Anti-oxidation sealing device in production process of ternary eutectic alloy plated steel sheet

Abstract

The application discloses a kind of ternary eutectic alloy coating steel plate production process in anti-oxidation sealing device, including melting pot, gas knife is sequentially provided with nitrogen cooling box and movable cooling air box in the direction of strip steel conveying above melting pot, gas knife, nitrogen cooling box, movable cooling air box are connected with nitrogen source respectively by pipeline and are communicated, nitrogen cooling box is the open cylinder structure in upper portion and lower portion, and the side wall of nitrogen cooling box is provided with several air vents.This application is set to the upper portion, lower portion and side of nitrogen cooling box are provided with opening, when strip steel is in production state, nitrogen in its interior forms nitrogen protection cloud above melting pot, so that zinc-aluminum-magnesium coating is effectively isolated with air, play the role of anti-oxidation, while high-temperature waste heat in its interior can be naturally escaped through upper opening, lower opening and the air vent of side wall, effectively prevent the equipment structure deformation, internal electrical element damage and reduce the problem of strip steel cooling speed caused by high-temperature waste heat of airtight structure.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of alloy plated steel plate production, in particular to an anti-oxidation sealing device in the production process of ternary eutectic alloy plated steel plate. BACKGROUND

[0002] In recent years, zinc-aluminum-magnesium plated steel plate has been widely used, and compared with traditional hot-dip galvanizing, the change of the plating layer has caused great changes in the equipment of hot-dip plating line. In order to prevent the oxidation of the metal plating layer, an air knife and a box-type sealing cooling device are arranged above the melting pot, so that the strip steel after immersion plating in the melting pot is cooled in a sealed environment to avoid the oxidation of the zinc-aluminum-magnesium plating layer on the strip steel by contacting with air.

[0003] Although the sealing cooling device can play a certain anti-oxidation role in the production process of zinc-aluminum-magnesium plating, a large amount of residual heat remains in the box-type sealed structure and cannot escape, which has the following deficiencies:

[0004] (1) High-temperature residual heat easily causes deformation of the equipment structure;

[0005] (2) Various electrical elements in the sealing cooling device are easily damaged or misoperated due to long-term high-temperature effect;

[0006] (3) The size of zinc flowers on the plated strip steel surface greatly affects the product quality, and in order to produce zinc flower-free products and control the plating layer thickness, rapid cooling is required, but the residual heat in the box-type sealing structure above the air knife reduces the cooling speed of the strip steel. SUMMARY

[0007] In view of the above problems, the purpose of the present application is to provide an anti-oxidation sealing device in the production process of ternary eutectic alloy plated steel plate, so as to solve the problems of deformation of the equipment, damage or misoperation of the electrical elements due to overheating and low cooling speed of the strip steel caused by high-temperature residual heat in the existing sealing cooling device.

[0008] The present application is implemented as follows:

[0009] An anti-oxidation sealing device in the production process of ternary eutectic alloy plated steel plate, comprising a melting pot, an air knife, a nitrogen cooling box and a movable cooling air box are sequentially arranged above the melting pot along the conveying direction of the strip steel, the air knife and the nitrogen cooling box are fixedly connected and form a nitrogen protection cloud in the area from the top of the melting pot to the top of the nitrogen cooling box, the air knife, the nitrogen cooling box and the movable cooling air box are respectively connected with a nitrogen source through pipelines, the nitrogen cooling box is a cylindrical structure with the upper part and the lower part being open, and a plurality of ventilation openings are formed in the side wall of the nitrogen cooling box.

[0010] Further, the nitrogen cooling box is provided with a plurality of first nozzles, the plurality of first nozzles are arranged horizontally back-to-back on both sides of the strip steel, and outlet ends of the plurality of first nozzles are respectively directed to the inner walls of the corresponding sides of the nitrogen cooling box.

[0011] Further, the plurality of first nozzles are connected in communication with the nitrogen source through a first pipeline, and the first pipeline is provided with a flow meter and a control valve.

[0012] Further, the movable cooling air box is arranged above the nitrogen cooling box, the movable cooling air box is provided with a plurality of second nozzles at a lower part, a plurality of third nozzles at an upper part, and a plurality of fourth nozzles at a middle part.

[0013] Further, the plurality of second nozzles are arranged downwardly inclined, the plurality of third nozzles are arranged horizontally, and the plurality of fourth nozzles are arranged upwardly inclined.

[0014] Further, the plurality of second nozzles are connected in communication with the nitrogen source through a second pipeline, and the plurality of third nozzles and the plurality of fourth nozzles are connected in communication with an air source through a third pipeline.

[0015] Further, the second pipeline is provided with a flow meter and a control valve, and the third pipeline is provided with a first fan and a variable frequency motor.

[0016] Further, the air knives are connected in communication with the nitrogen source through a fourth pipeline and a fifth pipeline, and the fifth pipeline is provided with a second fan.

[0017] Further, a tower top deflection roller is arranged above the movable cooling air box, a plurality of cooling devices are further fixed between the movable cooling air box and the tower top deflection roller, and the tower top deflection roller is covered with an anti-scald non-woven fabric.

[0018] The beneficial effects of the present application are:

[0019] The nitrogen cooling box of the anti-oxidation sealing device in the production process of the ternary eutectic alloy plated steel plate is different from the past box type structure of the sealed cooling box, and the upper part, the lower part and the side surface are all provided with openings, when the production line is in the production state, the nitrogen in the inside forms a nitrogen protection cloud above the melting pot, so that the zinc-aluminum-magnesium plated layer is effectively isolated from the air, and the anti-oxidation effect is achieved, at the same time, the internal high-temperature residual heat can be naturally escaped through the upper opening, the lower opening and the ventilation opening of the side wall, effectively preventing the problems of equipment structure deformation, internal electrical element damage and reduction of strip steel cooling speed caused by high-temperature residual heat of the sealed structure, and no additional cooling device is needed; the plurality of second nozzles arranged in the lower part of the movable cooling air box spray nitrogen downwardly inclined, so that the nitrogen sprayed by the plurality of second nozzles can be connected with the nitrogen overflowing from the top of the nitrogen cooling box, further ensuring that the plated strip steel in this distance from the nitrogen cooling box to the movable cooling air box does not contact with the air, preventing partial oxidation of the zinc-aluminum-magnesium plated layer, and avoiding scratches and black spots on the surface of the strip steel. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a structural schematic diagram of the present application;

[0021] Figure 2 is a schematic diagram of the jet direction of each nozzle of the present application;

[0022] Figure 3 is a sectional view of the front view of the interior of the nitrogen cooling box of the present application;

[0023] Figure 4 is a sectional view of the top view of the interior of the nitrogen cooling box of the present application;

[0024] Figure 5 is a structural schematic diagram of the air knife, nitrogen cooling box of the present application.

[0025] BRIEF DESCRIPTION OF DRAWINGS

[0026] 1, melting pot; 2, air knife; 3, nitrogen cooling box; 31, first nozzle; 32, fixed frame; 33, sealing baffle; 4, moving cooling air box; 41, second nozzle; 42, third nozzle; 43, fourth nozzle; 5, top turning roller; 6, first pipeline; 7, second pipeline; 8, third pipeline; 9, first fan; 10, fourth pipeline; 11, fifth pipeline; 12, second fan; 13, sixth pipeline; 14, seventh pipeline; 15, gas storage tank; 16, strip steel. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. In the following description, a large number of specific details are set forth in order to fully understand the present application, but the present application can also be implemented in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0028] As Figures 1-2 shown is an anti-oxidation sealing device in the production process of the ternary eutectic alloy plated steel sheet of the present application, comprising a melting pot 1, an air knife 2, a nitrogen cooling box 3 and a moving cooling air box 4 are sequentially arranged from bottom to top along the vertical direction above the melting pot 1 along the conveying direction of the strip steel 16, the conveying direction of the strip steel 16 is shown by the arrow in Figure 1 , the air knife 2 and the nitrogen cooling box 3 are fixedly connected through an air knife frame (not shown in the figure) and form a nitrogen protection cloud in the area from the top of the melting pot 1 to the top of the nitrogen cooling box 3, the air knife 2, the nitrogen cooling box 3 and the moving cooling air box 4 are respectively connected with a nitrogen source through pipelines, the nitrogen cooling box 3 is a cylindrical structure with the upper part and the lower part being open, and a plurality of ventilation openings (not shown in the figure) are formed in the side wall of the nitrogen cooling box 3.

[0029] The gas knives 2 fixedly arranged on the top of the melting pot 1 control the thickness of the coating layer of the strip steel 16 after hot dipping from the melting pot 1 according to the production needs. The number of the gas knives 2 is two, and the two gas knives 2 are oppositely arranged on the two sides of the strip steel 16, and the closed area formed between the two gas knives 2 is for the strip steel 16 to pass through to avoid the oxidation reaction of the strip steel 16 after being dipped in zinc-aluminum-magnesium. Moreover, since the zinc-aluminum-magnesium is easy to be oxidized after being in contact with air, the gas knives 2 in the embodiment are connected with the nitrogen source through pipelines to prevent the coating of the strip steel 16 from being oxidized. Specifically, the gas knives 2 are connected with the nitrogen source through the fourth pipeline 10 and the fifth pipeline 11 respectively, and the fifth pipeline 11 is provided with the second fan 12. The fourth pipeline 10 and the fifth pipeline 11 are connected in parallel, and the control valves are arranged on the fourth pipeline 10 and the fifth pipeline 11, and the control valves on the fourth pipeline 10 and the fifth pipeline 11 are controlled respectively to make the gas knives 2 connected with the nitrogen source through the pipelines to directly supply the gas to the gas knives 2, or connected with the nitrogen source through the second fan 12 to make the second fan 12 supply the gas to the gas knives 2. The inlet ends of the fourth pipeline 10 and the fifth pipeline 11 are connected with the sixth pipeline 13, and the outlet ends are connected with the seventh pipeline 14, and the sixth pipeline 13 is sequentially provided with a pressure reducing valve, a gas storage tank 15 storing nitrogen, and a pressure stabilizing valve. It should be noted that the pipelines connected with the gas knives 2 are all provided with flow meters and pressure gauges (not shown in the figure) to adjust the jet flow and pressure of the gas knives 2, so as to better control the thickness of the coating layer.

[0030] The nitrogen cooling box 3 is used for cooling the strip steel 16 passing through the gas knives 2, and the nitrogen cooling box 3 is located above the gas knives 2 and forms a nitrogen protection cloud together with the gas knives 2 above the melting pot 1 to create a protective atmosphere to prevent oxidation after zinc-aluminum-magnesium plating. The gas knives 2 and the nitrogen cooling box 3 are fixedly connected through the gas knife holder, that is, the gas knives 2 are fixedly arranged on the gas knife holder, and the gas knife holder is fixedly connected with the nitrogen cooling box 3. The nitrogen cooling box 3 is a cylindrical structure with the upper part and the lower part being open, and the side wall of the nitrogen cooling box 3 is provided with a plurality of ventilation openings. The cross-sectional shape of the nitrogen cooling box 3 is an integral cavity structure of a rectangular shape, or can be a split structure and divided into an upper cavity structure and a lower cavity structure of a rectangular shape, such as Figure 1As shown, the upper cuboid cavity structure is defined as the upper nitrogen cooling box, and the lower cuboid cavity structure is defined as the lower nitrogen cooling box, wherein the lower nitrogen cooling box is fixedly connected with the air knife holder, and the upper nitrogen cooling box and the lower nitrogen cooling box are detachably assembled, facilitating the later disassembly. The plurality of first nozzles 31 arranged in the cuboid cavity of the upper nitrogen cooling box can be used as standby nozzles, and whether to open or not is selected according to the spraying requirements of the strip steel 16. Moreover, the nitrogen cooling box 3 is different from the past box type structure of the closed cooling box, and the upper part and the lower part are both provided with openings. The openings of the upper part and the lower part not only facilitate the strip steel 16 to pass through, but also facilitate the free escape of the high-temperature hot gas in the internal space, avoiding the internal space being in a high-temperature state for a long time. The plurality of ventilation openings (not shown in the figure) provided on the side surface of the nitrogen cooling box 3 further accelerate the escape of the internal high-temperature hot gas to the outside. When the strip steel 16 is in a production state, the internal residual heat of the nitrogen cooling box 3 can escape naturally through the upper opening, the lower opening and the ventilation openings of the side wall, effectively preventing the problems of equipment structure deformation, internal electrical element damage and reduction of the cooling speed of the strip steel 16 caused by the high-temperature residual heat of the closed structure. In this way, there is no need to additionally equip other cooling devices in the internal space, thereby saving costs. At the same time, the nitrogen gas in the internal space of the nitrogen cooling box 3 forms a nitrogen gas curtain, effectively isolating the zinc-aluminum-magnesium coating on the strip steel 16 passing through the internal space from the air, thereby playing a role in preventing oxidation.

[0031] As shown in Figure 3 , the nitrogen cooling box 3 is oppositely provided with a plurality of first nozzles 31. The plurality of first nozzles 31 are oppositely arranged on the left and right sides of the nitrogen cooling box 3. The plurality of first nozzles 31 are horizontally arranged back-to-back on the two sides of the strip steel 16. The outlet ends of the plurality of first nozzles 31 respectively face the inner walls of the corresponding sides of the nitrogen cooling box 3, so that the plurality of first nozzles 31 do not directly spray nitrogen gas to the surface of the strip steel 16, preventing the nitrogen gas flow from being too large to damage the un-solidified coating on the surface of the strip steel 16, and reducing the surface quality of the strip steel 16. Please refer to Figure 2 the spraying direction of the first nozzles 31, that is, the first nozzles 31 spray nitrogen gas back to the surface of the strip steel 16. The nitrogen gas sprayed from the outlet end of the first nozzles 31 is first sprayed to the inner wall of the nitrogen cooling box 3, and then reverses and moves towards the strip steel 16, so that the nitrogen gas fills the internal space of the nitrogen cooling box 3, and then cools the strip steel 16 passing through the nitrogen cooling box 3. The nitrogen gas sprayed by the first nozzles 31 does not directly face the front and back surfaces of the strip steel 16. The nitrogen gas sprayed to the inner wall of the nitrogen cooling box 3 moves in the nitrogen cooling box 3 and finally covers the entire nitrogen cooling box 3 to form a nitrogen protection cloud, preventing external air from entering the internal space.

[0032] As shown in Figure 3 and Figure 4As shown, multiple first nozzles 31 are mounted inside the nitrogen cooling box 3 via mounting brackets 32. The multiple first nozzles 31 on the mounting brackets 32 are arranged in a rectangular array and configured in multiple rows. Preferably, adjacent first nozzles 31 are of equal size and equidistant from each other, ensuring uniform spraying. Multiple mounting brackets 32 are used, positioned opposite each other on the left and right sides of the strip 16. The mounting brackets 32 can also be configured in multiple rows vertically. The specific number and position of the mounting brackets 32 and first nozzles 31 are designed according to actual production needs and are not limited here. The multiple first nozzles 31 spray nitrogen onto the inner wall of the nitrogen cooling box 3. Although not directly onto the surface of the strip 16, a nitrogen protective cloud is formed near the strip 16 to prevent oxidation of the zinc-aluminum-magnesium plating upon contact with air.

[0033] like Figure 5 As shown in this embodiment, a sealing baffle 33 is vertically slidably installed on the outside of the nitrogen cooling box 3. The sealing baffle 33 can move up and down along the nitrogen cooling box 3. The sealing baffle 33, the air knife 2, and the nitrogen cooling box 3 together enclose and form a nitrogen protective cloud above the melting pot 1, creating a protective atmosphere to prevent oxidation after zinc-aluminum-magnesium plating. During normal production, a narrow gap is formed between the bottom of the sealing baffle 33 and the top of the melting pot 1 to create a stable nitrogen protective atmosphere around the strip steel 16 above the melting pot 1. Moreover, the nitrogen gas sprayed from the air knife 2 flows outward to form a scavenging effect on the liquid surface, blowing the scum on the surface of the liquid in the melting pot 1 through the gap and away from the area around the strip steel 16. When it is necessary to observe the strip steel 16 and the zinc liquid around it, the sealing baffle 33 is slid upward to move it away from the top of the melting pot 1 and form an observation port between it and the top of the melting pot 1 to facilitate observation of the strip steel 16 and the zinc liquid below the air knife 2. The sealing baffle 33 is raised and lowered manually. It can use existing technologies such as screw lifting, ratchet lifting or other lifting methods, and there are no restrictions here.

[0034] In this embodiment, the first nozzle 31 is preferably a circular nozzle, but a slit nozzle or other shapes of nozzle can also be used; no limitation is made here. Multiple first nozzles 31 are connected to a nitrogen source via a first pipeline 6. The first pipeline 6 is equipped with a flow meter and a control valve to control the injection flow rate of the first nozzles 31. There are two sets of first pipelines 6, connected to the upper and lower parts of the nitrogen cooling box 3 respectively, allowing for separate control of nitrogen injection into the upper and lower parts of the nitrogen cooling box 3. The pressure inside the nitrogen cooling box 3 is approximately 0.5 MPa, and the flow rate of the first nozzles 31 can be adjusted according to production needs.

[0035] The mobile cooling air box 4 is used for re-cooling the plated strip steel 16 to reduce the temperature to the required temperature before entering the cooling tower. The mobile cooling air box 4 is slidingly arranged above the nitrogen cooling box 3. The crane above the nitrogen cooling box 3 is fixedly provided with a sliding track. The mobile cooling air box 4 is slidingly arranged on the sliding track of the crane to use one sliding track with the crane and reciprocally move along the length direction of the sliding track. After the production line is started, the mobile cooling air box 4 is moved above the nitrogen cooling box 3. When the production line is stopped for maintenance, the mobile cooling air box 4 is moved away, improving the convenience and flexibility of using the mobile cooling air box 4.

[0036] As shown in Figure 1 and Figure 2 , the lower part of the mobile cooling air box 4 is provided with a plurality of second nozzles 41, the upper part is provided with a plurality of third nozzles 42, and the middle part is provided with a plurality of fourth nozzles 43. The plurality of second nozzles 41, third nozzles 42 and fourth nozzles 43 are respectively arranged on the left and right sides of the strip steel 16, and the spraying direction is towards the surface of the strip steel 16, that is, the plurality of second nozzles 41, third nozzles 42 and fourth nozzles 43 arranged on the left and right sides of the strip steel 16 spray and cool the front and back of the strip steel 16 respectively. The plurality of second nozzles 41 are arranged downwardly inclined, the plurality of third nozzles 42 are arranged horizontally, and the plurality of fourth nozzles 43 are arranged upwardly inclined. The plurality of second nozzles 41 are communicated with the nitrogen source through the second pipeline 7, and the plurality of third nozzles 42 and the plurality of fourth nozzles 43 are communicated with the air source through the third pipeline 8. The second pipeline 7 is provided with a flow meter and a control valve, and the third pipeline 8 is provided with a first fan 9 and a variable frequency motor. The first fan 9 controls the flow rate through the variable frequency motor. As shown in Figure 2 , in this embodiment, the plurality of second nozzles 41 are arranged downwardly inclined, so that the nitrogen sprayed by the second nozzles 41 is sprayed downwardly inclined, and the inclination angle of the second nozzles 41 and the spraying range are determined according to the distance between the nitrogen cooling box 3 and the mobile cooling air box 4, so that the nitrogen sprayed by the second nozzles 41 can be connected with the nitrogen escaping from the top of the nitrogen cooling box 3, thereby ensuring that the strip steel 16 passing through the distance from the top of the nitrogen cooling box 3 to the bottom of the mobile cooling air box 4 does not contact with air, preventing the zinc-aluminum-magnesium coating from being oxidized and avoiding the generation of black spots on the surface of the strip steel 16. The fourth nozzles 43 are arranged upwardly inclined to prevent the air sprayed by the fourth nozzles 43 from entering the space of the nitrogen sprayed by the second nozzles 41, effectively avoiding the mixing between air and nitrogen. The third nozzles 42 are arranged horizontally and communicated with the air source, and the first fan 9 is used to blow and cool the surface of the strip steel 16.

[0037] The upper part of the moving cooling air box 4 is provided with a tower top deflection roller 5, and a plurality of cooling devices are fixed between the moving cooling air box 4 and the tower top deflection roller 5. The strip steel 16 is cooled by air cooling to the required temperature of the process, and then is conveyed to the tower top deflection roller 5. The outer periphery of the tower top deflection roller 5 is covered with an anti-scald non-woven fabric to prevent scratches and black spots caused by friction on the back of the product, thereby affecting the quality of the product.

[0038] The working process of the anti-oxidation sealing device in the production process of the ternary eutectic alloy plated steel plate of the present application is as follows: first, preparing zinc 80-94% by weight, aluminum 5-15% by weight, magnesium 1-5% by weight, silicon 0.1-0.3% by weight, and other elements containing doping; second, annealing furnace plate temperature control, wherein the open fire section is 600-700℃, the radiation section is 650-750℃, and the cooling section is 400-460℃, and the temperature of the melting pot 1 is 400-460℃; then, the strip steel 16 enters the melting pot 1 and performs hot-dip galvanizing aluminum magnesium operation, and during the upward conveying process of the strip steel 16 after immersion plating in the melting pot 1, nitrogen gas is blown to the strip steel 16 by the air knife 2 in sequence to control the thickness of the plated layer, and then the plated strip steel 16 is cooled again in the nitrogen gas cooling box 3, the plurality of first nozzles 31 in the nitrogen gas cooling box 3 do not directly spray nitrogen gas to the surface of the strip steel 16 to prevent the nitrogen gas flow from being too large to damage the un-solidified plated layer on the surface of the strip steel 16 and reduce the surface quality of the strip steel 16, but the plurality of first nozzles 31 form a nitrogen gas protection cloud around the strip steel 16 above the melting pot 1, effectively avoiding the oxidation of the zinc aluminum magnesium plated layer by contacting with air; the plated strip steel 16 after being cooled again in the nitrogen gas cooling box 3 enters the moving cooling box for further cooling, and the plurality of second nozzles 41 arranged at the lower part of the moving cooling box are inclined downward to spray nitrogen gas, so that the nitrogen gas sprayed by the plurality of second nozzles 41 is connected with the nitrogen gas overflowing from the top of the nitrogen gas cooling box 3, further ensuring that the plated strip steel 16 in the distance from the nitrogen gas cooling box 3 to the moving cooling air box 4 does not contact with air, preventing partial oxidation of the zinc aluminum magnesium plated layer, and avoiding the generation of black spots on the surface of the strip steel 16; then, the strip steel 16 is air blown to the surface by the plurality of third nozzles 42 and the plurality of fourth nozzles 43, is cooled again, and enters the cooling tower.

[0039] Although the present application discloses the preferred embodiments to achieve the above-mentioned purposes, it is not intended to limit the structural features of the present application, and any person skilled in the art should know that any changes or modifications easily thought of under the technical spirit of the present application are possible, and are all covered by the patent application scope of the present application.

Claims

1. An anti-oxidation sealing device in a production process of a ternary eutectic alloy plated steel sheet, characterized in that, The application relates to a strip steel cooling device, which comprises a melting pot (1), a gas knife (2), a nitrogen cooling box (3) and a movable cooling air box (4) arranged above the melting pot (1) along the conveying direction of a strip steel (16) in sequence, the gas knife (2) and the nitrogen cooling box (3) are fixedly connected and form a nitrogen protection cloud in the area from the top of the melting pot (1) to the top of the nitrogen cooling box (3), the gas knife (2), the nitrogen cooling box (3) and the movable cooling air box (4) are connected with a nitrogen source through pipelines respectively, the nitrogen cooling box (3) is a cylindrical structure with the upper part and the lower part being open, a plurality of ventilation openings are formed in the side wall of the nitrogen cooling box (3), a plurality of first nozzles (31) are arranged in the nitrogen cooling box (3), the plurality of first nozzles (31) are arranged horizontally and back to back on the two sides of the strip steel (16), and the outlet ends of the plurality of first nozzles (31) are respectively directed towards the inner walls of the corresponding sides of the nitrogen cooling box (3).

2. The anti-oxidation sealing device for a ternary eutectic alloy plated steel sheet during a production process according to claim 1, characterized by, The plurality of first nozzles (31) are connected with the nitrogen source through a first pipeline (6), and the first pipeline (6) is provided with a flow meter and a control valve.

3. The anti-oxidation sealing device for a ternary eutectic alloy plated steel sheet during a production process according to claim 1, characterized by, The movable cooling air box (4) is slidably arranged above the nitrogen cooling box (3), the lower part of the movable cooling air box (4) is provided with a plurality of second nozzles (41), the upper part of the movable cooling air box (4) is provided with a plurality of third nozzles (42), and the middle part of the movable cooling air box (4) is provided with a plurality of fourth nozzles (43).

4. The anti-oxidation sealing device for a ternary eutectic alloy plated steel sheet during a production process according to claim 3, characterized by, The plurality of second nozzles (41) are arranged in a downward inclination mode, the plurality of third nozzles (42) are arranged in a horizontal mode, and the plurality of fourth nozzles (43) are arranged in an upward inclination mode.

5. The anti-oxidation sealing device for a ternary eutectic alloy plated steel sheet during a production process according to claim 3, characterized by, The plurality of second nozzles (41) are connected with the nitrogen source through a second pipeline (7), and the plurality of third nozzles (42) and the plurality of fourth nozzles (43) are connected with an air source through a third pipeline (8).

6. The anti-oxidation sealing device for a ternary eutectic alloy plated steel sheet during a production process according to claim 5, characterized by, The second pipeline (7) is provided with a flow meter and a control valve, and the third pipeline (8) is provided with a first fan (9) and a variable frequency motor.

7. The anti-oxidation sealing device for a ternary eutectic alloy plated steel sheet during a production process according to claim 1, characterized in that, The gas knife (2) is connected with the nitrogen source through a fourth pipeline (10) and a fifth pipeline (11), and the fifth pipeline (11) is provided with a second fan (12).

8. The anti-oxidation sealing device for a ternary eutectic alloy plated steel sheet during a production process according to claim 1, characterized by, The movable cooling air box (4) is further provided with a tower top deflection roller (5) above the movable cooling air box (4), and the outer periphery of the tower top deflection roller (5) is covered with an anti-scald non-woven fabric.

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