A gasbag plugging device for trenchless pipeline rehabilitation

Abstract

The application discloses a gas bag blocking device for pipeline trenchless repair, and relates to the technical field of pipeline trenchless repair.The device comprises a moving mechanism for traction in a pipeline, a gas bag mechanism for providing expansion power is installed on the moving mechanism, a blocking mechanism is externally sleeved on the gas bag mechanism for expansion under the drive of the gas bag mechanism to block pipeline defects, a lock control mechanism is installed on the moving mechanism for controlling the locking and unlocking of the blocking mechanism, the gas bag mechanism comprises a main gas bag coaxially sleeved in the middle section of a support shaft and auxiliary gas bags symmetrically sleeved at both ends of the support shaft.The device has the advantages that: the device realizes accurate control and fault-tolerant adjustment of the repair process, improves the success rate of construction and the quality of repair through the dynamic deviation correction and reversible locking mechanism of multiple mechanisms, and the flared double-sealing structure not only strengthens the reliability of end sealing, but also improves the local hydraulic conditions through the streamlined transition, effectively improving the long-term durability and stability of the repair body.

Description

Technical Field

[0001] This invention relates to the field of trenchless pipeline repair technology, and in particular to an airbag sealing device for trenchless pipeline repair. Background Technology

[0002] Among various trenchless pipeline repair technologies, the use of inflatable metal sleeves for localized sealing and reinforcement of the pipeline interior is a widely applied and technologically mature process. This process typically involves delivering a pre-rolled stainless steel sleeve with a rubber sealing ring to the pipeline defect. An inflatable bladder then expands the sleeve radially to ensure a tight fit against the inner wall of the old pipeline, thereby achieving rapid repair of leaks or structural weaknesses.

[0003] Existing devices typically employ a single airbag drive. Slight variations in airbag wall thickness and material elasticity during manufacturing result in different radial expansion rates during inflation. While this allows for roughly uniform expansion force circumferentially, it fails to provide real-time, proactive adjustment of the sleeve's posture when the internal pipe environment exhibits ellipticity or localized depressions. Furthermore, the expansion of the sleeve by the existing airbag is a unidirectional, irreversible plastic deformation process. If, during inflation, foreign objects within the pipe, inaccurate positioning, or uneven pressure cause the sleeve to tilt or fail to fully adhere, no shrinkage adjustment or retraction can be performed, making the success rate highly dependent on the operator's experience. Finally, the ends of existing repair sleeves are usually designed as flat openings, forming linear contact with the inner wall of the old pipe. Under long-term internal and external water pressure, soil stress, and continuous water erosion, this contact area is prone to stress concentration, leading to fatigue, curling, or even peeling of the sealing rubber, thus causing "end leakage" and becoming a major cause of long-term seal failure in the repair.

[0004] Therefore, in order to achieve precise control of the repair process and improve the sealing performance after repair, this invention provides an airbag sealing device for trenchless pipeline repair. Summary of the Invention

[0005] The purpose of this invention is to solve the problems existing in the prior art by proposing an airbag sealing device for trenchless pipeline repair.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: an airbag sealing device for trenchless pipeline repair, comprising a moving mechanism for traction within the pipeline, an airbag mechanism for providing expansion power installed on the moving mechanism, a sealing mechanism for sealing pipeline defects after expansion being sleeved outside the airbag mechanism, and a locking mechanism installed on the moving mechanism for controlling the locking and unlocking of the sealing mechanism.

[0007] The moving mechanism includes a support shaft, and the airbag mechanism includes a main airbag coaxially sleeved in the middle section of the support shaft and auxiliary airbags symmetrically sleeved at both ends of the support shaft. The air paths of the main airbag and the two auxiliary airbags are independently controlled.

[0008] The sealing mechanism includes a telescopic cuff fitted around the outside of the main airbag and the auxiliary airbag. The telescopic cuff includes a cuff body and multiple extended arc ribs fixed at both ends of the cuff body, which together form a double sealing structure. Two locking mechanisms are symmetrically arranged on the telescopic cuff for locking the telescopic cuff after it has changed shape.

[0009] During closure, the main airbag and auxiliary airbag drive the closure mechanism to expand and dynamically level in coordination; the auxiliary airbag drives the locking mechanism to release the self-locking of the closure mechanism before closure and restore the self-locking of the closure mechanism after closure is completed.

[0010] In the above-mentioned airbag sealing device for trenchless pipeline repair, the moving mechanism includes two end moving frames symmetrically distributed on the left and right, and a support shaft is fixedly connected between the two end moving frames.

[0011] In the above-mentioned airbag sealing device for trenchless pipeline repair, the main body of the ferrule is made of rolled metal sheet. The cross-section of the main body of the ferrule is an open ring with an axially open seam, and the two sides of the open seam overlap to form an overlapping joint. Multiple extended arc ribs together form a flared structure. The outer walls of the main body of the ferrule and the extended arc ribs are covered with a rubber sleeve.

[0012] In the above-mentioned airbag sealing device for trenchless pipeline repair, the locking mechanism is located inside the overlapping joint of the main body of the hoop and is used to engage and lock the overlapping joint.

[0013] In the above-mentioned airbag sealing device for trenchless pipeline repair, the locking mechanism includes a housing fixedly connected to the main body of the ferrule and a self-locking component disposed therein. The self-locking component includes a Z-shaped lever rotatably disposed on the housing. The first end of the Z-shaped lever is connected to the main body of the ferrule by a spring. The bottom wall of the first end is provided with a protrusion one, and the second end is provided with a tooth block one and a tooth block two that mesh with the two sides of the overlapping joint.

[0014] In the above-mentioned airbag sealing device for trenchless pipeline repair, the locking mechanism and the locking mechanism are arranged in a one-to-one correspondence. The locking mechanism includes a push plate that is slidably connected to the support shaft and an upper and lower adaptation unit set on the support shaft. The push plate is located between the auxiliary airbag and the locking mechanism on the corresponding side, and the upper and lower adaptation unit is detachably connected to the corresponding locking mechanism.

[0015] In the above-mentioned airbag sealing device for trenchless pipeline repair, the upper and lower adaptation unit includes a movable column that is slidably connected to the support shaft, and a slider that is slidably connected to the movable column. The slider is provided with a second protrusion. The movable column is engaged with the docking groove on the housing of the locking mechanism through the docking rail.

[0016] In the above-mentioned airbag sealing device for trenchless pipeline repair, the auxiliary airbag expands to drive the push plate to move, which in turn pushes the protrusion of the self-locking component through the slider and the second protrusion, causing the Z-shaped lever of the self-locking component to rotate, thereby causing the first tooth block and the second tooth block to disengage from the overlapping joint, thus achieving unlocking.

[0017] In the aforementioned airbag plugging device for trenchless pipeline repair, when the device is pulled into the pipeline, the mating rail and the mating groove cooperate to transmit tension to drive the plugging mechanism to move; when the device is pulled out of the pipeline in the opposite direction, the movable column slides away along the mating groove.

[0018] In the above-mentioned airbag sealing device for trenchless pipeline repair, two limiting rings are also provided on the support shaft. The two limiting rings are located on the outside of the two auxiliary airbags respectively, and are used to axially limit the auxiliary airbags together with the corresponding locking mechanism.

[0019] Compared with existing technologies, the advantages of this invention are as follows: the device achieves precise control and fault-tolerant adjustment of the repair process through a multi-mechanism collaborative dynamic correction and reversible locking mechanism, which significantly improves the success rate of construction and the quality of repair; at the same time, its flared double sealing structure not only strengthens the reliability of the end seal, but also improves the local hydraulic conditions through streamlined transition, effectively improving the long-term durability and stability of the repair body.

[0020] 1. Through the coordinated use of the airbag mechanism, sealing mechanism, and locking mechanism, dynamic correction and precise control of the repair process are achieved, greatly improving repair quality and significantly reducing material scrap and rework rates caused by installation errors. Specifically: Process controllability: The pressure of the two auxiliary airbags can be independently adjusted, creating a pressure difference in real time during expansion to "dynamically level" the axial tilt of the cylinder body, ensuring uniform fit. Result reversibility: Even if a leak is found after initial locking, the locking mechanism can be unlocked by a secondary action of the auxiliary airbags, causing the sealing mechanism to contract, thus allowing for secondary adjustment and relocking of position or orientation.

[0021] 2. A double-sealing structure is formed by the combination of the main body of the clamp and the extended arc ribs. The flared extended arc ribs transform the original "abrupt right-angle contact" into a "gradual inclined surface pressing contact," and the streamlined transition helps reduce turbulence and scouring. The cylindrical surface of the clamp body forms the main sealing surface with the inner wall of the pipe. At the joint end between the clamp body and the inner wall of the old pipe, the flared inclined surface of the extended arc ribs compacts the inner wall of the pipe with a larger contact area, forming a second sealing surface. In the repaired pipe, the flared end provides a smooth inlet and outlet when water flows through the repaired section. The reduction of turbulence means a weakening of the long-term hydraulic scouring effect on the ends of the repair and the sealing material, which is beneficial to the long-term stability of the repair. Attached Figure Description

[0022] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings, wherein:

[0023] Figure 1 This is a schematic diagram of a partial cross-section of the overall structure;

[0024] Figure 2 This is a schematic diagram of the overall structure;

[0025] Figure 3 This is a schematic diagram of the telescopic collar structure;

[0026] Figure 4 A structural diagram of the locking mechanism and the upper and lower adaptation units;

[0027] Figure 5 This is a schematic diagram of the locking mechanism;

[0028] Figure 6 This is a structural schematic diagram of the main body of the collar and the rubber sleeve.

[0029] Figure 7 for Figure 6 Enlarged structural diagram at point A;

[0030] Figure 8 This is a schematic diagram of the structure when toothed block one and toothed block two lock the main body of the cylinder hoop.

[0031] Figure 9 This is a structural diagram showing the hoop body when it is unlocked.

[0032] In the diagram: 1. Moving mechanism; 11. End moving frame; 12. Support shaft; 13. Limiting ring; 2. Airbag mechanism; 21. Main airbag; 22. Auxiliary airbag; 3. Sealing mechanism; 31. Telescopic cuff; 311. Cuff body; 312. Extending arc rib; 32. Locking mechanism; 321. Housing; 322. Docking groove; 323. Groove; 324. Self-locking component; 325. Protrusion one; 326. Tooth block one; 327. Tooth block two; 33. Rubber sleeve; 4. Locking control mechanism; 41. Push plate; 42. Upper and lower adaptation unit; 421. Movable column; 422. Docking rail; 423. Slider; 424. Protrusion two. Detailed Implementation

[0033] 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.

[0034] Reference Figure 1 An airbag sealing device for trenchless pipeline repair includes a moving mechanism 1, which includes two end moving frames 11 symmetrically distributed on the left and right, and a support shaft 12 is fixedly connected between the two end moving frames 11.

[0035] Reference Figures 1 to 3 An airbag mechanism 2 is provided on the support shaft 12. The airbag mechanism 2 includes a main airbag 21 sleeved and installed in the middle of the support shaft 12 and an auxiliary airbag 22 sleeved and installed at both ends of the support shaft 12. Both the main airbag 21 and the auxiliary airbag 22 are annular.

[0036] Reference Figures 1 to 3 The airbag mechanism 2 is equipped with a sealing mechanism 3. The sealing mechanism 3 includes a telescopic clamp 31 that can adapt to the inner diameter of the pipe to be repaired and expand and shrink. The telescopic clamp 31 is set on the main airbag 21 and the auxiliary airbag 22. Two locking mechanisms 32 are symmetrically arranged on the telescopic clamp 31 for locking the telescopic clamp 31 after the change. A rubber sleeve 33 is sleeved on the outer wall of the telescopic clamp 31.

[0037] Reference Figure 1 The support shaft 12 is provided with a left and right distributed locking mechanism 4, which corresponds to the locking mechanism 32. The two locking mechanisms 4 limit the main airbag 21. The side wall of the support shaft 12 is detachably installed with two left and right symmetrically distributed limiting rings 13. The limiting rings 13 on the same side and the locking mechanism 4 together limit the auxiliary airbag 22.

[0038] This device is suitable for pipeline repair projects where ground conditions are complex and excavation is not feasible. The specific construction process includes: the first stage (preliminary investigation and preparation), the second stage (pipeline pretreatment and placement of the sealing mechanism 3), the third stage (inflation of the airbag mechanism 2 and installation of the sealing mechanism 3), and the fourth stage (post-repair inspection and completion).

[0039] During the preliminary investigation and preparation: open the two inspection wells near the pipeline to be repaired, use a pipeline inspection robot (existing equipment, not shown in the figure) to enter the inspection wells, and remotely move it to the location of the pipeline to be repaired. Perform a comprehensive endoscopic inspection of the pipeline, and accurately record the location, type, size and severity of defects (cracks, misaligned joints, corrosion holes, etc.); confirm the inner diameter, material and siltation of the pipeline, and determine whether the device is suitable.

[0040] When the pipeline pretreatment and plugging mechanism 3 is in place: Use a high-pressure water jet cleaning vehicle (existing equipment, not shown in the figure) to thoroughly clean the pipeline within a range of at least 1 to 2 meters before and after the repair point, removing silt, scale, and obstacles to ensure that the installation surface is free of impurities. Connect this device to the pipeline inspection robot cart using a pull rod (not shown in the figure) for remote traction and positioning. Move this device to the defect location inside the pipeline by being pulled by the pipeline inspection robot cart.

[0041] When the airbag mechanism 2 expands and the sealing mechanism 3 is installed: the operator takes pictures through the pipeline inspection robot and continuously monitors the real-time picture, controls the airbag mechanism 2 to expand, and drives the sealing mechanism 3 to expand so that it completely covers the defect area. The locking mechanism 4 cooperates to unlock and lock.

[0042] During post-repair inspection and finalization: After the airbag mechanism 2 retracts and resets, the pipeline inspection robot trolley is used again to conduct a comprehensive inspection of the installed sealing mechanism 3. This ensures that the sealing mechanism 3 completely covers the defect and is correctly positioned, that the sealing mechanism 3 is in tight contact with the inner wall of the pipeline throughout the entire process, and that both ends of the sealing mechanism 3 are firmly pressed.

[0043] It should be noted that in this device, the right end moving frame 11 of this device is connected to the pipeline inspection robot trolley by a pull rod. The pipeline inspection robot trolley pulls this device to the right to the defect position in the pipeline. The left end moving frame 11 of this device is connected by a traction rope (not shown in the figure), and the other end of the traction rope is left on the ground to facilitate subsequent leftward pulling and retraction operations.

[0044] It is important to note that both the main airbag 21 and the auxiliary airbags 22 are connected to an independent external air pump via inflation tubes. The main airbag 21 and the two auxiliary airbags 22 are controlled separately, ensuring that the two auxiliary airbags 22 expand and contract synchronously. During the process of pushing the sealing mechanism 3 to the repair position, a small amount of gas is inflated into both the main airbag 21 and the auxiliary airbags 22, keeping the sealing mechanism 3 "suspended" and centered within the pipeline, reducing friction and impact with the pipeline wall, and laying a better foundation for subsequent uniform expansion.

[0045] Reference Figure 1 , Figure 2 , Figure 3 , Figure 6 and Figure 7 The telescopic clamp 31 includes a clamp body 311, which is made of rolled metal sheet. The clamp body 311 has an open slit extending axially in the circumferential direction, making the cross-section an open ring. The first side edge and the second side edge of the open slit partially overlap in the circumferential direction to form an overlapping joint. The first side edge is located radially outside the second side edge. The radial inner walls of both the first and second side edges are provided with racks corresponding to the locking mechanism 32. Multiple extending arc ribs 312 are welded and fixedly connected to the left and right ends of the clamp body 311, and the multiple extending arc ribs 312 form a flared shape.

[0046] It should be noted that the main body 311 of the hoop in this invention has high resilience within the working pressure range, and is made of materials such as high-elasticity stainless steel (e.g., hardened 301 or 304H, or special spring stainless steel). It is manufactured using a plate rolling machine.

[0047] Reference Figure 1 , Figure 4 , Figure 5 , Figure 6 and Figure 7 The overlapping joint is locked by a locking mechanism 32. The locking mechanism 32 includes a housing 321 fixedly connected to the inner wall of the main body 311 of the hoop. Both the front and rear sides of the housing 321 have mating grooves 322. The housing 321 is in the shape of a U-shaped frame. A self-locking component 324 is provided inside the housing 321. The self-locking component 324 includes a shaft rotatably connected to the inner wall of the housing 321 and a Z-shaped lever fixed to the shaft. A spring is connected between the top wall of the first end of the Z-shaped lever and the main body 311 of the hoop. A protrusion 325 is fixedly connected to the bottom wall of this end. A toothed block 326 and a toothed block 327 are fixedly connected to the top wall of the second end of the Z-shaped lever. The toothed block 326 corresponds to the rack on the second side edge, and the toothed block 327 corresponds to the rack on the first side edge. A groove is provided on the second side edge for the toothed block 327 to pass through.

[0048] Reference Figure 1 and Figure 4The locking mechanism 4 includes a push plate 41 and an upper and lower adaptation unit 42. The push plate 41 and the support shaft 12 are slidably connected left and right by a spring (not shown in the figure). The upper and lower adaptation unit 42 includes a movable column 421 that is slidably connected up and down to the support shaft 12 by a spring (not shown in the figure). The top wall of the movable column 421 is provided with a docking rail 422 that is adapted to the docking groove 322 for connecting the housing 321 and the movable column 421. A slider 423 is slidably connected left and right by a spring (not shown in the figure) on the side of the movable column 421 near the push plate 41. A second protrusion 424 is fixedly connected to the top wall of the slider 423. A slot 323 is provided on the left side wall of the housing 321 for the second protrusion 424 to move left and right through.

[0049] The bottom wall of housing 321 is at the same initial height as the bottom wall of protrusion 325. The Z-shaped lever remains stable and horizontal. Tooth block 326 and tooth block 327 mesh with the rack on the second side edge and the rack on the first side edge, respectively, to lock the overlapping part of the barrel hoop body 311.

[0050] Furthermore, the housing 321 is connected to the movable column 421, specifically: the mating grooves 322 on the left and right sides of the housing 321 (i.e., the side closer to the traction rope and the side further away from the pull rod) are as follows: Figure 4 As shown, the docking groove 322 does not penetrate the right side wall of the main body 311 of the cylinder hoop. The corresponding docking rail 422 is adapted to the docking groove 322, so that the shell 321 on the left side and the movable column 421 are in a locked state that can only slide to the left. When the initial pull rod pulls the end moving frame 11 and the support shaft 12 to move to the right and enter the pipeline, the movable column 421 drives the sealing mechanism 3 to move as a whole. When the end moving frame 11 and the support shaft 12 are pulled to the left to exit the pipeline by the traction rope, the movable column 421 can slide to the left and directly disengage, which facilitates the exit of the moving mechanism 1, the airbag mechanism 2 and the locking mechanism 4.

[0051] The specific operation of the airbag mechanism 2 expansion and sealing mechanism 3 during installation is as follows: First, compressed air is slowly and evenly injected into the two auxiliary airbags 22. The expansion of the auxiliary airbags 22 pushes the corresponding push plate 41 to slide closer to the moving column 421, and the spring connecting the push plate 41 and the support shaft 12 is gradually compressed.

[0052] It should be noted that the auxiliary airbag 22 is initially not in contact with the extension arc rib 312, but in contact with the push plate 41. Therefore, after inflation, it first pushes the push plate 41 to move. After the auxiliary airbag 22 pushes the push plate 41 to move, it expands until it is in contact with the extension arc rib 312.

[0053] Push plate 41 pushes slider 423 to slide closer to movable column 421. The spring connecting slider 423 and movable column 421 is gradually compressed, causing protrusion 2 424 to move closer to protrusion 1 325. Protrusion 2 424 pushes protrusion 1 325, and the spring connecting self-locking part 324 and cylinder hoop body 311 is gradually compressed. One end of the Z-shaped lever rises and the other end falls. The end with toothed block 1 326 and toothed block 2 327 fixed falls (see reference). Figure 8 and Figure 9 ), tooth block 326 and tooth block 327 disengage from the rack on the second side edge and the rack on the first side edge respectively, releasing the lock on the overlapping joint of the hoop body 311.

[0054] After releasing the lock at the overlapping joint of the main body 311, compressed air is slowly and evenly injected into the main airbag 21 and the auxiliary airbag 22 simultaneously. The expansion of the main airbag 21 pushes the main body 311 to expand radially outward, while the auxiliary airbag 22 provides internal support for the extended arc rib 312. The expansion of the main body 311 and the extended arc rib 312 of the rubber sleeve 33 causes deformation. During this process, if the main body 311 is found to be offset in the direction of the pipeline axis, it can be adjusted and corrected in time by adjusting the inflation volume and pressure of the main airbag 21 and the auxiliary airbag 22.

[0055] The system locks in place once the main body 311 and the rubber sleeve 33 completely cover the defect area. The cylindrical surface of the main body 311 forms the primary sealing surface with the inner wall of the pipe. At the joint end between the main body 311 and the inner wall of the old pipe, the flared bevel of the extended arc rib 312 compacts the inner wall of the pipe with a larger contact area, forming a second sealing surface. The flared extended arc rib 312 transforms the original "abrupt right-angle contact" into a "progressive beveled pressing contact," which is beneficial to the long-term stability of the repair.

[0056] The specific locking operation is as follows: the gas in the two auxiliary airbags 22 is released, at which point the main airbag 21 stops inflating and maintains pressure. The auxiliary airbags 22 contract until they no longer press against the push plate 41, the push plate 41 moves to the left to reset, the slider 423 and the second protrusion 424 move to the left to reset, the first protrusion 325 is no longer pressed, the Z-shaped lever returns to a stable horizontal state, the first toothed block 326 and the second toothed block 327 mesh with the rack on the second side edge and the rack on the first side edge, and the overlapping joint of the main body 311 is locked again.

[0057] If insufficient expansion is found at the right end of the main body 311 during the expansion and repair process, the pressure of the right auxiliary airbag 22 can be increased, or the pressure of the left auxiliary airbag 22 can be released to achieve dynamic leveling using the pressure difference. Even if slight misalignment or poor sealing is found after final locking, mechanical unlocking can be achieved by contracting the auxiliary airbags 22 on both sides, and then the position or posture can be readjusted, and inflation and locking can be performed again. This facilitates dynamic correction and precise control during the repair process, greatly improving repair quality and significantly reducing material scrap and rework rates caused by installation errors.

[0058] It should be noted that the inflation volume settings, pressure limit values, and elastic limit values ​​of the main airbag 21, auxiliary airbag 22, and rubber sleeve 33 are all results obtained through multiple experiments by those skilled in the art.

[0059] This device, through the coordinated operation of an airbag mechanism 2, a sealing mechanism 3, and a locking mechanism 4, achieves precise control and fault-tolerant adjustment of the repair process through a multi-mechanism collaborative dynamic correction and reversible locking mechanism. Simultaneously, its flared double-sealing structure not only enhances the reliability of the end seal but also improves local hydraulic conditions through a streamlined transition. Compared to the single airbag used in existing technologies, this invention employs a main airbag 21, an auxiliary airbag 22, and adds a locking mechanism 32 and a locking mechanism 4, increasing equipment costs. However, the technical solution of this invention significantly improves the success rate of construction and the quality of repair, and effectively enhances the long-term durability and stability of the repaired body. From a long-term economic perspective, the increased equipment cost of this invention compared to existing technologies is negligible.

[0060] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0061] Furthermore, the terms "first," "second," "number one," and "number two" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first," "second," "number one," or "number two" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0062] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0063] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A trenchless pipeline repair airbag sealing device, comprising a moving mechanism for traction within the pipeline, characterized in that, The moving mechanism is equipped with an airbag mechanism for providing expansion power. An expansion sealing mechanism is fitted outside the airbag mechanism to seal the pipeline defect. The moving mechanism is equipped with a locking mechanism to control the locking and unlocking of the sealing mechanism. The moving mechanism includes a support shaft, and the airbag mechanism includes a main airbag coaxially sleeved in the middle of the support shaft and auxiliary airbags symmetrically sleeved at both ends of the support shaft. The air paths of the main airbag and the two auxiliary airbags are independently controlled. The sealing mechanism includes a telescopic cuff fitted around the main airbag and the auxiliary airbag. The telescopic cuff includes a cuff body and multiple extended arc ribs fixed to both ends of the cuff body, which together form a double sealing structure. The telescopic cuff is symmetrically provided with two locking mechanisms for locking the telescopic cuff after it has changed. The main body of the hoop has a non-closed ring shape with an axially open seam, and the two sides of the open seam overlap to form an overlapping joint. The locking mechanism includes a housing fixedly connected to the main body of the hoop and a self-locking component disposed therein; The locking mechanism includes a push plate that slides left and right on the support shaft and an up and down adaptation unit disposed on the support shaft; The upper and lower adaptation unit includes a movable column that is slidably connected to the support shaft, and a slider that is slidably connected to the movable column. The slider is provided with a second protrusion. The movable column is engaged with the docking groove on the housing of the locking mechanism through a docking rail. The self-locking component includes a Z-shaped lever rotatably mounted on the housing. The first end of the Z-shaped lever is connected to the main body of the tubular hoop via a spring. The bottom wall of the first end is provided with a protrusion one, and the second end is provided with a toothed block one and a toothed block two that mesh with the two sides of the overlapping part. The locking mechanism and the locking mechanism are configured in a one-to-one correspondence. The push plate is located between the auxiliary airbag and the locking mechanism on the corresponding side. The upper and lower adaptation units are detachably connected to the corresponding locking mechanisms. The expansion of the auxiliary airbag drives the push plate to move, which in turn pushes the protrusion of the self-locking component through the slider and the second protrusion, causing the Z-shaped lever of the self-locking component to rotate, thereby causing the first tooth block and the second tooth block to disengage from the overlapping part and thus unlocking. When the device is pulled into the pipeline, the engagement of the docking rail and the docking groove transmits tension to drive the sealing mechanism to move; when the device is pulled out of the pipeline in the opposite direction, the movable column slides away along the docking groove. During closure, the main airbag and auxiliary airbag drive the closure mechanism to expand and dynamically level in coordination; the auxiliary airbag drives the push plate to move, and the upper and lower adaptation units disengage the self-locking parts from the overlapping joints, releasing the self-locking mechanism before closure and restoring the self-locking mechanism after closure.

2. The airbag sealing device for trenchless pipeline repair according to claim 1, characterized in that, The moving mechanism includes two end moving frames symmetrically distributed on the left and right, and a support shaft is fixedly connected between the two end moving frames.

3. The airbag sealing device for trenchless pipeline repair according to claim 1, characterized in that, The main body of the hoop is made of rolled metal sheet, and multiple extended arc ribs together form a flared structure; the outer walls of the main body of the hoop and the extended arc ribs are covered with a rubber sleeve.

4. The airbag sealing device for trenchless pipeline repair according to claim 1, characterized in that, The locking mechanism is located inside the overlapping joint of the hoop body and is used to engage and lock the overlapping joint.

5. The airbag sealing device for trenchless pipeline repair according to claim 1, characterized in that, The support shaft is also provided with two limiting rings, which are located on the outside of the two auxiliary airbags respectively, and are used to axially limit the auxiliary airbags together with the corresponding locking mechanism.

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