Pipeline plugging device

Abstract

The utility model provides a pipeline plugging device which comprises a pipe connecting body, an upper cover, a pipe plug, a positioning pin, a pressing assembly and a fastening assembly, the pipe connecting body is provided with a flange part and a connecting pipe part, the flange part is detachably connected with the upper cover through the fastening assembly, and the connecting pipe part is used for being welded to a metal pipeline; the pipe plug is arranged in the pipe connecting body; a plurality of mounting holes are formed in the outer circumference of the flange part, and the positioning pins are arranged in the mounting holes; the pressing assembly comprises a pressing nut and a pressing rod, the pressing nut is arranged at the outer end of the mounting hole, the pressing rod is arranged in the pressing nut in a matched mode, and the inner end of the pressing rod abuts against the positioning pin. The positioning pin is arranged in the mounting hole in a sealed mode through the first sealing ring, the outer end of the positioning pin is pressed through the pressing assembly, the second sealing ring is arranged between the pipe plug and the pipe connecting body, the third sealing ring is arranged between the flange part and the upper cover, positioning and mounting are convenient, and the sealing performance and firmness of the pipeline plugging device can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of pipeline plugging, in particular to a pipeline plugging device. Background Art

[0002] A pipeline is a device for transporting gases, liquids or fluids with solid particles, and is an important equipment indispensable in urban construction. Classified by materials, pipelines can be divided into metal pipelines and non-metal pipelines. In the maintenance, modification, etc. of metal pipelines, a plugging device needs to be welded at the opening on the pipeline.

[0003] Currently, the plugging devices commonly used for metal pipelines generally include components such as flanges, plugs and pins. The pins are assembled in the holes provided in the circumferential part of the flange, and the plug is fixed in the flange by the pins. However, in such plugging devices, the assembly sealing performance and firmness between the pins and the flanges are insufficient, and there is a risk of the pins coming out. Therefore, improvement is needed. Summary of the Utility Model

[0004] The purpose of the utility model is to solve the disadvantages existing in the prior art, and to propose a pipeline plugging device, which is convenient for installation and improves the sealing performance and firmness of the pipeline plugging device.

[0005] To achieve the above purpose, the utility model adopts the following technical scheme:

[0006] A pipeline plugging device, the pipeline plugging device includes a pipe joint body, an upper cover, a pipe plug, a positioning dowel pin and a pressing component.

[0007] The pipe joint body has a flange part and a connecting pipe part arranged coaxially, and the flange part is detachably connected with the upper cover; the pipe plug is arranged inside the pipe joint body; a plurality of mounting holes are provided on the outer circumference of the flange part, and each mounting hole is arranged along the radial direction of the flange part.

[0008] The positioning dowel pin is arranged in the mounting hole; a first sealing groove is provided on the positioning dowel pin, and a first sealing ring is arranged in the first sealing groove, and the first sealing ring is in close fit with the hole wall of the mounting hole.

[0009] The pressing component includes a compression nut and a pressing rod. The compression nut is arranged at the outer end of the mounting hole, the pressing rod is cooperatively arranged inside the compression nut, and the inner end of the pressing rod abuts against the positioning dowel pin.

[0010] Preferably, the pipeline plugging device further includes a fastening assembly, which includes fastening screws and fastening nuts. A plurality of first fixing holes are provided on the upper cover, and a plurality of corresponding second fixing holes are provided on the flange portion. The flange portion and the upper cover are detachably connected by the fastening screws and the fastening nuts. The fastening screws pass through the corresponding first fixing holes and second fixing holes and are threadedly connected to the fastening nuts.

[0011] Preferably, a second sealing groove is provided on the outer side wall of the pipe plug, and a second sealing ring is provided in the second sealing groove. The second sealing ring is in close fit with the inner side wall of the pipe joint body.

[0012] Preferably, a sealing table is provided on the top end face of the flange portion, and the sealing table protrudes from the top end face of the flange portion; a third sealing groove is provided at the bottom of the upper cover, and the third sealing groove faces the sealing table. A third sealing ring is provided in the third sealing groove, and the third sealing ring is in close fit with the table top of the sealing table.

[0013] Preferably, a limiting ring is provided on the inner circumference of the sealing table, and the limiting ring protrudes from the table top of the sealing table. A limiting groove is provided at the center of the bottom of the upper cover, and the limiting ring enters the limiting groove. The outer diameter of the limiting ring is not greater than the inner diameter of the limiting groove.

[0014] Preferably, a first positioning conical surface is provided on the outer side wall of the pipe plug, and a second positioning conical surface is provided at the connection between the inner wall of the flange portion and the connecting pipe portion. The second positioning conical surface cooperates with the first positioning conical surface.

[0015] Preferably, a third positioning conical surface is provided on the peripheral portion of the top end of the pipe plug, and a fourth positioning conical surface is provided at the inner end of the positioning pin. The fourth positioning conical surface cooperates with the third positioning conical surface.

[0016] Preferably, the installation hole includes a first hole position and a second hole position that communicate with each other. The first hole position is located inside the second hole position. The structure of the first hole position cooperates with the structure of the positioning pin, and the positioning pin is provided in the first hole position; the second hole position is provided with an internal thread. The pressing nut has threads both inside and outside, and the pressing nut is threadedly matched with the second hole position. The pressing rod is threadedly matched with the pressing nut.

[0017] Preferably, the positioning pin includes an inner end portion, a main body portion, and an outer end portion that are coaxially arranged. The inner end portion abuts against the pipe plug. The first sealing groove is provided on the main body portion, and the outer end portion is provided with an external thread.

[0018] Preferably, a first auxiliary hole is provided at the top of the pipe plug; and / or, a second auxiliary hole is provided at the outer end face of the positioning pin; and / or, a third auxiliary hole is provided at the outer end face of the pressing rod.

[0019] Compared with the prior art, the beneficial effects of the present utility model are as follows: In the pipeline plugging device of the present utility model, the positioning dowel pin is hermetically arranged in the mounting hole through a sealing ring, and the outer end of the positioning dowel pin is pressed by a pressing assembly, which is convenient for installation and can improve the sealing performance and firmness of the pipeline plugging device. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is an exploded view of the pipeline plugging device according to some embodiments of the present utility model;

[0021] Figure 2 is an exploded view of the pipeline plugging device according to some embodiments of the present utility model from another perspective;

[0022] Figure 3 is a schematic structural diagram of the pipeline plugging device according to some embodiments of the present utility model;

[0023] Figure 4 is a cross-sectional view of the pipeline plugging device according to some embodiments of the present utility model;

[0024] Figure 5 is Figure 4 an enlarged structural view of part A in

[0025] Figure 6 is a schematic structural diagram of the pipe joint body according to some embodiments of the present utility model;

[0026] Figure 7 is a schematic structural diagram of the upper cover according to some embodiments of the present utility model;

[0027] Figure 8 is a schematic structural diagram of the pipe plug according to some embodiments of the present utility model;

[0028] Figure 9 is a schematic structural diagram of the positioning dowel pin according to some embodiments of the present utility model.

[0029] In the figure, 10 - pipe joint body, 11 - flange part, 111 - mounting hole, 1111 - first hole position, 1112 - second hole position, 112 - sealing table, 113 - limiting ring, 114 - second fixing hole, 12 - connecting pipe part, 13 - second positioning conical surface, 20 - upper cover, 21 - third sealing groove, 22 - third sealing ring, 23 - limiting groove, 24 - first fixing hole, 30 - pipe plug, 31 - first positioning conical surface, 32 - third positioning conical surface, 33 - second sealing groove, 34 - second sealing ring, 35 - first auxiliary hole, 40 - positioning pin, 41 - inner end part, 411 - fourth positioning conical surface, 42 - main body part, 421 - first sealing groove, 422 - first sealing ring, 43 - outer end part, 421 - external thread, 432 - second auxiliary hole, 50 - pressing component, 51 - compression nut, 52 - pressing rod, 521 - third auxiliary hole, 60 - fastening component, 61 - fastening screw, 62 - fastening nut. Detailed implementation manners

[0030] To make the objectives, technical solutions and advantages of the present utility model clearer, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are some but not all of the embodiments of the present utility model. Based on the described embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present utility model. It can be understood that, without conflict, some technical means described in the various embodiments herein may be replaced or combined with each other.

[0031] In the description of the present utility model, if there are terms such as "first" and "second", they are only used to distinguish the described objects and do not have any sequential or technical meanings. Thus, the objects defined with "first", "second", etc. may explicitly or implicitly include one or more of such objects. Also, similar terms such as "one" or "a" do not indicate a quantity limitation, but rather indicate that there is at least one, and "multiple" means not less than two.

[0032] In the description of the specification of the present utility model, referring to "one embodiment" or "some embodiments" etc. means that in one or more embodiments of the present utility model, there are included specific features, structures or characteristics described in combination with that embodiment. Thus, statements such as "in one embodiment", "in some embodiments", "in other some embodiments", "in still other embodiments" etc. appearing in different places in this specification are not necessarily all referring to the same embodiment, but rather mean "one or more but not all of the embodiments", unless otherwise specifically emphasized in other ways.

[0033] The present utility model provides a pipeline plugging device for plugging metal pipelines to facilitate pipeline maintenance, modification and other operations.

[0034] Referring to Figures 1 to 9 , the pipeline plugging device includes a pipe joint body 10, an upper cover 20, a pipe plug 30, a positioning dowel pin 40 and a pressing component 50.

[0035] Specifically, the pipe joint body 10 has a flange portion 11 and a connecting pipe portion 12 arranged coaxially. The flange portion 11 is detachably connected to the upper cover 20, and the connecting pipe portion 12 is used for welding with the metal pipeline. The pipe joint body 10 can be prepared by an integral molding process or by processes such as welding. The pipe plug 30 is disposed inside the pipe joint body 11, and the pipe plug 30 is used for plugging the inner central hole of the pipe joint body 10. A plurality of mounting holes 111 are provided on the outer circumference of the flange portion 11, and each mounting hole 111 is arranged along the radial direction of the flange portion 11. Among them, the number of the mounting holes 111 can be reasonably set according to the actual situation. Referring to Figure 1 , in some embodiments, four mounting holes 111 are provided on the outer circumference of the flange portion 11, and the four mounting holes 111 are arranged at equal intervals along the circumferential direction of the flange portion 11.

[0036] The number of the positioning dowel pins 40 is the same as that of the mounting holes 111, and the positioning dowel pins 40 are disposed in the mounting holes 111. A first sealing groove 421 is provided on the positioning dowel pin 40, and a first sealing ring 422 is provided in the first sealing groove 421. The first sealing ring 422 is in close fit with the hole wall of the mounting hole 111. Among them, the first sealing groove 421 is arranged around the positioning dowel pin 40, and the number of the first sealing grooves 421 is at least one, and a first sealing ring 422 is correspondingly arranged in each first sealing groove 421. For example, in some embodiments, two first sealing grooves 421 are axially spaced on the positioning dowel pin 40, and a first sealing ring 422 is correspondingly arranged in each first sealing groove 421. In this way, the assembly sealing performance between the positioning dowel pin 40 and the pipe joint body 10 can be enhanced, and the leakage of the medium in the pipeline can be avoided. Preferably, the thickness of the first sealing ring 422 is slightly greater than the depth of the first sealing groove 421. After the first sealing ring 422 is installed in the first sealing groove 421, the first sealing ring 422 protrudes from the first sealing groove 421. In this way, when the positioning dowel pin 40 is assembled into the mounting hole 111, the first sealing ring 422 is extruded, so as to be in close fit with the hole wall of the mounting hole 111, thereby improving the sealing performance.

[0037] The pressing component 50 includes a compression nut 51 and a pressing rod 52. The compression nut 51 is disposed at the outer end of the mounting hole 111 (the end of the mounting hole far from the central hole of the flange portion 11), and the pressing rod 52 is cooperatively disposed inside the compression nut 51, and the inner end of the pressing rod 52 abuts against the positioning dowel pin 40.

[0038] During assembly, first install the first sealing ring 422 into the first sealing groove 421, insert the positioning dowel pin 40 into the mounting hole 111, then install the compression nut 51 at the outer end of the mounting hole 111, and then assemble the pressure rod into the compression nut 51 and tighten it, so that the pressure rod 52 presses the positioning dowel pin 40, thereby preventing the positioning dowel pin 40 from protruding outwards and enhancing the assembly firmness of the positioning dowel pin 40.

[0039] In the above pipeline plugging device, the positioning dowel pin 40 is hermetically arranged in the mounting hole 111 through the first sealing ring 422, and the outer end of the positioning dowel pin 40 is pressed by the pressing assembly 50, which is convenient for installation and can improve the sealing performance and firmness of the pipeline plugging device.

[0040] Refer to Figures 1 to 3 , in some embodiments, the pipeline plugging device further includes a fastening assembly 60. The fastening assembly 60 includes a fastening screw 61 and a fastening nut 62. A plurality of first fixing holes 24 are provided on the upper cover 20, and a plurality of corresponding second fixing holes 114 are provided on the flange portion 11. The flange portion 11 and the upper cover 20 are detachably connected by the fastening screw 61 and the fastening nut 62. The fastening screw 61 passes through the corresponding first fixing hole 24 and second fixing hole 114 and is threadedly connected to the fastening nut 62. Among them, the number of the first fixing holes 24 can be reasonably set according to the actual situation, and the numbers of the second fixing holes 114, the fastening screws 61, and the fastening nuts 62 are respectively the same as the number of the first fixing holes 24. For example, in some embodiments, four first fixing holes 24 are provided on the upper cover 20, and the four first fixing holes 24 are evenly spaced along the circumferential direction of the upper cover 20, and the central axis of each first fixing hole 24 is parallel to the central axis of the upper cover 20; four corresponding second fixing holes 114 are provided on the flange portion 11, and the four second fixing holes 114 are evenly spaced along the circumferential direction of the flange portion 11, and the central axis of each second fixing hole 114 is parallel to the central axis of the flange portion 11, and the four second fixing holes 114 are arranged in a staggered manner with the four mounting holes 111. Of course, the present invention is not limited thereto. In other embodiments, the flange portion 11 and the upper cover 20 can also adopt other suitable detachable connection methods.

[0041] Refer to Figure 4 and Figure 8, in some preferred embodiments, a second sealing groove 33 is provided on the outer sidewall of the pipe plug 30, and a second sealing ring 34 is provided in the second sealing groove 33. The second sealing ring 34 is in close fit with the inner sidewall of the pipe joint 10. Among them, the second sealing groove 33 is arranged around the pipe plug 30, and the second sealing ring 34 can be a rubber sealing ring. Further, the thickness of the second sealing ring 34 is slightly greater than the depth of the second sealing groove 33. After the second sealing ring 34 is installed in the second sealing groove 33, it can protrude from the second sealing groove 33. In this way, after the pipe plug 30 is assembled into the interior of the pipe joint 11, the second sealing ring 34 is extruded, so as to be in close fit with the inner sidewall of the pipe joint 10, thereby improving the assembly sealing performance between the pipe plug 30 and the pipe joint 10.

[0042] Refer to Figures 5 to 7 , in some preferred embodiments, a sealing platform 112 is provided on the top end face of the flange portion 11. The sealing platform 112 is annular and protrudes from the top end face of the flange portion 11. A third sealing groove 21 is provided at the bottom of the upper cover 20. The third sealing groove 21 is an annular groove, and the third sealing groove 21 faces the sealing platform 112. A third sealing ring 22 is provided in the third sealing groove 21. The third sealing ring 22 is in close fit with the tabletop of the sealing platform 112. Among them, the third sealing ring 22 can be a rubber sealing ring. Further, the thickness of the third sealing ring 22 is slightly greater than the depth of the third sealing groove 21. After the third sealing ring 22 is installed in the third sealing groove 21, it can protrude from the third sealing groove 21. In this way, after the flange portion 11 and the upper cover 20 are connected and fixed, the third sealing ring 22 is extruded, so as to be in close fit with the tabletop of the sealing platform 112, thereby improving the assembly sealing performance between the flange portion 11 and the upper cover 20.

[0043] Further, a limiting ring 113 is provided on the inner circumference of the sealing platform 112. The limiting ring 113 is a ring structure and protrudes from the tabletop of the sealing platform 112. A limiting groove 23 is provided at the center of the bottom of the upper cover 20. The limiting groove 23 is a circular groove. The limiting ring 113 enters the limiting groove 23, and the outer diameter of the limiting ring 113 is not greater than the inner diameter of the limiting groove 23. Preferably, the outer diameter of the limiting ring 113 is the same as the inner diameter of the limiting groove 23. During the assembly process of the flange portion 11 and the upper cover 20, the limiting ring 113 enters the limiting groove 23, and the outer sidewall of the limiting ring 113 is in contact with the inner groove wall of the limiting groove 23, which can not only play a positioning role to limit the relative movement between the flange portion 11 and the upper cover 20, but also play a certain sealing role.

[0044] Refer to Figure 4 and Figure 8, in some preferred embodiments, a first positioning conical surface 31 is provided on the outer sidewall of the pipe plug 30, and a second positioning conical surface 13 is provided at the connection between the inner walls of the flange portion 11 and the connecting pipe portion 12. The second positioning conical surface 31 cooperates with the first positioning conical surface 13. Among them, the first positioning conical surface 31 is a conical surface structure that is wider at the top and narrower at the bottom, and the second positioning conical surface 13 is a conical surface structure that is wider at the top and narrower at the bottom and cooperates with it. After the pipe plug 30 is inserted into the inside of the pipe joint body 11, the second positioning conical surface 13 fits with the first positioning conical surface 31, so as to position the pipe plug 30 and ensure the assembly accuracy of the pipe plug 30.

[0045] Further, referring to Figure 5 , Figure 8 and Figure 9 , a third positioning conical surface 32 is provided on the circumferential portion at the top of the pipe plug 30, and a fourth positioning conical surface 411 is provided at the inner end of the positioning pin 40. The fourth positioning conical surface 411 cooperates with the third positioning conical surface 32. Among them, the central axis of the third positioning conical surface 32 is perpendicular to the central axis of the fourth positioning conical surface 411. The third positioning conical surface 32 is a conical surface structure that is narrower at the top and wider at the bottom (along the axial direction of the pipe plug 30, the direction close to the upper cover 20 is the top, and the direction away from the upper cover 20 is the bottom), and the fourth positioning conical surface 411 is a conical surface structure that is narrower inside and wider outside (along the radial direction of the flange portion 11, the direction close to the central axis of the flange portion 11 is the inside, and the direction away from the central axis of the flange portion 11 is the outside). After the pipe plug 30 is inserted into the inside of the pipe joint body 11, the second positioning conical surface 13 fits with the first positioning conical surface 31, so as to position the pipe plug 30 and prevent the pipe plug 30 from moving downward; after the positioning pin 40 is assembled into the mounting hole 111, the fourth positioning conical surface 411 abuts against the third positioning conical surface 32, which can limit the upward movement of the pipe plug 30, thereby further improving the assembly accuracy and stability of the pipe plug 30.

[0046] Referring to Figure 4 and Figure 5 , in some preferred embodiments, the mounting hole 111 includes a first hole position 1111 and a second hole position 1112 that are communicated with each other. The first hole position 1111 is located inside the second hole position 1112. The structure of the first hole position 1111 cooperates with the structure of the positioning pin 40, and the positioning pin 40 is arranged in the first hole position 1111. The second hole position 1112 is provided with an internal thread. The pressure nut 51 is provided with threads both inside and outside. The pressure nut 51 is in threaded cooperation with the second hole position 1112. The pressure rod 52 is provided with an external thread, and the pressure rod 52 is in threaded cooperation with the pressure nut 51. The pressing assembly 50 is assembled by a threaded structure, which is convenient to operate and has high assembly efficiency.

[0047] Referring to Figure 5 and Figure 9, in some preferred embodiments, the positioning dowel pin 40 includes an inner end portion 41, a main body portion 42, and an outer end portion 43 that are coaxially arranged. The inner end portion 41 abuts against the pipe plug 30, and the above-mentioned fourth positioning conical surface 411 is provided on the inner end portion 41. The first sealing groove 421 is provided on the main body portion 42. The outer diameter of the outer end portion 43 is larger than the outer diameter of the main body portion 42 or the inner end portion 41, and the outer end portion 43 is provided with an external thread. Correspondingly, the first hole position 1111 is set as a stepped hole, and an internal thread is provided at the installation position of the first hole position 1111 corresponding to the outer end portion 43, and the outer end portion 43 is in threaded fit with the first hole position 1111.

[0048] Referring to Figure 8 , in some preferred embodiments, a first auxiliary hole 35 is provided at the top of the pipe plug 30. The first auxiliary hole 35 does not penetrate the pipe plug 30. The first auxiliary hole 35 is used to facilitate the assembly of the pipe plug 30 into the pipe joint 11 with the help of tools such as a wrench. The shape and quantity of the first auxiliary hole 35 can be reasonably set according to the actual situation.

[0049] Referring to Figure 9 , in some preferred embodiments, a second auxiliary hole 432 is provided on the outer end face of the positioning dowel pin 40. The second auxiliary hole 432 is used to facilitate the assembly of the positioning dowel pin 40 into the installation hole 111 with the help of tools such as a wrench. The shape of the second auxiliary hole 432 can be reasonably set according to the actual situation. For example, the second auxiliary hole 432 can be set as a hexagonal counterbore.

[0050] Referring to Figure 5 , in some preferred embodiments, a third auxiliary hole 521 is provided on the outer end face of the pressure rod 52. The third auxiliary hole 521 is used to facilitate the assembly of the pressure rod 52 into the pressure nut 51 with the help of tools such as a wrench. The shape of the third auxiliary hole 521 can be reasonably set according to the actual situation. For example, the third auxiliary hole 521 can be set as a hexagonal counterbore.

[0051] In summary, the present utility model provides a pipeline plugging device for plugging a metal pipeline. The positioning dowel pin is hermetically arranged in the installation hole of the flange portion through a first sealing ring. The outer end of the positioning dowel pin is pressed by a pressing assembly. A second sealing ring is arranged between the pipe plug and the pipe joint, and a third sealing ring is arranged between the flange portion and the upper cover, which is convenient for positioning and installation, and can improve the sealing performance and firmness of the pipeline plugging device.

[0052] The present utility model has been described by the above related embodiments. However, the above embodiments are only examples for implementing the present utility model. It must be pointed out that the disclosed embodiments do not limit the scope of the present utility model. On the contrary, modifications and refinements made without departing from the spirit and scope of the present utility model fall within the scope of the patent protection of the present utility model.

Claims

1. A pipeline plugging device, characterized in that: The pipeline plugging device comprises a pipe connection body, an upper cover, a pipe plug, a positioning pin and a pressing assembly; The pipe connection body has a coaxially arranged flange portion and a connecting pipe portion, and the flange portion is detachably connected to the upper cover; the pipe plug is arranged inside the pipe connection body; the outer circumference of the flange portion is provided with a plurality of mounting holes, and each mounting hole is arranged along the radial direction of the flange portion; The positioning pin is arranged in the mounting hole; a first sealing groove is arranged on the positioning pin, a first sealing ring is arranged in the first sealing groove, and the first sealing ring is tightly fitted with the hole wall of the mounting hole; The clamping assembly comprises a pressing nut and a pressing rod, wherein the pressing nut is arranged at the outer end of the mounting hole, the pressing rod is arranged in cooperation with the inside of the pressing nut, and the inner end of the pressing rod abuts against the positioning pin.

2. The pipeline plugging device according to claim 1, characterized in that: The pipeline plugging device also includes a fastening assembly, which includes a fastening screw and a fastening nut. The upper cover is provided with a plurality of first fixing holes, and the flange portion is correspondingly provided with a plurality of second fixing holes. The flange portion and the upper cover are detachably connected through the fastening screw and the fastening nut. The fastening screw passes through the corresponding first fixing hole and the second fixing hole and is threadedly connected with the fastening nut.

3. The pipeline plugging device according to claim 1, characterized in that: The outer side wall of the pipe plug is provided with a second sealing groove, a second sealing ring is provided in the second sealing groove, and the second sealing ring is tightly fitted with the inner side wall of the pipe connection body.

4. The pipeline plugging device according to claim 1, characterized in that: A sealing platform is provided on the top end surface of the flange part, and the sealing platform protrudes from the top end surface of the flange part; a third sealing groove is provided on the bottom of the upper cover, and the third sealing groove is opposite to the sealing platform. A third sealing ring is provided in the third sealing groove, and the third sealing ring is tightly fitted with the surface of the sealing platform.

5. The pipeline plugging device according to claim 4, characterized in that: A limiting ring is provided on the inner periphery of the sealing platform, and the limiting ring protrudes from the surface of the sealing platform. A limiting groove is provided in the center of the bottom of the upper cover, and the limiting ring enters the limiting groove. The outer diameter of the limiting ring is not greater than the inner diameter of the limiting groove.

6. The pipeline plugging device according to claim 1, characterized in that: The outer side wall of the pipe plug is provided with a first positioning conical surface, and the connection between the flange part and the inner wall of the connecting pipe part is provided with a second positioning conical surface, and the second positioning conical surface matches the first positioning conical surface.

7. The pipeline plugging device according to claim 1, characterized in that: A third positioning conical surface is provided at the periphery of the top end of the pipe plug, and a fourth positioning conical surface is provided at the inner end of the positioning column pin, and the fourth positioning conical surface matches the third positioning conical surface.

8. The pipeline plugging device according to claim 1, characterized in that: The mounting hole includes a first hole position and a second hole position which are interconnected, the first hole position being located on the inner side of the second hole position, the structure of the first hole position being matched with the structure of the positioning column pin, and the positioning column pin being arranged in the first hole position; the second hole position is provided with an internal thread, the nut is provided with threads both inside and outside, the nut is matched with the thread of the second hole position, and the pressure rod is matched with the thread of the nut.

9. The pipeline plugging device according to claim 1, characterized in that: The positioning pin includes an inner end, a main body and an outer end which are coaxially arranged, the inner end abuts against the pipe plug, the first sealing groove is arranged on the main body, and the outer end is provided with an external thread.

10. The pipeline plugging device according to claim 1, characterized in that: A first auxiliary hole is provided on the top of the pipe plug; and / or, a second auxiliary hole is provided on the outer end surface of the positioning pin; and / or, a third auxiliary hole is provided on the outer end surface of the pressure rod.

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