A small branch pipe inner wall coating treatment device with positioning support

Abstract

The embodiment of the present disclosure provides a small branch pipe inner wall coating treatment device with a positioning support, which comprises a positioning cleaning mechanism, the positioning cleaning mechanism comprises a mounting ring plate, the outer surface of the mounting ring plate is surrounded by a protective cover plate, a mounting pin rod is arranged between the mounting ring plate and the protective cover plate, and a cover plate clamping plate is arranged on the protective cover plate. The moving frame of the present application cooperates with the moving wheel and the stretching spring to adapt to the inner diameter of the branch pipe and stably position the moving frame. The adjusting frame assists in adjusting the position of the moving frame to ensure that the device is centered. The driving motor drives the cleaning turntable to rotate through the driving turn rod. The cleaning soft plate on the cleaning turntable can efficiently remove the inner wall coating and corrosion products, and expose the metal luster of the pipe wall. The overall structure is stably supported by the mounting ring plate, the protective cover plate and other components, the precise cleaning of the inner wall of the small branch pipe with different depths is realized, the corrosion pits are effectively treated, and the beneficial effects of stable operation and efficient cleaning are achieved.

Description

Technical Field

[0001] The embodiments disclosed herein belong to the field of pipe wall coating technology, specifically relating to a coating treatment device for the inner wall of a small branch pipe with a positioning bracket. Background Technology

[0002] The essential service wateryard pipe network is a component of the nuclear power plant's essential service water system (SEC). It is responsible for transporting seawater drawn in by the SEC pumps to the heat exchangers for cooling, and then discharging the cooled seawater through a sump into the drainage ditch via a drain pipe.

[0003] In existing technology, the main pipe of a nuclear power SEC system contains small branch pipes made of carbon steel (carbon steel pipes have poor corrosion resistance in seawater), and the inside of these pipes is coated with a corrosion-resistant coating. However, as these small branch pipes enter service, the coating can blister and peel off due to erosion and corrosion of the main pipe, leading to continuous and large-scale coating peeling. Since the SEC system is one of the most important systems in nuclear power, it is necessary not only to ensure the high reliability of the small branch pipes but also to prevent the coating from peeling off and causing foreign objects to accumulate inside the pipes. However, due to the small inner diameter of the branch pipe, typically between 50 and 80 mm, conventional grinding tools cannot penetrate deeply and provide visual grinding. The conventional method is to replace the branch pipe with one that has an inner wall coating or to repair the damaged areas by recoating. However, frequent replacement of branch pipes not only incurs high spare parts costs and downtime losses, but also makes it difficult to guarantee coating adhesion and uniformity due to factors such as the small space inside the pipe, rust at the damaged coating site, and poor coating repair quality. This can easily lead to the risk of foreign matter detaching secondary and the risk of accelerated corrosion of the branch pipe resulting in insufficient safety margin.

[0004] Therefore, how to solve the above problems has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] The embodiments disclosed herein aim to at least solve one of the technical problems existing in the prior art, and provide a coating treatment device for the inner wall of a small branch pipe with a positioning bracket.

[0006] One aspect of the embodiments of this disclosure provides a coating treatment device for the inner wall of a small branch pipe with a positioning bracket, comprising: A positioning cleaning mechanism includes a mounting ring plate, the outer surface of which is surrounded by a protective cover plate, and a mounting pin is provided between the mounting ring plate and the protective cover plate; a cover plate clamping plate is provided on the protective cover plate, and an adjustment frame is provided on the cover plate clamping plate; both ends of the adjustment frame are provided with movable frames, and one end of the movable frame is provided with a movable wheel.

[0007] Optionally, a tension spring is provided between the two movable frames, a drive motor is provided on the inner surface of the protective cover, and a drive rod is provided at one end of the drive motor; a docking cover is provided on the outer surface of the drive rod, a cleaning turntable is provided at the end of the drive rod away from the drive motor, a mounting frame is surrounded on the outer surface of the cleaning turntable, and a cleaning soft plate is provided in the mounting frame.

[0008] Optionally, a movable grinding mechanism is provided on one side of the mounting ring plate. The movable grinding mechanism includes a clamping plate. A connecting pin is provided on the clamping plate. A protective soft cover is provided at one end of the connecting pin. An outer extension tube is provided on the side of the protective soft cover away from the connecting pin. A folding drive wheel is provided on the outer extension tube. A grinding pin is provided at one end of the outer extension tube. A drive gear is provided on the outer surface of the grinding pin. A mating pinion is provided on the outer surface of the drive gear.

[0009] Optionally, a mounting adapter is provided on one side of the docking pinion, and a docking operating wheel is provided on the side of the mounting adapter away from the docking pinion; an inner wall grinding ring is provided on the outer surface of the docking operating wheel, and a connecting soft sleeve is provided on one side of the inner wall grinding ring; a grinding protection frame is provided on one side of the connecting soft sleeve, and a grinding motor is provided in the grinding protection frame.

[0010] Optionally, the outer surface of the grinding protective frame is provided with a push camera mechanism, the push camera mechanism includes a docking sleeve, one end of the docking sleeve is provided with a push rod; a camera base is provided on the push rod, an adjustment bracket is provided on the camera base, and a camera is provided at the end of the adjustment bracket away from the camera base.

[0011] Optionally, the inner surface of the docking sleeve is nested on the outer surface of the grinding protective frame, and one end of the docking sleeve is docked to the connecting soft sleeve cover; one end of the push rod is docked to the docking sleeve, the camera base is welded and installed on the push rod, and one end of the adjusting bracket is docked to the camera base; the camera is docked and installed on the end of the adjusting bracket away from the camera base, and the outer surface of the push rod is stably pushed in the branch pipe by clamping of the clamp.

[0012] Optionally, the clamping plate is placed on one side of the inner surface of the mounting ring plate, one end of the connecting pin is welded to the protective soft cover, and the outer surface of the connecting pin passes through the mounting ring plate and is fixed to the clamping plate; one end of the outer expansion plate tube is connected to the side of the protective soft cover away from the connecting pin, and one end of the folding drive wheel is connected to the outer surface of the outer expansion plate tube; one end of the grinding pin is connected to the end of the outer expansion plate tube away from the protective soft cover, and the end of the grinding pin away from the outer expansion plate tube is connected to the inner surface of the drive gear for support, and the outer surface of the engaging pinion meshes with the outer surface of the drive gear.

[0013] Optionally, the two sides of the mounting adapter are respectively connected between the docking pinion and the docking operating wheel, and the outer surface of the docking operating wheel is nested in the inner surface of the inner wall grinding ring; the end of the outer expansion plate tube away from the protective soft cover is connected to the connecting soft cover, and one end of the grinding motor is connected to the connecting soft cover; one end of the grinding motor is connected to the inner surface of the drive gear, and the inner surface of the grinding protective frame is nested in the outer surface of the grinding motor.

[0014] Optionally, one end of the protective cover plate contacts the mounting ring plate, and the outer surface of the mounting pin rod passes through the mounting ring plate and is fixed to the protective cover plate; one end of the cover plate clamping plate is welded to the outer surface of the protective cover plate, and the adjusting frame is snapped onto the cover plate clamping plate; one end of the movable frame is connected to one end of the adjusting frame, the movable wheel is connected to the movable frame, and the two ends of the tension spring are respectively connected between the two movable frames.

[0015] Optionally, the drive motor is fixedly installed in the protective cover plate, and one end of the drive rod is connected to one end of the drive motor; the end of the drive rod away from the drive motor is connected to the cleaning turntable, and the connecting cover plate is connected to the end of the protective cover plate away from the mounting ring plate; a plurality of mounting brackets are mounted around the outer surface of the cleaning turntable, and one end of the cleaning soft plate is connected to the mounting bracket.

[0016] The beneficial effects of the embodiments of this disclosure include: 1. The movable frame and movable wheels of this invention, in conjunction with a tension spring, can adapt to the inner diameter of the branch pipe (65mm~80mm) and maintain stable positioning. The adjustment frame assists in adjusting the position of the movable frame to ensure the device is centered. The drive motor drives the cleaning turntable to rotate via a drive rod. The cleaning soft plate on the cleaning turntable can efficiently remove the inner wall coating and corrosion products, exposing the metallic luster of the pipe wall. The overall structure provides stable support through components such as mounting ring plates and protective covers, achieving precise cleaning of different depths (≥200mm) of the inner wall of small branch pipes, effectively treating corrosion pits, and achieving the beneficial effects of stable operation and efficient cleaning.

[0017] 2. The clamping plate and connecting pin of this invention cooperate to fix the mechanism to the mounting ring plate, ensuring overall stability. The folding drive wheel auxiliary device on the outer extension plate moves within the branch pipe and adapts to different inner diameters (65mm~80mm). The grinding motor drives the drive gear, which, through meshing with the docking pinion and transmission of the mounting adapter, drives the docking operating wheel and the inner wall grinding ring to rotate, achieving efficient grinding of the inner wall coating. The grinding protective frame protects the motor, and the connecting soft sleeve enhances the structural connection stability. Through the synergy of power transmission and movement positioning, the entire system achieves precise grinding of the inner wall depth of the small branch pipe ≥200mm, effectively removing corrosion products and coatings, exposing the metallic luster of the pipe wall, and achieving the beneficial effects of stable operation and efficient processing.

[0018] 3. The mating sleeve of this invention is nested on the outer surface of the grinding protective frame and connected to the soft sleeve cover, providing stable support for the mechanism. The push rod is held in the branch pipe by the clamp and pushed smoothly, driving the camera base and adjustment bracket to move. The adjustment bracket can adjust the camera angle to accurately align it with the grinding area. The camera captures the grinding status of the inner wall in real time, realizing visual monitoring of the coating grinding process on the inner wall of the small branch pipe, ensuring that the corrosion pits are thoroughly treated and the coating removal effect meets the standards, achieving the beneficial effects of accurately controlling the grinding quality and improving the reliability of operation. Attached Figure Description

[0019] Figure 1 A schematic diagram of a coating polishing tool for a small branch pipe inner wall coating treatment device with a positioning bracket is provided in one embodiment of this application, wherein the figure shows; Figure 2 An overall perspective view of a coating treatment device for the inner wall of a small branch pipe with a positioning bracket is provided for one embodiment of this application; Figure 3 An exploded perspective view of a device for coating the inner wall of a small branch pipe with a positioning bracket is provided for one embodiment of this application. Figure 4 A perspective view of a positioning and cleaning mechanism for a small branch pipe inner wall coating treatment device with a positioning bracket is provided in one embodiment of this application; Figure 5 An exploded perspective view of a positioning and cleaning mechanism for a small branch pipe inner wall coating treatment device with a positioning bracket is provided in one embodiment of this application. Figure 6 A perspective view of the protective cover plate of a coating treatment device for the inner wall of a small branch pipe with a positioning bracket is provided for one embodiment of this application; Figure 7 An internal disassembly perspective view of the positioning and cleaning mechanism of a small branch pipe inner wall coating treatment device with positioning bracket is provided for one embodiment of this application; Figure 8A perspective disassembly view of the moving grinding mechanism of a coating treatment device for the inner wall of a small branch pipe with a positioning bracket is provided for one embodiment of this application. Figure 9 A partial perspective view of an installation adapter frame for a coating treatment device for the inner wall of a small branch pipe with a positioning bracket is provided for one embodiment of this application; Figure 10 A perspective view of a push camera mechanism for a small branch pipe inner wall coating treatment device with a positioning bracket is provided for one embodiment of this application; Figure 11 This application provides a schematic diagram of the technical route for a coating polishing tool (spot polishing) of a coating treatment device for the inner wall of a small branch pipe with a positioning bracket, according to one embodiment of the present application.

[0020] Legend: 1. Positioning cleaning mechanism; 11. Mounting ring plate; 12. Mounting pin; 13. Protective cover plate; 14. Cover plate clamping plate; 15. Adjusting frame; 17. Tension spring; 18. Drive motor; 19. Drive rotating rod; 110. Connecting cover plate; 111. Cleaning turntable; 112. Mounting frame; 113. Cleaning soft plate; 114. Moving frame; 115. Moving wheels; 2. Mobile grinding mechanism; 21. Clamping plate; 22. Connecting pin; 23. Protective soft cover; 24. Outer expansion plate tube; 25. Folding drive wheel; 26. Inner wall grinding ring; 27. Grinding pin; 28. Drive gear; 29. ​​Connecting pinion; 210. Mounting adapter frame; 211. Connecting operating wheel; 212. Connecting soft cover; 213. Grinding protective frame; 214. Grinding motor; 3. Push camera mechanism; 31. Docking housing; 32. Push rod; 33. Camera base; 34. Adjustment bracket; 35. Camera. Detailed Implementation

[0021] To enable those skilled in the art to better understand the technical solutions of this disclosure, the disclosure will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] The embodiments of this application will be further described in detail below with reference to the accompanying drawings and examples. The detailed descriptions and accompanying drawings of the following embodiments are used to exemplarily illustrate the principles of this application, but should not be used to limit the scope of this application; that is, this application is not limited to the described embodiments. In the description of this application, it should be noted that, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," etc., indicating orientation or positional relationships are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. "Vertical" is not strictly vertical, but within the allowable error range. "Parallel" is not strictly parallel, but within the allowable error range.

[0023] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application depending on the specific circumstances.

[0024] like Figure 1-11 As shown, a coating treatment device for the inner wall of a small branch pipe with a positioning bracket includes: a clamp, a positioning rod, a bearing, a grinding wheel, and a pipe positioner. A positioning cleaning mechanism includes a mounting ring plate, the outer surface of which is surrounded by a protective cover plate. A mounting pin is provided between the mounting ring plate and the protective cover plate. A cover plate retainer is provided on the protective cover plate, and an adjustment frame is provided on the cover plate retainer plate. Both ends of the adjustment frame are provided with movable frames, and one end of each movable frame is provided with a caster wheel.

[0025] In some embodiments, a tension spring is provided between the two movable frames, a drive motor is provided on the inner surface of the protective cover, and a drive rod is provided at one end of the drive motor. A docking cover is provided on the outer surface of the drive rod, and a cleaning turntable is provided at the end of the drive rod away from the drive motor. A mounting frame surrounds the outer surface of the cleaning turntable, and a cleaning soft plate is provided in the mounting frame.

[0026] In some embodiments, a movable grinding mechanism is provided on one side of the mounting ring plate, the movable grinding mechanism including a clamping plate. A connecting pin is provided on the clamping plate, a protective soft cover is provided at one end of the connecting pin, and an outer extension tube is provided on the side of the protective soft cover away from the connecting pin. A folding drive wheel is provided on the outer extension tube, a grinding pin is provided at one end of the outer extension tube, a drive gear is provided on the outer surface of the grinding pin, and a mating pinion is provided on the outer surface of the drive gear.

[0027] In some embodiments, a mounting adapter is provided on one side of the docking pinion, and a docking operating wheel is provided on the side of the mounting adapter away from the docking pinion. An inner wall grinding ring is provided on the outer surface of the docking operating wheel, and a connecting soft sleeve is provided on one side of the inner wall grinding ring. A grinding protective frame is provided on one side of the connecting soft sleeve, and a grinding motor is housed within the grinding protective frame.

[0028] In some embodiments, the outer surface of the grinding protective frame is provided with a push camera mechanism, which includes a docking housing and a push rod at one end of the docking housing. A camera base is provided on the push rod, and an adjustment bracket is provided on the camera base. A camera is provided at the end of the adjustment bracket away from the camera base.

[0029] In some embodiments, the inner surface of the docking sleeve is nested within the outer surface of the grinding protective frame, and one end of the docking sleeve is docked to the connecting soft sleeve cover. One end of the push rod is docked to the docking sleeve, the camera base is welded and mounted on the push rod, and one end of the adjusting bracket is docked to the camera base. The camera is docked and mounted on the end of the adjusting bracket away from the camera base, and the outer surface of the push rod is smoothly pushed in the branch tube by clamping with a fixture.

[0030] In some embodiments, the clamping plate is placed on one side of the inner surface of the mounting ring plate, one end of the connecting pin is welded to the protective soft cover, and the outer surface of the connecting pin passes through the mounting ring plate and is fixed to the clamping plate. One end of the outer expansion plate tube is abutted on the side of the protective soft cover away from the connecting pin, and one end of the folding drive wheel is abutted on the outer surface of the outer expansion plate tube. One end of the grinding pin is abutted on the end of the outer expansion plate tube away from the protective soft cover, and the end of the grinding pin away from the outer expansion plate tube is abutted on the inner surface of the drive gear for support, and the outer surface of the engagement pinion meshes with the outer surface of the drive gear.

[0031] In some embodiments, the two sides of the mounting adapter are respectively connected between the docking pinion and the docking operating wheel, with the outer surface of the docking operating wheel nested within the inner surface of the inner wall grinding ring. The end of the outer expansion plate tube furthest from the protective soft cover is connected to the connecting soft sleeve cover, and one end of the grinding motor is connected to and mounted on the connecting soft sleeve cover. One end of the grinding motor is connected to the inner surface of the drive gear, and the inner surface of the grinding protective frame is nested within and mounted on the outer surface of the grinding motor.

[0032] In some embodiments, one end of the protective cover plate contacts the mounting ring plate, and the outer surface of the mounting pin passes through the mounting ring plate and is fixed to the protective cover plate. One end of the cover plate clamping plate is welded to the outer surface of the protective cover plate, and the adjusting frame is snapped onto the cover plate clamping plate. One end of the movable frame is connected to one end of the adjusting frame, the movable wheel is connected to the movable frame, and the two ends of the tension spring are respectively connected between the two movable frames.

[0033] In some embodiments, the drive motor is fixedly mounted in the protective cover, and one end of the drive rod is abutted to one end of the drive motor. The end of the drive rod away from the drive motor is abutted to the cleaning turntable, and the abutting cover is abutted to the end of the protective cover away from the mounting ring plate. A plurality of mounting brackets are mounted around the outer surface of the cleaning turntable, and one end of the cleaning flexible plate is abutted to and mounted in the mounting bracket.

[0034] This application provides the following examples, including: Example 1 like Figure 1-7 As shown, this application provides a coating treatment device for the inner wall of a small branch pipe with a positioning bracket, including: a positioning and cleaning mechanism 1, the positioning and cleaning mechanism 1 including a mounting ring plate 11, a protective cover plate 13 surrounding the outer surface of the mounting ring plate 11, and a mounting pin 12 disposed between the mounting ring plate 11 and the protective cover plate 13. A cover plate clamping plate 14 is disposed on the protective cover plate 13, an adjusting frame 15 is disposed on the cover plate clamping plate 14, a movable frame 114 is disposed at both ends of the adjusting frame 15, a movable wheel 115 is disposed at one end of the movable frame 114, and a tension spring 17 is disposed between the two movable frames 114.

[0035] A drive motor 18 is provided on the inner surface of the protective cover plate 13. A drive rod 19 is provided at one end of the drive motor 18. A docking cover plate 110 is provided on the outer surface of the drive rod 19. A cleaning turntable 111 is provided at the end of the drive rod 19 away from the drive motor 18. A mounting bracket 112 surrounds the outer surface of the cleaning turntable 111. A cleaning soft plate 113 is provided in the mounting bracket 112.

[0036] One end of the protective cover plate 13 contacts the mounting ring plate 11, and the outer surface of the mounting pin 12 passes through the mounting ring plate 11 and is fixed to the protective cover plate 13. One end of the cover plate clamping plate 14 is welded to the outer surface of the protective cover plate 13, the adjusting frame 15 is snapped onto the cover plate clamping plate 14, and one end of the moving frame 114 is connected to one end of the adjusting frame 15.

[0037] The movable wheel 115 is mounted on the movable frame 114. The two ends of the tension spring 17 are respectively mounted between the two movable frames 114. The drive motor 18 is fixedly mounted in the protective cover plate 13. One end of the drive rod 19 is mounted on one end of the drive motor 18. The end of the drive rod 19 away from the drive motor 18 is mounted on the cleaning turntable 111. The connecting cover plate 110 is mounted on the end of the protective cover plate 13 away from the mounting ring plate 11. Several mounting brackets 112 are mounted around the outer surface of the cleaning turntable 111. One end of the cleaning soft plate 113 is mounted in one of the mounting brackets 112.

[0038] In this embodiment, in response to the problem that the coating of small carbon steel branch pipes (inner diameter 65mm~80mm) in the SEC system of nuclear power plants is prone to blistering and peeling in seawater, the movable frame 114 and the movable wheel 115, together with the tension spring 17, form an adaptive positioning structure. The elastic tension makes the movable wheel 115 fit tightly against the pipe wall, so as to achieve stable in-situ positioning without disassembly.

[0039] The adjustment frame 15 assists in calibrating the central axis of the device, ensuring centered operation within narrow pipe cavities. The drive motor 18, via the drive rod 19, drives the cleaning disc 111 to rotate at high speed. The cleaning soft plate 113 efficiently removes failed coatings and rust products caused by erosion and corrosion of the main pipe, exposing the metallic luster of the pipe wall. The overall structure, with the mounting ring plate 11 and protective cover plate 13 forming a rigid support, allows operation to penetrate branch pipes to a depth ≥200mm, effectively treating corrosion pits. This avoids the high spare parts costs and downtime losses associated with routine branch pipe replacements, reduces the risk of foreign objects inside the pipe caused by coating peeling, and improves the operational reliability of small branch pipes in the SEC system.

[0040] Example 2 like Figure 1-9 As shown, a movable grinding mechanism 2 is provided on one side of the mounting ring plate 11. The movable grinding mechanism 2 includes a clamping plate 21, on which a connecting pin 22 is provided. A protective soft cover 23 is provided at one end of the connecting pin 22. An outer extension tube 24 is provided on the side of the protective soft cover 23 away from the connecting pin 22. A folding drive wheel 25 is provided on the outer extension tube 24. A grinding pin 27 is provided at one end of the outer extension tube 24.

[0041] A drive gear 28 is provided on the outer surface of the grinding pin 27, and a mating pinion 29 is provided on the outer surface of the drive gear 28. A mounting adapter 210 is provided on one side of the mating pinion 29. A mating operating wheel 211 is provided on the side of the mounting adapter 210 away from the mating pinion 29, and an inner wall grinding ring 26 is provided on the outer surface of the mating operating wheel 211. A connecting soft sleeve cover 212 is provided on one side of the inner wall grinding ring 26, and a grinding protective frame 213 is provided on one side of the connecting soft sleeve cover 212. A grinding motor 214 is provided in the grinding protective frame 213.

[0042] The clamping plate 21 is placed on one side of the inner surface of the mounting ring plate 11. One end of the connecting pin 22 is welded to the protective soft cover 23, and the outer surface of the connecting pin 22 passes through the mounting ring plate 11 and is fixed to the clamping plate 21. One end of the outer expansion plate tube 24 is connected to the side of the protective soft cover 23 away from the connecting pin 22. One end of the folding drive wheel 25 is connected to the outer surface of the outer expansion plate tube 24, and one end of the grinding pin 27 is connected to the end of the outer expansion plate tube 24 away from the protective soft cover 23.

[0043] The end of the grinding pin 27 away from the outer expansion plate tube 24 is supported by the inner surface of the drive gear 28, and the outer surface of the docking pinion 29 meshes with the outer surface of the drive gear 28. The two sides of the mounting adapter 210 are respectively docked between the docking pinion 29 and the docking operating wheel 211, and the outer surface of the docking operating wheel 211 is nested in the inner surface of the inner wall grinding ring 26.

[0044] One end of the outer expansion plate tube 24, away from the protective soft cover 23, is connected to the connecting soft cover 212, and one end of the grinding motor 214 is connected to and installed on the connecting soft cover 212. One end of the grinding motor 214 is connected to the inner surface of the drive gear 28, and the inner surface of the grinding protective frame 213 is nested and installed on the outer surface of the grinding motor 214.

[0045] In this embodiment, addressing the issue of limited space for coating repair in small branch pipes (inner diameter 65mm~80mm) of nuclear power SEC systems, the clamping plate 21 and connecting pin 22 cooperate to form a quick-installation structure, achieving a rigid connection with the positioning and cleaning mechanism 1 and ensuring operational stability under high-pressure conditions inside the pipe. The folding drive wheel 25 on the outer extension plate pipe 24 adopts a segmented design, which can adapt to different pipe diameters and provide axial propulsion power, solving the problem that conventional tools cannot penetrate long-distance (≥200mm) branch pipes.

[0046] The grinding motor 214, through the meshing transmission of the drive gear 28 and the mating pinion 29, drives the inner wall grinding ring 26 to form a planetary grinding trajectory, uniformly removing the failed coating and avoiding the problem of insufficient coating adhesion caused by manual repair. The grinding protective frame 213 and the connecting soft sleeve cover 212 form a double protection system to prevent grinding debris from contaminating the cavity. Through the synergy of power transmission and moving positioning, it achieves efficient removal of corrosion products and coatings, providing a surface treatment quality that meets nuclear power safety standards for subsequent recoating and reducing the risk of secondary peeling.

[0047] Example 3 like Figure 1-11 As shown, a push camera mechanism 3 is provided on the outer surface of the polishing protective frame 213. The push camera mechanism 3 includes a docking housing 31, a push rod 32 is provided at one end of the docking housing 31, and a camera base 33 is provided on the push rod 32. An adjustment bracket 34 is provided on the camera base 33, and a camera 35 is provided at the end of the adjustment bracket 34 away from the camera base 33.

[0048] The inner surface of the docking sleeve 31 is nested within the outer surface of the polishing protective frame 213. One end of the docking sleeve 31 is docked to the connecting soft sleeve 212, and one end of the push rod 32 is docked to the docking sleeve 31. The camera base 33 is welded onto the push rod 32, and one end of the adjusting bracket 34 is docked to the camera base 33. The camera 35 is docked onto the end of the adjusting bracket 34 furthest from the camera base 33. The outer surface of the push rod 32 is held in place by a clamp and pushed smoothly within the branch pipe.

[0049] In this embodiment, addressing the challenge of visualizing the grinding quality of the inner wall of small branch pipes in nuclear power SEC systems, a docking sleeve 31 is nested within the outer surface of the grinding protective frame 213 to form an integrated structure. The push rod 32 achieves stable axial advancement through a precision clamp, accurately delivering the camera 35 to a grinding area with a depth of ≥200mm. The adjusting bracket 34 supports multi-angle rotation, enabling the camera 35 to capture real-time images of key areas such as corrosion pits and coating residues on the inner wall, solving the problem that conventional tools cannot intuitively monitor the work results. Through visual feedback, operators can accurately judge the degree of coating removal, ensuring that the metal surface of the pipe wall meets the requirements for recoating, avoiding the risk of thinning of the branch pipe wall due to blind grinding, providing quality assurance for the in-situ repair of small branch pipes in nuclear power SEC systems, and improving the safety margin of nuclear power plants.

[0050] Working principle: like Figure 1-11As shown, the device addresses the in-situ treatment needs of small branch pipes (inner diameter 50~80mm) in the SEC system of nuclear power plants. It achieves adaptive positioning after pipe insertion through the positioning and cleaning mechanism 1. The mounting ring plate 11 and the protective cover plate 13 form a corrosion-resistant main frame through the mounting pin 12. The adjustment frame 15 on the cover plate clamping plate 14, together with the moving frame 114 and the tension spring 17, allows the moving wheel 115 to automatically adjust the tension according to the pipe diameter, ensuring centering stability in the seawater corrosion environment.

[0051] The movable wheel 115 is made of wear-resistant and corrosion-resistant material, and can be pushed along the branch pipe axis to a corrosion area with a depth of ≥200mm, providing rigid support for cleaning and grinding operations. The drive system realizes the coordinated operation of the cleaning turntable 111 and the inner wall grinding ring 26 through motor transmission, first removing large areas of peeling coating and loose rust, and then performing fine grinding. With the real-time visual monitoring of the push camera mechanism 3, an integrated operation process of "positioning-cleaning-grinding-quality inspection" is formed, avoiding the system downtime risk caused by routine branch pipe replacement, solving the technical bottleneck of poor coating re-repair quality, and ultimately improving the operational reliability of the SEC system's small branch pipes and the nuclear power safety margin.

[0052] After positioning is completed, the positioning and cleaning mechanism 1 initiates a pre-cleaning process for the floating rust and loose coating on the inner wall of the small branch pipes of the nuclear power plant's SEC system. The drive motor 18 inside the protective cover 13 drives the drive rod 19 to rotate, causing the cleaning turntable 111 at the end to rotate synchronously. A corrosion-resistant cleaning soft plate 113 is installed on the mounting bracket 112 surrounding the outer surface of the cleaning turntable 111. This plate rotates at high speed with the turntable and contacts the inner wall, efficiently removing the floating coating, loose corrosion products, and impurities caused by seawater erosion, initially revealing the metallic luster of the pipe wall. The docking cover 110 covers the connection between the drive rod 19 and the cleaning turntable 111, preventing abrasion debris from entering the transmission structure, avoiding operational risks to the SEC system due to foreign object residue, and ensuring a stable and continuous pre-cleaning process.

[0053] After pre-cleaning, the mobile grinding mechanism 2 initiates deep processing. It is fixed to the mounting ring plate 11 via the clamping plate 21 and connecting pin 22, forming a rigid whole with the positioning cleaning mechanism 1. This adapts to the long-distance operation requirements of the SEC system branch pipe depth ≥200mm. The folding drive wheel 25 on the outer extension plate pipe 24 adopts an anti-corrosion bearing design. The auxiliary device moves axially within the branch pipe, ensuring smooth advancement within narrow cavities.

[0054] The grinding motor 214 outputs power to the drive gear 28, which, through meshing with the docking pinion 29, drives the docking operation wheel 211 and the inner wall grinding ring 26 to rotate at high speed via the mounting adapter 210. The inner wall grinding ring 26 contacts the pre-cleaned inner wall, effectively treating the corrosion pits and thoroughly removing residual corrosion products and stubborn coatings from the pits.

[0055] The soft sleeve 212 seals the connection between the outer expansion plate tube 24 and the grinding motor 214. The grinding protective frame 213 wraps around the motor to isolate debris, ensuring efficient power transmission and structural stability, and providing surface treatment quality that meets nuclear power safety standards for subsequent recoating.

[0056] During the polishing process, the push camera mechanism 3 enables nuclear power plant-grade visual monitoring. The docking sleeve 31 is nested on the outer surface of the polishing protective frame 213 and docked with the soft sleeve 212, providing shock-resistant support for the monitoring components. The push rod 32 is clamped in the branch pipe by an external anti-corrosion clamp and moves axially synchronously with the device, driving the camera base 33 and the adjusting bracket 34 to advance to the critical corrosion area. The adjusting bracket 34 can flexibly adjust the pitch angle of the camera 35 to ensure that the lens is accurately aligned with the polishing area. The camera 35 acquires images of the inner wall in real time and provides feedback on the polishing status (such as the degree of pit treatment and the effect of coating removal).

[0057] Operators dynamically adjust the speed, torque, and device propulsion speed of the grinding motor 214 based on the monitoring screen to avoid excessive grinding that could lead to thinning of the branch pipe wall or secondary peeling of the residual coating. This ensures that the metal luster of the pipe wall is uniformly exposed, meets the quality traceability requirements of nuclear power plants for the repair of critical systems, and ultimately achieves high-quality in-situ treatment of the coating on the inner wall of the small branch pipe.

[0058] It is understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of this disclosure, and this disclosure is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and substance of this disclosure, and these modifications and improvements are also considered to be within the scope of protection of this disclosure.

Claims

1. A device for coating the inner wall of a small branch pipe with a positioning bracket, characterized in that, include: A positioning cleaning mechanism includes a mounting ring plate, the outer surface of which is surrounded by a protective cover plate, and a mounting pin is provided between the mounting ring plate and the protective cover plate; a cover plate clamping plate is provided on the protective cover plate, and an adjustment frame is provided on the cover plate clamping plate; both ends of the adjustment frame are provided with movable frames, and one end of the movable frame is provided with a movable wheel.

2. The device for coating the inner wall of a small branch pipe with a positioning bracket according to claim 1, characterized in that, A tension spring is provided between the two movable frames. A drive motor is provided on the inner surface of the protective cover plate. A drive rod is provided at one end of the drive motor. A docking cover plate is provided on the outer surface of the drive rod. A cleaning turntable is provided at the end of the drive rod away from the drive motor. A mounting frame is surrounded on the outer surface of the cleaning turntable. A cleaning soft plate is provided in the mounting frame.

3. The device for coating the inner wall of a small branch pipe with a positioning bracket according to claim 2, characterized in that, A movable grinding mechanism is provided on one side of the mounting ring plate. The movable grinding mechanism includes a clamping plate. A connecting pin is provided on the clamping plate. A protective soft cover is provided at one end of the connecting pin. An outer extension tube is provided on the side of the protective soft cover away from the connecting pin. A folding drive wheel is provided on the outer extension tube. A grinding pin is provided at one end of the outer extension tube. A drive gear is provided on the outer surface of the grinding pin. A mating pinion is provided on the outer surface of the drive gear.

4. The device for coating the inner wall of a small branch pipe with a positioning bracket according to claim 3, characterized in that, A mounting adapter is provided on one side of the docking pinion, and a docking operating wheel is provided on the side of the mounting adapter away from the docking pinion; an inner wall grinding ring is provided on the outer surface of the docking operating wheel, and a connecting soft sleeve is provided on one side of the inner wall grinding ring; a grinding protection frame is provided on one side of the connecting soft sleeve, and a grinding motor is provided in the grinding protection frame.

5. The device for coating the inner wall of a small branch pipe with a positioning bracket according to claim 4, characterized in that, The outer surface of the polishing protective frame is provided with a push camera mechanism, which includes a docking sleeve, one end of which is provided with a push rod; a camera base is provided on the push rod, an adjustment bracket is provided on the camera base, and a camera is provided at the end of the adjustment bracket away from the camera base.

6. The device for coating the inner wall of a small branch pipe with a positioning bracket according to claim 5, characterized in that, The inner surface of the docking sleeve is nested within the outer surface of the grinding protective frame, and one end of the docking sleeve is docked to the connecting soft sleeve cover; one end of the push rod is docked to the docking sleeve, the camera base is welded and installed on the push rod, and one end of the adjusting bracket is docked to the camera base; the camera is docked and installed on the end of the adjusting bracket away from the camera base, and the outer surface of the push rod is held in the branch pipe by a clamp for stable pushing.

7. The device for coating the inner wall of a small branch pipe with a positioning bracket according to claim 4, characterized in that, The clamping plate is placed on one side of the inner surface of the mounting ring plate. One end of the connecting pin is welded to the protective soft cover, and the outer surface of the connecting pin passes through the mounting ring plate and is fixed to the clamping plate. One end of the outer expansion plate tube is connected to the side of the protective soft cover away from the connecting pin, and one end of the folding drive wheel is connected to the outer surface of the outer expansion plate tube. One end of the grinding pin is connected to the end of the outer expansion plate tube away from the protective soft cover, and the end of the grinding pin away from the outer expansion plate tube is connected to the inner surface of the drive gear for support. The outer surface of the engagement pinion meshes with the outer surface of the drive gear.

8. The device for coating the inner wall of a small branch pipe with a positioning bracket according to claim 4, characterized in that, The two sides of the mounting adapter are respectively connected between the docking pinion and the docking operating wheel, and the outer surface of the docking operating wheel is nested in the inner surface of the inner wall grinding ring; the end of the outer expansion plate tube away from the protective soft cover is connected to the connecting soft cover, and one end of the grinding motor is connected to the connecting soft cover; one end of the grinding motor is connected to the inner surface of the drive gear, and the inner surface of the grinding protective frame is nested in the outer surface of the grinding motor.

9. The device for coating the inner wall of a small branch pipe with a positioning bracket according to claim 2, characterized in that, One end of the protective cover plate contacts the mounting ring plate, and the outer surface of the mounting pin rod passes through the mounting ring plate and is fixed to the protective cover plate; one end of the cover plate clamping plate is welded to the outer surface of the protective cover plate, and the adjusting frame is snapped onto the cover plate clamping plate; one end of the movable frame is connected to one end of the adjusting frame, the movable wheel is connected to the movable frame, and the two ends of the tension spring are respectively connected between the two movable frames.

10. The device for coating the inner wall of a small branch pipe with a positioning bracket according to claim 2, characterized in that, The drive motor is fixedly installed in the protective cover plate, and one end of the drive rod is connected to one end of the drive motor; the end of the drive rod away from the drive motor is connected to the cleaning turntable, and the connecting cover plate is connected to the end of the protective cover plate away from the mounting ring plate; a plurality of mounting brackets are mounted around the outer surface of the cleaning turntable, and one end of the cleaning soft plate is connected to the mounting bracket.

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