An active seal plug

Abstract

The application discloses an active sealing plug, belonging to the technical field of oil and gas pipeline maintenance plugs, which comprises a guide mechanism, the guide mechanism comprising an active support and a rotating support, the lower end of the rotating support being provided with a plugging mechanism, the plugging mechanism comprising a first plugging block and a second plugging block, a first sealing ring and an elastic sealing rubber sleeve being arranged in the groove at the outer edge position of the first plugging block, and a third sealing ring being arranged in the groove at the outer edge position of the second plugging block, a plurality of radial pushers being arranged in the cavity formed by the first plugging block and the second plugging block, through the application, after the original sealing ring is damaged, the design of plugging block separation can be adopted, a new sealing ring can be constructed and expanded to form an independent sealing system, and the linkage rigid pressurization can simultaneously reinforce the original damaged sealing ring, so that the double protection of 'new sealing main prevention + old sealing auxiliary' is achieved, the sealing fault tolerance is greatly improved, and the reliability and safety of the oil and gas pipeline plugging are ensured.

Description

TECHNICAL FIELD

[0001] The pipe joint or pipe fitting, more specifically belongs to the technical field of oil and gas pipeline repair plugs, and particularly relates to a positive sealing plugging head. BACKGROUND

[0002] In the oil and gas energy transportation system, long-distance oil and gas pipelines are the core infrastructure connecting energy production sites and consumption terminals. During long-term operation, they are prone to failure due to medium corrosion, external mechanical damage, aging, and other problems. Regular maintenance, overhaul, or pipe replacement operations are needed to ensure safe transportation. The prerequisite for such operations is to cut off the flow of the transmission medium in the pipeline to avoid safety accidents such as medium leakage, explosion, and environmental pollution. Therefore, temporary isolation of the pipeline is achieved through a pretreatment process. First, a tee pipe fitting is precisely welded and fixed outside the target section of the pipeline to be repaired. After the pipe fitting is installed stably, a special opening device is used to open a hole from the flange of the tee pipe fitting into the pipeline. After the opening process is completed and it is confirmed that the opening size matches the subsequent plugging requirements, plugging operation is performed on the oil and gas pipeline at the opening position. The transmission path of the medium in the pipeline is blocked through physical isolation, creating a safe environment without pressure and medium interference for subsequent fault diagnosis, pipeline repair, or replacement operations.

[0003] In the active plugging operation of the oil and gas pipeline, the plug is the core equipment for efficient isolation of the medium, and its sealing performance directly determines the safety and reliability of the entire maintenance and repair operation. The plugging head needs to be moved to the preset plugging position along the inner wall of the pipeline through a guide mechanism (such as a plugging cylinder), adjusted to be horizontal, and made to adhere to the inner wall of the sealing bowl to achieve sealing.

[0004] However, the actual pipeline inner wall environment is complex, often with defects such as welding residual weld beads, hard protrusions formed by corrosion, metal debris deposited by long-term transportation, or sharp edges caused by local deformation. When the sealing bowl moves along the inner wall of the pipeline with the plugging head, its outer surface inevitably rubs, scratches, or even directly hits these sharp protrusions. Since the material of the sealing bowl is usually elastic rubber, it lacks effective protection structure during movement and is easily scratched by sharp parts, resulting in cracks, perforations, and other damages. Currently, the core of existing active plugging technology is to enhance the adhesion of the sealing bowl to the inner wall through a hydraulic system (such as introducing oil through a rubber tube to provide radial force). However, the sealing bowl has already been damaged by scratching during the moving stage. Although subsequent hydraulic driving can make the sealing bowl adhere more closely to the inner wall of the pipeline, sometimes a small amount of high-pressure medium leaks from the damaged part, and effective sealing cannot be formed. SUMMARY

[0005] The technical scheme of the present application provides a solution significantly different from the prior art, and the oil and gas pipeline repair plug belongs to a joint or pipe fitting, and mainly provides an active sealing plug to solve the technical problem that when the sealing plug moves to the preset plugging position, the hydraulic system is relied on to enhance the adhesion of the skin bowl and the inner wall, and an effective seal cannot be formed.

[0006] The present application solves the above technical problems by adopting the following technical scheme:

[0007] An active sealing plug comprises a guide mechanism, the guide mechanism comprises an active support and a rotating support, a rotating shaft is arranged between the active support and the rotating support, a plugging mechanism is arranged at the lower end of the rotating support, the plugging mechanism comprises a first blocking block and a second blocking block, a first annular groove and a second annular groove are arranged at the outer edge position of the first blocking block, a first sealing ring and an elastic sealing rubber sleeve are respectively arranged in the first annular groove and the second annular groove, a limiting groove is arranged at the center position of the first blocking block, a third annular groove and a third sealing ring are arranged at the outer edge position of the second blocking block and in the third annular groove, a threaded limiting block is arranged on the side of the second blocking block close to the first blocking block, the limiting block is matched with the limiting groove, and a pushing block is connected to the limiting block through bolts, a plurality of radial pushing members are arranged in the cavity formed by the first blocking block and the second blocking block, the radial pushing members are distributed at equal intervals and surround the cavity, and the pushing block can push the radial pushing members to move outward along the radial direction of the first blocking block and abut against the inner sides of the first sealing ring, the elastic sealing rubber sleeve and the third sealing ring respectively.

[0008] Preferably, each radial pushing member comprises a main pushing frame, a first auxiliary pushing frame and a second auxiliary pushing frame, the main pushing frame is movably connected with a corresponding through hole in the second annular groove, a main pressing plate is arranged at one end of each main pushing frame close to the elastic sealing rubber sleeve, the main pressing plate is matched with the inner wall of the elastic sealing rubber sleeve, the first auxiliary pushing frame is slidably connected with a corresponding through hole in the first annular groove, a first auxiliary pressing plate is arranged at one end of each first auxiliary pushing frame close to the first sealing ring, the first auxiliary pressing plate is matched with the inner wall of the first sealing ring, the second auxiliary pushing frame is movably connected with a corresponding through hole in the third annular groove, and a second auxiliary pressing plate is arranged at one end of each second auxiliary pushing frame close to the third sealing ring, the second auxiliary pressing plate is matched with the inner wall of the third sealing ring.

[0009] Preferably, a connecting plate, a sliding groove plate and a reset spring are further arranged on each main pushing frame, the connecting plate and the sliding groove plate are connected with the side wall of the main pushing frame through bolts, the reset spring is sleeved on the main pushing frame and one end of the reset spring is in contact with the protruding position on the inner wall of the first blocking block, the connecting plate and the corresponding first auxiliary pushing frame are connected through bolts, and the sliding groove plate and the corresponding second auxiliary pushing frame are connected through sliding.

[0010] Preferably, the end of the main push frame away from the main pressing plate is threadedly connected with an open end cover, and a ball is arranged in the cavity formed by the end cover and the main push frame, and the ball can contact the push block through the opening of the end cover.

[0011] Preferably, the push block comprises a guide portion and a contact portion, and the guide portion and the contact portion are in contact with the ball in sequence.

[0012] Preferably, the first block further comprises a fourth annular groove, and a second sealing ring is arranged in the fourth annular groove, and the second sealing ring is tightly fitted with the inner wall of the second block.

[0013] Preferably, the limiting groove of the first block is provided with a shaft seal, the inner edge of the shaft seal is provided with a threaded column, the threaded column is fitted with the thread inside the limiting block, the outer wall of the first block is connected with a disc motor through bolts, the output end of the disc motor is connected with one end of the threaded column, the disc motor is arranged in the groove at the lower end of the rotating support, and the rotating support and the first block are connected through bolts.

[0014] Preferably, the outer wall of the second block is provided with a contact assembly, the contact assembly comprises a mounting frame, and a plurality of guide wheels with different radii are connected to the mounting frame through shaft rods.

[0015] Preferably, the rotating support is connected with two gland nuts through bolts, and the two gland nuts are pressed on the two ends of the rotating shaft.

[0016] Preferably, the two sides of the lower end of the driving support are provided with supporting blocks, the driving support is connected with an adjusting block through bolts, and the adjusting block is arranged on the side of the driving support close to the rotating support.

[0017] Compared with the prior art, the present application has the following advantages:

[0018] (1) The first block, the second block, the limiting block, the first sealing ring, the elastic sealing rubber sleeve, the third sealing ring, the second sealing ring, the push block, the shaft seal, the threaded column, the disc motor and the radial pushing piece are arranged, so that when the first and third sealing rings are damaged due to the sharp structure of the inner wall of the pipeline, the elastic sealing rubber sleeve in the second annular groove can be quickly exposed by the separation design of the first block and the second block, and the elastic sealing rubber sleeve is actively expanded by the mechanical driving of the radial pushing piece, so that a new sealing system is formed with the inner wall of the pipeline, a active remedial mode of "damage and switching" is achieved, the invalid dependence on the damaged sealing element is avoided, the new sealing system is independent of the original damaged structure, and the leakage path is blocked, so that the leakage is not compensated by the continuous pressure on the original sealing element as in the prior art.

[0019] And the cooperation between the main push frame, the main pressing plate, the connecting plate, the first auxiliary push frame, the first auxiliary pressing plate, the sliding groove plate, the second auxiliary push frame, the second auxiliary pressing plate, the end cover, the ball and the return spring makes the opening of the elastic sealing rubber sleeve be realized through rigid mechanical structure, so that the controllable and uniform force is ensured, the tightness with the inner wall of the pipeline is ensured not to be affected by the medium pressure fluctuation, compared with the existing single sealing piece pressure mode, the fault tolerance and reliability of the sealing system are significantly improved, and the sudden damage problem in the complex inner wall environment is effectively solved.

[0020] (2) The shaft seal, threaded column, limit block, limit groove, push block, main push frame and main pressing plate are arranged, the threaded column is driven to rotate by the disc motor, the push block on the limit block is pushed to act on the radial pusher when the second block is pushed to move, the first auxiliary push frame drives the first negative pressure plate to apply rigid pressure to the first sealing ring, the second auxiliary push frame drives the second negative pressure plate to apply rigid pressure to the third sealing ring, the linkage type pressure is applied, the mechanical transmission rigid pressure mode is adopted, the force transmission is direct and stable, is not affected by the characteristics or leakage of the hydraulic medium, the pressure on the damaged sealing ring is continuously effective, the medium leakage at the damaged position is reduced, compared with the existing technology, the pressure of the sealing ring depends on the hydraulic system (such as the oil pipe), the problem that the oil pressure is easily affected by the oil temperature and leakage is avoided, especially when the original sealing ring is damaged, the hydraulic pressure may be lost through the damaged part, resulting in the attenuation of the pressure effect;

[0021] In addition, the synchronous action on multiple sealing rings builds a new sealing system and "supplement pressure and reinforcement" to the original damaged sealing element, forming "new sealing main defense + old sealing auxiliary" double protection, compared with the existing single hydraulic pressure mode, the sealing redundancy is higher, especially suitable for high pressure and high risk oil and gas pipeline plugging scene, significantly reducing the risk of safety accidents caused by sealing failure.

[0022] The application will be explained in detail below in combination with the drawings and specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the application;

[0024] Figure 2 It is an exploded schematic diagram of the overall structure of the application;

[0025] Figure 3 It is a schematic diagram of the plugging mechanism structure of the application;

[0026] Figure 4 It is an exploded schematic diagram of the plugging structure of the application;

[0027] Figure 5 It is a schematic diagram of the connection between the first block and the sealing ring of the application;

[0028] Figure 6 The second blocking structure schematic diagram of the present application;

[0029] Figure 7 The first blocking internal structure schematic diagram of the present application;

[0030] Figure 8 The first blocking structure schematic diagram of the present application;

[0031] Figure 9 The radial pusher exploded schematic diagram of the present application;

[0032] Figure 10 The pusher block structure schematic diagram of the present application;

[0033] Figure 11 The plugging structure cross section schematic diagram of the present application.

[0034] In the figure: 1, guide mechanism; 11, active support; 12, rotating support; 13, rotating shaft; 14, gland; 15, adjusting block; 16, supporting block; 2, plugging mechanism; 21, first blocking block; 211, first annular groove; 212, second annular groove; 213, fourth annular groove; 214, limiting groove; 22, second blocking block; 221, limiting block; 222, third annular groove; 23, first sealing ring; 24, elastic sealing rubber sleeve; 25, third sealing ring; 26, second sealing ring; 27, pusher block; 271, guide part; 272, abutting part; 28, shaft seal; 29, threaded column; 3, contact assembly; 31, mounting frame; 32, guide wheel; 4, disc motor; 5, radial pusher; 51, main pusher frame; 511, main pressing plate; 52, connecting plate; 53, first auxiliary pusher frame; 531, first auxiliary pressing plate; 54, sliding slot plate; 55, second auxiliary pusher frame; 551, second auxiliary pressing plate; 56, end cover; 57, ball; 58, return spring. DETAILED DESCRIPTION

[0035] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the accompanying drawings, in which several embodiments of the present application are given, but the present application can be realized in different forms and is not limited to the embodiments described in the text, on the contrary, these embodiments are provided to make the disclosed content of the present application more thorough and comprehensive.

[0036] It is to be noted that when an element is referred to as being "on" another element, it can be directly on the other element or intervening elements can also be present therebetween, and when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements can also be present therebetween. The terms "vertical", "horizontal", "left", "right" and similar expressions as used herein are for illustrative purposes only.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. All publications, patent applications, patents, and other references mentioned herein are incorporated by reference in their entirety.

[0038] Embodiment one, please refer to the accompanying drawings Figures 1-11 As shown in the drawings, an active sealing plug includes a guide mechanism 1, the guide mechanism 1 includes an active support 11 and a rotating support 12, a rotating shaft 13 is arranged between the active support 11 and the rotating support 12, a lower end of the rotating support 12 is provided with a plugging mechanism 2, the plugging mechanism 2 includes a first blocking block 21 and a second blocking block 22, a first annular groove 211 and a second annular groove 212 are arranged at an outer edge position of the first blocking block 21, a first sealing ring 23 and an elastic sealing rubber sleeve 24 are respectively arranged in the first annular groove 211 and the second annular groove 212, a limiting groove 214 is arranged at a center position of the first blocking block 21, a third annular groove 222 and a third sealing ring 25 arranged in the third annular groove 222 are arranged at an outer edge position of the second blocking block 22, a limiting block 221 with threads is arranged at a side of the second blocking block 22 close to the first blocking block 21, the limiting block 221 is matched with the limiting groove 214, the limiting block 221 is connected with a pushing block 27 through bolts, a plurality of radial pushing members 5 are arranged in a cavity formed by the first blocking block 21 and the second blocking block 22, the radial pushing members 5 are distributed in equal intervals and surround the cavity, the pushing block 27 can push the radial pushing members 5 to move outward along a radial direction of the first blocking block 21, and the radial pushing members 5 respectively abut against inner sides of the first sealing ring 23, the elastic sealing rubber sleeve 24 and the third sealing ring 25, the first sealing ring 23 and the third sealing ring 25 have the same diameter, the diameter of the elastic sealing rubber sleeve 24 is smaller than that of the first sealing ring 23 or the third sealing ring 25, so the thickness of the elastic sealing rubber sleeve 24 is much greater than that of the first sealing ring 23 or the third sealing ring 25, so as to ensure that the elastic sealing rubber sleeve 24 has good sealing performance after being stably expanded.

[0039] The above structure has double core advantages: one is that the new sealing ring is exposed and the independent sealing system is formed by the separation of the block, which can actively remedy the damage of the original sealing ring, and compared with the existing single sealing and pressurizing method, the sealing fault tolerance is greatly improved; the other is that the rigid pressurizing can simultaneously reinforce the old damaged sealing ring, which is more stable than hydraulic pressurizing, and a double protection of "new sealing main defense + old sealing auxiliary" is constructed, which significantly improves the reliability and safety of oil and gas pipeline plugging.

[0040] The specific operation is as follows: in the oil and gas pipeline plugging operation, the tee pipe is first installed in the target section of the pipeline to be repaired, and the opening is completed from the flange opening, then the plugging head is hoisted, the output end of the plugging cylinder (existing equipment, not shown in the figure) is connected with the active support 11, the plugging head is pushed into the pipeline by the output end of the plugging cylinder, and the guide wheel 32 in the contact assembly 3 rolls on the inner wall of the pipeline to guide until the support block 16 contacts with the pipe bottom to form stable support, so that the plugging mechanism 2 deflects, is perpendicular to the cross section of the pipeline, and is naturally in interference fit with the pipeline;

[0041] If the sharp part of the inner wall of the pipeline scratches the first sealing ring 23 or the third sealing ring 25, the disc motor 4 is then turned on, the disc motor 4 drives the threaded column 29 to rotate, and the limiting block 221 cooperating with the threaded column 29 is constrained in the limiting groove 214, so that the second block 22 moves along the direction of the pipeline, that is, the first block 21 and the second block 22 are separated, the elastic sealing rubber sleeve 24 in the second annular groove 212 is exposed, and during the separation process, the second sealing ring 26 and the inner wall of the second block 22 are kept in close fit, at the same time, the pushing block 27 on the limiting block 221 gradually approaches the ball 57 in the radial pushing piece 5, the ball 57 contacts the guide part 271 and the abutting part 272 of the pushing block 27 in turn, by using the curved surface structure of the side wall of the pushing block 27, a radial force is gradually provided to the radial pushing piece 5, so that each main pushing frame 51 provides an outward (toward the inner wall of the pipeline) force to each part of the elastic sealing rubber sleeve 24 through the main pressing plate 511, the reset spring 58 is compressed, the elastic sealing rubber sleeve 24 is expanded, the elastic sealing rubber sleeve 24 is in interference fit with the inner wall of the pipeline, a new sealing system is constructed, at the same time, each first auxiliary pushing frame 53 drives the first negative pressure plate to pressurize each part of the first sealing ring 23, and each second auxiliary pushing frame 55 drives the second negative pressure plate to pressurize each part of the third sealing ring 25, so as to reduce the leakage at the damaged position and further improve the sealing performance, and when the ball 57 contacts the abutting part 272 of the pushing block 27, the disc motor 4 stops rotating, the pushing block 27 is stationary, at this time, the force applied to the sealing ring is maximum, and the second sealing ring 26 coincides with the edge of the opening side of the second block 22.

[0042] In the embodiment two, please refer to the accompanying drawings Figures 2-5As shown, the first block 21 is further provided with a fourth annular groove 213, the second sealing ring 26 is arranged in the fourth annular groove 213, and the second sealing ring 26 is tightly matched with the inner wall of the second block 22. During the process of separating the two blocks to expose the elastic sealing rubber sleeve 24, the second sealing ring 26 is always attached to the inner wall of the opening side of the second block 22, so that the medium is prevented from entering from the connection between the two blocks during the movement of the block. The shaft seal 28 is arranged in the limiting groove of the first block 21, the threaded column 29 is arranged on the inner edge of the shaft seal 28, and the threaded column 29 is matched with the thread in the limiting block 221. The disc motor 4 is connected to one side of the outer wall of the first block 21 through a bolt, the output end of the disc motor 4 is connected to one end of the threaded column 29, and the disc motor 4 is located in the groove at the lower end of the rotating support 12. The rotating support 12 and the first block 21 are connected through a bolt. Through the cooperation between the disc motor 4, the threaded column 29 and the limiting block 221, driving force is provided for the movement of the second block 22. The outer wall of the second block 22 is provided with a contact assembly 3, the contact assembly 3 comprises a mounting frame 31, and a plurality of guide wheels 32 with different radii are connected to the mounting frame 31 through shaft rods. Through the contact assembly 3, when the plugging mechanism 2 contacts the bottom of the pipeline, the plugging mechanism 2 is assisted to turn and is perpendicular to the pipeline section.

[0043] The rotating support 12 is connected with two pressure covers 14 through bolts, and the two pressure covers 14 are pressed on both ends of the rotating shaft 13. The pressure cover 14 limits the rotating shaft 13, ensures the stable hinging between the rotating support 12 and the driving support 11, and the supporting blocks 16 are arranged on both sides of the lower end of the driving support 11. The driving support 11 is connected with the adjusting block 15 through a bolt, and the adjusting block 15 is located on the side of the driving support 11 close to the rotating support 12. Through the cooperation between the supporting block 16 and the adjusting block 15, the maximum range of the rotating amplitude of the rotating support 12 is regulated.

[0044] Embodiment three, please refer to the attached Figures 8-11As shown, each of the radial pushers 5 comprises a main pusher 51, a first secondary pusher 53 and a second secondary pusher 55, the main pusher 51 is movably connected with a corresponding through hole in the second annular groove 212, each of the main pushers 51 is provided with a main pressing plate 511 at one end close to the elastic sealing rubber sleeve 24, the main pressing plate 511 is matched with the inner wall of the elastic sealing rubber sleeve 24, the first secondary pusher 53 is slidably connected with a corresponding through hole in the first annular groove 211, each of the first secondary pushers 53 is provided with a first secondary pressing plate 531 at one end close to the first sealing ring 23, the first secondary pressing plate 531 is matched with the inner wall of the first sealing ring 23, the second secondary pusher 55 is movably connected with a corresponding through hole in the third annular groove 222, each of the second secondary pushers 55 is provided with a second secondary pressing plate 551 at one end close to the third sealing ring 25, the second secondary pressing plate 551 is matched with the inner wall of the third sealing ring 25, each of the main pushers 51 is further provided with a connecting plate 52, a sliding groove plate 54 and a reset spring 58, the connecting plate 52 and the sliding groove plate 54 are connected with the side wall of the main pusher 51 through bolts, the reset spring 58 is sleeved on the main pusher 51 and one end thereof is in contact with the protruding position on the inner wall of the first plug 21, the connecting plate 52 and the corresponding first secondary pusher 53 are connected through bolts, the sliding groove plate 54 and the corresponding second secondary pusher 55 are connected through sliding, through the mutual cooperation between the main pusher 51, the main pressing plate 511, the first secondary pusher 53, the first secondary pressing plate 531, the second secondary pusher 55 and the second secondary pressing plate 551, the connecting plate 52 and the sliding groove plate 54, the first sealing ring 23, the third sealing ring 25 and the elastic sealing rubber sleeve 24 can be uniformly and rigidly expanded during the separation of the second plug 22 and the first plug 21, and the stability of the sealing is improved.

[0045] One end of each of the main pushers 51 away from the main pressing plate 511 is threadedly connected with an end cover 56 with an opening, a cavity formed by the end cover 56 and the main pusher 51 is provided with a ball 57, the ball 57 can contact the push block 27 through the opening on the end cover 56, the push block 27 comprises a guide portion 271 and an abutting portion 272, and the guide portion 271 and the abutting portion 272 are in turn in contact with the ball 57, through the mutual cooperation between the curved surface structures of the ball 57, the end cover 56 and the push block 27, the axial force is adjusted to be radial force, and the conditions of separating the two plugs and radially pressing the elastic sealing rubber sleeve 24 are met.

[0046] The application is described above by way of example with reference to the drawings, and it is obvious that the specific implementation of the application is not limited by the above-mentioned manner, as long as the method concept and technical solution of the application are adopted for such non-essential improvement, or the concept and technical solution of the application are directly applied to other occasions without improvement, which are all within the protection scope of the application.

Claims

1. An active sealing plug, comprising a guide mechanism (1), the guide mechanism (1) comprising an active support (11) and a rotating support (12), a rotating shaft (13) being disposed between the active support (11) and the rotating support (12), and a plugging mechanism (2) being disposed at the lower end of the rotating support (12), characterized in that, The sealing mechanism (2) includes a first blocking block (21) and a second blocking block (22). The outer edge of the first blocking block (21) is provided with a first annular groove (211) and a second annular groove (212). A first sealing ring (23) and an elastic sealing sleeve (24) are respectively provided in the first annular groove (211) and the second annular groove (212). A limiting groove (214) is provided at the center of the first blocking block (21). The outer edge of the second blocking block (22) is provided with a third annular groove (222) and a third sealing ring (25) is provided in the third annular groove (222). (22) A threaded limiting block (221) is provided on one side near the first blocking block (21). The limiting block (221) cooperates with the limiting groove (214). The limiting block (221) is connected to a pushing block (27) by bolts. Multiple radial pushing members (5) are provided in the cavity formed by the first blocking block (21) and the second blocking block (22). The radial pushing members (5) are distributed in a circle at equal intervals. The pushing block (27) can push the radial pushing members (5) to move outward along the radial direction of the first blocking block (21) and abut against the inner side of the first sealing ring (23), the elastic sealing sleeve (24) and the third sealing ring (25) respectively. Each of the radial pushers (5) includes a main pusher (51), a first auxiliary pusher (53), and a second auxiliary pusher (55). The main pusher (51) is movably connected to the corresponding through hole in the second annular groove (212). Each main pusher (51) is provided with a main pressure plate (511) at one end near the elastic sealing sleeve (24). The main pressure plate (511) cooperates with the inner wall of the elastic sealing sleeve (24). The first auxiliary pusher (53) is slidably connected to the corresponding through hole in the first annular groove (211). Next, each of the first auxiliary pushers (53) is provided with a first auxiliary pressure plate (531) at one end near the first sealing ring (23). The first auxiliary pressure plate (531) cooperates with the inner wall of the first sealing ring (23). The second auxiliary pusher (55) is movably connected to the corresponding through hole in the third annular groove (222). Each of the second auxiliary pushers (55) is provided with a second auxiliary pressure plate (551) at one end near the third sealing ring (25). The second auxiliary pressure plate (551) cooperates with the inner wall of the third sealing ring (25). Each of the main push frames (51) is also provided with a connecting plate (52), a sliding plate (54), and a return spring (58). The connecting plate (52) and the sliding plate (54) are both connected to the side wall of the main push frame (51) by bolts. The return spring (58) is sleeved on the main push frame (51) and one end contacts the protrusion on the inner wall of the first block (21). The connecting plate (52) is bolted to the corresponding first auxiliary push frame (53), and the sliding plate (54) is slidably connected to the corresponding second auxiliary push frame (55). Each of the main pushers (51) has an end cap (56) with an opening threaded to one end away from the main pressure plate (511). A ball (57) is provided in the cavity formed by the end cap (56) and the main pusher (51). The ball (57) can contact the pusher block (27) through the opening on the end cap (56).

2. The active sealing plug head according to claim 1, characterized in that, The push block (27) includes a guide part (271) and a contact part (272), and the guide part (271) and the contact part (272) contact the ball (57) one after the other.

3. The active sealing plug head according to claim 1, characterized in that, The first block (21) is also provided with a fourth annular groove (213), and a second sealing ring (26) is provided in the fourth annular groove (213), and the second sealing ring (26) is tightly fitted with the inner wall of the second block (22).

4. The active sealing plug head according to claim 3, characterized in that, A shaft seal (28) is provided in the limiting groove of the first block (21). A threaded post (29) is provided on the inner edge of the shaft seal (28), and the threaded post (29) is threaded with the inside of the limiting block (221). A disc motor (4) is bolted to one side of the outer wall of the first block (21). The output end of the disc motor (4) is connected to one end of the threaded post (29), and the disc motor (4) is located in the groove at the lower end of the rotating bracket (12). The rotating bracket (12) and the first block (21) are bolted together.

5. The active sealing plug head according to claim 3, characterized in that, The second block (22) has a contact assembly (3) on one side of its outer wall. The contact assembly (3) includes a mounting bracket (31), which is connected to a plurality of guide wheels (32) with different radii via a shaft.

6. The active sealing plug head according to claim 4, characterized in that, The rotating bracket (12) is connected by bolts to two pressure caps (14), and the two pressure caps (14) press on both ends of the rotating shaft (13) respectively.

7. The active sealing plug head according to claim 1, characterized in that, Support blocks (16) are provided on both sides of the lower end of the active support (11). The active support (11) is connected to an adjustment block (15) by bolts, and the adjustment block (15) is located on the side of the active support (11) close to the rotating support (12).

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