A steel pipe inner wall rust removal and paint spraying machine

Abstract

The utility model relates to a paint spraying machine technical field, concretely relates to a steel pipe inner wall rust removal paint spraying machine, including third shell, the inside installation of third shell has the second mounting plate, the side surface rotation of second mounting plate is connected with the hollow shaft, one end of hollow shaft reaches third shell outside, one end side surface mounting of hollow shaft has the guide sleeve. The utility model moves through electric push rod and leads to the movement of guide block, and then under the cooperation of rack and third gear can drive the rotation of connecting shaft, and under the action of connecting rod can make second shell open, make the caterpillar band and pipeline inner wall abut, simultaneously, through double shaft motor can drive the rotation of caterpillar band wheel, make the polishing disc can rotate along the pipeline inner wall, again through the drive motor can drive the rotation of hollow shaft under the action of first gear and second gear, and then can drive the polishing disc circumferential rotation through guide sleeve and slide rod, carry out the rust removal polishing of pipeline inner wall, and rust removal is convenient.

Description

Technical Field

[0001] This utility model relates to the field of spray painting machine technology, specifically a steel pipe inner wall rust removal and spray painting machine. Background Technology

[0002] With the rapid development of infrastructure such as ports, steel pipes, as an important structural material, are widely used in various projects. However, during long-term use, the inner wall of steel pipes is prone to rust due to moisture, corrosive media or seawater erosion, which not only affects the structural strength and service life, but may also cause safety hazards. Therefore, during use, it is necessary to treat the inside of the pipes regularly with a rust removal and painting machine.

[0003] Existing rust removal and painting machines generally require manual operation of the grinding head to grind and remove rust from the inner wall of the pipe. After rust removal, the inside of the pipe is then painted using a spray bar. This is cumbersome to use. Furthermore, due to the small space inside the pipe, and the fact that the operator needs to operate the grinding head and spray bar from the outside, dead corners are easily created on the inner wall of the pipe during the rust removal and painting process, resulting in poor performance.

[0004] Therefore, a steel pipe inner wall rust removal and painting machine is proposed to solve the problems mentioned above. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a steel pipe inner wall rust removal and painting machine, which can solve the problem of troublesome rust removal and painting.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a steel pipe inner wall rust removal and painting machine, including a third outer shell, a second mounting plate installed inside the third outer shell, a hollow shaft rotatably connected to the side of the second mounting plate, and one end of the hollow shaft extending to the outside of the third outer shell; A guide sleeve is installed on one side of the hollow shaft. A slide rod is provided inside the guide sleeve. One end of the slide rod extends to the outside of the guide sleeve, and a first strip-shaped connecting plate is installed on one end of the slide rod. A second strip-shaped connecting plate is connected to the top of the first strip-shaped connecting plate through a fixing mechanism. A U-shaped seat is installed on the top of the second strip-shaped connecting plate, and a grinding disc is rotatably connected inside the U-shaped seat. A first gear is mounted on one side of the hollow shaft, and a drive motor is mounted on the side of the second mounting plate. The output shaft of the drive motor is connected to a second gear, which meshes with the first gear. A liquid storage tank is installed inside the third outer shell. An infusion pump is installed on the other side of the second mounting plate. The inlet end of the infusion pump is connected to the inside of the liquid storage tank through an inlet pipe, and the outlet end of the infusion pump is connected to an outlet pipe. The other end of the outlet pipe is connected to a hollow shaft through a swivel joint. An infusion pipe is installed on the other end of the hollow shaft, and the other end of the infusion pipe is connected to a diversion pipe. Several nozzles are installed on one side of the top of the first strip-shaped connecting plate, and one end of each nozzle is connected to the side of the diversion pipe.

[0007] Preferably, one end of the third outer shell is bolted to the first outer shell, and several fourth outer shells are mounted on the side of the first outer shell. Each fourth outer shell has a pair of connecting shafts rotatably connected inside. Several guide rods are installed on the inner edge of the first housing. A pair of guide blocks are slidably connected to the side of each guide rod. The near ends of several pairs of guide blocks are connected to connecting blocks through brackets. An electric push rod is installed on one side of the connecting block. A first mounting plate is installed inside the first housing. The other end of the electric push rod is fixed to the side of the first mounting plate. The interior of the fourth housing is connected to the interior of the first housing, and a third gear is installed on the side of one of the connecting shafts in each pair of connecting shafts, and a rack is installed at one end of each pair of guide blocks, with each rack meshing with the corresponding third gear.

[0008] Preferably, both ends of each connecting shaft extend to the outside of the fourth housing, and both ends of each connecting shaft are connected to a connecting rod. The other end of each set of connecting rods is rotatably connected to a second housing. Several pairs of track wheels are symmetrically installed on both sides of the second housing. The track wheels are connected to each other by tracks, and the proximal ends of one pair of track wheels extend into the interior of the second housing. A dual-axis motor is installed inside the second housing, and the output shaft ends of the dual-axis motor are connected to the ends of the corresponding track wheels.

[0009] Preferably, the guide sleeve has strip grooves on both sides, and the slide rod has screws installed vertically on both sides. One end of each screw passes through the corresponding strip groove, and a fastening nut is threaded onto the end of each screw. When the fastening nut is tightened, one end of the fastening nut abuts against the side of the guide sleeve.

[0010] Preferably, a control motherboard is installed inside the first housing, and the control motherboard is connected to the electric push rod and the dual-axis motor respectively via wires; Furthermore, an umbilical cable is installed at one end of the first housing, and the control motherboard is connected to the power supply through the umbilical cable.

[0011] Preferably, the first housing has a slot at one end near the third housing, and a plug is installed at one end of the third housing near the first housing. When the third housing is fixed to the first housing, one end of the plug extends into the slot. The control motherboard is connected to the slot via wires, and the drive motor and the infusion pump are both connected to the plug via wires. The control motherboard is connected to the drive motor and the infusion pump via the slot and the plug, respectively.

[0012] Preferably, there is a gap between the end of the nozzle and the edge of the grinding disc.

[0013] Preferably, the fixing mechanism includes a limiting frame installed on the top of the first strip connecting plate, the bottom of the second strip connecting plate is located inside the limiting frame, and both ends of the top of the second strip connecting plate are fastened to the top of the first strip connecting plate by fastening bolts.

[0014] Compared with the prior art, this utility model provides a steel pipe inner wall rust removal and painting machine, which has the following beneficial effects: 1. The guide block is moved by the electric push rod, which in turn drives the connecting shaft to rotate under the cooperation of the rack and pinion and the third gear. Under the action of the connecting rod, the second outer shell can be opened, so that the track abuts against the inner wall of the pipe. At the same time, the track wheel can be rotated by the dual-axis motor, so that the grinding disc can rotate along the inner wall of the pipe. Then, the hollow shaft can be rotated by the action of the first gear and the second gear through the drive motor. In turn, the grinding disc can be rotated in a circle through the guide sleeve and the slide rod to remove rust and grind the inner wall of the pipe. Rust removal is convenient.

[0015] 2. The paint in the storage tank can be transported to the distribution pipe through the inlet pipe, outlet pipe, hollow shaft and infusion pipe by the infusion pump. Finally, it is sprayed onto the inner wall of the pipe through the nozzle to treat the inner wall of the pipe with paint. The treatment is thorough and improves the use effect. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the present utility model. Figure 1 ; Figure 2 This is a schematic diagram of the structure of the present utility model. Figure 2 ; Figure 3 This is a side sectional view of the first, third, and fourth outer shell structures of this utility model; Figure 4 This is a side sectional view of the internal structure of the second outer shell of this utility model; Figure 5 This is a schematic diagram of the connection structure between the first outer shell and the second outer shell of this utility model and the pipeline; Figure 6 This is a schematic diagram of the first strip-shaped connecting plate and the grinding disc structure of this utility model.

[0017] In the diagram: 1. Umbilical cable; 2. First outer shell; 3. Connecting rod; 4. Track wheel; 5. Second outer shell; 6. Diverter pipe; 7. Nozzle; 8. First strip connecting plate; 9. Grinding disc; 10. Slide rod; 11. Strip groove; 12. Fastening nut; 13. Screw; 14. Infusion tube; 15. Third outer shell; 16. Fourth outer shell; 17. Guide sleeve; 18. First gear; 19. Second gear; 20. Drive motor; 21. Infusion tube; 22. Infusion spout 23. Liquid pump; 24. Inlet pipe; 25. Connecting block; 26. Electric push rod; 27. Control main board; 28. First mounting plate; 29. ​​Guide block; 30. Rack; 31. Connecting shaft; 32. Third gear; 33. Liquid storage tank; 34. Second mounting plate; 35. Hollow shaft; 36. Dual-axis motor; 37. Guide rod; 38. Plug; 39. Slot; 40. Fastening bolt; 41. Limiting frame; 42. Second strip connecting plate; 43. U-shaped seat. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] Example: Please see Figure 1 - Figure 5 The steel pipe inner wall rust removal and painting machine in this embodiment includes a third outer shell 15. One end of the third outer shell 15 is connected to a first outer shell 2 by bolts. A control main board 26 is installed inside the first outer shell 2, and an umbilical cable 1 is installed at one end of the first outer shell 2. The control main board 26 is connected to the power supply through the umbilical cable 1. The control main board 26 is either a PCB circuit board or a microcontroller circuit board. The external power supply can be connected to the control main board 26 through the umbilical cable 1, so that the control main board 26 can work normally.

[0020] like Figure 3 As shown, the first housing 2 has a slot 38 at one end near the third housing 15, and a plug 37 is installed at one end of the third housing 15 near the first housing 2. When the third housing 15 is fixed to the first housing 2, one end of the plug 37 extends into the slot 38, and the control motherboard 26 is connected to the slot 38 through a wire.

[0021] like Figure 3As shown, a second mounting plate 33 is installed inside the third housing 15. A hollow shaft 34 is rotatably connected to the side of the second mounting plate 33. One end of the hollow shaft 34 extends to the outside of the third housing 15. A first gear 18 is installed on one side of the hollow shaft 34. A drive motor 20 is installed on the side of the second mounting plate 33. A second gear 19 is connected to the output shaft end of the drive motor 20. The second gear 19 meshes with the first gear 18. The drive motor 20 is connected to the plug 37 through a wire. The control board 26 is connected to the drive motor 20 through the cooperation of the plug 37 and the slot 38. In actual use, the drive motor 20 can drive the second gear 19 to rotate. The cooperation of the second gear 19 and the first gear 18 can drive the hollow shaft 34 to rotate.

[0022] like Figure 1 and Figure 2 As shown, a guide sleeve 17 is installed on one side of the hollow shaft 34. A slide rod 10 is provided inside the guide sleeve 17. One end of the slide rod 10 extends to the outside of the guide sleeve 17, and a first strip-shaped connecting plate 8 is installed on one end of the slide rod 10. A second strip-shaped connecting plate 41 is connected to the top of the first strip-shaped connecting plate 8 through a fixing mechanism. A U-shaped seat 42 is installed on the top of the second strip-shaped connecting plate 41. A grinding disc 9 is rotatably connected inside the U-shaped seat 42. In actual use, the position between the slide rod 10 and the guide sleeve 17 can be adjusted so that the edge of the grinding disc 9 can contact the inner wall of the pipe. Then, when the hollow shaft 34 rotates, it will drive the grinding disc 9 to rotate with the hollow shaft 34 to grind and remove rust from the inner wall of the pipe.

[0023] like Figure 6 As shown, the fixing mechanism includes a limiting frame 40 installed on the top of the first strip connecting plate 8, and the bottom of the second strip connecting plate 41 is located inside the limiting frame 40. Both ends of the top of the second strip connecting plate 41 are fastened to the top of the first strip connecting plate 8 by fastening bolts 39. The limiting frame 40 can limit the second strip connecting plate 41, and the fastening bolts 39 can fix the second strip connecting plate 41 and the first strip connecting plate 8 together. The fixing is convenient and easy to disassemble and replace.

[0024] like Figure 1 and Figure 2 As shown, both sides of the guide sleeve 17 are provided with strip grooves 11, and both sides of the slide rod 10 are vertically installed with screws 13. One end of each screw 13 passes through the corresponding strip groove 11, and the end of each screw 13 is threaded with a fastening nut 12. When the fastening nut 12 is tightened, one end of the fastening nut 12 abuts against the side of the guide sleeve 17. After adjusting the position between the slide rod 10 and the guide sleeve 17, the operator can tighten the fastening nut 12 to fix the slide rod 10 and the guide sleeve 17 together. This can fix the grinding disc 9 so that the grinding disc 9 will not detach from the inner wall of the pipe during use.

[0025] like Figure 2 and Figure 3 As shown, a liquid storage tank 32 is installed inside the third outer casing 15. An infusion pump 22 is installed on the other side of the second mounting plate 33. The inlet end of the infusion pump 22 is connected to the inside of the liquid storage tank 32 through an inlet pipe 23, and the outlet end of the infusion pump 22 is connected to an outlet pipe 21. The other end of the outlet pipe 21 is connected to a hollow shaft 34 through a swivel joint. An infusion pipe 14 is installed on the other end of the hollow shaft 34, and the other end of the infusion pipe 14 is connected to a diverter pipe 6. Several nozzles 7 are installed on one side of the top of the first strip-shaped connecting plate 8. One end of each nozzle 7... All are connected to the side of the diversion pipe 6. The infusion pump 22 is connected to the plug 37 through the wire, and the control motherboard 26 is connected to the infusion pump 22 through the slot 38 and the plug 37. In actual use, while the polishing disc 9 scrapes and polishes the rust on the inside of the pipe, the infusion pump 22 delivers the paint in the storage tank 32 through the inlet pipe 23 and the outlet pipe 21 to the hollow shaft 34. Then the paint is delivered to the infusion pipe 14 and flows into the diversion pipe 6 along the infusion pipe 14. Finally, it is sprayed onto the inner wall of the pipe through the nozzle 7 to complete the painting.

[0026] It should be noted that there is a gap between the end of the nozzle 7 and the edge of the grinding disc 9, so that the nozzle 7 will not collide with the inner wall of the pipe when the grinding disc 9 scrapes off the rust on the inner wall of the pipe.

[0027] like Figure 3 As shown, several guide rods 36 are installed on the inner edge of the first outer casing 2. Each guide rod 36 has a pair of guide blocks 28 slidably connected to its side. The near ends of the pairs of guide blocks 28 are connected to connecting blocks 24 through brackets. An electric push rod 25 is installed on one side of the connecting block 24. A first mounting plate 27 is installed inside the first outer casing 2. The other end of the electric push rod 25 is fixed on the side of the first mounting plate 27. The electric push rod 25 is connected to the control main board 26 through wires. In actual use, the connecting block 24 can be moved by the electric push rod 25. When the connecting block 24 moves, it can drive the guide blocks 28 to move along the guide rods 36.

[0028] like Figure 3 As shown, several fourth housings 16 are installed on the side of the first housing 2. Each fourth housing 16 is rotatably connected to a pair of connecting shafts 30. The interior of the fourth housing 16 is connected to the interior of the first housing 2. A third gear 31 is installed on the side of one of the connecting shafts 30 in each pair. A rack 29 is installed at one end of each pair of guide blocks 28. Each rack 29 meshes with the corresponding third gear 31. As the guide block 28 moves along the guide rod 36, it drives the rack 29 to move. When the rack 29 moves, it drives the third gear 31 to move, thereby controlling the movement of the connecting shaft 30.

[0029] like Figure 1 , Figure 3 as well as Figure 5 As shown, both ends of each connecting shaft 30 extend to the outside of the fourth housing 16. Both ends of each connecting shaft 30 are connected to a connecting rod 3. The other end of each set of connecting rods 3 is rotatably connected to the second housing 5. Several pairs of track wheels 4 are symmetrically installed on both sides of the second housing 5. The track wheels 4 are connected to each other by tracks. When the connecting shaft 30 rotates, it will drive the connecting rod 3 to rotate, thereby controlling the distance between the second housing 5 and the first housing 2, so that the track on the second housing 5 can abut against the inner wall of the pipe.

[0030] like Figure 2 and Figure 4 As shown, the proximal ends of one pair of track wheels 4 extend into the interior of the second housing 5. A dual-axis motor 35 is installed inside the second housing 5. The output shaft ends of the dual-axis motor 35 are connected to the corresponding ends of the track wheels 4. The dual-axis motor 35 is connected to the control main board 26 through wires. During use, the dual-axis motor 35 can drive the track wheels 4 to rotate, thereby controlling the rotation of the track, so that the first housing 2 and the third housing 15 can move along the inner wall of the pipe, thereby controlling the movement of the grinding disc 9 and the spray nozzle 7 within the inner wall of the pipe to perform rust removal and painting treatment on the inner wall of the pipe.

[0031] It should be noted that when the track moves on the inner wall of the pipe, the side of the grinding disc 9 will be subjected to the friction of the inner wall of the pipe, which will cause it to rotate, thus improving the grinding effect on the inner wall of the pipe.

[0032] The working principle of the above embodiments is as follows: When in use, the operator loosens the fastening nut 12, then pulls the slide bar 10. The slide bar 10 moves the first strip connecting plate 8, which in turn moves the grinding disc 9. The grinding disc 9 is then adjusted to the preset position, and the fastening nut 12 is tightened to complete the adjustment. Afterwards, the workers placed the first outer shell 2 and the third outer shell 15 into the pipe, and the edge of the grinding disc 9 contacted the inner wall of the pipe. At this time, the workers sent the control signal to the control main board 26. After receiving the signal, the control main board 26 controlled the electric push rod 25 to retract. The electric push rod 25 drove the connecting block 24 to move. The connecting block 24 would synchronously drive the guide block 28 to move along the guide rod 36. When the guide block 28 moved, it drove the rack 29 to move. The rack 29 drove the third gear 31 to rotate, which in turn controlled the connecting shaft 30 to rotate. When the connecting shaft 30 rotated, it drove the connecting rod 3 to rotate. The connecting rod 3 drove the second outer shell 5 to open relative to the first outer shell 2, so that the track contacted the inside of the pipe, thus fixing the first outer shell 2 and the third outer shell 15 to the inner wall of the pipe. Then, the control board 26 controls the dual-axis motor 35 to work. The dual-axis motor 35 drives the track wheel 4 to rotate, so that the track moves along the inner wall of the pipe, which in turn drives the grinding disc 9 to move along the inner wall of the pipe. At the same time, the control board 26 controls the drive motor 20 to work. The drive motor 20 drives the second gear 19 to rotate, and the second gear 19 drives the first gear 18 to rotate, which in turn controls the hollow shaft 34 to rotate. During the rotation of the hollow shaft 34, the guide sleeve 17 will rotate. The guide sleeve 17 will drive the grinding disc 9 to rotate through the slide rod 10, so that the grinding disc 9 rotates along the inner wall of the pipe to scrape off the rust on the inner wall of the pipe. At the same time, the main control board 26 controls the operation of the infusion pump 22. The infusion pump 22 delivers the paint in the storage tank 32 through the inlet pipe 23 and the outlet pipe 21 to the hollow shaft 34. The oil passes through the hollow shaft 34 and the infusion pipe 14 to the diversion pipe 6, and finally is sprayed onto the inner wall of the pipe through the nozzle 7 to complete the painting process.

[0033] The installation, connection, or setting methods disclosed in this embodiment are all common mechanical connection methods. As long as they can achieve their beneficial effects, they can be implemented. Therefore, this embodiment will not elaborate on their specific structural composition and working principle.

[0034] Although embodiments of the present 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 present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A steel pipe inner wall rust removal and painting machine, characterized in that: Includes a third housing (15), inside which a second mounting plate (33) is installed, and a hollow shaft (34) is rotatably connected to the side of the second mounting plate (33), one end of which extends to the outside of the third housing (15); A guide sleeve (17) is installed on one side of the hollow shaft (34). A slide rod (10) is provided inside the guide sleeve (17). One end of the slide rod (10) extends to the outside of the guide sleeve (17), and a first strip connecting plate (8) is installed on one end of the slide rod (10). A second strip connecting plate (41) is connected to the top of the first strip connecting plate (8) through a fixing mechanism. A U-shaped seat (42) is installed on the top of the second strip connecting plate (41). A grinding disc (9) is rotatably connected inside the U-shaped seat (42). A first gear (18) is installed on one side of the hollow shaft (34), and a drive motor (20) is installed on the side of the second mounting plate (33). The output shaft end of the drive motor (20) is connected to a second gear (19), and the second gear (19) meshes with the first gear (18). The third outer shell (15) is equipped with a liquid storage tank (32). An infusion pump (22) is installed on the other side of the second mounting plate (33). The inlet end of the infusion pump (22) is connected to the inside of the liquid storage tank (32) through an inlet pipe (23). The outlet end of the infusion pump (22) is connected to an outlet pipe (21). The other end of the outlet pipe (21) is connected to a hollow shaft (34) through a rotating joint. An infusion pipe (14) is installed on the other end of the hollow shaft (34). The other end of the infusion pipe (14) is connected to a diversion pipe (6). Several nozzles (7) are installed on one side of the top of the first strip connecting plate (8). One end of each nozzle (7) is connected to the side of the diversion pipe (6).

2. The steel pipe inner wall rust removal and painting machine according to claim 1, characterized in that: One end of the third outer shell (15) is bolted to the first outer shell (2). Several fourth outer shells (16) are installed on the side of the first outer shell (2). Each of the fourth outer shells (16) is rotatably connected to a pair of connecting shafts (30). Several guide rods (36) are installed on the inner edge of the first outer shell (2). A pair of guide blocks (28) are slidably connected to the side of each guide rod (36). The near ends of several pairs of guide blocks (28) are connected to connecting blocks (24) through brackets. An electric push rod (25) is installed on one side of the connecting block (24). A first mounting plate (27) is installed inside the first outer shell (2). The other end of the electric push rod (25) is fixed on the side of the first mounting plate (27). The interior of the fourth outer shell (16) is connected to the interior of the first outer shell (2), and a third gear (31) is installed on the side of one of the connecting shafts (30) in each pair of connecting shafts (30), and a rack (29) is installed at one end of each pair of guide blocks (28), and each rack (29) meshes with the corresponding third gear (31).

3. The steel pipe inner wall rust removal and painting machine according to claim 2, characterized in that: Both ends of each connecting shaft (30) extend to the outside of the fourth housing (16), and both ends of each connecting shaft (30) are connected to a connecting rod (3). The other end of each set of connecting rods (3) is rotatably connected to a second housing (5). Several pairs of track wheels (4) are symmetrically installed on both sides of the second housing (5). The track wheels (4) are connected to each other by tracks, and the near ends of one pair of track wheels (4) extend into the interior of the second housing (5). A dual-axis motor (35) is installed inside the second housing (5), and the output shaft ends of the dual-axis motor (35) are connected to the ends of the corresponding track wheels (4).

4. A steel pipe inner wall rust removal and painting machine according to claim 1, characterized in that: The guide sleeve (17) has a strip groove (11) on both sides. The slide rod (10) has a screw (13) installed vertically on both sides. One end of each screw (13) passes through the corresponding strip groove (11), and the end of each screw (13) is threaded with a fastening nut (12). When the fastening nut (12) is tightened, one end of the fastening nut (12) abuts against the side of the guide sleeve (17).

5. A steel pipe inner wall rust removal and painting machine according to claim 3, characterized in that: The first outer casing (2) is equipped with a control motherboard (26), which is connected to the electric push rod (25) and the dual-axis motor (35) respectively via wires; An umbilical cable (1) is installed at one end of the first housing (2), and the control motherboard (26) is connected to the power supply through the umbilical cable (1).

6. A steel pipe inner wall rust removal and painting machine according to claim 5, characterized in that: The first outer shell (2) has a slot (38) at one end near the third outer shell (15), and a plug (37) is installed at one end of the third outer shell (15) near the first outer shell (2). When the third outer shell (15) is fixed to the first outer shell (2), one end of the plug (37) extends into the slot (38). The control motherboard (26) is connected to the slot (38) via a wire. The drive motor (20) and the infusion pump (22) are both connected to the plug (37) via wires. The control motherboard (26) is connected to the drive motor (20) and the infusion pump (22) via the slot (38) and the plug (37) respectively.

7. A steel pipe inner wall rust removal and painting machine according to claim 1, characterized in that: There is a gap between the end of the nozzle (7) and the edge of the grinding disc (9).

8. A steel pipe inner wall rust removal and painting machine according to claim 1, characterized in that: The fixing mechanism includes a limiting frame (40) installed on the top of the first strip connecting plate (8), the bottom of the second strip connecting plate (41) is located inside the limiting frame (40), and both ends of the top of the second strip connecting plate (41) are fastened to the top of the first strip connecting plate (8) by fastening bolts (39).

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