A painting device for large steel structures

By designing an adjustable paint rack and nozzle system, the problem that existing equipment is difficult to adapt to steel structures in different sizes is solved, flexible adjustment of the height and width of the paint rack and uniform movement of the paint carrier plate are achieved, and uneven painting and paint are solved. The problem of material waste improves the efficiency and accuracy of painting.

CN114345581BActive Publication Date: 2024-12-17BEIJING JINGHONG YUNTAI TECH CO LTD
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Patent Information

Application Number
CN202111625975.X
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2021-12-27
Publication Date
2024-12-17
Estimated Expiration
2041-12-27

AI Technical Summary

Technical Problem

Existing paint spraying equipment is difficult to adapt to steel structures of different heights and widths, resulting in uneven painting. If it is too wide, it cannot spray on both sides, and if it is too narrow, it will cause waste of paint.

Method used

A large-scale paint spraying device for steel structures is designed, including an adjustable paint rack and nozzle system. The height of the paint rack is adjusted by sliding latch, shaker, gear and spring mechanism, and the nozzle switch is controlled by adjusting screws and paddles to realize the paint rack. Flexible adjustment of height and width, and the uniform movement of the painted carrier plate is driven by rotating rollers and springs.

Benefits of technology

It realizes uniform painting of steel structures of different heights and widths, avoids waste of paint and improves painting efficiency and accuracy.

✦ Generated by Eureka AI based on patent content.

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Abstract

The invention discloses a paint spraying device for large steel structures, and relates to the field of steel structures. The paint spraying device for large steel structures has a paint spraying carrier plate slidably connected to the upper surface of the equipment platform, columns are fixedly connected to both sides of the equipment platform, paint spraying racks are slidably connected to the sides of the columns, a booster paint sprayer is arranged on the sides of the columns, and the output end of the booster paint sprayer is connected to the inside of the paint spraying rack through a hose, a fixed plate is fixedly connected to the top of two groups of columns, a rack is fixedly connected to the upper surface of the paint spraying rack, a nozzle is fixedly connected to the lower surface of the paint spraying rack, a control switch is rotatably connected to the outer surface of the top of the nozzle, sliding plates are slidably connected to both ends of the side of the paint spraying rack, an adjusting screw is connected to the internal thread of the sliding plate, a paddle is arranged on the inner side of the sliding plate, and the paddle is in contact with the outer surface of the control switch. The paint spraying device for large steel structures is convenient for adjusting the height and the width of the paint spraying rack, and is suitable for use with steel structures of different sizes.
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Description

Technical Field

[0001] The invention relates to the technical field of steel structures, in particular to a paint spraying device for large steel structures. Background Art

[0002] Steel structure, as a material with good physical properties, is widely used in the fields of construction and industrial production. The equipment constructed with steel structure has relatively high strength and toughness. However, due to its metallic properties, its surface is prone to oxidation during the experiment, causing the steel structure to rust. Therefore, it is usually painted on its surface.

[0003] In actual operation, many steel structures have different sizes, and it is troublesome to spray anti-rust paint on the top of the steel structure. Most of the painting equipment on the market cannot adapt well to the painting of steel structures of different heights. At the same time, when painting steel structures of different widths, it is easy for the two sides of the steel structure that is too wide to be unable to be sprayed, and for the steel structure that is too narrow, it is easy for the anti-rust paint to be "empty sprayed" and wasteful. Therefore, it is necessary to provide a large-scale steel structure spraying device to solve the above problems. Summary of the invention

[0004] 1. Technical issues to be resolved

[0005] In view of the deficiencies of the prior art, the present invention discloses a paint spraying device for a large steel structure to solve the problems raised in the above background technology.

[0006] (II) Technical solution

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions: A large-scale steel structure spray painting device, comprising an equipment platform, the upper surface of the equipment platform is slidably connected to a spray paint carrier, both sides of the equipment platform are fixedly connected to columns, two groups of columns are slidably connected to the opposite side of the spray paint rack, a group of columns is fixedly connected to the side of the booster spray paint machine, and the output end of the booster spray paint machine is connected to the inside of the spray paint rack through a hose;

[0008] The tops of the two groups of columns are fixedly connected with a fixing plate, the upper surface of the paint spraying rack is fixedly connected with a rack, the top of the rack is movably inserted in the inside of the fixing plate, the inside of the fixing plate is rotatably connected with a first gear, the side of the first gear is fixedly connected with a transmission shaft, the side of one group of columns is rotatably connected with a crank, the end of the transmission shaft away from the first gear is connected to the crank through a belt, the end of the crank extends to the inside of the column and the end of the crank is fixedly connected with a second gear, the front of the column is slidably inserted with a sliding latch, and the sliding latch is movably engaged with the second gear;

[0009] The two ends of the equipment platform are rotatably connected to the first rotating roller and the second rotating roller respectively, the lower surface of the paint carrier is fixedly connected to the slider, the interior of the equipment platform is fixedly connected to a guide rail, the outer surface of the guide rail and one end close to the second rotating roller is movably sleeved with a first spring, the outer surface of the first rotating roller is fixedly connected to a connecting rope, the end of the connecting rope away from the first rotating roller passes through the outer surface of the second rotating roller and the end of the connecting rope is fixedly connected to the slider;

[0010] A nozzle is fixedly connected to the lower surface of the paint spray rack, a control switch is rotatably connected to the outer surface of the top end of the nozzle, a fixed tube is fixedly connected to the top of the nozzle, a connecting hose is fixedly connected to the side of the fixed tube, and the end of the connecting hose away from the fixed tube is fixedly connected to the pressurized paint sprayer, and sliding plates are slidably connected to both ends of the side of the paint spray rack, an adjusting screw is connected to the internal thread of the sliding plate, a paddle is provided on the inner side of the sliding plate, and the paddle is in contact with the outer surface of the control switch.

[0011] Preferably, a first slide groove is opened on the upper surface of the equipment platform, the slider is slidably connected inside the first slide groove, a connecting rod is fixedly connected to the opposite side of the two groups of sliders, and the end of the connecting rope is fixedly connected to the outer surface of the connecting rod.

[0012] Preferably, a second slide groove is provided on the outer surface of the column, and both ends of the paint spray rack are fixedly connected to limit blocks, and the limit blocks are slidably connected to the inside of the second slide groove.

[0013] Preferably, a slide rail is fixedly connected inside the column, and second springs are movably sleeved on the outer surfaces of both ends of the slide rail. An arc-shaped tooth plate is slidably connected to the outer surface of the middle portion of the slide rail, and the arc-shaped tooth plate is movably engaged with the second gear.

[0014] Preferably, a transmission rod is movably hinged at the end of the sliding latch, and one end of the two groups of transmission rods away from the sliding latch is movably hinged to the side of the arc-shaped tooth plate.

[0015] Preferably, the number of nozzles is two groups and the number of nozzles in each group is multiple, and the control switches on the outer surfaces of the two groups of nozzles rotate in opposite directions.

[0016] Preferably, the thread grooves on the outer surfaces at both ends of the adjusting screw are in opposite directions, and an adjusting ring is fixedly sleeved on the outer surface of the middle portion of the adjusting screw.

[0017] Preferably, a fixed sleeve is fixedly connected to the inner side of the sliding plate, a third spring is provided inside the fixed sleeve, a movable rod is fixedly connected to the side of the paddle, and the movable rod is movably inserted into the interior of the fixed sleeve.

[0018] Preferably, a third sliding groove is opened on the side of the paint spraying rack, and the fixing sleeve is slidably connected inside the third sliding groove.

[0019] The present invention discloses a paint spraying device for a large steel structure, which has the following beneficial effects:

[0020] The paint spraying device for large steel structures pushes the sliding latch toward the inside of the column so that the two sets of transmission rods drive the two sets of arc-shaped toothed plates to slide along the slide rail to the opposite side. The second spring is compressed, and the two sets of arc-shaped toothed plates are removed from the outer surface of the second gear. The crank is rotated to drive the transmission shaft to rotate through the belt. The transmission shaft drives the rack to move upward through the first gear, thereby raising the height of the paint spraying stand. The sliding latch is released, and the two sets of arc-shaped toothed plates are re-movably engaged with the outer surface of the second gear under the action of the second spring, so that the height of the paint spraying stand can be adjusted conveniently. The paint spraying device is suitable for painting steel structures of different heights.

[0021] The paint spraying device for large steel structures rotates the adjusting screw through the adjusting ring, so that the two sets of sliding plates move toward the middle on the outer surfaces of both ends of the adjusting screw. At this time, the sliding plate drives the paddle to slide inside the third slide groove through the fixed sleeve, so that the paddle squeezes the side of the control switch, causing the control switch to rotate and close the nozzle. At this time, the next set of control switches are adjusted, and the control switches on the outer surfaces of the two sets of nozzles have opposite control directions. At this time, when the two sets of paddles move toward the middle, the nozzles at both ends will be closed one by one. When the paddles slide to both sides, the two sets of nozzles will be opened one by one, so that the paint spraying width of the lower surface of the paint spraying rack can be adjusted, which is suitable for painting steel structures of different widths.

[0022] The paint spraying device for large steel structures connects the first rotating roller to an external driving device so that the first rotating roller starts to rotate at a uniform speed. At this time, the first rotating roller pulls the paint carrier plate through the connecting rope to start sliding at a uniform speed along the first slide groove. At this time, the first spring is slowly compressed. At this time, the switch of the booster sprayer is turned on to spray paint. When the upper surface of the steel structure is completely painted, the driving device is controlled to rotate in the opposite direction. At this time, the first rotating roller releases the connecting rope, and at the same time, the first spring stretches to push the paint carrier plate to slide in the opposite direction for secondary painting, thereby facilitating the uniform speed movement of the steel structure during painting. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the main structure of the present invention;

[0024] Figure 2 An exploded view of the internal structure of the device platform of the present invention;

[0025] Figure 3 It is a schematic diagram of the outer surface structure of the column of the present invention;

[0026] Figure 4 For the present invention Figure 3 A magnified view of the structure of part A;

[0027] Figure 5 This is a schematic diagram of the lower surface structure of the paint spraying rack of the present invention;

[0028] Figure 6 This is an exploded view of the internal structure of the paint spraying stand of the present invention;

[0029] Figure 7 It is a schematic diagram of the structure of the outer surface of the adjusting screw rod of the present invention.

[0030] In the figure: 1. equipment platform; 2. paint carrier plate; 3. column; 4. booster paint sprayer; 5. fixed plate; 6. paint spray rack; 7. first slide groove; 8. first rotating roller; 9. guide rail; 10. slider; 11. first spring; 12. connecting rod; 13. connecting rope; 14. second rotating roller; 15. rack; 16. transmission shaft; 17. first gear; 18. sliding latch; 19. second slide groove; 20. crank; 21. second gear; 22. transmission rod; 23. arc tooth plate; 24. slide rail; 25. second spring; 26. paddle; 27. limit block; 28. nozzle; 29. ​​third slide groove; 30. adjusting screw; 31. adjusting ring; 32. connecting hose; 33. fixing pipe; 34. control switch; 35. sliding plate; 36. fixing sleeve; 37. third spring; 38. movable rod. DETAILED DESCRIPTION

[0031] The embodiment of the present invention discloses a paint spraying device for large steel structures, such as Figure 1-7 As shown, in order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in combination with the drawings in the present invention and by way of example.

[0032] Embodiment 1

[0033] like Figure 1-7 A large-scale steel structure painting device is shown, comprising an equipment platform 1, a paint carrier plate 2 is slidably connected to the upper surface of the equipment platform 1, columns 3 are fixedly connected to both sides of the equipment platform 1, a paint spray rack 6 is slidably connected to the opposite side of two groups of columns 3, a booster paint sprayer 4 is fixedly connected to the side of one group of columns 3, and the output end of the booster paint sprayer 4 is connected to the inside of the paint spray rack 6 through a hose;

[0034] The tops of the two groups of columns 3 are fixedly connected with a fixing plate 5, the upper surface of the spray paint rack 6 is fixedly connected with a rack 15, the top of the rack 15 is movably inserted into the inside of the fixing plate 5, the inside of the fixing plate 5 is rotatably connected with a first gear 17, and the side of the first gear 17 is fixedly connected with a transmission shaft 16;

[0035] A group of columns 3 are rotatably connected to the side of a crank 20, and one end of the transmission shaft 16 away from the first gear 17 is transmission-connected to the crank 20 through a belt, the end of the crank 20 extends to the inside of the column 3 and the end of the crank 20 is fixedly connected to the second gear 21, a sliding latch 18 is slidably inserted into the front of the column 3, and the sliding latch 18 is movably engaged with the second gear 21, and a second slide groove 19 is provided on the outer surface of the column 3, and both ends of the paint spraying rack 6 are fixedly connected to a limiting block 27, and the limiting block 27 is slidably connected to the inside of the second slide groove 19, and a slide rail 24 is fixedly connected to the inside of the column 3, and a second spring 25 is movably sleeved on the outer surface of both ends of the slide rail 24, and an arc-shaped toothed plate 23 is slidably connected to the outer surface of the middle part of the slide rail 24, and the arc-shaped toothed plate 23 is movably engaged with the second gear 21, and a transmission rod 22 is movably hinged at the end of the sliding latch 18, and one end of the two groups of transmission rods 22 away from the sliding latch 18 is movably hinged to the side of the arc-shaped toothed plate 23;

[0036] When the device is in use, the height of the steel structure to be painted is first measured, and then the sliding latch 18 is pushed toward the inside of the column 3, so that the sliding latch 18 drives the two sets of arc-shaped toothed plates 23 to slide along the slide rail 24 to the opposite side through the two sets of transmission rods 22, so that the second spring 25 is compressed. At this time, the two sets of arc-shaped toothed plates 23 are moved away from the outer surface of the second gear 21. At this time, the crank 20 is rotated to make the crank 20 drive the transmission shaft 16 to rotate through the belt. At this time, the transmission shaft 16 drives the first gear 17 to rotate. At this time, the first gear 17 is engaged with the rack 15 to drive the rack 15 to move upward inside the fixed plate 5, so as to raise the height of the paint rack 6, so that the distance between the paint rack 6 and the paint carrier plate 2 is greater than the height of the steel structure. At this time, the sliding latch 18 is released. At this time, under the action of the second spring 25, the two sets of arc-shaped toothed plates 23 are re-movably clamped on the outer surface of the second gear 21 for fixation, so that the height of the paint rack 6 can be adjusted conveniently, and it is suitable for painting steel structures of different heights.

[0037] Embodiment 2

[0038] like Figure 1-7The lower surface of the paint spraying frame 6 of the large steel structure paint spraying device shown in the figure is fixedly connected with a nozzle 28, the outer surface of the top of the nozzle 28 is rotatably connected with a control switch 34, the top of the nozzle 28 is fixedly connected with a fixed pipe 33, the side of the fixed pipe 33 is fixedly connected with a connecting hose 32, and the end of the connecting hose 32 away from the fixed pipe 33 is fixedly connected to the booster paint sprayer 4, and the two ends of the side of the paint spraying frame 6 are slidably connected with a sliding plate 35, the internal thread of the sliding plate 35 is connected with an adjusting screw 30, and the inner side of the sliding plate 35 is provided with a paddle 26, which contacts the outer surface of the control switch 34, and the nozzle 28 is fixedly connected with a fixed pipe 33. There are two groups of nozzles 28, and each group of nozzles 28 has a plurality of nozzles 28. The control switches 34 on the outer surfaces of the two groups of nozzles 28 rotate in opposite directions. The thread grooves on the outer surfaces of the two ends of the adjusting screw 30 are in opposite directions. An adjusting ring 31 is fixedly sleeved on the outer surface of the middle portion of the adjusting screw 30. A fixed sleeve 36 is fixedly connected to the inner side of the sliding plate 35. A third spring 37 is arranged inside the fixed sleeve 36. A movable rod 38 is fixedly connected to the side of the paddle 26. The movable rod 38 is movably inserted inside the fixed sleeve 36. A third slide groove 29 is opened on the side of the paint spraying frame 6. The fixed sleeve 36 is slidably connected inside the third slide groove 29.

[0039] After the operation of the first embodiment is completed, the width of the steel structure is measured, and then the paint spraying width of the paint spraying rack 6 is adjusted according to the width of the steel structure. At this time, the adjusting screw 30 is rotated by the adjusting ring 31, so that the two sets of sliding plates 35 move to the middle of the outer surfaces at both ends of the adjusting screw 30. At this time, the sliding plate 35 drives the paddle 26 to slide inside the third slide groove 29 through the fixed sleeve 36. When the paddle 26 contacts the outer surface of the control switch 34, the side of the control switch 34 is squeezed to rotate the control switch 34, so that the nozzle 28 is closed. At the same time, when the control switch 34 is closed, it cannot be rotated at this time. At this time, the paddle 26 continues to slide along the third slide groove 29. When the paddle 26 is disengaged from the control switch 34, the movable rod 38 is extended outwardly under the action of the third spring 37, and the next group of control switches 34 are adjusted by continuing to move. The control switches 34 on the outer surfaces of the two groups of nozzles 28 rotate in opposite directions. When the two groups of paddles 26 move toward the middle, the nozzles 28 at both ends are closed one by one. When the paddles 26 slide to both sides, the two groups of nozzles 28 are opened one by one, so that the paint spraying width of the lower surface of the paint spraying rack 6 is adjusted, which is suitable for painting steel structures of different widths.

[0040] Embodiment 3

[0041] like Figure 1-7A paint spraying device for a large steel structure is shown, wherein the first rotating roller 8 and the second rotating roller 14 are rotatably connected inside the two ends of the equipment platform 1, respectively, a slider 10 is fixedly connected to the lower surface of the paint carrier plate 2, a guide rail 9 is fixedly connected inside the equipment platform 1, and a first spring 11 is movably sleeved on the outer surface of the guide rail 9 and one end close to the second rotating roller 14, a connecting rope 13 is fixedly connected to the outer surface of the first rotating roller 8, and the end of the connecting rope 13 away from the first rotating roller 8 passes around the outer surface of the second rotating roller 14 and the end of the connecting rope 13 is fixedly connected to the slider 10, a first slide groove 7 is opened on the upper surface of the equipment platform 1, and the slider 10 is slidably connected to the inside of the first slide groove 7, and a connecting rod 12 is fixedly connected to the opposite side of the two groups of sliders 10, and the end of the connecting rope 13 is fixedly connected to the outer surface of the connecting rod 12;

[0042] After the debugging of the device is completed, the steel structure is moved to the middle of the upper surface of the paint carrier 2, and then the first rotating roller 8 is connected to the external driving device, so that the first rotating roller 8 starts to rotate at a uniform speed. At this time, the first rotating roller 8 reels the connecting rope 13. At this time, the other end of the connecting rope 13 pulls the paint carrier 2 along the first slide groove 7 through the connecting rod 12 to start sliding at a uniform speed. At this time, the first spring 11 is slowly compressed. At this time, the switch of the booster sprayer 4 is turned on, so that the anti-rust paint enters the interior of the fixed pipe 33 through the connecting hose 32, and then is sprayed downward through the nozzle 28 to paint the upper surface of the steel structure. When the upper surface of the steel structure is completely painted, it is controlled to rotate in the opposite direction by controlling the driving device. At this time, the first rotating roller 8 releases the connecting rope 13, and at the same time, the first spring 11 stretches to push the paint carrier 2 to slide in the opposite direction for secondary painting, so as to facilitate the uniform movement of the steel structure during painting.

[0043] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A painting device for a large steel structure, comprising an equipment platform (1), characterized in that: The upper surface of the equipment platform (1) is slidably connected to a paint carrier plate (2), both sides of the equipment platform (1) are fixedly connected to columns (3), the opposite sides of two groups of columns (3) are slidably connected to a paint spray rack (6), and the side of one group of columns (3) is fixedly connected to a booster paint sprayer (4), and the output end of the booster paint sprayer (4) is connected to the inside of the paint spray rack (6) through a hose; The tops of the two groups of columns (3) are fixedly connected with a fixing plate (5), the upper surface of the paint spraying rack (6) is fixedly connected with a rack (15), the top of the rack (15) is movably inserted into the inside of the fixing plate (5), the inside of the fixing plate (5) is rotatably connected with a first gear (17), the side of the first gear (17) is fixedly connected with a transmission shaft (16), the side of one group of columns (3) is rotatably connected with a crank (20), the end of the transmission shaft (16) away from the first gear (17) is transmission-connected with the crank (20) through a belt, the end of the crank (20) extends to the inside of the column (3) and the end of the crank (20) is fixedly connected with a second gear (21), the front of the column (3) is slidably inserted with a sliding latch (18), and the sliding latch (18) is movably engaged with the second gear (21); The two ends of the equipment platform (1) are internally rotatably connected to a first rotating roller (8) and a second rotating roller (14), the lower surface of the paint carrier (2) is fixedly connected to a slider (10), the interior of the equipment platform (1) is fixedly connected to a guide rail (9), the outer surface of the guide rail (9) and one end close to the second rotating roller (14) is movably sleeved with a first spring (11), the outer surface of the first rotating roller (8) is fixedly connected to a connecting rope (13), the end of the connecting rope (13) away from the first rotating roller (8) is passed around the outer surface of the second rotating roller (14), and the end of the connecting rope (13) is fixedly connected to the slider (10); The lower surface of the spray paint rack (6) is fixedly connected with a nozzle (28), the outer surface of the top end of the nozzle (28) is rotatably connected with a control switch (34), the top of the nozzle (28) is fixedly connected with a fixed tube (33), the side of the fixed tube (33) is fixedly connected with a connecting hose (32), the end of the connecting hose (32) away from the fixed tube (33) is fixedly connected to the booster paint sprayer (4), both ends of the side of the spray paint rack (6) are slidably connected with sliding plates (35), the internal thread of the sliding plate (35) is connected with an adjusting screw (30), the inner side of the sliding plate (35) is provided with a paddle (26), and the paddle (26) is in contact with the outer surface of the control switch (34); The interior of the column (3) is fixedly connected with a slide rail (24), and the outer surfaces of both ends of the slide rail (24) are movably sleeved with a second spring (25). The outer surface of the middle part of the slide rail (24) is slidably connected with an arc-shaped toothed plate (23), and the arc-shaped toothed plate (23) is movably engaged with the second gear (21). The end of the sliding latch (18) is movably hinged with a transmission rod (22), and one end of the two groups of transmission rods (22) away from the sliding latch (18) is movably hinged to the side of the arc-shaped toothed plate (23).

2. A large-scale steel structure spraying device according to claim 1, characterized in that: A first slide groove (7) is provided on the upper surface of the equipment platform (1), and the slider (10) is slidably connected inside the first slide groove (7). A connecting rod (12) is fixedly connected to the opposite side of the two groups of sliders (10), and the end of the connecting rope (13) is fixedly connected to the outer surface of the connecting rod (12).

3. A large-scale steel structure spraying device according to claim 1, characterized in that: A second slide groove (19) is provided on the outer surface of the column (3), and both ends of the paint spraying rack (6) are fixedly connected to limit blocks (27), and the limit blocks (27) are slidably connected to the inside of the second slide groove (19).

4. A large-scale steel structure spraying device according to claim 1, characterized in that: The number of the nozzles (28) is two groups, and the number of nozzles (28) in each group is multiple, and the control switches (34) on the outer surfaces of the two groups of nozzles (28) rotate in opposite directions.

5. A large-scale steel structure spraying device according to claim 1, characterized in that: The thread grooves on the outer surfaces of both ends of the adjusting screw (30) are in opposite directions, and an adjusting ring (31) is fixedly sleeved on the outer surface of the middle portion of the adjusting screw (30).

6. A large-scale steel structure spraying device according to claim 1, characterized in that: A fixed sleeve (36) is fixedly connected to the inner side of the sliding plate (35), a third spring (37) is provided inside the fixed sleeve (36), and a movable rod (38) is fixedly connected to the side of the paddle (26), and the movable rod (38) is movably inserted into the interior of the fixed sleeve (36).

7. A large-scale steel structure spraying device according to claim 6, characterized in that: A third sliding groove (29) is provided on the side of the paint spraying rack (6), and the fixing sleeve (36) is slidably connected inside the third sliding groove (29).