Direct current grounding electrode adjacent buried pipeline break point anticorrosive coating processing device

Abstract

The application discloses a kind of direct current grounding electrode adjacent place buried pipeline break point anticorrosive coating processing device, belongs to anticorrosive coating processing technical field, direct current grounding electrode adjacent place buried pipeline break point anticorrosive coating processing device includes support ring, feeding mechanism, flexible cover, fixed ring, expansion mechanism, stirring mechanism and mixing mechanism, feeding mechanism is provided on support ring, support ring bottom is equipped with flexible cover, expansion mechanism limits the unfolding depth of flexible cover, mixing mechanism is provided on stirring mechanism, and the lower end of mixing mechanism extends into mixed interval.This application, by the flexible cover of unfolding, realizes the storage of container before stirring, guarantees the instant mixing effect of material, conveniently stores and carries and handles, when material is sent into receiving kettle, through the pipeline of receiving kettle bottom side and infiltrates into flexible cover, through stirring mechanism, it is rapidly mixed and handled, improves the full mixing efficiency of material.

Description

Technical Field

[0001] This invention belongs to the field of anti-corrosion coating processing technology, and in particular relates to an anti-corrosion coating processing device for buried pipeline damage points near DC grounding electrodes. Background Technology

[0002] High-voltage direct current (HVDC) transmission systems generally operate in two modes: bipolar and unipolar. Under normal operating conditions, they operate in bipolar-to-ground mode. In this mode, the current flowing into the ground is the system's unbalanced current, less than 1% of the output current. However, its magnitude and direction change over time, exhibiting fluctuations, which can cause dynamic DC interference to nearby buried metal structures. During the initial construction and commissioning of HVDC transmission systems, annual maintenance, or troubleshooting, unipolar-to-ground mode is used. In this mode, a current of several thousand amperes flows into the ground at the DC grounding electrode (or flows from the ground into the grounding electrode), forming a constant DC voltage field in the soil at the electrode site. If there are underground metal pipes or armored cables or other metal facilities near the electrode site, these facilities provide a better conductive path for the ground current than the soil, so some of the current will flow to distant locations through these facilities. Such a large current will generate stray current interference in buried long-distance pipelines and station equipment within a range of tens or even hundreds of kilometers. It will form stray currents flowing in and out of the buried pipelines. The risk of pipeline corrosion is greatly increased at the outflow point, and there is an overprotection risk at the inflow point, which may cause safety problems such as hydrogen embrittlement and hydrogen-induced cracking of the pipe material.

[0003] In both the power industry and the oil and gas pipeline operation and maintenance industry, buried oil and gas pipelines near DC grounding electrodes require frequent excavation, inspection, and on-site corrosion protection and repair. This includes using surface coatings such as anti-corrosion paints and tapes for pipeline maintenance, a process typically carried out manually. On-site maintenance has revealed that multi-component viscous coatings need to be mixed during corrosion protection. However, since pipelines are often installed outdoors, manual mixing is usually required, resulting in low efficiency. Therefore, there is an urgent need for new pipeline corrosion protection and repair devices that are easy to apply and provide reliable coating in oil and gas pipeline operation and maintenance projects.

[0004] Chinese patent application CN114146643A discloses a powder coating processing apparatus, including a melting mechanism and a pressing mechanism. The melting mechanism includes a melting tank, two stirring rods, and a rotating component. The melting tank is mounted on a support frame, and a pre-melting tank is located eccentrically at the bottom of the melting tank. The bottoms of the two stirring rods are respectively located inside the melting tank and the pre-melting tank, with their tops penetrating a horizontal plate. A turntable is located at the top of the stirring rods, and several columns are arranged sequentially along the circumference of the top of the turntable. The rotating component includes a first motor and an annular plate. Several U-shaped slots are arranged sequentially along the circumference of the inner wall of the annular plate, with the columns matching the U-shaped slots. A bracket is located at the top of the annular plate, and the output shaft of the first motor is connected to the bracket. The pressing mechanism includes two rollers and a displacement component, which is used to adjust the distance between the two rollers. While it's possible to pre-melt a portion of the raw materials in a small melting tank and then melt and mix all the raw materials in a large melting tank, this approach requires a large amount of equipment, lacks adaptability to different sites during pipeline processing, lacks portability, and affects the efficiency of coating processing. Summary of the Invention

[0005] The purpose of this invention is to provide a device for processing anti-corrosion coatings on damaged points of buried pipelines near DC grounding electrodes, in order to solve the problems of lack of adaptability to different sites during pipeline processing and lack of portability.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A device for processing anti-corrosion coatings at damaged points of buried pipelines near DC grounding electrodes is disclosed. The device includes a support ring, a feeding mechanism, a flexible cover, a fixed ring, an expansion mechanism, a stirring mechanism, and a mixing mechanism. The feeding mechanism is mounted on the support ring. A flexible cover is located at the bottom of the support ring, and a fixed ring is located at the upper end of the flexible cover. The outlet of the feeding mechanism is connected to the inner cavity of the flexible cover. The fixed ring is connected to the upper end of the expansion mechanism. The lower end of the expansion mechanism extends downward along the axial direction of the fixed ring and connects to the lower end of the flexible cover. The expansion mechanism is retractable in its extension direction to limit the expansion depth of the flexible cover. A drive motor is fixedly mounted on the top of the support ring, and the drive motor is drivenly connected to the upper end of the stirring mechanism. An upwardly protruding mounting boss is provided on the bottom wall of the flexible cover. The lower end of the stirring mechanism is rotatably connected to the mounting boss. A mixing interval is formed between the outer wall of the mounting boss and the inner wall of the flexible cover. A mixing mechanism is mounted on the stirring mechanism, and the lower end of the mixing mechanism extends into the mixing interval.

[0008] As a further description of the above technical solution:

[0009] The feeding mechanism includes a mixing frame and at least two receiving vessels disposed on the mixing frame. The top of the receiving vessels has an inlet, and the outlet of the receiving vessels is connected to the inner cavity of the flexible cover.

[0010] As a further description of the above technical solution:

[0011] The expansion mechanism includes a fixed sleeve, a fixed block, a telescopic rod, a limiting bolt, and a nut. The fixed sleeve is fixedly connected to the fixed ring through the fixed block. The fixed sleeve is movably fitted onto the telescopic rod along its axial direction. The lower end of the telescopic rod is connected to the lower end of the flexible cover. The limiting bolt passes through the fixed sleeve along the radial direction of the support ring. The nut is fitted onto the limiting bolt and is threaded into the limiting bolt. The nut is embedded in the inner wall of the fixed sleeve, and the limiting bolt can abut against the side wall of the telescopic rod.

[0012] As a further description of the above technical solution:

[0013] The outer wall of the flexible cover has a crumple groove extending circumferentially along the support ring, and the cross-sectional shape of the crumple groove is conical.

[0014] As a further description of the above technical solution:

[0015] The stirring mechanism includes an extension rod and multiple stirring rods arranged sequentially along the axial direction of the support ring. A drive motor is connected to the stirring rod located at the top. Two adjacent stirring rods are connected through the extension rod. The extension rod includes an extension sleeve, a moving rod, a sliding plate, and a spring. The upper end of the moving rod is connected to the stirring rod above it and adjacent to it. The lower end of the moving rod is movably inserted through the extension sleeve along its axial direction. The lower end of the extension sleeve is connected to the stirring rod below it and adjacent to it. A groove extending along its axial direction is provided on the inner wall of the extension sleeve. The lower end of the moving rod is connected to the sliding plate. The sliding plate is movably disposed in the groove along the extension direction of the groove. The spring is sleeved on the moving rod. The two ends of the spring are fixedly connected to the extension sleeve and the sliding plate, respectively. Stirring blades are provided on the outer walls of the extension rod and the outer walls of the stirring rod.

[0016] As a further description of the above technical solution:

[0017] The cross-sectional shape of the chute and the cross-sectional shape of the slide are both rectangular; and / or, the cross-sectional shape of the stirring blade is circular.

[0018] As a further description of the above technical solution:

[0019] The mixing mechanism also includes a retainer and a retainer block. The retainer is rotatably mounted below the mounting boss. The lower end of the retainer block is inserted into the retainer block, and the upper end of the retainer block is connected to the lower end of the mixing mechanism.

[0020] As a further description of the above technical solution:

[0021] The card holder and the card block are designed to prevent rotation.

[0022] As a further description of the above technical solution:

[0023] The mixing mechanism includes a mixing rod, a transmission rod, and a movable rod. One end of the mixing rod is connected to the stirring mechanism, and the other end of the mixing rod extends radially outward along the support ring and is connected to the upper end of the transmission rod. The lower end of the transmission rod extends into the mixing interval and is connected to the movable rod.

[0024] As a further description of the above technical solution:

[0025] The extension rod also includes a sealing gasket located at the upper end of the moving rod, which is positioned between the adjacent stirring rod and the moving rod.

[0026] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0027] 1. In this invention, through the designed flexible cover and expansion mechanism, the flexible cover can be unfolded with the external expansion mechanism. When the flexible cover needs to be unfolded, it can be separated from the telescopic rod by turning the limiting bolt. At this time, the fixing sleeve and fixing block can be pulled to drive the inner fixing ring to unfold. At this time, the fixing ring can increase the load-bearing effect on the material after unfolding. When the material is placed into the flexible cover, the stirring mechanism can be inserted into the card seat fixed in the bottom flexible cover. The unfoldable flexible cover realizes the storage of the container before stirring, ensuring the immediate mixing effect of the material. The retractable flexible cover can be stored and placed for easy carrying. The material to be mixed can be added into the receiving vessel at the corresponding position. When the material is sent into the receiving vessel, it seeps into the flexible cover through the pipe on the bottom side of the receiving vessel, improving the full mixing efficiency of the material. Moreover, after the material is put into the flexible cover, it can be quickly mixed by the stirring mechanism.

[0028] 2. In this invention, the designed stirring mechanism can drive the stirring rod to rotate through the output shaft of the drive motor. The stirring rod can drive the outer wall stirring blades and the bottom stirring blades to rotate synchronously under the limiting action of the drawing board. The rotation of the stirring blades can fully mix the materials. Through the cooperation of the spring and the expansion rod, the flexible cover and the fixed ring can be unfolded, which is conducive to maintaining the mixing effect after unfolding, improving the mixing adaptability. Furthermore, the designed chute and slide plate can prevent the stirring rod and the expansion rod from rotating.

[0029] 3. In this invention, the designed card holder and card block can be inserted into the card holder through the card rod at the bottom of the extension rod, and can be separated from the drive motor through the top coupling, so that the stirring rod and the extension rod can be easily separated. The stirring rod can be easily removed and placed in the flexible cover, which improves the placement effect. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the overall structure of an anti-corrosion coating processing device for buried pipeline damage points near DC grounding electrodes proposed in this invention.

[0031] Figure 2 This is a front view schematic diagram of an anti-corrosion coating processing device for buried pipeline damage points near DC grounding electrodes proposed in this invention;

[0032] Figure 3 The present invention proposes Figure 2 Enlarged structural diagram of part A in the middle;

[0033] Figure 4 The present invention proposes Figure 2 Enlarged structural diagram of section B;

[0034] Figure 5 This is a side view of the receiving vessel structure of the anti-corrosion coating processing device for buried pipeline damage points near DC grounding electrodes proposed in this invention.

[0035] Figure 6 This is a schematic diagram of the assembly structure of the mixing mechanism of the anti-corrosion coating processing device for buried pipeline damage points near DC grounding electrodes proposed in this invention.

[0036] Figure 7 This is a schematic diagram of the fixed sleeve structure of a device for processing anti-corrosion coatings at the damaged point of a buried pipeline near a DC grounding electrode, as proposed in this invention.

[0037] Legend:

[0038] 1. Support ring; 2. Feeding mechanism; 201. Mixing frame; 202. Receiving vessel; 203. Filling ring; 3. Expansion mechanism; 301. Fixing sleeve; 302. Limiting bolt; 303. Sliding sleeve; 304. Telescopic rod; 305. Fixing block; 4. Stirring mechanism; 401. Stirring rod; 402. Sealing gasket; 403. Moving rod; 404. Spring; 405. Slide plate; 406. Slide groove; 407. Locking block; 408. Locking seat; 409. Extension rod; 5. Mixing mechanism; 501. Mixing rod; 502. Transmission rod; 503. Movable rod; 6. Drive motor; 7. Flexible cover; 8. Fixing ring; 9. Support frame. Detailed Implementation

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] Please see Figure 1-7 This invention provides a technical solution: a device for processing anti-corrosion coatings at damaged points of buried pipelines near DC grounding electrodes. The device includes a support ring 1, a feeding mechanism 2, a flexible cover 7, a fixing ring 8, an expansion mechanism 3, a stirring mechanism 4, and a mixing mechanism 5. The feeding mechanism 2 is mounted on the support ring 1, and the flexible cover 7 is located at the bottom of the support ring 1. The fixing ring 8 is located at the upper end of the flexible cover 7. The flexible cover 7 includes at least two flexible segments arranged axially, with adjacent flexible segments connected by the fixing ring. The outlet of the feeding mechanism 2 is connected to the inner cavity of the flexible cover 7. The fixed ring 8 is connected to the upper end of the expansion mechanism 3. The lower end of the expansion mechanism 3 extends downward along the axial direction of the fixed ring 8 and is connected to the lower end of the flexible cover 7. The expansion mechanism 3 is telescopic in its extension direction to limit the expansion depth of the flexible cover 7. The top of the support ring 1 is fixedly mounted with a drive motor 6. The drive motor 6 is drivenly connected to the upper end of the stirring mechanism 4. The bottom wall of the flexible cover 7 is provided with an upwardly protruding mounting boss. The lower end of the stirring mechanism 4 is rotatably connected to the mounting boss. A mixing interval is formed between the outer side wall of the mounting boss and the inner side wall of the flexible cover. A mixing mechanism 5 is provided on the stirring mechanism 4. The lower end of the mixing mechanism 5 extends into the mixing interval.

[0041] Please see Figure 1-7 The feeding mechanism 2 includes a mixing frame 201 and at least two receiving vessels 202 disposed on the mixing frame 201. The mixing frame 201 is fixedly connected to the outside of the support ring 1. The top of the receiving vessel 202 has an inlet, and the outlet of the receiving vessel 202 is connected to the inner cavity of the flexible cover 7. At least two receiving vessels 202 are disposed on the mixing frame 201. The top of the receiving vessel 202 has an inlet. A filling ring 203 is embedded in the top of the mixing frame 201, and the filling ring 203 surrounds the outside of the inlet of the receiving vessel and is fixedly connected to the receiving vessel 202. One side of the bottom of the receiving vessel 202 is connected to one side of the flexible cover 7 through a pipeline.

[0042] Please see Figure 1-7The expansion mechanism 3 includes a fixed sleeve 301, a fixed block 305, a telescopic rod 304, a limiting bolt 302, and a nut. The fixed sleeve 301 is fixedly connected to the fixed ring 8 through the fixed block 305. A sliding sleeve 303 is embedded in the inner cavity of the fixed sleeve 301. The fixed sleeve 301 is movably sleeved on the telescopic rod 304 along its axial direction through the sliding sleeve 303. The lower end of the telescopic rod 304 is connected to the lower end of the flexible cover 7. The limiting bolt 302 passes through the fixed sleeve 301 radially along the support ring 1. The nut is sleeved on the limiting bolt 302 and threadedly engaged with the limiting bolt 302. The nut is embedded in the inner wall of the fixed sleeve 301, and the limiting bolt 302 can abut against the side wall of the telescopic rod 304. The outer wall of the flexible cover 7 has a collapse groove extending circumferentially along the support ring 1, and the cross-sectional shape obtained by cutting the collapse groove vertically is conical.

[0043] The specific implementation method is as follows: Through the designed flexible cover 7 and expansion mechanism 3, the flexible cover 7 can unfold with the external expansion mechanism 3. When it is necessary to unfold the flexible cover 7, it can be separated from the telescopic rod 304 by tightening the limiting bolt 302. At this time, the fixing sleeve 301 and fixing block 305 can be pulled to drive the inner fixing ring 8 to unfold the flexible cover 7. The fixing ring 8 can increase the load-bearing capacity of the material after the flexible cover 7 is unfolded. When the material is placed into the flexible cover 7, the stirring mechanism 4 can be inserted into the card seat 408 fixed to the bottom of the flexible cover 7, thereby... The expandable flexible cover 7 can store the container before mixing, ensuring the immediate mixing effect of the materials. The retractable flexible cover 7 can be stored and placed for easy carrying. Through the designed filling ring 203, the materials to be mixed can be added into the corresponding receiving vessel 202. After the materials are sent into the receiving vessel 202, they can seep into the flexible cover 7 through the pipe on the bottom side of the receiving vessel 202, thereby improving the efficiency of the full mixing of the materials. After the materials are put into the flexible cover 7, they can be quickly mixed by the stirring mechanism 4.

[0044] Please see Figure 4The stirring mechanism 4 includes an extension rod 409 and a plurality of stirring rods 401 arranged sequentially along the axial direction of the support ring 1. The drive motor 6 is connected to the stirring rod 401 located at the top. Two adjacent stirring rods 401 are connected through the extension rod 409. The extension rod 409 includes an extension sleeve, a moving rod 403, a sliding plate 405, and a spring 404. The upper end of the moving rod is connected to the stirring rod 401 located above and adjacent to it. The lower end of the moving rod is movably inserted through the extension sleeve along its axial direction. The lower end of the extension sleeve is connected to the stirring rod 401 located below and adjacent to it. A groove 406 extending axially is provided on the inner wall of the extension sleeve. The lower end of the moving rod 403 is connected to the sliding plate 405. The sliding plate 405 is movably disposed within the groove 406 along its extension direction. A spring 404 is sleeved on the moving rod 403, and both ends of the spring 404 are fixedly connected to the extension sleeve and the sliding plate 405, respectively. Stirring blades are provided on the outer walls of both the extension rod 409 and the stirring rod 401. The extension rod 409 also includes a sealing gasket 402 disposed at the upper end of the moving rod 403, which is positioned between adjacent stirring rods 401 and moving rods 403. A support frame 9 is fixedly installed on one side of the drive motor 6 and is fixedly connected to the top of the support ring 1. The cross-sectional shape of the groove 406 and the sliding plate 405 are both rectangular. The cross-sectional shape obtained by cutting the stirring blade with a plane perpendicular to the axis of the stirring blade is circular.

[0045] The specific implementation method is as follows: The designed stirring mechanism 4 can drive the stirring rod 401 to rotate through the output shaft of the drive motor 6. The stirring rod 401 can drive all the stirring blades to rotate synchronously. The rotation of the stirring blades can fully mix the materials. Furthermore, through the designed extension rod 409, the extension sleeve can slide outside the slide plate 405 through the inner sliding groove 406. The movement of the extension sleeve can slide outside the moving rod 403 and squeeze the inner spring 404. Thus, the spring 404 and the extension sleeve can cooperate with the flexible cover 7 and the fixing ring 8 to unfold, which is beneficial to maintain the mixing effect after unfolding, improve the mixing adaptability, and through the designed sliding groove 406 and slide plate 405, the stirring rod 401 and the extension rod 409 can be prevented from rotating.

[0046] The stirring mechanism 4 also includes a retainer 408 and a retainer block 407. The retainer 408 is rotatably disposed below the mounting boss. The lower end of the retainer block 407 is inserted into the retainer 408, and the upper end of the retainer block 407 is connected to the lower end of the stirring mechanism 4 for detachable connection of the stirring rod 401 and the extension rod 409. The retainer 408 and the retainer block 407 are anti-rotationally coupled. The inner cavity of the retainer 408 and the cross-sectional shape of the retainer block 407 are both hexagonal. The mixing mechanism 5 includes a mixing rod 501, a transmission rod 502, and a movable rod 503. One end of the mixing rod 501 is connected to the stirring mechanism 4, and the other end of the mixing rod 501 extends radially outward along the support ring 1 and is connected to the upper end of the transmission rod 502. The lower end of the transmission rod 502 extends into the mixing interval and is connected to the movable rod 503.

[0047] The specific implementation method is as follows: Through the designed card holder 408 and card block 407, the extension rod 409 can be inserted and connected in the card holder 408 through the card rod at the bottom. After being separated from the drive motor 6 through the top coupling, the stirring rod 401 and the extension rod 409 can be easily separated, so that the stirring rod 401 can be easily removed and placed in the flexible cover 7, thereby improving the placement effect.

[0048] Working principle: During use, the flexible cover 7 and the expansion mechanism 3 are designed to expand the flexible cover 7. When it is necessary to expand the flexible cover 7, the limit bolt 302 is turned to separate it from the telescopic rod 304, and the fixing sleeve 301 and the fixing block 305 are pulled to expand the inner fixing ring 8. After the fixing ring 8 is expanded, it increases the load-bearing capacity of the material. When the material is placed into the flexible cover 7, the stirring mechanism 4 is inserted into the card seat 408 fixed on the bottom side of the flexible cover 7, and the expandable mechanism can be used to expand the material. The flexible cover 7 allows for the storage of the container before mixing, ensuring immediate mixing of materials. The retractable flexible cover 7 facilitates storage and handling. Through the designed filling ring 203, the materials to be mixed are added to the corresponding receiving vessel 202. After the materials are fed into the receiving vessel 202, they seep into the flexible cover 7 through the pipes on the bottom side of the receiving vessel 202, improving the efficiency of thorough mixing of materials. After the materials are added into the flexible cover 7, they are quickly mixed by the stirring mechanism 4.

[0049] The designed stirring mechanism 4 drives the stirring rod 401 to rotate via the output shaft of the drive motor 6. The stirring rod 401 drives the outer wall stirring blades and the bottom stirring blades to rotate synchronously under the limiting action of the sliding plate 405. The rotation of the stirring blades fully mixes the materials. The designed extension rod 409 slides outside the sliding plate 405 via the inner groove 406. The extension rod 409 moves outside the moving rod 403 and squeezes the inner spring 404. The flexible cover 7 and the fixing ring 8 are unfolded through the cooperation of the spring 404 and the extension rod 409, which helps to maintain the mixing effect after unfolding and improves the mixing adaptability. The designed groove 406 and the sliding plate 405 prevent the stirring rod 401 and the extension rod 409 from rotating.

[0050] The design of the card holder 408 and card block 407 allows the extension rod 409 to be inserted into the card holder 408 via the card rod at the bottom. After being separated from the drive motor 6 via the top coupling, the stirring rod 401 and the extension rod 409 can be easily disassembled and separated. This makes it easier to remove the stirring rod 401 and place it in the flexible cover 7, thus improving the placement effect.

[0051] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A direct current grounding electrode adjacent buried pipeline break point anticorrosive coating processing device, characterized in that, The direct current grounding electrode adjacent buried pipeline break point anticorrosive coating processing device includes a support ring (1), a feeding mechanism (2), a flexible cover (7), a fixing ring (8), an expansion mechanism (3), a stirring mechanism (4) and a mixing mechanism (5), the support ring (1) is provided with the feeding mechanism (2), the bottom of the support ring (1) is provided with the flexible cover (7), the upper end of the flexible cover (7) is provided with the fixing ring (8), the outlet of the feeding mechanism (2) is communicated with the inner cavity of the flexible cover (7), the fixing ring (8) is connected with the upper end of the expansion mechanism (3), the lower end of the expansion mechanism (3) extends downward along the axial direction of the fixing ring (8) and is connected with the lower end of the flexible cover (7), the expansion mechanism (3) is telescopic in the extending direction, so as to limit the unfolding depth of the flexible cover (7), the top of the support ring (1) is fixedly provided with a driving motor (6), the driving motor (6) is drivingly connected with the upper end of the stirring mechanism (4), the bottom wall of the flexible cover (7) is provided with an upwardly protruding mounting boss, the lower end of the stirring mechanism (4) is rotatably connected with the mounting boss, a mixing space is formed between the outer side wall of the mounting boss and the inner side wall of the flexible cover, the stirring mechanism (4) is provided with the mixing mechanism (5), and the lower end of the mixing mechanism (5) extends into the mixing space. The stirring mechanism (4) includes expansion rods (409) and a plurality of stirring rods (401) arranged in sequence along the axial direction of the support ring (1), the driving motor (6) is drivingly connected with the stirring rod (401) located at the top, two adjacent stirring rods (401) are connected through the expansion rod (409), the expansion rod (409) includes an expansion sleeve, a moving rod (403), a sliding plate (405) and a spring (404), the upper end of the moving rod is connected with the stirring rod (401) located above and adjacent to the moving rod, the lower end of the moving rod is movably arranged in the expansion sleeve along the axial direction of the moving rod, the lower end of the expansion sleeve is connected with the stirring rod (401) located below and adjacent to the expansion sleeve, the inner wall of the expansion sleeve is provided with a sliding groove (406) extending along the axial direction of the expansion sleeve, the lower end of the moving rod (403) is connected with the sliding plate (405), the sliding plate (405) is movably arranged in the sliding groove (406) along the extending direction of the sliding groove (406), the spring (404) is sleeved on the moving rod (403), and the two ends of the spring (404) are fixedly connected with the expansion sleeve and the sliding plate (405) respectively, and the outer side wall of the expansion rod (409) and the outer side wall of the stirring rod (401) are both provided with stirring blades.

2. The apparatus for processing anticorrosive coating at a breakage point of a buried pipeline in the vicinity of a DC grounding electrode according to claim 1, characterized by The feeding mechanism (2) includes a mixing frame (201) and at least two receiving kettles (202) arranged on the mixing frame (201), the top of the receiving kettle (202) is provided with an inlet, and the outlet of the receiving kettle (202) is communicated with the inner cavity of the flexible cover (7).

3. The apparatus for processing anticorrosive coating at a breakage point of a buried pipeline in the vicinity of a DC grounding electrode according to claim 1, characterized by The expansion mechanism (3) comprises a fixing sleeve (301), a fixing block (305), an extension rod (304), a limiting bolt (302) and a nut, the fixing sleeve (301) is fixedly connected to the fixing ring (8) through the fixing block (305), the fixing sleeve (301) is movably sleeved on the extension rod (304) along the axial direction, the lower end of the extension rod (304) is connected to the lower end of the flexible cover (7), the limiting bolt (302) penetrates through the fixing sleeve (301) along the radial direction of the support ring (1), the nut is sleeved on the limiting bolt (302) and is in threaded connection with the limiting bolt (302), the nut is embedded on the inner wall of the fixing sleeve (301), and the limiting bolt (302) can abut against the side wall of the extension rod (304).

4. The apparatus for processing the anticorrosive coating at the breakage point of the buried pipeline adjacent to the direct current grounding electrode according to claim 1, characterized in that, The outer side wall of the flexible cover (7) is provided with a collapse groove extending along the circumferential direction of the support ring (1), and the cross-sectional shape of the collapse groove is conical.

5. The direct current grounding electrode adjacent buried pipeline breakage point anticorrosive coating processing device according to claim 1, characterized in that, The cross-sectional shape of the chute (406) and the cross-sectional shape of the sliding plate (405) are both rectangular; and / or, The cross-sectional shape of the stirring blade is circular.

6. The apparatus for processing the anticorrosive coating at the breakage point of the buried pipeline adjacent to the direct current grounding electrode according to claim 1, characterized in that, The stirring mechanism (4) further comprises a clamping seat (408) and a clamping block (407), the clamping seat (408) is rotatably arranged below the mounting boss, the lower end of the clamping block (407) is in plug-in connection with the clamping seat (408), and the upper end of the clamping block (407) is connected to the lower end of the stirring mechanism (4).

7. The apparatus for processing a corrosion protective coating on a break in a buried pipeline in the vicinity of a DC earth electrode according to claim 6, characterized by The clamping seat (408) and the clamping block (407) are in rotation-stopping connection.

8. The apparatus for processing the anticorrosive coating at the breakage point of the buried pipeline adjacent to the direct current grounding electrode according to claim 1, characterized in that, The mixing mechanism (5) comprises a mixing rod (501), a transmission rod (502) and a movable rod (503), one end of the mixing rod (501) is connected to the stirring mechanism (4), the other end of the mixing rod (501) extends outward along the radial direction of the support ring (1) and is connected to the upper end of the transmission rod (502), the lower end of the transmission rod (502) extends into the mixing interval and is connected to the movable rod (503).

9. The apparatus for processing the anticorrosive coating at the breakage point of the buried pipeline adjacent to the direct current grounding electrode according to claim 1, characterized in that, The extension rod (409) further comprises a sealing gasket (402) arranged at the upper end of the moving rod (403), and the sealing gasket (402) is arranged between the adjacent stirring rod (401) and the moving rod (403).

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