Surface paint spraying equipment for steel coil production and use method

Abstract

The invention discloses surface paint spraying equipment for steel coil production and a using method, and relates to the technical field of steel coil production, the surface paint spraying equipment comprises a bottom plate, an adjusting paint spraying structure is mounted at the center of the upper end of the bottom plate, a limiting grinding structure is mounted on one side of the adjusting paint spraying structure, and a drying structure is mounted on the other side of the adjusting paint spraying structure; the adjustable paint spraying structure comprises two vertical plates, two paint spraying pipes, a plurality of nozzles, two liquid inlet pipes, two bearings, two adjusting screw rods, two sealing frames and two first limiting rollers; according to the adjustable paint spraying structure, when the adjustable paint spraying structure is used, the two paint spraying pipes are matched with each other, stable paint spraying treatment on the steel coil can be achieved, the two sides of the two paint spraying pipes can be adjusted and sealed through the two adjustable sealing frames, and therefore when the small-specification steel coil is subjected to paint spraying, sprayed paint can be conveyed to the center position in a centralized mode, and the paint spraying efficiency is improved. And waste of paint spraying is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of steel coil production, in particular to a surface painting device for steel coil production and a usage method thereof. Background Art

[0002] The surface painting device for steel coil production is a key device for coating the surfaces of cold-rolled steel coils, galvanized coils, etc., aiming to improve the corrosion resistance, aesthetics and functionality of the steel coils;

[0003] Most of the current painting devices for steel coil production adopt a painting method with a fixed width. When producing steel coils of different specifications, there are relatively large gaps on both sides, resulting in paint spraying on both sides of the steel coil. On the one hand, it causes waste of paint, and on the other hand, as the processing time increases, it will cause pollution to the surrounding environment and even affect the subsequent painting processing effect of the steel coil. At the same time, most of the current steel coil painting devices do not have a pretreatment structure. Therefore, in order to ensure the painting effect of the steel coil, it is necessary to select a specified type of pretreatment device according to the specifications of the steel coil to be painted. When processing steel coils of different specifications, it is necessary to frequently replace the supporting equipment, and the operation is relatively cumbersome, affecting the overall processing efficiency of the steel coil. In view of this, for the above problems, there may already be technical means to solve them in the prior art, but this case wants to provide an alternative or replacement technical solution. Summary of the Invention

[0004] The purpose of the present invention is to solve the above problems, and a surface painting device for steel coil production and a usage method thereof are designed, which solve the problem that the existing painting method with a fixed width has relatively large gaps on both sides when producing steel coils of different specifications, resulting in paint spraying on both sides of the steel coil. On the one hand, it causes waste of paint, and on the other hand, as the processing time increases, it will cause pollution to the surrounding environment and even affect the subsequent painting processing effect of the steel coil. At the same time, most of the current steel coil painting devices do not have a pretreatment structure. Therefore, in order to ensure the painting effect of the steel coil, it is necessary to select a specified type of pretreatment device according to the specifications of the steel coil to be painted. When processing steel coils of different specifications, it is necessary to frequently replace the supporting equipment, and the operation is relatively cumbersome, affecting the overall processing efficiency of the steel coil.

[0005] To achieve the above object, the technical solution of the present invention is: a surface painting device for steel coil production, including a bottom plate, a regulating painting structure is installed at the center of the upper end of the bottom plate, a limiting and grinding structure is installed on one side of the regulating painting structure, and a drying structure is installed on the other side of the regulating painting structure;

[0006] The regulating painting structure includes: two vertical plates, two painting pipes, a number of nozzles, two liquid inlet pipes, two bearings, two regulating screws, two sealing frames and two first limiting rollers;

[0007] The two vertical plates are respectively installed on both sides of the upper end of the bottom plate. Both ends of the two paint spraying pipes are respectively connected to the inner walls of the two vertical plates. A number of the spray heads are all installed on the side walls of the two paint spraying pipes. One ends of the two liquid inlet pipes are respectively communicated with the centers of the two paint spraying pipes. The two bearings are respectively installed on the outer walls of the two vertical plates. One ends of the two adjusting screws are respectively connected to the two bearings. The two sealing frames are respectively movably inserted into the two vertical plates, and one ends are respectively located on both sides between the two paint spraying pipes. The other ends of the two sealing frames are respectively movably sleeved on the upper ends of the two adjusting screws. The two first limiting rollers are respectively movably inserted into one sides of the two sealing frames.

[0008] Preferably, the limiting and grinding structure includes: a limiting frame, a lead screw, two limiting blocks, two second limiting rollers, a grinding frame, four damping springs, four moving blocks, an electric push rod and two grinding belts;

[0009] The limiting frame is fixedly installed on one side of the upper end of the bottom plate. Both ends of the lead screw are respectively movably inserted into the side wall surfaces on both sides of the limiting frame. The two limiting blocks are respectively movably inserted into both sides inside the limiting frame, and are respectively movably sleeved on both sides of the upper end of the lead screw. The two second limiting rollers are respectively installed on the upper ends of the two limiting blocks. The grinding frame is installed on the upper end of the bottom plate and is located on one side of the limiting frame. The four damping springs are all located on the upper end of the bottom plate and are located at the four corners of the inner lower end of the grinding frame. The four moving blocks are respectively movably sleeved at the four corners of the grinding frame. The electric push rod is fixedly inserted into the center of the upper wall surface of the grinding frame. One of the grinding belts is installed on the upper ends of the four damping springs, and the other grinding belt is installed on the lower ends of the four moving blocks, and the center of the upper end is connected to the telescopic end of the electric push rod.

[0010] Preferably, the drying structure includes: a drying box body, two pre-treatment air pipes and two air inlet pipes;

[0011] The drying box body is fixedly installed on the other side of the upper end of the bottom plate. The two pre-treatment air pipes are both installed on one side wall surface of the drying box body. One ends of the two air inlet pipes are respectively connected to one ends of the two pre-treatment air pipes.

[0012] Preferably, a support and conveying structure is installed on the upper end of the bottom plate. The support and conveying structure includes: three conveying frames and three conveying rollers;

[0013] The three conveying frames are all installed on the upper end of the bottom plate, and two of the conveying frames are respectively located on both sides of the grinding frame, and the other conveying frame is located on one side of the drying box body. The three conveying rollers are respectively installed on the upper ends of the three conveying frames.

[0014] Preferably, the sealing frame is a U-shaped sealing frame, and a support plate is installed on one side inside.

[0015] Preferably, an internal thread is machined at the connection position between the sealing frame and the adjusting screw.

[0016] A method for using a surface painting device for steel coil production includes the following steps;

[0017] Step S1: First, move this device to the designated position and support this device through the provided bottom plate;

[0018] Step S2: According to the specifications of the steel coil to be painted, turn the two adjusting screws in the two bearings. Through the cooperation of the two adjusting screws with the internal threads on one side of the two sealing frames, change the positions of the two sealing frames in the two vertical plates. Move the two sealing frames towards the center, and seal the nozzles on both sides of the two paint pipes through the two ends of the two sealing frames to avoid waste of paint on both sides of the steel coil;

[0019] Step S3: Subsequently, adjust the limit grinding structure. Pass one end of the steel coil through the limit grinding structure, the adjustable paint spraying structure, and the drying structure in sequence, and then connect it to the winding equipment;

[0020] Step S4: The limit grinding structure performs double-sided grinding on the steel coil, and after grinding, the steel coil moves between the two first limit rollers;

[0021] Step S5: Connect the two liquid inlet pipes to the paint spraying and conveying equipment, convey the paint into the two paint pipes, and atomize and spray the paint through the exposed nozzles to spray paint on both sides of the steel coil;

[0022] Step S6: The painted steel coil is moved into the drying structure under the traction of the winding equipment, and the drying structure performs pre-treatment and drying on the steel coil;

[0023] Preferably, in step S3, turn the screw rod in the limit frame. The screw rod is a double-thread screw rod and is matched with the internal threads in the two limit blocks, so that the two limit blocks move relatively, change the distance between the two second limit rollers, and convey and limit the steel coil through the two second limit rollers.

[0024] Preferably, in step S3, use the electric push rod to change the height of one of the grinding belts until it fits the upper surface of the steel coil. At the same time, under the support of the four damping springs, make the other grinding belt fit the lower wall surface of the steel coil. The two grinding belts cooperate with each other to perform grinding on both sides of the steel coil.

[0025] Preferably, in step S6, through the cooperation of two air inlet pipes and two pre-treatment air pipes, normal temperature gas is conveyed to the surface of the steel coil for pre-drying treatment of the paint spraying. Subsequently, under the traction of the winding equipment, the steel coil enters the drying box body, and the surface of the steel coil is subjected to high-temperature drying treatment through the drying box body.

[0026] A surface paint spraying device for steel coil production using the technical solution of the present invention. The adjustable paint spraying structure adopted in this case, when in use, through the cooperation of the two paint spraying pipes provided, stable paint spraying treatment of the steel coil can be realized, and through the two adjustable sealing frames, the two sides of the two paint spraying pipes can be adjusted and closed. Therefore, when spraying paint on small-sized steel coils, the paint spraying can be concentrated and conveyed to the central position, reducing the waste of paint spraying and avoiding environmental impact at the same time. And through the two first limiting rollers provided, the two sides of the steel coil can be conveyed and limited, ensuring that the steel coil is always located at the central position, further improving the paint spraying effect of the steel coil. At the same time, the adopted limiting and grinding structure pre-grinds the steel coil to be painted, ensuring the adhesion of the paint to the wall surface of the steel coil. At the same time, according to different specifications and different thicknesses of the steel coil, the steel coil can be limitedly conveyed and the grinding operation can be adjusted to ensure the overall grinding effect of the steel coil. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a front view three-dimensional structural schematic diagram of a surface paint spraying device for steel coil production according to the present invention.

[0028] Figure 2 It is a rear view three-dimensional structural schematic diagram of a surface paint spraying device for steel coil production according to the present invention.

[0029] Figure 3 It is a front view structural schematic diagram of a surface paint spraying device for steel coil production according to the present invention.

[0030] Figure 4 It is a side view sectional structural schematic diagram of a surface paint spraying device for steel coil production according to the present invention.

[0031] Figure 5 It is an enlarged structural schematic diagram at "A" of a surface paint spraying device for steel coil production according to the present invention.

[0032] In the figure: 1, bottom plate; 2, vertical plate; 3, paint spraying pipe; 4, spray head; 5, liquid inlet pipe; 6, bearing; 7, adjusting screw; 8, sealing frame; 9, first limiting roller; 10, limiting frame; 11, lead screw; 12, limiting block; 13, second limiting roller; 14, grinding frame; 15, damping spring; 16, moving block; 17, electric push rod; 18, grinding belt; 19, drying box body; 20, pre-treatment air pipe; 21, air inlet pipe; 22, conveying frame; 23, conveying roller; 24, support plate. DETAILED DESCRIPTION OF THE INVENTION

[0033] The present invention will be specifically described below in conjunction with the accompanying drawings. As Figures 1-5 shown, a surface painting device and a usage method for steel coil production.

[0034] Embodiment: A surface painting device for steel coil production, including a bottom plate 1, an adjustment painting structure is installed at the center of the upper end of the bottom plate 1, a limit grinding structure is installed on one side of the adjustment painting structure, and a drying structure is installed on the other side of the adjustment painting structure;

[0035] The adjustment painting structure includes: two vertical plates 2, two painting pipes 3, several nozzles 4, two liquid inlet pipes 5, two bearings 6, two adjustment screws 7, two sealing frames 8 and two first limit rollers 9;

[0036] The two vertical plates 2 are respectively installed on both sides of the upper end of the bottom plate 1, both ends of the two painting pipes 3 are connected to the inner walls of the two vertical plates 2, several nozzles 4 are all installed on the side walls of the two painting pipes 3, one ends of the two liquid inlet pipes 5 are respectively communicated with the centers of the two painting pipes 3, the two bearings 6 are respectively installed on the outer walls of the two vertical plates 2, one ends of the two adjustment screws 7 are respectively connected to the two bearings 6, the two sealing frames 8 are respectively movably inserted into the two vertical plates 2, and one ends are respectively located on both sides between the two painting pipes 3, the other ends of the two sealing frames 8 are respectively movably sleeved on the upper ends of the two adjustment screws 7, and the two first limit rollers 9 are respectively movably inserted into one sides of the two sealing frames 8.

[0037] When painting the steel coil, the staff first moves the device to the designated position, supports the device through the provided bottom plate 1, and then according to the specifications of the steel coil to be painted, turns the two adjustment screws 7 in the two bearings 6. Through the internal thread cooperation between the two adjustment screws 7 and one side of the two sealing frames 8, change the positions of the two sealing frames 8 in the two vertical plates 2. By moving the two sealing frames 8 towards the center, the nozzles 4 on both sides of the two painting pipes 3 are sealed by the two ends of the two sealing frames 8 to avoid waste of paint on both sides of the steel coil. At the same time, the steel coil is limited by the two first limit rollers 9 on one side of the two sealing frames 8. Subsequently, the limit grinding structure is adjusted. After passing one end of the steel coil through the limit grinding structure, the adjustment painting structure and the drying structure in sequence, it is connected to the winding equipment. By energizing the limit grinding structure, the adjustment painting structure, the drying structure and the winding equipment, the winding equipment drives the steel coil to move. At the same time, the limit grinding structure performs double-sided grinding treatment on the steel coil. After grinding, the steel coil moves between the two first limit rollers 9. The two liquid inlet pipes 5 are connected to the paint conveying equipment, and the paint is conveyed into the two painting pipes 3. The paint is atomized and sprayed out through the exposed nozzles 4 to paint both sides of the steel coil. The painted steel coil is moved into the drying structure under the traction of the winding equipment, and the drying structure pre-treats and dries the steel coil.

[0038] In the specific implementation process, the limit grinding structure includes: a limit frame 10, a lead screw 11, two limit blocks 12, two second limit rollers 13, a grinding frame 14, four damping springs 15, four moving blocks 16, an electric push rod 17, and two grinding belts 18;

[0039] The limit frame 10 is fixedly installed on one side of the upper end of the bottom plate 1. The two ends of the lead screw 11 are respectively movably inserted into the side wall surfaces of the two sides of the limit frame 10. The two limit blocks 12 are respectively movably inserted into the inner sides of the limit frame 10, and are respectively movably sleeved on the two upper sides of the lead screw 11. The two second limit rollers 13 are respectively installed on the upper ends of the two limit blocks 12. The grinding frame 14 is installed on the upper end of the bottom plate 1 and is located on one side of the limit frame 10. The four damping springs 15 are all located on the upper end of the bottom plate 1 and are located at the four corners of the inner lower end of the grinding frame 14. The four moving blocks 16 are respectively movably sleeved at the four corners of the grinding frame 14. The electric push rod 17 is fixedly inserted into the center of the upper wall surface of the grinding frame 14. One of the grinding belts 18 is installed on the upper ends of the four damping springs 15, and the other grinding belt 18 is installed on the lower ends of the four moving blocks 16, and the center of the upper end is connected to the telescopic end of the electric push rod 17.

[0040] When processing the steel coil, first turn the lead screw 11 in the limit frame 10. The lead screw 11 adopts a double - threaded lead screw 11 and is matched with the internal threads in the two limit blocks 12, so that the two limit blocks 12 move relatively, changing the distance between the two second limit rollers 13. The steel coil is limited and conveyed by the two second limit rollers 13. Subsequently, drive the electric push rod 17 at the upper end of the grinding frame 14. By the electric push rod 17, the height of one of the grinding belts 18 is changed until it fits the upper surface of the steel coil. At the same time, under the connection action between the four moving blocks 16 and the grinding frame 14, the stability of the grinding belt 18 is ensured. At the same time, under the support of the four damping springs 15, the other grinding belt 18 fits the lower wall surface of the steel coil. The two sides of the steel coil are ground by the cooperation of the two grinding belts 18.

[0041] In the specific implementation process, the drying structure includes: a drying box body 19, two pre - treatment air ducts 20, and two air inlet ducts 21;

[0042] The drying box body 19 is fixedly installed on the other side of the upper end of the bottom plate 1. The two pre - treatment air ducts 20 are both installed at one side wall surface of the drying box body 19. One ends of the two air inlet ducts 21 are respectively connected to one ends of the two pre - treatment air ducts 20.

[0043] When drying the painted steel coil, first, through the cooperation of two air inlet pipes 21 and two pre-treatment air pipes 20, normal temperature gas is conveyed to the surface of the steel coil for pre-drying treatment of the paint. Subsequently, under the traction of the winding equipment, the steel coil enters the drying box body 19, and the surface of the steel coil is subjected to high-temperature drying treatment through the drying box body 19.

[0044] In the specific implementation process, a support and conveying structure is installed on the upper end of the bottom plate 1. The support and conveying structure includes: three conveying frames 22 and three conveying rollers 23;

[0045] The three conveying frames 22 are all installed on the upper end of the bottom plate 1, and two of the conveying frames 22 are respectively located on both sides of the grinding frame 14, and the other conveying frame 22 is located on one side of the drying box body 19. The three conveying rollers 23 are respectively installed on the upper ends of the three conveying frames 22.

[0046] Through the cooperation of the three set conveying frames 22 and the three conveying rollers 23, the conveying and support of the steel coil can be realized, ensuring the stability of the steel coil during the conveying process.

[0047] In the specific implementation process, the sealing frame 8 is a U-shaped sealing frame 8, and a support plate 24 is installed on one side inside.

[0048] In the specific implementation process, internal threads are machined at the connection positions of the sealing frame 8 and the adjusting screw 7.

[0049] A method for using a surface painting device for steel coil production includes the following steps;

[0050] Step S1: First, move this device to the designated position and support this device through the set bottom plate 1;

[0051] Step S2: According to the specifications of the steel coil to be painted and processed, turn the two adjusting screws 7 in the two bearings 6. Through the cooperation of the two adjusting screws 7 and the internal threads on one side of the two sealing frames 8, change the positions of the two sealing frames 8 in the two vertical plates 2. Move the two sealing frames 8 towards the center, and seal the nozzles 4 on both sides of the two paint spraying pipes 3 through the two ends of the two sealing frames 8 to avoid waste of paint on both sides of the steel coil;

[0052] Step S3: Subsequently, adjust the limit grinding structure. Pass one end of the steel coil through the limit grinding structure, the adjustable paint spraying structure, and the drying structure in sequence, and then connect it to the winding equipment;

[0053] Step S4: The limit grinding structure performs double-sided grinding treatment on the steel coil. After grinding, the steel coil moves between the two first limit rollers 9;

[0054] Step S5: Connect to the paint spraying and conveying equipment through two liquid inlet pipes 5, convey the paint into the two paint spraying pipes 3, atomize and spray the paint through the exposed nozzles 4, and perform paint spraying treatment on both sides of the steel coil;

[0055] Step S6: The painted steel coil is moved into the drying structure under the traction of the winding equipment, and the steel coil is pre-treated and dried through the drying structure;

[0056] In the specific implementation process, in step S3, turn the screw rod 11 in the limit frame 10. The screw rod 11 is a bidirectional threaded screw rod 11 and is matched with the internal threads in the two limit blocks 12, so that the two limit blocks 12 move relatively, change the distance between the two second limit rollers 13, and limit and convey the steel coil through the two second limit rollers 13.

[0057] In the specific implementation process, in step S3, change the height of one of the grinding belts 18 through the electric push rod 17 until it fits the upper surface of the steel coil. At the same time, under the support of the four damping springs 15, make the other grinding belt 18 fit the lower wall surface of the steel coil, and cooperate with the two grinding belts 18 to grind both sides of the steel coil.

[0058] In the specific implementation process, in step S6, cooperate with two air inlet pipes 21 and two pre-treatment air pipes 20 to convey normal temperature gas to the surface of the steel coil to perform dry pre-treatment on the paint spraying. Subsequently, under the traction of the winding equipment, the steel coil enters the drying box 19, and the surface of the steel coil is subjected to high-temperature drying treatment through the drying box 19.

[0059] The above technical solutions only reflect the preferred technical solutions of the technical solutions of the present invention. Some changes that those skilled in the art in this technical field may make to some parts thereof all reflect the principles of the present invention and fall within the protection scope of the present invention.

Claims

1. A surface painting device for steel coil production, including a bottom plate (1), characterized in that, An adjusting and spraying structure is installed at the center of the upper end of the bottom plate (1). A limiting and grinding structure is installed on one side of the adjusting and spraying structure, and a drying structure is installed on the other side of the adjusting and spraying structure; The adjusting and spraying structure includes: two vertical plates (2), two spraying pipes (3), a number of nozzles (4), two liquid inlet pipes (5), two bearings (6), two adjusting screws (7), two sealing frames (8), and two first limiting rollers (9); The two vertical plates (2) are respectively installed on both sides of the upper end of the bottom plate (1). The two ends of the two spraying pipes (3) are respectively connected to the inner walls of the two vertical plates (2). A number of the nozzles (4) are all installed on the side walls of the two spraying pipes (3). One ends of the two liquid inlet pipes (5) are respectively communicated with the centers of the two spraying pipes (3). The two bearings (6) are respectively installed on the outer walls of the two vertical plates (2). One ends of the two adjusting screws (7) are respectively connected to the two bearings (6). The two sealing frames (8) are respectively movably embedded in the two vertical plates (2), and one ends are respectively located on both sides between the two spraying pipes (3). The other ends of the two sealing frames (8) are respectively movably sleeved on the upper ends of the two adjusting screws (7). The two first limiting rollers (9) are respectively movably embedded in one sides of the two sealing frames (8).

2. The surface painting equipment for steel coil production according to claim 1, wherein, The limiting and grinding structure includes: a limiting frame (10), a lead screw (11), two limiting blocks (12), two second limiting rollers (13), a grinding frame (14), four damping springs (15), four moving blocks (16), an electric push rod (17), and two grinding belts (18); The limiting frame (10) is fixedly installed on one side of the upper end of the bottom plate (1). The two ends of the lead screw (11) are respectively movably embedded in the side wall surfaces on both sides of the limiting frame (10). The two limiting blocks (12) are respectively movably embedded in both sides of the limiting frame (10), and are respectively movably sleeved on both sides of the upper end of the lead screw (11). The two second limiting rollers (13) are respectively installed on the upper ends of the two limiting blocks (12). The grinding frame (14) is installed on the upper end of the bottom plate (1) and is located on one side of the limiting frame (10). The four damping springs (15) are all located on the upper end of the bottom plate (1) and are located at the four corners of the inner lower end of the grinding frame (14). The four moving blocks (16) are respectively movably sleeved at the four corners of the grinding frame (14). The electric push rod (17) is fixedly embedded in the center of the upper wall surface of the grinding frame (14). One of the grinding belts (18) is installed on the upper ends of the four damping springs (15), and the other grinding belt (18) is installed on the lower ends of the four moving blocks (16), and the center of the upper end is connected to the telescopic end of the electric push rod (17).

3. The surface painting device for steel coil production according to claim 2, characterized in that, The drying structure includes: a drying box body (19), two pretreatment air pipes (20), and two air inlet pipes (21); The drying box body (19) is fixedly installed on the upper end of the other side of the bottom plate (1). Both of the two pre-treatment air ducts (20) are installed on one side wall surface of the drying box body (19). One end of each of the two air inlet ducts (21) is respectively connected to one end of each of the two pre-treatment air ducts (20).

4. The surface painting equipment for steel coil production according to claim 3, characterized in that, A support and conveying structure is installed on the upper end of the bottom plate (1). The support and conveying structure includes: three conveying frames (22) and three conveying rollers (23); All of the three conveying frames (22) are installed on the upper end of the bottom plate (1). And two of the three conveying frames (22) are respectively located on both sides of the grinding frame (14), and the other conveying frame (22) is located on one side of the drying box body (19). The three conveying rollers (23) are respectively installed on the upper ends of the three conveying frames (22).

5. The surface painting equipment for steel coil production according to claim 1, characterized in that, The sealing frame (8) is a U-shaped sealing frame (8), and a support plate (24) is installed on one side inside it.

6. The surface painting device for steel coil production according to claim 1, characterized in that, The position where the sealing frame (8) is connected to the adjusting screw (7) is machined with internal threads.

7. A method of using a surface painting device for steel coil production according to claim 1, characterized in that, It includes the following steps; Step S1: First, move the device to a specified position, and support the device through the provided bottom plate; Step S2: According to the specifications of the steel coil to be spray-painted, turn the two adjusting screws in the two bearings. Through the cooperation of the two adjusting screws and the internal threads on one side of the two sealing frames, change the positions of the two sealing frames in the two vertical plates. Move the two sealing frames towards the center, and seal the nozzles on both sides of the two spray pipes through the two ends of the two sealing frames, so as to avoid waste of spray paint on both sides of the steel coil; Step S3: Subsequently, adjust the limit grinding structure. Pass one end of the steel coil through the limit grinding structure, the adjusting spray painting structure, and the drying structure in sequence, and then connect it to the winding equipment; Step S4: The limit grinding structure performs double-sided grinding treatment on the steel coil. After grinding, the steel coil moves between the two first limit rollers; Step S5: Connect the two liquid inlet pipes to the spray painting conveying equipment, convey the spray paint into the two spray pipes, and atomize and spray the spray paint through the exposed nozzles to perform spray painting treatment on both sides of the steel coil; Step S6: The spray-painted steel coil is moved into the drying structure under the traction of the winding equipment, and the drying structure performs pre-treatment and drying treatment on the steel coil.

8. The usage method of a surface painting device for steel coil production according to claim 7, characterized in that, In the step S3, turn the screw rod in the limit frame. The screw rod is a double-thread screw rod and is matched with the internal threads in the two limit blocks, so that the two limit blocks move relatively, change the distance between the two second limit rollers, and perform limit conveying on the steel coil through the two second limit rollers.

9. The usage method of a surface painting device for steel coil production according to claim 7, characterized in that, In the step S3, change the height of one of the grinding belts through the electric push rod until it fits the upper surface of the steel coil. At the same time, under the support of the four damping springs, make the other grinding belt fit the lower wall surface of the steel coil. Through the cooperation of the two grinding belts, perform grinding treatment on both sides of the steel coil.

10. The usage method of a surface painting device for steel coil production according to claim 7, characterized in that, In the step S6, through the cooperation of the two air inlet ducts and the two pre-treatment air ducts, convey the normal temperature gas to the surface of the steel coil to perform pre-drying treatment on the spray paint. Subsequently, under the traction of the winding equipment, the steel coil enters the drying box body, and the drying box body performs high-temperature drying treatment on the surface of the steel coil.

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