of the skirt device is parallel to the horizontal plane of the descaling machine roller.

[0044] The method includes: when the strip steel has passed through the descaling machine area and the process roller immediately behind the descaling machine area has completed biting the steel, the skirt device is flipped downward so that the angle between the top side of the support plate 200 of the skirt device and the horizontal plane of the descaling machine roller is at a position of 30° to 90°.

[0045] As described above, the hot rolling mill where the descaling machine is located can adopt a single billet rolling mode or an endless rolling mode for production.

[0046] The process rolls immediately after the descaler are referred to as the strip holding rolls located after the descaler on the strip's trajectory. For example, they may be the rolls of the mill stand immediately after the descaler, or the pinch rolls immediately after the descaler.

[0047] Corresponding to the above method, when a descaling machine with the skirt device in Example 1 is used, without setting a skirt flipping mechanism, the strip runs to the descaling machine area, before and after the process rollers adjacent to the descaling machine area complete biting the steel, the upper surface of the support plate of the skirt device is parallel to the horizontal plane of the descaling machine roller.

[0048] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0049] Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such changes and modifications fall within the scope of the claims and their equivalents, the present invention is intended to include such changes and modifications.

Claims

1. A skirt device for improving the shape and surface quality of hot-rolled strip steel, characterized in that: The skirt device includes a skirt beam and an even number of supporting plates fixedly connected to the skirt beam, the length direction of the supporting plate is the same as the width direction of the skirt beam, the skirt beam has a target line along the width direction, the even number of supporting plates are symmetrically arranged on the left and right of the target line, the cross section of the supporting plate is perpendicular to the length direction of the supporting plate, the cross section of the supporting plate includes a bottom side, a top side and left and right sides, the width of the bottom side is greater than the width of the top side, the left and right sides are inclined, and the top side is a circular arc transition; The skirt device is used to be installed between the conveying rollers in the descaling machine. When the supporting plate is in a horizontal working state, the target line coincides with the longitudinal center line of the descaling machine.

2. The skirt device according to claim 1, characterized in that The cross section of the support plate is a trapezoid or a triangle that is narrow at the top and wide at the bottom, and the upper end of the trapezoid or the triangle is an arc transition.

3. The skirt device according to claim 1, characterized in that An even number of the supporting plates are arranged on the same side of the skirt board cross beam, and one end of each supporting plate is fixedly connected to the skirt board cross beam.

4. The skirt device according to any one of claims 1 to 3, characterized in that: The skirt board device also includes a skirt board flipping mechanism, which is connected to the skirt board crossbeam. The skirt board flipping mechanism enables the support plate to rotate along with the skirt board crossbeam, and the support plate can be flipped and adjusted between a horizontal working state and a downward standby state.

5. The skirt device according to claim 4, characterized in that In the standby state, the support plate is arranged at an angle of 30° to 90° with the horizontal plane.

6. The skirt device according to claim 4, characterized in that Both ends of the skirt beam are rotatably mounted on the frame of the descaling machine; The skirt board flipping mechanism includes a telescopic cylinder and a connecting plate. The cylinder seat of the telescopic cylinder is rotatably mounted on the frame of the descaling machine. The cylinder rod of the telescopic cylinder is rotatably connected to one end of the connecting plate, and the other end of the connecting plate is fixedly connected to the skirt board crossbeam.

7. A descaling machine for improving the shape and surface quality of hot-rolled strip steel, characterized in that: The skirt device according to any one of claims 1 to 6 is installed between the conveying rollers.

8. A method for improving the shape and surface quality of hot-rolled strip steel, characterized in that: Applied to a descaling machine having the skirt device according to any one of claims 4 to 6, the method comprises: When the strip steel runs to the descaling machine area, before the process rollers immediately after the descaling machine area complete biting the steel, the top side of the support plate of the skirt plate device is parallel to the horizontal plane of the descaling machine roller table; After the strip steel has passed through the descaling machine area and the process rollers immediately behind the descaling machine area have completed biting the steel, the skirt device is flipped downward so that the angle between the top side of the support plate of the skirt device and the horizontal plane of the descaling machine roller is set at an acute angle.

9. The method according to claim 8, wherein The hot rolling mill where the descaling machine is located adopts a single billet rolling mode or an endless rolling mode for production.

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