Internal and external integrated cleaning device for steel pipe

The integrated cleaning device for steel pipes, which combines a water collection frame and a cleaning brush roller, solves the problem of cleaning dead corners on the inner wall of steel pipes, achieving a comprehensive cleaning effect on both the inner and outer walls, and is suitable for steel pipes of different lengths.

CN224143091UActive Publication Date: 2026-04-21SHANGHAI HONGLUN QIXIN TECHNOLOGY CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
SHANGHAI HONGLUN QIXIN TECHNOLOGY CO LTD
Filing Date
2025-05-21
Publication Date
2026-04-21

AI Technical Summary

Technical Problem

In existing technologies, it is difficult to effectively clean the dead corners of the inner wall of steel pipes, resulting in incomplete cleaning.

Method used

A steel pipe internal and external integrated cleaning device was designed, which adopts a combination structure of water collection frame and cleaning brush roller. The water collection frame extends into the inside and outside of the steel pipe to collect wastewater, and the cleaning brush roller rotates to clean, combined with the sleeve spraying cleaning water, which can adapt to steel pipes of different lengths.

Benefits of technology

It achieves comprehensive cleaning of the inner and outer walls of steel pipes, avoids wastewater sedimentation, improves cleaning effect, and adapts to the cleaning needs of steel pipes of different sizes.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model discloses a steel pipe inside and outside integrated cleaning device, and belongs to the technical field of steel pipe machining devices. Comprising a rack, and a three-legged chuck is rotationally arranged on the rack; the electric sliding rail is fixed on the rack; the sliding block is mounted on the electric sliding rail in a sliding manner; the two sets of cleaning assemblies are arranged on the sliding block in an up-down distribution mode and used for cleaning the inner wall and the outer wall of the steel pipe correspondingly; the water collecting frame is movably arranged on the sliding block and is provided with an upward opening; and the cleaning brush roller is rotationally arranged in the water collecting frame, is located at the opening of the water collecting frame and abuts against the wall face of the steel pipe for cleaning. The steel pipe inside and outside integrated cleaning device has the beneficial effects that by arranging the two water collecting frames, during cleaning, one water collecting frame extends into the steel pipe, the other water collecting frame is located on the lower side of the steel pipe, cleaning wastewater is collected, and the situation that the cleaning effect is affected due to the fact that the wastewater is gathered on the inner side of the steel pipe and precipitates in the steel pipe is avoided.
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Description

Technical Field

[0001] This application relates to the field of steel pipe processing equipment technology, and more specifically, to an integrated internal and external cleaning device for steel pipes. Background Technology

[0002] Steel pipes are hollow steel materials whose length is much greater than their diameter or circumference. They are widely used in various fields, categorized by application such as pipelines, engineering structures, thermal equipment, petrochemical industries, machinery manufacturing, geological drilling, and high-pressure equipment. During steel pipe processing, cleaning is necessary to remove impurities and debris. Current pipe cleaning methods, to ensure efficiency, often involve passing the pipe through cleaning equipment while it is still in motion. However, this method only cleans the outer surface of the pipe, leaving the inner wall untouched, resulting in significant cleaning dead zones.

[0003] Therefore, a steel pipe cleaning device that integrates internal and external cleaning is needed to solve the above problems. Utility Model Content

[0004] The summary section of this application is intended to provide a brief overview of the concepts, which will be described in detail in the detailed description section below. This summary section is not intended to identify key or essential features of the claimed technical solutions, nor is it intended to limit the scope of the claimed technical solutions.

[0005] To address the technical problems mentioned in the background section, some embodiments of this application provide an integrated internal and external cleaning device for steel pipes, comprising: a frame, a tripod rotatably mounted on the frame, and a motor driving the tripod chuck to rotate within the frame; an electric slide rail fixed to the frame; a sliding block slidably mounted on the electric slide rail; and a cleaning assembly comprising two sets of vertically distributed cleaning components on the sliding block, used for cleaning the inner and outer walls of the steel pipe respectively; the cleaning assembly includes: a water collection frame movably mounted on the sliding block and having an upward opening, a cylinder fixedly mounted within the sliding block, the piston rod end of the cylinder connected to the water collection frame, and the cylinder driving the water collection frame to move; and a cleaning brush roller. The first sleeve is rotatably installed inside the water collection frame and located at the opening of the water collection frame, abutting against the steel pipe wall for cleaning; the second sleeve is fixed inside the sliding block and has multiple water outlet holes facing the steel pipe wall; the third sleeve is coaxially slidably installed inside the first sleeve and connected to the first sleeve, with one end of the second sleeve extending out of the first sleeve to adjust the overall length of the first and second sleeves, and the second sleeve also has water outlet holes facing the steel pipe wall; the fourth cleaning water tank is fixedly installed on the sliding block and is equipped with a water pump, the water outlet of which is connected to the first sleeve through a hose, transporting the cleaning water in the cleaning water tank to the first sleeve and spraying it out through the water outlet holes.

[0006] Two sets of cleaning components are used to clean the inner and outer walls of the steel pipe respectively. During cleaning, one water collection frame extends into the steel pipe, while the other is located on the lower side of the steel pipe to collect the cleaning wastewater, preventing it from accumulating and settling inside the steel pipe, which would affect the cleaning effect. At the same time, the cleaning brush rollers rotate to scrub the steel pipe wall. In conjunction with the first and second sets of pipes, cleaning water is sprayed onto the steel pipe wall to ensure the cleaning effect.

[0007] Furthermore, the water collection frame includes an outer frame and an inner frame. A connecting part is provided on the outer frame. The piston rod end of the cylinder is fixed on the connecting part. One end of the first sleeve is fixedly connected to the connecting part. The inner frame and the outer frame are slidably engaged. The inner frame slides out of the outer frame to adjust the overall length of the inner frame and the outer frame. One end of the second sleeve is fixed on the inner frame.

[0008] The outer and inner frames allow for flexible adjustment of the overall length of the water collection frame when cleaning steel pipes of different lengths. This is achieved by extending the outer frame beyond the inner frame, thus adjusting the first and second sleeves to the appropriate lengths. This enables the first and second sleeves to spray water onto the steel pipe walls, preventing the cleaning water from splashing onto the outside.

[0009] Furthermore, a wastewater box is fixedly installed at the lower end of the outer frame, and the wastewater collected in the outer frame flows into the wastewater box. A second motor is fixedly connected to the outer frame, and a threaded shaft located inside the outer frame is fixedly connected to the power output end of the second motor. A fixed threaded sleeve is fixedly connected to the inner frame, and the threaded shaft and the fixed threaded sleeve are threadedly engaged.

[0010] With the second motor installed, wastewater is collected in the collection frame and then flows into the wastewater box for easy treatment.

[0011] Furthermore, the cleaning brush roller is rotatably engaged with the inner frame. One end of the cleaning brush roller has an end that extends out of the inner frame, and a first gear is fixedly connected to the end. A first motor is fixedly connected to the inner frame, and a second gear is fixedly connected to the power output end of the first motor. The second gear meshes with the first motor.

[0012] The first gear, along with the first motor and the second gear, drives the cleaning brush roller to rotate, thereby achieving the cleaning of the steel pipe wall.

[0013] Furthermore, a support part is fixedly connected to one end of the outer frame, and a sliding support head is slidably connected to the support part. One end of the cleaning brush roller is rotatably engaged with the sliding support head.

[0014] With the support part and sliding support head set up, when the overall length of the water collection frame is adjusted, the sliding support head slides on the support part to provide support for the cleaning brush roller.

[0015] Furthermore, sliding baffles are slidably provided on both the outer frame and the inner frame, and protrusions are fixedly provided on both the outer frame and the inner frame. A spring is connected between the protrusion and the sliding baffle, and the two ends of the spring are fixedly connected to the sliding baffle and the protrusion, respectively.

[0016] By using a sliding baffle, when the water collection frame approaches the steel pipe wall, the sliding baffle blocks the flow, preventing gaps between the frame and the steel pipe that could lead to wastewater leakage.

[0017] Furthermore, a rolling column is rotatably installed at the end of the sliding baffle near the steel pipe wall, and the rolling column rolls against the steel pipe wall.

[0018] The rolling column design prevents the sliding baffle from directly contacting and rubbing against the pipe, thus avoiding damage to the pipe.

[0019] Furthermore, the sliding block has a slot for the support to pass through.

[0020] The beneficial effects of this application are as follows:

[0021] 1. By setting up two water collection frames, during cleaning, one water collection frame extends into the steel pipe, and the other water collection frame is located on the lower side of the steel pipe to collect the cleaning wastewater, so as to avoid the wastewater from accumulating and settling inside the steel pipe, which would affect the cleaning effect.

[0022] 2. The cleaning brush rollers are set up to clean the steel pipe wall by rotating. In conjunction with the first and second sleeves, the cleaning water is sprayed onto the steel pipe wall to ensure the cleaning effect.

[0023] 3. By setting the outer frame and inner frame, when cleaning steel pipes of different lengths, the length of the outer frame extends beyond the inner frame, and the overall length of the water collection frame can be flexibly adjusted. This allows the first and second sleeves to be adjusted to the appropriate lengths, so that the first and second sleeves can spray the steel pipe wall and prevent the cleaning water from spraying onto the outside.

[0024] 4. By setting up a sliding baffle, when the water collection frame approaches the steel pipe wall, the sliding baffle will block it, preventing gaps between the frame and the steel pipe that could cause wastewater to leak out. Attached Figure Description

[0025] The accompanying drawings, which form part of this application, are used to provide a further understanding of the application and to make other features, objects, and advantages of the application more apparent. The illustrative embodiments and descriptions of this application are used to explain the application and do not constitute an undue limitation of the application.

[0026] Furthermore, throughout the accompanying drawings, the same or similar reference numerals denote the same or similar elements. It should be understood that the drawings are schematic, and the elements are not necessarily drawn to scale.

[0027] In the attached diagram:

[0028] Figure 1 This is an overall schematic diagram according to one embodiment of the present application;

[0029] Figure 2 yes Figure 1 A schematic diagram of the sliding block installation structure in the embodiment;

[0030] Figure 3 yes Figure 1 The installation diagram of the water collection frame in the embodiment is shown below;

[0031] Figure 4 yes Figure 1 The structural diagram of the outer frame and inner frame in the embodiment is shown below;

[0032] Figure 5 yes Figure 1 The embodiment is shown in the installation diagram of the threaded shaft and the fixed threaded sleeve.

[0033] Figure 6 yes Figure 1 The installation diagram of the second motor in the embodiment is shown below;

[0034] Figure 7 yes Figure 1 The installation diagram of the sliding baffle in the embodiment is shown below;

[0035] Figure 8 yes Figure 1 A schematic diagram of the cross-section of the sliding baffle and the rolling column in the embodiment.

[0036] Figure label:

[0037] 10. Frame; 11. Tripod chuck; 12. Sliding block; 13. Water collection frame; 14. Cylinder; 15. Connecting part; 16. Outer frame; 17. Inner frame; 18. First gear; 19. First motor; 20. Second gear; 21. Support part; 22. Sliding support head; 23. First sleeve; 24. Second sleeve; 25. Second motor; 26. Threaded shaft; 27. Fixed threaded sleeve; 28. Electric slide rail; 29. ​​Cleaning water tank; 30. Sliding baffle; 31. Protrusion; 32. Spring; 33. Rolling column; 34. Groove; 35. Wastewater box; 36. Cleaning brush roller. Detailed Implementation

[0038] Embodiments of this disclosure will now be described in more detail with reference to the accompanying drawings. While some embodiments of this disclosure are shown in the drawings, it should be understood that this disclosure can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of this disclosure. It should be understood that the accompanying drawings and embodiments of this disclosure are for illustrative purposes only and are not intended to limit the scope of protection of this disclosure.

[0039] It should also be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings. Unless otherwise specified, the embodiments and features described in this disclosure can be combined with each other.

[0040] It should be noted that the concepts of "first" and "second" mentioned in this disclosure are used only to distinguish different devices, modules or units, and are not used to limit the order of functions performed by these devices, modules or units or their interdependencies.

[0041] It should be noted that the terms "a" and "a plurality of" used in this disclosure are illustrative rather than restrictive, and those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".

[0042] This disclosure will now be described in detail with reference to the accompanying drawings and embodiments.

[0043] Reference Figure 1-8A steel pipe internal and external integrated cleaning device includes: a frame 10, a tripod chuck 11, an electric slide rail 28, a sliding block 12, a water collection frame 13, a cylinder 14, a cleaning brush roller 36, a first sleeve 23, a second sleeve 24, and a cleaning water tank 29. The tripod chuck 11 is rotatably mounted on the frame 10. A motor for driving the tripod chuck 11 to rotate is also located within the frame 10. The tripod chuck 11, referencing existing technology, clamps one end of the steel pipe, enabling the steel pipe to rotate. An electric slide rail 28 is also fixedly mounted on the frame 10. A sliding block 12 is slidably connected to the electric slide rail 28, facing the tripod chuck 11. The sliding block 12 moves closer to or further away from the tripod chuck 11 via the electric slide rail 28. Two water collection frames 13 are provided on the sliding block 12, arranged vertically. Two sets of cylinders 14 are fixedly connected inside the sliding block 12, and the piston rods of the two sets of cylinders 14 are respectively connected to the two water collection frames 13, driving the water collection frames 13 to move up and down through the cylinders 14. When cleaning, one end of the steel pipe is clamped on the tripod chuck 11, and then the sliding block 12 is moved closer to the tripod chuck 11, so that one of the water collection frames 13 is inserted into the steel pipe with its opening facing upward and close to the upper end of the inner wall of the steel pipe. The other water collection frame 13 is located on the lower side of the steel pipe with its opening facing upward and close to the lower end of the outer wall of the steel pipe. The water collection frame 13 includes an outer frame 16 and an inner frame 17. Both the outer frame 16 and the inner frame 17 have a concave cross-section. The outer frame 16 and the inner frame 17 are fitted together and slidably connected. When the inner frame 17 moves, it can extend out of the outer frame 16, thereby adjusting the overall length of the water collection frame 13. A wastewater box 35 is fixedly installed at the lower end of the outer frame 16. The wastewater box 35 has an opening at its upper end extending into the inner side of the outer frame 16, allowing wastewater in the water collection frame 13 to flow into the wastewater box 35. The outer frame 16 has two left and right connecting parts 15, with the piston rod end of the cylinder 14 fixedly connected to the connecting parts 15. A first sleeve 23 is fixedly connected to the connecting part 15. A second sleeve 24, which is slidably disposed inside the first sleeve 23 and communicates with it, extends along the length of the water collection frame 13. One end of the cylinder 14 is fixed to the inner frame 17, so that the first sleeve 23 moves with the inner frame 17 and slides inside the second sleeve 24, adjusting the overall length of the first sleeve 23 and the second sleeve 24 with the water collection frame 13. Water outlet holes distributed along the axis are opened on the sides of the first sleeve 23 and the second sleeve 24, with the water outlet pointing towards the steel pipe wall. A cleaning water tank 29 is provided on the water collection frame 13. The cleaning water tank 29 contains a water pump, and the water outlet end of the water pump is connected to the first sleeve 23 through a hose. The water pump delivers the cleaning water in the cleaning water tank 29 to the first sleeve 23 and the second sleeve 24 and sprays it out through the water outlet holes to rinse the inner wall of the steel pipe.A second motor 25 is fixedly connected to the outer frame 16. The power output end of the second motor 25 is fixedly connected to a threaded shaft 26 located inside the outer frame 16. A fixed threaded sleeve 27 is fixedly connected to the inner frame 17. The threaded shaft 26 passes through the fixed threaded sleeve 27 and is threadedly connected to it. The second motor 25 outputs power to drive the threaded shaft 26 to rotate, thereby causing the inner frame 17 to move, thus adjusting the overall length of the water collection frame 13 to accommodate steel pipes of different lengths.

[0044] A cleaning brush roller 36 is rotatably connected inside the water collection frame 13. One end of the cleaning brush roller 36 passes through the inner frame 17 and is rotatably connected to the inner frame 17. A first motor 19 is fixedly connected to the inner frame 17. A second gear 20 is fixedly connected to the power output end of the first motor 19. A first gear 18 that meshes with the second gear 20 is fixedly connected to one end of the cleaning brush roller 36. Power is output by the first motor 19, and the cleaning brush roller 36 is driven to rotate under the action of the second gear 20 and the first gear 18, thereby cleaning the steel pipe wall.

[0045] A support portion 21 is also fixedly connected to the outer frame portion 16, and a slot 34 is provided on the sliding block 12 for the support portion 21 to pass through. A sliding support head 22 is slidably connected to the support portion 21, and one end of the cleaning brush roller 36 is rotatably engaged with the sliding support head 22. When the second motor 25 drives the inner frame portion 17 to move, the sliding support head 22 will move on the support portion 21, and the sliding support head 22 will support the outer frame portion 16.

[0046] Sliding baffles 30 are slidably connected to both the left and right sides of the outer frame 16 and the inner frame 17. Protrusions 31 are fixed to both the outer frame 16 and the inner frame 17. Springs 32 connect the protrusions 31 and the sliding baffles 30, with both ends of the springs 32 fixedly connected to the protrusions 31 and the sliding baffles 30, respectively. When the water collection frame 13 approaches the pipe wall, the sliding baffles 30 block both sides of the water collection frame 13, preventing wastewater from flowing out from the gap between the water collection frame 13 and the pipe. The two sliding baffles 30 on the outer frame 16 are located on the outside of the outer frame 16, and the two sliding baffles 30 on the inner frame 17 are located on the inside of the inner frame 17, ensuring that the movement of the inner frame 17 is not obstructed.

[0047] A rolling column 33 is rotatably connected to one end of the sliding baffle 30 near the pipe wall. When the water collection frame 13 approaches the pipe wall to prepare for cleaning, the rolling column 33 abuts against the pipe wall, and the pipe wall comes into direct contact with the sliding baffle 30, causing damage to the pipe.

[0048] Working process or usage method:

[0049] 1. During cleaning, one end of the steel pipe is clamped onto the tripod chuck 11, and the sliding block 12 moves toward the tripod chuck 11 via the electric slide rail 28. One water collection frame 13 is inserted into the steel pipe, and the other water collection frame 13 is located on the lower side of the steel pipe. The position of the water collection frame 13 is adjusted by controlling the cylinder 14, so that the water collection frame 13 inside the steel pipe is close to the upper side of the inner wall of the steel pipe, and the water collection frame 13 on the lower side of the steel pipe is close to the lower side of the outer wall of the steel pipe. At this time, the rolling column 33 abuts against the steel pipe wall. The spring 32 can adapt to steel pipes of different sizes. By starting the second motor 25, power is output to drive the inner frame 17 to move, adjusting the overall length of the water collection frame 13 so that the overall length of the water collection frame 13 is consistent with the steel pipe, so as to achieve a comprehensive cleaning of the steel pipe. While the length of the water collection frame 13 is adjusted, the sliding support head 22 moves, and the second sleeve 24 extends and retracts within the first sleeve 23, also adapting to the length of the steel pipe.

[0050] 2. During cleaning, the tripod chuck 11 is driven to rotate, which in turn drives the steel pipe to rotate. At the same time, the first motor 19 is started to output power, which drives the second gear 20 to rotate. In turn, the first gear 18 drives the cleaning brush roller 36 to rotate, which scrubs the wall of the steel pipe to ensure the cleaning effect. The cleaning water tank 29 and the water pump in the cleaning water tank 29 make the cleaning liquid sprayed out from the water outlet of the second sleeve 24 and the first sleeve 23, which works with the cleaning brush roller 36 to scrub. The wastewater after scrubbing will be collected in the water collection frame 13 and finally flow into the wastewater box 35 for collection.

[0051] The above description is merely a selection of preferred embodiments of this disclosure and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in the embodiments of this disclosure is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the above-described inventive concept. For example, technical solutions formed by substituting the above-described features with (but not limited to) technical features with similar functions disclosed in the embodiments of this disclosure.

Claims

1. A device for cleaning the inside and outside of a steel pipe in one operation, characterized by ,include: A frame (10) is provided with a tripod chuck (11) rotatably mounted on the frame (10), and a motor is provided inside the frame (10) to drive the tripod chuck (11) to rotate. Electric slide rail (28) is fixed on the frame (10); The sliding block (12) is slidably mounted on the electric slide rail (28); The cleaning assembly has two sets of components arranged vertically on the sliding block (12), which are used to clean the inner and outer walls of the steel pipe respectively. The cleaning components include: A water collection frame (13) is movably mounted on a sliding block (12) and has an upward opening. A cylinder (14) is fixedly mounted inside the sliding block (12). The piston rod end of the cylinder (14) is connected to the water collection frame (13), and the water collection frame (13) is moved by the cylinder (14). The cleaning brush roller (36) is rotatably set inside the water collection frame (13) and located at the opening of the water collection frame (13), abutting against the steel pipe wall for cleaning; The first sleeve (23) is fixed inside the sliding block (12), and multiple water outlet holes are provided on the first sleeve (23); The second sleeve (24) is coaxially slidably disposed inside the first sleeve (23) and communicates with the first sleeve (23). One end of the second sleeve (24) extends out of the first sleeve (23) to adjust the overall length of the first sleeve (23) and the second sleeve (24). The second sleeve (24) also has a water outlet hole facing the steel pipe wall. A cleaning water tank (29) is fixedly mounted on a sliding block (12). A water pump is installed inside the cleaning water tank (29). The water outlet of the water pump is connected to the first sleeve (23) through a hose, so as to transport the cleaning water in the cleaning water tank (29) to the first sleeve (23) and spray it out through the water outlet.

2. The integrated internal and external cleaning device for steel pipes according to claim 1, characterized in that: The water collection frame (13) includes an outer frame (16) and an inner frame (17). The outer frame (16) is provided with a connecting part (15). The piston rod end of the cylinder (14) is fixed on the connecting part (15). One end of the first sleeve (23) is fixedly connected to the connecting part (15). The inner frame (17) and the outer frame (16) are slidably engaged. The inner frame (17) slides out of the outer frame (16) to adjust the overall length of the inner frame (17) and the outer frame (16). One end of the second sleeve (24) is fixed on the inner frame (17).

3. The integrated internal and external cleaning device for steel pipes according to claim 2, characterized in that: A wastewater box (35) is fixedly installed at the lower end of the outer frame (16). Wastewater collected in the water collection frame (13) flows into the wastewater box (35). A second motor (25) is fixedly connected to the outer frame (16). A threaded shaft (26) located inside the outer frame (16) is fixedly connected to the power output end of the second motor (25). A fixed threaded sleeve (27) is fixedly connected to the inner frame (17). The threaded shaft (26) and the fixed threaded sleeve (27) are threadedly engaged.

4. The integrated internal and external cleaning device for steel pipes according to claim 3, characterized in that: The cleaning brush roller (36) is rotatably engaged with the inner frame (17). One end of the cleaning brush roller (36) extends out of the inner frame (17), and a first gear (18) is fixedly connected to the end. A first motor (19) is fixedly connected to the inner frame (17), and a second gear (20) is fixedly connected to the power output end of the first motor (19). The second gear (20) meshes with the first motor (19).

5. The integrated internal and external cleaning device for steel pipes according to claim 4, characterized in that: A support part (21) is fixedly connected to one end of the outer frame part (16), and a sliding support head (22) is slidably connected to the support part (21). One end of the cleaning brush roller (36) is rotatably engaged with the sliding support head (22).

6. The integrated internal and external cleaning device for steel pipes according to claim 5, characterized in that: Both the outer frame (16) and the inner frame (17) are slidably provided with sliding baffles (30) on both sides. Both the outer frame (16) and the inner frame (17) are fixedly provided with protrusions (31). A spring (32) is connected between the protrusions (31) and the sliding baffles (30). The two ends of the spring (32) are fixedly connected to the sliding baffles (30) and the protrusions (31) respectively.

7. The integrated internal and external cleaning device for steel pipes according to claim 6, characterized in that: A rolling column (33) is rotatably installed at one end of the sliding baffle (30) near the steel pipe wall, and the rolling column (33) rolls against the steel pipe wall.

8. The integrated internal and external cleaning device for steel pipes according to claim 7, characterized in that: The sliding block (12) has a slot (34) for the support part (21) to pass through.