A hot-rolled strip surface water vapor blowing device

Abstract

The utility model discloses a hot-rolled strip steel surface water vapor blowing device belongs to hot-rolled strip steel processing equipment technical field, and the device includes the blowing assembly of installation on the cooling roll way, the main gas pipe of being linked with blowing assembly and electric control system. Blowing assembly includes upper and lower blowing unit and left and right blowing unit, and upper and lower blowing unit includes upper blowing branch pipe and lower blowing branch pipe, and left and right blowing unit includes left blowing branch pipe and right blowing branch pipe, and each branch pipe is equipped with the shower head. The main gas pipe is linked with each blowing branch pipe through the connecting pipe, and is equipped with the gate valve, pneumatic ball valve and manual ball valve. Electric control system can realize the manual and automatic mode control of pneumatic ball valve. The utility model realizes the comprehensive removal of strip steel surface water vapor through four -way blowing structure, and cooperates the nimble control mode, and effectively solved the problem of water vapor removal not thorough, low detection accuracy, high energy consumption in the prior art, is applicable to the surface treatment process after the fine rolling of hot-rolled strip steel.

Description

Technical Field

[0001] This utility model relates to the technical field of hot-rolled strip steel processing equipment, and in particular to a water vapor purging device for the surface of hot-rolled strip steel. Background Technology

[0002] During the hot-rolled strip steel production process, after the strip is rolled by the finishing mill stand, a large amount of moisture easily adheres to the surface of the strip. To ensure the quality of the strip steel, surface quality inspection instruments need to be used to detect surface defects after the exit of the last finishing mill stand. However, the residual moisture on the surface can seriously interfere with the signal acquisition of the inspection instruments, resulting in large deviations in the inspection results and making it impossible to accurately identify defects such as cracks and spots on the strip steel surface. At the same time, if the residual moisture is not removed in time, it may also form local oxidation marks during the strip cooling process, affecting the appearance and mechanical properties of the finished strip steel.

[0003] Currently, the industry mostly uses simple single-sided or double-sided air-blowing structures to address this type of moisture problem. These structures can only purge localized areas of the strip, failing to achieve full surface coverage and resulting in poor purging effectiveness. Furthermore, existing equipment lacks a precise control mechanism, typically remaining in a continuously operating state. This not only wastes compressed air and increases production energy consumption but also lacks manual / automatic switching capabilities, making it difficult to adapt to different rolling rhythms or maintenance conditions. Consequently, it cannot effectively solve the problems of incomplete moisture removal from the strip surface, low detection accuracy, and high energy consumption. Utility Model Content

[0004] This invention proposes a surface moisture removal device for hot-rolled strip steel. While efficiently removing moisture from the surface of the strip steel, it enables switching between manual and automatic control modes, reducing air consumption and equipment maintenance costs, ensuring the accuracy of surface quality detection and the quality of finished strip steel, and solving the problems of incomplete removal of surface moisture, low surface quality detection accuracy, and poor control flexibility in the prior art after finishing hot-rolled strip steel.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A surface moisture purging device for hot-rolled strip steel includes a purging assembly installed on a cooling roller conveyor, a main air pipe connected to the purging assembly, and an electrical control system. The purging assembly includes upper and lower purging units and left and right purging units, which are spaced apart. The upper and lower purging units include an upper purging branch pipe and a lower purging branch pipe, horizontally positioned above and below the roller conveyor surface, respectively. The length direction of both the upper and lower purging branch pipes is parallel to the width direction of the cooling roller conveyor. The upper purging branch pipe has a plurality of downward-sloping upper nozzles evenly distributed, and the lower purging branch pipe has a plurality of upward-sloping lower nozzles evenly distributed, with the lower nozzles below the conveyor surface of the cooling roller conveyor. Both the upper and lower nozzles face the hot rolling mill. The direction in which the strip is conveyed is at an angle of 45° to the horizontal direction; the left and right blowing units include a left blowing branch pipe and a right blowing branch pipe that are horizontally arranged and located on the left and right sides of the roller conveyor surface, respectively. The length direction of the left and right blowing branch pipes is parallel to the length direction of the cooling roller conveyor; the left and right blowing branch pipes are staggered along the conveying direction of the cooling roller conveyor and are respectively provided with a number of left nozzles and a number of right nozzles; the left and right nozzles are horizontally arranged and are flush with the upper surface of the hot-rolled strip when it is conveyed to the cooling roller conveyor. One end of the main air pipe is connected to the compressed air pipeline of the hot rolling mill, and the other end is equipped with four manual ball valves at intervals. The four manual ball valves are connected to the upper purging branch pipe, the lower purging branch pipe, the left purging branch pipe, and the right purging branch pipe respectively through four independently set connecting pipes. Gate valves and pneumatic ball valves are installed at intervals on the main air pipe. The pneumatic ball valves are located between the gate valves and the four manual ball valves. The pneumatic ball valves are electrically connected to the electrical control system. The electrical control system has a pneumatic ball valve control mode selection button for selecting the pneumatic ball valve switch control mode as manual mode or automatic mode.

[0006] Furthermore, vertical plates are provided on both the left and right sides of the top of the cooling roller conveyor, and the length direction of the vertical plates is parallel to the conveying direction of the roller conveyor; the upper purging branch pipe is installed across the top of the two vertical plates, and the lower purging branch pipe is installed on the frame of the cooling roller conveyor and located below the area between two adjacent rollers; the left purging branch pipe and the right purging branch pipe are respectively installed on the two vertical plates, and several left nozzles and several right nozzles are respectively inserted through the two vertical plates.

[0007] Furthermore, the left and right blowing units are closer to the feed inlet of the cooling roller conveyor than the up and down blowing units.

[0008] Furthermore, the purging assembly also includes an upright baffle that is installed across the top of the two upright plates and located on one side of the upper purging branch pipe. The baffle is closer to the feed port of the cooling roller conveyor than the upper purging branch pipe.

[0009] Furthermore, the baffle is located directly above the lower purge branch pipe, and the horizontal projection distance between the lower purge branch pipe and the upper purge branch pipe is 200-300mm.

[0010] Furthermore, the bottom edge of the baffle is a straight edge with a length of 1000-1200mm, the left and right sides are straight edges perpendicular to the bottom edge with a length of 300-400mm, the top edge is an arc edge connected to the two sides with an arc of 50-60 degrees, and the thickness of the baffle is 20-40mm.

[0011] Furthermore, the nominal diameter of the main air tube is 90-110mm, the nominal diameter of the upper purge branch, the lower purge branch, the left purge branch, and the right purge branch are all 40-60mm, the length of the upper and lower purge branch is 1000-1200mm, and the length of the left and right purge branch is 300-400mm.

[0012] Furthermore, the connecting pipe is a flexible metal tube with a nominal diameter of 20-30mm.

[0013] Furthermore, the number of upper nozzles is the same as the number of lower nozzles, both being 6-10, and the number of left nozzles is the same as the number of right nozzles, both being 3-5.

[0014] Furthermore, the electrical control system includes a PLC controller, a digital output module, an intermediate relay, a switching power supply, and a host computer; the PLC controller is electrically connected to the digital output module, the digital output module is electrically connected to the coil terminal of the intermediate relay, the switching power supply is electrically connected to the power supply terminal of the intermediate relay, and the contact terminal of the intermediate relay is electrically connected to the solenoid valve on the pneumatic ball valve; the host computer is communicatively connected to the PLC and has a control mode selection button for the pneumatic ball valve.

[0015] By adopting the above technical solution, this utility model has the following beneficial effects: 1. This utility model, by setting up a four-directional blowing structure with upper and lower blowing units and left and right blowing units, can carry out all-round coverage blowing of the strip steel surface. It first removes the water vapor on the left and right sides, laying the foundation for the deep blowing of the upper and lower blowing units. It forms a progressive blowing logic of "side first, then upper and lower", which improves the overall water vapor removal efficiency. Compared with the traditional single-sided or double-sided blowing method, it significantly improves the water vapor removal effect and ensures the cleanliness of the strip steel surface.

[0016] 2. By setting up a baffle, this utility model can not only protect the upper purging branch pipe when the steel strip head is raised, preventing the steel strip head from directly impacting and damaging the purging assembly, but also prevent water vapor from spreading to the surrounding area during the purging process, thus preventing water vapor from adhering to the surface of the steel strip again.

[0017] 3. This utility model realizes the switching between manual and automatic modes of the pneumatic ball valve through the electronic control system, which can be flexibly adjusted according to different rolling rhythms or maintenance conditions, thereby improving the adaptability and ease of operation of the device.

[0018] 4. When the present invention adopts the automatic control mode, it can accurately control the opening and closing of the pneumatic ball valve according to the conveying status of the strip (such as the strip biting and strip throwing signals), avoid the device being open for a long time, effectively reduce the waste of compressed air, and reduce production energy consumption.

[0019] 5. This utility model has an independent manual ball valve between the main air pipe and each purging branch pipe, which can control the on / off of each branch individually. This makes it easy to adjust the purging intensity according to the water vapor conditions at different locations, and also facilitates the inspection and maintenance of individual branches, thus reducing equipment maintenance costs.

[0020] 6. This utility model eliminates signal interference to subsequent surface quality testing instruments by efficiently removing moisture from the strip steel surface, thereby improving testing accuracy. At the same time, it avoids oxidation defects on the strip steel surface caused by residual moisture, ensuring the appearance and mechanical properties of the finished strip steel product. Attached Figure Description

[0021] Figure 1 This is a perspective view of the water vapor purging device for the surface of hot-rolled strip steel proposed in Embodiment 1 of this utility model; Figure 2 This is a front view of the water vapor purging device for the surface of hot-rolled strip steel proposed in Embodiment 1 of this utility model; Figure 3 This is a top view of the water vapor purging device for the surface of hot-rolled strip steel proposed in Embodiment 1 of this utility model; Figure 4 This is a wiring diagram of the electrical control system proposed in Embodiment 1 of this utility model; Figure 5 This is a schematic diagram of the PLC program programming for the electrical control system proposed in Embodiment 1 of this utility model; Figure 6 This is a WinCC graphical editing schematic diagram of the electronic control system proposed in Embodiment 1 of this utility model; Figure 7 This is a schematic diagram of the electrical control process of the pneumatic ball valve proposed in Embodiment 1 of this utility model; Figure 8 This is a schematic diagram showing the location of the water vapor purging device on the surface of hot-rolled strip steel proposed in Embodiment 1 of this utility model.

[0022] The components in the attached diagram are labeled as follows: 1-Main air pipe, 2-Gate valve, 3-Pneumatic ball valve, 4-Cooling roller conveyor, 5-Vertical plate, 6-Upper purging branch pipe, 7-Lower purging branch pipe, 8-Left purging branch pipe, 9-Right purging branch pipe, 10-Upper nozzle, 11-Lower nozzle, 12-Left nozzle, 13-Right nozzle, 14-Manual ball valve, 15-Connecting pipe, 16-Baffle, 17-Feeding port, 18-Roller. Detailed Implementation

[0023] 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. Example 1

[0024] like Figure 1-3 As shown, a surface water vapor purging device for hot-rolled strip steel includes a purging assembly installed on a cooling roller conveyor 4, a main air pipe 1 connected to the purging assembly, and an electrical control system.

[0025] The purging assembly includes an upper and lower purging unit and a left and right purging unit, which are arranged alternately. The left and right purging unit is closer to the feed inlet 17 of the cooling roller conveyor 4 than the upper and lower purging unit. When the hot-rolled strip is conveyed on the cooling roller conveyor 4, it first passes through the left and right purging unit, and then through the upper and lower purging unit. This initial purging removes moisture from the left and right sides of the upper surface of the hot-rolled strip, laying the foundation for the subsequent deep purging by the upper and lower purging units, forming a progressive purging logic of "sides first, then top and bottom," thus improving the overall moisture removal efficiency.

[0026] The upper and lower purging units include an upper purging branch pipe 6 and a lower purging branch pipe 7, horizontally arranged above and below the conveying surface of the roller conveyor, respectively. The length direction of both the upper purging branch pipe 6 and the lower purging branch pipe 7 is parallel to the width direction of the cooling roller conveyor 4. The length of both the upper purging branch pipe 6 and the lower purging branch pipe 7 is 1000-1200 mm; in this embodiment, the length is 1100 mm. Several downward-sloping upper nozzles 10 are evenly distributed on the upper purging branch pipe 6, and several upward-sloping lower nozzles 11 are evenly distributed on the lower purging branch pipe 7. The lower nozzles 11 are lower than the conveying surface of the cooling roller conveyor 4. Both the upper nozzles 10 and the lower nozzles 11 face the direction from which the hot-rolled strip is conveyed, and the angle between them and the horizontal direction is 45°. The number of upper nozzles 10 and lower nozzles 11 is the same, 6-10 in each case; in this embodiment, the number is 8.

[0027] The left and right blowing units include a left blowing branch pipe 8 and a right blowing branch pipe 9, which are horizontally arranged and located on the left and right sides of the roller conveyor surface, respectively. The length direction of both the left and right blowing branch pipes 8 and 9 is parallel to the length direction of the cooling roller conveyor 4. The nominal diameter of the upper blowing branch pipe 6, the lower blowing branch pipe 7, the left blowing branch pipe 8, and the right blowing branch pipe 9 is 40-60mm. In this embodiment, the nominal diameter is 50mm.

[0028] The left and right purge branch pipes 8 and 9 are staggered along the conveying direction of the cooling roller conveyor 4, and each is equipped with a number of left nozzles 12 and a number of right nozzles 13. The lengths of both the left and right purge branch pipes 8 and 9 are 300-400 mm. The number of left nozzles 12 and right nozzles 13 is the same, 3-5 each. In this embodiment, the length of each is 360 mm, and there are 4 nozzles on each side. The left nozzles 12 and right nozzles 13 are horizontally arranged and flush with the upper surface of the hot-rolled strip when it is conveyed to the cooling roller conveyor 4. The nominal diameter of the left nozzle 12, right nozzle 13, upper nozzle 10, and lower nozzle 11 is 30 mm.

[0029] The cooling roller conveyor 4 has vertical plates 5 on both the left and right sides of its top, with the length of the vertical plates 5 parallel to the conveying direction of the roller conveyor. An upper purge branch pipe 6 is installed across the top of the two vertical plates 5, and a lower purge branch pipe 7 is installed on the frame of the cooling roller conveyor, located below the area between two adjacent rollers 18. A left purge branch pipe 8 and a right purge branch pipe 9 are respectively installed on the two vertical plates 5, and several left nozzles 12 and several right nozzles 13 pass through the two vertical plates 5.

[0030] The purging assembly also includes an upright baffle 16, which is horizontally mounted across the top of the two vertical plates 5 and located on one side of the upper purging branch pipe 6. The baffle 16 is closer to the feed inlet 17 of the cooling roller conveyor 4 than the upper purging branch pipe 6. Specifically, the baffle 16 is located directly above the lower purging branch pipe 7, and the horizontal projection distance between the lower purging branch pipe 7 and the upper purging branch pipe 6 is 200-300mm. In this embodiment, the distance is 250mm. The bottom edge of the baffle 16 is a straight edge with a length of 1000-1200mm. The left and right sides are straight edges, perpendicular to the bottom edge, with a length of 300-400mm. The top edge is an arc edge, connected to the two sides, with an arc of 50-60 degrees. The thickness of the baffle 16 is 20-40mm. In this embodiment, the bottom edge length of the baffle 16 is 1100mm, the side edge length is 360mm, the curvature of the top arc edge is 57°, and the overall thickness is 30mm. The baffle 16 not only protects the upper purging branch pipe 6 when the steel strip head is raised, preventing the steel strip head from directly impacting and damaging the purging assembly, but also prevents water vapor from diffusing to the surrounding area during the purging process, preventing water vapor from adhering to the surface of the steel strip again.

[0031] One end of the main air pipe 1 is connected to the compressed air pipeline of the hot rolling mill, and the other end is equipped with four manual ball valves 14 at intervals. The four manual ball valves 14 are connected to the upper purging branch pipe 6, the lower purging branch pipe 7, the left purging branch pipe 8, and the right purging branch pipe 9 respectively through four independently set connecting pipes 15. This utility model has four manual ball valves 14, which can control the on / off of each branch individually, making it convenient to adjust the purging intensity according to the water vapor conditions at different locations, and also facilitating the inspection and maintenance of individual branches, thus reducing equipment maintenance costs.

[0032] A gate valve 2 and a pneumatic ball valve 3 are spaced apart on the main air pipe 1. The pneumatic ball valve 3 is located between the gate valve 2 and four manual ball valves 14. The nominal diameter of the main air pipe 1 is 90-110 mm, and the connecting pipe 15 is a flexible metal tube with a nominal diameter of 20-30 mm. In this embodiment, the nominal diameter of the main air pipe 1 is 100 mm, the nominal diameter of the connecting pipe 15 is 25 mm, and the nominal diameter of the manual ball valves 14 is 32 mm.

[0033] The pneumatic ball valve 3 is electrically connected to the electrical control system, which has a control mode selection button for choosing between manual and automatic modes for the pneumatic ball valve 3. In this embodiment, the pneumatic ball valve 3 is DN100. Specifically, the electrical control system includes a PLC controller, a digital output module, an intermediate relay, a switching power supply, and a host computer. The PLC controller is electrically connected to the digital output module, the digital output module is electrically connected to the coil terminal of the intermediate relay, the switching power supply is electrically connected to the power supply terminal of the intermediate relay, and the contact terminal of the intermediate relay is electrically connected to the solenoid valve on the pneumatic ball valve 3. The host computer communicates with the PLC and has a control mode selection button for the pneumatic ball valve 3.

[0034] This invention enables manual and automatic switching of the pneumatic ball valve 3 through an electronic control system. This allows for flexible adjustment based on different rolling rhythms or maintenance conditions, improving the adaptability and ease of operation of the device. In automatic control mode, the opening and closing of the pneumatic ball valve 3 can be precisely controlled according to the strip conveying status (such as bite or throw signals), avoiding prolonged open operation, effectively reducing compressed air waste, and lowering production energy consumption.

[0035] like Figure 4 As shown, the solenoid valve electrical signal of pneumatic ball valve 3 is output from the digital output module (6ES7 322-1BL00-0AA0) of the winding PLC1517 substation MCD to terminals 13 and 14 of the coil of intermediate relay KA14 (MYJ2N-G). The V+ and V- of the switching power supply (DRP-240-24) are connected to terminals 5 and 8 of KA14, and terminals 9 and 12 of KA14 are connected to the + and - plugs of the solenoid valve of pneumatic ball valve 3.

[0036] like Figure 5-6 As shown, the control program is developed on a host computer (e.g., a PC) using PLC programming software (TIA Portal v18) and configuration software (Wincc Runtime V7.5+SP1). The output variable (O103.4) of the solenoid valve for the take-up roller air blowing and delay instructions are defined in the PLC program. A new DB data block is created to define intermediate variables, and ladder diagrams are used for programming. A button switch for the take-up roller air blowing control mode is added to the Wincc screen, representing on, off, and automatic modes. Each control mode uses the corresponding control variables within the PLC for program compilation, enabling the switching and normal operation of the two control modes.

[0037] A control mode for a surface water vapor purging device for hot-rolled strip steel is as follows: (1) Manual Start / Stop Mode. This mode is activated when the background color of the button turns green after clicking the "Manual Start" button on the WinCC operation screen. The control logic is: the hot-rolled strip surface air blowing device is turned on; this mode is activated when the background color of the button turns green after clicking the "Manual Stop" button on the WinCC operation screen. The control logic is: the hot-rolled strip surface water vapor purging device is turned off.

[0038] (2) Automatic Control Mode. This mode is activated when the background color of the automatic button on the WinCC operation screen turns green. The control logic is as follows: Figure 7 As shown: When either stand F1 or F2 bites the steel, the air blowing device on the surface of the hot-rolled strip will automatically start; 14 seconds after the F1 stand throws the steel (the control time can be adjusted according to actual needs), the water vapor blowing device on the surface of the hot-rolled strip will stop.

[0039] like Figure 8 As shown, F1 and F2 stands are the finishing mill equipment in the hot strip rolling production line. Currently, there are a total of 9 stands (F1-F9) in the finishing mill area. Assuming that the strip speed reaches 10m / s when passing the last stand (usually F9 stand), to prevent the air blowing device from failing to start in time due to the strip speed being too fast, the air blowing device is set to start when the strip bites into the F1 or F2 stand.

[0040] The "stick bite" signal is primarily determined by the change in rolling force during two states: when the stand is waiting for material and when the strip is passing through the stand. Specifically, the rolling force is very small when the stand is waiting for material, but increases dramatically the instant the strip passes through the stand, resulting in a significant spike in the rolling force transmitted through the main motor. The PLC program compares the rolling forces before and after this spike and outputs a "stick bite" signal. Similarly, the "stick rejection" signal is also determined by changes in rolling force.

[0041] In summary, this invention, through its four-directional blowing structure comprising upper and lower blowing units and left and right blowing units, enables omnidirectional coverage blowing of the strip surface. Compared to traditional single-sided or double-sided blowing methods, it significantly improves the moisture removal effect, ensuring the cleanliness of the strip surface. By efficiently removing moisture from the strip surface, this invention eliminates signal interference to subsequent surface quality testing instruments, improving testing accuracy. Simultaneously, it avoids oxidation defects on the strip surface caused by residual moisture, thus guaranteeing the appearance and mechanical properties of the finished strip product.

[0042] The above description is a detailed description of the preferred embodiments of the present utility model. However, the embodiments are not intended to limit the scope of the patent application of the present utility model. All equivalent changes or modifications made under the technical spirit of the present utility model should fall within the patent scope covered by the present utility model.

Claims

1. A device for purging water vapor from the surface of hot-rolled strip steel, characterized in that: This includes a purging assembly installed on the cooling roller conveyor, a main air pipe connected to the purging assembly, and an electrical control system; The purging assembly includes upper and lower purging units and left and right purging units, which are spaced apart. The upper and lower purging units include an upper purging branch pipe and a lower purging branch pipe, horizontally positioned above and below the roller conveyor surface, respectively. The length direction of both the upper and lower purging branch pipes is parallel to the width direction of the cooling roller conveyor. The upper purging branch pipe has a plurality of downward-sloping upper nozzles evenly distributed, and the lower purging branch pipe has a plurality of upward-sloping lower nozzles evenly distributed, with the lower nozzles below the conveyor surface of the cooling roller conveyor. Both the upper and lower nozzles face the hot rolling mill. The direction in which the strip is conveyed is at an angle of 45° to the horizontal direction; the left and right blowing units include a left blowing branch pipe and a right blowing branch pipe that are horizontally arranged and located on the left and right sides of the roller conveyor surface, respectively. The length direction of the left and right blowing branch pipes is parallel to the length direction of the cooling roller conveyor; the left and right blowing branch pipes are staggered along the conveying direction of the cooling roller conveyor and are respectively provided with a number of left nozzles and a number of right nozzles; the left and right nozzles are horizontally arranged and are flush with the upper surface of the hot-rolled strip when it is conveyed to the cooling roller conveyor. One end of the main air pipe is connected to the compressed air pipeline of the hot rolling mill, and the other end is equipped with four manual ball valves at intervals. The four manual ball valves are connected to the upper purging branch pipe, the lower purging branch pipe, the left purging branch pipe, and the right purging branch pipe respectively through four independently set connecting pipes. Gate valves and pneumatic ball valves are installed at intervals on the main air pipe. The pneumatic ball valves are located between the gate valves and the four manual ball valves. The pneumatic ball valves are electrically connected to the electrical control system. The electrical control system has a pneumatic ball valve control mode selection button for selecting the pneumatic ball valve switch control mode as manual mode or automatic mode.

2. The device for purging water vapor from the surface of hot-rolled strip steel according to claim 1, characterized in that: The cooling roller conveyor has vertical plates on both the left and right sides of its top, with the length of the vertical plates parallel to the conveying direction of the roller conveyor. The upper purging branch pipe is installed across the top of the two vertical plates, and the lower purging branch pipe is installed on the frame of the cooling roller conveyor and located below the area between two adjacent rollers. The left and right purging branch pipes are respectively installed on the two vertical plates, and several left nozzles and several right nozzles pass through the two vertical plates.

3. The device for purging water vapor from the surface of hot-rolled strip steel according to claim 2, characterized in that: The left and right blowing units are closer to the feed inlet of the cooling roller conveyor than the up and down blowing units.

4. The surface water vapor purging device for hot-rolled strip steel according to claim 3, characterized in that: The purging assembly also includes an upright baffle that is installed across the top of the two upright plates and is located on one side of the upper purging branch pipe. The baffle is closer to the feed port of the cooling roller conveyor than the upper purging branch pipe.

5. A surface water vapor purging device for hot-rolled strip steel according to claim 4, characterized in that: The baffle is located directly above the lower purge branch pipe, and the horizontal projection distance between the lower purge branch pipe and the upper purge branch pipe is 200-300mm.

6. The device for purging water vapor from the surface of hot-rolled strip steel according to claim 5, characterized in that: The bottom edge of the baffle is a straight edge with a length of 1000-1200mm. The left and right sides are also straight edges, perpendicular to the bottom edge, with a length of 300-400mm. The top edge is a rounded edge, connected to the two sides, with an arc of 50-60 degrees. The thickness of the baffle is 20-40mm.

7. The device for purging water vapor from the surface of hot-rolled strip steel according to claim 1, characterized in that: The nominal diameter of the main air tube is 90-110mm, the nominal diameter of the upper purge branch, the lower purge branch, the left purge branch, and the right purge branch is 40-60mm, the length of the upper and lower purge branch is 1000-1200mm, and the length of the left and right purge branch is 300-400mm.

8. The surface water vapor purging device for hot-rolled strip steel according to claim 1, characterized in that: The connecting pipe is a flexible metal tube with a nominal diameter of 20-30mm.

9. A surface water vapor purging device for hot-rolled strip steel according to claim 1, characterized in that: The number of upper nozzles is the same as the number of lower nozzles, both being 6-10, and the number of left nozzles is the same as the number of right nozzles, both being 3-5.

10. A surface water vapor purging device for hot-rolled strip steel according to claim 1, characterized in that: The electrical control system includes a PLC controller, a digital output module, an intermediate relay, a switching power supply, and a host computer. The PLC controller is electrically connected to the digital output module, the digital output module is electrically connected to the coil terminal of the intermediate relay, the switching power supply is electrically connected to the power supply terminal of the intermediate relay, and the contact terminal of the intermediate relay is electrically connected to the solenoid valve on the pneumatic ball valve. The host computer is communicatively connected to the PLC and has a control mode selection button for the pneumatic ball valve.

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