Aerosol cooling system for hot-rolled strip steel

Abstract

The invention provides a hot-rolled strip steel aerial fog cooling system, belongs to the technical field of metal rolling, and aims to solve the problem that the existing aerial fog cooling effect is not ideal. The hot-rolled strip steel aerial fog cooling system comprises an aerial fog nozzle array (1), a lifting control system (2), a translation control system (3), an air supply system (4) and a water supply system (5), the aerosol nozzle array (1) comprises upper nozzle assemblies (11) and lower nozzle assemblies (12), and the lifting control system (2) can independently enable each upper nozzle assembly (111) and each lower nozzle assembly (121) to move up and down; and the translation control system (3) can independently enable each upper nozzle group (111) and each lower nozzle group (121) to reciprocate along the width direction of the hot-rolled strip steel (7). According to the hot-rolled strip steel aerial fog cooling system, fixed cooling spots can be eliminated, a steam film is scattered, and uniform distribution of the temperature of thin strip steel in the width direction is achieved.

Description

Technical Field

[0001] This invention relates to the field of metal rolling technology, specifically to a hot-rolled strip steel aerosol cooling system. Background Technology

[0002] Post-rolling controlled cooling of strip steel is a crucial process connecting rolling and coiling. Its cooling rate and temperature uniformity directly determine the microstructure, mechanical properties, and shape quality of the strip steel. Currently, the mainstream cooling methods for strip steel include laminar flow cooling, aerosol cooling, and ultra-fast cooling. Laminar flow cooling sprays cooling water onto the high-temperature strip steel surface through coarse and fine manifolds, forming a laminar water curtain for heat exchange. Aerosol cooling uses compressed air to atomize cooling water into extremely fine droplets, which are then accelerated and sprayed onto the strip steel surface. It has higher cooling intensity, smaller droplets, and theoretically better uniformity than laminar flow cooling. Ultra-fast cooling, as a cutting-edge technology, uses extremely high water flow velocity and special nozzle design to remove a large amount of heat in a very short time (seconds) to meet the requirements of next-generation high-strength steel.

[0003] The current industry trend is to produce higher-strength, thinner, and more advanced high-strength special steels with specific applications through thin strip rolling technology. These steels are extremely sensitive to the precision of cooling path control, and the requirements for the uniformity of mechanical properties along the length and width of the strip are becoming increasingly stringent, which has become a bottleneck restricting product quality improvement. Currently, the commonly used cooling method for thin strips is to create fixed, discrete impact zones on the strip surface using fixed aerosol nozzles. Due to the "edge effect," the edges of the strip dissipate heat faster, and the water from the fixed nozzles tends to accumulate or splash at the edges, leading to uneven cooling between the edges and the center of the strip. Thin strip steel has poor rigidity and is extremely sensitive to temperature gradients. Even a small transverse temperature difference can trigger huge thermal stresses, resulting in severe edge waviness, center waviness, and warping problems that are difficult to eliminate in subsequent processes.

[0004] Impurities and hardness ions in the cooling water can easily cause nozzle clogging or scaling, altering the spray pattern and disrupting cooling uniformity. To ensure quality, frequent shutdowns are necessary for nozzle inspection and cleaning. Thin strip production lines have extremely high stability requirements. Frequent shutdowns for maintenance severely restrict production capacity, increase production costs, and each shutdown and restart generates a large number of defective products. Summary of the Invention

[0005] To address the problem of unsatisfactory existing aerosol cooling effects, this invention provides an aerosol cooling system for hot-rolled strip steel. This system eliminates fixed cooling spots and disperses the vapor film by reciprocating the aerosol nozzles along the width of the strip steel, achieving a uniform temperature distribution along the width of the strip steel and flexibly adapting to various production methods.

[0006] The technical solution adopted by the embodiments of the present invention to solve its technical problem is as follows:

[0007] A hot-rolled strip steel aerosol cooling system, comprising:

[0008] The aerosol nozzle array comprises an upper nozzle assembly and a lower nozzle assembly. The upper nozzle assembly is located above the hot-rolled strip, and the lower nozzle assembly is located below the hot-rolled strip. The upper nozzle assembly contains multiple upper nozzle groups, which are spaced apart along the running direction of the hot-rolled strip. Each upper nozzle group contains multiple upper aerosol nozzles, which are spaced apart along the width direction of the hot-rolled strip, with the spray direction of the upper aerosol nozzles pointing downwards. The lower nozzle assembly contains multiple lower nozzle groups, which are also spaced apart along the running direction of the hot-rolled strip. Each lower nozzle group contains multiple lower aerosol nozzles, which are also spaced apart along the width direction of the hot-rolled strip, with the spray direction of the lower aerosol nozzles pointing upwards.

[0009] The lifting control system can independently move each upper nozzle group and each lower nozzle group up and down;

[0010] The translation control system can independently move each upper nozzle group and each lower nozzle group back and forth along the width direction of the hot-rolled strip.

[0011] The gas supply system is capable of supplying gas to both the upper nozzle assembly and the lower nozzle assembly;

[0012] The water supply system is capable of supplying cooling water to both the upper and lower nozzle assemblies.

[0013] The beneficial effects of the embodiments of the present invention are:

[0014] 1. The reciprocating motion of the nozzle transforms the originally concentrated cooling impact zone into a uniform cooling band, completely eliminating the lateral temperature unevenness and long water marks caused by the fixed impact point, and significantly improving the shape and performance consistency of the strip steel.

[0015] 2. The reciprocating nozzles continuously disturb the steam layer on the surface of the strip, periodically sweeping away the stable steam film, so that the aerosol medium can continuously and directly impact the surface of the strip.

[0016] 3. By optimizing the model and control system, different cooling modes can be flexibly set in real time for different products and different operating conditions, and the horizontal cooling curve can be dynamically optimized. Attached Figure Description

[0017] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0018] Figure 1This is a schematic diagram of the working state of the hot-rolled strip air mist cooling system described in this invention.

[0019] Figure 2 This is a left-side view of an upper nozzle assembly.

[0020] Figure 3 This is a front view schematic diagram of an upper nozzle assembly.

[0021] Figure 4 This is a top view schematic diagram of an upward translation control mechanism.

[0022] Figure 5 This is a left-side view of a lower nozzle assembly.

[0023] Figure 6 This is a front view schematic diagram of a lower nozzle assembly.

[0024] Figure 7 This is a schematic diagram of the intelligent control system.

[0025] Figure 8 This is a structural diagram of the data acquisition module.

[0026] Figure 9 This is a schematic diagram of the architecture of an intelligent control system.

[0027] Figure 10 This is a schematic diagram of the working process of the hot-rolled strip air mist cooling system described in this invention.

[0028] The annotations in the attached figures are explained as follows:

[0029] 1. Aerosol nozzle array; 2. Lifting control system; 3. Translation control system; 4. Air supply system; 5. Water supply system; 6. Intelligent control system; 7. Hot-rolled strip steel; 8. Frame;

[0030] 11. Upper nozzle assembly; 12. Lower nozzle assembly;

[0031] 21. Upward lifting control mechanism; 22. Downward lifting control mechanism;

[0032] 31. Upper translation control mechanism; 32. Lower translation control mechanism;

[0033] 41. Upper main air pipe; 42. Air supply hose; 43. Air inlet pipe; 44. Lower main air pipe;

[0034] 51. Main water pipe; 52. Water supply hose; 53. Inlet water pipe; 54. Main water pipe;

[0035] 61. Data Acquisition Module; 62. Data Processing and Management Module; 63. Method Management Module; 64. Multi-Objective Real-Time Optimization Module; 65. Adaptive Learning Module; 66. Cooling System Control Module; 67. Central Processing Module;

[0036] 71. Rolling mill; 72. Pre-coiling pinch roll; 73. Coiling machine;

[0037] 81. Bracket;

[0038] 111. Upper nozzle assembly; 112. Upper aerosol nozzle; 113. Upper mixing block;

[0039] 121. Lower nozzle assembly; 122. Lower aerosol nozzle; 123. Lower mixing block;

[0040] 211. Screw jack; 212. Transmission rod; 213. Second servo motor;

[0041] 311. Long slider; 312. Connecting rod; 313. Ball screw; 314. First servo motor; 315. Slide rail;

[0042] 611. Data interface for rolling line system connection; 612. Temperature measurement module after rolling mill; 613. Temperature measurement module before coiling; 614. Pressure and flow monitoring module for gas supply pipeline; 615. Pressure and flow monitoring module for water supply pipeline. Detailed Implementation

[0043] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0044] For ease of understanding and description, the following description of the present invention uses absolute positional relationships. Unless otherwise specified, the directional term "above" indicates... Figure 1 The direction above, the directional word "down" indicates Figure 1 The lower side of the middle, the directional word "left" indicates Figure 1 The left side of the direction, the directional word "right" indicates Figure 1 The right-hand direction in the text, the directional word "front" indicates perpendicular to. Figure 1 The direction of the paper and the direction pointing inwards; the directional word "back" indicates perpendicular to. Figure 1 The orientation of the paper is pointed outwards from the viewpoint of the reader or user. This invention is described from the perspective of the reader or user, but the aforementioned directional terms should not be construed as limiting the scope of protection of this invention. Regarding the material, weight, size, angle, and parameters of the components, those skilled in the art can determine or replace them according to actual needs or a limited number of experiments.

[0045] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 As shown, the hot-rolled strip air mist cooling system described in this embodiment includes:

[0046] The aerosol nozzle array 1 comprises an upper nozzle assembly 11 and a lower nozzle assembly 12. The upper nozzle assembly 11 is located above the hot-rolled strip 7, and the lower nozzle assembly 12 is located below the hot-rolled strip 7. The upper nozzle assembly 11 contains multiple upper nozzle groups 111, which are arranged at intervals along the running direction A of the hot-rolled strip 7. Each upper nozzle group 111 contains multiple upper aerosol nozzles 112, which are arranged at intervals along the width direction B of the hot-rolled strip 7. The spray direction of the aerosol nozzle 112 is downward; the lower nozzle assembly 12 contains multiple lower nozzle groups 121, and the multiple (5-13) lower nozzle groups 121 are also arranged at intervals along the running direction A of the hot-rolled strip 7. Each lower nozzle group 121 contains multiple lower aerosol nozzles 122, and the multiple lower aerosol nozzles 122 are also arranged at intervals along the width direction B of the hot-rolled strip 7. The spray direction of the lower aerosol nozzles 122 is upward; both the upper aerosol nozzle 112 and the lower aerosol nozzles 122 can spray aerosol onto the hot-rolled strip 7.

[0047] The lifting control system 2 is capable of independently moving each upper nozzle group 111 and each lower nozzle group 121 up and down;

[0048] The translation control system 3 is capable of independently reciprocating each upper nozzle group 111 and each lower nozzle group 121 along the width direction of the hot-rolled strip 7;

[0049] Gas supply system 4 is capable of supplying gas to the upper nozzle assembly 11 and the lower nozzle assembly 12;

[0050] The water supply system 5 is capable of supplying cooling water to the upper nozzle assembly 11 and the lower nozzle assembly 12.

[0051] The mechanical structure of the hot-rolled strip aerosol cooling system is installed in the roller table area between the exit of the hot-rolled finishing mill (i.e., mill 71) and the coiling machine 73. The hot-rolled strip aerosol cooling system includes a frame 8, on which a bracket 81 is fixedly connected. An aerosol nozzle array 1, a translation control system 3, and a lifting control system 2 are sequentially installed and fixed on the bracket 81.

[0052] like Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6As shown, the frame 8 is a rigid welded frame, which is firmly fixed to the equipment foundation by anchor bolts. The upper and lower crossbeams of the frame are respectively welded with sturdy brackets 81, which are used to support the entire nozzle array, lifting control system, air supply system, water supply system, etc.

[0053] The specifications and height of the upper aerosol nozzles 112 in each upper nozzle group 111 are all the same; the number and spacing of the upper aerosol nozzles 112 in each upper nozzle group 111 are also the same, and the spacing between two adjacent upper aerosol nozzles 112 in each upper nozzle group 111 ranges from 50mm to 550mm. The spray coverage width of each upper nozzle group 111 is larger than the maximum width of the thin plate that the matching rolling mill can produce.

[0054] like Figure 2 , Figure 3 As shown, the upper nozzle assembly 111 also includes multiple upper mixing blocks 113. The upper aerosol nozzles 112 and the upper mixing blocks 113 are connected one-to-one. The gas supplied by the air supply system 4 and the cooling water supplied by the water supply system 5 can be mixed in the upper mixing blocks 113 before being sprayed out from the upper aerosol nozzles 112. Each upper mixing block 113 is provided with a vortex chamber that causes the gas and water flow to swirl.

[0055] The translation control system 3 contains multiple upper translation control mechanisms 31, each corresponding to an upper nozzle assembly 111. Each upper translation control mechanism 31 contains a long slider 311, a connecting rod 312, a ball screw 313, and a first servo motor 314 connected in sequence. A slide rail 315 is connected to the lower part of the long slider 311. Both the long slider 311 and the slide rail 315 extend along the width direction of the hot-rolled strip 7. The first servo motor 314 is fixed to the slide rail 315. In one upper translation control mechanism 31, two long sliders 311 are arranged at intervals along the running direction of the hot-rolled strip 7. Multiple upper mixing blocks 113 in one upper nozzle assembly 11 are fixed between two long sliders 311. The first servo motor 314 can drive the long slider 311, the upper mixing blocks 113, and the upper aerosol nozzles 112 to synchronously perform continuous, uniform, or variable speed reciprocating motions along the width direction of the hot-rolled strip 7 within a preset stroke.

[0056] When the control system commands the adjustment of the position of the entire row of nozzles in the width direction of the thin strip steel, the first servo motor 314 starts, driving the entire row of long sliders and the mixing block fixed on the long sliders to make precise reciprocating linear motion along the slide rail through the ball screw pair and connecting rod. The aerosol nozzles fixed on the mixing block also move accordingly. The stroke range that the ball screw 313 can drive is 50mm-800mm.

[0057] The lifting control system 2 contains multiple lifting control mechanisms 21, each corresponding to an upper nozzle group 111. Each lifting control mechanism 21 contains a screw jack 211, a transmission rod 212, and a second servo motor 213 connected in sequence. In one lifting control mechanism 21, a slide rail 315 can be connected and fixed vertically to the screws of two screw jacks 211. The second servo motor 213 can drive the long slider 311, slide rail 315, upper mixing block 113, and upper aerosol nozzle 112 to move up and down synchronously.

[0058] like Figure 2 , Figure 3 , Figure 4 As shown, slide rail 315 is a high-precision linear guide rail, and long slider 311 is a slider that matches the linear guide rail. The second servo motor 213 is connected to a transmission rod running through the left and right sides via a coupling. The transmission rod 212 drives multiple screw jacks 211 to rotate synchronously via a worm gear or bevel gearbox. The lifting control system 2 is also equipped with a linear guide mechanism (such as a guide column / guide sleeve) to ensure smooth lifting.

[0059] The lifting control system 2 can raise and lower the upper nozzle group 111 within a range of 80mm–800mm from the height of the thin plate (hot-rolled strip 7); the lifting control system 2 can raise and lower the lower nozzle group 121 within a range of 50mm–500mm from the height of the thin plate (hot-rolled strip 7). When the control system commands a height adjustment, the second servo motor 213 starts, driving the entire row of nozzles to rise and fall via a transmission rod, precisely optimizing the distance between the nozzles and the surface of the thin strip.

[0060] like Figure 2 , Figure 3 As shown, the air supply system 4 contains multiple upper main air pipes 41, each corresponding one-to-one with an upper nozzle assembly 111. The upper main air pipes 41 extend along the width of the hot-rolled strip 7 and are connected to an upper mixing block 113 via air supply hoses 42, each corresponding one-to-one with an upper mixing block 113. Multiple air inlet pipes 43 are externally connected to the upper main air pipes 41. Pressure regulating valves are installed on the air inlet pipes 43. The air supply system 4 also includes an air supply control device for controlling the pressure and flow rate of the supplied air. The flexible high-pressure air supply hose 42 is a metal braided hose with quick-connect fittings.

[0061] The water supply system 5 includes multiple upper main water pipes 51, each corresponding one-to-one with an upper nozzle assembly 111. The upper main water pipes 51 extend along the width of the hot-rolled strip 7. Each upper main water pipe 51 is connected to an upper mixing block 113 via a water supply hose 52, which also corresponds one-to-one with the upper mixing block 113. Multiple inlet pipes 53 are externally connected to the water supply hoses 52. Pressure regulating valves are installed on the inlet pipes 53. The water supply system 5 also includes a water supply control device for controlling the pressure and flow rate of the water supply. The flexible high-pressure water supply hose 52 is also a metal braided hose and has quick-connect fittings.

[0062] The flow area of ​​the upper main air pipe 41 is greater than the sum of the flow areas of the air supply hoses 42 connected to it, and the flow area of ​​the upper main air pipe 41 is less than the sum of the flow areas of the air inlet pipes 43 connected to it. The flow area of ​​the upper main water pipe 51 is greater than the sum of the flow areas of the water supply hoses 52 connected to it, and the flow area of ​​the upper main water pipe 51 is less than the sum of the flow areas of the water inlet pipes 53 connected to it.

[0063] like Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 As shown, the upper nozzle group 111 moves up and down independently in the same way as the lower nozzle group 121 moves up and down independently; the upper nozzle group 111 moves back and forth along the width direction of the hot-rolled strip 7 independently in the same way as the lower nozzle group 121 moves back and forth along the width direction of the hot-rolled strip 7.

[0064] The lower nozzle assembly 121 also includes multiple lower mixing blocks 123. The lower aerosol nozzles 122 and the lower mixing blocks 123 are connected one-to-one. The gas supplied by the air supply system 4 and the cooling water supplied by the water supply system 5 can be mixed in the lower mixing blocks 123 and then sprayed out from the lower aerosol nozzles 122. Each lower mixing block 123 is provided with a vortex chamber that causes the gas and water flow to swirl.

[0065] The translation control system 3 also includes multiple lower translation control mechanisms 32, which correspond one-to-one with the lower nozzle group 121. The structure of the lower translation control mechanism 32 is the same as that of the upper translation control mechanism 31. The lower translation control mechanism 32 can drive the lower mixing block 123 and the lower aerosol nozzle 122 to reciprocate along the width direction of the hot-rolled strip 7.

[0066] The lifting control system 2 also includes multiple lower lifting control mechanisms 22, each of which corresponds to a lower nozzle group 121. The structure of the lower lifting control mechanism 22 is the same as that of the upper lifting control mechanism 21. The lower lifting control mechanism 22 can drive the lower mixing block 123 and the lower aerosol nozzle 122 to move up and down.

[0067] The air supply system 4 also includes multiple lower main air pipes 44, each corresponding to a lower nozzle group 121. The connection method between the lower main air pipes 44 and the lower nozzle group 121 is the same as the connection method between the upper main air pipes 41 and the upper nozzle group 111.

[0068] The water supply system 5 also includes multiple lower main water pipes 54, each corresponding to a lower nozzle group 121. The connection method between the lower main water pipes 54 and the lower nozzle group 121 is the same as the connection method between the upper main water pipes 51 and the upper nozzle group 111.

[0069] The upper nozzle assembly 11 and the lower nozzle assembly 12 have basically the same structure. The connection methods between the upper nozzle assembly 11 and the upper lifting control mechanism 21 and the upper translation control mechanism 31 are basically the same as those between the lower nozzle assembly 12 and the lower lifting control mechanism 22 and the lower translation control mechanism 32. The connection methods between the upper nozzle assembly 11 and the air supply system 4 and the water supply system 5 are also basically the same as those between the lower nozzle assembly 12 and the air supply system 4 and the water supply system 5. To prevent the long slider 311 of the lower translation control mechanism 32 from disengaging from the slide rail 315, the cross-section of the long slider 311 can be a T-shaped structure, and the cross-section of the groove inside the slide rail 315 can also be a T-shaped structure.

[0070] The specifications and height of the lower aerosol nozzles 122 in each lower nozzle group 121 are all the same; the number and spacing of the lower aerosol nozzles 122 in each lower nozzle group 121 are also the same, and the spacing between two adjacent lower aerosol nozzles 122 in each lower nozzle group 121 ranges from 50mm to 550mm. The spray coverage width of each lower nozzle group 121 is larger than the maximum width of the thin plate that the matching rolling mill can produce.

[0071] All upper nozzle groups 111 reciprocate along the width direction of the hot-rolled strip 7 with the same period, and all lower nozzle groups 121 reciprocate along the width direction of the hot-rolled strip 7 with the same period. The reciprocating movements of any two adjacent upper nozzle groups 111 along the width direction of the hot-rolled strip 7 have the same first fixed phase difference, and the reciprocating movements of any two adjacent lower nozzle groups 121 along the width direction of the hot-rolled strip 7 have the same second fixed phase difference. The first fixed phase difference multiplied by the number of upper nozzle groups 111 equals the reciprocating motion cycle of one upper nozzle group 111, and the second fixed phase difference multiplied by the number of lower nozzle groups 121 equals the reciprocating motion cycle of one lower nozzle group 121.

[0072] The width direction of the hot-rolled strip 7 is parallel to the front-to-back direction. When the upper nozzle group 111 moves to the front limit position, the mist sprayed by the upper nozzle group 111 cannot cover the rear end of the upper surface of the hot-rolled strip 7 directly below the upper nozzle group 111. When the upper nozzle group 111 moves to the rear limit position, the mist sprayed by the upper nozzle group 111 cannot cover the front end of the upper surface of the hot-rolled strip 7 directly below the upper nozzle group 111. When the lower nozzle group 121 moves to the front limit position, the mist sprayed by the lower nozzle group 121 cannot cover the rear end of the lower surface of the hot-rolled strip 7 directly above the lower nozzle group 121. When the lower nozzle group 121 moves to the rear limit position, the mist sprayed by the lower nozzle group 121 cannot cover the front end of the lower surface of the hot-rolled strip 7 directly above the lower nozzle group 121.

[0073] like Figure 7 , Figure 8 , Figure 9 , Figure 10 As shown, the hot-rolled strip air mist cooling system also includes an intelligent control system 6, which includes a data acquisition module 61, a data processing and management module 62, a method management module 63, a multi-objective real-time optimization module 64, an adaptive learning module 65, a cooling system control module 66, and a central processing module 67.

[0074] The data acquisition module 61 includes a data interface 611 connected to the rolling line system, a temperature measurement module 612 after the rolling mill, a temperature measurement module 613 before coiling, a pressure and flow monitoring module 614 for the gas supply pipeline, and a pressure and flow monitoring module 615 for the water supply pipeline. The data acquisition module 61 is used to collect and provide the central processing module 67 with data information such as steel grade data, casting speed, cross-sectional specifications, post-rolling temperature, pre-coiling temperature, pressure and flow of the gas supply pipeline, and pressure and flow of the water supply pipeline.

[0075] Along the running direction A of the hot-rolled strip 7, the post-mill temperature measurement module 612 is located between the mill 71 and the aerosol nozzle array 1, and the pre-coiling temperature measurement module 613 is located between the aerosol nozzle array 1 and the pre-coiling pinch roll 72. A coiling machine 73 is located downstream of the pre-coiling pinch roll 72. Both the post-mill temperature measurement module 612 and the pre-coiling temperature measurement module 613 are linear array infrared thermometers. Both modules can monitor the temperature in the width direction of the hot-rolled strip 7 in real time. The central processing module 67 sends the data information collected by the data acquisition module 61 to the data processing and management module 62. The data processing and management module 62 then filters, calibrates, and aligns the data information accordingly to form a reliable real-time dataset.

[0076] The method management module 63 stores the theoretical optimal cooling method curves (target final cooling temperature, cooling rate, etc.) for multiple steel grades and the benchmark settings (such as initial water-air ratio, initial reciprocating frequency) for multiple specifications of strip steel. The multi-objective real-time optimization module 64 has a built-in optimization control algorithm model. Based on the real-time dataset provided by the data processing and management module 62, it calculates the optimal control mode through the optimization control algorithm model and sends the operation command to the cooling system control module 66.

[0077] The adaptive learning module 65 uses the parameters in the method management module 63 as a benchmark and combines the historical data in the data processing and management module 62 to perform adaptive learning, continuously updating the optimization control algorithm model calculated by the multi-objective real-time optimization module 64.

[0078] The cooling system control module 66 includes a motion control module, an air supply control module, and a water supply control module. The motion control module can control the operation of the lifting control system 2 (the second servo motor 213) and the translation control system 3 (the first servo motor 314). The air supply control module can control the pressure and flow rate of the gas supplied by the air supply system 4. The water supply control module can control the pressure and flow rate of the cooling water supplied by the water supply system 5.

[0079] The working process of the hot-rolled strip aerosol cooling system is described below.

[0080] Before the thin strip steel (i.e. hot-rolled strip steel 7) enters, the data acquisition module 61 collects parameters such as steel grade parameters, drawing speed, and cross-sectional specifications. After preprocessing, the data is submitted to the multi-objective real-time optimization module 64 for preliminary calculation. The multi-objective real-time optimization module 64 combines real-time data and takes the average temperature within the range required by the steel grade production method and the transverse temperature difference ≤15℃ as the objectives. It performs high-speed calculations and generates a set of optimal setting instructions, setting the equipment height, generating the reciprocating motion speed curve, and setting the pressure and flow status of the air and water supply.

[0081] After receiving the command, the cooling system control module 66 immediately drives the motion control module to control the first servo motor 314 to run according to the new speed curve, and can fine-tune the second servo motor 213 to change the height. At the same time, it drives the air supply control module and the water supply control module to adjust the main pipeline regulating valve to precisely control the water / air supply pressure and flow rate.

[0082] As the thin strip enters the cooling zone, the data acquisition module 61 collects the sheet drawing speed and temperature changes before and after cooling in real time. The multi-objective real-time optimization module 64 performs high-speed calculations based on the deviation between the real-time data and the target value, and then issues optimization instructions to the cooling system control module 66 to control and adjust the entire cooling system in real time.

[0083] The data processing and management module 62 records the data of each cooling process and result (temperature after curling). The adaptive learning module 65 continuously performs adaptive learning based on the recorded historical data, optimizes the control algorithm, and adjusts the control parameters to make the system control more and more precise.

[0084] For the specific steel grade in this embodiment, each row of nozzles performs a uniform reciprocating motion with a certain phase difference. From the first row of nozzles (upper nozzle group 111 or lower nozzle group 121) to the last row of nozzles (upper nozzle group 111 or lower nozzle group 121) from left to right, the phase difference of the reciprocating motion of each row of nozzles is the same. This phase difference multiplied by the number of nozzle groups constitutes a reciprocating motion cycle.

[0085] The reciprocating motion amplitude of each row of nozzles is the same, and when the nozzle assembly reciprocates to the extreme positions at both ends, the spray range of the nozzle assembly will not cover the other end of the thin strip steel, thereby reducing the cooling time of the thin strip steel edge and reducing the phenomenon of edge overcooling.

[0086] After rolling and before coiling, the linear infrared thermometer continuously measures the transverse temperature of the thin strip steel before and after cooling. Based on the real-time changes in the transverse temperature of the thin strip steel after rolling and before coiling, the multi-objective real-time optimization module 64 will fine-tune the reciprocating motion curve of the nozzle combination, thereby accurately controlling the cooling of the thin strip steel.

[0087] In another embodiment of the present invention, for a specific steel grade, the first row of nozzles is fixed at a certain position at one end of the reciprocating motion, the second row of nozzles is fixed at a symmetrical position at the other end of the reciprocating motion, and the other rows of nozzles perform reciprocating motions in the same phase, thereby meeting the production method requirements of the specific steel grade.

[0088] The core of this invention lies in the deep integration of mechanical innovation and intelligent control, which has created a dynamic, adaptive, and high-precision thin strip steel aerosol cooling system.

[0089] First, there's the composite motion mechanism of "lifting + reciprocating." Vertically, a servo motor drives a screw jack, allowing for overall adjustment of the distance between the entire nozzle array and the strip surface, accommodating strips of varying thicknesses and shapes. Another servo motor drives a ball screw pair, causing the entire row of nozzles to perform continuous, controllable reciprocating motion along the strip width. This completely eliminates fixed cold spots and lateral temperature unevenness caused by fixed nozzles, ensuring extremely uniform cooling from a physical perspective. Long sliders and connecting rods rigidly connect multiple hybrid blocks in the same row into a single unit. Only one servo motor is needed to drive the entire row's high-precision synchronous motion, resulting in a simple and reliable structure that avoids the problem of asynchronous multi-drive systems.

[0090] Then comes the intelligent control with multi-objective real-time optimization and self-learning. The multi-objective real-time optimization module receives full-width temperature field data provided by the linear infrared thermal imager. It does not only control the average temperature, but also dynamically calculates and adjusts the reciprocating speed curves and medium flow of each row of nozzles with cooling intensity and lateral uniformity as optimization objectives. The system has a built-in adaptive learning algorithm that can continuously record the method parameters and results of each cooling operation. By comparing with the theoretical model, it continuously self-corrects and optimizes the control algorithm, enabling the system to accumulate experience and become more and more accurate with use, ultimately achieving the goal of precise control.

[0091] The above description is merely a specific embodiment of the present invention and should not be construed as limiting the scope of the invention. Therefore, substitutions of equivalent components, or equivalent changes and modifications made within the scope of protection of the present invention, should still fall within the scope of the present invention. Furthermore, the technical features, technical solutions, and embodiments of the present invention can be freely combined and used.

Claims

1. A hot-rolled strip steel aerosol cooling system, characterized in that, The hot-rolled strip air mist cooling system includes: An aerosol nozzle array (1) comprises an upper nozzle assembly (11) and a lower nozzle assembly (12). The upper nozzle assembly (11) is located above the hot-rolled strip (7), and the lower nozzle assembly (12) is located below the hot-rolled strip (7). The upper nozzle assembly (11) comprises multiple upper nozzle groups (111), which are spaced apart along the running direction of the hot-rolled strip (7). Each upper nozzle group (111) comprises multiple upper aerosol nozzles (112). The upper aerosol nozzles (112) are arranged at intervals along the width direction of the hot-rolled strip (7), and the spray direction of the upper aerosol nozzles (112) is downward; the lower nozzle assembly (12) contains multiple lower nozzle groups (121), and the multiple lower nozzle groups (121) are also arranged at intervals along the running direction of the hot-rolled strip (7). Each lower nozzle group (121) contains multiple lower aerosol nozzles (122), and the multiple lower aerosol nozzles (122) are also arranged at intervals along the width direction of the hot-rolled strip (7), and the spray direction of the lower aerosol nozzles (122) is upward; The lifting control system (2) is capable of independently moving each upper nozzle group (111) and each lower nozzle group (121) up and down; The translation control system (3) is capable of independently reciprocating each upper nozzle group (111) and each lower nozzle group (121) along the width direction of the hot-rolled strip (7); The gas supply system (4) is capable of supplying gas to the upper nozzle assembly (11) and the lower nozzle assembly (12); The water supply system (5) is capable of supplying cooling water to the upper nozzle assembly (11) and the lower nozzle assembly (12).

2. The hot-rolled strip steel aerosol cooling system according to claim 1, characterized in that, The upper nozzle assembly (111) also contains multiple upper mixing blocks (113). The upper aerosol nozzles (112) and the upper mixing blocks (113) are connected one-to-one. The gas supplied by the gas supply system (4) and the cooling water supplied by the water supply system (5) can be mixed in the upper mixing blocks (113) and then sprayed out from the upper aerosol nozzles (112).

3. The hot-rolled strip steel aerosol cooling system according to claim 2, characterized in that, The translation control system (3) contains multiple upper translation control mechanisms (31), each of which corresponds to an upper nozzle group (111). Each upper translation control mechanism (31) contains a long slider (311), a connecting rod (312), a ball screw (313), and a first servo motor (314) connected in sequence. The lower part of the long slider (311) is connected to a slide rail (315). Both the long slider (311) and the slide rail (315) extend along the width direction of the hot-rolled strip (7). The two long sliders (311) are arranged at intervals along the running direction of the hot-rolled strip (7). The upper mixing block (113) is fixed between the two long sliders (311). The first servo motor (314) can drive the upper mixing block (113) and the upper aerosol nozzle (112) to move back and forth along the width direction of the hot-rolled strip (7).

4. The hot-rolled strip steel aerosol cooling system according to claim 3, characterized in that, The lifting control system (2) contains multiple lifting control mechanisms (21), each of which corresponds to an upper nozzle group (111). The lifting control mechanism (21) contains a screw jack (211), a transmission rod (212), and a second servo motor (213) connected in sequence. The slide rail (315) is fixedly connected to the screw of the screw jack (211) vertically. The second servo motor (213) can drive the upper mixing block (113) and the upper aerosol nozzle (112) to move up and down.

5. The hot-rolled strip steel aerosol cooling system according to claim 4, characterized in that, The gas supply system (4) contains multiple upper main gas pipes (41), each corresponding to an upper nozzle group (111). The upper main gas pipes (41) extend along the width direction of the hot-rolled strip (7). The upper main gas pipes (41) are connected to the upper mixing block (113) through gas supply hoses (42), each corresponding to an upper mixing block (113). Multiple air inlet pipes (43) are connected to the outside of the upper main gas pipes (41). The water supply system (5) contains multiple upper main water pipes (51), each corresponding to an upper nozzle group (111). The upper main water pipes (51) extend along the width direction of the hot-rolled strip (7). The upper main water pipes (51) are connected to the upper mixing block (113) through water supply hoses (52). Each water supply hose (52) corresponds to an upper mixing block (113). Multiple water inlet pipes (53) are connected to the outside of the water supply hoses (52).

6. The hot-rolled strip air mist cooling system according to claim 5, characterized in that, The flow area of ​​the upper main air pipe (41) is greater than the sum of the flow areas of the air supply hoses (42) connected to the upper main air pipe (41), and the flow area of ​​the upper main air pipe (41) is less than the sum of the flow areas of the air inlet pipes (43) connected to the upper main air pipe (41); the flow area of ​​the upper main water pipe (51) is greater than the sum of the flow areas of the water supply hoses (52) connected to the upper main water pipe (51), and the flow area of ​​the upper main water pipe (51) is less than the sum of the flow areas of the water inlet pipes (53) connected to the upper main water pipe (51).

7. The hot-rolled strip air mist cooling system according to claim 6, characterized in that, The lower nozzle assembly (121) also contains multiple lower mixing blocks (123). The lower aerosol nozzles (122) and the lower mixing blocks (123) are connected one-to-one. The gas supplied by the gas supply system (4) and the cooling water supplied by the water supply system (5) can be mixed in the lower mixing blocks (123) and then sprayed out from the lower aerosol nozzles (122). The translation control system (3) also contains multiple lower translation control mechanisms (32), which correspond one-to-one with the lower nozzle group (121). The structure of the lower translation control mechanism (32) is the same as that of the upper translation control mechanism (31). The lower translation control mechanism (32) can drive the lower mixing block (123) and the lower aerosol nozzle (122) to reciprocate along the width direction of the hot-rolled strip (7). The lifting control system (2) also contains multiple lower lifting control mechanisms (22). The lower lifting control mechanism (22) corresponds one-to-one with the lower nozzle group (121). The structure of the lower lifting control mechanism (22) is the same as that of the upper lifting control mechanism (21). The lower lifting control mechanism (22) can drive the lower mixing block (123) and the lower aerosol nozzle (122) to move up and down. The gas supply system (4) also contains multiple lower main gas pipes (44), and the connection method between the lower main gas pipe (44) and the lower nozzle group (121) is the same as the connection method between the upper main gas pipe (41) and the upper nozzle group (111). The water supply system (5) also includes multiple lower main water pipes (54), and the connection method between the lower main water pipes (54) and the lower nozzle group (121) is the same as the connection method between the upper main water pipes (51) and the upper nozzle group (111).

8. The hot-rolled strip air mist cooling system according to claim 1, characterized in that, All upper nozzle groups (111) have the same reciprocating cycle along the width direction of the hot-rolled strip (7), and all lower nozzle groups (121) have the same reciprocating cycle along the width direction of the hot-rolled strip (7). The reciprocating movements of any two adjacent upper nozzle groups (111) along the width direction of the hot-rolled strip (7) have a first fixed phase difference, and the reciprocating movements of any two adjacent lower nozzle groups (121) along the width direction of the hot-rolled strip (7) have a second fixed phase difference. The first fixed phase difference multiplied by the number of upper nozzle groups (111) equals the reciprocating cycle of one upper nozzle group (111), and the second fixed phase difference multiplied by the number of lower nozzle groups (121) equals the reciprocating cycle of one lower nozzle group (121).

9. The hot-rolled strip steel aerosol cooling system according to claim 1, characterized in that, The width direction of the hot-rolled strip (7) is parallel to the front-to-back direction; When the upper nozzle assembly (111) moves to the front limit position, the mist sprayed by the upper nozzle assembly (111) cannot cover the rear end of the upper surface of the hot-rolled strip (7) directly below the upper nozzle assembly (111); When the upper nozzle assembly (111) moves to the rear limit position, the mist sprayed by the upper nozzle assembly (111) cannot cover the front end of the upper surface of the hot-rolled strip (7) directly below the upper nozzle assembly (111); When the lower nozzle group (121) moves to the front limit position, the mist sprayed by the lower nozzle group (121) cannot cover the rear end of the lower surface of the hot-rolled strip (7) directly above the lower nozzle group (121); When the lower nozzle group (121) moves to the rear limit position, the mist sprayed by the lower nozzle group (121) cannot cover the front end of the lower surface of the hot-rolled strip (7) directly above the lower nozzle group (121).

10. The hot-rolled strip air mist cooling system according to claim 1, characterized in that, The hot-rolled strip air mist cooling system also includes an intelligent control system (6), which includes a data acquisition module (61), a data processing and management module (62), a method management module (63), a multi-objective real-time optimization module (64), an adaptive learning module (65), a cooling system control module (66), and a central processing module (67).

11. The hot-rolled strip air mist cooling system according to claim 10, characterized in that, The data acquisition module (61) includes a data interface (611) connected to the rolling line system, a temperature measurement module (612) after the rolling mill, a temperature measurement module (613) before coiling, a pressure and flow monitoring module (614) for the gas supply pipeline, and a pressure and flow monitoring module (615) for the water supply pipeline. The data acquisition module (61) is used to collect and provide the central processing module (67) with data information on steel grade, pulling speed, cross-sectional specifications, temperature after rolling, temperature before coiling, pressure and flow of the gas supply pipeline, and pressure and flow of the water supply pipeline.

12. The hot-rolled strip air mist cooling system according to claim 11, characterized in that, The temperature measurement module (612) after the rolling mill and the temperature measurement module (613) before coiling are both linear array infrared thermometers. Both the temperature measurement module (612) after the rolling mill and the temperature measurement module (613) before coiling can monitor the temperature in the width direction of the hot-rolled strip (7) in real time. The central processing module (67) sends the data information collected by the data acquisition module (61) to the data processing and management module (62). The data processing and management module (62) filters, calibrates and aligns the data information in time accordingly to form a real-time dataset.

13. The hot-rolled strip air mist cooling system according to claim 12, characterized in that, The method management module (63) stores the theoretical optimal cooling method curves for multiple steel grades and the benchmark setting values ​​for multiple specifications of strip steel; the multi-objective real-time optimization module (64) has a built-in optimization control algorithm model, which calculates the optimal control mode based on the real-time dataset provided by the data processing and management module (62) and sends operation instructions to the cooling system control module (66).

14. The hot-rolled strip air mist cooling system according to claim 13, characterized in that, The adaptive learning module (65) uses the parameters in the method management module (63) as a benchmark and combines the historical data in the data processing and management module (62) to perform adaptive learning, and continuously updates the optimization control algorithm of the multi-objective real-time optimization module (64).

15. The hot-rolled strip air mist cooling system according to claim 10, characterized in that, The cooling system control module (66) includes a motion control module, an air supply control module and a water supply control module. The motion control module can control the operation of the lifting control system (2) and the translation control system (3). The air supply control module can control the pressure and flow rate of the gas supplied by the air supply system (4). The water supply control module can control the pressure and flow rate of the cooling water supplied by the water supply system (5).

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