A method and device for automatic polishing and spraying of pipes

Abstract

The application discloses a kind of pipeline automatic polishing and spraying method and device, it is related to pipeline rust-proof treatment technical field, its technical key points include rack, positioning component, supporting component, polishing component, spraying component and limiting component, the rack includes first machine base, second machine base, first support column, second support column, top frame, moving frame and walking component, the positioning component includes rotating center and telescopic center, the supporting component includes mounting bracket, hanger, bracket, pulley and first cylinder, the polishing component includes second cylinder and polisher, the spraying component includes barrel, diaphragm pump, distribution valve and spray gun.The technical effect is to integrate two processes of polishing and spraying into integrated equipment, without separate polishing area, spraying area, significantly reduce workshop site occupancy, improve site utilization, reduce labor intensity, improve work efficiency.

Description

Technical Field

[0001] This invention relates to the field of pipeline rust prevention technology, specifically to an automatic pipeline grinding and spraying method and apparatus. Background Technology

[0002] In industries such as pipe processing, steel structure construction, and hardware manufacturing, surface grinding and rust removal followed by protective spraying of round pipes are essential processing steps. Currently, the industry commonly uses a manual, segmented approach for surface treatment of medium and small-sized round pipes (diameters of 26mm, 32mm, 40mm, and 50mm) up to 6 meters in length: First, a person manually uses a handheld angle grinder to remove rust and grind the surface of the round pipe. During the grinding process, the round pipe needs to be repeatedly rotated to complete the treatment of the entire circumference. Then, a person manually uses a handheld spray gun for spraying. During spraying, the pipe also needs to be rotated multiple times to avoid problems such as spraying dead corners, missed areas, or uneven paint thickness.

[0003] Existing traditional manual processing methods have many obvious drawbacks: large space requirements, as manual grinding and spraying require separate work areas, and the turnover and placement of 6-meter-long round pipes occupy a large amount of workshop space, resulting in low space utilization; cumbersome and inefficient operation, requiring multiple flipping and secondary turning, making the processing of a single pipe time-consuming, labor-intensive, and lacking continuity in manual operation, with time-consuming process connections; unstable processing quality, as manual operation is greatly affected by experience and physical strength, resulting in uneven grinding and rust removal, inconsistent paint thickness, and difficulty in guaranteeing product qualification rate; high labor costs, as the processing and placement of single pipes is time-consuming, continuous operation cannot be achieved, overall production efficiency is low, and it cannot meet the needs of large-scale and efficient pipe processing.

[0004] Therefore, we propose an automatic pipe grinding and spraying method and device. Summary of the Invention

[0005] (a) Technical problems to be solved

[0006] To address the shortcomings of existing technologies, this invention provides an automatic pipe grinding and spraying method and apparatus, which solves the problems of high labor intensity and low work efficiency in existing traditional manual processing methods.

[0007] (II) Technical Solution

[0008] To achieve the above objectives, the present invention provides the following technical solution: an automatic pipe grinding and spraying device, comprising a frame, a positioning component, a support component, a grinding component, a spraying component, and a limiting component. The frame includes a first base and a second base. A first support column is fixedly installed on the top of the first base, and a second support column is fixedly installed on the top of the second base. A top frame is fixedly installed on the top of the first and second support columns. A movable frame is slidably installed on the top frame. A traveling component for driving the movable frame to move is provided on the movable frame. The support component, the grinding component, and the spraying component are all disposed on the movable frame.

[0009] The positioning assembly includes two rotating centers rotatably mounted on a first base and two telescopic centers slidably mounted on a second base. The first base is provided with a rotary drive mechanism for driving the rotating centers to rotate. A support cylinder is fixedly mounted on the top of the second base. The telescopic centers slide through the support cylinder, and a spring for pushing the telescopic centers is provided in the support cylinder. A limit ring is fixedly sleeved on the rear end of the telescopic centers. A foot pedal mechanism for controlling the telescopic centers is provided in the second base.

[0010] The supporting assembly includes a mounting frame fixedly installed at the bottom of the movable frame, a hanger fixedly installed at the bottom of the mounting frame, a bracket hinged to the lower end of the hanger, a plurality of pulleys rotatably installed on the inner side of the bracket, and a first cylinder hinged to the inner side of the hanger, with the piston end of the first cylinder hinged to the bracket.

[0011] The grinding assembly includes a second cylinder fixedly installed at the bottom of the movable frame and a grinding machine fixedly installed at the lower end of the second cylinder;

[0012] The spraying assembly includes a material tank, a diaphragm pump, a dispensing valve, and a spray gun, all fixedly mounted on the top of the movable frame. The material tank, diaphragm pump, dispensing valve, and spray gun are connected in sequence via conduits.

[0013] The limiting components include a bracket limit switch, a grinding limit switch, a spray gun limit switch, and an equipment limit switch, all mounted on the movable frame.

[0014] Preferably, a connecting compartment is fixedly installed between the first base and the second base.

[0015] Preferably, the bottom of both sides of the first and second bases are provided with detachable casters.

[0016] Preferably, the walking assembly includes a motor fixedly mounted on the top of the mobile frame and a gear fixedly mounted on the output end of the motor. A rack is fixedly mounted on the top of the top frame, and the gear meshes with the rack.

[0017] Preferably, the top of the top frame is fixedly connected to two rows of parallel guide rails, and the movable frame is slidably mounted on the guide rails.

[0018] Preferably, the foot pedal mechanism includes a lever frame hinged to the second base via a pivot. The upper end of the lever frame is sleeved on the outside of the telescopic center. One end of the lever frame is hinged to a vertical rod, and the lower end of the vertical rod is hinged to a foot pedal. One end of the foot pedal is hinged to the second base, and the other end of the foot pedal is fixedly connected to a pedal.

[0019] Preferably, the first support column is provided with a machine start-up limit plate and a grinding start-up limit plate in sequence.

[0020] Preferably, the second support column is provided with a bracket stop limit plate, a grinding stop limit plate, a spraying stop limit plate and an equipment stop limit plate in sequence.

[0021] An automated pipe grinding and spraying method includes the following steps:

[0022] Step S1: Place the round tube between the rotating center and the telescopic center, so that the rotating center and the telescopic center abut against both ends of the round tube respectively;

[0023] Step S2: Start the equipment by using the equipment motion switch. The motor receives a reverse signal, which causes the motor to drive the gear to rotate in the opposite direction. The gear then rolls in the opposite direction along the rack, causing the moving frame to return to its starting position.

[0024] Step S3: When the mobile frame drives the equipment limit switch to touch the equipment start limit plate, the mobile frame returns to the initial position. At this time, the rotary drive mechanism, motor and first cylinder receive signals. The rotary drive mechanism drives the rotating tip to rotate, which in turn drives the round tube to rotate. The equipment enters the work preparation state. At the same time, the motor drives the gear to rotate in the forward direction, which causes the gear to roll in the forward direction along the rack, driving the mobile frame to run in the forward direction. At the same time, the first cylinder works, which drives the bracket to rotate and rise, so that the pulley on the bracket supports the round tube and provides stable support for the round tube.

[0025] Step S4: When the moving frame drives the grinding limit switch to touch the grinding start limit plate, the second cylinder and the grinding machine are controlled by the electronic control signal to work, so that the second cylinder drives the grinding machine to fall, and the grinding machine grinds and removes rust from the surface of the round tube in all directions.

[0026] Step S5: After the grinding operation continues for a few seconds, the spraying component is automatically triggered to start, and the spray gun performs a synchronous spraying operation on the surface of the round tube in all directions.

[0027] Step S6: After approximately 10 seconds of operation, when the moving frame drives the bracket limit switch to touch the bracket stop limit plate, the first cylinder drives the bracket to fall. When the moving frame drives the grinding limit switch to touch the grinding stop limit plate, the grinding machine stops working. The second cylinder drives the grinding machine to rise. When the moving frame drives the spray gun limit switch to touch the spraying stop limit plate, the spray gun stops working, and the spraying ends. When the moving frame drives the equipment limit switch to touch the equipment stop limit plate, the equipment stops completely.

[0028] Step S7: The worker can step on the pedal, causing the pedal to rotate the pedal downwards. Then, the pedal will cause the vertical rod to descend, causing the vertical rod to rotate the actuating frame around the pivot. This will cause the actuating frame to move the limiting ring, which will then cause the telescopic tip to retract. The round tube can then be removed.

[0029] (III) Beneficial Effects

[0030] Compared with the prior art, the present invention provides an automatic pipe grinding and spraying method and apparatus, which has the following beneficial effects:

[0031] 1. This invention integrates the grinding and spraying processes into a single piece of equipment, eliminating the need for separate grinding and spraying areas. This significantly reduces workshop space requirements, improves space utilization, and solves the problems of traditional manual operations being scattered and requiring large areas.

[0032] 2. This invention drives the round tube to rotate at a constant speed and travel axially, so that the grinding and spraying of the entire circumference and length of the round tube can be completed in one feeding. This completely eliminates the traditional manual repeated flipping and secondary reverse operation, simplifies the operation process and improves work efficiency. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0034] Figure 2 For the present invention Figure 1 Enlarged view of the structure at point A in the middle;

[0035] Figure 3 This is a schematic diagram of the telescopic tip of the present invention.

[0036] In the picture:

[0037] 1. Frame; 11. First base; 12. Second base; 13. First support column; 14. Second support column; 15. Top frame; 16. Moving frame; 17. Traveling assembly; 171. Motor; 172. Gear; 173. Rack; 18. Connecting compartment; 19. Casters; 110. Guide rail;

[0038] 2. Positioning assembly; 21. Rotating center; 22. Telescopic center; 23. Support cylinder; 24. Limiting ring; 25. Foot pedal mechanism; 251. Rotating shaft; 252. Actuating bracket; 253. Vertical rod; 254. Step bar; 255. Pedal;

[0039] 3. Supporting components; 31. Mounting bracket; 32. Hanger; 33. Bracket; 34. Pulley; 35. First cylinder;

[0040] 4. Grinding assembly; 41. Second cylinder; 42. Grinding machine;

[0041] 5. Spraying components; 51. Material tank; 52. Diaphragm pump; 53. Dispensing valve; 54. Spray gun;

[0042] 6. Limiting components; 61. Bracket limit switch; 62. Grinding limit switch; 63. Spray gun limit switch; 64. Equipment limit switch; 65. Equipment start-up limit plate; 66. Grinding start-up limit plate; 67. Bracket stop limit plate; 68. Grinding stop limit plate; 69. Spraying stop limit plate; 610. Equipment stop limit plate. Detailed Implementation

[0043] In this invention, unless otherwise stated, the directional terms such as "up" and "down" generally refer to the directions shown in the accompanying drawings, or to the vertical, perpendicular, or gravitational direction; similarly, for ease of understanding and description, "left" and "right" generally refer to the left and right shown in the accompanying drawings; "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not intended to limit this invention.

[0044] This invention provides a technical solution:

[0045] Please see Figures 1-3 An automatic pipe grinding and spraying device includes a frame 1, a positioning component 2, a support component 3, a grinding component 4, a spraying component 5, and a limiting component 6. The frame 1 includes a first base 11 and a second base 12. A first support column 13 is fixedly installed on the top of the first base 11, and a second support column 14 is fixedly installed on the top of the second base 12. A top frame 15 is fixedly installed on the top of the first support column 13 and the second support column 14. A movable frame 16 is slidably installed on the top frame 15. A walking component 17 for driving the movable frame 16 is provided on the movable frame 16. The support component 3, the grinding component 4, and the spraying component 5 are all set on the movable frame 16. A connecting compartment 18 is fixedly installed between the first base 11 and the second base 12. Detachable casters 19 are provided on the bottom of both sides of the first base 11 and the second base 12. The casters 19 facilitate the movement of the frame 1.

[0046] Specifically, the walking assembly 17 includes a motor 171 fixedly mounted on the top of the movable frame 16 and a gear 172 fixedly mounted on the output end of the motor 171. A rack 173 is fixedly mounted on the top of the top frame 15, and the gear 172 meshes with the rack 173. Two rows of parallel guide rails 110 are fixedly connected to the top of the top frame 15. The movable frame 16 is slidably mounted on the guide rails 110. By setting the walking assembly 17, the motor 171 can be started to drive the gear 172 to rotate, so that the gear 172 rolls along the rack 173, thereby driving the movable frame 16 to move along the guide rails 110.

[0047] Specifically, the positioning component 2 includes two rotating tips 21 rotatably mounted on the first base 11 and two telescopic tips 22 slidably mounted on the second base 12. The first base 11 is equipped with a rotary drive mechanism for driving the rotating tips 21 to rotate; the rotary drive mechanism is a speed-adjustable rotary motor. A support cylinder 23 is fixedly mounted on the top of the second base 12. The telescopic tips 22 slide through the support cylinder 23, and a spring for pushing the telescopic tips 22 is provided inside the support cylinder 23. The rear end is fixedly sleeved with a limit ring 24. The second base 12 is provided with a foot pedal mechanism 25 for controlling the telescopic tip 22. The foot pedal mechanism 25 includes a toggle frame 252 hinged to the second base 12 via a pivot 251. The upper end of the toggle frame 252 is sleeved on the outside of the telescopic tip 22. One end of the toggle frame 252 is hinged to a vertical rod 253. The lower end of the vertical rod 253 is hinged to a foot pedal 254. One end of the foot pedal 254 is hinged to the second base 12. The other end of the foot pedal 254 is fixedly connected to a pedal 255.

[0048] Both the rotating tip 21 and the telescopic tip 22 have grooved die tips. When removing the tube, a special tool is used to enter the tube along the groove, making it easy to remove the tube. Moreover, the grooved die tips of the rotating tip 21 and the telescopic tip 22 can be removed and replaced with different sizes.

[0049] Specifically, the support assembly 3 includes a mounting bracket 31 fixedly installed at the bottom of the movable frame 16. A hanger 32 is fixedly installed at the bottom of the mounting bracket 31. A bracket 33 is hinged to the lower end of the hanger 32. Multiple pulleys 34 are rotatably installed on the inner side of the bracket 33. A first cylinder 35 is hinged to the inner side of the hanger 32. The piston end of the first cylinder 35 is hinged to the bracket 33.

[0050] Specifically, the polishing assembly 4 includes a second cylinder 41 fixedly installed at the bottom of the movable frame 16 and a polisher 42 fixedly installed at the lower end of the second cylinder 41.

[0051] Specifically, the spraying assembly 5 includes a material tank 51 fixedly mounted on the top of the movable frame 16, a diaphragm pump 52, a dispensing valve 53, and a spray gun 54 fixedly mounted on the other end of the mounting frame 31. The material tank 51, the diaphragm pump 52, the dispensing valve 53, and the spray gun 54 are connected in sequence through conduits.

[0052] Specifically, the limiting component 6 includes a bracket limit switch 61, a grinding limit switch 62, a spray gun limit switch 63, and an equipment limit switch 64, which are installed on the movable frame 16. The first support column 13 is provided with an equipment start limit plate 65 and a grinding start limit plate 66 in sequence. The second support column 14 is provided with a bracket stop limit plate 67, a grinding stop limit plate 68, a spraying stop limit plate 69, and an equipment stop limit plate 610 in sequence.

[0053] An automated pipe grinding and spraying method includes the following steps:

[0054] Step S1: Place the round tube between the rotating tip 21 and the telescopic tip 22, so that the rotating tip 21 and the telescopic tip 22 abut against the two ends of the round tube respectively;

[0055] Step S2: Start the equipment by using the equipment motion switch. The motor 171 receives a reverse signal, causing the motor 171 to drive the gear 172 to rotate in the opposite direction. The gear 172 then rolls in the opposite direction along the rack 173, causing the moving frame 16 to return to its starting position.

[0056] Step S3: When the moving frame 16 drives the equipment limit switch 64 to touch the equipment start limit plate 65, the moving frame 16 returns to the initial position. At this time, the rotary drive mechanism, motor 171 and first cylinder 35 receive signals and drive the rotating tip 21 to rotate through the rotary drive mechanism, so that the rotating tip 21 drives the round tube to rotate, and the equipment enters the work preparation state. At the same time, the motor 171 drives the gear 172 to rotate in the forward direction, so that the gear 172 rolls in the forward direction along the rack 173, driving the moving frame 16 to run in the forward direction. At the same time, the first cylinder 35 works, so that the first cylinder 35 drives the bracket 33 to rotate and rise, so that the pulley 34 on the bracket 33 supports the round tube and provides stable support for the round tube.

[0057] Step S4: When the moving frame 16 drives the grinding limit switch 62 to touch the grinding start limit plate 66, the second cylinder 41 and the grinding machine 42 are controlled by the electronic control signal to work, so that the second cylinder 41 drives the grinding machine 42 to fall, and the grinding machine 42 performs all-round grinding and rust removal on the surface of the round tube.

[0058] Step S5: After the grinding operation lasts for 3 seconds, the spraying component 5 is automatically triggered to start, and the spray gun 54 performs a synchronous spraying operation on the surface of the round tube in all directions.

[0059] Step S6: After running for approximately 30 seconds, when the moving frame 16 drives the bracket travel switch 61 to touch the bracket stop limit plate 67, the first cylinder 35 drives the bracket 33 to fall. When the moving frame 16 drives the grinding travel switch 62 to touch the grinding stop limit plate 68, the grinding machine 42 stops working, and the second cylinder 41 drives the grinding machine 42 to rise. When the moving frame 16 drives the spray gun travel switch 63 to touch the spraying stop limit plate 69, the spray gun 54 stops working, and the spraying ends. When the moving frame 16 drives the equipment travel switch 64 to touch the equipment stop limit plate 610, the equipment stops completely.

[0060] Step S7: The worker can step on the pedal 255, causing the pedal 255 to drive the pedal 254 to rotate downward. Then, the pedal 254 drives the vertical rod 253 to descend, causing the vertical rod 253 to drive the actuating frame 252 to rotate around the rotating shaft 251. The actuating frame 252 actuates the limiting ring 24, causing the limiting ring 24 to drive the telescopic tip 22 to retract. Then the round tube can be removed.

[0061] In summary, this automatic pipeline grinding and spraying method and device integrates the grinding and spraying processes into a single unit by setting up a frame 1, a positioning component 2, a supporting component 3, a grinding component 4, a spraying component 5, and a limiting component 6. This eliminates the need for separate grinding and spraying areas, significantly reducing workshop space occupation, improving space utilization, reducing manual labor intensity, and increasing work efficiency.

[0062] The above are merely specific embodiments of the present invention, but the technical features of the present invention are not limited thereto. Any simple changes, equivalent substitutions, or modifications made based on the present invention to solve essentially the same technical problems and achieve essentially the same technical effects are all covered within the protection scope of the present invention.

Claims

1. An automatic pipe grinding and spraying device, comprising a frame (1), a positioning component (2), a supporting component (3), a grinding component (4), a spraying component (5), and a limiting component (6), characterized in that: The frame (1) includes a first base (11) and a second base (12). A first support column (13) is fixedly installed on the top of the first base (11), and a second support column (14) is fixedly installed on the top of the second base (12). A top frame (15) is fixedly installed on the top of the first support column (13) and the second support column (14). A movable frame (16) is slidably installed on the top frame (15). A walking component (17) for driving the movable frame (16) to move is provided on the movable frame (16). The supporting component (3), the grinding component (4) and the spraying component (5) are all provided on the movable frame (16). The positioning component (2) includes two rotating tips (21) rotatably mounted on a first base (11) and two telescopic tips (22) slidably mounted on a second base (12). The first base (11) is provided with a rotary drive mechanism for driving the rotating tips (21) to rotate. A support cylinder (23) is fixedly mounted on the top of the second base (12). The telescopic tips (22) slide through the support cylinder (23). A spring for pushing the telescopic tips (22) is provided in the support cylinder (23). A limit ring (24) is fixedly sleeved on the rear end of the telescopic tips (22). A foot pedal mechanism (25) for controlling the telescopic tips (22) is provided in the second base (12). The supporting assembly (3) includes a mounting frame (31) fixedly installed at the bottom of the movable frame (16). A hanger (32) is fixedly installed at the bottom of the mounting frame (31). A bracket (33) is hinged to the lower end of the hanger (32). Multiple pulleys (34) are rotatably installed on the inner side of the bracket (33). A first cylinder (35) is hinged to the inner side of the hanger (32). The piston end of the first cylinder (35) is hinged to the bracket (33). The polishing assembly (4) includes a second cylinder (41) fixedly installed at the bottom of the movable frame (16) and a polisher (42) fixedly installed at the lower end of the second cylinder (41). The spraying assembly (5) includes a material tank (51), a diaphragm pump (52), a dispensing valve (53) fixedly mounted on the top of the movable frame (16), and a spray gun (54) fixedly mounted on the other end of the mounting frame (31). The material tank (51), the diaphragm pump (52), the dispensing valve (53) and the spray gun (54) are connected in sequence through a conduit. The limiting component (6) includes a bracket limit switch (61), a grinding limit switch (62), a spray gun limit switch (63), and an equipment limit switch (64) disposed on the moving frame (16).

2. The automatic pipe grinding and spraying device according to claim 1, characterized in that: A connecting compartment (18) is fixedly installed between the first base (11) and the second base (12).

3. The automatic pipe grinding and spraying device according to claim 1, characterized in that: The bottom of both sides of the first base (11) and the second base (12) are provided with detachable casters (19).

4. The automatic pipe grinding and spraying device according to claim 1, characterized in that: The walking assembly (17) includes a motor (171) fixedly mounted on the top of the moving frame (16) and a gear (172) fixedly mounted on the output end of the motor (171). A rack (173) is fixedly mounted on the top of the top frame (15), and the gear (172) meshes with the rack (173).

5. The automatic pipe grinding and spraying device according to claim 1, characterized in that: The top of the top frame (15) is fixedly connected to two rows of parallel guide rails (110), and the movable frame (16) is slidably mounted on the guide rails (110).

6. The automatic pipe grinding and spraying device according to claim 1, characterized in that: The foot pedal mechanism (25) includes a lever (252) hinged to the second base (12) via a pivot (251). The upper end of the lever (252) is sleeved on the outside of the telescopic tip (22). One end of the lever (252) is hinged to a vertical rod (253). The lower end of the vertical rod (253) is hinged to a foot pedal (254). One end of the foot pedal (254) is hinged to the second base (12), and the other end of the foot pedal (254) is fixedly connected to a pedal (255).

7. The automatic pipe grinding and spraying device according to claim 1, characterized in that: The first support column (13) is provided with a machine start-up limit plate (65) and a grinding start-up limit plate (66) in sequence.

8. The automatic pipe grinding and spraying device according to claim 1, characterized in that: The second support column (14) is provided with a bracket stop limit plate (67), a grinding stop limit plate (68), a spraying stop limit plate (69) and an equipment stop limit plate (610) in sequence.

9. An automatic pipe grinding and spraying method, employing the automatic pipe grinding and spraying device according to any one of claims 1-8, characterized in that, Includes the following steps: Step S1: Place the round tube between the rotating tip (21) and the telescopic tip (22), so that the rotating tip (21) and the telescopic tip (22) abut against the two ends of the round tube respectively; Step S2: Start the equipment by using the equipment motion switch. The motor (171) receives a reverse signal, causing the motor (171) to drive the gear (172) to rotate in the opposite direction. This causes the gear (172) to roll in the opposite direction along the rack (173), which in turn drives the moving frame (16) to return to its starting position. Step S3: When the moving frame (16) drives the equipment limit switch (64) to touch the equipment start limit plate (65), the moving frame (16) returns to the initial position. At this time, the rotary drive mechanism, motor (171) and first cylinder (35) receive signals and drive the rotating tip (21) to rotate through the rotary drive mechanism, so that the rotating tip (21) drives the round tube to rotate and the equipment enters the work preparation state. At the same time, the motor (171) drives the gear (172) to rotate in the forward direction, so that the gear (172) rolls in the forward direction along the rack (173), driving the moving frame (16) to run in the forward direction. At the same time, the first cylinder (35) works, so that the first cylinder (35) drives the bracket (33) to rotate and rise, so that the pulley (34) on the bracket (33) supports the round tube and provides stable support for the round tube. Step S4: When the moving frame (16) drives the grinding limit switch (62) to touch the grinding start limit plate (66), the second cylinder (41) and the grinding machine (42) are controlled by the electronic control signal to work, so that the second cylinder (41) drives the grinding machine (42) to fall, so that the grinding machine (42) grinds and removes rust from the surface of the round tube in all directions. Step S5: After the grinding operation lasts for 3 seconds, the spraying component (5) is automatically triggered to start, and the surface of the round tube is sprayed synchronously in all directions through the spray gun (54). Step S6: After running for about 30 seconds, when the moving frame (16) drives the bracket travel switch (61) to touch the bracket stop limit plate (67), the first cylinder (35) drives the bracket (33) to fall. When the moving frame (16) drives the grinding travel switch (62) to touch the grinding stop limit plate (68), the grinding machine (42) stops working. The second cylinder (41) drives the grinding machine (42) to rise. When the moving frame (16) drives the spray gun travel switch (63) to touch the spraying stop limit plate (69), the spray gun (54) stops working and the spraying ends. When the moving frame (16) drives the equipment travel switch (64) to touch the equipment stop limit plate (610), the equipment stops completely. Step S7: The worker can step on the pedal (255) to make the pedal (255) drive the pedal (254) to rotate downward. Then, the pedal (254) drives the vertical rod (253) to descend, causing the vertical rod (253) to drive the actuating frame (252) to rotate around the rotating shaft (251), causing the actuating frame (252) to actuate the limiting ring (24), causing the limiting ring (24) to drive the telescopic tip (22) to retract, and then the round tube can be removed.

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