Aerosol cooling device at outlet of hot rolling ultrathin strip rolling mill

Abstract

The invention discloses an aerial fog cooling device at an outlet of a hot rolling ultrathin strip rolling mill, which comprises an aerial fog cooling header system arranged above strip steel, and the aerial fog cooling header system comprises a plurality of aerial fog cooling headers arranged at intervals along the length direction of the strip steel, and compressed air pipelines connected with the aerial fog cooling headers, the first valve is arranged on the compressed air pipeline; at least one aerial fog cooling header forms a group of aerial fog cooling units; the compressed air purging headers are arranged between every two adjacent aerial fog cooling units, and second valves are arranged on the compressed air purging headers; cooling aerial fog sprayed out of the aerial fog cooling collecting pipe forms cooling water on the strip steel; the cooling water is separated by compressed air sprayed out of the compressed air purging collecting pipe, and a plurality of independent cooling areas are formed on the strip steel. The problems that in a traditional cooling method, cooling fluid on the surface of the strip steel flows disorderly, and the cooling efficiency is difficult to control accurately can be solved.

Description

Technical Field

[0001] The invention relates to the technical field of hot-rolled ultra-thin strip casting cooling equipment, and in particular to an air mist cooling device at the outlet of a hot-rolled ultra-thin strip rolling mill. Background Art

[0002] In the production of traditional hot-rolled ultra-thin strips, the cooling process is one of the key factors affecting the performance of the final product. However, existing cooling equipment often has problems such as uneven cooling effect and inaccurate zoning control, which leads to large temperature gradients and significant differences in organizational properties during the cooling process of the strip, thus affecting key indicators such as strip shape, strength, and toughness.

[0003] Therefore, it is necessary to propose an air mist cooling device at the outlet of a hot rolling ultra-thin strip mill to solve at least one of the above problems. Summary of the invention

[0004] In view of the defects existing in the prior art, an embodiment of the present invention provides an aerosol cooling device at the outlet of a hot rolling ultra-thin strip mill, which can solve the problems of disordered flow of cooling fluid on the surface of the strip and difficulty in accurately controlling the cooling efficiency in traditional cooling methods.

[0005] The specific technical solution of the implementation mode of the present invention is:

[0006] A mist cooling device for an outlet of a hot-rolled ultra-thin strip mill, the mist cooling device for an outlet of a hot-rolled ultra-thin strip mill comprising: the mist cooling device for an outlet of a hot-rolled ultra-thin strip mill comprising: a mist cooling manifold system for being arranged above a strip, the mist cooling manifold system comprising a plurality of mist cooling manifolds arranged at intervals along the length direction of the strip, a compressed air pipeline connected to the mist cooling manifold, and a first valve arranged on the compressed air pipeline; at least one of the mist cooling manifolds forms a group of mist cooling units; a compressed air purge manifold, the compressed air purge manifold is arranged between two adjacent mist cooling units, and a second valve is arranged on the compressed air purge manifold; when the first valve is in an open state, the second valve is also in an open state, and the cooling mist sprayed from at least one of the mist cooling manifolds in the mist cooling unit forms cooling water on the strip; the compressed air sprayed from the compressed air purge manifold separates the cooling water to form a plurality of independent cooling areas on the strip.

[0007] In a preferred embodiment, the compressed air purge manifold is provided with a plurality of partition nozzles, and the plurality of partition nozzles are evenly spaced and arranged in a direction perpendicular to the length of the steel strip.

[0008] In a preferred embodiment, the directions in which the gas is ejected from the plurality of partition nozzles are inclined at a predetermined angle, which can drive the cooling water on the steel strip to be discharged in the width direction of the steel strip.

[0009] In a preferred embodiment, the predetermined angle is positively correlated with the running speed of the steel strip and the amount of cooling water formed by the gas mist cooling manifold on the surface of the steel strip.

[0010] In a preferred embodiment, the predetermined angle is between 0° and 15°.

[0011] In a preferred embodiment, the gas ejected from the plurality of partition nozzles is in the same direction, and the gas ejected from the partition nozzles discharges the cooling water toward the same side in the width direction of the steel strip.

[0012] In a preferred embodiment, the gas ejected from the plurality of partition nozzles is in different directions, and the gas ejected from some of the partition nozzles discharges the cooling water toward one side in the width direction of the strip, while the gas ejected from some of the partition nozzles discharges the cooling water toward the other side in the width direction of the strip.

[0013] In a preferred embodiment, the mist cooling device at the outlet of the hot rolling ultra-thin strip mill further comprises: a compressed air system, and the compressed air system is respectively connected to the compressed air pipeline and the compressed air purge manifold.

[0014] In a preferred embodiment, the opening and closing states of the first valve and the second valve are consistent.

[0015] In a preferred embodiment, the aerosol cooling unit includes a plurality of aerosol cooling manifolds, each of which includes a plurality of aerosol nozzles spaced apart along the width direction of the steel strip, and the aerosols sprayed from the aerosol nozzles of two adjacent aerosol cooling manifolds in the same aerosol cooling unit can intersect at least at the boundary.

[0016] In a preferred embodiment, two adjacent aerosol cooling headers in the same aerosol cooling unit are spaced apart by a first spacing, and in two adjacent aerosol cooling units, the two most adjacent aerosol cooling headers are spaced apart by a second spacing, and the first spacing is smaller than the second spacing.

[0017] The technical solution of the present invention has the following significant beneficial effects:

[0018] The mist cooling device at the outlet of the hot-rolled ultra-thin strip mill provided in the embodiment of the present application aims at a series of complex problems such as the irregular flow of the strip on the surface of the steel plate and the difficulty in accurately controlling the cooling effect during the current cooling process, which in turn has an adverse effect on the strip shape and causes a significant increase in the lateral performance difference of the strip. By arranging a compressed air purge manifold between the mist cooling manifolds, the cooling water formed on the strip by the cooling mist sprayed from the mist cooling manifold can be partitioned by the compressed air purge manifold to form multiple independent cooling areas, thereby ensuring the stability and controllability of the cooling process in an ingenious way and improving the quality of the strip product. That is, through the optimized design of the above-mentioned cooling system, the problems of irregular flow of cooling water and uncontrollable cooling during the current cooling process can be solved, and the quality and performance stability of the strip product can be significantly improved.

[0019] With reference to the following description and drawings, specific embodiments of the present invention are disclosed in detail, indicating the manner in which the principles of the present invention can be adopted. It should be understood that the embodiments of the present invention are not limited in scope. Within the spirit and scope of the appended claims, the embodiments of the present invention include many changes, modifications and equivalents. Features described and / or shown for one embodiment can be used in one or more other embodiments in the same or similar manner, combined with features in other embodiments, or replace features in other embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings described herein are only for explanation purposes and are not intended to limit the scope of the present invention in any way. In addition, the shapes and proportional dimensions of the various components in the figures are only schematic, used to help understand the present invention, and are not specifically limited to the shapes and proportional dimensions of the various components of the present invention. Those skilled in the art can select various possible shapes and proportional dimensions to implement the present invention according to the teachings of the present invention.

[0021] Figure 1 A front view of an air mist cooling device at the outlet of a hot-rolled ultra-thin strip mill provided in an embodiment of the present application;

[0022] Figure 2 A top view of a gas mist cooling device at the outlet of a hot-rolled ultra-thin strip mill provided in an embodiment of the present application;

[0023] Figure 3 It is a left view of a gas mist cooling device at the outlet of a hot-rolled ultra-thin strip mill provided in an embodiment of the present application;

[0024] Figure 4 This is a schematic diagram of the position of a cooling area formed on the surface of the strip by a mist cooling device at the outlet of a hot-rolled ultra-thin strip mill provided in an embodiment of the present application.

[0025] Reference numerals of the present application:

[0026] 1. Roller table;

[0027] 2. Strip steel;

[0028] 3. Aerosol cooling header;

[0029] 31. Aerosol nozzle;

[0030] 4. Use compressed air to purge the header;

[0031] 41. Partition nozzle;

[0032] 5. The first valve;

[0033] 6. Second valve;

[0034] 7. Cooling area;

[0035] X, length direction;

[0036] Y, width direction. DETAILED DESCRIPTION

[0037] The technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. After reading the present invention, various equivalent forms of modifications to the present invention by those skilled in the art all fall within the scope defined by the claims attached to this application.

[0038] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0040] Aerosol cooling technology is a technology that uses compressed air (or other high-pressure gases) and a special atomization structure design to atomize liquid into extremely small droplets, spray them onto the surface of high-temperature objects, and remove heat through the flow of gas or liquid. Its cooling capacity is between gas spray cooling and water spray (water quenching), and it has the advantages of a wide cooling speed adjustment range, high cooling uniformity, and high control accuracy.

[0041] At present, the gas mist cooling equipment for thin strip casting and rolling is that each set of gas mist cooling device is equipped with multiple headers with gas mist nozzles, and there is no partition device between the water vapor headers, and each header is controlled separately. The header partition is only controlled by the individual opening and closing of the header. After each header sprays cooling water, the cooling water flows freely on the surface of the strip.

[0042] The role of the gas mist cooling device in thin strip casting is relatively critical. This device plays a role in cooling the ultra-thin strip rolled steel, and at the same time plays a key role in the development of new steel grades, especially high-strength steel. However, due to the thickness / temperature / material characteristics of the cast and rolled strip steel, the strip steel is sensitive to the heat exchange of cooling water. After the cooling water is cooled by the first impact on the surface of the strip steel, a series of problems such as uneven cooling / uneven strip steel performance are caused due to the retention of cooling water.

[0043] The present invention provides an air mist cooling device at the outlet of a hot-rolled ultra-thin strip mill, which solves the problems of disordered flow of cooling fluid on the surface of the strip and difficulty in accurately controlling the cooling efficiency in the traditional cooling method. These problems often lead to poor strip shape and large lateral performance differences, which in turn affect the final quality of the product.

[0044] Please refer to Figures 1 to 4 In the embodiment of the specification of the present application, a mist cooling device for the outlet of a hot-rolled ultra-thin strip mill is provided, and the mist cooling device for the outlet of the hot-rolled ultra-thin strip mill may include: a mist cooling manifold system for being arranged above the strip 2, the mist cooling manifold system including a plurality of mist cooling manifolds 3 arranged at intervals along the length direction X of the strip 2, a compressed air pipeline connected to the mist cooling manifold 3, and a first valve 5 arranged on the compressed air pipeline; at least one of the mist cooling manifolds 3 forms a group of mist cooling units; a compressed air purge manifold 4, the compressed air purge manifold 4 is arranged between two adjacent mist cooling units, and a second valve 6 is arranged on the compressed air purge manifold 4; when the first valve 5 is in an open state, the second valve 6 is also in an open state, and the cooling mist sprayed from at least one of the mist cooling manifolds 3 in the mist cooling unit forms cooling water on the strip 2; the compressed air sprayed from the compressed air purge manifold 4 separates the cooling water to form a plurality of independent cooling areas 7 on the strip 2.

[0045] The mist cooling device at the outlet of the hot-rolled ultra-thin strip mill provided in the embodiment of the present application aims to solve a series of complex problems such as the irregular flow of the steel strip 2 driven by the roller 1 on the steel plate surface during the current cooling process, the difficulty in accurately controlling the cooling effect, which in turn has an adverse effect on the shape of the steel strip 2 and causes a significant increase in the lateral performance difference of the steel strip 2. By arranging a compressed air purge manifold 4 between the mist cooling manifolds 3, the compressed air purge manifold 4 can be used to partition the cooling water formed on the steel strip 2 by the cooling mist sprayed from the mist cooling manifold 3 to form a plurality of independent cooling areas 7, thereby ensuring the stability and controllability of the cooling process in an ingenious way and improving the quality of the steel strip 2 product.

[0046] That is, through the optimized design of the above cooling system, the problems of irregular cooling water flow and uncontrollable cooling in the current cooling process can be solved, and the quality and performance stability of strip steel 2 products can be significantly improved.

[0047] The present application will be described in detail below with reference to specific drawings and implementation methods.

[0048] In the embodiment of the present application, the mist cooling device at the outlet of the hot rolling ultra-thin strip mill may include: a mist cooling manifold system arranged above the strip steel 2 and a compressed air purge manifold 4, etc.

[0049] like Figure 1 As shown, the aerosol cooling manifold system is located directly above the steel strip 2 as the main execution component of the cooling process. The aerosol cooling manifold system is provided with a plurality of aerosol cooling manifolds 3 arranged at intervals along the length direction X of the steel strip 2. Each aerosol cooling manifold 3 is independently provided. Specifically, for the aerosol cooling manifold 3 located above the steel strip 2, in order to generate cooling water aerosol, each aerosol cooling manifold 3 is independently provided with a compressed air pipeline. The compressed air pipeline can be used to provide necessary pressure support when spraying aerosol.

[0050] A set of first valves 5 is installed on each compressed air pipeline, and the first valves 5 can be specifically electrically controlled switch valves. These electrically controlled switch valves are installed on each compressed air pipeline, and these fast-response electrically controlled switch valves are electrically connected to the central control system, so that they can be uniformly dispatched by the central control system. By accurately controlling the switch time and duration of each first valve 5, the aerosol cooling intensity of different areas can be flexibly adjusted, providing basic conditions for zoned cooling.

[0051] A group of compressed air purge headers 4 is arranged between each of two or more groups (adjusted according to the process grouping requirements) of aerosol cooling units formed by aerosol cooling headers 3 .

[0052] In the embodiment of the present application, the compressed air purge header 4 is used as a core component of the zoned cooling technology, and the compressed air purge header 4 is arranged between the aerosol cooling units formed by two or more groups of aerosol cooling headers 3 .

[0053] The compressed air purge manifold 4 is provided with a second valve 6, which can be a pneumatic valve and can be opened or closed individually. By equipping each group of compressed air purge manifolds 4 with a pneumatic valve, its working state can be independently controlled.

[0054] When the mist cooling manifold 3 starts working, the pneumatic valve of the corresponding compressed air purge manifold 4 will also be opened synchronously to release high-pressure compressed air to form air curtains, which accurately divide the steel plate surface of the strip steel 2 into multiple independent cooling areas 7. The position of the air curtain can be determined according to the partitions formed by the mist cooling manifold 3 on the surface of the strip steel 2, and each partition is separated by the air curtain formed by the mist cooling manifold 3.

[0055] Whenever the strip steel 2 is cooled by the mist cooling device at the outlet of the hot rolling ultra-thin strip mill, the pneumatic valve of the compressed air purge manifold 4 is opened, and compressed air is ejected to divide the surface of the strip steel 2 into a plurality of independent cooling areas 7, thereby achieving the effect of zoned cooling, and precisely controlling the flow of cooling water so that the cooling water in each cooling area 7 can be concentrated in the designated cooling area 7 to uniformly cool the strip steel 2 corresponding to the current cooling area 7, thereby solving the problem in the traditional cooling method that the cooling fluid on the surface of the strip steel 2 flows in disorder and the cooling efficiency is difficult to precisely control.

[0056] like Figure 2 As shown, in some embodiments, the compressed air purge manifold 4 is provided with a plurality of partition nozzles 41, and the plurality of partition nozzles 41 are evenly spaced apart in a direction X perpendicular to the length of the steel strip 2, so that a continuous air curtain partition zone can be formed on the surface of the steel strip 2. The air curtain partition zone formed by the compressed air purge manifold 4 can divide the steel plate surface of the steel strip 2 into a plurality of independent cooling areas 7, and concentrate the cooling water in a certain independent cooling area 7 for partition cooling, so as to accurately control the cooling efficiency and the effect of controlling the fluid flow on the surface of the steel strip 2.

[0057] In addition, the air curtain dividing zone can be used to guide the cooling water in the cooling area 7 so that the cooling water in the cooling area 7 is discharged from the surface of the steel strip 2 in the width direction Y of the steel strip 2 .

[0058] Please refer to Figure 3 and Figure 4 In one embodiment, the directions in which the gas is ejected from the plurality of partition nozzles 41 are inclined at a predetermined angle, which can drive the cooling water on the steel strip 2 to be discharged in the width direction Y of the steel strip 2 .

[0059] In this embodiment, the partition nozzles 41 of each compressed air purge header 4 are arranged at a predetermined angle to ensure that the cooling water flows out to both sides along the surface of the steel strip 2.

[0060] In this embodiment, in order to ensure that the cooling water can flow out uniformly and effectively to both sides along the surface of the steel strip 2, the direction of the partition nozzle 41 of each compressed air purge header 4 can be inclined at a certain angle. This angle arrangement makes full use of the principle of fluid dynamics, so that the ejected compressed air can form an ideal flow path, avoiding the local accumulation of cooling water on the surface of the steel strip 2 or excessive loss. At the same time, this design also helps to improve the coverage rate and cooling efficiency of cooling water, and ensure the uniformity of the surface temperature distribution of the steel strip 2.

[0061] The predetermined angle may be the angle between the flow direction of the gas ejected from the partition nozzle 41 and the vertical direction in the cross section perpendicular to the steel strip 2. Specifically, the predetermined angle may be between 0° and 15°. Since the main function of the gas ejected from the partition nozzle 41 of the compressed air purge header 4 is to form multiple independent cooling areas 7 on the surface of the steel strip 2, the predetermined angle should not be too large.

[0062] The predetermined angle is positively correlated with the running speed of the steel strip 2 and the amount of cooling water formed by the gas mist cooling manifold 3 on the surface of the steel strip 2. When the cooling water formed by the gas mist cooling manifold 3 on the surface of the steel strip 2 in a certain cooling area 7 is more, the predetermined angle can be set larger; when the cooling water formed by the gas mist cooling manifold 3 on the surface of the steel strip 2 in a certain cooling area 7 is less, the predetermined angle can be set smaller.

[0063] When the running speed of the steel strip 2 is relatively fast, more cooling water needs to be sprayed into each cooling area 7 of the steel strip 2 to achieve a better cooling purpose. At this time, the predetermined angle can be set to be larger. On the contrary, when the running speed of the steel strip 2 is relatively slow, less cooling water needs to be sprayed into each cooling area 7 of the steel strip 2 to achieve an appropriate cooling purpose. At this time, the predetermined angle can be set to be smaller.

[0064] In a specific embodiment, the gas ejected from the plurality of partition nozzles 41 is in the same direction, and the gas ejected from the partition nozzles 41 discharges the cooling water toward the same side in the width direction Y of the steel strip 2 .

[0065] Alternatively, in another specific embodiment, the directions in which the gases are ejected from the plurality of partition nozzles 41 are different, and the gases ejected from some of the partition nozzles 41 discharge the cooling water toward one side of the width direction Y of the steel strip 2 , while the gases ejected from some of the partition nozzles 41 discharge the cooling water toward the other side of the width direction Y of the steel strip 2 .

[0066] Of course, the direction in which the partition nozzle 41 sprays gas can also be other combinations and is not limited to the above description. Technical personnel in the relevant field may make other changes inspired by the technical essence of this application, but as long as the functions and effects achieved are the same or similar to those of this application, they should be covered within the scope of protection of this application.

[0067] In one embodiment, the mist cooling device at the outlet of the hot rolling ultra-thin strip mill further includes: a compressed air system, and the compressed air system is connected to the compressed air pipeline and the compressed air purge header 4 respectively.

[0068] The compressed air pipeline and the compressed air purge manifold 4 share a compressed air system. Such an arrangement can simplify the system structure, reduce maintenance costs and improve the convenience of operation.

[0069] Specifically, the compressed air pipeline and the compressed air purge manifold 4 share a set of compressed air switch valves and air supply pipelines. Such a setting can simultaneously adjust the compressed air supply of the compressed air purge manifold 4 and the aerosol cooling manifold 3 through a unified control system to achieve coordinated work between the two, that is, the opening and closing states of the first valve 5 and the second valve 6 are consistent. In addition, the system also has the function of independent follow-up opening and closing, that is, the opening or closing state of each compressed air purge manifold 4 can be flexibly adjusted according to the actual cooling needs and process requirements of the steel strip 2 to achieve the best cooling effect.

[0070] In a specific embodiment, the aerosol cooling unit may include a plurality of aerosol cooling manifolds 3, each of the aerosol cooling manifolds 3 including a plurality of aerosol nozzles 31 spaced apart along the width direction Y of the strip steel 2, and the aerosols sprayed from the aerosol nozzles 31 of two adjacent aerosol cooling manifolds 3 in the same aerosol cooling unit may intersect at least at the boundary, so that the aerosol sprayed from the aerosol cooling manifold 3 may directly cover the corresponding cooling area 7, thereby ensuring that the strip steel 2 in the corresponding cooling area 7 may be cooled efficiently and comprehensively in the first time.

[0071] Furthermore, two adjacent aerosol cooling manifolds 3 in the same aerosol cooling unit may be spaced apart by a first spacing; and in two adjacent aerosol cooling units, the two most adjacent aerosol cooling manifolds 3 may be spaced apart by a second spacing, wherein the first spacing is smaller than the second spacing.

[0072] A second spacing may be provided between two adjacent aerosol cooling units, and the second spacing is used to provide a corresponding space for setting the above-mentioned air curtain separation zone on the surface of the strip steel 2, and the second spacing is greater than the first spacing. Compared with the prior art in which the above-mentioned compressed air purge header 4 is not provided, by increasing the spacing between the two most adjacent aerosol cooling headers 3, the gas purged by the compressed air purge header 4 will not directly contact with excessive cooling water, thereby further improving the separation and diversion effects of the aerosol sprayed by the aerosol cooling header 3.

[0073] It should be noted that, in the description of this application, the terms "first", "second", etc. are only used for descriptive purposes and to distinguish similar objects. There is no order of precedence between the two, and they cannot be understood as indicating or implying relative importance. In addition, in the description of this application, unless otherwise specified, the meaning of "plurality" is two or more.

[0074] The above-mentioned various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other. Each embodiment focuses on the differences from other embodiments.

[0075] The above are only a few embodiments of the present invention. Although the embodiments disclosed by the present invention are as above, the contents are only embodiments adopted for facilitating the understanding of the present invention and are not used to limit the present invention. Any technician in the technical field to which the present invention belongs can make any modification and change in the form and details of the embodiments without departing from the spirit and scope disclosed by the present invention, but the patent protection scope of the present invention shall still be subject to the scope defined by the attached claims.

Claims

1. A mist cooling device at the outlet of a hot-rolled ultra-thin strip mill, characterized in that: The gas mist cooling device at the outlet of the hot-rolled ultra-thin strip mill comprises: An aerosol cooling manifold system for being arranged above the steel strip, the aerosol cooling manifold system comprising a plurality of aerosol cooling manifolds arranged at intervals along the length direction of the steel strip, a compressed air pipeline connected to the aerosol cooling manifolds, and a first valve arranged on the compressed air pipeline; at least one of the aerosol cooling manifolds forms a group of aerosol cooling units; A compressed air purge header, the compressed air purge header is arranged between two adjacent aerosol cooling units, and a second valve is arranged on the compressed air purge header; When the first valve is in an open state and the second valve is also in an open state, the cooling mist sprayed from at least one of the aerosol cooling manifolds in the aerosol cooling unit forms cooling water on the strip; the compressed air sprayed from the compressed air purge manifold separates the cooling water to form a plurality of independent cooling areas on the strip.

2. The gas mist cooling device at the outlet of the hot rolling ultra-thin strip mill according to claim 1, characterized in that: The compressed air purge manifold is provided with a plurality of partition nozzles, and the plurality of partition nozzles are evenly spaced and arranged in a direction perpendicular to the length of the strip.

3. The gas mist cooling device at the outlet of the hot rolling ultra-thin strip mill according to claim 2, characterized in that: The directions in which the gas is ejected from the plurality of partition nozzles are inclined at a predetermined angle, and can drive the cooling water on the strip to be discharged in the width direction of the strip.

4. The gas mist cooling device at the outlet of the hot rolling ultra-thin strip mill according to claim 3, characterized in that: The predetermined angle is positively correlated with the running speed of the steel strip and the amount of cooling water formed by the gas mist cooling header on the surface of the steel strip.

5. The gas mist cooling device at the outlet of the hot-rolled ultra-thin strip mill according to claim 4, characterized in that: The predetermined angle is between 0° and 15°.

6. The gas mist cooling device at the outlet of the hot rolling ultra-thin strip mill according to claim 5, characterized in that: The gas ejected from the plurality of partition nozzles is in the same direction, and the gas ejected from the partition nozzles discharges the cooling water toward the same side in the width direction of the steel strip.

7. The gas mist cooling device at the outlet of the hot rolling ultra-thin strip mill according to claim 5, characterized in that: The gas ejected from the plurality of partition nozzles is in different directions. Some of the partition nozzles eject the gas to discharge the cooling water toward one side in the width direction of the strip, while some of the partition nozzles eject the gas to discharge the cooling water toward the other side in the width direction of the strip.

8. The gas mist cooling device at the outlet of the hot-rolled ultra-thin strip mill according to claim 1, characterized in that: The aerosol cooling device at the outlet of the hot-rolled ultra-thin strip mill further comprises: a compressed air system, which is respectively connected to the compressed air pipeline and the compressed air purge header.

9. The gas mist cooling device at the outlet of the hot rolling ultra-thin strip mill according to claim 8, characterized in that: The opening and closing states of the first valve and the second valve are consistent.

10. The gas mist cooling device at the outlet of the hot rolling ultra-thin strip mill according to claim 1, characterized in that: The aerosol cooling unit comprises a plurality of aerosol cooling headers, each of which comprises a plurality of aerosol nozzles spaced apart along the width direction of the steel strip, and the aerosols sprayed from the aerosol nozzles of two adjacent aerosol cooling headers in the same aerosol cooling unit can intersect at least at a boundary.

11. The gas mist cooling device at the outlet of the hot rolling ultra-thin strip mill according to claim 10, characterized in that: Two adjacent aerosol cooling headers in the same aerosol cooling unit are spaced apart by a first spacing, and two most adjacent aerosol cooling headers in two adjacent aerosol cooling units are spaced apart by a second spacing, and the first spacing is smaller than the second spacing.

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