Hot rolled steel plate cooling device

Abstract

The present application discloses a hot-rolled steel plate cooling device, comprising: two groups of spray systems respectively mounted at the upper and lower ends of a transmission roller frame and a vibration motor mounted on the transmission roller frame, wherein each spray system comprises a rapid cooling part, a transition cooling part and a uniform cooling part which are sequentially connected to the spray main pipe; the rapid cooling part is provided with a spray end with a fixed angle a; the uniform cooling part is provided with a spray end with a fixed angle b; the angles c of the multiple spray ends of the transition cooling part sequentially change linearly from angle a to angle b along the discharge direction; wherein the vibration motor is arranged on the transmission roller frame in the transition cooling part. The present application divides the spray system into a rapid cooling part, a transition cooling part and a uniform cooling part, and can adaptively cool the steel plate in steps according to the temperature change of the steel plate after hot rolling, and finely control the cooling process of the steel plate, thereby optimizing the internal structure and performance of the steel plate, and improving product quality and production efficiency.

Description

Technical Field

[0001] The present application relates to the technical field of steel plate production, and in particular to a hot-rolled steel plate cooling device. Background Art

[0002] Hot rolled steel plate cooling device is a device used to quickly cool the steel plate after the hot rolling process to control its cooling rate and temperature distribution, which is crucial to the microstructure formation, mechanical properties and final product quality of the steel plate.

[0003] For the cooling of hot-rolled steel plates, the more common method is to use cooling water for spraying cooling. This method is widely used because of its simple operation and relatively low equipment cost.

[0004] In the related art, the method of directly impacting and cooling the steel plate with a vertically arranged spray head can cover the entire steel plate, which has better uniformity in cooling the steel plate. However, when the steel plate is cooled, the high temperature on the surface of the steel plate will quickly evaporate the cooling water, forming a steam film on the surface of the steel plate. The heat insulation effect of the steam film will slow down the heat transfer, which is not conducive to rapid cooling.

[0005] Although the inclined spray head can increase the shear force, destroy part of the steam film and improve the heat transfer efficiency, the uneven flow and redistribution of water on the surface of the steel plate during the continuous spraying process will form dry areas or overcooling areas, affecting the uniform cooling of the steel plate. Summary of the invention

[0006] The present application aims to solve one of the technical problems in the above-mentioned technology at least to some extent.

[0007] To this end, one purpose of the present application is to propose a hot-rolled steel plate cooling device, which divides the spray system into a rapid cooling part, a transition cooling part and a uniform cooling part. It can adaptively cool the steel plate in steps according to the temperature change of the steel plate after hot rolling, and finely control the cooling process of the steel plate, which not only optimizes the internal structure and performance of the steel plate, but also effectively controls the residual stress, thereby improving product quality and production efficiency.

[0008] To achieve the above-mentioned objectives, the first aspect of the present application proposes a hot-rolled steel plate cooling device, comprising: two groups of spray systems respectively mounted on the upper and lower ends of a transmission roller frame and a vibration motor installed on the transmission roller frame, wherein each of the spray systems comprises a rapid cooling part, a transition cooling part and a uniform cooling part which are sequentially connected to a spray main pipe; the rapid cooling part is provided with a spray end with a fixed angle a; the uniform cooling part is provided with a spray end with a fixed angle b; the angles c of the multiple spray ends of the transition cooling part sequentially change linearly from angle a to angle b along the discharge direction; wherein the vibration motor is arranged on the transmission roller frame in the transition cooling part.

[0009] The hot-rolled steel plate cooling device of the embodiment of the present application can quickly cool down the initial hot-rolled steel plate through the rapid cooling part, break the steam film, and improve the heat transfer efficiency; continue to smoothly cool down the hot-rolled steel plate after the initial cooling through the transition cooling part; and finally evenly cool the hot-rolled steel plate after the secondary cooling through the uniform cooling part. It can be dynamically adjusted according to the actual cooling needs of the steel plate, and can provide sufficient cooling capacity when rapid heat dissipation is required, and can maintain the cooling process in a more uniform manner after reaching a certain cooling degree, thereby improving the cooling efficiency of the hot-rolled steel plate and maintaining the uniformity of the internal structure and performance of the steel plate.

[0010] In addition, the hot-rolled steel plate cooling device proposed in the above-mentioned embodiment of the present application may also have the following additional technical features: in one embodiment of the present application, the rapid cooling part includes a first branch pipe and a water-gas mixing injection head, wherein the first branch pipe is connected to the spray main pipe; a plurality of the water-gas mixing injection heads are symmetrically arranged on the first branch pipe with the transmission center line of the transmission roller frame; wherein the angle a is the angle between the injection end of the water-gas mixing injection head and the horizontal direction.

[0011] In one embodiment of the present application, the water-gas mixing injection head includes a first bent tube, a first contraction head and an expansion hood, wherein one end of the first bent tube is connected to the first branch tube, and the other end is detachably connected to the first contraction head; the expansion hood is threadedly connected to the first contraction head, and a negative pressure hole is opened in the expansion hood near the end of the first contraction head.

[0012] In one embodiment of the present application, the transition cooling part includes a second branch pipe and a spray head, wherein a plurality of the second branch pipes are connected to the spray main pipe in sequence along the discharge direction; a plurality of the spray heads are symmetrically arranged on each of the second branch pipes with respect to the transmission center line of the transmission roller frame; wherein the angle c is the angle between the spray end of the spray head and the horizontal direction.

[0013] In one embodiment of the present application, the shower head includes a second bent tube and a second shrinking head, wherein one end of the second bent tube is connected to the second branch tube, and the other end is connected to the second shrinking head.

[0014] In one embodiment of the present application, the uniform cooling part includes a third branch pipe and a Laval nozzle, wherein the third branch pipe is connected to the spray main pipe; a plurality of Laval nozzles are sequentially arranged on the third branch pipe; wherein the angle b is the angle between the injection end of the Laval nozzle and the horizontal direction.

[0015] In one embodiment of the present application, the Laval nozzle includes a contraction portion, a throat, and an expansion portion which are integrally formed in sequence, wherein the contraction portion is connected to the third branch pipe.

[0016] In one embodiment of the present application, the angle a is any angle between 30 degrees and 60 degrees.

[0017] In one embodiment of the present application, the angle b is 90 degrees.

[0018] In one embodiment of the present application, the spray main pipe is externally connected to a water tank via a water pump, and a water collecting tank is provided below the transmission roller frame, and the water collecting tank is connected to the water tank via a cooling device.

[0019] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0021] Figure 1 is a schematic structural diagram of a hot-rolled steel plate cooling device according to an embodiment of the present application;

[0022] Figure 2 is a schematic structural diagram of a hot-rolled steel plate cooling device according to another embodiment of the present application;

[0023] Figure 3 is a schematic side view of a hot rolled steel plate cooling device according to an embodiment of the present application;

[0024] Figure 4 is a schematic structural diagram of a spray system according to an embodiment of the present application;

[0025] Figure 5 is a schematic structural diagram of a rapid cooling part according to an embodiment of the present application;

[0026] Figure 6 is a schematic structural diagram of a transition cooling part according to an embodiment of the present application;

[0027] Figure 7 is a schematic structural diagram of a uniform cooling part according to an embodiment of the present application;

[0028] As shown in the figure:

[0029] 100, rapid cooling part; 110, first branch pipe; 120, water-gas mixing injection head; 121, first bending pipe; 122, first contraction head; 123, expansion cover; 1231, negative pressure hole; 200, transition cooling part; 210, second branch pipe; 220, spray head; 221, second bending pipe; 222, second contraction head; 300, uniform cooling part; 310, third branch pipe; 320, Laval nozzle; 321, contraction part; 322, throat; 323, expansion part; 400, spray main pipe; 500, vibration motor; 600, transmission roller frame; 700, steel plate. DETAILED DESCRIPTION

[0030] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0031] The hot rolled steel plate cooling device according to the embodiment of the present application is described below with reference to the accompanying drawings.

[0032] like Figures 1 to 4 As shown, the hot-rolled steel plate cooling device of the embodiment of the present application may include two sets of spray systems respectively mounted on the upper and lower ends of the transmission roller frame 600 and a vibration motor 500 installed on the transmission roller frame 600.

[0033] It should be noted that due to the different positions above and below the transmission roller frame 600, the corresponding spraying systems require different spraying pressures. Therefore, the two groups of spraying systems are controlled separately to ensure the consistency of the two groups of spraying systems in double-sided spraying of the steel plate 700 on the transmission roller frame 600.

[0034] Each spray system includes a rapid cooling part 100, a transition cooling part 200 and a uniform cooling part 300 which are connected to the spray main pipe 400 in sequence.

[0035] As a possible situation, the rapid cooling part 100 , the transition cooling part 200 and the uniform cooling part 300 are respectively provided with pressure regulating valves to adjust the water pressures of the rapid cooling part 100 , the transition cooling part 200 and the uniform cooling part 300 .

[0036] The rapid cooling part 100 is provided with a spray end with a fixed angle a, the uniform cooling part 300 is provided with a spray end with a fixed angle b, and the angles c of the multiple spray ends of the transition cooling part 200 linearly change from angle a to angle b in sequence along the discharge direction.

[0037] It should be noted that angle a, angle b and angle c are all the angles between the corresponding spray ends and the horizontal direction, and the angle of angle a is smaller than the angle of angle c, that is, the spray ends of the rapid cooling part 100, the transition cooling part 200 and the uniform cooling part 300 gradually tend to be perpendicular to the steel plate 700.

[0038] Relevant staff can increase or decrease the number of rapid cooling parts 100, transition cooling parts 200 and uniform cooling parts 300 according to actual needs (such as changes in the length of the production line).

[0039] For example, when the cooling process production line of the steel plate 700 is long, multiple groups of rapid cooling parts 100, transition cooling parts 200 and uniform cooling parts 300 can be added to adapt to the length of the production line and the demand for cooling the steel plate 700. That is, when the steel plate 700 undergoes the cooling process, it can first pass through multiple groups of rapid cooling parts 100 for rapid cooling, then pass through multiple groups of transition cooling parts 200 for continued cooling, and finally pass through multiple groups of uniform cooling parts 300 for final uniform cooling.

[0040] The vibration motor 500 is disposed on a transfer roller frame 600 within the transition cooling part 200 .

[0041] As a possible situation, the vibration motor 500 is connected to one of the transmission rollers on the transmission roller frame 600. When the transmission roller rotates to transmit the steel plate 700, the high-frequency and low-amplitude vibration generated by the vibration motor 500 can be transmitted to the steel plate 700, thereby further promoting the redistribution of cooling water on the surface of the steel plate 700, reducing the local accumulation of water film, increasing the heat exchange area, and helping to destroy possible residual steam film, thereby improving cooling efficiency and uniformity.

[0042] Specifically, when the relevant staff cools the steel plate 700 , the steel plate 700 is transported by the transport roller frame 600 , so that the steel plate 700 passes through the rapid cooling part 100 , the transition cooling part 200 and the uniform cooling part 300 in sequence.

[0043] When the steel plate 700 first passes through the rapid cooling part 100, the rapid cooling part 100 quickly cools down the steel plate 700 through the spray end with an inclined angle a. The inclined spray angle can enable the water flow to generate a greater lateral shear force when contacting the surface of the steel plate 700, destroying the steam film that has been formed, so that the cooling water can more directly contact the high-temperature surface of the steel plate 700, thereby improving the heat exchange efficiency.

[0044] When the jetted water reaches the surface of the steel plate 700, the movement direction of the cooling water has not only a vertical downward component, but also a horizontal component. This composite movement not only enables the kinetic energy of the cooling water to hit the steel plate 700, enhancing its ability to penetrate the steam film and take away heat faster, but also enables the cooling water to flow on the steel plate 700.

[0045] After the steel plate 700 passes through the rapid cooling section 100, its temperature drops for the first time. Then, the steel plate 700 after the temperature drops continues to move to the transition cooling section 200 under the transmission of the transmission roller frame 600. The transition cooling section 200 linearly changes the angle c of multiple spray ends along the discharge direction, which not only adjusts the impact force of the water flow on the surface of the steel plate 700, but also optimizes the distribution and flow pattern of water droplets on the surface of the steel plate 700, which can better adapt to the cooling needs after the surface temperature of the steel plate 700 is reduced, reduce overcooling, and maintain the necessary cooling efficiency.

[0046] As the temperature of the steel plate 700 gradually decreases, the internal residual stress is gradually released, reducing the internal stress concentration caused by rapid cooling, and reducing the risk of thermal cracks and deformation. Through the transition cooling part 200, the temperature of the steel plate 700 can be smoothly transitioned, and the phase change process inside the steel plate 700 is more orderly, which promotes grain refinement and uniform phase distribution, such as the transformation of favorable phases such as austenite to pearlite, which helps to improve the mechanical properties and processing performance of the final product.

[0047] In addition, the vibration of the vibration motor 500 can further promote the redistribution of cooling water on the surface of the steel plate 700. As the angle c gradually changes, the shear force gradually weakens. The vibration of the vibration motor 500 can destroy the residual steam film on the surface of the steel plate 700 to compensate for the accumulation of the steam film caused by the change in the spray angle of the transition cooling part 200.

[0048] After the steel plate 700 is cooled twice in the transition cooling section 200, it is transferred to the uniform cooling section 300 by the transfer roller frame 600. Since the angle b is larger than the horizontal direction, the uniform cooling section 300 can cover the width direction of the steel plate 700 more comprehensively, which can not only eliminate the cooling blind spot, but also enable each part of the steel plate 700 to receive approximately the same amount of cooling water, thereby promoting a uniform temperature drop.

[0049] At this time, the internal microstructure of the steel plate 700 tends to be stabilized, so that the grains formed in the previous phase change process are further refined and homogenized, the internal residual stress is reduced, and the structural discontinuity or unevenness caused by the rapid temperature change is avoided. It is beneficial to control the grain size and the distribution optimization of the second phase, and the comprehensive mechanical properties of the steel plate 700 (such as strength, toughness, hardness, etc.) are improved.

[0050] In addition, as the steel plate 700 passes through the rapid cooling zone and the transition cooling section 200 in sequence, its temperature drops significantly. Therefore, when the steel plate 700 passes through the uniform cooling section 300, less steam film is generated on the surface of the steel plate 700. The vibration of the vibration motor 500 of the transition cooling section 200 can also transmit vibration to the uniform cooling section 300, thereby enabling the uniform cooling section 300 to perform uniform cooling of the steel plate 700 and efficient heat exchange.

[0051] To clearly illustrate the above embodiment, in one embodiment of the present application, the angle a is any angle between 30 degrees and 60 degrees.

[0052] For example, when the angle a is 30 degrees, the spray end of the rapid cooling part 100 sprays cooling water on the surface of the steel plate 700. Since the angle with the horizontal direction is small, the horizontal component of the water flow is large, which can promote the flow of water on the surface of the steel plate 700, contribute to the uniformity of the overall cooling, reduce the splashing of water droplets, improve the utilization efficiency of water, and reduce the slippery problem in the working environment.

[0053] When the angle a is 60 degrees, the spray end of the rapid cooling part 100 sprays cooling water onto the surface of the steel plate 700. Due to the large angle with the horizontal direction, the vertical downward component is large, and the steel plate 700 can be impacted with a faster water flow rate to accelerate cooling. This is suitable for scenarios that require rapid cooling, such as when it is necessary to control the grain size and optimize the mechanical properties of the steel plate 700.

[0054] When the angle a is 45 degrees, the spray end of the rapid cooling part 100 sprays cooling water onto the surface of the steel plate 700, which can provide sufficient cooling efficiency and maintain good water film coverage and uniformity. It can be suitable for most standard cooling needs and can effectively penetrate the steam film formed in the early stage without causing excessive impact on the surface of the steel plate 700.

[0055] To clearly illustrate the previous embodiment, in one embodiment of the present application, the angle b is 90 degrees, that is, the spray end of the uniform cooling part 300 is arranged perpendicular to the steel plate 700, which can make the width direction of the steel plate 700 covered more comprehensively and the cooling more uniform.

[0056] For example, if angle a is 45 degrees and angle b is 90 degrees, the multiple angles c of the spray end of the transition cooling part 200 can be set with an angle difference of 5 degrees along the discharge direction, that is, 50 degrees, 55 degrees, 60 degrees, 65 degrees, 70 degrees, 75 degrees, 80 degrees and 85 degrees respectively. The specific number and angle difference can be set according to the actual production line length and the target temperature required for the steel plate 700, and no excessive restrictions are made here.

[0057] In one embodiment of the present application, Figure 5 As shown, the rapid cooling part 100 includes a first branch pipe 110 and a water-gas mixing spray head 120 .

[0058] Among them, the first branch pipe 110 is connected to the spray main pipe 400, and multiple water-gas mixing injection heads 120 are symmetrically arranged on the first branch pipe 110 with the transmission center line of the transmission roller frame 600, wherein angle a is the angle between the injection end of the water-gas mixing injection head 120 and the horizontal direction.

[0059] To clearly explain the above embodiment, in one embodiment of the present application, the water-gas mixing injection head 120 includes a first bending tube 121 , a first contraction head 122 and an expansion cover 123 .

[0060] Among them, one end of the first bending tube 121 is connected to the first branch tube 110, and the other end is detachably connected to the first shrinking head 122. The expansion cover 123 is threadedly connected to the first shrinking head 122, and a negative pressure hole 1231 is opened at the end of the expansion cover 123 near the first shrinking head 122.

[0061] It should be noted that the water-gas mixing injection head 120 can mix cooling water and air so that the cooling water injected onto the surface of the steel plate 700 contains a large number of bubbles. When the bubbles burst on the surface of the steel plate 700, they can destroy the steam film on the surface of the steel plate 700, thereby further improving the heat exchange efficiency between the cooling water and the surface of the steel plate 700.

[0062] Specifically, after the cooling water passes through the spray main pipe 400 to reach the first branch pipe 110, and passes through the first bending pipe 121 and is sprayed out from the first contraction head 122, due to the Venturi effect, when the cooling water passes through the narrow first contraction head 122, its flow rate will increase. Correspondingly, according to Bernoulli's principle, the pressure in this area will decrease, and the external air will be sucked in through the negative pressure hole 1231 to mix the air and cooling water to form more bubbles, which will be sprayed out from the expansion cover 123.

[0063] In one embodiment of the present application, Figure 6 As shown, the transition cooling section 200 includes a second branch pipe 210 and a shower head 220 .

[0064] Among them, multiple second branch pipes 210 are connected to the spray main pipe 400 in sequence along the discharge direction, and each second branch pipe 210 is symmetrically arranged with multiple spray heads 220 around the transmission center line of the transmission roller frame 600, wherein angle c is the angle between the spray end of the spray head 220 and the horizontal direction.

[0065] To clearly illustrate the above embodiment, in one embodiment of the present application, the shower head 220 includes a second bending tube 221 and a second shrinking head 222 .

[0066] One end of the second bending tube 221 is connected to the second branch tube 210 , and the other end is connected to the second shrinking head 222 .

[0067] It should be noted that in the transition cooling part 200, the cooling water passes through the spray main pipe 400, the second branch pipe 210, the second bending pipe 221 and the second shrinking head 222 in sequence, and is sprayed out from the second shrinking head 222, and combined with the vibration effect of the vibration motor 500, the steel plate 700 in this part is cooled for the second time.

[0068] In one embodiment of the application, Figure 7 As shown, the uniform cooling part 300 includes a third branch pipe 310 and a Laval nozzle 320 .

[0069] The third branch pipe 310 is connected to the main spray pipe 400, and a plurality of Laval nozzles 320 are sequentially arranged on the third branch pipe 310, wherein the angle b is the angle between the spray end of the Laval nozzle 320 and the horizontal direction.

[0070] To clearly illustrate the above embodiment, in one embodiment of the present application, the Laval nozzle 320 includes a contraction portion 321 , a throat 322 , and an expansion portion 323 that are integrally formed in sequence, wherein the contraction portion 321 is connected to the third branch pipe 310 .

[0071] It should be noted that after the cooling water passes through the spray main pipe 400 and the third branch pipe 310, it is sprayed out from the Laval nozzle 320. The cooling water passes through the convergence effect of the contraction part 321, the flow rate increases, and passes through the throat 322. Finally, due to the inertia of the flow rate, it continues to accelerate and is sprayed out from the expansion part 323.

[0072] It is understandable that relevant staff can adaptively adjust the contraction diameter of the contraction part 321, the length of the throat 322 and the expansion degree of the expansion part 323 according to the implementation situation to meet the flow rate requirements, which is not limited here.

[0073] In one embodiment of the present application, the spray main pipe 400 is externally connected to a water tank via a water pump, and a water collecting tank is provided below the transmission roller frame 600, and the water collecting tank is connected to the water tank via a cooling device.

[0074] It should be noted that the water collection tank collects the cooling water sprayed onto the steel plate 700 for cooling, and after passing through the cooling device and the filtering device, it is transmitted to the water tank. The relevant staff can then control the water pump to pump the cooling water in the water tank back into the spray main pipe 400.

[0075] In summary, by dividing the spray system into a rapid cooling part 100, a transition cooling part 200 and a uniform cooling part 300, the steel plate 700 can be adaptively cooled in steps according to the temperature change of the steel plate 700 after hot rolling, and the cooling process of the steel plate 700 can be finely controlled, which not only optimizes the internal structure and performance of the steel plate 700, but also effectively controls the residual stress, improves the product quality and production efficiency; the rapid cooling part 100 is used to quickly cool the initial steel plate 700 to break the steam film and improve the heat transfer efficiency; the transition cooling part 200 is used to continue to steadily cool the steel plate 700 after the initial cooling; and the uniform cooling part 300 is used to finally uniformly cool the steel plate 700 after the secondary cooling. It can be dynamically adjusted according to the actual cooling demand of the steel plate 700, which can provide sufficient cooling capacity when rapid heat dissipation is required, and can maintain the cooling process in a more uniform manner after reaching a certain cooling degree, thereby improving the cooling efficiency of the steel plate 700 and maintaining the uniformity of the internal structure and performance of the steel plate 700.

[0076] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0077] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0078] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0079] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0080] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0081] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A hot rolled steel plate cooling device, characterized in that: The invention comprises two groups of spray systems respectively mounted on the upper and lower ends of a transmission roller frame (600) and a vibration motor (500) mounted on the transmission roller frame (600), wherein each of the spray systems comprises a rapid cooling part (100), a transition cooling part (200) and a uniform cooling part (300) which are sequentially connected to a spray main pipe (400); the rapid cooling part (100) is provided with a spray end with a fixed angle a; the uniform cooling part (300) is provided with a spray end with a fixed angle b; the angles c of the multiple spray ends of the transition cooling part (200) sequentially change linearly from angle a to angle b along the discharge direction; wherein the vibration motor (500) is arranged on the transmission roller frame (600) at the transition cooling part (200).

2. The hot rolled steel plate cooling device according to claim 1, characterized in that: The rapid cooling part (100) comprises a first branch pipe (110) and a water-gas mixing injection head (120), wherein the first branch pipe (110) is connected to the spray main pipe (400); a plurality of the water-gas mixing injection heads (120) are symmetrically arranged on the first branch pipe (110) with respect to the transmission center line of the transmission roller frame (600); wherein the angle a is the angle between the injection end of the water-gas mixing injection head (120) and the horizontal direction.

3. The hot rolled steel plate cooling device according to claim 2, characterized in that: The water-gas mixing injection head (120) comprises a first bent tube (121), a first shrinking head (122) and an expansion cover (123), wherein one end of the first bent tube (121) is connected to the first branch tube (110), and the other end is detachably connected to the first shrinking head (122); the expansion cover (123) is threadedly connected to the first shrinking head (122), and a negative pressure hole (1231) is provided on the expansion cover (123) near the end of the first shrinking head (122).

4. The hot rolled steel plate cooling device according to claim 1, characterized in that: The transition cooling part (200) comprises a second branch pipe (210) and a spray head (220), wherein a plurality of the second branch pipes (210) are sequentially connected to the spray main pipe (400) along the discharge direction; a plurality of the spray heads (220) are symmetrically arranged on each of the second branch pipes (210) about the transmission center line of the transmission roller frame (600); wherein the angle c is the angle between the spray end of the spray head (220) and the horizontal direction.

5. The hot rolled steel plate cooling device according to claim 4, characterized in that: The spray head (220) comprises a second bent tube (221) and a second shrinking head (222), wherein one end of the second bent tube (221) is connected to the second branch tube (210), and the other end is connected to the second shrinking head (222).

6. The hot rolled steel plate cooling device according to claim 1, characterized in that: The uniform cooling portion (300) comprises a third branch pipe (310) and a Laval nozzle (320), wherein the third branch pipe (310) is connected to the main spray pipe (400); a plurality of Laval nozzles (320) are sequentially arranged on the third branch pipe (310); wherein the angle b is the angle between the spray end of the Laval nozzle (320) and the horizontal direction.

7. The hot rolled steel plate cooling device according to claim 6, characterized in that: The Laval nozzle (320) comprises a contraction portion (321), a throat (322), and an expansion portion (323) which are integrally formed in sequence, wherein the contraction portion (321) is connected to the third branch pipe (310).

8. The hot rolled steel plate cooling device according to claim 1, characterized in that: The angle a is any angle between 30 degrees and 60 degrees.

9. The hot rolled steel plate cooling device according to claim 1, characterized in that: The angle b is 90 degrees.

10. The hot rolled steel plate cooling device according to claim 1, characterized in that: The spray main pipe (400) is externally connected to a water tank via a water pump, and a water collecting tank is provided below the transmission roller frame (600), and the water collecting tank is connected to the water tank via a cooling device.

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