A paint sprayer for repairing a steel pipe

Abstract

The application relates to the paint spraying technical field and discloses a steel pipe paint spraying restorer which comprises a mounting top plate and a paint removing mechanism, the paint removing mechanism is fixedly installed at the left portion of the bottom surface of the mounting top plate, and the paint removing mechanism is composed of a shell, a lifting rod, a fixing cylinder, a compression spring, a limiting plate and a scraping plate, wherein the lifting rod is inserted into the upper surface of the shell. The steel pipe paint spraying restorer can remove the paint on the outer surface of the steel pipe through the paint removing mechanism and two paint scraping pads before paint spraying, the two ends of the special-shaped pipe can respectively perform blowing work and paint spraying work, the paint removing effect is good, the adhesion of the paint spraying is improved, when different-diameter steel pipes are painted, the tension of the two belts can be automatically adjusted, the two paint scraping pads can be in close contact with the steel pipes with different diameters, the air inlet of the air supply pipe can be automatically adjusted, the larger the diameter of the steel pipe, the greater the air injection amount, the smaller the diameter of the steel pipe, the smaller the paint spraying amount, and resources can be reasonably utilized.

Description

Technical Field

[0001] This invention relates to the field of spray painting technology, specifically to a steel pipe spray painting repair device. Background Technology

[0002] Spray painting is a coating method that uses a spray gun or disc atomizer to disperse the paint into uniform and fine droplets using pressure or centrifugal force, and then applies it to the surface of the object being painted. Spray painting methods can be divided into air spraying, airless spraying, and electrostatic spraying. Spray painting steel pipes can improve their protective properties and extend their lifespan. Secondly, it provides aesthetic appeal, achieving a pleasing appearance, and can also achieve sound insulation, heat insulation, and fireproofing effects. After long-term use, the paint on the outer surface of steel pipes may peel off, requiring repainting repair. During spray painting, the paint is usually sprayed directly onto the steel pipe using a spray gun. However, this covers the old paint residue on the outer surface, increasing the thickness of the old paint and resulting in uneven paint thickness in the final application. It also reduces the adhesion of the new paint. Summary of the Invention

[0003] The purpose of this invention is to provide a steel pipe paint repair device that solves the problem that residual old paint on the outer surface of the steel pipe will be covered, which not only leads to uneven paint thickness but also reduces the adhesion of new paint.

[0004] To solve the above technical problems, the present invention provides the following technical solution: a steel pipe paint repair device, comprising a mounting top plate and a paint removal mechanism. The paint removal mechanism is fixedly installed on the left side of the bottom surface of the mounting top plate. The paint removal mechanism consists of a shell, a lifting rod, a fixed cylinder, a compression spring, a limiting plate, and a scraping plate. The lifting rod is inserted into the upper surface of the shell, and the bottom end of the lifting rod is fixedly connected to the limiting plate. The limiting plate is fixedly connected to the scraping plate, and both the limiting plate and the scraping plate are slidably connected to the inner wall of the shell. The upper end of the fixed cylinder is fixedly connected to the inner top wall of the shell. The two ends of the compression spring are fixedly connected to the fixed cylinder and the limiting plate, respectively. The bottom surfaces of both the limiting plate and the scraping plate are arc-shaped, and both the bottom surfaces of the limiting plate and the scraping plate are provided with multiple protruding teeth.

[0005] Two symmetrical rotating columns are rotatably connected to the left side of the outer casing via bearings. Both rotating columns penetrate the outer casing and extend to the right side. Belts are fixedly connected to the right ends of both rotating columns. The two belts are symmetrically arranged and are made of rigid material, so they are less affected by lateral forces. The upper ends of the two belts are vertically wound around the outer surfaces of the two rotating columns. A bracket is fixedly connected to the bottom surface of the mounting plate. The bottom ends of both belts are fixedly connected to the bracket. Paint scraper pads are fixedly connected to the sides of the two belts that are close to each other. The four edges of the sides of the paint scraper pads that are close to each other are rounded. Gears are fixedly connected to the outer surfaces of the two rotating columns. A rack is placed between the two gears. Multiple teeth are provided on the front and rear sides of the rack. Both gears mesh with the rack.

[0006] A connecting cylinder is placed on the right side of the rack. The bottom end of the connecting cylinder is hemispherical. A lifting column is slidably connected inside the connecting cylinder. The bottom dimension of the lifting column is larger than its top dimension, and the top of the lifting column is T-shaped. A pressure regulating plug is fixedly connected to the bottom surface of the lifting column. The bottom end of the pressure regulating plug is spherical, and its top end is rod-shaped. The bottom end of the pressure regulating plug is slidably connected to the inner wall of the connecting cylinder. A special-shaped tube is placed on the right side of the outer shell. The connecting cylinder passes through the special-shaped tube, and the special-shaped tube is fixedly connected to the connecting cylinder. The two openings of the special-shaped tube are on the same plane. The outlet at the left end of the special-shaped tube is conical. A nozzle is installed at the other end of the special-shaped tube. An air supply pipe and a material supply pipe are fixedly connected to the outer surface of the special-shaped tube. A one-way valve is installed on the inner wall of the front part of the special-shaped tube, and two one-way valves are installed on the inner wall of the rear part of the special-shaped tube.

[0007] The bottom surface of the mounting plate has a T-shaped groove, and a T-shaped slider is slidably connected inside the T-shaped groove. An adjustment frame is fixedly connected to the bottom surface of the T-shaped slider. The upper end of the lifting rod is hinged to a balance column via a hinge. The middle end of the balance column has a groove. The bottom end of the adjustment frame is rotatably connected to a support rod via a bearing. The support rod is slidably connected to the groove. The right end of the balance column is hinged to the upper end of the lifting column via a hinge. A bolt is threaded onto the right side of the T-shaped slider. The left end of the bolt passes through the T-shaped slider and the mounting plate. Both ends of the bolt are rotatably connected to the mounting plate via bearings. A connecting plate is hinged to the upper end of the rack, and the upper end of the connecting plate is hinged to the balance column.

[0008] Furthermore, both the limiting plate and the scraping plate have arc-shaped cross-sections, and the width of the limiting plate is greater than the width of the scraping plate.

[0009] By adopting the above technical solution, the contact area between the limiting plate and the scraping plate is increased, which can reduce the wear caused by the torsion of the scraping plate. When the limiting plate contacts the inner bottom wall of the shell, it can also play a limiting role.

[0010] Furthermore, the upper surface of the limiting plate is hinged with two symmetrical insert rods, both of which are inclined, and the upper ends of both insert rods are fitted with sleeves. Both sleeves are hinged to the fixed cylinder, and both insert rods are in a charged state.

[0011] By adopting the above technical solution, the two insert rods can provide downward thrust to the limiting plate, and the two sleeves, the two insert rods and the limiting plate form a triangle, which further reduces the torque on the limiting plate.

[0012] Furthermore, the rack is hollow inside, and a fixing plate with an L-shaped cross-section is fixedly connected to the right side of the outer shell. The fixing plate is inserted into the inside of the rack.

[0013] By adopting the above technical solution, it is beneficial to stabilize the raising and lowering of the rack and avoid rack deviation.

[0014] Furthermore, a fixing frame is fixedly connected to the right side of the bottom surface of the mounting top plate. The right end of the fixing frame is cylindrical, and the left end of the fixing frame is fixedly connected to the outer shell. The connecting cylinder and the air supply pipe both pass through the fixing frame and are fixedly embedded in the fixing frame.

[0015] By adopting the above technical solution, the fixing frame can provide support for the connecting cylinder and the air supply pipe, thereby improving the stability of the connecting cylinder and the air supply pipe.

[0016] Furthermore, an air compressor and a paint can are fixedly embedded on the upper surface of the mounting plate. The bottom end of the paint can is conical and is fixedly connected to the upper end of the supply pipe.

[0017] By adopting the above technical solution, the air compressor can deliver high-pressure gas to the air supply pipe to achieve the effect of supplying air to the shaped pipe. The pressure inside the paint can is high at the top and low at the bottom, which can deliver the paint to the shaped pipe.

[0018] Furthermore, a fixed plate is fixedly connected to the inner wall of the connecting cylinder, a pressure regulating plug passes through the fixed plate and is inserted into the fixed plate, and a sealing ring is provided at the junction of the pressure regulating plug and the fixed plate.

[0019] By adopting the above technical solution, the sealing performance is improved, and excessive air pressure above the fixed plate is prevented from affecting the lifting column.

[0020] Compared with existing technologies, this steel pipe paint repair device has the following advantages:

[0021] 1. This invention can remove the paint from the outer surface of the steel pipe before painting by using a paint removal mechanism. The two paint scraper pads can further remove the paint and also make the old paint fall off the steel pipe. The two ends of the irregularly shaped pipe can be blown and painted respectively, resulting in a good paint removal effect and improved paint adhesion. When painting steel pipes of different diameters, the tension of the two belts can be automatically adjusted to ensure that the two paint scraper pads can make close contact with steel pipes of different diameters. It can also automatically adjust the air intake of the air supply pipe. The larger the diameter of the steel pipe, the greater the air volume, and the smaller the diameter of the steel pipe, the less paint is sprayed, which can make rational use of resources.

[0022] 2. The scraper of this invention is telescopic. The larger the diameter of the steel pipe, the greater the upward distance of the scraper, the greater the tilt of the balance column, and the greater the downward distance of the pressure regulating plug. This increases the air intake of the air supply pipe and improves the air pressure inside the shaped tube. Conversely, the smaller the diameter of the steel pipe, the lower the air pressure inside the shaped tube, and the less paint is needed, thus saving resources. By setting the bottom of the pressure regulating plug to be spherical, the gas ejected from the air supply pipe can be transported to both the front and rear sides along the spherical surface of the pressure regulating plug, reducing the resistance to gas flow.

[0023] 3. The support rod of this invention can serve as the fulcrum of the balance column. The fulcrum of the balance column can be adjusted by adjusting the left and right positions of the support rod. When the fulcrum moves to the left, the balance column becomes heavier on the left and lighter on the right, with the tilt amplitude on the right being greater than that on the left. When the fulcrum moves to the right, the balance column becomes heavier on the right and lighter on the left, with the tilt amplitude on the left being greater than that on the right. It can not only automatically adjust the tension of the belt, but also automatically adjust the feed amount of the pressure regulating plug, and adjust the fulcrum according to the bearing capacity of the steel pipe. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 This is a cross-sectional view of the front view of the paint removal mechanism of the present invention;

[0026] Figure 3 This is a cross-sectional view of the left side of the paint removal mechanism of the present invention;

[0027] Figure 4 This is a cross-sectional view of the right side view of the belt of the present invention;

[0028] Figure 5 This is a cross-sectional view of the top view of the irregular-shaped tube of the present invention;

[0029] Figure 6 This is a schematic diagram of the irregular tube structure of the present invention;

[0030] Figure 7 This is a schematic diagram of the fixing frame structure of the present invention;

[0031] Figure 8 This is a schematic diagram of the paint scraper pad structure of the present invention.

[0032] In the diagram: 1. Mounting top plate; 2. Paint removal mechanism; 202. Outer shell; 203. Lifting rod; 204. Fixing cylinder; 205. Compression spring; 206. Limiting plate; 207. Scraping plate; 3. Rotating column; 4. Belt; 5. Bracket; 6. Gear; 7. Rack; 8. Lifting column; 9. Irregular tube; 10. Air supply pipe; 11. Material supply pipe; 12. T-shaped slider; 13. Adjusting frame; 14. Balance column; 15. Slide groove; 16. Support rod; 17. Insert rod; 18. Sleeve; 19. Fixing plate; 20. Fixing frame; 21. Pressure regulating plug; 22. Connecting cylinder; 23. Paint scraper pad; 24. Fixing plate; 25. Connecting plate. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] Please see Figure 1-8 This invention provides a technical solution: a steel pipe paint repair device, comprising a mounting top plate 1 and a paint removal mechanism 2. The paint removal mechanism 2 is fixedly installed on the left side of the bottom surface of the mounting top plate 1. The paint removal mechanism 2 consists of a housing 202, a lifting rod 203, a fixing cylinder 204, a compression spring 205, a limiting plate 206, and a scraping plate 207. The lifting rod 203 is inserted into the upper surface of the housing 202, and the bottom end of the lifting rod 203 is fixedly connected to the limiting plate 206. The limiting plate 206 is fixedly connected to the scraping plate 207. Both the limiting plate 206 and the scraping plate 207 are slidably connected to the inner wall of the outer shell 202. The upper end of the fixing cylinder 204 is fixedly connected to the inner top wall of the outer shell 202. The two ends of the compression spring 205 are fixedly connected to the fixing cylinder 204 and the limiting plate 206 respectively. The compression spring 205 is in a compressed state. The bottom surfaces of both the limiting plate 206 and the scraping plate 207 are arc-shaped. The bottom surface of both plates is provided with multiple protruding teeth, which can effectively scrape off the old paint on the surface of the steel pipe. The cross-section of both the limiting plate 206 and the scraping plate 207 is arc-shaped, and the width of the limiting plate 206 is greater than the width of the scraping plate 207, which increases the contact area between the limiting plate 206 and the scraping plate 207 and reduces the wear caused by the torsional force on the scraping plate 207. When the limiting plate 206 contacts the inner bottom wall of the outer shell 202, it can also play a limiting role. The upper surface of 06 is hinged with two symmetrical insert rods 17, both of which are inclined. The upper ends of the two insert rods 17 are fitted with sleeves 18, and both sleeves 18 are hinged to the fixed cylinder 204. Both insert rods 17 are in a stored state. The two insert rods 17 can provide downward thrust to the limiting plate 206. The two sleeves 18, the two insert rods 17 and the limiting plate 206 form a triangle, which further reduces the torsional force on the limiting plate 206.

[0035] Two symmetrical rotating columns 3 are rotatably connected to the left side of the outer casing 202 via bearings. Both rotating columns 3 penetrate the outer casing 202 and extend to its right side. A belt 4 is fixedly connected to the right end of each rotating column 3. The two belts 4 are symmetrically arranged, with their upper ends vertically wound around the outer surface of the two rotating columns 3. A bracket 5 is fixedly connected to the bottom surface of the mounting plate 1, and the bottom ends of both belts 4 are fixedly connected to the bracket 5. A paint scraper pad 23 is fixedly connected to the side of each belt 4 that is close to each other. The outer surface of the paint scraper pad 23 is made of corundum material, which can effectively… The removal of waste from the outside of the steel pipe is a common structure in the prior art. The four edges of the two paint scraper pads 23 on their adjacent sides are rounded. Gears 6 are fixedly connected to the outer surfaces of the two rotating columns 3. A rack 7 is placed between the two gears 6. Multiple teeth are provided on the front and rear sides of the rack 7. Both gears 6 are meshed with the rack 7. The inside of the rack 7 is hollow. A fixing plate 19 with an L-shaped cross section is fixedly connected to the right side of the outer shell 202. The fixing plate 19 is inserted into the inside of the rack 7, which is conducive to the stable lifting and lowering of the rack 7 and prevents the rack 7 from deviating.

[0036] A connecting cylinder 22 is placed on the right side of the rack 7. The bottom end of the connecting cylinder 22 is hemispherical. A fixed plate 24 is fixedly connected to the inner wall of the connecting cylinder 22. A pressure regulating plug 21 passes through the fixed plate 24 and is inserted into the fixed plate 24. A sealing ring is provided at the junction of the pressure regulating plug 21 and the fixed plate 24 to improve the sealing performance and prevent excessive air pressure above the fixed plate 24 from affecting the lifting column. A lifting column 8 is slidably connected inside the connecting cylinder 22. The bottom dimension of the lifting column 8 is larger than its top dimension. The uppermost end of the lifting column 8 is T-shaped, and a pressure regulating plug 21 is fixedly connected to the bottom surface of the lifting column 8. The bottom end of the pressure regulating plug 21 is spherical, and its upper end is rod-shaped. The bottom end of the pressure regulating plug 21 is slidably connected to the inner wall of the connecting cylinder 22. A special-shaped tube 9 is placed on the right side of the outer shell 202. The connecting cylinder 22 passes through the special-shaped tube 9, and the special-shaped tube 9 is fixedly connected to the connecting cylinder 22. The two openings of the special-shaped tube 9 are on the same plane. The outlet at the left end of the special-shaped tube 9 is conical, and the other end of the special-shaped tube 9... The nozzle is installed, and the outer surface of the shaped tube 9 is fixedly connected to the air supply pipe 10 and the material supply pipe 11. A one-way valve is installed on the inner wall of the front part of the shaped tube 9, and two one-way valves are installed on the inner wall of the rear part of the shaped tube 9. A fixing frame 20 is fixedly connected to the right side of the bottom surface of the mounting top plate 1. The right end of the fixing frame 20 is cylindrical, and the left end of the fixing frame 20 is fixedly connected to the outer shell 202. The connecting cylinder 22 and the air supply pipe 10 both pass through the fixing frame 20 and are fixedly embedded in the fixing frame 20. The fixing frame 20 can provide support for the connecting cylinder 22 and the air supply pipe 10, thereby improving the stability of the connecting cylinder 22 and the air supply pipe 10. An air compressor and a paint can are fixedly embedded on the upper surface of the mounting top plate 1. The bottom end of the paint can is conical and is fixedly connected to the upper end of the material supply pipe 11. The air compressor can deliver high-pressure gas to the air supply pipe 10 to achieve the effect of supplying air to the shaped tube 9. The pressure inside the paint can is high at the top and low at the bottom, which can deliver the paint to the shaped tube 9.

[0037] The bottom surface of the mounting plate 1 has a T-shaped groove, and a T-shaped slider 12 is slidably connected inside the T-shaped groove. An adjusting frame 13 is fixedly connected to the bottom surface of the T-shaped slider 12. A balance column 14 is hinged to the upper end of the lifting rod 203 via a hinge. A groove 15 is provided in the middle of the balance column 14. A support rod 16 is rotatably connected to the bottom end of the adjusting frame 13 via a bearing. The support rod 16 is slidably connected to the groove 15. The right end of the balance column 14 is hinged to the upper end of the lifting column 8 via a hinge. The right side of the T-shaped slider 12 is threaded with a bolt. The left end of the bolt passes through the T-shaped slider 12 and the mounting top plate 1. Both ends of the bolt are rotatably connected to the mounting top plate 1 via bearings. The support rod 16 can serve as the fulcrum of the balance column 14. Rotating the threaded rod can adjust the position of the support rod 16, thereby changing the fulcrum of the balance column 14 and thus changing the force environment at both ends of the balance column 14. The upper end of the rack 7 is hinged with a connecting plate 25, and the upper end of the connecting plate 25 is hinged to the balance column 14.

[0038] In use, firstly, the mounting plate 1 needs to be installed onto the external industrial steel pipe painting device. Place the steel pipe to be painted under the scraper 207. Driven by an external power source, rotate and feed the steel pipe to the right. Under the elastic deformation of the compression spring 205 and the push of the two insert rods 17, the scraper 207 can make close contact with the steel pipe, scraping away the old paint on the outer surface of the steel pipe. The steel pipe supports the two scraper pads, bringing them into contact. As the steel pipe rotates and feeds to the right, the scraper pads further scrape away the old paint. Paint from inside the paint tank flows to the feed pipe 11 and enters the shaped pipe 9. At this point, the paint is located between the two one-way valves at the rear. Start the air compressor to pressurize the high-pressure gas... The gas is delivered to the gas supply pipe 10, and then the gas flows along the bottom of the pressure regulating plug 21 to the two ends of the shaped pipe 9. The one-way valve at the front opens, and the gas is sprayed out from the left end of the shaped pipe 9. The left end of the shaped pipe 9 is conical, and the internal air pressure is high at the top and low at the bottom. The sprayed gas pressure is relatively high, which can completely blow away the paint residue on the outer surface of the steel pipe. Then the two one-way valves at the rear open, and the paint sprayed from the left end of the shaped pipe 9 is sprayed out through the nozzle to paint the steel pipe. During the painting, the steel pipe needs to be rotated and fed to the right to ensure that the steel pipe can be completely de-painted and painted, avoid foreign matter remaining on the outer surface of the steel pipe, enhance the adhesion of the paint, and improve the repair effect on the steel pipe.

[0039] Next, when the diameter of the steel pipe to be repaired is large, the steel pipe will rise against the scraper plate 207. The scraper plate 207 drives the limit plate 206 to rise, the limit plate 206 drives the lifting rod 203 to rise, and the lifting rod 203 drives the balance column 14 to tilt. At this time, the left end of the balance column 14 rises and the right end falls, achieving the effect of left high and right low. The left end of the balance column 14 drives the rack 7 to rise through the connecting plate 25. The gear 6 drives the two gears 6 to rotate slightly in opposite directions. The two gears 6 drive the two rotating columns 3 to rotate slightly. The two rotating columns 3 loosen the two belts 4, achieving the effect of the two belts 4 automatically adjusting according to the size of the steel pipe, so that the two belts 4 can contact the outer surface of the larger steel pipe to adapt to the size of the steel pipe. The contact position between the steel pipe and the two scraper pads will also change. To prevent the steel pipe from being in constant contact with the two paint scraper pads, thus protecting the two paint scraper pads, the right end of the balance column 14 drives the lifting column 8 to descend, and the lifting column 8 drives the pressure regulating plug 21 to descend. The pressure regulating plug 21 reduces the blockage range of the air supply pipe 10 and the shaped pipe 9, and the amount of gas flowing out from the air supply pipe 10 increases, which increases the air pressure at both ends of the shaped pipe 9. Not only does the air jet force at the left end of the shaped pipe 9 increase, but the amount of paint sprayed by the nozzle at the right end of the pipe also increases. This can improve both the amount of paint sprayed on large-sized steel pipes and the efficiency of paint spraying on large-sized steel pipes. Similarly, when the diameter of the steel pipe to be repaired is small, the compression spring 205 will press the scraper plate 207 to descend. At this time, the balance column 14 has the effect of being lower on the left and higher on the right, which reduces the amount of paint sprayed and achieves the purpose of making reasonable use of resources.

[0040] Secondly, when it is necessary to adjust the fulcrum of the balance column 14, the bolt needs to be rotated to move the T-shaped slider 12 left and right. The T-shaped slider 12 moves the adjusting frame 13 left and right, and the adjusting frame 13 moves the support rod 16 left and right. This allows the fulcrum of the balance column 14 to be adjusted by adjusting the left and right positions of the support rod 16. When the fulcrum moves to the left, the balance column 14 becomes heavier on the left and lighter on the right, with the tilt amplitude greater on the right than on the left. The feed amount of the scraper 207 and the tension of the belt 4 are both greater than the feed amount of the pressure regulating plug 21. When the fulcrum moves to the right, the feed amount of the scraper 207 and the tension of the belt 4 are both less than the feed amount of the pressure regulating plug 21. This not only allows for automatic adjustment of the tension of the belt 4 and the feed amount of the pressure regulating plug 21 according to the different materials of the steel pipe, but also allows for adjustment of the fulcrum according to the required airflow of the steel pipe.

[0041] It should be noted that in this paper, relational terms such as first and second are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations.

[0042] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A steel pipe paint repair device, comprising a mounting top plate (1) and a paint removal mechanism (2), characterized in that: The paint removal mechanism (2) is fixedly installed on the left side of the bottom surface of the mounting top plate (1). The paint removal mechanism (2) consists of a shell (202), a lifting rod (203), a fixed cylinder (204), a compression spring (205), a limiting plate (206), and a scraping plate (207). The lifting rod (203) is inserted into the upper surface of the shell (202), and the bottom end of the lifting rod (203) is fixedly connected to the limiting plate (206). The limiting plate (206) and the scraping plate (207) are connected to each other. The fixed connection is such that the limiting plate (206) and the scraping plate (207) are slidably connected to the inner wall of the outer shell (202), the upper end of the fixed cylinder (204) is fixedly connected to the inner top wall of the outer shell (202), the two ends of the compression spring (205) are fixedly connected to the fixed cylinder (204) and the limiting plate (206) respectively, the bottom surfaces of the limiting plate (206) and the scraping plate (207) are both arc-shaped, and the bottom surfaces of the limiting plate (206) and the scraping plate (207) are provided with multiple protruding teeth; Two symmetrical rotating columns (3) are rotatably connected to the left side of the outer shell (202) via bearings. Both rotating columns (3) penetrate the outer shell (202) and extend to the right side of the outer shell (202). Both rotating columns (3) are fixedly connected to the right end of the two rotating columns (3). The two belts (4) are symmetrically arranged. The upper ends of the two belts (4) are respectively vertically wound around the outer surface of the two rotating columns (3). The bottom surface of the mounting plate (1) is fixedly connected to the bracket (5). The bottom ends of the two belts (4) are fixedly connected to the bracket (5). Both sides of the two belts (4) that are close to each other are fixedly connected to the paint scraper pad (23). The four edges of the sides of the two paint scraper pads (23) that are close to each other are rounded. Both rotating columns (3) are fixedly connected to the outer surface of the two rotating columns (3). A rack (7) is placed between the two gears (6). Multiple teeth are provided on the front and rear sides of the rack (7). Both gears (6) are meshed with the rack (7). A connecting cylinder (22) is placed on the right side of the rack (7). The bottom end of the connecting cylinder (22) is hemispherical. A lifting column (8) is slidably connected inside the connecting cylinder (22). The bottom dimension of the lifting column (8) is larger than its upper dimension, and the uppermost end of the lifting column (8) is T-shaped. A pressure regulating plug (21) is fixedly connected to the bottom surface of the lifting column (8). The bottom end of the pressure regulating plug (21) is spherical, and its upper end is rod-shaped. The bottom end of the pressure regulating plug (21) is slidably connected to the inner wall of the connecting cylinder (22). The outer shell (202) A shaped tube (9) is placed on the right side. A connecting tube (22) passes through the shaped tube (9) and the shaped tube (9) is fixedly connected to the connecting tube (22). The two openings of the shaped tube (9) are on the same plane. The outlet of the left end of the shaped tube (9) is conical. A nozzle is installed at the other end of the shaped tube (9). An air supply pipe (10) and a material supply pipe (11) are fixedly connected to the outer surface of the shaped tube (9). A one-way valve is installed on the inner wall of the front part of the shaped tube (9). Two one-way valves are installed on the inner wall of the rear part of the shaped tube (9). The bottom surface of the mounting plate (1) is provided with a T-shaped groove, and a T-shaped slider (12) is slidably connected inside the T-shaped groove. An adjustment frame (13) is fixedly connected to the bottom surface of the T-shaped slider (12). The upper end of the lifting rod (203) is hinged to a balance column (14) through a hinge. A groove (15) is provided in the middle of the balance column (14). The bottom end of the adjustment frame (13) is rotatably connected to a support rod (16) through a bearing. The support rod (16) is slidably connected to the groove (15). The right end of the balance column (14) is hinged to the upper end of the lifting column (8) through a hinge. A bolt is threaded on the right side of the T-shaped slider (12). The left end of the bolt passes through the T-shaped slider (12) and the mounting plate (1). Both ends of the bolt are rotatably connected to the mounting plate (1) through a bearing. A connecting plate (25) is hinged to the upper end of the rack (7), and the upper end of the connecting plate (25) is hinged to the balance column (14).

2. The steel pipe paint repair device according to claim 1, characterized in that: The cross-sections of the limiting plate (206) and the scraping plate (207) are both arc-shaped, and the width of the limiting plate (206) is greater than the width of the scraping plate (207).

3. The steel pipe paint repair device according to claim 1, characterized in that: The upper surface of the limiting plate (206) is hinged with two symmetrical insert rods (17). Both insert rods (17) are inclined. The upper ends of both insert rods (17) are sleeved with sleeves (18). Both sleeves (18) are hinged to the fixed cylinder (204). Both insert rods (17) are in a power storage state.

4. The steel pipe paint repair device according to claim 1, characterized in that: The rack (7) is hollow inside, and a fixing plate (19) with an L-shaped cross section is fixedly connected to the right side of the outer shell (202). The fixing plate (19) is inserted into the inside of the rack (7).

5. A steel pipe paint repair device according to claim 1, characterized in that: A fixing frame (20) is fixedly connected to the right side of the bottom surface of the mounting top plate (1). The right end of the fixing frame (20) is cylindrical. The left end of the fixing frame (20) is fixedly connected to the outer shell (202). The connecting cylinder (22) and the air supply pipe (10) both pass through the fixing frame (20) and are fixedly embedded in the fixing frame (20).

6. A steel pipe paint repair device according to claim 1, characterized in that: An air compressor and a paint can are fixedly embedded on the upper surface of the mounting plate (1). The bottom of the paint can is conical and is fixedly connected to the upper end of the feed pipe (11).

7. A steel pipe paint repair device according to claim 1, characterized in that: The inner wall of the connecting cylinder (22) is fixedly connected to a fixed plate (24), and the pressure regulating plug (21) passes through the fixed plate (24) and is inserted into the fixed plate (24). A sealing ring is provided at the junction of the pressure regulating plug (21) and the fixed plate (24).

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