Bridge steel structure coating auxiliary device and use method thereof

Abstract

The application relates to the field of coating technology, and discloses a bridge steel structure coating auxiliary device and a use method thereof, wherein the bridge steel structure coating auxiliary device comprises a mounting plate, a spraying gun and a box body, fixed mounting plates are arranged at the bottom of the mounting plate, a same rack is fixedly connected to the side of the two fixed mounting plates which are close to each other, the box body is slidingly sleeved outside the rack, a fixed shaft is fixedly installed at the bottom of one side of the box body, a connecting plate is fixedly installed at the top of the spraying gun, the connecting plate is rotatably sleeved outside the fixed shaft, a transverse hole is formed in the other side of the box body, and a horizontal shaft is rotatably installed in the transverse hole. The application has the advantages that the spraying gun is driven to swing forward and backward quickly and move horizontally at the same time, the bridge steel structure is uniformly and quickly sprayed, the spraying quality and efficiency are improved, the spraying waste gas is guided into the air cylinder to be filtered and purified by driving the fan blades to rotate, and the environmental pollution caused by the spraying work is reduced.

Description

Technical Field

[0001] This invention relates to the field of coating technology, and in particular to an auxiliary device for coating bridge steel structures and its usage method. Background Technology

[0002] A steel-structure bridge is a bridge whose load-bearing structure is made of steel. Steel components refer to composite steel structural members made of steel plates, angle steel, channel steel, I-beams, welded steel, or hot-rolled H-beams that are cold-bent or welded and connected by connectors to bear and transfer loads. With economic development, the construction of urban steel-structure bridges is booming. During the production and processing of bridge steel structures, painting is required. Painting is a crucial step in the steel structure manufacturing process. The quality of rust-proof and corrosion-proof coatings is a significant aspect of steel structure quality. The appearance quality of the product not only reflects its protective performance but is also a crucial factor in its value. Chinese patent application publication number CN111408501A discloses an auxiliary device for painting bridge steel structures. It utilizes a main servo motor to drive a main screw to rotate. Through the threaded engagement of the main screw and the main slider, a mounting plate moves towards a fixed clamping plate. This causes the grinding and spraying mechanism above the mounting plate to move from one end of the steel structure to the other. During the contact between the grinding and spraying mechanism and the bottom of the steel structure, the grinding plate first contacts the bottom of the steel structure to grind it. Then, the spraying plate contacts the bottom of the steel structure, and paint is delivered to the bottom of the steel structure using an external hose connected to an external spraying device. This allows for grinding of the bottom of the steel structure before painting, improving the painting effect.

[0003] In existing technologies, bridge steel structures are usually painted manually, which results in low efficiency, poor coating uniformity, and significant pollution due to the inability to clean up the spraying exhaust. In addition, existing spraying institutions have a single spraying mode and are prone to spraying blind spots.

[0004] Therefore, we propose an auxiliary device for painting bridge steel structures and its usage method to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies that typically employ manual methods for painting bridge steel structures, resulting in low efficiency, poor spray uniformity, and significant pollution during the spraying process due to the inability to clean up spray exhaust gases. Therefore, this invention proposes an auxiliary device for painting bridge steel structures and its usage method.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A bridge steel structure painting auxiliary device includes a mounting plate, a spray gun, and a housing. Fixing plates are fixedly mounted on both sides of the bottom of the mounting plate. A common rack is fixedly connected to the side of the two fixing plates that are close to each other. The housing is slidably sleeved on the outside of the rack. A fixed shaft is fixedly mounted on the bottom of one side of the housing. A connecting plate is fixedly mounted on the top of the spray gun and rotatably sleeved on the outside of the fixed shaft. A limiting plate is fixedly mounted on one end of the fixed shaft. The thickness of the connecting plate is less than the length of the fixed shaft. A spring is provided between the limiting plate and the connecting plate, and the spring is sleeved on the fixed shaft. A transverse hole is opened on the other side of the housing, and a transverse shaft is rotatably mounted in the transverse hole, located inside the housing. One end is fixedly mounted with a first gear. A straight groove is opened on one side of the first gear. The straight groove passes through the rotation axis of the first gear. A round shaft is slidably supported in the straight groove. The round shaft is an electrically controlled telescopic column. A second motor is installed in the straight groove to push the round shaft to move radially. A sliding plate is rotatably sleeved on the outside of the round shaft. A groove is opened on one side of the connecting plate. The sliding plate is slidably connected to the groove. The radial position of the round shaft in the straight groove is adjusted differently in swing mode and fixed mode. In the fixed mode, the round shaft is located at the rotation center of the first gear. In the swing mode, the round shaft is located off the center, and the extension and retraction length of the round shaft is different in different reciprocating strokes of the paint spraying.

[0008] A first motor is fixedly installed on the inner wall of the other side of the housing. One end of a worm gear is fixedly connected to the output shaft of the first motor, and a second gear is fixedly installed on the other end of the worm gear. The first gear and the second gear mesh with each other. The same connecting shaft is rotatably installed on the inner walls of the front and rear sides of the housing. A third gear and a worm wheel are fixedly installed on the connecting shaft. The worm wheel meshes with the worm gear, and the third gear meshes with the rack. One end of a connecting rod is fixedly connected to the bottom and the other side of the housing. A fan duct is fixedly installed on the other end of both connecting rods. The bottom of the fan duct is open. A through hole is opened on the inner wall of one side of the fan duct. A frame is fixedly installed in the through hole. A filter screen is placed in the frame. The other end of the horizontal shaft extends into the frame and is fixedly installed with a first fan blade. Two horizontal plates are fixedly installed on the inner wall of the other side of the fan duct. The same rotating shaft is rotatably installed on the side of the two horizontal plates that are close to each other. Multiple second fan blades are fixedly installed on the rotating shaft. Bevel gears are fixedly installed on the top of the rotating shaft and the horizontal shaft. The two bevel gears mesh with each other.

[0009] Preferably, the mounting plate has circular grooves at all four corners of its bottom, and assembly holes are provided on the inner walls of the top of each of the four circular grooves to facilitate the installation and fixing of the mounting plate.

[0010] Preferably, the frame has threaded holes at the top and bottom, and threaded rods are threaded into the two threaded holes. The two threaded rods are respectively in contact with the top and bottom of the filter screen, which facilitates fixing and releasing the filter screen.

[0011] Preferably, a limiting plate is fixedly installed at one end of the fixed shaft, and the limiting plate movably abuts against the other side of the connecting plate to limit the lateral movement of the connecting plate.

[0012] Preferably, the same crossbeam is fixedly installed on one side of the two fixed plates that are close to each other, and the box body is slidably sleeved on the outside of the crossbeam to guide the lateral movement of the box body.

[0013] Preferably, multiple brackets are fixedly installed on the inner wall of the top of the box, and each bracket has a roller rotatably installed inside it. The rollers are all rolledly connected to the top of the crossbeam to support the box and reduce frictional resistance during lateral movement.

[0014] Preferably, a positioning plate is fixedly installed on the inner wall of the bottom of the box, and the positioning plate is rotatably sleeved on the outside of the horizontal shaft to rotate and position the horizontal shaft.

[0015] The present invention also provides a method for using a bridge steel structure painting auxiliary device, comprising the following steps:

[0016] S1: Secure the mounting plate onto the drive mechanism through the mounting holes, then start the drive mechanism to move the mounting plate to the working position;

[0017] S2: When oscillating mode spraying is required, the second motor is started to move the circular shaft away from the center in the linear chute. The spray gun and the first motor are then turned on, and the spray gun sprays the bridge steel structure. The output shaft of the first motor drives the worm gear to rotate, which in turn drives the second gear to rotate. The second gear then drives the first gear to rotate, which in turn drives the circular shaft and the sliding plate to perform circular motion around the horizontal axis. The sliding plate, through its sliding engagement with the chute, drives the connecting plate to rotate back and forth around the fixed axis. The connecting plate drives the spray gun to oscillate back and forth, thus uniformly spraying the front and rear positions. When static mode spraying is required, the radial direction of the circular shaft is controlled. When the gear moves to the center of the first gear, it cannot drive the connecting plate to swing while the first gear drives the circular shaft and the slide plate to rotate. The worm rotates while driving the worm wheel to rotate slowly. The worm wheel drives the third gear to rotate through the connecting shaft. The third gear drives the housing to move laterally through meshing with the rack. The housing drives the spray gun to swing back and forth while moving slowly laterally, thereby spraying different positions laterally, improving the efficiency and quality of spraying. During the reciprocating stroke, the circular shaft is controlled to extend or shorten, so that the connecting plate slides back and forth on the fixed shaft, so that the spraying trajectory of the spray gun is different from that of the previous stroke, eliminating blind spots in spraying.

[0018] S3: The first gear rotates while driving the horizontal shaft to rotate. The horizontal shaft drives the rotating shaft to rotate through the transmission between the two bevel gears. The rotating shaft drives the second fan blade to rotate, thereby drawing the spraying exhaust gas into the air duct through the bottom of the air duct. The horizontal shaft rotates while driving the first fan blade to rotate, thereby guiding the spraying exhaust gas in the air duct into the frame. The filter screen filters and purifies the spraying exhaust gas, thereby reducing the pollution generated by the spraying work.

[0019] S4: The first motor is turned off to complete the spraying work. By rotating the threaded rod, and through the threaded engagement of the two threaded rods with the corresponding threaded holes, the two threaded rods are driven to move to the side away from each other, thereby releasing the fixation of the filter screen, so as to facilitate the disassembly and cleaning of the filter screen.

[0020] Compared with the prior art, the present invention provides a bridge steel structure coating auxiliary device and its usage method, which has the following beneficial effects:

[0021] (1) By driving the spray gun to swing back and forth quickly while moving laterally, the spray gun rotates to evenly spray the front and back positions, and by driving the spray gun to move to one side, the different lateral positions of the bridge steel structure are sprayed quickly and evenly, thus improving the quality and efficiency of the spraying work.

[0022] (2) By driving the fan blades to rotate, the suction force is generated to guide the spraying exhaust gas into the air duct for filtration and purification, which prevents the diffusion of the spraying exhaust gas and reduces the environmental pollution caused by the spraying work.

[0023] (3) By disassembling the filter screen, it is easy to replace and clean the filter screen, which is conducive to continuous use.

[0024] (4) In this invention, the retractable and eccentric or non-eccentric cylinder allows for switching between swing mode and static mode in the painting mode. The cylinder of different lengths in different strokes ensures that the painting trajectory will not completely overlap in different round trips, thereby preventing painting blind spots.

[0025] This invention is reasonably designed. By driving the spray gun to swing back and forth rapidly while moving laterally, it can quickly and evenly spray the bridge steel structure, improving the quality and efficiency of the spraying work. By driving the fan blades to rotate, the spraying exhaust gas is introduced into the air duct for filtration and purification, reducing the environmental pollution generated by the spraying work. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of a bridge steel structure coating auxiliary device proposed in this invention;

[0027] Figure 2 This is a cross-sectional view of a bridge steel structure painting auxiliary device proposed in this invention;

[0028] Figure 3 This is a schematic diagram of part A of a bridge steel structure painting auxiliary device proposed in this invention;

[0029] Figure 4 This is a schematic diagram of part B of a bridge steel structure painting auxiliary device proposed in this invention;

[0030] Figure 5 This is a left view of the connecting plate, slide, circular shaft, sliding plate, and fixed shaft proposed in this invention.

[0031] In the diagram: 1. Mounting plate; 2. Spray gun; 3. Housing; 4. Connecting rod; 5. Air duct; 6. Fixing plate; 7. Rack; 8. Crossbeam; 9. Connecting plate; 10. Frame; 11. First gear; 12. Second gear; 13. First motor; 14. Worm gear; 15. Connecting shaft; 16. Worm wheel; 17. Third gear; 18. Slide groove; 19. Round shaft; 20. Slide plate; 21. Fixing shaft; 22. Horizontal shaft; 23. First fan blade; 24. Horizontal plate; 25. Rotating shaft; 26. Second fan blade; 27. Bevel gear; 28. Positioning plate; 29. ​​Filter screen; 30. Threaded rod; 31. Bracket; 32. Roller; 33. Limiting plate; 34. Assembly hole. Detailed Implementation

[0032] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0033] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0034] Reference Figure 1-5A bridge steel structure painting auxiliary device includes a mounting plate 1, a spray gun 2, and a housing 3. Fixing plates 6 are fixedly mounted on both sides of the bottom of the mounting plate 1. A rack 7 is fixedly connected to the side of the two fixing plates 6 that are close to each other. The housing 3 is slidably sleeved on the outside of the rack 7. A fixing shaft 21 is fixedly mounted on the bottom of one side of the housing 3. A connecting plate 9 is fixedly mounted on the top of the spray gun 2. The connecting plate 9 is rotatably sleeved on the outside of the fixing shaft 21. A limiting plate 33 is fixedly mounted on one end of the fixing shaft 21. The thickness of the connecting plate 9 is less than the length of the fixing shaft 21. A spring is provided between the limiting plate 33 and the connecting plate 9, and the spring is sleeved on the fixing shaft 21. A transverse hole is opened on the other side of the housing 3, and a transverse shaft 22 is rotatably mounted in the transverse hole. The transverse shaft 22 is located inside the housing 3. One end of the device is fixedly mounted with a first gear 11. A straight groove is formed on one side of the first gear 11, passing through the rotation axis of the first gear 11. A circular shaft 19 is slidably supported in the straight groove. The circular shaft 19 is an electrically controlled telescopic column. A second motor is installed in the straight groove to push the circular shaft 19 to move radially. A sliding plate 20 is rotatably sleeved on the outside of the circular shaft 19. A groove 18 is formed on one side of the connecting plate 9. The sliding plate 20 is slidably connected to the groove 18. The radial position of the circular shaft 19 in the straight groove is adjusted differently in swing mode and fixed mode. In the fixed mode, the circular shaft 19 is located at the rotation center of the first gear 11. In the swing mode, the circular shaft 19 is located off the center, and the extension length of the circular shaft 19 is different in different reciprocating strokes during the painting process.

[0035] A first motor 13 is fixedly installed on the inner wall of the other side of the housing 3. One end of a worm gear 14 is fixedly connected to the output shaft of the first motor 13. A second gear 12 is fixedly installed on the other end of the worm gear 14. The first gear 11 and the second gear 12 mesh with each other. The same connecting shaft 15 is rotatably installed on the inner walls of the front and rear sides of the housing 3. A third gear 17 and a worm wheel 16 are fixedly installed on the connecting shaft 15. The worm wheel 16 meshes with the worm gear 14, and the third gear 17 meshes with the rack 7. One end of a connecting rod 4 is fixedly connected to the bottom and the other side of the housing 3. The other ends of the two connecting rods 4 are also fixedly connected. A fan duct 5 is fixedly installed. The bottom of the fan duct 5 is open. A through hole is opened on the inner wall of one side of the fan duct 5. A frame 10 is fixedly installed in the through hole. A filter screen 29 is placed in the frame 10. The other end of the horizontal shaft 22 extends into the frame 10 and is fixedly installed with a first fan blade 23. Two horizontal plates 24 are fixedly installed on the inner wall of the other side of the fan duct 5. The same rotating shaft 25 is rotatably installed on the side of the two horizontal plates 24 that are close to each other. Multiple second fan blades 26 are fixedly installed on the rotating shaft 25. Bevel gears 27 are fixedly installed on the top of the rotating shaft 25 and on the horizontal shaft 22. The two bevel gears 27 mesh with each other.

[0036] In this embodiment, the mounting plate 1 has circular grooves at the four corners of its bottom, and assembly holes 34 are provided on the inner walls of the top of the four circular grooves to facilitate the installation and fixing of the mounting plate 1.

[0037] In this embodiment, threaded holes are provided at the top and bottom of the frame 10, and threaded rods 30 are threadedly installed in both threaded holes. The two threaded rods 30 are respectively in contact with the top and bottom of the filter screen 29, which facilitates fixing and releasing the filter screen 29.

[0038] In this embodiment, the limiting plate 33 is in contact with the other side of the connecting plate 9 to limit the lateral movement of the connecting plate 9.

[0039] In this embodiment, the same crossbeam 8 is fixedly installed on one side of the two fixed plates 6 that are close to each other, and the box body 3 is slidably sleeved on the outside of the crossbeam 8 to guide the lateral movement of the box body 3.

[0040] In this embodiment, multiple brackets 31 are fixedly installed on the inner wall of the top of the box 3. Each bracket 31 has a roller 32 rotatably installed inside it. The rollers 32 are all rolledly connected to the top of the crossbeam 8 to support the box 3 and reduce the frictional resistance during lateral movement.

[0041] In this embodiment, a positioning plate 28 is fixedly installed on the inner wall of the bottom of the box 3. The positioning plate 28 is rotatably sleeved on the outside of the horizontal shaft 22 to rotate and position the horizontal shaft 22.

[0042] This embodiment also provides a method for using a bridge steel structure painting auxiliary device, including the following steps:

[0043] S1: Fix the mounting plate 1 onto the drive mechanism through the mounting hole 34, and then start the drive mechanism to move the mounting plate 1 to the working position;

[0044] S2: When oscillating mode spraying is required, the second motor is started to move the circular shaft 19 away from the center in the linear slide. The spray gun 2 and the first motor 13 are turned on, and the spray gun 2 sprays the bridge steel structure. The output shaft of the first motor 13 drives the worm gear 14 to rotate, the worm gear 14 drives the second gear 12 to rotate, the second gear 12 drives the first gear 11 to rotate, and the first gear 11 drives the circular shaft 19 and the slide plate 20 to perform circular motion around the axis of the horizontal axis 22. The slide plate 20 drives the connecting plate 9 to rotate back and forth around the fixed axis 21 through sliding cooperation with the slide 18. The connecting plate 9 drives the spray gun 2 to oscillate back and forth, thereby spraying evenly on the front and back positions. When static mode spraying is required, the control is... When the circular shaft 19 moves radially to the center of the first gear 11, the first gear 11 cannot drive the connecting plate 9 to swing during the rotation of the circular shaft 19 and the slide plate 20. While the worm gear 14 rotates, it drives the worm wheel 16 to rotate slowly. The worm wheel 16 drives the third gear 17 to rotate through the connecting shaft 15. The third gear 17 drives the housing 3 to move laterally through meshing with the rack 7. The housing 3 drives the spray gun 2 to swing back and forth while moving slowly laterally, thereby spraying different positions laterally, improving the efficiency and quality of spraying. During the reciprocating stroke, the circular shaft 19 is controlled to extend or shorten, so that the connecting plate 9 slides back and forth on the fixed shaft 21, so that the spraying trajectory of the spray gun 2 is different from that of the previous stroke.

[0045] S3: When the first gear 11 rotates, it drives the horizontal shaft 22 to rotate. The horizontal shaft 22 drives the rotating shaft 25 to rotate through the transmission between the two bevel gears 27. The rotating shaft 25 drives the second fan blade 26 to rotate, thereby drawing the spraying exhaust gas into the air duct 5 through the bottom of the air duct 5. When the horizontal shaft 22 rotates, it drives the first fan blade 23 to rotate, thereby guiding the spraying exhaust gas in the air duct 5 into the frame 10. The filter screen 29 filters and purifies the spraying exhaust gas, thereby reducing the pollution generated by the spraying work.

[0046] S4: The first motor 13 is turned off to complete the spraying work. By rotating the threaded rod 30, and through the threaded engagement of the two threaded rods 30 with the corresponding threaded holes, the two threaded rods 30 are driven to move to the side away from each other, thereby releasing the fixation of the filter screen 29, so as to facilitate the disassembly and cleaning of the filter screen 29.

[0047] Therefore, the present invention uses a retractable cylinder that can be set eccentrically or non-eccentrically, which allows for switching between swing mode and static mode in the painting mode to adapt to different painting modes. Furthermore, the cylinder of different lengths in different strokes ensures that the painting trajectories do not completely overlap in different round trips, thereby preventing painting blind spots.

[0048] All standard parts used in this invention can be purchased from the market, and irregular parts can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art, and the circuit connection adopts conventional connection methods in the prior art, which will not be described in detail here.

Claims

1. A bridge steel structure painting auxiliary device, comprising a mounting plate (1), a spray gun (2), and a housing (3), characterized in that, The mounting plate (1) has two fixed plates (6) fixedly installed on both sides of its bottom. The two fixed plates (6) are fixedly connected to the same rack (7) on the side that is close to each other. The housing (3) is slidably sleeved on the outside of the rack (7). A fixed shaft (21) is fixedly installed on the bottom of one side of the housing (3). A connecting plate (9) is fixedly installed on the top of the spray gun (2). The connecting plate (9) is rotatably sleeved on the outside of the fixed shaft (21). A limiting plate (33) is fixedly installed on one end of the fixed shaft (21). The thickness of the connecting plate (9) is less than the length of the fixed shaft (21). A spring is provided between the limiting plate (33) and the connecting plate (9). The spring is sleeved on the fixed shaft (21). A transverse hole is opened on the other side of the housing (3). A transverse shaft (22) is rotatably installed in the transverse hole. One end of the transverse shaft (22) is fixed inside the housing (3). A first gear (11) is installed, and a straight groove is opened on one side of the first gear (11). The straight groove passes through the rotation axis of the first gear (11). A round shaft (19) is slidably supported in the straight groove. The round shaft (19) is an electrically controlled telescopic column. A second motor is installed in the straight groove to push the round shaft (19) to move radially. A sliding plate (20) is rotatably sleeved on the outside of the round shaft (19). A groove (18) is opened on one side of the connecting plate (9). The sliding plate (20) is slidably connected to the groove (18). The radial position of the round shaft (19) in the straight groove is adjusted differently in the swing mode and the fixed mode. In the fixed mode, the round shaft (19) is located at the rotation center of the first gear (11). In the swing mode, the round shaft (19) is located off the center. The extension length of the round shaft (19) is different in different reciprocating strokes of the painting process. A first motor (13) is fixedly installed on the inner wall of the other side of the housing (3). One end of a worm gear (14) is fixedly connected to the output shaft of the first motor (13). A second gear (12) is fixedly installed on the other end of the worm gear (14). The first gear (11) meshes with the second gear (12). The same connecting shaft (15) is rotatably installed on the inner walls of the front and rear sides of the housing (3). A third gear (17) and a worm wheel (16) are fixedly installed on the connecting shaft (15). The worm wheel (16) meshes with the worm gear (14), and the third gear (17) meshes with the rack (7). One end of a connecting rod (4) is fixedly connected to the bottom and the other side of the housing (3). The other ends of the two connecting rods (4) are both A duct (5) is fixedly installed. The bottom of the duct (5) is open. A through hole is opened on one side of the inner wall of the duct (5). A frame (10) is fixedly installed in the through hole. A filter screen (29) is placed in the frame (10). The other end of the horizontal shaft (22) extends into the frame (10) and is fixedly installed with a first fan blade (23). Two horizontal plates (24) are fixedly installed on the other side of the inner wall of the duct (5). The same rotating shaft (25) is rotatably installed on the side of the two horizontal plates (24) that are close to each other. Multiple second fan blades (26) are fixedly installed on the rotating shaft (25). Bevel gears (27) are fixedly installed on the top of the rotating shaft (25) and on the horizontal shaft (22). The two bevel gears (27) mesh with each other.

2. The bridge steel structure painting auxiliary device according to claim 1, characterized in that, The mounting plate (1) has circular grooves at the four corners of its bottom, and assembly holes (34) are provided on the inner walls of the top of the four circular grooves.

3. The bridge steel structure painting auxiliary device according to claim 1, characterized in that, The frame (10) has threaded holes at the top and bottom, and threaded rods (30) are threaded into the two threaded holes. The two threaded rods (30) are respectively in contact with the top and bottom of the filter screen (29).

4. The bridge steel structure painting auxiliary device according to claim 1, characterized in that, The limiting plate (33) and the connecting plate (9) are in contact on the other side.

5. The bridge steel structure painting auxiliary device according to claim 1, characterized in that, Two fixed plates (6) are fixedly installed on the same crossbeam (8) on the side close to each other, and the box body (3) is slidably sleeved on the outside of the crossbeam (8).

6. The bridge steel structure painting auxiliary device according to claim 1, characterized in that, Multiple brackets (31) are fixedly installed on the inner wall of the top of the box (3). Each bracket (31) has a roller (32) rotatably installed inside it. The rollers (32) are all rotatably connected to the top of the crossbeam (8).

7. The bridge steel structure painting auxiliary device according to claim 1, characterized in that, A positioning plate (28) is fixedly installed on the inner wall of the bottom of the box (3), and the positioning plate (28) is rotatably sleeved on the outside of the horizontal shaft (22).

8. A method for using an auxiliary device for painting bridge steel structures, characterized in that, Includes the following steps: S1: Fix the mounting plate (1) onto the drive mechanism through the mounting hole (34), and then start the drive mechanism to move the mounting plate (1) to the working position; S2: When oscillating mode spraying is required, start the second motor to drive the circular shaft (19) to move away from the center in the straight slide, turn on the spray gun (2) and the first motor (13), the spray gun (2) sprays the bridge steel structure, the output shaft of the first motor (13) drives the worm (14) to rotate, the worm (14) drives the second gear (12) to rotate, the second gear (12) drives the first gear (11) to rotate, the first gear (11) drives the circular shaft (19) and the slide plate (20) based on the horizontal axis (2 2) The axis makes circular motion. The slide plate (20) drives the connecting plate (9) to rotate back and forth around the fixed shaft (21) through the sliding cooperation with the slide groove (18). The connecting plate (9) drives the spray gun (2) to swing back and forth, so as to spray evenly on the front and back positions. When static mode spraying is required, the circular shaft (19) is controlled to move radially to the center of the first gear (11). Then, the first gear (11) cannot drive the connecting plate (9) to swing during the rotation of the circular shaft (19) and the slide plate (20). While the worm (14) rotates, it drives the worm wheel (16) to rotate slowly. The worm wheel (16) drives the third gear (17) to rotate through the connecting shaft (15). The third gear (17) drives the housing (3) to move laterally through meshing with the rack (7). The housing (3) drives the spray gun (2) to swing back and forth while moving laterally slowly, so as to spray different positions laterally. During the reciprocating stroke, the circular shaft (19) is controlled to extend or shorten, so that the connecting plate (9) slides back and forth on the fixed shaft (21), so that the spray trajectory of the spray gun (2) is different from that of the previous stroke. S3: The first gear (11) rotates while driving the horizontal shaft (22) to rotate. The horizontal shaft (22) drives the rotating shaft (25) to rotate through the transmission between the two bevel gears (27). The rotating shaft (25) drives the second fan blade (26) to rotate, thereby drawing the spraying exhaust gas into the air duct (5) through the bottom of the air duct (5). The horizontal shaft (22) rotates while driving the first fan blade (23) to rotate, thereby guiding the spraying exhaust gas in the air duct (5) into the frame (10). The filter screen (29) filters and purifies the spraying exhaust gas, thereby reducing the pollution generated by the spraying work. S4: Turn off the first motor (13) to complete the spraying work. By rotating the threaded rod (30), and through the threaded engagement of the two threaded rods (30) with the corresponding threaded holes, the two threaded rods (30) are driven to move to the side away from each other, thereby releasing the fixation of the filter screen (29) so that the filter screen (29) can be disassembled and cleaned.

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