A pipeline pressure plugging control device and method

Abstract

The present invention discloses a pipeline pressure plugging control device and method, comprising: a plugging component, wherein the plugging component is used to be inserted into a pipeline; the plugging component comprises a bracket, a first airbag and a second airbag; a controller, wherein the controller is used to control the first airbag and / or the second airbag to shrink or expand; the first airbag is arranged around the peripheral wall of the bracket; the bracket comprises two relatively arranged plugging disks, a connected first hollow structure is arranged between the two plugging disks, and the two plugging disks are both provided with a pressure regulating hole, which is connected to the first hollow structure and is used to adjust the pressure on both sides of the plugging component; the second airbag is arranged in the first hollow structure; when the second airbag shrinks, a gap is formed between the second airbag and the pressure regulating hole, and the pressure on both sides of the plugging component is balanced in the pipeline through the pressure regulating hole, and at the same time, the first airbag is tightly matched with the inner wall of the pipeline and the bracket, so that the plugging component is fixed relative to the pipeline, thereby avoiding the first connecting member and the first connecting plate from colliding with the pipeline and causing damage to the pipeline.

Description

Technical Field

[0001] The present invention relates to the technical field of pipeline equipment, and in particular to a pipeline pressure plugging control device and method. Background Art

[0002] With the rapid development of industries such as petrochemicals and natural gas transportation, the pipeline systems in large industrial facilities have become increasingly complex and large. Many process flows in these industries require continuous operation, and any downtime for maintenance will result in huge economic losses. Therefore, in order to reduce downtime and improve production efficiency, pressure plugging technology came into being.

[0003] The existing plugging device needs to install a pressure-balancing valve structure on the pipeline. The plugging head can only be lifted and recovered after the liquid or gas pressure at both ends of the plugging head is balanced through the valve. However, the installation of the valve structure requires drilling holes in the pipeline, which will damage the pipeline and affect the safety of pipeline transportation. Another existing technology does not require the installation of a valve structure. An inflatable airbag is set on the peripheral wall of the plugging head. The airbag expands to block the pipeline and contracts to balance the pressure in the pipeline. However, when the airbag contracts, the side with high pipeline pressure exerts a large driving force on the plugging head, driving the plugging head to move, so that the connection mechanism with the plugging head may collide with the pipe wall of the pipeline, causing damage to the pipe wall. Summary of the invention

[0004] The object of the present invention is to overcome at least one defect of the prior art and to provide a pipeline pressure plugging control device, method and system with simple structure, high safety and convenience.

[0005] The present application provides a pipeline pressure plugging control device, comprising: A plugging assembly, the plugging assembly is used to be inserted into a pipeline; the plugging assembly comprises a bracket, a first airbag and a second airbag; The first airbag is arranged around the peripheral wall of the bracket; The support comprises two blocking discs arranged opposite to each other, a first hollow structure connected to each other is arranged between the two blocking discs, and both blocking discs are provided with a pressure regulating hole, which is connected to the first hollow structure and is used to adjust the pressure on both sides of the blocking assembly; The second airbag is disposed in the first hollow structure; When the sealing assembly seals the pipeline, the first airbag expands and fits tightly with the pipeline and the bracket, and the second airbag expands to close the pressure regulating hole; when the sealing assembly unblocks the pipeline, the second airbag contracts, and a gap is formed between the second airbag and the pressure regulating hole. The first airbag expands to fix the sealing assembly, and after the pressure of the pipelines on both sides of the sealing assembly is balanced through the pressure regulating hole, the first airbag contracts.

[0006] Furthermore, the two sealing disks are provided with a plurality of arc-shaped pressure regulating holes which are arranged opposite to each other, and the plurality of pressure regulating holes are evenly arranged around the axis of the sealing disks.

[0007] Furthermore, an annular groove is provided on a peripheral wall of the bracket, the second airbag is partially provided in the annular groove, and the annular groove limits the second airbag.

[0008] Furthermore, it also includes a first driving mechanism, a first connecting member and a first connecting plate, the first driving mechanism is connected to the first connecting member, the first connecting member is connected to the first connecting plate, and the first connecting plate is rotatably connected to the blocking assembly.

[0009] Furthermore, a guide portion is provided on one side of the bracket away from the first connecting plate, a guide wheel 3 is provided on one side of the guide portion for sliding in the pipe, and a bar magnet is provided on the other side of the guide portion for absorbing iron filings in the pipe.

[0010] Furthermore, it also includes a sealing device, which includes a first sealing component and a cover body, the first sealing component includes a first sealing tube, one end of the first sealing tube is connected to the pipeline, and the other end is connected to the cover body, the first sealing tube includes a first locking portion arranged around the circumferential wall of the first sealing tube, the first locking portion includes a guide channel, the guide channel is provided with a horizontal portion and an inclined portion, the cover body includes a second locking portion, the second locking portion includes a sliding portion, the sliding portion is slidably connected to the guide channel, so that the first sealing component and the cover body are tightly matched.

[0011] Furthermore, the guide channel is a slide, which includes a first slide and a second slide that are connected, the first slide extends obliquely in a direction away from the cover body, the second slide is connected to an end of the first slide away from the cover body and is horizontally arranged, and the second locking portion is provided with a sliding column facing the slide, and the sliding column slides from the first slide to the second slide.

[0012] Furthermore, the guide channel includes a guide rod, and the guide rod includes a first guide rod and a second guide rod, the first guide rod extends obliquely in a direction away from the cover body, the second guide rod is connected to an end of the first guide rod away from the cover body and is horizontally arranged, and the second locking portion is provided with a guide ring, and the guide ring slides from the first guide rod to the second guide rod.

[0013] The present application provides a pipeline pressure plugging control method, comprising: The two plugging components are inserted into the pipeline relative to each other; The first airbag and the second airbag are expanded, and the blocking assembly seals the pipeline; The second airbag contracts, the pipes on both sides of the plugging assembly balance the pressure through the pressure regulating hole, and the first airbag expands, so that the plugging assembly is fixed relative to the pipe; After the pipeline pressures on both sides of the blocking component are balanced, the first airbag contracts.

[0014] The present application also provides a pipeline pressure plugging control system, comprising: A sealing unit, wherein the sealing unit is arranged outside the pipeline and is fixedly connected to the pipeline; A plugging unit, used to pass through the sealing unit to seal the pipeline; the plugging unit includes a first plugging module, a second plugging module and a control unit; The first blocking module and the second blocking module expand, so that the blocking unit seals the pipeline and the blocking unit is fixed to the pipeline; The second plugging module contracts, and the pressure on both sides of the plugging unit in the pipeline is balanced by the second plugging unit, while the first sealing module continues to expand, so that the plugging unit is fixed in the pipeline; after the pressure on both sides of the plugging unit is balanced, the first plugging module contracts; A control unit is electrically connected to the first blocking module and the second blocking module.

[0015] According to the matching structure of the first airbag, the pipeline and the bracket, and the matching structure of the second airbag and the pressure regulating hole of the bracket, the second airbag contracts and a gap is formed between the second airbag and the pressure regulating hole. The pressure on both sides of the plugging assembly is balanced in the pipeline through the pressure regulating hole. At the same time, the first airbag closely matches the inner wall of the pipeline and the bracket to fix the plugging assembly relative to the pipeline, thereby preventing the plugging assembly from moving and causing the first connecting piece and the first connecting plate to collide with the pipeline and cause damage to the pipeline.

[0016] In addition, the guide part of the present invention is provided with a bar magnet, which can absorb iron filings scattered when drilling holes on the pipeline, preventing the iron filings from being pushed into the pipeline system by the transported materials in the pipeline and causing damage to the pipeline system, while preventing the iron filings from causing wear to the inflated airbag.

[0017] In addition, the guide channel of the first sealing tube of the present invention and the sliding part of the second locking part are provided with a sliding matching structure, and the horizontal part and the inclined part structure provided in the guide channel can make the first sealing assembly and the cover body closely matched, easy to operate, high firmness and high safety. Further, the limit pin provided in the present invention cooperates with the first limit hole and the second limit hole, and the limit pin can limit the second locking part inserted into the first locking part to prevent the second locking part from falling out of the first locking part. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for describing the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention.

[0019] Figure 1 It is an overall schematic diagram of the pipeline pressure plugging device of the present invention; Figure 2 It is a structural schematic diagram of the plugging assembly of the present invention; Figure 3 is a cross-sectional view of the pipe plugging assembly of the present invention; Figure 4 is a schematic structural diagram of a first connecting member of the present invention; Figure 5 is a schematic structural diagram of the first connecting plate of the present invention; Figure 6 It is a structural schematic diagram of the bar magnet of the present invention; Figure 7 is an overall schematic diagram of the sealing device of the present invention; Figure 8 is a schematic structural diagram of a first sealing assembly of the present invention; Fig. 9 It is a structural schematic diagram of the cover body of the present invention; Fig.10 It is a structural schematic diagram of the limit pin of the present invention.

[0020] Reference numerals include: Plugging component 1; Bracket 11; blocking plate 111; pressure regulating hole 1111; third connecting plate 1112; first hollow structure 112; annular groove 113; A first airbag 12; a second airbag 13; First connecting member 114; first connecting plate 1141; second connecting plate 1142; First connecting plate 115; arc groove 1151; Guide portion 116; bar magnet 1161; reinforcing rib 1162; Sealing device 2; first sealing assembly 21; first locking portion 211; guide channel 2111; inclined portion 2112; horizontal portion 2113; first limiting hole 2114; second locking portion 212; sliding portion 2121; second limiting hole 2122; first sealing pipe 25; plug-in portion 251; first sealing disk 252; groove 253; sealing plate 26; Cover body 22; second sealing disk 221; second sealing portion 222; connecting pipe 223; Limit pin 23; Sealing ring 24; Guide wheel 3; Pipeline 4. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0022] It should be noted that all directional indications in the embodiments of the present application (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0023] In addition, the descriptions of "first", "second", etc. in this application are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0024] like Figure 1 As shown, this embodiment provides a pipeline pressure plugging control device, which is used for pressure maintenance of natural gas and other pipelines. The pipeline pressure plugging device includes a plugging mechanism and a sealing device 2, the sealing device 2 is welded on the pipeline, and a hole is opened in the sealing device 2 for the pipeline; the plugging mechanism partially passes through the sealing device 2 and enters the pipeline to plug the pipeline.

[0025] like Figures 1 to 3 As shown, the blocking mechanism includes a blocking component 1, and the blocking component 1 is used to be inserted into a pipe 4; the blocking component 1 includes a bracket 11, a first airbag 12 and a second airbag 13.

[0026] The first airbag 12 has a ring-shaped cross section, and the first airbag 12 is arranged around the peripheral wall of the bracket 11; preferably, the peripheral wall of the bracket 11 is provided with an annular groove 113, and the second airbag 13 is partially arranged in the annular groove 113, and the annular groove 113 limits the second airbag 13. Further, the cross section of the annular groove is square. Of course, it can also be elliptical, circular or other polygonal.

[0027] The bracket 11 has a circular cross section. The bracket 11 includes two sealing disks 111 that are arranged opposite to each other. A first hollow structure 112 that is connected is arranged between the two sealing disks 111. The two sealing disks 111 are both provided with pressure regulating holes 1111. The pressure regulating holes 1111 are connected to the first hollow structure 112 and are used to adjust the pressure on both sides of the sealing assembly 1. Preferably, the two sealing disks 111 are provided with a plurality of arc-shaped pressure regulating holes 1111 that are arranged opposite to each other. The plurality of pressure regulating holes 1111 are evenly arranged around the axis of the sealing disk 111. Of course, the pressure regulating holes 1111 may also be circular or other polygonal shapes. The plurality of pressure regulating holes 1111 may not be evenly arranged around the axis of the sealing disk 111. Preferably, the diameter of the bracket 11 is smaller than the diameter of the pipe 4.

[0028] The second airbag 13 has a circular cross section, and the second airbag 13 is arranged in the first hollow structure 112. Preferably, the second hollow structure 112 has a square cross section. Of course, a circular or other polygonal shape may also be used.

[0029] A controller (not shown), the controller is used to control the first airbag 12 and / or the second airbag 13 to shrink or expand; When the sealing component 1 blocks the pipeline 4, the first airbag 12 expands and fits tightly with the pipeline 4 and the bracket 11, and the second airbag 13 expands and closes the pressure regulating hole 1111; when the sealing component 1 unblocks the pipeline 4, the second airbag 13 contracts, and a gap is formed between the second airbag 13 and the pressure regulating hole 1111. The first airbag 12 expands to fix the sealing component 1, and after the pressure of the pipelines 4 on both sides of the sealing component 1 is balanced through the pressure regulating hole 1111, the first airbag 12 contracts.

[0030] In this embodiment, the first airbag 12 cooperates with the structure of the pipe 4 and the bracket 11, and the second airbag 13 cooperates with the pressure regulating hole 1111 of the bracket 11. The second airbag 13 shrinks, and a gap is formed between the second airbag 13 and the pressure regulating hole 1111. The pressure on both sides of the sealing component 1 is balanced in the pipe 4 through the pressure regulating hole 1111. At the same time, the first airbag 12 cooperates closely with the inner wall of the pipe 4 and the bracket 11, so that the sealing component 1 is fixed relative to the pipe 4, thereby preventing the sealing component from moving, causing the first connecting piece 114 and the first connecting plate 115 to collide with the pipe 4, causing damage to the pipe 4.

[0031] like Figure 1As shown, the plugging assembly 1 further includes a first driving mechanism (not shown), a first connecting member 114 and a first connecting plate 115, wherein the first driving mechanism is connected to the first connecting member 114, the first connecting member 114 is connected to the first connecting plate 115, and the first connecting plate 115 is rotatably connected to the plugging assembly 1. Further, after the plugging assembly 1 slides into the pipeline 4, the first connecting rod passes through the sealing device 2 and extends out to be connected to the external first driving mechanism.

[0032] Specifically, Figure 4 As shown, the first connecting member 114 is rod-shaped, and a first connecting plate 1141 is provided at one end of the first connecting member 114. Two second connecting plates 1142 are oppositely provided on the side of the first connecting plate 1141 facing the first connecting plate 115. The first connecting plate 115 is arranged between the two second connecting plates 1142 and is bolted to the two second connecting plates 1142.

[0033] like Figure 5 As shown, the first connecting plate 115 is in the shape of a plate, and the first connecting plate 115 is provided with a penetrating arc groove 1151, and the two ends of the arc groove 1151 are far away from the bracket 11, and the bracket 11 is close to the blocking disk 111 of the first connecting plate 115 and two third connecting plates 1112 are relatively arranged, and the first connecting plate 115 is located between the two third connecting plates 1112, and the two third connecting plates 1112 are rotatably connected to the first connecting plate 115 through the arc groove 1151.

[0034] like Figure 2 , 6 As shown, a guide portion 116 is provided on one side of the bracket 11 away from the first connecting plate 115, which is in the shape of a plate. Two guide wheels 3 are provided on one side of the guide portion 116 for sliding in the pipe 4, and a bar magnet 1161 is provided on the other side of the guide portion 116 for absorbing iron filings in the pipe 4. The guide portion 116 of this embodiment is provided with a bar magnet 1161, which can absorb iron filings scattered when drilling holes on the pipe 4, so as to prevent the iron filings from being pushed into the pipe 4 system by the transported materials in the pipe 4, causing damage to the pipe 4 system, and at the same time prevent the iron filings from causing wear to the inflated airbag. Of course, the bar magnet can also be circular or other polygonal.

[0035] Further, such as Figure 2 As shown, two reinforcing ribs 1162 are correspondingly arranged on both sides of the guide portion 116 .

[0036] like Figure 7As shown, the sealing device 2 includes a first sealing component 21 and a cover body 22, the first sealing component 21 includes a first sealing tube 25, one end of the first sealing tube 25 is connected to the pipe 4, and the other end is connected to the cover body 22, the first sealing tube 25 includes a first locking portion 211 arranged around the peripheral wall of the first sealing tube 25, the first locking portion 211 includes a guide channel 2111, the guide channel 2111 is provided with a horizontal portion 2113 and an inclined portion 2112, the cover body 22 includes a second locking portion 212, the second locking portion 212 includes a sliding portion 2121, the sliding portion 2121 is slidably connected to the guide channel 2111, so that the first sealing component 21 and the cover body 22 are tightly matched. This embodiment adopts the structure of sliding fit between the guide channel 2111 of the first sealing tube 25 and the sliding part 2121 of the second locking part 212, and the structure of the horizontal part 2113 and the inclined part 2112 provided in the guide channel 2111, so that the first sealing assembly 21 and the cover body 22 can be closely matched, which is convenient to operate, has high firmness and high safety. Of course, as a relatively inferior embodiment, the first locking part 211 and the second locking part 212 are threadedly connected.

[0037] A preferred embodiment of the cooperation between the first locking portion 211 and the second locking portion 212 is that the guide channel 2111 is a slide, and the slide includes a first slide and a second slide that are connected, the first slide extends obliquely in a direction away from the cover body 22, the second slide is connected to an end of the first slide away from the cover body 22 and is horizontally arranged, and the second locking portion 212 is provided with a sliding column facing the slide, and the sliding column slides from the first slide to the second slide.

[0038] Another preferred embodiment of the cooperation between the first locking portion 211 and the second locking portion 212 is that the guide channel 2111 is a guide rod, and the guide rod includes a first guide rod and a second guide rod, the first guide rod extends obliquely in a direction away from the cover body 22, the second guide rod is connected to an end of the first guide rod away from the cover body 22 and is horizontally arranged, and the second locking portion 212 is provided with a guide ring, and the guide ring slides from the first guide rod to the second guide rod.

[0039] Further, such as Figure 8 As shown, the first sealing tube 25 is provided with a hollow structure with upper and lower openings for passing through the blocking assembly 1. The first sealing tube 25 is provided with a first sealing disk 252 around the peripheral wall, and the first sealing disk 252 is provided with the multiple first locking portions 211 at intervals in the circumferential direction.

[0040] like Figure 8As shown, the first sealing assembly 21 also includes a sealing plate 26, and the first sealing tube 25 includes an inserting portion 251. The inserting portion 251 is provided with a second hollow structure with an opening on one side. The sealing plate 26 is inserted into the second hollow structure and tightly fits with the first sealing tube 25 to seal the first sealing tube 25.

[0041] like Fig. 9 As shown, the cover body 22 includes a second sealing portion 222, a second sealing disk 221, a second locking portion 212 and a connecting pipe 223. The second sealing portion 222 is in the shape of a hollow cylinder, and the second sealing portion 222 is matched with the hollow structure shape of the first sealing pipe member 25 and is correspondingly arranged for passing through the blocking assembly 1; the second sealing portion 222 is provided with a second sealing disk 221 around the peripheral wall, and the second sealing disk 221 is correspondingly arranged with the first sealing disk 252; a plurality of second locking portions 212 are circumferentially arranged on the side wall of the second sealing disk 221; the second sealing portion 222 is provided with a connecting pipe 223 away from the second sealing disk 221, which is docked with another connecting pipe and is used to transport substances in the pipeline 4 when the pipeline 4 is blocked.

[0042] like Figure 7 , 10 As shown, the sealing device 2 further includes a limiting pin 23, the first locking portion 211 is provided with a plurality of first limiting holes 2114, and the first limiting holes 2114 are located at the horizontal portion 2113 of the first locking portion 211, and the second sealing disk 221 is provided with a plurality of second limiting holes 2122, the first limiting holes 2114 and the second limiting holes 2122 are arranged opposite to each other, and are used to insert the limiting pin 23 to limit the second locking portion 212. Of course, the first limiting hole 2114 can also be located at the inclined portion 2112 of the first locking portion 211, but it will exert pressure on the limiting pin 23, which is not easy to install.

[0043] Preferably, Figure 7 As shown, a sealing ring 24 is disposed between the first sealing component 21 and the cover body 22, and the sealing ring 24 is tightly matched with the first sealing component 21 and the cover body 22. Specifically, a groove 253 is disposed on the side of the first sealing disc 252 facing the cover body 22, and the groove 253 is annular. The sealing ring 24 is disposed in the groove 253, so as to prevent the substance in the sealing device 2 from leaking through the gap between the first sealing component 21 and the cover body 22.

[0044] The working principle of this embodiment is as follows: The sealing device 2 is fixedly welded to the outside of the pipe 4, a hole is opened in the sealing assembly 1 for the pipe 4, and the two plugging assemblies 1 are relatively inserted into the pipe 4. Specifically, the first driving mechanism drives the plugging assembly 1 to pass through the sealing device 2 and enter the pipe 4, and the guide wheel 3 contacts the bottom inner wall of the pipe 4, and the guide wheel 3 slides in the pipe 4, and the plugging assembly 1 rotates at the same time until the plugging assembly 1 rotates 90°, at which time the two plugging assemblies 1 are relatively. When the plugging assembly 1 blocks the pipe 4, the controller controls the first airbag 12 to expand and fit closely with the pipe 4 and the bracket 11, and the controller controls the second airbag 13 to expand and close the pressure regulating hole 1111; when the plugging assembly 1 unblocks the pipe 4, the controller controls the second airbag 13 to shrink, and a gap is formed between the second airbag 13 and the pressure regulating hole 1111. The first airbag 12 expands to fix the plugging assembly 1. After the pressure of the pipes 4 on both sides of the plugging assembly 1 is balanced through the pressure regulating hole 1111, the first airbag 12 shrinks when the plugging assembly 1 unblocks the pipe 4. The first driving mechanism drives the plugging assembly 1 to withdraw from the pipe. The first sealing pipe 25 of the sealing device 2 is sealed with a sealing cover.

[0045] This embodiment also provides a method for plugging a pipeline 4 under pressure, comprising: The two plugging components 1 are inserted into the pipeline 4 relative to each other; The first airbag 12 and the second airbag 13 are inflated, and the blocking assembly 1 seals the pipeline 4; The second airbag 13 contracts, the pipes 4 on both sides of the plugging component 1 balance the pressure through the pressure regulating hole 1111, and the first airbag 12 expands, so that the plugging component 1 is fixed relative to the pipe 4; After the pressures of the pipes 4 on both sides of the blocking component 1 are balanced, the first airbag 12 contracts.

[0046] This embodiment also provides a pipeline 4 pressure plugging control system, including: A sealing unit, wherein the sealing unit is arranged outside the pipeline and is fixedly connected to the pipeline; A plugging unit, used to pass through the sealing unit to seal the pipeline; the plugging unit includes a first plugging module, a second plugging module and a control unit; The first blocking module and the second blocking module expand, so that the blocking unit seals the pipeline and the blocking unit is fixed to the pipeline; The second plugging module contracts, and the pressure on both sides of the plugging unit in the pipeline is balanced by the second plugging unit, while the first sealing module continues to expand, so that the plugging unit is fixed in the pipeline; after the pressure on both sides of the plugging unit is balanced, the first plugging module contracts; A control unit is electrically connected to the first blocking module and the second blocking module.

[0047] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0048] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A pipeline pressure plugging control device, characterized in that: include, A plugging assembly, the plugging assembly is used to be inserted into a pipeline; the plugging assembly comprises a bracket, a controller, a first airbag and a second airbag; The first airbag is arranged around the peripheral wall of the bracket; The support comprises two blocking discs arranged opposite to each other, a connected and sealed first hollow structure is arranged between the two blocking discs, and both of the two blocking discs are provided with a pressure regulating hole, which is connected to the first hollow structure and is used to adjust the pressure on both sides of the blocking assembly; The second airbag is disposed in the first hollow structure; A controller, the controller is used to control the first airbag and / or the second airbag to shrink or expand; When the sealing assembly seals the pipeline, the first airbag expands and fits tightly with the pipeline and the bracket, and the second airbag expands to close the pressure regulating hole; when the sealing assembly unblocks the pipeline, the second airbag contracts, and a gap is formed between the second airbag and the pressure regulating hole. The first airbag expands to fix the sealing assembly, and after the pressure of the pipelines on both sides of the sealing assembly is balanced through the pressure regulating hole, the first airbag contracts.

2. A pipeline pressure plugging control device according to claim 1, characterized in that: The two sealing disks are provided with a plurality of arc-shaped pressure regulating holes which are arranged opposite to each other, and the plurality of pressure regulating holes are evenly arranged around the axis of the sealing disks.

3. A pipeline pressure plugging control device according to claim 1, characterized in that: An annular groove is arranged on the peripheral wall of the bracket, the second airbag is partially arranged in the annular groove, and the annular groove limits the second airbag.

4. A pipeline pressure plugging control device according to claim 1, characterized in that: It also includes a first driving mechanism, a first connecting member and a first connecting plate, wherein the first driving mechanism is connected to the first connecting member, the first connecting member is connected to the first connecting plate, and the first connecting plate is rotatably connected to the blocking assembly.

5. A pipeline pressure plugging control device as claimed in claim 4, characterized in that: A guide portion is provided on one side of the bracket away from the first connecting plate, a guide wheel 3 is provided on one side of the guide portion for sliding in the pipe, and a bar magnet is provided on the other side of the guide portion for absorbing iron filings in the pipe.

6. A pipeline pressure plugging control device according to claim 1, characterized in that: It also includes a sealing device, which includes a first sealing component and a cover body, the first sealing component includes a first sealing pipe, one end of the first sealing pipe is connected to the pipeline, and the other end is connected to the cover body, the first sealing pipe includes a first locking part arranged around the peripheral wall of the first sealing pipe, the first locking part includes a guide channel, the guide channel is provided with a horizontal part and an inclined part, the cover body includes a second locking part, the second locking part includes a sliding part, the sliding part is slidably connected to the guide channel, so that the first sealing component and the cover body are tightly matched.

7. A pipeline pressure plugging control device as claimed in claim 6, characterized in that: The guide channel is a slide, which includes a first slide and a second slide that are connected. The first slide extends obliquely in a direction away from the cover body, and the second slide is connected to an end of the first slide away from the cover body and is horizontally arranged. The second locking portion is provided with a sliding column facing the slide, and the sliding column slides from the first slide to the second slide.

8. A pipeline pressure plugging control device as claimed in claim 6, characterized in that: The guide channel includes a guide rod, and the guide rod includes a first guide rod and a second guide rod. The first guide rod extends obliquely in a direction away from the cover body, and the second guide rod is connected to an end of the first guide rod away from the cover body and is horizontally arranged. The second locking portion is provided with a guide ring, and the guide ring slides from the first guide rod to the second guide rod.

9. A pipeline pressure plugging control method, characterized in that: include, The two plugging components are inserted into the pipeline relative to each other; The first airbag and the second airbag are expanded, and the blocking assembly seals the pipeline; The second airbag contracts, the pipes on both sides of the plugging assembly balance the pressure through the pressure regulating hole, and the first airbag expands, so that the plugging assembly is fixed relative to the pipe; After the pipeline pressures on both sides of the blocking component are balanced, the first airbag contracts.

10. A pipeline pressure plugging control system, characterized in that: include, A sealing unit, wherein the sealing unit is arranged outside the pipeline and is fixedly connected to the pipeline; A plugging unit, used to pass through the sealing unit to seal the pipeline; the plugging unit includes a first plugging module, a second plugging module and a control unit; The first blocking module and the second blocking module expand, so that the blocking unit seals the pipeline and the blocking unit is fixed to the pipeline; The second plugging module contracts, and the pressure on both sides of the plugging unit in the pipeline is balanced by the second plugging unit, while the first sealing module continues to expand, so that the plugging unit is fixed in the pipeline; after the pressure on both sides of the plugging unit is balanced, the first plugging module contracts; A control unit is electrically connected to the first blocking module and the second blocking module.

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