An on-line repair device for pipeline coating in a condensation environment

Abstract

The utility model discloses a kind of pipeline coating online repair devices for condensation environment, including sleeve, airflow purging mechanism and sliding support mechanism;The sleeve is used to be sleeved in the outer of the pipeline to be repaired, and the gas outlet and the outer circumferential wall of the pipeline to be repaired are mutually separated to form gas gap;The airflow purging mechanism includes first blowing unit and second blowing unit;The multiple first air jets of the first blowing unit are all aligned with the gas outlet;The multiple second air jets of the second blowing unit are all used to align the pipeline to be repaired;The sliding support mechanism is arranged on the inner wall of sleeve, and sliding support mechanism is used to be rolled with the pipeline to be repaired and abuts, to realize the movement of pipeline coating online repair device on the pipeline to be repaired;After adopting this scheme, liquid water can be quickly removed in coating repair construction process, local stable dew control space is formed, and construction auxiliary device supporting online coating operation is realized, to improve repair efficiency, coating quality and on-site adaptability.

Description

Technical Field

[0001] This utility model relates to the technical field of pipeline anti-corrosion construction, and in particular to an online repair device for pipeline coatings in condensation environments. Background Technology

[0002] During service, natural gas pipelines often experience surface temperatures lower than ambient temperatures due to the volume expansion of transported materials, whether underwater or underground. When the surface temperature falls below the ambient dew point, condensation easily forms on the pipeline surface, a phenomenon commonly known as "sweating." Current coating repair procedures typically include high-pressure water jet rust removal, interface drying, and coating application. After rust removal, liquid water often remains on the pipeline surface. Even after interface drying methods such as wiping, condensation quickly re-forms on the exposed metal surface in condensation environments. This damp interface directly affects the coating application quality, specifically manifesting as follows:

[0003] 1. Decreased adhesion: Liquid water or condensation forming a water film can hinder sufficient contact between the coating and the metal substrate, resulting in a significant decrease in coating adhesion.

[0004] 2. Formation of coating bubbles and bulges: As moisture evaporates during the coating curing process, it forms bubbles inside the coating, causing localized bulges or hollow areas.

[0005] 3. Local peeling or detachment: Poor adhesion and concentrated bubbles may cause local peeling of the coating, forming weak areas for corrosion protection.

[0006] Therefore, to ensure coating quality, construction workers may need to stop work to wait for the surface to dry or redo the coating, thus reducing construction efficiency and increasing maintenance costs. To remove residual moisture from the surface, blowers, hot air blowers, or temporary tents are usually used on-site to assist drying; however, these methods have the following drawbacks:

[0007] 1. Drying efficiency is greatly affected by ambient temperature and humidity, especially in high humidity or low temperature environments where it is difficult to quickly reach the coating conditions.

[0008] 2. It cannot effectively control airflow and moisture environment, and condensation film can easily reform in a short time;

[0009] 3. The equipment is large in size and inconvenient to move, making it difficult to meet the online operation requirements for partial pipeline repair.

[0010] Therefore, there is an urgent need for a construction auxiliary device that can quickly remove liquid water, create a localized stable exposure control space, and support online coating operations during the coating repair process, so as to improve repair efficiency, coating quality, and on-site adaptability. Utility Model Content

[0011] The purpose of this invention is to provide an online pipeline coating repair device for condensation environments. This device can quickly remove liquid water, create a localized stable condensation control space, and support online coating operations during the coating repair process, thereby improving repair efficiency, coating quality, and on-site adaptability.

[0012] To address the aforementioned technical problems, this utility model provides an online pipe coating repair device for condensation environments, comprising a sleeve, an airflow purging mechanism, and a sliding support mechanism. The sleeve is fitted over the pipe to be repaired, with one end of the sleeve serving as an air outlet. The diameter of the air outlet is smaller than the inner diameter of the sleeve, and the air outlet is separated from the outer peripheral wall of the pipe to be repaired, forming an air outlet gap. The airflow purging mechanism includes a first spray unit and a second spray unit. The first spray unit is located between the air outlet and the second spray unit, with multiple first air nozzles of the first spray unit arranged circumferentially separated along the inner peripheral wall of the sleeve, all aligned with the air outlet. Similarly, multiple second air nozzles of the second spray unit are arranged circumferentially separated along the inner peripheral wall of the sleeve, all aligned with the pipe to be repaired. The sliding support mechanism is located on the inner wall of the sleeve and is used to roll against the pipe to be repaired, thereby enabling the online pipe coating repair device to move on the pipe.

[0013] In one embodiment, the first blowing unit is used to perform intermittent blowing operations on the air outlet; the second blowing unit is used to perform continuous blowing operations on the pipeline to be repaired.

[0014] In one embodiment, the sleeve includes two semi-circular half-tube shells, which are detachably spliced ​​and fixed together. Both half-tube shells are provided with the airflow purging mechanism and the sliding support mechanism.

[0015] In one embodiment, the first blowing unit includes a first air supply control valve, a first blowing pipe, and an extension pipe; the first air supply control valve is disposed on the outer wall of the semi-tube shell and is connected to the first blowing pipe, and is used to control the air jet state of the first blowing unit; the first blowing pipe extends along the inner circumferential wall of the semi-tube shell in an arc shape; multiple extension pipes extend between the first blowing pipe and the air outlet, one end of each extension pipe is connected to the first blowing pipe, and the other end of each extension pipe is the first air jet outlet, and the multiple first air jet outlets are arranged circumferentially separated along the air outlet.

[0016] In one embodiment, the second jetting unit includes a second air supply control valve and a second jetting pipe; the second air supply control valve is disposed on the outer wall of the semi-tube shell and is connected to the second jetting pipe, and the second air supply control valve is used to control the jetting state of the second jetting unit; the second jetting pipe extends along the inner peripheral wall of the semi-tube shell in an arc shape, and a plurality of second jetting ports are separately arranged along the arrangement trajectory of the second jetting pipe.

[0017] In one embodiment, multiple second jet pipes are arranged separately along the axial direction of the sleeve, and the multiple second jet pipes are connected in series, with one of the second jet pipes connected to the second air supply control valve.

[0018] In one embodiment, the sliding support mechanism includes angle-adjustable support feet and rollers; a plurality of angle-adjustable support feet are respectively disposed at various locations on the inner wall of the sleeve, and each of the plurality of angle-adjustable support feet is equipped with a rotatable roller, the angle-adjustable support feet being used to adjust the position of the rollers so that the rollers roll and abut against the pipes to be repaired of different sizes.

[0019] In one embodiment, the angle-adjustable support foot includes a first support rod, a second support rod, a third support rod, a connecting rod, and a positioning nut; one end of the first support rod is fixedly connected to the inner wall of the sleeve, and the other end of the first support rod is connected to one end of the second support rod to form an angle-lockable first rotary joint; the other end of the second support rod is provided with a guide hole, the axis of which is perpendicular to the rotation axis of the first rotary joint; one end of the third support rod is rotatably connected to the middle of the first support rod to form a second rotary joint, the rotation axis of which is consistent with the rotation axis of the first rotary joint; the other end of the third support rod is rotatably mounted with the roller; one end of the connecting rod is rotatably connected to the body of the third support rod to form a third rotary joint, the rotation axis of which is consistent with the rotation axis of the first rotary joint; the other end of the connecting rod is provided with an external thread and threadedly connected to the positioning nut through the guide hole.

[0020] In one embodiment, the roller is made of elastic soft rubber.

[0021] The beneficial effects of this utility model are as follows:

[0022] The first spray unit of this invention can be controlled by a step-by-step mechanism, which can be started and stopped flexibly according to the working conditions, reducing energy waste. The second spray unit can be carried out continuously with the coating operation, maintaining positive pressure and dryness in the cavity and preventing redeposition of condensation at the interface. Moreover, in conjunction with the sliding support mechanism, the device can be smoothly advanced and precisely positioned.

[0023] Therefore, this invention can provide a clean and dry construction interface for moisture-curing coatings, significantly improve coating adhesion and density, ensure the quality of anti-corrosion repair and long-term service reliability, and achieve efficient synergy of rust removal, water removal, drying and coating of pipeline surfaces. Attached Figure Description

[0024] To more clearly illustrate the technical solution of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0025] Figure 1 This is a structural schematic diagram provided by an embodiment of the present utility model. Figure 1 ;

[0026] Figure 2 This is a structural schematic diagram provided by an embodiment of the present utility model. Figure 2 ;

[0027] Figure 3 yes Figure 1 A schematic diagram of the disassembled structure;

[0028] Figure 4 yes Figure 3 An enlarged structural diagram of the sliding support mechanism.

[0029] The attached figures are labeled as follows:

[0030] 100. Sleeve; 110. Air outlet; 120. Air outlet gap; 130. Frustum-shaped cylindrical section; 140. Half-shell; 150. Snap-fit;

[0031] 200. Airflow purging mechanism; 210. First jet unit; 211. First jet nozzle; 212. First air supply control valve; 213. First jet pipe; 214. Extension pipe; 220. Second jet unit; 221. Second jet nozzle; 222. Second air supply control valve; 223. Second jet pipe;

[0032] 300. Sliding support mechanism; 310. Angle-adjustable support foot; 311. First support rod; 312. Second support rod; 313. Third support rod; 314. Connecting rod; 315. Positioning nut; 316. First rotating joint; 317. Second rotating joint; 318. Third rotating joint; 319. Guide hole; 320. Roller;

[0033] 400. Pipeline to be repaired. Detailed Implementation

[0034] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0035] This utility model provides an online repair device for pipe coatings in condensation environments, the implementation of which is as follows: Figure 1 and Figure 2 As shown, it includes a sleeve 100, an airflow purging mechanism 200, and a sliding support mechanism 300.

[0036] Regarding the sleeve 100, as Figure 1 As shown, in this embodiment, the sleeve 100 is used to fit over the pipe 400 to be repaired, and one end of the sleeve 100 is an air outlet 110. The diameter of the air outlet 110 is smaller than the inner diameter of the sleeve 100. The air outlet 110 is separated from the outer peripheral wall of the pipe 400 to be repaired to form an air outlet gap 120. The air outlet gap 120 can be set large enough to meet the application requirements of pipes 400 to be repaired of different sizes.

[0037] For example, in Figure 1 In the direction shown, the air outlet 110 is located at the left end of the sleeve 100. In order to form the air outlet 110, this embodiment forms a frustum-shaped cylindrical section 130 at one end of the sleeve 100. The large diameter end of the frustum-shaped cylindrical section 130 is consistent with the inner diameter of the sleeve 100, and the narrow diameter end of the frustum-shaped cylindrical section 130 can serve as the air outlet 110.

[0038] In order to facilitate assembly and future maintenance and adjustment, such as Figures 1 to 3 As shown, in this embodiment, the sleeve 100 includes two semi-circular semi-tube shells 140. The two semi-tube shells 140 are connected by a detachable splicing and fixing structure. Each of the two semi-tube shells 140 is provided with an airflow purging mechanism 200 and a sliding support mechanism 300.

[0039] For example from Figure 1 and Figure 3 As shown, the two half-pipe shells 140 can be respectively set above and below the pipe 400 to be repaired. Both are equipped with clips 150, so the two half-pipe shells 140 can be quickly installed and disassembled by operating the clips 150. Of course, the splicing and fixing structure of the two half-pipe shells 140 is not limited to clips 150. Similar bolt and nut fixing, clamp fixing, etc. are all optional methods.

[0040] Regarding the airflow purging mechanism 200, as Figure 1 and Figure 3 As shown, in this embodiment, the airflow purging mechanism 200 includes a first purging unit 210 and a second purging unit 220.

[0041] from Figure 1 and Figure 3 It can be seen that the first jet unit 210 is located between the air outlet 110 and the second jet unit 220. The multiple first jet nozzles 211 of the first jet unit 210 are arranged circumferentially along the inner peripheral wall of the sleeve 100, and the multiple first jet nozzles 211 are all aligned with the air outlet 110.

[0042] Specifically, such as Figure 1 and Figure 3 As shown, the first blowing unit 210 includes a first air supply control valve 212, a first blowing pipe 213, and an extension pipe 214. The first air supply control valve 212 is located on the outer wall of the semi-tube shell 140 and is connected to the first blowing pipe 213. The first air supply control valve 212 is used to control the blowing state of the first blowing unit 210, such as whether to blow air, the amount of air blown, and the duration of air blown. The first blowing pipe 213 extends along the inner circumferential wall of the semi-tube shell 140 in an arc shape. Multiple extension pipes 214 extend between the first blowing pipe 213 and the air outlet 110. One end of each extension pipe 214 is connected to the first blowing pipe 213, and the other end of each extension pipe 214 is a first air outlet 211. Multiple first air outlets 211 are arranged circumferentially separated along the air outlet 110.

[0043] And from Figure 1 and Figure 3 It can be seen that the multiple second jet nozzles 221 of the second jet unit 220 are arranged circumferentially along the inner peripheral wall of the sleeve 100, and the multiple second jet nozzles 221 are all used to align with the pipe 400 to be repaired.

[0044] Specifically, such as Figure 3 As shown, the second jetting unit 220 includes a second air supply control valve 222 and a second jetting pipe 223. The second air supply control valve 222 is located on the outer wall of the semi-tube shell 140 and is connected to the second jetting pipe 223. The second air supply control valve 222 is used to control the jetting state of the second jetting unit 220, such as whether to jet, the amount of jetting, and the duration of jetting. The second jetting pipe 223 extends along the inner peripheral wall of the semi-tube shell 140 in an arc shape, and multiple second jetting ports 221 are arranged separately along the arrangement trajectory of the second jetting pipe 223.

[0045] Furthermore, to increase the drying range of the second blowing unit 220, it is also possible to set up multiple second blowing pipes 223 separately arranged along the axial direction of the sleeve 100, and connect multiple second blowing pipes 223 in series. At this time, it is only necessary to connect one of the second blowing pipes 223 to the second air supply control valve 222.

[0046] For example from Figure 3As can be seen, this embodiment is provided with two second jet pipes 223, which are parallel and separate relative to each other, and are connected by a straight pipe.

[0047] It should be noted that, in order to balance drying efficiency and energy consumption, this embodiment also includes a first blowing unit 210 for intermittent blowing operation on the air outlet 110, and a second blowing unit 220 for continuous blowing operation on the pipe 400 to be repaired.

[0048] At this time, the first spray unit 210 can be controlled by stepping, and can be started and stopped flexibly according to the working conditions to reduce energy waste. The second spray unit 220 can be carried out continuously with the coating operation to maintain positive pressure and dryness in the cavity and prevent interface re-condensation. The specific control effect can be achieved by controlling the opening and closing state of the first air supply control valve 212 and the second air supply control valve 222.

[0049] Regarding the sliding support mechanism 300, as Figure 1 As shown, in this embodiment, the sliding support mechanism 300 is set on the inner wall of the sleeve 100. The sliding support mechanism 300 is used to roll and abut against the pipe 400 to be repaired, so as to realize the movement of the online pipe coating repair device on the pipe 400 to be repaired.

[0050] In order to enable movement on pipes 400 of different sizes to be repaired, such as Figure 1 and Figure 3 As shown, in this embodiment, the sliding support mechanism 300 includes an angle-adjustable support foot 310 and a roller 320. Multiple angle-adjustable support feet 310 are respectively located on the inner wall of the sleeve 100, and each angle-adjustable support foot 310 is equipped with a rotatable roller 320. The angle-adjustable support feet 310 are used to adjust the position of the roller 320 so that the roller 320 rolls and abuts against the pipe 400 of different sizes to be repaired.

[0051] The specific structure of the angle-adjustable support foot 310 can be found in [reference needed]. Figure 3 and Figure 4 As shown in the configuration, the angle-adjustable support foot 310 includes a first support rod 311, a second support rod 312, a third support rod 313, a connecting rod 314, and a positioning nut 315.

[0052] One end of the first support rod 311 is fixedly connected to the inner wall of the sleeve 100, and the other end of the first support rod 311 is connected to one end of the second support rod 312 to form a first rotating joint 316 with an angle lockable. For example, a bolt can be used as the rotating shaft of the first rotating joint 316, and a corresponding nut is threaded onto the bolt. Therefore, by tightening the nut, the current position of the first rotating joint 316 can be locked, and by loosening the nut, the angle of the first rotating joint 316 can be adjusted.

[0053] The other end of the second support rod 312 is provided with a guide hole 319, and the axial direction of the guide hole 319 is perpendicular to the rotation axis of the first rotating joint 316.

[0054] One end of the third support rod 313 is rotatably connected to the middle of the first support rod 311 to form a second rotating joint 317. The rotation axis of the second rotating joint 317 is consistent with the rotation axis of the first rotating joint 316. A roller 320 is rotatably mounted on the other end of the third support rod 313.

[0055] One end of the connecting rod 314 is rotatably connected to the body of the third support rod 313 to form a third rotating joint 318. The rotation axis of the third rotating joint 318 is consistent with the rotation axis of the first rotating joint 316. The other end of the connecting rod 314 is provided with an external thread and is threaded to a positioning nut 315 through a guide hole 319. Therefore, by turning the positioning nut 315, the length of the connecting rod 314 passing through the guide hole 319 can be adjusted, thereby realizing the relative position adjustment between the third support rod 313 and the first support rod 311, and between the third support rod 313 and the second support rod 312.

[0056] After adopting the above setting method, by adjusting the rotation angle of the first rotating joint 316 and the length of the connecting rod 314 passing through the guide hole 319, the setting position of the roller 320 can be adjusted, so that the roller 320 can roll and connect with the pipe 400 of different sizes to be repaired.

[0057] Furthermore, it is also possible to consider making the roller 320 into a flexible soft rubber material so that the roller 320 can form an elastic contact with the pipe 400 to be repaired, thereby further increasing the tightness of the fit between the two.

[0058] The specific construction steps for the above-described implementation method are roughly as follows:

[0059] (1) Surface pretreatment

[0060] High-pressure water jet equipment is used to remove rust from the outer surface of the pipe 400 to be repaired. The water jet pressure is selected in the range of 80 to 150 MPa according to the degree of rust. High-pressure water rust removal can effectively remove oxide scale, rust products and loose attachments from the surface of the pipe 400 to be repaired, achieving the specified cleanliness level. After the rust removal operation is completed, a large amount of liquid water will remain on the surface of the pipe 400 to be repaired, and it will be in a high humidity environment. The exposed steel surface is prone to recondensation in a short time.

[0061] (2) Device positioning and start-up

[0062] The online pipe coating repair device of this embodiment is fitted onto the pipe 400 section to be repaired that has been derusted by high-pressure water. The support angle is adjusted by the sliding support mechanism 300 so that the online pipe coating repair device can be stably fixed and can slide freely along the axis of the pipe 400 to be repaired. Then, the compressed air pipeline can be connected by the airflow purging mechanism 200 and the airflow purging mechanism 200 can be turned on to start working.

[0063] (3) Function of the first jetting unit 210

[0064] The first blowing unit 210 is started and stopped via the first air supply control valve 212. When the online pipeline coating repair device advances axially along the pipeline 400 to be repaired to the designated position, the first blowing unit 210 is turned on, and compressed air is injected at high speed. A strong impact airflow is formed through the annular air outlet gap 120 between the air outlet 110 and the pipeline 400 to be repaired, which concentrates and blows away liquid water and impurities on the surface. After the blowing is completed, the first air supply control valve 212 is closed, and the online pipeline coating repair device moves forward to the next working section. This step-by-step operation can achieve efficient water removal and reduce the energy consumption caused by continuous blowing.

[0065] (4) Function of the second jet unit 220

[0066] After the first blowing unit 210 completes the liquid water purging, the second blowing unit 220 arranged inside the sleeve 100 cavity is continuously opened through the second air supply control valve 222 to introduce low-flow dry compressed air, further drying the residual moisture on the surface of the pipe 400 to be repaired, and forming a stable positive pressure zone inside the sleeve 100; this positive pressure airflow can effectively block the entry of external humid air, thereby maintaining a dry and clean construction interface for a longer period of time.

[0067] (5) Coating application

[0068] In the controlled-dew environment created by the continuous operation of the second purging unit 220, the construction personnel use a brushing tool to directly apply coating to the completely dry surface of the pipe 400 to be repaired, which is maintained by a dry airflow, in the parallel port area at the rear end of the sleeve 100 body. The coating used is a moisture-curing anti-corrosion coating, such as a moisture-curing polyurethane product, which has high requirements for the cleanliness and dryness of the substrate surface. This online pipe coating repair device ensures that the coating is applied on a non-condensing interface through continuous purging and a positive pressure controlled-dew environment, avoiding problems such as pinholes, bulges, and insufficient adhesion of the coating.

[0069] (6) Promote graded and mixed operations

[0070] The entire "blowing-drying-maintenance-coating" process is implemented in a graded, mixed manner. The first blasting unit 210 starts intermittently in a step-by-step manner to complete the staged dehydration; the second blasting unit 220 operates continuously with the coating application, maintaining a stable positive pressure drying environment as the online pipeline coating repair device moves smoothly forward; the construction personnel follow the movement rhythm of the online pipeline coating repair device to continuously brush the coating, achieving the coordinated advancement of drying, dew control, and coating, forming a stable and efficient repair process.

[0071] (7) Subsequent curing and inspection

[0072] Moisture-curing coatings cure directly in the service environment after application, without requiring additional artificial drying. Once cured, visual inspection and adhesion testing confirm the coating surface is intact and meets design requirements.

[0073] The above description is the preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications are also considered to be within the protection scope of this utility model.

Claims

1. An online repair device for pipe coatings in condensation environments, characterized in that, Includes a sleeve, an airflow purging mechanism, and a sliding support mechanism; The sleeve is used to fit over the pipe to be repaired, and one end of the sleeve is an air outlet. The diameter of the air outlet is smaller than the inner diameter of the sleeve, and the air outlet is separated from the outer peripheral wall of the pipe to be repaired to form an air outlet gap. The airflow purging mechanism includes a first jetting unit and a second jetting unit; The first jet unit is located between the air outlet and the second jet unit. The plurality of first jet nozzles of the first jet unit are arranged circumferentially separated along the inner peripheral wall of the sleeve, and the plurality of first jet nozzles are all aligned with the air outlet. The second jet unit has multiple second jet nozzles arranged circumferentially along the inner circumferential wall of the sleeve, and each of the multiple second jet nozzles is used to align with the pipe to be repaired. The sliding support mechanism is disposed on the inner wall of the sleeve, and the sliding support mechanism is used to roll and abut against the pipe to be repaired so as to realize the movement of the online pipe coating repair device on the pipe to be repaired; The first jetting unit is used to perform intermittent jetting operation on the air outlet; The second blowing unit is used to perform continuous blowing operations on the pipeline to be repaired.

2. The online pipe coating repair device according to claim 1, characterized in that, The sleeve includes two semi-circular half-tube shells, which are detachably spliced ​​and fixed together. Both half-tube shells are provided with the airflow purging mechanism and the sliding support mechanism.

3. The online pipeline coating repair device according to claim 2, characterized in that, The first blowing unit includes a first air supply control valve, a first blowing pipe, and an extension pipe; The first air supply control valve is located on the outer wall of the semi-tube shell. The first air supply control valve is connected to the first jet pipe. The first air supply control valve is used to control the jet state of the first jet unit. The first jet pipe extends along the inner peripheral wall of the semi-tube shell in an arc shape; Multiple extension pipes are arranged between the first jet pipe and the air outlet. One end of each extension pipe is connected to the first jet pipe, and the other end of each extension pipe is the first jet outlet. Multiple first jet outlets are arranged circumferentially separated along the air outlet.

4. The online pipe coating repair device according to claim 2, characterized in that, The second jetting unit includes a second air supply control valve and a second jetting pipe; The second air supply control valve is located on the outer wall of the semi-tube shell. The second air supply control valve is connected to the second jet pipe. The second air supply control valve is used to control the jet state of the second jet unit. The second jet pipe extends along the inner circumferential wall of the semi-tube shell in an arc shape, and a plurality of second jet nozzles are arranged separately along the arrangement trajectory of the second jet pipe.

5. The online pipe coating repair device according to claim 4, characterized in that, Multiple second jet pipes are arranged separately along the axial direction of the sleeve, and the multiple second jet pipes are connected in series. One of the second jet pipes is connected to the second air supply control valve.

6. The online pipe coating repair device according to any one of claims 1 or 2, characterized in that, The sliding support mechanism includes angle-adjustable support feet and rollers; Multiple angle-adjustable support feet are respectively located on the inner wall of the sleeve, and each of the multiple angle-adjustable support feet is equipped with a rotatable roller. The angle-adjustable support feet are used to adjust the position of the roller so that the roller rolls and abuts against the pipe to be repaired of different sizes.

7. The online pipeline coating repair device according to claim 6, characterized in that, The angle-adjustable support foot includes a first support rod, a second support rod, a third support rod, a connecting rod, and a positioning nut; One end of the first support rod is fixedly connected to the inner wall of the sleeve, and the other end of the first support rod is connected to one end of the second support rod to form a first rotating joint with an angle lockable. The other end of the second support rod is provided with a guide hole, and the axis of the guide hole is perpendicular to the rotation axis of the first rotating joint; One end of the third support rod is rotatably connected to the middle of the first support rod to form a second rotating joint, and the rotation axis of the second rotating joint is consistent with the rotation axis of the first rotating joint; the other end of the third support rod is rotatably mounted with the roller. One end of the connecting rod is rotatably connected to the body of the third support rod to form a third rotating joint, and the rotation axis of the third rotating joint is consistent with the rotation axis of the first rotating joint; the other end of the connecting rod is provided with an external thread and is threadedly connected to the positioning nut through the guide hole.

8. The online pipe coating repair device according to claim 6, characterized in that, The roller is made of elastic soft rubber.

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