A post rolling cooling system with continuously variable water crown

Abstract

This invention relates to the field of metallurgical steel plate cooling technology, specifically to a post-rolling cooling system with continuously variable water crown. The system includes a post-rolling cooling device containing several spray boxes arranged sequentially along the rolling direction. A damping plate is installed on the inner wall of each spray box, dividing the space into an upper inlet zone and a lower outlet zone. Several holes are located on the bottom plate of the outlet zone, each containing a nozzle. All nozzles form four different water crown curve boundaries on the outlet zone bottom plate. Spray boxes with the same water crown curve boundary are grouped together, meaning the water crown of each spray box group increases sequentially along the rolling direction. This invention eliminates the need for a crown valve and edge shielding mechanism in cooling systems, effectively reducing the maintenance intensity of traditional cooling equipment and lowering company operating costs. Furthermore, it improves the uniformity of transverse temperature cooling of the steel plate through flexible process control.

Description

Technical Field

[0001] This invention relates to the field of metallurgical steel plate cooling technology, specifically to a post-rolling cooling system with continuously variable water crown. Background Technology

[0002] Currently, many medium / wide / thick plate production lines are equipped with multi-functional post-rolling cooling equipment after the rolling mill, featuring TMCP / DQ processes. These two processes are increasingly being used in the production of low-cost or high-value-added products, such as those using water as a substitute for gold. A key factor restricting the development of highly water-cooled products is the control of the uniformity of transverse temperature cooling in the steel plate, preventing overcooling at the edges. The quality of transverse temperature cooling uniformity determines the product's plate shape, which necessitates the control of water flow density, meaning the water flow density in the center is greater than that on the sides.

[0003] In existing technologies, the water crown control of multifunctional control cooling equipment is divided into three categories:

[0004] The first type, such as CN2538808Y, achieves water crown control by changing the density of the nozzles' lateral arrangement. However, this type of arrangement can only achieve water crown control within a certain specification range and cannot cover all specifications of products.

[0005] The second type, such as CN108114995A, controls the water crown by controlling the water crown valves on both sides. This requires the joint control of components such as the water crown valve assembly, flow meter, and side shielding mechanical structure. It has high requirements for the accuracy of the water crown valve and the flow meter, which increases maintenance costs. If the fault is not handled in time, it will affect the use of the water cooling equipment.

[0006] The third type, such as CN204735541U, uses edge shielding control. The shielding components used are virtually unavoidable to rust in high-temperature and high-humidity environments, which also increases maintenance costs. Once rust occurs and causes jamming, it will lead to large deviations in the movement position, seriously affecting the uniformity of transverse cooling of the steel plate.

[0007] To adapt to the steel industry's trend towards "water-based steelmaking," the frequency of use of ultra-fast cooling equipment has increased significantly, and sufficiently low termination cooling temperatures are required to meet the demands of microstructure and performance control. Therefore, there is an urgent need for an ultra-fast cooling equipment control system that is easy to maintain, has a low failure rate, and can ensure stable appearance and performance of steel plates. Summary of the Invention

[0008] To address technical issues such as susceptibility to malfunctions and difficulty in maintenance, this invention provides a post-rolling cooling system with continuously variable water crown. This system eliminates the crown valve and edge shielding mechanism found in existing technologies, effectively reducing the maintenance intensity of traditional control cooling equipment and lowering company operating costs. Furthermore, it improves the uniformity of transverse temperature cooling of steel plates through flexible process control.

[0009] This invention provides a post-rolling cooling system with continuously variable water crown, including a post-rolling cooling device disposed between a pre-straightening mill and the pre-straightening mill, and further comprising:

[0010] The post-rolling cooling device is equipped with several spray boxes, all of which are distributed sequentially along the rolling direction. The spray boxes are used to spray cooling water.

[0011] The inner wall of the spray box is equipped with a damping plate, which divides the spray box into an upper water inlet area and a lower water outlet area. The water inlet area is equipped with a water inlet, and the bottom plate of the water outlet area is equipped with several holes with internal threads. Each hole is equipped with a nozzle to spray the water in the spray box downwards.

[0012] All nozzles are arranged in four different water convexity curve boundary shapes on the bottom plate of the water outlet area of ​​the spray box. There are four different water convexity curve boundary shapes. Spray boxes with the same water convexity curve boundary shape are grouped together, that is, spray box groups with four different water convexity curve boundary shapes. The water convexity of each spray box group increases sequentially along the rolling direction.

[0013] Furthermore, the spray box groups with four different water-convexity boundary shapes are the first water-convexity spray box group, the second water-convexity spray box group, the third water-convexity spray box group, and the fourth water-convexity spray box group. The water-convexity curves corresponding to the first water-convexity spray box group, the second water-convexity spray box group, the third water-convexity spray box group, and the fourth water-convexity spray box group are water-convexity curve one, water-convexity curve two, water-convexity curve three, and water-convexity curve four, respectively.

[0014] The nozzle distribution of the spray box bottom plate of water convexity curve one is composed of the boundaries ab, bb′, b′a′, and a′a connected end to end. Boundaries ab and b′a′ are the long side and the short side, respectively. They are both straight lines and parallel. Boundaries a′a and bb′ are symmetrically distributed and their shapes conform to the boundaries of half a period of sine curve one.

[0015] The nozzle distribution on the bottom plate of the spray box of the second water convexity curve consists of the boundary cd, boundary dd′, boundary d′c′, and boundary c′c connected end to end. Boundary cd and boundary d′c′ are the long side and the short side, respectively. They are both straight lines and parallel. Boundary c′c and boundary dd′ are symmetrically distributed and their shapes conform to the boundary of half period of the second sine curve.

[0016] The nozzle distribution on the bottom plate of the spray box of the water convexity curve three is composed of the boundary ef, boundary ff′, boundary f′e′, and boundary e′e connected end to end. Boundary ef and boundary f′e′ are the long side and the short side, respectively. They are both straight lines and parallel. Boundary e′e and boundary ff′ are symmetrically distributed and their shapes conform to the boundary of half period of sine curve three.

[0017] The nozzle distribution on the bottom plate of the spray box of the water convexity curve four is composed of the boundary gh, boundary hh′, boundary h′g′, and boundary g′g connected end to end. Boundary gh and boundary h′g′ are the long side and the short side, respectively. They are both straight lines and parallel. Boundary g′g and boundary hh′ are symmetrically distributed and their shapes conform to the boundary of half period of sine curve four.

[0018] The distances between boundaries ab, cd, ef, and gh are equal.

[0019] Furthermore, the sine curve coincides with a function The half-period boundary; the coincidence function of the sine curve. The half-period boundary; the triple coincidence function of the sine curve. The half-period boundary; the four coincidence functions of the sine curve The half-cycle boundary.

[0020] Furthermore, the spacing between two adjacent internally threaded holes on the base plate is 55mm. Each hole is equipped with a nozzle that is coaxial with it and perpendicular to the base plate of the spray box. The nozzle length is 90mm, which can ensure that the water is sealed in a short time after cooling and ensure that there is no residual water on the surface of the steel plate during fast rolling.

[0021] Furthermore, the nozzle includes an inlet section and an outlet section. The inner diameter of the inlet section gradually transitions from 5mm to 3.5mm from top to bottom, with an inward inclination angle of 1°. The variable diameter design from coarse to fine inlet to outlet section can not only further stabilize the water flow, but also increase the water flow pressure and improve the cooling rate during the variable diameter process. The inner diameter of the outlet section is 3.5mm.

[0022] Furthermore, the spray box has two water inlets in the water inlet area, each with a flow stabilizer inside. The distance between the two water inlets is 800–3200 mm. The specific distance between the two water inlets is determined according to the width of the production line.

[0023] Furthermore, the flow stabilizer is a plate fixed to the inner wall of the inlet. The plate has evenly distributed water holes. The water flow is obstructed between the holes, flows to the surroundings along the corresponding obstruction surface, and flows out through the water holes. After the flow stabilizer is activated, the water flow is gentle, uniform and stable.

[0024] Furthermore, the damping plate is equipped with several water holes, each 4mm in diameter. The shape of the perimeter of all water holes is identical to the shape of the water convexity curve boundary of the corresponding water outlet area's bottom plate. The damping plate divides the spray box's inner chamber into upper and lower layers, buffering the water flow entering the upper chamber and helping to stabilize the water flow in the lower layer. The edges of the damping plate are designed according to the water convexity shape of the spray box's spray area to prevent the water pressure from increasing due to the smaller volume on both sides, thus avoiding a situation where the water pressure on the sides of the spray box is greater than that in the middle.

[0025] Furthermore, the water holes in the middle section of the damping plate are evenly spaced at 65mm intervals, while the water holes on both sides of the damping plate are distributed in an arithmetic sequence outwards. This effectively avoids excessive water pressure caused by the smaller volume of the cavities on both sides under the same water volume conditions.

[0026] Furthermore, each spray box has two overflow holes on its outer surface, through which the pressure inside the spray box and the water flow pressure are constantly adjusted.

[0027] The beneficial effects of this invention are as follows:

[0028] (1) The present invention eliminates the convex valve and side shielding mechanism in the water-cooled structure of the prior art, which can not only effectively reduce the maintenance intensity of traditional control cooling equipment, but also reduce operating costs.

[0029] (2) In order to ensure the uniformity of transverse cooling of steel plate, the present invention sets four water convexity curves and arranges the water flow distribution at the edge of the spray box chamber according to the four water convexity curves. In use, the spray boxes with the four water convexity curves discharge water in combination. According to the steel plate specifications, cooling process and other conditions, different combinations of spray boxes with different water convexity curves are carried out. Under various processes, extremely high transverse temperature uniformity can be maintained, and extremely stable cooling effect can be obtained, thereby obtaining excellent plate shape.

[0030] (3) Under pressure of 0.2-0.5MPa, the inlet flow stabilizer, the spray box damping plate, and the variable diameter nozzle achieve three-stage flow stabilization;

[0031] (4) The plate of the inlet stabilizer is provided with evenly distributed water holes. The water flow is blocked between the holes and flows to the surrounding area along the corresponding obstruction surface, and then flows out through the water holes. After the water flow is stabilized, the water flow is gentle, uniform and stable.

[0032] (5) The variable diameter design from coarse to fine at the inlet to outlet section can not only further stabilize the water flow, but also increase the water flow pressure and improve the cooling rate during the variable diameter process.

[0033] (6) Adjust the pressure inside the spray box and the water flow pressure at the overflow hole at all times;

[0034] (7) The lookup table method with self-learning function for different water convexity combinations can perform convexity self-learning by placing it in the high temperature scan after ultra-fast cooling, or by manually giving the convexity for self-learning, which is simple to use. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 This is a schematic diagram of the structure of each spray box in the cooling system according to a specific embodiment of the present invention.

[0037] Figure 2 This is a diagram showing the distribution of water holes on the bottom plate of the water outlet area in a specific embodiment of the present invention, based on the water convexity curve of the spray box.

[0038] Figure 3 This is a diagram showing the distribution of water holes on the bottom plate of the water outlet area in the second embodiment of the spray box water convexity curve of the present invention.

[0039] Figure 4 This is a diagram showing the distribution of water holes on the bottom plate of the water outlet area in the spray box according to a specific embodiment of the present invention, specifically the water convexity curve three.

[0040] Figure 5 This is a diagram showing the distribution of water holes on the bottom plate of the water outlet area in the spray box according to a specific embodiment of the present invention, which is the water convexity curve four.

[0041] Figure 6 These are schematic diagrams of four water convexity sine curves according to specific embodiments of the present invention.

[0042] Figure 7 This is a cross-sectional view of the nozzle in a specific embodiment of the present invention.

[0043] Figure 8 This is a diagram showing the distribution of water holes on the damping plate of the spray box water convexity curve according to a specific embodiment of the present invention.

[0044] Figure 9 This is a diagram showing the distribution of water holes on the damping plate of the spray box water convexity curve two according to a specific embodiment of the present invention.

[0045] Figure 10 This is a diagram showing the distribution of water holes on the damping plate of the spray box water convexity curve three in a specific embodiment of the present invention.

[0046] Figure 11 This is a diagram showing the distribution of water holes on the damping plate of the spray box water convexity curve four in a specific embodiment of the present invention.

[0047] Figure 12This is a diagram showing the cooling temperature effect of a steel plate obtained by scanning with a temperature surface scanner according to a specific embodiment of the present invention.

[0048] Figure 13 These are two images showing the cooling temperature effect of a steel plate obtained by scanning with a temperature surface scanner according to a specific embodiment of the present invention.

[0049] In the diagram, 1-inlet, 2-damping plate, 3-overflow hole, 4-outlet area, 5-flow stabilizer, 6-inlet area, 7-inlet section, 8-outlet section, 11-water convection curve one, 21-water convection curve two, 31-water convection curve three, 41-water convection curve four; a, b, c, d, e, f, g, h, a′, b′, c′, d′, e′, f′, g′, and h′ are all boundary points of the outlet area of ​​the spray box bottom plate. Detailed Implementation

[0050] To enable those skilled in the art to better understand the technical solutions of this invention, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this invention.

[0051] Example 1

[0052] A post-rolling cooling system with continuously variable water crown includes a post-rolling cooling device located after the rolling mill and pre-straightening mill, and before the hot straightening mill. Several spray boxes are arranged inside the post-rolling cooling device for spraying cooling water. The system also includes:

[0053] like Figure 1 The diagram illustrates the structure of a single spray box. A damping plate 2 is installed on the inner wall of the spray box, dividing the interior into an upper water inlet zone 6 and a lower water outlet zone 4. The damping plate 2 buffers the water flow entering the water inlet zone 6, helping to stabilize the water flow in the water outlet zone 4. The damping plate 2 has several water holes, all of which have the same periphery shape as the water convexity curve of the bottom plate of the water outlet zone 4. The diameter of the water holes is 4 mm.

[0054] All nozzles are arranged in a water-convex curve boundary shape on the bottom plate of the spray box outlet area 4. There are four different water-convex curve boundary shapes. Spray boxes with the same water-convex curve boundary shape are grouped together, resulting in four different water-convex curve boundary shape groups. The water-convexity of each spray box group increases sequentially along the rolling direction. The four different water-convex curve boundary shape groups are designated as the first water-convex spray box group, the second water-convex spray box group, the third water-convex spray box group, and the fourth water-convex spray box group. Figure 6The water crown curves corresponding to the first, second, third, and fourth water crown spray box groups are water crown curve 11, water crown curve 21, water crown curve 31, and water crown curve 41, respectively. The water crown formed by water crown curve 11, water crown curve 21, water crown curve 31, and water crown curve 41 increases sequentially.

[0055] like Figure 2 The diagram shows that the water outlet boundary of the water convexity curve 11 is composed of boundaries ab, bb′, b′a′, and a′a connected end-to-end. Boundaries ab and b′a′ are the long and short sides, respectively, both straight and parallel. Boundaries a′a and bb′ are symmetrically distributed and their shapes conform to the half-period boundary of sine curve 1. Sine curve 1 is...

[0056] like Figure 3 The diagram shows that the outlet zone boundary of water convexity curve 21 is composed of boundaries cd, dd′, d′c′, and c′c connected end-to-end. Boundaries cd and d′c′ are the long and short sides, respectively, both straight and parallel. Boundaries c′c and dd′ are symmetrically distributed and their shapes conform to the half-period boundary of sine curve 2. Water convexity curve 21 is...

[0057] like Figure 4 The diagram shows that the outlet zone boundary of the water convexity curve 31 is composed of boundaries ef, ff′, f′e′, and e′e connected end-to-end. Boundaries ef and f′e′ are the long and short sides, respectively, both being straight lines and parallel. Boundaries e′e and ff′ are symmetrically distributed, and their shapes conform to the half-period boundary of sine curve 3. Sine curve 3 is...

[0058] like Figure 5 The diagram shows that the outlet zone boundary of the water convexity curve 41 is composed of boundaries gh, hh′, h′g′, and g′g connected end-to-end. Boundaries gh and h′g′ are the long and short sides, respectively, both being straight lines and parallel. Boundaries g′g and hh′ are symmetrically distributed, and their shapes conform to the half-period boundary of sine curve 4. Sine curve 4 is...

[0059] from Figure 2-5 It can also be seen that the bottom plate of each spray box water outlet area has eleven rows of holes, with the holes evenly spaced. The distance between two adjacent holes on the bottom plate is 55mm, and the distances between the boundaries ab, cd, ef, and gh are equal.

[0060] like Figures 8-11 The figures show the distribution of water holes on the damping plate 2 corresponding to the water box convexity curves 1-11, 2-21, 3-31, and 4-41 of the present invention. As can be seen from the figures, the water holes in the middle part of the damping plate 2 are evenly spaced with a spacing of 65mm, while the water holes on both sides of the damping plate are distributed in an arithmetic progression outwards. This effectively avoids excessive water pressure caused by the smaller volume of the cavities on both sides under the same water volume conditions.

[0061] The spray box water inlet area 6 is equipped with two water inlets 1 ( Figure 1 From the main viewing angle, another water inlet 1 is arranged side by side but is obstructed (not shown). Each water inlet 1 is equipped with a flow stabilizer 5. The distance between the two water inlets is determined according to the width of the production line, ranging from 800 to 3200 mm. The flow stabilizer 5 is a plate fixed to the inner wall of the water inlet 1. The plate has evenly distributed water holes. The water flow is obstructed between the holes, flows to the surroundings along the corresponding obstruction surface, and flows out through the water holes. After the flow stabilizer is applied, the water flow is smooth, uniform, and stable.

[0062] The bottom plate of the water outlet zone 4 has several internally threaded holes, each containing a nozzle; the nozzle is 90mm long, ensuring that water is sealed off shortly after cooling, guaranteeing no residual water on the steel plate surface during rapid rolling. Figure 7 The figure shows a cross-sectional view of the nozzle. As can be seen from the figure, the nozzle includes an inlet section 7 and an outlet section 8. The inner diameter of the inlet section 7 gradually transitions from 5 mm to 3.5 mm from top to bottom, with an inward inclination angle of 1°. The variable diameter design from the inlet section 7 to the outlet section 8 can not only further stabilize the water flow, but also increase the water pressure and improve the cooling rate during the variable diameter process. The inner diameter of the outlet section 8 is 3.5 mm.

[0063] The water jet pressure of this invention can be adjusted from 0.2 to 0.5 MPa. Therefore, in order to stabilize the water flow pressure, two overflow holes 3 are designed on the left and right sides of the water outlet area 4 of the spray box, and overflow valves are installed in the overflow holes 3. When the water flow pressure in the system exceeds the set pressure, the water flow pressure in the system is controlled by adjusting the opening degree of the overflow valves on the left and right sides, so as to maintain a more stable cooling effect.

[0064] This invention also provides a post-rolling cooling control method with continuously variable water crown. Specifically, the number and combination of spray boxes with different water crown curves are configured in a control table. A high-temperature surface scanner at the inlet of the water-cooling equipment obtains the transverse temperature gradient before entering the controlled cooling equipment. Control is performed according to the correspondence between different combinations of water crown control curves configured in the control table and the transverse temperature gradient. Simultaneously, it has a self-learning function; a temperature surface scanner is also arranged at the outlet of the controlled cooling equipment to obtain the transverse temperature gradient after cooling, and this gradient is fed back to the comparison model and the operator. Based on the obtained transverse temperature gradient after cooling, the self-learning model adjusts the water crown combination, and the operator can also make manual adjustments. The adjusted results are automatically saved to the control table. Water crown control is achieved through this method, resulting in a more stable cooling effect through a continuous water crown control system.

[0065] Figure 12 , Figure 13 The images show the temperature effect of a steel plate obtained by scanning a temperature surface scanner under conventional rapid cooling conditions. As can be seen from the two images, the steel plate cooling of this invention can maintain extremely high lateral temperature uniformity, achieving an extremely stable cooling effect and thus obtaining an excellent plate shape.

[0066] Although the present invention has been described in detail with reference to the accompanying drawings and preferred embodiments, the present invention is not limited thereto. Various equivalent modifications or substitutions can be made to the embodiments of the present invention by those skilled in the art without departing from the spirit and essence of the invention, and such modifications or substitutions should all be within the scope of the present invention. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should also be covered within the protection scope of the present invention.

Claims

1. A post-rolling cooling system with continuously variable water crown, comprising a post-rolling cooling device disposed between a pre-straightening machine and a hot straightening machine, characterized in that, The post-rolling cooling device is equipped with several spray boxes, all of which are distributed sequentially along the rolling direction. The spray boxes are used to spray cooling water. The inner wall of the spray box is equipped with a damping plate, which divides the spray box into an upper water inlet area and a lower water outlet area. The water inlet area is equipped with a water inlet, and the bottom plate of the water outlet area is equipped with several holes with internal threads. Each hole is equipped with a nozzle to spray the water in the spray box downwards. All nozzles are arranged in four different water convexity curve boundary shapes on the bottom plate of the water outlet area of ​​the spray box. Spray boxes with the same water convexity curve boundary shape are grouped together, that is, spray box groups with four different water convexity curve boundary shapes. The water convexity of each spray box group increases sequentially along the rolling direction.

2. The post-rolling cooling system with continuously variable water crown as described in claim 1, characterized in that, Four spray box groups with different water convexity curve boundary shapes are designated as the first water convexity spray box group, the second water convexity spray box group, the third water convexity spray box group, and the fourth water convexity spray box group. The water convexity curves corresponding to the first water convexity spray box group, the second water convexity spray box group, the third water convexity spray box group, and the fourth water convexity spray box group are water convexity curve one, water convexity curve two, water convexity curve three, and water convexity curve four, respectively. The nozzle distribution on the bottom plate of the spray box of water convexity curve one is composed of the boundaries ab, bb′, b′a′, and a′a connected end to end. Boundaries ab and b′a′ are the long side and the short side, respectively. They are both straight lines and parallel. Boundaries a′a and bb′ are symmetrically distributed and their shapes conform to the boundaries of half a period of sine curve one. The nozzle distribution on the bottom plate of the spray box of the second water convexity curve consists of the boundary cd, boundary dd′, boundary d′c′, and boundary c′c connected end to end. Boundary cd and boundary d′c′ are the long side and the short side, respectively. They are both straight lines and parallel. Boundary c′c and boundary dd′ are symmetrically distributed and their shapes conform to the boundary of half period of the second sine curve. The nozzle distribution on the bottom plate of the spray box of the water convexity curve three is composed of the boundary ef, boundary ff′, boundary f′e′, and boundary e′e connected end to end. Boundary ef and boundary f′e′ are the long side and the short side, respectively. They are both straight lines and parallel. Boundary e′e and boundary ff′ are symmetrically distributed and their shapes conform to the boundary of half period of sine curve three. The nozzle distribution on the bottom plate of the spray box of the water convexity curve four is composed of the boundary gh, boundary hh′, boundary h′g′, and boundary g′g connected end to end. Boundary gh and boundary h′g′ are the long side and the short side, respectively. They are both straight lines and parallel. Boundary g′g and boundary hh′ are symmetrically distributed and their shapes conform to the boundary of half period of sine curve four. The distances between boundaries ab, cd, ef, and gh are equal.

3. A post-rolling cooling system with continuously variable water crown as described in claim 2, characterized in that, A sine curve coincident function The half-period boundary; the coincidence function of the sine curve. The half-period boundary; the triple coincidence function of the sine curve. The half-period boundary; the four coincidence functions of the sine curve The half-cycle boundary.

4. A post-rolling cooling system with continuously variable water crown as described in claim 1, characterized in that, The spacing between two adjacent internally threaded holes on the base plate is 55mm. Each hole is fitted with a nozzle that is coaxial with the base plate and perpendicular to it. The nozzle length is 90mm.

5. A post-rolling cooling system with continuously variable water crown as described in claim 1, characterized in that, The spray box has two water inlets in the water inlet area. Each water inlet is equipped with a flow stabilizer. The distance between the two water inlets is determined according to the width of the production line, ranging from 800 to 3200 mm.

6. A post-rolling cooling system with continuously variable water crown as described in claim 5, characterized in that, The flow stabilizer is a plate fixed on the inner wall of the inlet, and the plate has evenly distributed water holes.

7. A post-rolling cooling system with continuously variable water crown as described in claim 1, characterized in that, The damping plate is provided with several water holes, each with a diameter of 4mm. The shape of the periphery of all the water holes is the same as the shape of the water convexity curve boundary of the bottom plate of the corresponding water outlet area.

8. A post-rolling cooling system with continuously variable water crown as described in claim 7, characterized in that, The water holes in the middle part of the damping plate are evenly spaced with a spacing of 65mm, while the water holes on both sides of the damping plate are distributed in an arithmetic sequence outwards.

9. A post-rolling cooling system with continuously variable water crown as described in claim 1, characterized in that, Each spray box has two overflow holes on its outer side.

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