Steel structure painting device and painting method

Abstract

The present invention belongs to the technical field of steel structures and provides a steel structure painting device and painting method. The painting device includes a base, a mounting ring fixedly mounted on the base, a plurality of spaced sliders slidably mounted on the mounting ring, a nozzle connected to an external paint supply device fixedly mounted on the slider, a first movable plate and a second movable plate slidably mounted on the base, located on either side of the mounting ring, a first servo module and a second servo module respectively driving the movement of the first and second movable plates, and a top frame fixedly mounted on the first movable plate. Compared with the prior art, the present invention has the following beneficial effects: alternating fixation of the two ends of the steel structure is achieved, so that the surface of the steel structure can be fully painted at one time, ensuring the uniformity and quality of the paint sprayed on the steel structure surface.

Description

Technical Field

[0001] The invention belongs to the technical field of steel structures, and the paint relates to a steel structure painting device and a painting method. Background Art

[0002] Steel structures are composed of steel materials and are one of the main types of building structures. They primarily consist of beams, columns, and trusses made from sections and plates. Rust removal and prevention processes include silanization, pure manganese phosphating, water washing and drying, and galvanizing. Components are typically connected by welds, bolts, or rivets. Due to their light weight and ease of construction, they are widely used in large factories, stadiums, and high-rise buildings. Steel structures are also rust-proofed using methods such as spray painting to extend their service life.

[0003] When painting steel structures, existing painting devices are used to paint one side of the steel structure before painting the other side, which reduces the painting efficiency of the steel structure and cannot meet the use requirements. To address the above technical problems, Chinese patent publication number CN220496691U supports the two ends of the steel structure through a first rack and a second rack during use, and allows the steel structure to pass through a painting frame. Although the device can simultaneously paint the upper and lower surfaces of the steel structure, the positions supported by the first rack and the second rack cannot be used for painting operations, resulting in the inability to achieve a one-time full painting of the steel structure, which reduces the painting quality of the steel structure. Summary of the Invention

[0004] The purpose of the present invention is to provide a steel structure painting device and a painting method, aiming to solve the technical problem in the prior art that it is impossible to achieve one-time comprehensive painting of the steel structure, thereby reducing the painting quality of the steel structure.

[0005] The present invention is achieved in this way. A steel structure painting device includes a base, a mounting ring is fixedly mounted on the base, a plurality of sets of spaced sliders are slidably mounted on the mounting ring, a nozzle connected to an external paint supply device is fixedly mounted on the slider, a first movable plate and a second movable plate are slidably mounted on the base and are located on both sides of the mounting ring, a first servo module and a second servo module are provided on the base to respectively drive the first movable plate and the second movable plate to move, a top frame is fixedly mounted on the first movable plate, a first telescopic member is fixedly mounted on the top frame, and a first pressure plate is fixedly mounted on the output end of the first telescopic member, and a first support rod located between the mounting ring and the first movable plate is rotatably mounted on the base;

[0006] A first mounting bracket is fixedly mounted on the second movable plate, a first clamping plate and a second clamping plate are slidably mounted on the first mounting bracket, a plurality of groups of spaced grooves are provided on the second movable plate, the first clamping plate and the second clamping plate are both provided with a protruding structure extending into the groove and passing through the second movable plate, a second telescopic member is fixedly mounted on the first clamping plate, an output end of the second telescopic member is fixedly connected to the second clamping plate, a limiting assembly is provided on the first clamping plate, and a first heating plate and a second heating plate for heating and drying the upper and lower surfaces of the steel structure end are provided on the surface of the second movable plate close to the mounting ring.

[0007] Further technical solution: The support height of the top frame to the steel structure is the same as the support height of the first support rod, and the first support rod is arranged close to the mounting ring.

[0008] Further technical solution: the height of the lower end of the groove is lower than the height of the first support rod, and in the initial state, the first splint is located at the lowermost end of the groove and the height of the first splint is lower than the height of the first support rod.

[0009] Further technical solution: The limit assembly includes a limit plate, which is provided with multiple groups and is slidably installed on the first clamping plate. The second movable plate is provided with a limit groove used in conjunction with the limit plate. The end of the limit plate away from the second movable plate is fixedly installed with a first permanent magnet, and the first permanent magnet is used in conjunction with an electromagnet fixedly installed on the first clamping plate. An elastic part is fixedly installed on the surface of the first permanent magnet close to the first clamping plate, and the end of the elastic part away from the first permanent magnet is fixedly connected to the first clamping plate.

[0010] Further technical solution: the first heating plates are provided with multiple groups, the protruding structures of the first heating plates and the first clamping plates are spaced apart, the first heating plates are distributed in the same plane and the height of the plane is spaced apart from the support height of the top frame.

[0011] Further technical solution: A second mounting bracket is fixedly installed on the surface of the second movable plate close to the mounting ring, a horizontal plate is slidably installed on the second mounting bracket, multiple groups of second heating plates are provided and fixedly installed on the horizontal plate, and the protruding structures of the second heating plates and the first clamping plate are spaced apart.

[0012] Further technical solution: A third movable plate is provided on the base, the third movable plate contacts the base through a roller, the third movable plate is located between the mounting ring and the second movable plate, the second movable plate is connected to the third movable plate, a third heating plate is fixedly installed on the top of the third movable plate, the height of the third heating plate is the same as that of the first heating plate, a third telescopic member is fixedly installed on the top of the third movable plate, a first support frame is fixedly installed on the output end of the third telescopic member, and the first support frame passes through the third heating plate when moving upward.

[0013] Further technical solution: A first connecting plate is fixedly installed on the second movable plate, the first connecting plate passes through the third movable plate, a second permanent magnet is fixedly installed on the end of the first connecting plate away from the second movable plate, and the second permanent magnet is adsorbed on the third movable plate.

[0014] Further technical solution: a fourth movable plate and a fifth movable plate are provided on the base, and the fourth movable plate and the fifth movable plate are both in contact with the base through rollers, and a second connecting plate is fixedly installed on the side of the third movable plate, the second connecting plate passes through the fourth movable plate and is slidably connected to the fourth movable plate, a second support frame is fixedly installed on the fourth movable plate, and the height of the second support frame is located between the third heating plate and the first support rod, and a fourth telescopic member is fixedly installed on the fifth movable plate, and a U-shaped second pressure plate is fixedly installed on the output end of the fourth telescopic member, and a slot for the second pressure plate to pass through is opened on the second splint, and a third servo module that drives the fifth movable plate to move is provided on the base, and the third connecting plate is fixedly installed on the fifth movable plate, and the third connecting plate is slidably connected to the fourth movable plate, and a second support rod is rotatably installed on the base, and the second support frame is in rolling contact with the second support rod.

[0015] The present invention also provides a painting method, which is applied to the above-mentioned steel structure painting device, and comprises the following steps:

[0016] Step S1: The first pressing plate is driven by the first telescopic member to fix the end of the steel structure. The position of the slider is adjusted according to the structure of the steel structure so that the paint sprayed from the spray head can evenly cover the surface of the steel structure. Then, the first servo module drives the first movable plate to move toward the mounting ring, so that the steel structure moves horizontally and passes through the mounting ring for painting.

[0017] Step S2: When the end of the steel structure contacts the second movable plate, the second servo module drives the second movable plate to move synchronously with the first movable plate, and the paint on the upper and lower surfaces of the end of the steel structure is heated and dried by the first heating plate and the second heating plate;

[0018] Step S3: When the first movable plate moves close to the first support rod, the second telescopic member contracts to drive the second clamping plate to move downward, and the second clamping plate and the first clamping plate clamp the end of the steel structure, and then the position of the first clamping plate is fixed by the limit assembly;

[0019] Step S4: After the end of the steel structure is fixedly connected to the second movable plate, the first pressing plate is released from the fixation of the steel structure, the first movable plate stops moving, and the steel structure is pulled by the second movable plate to move and paint the subsequent area.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. Fix one end of the steel structure by the first movable plate and drive the steel structure to move for painting. During the process of moving and painting the steel structure, dry the painted end of the steel structure. Subsequently, fix the dried paint end of the steel structure by the second movable plate and continue to drive the steel structure to move for painting. The two ends of the steel structure are alternately fixed, so that the surface of the steel structure can be fully painted at one time, ensuring the uniformity and quality of the paint on the surface of the steel structure.

[0022] 2. When the first pressure plate releases the fixation on the end of the steel structure, the third telescopic member drives the first support frame to move upward and contact the lower surface of the steel structure, thereby supporting the steel structure from the middle of the steel structure through the third movable plate and the second support frame, thereby improving the stability of the steel structure during painting, and at the same time reducing the force of the first and second splints on the ends of the steel structure, reducing the probability of the paint on the ends of the steel structure being damaged, and reducing the probability of the steel structure bending and deformation, further improving the painting quality of the steel structure.

[0023] 3. The painted steel structure is fixedly supported by the second support frame and the second pressing plate, and the steel structure on the fourth movable plate and the fifth movable plate is placed for drying, ensuring that the painted steel structure can be unloaded immediately, realizing continuous painting operation of the steel structure and improving the painting efficiency of the steel structure. At the same time, the paint on the contact position between the second pressing plate and the second support frame and the steel structure is dried, avoiding the contact of undried paint with other structures during unloading, avoiding damage to the undried paint surface, and further ensuring the paint surface quality of the steel structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the overall structure of the present invention from the first perspective.

[0025] Figure 2 This is a schematic diagram of the overall structure of the second viewing angle of the present invention.

[0026] Figure 3 This is a schematic structural diagram of the second movable plate in the present invention from a first viewing angle.

[0027] Figure 4 This is a schematic structural diagram of the second movable plate in the present invention from a second viewing angle.

[0028] Figure 5 for Figure 4 A magnified schematic diagram of area A in the middle.

[0029] Figure 6 It is a structural schematic diagram of the third movable plate in the present invention.

[0030] Figure 7 It is a schematic cross-sectional structural diagram of the third movable plate in the present invention.

[0031] In the accompanying drawings: 1. base; 2. first movable plate; 3. first servo module; 4. top frame; 5. first telescopic member; 6. first pressure plate; 7. mounting ring; 8. slider; 9. nozzle; 10. first support rod; 11. second movable plate; 12. second servo module; 13. groove; 14. first mounting frame; 15. first clamping plate; 16. second clamping plate; 17. second telescopic member; 18. limiting groove; 19. limiting plate; 20. elastic member; 21. first permanent magnet; 22. electromagnet; 23. first heating element Plate; 24, second mounting frame; 25, horizontal plate; 26, second heating plate; 27, card slot; 28, third movable plate; 29, third heating plate; 30, first connecting plate; 31, second permanent magnet; 32, first support frame; 33, third telescopic member; 34, fourth movable plate; 35, second support frame; 36, second connecting plate; 37, second support rod; 38, fifth movable plate; 39, third servo module; 40, fourth telescopic member; 41, second pressure plate; 42, third connecting plate; 43, limit assembly. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0033] The specific implementation of the present invention is described in detail below with reference to specific embodiments.

[0034] like Figure 1-Figure 5 As shown, a steel structure painting device provided by the present invention includes a base 1, a mounting ring 7 is fixedly mounted on the base 1, a plurality of sets of spaced sliders 8 are slidably mounted on the mounting ring 7, a nozzle 9 connected to an external paint supply device is fixedly mounted on the slider 8, a first movable plate 2 and a second movable plate 11 located on both sides of the mounting ring 7 are slidably mounted on the base 1, the first movable plate 2 and the second movable plate 11 are both in contact with the base 1 through rollers, a first servo module 3 and a second servo module 12 are provided on the base 1 to respectively drive the first movable plate 2 and the second movable plate 11 to move, a top frame 4 is fixedly mounted on the first movable plate 2, a first telescopic member 5 is fixedly mounted on the top frame 4, and a first pressing plate 6 is fixedly mounted on the output end of the first telescopic member 5, a first support rod 10 is rotatably mounted on the base 1 between the mounting ring 7 and the first movable plate 2, the support height of the top frame 4 to the steel structure is the same as the support height of the first support rod 10, and the first support rod 10 is arranged close to the mounting ring 7;

[0035] The second movable plate 11 is fixedly mounted with a first mounting bracket 14, and a first clamping plate 15 and a second clamping plate 16 are slidably mounted on the first mounting bracket 14. The second movable plate 11 is provided with a plurality of groups of spaced grooves 13, and the lower end height of the groove 13 is lower than the height of the first support rod 10. In the initial state, the first clamping plate 15 is located at the lower end of the groove 13 and the height of the first clamping plate 15 is lower than the height of the first support rod 10. The first clamping plate 15 and the second clamping plate 16 are both provided with a protruding structure extending into the groove 13 and passing through the second movable plate 11. A second telescopic member 17 is fixedly mounted on the first clamping plate 15, and the output end of the second telescopic member 17 is fixedly connected to the second clamping plate 16. The limiting component 43, the surface of the second movable plate 11 close to the mounting ring 7 is provided with a first heating plate 23 and a second heating plate 26 for heating and drying the upper and lower surfaces of the steel structure end, the first heating plate 23 is provided in multiple groups, the first heating plate 23 and the protruding structure of the first clamping plate 15 are spaced apart, the first heating plate 23 is located in the same plane and the height of the plane is spaced apart from the support height of the top frame 4, the second mounting frame 24 is fixedly installed on the surface of the second movable plate 11 close to the mounting ring 7, and a horizontal plate 25 is slidably installed on the second mounting frame 24, the second heating plate 26 is provided in multiple groups and fixedly installed on the horizontal plate 25, and the second heating plate 26 and the protruding structure of the first clamping plate 15 are spaced apart.

[0036] In actual application of this embodiment, in the initial state, the first movable plate 2 is away from the mounting ring 7, and the second movable plate 11 is close to the mounting ring 7. The steel structure to be painted is placed on the top frame 4 and the first support rod 10. The height of the cross plate 25 is adjusted according to the height of the steel structure so that the second heating plate 26 is at a set distance from the upper surface of the steel structure. At the same time, the first clamping plate 15 and the second clamping plate 16 are located on the upper and lower sides of the steel structure. The first telescopic member 5 drives the first pressing plate 6 to fix the end of the steel structure. The position of the slider 8 is adjusted according to the structure of the steel structure so that the paint sprayed by the spray head 9 can evenly cover the surface of the steel structure. Then, the first servo module 3 drives the first movable plate 2 to move in the direction close to the mounting ring 7, so that the steel structure moves horizontally and passes through the mounting ring 7 for painting. When the end of the steel structure contacts the second movable plate 11, the second servo module 12 drives the second movable plate 11 to move synchronously with the first movable plate 2. At this time, the end of the steel structure after painting is located between the first heating plate 23 and the second heating plate 26. The paint on the upper and lower surfaces of the end of the steel structure is heated and dried by the first heating plate 23 and the second heating plate 26.

[0037] When the first movable plate 2 moves close to the first support rod 10, the second telescopic member 17 contracts and drives the second clamping plate 16 to move downward. When the second clamping plate 16 contacts the upper surface of the steel structure, the first clamping plate 15 moves upward to contact and clamp the lower surface of the steel structure. The position clamped by the first clamping plate 15 and the second clamping plate 16 is the position where the paint on the end of the steel structure is dried. After that, the position of the first clamping plate 15 is fixed by the limit assembly 43, and the end of the steel structure can be fixedly connected to the second movable plate 11. At this time, the fixation of the steel structure by the first pressure plate 6 is released, the first movable plate 2 stops moving, and the steel structure can be pulled to move by the second movable plate 11. The subsequent areas are painted. When the steel structure completely passes through the mounting ring 7, the painting operation of the steel structure is completed. The steel structure is subsequently removed and the first movable plate 2 and the second movable plate 11 are reset. One end of the steel structure is fixed by the first movable plate 2 and the steel structure is driven to move for painting. During the movement and painting of the steel structure, the painted end of the steel structure is dried. Subsequently, the second movable plate 11 is used to fix the dried paint end of the steel structure and continue to drive the steel structure to move for painting, thereby realizing alternating fixation of the two ends of the steel structure, so that the surface of the steel structure can be fully painted at one time, ensuring the uniformity and quality of the paint on the surface of the steel structure.

[0038] In an example of this embodiment, the first telescopic member 5 and the second telescopic member 17 are respectively the first electric telescopic rod and the second electric telescopic rod. Of course, they can also be other components that can actively change the length, such as hydraulic cylinders. The first electric telescopic rod drives the first pressure plate 6 to move, and the second electric telescopic rod drives the second clamping plate 16 to move.

[0039] like Figure 4 、 Figure 5 As shown, a steel structure painting device provided by the present invention, the limiting assembly 43 includes a limiting plate 19, the limiting plate 19 is provided with multiple groups and is slidably installed on the first clamping plate 15, the second movable plate 11 is provided with a limiting groove 18 used in conjunction with the limiting plate 19, the end of the limiting plate 19 away from the second movable plate 11 is fixedly installed with a first permanent magnet 21, the first permanent magnet 21 is used in conjunction with an electromagnet 22 fixedly installed on the first clamping plate 15, the first permanent magnet 21 is fixedly installed with an elastic part 20 on the surface close to the first clamping plate 15, and the end of the elastic part 20 away from the first permanent magnet 21 is fixedly connected to the first clamping plate 15.

[0040] In actual application of this embodiment, after the first clamping plate 15 contacts the lower surface of the steel structure, the electromagnet 22 is energized. After being energized, the electromagnet 22 repels the first permanent magnet 21, thereby pushing the limit plate 19 to move and compressing the elastic member 20, so that the limit plate 19 enters the limit groove 18. At this time, the position of the first clamping plate 15 can be fixed, so that the first clamping plate 15 and the second clamping plate 16 can clamp and fix the steel structure. Subsequently, the electromagnet 22 is de-energized, and the limit plate 19 is reset under the action of the magnetic force of the elastic member 20 and the first permanent magnet 21. After that, the first clamping plate 15 can move downward to the bottom of the groove 13.

[0041] In an embodiment of the present invention, the elastic member 20 is a spring, and can also be other elastic members such as an elastic ball, and the spring applies a reset thrust to the limiting plate 19 .

[0042] like Figure 1-Figure 7 As shown, a steel structure painting device provided by the present invention is provided with a third movable plate 28 on the base 1, and the third movable plate 28 contacts the base 1 through a roller. The third movable plate 28 is located between the mounting ring 7 and the second movable plate 11, and the second movable plate 11 is connected to the third movable plate 28. A third heating plate 29 is fixedly installed on the top of the third movable plate 28. The height of the third heating plate 29 is the same as that of the first heating plate 23. A third telescopic member 33 is fixedly installed on the top of the third movable plate 28, and a first support frame 32 is fixedly installed on the output end of the third telescopic member 33. When the first support frame 32 moves upward, it passes through the third heating plate 29.

[0043] Specifically, a first connecting plate 30 is fixedly mounted on the second movable plate 11 , and the first connecting plate 30 passes through the third movable plate 28 . A second permanent magnet 31 is fixedly mounted on the end of the first connecting plate 30 away from the second movable plate 11 , and the second permanent magnet 31 is adsorbed on the third movable plate 28 .

[0044] When this embodiment is actually used, the second movable plate 11 moves, driving the first connecting plate 30 to move. When the second permanent magnet 31 contacts the third movable plate 28, it drives the third movable plate 28 to move synchronously. At this time, the paint on the corresponding position of the lower surface of the steel structure is dried by the third heating plate 29. When the first pressure plate 6 releases the fixation on the end of the steel structure, the third telescopic member 33 drives the first support frame 32 to move upward and contact the lower surface of the steel structure, thereby supporting the steel structure from the middle of the steel structure through the third movable plate 28 and the first support frame 32, thereby improving the stability of the steel structure during painting, and at the same time reducing the force of the first splint 15 and the second splint 16 on the end of the steel structure, reducing the probability of the paint on the end of the steel structure being damaged, and at the same time reducing the probability of the steel structure bending and deformation, further improving the painting quality of the steel structure.

[0045] In one embodiment of the present invention, the third telescopic member 33 is a third electric telescopic rod, and of course it can also be other components that can actively change the length, such as a hydraulic cylinder, and the first support frame 32 is driven to move up and down by the third electric telescopic rod.

[0046] like Figure 1 、 Figure 2 As shown, a steel structure painting device provided by the present invention is provided with a fourth movable plate 34 and a fifth movable plate 38 on the base 1. The fourth movable plate 34 and the fifth movable plate 38 are both in contact with the base 1 through rollers. A second connecting plate 36 is fixedly installed on the side of the third movable plate 28. The second connecting plate 36 passes through the fourth movable plate 34 and is slidably connected to the fourth movable plate 34. A second support frame 35 is fixedly installed on the fourth movable plate 34. The second support frame 35 is located at a height between the third heating plate 29 and the first support rod 10. The fifth movable plate 28 is fixed with a second connecting plate 36. A fourth telescopic member 40 is fixedly mounted on the movable plate 38, a U-shaped second pressure plate 41 is fixedly mounted on the output end of the fourth telescopic member 40, and a slot 27 for the second pressure plate 41 to pass through is provided on the second clamping plate 16, a third servo module 39 for driving the fifth movable plate 38 to move is provided on the base 1, a third connecting plate 42 is fixedly mounted on the fifth movable plate 38, the third connecting plate 42 is slidingly connected to the fourth movable plate 34, a second support rod 37 is rotatably mounted on the base 1, and the second support frame 35 is in rolling contact with the second support rod 37.

[0047] After the second support frame 35 is in the first position, the second support frame 35 is in the first position, and the second support frame 35 is in the second position, so that the second support frame 35 and the second support frame 35 are in the first position. When the second support frame 32 is in contact with the second pressing plate 41, the paint on the contact position between the second pressing plate 41 and the second support frame 35 is dried, thereby avoiding the contact of the undried paint with other structures during unloading, avoiding the damage of the undried paint surface, and further ensuring the paint surface quality of the steel structure.

[0048] In one embodiment of the present invention, the fourth telescopic member 40 is a fourth electric telescopic rod, and of course it can also be other components that can actively change the length, such as a hydraulic cylinder, and the second pressing plate 41 is driven to move up and down by the fourth electric telescopic rod.

[0049] like Figures 1-6 As shown, the present invention provides a painting method, which is applied to the above-mentioned steel structure painting device, and includes the following steps:

[0050] Step S1: The first pressing plate 6 is driven by the first telescopic member 5 to fix the end of the steel structure. The position of the slider 8 is adjusted according to the structure of the steel structure so that the paint sprayed by the spray head 9 can evenly cover the surface of the steel structure. Then, the first servo module 3 drives the first movable plate 2 to move toward the mounting ring 7, so that the steel structure moves horizontally and passes through the mounting ring 7 for painting.

[0051] Step S2: When the end of the steel structure contacts the second movable plate 11, the second servo module 12 drives the second movable plate 11 to move synchronously with the first movable plate 2, and the paint on the upper and lower surfaces of the end of the steel structure is heated and dried by the first heating plate 23 and the second heating plate 26;

[0052] Step S3: When the first movable plate 2 moves close to the first support rod 10, the second telescopic member 17 contracts to drive the second clamping plate 16 to move downward, and the second clamping plate 16 and the first clamping plate 15 clamp the end of the steel structure. Then, the position of the first clamping plate 15 is fixed by the limit assembly 43;

[0053] Step S4: After the end of the steel structure is fixedly connected to the second movable plate 11, the first pressing plate 6 is released from the fixation of the steel structure, the first movable plate 2 stops moving, and the steel structure is pulled by the second movable plate 11 to move and paint the subsequent area.

[0054] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

[0055] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A method for painting a steel structure, characterized in that: A painting device for a steel structure is applied, the painting device comprising a base (1), a mounting ring (7) fixedly mounted on the base (1), a plurality of spaced sliders (8) slidably mounted on the mounting ring (7), a nozzle (9) connected to an external paint supply device fixedly mounted on the slider (8), a first movable plate (2) and a second movable plate (11) located on both sides of the mounting ring (7) slidably mounted on the base (1), the two ends of the steel structure are alternately fixed by the first movable plate (2) and the second movable plate (11), a first servo module (3) and a second servo module (12) are provided on the base (1) for driving the first movable plate (2) and the second movable plate (11) to move respectively, a top frame (4) fixedly mounted on the first movable plate (2), a first telescopic member (5) fixedly mounted on the top frame (4), and a first pressing plate (6) fixedly mounted on the output end of the first telescopic member (5), and a first support rod (10) rotatably mounted on the base (1) between the mounting ring (7) and the first movable plate (2); A first mounting frame (14) is fixedly mounted on the second movable plate (11), a first clamping plate (15) and a second clamping plate (16) are slidably mounted on the first mounting frame (14), a plurality of groups of spaced grooves (13) are provided on the second movable plate (11), the first clamping plate (15) and the second clamping plate (16) are both provided with a protruding structure extending into the groove (13) and penetrating the second movable plate (11), a second telescopic member (17) is fixedly mounted on the first clamping plate (15), an output end of the second telescopic member (17) is fixedly connected to the second clamping plate (16), a limiting assembly (43) is provided on the first clamping plate (15), and a first heating plate (23) and a second heating plate (26) for heating and drying the upper and lower surfaces of the end portion of the steel structure are provided on the surface of the second movable plate (11) close to the mounting ring (7); The painting method comprises the following steps: Step S1: The first pressing plate (6) is driven by the first telescopic member (5) to fix the end of the steel structure, and the position of the slider (8) is adjusted according to the structure of the steel structure so that the paint sprayed by the spray head (9) can evenly cover the surface of the steel structure. Then, the first servo module (3) drives the first movable plate (2) to move in a direction close to the mounting ring (7), so that the steel structure moves horizontally and passes through the mounting ring (7) for spraying paint; Step S2: When the end of the steel structure contacts the second movable plate (11), the second servo module (12) drives the second movable plate (11) and the first movable plate (2) to move synchronously, and the paint on the upper and lower surfaces of the end of the steel structure is heated and dried by the first heating plate (23) and the second heating plate (26); Step S3: When the first movable plate (2) moves close to the first support rod (10), the second telescopic member (17) contracts to drive the second clamping plate (16) to move downward, and the end of the steel structure is clamped by the second clamping plate (16) and the first clamping plate (15), and then the position of the first clamping plate (15) is fixed by the limit assembly (43); Step S4: After the end of the steel structure is fixedly connected to the second movable plate (11), the first pressing plate (6) is released from fixing the steel structure, the first movable plate (2) stops moving, and the steel structure is pulled by the second movable plate (11) to move and spray paint the subsequent area.

2. A method for painting a steel structure according to claim 1, characterized in that: The support height of the top frame (4) for the steel structure is the same as the support height of the first support rod (10), and the first support rod (10) is arranged close to the mounting ring (7).

3. A method for painting a steel structure according to claim 1, characterized in that: The height of the lower end of the groove (13) is lower than the height of the first support rod (10); in the initial state, the first clamping plate (15) is located at the lowermost end of the groove (13) and the height of the first clamping plate (15) is lower than the height of the first support rod (10).

4. A method for painting a steel structure according to claim 1, characterized in that: The limiting assembly (43) includes a limiting plate (19), which is provided with multiple groups and is slidably mounted on the first clamping plate (15). The second movable plate (11) is provided with a limiting groove (18) for use with the limiting plate (19). The end of the limiting plate (19) away from the second movable plate (11) is fixedly mounted with a first permanent magnet (21). The first permanent magnet (21) is used in conjunction with an electromagnet (22) fixedly mounted on the first clamping plate (15). An elastic member (20) is fixedly mounted on the surface of the first permanent magnet (21) close to the first clamping plate (15), and one end of the elastic member (20) away from the first permanent magnet (21) is fixedly connected to the first clamping plate (15).

5. A method for painting a steel structure according to claim 1, characterized in that: The first heating plates (23) are provided in multiple groups, the first heating plates (23) and the protruding structures of the first clamping plate (15) are spaced apart, the first heating plates (23) are located in the same plane, and the height of the plane is spaced apart from the support height of the top frame (4).

6. A method for painting a steel structure according to claim 1, characterized in that: A second mounting frame (24) is fixedly mounted on the surface of the second movable plate (11) close to the mounting ring (7), a transverse plate (25) is slidably mounted on the second mounting frame (24), a plurality of second heating plates (26) are provided and fixedly mounted on the transverse plate (25), and the second heating plates (26) are spaced apart from the protruding structures of the first clamping plate (15).

7. A method for painting a steel structure according to claim 1, characterized in that: A third movable plate (28) is provided on the base (1), the third movable plate (28) contacts the base (1) via a roller, the third movable plate (28) is located between the mounting ring (7) and the second movable plate (11), the second movable plate (11) is connected to the third movable plate (28), a third heating plate (29) is fixedly mounted on the top of the third movable plate (28), the height of the third heating plate (29) is the same as that of the first heating plate (23), a third telescopic member (33) is fixedly mounted on the top of the third movable plate (28), a first support frame (32) is fixedly mounted on the output end of the third telescopic member (33), and the first support frame (32) passes through the third heating plate (29) when moving upward.

8. A method for painting a steel structure according to claim 7, characterized in that: A first connecting plate (30) is fixedly mounted on the second movable plate (11), the first connecting plate (30) passes through the third movable plate (28), a second permanent magnet (31) is fixedly mounted on the end of the first connecting plate (30) away from the second movable plate (11), and the second permanent magnet (31) is adsorbed on the third movable plate (28).

9. A method for painting a steel structure according to claim 7, characterized in that: The base (1) is provided with a fourth movable plate (34) and a fifth movable plate (38), both of which are in contact with the base (1) via rollers, a second connecting plate (36) is fixedly mounted on the side of the third movable plate (28), the second connecting plate (36) passes through the fourth movable plate (34) and is slidably connected to the fourth movable plate (34), a second support frame (35) is fixedly mounted on the fourth movable plate (34), the second support frame (35) is located at a height between the third heating plate (29) and the first support rod (10), and a second connecting plate (36) is fixedly mounted on the fifth movable plate (38). A fourth telescopic member (40) is provided, a U-shaped second pressing plate (41) is fixedly mounted on the output end of the fourth telescopic member (40), and a slot (27) for the second pressing plate (41) to pass through is provided on the second clamping plate (16), a third servo module (39) for driving the fifth movable plate (38) to move is provided on the base (1), a third connecting plate (42) is fixedly mounted on the fifth movable plate (38), the third connecting plate (42) is slidably connected to the fourth movable plate (34), a second support rod (37) is rotatably mounted on the base (1), and the second support frame (35) is in rolling contact with the second support rod (37).

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