Internal expansion type plug for pipe body upsetting

Abstract

The utility model provides an internal expansion type plug for pipe body upsetting and wrapping, and belongs to the technical field of pipeline machining. According to the utility model, the adjusting part of the locking seat is connected with the sleeve head of the internal expansion assembly, so that the adjusting part can adjust the position of the internal expansion assembly, thereby meeting the test plugging requirements of pipelines with different lengths and sizes, and improving the adaptability of equipment; besides, a limiting sleeve is arranged at the opening of the open hole of the sleeve head, a movable push block is arranged in the open hole, annular silica gel is arranged in the open hole, and the two ends of the annular silica gel abut against the limiting sleeve and the push block respectively, so that when the end of the to-be-detected pipeline is inserted into the limiting sleeve and synchronously inserted into the annular silica gel, the end of the to-be-detected pipeline is inserted into the limiting sleeve; the annular silica gel can be extruded by the push block to deform so as to be tightly attached to the outer wall of the end part of the pipeline to be detected, so that the outer wall of the pipeline is extruded and sealed, the sealing surface is larger, the sealing is more reliable, the problem that the pressure test precision is influenced by leakage easily caused by a small sealing surface is effectively avoided, and the detection accuracy is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of pipeline processing, in particular to an internal expansion plug for a pipe body pier. Background Art

[0002] For thin-walled small tubes and pipes with a pier structure at the end of the pipe body, they need to be pressure tested after processing to ensure that they can meet the intended use requirements.

[0003] At present, there are structures for sealing pipe orifices on the market, such as a sealing test plug disclosed in patent CN115752910A, which includes a clamping structure, a movable structure and a sealing structure. The clamping structure is a poorly curved clamping pipe orifice with a clamping block, which is clamped with the annular protrusion of the pipe head to be tested (the above-mentioned pier bag structure). The active member of the movable structure is rotatably connected to the clamping structure and spaced from the clamping block. The driven member of the movable structure is rotatably connected to the active member and slidably connected to the clamping structure. One end of the driven member is arranged toward the clamping block and reciprocates toward the clamping block under the drive of the active member. The sealing structure is arranged on the end surface of the driven member facing the clamping block and is provided with an elastic sealing gasket. The elastic sealing gasket can cover the pipe orifice and be squeezed by the driven member to seal the pipe head to be tested. This structure pushes the driven member to move toward one side of the clamping block by the rotation of the active member, so that the elastic sealing gasket on the driven member can be against the pipe orifice, and the pipe head is sealed by squeezing the elastic sealing gasket. While the aforementioned structure meets the sealing requirements for the pipe head, in actual use, the end face of the pipe head is sealed only by the elastic gasket. When the pipe wall is thin, the seal between the elastic gasket and the pipe head can be regarded as a linear seal, which is prone to leakage under high pressure, thus affecting the accuracy of pressure testing. In addition, the seal is completely achieved by the active member pushing the driven member to move. If the distance between the annular protrusion on the pipe and the pipe mouth is long, the elastic gasket will abut against the pipe head before the active member is fully rotated. This may cause the seal to occur before the active member is fully locked, affecting the sealing reliability and poor adaptability. Summary of the Invention

[0004] In response to the above-mentioned problems existing in the prior art, the present invention aims to provide an internal expansion type plug for a pipe body pier, in which an internal expansion component is arranged on a locking seat, and the internal expansion component has an open hole, and a push block is arranged in the open hole. At the same time, an annular silicone is arranged in the open hole, and the position of the internal expansion component can be adjusted by the locking seat to adapt to the testing requirements of pipes of different lengths. The adaptability is good, and after the end of the pipe is inserted into the open hole, the annular silicone is squeezed by the push block, so that the annular silicone is compressed and deformed and fits on the outer wall of the pipe, thereby realizing extrusion sealing of the outer wall of the pipe, with a larger sealing surface and higher sealing reliability, thereby avoiding the problem of sealing leakage affecting the accuracy of pressure testing.

[0005] The specific technical solutions are as follows:

[0006] An internal expansion plug for a pipe body pier has the following characteristics:

[0007] The locking seat includes a locking portion and an adjusting portion, the locking portion is fixedly mounted on the testing platform, and the adjusting portion is mounted on the locking portion and is retractable in one direction;

[0008] The internal expansion component includes a sleeve, a limiting sleeve, an annular silicone and a push block. One end of the sleeve is installed on the adjustment part, and an open hole is provided at the other end of the sleeve. The limiting sleeve is installed at the opening of the open hole of the sleeve, and a push block is provided at the end of the open hole away from the opening. The annular silicone is arranged in the open hole and is located between the limiting sleeve and the push block.

[0009] The above-mentioned internal expansion plug of the pipe body pier, wherein the adjustment part includes a connecting plate, an adjusting screw and a spring, one side of the connecting plate is connected to the locking part, and a number of adjusting screws extending toward the other side are evenly distributed on the connecting plate, and one end of each adjusting screw is threadedly connected to the sleeve, and each adjusting screw is sleeved with a spring, and the two ends of the spring are respectively against the connecting plate and the sleeve.

[0010] The above-mentioned internal expansion plug of a tube body pier bag, wherein the locking part includes a fixed seat, a guide cylinder, a telescopic rod, a handle and a connecting rod, the fixed seat is installed on the inspection table, one end of the fixed seat is hinged to one end of the handle, and the other end of the fixed seat is provided with a guide cylinder along the radial direction of the rotating shaft of the handle, the middle part of the telescopic rod is slidably arranged in the guide cylinder and one end is connected to the adjustment part, and the other end extends toward the end hinged to the handle, one end of the connecting rod is hinged to the end of the telescopic rod extending toward the handle, and the other end of the connecting rod is hinged to the handle, and the point where the handle and the connecting rod are hinged is separated from the hinge point where the handle is hinged on the fixed seat.

[0011] In the above-mentioned internal expansion plug for a pipe body pier, one end of the telescopic rod connected to the adjusting portion is a threaded end and is threadedly connected to the adjusting portion.

[0012] The above-mentioned internal expansion plug for a pipe body pier is arranged in a barrel shape, and an open hole is formed in the barrel cavity of the sleeve. An air inlet hole connected to the open hole is provided on the side wall at one end of the barrel bottom of the sleeve, and the part where the air inlet hole is connected to the open hole is located on the side of the push block away from the annular silicone.

[0013] In the above-mentioned internal expansion plug for a pipe body pier, a plurality of sealing grooves are provided at intervals on the side wall of the push block, and sealing rings are provided in the sealing grooves, and the sealing rings are against the inner wall of the open hole.

[0014] In the above-mentioned internal expansion plug for a pipe body pier, an avoidance hole is provided on the end surface of the push block close to one end of the annular silica gel.

[0015] The above-mentioned internal expansion plug of the pipe body pier is characterized in that the outer wall of the limiting sleeve is threadedly connected to the inner wall of the opening of the sleeve. At the same time, an annular limiting stop edge is provided on the inner wall of the limiting sleeve, and one end of the annular silicone rests on the annular limiting stop edge.

[0016] The above-mentioned internal expansion plug of the tube body is characterized in that one end of the limiting sleeve extends into the open hole, and the end of the push block close to the annular silicone extends into the limiting sleeve, and one or more sealing rings on the push block are located in the limiting sleeve and abut against the inner wall of the limiting sleeve.

[0017] In the above-mentioned internal expansion plug for a pipe body pier, one end of the limiting sleeve extending away from the open hole is exposed outside the sleeve, and the opening of the inner hole of the tube at the end of the limiting sleeve exposed outside the sleeve is arranged in a flared manner.

[0018] The positive effects of the above technical solution are:

[0019] The above-mentioned internal expansion plug of the pipe body pier is provided with a locking seat and an internal expansion component, and the adjusting part of the locking seat is connected to the sleeve of the internal expansion component. The position of the internal expansion component can be adjusted through the adjusting part, so as to adapt to the testing needs of pipes of different sizes and have better adaptability. In addition, a limiting sleeve is provided at the orifice of the open hole of the sleeve, and a push block is provided at the other end of the open hole. The annular silicone is provided in the open hole and is located between the limiting sleeve and the push block. After the end of the pipe to be tested is inserted into the open hole, the end of the pipe to be tested can pass through the annular silicone, and then the annular silicone is squeezed by the push block, so that the annular silicone can be wrapped on the outer wall of the pipe to be tested, thereby realizing extrusion sealing of the outer wall of the pipe, making the sealing surface larger and the sealing reliability higher, thereby avoiding the problem of sealing leakage affecting the accuracy of pressure testing. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a structural diagram of an embodiment of an internal expansion plug for a pipe body pier according to the present invention;

[0021] Figure 2 This is a structural diagram of a locking seat in a preferred embodiment of the present utility model;

[0022] Figure 3 This is a structural diagram of an internal expansion assembly in a preferred embodiment of the present utility model;

[0023] Figure 4 This is a cross-sectional view of an internal expansion assembly according to a preferred embodiment of the present invention.

[0024] In the accompanying drawings: 1. Locking seat; 11. Locking part; 12. Adjusting part; 111. Fixed seat; 112. Guide cylinder; 113. Telescopic rod; 114. Handle; 115. Connecting rod; 121. Connecting plate; 122. Adjusting screw; 123. Spring; 2. Internal expansion component; 21. Socket; 22. Limiting sleeve; 23. Annular silicone; 24. Push block; 211. Open hole; 212. Air inlet hole; 221. Annular limiting stop edge; 241. Sealing groove; 242. Avoidance hole; 3. Pipeline. DETAILED DESCRIPTION

[0025] In order to make the technical means, creative features, objectives and effects of the present invention easier to understand, the following embodiments are combined with the attached Figure 1 To the attached Figure 4 The technical solution provided by the present invention is described in detail, but the following content is not intended to limit the present invention.

[0026] Figure 1 This is a structural diagram of an embodiment of an internal expansion plug for a pipe body pier bag of the present utility model. Figure 1 As shown, the internal expansion plug of the pipe body pier provided in this embodiment includes: a locking seat 1 and an internal expansion component 2. The locking seat 1 is used to locate and adjust the position of the internal expansion component 2 to adapt to the sealing requirements of pipes 3 of different lengths. The internal expansion component 2 is used to seal the end of the pipe 3 to be tested to meet the pressure test requirements.

[0027] Figure 2 This is a structural diagram of a locking seat in a preferred embodiment of the present utility model. Figure 1 and Figure 2 As shown, the locking base 1 includes a locking portion 11 and an adjusting portion 12. During installation, the locking portion 11 is fixed to the test bench to fix the position of the locking portion 11 and improve the structural stability of the locking base 1. In addition, the adjusting portion 12 is installed on the locking portion 11 and can be extended in one direction, which provides conditions for subsequent adjustment of the position of the internal expansion component 2 through the adjusting portion 12.

[0028] Figure 3 This is a structural diagram of an internal expansion assembly in a preferred embodiment of the present utility model; Figure 4 This is a cross-sectional view of an internal expansion component of a preferred embodiment of the present invention. Figure 1 、 Figure 3 as well as Figure 4As shown, the internal expansion assembly 2 further comprises a sleeve 21, a limiting sleeve 22, an annular silicone rubber 23, and a push block 24. During installation, one end of the sleeve 21 is mounted on the adjustment portion 12, allowing the adjustment portion 12 to adjust the position of the sleeve 21 in one direction. Furthermore, an open hole 211 is formed at the other end of the sleeve 21, and the limiting sleeve 22 is mounted at the opening of the open hole 211 of the sleeve 21. This forms a limiting structure at the open hole 211 of the sleeve 21, providing conditions for subsequently restraining the annular silicone rubber 23 and allowing it to deform. Furthermore, a push block 24 is disposed at the end of the open hole 211 facing away from the opening. The push block 24 slides within the open hole 211, and the annular silicone rubber 23 is positioned within the open hole 211 and between the limiting sleeve 22 and the push block 24. This allows the push block 24 to squeeze or release the annular silicone rubber 23 when it moves. During use, the end of the pipe 3 to be sealed is inserted from the limiting sleeve 22 into the open hole 211, and at this time it is also inserted into the annular silicone 23. When the push block 24 is pushed toward the side of the limiting sleeve 22, the push block 24 squeezes the annular silicone 23 and deforms the annular silicone 23, so that the inner wall of the annular silicone 23 is tightly attached to the outer wall of the end of the pipe 3 to be sealed, thereby achieving an extrusion seal on the outer wall of the pipe 3, making the sealing surface larger and the sealing reliability higher, thereby avoiding the problem of sealing leakage affecting the accuracy of the pressure test and improving the accuracy of the detection.

[0029] Specifically, the adjustment portion 12 of the locking seat 1 includes a connecting plate 121, an adjusting screw 122, and a spring 123. During installation, one side of the connecting plate 121 is connected to the locking portion 11, so that the locking portion 11 can serve as a support for the connecting plate 121. At the same time, a number of adjusting screws 122 extending toward the other side are evenly distributed on the connecting plate 121. Preferably, the adjusting screws 122 are distributed in a circular array on the connecting plate 121 to ensure a more even distribution of the adjusting screws 122. In addition, one end extending from each adjusting screw 122 is threadedly connected to the sleeve 21, that is, the distance between the sleeve 21 and the connecting plate 121 is adjusted by twisting the adjusting screw 122, thereby meeting the adjustment of the position of the internal expansion component 2, thereby adapting to the sealing requirements of pipes 3 of different lengths and having better adaptability. In addition, a spring 123 is sleeved on each adjusting screw 122, and the two ends of the spring 123 respectively abut against the connecting plate 121 and the sleeve 21. That is, when the distance between the adjusting sleeve 21 and the connecting plate 121 is reduced, the spring 123 is compressed. Conversely, the spring 123 can be reset to push the sleeve 21 toward the side away from the connecting plate 121, making adjustment more convenient.

[0030] More specifically, the locking portion 11 of the locking base 1 further comprises a fixed base 111, a guide cylinder 112, a telescopic rod 113, a handle 114, and a connecting rod 115. During installation, the fixed base 111 is mounted on a test bench, and one end of the fixed base 111 is hingedly connected to one end of the handle 114, allowing the handle 114 to swing on the fixed base 111. Furthermore, a guide cylinder 112 is provided at the other end of the fixed base 111, radially along the axis of rotation of the handle 114. The middle portion of the telescopic rod 113 is slidably positioned within the guide cylinder 112, with one end connected to the adjustment portion 12. This allows the adjustment portion 12 to be adjusted in position by sliding the telescopic rod 113 within the guide cylinder 112, thereby improving its adaptability. In addition, the other end of the telescopic rod 113 is extended toward the hinged end of the handle 114. At the same time, one end of the connecting rod 115 is hinged to the end of the telescopic rod 113 extending toward the handle 114, and the other end of the connecting rod 115 is hinged to the handle 114, so that the connecting rod 115 serves as a power connection structure between the telescopic rod 113 and the handle 114. In addition, the point where the handle 114 and the connecting rod 115 are hinged is set to be spaced apart from the hinge point where the handle 114 is hinged on the fixed base 111, so that when the handle 114 is deflected, there is a height difference between the two ends of the connecting rod 115, so that the connecting rod 115 can adapt to the use requirements of the linear motion of the telescopic rod 113 by swinging its end. At the same time, the hinge points at both ends of the connecting rod 115 in the locked state and the hinge points where the handle 114 is hinged on the fixed base 111 can be distributed in a triangular shape, thereby meeting the locking requirements, that is, the handle 114 can push and pull the telescopic rod 113 through the connecting rod 115, so that the telescopic rod 113 can perform telescopic movement along the guide cylinder 112, and the telescopic rod 113 can be temporarily locked and unlocked through the handle 114, thereby meeting the testing requirements.

[0031] More specifically, one end of the telescopic rod 113 connected to the adjustment portion 12 is threaded and threadedly connected to the adjustment portion 12. By rotating the telescopic rod 113 and the adjustment portion 12 relative to each other, the position of the adjustment portion 12 on the telescopic rod 113 can be adjusted, further adjusting the position of the internal expansion assembly 2. This means that dual position adjustment of the adjustment portion 12 and the telescopic rod 113 is achieved, further improving the adaptability of the device. Preferably, a locking nut is also threadedly sleeved on the threaded end of the telescopic rod 113. After the adjustment between the telescopic rod 113 and the adjustment portion 12 is completed, the locking nut can be tightened against the adjustment portion 12 to limit the position of the telescopic rod 113 and the adjustment portion 12 after connection, thereby improving the stability of the connection.

[0032] More specifically, the sleeve 21 of the internal expansion assembly 2 is arranged in a barrel shape. The barrel cavity of the sleeve 21 forms an open hole 211, which facilitates the installation of the limiting sleeve 22, the annular silicone rubber 23, and the push block 24, as well as the subsequent insertion of the end of the pipe 3 to be inspected. Furthermore, an air inlet 212 is provided on the sidewall at one end of the barrel bottom of the sleeve 21, communicating with the open hole 211. An air inlet pipe is connected to the air inlet 212, and the portion where the air inlet 212 connects to the open hole 211 is located on the side of the push block 24 facing away from the annular silicone rubber 23. In other words, when air is inflated through the air inlet 212, the air pressure pushes the push block 24 toward the annular silicone rubber 23, compressing and deforming the annular silicone rubber 23 and achieving a squeeze seal against the outer wall of the pipe 3. This provides a more reliable sealing method and allows the movement of the push block 24 to be achieved through the air pressure line, resulting in lower operating costs.

[0033] More specifically, a plurality of sealing grooves 241 are provided on the side wall of the push block 24. The plurality of sealing grooves 241 are arranged at intervals along the axial direction of the push block 24. At the same time, a sealing ring is provided in each sealing groove 241. When the push block 24 is installed in the open hole 211 of the sleeve 21, the sealing ring can abut against the inner wall of the open hole 211, thereby achieving a seal between the push block 24 and the inner wall of the open hole 211, so that the gas entering the open hole 211 from the air inlet 212 will not leak and lose pressure, thereby meeting the use requirement of stably pushing the push block 24 to move.

[0034] More specifically, an avoidance hole 242 is further provided on the end surface of the push block 24 near one end of the annular silicone 23. Since the end of the pipe 3 to be inspected will be inserted into the annular silicone 23 during sealing, when the annular silicone 23 is squeezed by the push block 24, the end of the pipe 3 to be inspected can be accommodated through the avoidance hole 242, so that the push block 24 can continue to squeeze the annular silicone 23 without being supported by the end of the pipe 3 to be inspected, ensuring that the deformation of the annular silicone 23 can be more thorough and the extrusion sealing effect of the outer wall of the pipe 3 is better.

[0035] More specifically, the outer wall of the limiting sleeve 22 is threadedly connected to the inner wall of the opening 211 of the sleeve 21, which facilitates the assembly and disassembly of the limiting sleeve 22 on the sleeve 21, thereby facilitating the installation of the annular silicone rubber 23, the push block 24, and other structures within the opening 211, as well as their subsequent maintenance and replacement. In addition, an annular limiting stop 221 is provided on the inner wall of the limiting sleeve 22. At this time, when one end of the annular silicone rubber 23 is pressed against the annular limiting stop 221, a step with a larger surface area is formed on the inner wall of the limiting sleeve 22 by the annular limiting stop 221, thereby providing a more stable support base for the annular silicone rubber 23, avoiding the problem of the annular silicone rubber 23 being squeezed out and becoming ineffective, and the structural design is more reasonable.

[0036] More specifically, one end of the limiting sleeve 22 is extended into the open hole 211, thereby increasing the length of the limiting sleeve 22. Simultaneously, the end of the push block 24 proximal to the annular silicone rubber 23 is extended into the limiting sleeve 22. At this point, the annular silicone rubber 23 is completely within the limiting sleeve 22, and one end of the push block 24 also squeezes the annular silicone rubber 23 within the limiting sleeve 22, thereby causing the deformation of the annular silicone rubber 23 to be located within the same structure, thereby avoiding force dispersion, achieving a better sealing effect, and making the seal more reliable. Furthermore, one or more sealing rings on the push block 24 are positioned within the limiting sleeve 22 and abut against the inner wall of the limiting sleeve 22, thereby achieving a seal between the push block 24 and the limiting sleeve 22. This allows the push block 24 to not only seal against the wall of the open hole 211 of the sleeve 21, but also against the inner wall of the limiting sleeve 22, achieving a double seal, further avoiding air pressure leakage, and providing a more reasonable structural design.

[0037] More specifically, the end of the limiting sleeve 22 that extends away from the open hole 211 is exposed outside the sleeve 21, which facilitates the direct insertion of the end of the pipe 3 to be inspected into the limiting sleeve 22 and into the annular silicone rubber 23. In addition, the opening of the inner hole of the limiting sleeve 22 at the end exposed outside the sleeve 21 is arranged in a flared shape, providing a guide for the end of the pipe 3 to be inspected to be inserted into the limiting sleeve 22, making it more convenient to use.

[0038] The internal expansion plug of the pipe body pier provided in this embodiment includes a locking seat 1 and an internal expansion component 2; by connecting the adjusting portion 12 of the locking seat 1 with the sleeve 21 of the internal expansion component 2, the adjusting portion 12 can adjust the position of the internal expansion component 2, thereby meeting the test and plugging requirements of pipes 3 of different lengths and sizes, thereby improving the adaptability of the equipment; in addition, a limiting sleeve 22 is provided at the empty opening of the open hole 211 of the sleeve 21, and a movable push block 24 is provided in the open hole 211, and an annular silicone rubber 23 is provided. The outer wall of the pipe 3 to be tested is sealed by squeezing the outer wall of the pipe 3, thereby increasing the sealing surface and improving the sealing reliability. This effectively avoids the problem of affecting the pressure test accuracy due to leakage caused by a small sealing surface, and improves the detection accuracy.

[0039] The above are only preferred embodiments of the present invention and do not limit the implementation methods and protection scope of the present invention. Those skilled in the art should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. An internal expansion plug for a pipe body pier, characterized in that: include: A locking seat, comprising a locking portion and an adjusting portion, wherein the locking portion is fixedly mounted on the testing platform, and the adjusting portion is mounted on the locking portion and is extendable in one direction; An internal expansion component, which includes a sleeve, a limiting sleeve, an annular silicone and a push block. One end of the sleeve is installed on the adjusting part, and the other end of the sleeve is provided with an open hole. The limiting sleeve is installed at the opening of the open hole of the sleeve, and the push block is provided at the end of the open hole away from the opening. The annular silicone is arranged in the open hole and is located between the limiting sleeve and the push block.

2. The internal expansion plug for the pipe body according to claim 1, characterized in that: The adjusting portion includes a connecting plate, an adjusting screw and a spring. One side of the connecting plate is connected to the locking portion. Several adjusting screws extending toward the other side are evenly distributed on the connecting plate. One end of each adjusting screw extending out is threadedly connected to the sleeve. In addition, a spring is sleeved on each adjusting screw, and both ends of the spring respectively abut against the connecting plate and the sleeve.

3. The internal expansion plug for the pipe body according to claim 1, characterized in that: The locking part includes a fixed seat, a guide cylinder, a telescopic rod, a handle and a connecting rod. The fixed seat is installed on the detection platform, one end of the fixed seat is hinged to one end of the handle, and the other end of the fixed seat is provided with the guide cylinder along the radial direction of the rotating shaft of the handle. The middle part of the telescopic rod is slidably arranged in the guide cylinder and one end is connected to the adjusting part, and the other end extends toward the hinged end of the handle. One end of the connecting rod is hinged to the end of the telescopic rod extending toward the handle, and the other end of the connecting rod is hinged to the handle, and the point where the handle is hinged to the connecting rod is spaced apart from the hinge point where the handle is hinged on the fixed seat.

4. The internal expansion plug for the pipe body according to claim 3, characterized in that: One end of the telescopic rod connected to the adjusting portion is a threaded end and is threadedly connected to the adjusting portion.

5. The internal expansion plug for the pipe body according to claim 1, characterized in that: The sleeve is arranged in a barrel shape, and the inner cavity of the barrel of the sleeve forms the open hole. An air inlet connected to the open hole is provided on the side wall of one end of the barrel bottom of the sleeve, and the part where the air inlet is connected to the open hole is located on the side of the push block away from the annular silicone.

6. The internal expansion plug for the pipe body according to claim 5, characterized in that: A plurality of sealing grooves are arranged at intervals on the side wall of the push block, and sealing rings are arranged in the sealing grooves, and the sealing rings are pressed against the inner wall of the open hole.

7. The internal expansion plug for the pipe body according to claim 1, characterized in that: An avoidance hole is provided on the end surface of the push block close to one end of the annular silica gel.

8. The internal expansion plug for the pipe body according to claim 6, characterized in that: The outer wall of the limiting sleeve is threadedly connected to the inner wall of the opening of the open hole of the sleeve. At the same time, an annular limiting stop edge is provided on the inner wall of the limiting sleeve, and one end of the annular silicone rests on the annular limiting stop edge.

9. The internal expansion plug for the pipe body according to claim 8, characterized in that: One end of the limiting sleeve extends into the open hole, and one end of the push block close to the annular silicone extends into the limiting sleeve, and one or more sealing rings on the push block are located in the limiting sleeve and abut against the inner wall of the limiting sleeve.

10. The internal expansion plug for the pipe body according to claim 9, characterized in that: One end of the limiting sleeve extending away from the open hole is exposed outside the sleeve, and the opening of the inner hole of the end of the limiting sleeve exposed outside the sleeve is arranged in a flared manner.

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