Rust removal device for inner wall of large-diameter steel pipe

Abstract

The utility model discloses a large-diameter steel pipe inner wall rust removal device, which belongs to a physical rust removal device, is used for a steel pipe, and comprises a polishing wheel mounted on a connecting seat, the connecting seat penetrates through a dustproof end cover through a seat plate shaft body and then is connected with a gear mounting plate, and the gear mounting plate is positioned in a toothed plate and is coaxially arranged with the toothed plate; the toothed plate is in meshing transmission with the planetary gear through inner teeth, the dustproof end cover is rotationally connected with the toothed plate, the toothed plate is connected with the bottom plate through a plate body connecting rod, a grinding motor connected with the gear mounting plate is arranged on the bottom plate, and a bottom plate frame body with a walking motor and inner wall walking wheels is further arranged on the bottom plate. According to the technical scheme, physical rust removal of the inner wall of the large-diameter steel pipe can be achieved, follow-up anti-corrosion spraying treatment is facilitated, the labor intensity of manual treatment and harm of dust to human health can be avoided, and the situation that the production cost is increased due to complex equipment can be avoided.

Description

Technical Field

[0001] This application belongs to the field of physical rust removal devices, and more specifically, relates to a rust removal device for the inner wall of large-diameter steel pipes. Background Technology

[0002] Large-diameter steel pipes range in inner diameter from 325mm to 1200mm and have different lengths. After cleaning the inside and outside of the steel pipe, a coating can be applied to prevent corrosion.

[0003] Referring to Chinese Patent Publication No. CN119526225A, a steel pipe rust removal machine is disclosed, specifically outlining the following technical solution: It includes a base plate, a working box fixedly connected to the top of the base plate, a rotating shaft rotatably connected to the bottom of the inner wall of the working box, and a telescopic rod fixedly connected to the inner wall of the rotating shaft. It also includes a positioning mechanism, comprising a connecting ring fixedly connected to the surface of the telescopic rod, a pusher fixedly connected to the top of the connecting ring, a telescopic membrane slidably connected to slots on both sides of the connecting ring, a connecting arm fixedly connected to the end of the telescopic membrane away from the connecting ring, and a pushing belt slidably connected to the inner wall of the pusher, with the end of the pushing belt away from the pusher fixedly connected to the surface of the connecting arm. By providing the positioning mechanism, the magnetic block can magnetically attract the steel pipe's inner wall, thereby adsorbing the positioning block onto the inner wall of the steel pipe. This allows for automatic positioning of the rust removal device to the inner wall of steel pipes of different diameters.

[0004] The above structure is relatively complex, which may increase production costs during use, and it is not well adapted to large-diameter steel pipes, especially those with an inner diameter of about 1200mm.

[0005] Meanwhile, a steel pipe internal and external rust removal device is also provided in the prior art. See Chinese Patent Publication No. CN118952003A, which discloses the following technical content: A steel pipe internal and external rust removal device includes a fixing frame and a pipe body, and further includes a grinding cylinder, a grinding assembly, and an adjustment assembly. The grinding assembly includes a fixing block and a mounting block. A first grinding block for grinding the outer wall of the pipe is disposed on the side of the fixing block near the mounting block, and a second grinding block for grinding the inner wall of the pipe is disposed on the side of the mounting block near the fixing block. The adjustment assembly includes a slider disposed on the outer wall of the mounting block, an electromagnetic block disposed on the inner wall of the slider, and a strong magnetic block disposed on the side of the second grinding block near the electromagnetic block. This invention utilizes the repulsive force generated by the electromagnetic block against the strong magnetic block to cause the second grinding block to slide. The current supplied to the electromagnetic block is adjusted in real time according to the actual condition of the inner wall of the pipe, thereby adjusting the grinding force of the second grinding block, reducing unnecessary energy consumption, and preventing potential damage to the inner wall of the pipe due to excessive grinding, thus ensuring the high efficiency of the grinding work.

[0006] However, the device disclosed is a vertically installed rust removal device, which is not suitable for removing rust from the inner wall of steel pipes with an inner diameter of about 1200mm. Summary of the Invention

[0007] The purpose of this application is to provide a rust removal device for the inner wall of large-diameter steel pipes, which can achieve physical rust removal of the inner wall of 1200mm large-diameter steel pipes, facilitating subsequent anti-corrosion spraying. It can avoid the labor intensity and dust-related health hazards of manual processing, and also avoid the increased production costs caused by complex equipment.

[0008] To achieve the above objectives, this application employs the following technical solution:

[0009] The large-diameter steel pipe inner wall rust removal device described in this application includes a grinding wheel that contacts the inner wall of the steel pipe and is mounted on a connecting seat. The connecting seat is located on a base plate shaft. The base plate shaft passes through a dustproof end cover and is rotatably connected to a gear mounting plate. The gear mounting plate is located inside a gear plate and is coaxially arranged with the gear plate. The gear plate meshes with a planetary gear through internal teeth on its inner wall. The planetary gear is fixed on the base plate shaft and located within the space formed by the gear plate. The dustproof end cover is located on the side of the gear plate away from the gear mounting plate and is rotatably connected to the outer wall of the gear plate. The gear plate is connected to a base plate through a plate connecting rod. The outer diameter of the base plate is less than or equal to the outer diameter of the gear plate. A grinding motor is mounted on the base plate, and the output shaft of the grinding motor is connected to the gear mounting plate. A base plate frame is also mounted on the base plate frame, and a travel motor is mounted on the base plate frame. The output shaft of the travel motor is connected to an inner wall travel wheel.

[0010] As one of the preferred technical solutions, in this application, an auxiliary seat is also provided between adjacent connecting seats. The auxiliary seat is located outside the dustproof end cover and is flush with the connecting seat. The auxiliary seat is connected to one end of the corresponding seat plate shaft, and the other end of the seat plate shaft passes through the dustproof end cover and is rotatably connected to the gear mounting plate.

[0011] As one of the preferred technical solutions, in this application, the toothed plate is an annular plate, the inner teeth are located on the inner wall of the toothed plate, a gap is left between the outer wall of the gear mounting plate and the inner wall of the toothed plate, and the output shaft of the grinding motor is coaxially arranged with the central axis of the gear mounting plate.

[0012] As one of the preferred technical solutions, in this application, the seat plate shaft is provided with a bearing structure at the position where it passes through the dustproof end cover, and a bearing structure is provided between the inner wall of the dustproof end cover and the outer wall of the toothed plate.

[0013] As one of the preferred technical solutions, in this application, a rod sliding seat is also provided at the connection position between the base plate frame and the base plate. The rod sliding seat has a through hole that is slidably connected to the sliding rod, and rod traveling wheels are also provided inside the base plate frame.

[0014] As one of the preferred technical solutions, in this application, the sliding rods are distributed circumferentially on the steel pipe, and the two ends of the sliding rods are respectively connected to the sliding rod end plate and the sliding rod tail plate at corresponding positions. The sliding rod tail plate is fixed on the frame, and a support plate is provided at the bottom end of the sliding rod end plate. The support plate is located at the extension end of the support plate cylinder, and the support plate cylinder is fixed to the base.

[0015] As one of the preferred technical solutions, in this application, the steel pipe is placed and conveyed on the roller frame, the roller frame is provided with rollers that contact and support the steel pipe, the rollers are located at the bottom end and both sides of the steel pipe, and synchronous sprockets are provided on the rollers on both sides of the steel pipe, the synchronous sprockets are connected to the transmission chain; the roller frame is placed and fixed on the base.

[0016] Compared with the prior art, the beneficial effects of this application are:

[0017] This application utilizes various motion methods to adapt to the rust removal of the inner wall of 1200mm large-diameter steel pipes. By using a grinding wheel that rotates around its own central axis and several grinding wheels that rotate together around the central axis of the gear mounting plate, it is possible to effectively remove rust from the inner wall of large-diameter steel pipes and ensure the quality of removal.

[0018] This application sets up different walking modes along large-diameter steel pipes to adapt to different types of steel pipe processing, thereby improving the adaptability and flexibility of the device. Attached Figure Description

[0019] Figure 1 The overall three-dimensional structure of this application Figure 1 .

[0020] Figure 2 The overall three-dimensional structure of this application Figure 2 .

[0021] Figure 3 This is a three-dimensional view of the internal structure of this application.

[0022] Figure 4 It is linked with structures such as idler frame and idler rollers. Figure 1 .

[0023] Figure 5 It is linked with structures such as idler frame and idler rollers. Figure 2 .

[0024] Figure 6 This is a diagram showing the usage status when used in conjunction with structures such as idler frames and idlers.

[0025] In the diagram: 1. Roller frame; 2. Roller; 3. Synchronous sprocket; 4. Pallet cylinder; 5. Pallet; 6. Sliding rod end plate; 7. Sliding rod; 8. Grinding wheel; 9. Connecting seat; 10. Auxiliary seat; 11. Dustproof end cover; 12. Plate connecting rod; 13. Base plate; 14. Travel motor; 15. Inner wall travel wheel; 16. Rod sliding seat; 17. Grinding motor; 18. Rod travel wheel; 19. Gear plate; 20. Internal gear; 21. Planetary gear; 22. Gear mounting plate; 23. Base plate frame; 24. Steel pipe; 25. Sliding rod tail plate; 26. Seat plate shaft. Detailed Implementation

[0026] The technical solutions described in this application will be further described below with reference to the accompanying drawings and embodiments.

[0027] Example 1

[0028] like Figures 1 to 3 As shown, a rust removal device for the inner wall of a large-diameter steel pipe includes a base plate 13 composed of a circular plate. A grinding motor 17 is installed at the central axis of the base plate 13. Several plate connecting rods 12 are installed at the circumferential edge of the base plate 13. The base plate 13 is fixedly connected to a toothed plate 19 through the plate connecting rods 12. The toothed plate 19 is an annular plate. A gear mounting plate 22 is coaxially installed inside the toothed plate 19. A gap is left between the outer wall of the gear mounting plate 22 and the inner wall of the toothed plate 19 to ensure the movement of both. The gear mounting plate 22 is connected to the output shaft of the grinding motor 17. The inner wall of the gear plate 19 is also provided with internal teeth 20 in the direction away from the gear mounting plate 22. The gear plate 19 meshes with the planetary gear 21 through the internal teeth 20. The planetary gear 21 is fixedly mounted on the base plate shaft 26. The bottom end of the base plate shaft 26 is connected to the gear mounting plate 22 through a bearing structure. The top end of the base plate shaft 26 extends out after passing through the dustproof end cover 11 and is connected to the corresponding connecting seat 9 and auxiliary seat 10.

[0029] The dustproof end cap 11 has an opening at one end facing the gear plate 19 and is sealed at the other end away from the gear plate 19. The dustproof end cap 11 is connected to the outer wall of the gear plate 19 through a bearing structure provided on the inner wall, so that the dustproof end cap 11 can move together with the gear mounting plate 22, and at the same time, it can cooperate with the gear mounting plate 22 to achieve relative sealing of the internal space of the gear plate 19.

[0030] The dustproof end cap 11, toothed plate 19, gear mounting plate 22, and base plate 13 are coaxially arranged, and the outer diameter of the base plate 13 is less than or equal to the outer diameter of the dustproof end cap 11. The connecting seat 9 and auxiliary seat 10 are distributed circumferentially around the dustproof end cap 11 and are arranged alternately, that is, an auxiliary seat 10 is provided between adjacent connecting seats 9. A grinding wheel 8 is connected to the connecting seat 9 by fasteners, and the grinding wheel 8 contacts the circumferential inner wall of the steel pipe 24.

[0031] The base plate 13 has several base plate frames 23 distributed in the circumferential direction. A walking motor 14 is installed on the base plate frame 23. The walking motor 14 is connected to an inner wall walking wheel 15 through an output shaft. The inner wall walking wheel 15 is arranged on both sides of the base plate frame 23 and contacts the circumferential inner wall of the steel pipe 24.

[0032] Example 2

[0033] exist Figures 1 to 3 Based on the structure shown, see Figures 4 to 6 A rust removal device for the inner wall of a large-diameter steel pipe includes a rod sliding seat 16 mounted on a base plate frame 23, the rod sliding seat 16 being fixed integrally with the base plate 13. A through hole is machined on the rod sliding seat 16 for sliding along a sliding rod 7, and a linear bearing can be installed at the position where the through hole contacts the sliding rod 7. The base plate frame 23 is also equipped with rod traveling wheels 18 that contact and slide along the sliding rod 7.

[0034] The sliding rods 7 are evenly distributed around the central axis of the base plate 13. The two ends of the sliding rods 7 are respectively connected to the sliding rod end plate 6 and the sliding rod tail plate 25 at corresponding positions. The sliding rod tail plate 25 is connected to the frame by a fixing component. The bottom end of the sliding rod end plate 6 is provided with a support plate cylinder 4. The extension end of the support plate cylinder 4 is connected to a support plate 5. The support plate 5 contacts or disengages from the bottom end of the sliding rod end plate 6 under the action of the extension end of the support plate cylinder 4, so as to support the sliding rod end plate 6.

[0035] The pallet cylinder 4 is located on the base, and the base is also equipped with a roller frame 1. The roller frame 1 is equipped with rollers 2. The rollers 2 are distributed at the bottom end and both sides of the bottom end of the steel pipe 24. The rollers 2 on both sides of the bottom end are also connected to the synchronous sprockets 3 through the shaft. The synchronous sprockets 3 are connected through the transmission chain to realize the conveying of the steel pipe 24 on the roller frame 1 and the rollers 2.

[0036] The structure and connections of the remaining parts are the same as those described in Embodiment 1, and will not be repeated here to avoid redundancy. Those skilled in the art can understand and apply the technical solutions described in this embodiment based on the technical solutions described in Embodiment 1 and in conjunction with the structure and function of the various technical features given below.

[0037] Based on the above embodiments, the following paragraphs will continue to describe in detail the technical features involved and the functions and roles of these technical features in this technical solution, so as to help those skilled in the art to fully understand the technical solution and reproduce it.

[0038] In this application, the roller frame 1 is placed on the base and multiple sets can be set along the conveying direction of the steel pipe 24 to facilitate the conveying of the steel pipe 24 and to remove rust from its inner wall during the conveying process of the steel pipe 24, so as to facilitate subsequent anti-corrosion treatment.

[0039] In this application, the idler frame 1 is provided with idler rollers 2 for conveying steel pipe 24. The idler rollers 2 can be set at the bottom and both sides of the bottom of the steel pipe 24. The three idler rollers 2 can lift and stably convey the steel pipe 24. The idler rollers 2 on both sides of the bottom are provided with synchronous sprockets 3 connected coaxially. The synchronous sprockets 3 are connected to the conveying motor through synchronous chains to realize the synchronous rotation of the idler rollers 2, thereby realizing the stable conveying of the steel pipe 24.

[0040] In this application, the support plate cylinder 4 is mounted on a base and located below the sliding rod end plate 6. A support plate 5 is provided at the telescopic end of the support plate cylinder 4, and the support plate 5 has an end that contacts the sliding rod end plate 6. Under the telescopic action of the support plate cylinder 4, the support plate 5 can achieve contact and disengagement with the sliding rod end plate 6, thereby achieving support and temporary disengagement of the sliding rod end plate 6.

[0041] In this application, the sliding rod end plate 6 is located at one end of the sliding rod 7, and the other end of the sliding rod 7 is located on the sliding rod tail plate 25, which is connected to the frame. See the appendix of this application. Figures 4 to 6 The sliding rods 7 are evenly distributed along the central axis of the steel pipe 24 and can enter the interior of the steel pipe 24 during the conveying process. The sliding rods 7 described in this application are used to guide and support the base plate 13, enabling the base plate 13 to move along the sliding rods 7.

[0042] In this application, the base plate 13 is provided with a rod sliding seat 16 in the circumferential direction. The rod sliding seat 16 is integral with the base plate frame 23. The base plate frame 23 is provided with rod traveling wheels 18 that can move along the sliding rod 7. The rod sliding seat 16 is provided with a through hole for the sliding rod 7 to pass through. A linear bearing is provided at the connection position between the rod sliding seat 16 and the sliding rod 7. The above structure can realize the sliding connection between the base plate 13 and the sliding rod 7, ensuring that the base plate 13 moves along the direction of the sliding rod 7 and is supported by the sliding rod 7.

[0043] In this application, the rod walking wheel 18 can be configured to be driven by the walking motor 14, and under the drive of the walking motor 14, it can cause the base plate frame 23 and the base plate 13 to move together as it moves along the sliding rod 7.

[0044] In this application, the base plate frame 23 is further provided with pairs of inner wall traveling wheels 15 on both sides. These inner wall traveling wheels 15 can contact the inner wall of the steel pipe 24 when entering the steel pipe 24, thus supporting the base plate 13 and ensuring stable movement of the base plate 13 inside the steel pipe 24. In this application, the inner wall traveling wheels 15 are driven by a traveling motor 14. The end of the traveling motor 14 may be provided with a gear reduction structure. The gear reduction structure has an input end connected to the output shaft of the traveling motor 14, an output end connected to at least the inner wall traveling wheels 15, and an output end that can be connected to the rod traveling wheels 18.

[0045] In this application, the base plate 13 is a circular plate. A grinding motor 17 is installed at the central axis of the base plate 13. The output shaft of the grinding motor 17 passes through the base plate 13, extends out, and connects to the gear mounting plate 22. Several plate connecting rods 12 are provided at the circumferential edge of the base plate 13. The plate connecting rods 12 are perpendicular to the base plate 13, and the base plate 13 is fixedly connected to the gear plate 19 through the plate connecting rods 12. The gear plate 19 is an annular plate, and the gear mounting plate 22 is a circular plate. The gear mounting plate 22 is located inside the gear plate 19, and a gap that does not affect the movement is left between the outer wall of the gear mounting plate 22 and the inner wall of the gear plate 19.

[0046] The gear plate 19 has internal teeth 20 machined on its inner wall away from the gear mounting plate 22. The gear plate 19 meshes with a plurality of planetary gears 21 through the internal teeth 20. The planetary gears 21 are evenly distributed around the circumference of the gear plate 19 and are rotatably connected to the gear mounting plate 22 through the base plate shaft 26. A bearing structure is provided at the connection position between the base plate shaft 26 and the gear mounting plate 22 to ensure the stability of rotation around its own axis.

[0047] In this application, the seat plate shaft 26 extends from the dustproof end cover 11, and a connecting seat 9 or an auxiliary seat 10 is provided at the end extending from the dustproof end cover 11. The dustproof end cover 11 is a cover with an open bottom and a sealed top. A bearing structure is provided between the inner wall of the opening of the dustproof end cover 11 and the outer wall of the toothed plate 19 to ensure the stability of both during rotation around their respective central axes.

[0048] In this application, the seat plate shaft 26 is provided with a bearing structure at the position where it passes through the dustproof end cover 11, so as to further assist the rotational stability of the seat plate shaft 26.

[0049] In this application, the connecting seat 9 and the auxiliary seat 10 are alternately arranged, as shown in the following figure. Figures 1 to 3 An auxiliary seat 10 is provided between adjacent connecting seats 9. The auxiliary seat 10 is used for backup. The connecting seat 9 is connected to a grinding wheel 8 by fasteners. The grinding position of the grinding wheel 8 extends beyond the outer wall of the dustproof end cover 11. The grinding wheel 8 is a grinding wheel or a wire brush.

[0050] The outer diameter of the dustproof end cap 11 is greater than the outer diameter of the toothed plate 19, and the outer diameter of the base plate 13 is less than or equal to the outer diameter of the dustproof end cap 11.

[0051] In use, this application can be used independently of the sliding rod 7. Specifically, the inner wall traveling wheels 15 on the base plate frame 23 are used to support the base plate 13, and several grinding wheels 8 at the front are used for support to achieve autonomous movement inside the steel pipe 24. However, the walking efficiency and stability are not as good as using the sliding rod 7. Therefore, this application recommends using the sliding rod 7 and the roller frame 1 in combination to clean the inside of the steel pipe 24. Specifically, when the steel pipe 24 is conveyed to the position of the sliding rod 7 by the roller frame 1 and the roller 2 under the action of the synchronous chain connected to the synchronous sprocket 3, specifically, when the steel pipe 24 is conveyed to the position of the pallet cylinder 4, after the induction switch senses the position of the steel pipe 24, the pallet cylinder 4 starts to work. The extension end of the pallet cylinder 4 drives the connected pallet 5 to move downward, and the pallet 5 temporarily disengages from the upper sliding rod end plate 6. After the pallet cylinder 4 completes its operation, the synchronous sprocket 3 continues to drive the idler roller 2, causing the steel pipe 24 to continue moving along the idler roller frame 1 until the sliding rod 7 enters the interior of the steel pipe 24 and the sliding rod end plate 6 extends out from the interior of the steel pipe 24. When the sliding rod end plate 6 extends out from the interior of the steel pipe 24, the inductive switch senses the sliding rod end plate 6, and the pallet cylinder 4 starts to work. The telescopic end of the pallet cylinder 4 extends, causing the pallet 5 to contact the sliding rod end plate 6 and support the sliding rod end plate 6.

[0052] At this point, sufficient sliding rod 7 is left between the end plate 25 of the sliding rod and the end of the steel pipe 24 to provide enough storage space for the grinding wheel 8, dustproof end cap 11, base plate 13, etc. First, start the grinding motor 17 to drive the grinding wheel 8 to rotate. When the travel motor 14 can drive the rod travel wheel 18 to rotate, the rod travel wheel 18 can drive the base plate 13 to move the entire structure along the sliding rod 7. When the travel motor 14 cannot drive the rod travel wheel 18 to move, manually push it into the inside of the steel pipe 24. During the pushing process, the rod travel wheel 18 moves along the sliding rod 7. After the inner wall travel wheel 15, the grinding wheel 8 and the inner wall of the steel pipe 24 are in contact, start the travel motor 14 again. The travel motor 14 drives the inner wall travel wheel 15 to move, and the inner wall travel wheel 15 drives the entire structure to move along the inner wall of the steel pipe 24.

[0053] After the grinding wheel 8 extends from the other end of the steel pipe 24, the travel motor 14 drives the inner wall travel wheel 15 to move in the opposite direction, thereby causing the entire device to move in the direction of the sliding rod tail plate 25. The grinding wheel 8 performs a secondary cleaning of the inner wall of the steel pipe 24. After cleaning, when the travel motor 14 can drive the rod travel wheel 18 to rotate, the entire device can automatically reset to the initial position. When the travel motor 14 does not drive the rod travel wheel 18 to move, the entire device needs to be manually moved to the initial position.

[0054] After the above-mentioned secondary cleaning is completed and the device is reset, the synchronous sprocket 3 drives the idler roller 2 to rotate in the opposite direction through the synchronous chain, and the steel pipe 24 is conveyed in the opposite direction. After the steel pipe 24 moves to the position of the sliding rod end plate 6, the pallet cylinder 4 drives the pallet 5 to separate from the sliding rod end plate 6. The steel pipe 24 continues to move until the sliding rod end plate 6 is exposed from the steel pipe 24 again and is sensed by the induction switch. Then the pallet cylinder 4 starts to work, and the pallet 5 at the extension end of the pallet cylinder 4 contacts the sliding rod end plate 6 again.

[0055] In this application, the inductive switches are proximity switches, respectively installed on both sides of the pallet cylinder 4, to sense the movement position of the steel pipe 24 and feed back the sensed signal to the hydraulic pump station connected to the pallet cylinder 4 through the hydraulic pipeline, so as to control the start, stop and reset of the pallet cylinder 4. In this application, the walking motor 14 and the grinding motor 17 used in the above-mentioned working process can be manually started by their respective switches.

[0056] Finally, although this specification describes embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A rust removal device for the inner wall of a large-diameter steel pipe, comprising a grinding wheel (8), the grinding wheel (8) contacting the inner wall of the steel pipe (24) and being mounted on a connecting seat (9), the connecting seat (9) being located on a seat plate shaft (26), characterized in that: The seat plate shaft (26) passes through the dustproof end cover (11) and is rotatably connected to the gear mounting plate (22). The gear mounting plate (22) is located inside the gear plate (19) and is coaxially arranged with the gear plate (19). The gear plate (19) meshes with the planetary gear (21) through the internal teeth (20) provided on the inner wall. The planetary gear (21) is fixed on the seat plate shaft (26) and located in the space formed by the gear plate (19). The dustproof end cover (11) is located on the side of the gear plate (19) away from the gear mounting plate (22) and is coaxially arranged with the gear plate (19). 9) The outer wall is rotatably connected. The toothed plate (19) is connected to the base plate (13) through the plate connecting rod (12). The outer diameter of the base plate (13) is less than or equal to the outer diameter of the toothed plate (19). A grinding motor (17) is provided on the base plate (13). The output shaft of the grinding motor (17) is connected to the gear mounting plate (22). A base plate frame (23) is also provided on the base plate (13). A walking motor (14) is provided on the base plate frame (23). The output shaft of the walking motor (14) is connected to the inner wall walking wheel (15).

2. The rust removal device for the inner wall of a large-diameter steel pipe according to claim 1, characterized in that: An auxiliary seat (10) is also provided between adjacent connecting seats (9). The auxiliary seat (10) is located outside the dustproof end cover (11) and is flush with the connecting seat (9). The auxiliary seat (10) is connected to one end of the corresponding seat plate shaft (26). The other end of the seat plate shaft (26) passes through the dustproof end cover (11) and is rotatably connected to the gear mounting plate (22).

3. The rust removal device for the inner wall of a large-diameter steel pipe according to claim 1, characterized in that: The toothed plate (19) is an annular plate, and the inner teeth (20) are located on the inner wall of the toothed plate (19). There is a gap between the outer wall of the gear mounting plate (22) and the inner wall of the toothed plate (19). The output shaft of the grinding motor (17) is coaxial with the central axis of the gear mounting plate (22).

4. The rust removal device for the inner wall of a large-diameter steel pipe according to claim 3, characterized in that: The seat plate shaft (26) is provided with a bearing structure at the position where it passes through the dustproof end cover (11), and a bearing structure is provided between the inner wall of the dustproof end cover (11) and the outer wall of the toothed plate (19).

5. The rust removal device for the inner wall of a large-diameter steel pipe according to claim 4, characterized in that: A rod sliding seat (16) is also provided at the connection position between the base plate frame (23) and the base plate (13). The rod sliding seat (16) has a through hole that is slidably connected to the sliding rod (7). A rod traveling wheel (18) is also provided inside the base plate frame (23).

6. The rust removal device for the inner wall of a large-diameter steel pipe according to claim 5, characterized in that: The sliding rod (7) is distributed around the steel pipe (24). The two ends of the sliding rod (7) are connected to the sliding rod end plate (6) and the sliding rod tail plate (25) at the corresponding positions, respectively. The sliding rod tail plate (25) is fixed on the frame. The bottom end of the sliding rod end plate (6) is provided with a support plate (5). The support plate (5) is located at the telescopic end of the support plate cylinder (4). The support plate cylinder (4) is fixed to the base.

7. A rust removal device for the inner wall of a large-diameter steel pipe according to claim 6, characterized in that: The steel pipe (24) is placed and conveyed on the roller frame (1). The roller frame (1) is provided with rollers (2) that contact and support the steel pipe (24). The rollers (2) are located at the bottom and both sides of the steel pipe (24). Synchronous sprockets (3) are provided on the rollers (2) on both sides of the steel pipe (24). The synchronous sprockets (3) are connected to the transmission chain. The roller frame (1) is placed and fixed on the base.

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