A novel rapid cooling manifold for rolled steel

Abstract

This invention provides a novel rapid cooling manifold for steel rolling, comprising an upper manifold, a lower manifold, and a water supply system. The upper manifold includes a main cavity and two sets of side cavities, connected by branch pipes with shut-off valves. The lower manifold has three chambers connected in parallel to the main and side water inlet pipes. Both the upper and lower manifolds are equipped with inclined nozzles. It achieves high-intensity uniform cooling by controlling the flow in zones, eliminating vapor film on the steel plate surface through inclined jets, reducing plate shape defects caused by uneven thermal stress, inhibiting grain growth and mixed crystal formation, improving the mechanical properties and microstructure uniformity of the steel, and reducing energy consumption. It is suitable for rapid cooling processes in medium and heavy plate rolling.

Description

Technical Field

[0001] This utility model relates to the field of rapid cooling technology for steel rolling, and specifically to a novel rapid cooling manifold for steel rolling. Background Technology

[0002] In the steel rolling industry, especially in the rolling of medium and heavy plates, rapid cooling is a crucial factor determining product performance and quality, and is a core component of thermomechanical control process (TMCP). Its main function is to achieve grain refinement, suppress austenite recrystallization and mixed grain phenomena by precisely and efficiently controlling the cooling of the high-temperature steel plate after rolling, thereby improving the mechanical properties and microstructure uniformity of the steel plate and increasing production efficiency.

[0003] The mainstream rapid cooling technology in the industry mostly adopts the method of manifold jet cooling water, that is, cooling water at a certain pressure is sprayed onto the surface of the steel plate through manifolds set above and below the steel plate to complete heat exchange. The existing manifolds have uneven water flow distribution in the cavity and are difficult to effectively eliminate the vapor film on the surface of the steel plate, resulting in insufficient contact between the cooling water and the steel plate surface, and significant differences in local cooling intensity. This unevenness will cause differences in cooling rate between the surface and core of the steel plate, and between the edge and the middle, which will lead to uneven distribution of thermal stress. This can easily cause thick plates to bend (C-shaped bend) or wavy deformation, affecting the flatness of the product.

[0004] Traditional manifolds make it difficult to flexibly adjust the cooling range according to the width of the rolled slab, often resulting in problems such as excessive cooling water spraying or insufficient local cooling. This not only increases energy consumption but may also cause fluctuations in the steel plate's performance due to local overcooling or insufficient cooling. Utility Model Content

[0005] To overcome the shortcomings of existing technologies, a novel rapid cooling manifold for rolled steel is provided to solve the problems mentioned in the background section.

[0006] To achieve the above objectives, a novel rapid cooling manifold for steel rolling is provided, comprising an upper manifold and a lower manifold. The upper and lower manifolds are connected to a water supply system via pipes. The upper manifold includes a main pipe and a main cavity. The main cavity is fixed below the main pipe by a bracket, and side cavities are respectively provided on both sides of the main cavity. A drain outlet is provided on the outer side of the side cavities. The main cavity and the side cavities are connected by a branch pipe with a shut-off valve on the back. Nozzles are evenly installed on the lower surface of the main cavity and the side cavities. The lower manifold includes a lower manifold, a main water inlet pipe, and side water inlet pipes. The internal chambers of the lower manifold are divided into three groups, and the three groups of chambers are respectively connected to the main water inlet pipe and two groups of side water inlet pipes. Lower nozzles are evenly installed on the upper surface of the lower manifold, and lower nozzles are evenly installed on the lower manifold on the side of the lower nozzles.

[0007] Furthermore, an installation plate is fixedly provided on the main pipe of the upper manifold, and at least two strip-shaped installation holes are provided on the installation plate. The upper manifold is fixed on the frame of the steel rolling production line.

[0008] Furthermore, both the nozzles of the upper manifold and the lower nozzle of the lower manifold are inclined, with an inclination angle of 30°-60°.

[0009] Furthermore, the lower manifold has three sets of chambers arranged horizontally in the lower manifold cavity. The middle set of chambers is connected to the main water inlet pipe, and the chambers on both sides are connected to the two sets of side water inlet pipes respectively.

[0010] Furthermore, the outer surface of the anti-collision block is provided with an arc-shaped transition structure, and the height of the anti-collision block is 20-30mm higher than the top of the lower nozzle.

[0011] Compared with existing technologies, the beneficial effects of this utility model are as follows: The main cavity and side cavity of the upper manifold are connected by a branch pipe with a shut-off valve, which allows for flexible adjustment of the cooling water flow rate in each cavity. Combined with the design of three independent chambers inside the lower manifold, it achieves precise distribution of cooling water in the width direction of the steel plate, avoiding local overcooling or insufficient cooling. Both the nozzles of the upper manifold and the lower nozzle of the lower manifold are inclined, and combined with the technology of inclined jet impacting the surface of the steel plate, it can effectively eliminate the vapor film on the surface of the steel plate, allowing fresh water to directly contact the high-temperature steel plate, while guiding the orderly flow of residual water, ensuring the stability of the micro-heat transfer process, reducing the formation of hard and brittle martensite at the edges and coarse ferrite in the core, improving the uniformity of toughness and strength in the thickness direction of the steel, and reducing the impact of banded structure on performance.

[0012] Uniform cooling distribution reduces the difference in cooling rates between the steel plate surface and core, lowering the risk of plate shape defects such as warping and wavy shapes caused by thermal stress imbalance. The shut-off valves of the upper manifold branch pipes and the independent water inlet design of multiple chambers in the lower manifold allow for flexible adjustment of the cooling range according to the width of the rolled slab. By reducing unnecessary cooling water flow, energy consumption is reduced, while also adapting to the cooling requirements of steel plates of different specifications. Attached Figure Description

[0013] Figure 1 This is a simplified diagram of the installation system according to an embodiment of the present utility model; Figure 2 This is a front view of the upper manifold according to an embodiment of the present utility model; Figure 3 This is a bottom view of the upper manifold according to an embodiment of the present invention; Figure 4 This is a top view of the upper manifold according to an embodiment of the present utility model; Figure 5 This is a side view of the upper manifold according to an embodiment of the present utility model; Figure 6This is a front view of the lower manifold according to an embodiment of the present utility model; Figure 7 This is a top view of the lower manifold according to an embodiment of the present invention;

[0014] Figure 8 This is a schematic cross-sectional view of the lower manifold according to an embodiment of the present invention.

[0015] In the diagram: 1. Upper manifold; 11. Main pipe; 12. Mounting plate; 13. Drain outlet; 14. Side cavity; 15. Main cavity; 16. Inlet; 17. Nozzle; 18. Branch pipe; 19. Shut-off valve; 2. Lower manifold; 21. Lower manifold cavity; 22. Anti-collision block; 23. Lower nozzle; 24. Main inlet pipe; 25. Side inlet pipe; 3. Water supply system. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] Reference Figures 1 to 8As shown, this utility model provides a novel rapid cooling manifold for steel rolling, including an upper manifold 1 and a lower manifold 2. The upper manifold 1 and the lower manifold 2 are connected to a water supply system 3 through pipes to form a coordinated cooling unit. The upper manifold 1 includes a main pipe 11 and a main cavity 15. The main cavity 15 is fixed below the main pipe 11 by a bracket, and side cavities 14 are respectively provided on both sides of the main cavity 15. A drain port 13 is provided on the outside of the side cavity 14, and a manual ball valve is provided. The ball valve is opened after the machine is shut down each day. Minutes are needed to drain impurities deposited in the cavity and prevent nozzle blockage. The main cavity 15 and the side cavity 14 are connected by a branch pipe 18 with a shut-off valve 19 on the back, allowing independent control of the water inlet to each cavity and the cooling water flow and shut-off of the side cavity 14. The main pipe 11 is connected to the water supply system 3 through the inlet 16. Water flows through the main pipe 11 to the main cavity 15, and then through the branch pipe 18 into the side cavity 14. Nozzles 17 are evenly installed on the lower surface of the main cavity 15 and the side cavity 14. The inclined water jet can impact the surface of the steel plate to break the vapor film and guide the residual water to flow orderly along the conveying direction, avoiding uneven cooling caused by local water accumulation. The manifold 2 includes a lower manifold 21, a main water inlet pipe 24, and side water inlet pipes 25. The lower manifold 21 has three internal chambers, which are connected to the main water inlet pipe 24 and two sets of side water inlet pipes 25, respectively. Lower nozzles 23 are evenly installed on the upper surface of the lower manifold 21, and lower nozzles 23 are also evenly installed on the sides of the lower manifold 21. The lower manifold 21 is divided into three independent chambers by two vertical partitions. The three chambers are connected to the main water inlet pipe 24 and two sets of side water inlet pipes 25, respectively, to achieve independent control of water flow. The main water inlet pipe 24 and the side water inlet pipes 25 are both connected to the water supply system 3 and are equipped with electromagnetic flow valves. The water inlet of each chamber can be adjusted by the production line PLC system. When the width of the rolled slab is small, only the main water inlet pipe 24 of the middle chamber is opened; when the width is large, the middle chamber and one side chamber are opened simultaneously to reduce ineffective cooling water consumption.

[0018] An installation plate 12 is fixedly installed on the main pipe 11 of the upper manifold 1. The installation plate 12 has at least two strip-shaped installation holes and is connected to the preset installation seat on the frame by bolts. The height of the upper manifold 1 can be finely adjusted according to the thickness of the steel plate. The lower manifold 2 is fixed to the foundation of the production line by the bottom bracket and is vertically aligned with the upper manifold 1 to ensure that the nozzle spray range completely covers the width of the steel plate. The upper manifold 1 is fixed on the frame of the steel rolling production line, and the lower manifold 2 is installed below the frame. The two are symmetrically distributed on the upper and lower sides of the steel plate conveying path to ensure that the upper and lower surfaces of the steel plate can be cooled evenly.

[0019] The nozzle 17 of the upper manifold 1 and the lower nozzle 23 of the lower manifold 2 are both inclined, with an inclination angle of 30°-60°; to ensure that the cooling intensity of the lower surface of the steel plate matches that of the upper surface.

[0020] In the lower manifold 2, the three sets of chambers in the lower manifold cavity 21 are distributed in sequence along the horizontal direction. The middle set of chambers is connected to the main water inlet pipe 24, and the chambers on both sides are connected to the two sets of side water inlet pipes 25 respectively.

[0021] The outer surface of the anti-collision block 22 is provided with an arc-shaped transition structure, and the height of the anti-collision block 22 is 20-30mm higher than the top of the lower nozzle 23; this can prevent the nozzle from being damaged by collision during the steel plate conveying process.

[0022] Start the water supply system 3, remove impurities from the cooling water through the filter, and adjust the inlet water temperature to 25-30℃ to ensure that the water quality meets the cooling requirements.

[0023] Based on the width of the rolled slab, the PLC system automatically controls the shut-off valve 19 of the upper manifold 1 and the solenoid flow valve of the lower manifold 2: If the plate width is less than the width of the intermediate cavity: close the shut-off valves 19 of the two side cavities 14 and only open the intermediate cavity of the lower collection cavity 21; The plate width is located between the width of the intermediate cavity and the width of the main cavity and the single-sided cavity: when the main cavity 15 and the single-sided cavity 14 are opened, the intermediate cavity and the corresponding side cavity of the lower collection cavity 21 are opened simultaneously; The width of the plate is greater than the width of the main cavity and the width of the single-sided side cavity: three sets of chambers, namely the fully open main cavity 15, the two side cavities 14 and the lower collection cavity 21.

[0024] When the high-temperature steel plate enters the cooling zone via the conveyor rollers, the nozzles of the upper manifold 1 and the lower manifold 2 spray cooling water synchronously. The inclined jet breaks the vapor film on the surface of the steel plate, allowing the cooling water to directly contact the steel plate. At the same time, the residual water flows along the conveying direction to avoid local overheating or overcooling.

[0025] After the steel plate leaves the cooling zone, close nozzle 17 and lower nozzle 23, and open drain port 13 to clean the cavity.

[0026] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A new type of steel rolling rapid cooling header, comprising an upper header (1) and a lower header (2), characterized in that: The upper header (1) and the lower header (2) are communicated with the water supply system (3) through a pipeline, the upper header (1) comprises a main pipeline (11) and a main cavity (15), the main cavity (15) is fixed below the main pipeline (11) through a support, and side cavities (14) are arranged on both sides of the main cavity (15), a communication sewage outlet (13) is arranged outside the side cavities (14), the main cavity (15) and the side cavities (14) are communicated through branch pipes (18) with stop valves (19) on the back surfaces, and the main cavity (15) and the side cavities (14) are uniformly provided with nozzles (17) on the lower surfaces, the lower header (2) comprises a lower header cavity (21), a main water inlet pipe (24) and side water inlet pipes (25), the inner chamber of the lower header cavity (21) is divided into three groups, the three groups of chambers are connected with the main water inlet pipe (24) and two groups of side water inlet pipes (25) respectively, and the lower header cavity (21) is uniformly provided with lower nozzles (23) on the upper surface, and the lower header cavity (21) is uniformly provided with lower nozzles (23) on the side surface of the lower nozzles (23).

2. A new type of steel rolling rapid cooling header according to claim 1, characterized in that, The main pipeline (11) of the upper header (1) is fixedly provided with a mounting plate (12), at least two strip-shaped mounting holes are formed in the mounting plate (12), and the upper header (1) is fixed on the rack of the steel rolling production line.

3. A new type of steel rolling rapid cooling header according to claim 1, characterized in that, The nozzles (17) of the upper header (1) and the lower nozzles (23) of the lower header (2) are both arranged in an inclined manner, and the inclination angle is 30°-60°.

4. A new type of steel rolling rapid cooling header according to claim 1, characterized in that, The three groups of chambers in the lower header cavity (21) of the lower header (2) are distributed along the horizontal direction in sequence, the middle group of chambers is communicated with the main water inlet pipe (24), and the chambers on both sides are communicated with the two groups of side water inlet pipes (25) one by one.

5. A new type of steel rolling rapid cooling header according to claim 1, characterized in that, The outer surface of the anti-collision block (22) is provided with an arc-shaped transition structure, and the height of the anti-collision block (22) is higher than the top end of the lower nozzle (23) by 20-30 mm.

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