A compact pig

Abstract

The application relates to the technical field of compact pigging, and discloses a compact pig, which comprises a shell, a bypass valve is fixedly arranged at the side wall of the shell, a main ball valve one is fixedly arranged at the top of the side wall of the shell, a main ball valve two is fixedly arranged at the bottom of the side wall of the shell, a drainage valve is fixedly arranged at the bottom of the side wall of the shell, a purification valve is fixedly arranged at the side wall of the shell, a quick-opening blind plate is rotatably arranged at the side wall of the shell, a pigging shell is slidably arranged at the inner wall of the shell, when the pigging shell moves, the impeller is subjected to the thrust of liquid, rotates, drives the rotating shaft and the rotating block to synchronously rotate, when the rotating block rotates, the cleaning plates are forced to move, when the rotating block rotates to a certain angle, the thrust on the two cleaning plates is lost, the rotating blocks continuously rotate, the cleaning plates are alternately contacted with the pipe wall, the contact pressure is lower, the friction is smaller, under the same pushing pressure difference, the power is more easily maintained, and the pigging shell can be kept moving for a longer time.

Description

Technical Field

[0001] This invention relates to the field of compact pipeline pigging technology, specifically to a compact pipeline pigging device. Background Technology

[0002] The compact pipeline pig is a streamlined and compact pipeline maintenance device. Based on its compact integrated design, it is suitable for complex pipeline conditions such as narrow diameter, bends, and diameter changes. It can perform scale removal, impurity removal, liquid drainage, and testing in various pipelines such as oil and gas, water supply and drainage, and chemical pipelines. It features strong passability, convenient installation, low operating resistance, and wide applicability. It can efficiently complete pipeline cleaning and maintenance work, and significantly improve pipeline transportation efficiency and operational safety.

[0003] When a large amount of silt, impurities, sewage, or viscous media accumulates inside the pipeline for a long time, the dirt at the front end of the pig will continue to accumulate, the resistance will continue to increase, and the movement will gradually slow down. If the amount of dirt far exceeds the pushing capacity of the pig, it will eventually cause the pig to be unable to move at all, forming a blockage. After the pig is blocked, the upstream pressure will continue to rise. If pressure reduction measures are not taken in time, it may cause overpressure, which may lead to pipeline rupture and equipment damage in severe cases. The following solutions are proposed to address the above problems. Summary of the Invention

[0004] To solve the above-mentioned technical problems, the present invention provides a compact pigging device, including a housing, a bypass valve fixedly installed on the side wall of the housing, a main ball valve one fixedly installed on the top of the side wall of the housing, a main ball valve two fixedly installed on the bottom of the side wall of the housing, a drain valve fixedly installed on the bottom of the side wall of the housing, a purge valve fixedly installed on the side wall of the housing, a quick-opening blind flange rotatably installed on the side wall of the housing, and a pigging shell slidably installed on the inner wall of the housing, and further including: The braking mechanism is rotatably mounted on the inner wall of the pigging shell; The braking mechanism includes a rotating shaft rotatably connected to the inner wall of the pigging shell, and an impeller is fixedly connected to the side wall of the rotating shaft. The anti-fouling mechanism is rotatably mounted on the outer wall of the braking mechanism. The anti-fouling mechanism includes a scraper that is fixedly connected to the top of the outer wall of the rotating shaft; The passive mechanism is slidably disposed on the side wall of the pigging shell; The passive mechanism includes a trigger ring that is slidably connected to the side wall of the pigging shell, and a thrust block that is slidably connected to the inner wall of the trigger ring.

[0005] Preferably, the braking mechanism includes: Rotating assembly, the rotating assembly is rotatably mounted on the inner wall of the pig shell; The cleaning component is slidably disposed on the inner wall of the cleaning housing; The rotating component applies a thrust to the cleaning component when it rotates.

[0006] Preferably, the antifouling mechanism includes: The scraping component is rotatably mounted on the outer wall of the rotating component; The delay component is slidably installed on the inner wall of the cleaning component; During the movement of the cleaning component, the delay component moves synchronously.

[0007] Preferably, the passive mechanism includes: The force-bearing component is slidably disposed on the side wall of the pig shell; Support assembly, which is slidably disposed on the inner wall of the pig shell; When the force-bearing component moves, it applies a thrust to the supporting component.

[0008] Preferably, the rotating assembly includes a rotating block fixedly connected to the side wall of the rotating shaft; During the movement of the pigging shell, the impeller is pushed by the liquid and rotates, and the rotating shaft rotates synchronously.

[0009] Preferably, the cleaning assembly includes a cleaning plate slidably connected to the inner wall of the cleaning tube housing, and a spring is fixedly connected to the bottom of the outer wall of the cleaning plate; When the rotating block rotates, it exerts a pushing force on the cleaning plates on the upper and lower sides, forcing the cleaning plates to move under the force. After moving, the cleaning plates come into contact with the inner wall of the pipe, and the impurities on the inner wall of the pipe are scraped off by the cleaning plates.

[0010] Preferably, the scraping assembly includes a filter screen fixedly connected to the outer wall of the pig housing; In this process, impurities inside the pipe continuously come into contact with the surface of the filter screen, and the rotating shaft drives the scraper to rotate synchronously when it rotates, generating a pushing force on the impurities on the surface of the filter screen.

[0011] Preferably, the delay component includes an arc-shaped block slidably connected to the inner wall of the cleaning plate, and a spring is fixedly connected to the side wall of the arc-shaped block; During the resetting process of the cleaning plate, the arc-shaped block moves synchronously. When the arc-shaped block moves downward, it is pushed by the protruding block of the cleaning shell and moves. When the arc-shaped block slowly extends out of the surface of the cleaning plate, the impurities on the surface of the cleaning plate come into contact with the arc-shaped surface of the arc-shaped block, which slows down the speed at which the impurities pass through the gap between the cleaning plate and the pipe wall.

[0012] Preferably, the force-bearing component includes a spring piece fixedly connected to the side wall of the trigger ring; Among them, impurities exert a thrust on the trigger ring, causing the trigger ring to move under the force, and the thrust block moves accordingly.

[0013] Preferably, the support assembly includes a push rod slidably connected to the inner wall of the pigging housing, and a spring piece is fixedly connected to the outer wall of the push rod; When the thrust block moves, it comes into contact with the inclined surface of the push rod and generates a thrust on the push rod, forcing the push rod to move under force, which in turn generates a thrust on the cleaning plate, causing the cleaning plate to move under force, and the moved cleaning plate comes into contact with the pipe wall.

[0014] The present invention has the following beneficial effects: During the movement of the cleaning shell, the impeller is pushed by the liquid and rotates, driving the rotating shaft and rotating blocks to rotate synchronously. When the rotating blocks rotate, they force the cleaning plates to move. When the rotating blocks rotate to a certain angle, they lose the pushing force on the cleaning plates on both sides and complete the reset. With the continuous rotation of several rotating blocks, several cleaning plates take turns contacting the pipe wall. Through the above-mentioned components, the contact pressure is lower and the friction is smaller. Under the same pushing pressure difference, it is easier to maintain power and allow the cleaning shell to maintain movement for a longer time.

[0015] During the movement of the cleaning shell, the filter screen moves along with it. As the filter screen moves, impurities inside the pipe continuously come into contact with the surface of the filter screen. At this time, when the rotating shaft rotates, it drives the scraper to rotate synchronously, so that the scraper continuously contacts the surface of the filter screen during rotation, generating a pushing force on the impurities on the surface of the filter screen, preventing the accumulation of impurities and the impeller from gradually losing liquid thrust and being unable to rotate. The above-mentioned components scrape off the impurities, preventing the impurities from disrupting the dynamic balance of the impeller and improving the stability of the impeller.

[0016] When the cleaning plate loses the thrust of the rotating block, the cleaning plate begins to reset under the elastic force of the spring. During the reset process, the arc-shaped block moves synchronously. When the arc-shaped block moves downward, it is pushed by the protruding block of the cleaning shell, forcing the arc-shaped block to slowly extend out of the surface of the cleaning plate. The impurities on the surface of the cleaning plate come into contact with the arc-shaped surface of the arc-shaped block. Due to the arc-shaped surface of the arc-shaped block, the speed at which the impurities pass through the gap between the cleaning plate and the pipe wall is slowed down when they come into contact with it. Through the above-mentioned components, when the cleaning plate moves, it generates a counter-thrust force on the impurities on the surface of the cleaning plate, effectively reducing the speed at which the impurities pass through the gap, thereby reducing the amount of impurities entering.

[0017] The impurities of this invention exert a thrust on the trigger ring, causing the trigger ring to move under force. The thrust block moves accordingly, and as it moves, it contacts the surface of the push rod. Under the action of the spring inside the trigger ring, the thrust block moves relative to the trigger ring. As the thrust block moves, it contacts the inclined surface of the push rod and exerts a thrust on the push rod, forcing the push rod to move under force. This thrust exerts a thrust on the cleaning plate, causing the cleaning plate to move under force. After moving, the cleaning plate contacts the pipe wall. At this point, the cleaning plate is no longer affected by the thrust of the rotating block. Through the above components, the cleaning plate is forced into contact with the pipe wall, directly cutting off the path of impurities flowing into the cleaning shell and maintaining the mobility of the cleaning shell. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic cross-sectional view of the overall structure of the present invention; Figure 3 This is a schematic cross-sectional view of part of the structure of the present invention; Figure 4 This is a schematic cross-sectional view of the rotating component of the present invention; Figure 5 This is a schematic cross-sectional view of the cleaning component of the present invention; Figure 6 This is a cross-sectional schematic diagram of the scraping component of the present invention; Figure 7 This is a schematic diagram of some parts in the delay component of the present invention; Figure 8 This is a schematic cross-sectional view of the delay component of the present invention; Figure 9 This is a schematic cross-sectional view of the force-bearing component of the present invention; Figure 10 This is a cross-sectional schematic diagram of the support component of the present invention.

[0020] The attached diagram lists the components represented by each number as follows: In the diagram: 1. Braking mechanism; 11. Rotating assembly; 12. Cleaning assembly; 13. Housing; 14. Bypass valve; 15. Main ball valve one; 16. Main ball valve two; 17. Drain valve; 18. Purification valve; 19. Quick-opening blind flange; 20. Cleaning housing; 111. Rotating shaft; 112. Impeller; 113. Rotating block; 121. Cleaning plate; 122. Spring; 2. Anti-fouling mechanism; 21. Scraping assembly; 22. Delaying assembly; 211. Scraper; 212. Filter screen; 221. Arc block; 222. Spring one; 3. Passive mechanism; 31. Force-bearing assembly; 32. Support assembly; 311. Trigger ring; 312. Thrust block; 313. Spring; 321. Push rod; 322. Spring one. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Example 1, please refer to Figures 1-9 This invention relates to a compact pigging device, comprising a housing 13, a bypass valve 14 fixedly mounted on the side wall of the housing 13, a main ball valve 15 fixedly mounted on the top of the side wall of the housing 13, a main ball valve 16 fixedly mounted on the bottom of the side wall of the housing 13, a drain valve 17 fixedly mounted on the bottom of the side wall of the housing 13, a purification valve 18 fixedly mounted on the side wall of the housing 13, a quick-opening blind flange 19 rotatably mounted on the side wall of the housing 13, and a pigging shell 20 slidably mounted on the inner wall of the housing 13. It also includes: Braking mechanism 1 is rotatably mounted on the inner wall of the pigging shell 20; The braking mechanism 1 includes a rotating shaft 111 rotatably connected to the inner wall of the pigging shell 20, and an impeller 112 is fixedly connected to the side wall of the rotating shaft 111. Anti-fouling mechanism 2 is rotatably mounted on the outer wall of braking mechanism 1; Among them, the anti-fouling mechanism 2 includes a scraper 211 fixedly connected to the top of the outer wall of the rotating shaft 111; Passive mechanism 3 is slidably disposed on the side wall of the cleaning shell 20; The passive mechanism 3 includes a trigger ring 311 that is slidably connected to the side wall of the pigging shell 20, and a thrust block 312 that is slidably connected to the inner wall of the trigger ring 311.

[0023] Braking mechanism 1 includes: Rotating assembly 11 is rotatably disposed on the inner wall of the cleaning shell 20; Cleaning component 12 is slidably disposed on the inner wall of cleaning housing 20; After confirming that the pressure in the housing 13 is zero, the staff opens the bypass valve 14 and closes the main ball valve 15 and the main ball valve 2 16. At this time, the drain valve 17 and the purification valve 18 are opened, and then the quick-opening blind flange 19 is opened. The pig housing 20 is placed inside the housing 13, and the quick-opening blind flange 19 is closed and locked. After everything is ready, the pig indicator and pipeline pressure changes are monitored in real time. The pressure difference generated by the medium transported in the pipeline pushes the pig housing 20 to start moving. During the movement of the pig housing 20, the rotating component 11 is subjected to liquid thrust and rotates. When the rotating component 11 rotates, it applies thrust to the cleaning component 12, forcing the cleaning component 12 to move.

[0024] Anti-fouling mechanism 2 includes: Scraping component 21 is rotatably disposed on the outer wall of rotating component 11; Delay component 22 is slidably disposed on the inner wall of cleaning component 12; When the rotating component 11 rotates, it drives the scraping component 21 to rotate synchronously, and during the movement of the cleaning component 12, it drives the delay component 22 to move synchronously.

[0025] Passive mechanism 3 includes: Force-bearing component 31 is slidably disposed on the side wall of the pig shell 20; Support component 32 is slidably disposed on the inner wall of the pig shell 20; During the process, after the pig shell 20 moves for a certain period of time, the force-bearing component 31 is pushed by the impurities and moves. After the force-bearing component 31 moves, it applies a pushing force to the support component 32, forcing the support component 32 to move.

[0026] Example 2, please refer to Figures 4-10 The present invention is a compact pigging tool. Based on the first embodiment, the rotating assembly 11 includes a rotating block 113 fixedly connected to the side wall of the rotating shaft 111. During the movement of the cleaning shell 20, the surface of the impeller 112 continuously comes into contact with the liquid and is simultaneously subjected to the thrust of the liquid, which forces the impeller 112 to rotate. When the impeller 112 rotates, it drives the rotating shaft 111 to rotate synchronously, and the rotating block 113 follows the rotating shaft 111 to rotate.

[0027] The cleaning assembly 12 includes a cleaning plate 121 that is slidably connected to the inner wall of the cleaning tube housing 20, and a spring 122 is fixedly connected to the bottom of the outer wall of the cleaning plate 121. When the rotating block 113 rotates, its inclined surface contacts the bottom of the cleaning plate 121. As the rotating block 113 continues to rotate, it exerts a pushing force on the cleaning plates 121 on both sides, forcing the cleaning plates 121 to move under the force. When the cleaning plates 121 move, they exert a pulling force on the spring 122, causing the spring 122 to be stretched and accumulate potential energy. After moving, the cleaning plates 121 come into contact with the inner wall of the pipe, scraping away impurities from the inner wall of the pipe. When the rotating block 113 rotates to a certain angle, it loses the pushing force on the cleaning plates 121 on both sides, allowing the cleaning plates 121 to return to their original position under the pulling force of the spring 122. After returning to their original position, the cleaning plates 121 do not come into contact with the pipe wall. With the continuous rotation of several rotating blocks 113, several cleaning plates 121 take turns contacting the pipe wall.

[0028] The scraping assembly 21 includes a filter screen 212 fixedly connected to the outer wall of the cleaning housing 20; During the movement of the cleaning shell 20, the filter screen 212 moves along with it. As the filter screen 212 moves, impurities inside the pipe continuously come into contact with the surface of the filter screen 212. At this time, when the rotating shaft 111 rotates, it drives the scraper 211 to rotate synchronously, so that the scraper 211 continuously comes into contact with the surface of the filter screen 212 during the rotation process, generating a thrust on the impurities on the surface of the filter screen 212 to prevent the accumulation of impurities. This causes the impeller 112 to gradually lose liquid thrust and become unable to rotate.

[0029] The delay component 22 includes an arc-shaped block 221 that is slidably connected to the inner wall of the cleaning plate 121, and a spring 222 is fixedly connected to the side wall of the arc-shaped block 221. When the cleaning plate 121 loses the pushing force of the rotating block 113, the cleaning plate 121 begins to reset under the elastic force of the spring 122, and during the reset process, the cleaning plate 121 drives the arc-shaped block 221 to move synchronously, such as... Figure 7 As shown, when the arc-shaped block 221 moves downward, it comes into contact with the protruding block of the cleaning shell 20. Since the side end of the protruding block of the cleaning shell 20 is inclined, the arc-shaped block 221 is pushed by the protruding block of the cleaning shell 20 when it moves downward, forcing the arc-shaped block 221 to move relative to the cleaning plate 121. At the same time as the arc-shaped block 221 moves, it applies a pushing force to the spring 222, causing the spring 222 to be compressed and accumulate potential energy. When the arc-shaped block 221 slowly extends out of the surface of the cleaning plate 121, the impurities on the surface of the cleaning plate 121 come into contact with the arc-shaped surface of the arc-shaped block 221. Due to the arc-shaped surface of the arc-shaped block 221, when the impurities come into contact with it, the speed at which the impurities pass through the gap between the cleaning plate 121 and the pipe wall is slowed down.

[0030] The force-bearing component 31 includes a spring piece 313 fixedly connected to the side wall of the trigger ring 311; Among them, such as Figure 9As shown, when the impurities at point F accumulate to a certain number, the impurities exert a pushing force on the trigger ring 311, causing the trigger ring 311 to move under the force. The pushing block 312 moves along with it, and when the trigger ring 311 moves, it applies pressure to the spring piece 313, causing the spring piece 313 to be compressed and accumulate potential energy.

[0031] The support assembly 32 includes a push rod 321 that is slidably connected to the inner wall of the pig housing 20, and a spring piece 322 is fixedly connected to the outer wall of the push rod 321; When the thrust block 312 moves, it comes into contact with the surface of the push rod 321. Under the action of the spring inside the trigger ring 311, the thrust block 312 moves relative to the trigger ring 311. When the thrust block 312 moves, it comes into contact with the inclined surface of the push rod 321 and generates a thrust on the push rod 321, forcing the push rod 321 to move under force and apply a thrust to the spring piece 322, causing the spring piece 322 to be compressed. When the push rod 321 moves, it comes into contact with the inclined surface of the cleaning plate 121 at the foremost end. As the push rod 321 continues to move, it generates a thrust on the cleaning plate 121, causing the cleaning plate 121 to move under force. After moving, the cleaning plate 121 comes into contact with the pipe wall. At this time, the cleaning plate 121 is no longer affected by the thrust of the rotating block 113.

[0032] One specific application of this embodiment is as follows: After the operator confirms that the pressure of the housing 13 is zero, the bypass valve 14 is opened, and the main ball valve 15 and the main ball valve 2 16 are closed at the same time. At this time, the drain valve 17 and the purification valve 18 are opened, and then the quick-opening blind flange 19 is opened. The pig shell 20 is placed inside the housing 13, and the quick-opening blind flange 19 is closed and locked. After everything is ready, the changes in the pig indicator and pipeline pressure are monitored in real time. The pressure difference generated by the medium transported in the pipeline drives the pig shell 20 to start moving.

[0033] When a large amount of silt, impurities, sewage, or viscous media accumulates inside a pipeline over a long period, the continuous buildup of contaminants at the front end of the cleaning shell 20 increases resistance, causing its movement to gradually slow down. If the amount of contaminants far exceeds the pushing capacity of the cleaning shell 20, it will eventually become completely unable to move, forming a blockage. Once the cleaning shell 20 is blocked, the upstream pressure will continue to rise. If pressure reduction measures are not taken in time, it may cause overpressure, which in severe cases can lead to pipeline rupture and equipment damage. During the movement of the cleaning shell 20, the impeller 112 surface continuously contacts the liquid and is simultaneously pushed by the liquid, forcing the impeller 112 to rotate. As the impeller 112 rotates, it drives the rotating shaft 111 to rotate synchronously. The rotating block 113 follows the rotating shaft 111. When the rotating block 113 rotates, its inclined surface contacts the bottom of the cleaning plate 121. With the continuous rotation of the rotating block 113, the cleaning plate 121 is cleaned from both the top and bottom surfaces. The cleaning plate 121 on the side generates a pushing force, forcing the cleaning plate 121 to move under force. When the cleaning plate 121 moves, it generates a pulling force on the spring 122, causing the spring 122 to be stretched and accumulate potential energy. After moving, the cleaning plate 121 comes into contact with the inner wall of the pipe, and scrapes the impurities on the inner wall of the pipe through the cleaning plate 121. When the rotating block 113 rotates to a certain angle, it loses the pushing force on the cleaning plates 121 on both sides, so that the cleaning plate 121 completes the reset under the pulling force of the spring 122. After the reset, the cleaning plate 121 does not contact the pipe wall. With the continuous rotation of several rotating blocks 113, several cleaning plates 121 take turns contacting the pipe wall. Through the above components, the force on the contact surface between the cleaning shell 20 and the pipe wall is distributed at different positions, and its contact pressure is lower and the friction is also smaller. Under the same pushing pressure difference, it is easier to maintain power, allowing the cleaning shell 20 to maintain movement for a longer time.

[0034] The number of the above components is not limited. Those skilled in the art can set it freely according to actual needs, as long as the above components are installed at the corresponding component connection positions.

[0035] Utilizing the moving characteristics of the cleaning shell 20, the filter screen 212 moves along with the cleaning shell 20. During the movement of the filter screen 212, impurities inside the pipe continuously come into contact with the surface of the filter screen 212. At this time, when the rotating shaft 111 rotates, it drives the scraper 211 to rotate synchronously, so that the scraper 211 continuously contacts the surface of the filter screen 212 during the rotation, generating a thrust on the impurities on the surface of the filter screen 212, preventing the accumulation of impurities and causing the impeller 112 to gradually lose liquid thrust and become unable to rotate. Since the impeller 112 will come into contact with impurities when rotating, and the solid impurity particles will continuously wash and rub against the surface of the impeller 112, long-term action will lead to blade deformation, wall thinning, or even cracking, affecting the working efficiency of the impeller 112. By scraping away impurities through the above-mentioned components, the impurities are prevented from disrupting the dynamic balance of the impeller 112 and the stability of the impeller 112 is improved.

[0036] Utilizing the aforementioned characteristic of the moving cleaning plate 121, when the cleaning plate 121 loses the pushing force of the rotating block 113, the cleaning plate 121 begins to reset under the elastic force of the spring 122, and during the reset process, the cleaning plate 121 drives the arc-shaped block 221 to move synchronously, such as... Figure 7 As shown, when the arc-shaped block 221 moves downward, it comes into contact with the protruding block of the cleaning shell 20. Since the side end of the protruding block of the cleaning shell 20 is inclined, the arc-shaped block 221 is pushed by the protruding block of the cleaning shell 20 when it moves downward, forcing the arc-shaped block 221 to move relative to the cleaning plate 121. At the same time, the arc-shaped block 221 applies a pushing force to the spring 222, causing the spring 222 to be compressed and accumulate potential energy. When the arc-shaped block 221 slowly extends out of the surface of the cleaning plate 121, the impurities on the surface of the cleaning plate 121 come into contact with the arc-shaped surface of the arc-shaped block 221. Due to the arc-shaped surface of the arc-shaped block 221, the impurities are removed from the surface of the cleaning plate 121. When the impurities come into contact with the cleaning plate 121, the speed at which they pass through the gap between the cleaning plate 121 and the pipe wall is slowed down. During the movement of the cleaning plate 121, the open gap allows the impurities on the surface of the cleaning plate 121 to enter the cleaning shell 20. The entering impurities will squeeze and fill the moving space between the cleaning shell 20, causing the cleaning plate 121 to be resisted by the impurities when it switches freely. This prevents the cleaning plate 121 from completing the seal in time, resulting in a decrease in the cleaning effect. Through the above-mentioned components, when the cleaning plate 121 moves, it generates a counter-pushing force on the impurities on the surface of the cleaning plate 121, effectively reducing the speed at which the impurities pass through the gap, thereby reducing the amount of impurities entering.

[0037] Utilizing the aforementioned characteristics of the moving pig shell 20, such as Figure 9As shown, when impurities accumulate to a certain amount at point F, they exert a pushing force on the trigger ring 311, causing it to move. The push block 312 follows suit, and as the trigger ring 311 moves, it applies pressure to the spring 313, compressing it and accumulating potential energy. When the push block 312 moves, it contacts the surface of the push rod 321. Under the action of the spring inside the trigger ring 311, the push block 312 moves relative to the trigger ring 311. As it moves, it contacts the inclined surface of the push rod 321, exerting a pushing force on it, forcing the push rod 321 to move and applying a pushing force to the spring 322, compressing it and causing the push rod 321 to move. 1. During movement, it contacts the inclined surface of the cleaning plate 121 at the foremost position. As the push rod 321 continues to move, it generates a thrust on the cleaning plate 121, causing the cleaning plate 121 to move under force. After moving, the cleaning plate 121 contacts the pipe wall. At this time, the cleaning plate 121 is no longer affected by the thrust of the rotating block 113. As impurities accumulate, when excessive impurities accumulate between the cleaning shells 20, they will directly hinder the normal operation of the cleaning plate 121, causing the switching efficiency between several cleaning plates 121 to completely fail, thereby losing the seal between the cleaning shell 20 and the pipe wall. Through the above components, the cleaning plate 121 is forced to contact the pipe wall, directly cutting off the path of impurities flowing into the cleaning shells 20, and maintaining the movement ability of the cleaning shell 20.

[0038] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A compact pigging device, comprising a housing (13), wherein a bypass valve (14) is fixedly disposed on the side wall of the housing (13), a main ball valve (15) is fixedly disposed on the top of the side wall of the housing (13), a main ball valve (26) is fixedly disposed on the bottom of the side wall of the housing (13), a drain valve (17) is fixedly disposed on the bottom of the side wall of the housing (13), a purification valve (18) is fixedly disposed on the side wall of the housing (13), a quick-opening blind flange (19) is rotatably disposed on the side wall of the housing (13), and a pigging shell (20) is slidably disposed on the inner wall of the housing (13), characterized in that, Also includes: Braking mechanism (1), which is rotatably disposed on the inner wall of the cleaning shell (20); The braking mechanism (1) includes a rotating shaft (111) rotatably connected to the inner wall of the cleaning shell (20), and an impeller (112) is fixedly connected to the side wall of the rotating shaft (111). Anti-fouling mechanism (2), which is rotatably mounted on the outer wall of braking mechanism (1); The anti-fouling mechanism (2) includes a scraper (211) fixedly connected to the top of the outer wall of the rotating shaft (111). Passive mechanism (3), which is slidably disposed on the side wall of the cleaning shell (20); The passive mechanism (3) includes a trigger ring (311) that is slidably connected to the side wall of the cleaning shell (20), and a thrust block (312) is slidably connected to the inner wall of the trigger ring (311).

2. The compact pigging device according to claim 1, characterized in that: The braking mechanism (1) includes: Rotating assembly (11), which is rotatably disposed on the inner wall of the cleaning shell (20); Cleaning component (12), which is slidably disposed on the inner wall of cleaning housing (20); During the movement of the pigging shell (20), the rotating component (11) rotates.

3. A compact pigging device according to claim 2, characterized in that: The antifouling mechanism (2) includes: Scraping assembly (21), which is rotatably disposed on the outer wall of rotating assembly (11); Delay component (22), which is slidably disposed on the inner wall of cleaning component (12); When the rotating component (11) rotates, it drives the scraping component (21) to rotate synchronously.

4. A compact pigging device according to claim 3, characterized in that: The passive mechanism (3) includes: Force-bearing component (31), which is slidably disposed on the side wall of the cleaning shell (20); Support assembly (32), which is slidably disposed on the inner wall of the cleaning shell (20); Among them, after the cleaning shell (20) moves for a certain period of time, the force-bearing component (31) moves under the force.

5. A compact pigging device according to claim 4, characterized in that: The rotating assembly (11) includes a rotating block (113) fixedly connected to the side wall of the rotating shaft (111). The impeller (112) is not on the same plane as the rotating block (113).

6. A compact pigging device according to claim 5, characterized in that: The cleaning assembly (12) includes a cleaning plate (121) slidably connected to the inner wall of the cleaning tube housing (20), and a spring (122) is fixedly connected to the bottom of the outer wall of the cleaning plate (121). The outer ends of the spring (122) are fixedly connected to the upper and lower cleaning plates (121) respectively.

7. A compact pigging device according to claim 5, characterized in that: The scraping assembly (21) includes a filter screen (212) fixedly connected to the outer wall of the cleaning housing (20); The filter screen (212) is a stainless steel wedge wire mesh, which has the characteristics of high strength, smooth surface and wear resistance, and the scraper (211) is not easy to scratch when in contact.

8. A compact pigging device according to claim 6, characterized in that: The delay component (22) includes an arc-shaped block (221) slidably connected to the inner wall of the cleaning plate (121), and a spring (222) is fixedly connected to the side wall of the arc-shaped block (221). In the initial state, the arc-shaped block (221) is in contact with the protruding block of the cleaning shell (20), and the end of the spring (222) away from the arc-shaped block (221) is in contact with the cleaning plate (121).

9. A compact pigging device according to claim 6, characterized in that: The force-bearing component (31) includes a spring piece (313) fixedly connected to the side wall of the trigger ring (311). A spring is provided between the trigger ring (311) and the thrust block (312), and the end of the spring piece (313) away from the trigger ring (311) is fixedly connected to the outer wall of the cleaning shell (20).

10. A compact pigging device according to claim 7, characterized in that: The support assembly (32) includes a push rod (321) that is slidably connected to the inner wall of the pig shell (20), and a spring piece (322) is fixedly connected to the outer wall of the push rod (321). The end of the spring piece (322) away from the push rod (321) is fixedly connected to the inner wall of the cleaning shell (20).

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