Method and device for purging a cold rolled steel sheet

Abstract

The application provides a kind of purging method and purging device of cold steel plate, belongs to the technical field of purging of cooling water on steel plate.Purging device includes air blowing device for blowing compressed air and wind blowing device for blowing ordinary air, the outlet of air blowing device and wind blowing device is arranged above cooling conveying roller way.Purging method includes: when the cooling temperature of steel plate conveyed on cooling conveying roller way is less than 680 DEG C, then open air blowing device, and make compressed air to the upper surface of steel plate blow.When the cooling temperature of steel plate conveyed on cooling conveying roller way is not less than 680 DEG C, then open wind blowing device, and make ordinary air to the upper surface of steel plate blow.The method can determine the blowing mode of air according to the cooling condition of steel plate, to reduce the use of compressed air, reduce the blowing cost of steel plate.

Description

Technical Field

[0001] This application relates to the field of purging cooling water on steel plates, and more specifically, to a purging method and purging device for cooled steel plates. Background Technology

[0002] In the production process of medium-thick steel plates (thickness 10-150mm), the controlled cooling system typically sprays water onto the steel plates to cool them. Due to the large surface area of ​​the steel plates, water may accumulate on the surface after cooling. Therefore, a purging device is needed to blow away the accumulated water and clean the surface of the steel plates.

[0003] Existing purging devices typically use compressed air to purge water from steel plates, which consumes a large amount of compressed air and results in high purging costs. Summary of the Invention

[0004] The inventors observed that after the steel plates cooled, some steel plates had a lot of cooling water accumulated, requiring compressed air to blow it away; while other steel plates had less cooling water accumulated, and the cooling water could be blown away without compressed air.

[0005] Therefore, the purpose of this application is to provide a purging method and purging device for cooled steel plates, which can determine the purging method of air according to the cooling status of the steel plate, so as to reduce the use of compressed air and reduce the purging cost of steel plates.

[0006] Firstly, this application provides a method for purging cooled steel plates, applicable to a purging device used in conjunction with a cooling conveyor roller conveyor. The purging device includes an air-blowing device for blowing compressed air and a wind-blowing device for blowing ordinary air. The outlets of both the air-blowing and wind-blowing devices are located above the cooling conveyor roller conveyor. The purging method includes: when the cooled temperature of the steel plate conveyed on the cooling conveyor roller conveyor is less than 680°C, the air-blowing device is activated to blow compressed air onto the upper surface of the steel plate. When the cooled temperature of the steel plate conveyed on the cooling conveyor roller conveyor is not less than 680°C, the wind-blowing device is activated to blow ordinary air onto the upper surface of the steel plate.

[0007] The inventors discovered that when the temperature of the steel plate after cooling is below 680℃, it indicates that a large amount of water was used during cooling, resulting in a correspondingly large amount of cooling water accumulation on the steel plate. Using compressed air to blow away this water can effectively remove it from the surface. Conversely, when the temperature of the steel plate after cooling is not lower than 680℃, it indicates that less water was used during cooling, resulting in a correspondingly smaller amount of cooling water accumulation. Using ordinary air (uncompressed air) to blow away this water can effectively remove it from the surface. By selecting the appropriate type of air for each situation, the amount of compressed air used can be reduced (current technology uses compressed air entirely for blowing), thus lowering the cost of blowing the steel plate.

[0008] In one possible implementation, the air blowing device includes a manifold located above the cooling conveyor rollers, with multiple air blowing ports on the manifold, the ports being inclined downwards and positioned above the cooling conveyor rollers; the air blowing device includes a bucket-shaped hood located to the side and above the cooling conveyor rollers, with the air inlets of the bucket-shaped hood inclined downwards. The blowing method includes: compressed air being obliquely blown onto the upper surface of the steel plate through the multiple air blowing ports, the flow direction of the compressed air on the upper surface of the steel plate being opposite to the conveying direction of the steel plate; or ordinary air being obliquely blown onto the upper surface of the steel plate through the air inlets.

[0009] Optionally, the angle between the projection of the air outlet axis onto the surface of the steel plate and the air outlet axis is 30-45°.

[0010] The manifold is equipped with multiple air nozzles, through which compressed air is blown to back-blown the steel plate, making it more effective at removing accumulated water. The air blown by the air blowing device is ordinary air, and the bucket-shaped hood design allows for a larger airflow from the nozzles, which is tilted downwards to overcome the tension between the water and the steel plate surface, thus effectively removing the water from the steel plate.

[0011] In one possible implementation, the extension direction of the manifold is consistent with the width of the steel plate conveyed on the cooling conveyor roller, and the distance between the axis of the manifold and the steel plate is 10-20cm.

[0012] When there is a lot of cooling water on the steel plate, during the steel plate conveying process, manifolds are set on the width of the steel plate and multiple air blowing ports are opened to blow the entire width of the steel plate. After the steel plate is conveyed from the cooling conveyor roller, the water on the steel plate is also blown away, and the blowing effect of the steel plate is better.

[0013] In one possible implementation, the angle between the projection of the axis of the vent of the funnel onto the surface of the steel plate and the axis of the vent is 4-8°, and the distance between the vent of the funnel and the steel plate is 10-20 cm. The purging method includes: the conveying speed of the steel plate is 30-150 m / min.

[0014] If the angle is greater than 8°, too much airflow is blown onto the plate surface near the fan, while too little airflow is blown away from the plate surface, resulting in water residue on the surface away from the plate. If the angle is less than 4°, too little airflow is blown onto the plate surface near the fan, while too much airflow is blown away from the plate surface, resulting in water residue on the surface near the steel plate. The coordination of the above angles and the running speed of the steel plate ensures that there is no water residue on the surface of the steel plate, while avoiding over-blowing and under-blowing.

[0015] In one possible implementation, the blowing device further includes an adjustment mechanism, which comprises a first support member, a second support member, and an adjustment member. The first support member is hinged to a first end of the funnel-shaped cover, one end of the second support member is hinged to a second end of the funnel-shaped cover, and the adjustment member is disposed on the second support member. The blowing method includes: adjusting the height of the hinge point between the second support member and the second end of the funnel-shaped cover using the adjustment member, thereby adjusting the included angle. Adjusting the specific angle of the funnel-shaped cover using the adjustment member is convenient and the structure is relatively simple.

[0016] In one possible implementation, the adjustment mechanism further includes a support plate, with one end of the first support member away from the funnel-shaped cover fixed to the support plate, and the adjustment member sleeved on the second support member, and the adjustment member being movable on the second support member to adjust the height of the hinge between the second support member and the second end of the funnel-shaped cover.

[0017] In one possible implementation, the purging device further includes a control device and a temperature sensor, with the control device electrically connected to the temperature sensor, the air-blowing device, and the wind-blowing device. The purging method includes: the temperature sensor monitoring the temperature of the steel plate conveyed on the cooling conveyor rollers to obtain first temperature information and sending it to the control device; after receiving the first temperature information, if the control device determines that the first temperature information is less than 680°C, the control device sends a first control signal to control the air-blowing device to turn on and the wind-blowing device to turn off. If, after receiving the first temperature information, the control device determines that the first temperature information is not less than 680°C, the control device sends a second control signal to control the air-blowing device to turn off and the wind-blowing device to turn on.

[0018] By using control devices and temperature sensors, the opening and closing of the air blowing device and the wind blowing device are automatically controlled, resulting in a higher degree of automation.

[0019] Secondly, this application provides a blowing device for cold steel plates, including an air blowing device for blowing out compressed air, a wind blowing device for blowing out ordinary air, and a control device. The control device is electrically connected to both the air blowing device and the wind blowing device. The outlets of both the air blowing device and the wind blowing device are located above the cooling conveyor rollers used for conveying the cold steel plates. The control device controls the air blowing device to be turned on or the wind blowing device to be turned on.

[0020] If there is a lot of cooling water accumulated on the steel plate, using an air blower to blow compressed air can effectively remove the water from the surface. If there is less cooling water accumulated on the steel plate, using a blower to blow ordinary air can also effectively remove the water from the surface. By selecting the appropriate type of air for each situation, the amount of compressed air used can be reduced, thus lowering the cost of purging the steel plate.

[0021] In one possible implementation, the air blowing device includes a hopper-shaped hood, a fan, and an adjusting mechanism. The fan is disposed inside the hopper-shaped hood, which is located above and to the side of the cooling conveyor rollers, with the air outlet of the hopper-shaped hood tilted downwards. The adjusting mechanism includes a first support member, a second support member, and an adjusting member. The first support member is hinged to a first end of the hopper-shaped hood, one end of the second support member is hinged to a second end of the hopper-shaped hood, and the adjusting member is disposed on the second support member to adjust the height of the second end of the hopper-shaped hood.

[0022] The specific angle of the funnel-shaped cover can be adjusted using the adjusting mechanism, making adjustment relatively convenient and the structure relatively simple.

[0023] In one possible implementation, the angle between the projection of the axis of the vent of the funnel onto the horizontal plane and the axis of the vent is 4-8°. This allows for more thorough cleaning of accumulated water on the steel plate.

[0024] The beneficial effects of the purging method and purging device for cooled steel plates provided in this application include:

[0025] When the steel plate cools to a temperature below 680℃, more water is used during cooling, resulting in more condensation on the plate. Using compressed air to blow away this condensation can effectively remove it. Conversely, when the steel plate cools to a temperature at least 680℃, less water is used, leading to less condensation. Using ordinary air to blow away this condensation is sufficient. By selecting the appropriate type of air for each situation, the amount of compressed air used can be reduced, thus lowering the cost of purging the steel plate.

[0026] Furthermore, the angle of the hopper-shaped cover is 4-8°. If the angle is greater than 8°, too much air is blown onto the plate surface near the fan and too little air is blown away from the plate surface, resulting in water residue on the plate surface. If the angle is less than 4°, too little air is blown onto the plate surface near the fan and too much air is blown away from the plate surface, resulting in water residue on the plate surface. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort and also fall within the protection scope of this application.

[0028] Figure 1 A schematic diagram of the structure of the blowing device for the cooled steel plate provided in the embodiments of this application;

[0029] Figure 2 A flowchart of a purging method for cooled steel plates provided in an embodiment of this application;

[0030] Figure 3 This is a schematic diagram of the structure of the air blowing device provided in the embodiment of this application.

[0031] Icons: 110-Cooling conveyor roller; 130-Air blowing device; 140-Air blowing device; 200-Steel plate; 131-Compressed air pipeline; 132-Manifold; 133-Air blowing port; 134-Pneumatic valve; 135-Manual valve; 141-Bucket-shaped cover; 150-Adjusting mechanism; 151-Support plate; 152-First support component; 153-Second support component; 154-Adjusting component; 155-Annular sleeve. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be described below with reference to the accompanying drawings.

[0033] Figure 1 A schematic diagram of the structure of the blowing device for the cooled steel plate provided in the embodiments of this application; Figure 2 A flowchart illustrating the purging method for cooled steel sheets provided in this application embodiment. Please refer to [link / reference]. Figure 1 and Figure 2 The purging device includes a control device (not shown), an air blowing device 130, and a wind blowing device 140, which are used in conjunction with the cooling conveyor roller 110. The outlets of both the air blowing device 130 and the wind blowing device 140 are located above the cooling conveyor roller 110 (above the steel plate 200 on the cooling conveyor roller 110). The control device controls the air blowing device 130 or the wind blowing device 140 to be turned on.

[0034] During the purging process of the cooled steel sheet 200, the cooled steel sheet 200 is typically conveyed on the cooling conveyor rollers 110 (see [link]). Figure 1The steel plate 200 is conveyed perpendicular to the paper (either inwards or outwards). The air blowing device 130 can blow compressed air to clean the steel plate 200, removing any accumulated water. The wind blowing device 140 can blow ordinary air (uncompressed air) to clean the steel plate 200, removing any accumulated water.

[0035] The situation needs to be discussed separately depending on whether the purging device blows out compressed air or ordinary air. When the temperature of the steel plate 200 conveyed on the cooling conveyor roller 110 after cooling is less than 680℃ (the cooling intensity of the steel plate 200 is high, a large amount of cooling water is sprayed on the steel plate 200, and there is a lot of water accumulation on the surface of the steel plate 200), the control device controls the air blowing device 130 to start, allowing compressed air to blow away the upper surface of the steel plate 200. When the temperature of the steel plate 200 conveyed on the cooling conveyor roller 110 after cooling is not less than 680℃ (the cooling intensity of the steel plate 200 is low, a relatively small amount of cooling water is sprayed on the steel plate 200, and there is less water accumulation on the surface of the steel plate 200), the control device controls the air blowing device 140 to start, allowing ordinary air to blow away the upper surface of the steel plate 200.

[0036] By selecting the appropriate type of air for different situations, the amount of compressed air used can be reduced (current technology uses compressed air for purging), thus lowering the purging cost of steel plate 200.

[0037] To better automate the blowing of the cooled steel plate 200, the blowing device also includes a temperature sensor (not shown in the figure; the temperature sensor is an existing temperature sensor that can withstand high temperatures). The temperature sensor is located at the inlet of the cooling conveyor roller 110. The control device is electrically connected to the temperature sensor, the air blowing device 130, and the wind blowing device 140.

[0038] Please continue reading. Figure 2 The purging method includes: a temperature sensor monitors the temperature of the steel plate 200 conveyed on the cooling conveyor roller 110, obtains first temperature information, and sends it to the control device; after receiving the first temperature information, if the control device determines that the first temperature information is less than 680°C, the control device sends a first control signal to control the air blowing device 130 to turn on and the wind blowing device 140 to turn off. After receiving the first temperature information, if the control device determines that the first temperature information is not less than 680°C, the control device sends a second control signal to control the air blowing device 130 to turn off and the wind blowing device 140 to turn on.

[0039] To improve the cleaning effect of the air blowing device 130 on the steel plate 200, the air blowing device 130 includes a compressed air pipeline 131 and a manifold 132 connected to the compressed air pipeline 131. A pneumatic valve 134 is installed on the compressed air pipeline 131. The manifold 132 is located above the cooling conveyor roller 110. Multiple air blowing ports 133 are provided on the manifold 132, and compressed air is blown out through the multiple air blowing ports 133 to clean the steel plate 200, so that the water accumulated on the steel plate 200 can be cleaned more thoroughly.

[0040] Optionally, the extension direction of the manifold 132 is consistent with the width of the steel plate 200 conveyed on the cooling conveyor roller 110. When there is a lot of cooling water accumulation on the steel plate 200, during the conveying process of the steel plate 200, manifolds 132 are provided on the width of the steel plate 200, and multiple air blowing ports 133 are evenly opened. The multiple air blowing ports 133 are inclined downward and located above the cooling conveyor roller 110. Compressed air is blown at an angle through the multiple air blowing ports 133 to sweep the upper surface of the steel plate 200, and the flow direction of the compressed air on the upper surface of the steel plate 200 is opposite to the conveying direction of the steel plate 200. This can back-blow the entire width of the steel plate 200. After the steel plate 200 is conveyed from the cooling conveyor roller 110, all the water accumulation on the steel plate 200 is also blown away, and the blowing effect of the steel plate 200 is better.

[0041] Optionally, the angle between the projection of the axis of the air outlet 133 onto the surface of the steel plate 200 and the axis of the air outlet 133 is 30-45°. For example, an inclination angle of 30°, 35°, 40° or 45° for the air outlet can improve the blowing effect of the air blowing device.

[0042] Furthermore, the distance between the axis of the manifold 132 and the steel plate 200 is 10-20cm. For example, the distance between the axis of the manifold 132 and the steel plate 200 is 10cm, 15cm, or 20cm. Maintaining a distance between the air outlet 133 and the steel plate 200 within this range allows for a larger coverage area of ​​the compressed air blown from the air outlet 133, while also ensuring sufficient blowing force, thereby balancing the blowing area and effect on the steel plate 200.

[0043] In this embodiment, a manual valve 135 is also provided on the compressed air pipeline 131. Compared to the pneumatic valve 134, the manual valve 135 is farther away from the manifold 132. Compressed air first passes through the manual valve 135, then through the pneumatic valve 134, and is discharged through the air outlet 133 of the manifold 132, thereby purifying the steel plate 200 with compressed air. When using the purging device, the manual valve 135 is first opened, and then the pneumatic valve 134 is opened or closed by the control device, which makes purging more convenient. When the purging device needs maintenance, the manual valve 135 is closed for maintenance.

[0044] To improve the cleaning effect of the air blowing device 140 on the steel plate 200, the air blowing device 140 includes a bucket-shaped hood 141 and a fan (e.g., an axial flow fan, not shown in the figure). The fan is disposed inside the bucket-shaped hood 141, which is located above and to the side of the cooling conveyor roller 110, with the air outlet of the bucket-shaped hood 141 tilted downwards. The air blown out by the air blowing device 140 is ordinary air. The bucket-shaped hood 141 allows for a larger air volume and a downward tilt, which can overcome the tension between the accumulated water and the surface of the steel plate 200, thereby cleaning the water off the steel plate 200.

[0045] Optionally, the angle α between the projection of the axis of the air outlet of the funnel-shaped cover 141 onto the surface of the steel plate 200 and the axis of the air outlet is 4-8°. As an example, the angle α between the axis of the air outlet of the funnel-shaped cover 141 and the steel plate 200 is 4°, 5°, 6°, 7°, or 8°. If the angle α is greater than 8°, the airflow to the plate surface near the fan is too large, and the airflow to the plate surface away from the fan is too small, resulting in water residue on the plate surface away from the fan. If the angle α is less than 4°, the airflow to the plate surface near the fan is too small, and the airflow to the plate surface away from the fan is too large, resulting in water residue on the plate surface near the steel plate 200.

[0046] Furthermore, the operating speed of the steel plate 200 during the conveying process is 30-150 m / min. For example, the operating speed of the steel plate 200 during the conveying process is 30 m / min, 50 m / min, 70 m / min, 90 m / min, 110 m / min, 130 m / min, or 150 m / min. Through the coordination of the above-mentioned included angle and the operating speed of the steel plate 200, water residue is eliminated from the surface of the steel plate 200, while minimizing airflow.

[0047] Furthermore, the distance between the air inlet of the funnel-shaped cover 141 and the steel plate 200 is 10-20cm. For example, the distance between the air inlet of the funnel-shaped cover 141 and the steel plate 200 is 10cm, 15cm, or 20cm. Maintaining the distance between the air inlet of the funnel-shaped cover 141 and the steel plate 200 within this range allows for a larger coverage area of ​​the ordinary air blown out by the air inlet, while also ensuring sufficient blowing force, thereby balancing the blowing area and effect on the steel plate 200.

[0048] Figure 3 This is a schematic diagram of the structure of the air blowing device 140 provided in an embodiment of this application. Please refer to... Figure 1 and Figure 3In order to adjust the tilt angle of the funnel-shaped cover 141, the air blowing device 140 also includes an adjustment mechanism 150. The adjustment mechanism 150 includes a support plate 151, a first support member 152, a second support member 153, and an adjustment member 154. The first support member 152 is hinged to the first end of the funnel-shaped cover 141, and the end of the first support member 152 away from the funnel-shaped cover 141 is fixed to the support plate 151. One end of the second support member 153 is hinged to the second end of the funnel-shaped cover 141. The adjustment member 154 is disposed on the second support member 153, and the adjustment member 154 is sleeved on the second support member 153. The adjustment member 154 can move on the second support member 153 to adjust the height of the hinge point between the second support member 153 and the second end of the funnel-shaped cover 141.

[0049] As shown in the figure, the second support member 153 is a threaded support rod, and an annular sleeve 155 is provided outside the threaded support rod. The adjusting member 154 is a nut, which is located below the annular sleeve 155. The annular sleeve 155 rests on the nut, and the outer wall of the annular sleeve 155 is hinged to the second end of the funnel-shaped cover 141. When it is necessary to adjust the angle of the funnel-shaped cover 141, the nut is rotated directly to adjust its height, thereby adjusting the height of the annular sleeve 155, which in turn adjusts the height of the hinge point between the second support member 153 and the second end of the funnel-shaped cover 141, thus adjusting the tilt angle of the funnel-shaped cover 141.

[0050] Please continue reading. Figure 1 In this embodiment, the hopper-shaped cover 141 and the compressed air pipeline 131 of the air blowing device 130 are respectively arranged on both sides of the cooling conveyor roller 110, and the air outlet of the hopper-shaped cover 141 is flush with the edge of the width of the steel plate 200 in the vertical direction. In other embodiments, the hopper-shaped cover 141 and the compressed air pipeline 131 of the air blowing device 130 may also be arranged on the same side of the cooling conveyor roller 110, which is not limited in this application.

[0051] Therefore, the purging method for cooled steel plates provided in this application includes:

[0052] After the steel plate 200 is cooled, it is conveyed to the cooling conveyor roller 110. When it passes the temperature sensor at the inlet of the cooling conveyor roller 110, the temperature sensor monitors the temperature of the steel plate 200 conveyed on the cooling conveyor roller 110, obtains the first temperature information, and sends it to the control device.

[0053] After receiving the first temperature information, the control device determines that the first temperature information is less than 680°C. The control device then sends a first control signal to open the pneumatic valve 134 on the compressed air pipeline 131 and shut down the blower of the air blowing device 140, so that compressed air can blow the upper surface of the steel plate 200 through the air blowing port 133.

[0054] After receiving the first temperature information, the control device determines that the first temperature information is not less than 680°C. Then, the control device sends a second control signal to close the pneumatic valve 134 on the compressed air pipeline 131 and turn on the fan of the air blowing device 140, so that ordinary air can be blown through the air outlet to the upper surface of the steel plate 200.

[0055] Furthermore, if the angle of the funnel-shaped cover 141 is not suitable, so that the ordinary air blown out of the funnel-shaped cover 141 cannot effectively clean the cooled steel plate 200, then rotate the nut on the second support member 153 (support threaded rod) to move the nut on the support threaded rod (up and down movement), and the annular sleeve 155 outside the support threaded rod moves up and down synchronously, thereby adjusting the height of the hinge between the support threaded rod and the second end of the funnel-shaped cover 141, thereby adjusting the tilt angle of the funnel-shaped cover 141 to 4-8°.

[0056] The beneficial effects of the blowing device and blowing method for cooled steel plates provided in this application include:

[0057] (1) By selecting the appropriate type of air for different situations, the amount of compressed air used can be reduced, thus lowering the purging cost of the 200mm steel plate. Compressed air at 50Nm... 3 Based on the usage per minute, after the medium and heavy plate production line is equipped with this purging device, the compressed air usage can be increased from the original 12m³ / min. 3 / ton reduced to the current 8m 3 The effect of reducing purging costs by / ton is very significant compared to the power consumption of the blower.

[0058] Furthermore, the angle of the bucket-shaped cover 141 is 4-8°. The ordinary air blown out from the bucket-shaped cover 141 is inclined and the air volume is concentrated, which can overcome the tension between the water and the surface of the steel plate 200, thereby cleaning the water on the steel plate 200.

[0059] The above description is only a part of the embodiments of this application and is not intended to limit this application. For those skilled in the art, this application can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A method for purging cooling water from a cooled steel plate, characterized in that, A purging device suitable for use with a cooling conveyor roller conveyor, the purging device comprising an air-blowing device for blowing compressed air and a wind-blowing device for blowing ordinary air, the outlets of the air-blowing device and the wind-blowing device being located above the cooling conveyor roller conveyor; the air-blowing device comprising a manifold located above the cooling conveyor roller conveyor, the manifold having multiple air-blowing ports arranged at an angle downwards and located above the cooling conveyor roller conveyor; the wind-blowing device comprising a bucket-shaped hood located to the side and above the cooling conveyor roller conveyor, the air outlet of the bucket-shaped hood being angled downwards; the angle between the projection of the axis of the air outlet of the bucket-shaped hood onto the surface of the steel plate and the axis of the air outlet is 4-8°, the distance between the air outlet of the bucket-shaped hood and the steel plate is 10-20cm; the cooling water purging method includes: The conveying speed of the steel plate is 30-150 m / min; When the temperature of the steel plate conveyed on the cooling conveyor roller is less than 680°C after cooling, the air blowing device is turned on to blow the cooling water accumulated on the upper surface of the steel plate with compressed air. The compressed air blows the cooling water accumulated on the upper surface of the steel plate at an angle through multiple air blowing ports, and the flow direction of the compressed air on the upper surface of the steel plate is opposite to the conveying direction of the steel plate. When the temperature of the steel plate conveyed on the cooling conveyor rollers is not less than 680°C after cooling, the air blowing device is turned on to allow ordinary air to blow away the cooling water accumulated on the upper surface of the steel plate; ordinary air is blown at an angle through the air outlet to sweep away the cooling water accumulated on the upper surface of the steel plate; the extension direction of the manifold is consistent with the width of the steel plate conveyed on the cooling conveyor rollers, and the distance between the axis of the manifold and the steel plate is 10-20 cm; The air blowing device further includes an adjustment mechanism, which includes a first support member, a second support member, and an adjustment member. The first support member is hinged to a first end of the funnel-shaped cover, one end of the second support member is hinged to a second end of the funnel-shaped cover, and the adjustment member is disposed on the second support member. The cooling water purging method includes: the adjusting member adjusting the height of the hinge joint between the second support member and the second end of the funnel-shaped cover, thereby adjusting the size of the included angle; the adjusting mechanism further includes a support plate, the end of the first support member away from the funnel-shaped cover is fixed to the support plate, the adjusting member is sleeved on the second support member, and the adjusting member is movable on the second support member to adjust the height of the hinge joint between the second support member and the second end of the funnel-shaped cover.

2. The cooling water purging method according to claim 1, characterized in that, The purging device further includes a control device and a temperature sensor. The control device is electrically connected to the temperature sensor, the air-blowing device, and the wind-blowing device. The purging method includes: The temperature sensor monitors the temperature of the steel plate conveyed on the cooling conveyor rollers, obtains the first temperature information, and sends it to the control device. After receiving the first temperature information, when the control device determines that the first temperature information is less than 680°C, the control device sends a first control signal to control the air blowing device to turn on and the wind blowing device to turn off. After receiving the first temperature information, when the control device determines that the first temperature information is not less than 680°C, the control device sends a second control signal to control the air blowing device to turn off and the wind blowing device to turn on.

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