A strip steel insulation device and hot rolling production line

Abstract

The utility model discloses a strip steel insulation device and a hot rolling production line, which are applied between a rolling mill and a coiler of the hot rolling production line. The strip steel insulation device comprises an insulation component, which comprises a frame structure and a ceramic fiber machine-made plate. The frame structure comprises a bottom steel plate and a connecting rod fixedly connected to the bottom steel plate, the connecting rod is used to be connected to a laminar cooling upper header of the hot rolling production line, the laminar cooling upper header can be flipped in a vertical direction to drive the frame structure to switch between a working position and a standby position, the ceramic fiber machine-made plate is fixedly mounted on the bottom side of the bottom steel plate, when in the working position, the ceramic fiber machine-made plate is located between the laminar cooling upper header and the strip steel, which can minimize the temperature drop of the strip steel temperature from the finishing rolling outlet to the coiler inlet, so that the hot rolling production line can handle the production of most high-temperature steel grades, ensure that the coiling temperature meets the coiling requirements of special high-temperature steel grades, the steel coil will not produce obvious flat coils, and the unloading of the coils can be completed smoothly.

Description

Technical Field

[0001] The utility model relates to the technical field of hot rolling, in particular to a strip steel insulation device and a hot rolling production line. Background Art

[0002] The laminar cooling upper header of conventional hot rolling production lines and continuous casting and rolling production lines can only achieve the function of strip cooling, and does not have the function of heat preservation. At present, the special high-temperature steel grades such as 22MnB5 require the coiling temperature to reach above 680 degrees, while the mill outlet temperature can only reach 840 degrees. Even if the laminar flow does not open the cooling water, it is difficult to reach the coiling temperature requirement of 680 degrees after long-distance air cooling. If the high coiling temperature requirement of special steel grades is not met, the coiled steel coil will produce flat coils and cannot be unloaded normally.

[0003] If the above problem is solved by adding a heating device, such as an induction heater or a heating furnace, there are defects such as large investment, complex structure and difficulty in implementation. Utility Model Content

[0004] In order to solve the above problems, the present application provides a strip steel insulation device and a hot rolling production line.

[0005] The present application provides a strip insulation device, which is applied between a rolling mill and a coiler of a hot rolling production line. The strip insulation device includes an insulation component, which includes a frame structure and a ceramic fiber machine-made plate. The frame structure includes a bottom steel plate and a connecting rod fixedly connected to the bottom steel plate, and the connecting rod is used to connect to a laminar cooling upper header of the hot rolling production line. The laminar cooling upper header can be flipped in a vertical direction to drive the frame structure to switch between a working position and a standby position. The ceramic fiber machine-made plate is fixedly installed on the bottom side of the bottom steel plate, wherein, when the laminar cooling upper header rotates to the working position, the ceramic fiber machine-made plate is located between the laminar cooling upper header and the strip.

[0006] In some embodiments, the bottom side of the ceramic fiber machine-made plate is a heating surface, the heating surface is a curved surface, and the heating surface is concave.

[0007] In some embodiments, the height difference between the edge and the middle of the heating surface is 10 mm.

[0008] In some embodiments, the dimension of the bottom steel plate along the width direction of the steel strip is greater than the spacing dimension of the guard plates on both sides of the conveying roller table of the hot rolling production line.

[0009] In some embodiments, the dimension of the bottom steel plate along the length direction of the steel strip is smaller than the length of a single set of laminar cooling upper headers.

[0010] In some embodiments, the bottom side of the ceramic fiber machined board is provided with a far infrared radiation coating.

[0011] In some embodiments, the bottom steel plate is a stainless steel plate with a thickness of 2 mm.

[0012] In some embodiments, the bottom steel plate and the ceramic fiber machined plate are fastened together by bolts.

[0013] In some embodiments, a plurality of insulation components are provided, and the plurality of insulation components are sequentially spaced apart along the running direction of the steel strip, and each insulation component is respectively connected to a single group of laminar cooling upper headers.

[0014] A hot rolling production line comprises a rolling mill, a coiler, a plurality of groups of laminar cooling upper headers and the above-mentioned strip steel insulation device, wherein the plurality of groups of laminar cooling upper headers are used to cool the strip steel, and the plurality of groups of laminar cooling upper headers are sequentially spaced apart along the running direction of the strip steel, the strip steel insulation device is located between the rolling mill and the coiler, and a connecting rod is connected to the laminar cooling upper header.

[0015] The beneficial effects of the present application are as follows: a strip steel insulation device is provided, comprising at least one insulation component, the insulation component comprising a frame structure and a ceramic fiber machine-made plate, the frame structure comprising a bottom steel plate and a connecting rod, the connecting rod being fixedly connected to the bottom steel plate, the device is applied in a laminar cooling section, the connecting rod being connected to a laminar cooling upper header of a hot rolling production line, the laminar cooling upper header itself being rotatable to switch between a working position and a standby position, the frame structure being rotatable along with the laminar cooling upper header of the hot rolling production line through the connection between the connecting rod and the laminar cooling upper header assembly, the ceramic fiber machine-made plate being fixedly mounted on the bottom side of the bottom steel plate; during the production process When the laminar cooling upper header rotates to the working position, the laminar cooling upper header is generally in a horizontal state at this time. At this time, the connecting rods are distributed vertically, and the steel plate is close to the conveyor roller of the hot rolling production line. The conveyor roller of the hot rolling production line is used to convey the strip steel, and the ceramic fiber machine-made plate is located between the laminar cooling upper header and the strip steel. Through the heat insulation and heat preservation properties of the ceramic fiber machine-made plate, the temperature drop of the strip steel from the finishing outlet to the coiler inlet can be minimized to the greatest extent, so that the hot rolling production line can handle the production of most high-temperature steel grades, and ensure that the coiling temperature can meet the coiling requirements of special high-temperature steel grades. The steel coil will not produce obvious flat coils, and the unloading of the coils is completed smoothly. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0017] Figure 1 A schematic diagram of the installation of a strip steel insulation device provided in this application;

[0018] Figure 2 A plan view of a strip steel insulation device provided for this application;

[0019] Figure 3 A side view of a strip steel insulation device provided in the present application;

[0020] Figure 4 A front view of a strip steel insulation device provided in the present application;

[0021] Figure 5 for Figure 4 Schematic diagram of the height difference h between the edge and the middle of the heated surface of the ceramic fiber machine-made plate.

[0022] Figure markings: 100-frame structure, 110-bottom steel plate, m-bottom steel plate width, n-bottom steel plate length, 120-connecting rod, 200-ceramic fiber machined plate, h-height difference, 300-bolt, 310-gasket, 20-edge shielding device of laminar cooling upper header. DETAILED DESCRIPTION

[0023] In conventional hot rolling production lines and continuous casting and rolling production lines, the laminar cooling upper header can only achieve the function of strip cooling, and does not have the function of heat preservation. At present, special high-temperature steel grades such as 22MnB5 require the coiling temperature to reach above 680 degrees, while the mill outlet temperature can only reach 840 degrees. Even if the laminar flow does not open cooling water, it is difficult to reach the coiling temperature requirement of 680 degrees after long-distance air cooling. If the high coiling temperature requirement of special steel grades is not met, the coiled steel coil will produce flat coils and cannot be unloaded normally.

[0024] If the above problem is solved by adding a heating device, such as an induction heater or a heating furnace, there are defects such as large investment, complex structure and difficulty in implementation.

[0025] Based on the above viewpoints, the inventor provides a strip heat preservation device, which selects the inventive idea of ​​heat preservation of the laminar flow area under the premise that the mill outlet temperature is high enough, and can also meet the coiling temperature requirements. The strip heat preservation device of the present application is easy to implement and can be directly modified on the existing hot rolling production line, and has the advantage of low cost.

[0026] Specifically, the strip steel insulation device is used between the rolling mill and the coiler of the hot rolling production line to insulate the strip steel from the finishing rolling outlet to the coiler entrance. The strip steel insulation device includes an insulation component, which includes a frame structure and a ceramic fiber machine-made plate. Please refer to Figures 2 to 4 The frame structure 100 includes a bottom steel plate 110 and a connecting rod 120. The connecting rod 120 is fixedly connected to the bottom steel plate 110. The connecting rod 120 is also connected to the laminar cooling upper header of the hot rolling production line, so that the device can rotate together with the laminar cooling upper header.

[0027] In the hot rolling production line, the laminar cooling upper header can be flipped in the vertical direction to drive the frame structure to switch between the working position and the standby position. When in the working position, the laminar cooling upper header is generally in a horizontal state, and when in the standby position, the laminar cooling upper header is away from the conveyor roller of the hot rolling production line. When the device is switched to the standby position, the device no longer blocks the space above the strip, cancels the insulation effect on the strip, and also facilitates the maintenance of the production line between the rolling mill and the coiler, providing maintenance operation space.

[0028] When the laminar cooling upper header is in the working position, the strip insulation device appears as follows Figure 1 , Figure 3 and Figure 4 In the orientation shown, the ceramic fiber machine plate is located between the laminar cooling upper header and the strip steel. The ceramic fiber machine plate 200 can withstand a maximum operating temperature of 1250 degrees and a continuous operating temperature of 920 degrees to 1150 degrees, meeting the temperature requirements of the laminar strip steel. The ceramic fiber machine plate 200 has a heat insulation effect, which can minimize the temperature drop of the strip steel from the finishing outlet to the coiler inlet, so that the hot rolling production line can handle the production of most high coiling temperature steel grades, ensure that the coiling temperature can meet the coiling requirements of special high-temperature steel grades, and the steel coil will not produce obvious flat coils, and the unloading of the coils is completed smoothly.

[0029] For example, when hot rolling special high-temperature steel grade 22MnB5 to produce strip steel, the mill outlet temperature reaches 840 degrees. The strip steel insulation device of the present application is applied, and all laminar cooling upper headers are not subjected to laminar cooling. The coil temperature can reach 680 degrees when the coiler is coiling, meeting the high coiling temperature requirement of special steel grades, improving the flat coil defect of the steel coil, and successfully completing the coil unloading.

[0030] The connection rod 120 is connected to the laminar cooling upper header of the hot rolling production line. The laminar cooling upper header belongs to the structure of the laminar flow area of ​​the hot rolling production line. The laminar cooling upper header includes structures such as pipelines and edge shielding devices. In some embodiments, please refer to Figure 1 The connecting rod 120 is welded to the edge shielding device 20 of the laminar cooling upper header. In some embodiments, the heat preservation device can also be installed in a detachable manner.

[0031] In some embodiments, a plurality of insulation components are provided, and the strip insulation device includes a plurality of insulation components, and the plurality of insulation components are arranged in sequence and at intervals along the running direction of the strip, and each insulation component is respectively connected to a single group of laminar cooling upper headers. The laminar area of ​​the hot rolling production line includes a plurality of groups of laminar cooling upper headers, and the insulation components of the present application are installed in several groups of laminar cooling upper headers, while the insulation components of the present application are not installed in other groups of laminar cooling upper headers, so as to ensure that the coiling temperature can meet the coiling requirements of special high-temperature steel grades. When the production line is for steel grades other than special high-temperature steel grades and needs to be cooled, the laminar cooling upper header with the insulation component installed is switched to the standby position, and no insulation is performed, and the other laminar cooling upper headers without the insulation component installed are sprayed with water normally, and laminar cooling is performed smoothly.

[0032] It should be pointed out that when providing the heat preservation function, the closer the ceramic fiber machine plate 200 is to the steel strip, the better the heat preservation effect. The steel strip is located on the conveyor roller of the hot rolling production line, and the side guard plates of the conveyor roller of the hot rolling production line are higher than the conveyor roller of the hot rolling production line. Therefore, when the laminar cooling upper header is switched to the working position, the ceramic fiber machine plate 200 is closer to the side guard plates of the conveyor roller of the hot rolling production line.

[0033] In some embodiments, the bottom side of the ceramic fiber machine-made plate 200 is coated with a far-infrared radiation coating, for example, the infrared coating LYHT-1 is used to form a far-infrared radiation coating on the bottom side of the ceramic fiber machine-made plate 200. The far-infrared radiation coating reflects heat radiation to the greatest extent, thereby improving the thermal insulation effect of the strip.

[0034] For the connection between the bottom steel plate 110 and the ceramic fiber machine plate 200, please refer to Figure 2 In some embodiments, the bottom steel plate 110 and the ceramic fiber machine plate 200 are joined by bolts 300. Specifically, the gasket 310 is sleeved on the bolts 300, and the bolts 300 are locked with nuts so that the bottom steel plate 110, the ceramic fiber machine plate 200, and the gasket 310 are tightly attached to each other.

[0035] The bottom side of the ceramic fiber machine-made board 200 is a heating surface. In some embodiments, please refer to Figure 4 and Figure 5 ,in Figure 5 The height difference h between the edge and the middle of the heating surface is clearly displayed. The heating surface is an arc surface, the heating surface is concave, and there is a height difference h between the edge and the middle of the heating surface. This solution fully considers the thermal deformation and bending of the device, so that the device is straight after heating, reducing heat loss. In some embodiments, the height difference h between the edge and the middle of the heating surface is 10mm, and the width of the heating surface is close to 2440mm.

[0036] The width of the heat preservation device specifically refers to the size of the bottom steel plate along the width direction of the steel strip, which can also be understood as the width of the bottom steel plate. In some embodiments, the width m of the bottom steel plate is greater than the spacing of the guard plates on both sides of the conveyor roller of the hot rolling production line. In order to ensure the heat preservation effect as much as possible, the covering width of the heat preservation cover is greater than the spacing width of the guard plates on both sides. For example, when the spacing width of the guard plates on both sides of the roller is 1920mm, the covering width of the heat preservation cover is 2440mm, that is, the width of the bottom steel plate is 2440mm.

[0037] The length of the heat preservation device specifically refers to the size of the bottom steel plate along the length direction of the steel strip. The size of the bottom steel plate along the length direction of the steel strip can also be understood as the length of the bottom steel plate. In some embodiments, the length n of the bottom steel plate is limited to be less than the length of a single set of laminar cooling upper headers. In detail, the heat preservation device is designed according to the length of each set of laminar cooling upper headers, and each set of laminar cooling upper headers corresponds to an heat preservation component. Here, an example is given as follows. Under the condition that the length of each set of laminar cooling upper headers is 4640 mm, considering the interference problem at the joint, the length n of the bottom steel plate is set to 4620 mm.

[0038] Regarding the height of the insulation device, since the connecting rod 120 is welded to the edge shielding device of the laminar cooling upper header, when the laminar cooling upper header is flipped to a horizontal position, the laminar cooling upper header is switched to the working position accordingly. In order to ensure the insulation effect as much as possible, the ceramic fiber machine-made plate 200 is as close as possible to the two side guard plates of the conveyor roller of the hot rolling production line.

[0039] In some embodiments, the bottom steel plate 110 is a thin stainless steel plate, which reduces the generation of rust and the probability of foreign matter being pressed in due to rust, thereby ensuring the quality of the product. Specifically, a 2 mm thick stainless steel plate can be selected, which also has a lightweight effect, reduces the weight of the structural parts, thereby reducing the load of the laminar flow flipping device and ensuring the stability of the movement. At the same time, the selection of 2 mm thick stainless steel material ensures that there is sufficient welding support strength, and the connecting rod 120 and the steel plate can be connected by welding.

[0040] In some embodiments, the connecting rod 120 is a 30 square tube with a wall thickness of 2 mm and a weight of only 1.67 kg per meter, which is about one-fifth of the weight of a channel steel or I-beam of the same length, thereby reducing the overall weight to the greatest extent and ensuring the stability of the device operation.

[0041] The present application also provides a hot rolling production line, including a rolling mill, a coiler, multiple groups of laminar cooling upper headers and the above-mentioned strip insulation device. The multiple groups of laminar cooling upper headers in the hot rolling production line are used to cool the strip. The multiple groups of laminar cooling upper headers are distributed in sequence along the running direction of the strip. The strip insulation device is located between the rolling mill and the coiler, and is connected to the laminar cooling upper header by a connecting rod, so that the strip insulation device can rotate with the laminar cooling upper header.

[0042] The hot rolling production line provided in the present application can minimize the temperature drop of the strip from the finishing rolling outlet to the coiler inlet to the greatest extent, so that the hot rolling production line can handle the production of most high-temperature steel grades, ensure that the coiling temperature can meet the coiling requirements of special high-temperature steel grades, and the steel coil will not produce obvious flat coils, and the coil unloading is completed smoothly.

[0043] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other 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 falling within the scope of the present invention.

[0044] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A strip steel insulation device, characterized in that: Applied between a rolling mill and a coiler of a hot rolling production line, the strip steel insulation device comprises an insulation component, and the insulation component comprises: The frame structure comprises a bottom steel plate and a connecting rod fixedly connected to the bottom steel plate, wherein the connecting rod is used to be connected to the laminar cooling upper header of the hot rolling production line, and the laminar cooling upper header can be turned over in the vertical direction to drive the frame structure to switch between the working position and the standby position; A ceramic fiber machine-made plate, fixedly mounted on the bottom side of the bottom steel plate; Wherein, when the laminar cooling upper header rotates to the working position, the ceramic fiber machine-made plate is located between the laminar cooling upper header and the steel strip to keep the steel strip warm.

2. The strip steel insulation device according to claim 1, characterized in that: The bottom side of the ceramic fiber machine-made plate is a heating surface, the heating surface is a curved surface, and the heating surface is concavely arranged.

3. The strip steel insulation device according to claim 2, characterized in that: The height difference between the edge and the middle of the heating surface is 10 mm.

4. The strip steel insulation device according to claim 1, characterized in that: The dimension of the bottom steel plate along the width direction of the steel strip is greater than the spacing dimension of the guard plates on both sides of the conveying roller of the hot rolling production line.

5. The strip steel insulation device according to claim 1, characterized in that: The dimension of the bottom steel plate along the length direction of the steel strip is smaller than the length of a single set of the laminar cooling upper headers.

6. The strip steel insulation device according to claim 1, characterized in that: The bottom side of the ceramic fiber machine-made board is provided with a far-infrared radiation coating.

7. The strip steel insulation device according to claim 1, characterized in that: The bottom steel plate is a stainless steel plate with a thickness of 2 mm.

8. The strip steel insulation device according to claim 1, characterized in that: The bottom steel plate and the ceramic fiber machine-made plate are fastened together by bolts.

9. The strip steel insulation device according to claim 1, characterized in that: There are multiple insulation components, which are arranged in sequence and spaced apart along the running direction of the steel strip, and each insulation component is respectively connected to a single group of laminar cooling upper headers.

10. A hot rolling production line, characterized in that: include: Rolling mill; Coiler; A plurality of groups of laminar cooling upper headers, used for cooling the steel strip, are sequentially spaced apart along the running direction of the steel strip; The strip insulation device as described in any one of claims 1 to 9 is located between the rolling mill and the coiler, and the connecting rod is connected to the laminar cooling upper header.

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