Hot galvanizing air knife lip cleaning system and method

Abstract

The invention belongs to the technical field of cold-rolled strip steel production, and particularly relates to a hot galvanizing air knife lip cleaning system and method. The system comprises an air knife body and a driving device in sliding connection with the outer side of the air knife body, one end of the driving device is connected with a scraper device, the driving device drives the scraper device to move in the direction of an air knife lip in the air knife body, and the air knife lip comprises an upper knife lip and a lower knife lip; the scraper device is provided with a first blade, a second blade and a third blade, the first blade is used for cleaning the inner side of the upper knife lip, the second blade is used for cleaning the inner side of the lower knife lip, and the third blade is used for cleaning the outer sides of the upper knife lip and the lower knife lip. According to the system, zinc dross on the air knife lip can be effectively removed in time through cooperative operation of the external scraper device and the driving device, meanwhile, the scraper device is correspondingly provided with blades at different cleaning positions, all parts of the knife lip can be effectively cleaned, and air knife stripes cannot be left on the plate face.

Description

Technical Field

[0001] The invention belongs to the technical field of cold-rolled strip steel production, and in particular relates to a hot-dip galvanizing air knife lip cleaning system and method. Background Art

[0002] Hot-dip galvanizing is a process that forms a zinc coating on the surface of steel strip to isolate the metal from the corrosive medium. The produced galvanized sheet is widely used in the manufacturing industry for its excellent corrosion resistance, good weldability and plastic formability. The air knife is a key equipment in hot-dip galvanizing production. Its working principle is that the gas is sprayed from the air knife nozzle to the surface of the steel strip at a certain pressure, and the excess zinc liquid on the surface of the steel strip is removed by the pressure of the gas. The purpose of controlling the thickness and uniformity of the galvanized layer is achieved by adjusting the spraying pressure of the air knife. When the steel strip passes through the zinc pot at a certain speed, the zinc liquid is continuously taken out of the zinc pot. Under the influence of the zinc liquid's own weight and external cooling, the zinc liquid on the surface of the steel strip after leaving the zinc pot is uneven, and the air knife scrapes the excess zinc liquid by the airflow component in the opposite direction of the running direction of the steel strip.

[0003] Air knife is affected by the turbulent airflow at the edge of the strip, causing zinc liquid or foreign matter to splash and adhere to the air knife lip, affecting the continuity and uniformity of the airflow ejected from the air knife lip, which is easy to cause defects in the strip coating and affect the surface quality of hot-dip galvanized products. At present, the built-in air knife lip cleaning device is widely used. It is connected to the cylinder by the steel wire to drive the sliding trolley inside the lip, sliding left and right to remove the zinc slag. However, it is easy to cause steel wire wear and trolley jamming during high-temperature operation, so most of the time, manual lip cleaning is adopted, but manual lip cleaning has various problems such as inconvenient operation, unclean cleaning, high intensity, low efficiency, and unsafe. Summary of the invention

[0004] The purpose of the present invention is to solve the problems of steel wire wear and jamming, unstable operation, inconvenient manual operation, high strength, low efficiency and unsafety of hot-dip galvanizing air knife lip cleaning devices in the prior art, and thus propose a hot-dip galvanizing air knife lip cleaning system and method. The system includes a scraper device arranged on the outside of the air knife, and the blade head of the scraper device is equipped with three independent blades, and the three independent blades are used to clean the inner surface of the upper air knife lip, the inner surface of the lower air knife lip and the front surface of the upper and lower blade lips respectively, and at the same time, the scraper device is driven by a rodless cylinder to move along the blade lip direction of the air knife, so as to effectively remove the zinc slag on the inner and outer surfaces of the blade lip.

[0005] The first aspect of the present invention provides a hot-dip galvanizing air knife lip cleaning system, the system comprising an air knife body, a driving device slidably connected to the outer side of the air knife body, one end of the driving device is connected to a scraper device, the driving device drives the scraper device to move along the direction of the air knife lip in the air knife body, the air knife lip comprises an upper lip and a lower lip;

[0006] The scraper device is provided with a first blade, a second blade and a third blade, the first blade is used to clean the inner side of the upper blade lip, the second blade is used to clean the inner side of the lower blade lip, and the third blade is used to clean the outer sides of the upper blade lip and the lower blade lip.

[0007] Preferably, a raised component is fixed on the air knife body above the air knife lip, the raised component is coupled to a movable slider, the movable slider is fixedly connected to a driving device, and the driving device drives the movable slider to move along the direction of the raised component, thereby driving the scraper device to move along the direction of the air knife lip in the air knife body.

[0008] More preferably, the protruding part is arranged parallel to the air knife lip.

[0009] Preferably, the first blade, the second blade and the third blade all have a connecting part and a cleaning part, and the connecting parts of the first blade, the second blade and the third blade are all fixed on a connecting rod, and the connecting rod is fixedly connected to the driving device; the cleaning parts of the first blade and the second blade both extend into the interior of the air knife lip, and the cleaning part of the first blade contacts the upper lip, and the cleaning part of the second blade contacts the lower lip; the cleaning part of the third blade is respectively located on the outer side of the upper lip and the outer side of the lower lip, and the cleaning parts of the third blade contact the upper lip and the lower lip, respectively.

[0010] More preferably, a first fixing plate is provided on a side wall of the driving device, the first fixing plate is used to support the driving device in a balanced state, and the first fixing plate is fixedly connected to the movable slider via a connecting plate.

[0011] More preferably, a bottom plate and a second fixing plate are sequentially mounted on the bottom of the driving device, and the connecting rod is fixedly connected to the second fixing plate.

[0012] Preferably, a cooler is installed near the driving device, and the cooler is used to cool the driving device; a heat insulation protection cover is installed outside the driving device, and the heat insulation protection cover is used to prevent dust and heat from the driving device.

[0013] Preferably, the air knife body comprises an air knife cavity, both ends of the air knife cavity are provided with end plates, a buffer is fixedly provided on the inner side of the end plate of the air knife cavity, and the buffer is used for vibration reduction and buffering.

[0014] Preferably, the system comprises two air knife bodies, and the two air knife bodies are symmetrically arranged, wherein the outer side of one of the air knife bodies is slidably connected to a driving device, one end of the driving device is connected to a scraper device, and the scraper device is located between the two air knife bodies; the driving device drives the scraper device to move along the direction of the air knife lips in the two air knife bodies respectively; one side of the scraper device is respectively provided with a first blade, a second blade and a third blade, and the other side of the scraper device is also respectively provided with a first blade, a second blade and a third blade, and the first blades on both sides of the scraper device are symmetrically arranged, the second blades on both sides of the scraper device are symmetrically arranged, and the third blades on both sides of the scraper device are symmetrically arranged; when in use, the two first blades, two second blades and two third blades symmetrically arranged on both sides of the scraper device respectively clean the inner side of the upper knife body, the inner side of the lower knife body, and the outer side of the upper knife body and the lower knife body in the two air knife bodies at the same time.

[0015] The second aspect of the present invention proposes a method for cleaning the lip of a hot-dip galvanizing air knife implemented in the above-mentioned system, the method comprising: when in use, the driving device drives the scraper device to move along the direction of the air knife lip in the air knife body; the first blade cleans the inner side of the upper lip, the second blade cleans the inner side of the lower lip, and the third blade cleans the outer sides of the upper and lower lips at the same time.

[0016] The hot-dip galvanizing air knife lip cleaning system and method described in the present invention have at least the following beneficial effects:

[0017] (1) In the system of the present invention, the external scraper device and the driving device cooperate to effectively remove the zinc slag on the air knife lip in a timely manner. At the same time, the scraper device is provided with blades at different cleaning positions, which can effectively clean all parts of the knife lip and will not leave air knife streaks on the board surface.

[0018] (2) In the present invention, a high-temperature resistant rodless pneumatic cylinder is used as a driving device to drive the scraper device to move along the direction of the air knife lip. Since the cylinder operates stably, moves freely, has a high operating speed, moves stably and reliably, and is not prone to jamming, it can efficiently remove slag on the lip of the knife and is not prone to scratching the lip working surface to cause coating defects. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic structural diagram of a hot-dip galvanizing air knife lip cleaning system in one embodiment of the present invention, a is a main view, and b is a side view;

[0020] Figure 2 It is a schematic structural diagram of a driving device and a scraper device in one embodiment of the present invention;

[0021] Figure 3Schematic diagram of the structure of the air knife lip and the scraping device in an embodiment of the present invention.

[0022] Reference numerals

[0023] 1. Air knife body; 2. Driving device; 3. Scraping device; 4. Air knife lip; 5. First blade; 6. Second blade; 7. Third blade; 8. Upper lip; 9. Lower lip; 10. Protruding member; 11. Moving slider; 12. Connecting rod; 13. First fixing plate; 14. Connecting plate; 15. Base plate; 16. Second fixing plate; 17. Cooler; 18. Heat insulation protection cover; 19. Air knife cavity; 20. End plate; 21. Buffer; 22. First bolt; 23. Second bolt; 24. Upper knife body; 25. Lower knife body. Detailed implementation manners

[0024] The following will describe in detail the specific implementation manners of the present invention with reference to the accompanying drawings. It should be understood that the specific implementation manners described herein are only for explaining and illustrating the present invention, and are not used to limit the present invention.

[0025] The first aspect of the present invention provides a hot-dip galvanizing air knife lip cleaning system, as Figures 1 to 3 shown, the system includes an air knife body 1 and a driving device 2 slidably connected to the outside of the air knife body 1. One end of the driving device 2 is connected to a scraping device 3. The driving device 2 drives the scraping device 3 to move along the direction of the air knife lip 4 in the air knife body 1. The air knife lip 4 includes an upper lip 8 and a lower lip 9. The scraping device 3 is provided with a first blade 5, a second blade 6 and a third blade 7. The first blade 5 is used to clean the inner side of the upper lip 8, the second blade 6 is used to clean the inner side of the lower lip 9, and the third blade 7 is used to clean the outer sides of the upper lip 8 and the lower lip 9.

[0026] In the specific implementation manner of the system of the present invention, as Figure 1 shown, the air knife body 1 includes an air knife main body with a tubular structure and a cylindrical air knife cavity 19. The air knife main body with a tubular structure is connected to the cylindrical air knife cavity 19, and the air knife main body is located above the air knife cavity 19. An upper knife body support and a lower knife body support are respectively located on both sides of the opening of the air knife cavity 19 and are connected to the air knife main body. An upper knife body 24 and a lower knife body 25 are respectively connected to adjacent sides of the upper knife body support and the lower knife body support and are configured to move in a direction approaching or moving away from each other to adjust the air outlet gap. The air outlet gap between the upper knife body 24 and the lower knife body 25 is the air knife lip 4.

[0027] In the specific implementation manner of the system of the present invention, the driving device 2 can be a rodless air cylinder, which has stable operation, moves freely, has a fast running speed, stable and reliable actions, and is not easily jammed.

[0028] In a specific embodiment of the system of the present invention, a protruding component 10 is fixed to the air knife body 1 above the air knife lip 4, and the length of the protruding component 10 is consistent with the length of the air knife body of the tubular structure, that is, the protruding component 10 is a long strip component with a protrusion, and the protruding component 10 is coupled to a movable slider 11. Specifically, the movable slider 11 has a groove corresponding to the protruding component 10, and the protruding component 10 is engaged and connected with the movable slider 11; the movable slider 11 is fixedly connected to the driving device 2, and the driving device 2 drives the movable slider 11 to move along the length direction of the protruding component 10, thereby driving the scraper device 3 to move along the length direction of the air knife lip 4 in the air knife body 1.

[0029] In a preferred embodiment of the system of the present invention, in order to enable the driving device 2 to more smoothly drive the scraper device 3 to move along the length direction of the air knife lip 4 in the air knife body 1, thereby more effectively scraping off the zinc liquid or foreign matter on the air knife lip 4, the protruding part 10 is arranged parallel to the air knife lip 4.

[0030] In a specific embodiment of the system of the present invention, a first fixing plate 13 is provided on the side wall of the driving device 2. The first fixing plate 13 is used to support the driving device 2 in a balanced state. The first fixing plate 13 is fixedly connected to the movable slider 11 via a connecting plate 14.

[0031] In a specific embodiment of the system of the present invention, a base plate 15 and a second fixing plate 16 are sequentially installed at the bottom of the driving device 2, the base plate 15 and the second fixing plate 16 are connected and fixed to the driving device 2 by a first bolt, and the connecting rod 12 is fixedly connected to the second fixing plate 16.

[0032] In a specific embodiment of the system of the present invention, Figures 2-3As shown, the first blade 5, the second blade 6 and the third blade 7 all have a connecting portion and a cleaning portion, and the connecting portions of the first blade 5, the second blade 6 and the third blade 7 are all fixed to the connecting rod 12 by a second bolt 23, and the connecting rod 12 is fixedly connected to the second fixing plate 16; the cleaning portions of the first blade 5 and the second blade 6 both extend into the interior of the air knife lip 4, and the cleaning portion of the first blade 5 contacts the upper blade 8, and the cleaning portion of the second blade 6 contacts the lower blade 9. Specifically, the cleaning portions of the first blade 5 and the second blade 6 are both sharp The blade can effectively remove the zinc slag or foreign matter on the inner side of the upper blade 8 and the lower blade 9; the cleaning part of the third blade 7 is respectively located on the outer side of the upper blade 8 and the outer side of the lower blade 9, and the cleaning part of the third blade 7 is in contact with the upper blade 8 and the lower blade 9 respectively. Specifically, the cleaning part of the third blade 7 is a U-shaped structure, and the mutually parallel parts of the U-shaped structure are in contact with the outer side of the upper blade 8 and the outer side of the lower blade 9 respectively. The mutually parallel parts of the U-shaped structure are sharp blades, which can effectively remove the zinc slag or foreign matter on the outer side of the upper blade 8 and the lower blade 9.

[0033] In a specific embodiment of the system of the present invention, Figure 2 As shown, a cooler 17 is fixed by a circular ring near the driving device 2, and the cooler 17 is used to cool the driving device 2. Specifically, the cooler 17 can be a small turbine cooler. A heat insulation protection cover 18 is installed on the outside of the driving device 2, and the heat insulation protection cover 18 is used to prevent dust and heat from the driving device 2, thereby extending the service life of the driving device 2 to the maximum extent.

[0034] In a specific embodiment of the system of the present invention, the air knife body 1 includes an air knife cavity 19, and end plates 20 are provided at both ends of the air knife cavity 19. A buffer 21 is fixedly provided on the end plate 20 on the inner side of the air knife cavity 19. The buffer 21 is used for vibration reduction and buffering, thereby extending the service life of the rodless cylinder.

[0035] In a preferred embodiment of the system of the present invention, Figure 1As shown, the system comprises two air knife bodies 1, and the two air knife bodies 1 are symmetrically arranged, wherein the outer side of one of the air knife bodies 1 is slidably connected with a driving device 2, one end of the driving device 2 is connected with a scraper device 3, and the scraper device 3 is located between the two air knife bodies 1; the driving device 2 drives the scraper device 3 to move along the length direction of the air knife lips 4 in the two air knife bodies 1; one side of the scraper device 3 is respectively provided with a first blade 5, a second blade 6 and a third blade 7, and the other side of the scraper device 3 is also respectively provided with a first blade 5, a second blade 6 and a third blade 7. The scraper device 3 has two blades 7, and the first blades 5 on both sides of the scraper device 3 are symmetrically arranged, the second blades 6 on both sides of the scraper device 3 are symmetrically arranged, and the third blades 7 on both sides of the scraper device 3 are symmetrically arranged; when in use, the two first blades 5, the two second blades 6 and the two third blades 7 symmetrically arranged on both sides of the scraper device 3 respectively clean the inner side of the upper blade body 8, the inner side of the lower blade body 9, and the outer sides of the upper blade body 8 and the lower blade body 9 in the two air knife bodies 1 at the same time. By using this system to process the lip of the hot-dip galvanizing air knife, the slag of the air knife lip can be removed more efficiently, and it is not easy to scratch the working surface of the lip to cause coating defects.

[0036] During the actual operation of the system described in the present invention, the position of the scraper device 3 is adjusted so that the cleaning parts of the first blade 5 and the second blade 6 in the scraper device 3 extend into the interior of the air knife lip 4, and the cleaning part of the first blade 5 contacts the upper knife lip 8, and the cleaning part of the second blade 6 contacts the lower knife lip 9; the cleaning parts of the third blade 7 are respectively located on the outer side of the upper knife lip 8 and the outer side of the lower knife lip 9, and the cleaning parts of the third blade 7 contact the upper knife lip 8 and the lower knife lip 9 respectively, and the driving device 2 drives the scraper device 3 to move along the length direction of the air knife lip 4 in the air knife body 1, the first blade 5 is used to clean the inner side of the upper knife lip 8, the second blade 6 is used to clean the inner side of the lower knife lip 9, and the third blade 7 is used to clean the outer sides of the upper knife lip 8 and the lower knife lip 9 at the same time.

[0037] The second aspect of the present invention proposes a method for cleaning the lip of a hot-dip galvanizing air knife according to the above-mentioned system, the method comprising: when in use, the driving device 2 drives the scraper device 3 to move along the direction of the air knife lip 4 in the air knife body 1; the first blade 5 cleans the inner side of the upper lip 8, the second blade 6 cleans the inner side of the lower lip 9, and the third blade 7 cleans the outer sides of the upper lip 8 and the lower lip 9 at the same time.

[0038] The experimental methods or test methods described in the following examples are conventional methods unless otherwise specified; the reagents and materials are obtained from conventional commercial channels or prepared by conventional methods unless otherwise specified.

[0039] Example 1

[0040] A hot dip galvanizing air knife lip cleaning system, such as Figures 1 to 3 As shown, the system comprises two air knife bodies 1, and the two air knife bodies 1 are symmetrically arranged, wherein a driving device 2 is slidably connected to the outer side of one of the air knife bodies 1, a cooler 17 is fixedly installed in a circular ring near the driving device 2, a heat insulation protection cover 18 is installed on the outside of the driving device 2, and a scraper device 3 is connected to one end of the driving device 2, and the scraper device 3 is located between the two air knife bodies 1;

[0041] The air knife body 1 comprises an air knife body, an air knife cavity 19, an upper knife body 24 and a lower knife body 25. Both ends of the air knife cavity 19 are provided with end plates 20. The end plate 20 is located on the inner side of the air knife cavity 19 and is fixedly provided with a buffer 21. The air outlet gap between the upper knife body 24 and the lower knife body 25 is an air knife lip 4. The air knife lip 4 comprises an upper knife lip 8 and a lower knife lip 9. A strip-shaped convex component 10 is located above the air knife lip 4 and is fixed along the length direction of the air knife body of the tubular structure. The convex component 10 is provided on the inner side of the air knife cavity 19. The convex component 10 is arranged parallel to the air knife lip 4, the convex component 10 is engaged with the movable slider 11, the side wall of the driving device 2 is provided with a first fixing plate 13, the first fixing plate 13 is fixedly connected to the movable slider 11 through a connecting plate 14, and a bottom plate 15 and a second fixing plate 16 are sequentially installed at the bottom of the driving device 2, the bottom plate 15 and the second fixing plate 16 are connected and fixed to the driving device 2 through a first bolt, and the connecting rod 12 is fixedly connected to the second fixing plate 16;

[0042] The first blade 5, the second blade 6 and the third blade 7 are respectively arranged on one side of the scraper device 3, and the first blade 5, the second blade 6 and the third blade 7 are also respectively arranged on the other side of the scraper device 3, and the first blades 5 on both sides of the scraper device 3 are symmetrically arranged, the second blades 6 on both sides of the scraper device 3 are symmetrically arranged, and the third blades 7 on both sides of the scraper device 3 are symmetrically arranged; the first blade 5, the second blade 6 and the third blade 7 all have a connecting part and a cleaning part, and the connecting parts of the first blade 5, the second blade 6 and the third blade 7 are all fixed on the connecting rod 12 by the second bolt 23, and the connecting rod 12 is fixedly connected to the second fixing plate 16; the cleaning parts of the first blade 5 and the second blade 6 extend into the interior of the air knife lip 4, and the cleaning part of the first blade 5 contacts the upper blade 8, and the cleaning part of the second blade 6 contacts the lower blade 9; the cleaning parts of the third blade 7 are respectively located on the outer side of the upper blade 8 and the outer side of the lower blade 9, and the cleaning parts of the third blade 7 contact the upper blade 8 and the lower blade 9 respectively.

[0043] According to the hot-dip galvanizing air knife lip cleaning method of the system described in Example 1, the method comprises:

[0044] Adjust the position of the scraper device 3 so that the cleaning parts of the symmetrically arranged first blade 5 and the second blade 6 in the scraper device 3 respectively extend into the interior of the air knife lips 4 of the two symmetrically arranged air knife bodies 1, and the cleaning part of the first blade 5 contacts the upper blade 8, and the cleaning part of the second blade 6 contacts the lower blade 9; the cleaning parts of the symmetrically arranged third blade 7 in the scraper device 3 are respectively located on the outer side of the upper blade 8 and the outer side of the lower blade 9, and the cleaning parts of the third blade 7 contact the upper blade 8 and the lower blade 9, respectively, and the driving device 2 drives the scraper device 3 to move along the length direction of the air knife lips 4 in the two symmetrically arranged air knife bodies 1, the two first blades 5 simultaneously clean the inner side of the upper blade 8 in the two air knife bodies 1, the two second blades 6 simultaneously clean the inner side of the lower blade 9 in the two air knife bodies 1, and the two third blades 7 simultaneously clean the outer side of the upper blade 8 and the lower blade 9 in the two air knife bodies 1.

[0045] The preferred embodiments of the present invention are described in detail above, but the present invention is not limited thereto. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications, including the combination of various technical features in any other suitable manner, and these simple modifications and combinations should also be regarded as the contents disclosed by the present invention and belong to the protection scope of the present invention.

Claims

1. A hot dip galvanizing air knife lip cleaning system, characterized in that: The system comprises an air knife body (1), a driving device (2) slidably connected to the outer side of the air knife body (1), one end of the driving device (2) being connected to a scraper device (3), the driving device (2) driving the scraper device (3) to move along the direction of an air knife lip (4) in the air knife body (1), the air knife lip (4) comprising an upper lip (8) and a lower lip (9); The scraper device (3) is provided with a first blade (5), a second blade (6) and a third blade (7), wherein the first blade (5) is used to clean the inner side of the upper blade lip (8), the second blade (6) is used to clean the inner side of the lower blade lip (9), and the third blade (7) is used to clean the outer sides of the upper blade lip (8) and the lower blade lip (9).

2. The hot dip galvanizing air knife lip cleaning system according to claim 1, characterized in that: The air knife body (1) is located above the air knife lip (4) and is fixed with a raised component (10); the raised component (10) is coupled to a movable slider (11); the movable slider (11) is fixedly connected to a driving device (2); the driving device (2) drives the movable slider (11) to move along the direction of the raised component (10), thereby driving the scraper device (3) to move along the direction of the air knife lip (4) in the air knife body (1).

3. The hot dip galvanizing air knife lip cleaning system according to claim 2, characterized in that: The raised component (10) is arranged parallel to the air knife lip (4).

4. The hot dip galvanizing air knife lip cleaning system according to claim 1, characterized in that: The first blade (5), the second blade (6) and the third blade (7) all have a connecting portion and a cleaning portion, and the connecting portions of the first blade (5), the second blade (6) and the third blade (7) are all fixed on a connecting rod (12), and the connecting rod (12) is fixedly connected to the driving device (2); The cleaning parts of the first blade (5) and the second blade (6) both extend into the interior of the air knife lip (4), and the cleaning part of the first blade (5) contacts the upper blade lip (8), and the cleaning part of the second blade (6) contacts the lower blade lip (9); The cleaning portion of the third blade (7) is located on the outer side of the upper blade lip (8) and the outer side of the lower blade lip (9), and the cleaning portion of the third blade (7) is in contact with the upper blade lip (8) and the lower blade lip (9), respectively.

5. The hot dip galvanizing air knife lip cleaning system according to claim 2, characterized in that: A first fixing plate (13) is provided on the side wall of the driving device (2), the first fixing plate (13) being used to support the driving device (2) in a balanced state, and the first fixing plate (13) being fixedly connected to the movable slider (11) via a connecting plate (14).

6. The hot dip galvanizing air knife lip cleaning system according to claim 4, characterized in that: A bottom plate (15) and a second fixing plate (16) are sequentially mounted on the bottom of the driving device (2), and the connecting rod (12) is fixedly connected to the second fixing plate (16).

7. The hot dip galvanizing air knife lip cleaning system according to claim 1, characterized in that: A cooler (17) is installed near the driving device (2), and the cooler (17) is used to cool the driving device (2); A heat-insulating protective cover (18) is installed outside the driving device (2), and the heat-insulating protective cover (18) is used to protect the driving device (2) from dust and heat.

8. The hot dip galvanizing air knife lip cleaning system according to claim 1, characterized in that: The air knife body (1) comprises an air knife cavity (19), both ends of the air knife cavity (19) are provided with end plates (20), a buffer (21) is fixedly provided on the inner side of the end plate (20) of the air knife cavity (19), and the buffer (21) is used for vibration reduction and buffering.

9. The hot dip galvanizing air knife lip cleaning system according to claim 1, characterized in that: The system comprises two air knife bodies (1), and the two air knife bodies (1) are symmetrically arranged, the outer side of one of the air knife bodies (1) is slidably connected to a driving device (2), one end of the driving device (2) is connected to a scraper device (3), and the scraper device (3) is located between the two air knife bodies (1); the driving device (2) drives the scraper device (3) to move along the direction of the air knife lips (4) in the two air knife bodies (1); One side of the scraper device (3) is respectively provided with a first blade (5), a second blade (6) and a third blade (7), and the other side of the scraper device (3) is also respectively provided with a first blade (5), a second blade (6) and a third blade (7), and the first blades (5) on both sides of the scraper device (3) are symmetrically arranged, the second blades (6) on both sides of the scraper device (3) are symmetrically arranged, and the third blades (7) on both sides of the scraper device (3) are symmetrically arranged; when in use, the two first blades (5), the two second blades (6) and the two third blades (7) symmetrically arranged on both sides of the scraper device (3) respectively clean the inner side of the upper blade body (8), the inner side of the lower blade body (9), and the outer sides of the upper blade body (8) and the lower blade body (9) in the two air knife bodies (1) at the same time.

10. A method for cleaning the lip of a hot dip galvanizing air knife according to any one of claims 1 to 9, characterized in that: The method includes: When in use, the driving device (2) drives the scraper device (3) to move along the direction of the air knife lip (4) in the air knife body (1); The first blade (5) cleans the inner side of the upper blade lip (8), the second blade (6) cleans the inner side of the lower blade lip (9), and the third blade (7) cleans the outer sides of the upper blade lip (8) and the lower blade lip (9) at the same time.

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