Urban gas pipeline perforation under-pressure quick leaking stoppage and repair device

Abstract

The utility model relates to an urban gas pipeline perforation under-pressure quick leaking stoppage and repair device which comprises a first machine body, a second machine body, an ejector rod, a leakage-proof pressing block and a buckling and fixing mechanism, the first machine body and the second machine body are each of an arc-shaped structure or an arch-shaped structure, and one end of the first machine body is hinged to one end of the second machine body; the other end of the first machine body is fixedly connected with the other end of the second machine body through a buckling fixing mechanism, one end of the ejector rod penetrates through the first machine body from the arc-shaped back face or the arch-shaped back face of the first machine body and then is rotationally connected with the leakage-proof pressing block, and a first anti-theft locking mechanism is fixedly arranged on the first machine body and used for limiting rotation of the ejector rod. The buckling and fixing mechanism is further provided with a second anti-theft locking mechanism for limiting the other end of the first machine body and the other end of the second machine body to release the fixed connection relation. The device can be recycled, the repairing cost of the gas pipe is reduced, and the repairing efficiency of the gas pipe is improved; the gas leakage emergency rescue speed is increased, and safe operation of a gas pipeline is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of oil and gas pipeline installation and maintenance technology, specifically to a rapid leak sealing and repair device for perforated and pressurized urban gas pipelines. Background Technology

[0002] With rapid urban development, the number of newly installed buried gas pipelines is increasing significantly every year. However, as these pipelines age, many are aging, leading to corrosion, perforation, or ruptures caused by third-party excavation. Due to the flammable and explosive nature of natural gas, repairing pipelines in the shortest possible time and in the safest manner, while minimizing disruption to residential gas use, remains a major challenge for the gas industry. Gas pipeline leaks are discovered at diverse times and locations. Sometimes, leaks are found during peak residential gas usage periods, sometimes during commercial or industrial production that requires immediate gas supply, and sometimes in densely populated residential areas. Ensuring uninterrupted gas supply while performing pressurized leak repairs under these special circumstances has always been a key challenge in urban gas emergency response. Utility Model Content

[0003] To address the technical problems in existing technologies, such as the inability to promptly repair leaks in gas pipelines when they are corroded and perforated or ruptured due to third-party excavation, this utility model provides a rapid pressurized leak sealing and repair device for perforated urban gas pipelines.

[0004] The technical solution of this utility model to solve the above-mentioned technical problems is as follows:

[0005] A rapid leak sealing and repair device for punctures in urban gas pipelines under pressure includes a first body, a second body, a top rod, a leak-proof pressure block, and a fastening and fixing mechanism. Both the first body and the second body are arc-shaped or bow-shaped structures. One end of the first body is hinged to one end of the second body, and the other end of the first body is fixedly connected to the other end of the second body through the fastening and fixing mechanism.

[0006] One end of the top rod passes through the arc-shaped or bow-shaped back of the first body and is threaded to the first body. The anti-leakage pressure block is located on the inner arc of the first body, and one end of the top rod is rotatably connected to the anti-leakage pressure block. A first anti-theft locking mechanism is fixedly provided on the first body to restrict the rotation of the top rod. A second anti-theft locking mechanism is also provided on the fastening and fixing mechanism to restrict the other end of the first body from being disconnected from the other end of the second body.

[0007] The beneficial effects of this utility model are as follows: When a gas pipe leaks due to a leak hole, the first and second units are fastened to the outside of the gas pipe using a fastening and fixing mechanism. A sealing soft block then seals the leak hole. By rotating the top rod, the anti-leakage pressure block presses down on the sealing soft block. Because the sealing soft block uses a special sealing material, it quickly seals the leak hole under the pressure of the anti-leakage pressure block. Simultaneously, by setting a first and a second anti-theft locking mechanism, after sealing the leak hole, the first anti-theft locking mechanism restricts the rotation of the top rod, and the second anti-theft locking mechanism keeps the first and second units fastened and fixed, thus preventing the first and second units from being easily removed and preventing the anti-leakage pressure block from being easily released to press down on the sealing soft block. When it is necessary to release the anti-theft locks of the first and second anti-theft locking mechanisms, a special key or tool is required. This invention enables recycling and reuse, reduces gas pipe repair costs, increases gas pipe repair efficiency, improves the speed of gas leak emergency response, and ensures the safe operation of gas pipelines.

[0008] Based on the above technical solution, the present invention can be further improved as follows.

[0009] Furthermore, a first locking nut is fixedly provided on the first body, and the push rod is a screw rod; the push rod is threadedly connected to the first body through the first locking nut.

[0010] The beneficial effect of adopting the above-mentioned further solution is that, by setting a locking nut, when the first body is a thin-walled part, it is possible to ensure that the length of the threaded hole is sufficient to match the thread of the push rod, thereby improving the stability of the threaded connection.

[0011] Furthermore, the first anti-theft locking mechanism includes a first locking rod and a first triangular lock head; a first locking groove is provided on the top rod, the first locking groove is provided along the length direction of the top rod, a first lock head receiving hole is provided on the side of the first locking nut, a first locking rod through hole is provided at the bottom of the first lock head receiving hole, the first locking rod through hole is connected to the threaded hole of the first locking nut, the first locking rod through hole is a threaded hole, the first locking rod is a screw, one end of the first locking rod is threadedly matched with the first locking rod through hole, and the other end of the first locking rod is fixedly connected to the first triangular lock head.

[0012] The beneficial effect of adopting the above-mentioned further solution is that after the repair device is installed, an inner triangular wrench is matched with the first triangular lock head so that the first locking rod is rotated by turning the inner triangular wrench so that one end of the first locking rod is inserted into the first locking groove, thereby restricting the rotation of the top rod. When it is necessary to release the restriction on the top rod, a specific triangular wrench is required to rotate the first locking rod to release the restriction.

[0013] Furthermore, the first locking groove is provided with multiple grooves, which are evenly distributed along the outer circle of the top rod.

[0014] The beneficial effect of adopting the above-mentioned further solution is that by setting multiple first locking grooves, it is convenient for the first locking rod to be inserted into the first locking groove when the top rod rotates at different angles.

[0015] Furthermore, a connecting block is fixedly provided on the anti-leakage pressure block, one end of the top rod is rotatably connected to the connecting block, and an anti-detachment block for preventing the top rod from falling off the connecting block is fixedly connected to one end of the top rod.

[0016] The beneficial effect of adopting the above-mentioned further solution is that by setting a connecting block, the rotational connection between the top rod and the anti-leakage pressure block can be realized through the connecting block, so as to ensure that the rotational connection between the top rod and the anti-leakage pressure block can be realized normally even when the anti-leakage pressure block is a thin-walled part.

[0017] Furthermore, the anti-leakage pressure block has an arc structure, and the connecting block is fixedly disposed on the back of the arc of the anti-leakage pressure block.

[0018] The beneficial effect of adopting the above-mentioned further solution is that by setting the anti-leakage pressure block as an arc structure, the arc size of the structure can be set according to the radius of the outer circle of the gas pipe, thereby improving the sealing effect of the sealing soft block.

[0019] Furthermore, the fastening and fixing mechanism includes a first locking plate, a second locking plate, a fixing screw, and a second locking nut;

[0020] One end of the first locking plate is fixedly connected to the other end of the first body, and the other end of the first locking plate has a first through groove; one end of the second locking plate is fixedly connected to the other end of the second body, and the other end of the second locking plate has a second through groove; one end of the fixing screw is located in the second through groove, one end of the fixing screw is hinged to the second locking plate, the second locking nut is threadedly matched with the other end of the fixing screw, and the second anti-theft locking mechanism is disposed on the second locking nut.

[0021] The beneficial effect of adopting the above-mentioned further solution is that after the first locking plate contacts the second locking plate, the other end of the fixing screw is rotated to allow the fixing screw to also be placed into the first through groove, and then the second locking nut is turned to increase the friction between the first locking plate and the second locking plate under pressure, so as to fix the first locking plate and the second locking plate to each other.

[0022] Furthermore, the second anti-theft locking mechanism includes a second locking rod and a second triangular lock head. A second locking groove is provided on the fixing screw, which is opened along the length direction of the second locking nut. A second lock head receiving hole is provided on the side of the second locking nut, and a second locking rod through hole is provided at the bottom of the second locking head receiving hole. The second locking rod through hole is connected to the threaded hole of the second locking nut. The second locking rod through hole is a threaded hole, and the second locking rod is a screw. One end of the second locking rod is threadedly matched with the second locking rod through hole, and the other end of the second locking rod is fixedly connected to the second triangular lock head.

[0023] The beneficial effect of adopting the above-mentioned further solution is that by matching the inner triangular wrench with the second triangular lock head, the second locking rod can be rotated by turning the inner triangular wrench so that one end of the second locking rod can be inserted into the second locking groove, thereby restricting the rotation of the fixing screw. When it is necessary to release the restriction on the fixing screw, a specific triangular wrench is required to rotate the second locking rod to release the restriction.

[0024] Furthermore, the top rod is also provided with a crossbar, and the other end of the top rod is provided with a crossbar through hole. The crossbar through hole is a through hole and is perpendicular to the center line of the top rod. The crossbar and the crossbar through hole are interlocked and matched.

[0025] The beneficial effect of adopting the above-mentioned further solution is that by setting a crossbar, it is easier to rotate the push rod using the crossbar, thereby improving the rotation efficiency of the push rod.

[0026] Furthermore, each end of the crossbar is provided with a limiting block, and the limiting block is threadedly connected to the crossbar.

[0027] The advantage of adopting the above-mentioned further solution is that by setting a limit block, it is possible to prevent the crossbar from falling off the top rod. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of the present invention. Figure 1 ;

[0029] Figure 2 This is a schematic diagram of the structure of the present invention. Figure 2 ;

[0030] Figure 3 This is a cross-sectional view of the first anti-theft locking mechanism;

[0031] Figure 4 This is a schematic diagram of the cross-sectional structure of the push rod;

[0032] Figure 5 A schematic diagram of the connection structure between the anti-leakage pressure block and the top rod;

[0033] Figure 6Exploded view of the connection between the pressure block and the top rod to prevent leakage;

[0034] Figure 7 This is a partial side view of the push rod;

[0035] Figure 8 A sectional view showing the connection between the horizontal bar and the limiting block;

[0036] Figure 9 This is a top view of the first locking plate;

[0037] Figure 10 This is a top view of the second locking plate;

[0038] Figure 11 This is a cross-sectional view of the second anti-theft locking mechanism;

[0039] Figure 12 This is a schematic diagram illustrating the installation and application of this utility model.

[0040] The attached diagram lists the components represented by each number as follows:

[0041] 1. First body; 2. Second body; 3. Leak-proof pressure block; 4. Top rod; 5. First locking nut; 6. First anti-theft locking mechanism; 7. Crossbar; 8. Limiting block; 9. Fastening and fixing mechanism; 10. First locking plate; 11. Second locking plate; 12. Second anti-theft locking mechanism; 13. Fixing screw; 14. Second through groove; 15. First through groove; 16. Second locking nut; 17. First locking rod through hole; 18. First locking rod ; 19. First lock head receiving hole; 20. First triangular lock head; 21. First locking groove; 22. Connecting block; 23. Top rod through hole; 24. Anti-detachment block receiving hole; 25. Anti-detachment block; 26. Crossbar through hole; 27. Second locking groove; 28. Second locking rod through hole; 29. ​​Second lock head receiving hole; 30. Second locking rod; 31. Second triangular lock head; 32. Gas pipe; 33. Leakage hole; 34. Sealing soft block; 35. Anti-detachment boss. Detailed Implementation

[0042] The principles and features of this utility model are described below with reference to the accompanying drawings. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.

[0043] like Figure 1 and Figure 2 As shown, this embodiment provides a rapid leak sealing and repair device for perforated urban gas pipelines under pressure, including a first body 1, a second body 2, a top rod 4, a leak-proof pressure block 3, and a fastening and fixing mechanism 9. Both the first body 1 and the second body 2 are arc-shaped or bow-shaped structures. One end of the first body 1 is hinged to one end of the second body 2, and the other end of the first body 1 is fixedly connected to the other end of the second body 2 through the fastening and fixing mechanism 9.

[0044] One end of the top rod 4 passes through the arc-shaped or bow-shaped back of the first body 1. The top rod 4 is threadedly connected to the first body 1. The anti-leakage pressure block 3 is located on the inner side of the arc of the first body 1. One end of the top rod 4 is rotatably connected to the anti-leakage pressure block 3. A first anti-theft locking mechanism 6 is fixedly provided on the first body 1. The first anti-theft locking mechanism 6 is used to restrict the rotation of the top rod 4. A second anti-theft locking mechanism 12 is also provided on the fastening and fixing mechanism 9. The second anti-theft locking mechanism 12 is used to restrict the other end of the first body 1 from being disconnected from the other end of the second body 2.

[0045] In some embodiments, a first locking nut 5 is also fixedly provided on the first body 1, and the push rod 4 is a screw rod; the push rod 4 and the first body 1 are threadedly connected by the first locking nut 5. The first locking nut 5 is welded to the top end, outer arc side, or bow-shaped back of the first body 1. Both the first body 1 and the second body 2 are thin-walled structural components to reduce the weight of the entire leak repair device. By providing the locking nut 5, when the first body 1 is a thin-walled component, sufficient threaded hole length can be ensured to match the thread of the push rod 4, improving the stability of the threaded connection.

[0046] In some embodiments, the anti-leakage pressure block 3 has an arc structure, and the connecting block 22 is fixedly disposed on the arc-shaped back side of the anti-leakage pressure block 3. By setting the anti-leakage pressure block 3 to an arc structure, a structure with an arc size that matches the outer radius of the gas pipe 32 can be set, thereby improving the sealing effect of the sealing soft block 34.

[0047] like Figure 3 As shown, in some embodiments, the first anti-theft locking mechanism 6 includes a first locking rod 18 and a first triangular lock head 20; a first locking groove 21 is provided on the top rod 4, the first locking groove 21 is provided along the length direction of the top rod 4, a first lock head receiving hole 19 is provided on the side of the first locking nut 5, a first locking rod through hole 17 is provided at the bottom of the first lock head receiving hole 19, the first locking rod through hole 17 is connected to the threaded hole of the first locking nut 5, the first locking rod through hole 17 is a threaded hole, the first locking rod 18 is a screw, one end of the first locking rod 18 is threadedly matched with the first locking rod through hole 17, and the other end of the first locking rod 18 is fixedly connected to the first triangular lock head 20. The diameter of the first locking rod through hole 17 is smaller than the diameter of the first lock head receiving hole 19, the rotation diameter of the first triangular lock head 20 is larger than the diameter of the first locking rod through hole 17, and the rotation diameter of the first triangular lock head 20 is smaller than the diameter of the first lock head receiving hole 19.

[0048] After the repair device is installed, the inner triangular wrench is matched with the first triangular lock head 20 so that the first locking rod 18 is turned by turning the inner triangular wrench so that one end of the first locking rod 18 is inserted into the first locking groove 21, thereby restricting the rotation of the top rod 4. When it is necessary to release the restriction on the top rod 4, a specific triangular wrench is required to turn the first locking rod 18 to release the restriction.

[0049] like Figure 4 As shown, multiple first locking grooves 21 are provided, and these grooves are evenly distributed along the outer circumference of the top rod 4. Preferably, there are three first locking grooves 21. Each first locking groove 21 is a trapezoidal groove, and one end of the first locking rod 18 is fixedly provided with a first frustum-shaped protrusion, which is inserted into and matched with the first locking groove 21. Alternatively, one end of the first locking rod 18 may be configured as a frustum structure that is inserted into and matched with the first locking groove 21.

[0050] By setting multiple first locking grooves 21, the first locking rod 18 can be inserted into the first locking groove 21 when the top rod 4 rotates at different angles.

[0051] like Figure 5 As shown, a connecting block 22 is fixedly provided on the anti-leakage pressure block 3, one end of the top rod 4 is rotatably connected to the connecting block 22, and an anti-detachment block 25 is fixedly connected to one end of the top rod 4 to prevent the top rod 4 from falling off the connecting block 22.

[0052] By setting the connecting block 22, the rotational connection between the top rod 4 and the anti-leakage pressure block 3 can be realized, so as to ensure that the rotational connection between the top rod 4 and the anti-leakage pressure block 3 can be realized normally even when the anti-leakage pressure block 3 is a thin-walled part.

[0053] like Figure 6 As shown, a top rod through hole 23 is provided on the top end face of the connecting block 22, and an anti-detachment block receiving hole 24 is provided on the bottom end of the connecting block 22. The top rod through hole 23 is connected to the anti-detachment block receiving hole 24, and the top rod through hole 23 and the anti-detachment block receiving hole 24 form a stepped hole. The diameter of the top rod through hole 23 is smaller than the diameter of the anti-detachment block receiving hole 24. One end of the top rod 4 is inserted through the top rod through hole 23 and then welded to the anti-detachment block 25 in the anti-detachment block receiving hole 24. One end of the top rod 4 is clearance-fitted with the top rod through hole 23.

[0054] like Figure 7 As shown, the push rod 4 is also equipped with a crossbar 7, and the other end of the push rod 4 has a crossbar through hole 26. The crossbar through hole 26 is a through hole and is perpendicular to the center line of the push rod 4. The crossbar 7 is inserted and matched with the crossbar through hole 26. By setting the crossbar 7, it is convenient to rotate the push rod 4 using the crossbar 7, thereby improving the rotation efficiency of the push rod 4.

[0055] like Figure 8As shown, each end of the crossbar 7 is provided with a limiting block 8, which is threadedly connected to the crossbar 7. The limiting block 8 is preferably spherical, with threaded holes. External threads are provided at both ends of the crossbar 7, and these external threads respectively match the threaded holes on the two limiting blocks 8. By providing the limiting blocks 8, the crossbar 7 can be prevented from detaching from the push rod 4.

[0056] The fastening and fixing mechanism 9 includes a first locking plate 10, a second locking plate 11, a fixing screw 13, and a second locking nut 16; one end of the first locking plate 10 is fixedly connected to the other end of the first body 1. One end of the second locking plate 11 is fixedly connected to the other end of the second body 2.

[0057] like Figure 9 As shown, a first through groove 15 is provided at the other end of the first locking plate 10. An anti-detachment protrusion 35 is fixedly provided on the top surface of the other end of the first locking plate 10, that is, after the first body 1 and the second body 2 are fastened together, the anti-detachment protrusion 35 is located on the side away from the second locking plate 11.

[0058] like Figure 10 As shown, the other end of the second locking plate 11 is provided with a second through groove 14. One end of the fixing screw 13 is located in the second through groove 14, and one end of the fixing screw 13 is hinged to the second locking plate 11. The second locking nut 16 is threadedly matched with the other end of the fixing screw 13, and the second anti-theft locking mechanism 12 is provided on the second locking nut 16.

[0059] After the first locking plate 10 contacts the second locking plate 11, rotate the other end of the fixing screw 13 to let the fixing screw 13 also enter the first through groove 15, and then tighten the second locking nut 16. The second locking nut 16 increases the friction between the first locking plate 10 and the second locking plate 11 under pressure, so as to fix the first locking plate 10 and the second locking plate 11 to each other.

[0060] like Figure 11The second anti-theft locking mechanism 12 includes a second locking rod 30 and a second triangular lock head 31. A second locking groove 27 is provided on the fixing screw 13, extending along the length of the second locking nut 16. A second lock head receiving hole 29 is provided on the side of the second locking nut 16, and a second locking rod through hole 28 is provided at the bottom of the second locking head receiving hole 29, communicating with the threaded hole of the second locking nut 16. The second locking rod through hole 28 is a threaded hole, and the second locking rod 30 is a screw. One end of the second locking rod 30 is threaded into the second locking rod through hole 28, and the other end is fixedly connected to the second triangular lock head 31. The second locking groove 27 is a trapezoidal groove, and a second frustum-shaped protrusion is fixedly provided at one end of the second locking rod 30, which is inserted into and matched with the second locking groove 27. Alternatively, one end of the second locking rod 30 may be a frustum structure that is inserted into and matched with the second locking groove 27.

[0061] An inner triangular wrench is matched with a second triangular lock head 31 so that the second locking rod 30 is rotated by turning the inner triangular wrench so that one end of the second locking rod 30 is inserted into the second locking groove 27, thereby restricting the rotation of the fixing screw 13. When it is necessary to release the restriction on the fixing screw 13, a specific triangular wrench is required to rotate the second locking rod 13 to release the restriction.

[0062] like Figure 12 As shown, when the gas pipe 32 leaks due to the leak hole 33, the first body 1 and the second body 2 are fastened to the outside of the gas pipe 32, and the fastening and fixing mechanism 9 is used to fasten and fix the first body 1 and the second body 2. Then, the leak hole 33 is sealed by the sealing soft block 34, and the anti-leakage pressure block 3 is pressed against the sealing soft block 34 by rotating the top rod 4. The sealing soft block 34 can be a special sealing soft material such as a repair rubber gasket. Because the sealing soft block 34 uses a special sealing soft material, the sealing soft block 34 achieves rapid sealing of the leak hole 33 under the pressure of the anti-leakage pressure block 3. Simultaneously, by setting the first anti-theft locking mechanism 6 and the second anti-theft locking mechanism 12, after the leakage hole 33 is sealed, the first anti-theft locking mechanism 6 restricts the rotation of the rotating top rod 4, and the second anti-theft locking mechanism 12 keeps the first body 1 and the second body 2 locked together, thereby preventing the first body 1 and the second body 2 from being easily removed and preventing the anti-leakage pressure block 3 from being easily released to press the sealing soft block 34. When it is necessary to release the anti-theft locking mechanisms 6 and 12, a special key or tool is required. This utility model can be recycled and reused, reducing the cost of gas pipe repair, increasing the efficiency of gas pipe repair, improving the speed of gas leak emergency response, and ensuring the safe operation of gas pipelines.

[0063] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the concept and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A kind of urban gas pipeline perforation pressurized quick leak stoppage repair device, it is characterized by: The utility model provides a kind of top rod locking device, including first body (1), second body (2), top rod (4), leakage prevention block (3) and buckle fixing mechanism (9), the first body (1) and the second body (2) are arc structure or bow structure, one end of the first body (1) is hinged with one end of the second body (2), the other end of the first body (1) is fixedly connected with the other end of the second body (2) by the buckle fixing mechanism (9); One end of the top rod (4) penetrates the first body (1) from the arc back or bow back of the first body (1), the top rod (4) is threadedly connected with the first body (1), the leakage prevention block (3) is located on the arc inner side of the first body (1), and one end of the top rod (4) is rotatably connected with the leakage prevention block (3); a first anti-theft locking mechanism (6) is fixedly arranged on the first body (1), the first anti-theft locking mechanism (6) is used for limiting rotation of the top rod (4), and a second anti-theft locking mechanism (12) is further arranged on the buckle fixing mechanism (9), the second anti-theft locking mechanism (12) is used for limiting the other end of the first body (1) and the other end of the second body (2) to be in a fixed connection relationship.

2. The device for repairing the puncture of the town gas pipeline under pressure according to claim 1, characterized in that: A first locking nut (5) is further fixedly arranged on the first body (1), and the top rod (4) is a screw rod; the top rod (4) is threadedly connected with the first body (1) through the first locking nut (5).

3. The device for repairing the puncture of the town gas pipeline under pressure according to claim 2, characterized in that: The first anti-theft locking mechanism (6) comprises a first locking rod (18) and a first triangular lock head (20); a first locking groove (21) is formed in the top rod (4), the first locking groove (21) is formed along the length direction of the top rod (4), the side surface of the first locking nut (5) is provided with a first lock head accommodating hole (19), the bottom of the first lock head accommodating hole (19) is provided with a first locking rod passing hole (17), the first locking rod passing hole (17) is communicated with the threaded hole of the first locking nut (5), the first locking rod passing hole (17) is a threaded hole, the first locking rod (18) is a screw rod, one end of the first locking rod (18) is threadedly matched with the first locking rod passing hole (17), and the other end of the first locking rod (18) is fixedly connected with the first triangular lock head (20).

4. The device according to claim 3, characterized in that: A plurality of first locking grooves (21) are arranged, and the plurality of first locking grooves (21) are uniformly distributed along the outer circle of the top rod (4).

5. The apparatus according to claim 1, wherein: A connecting block (22) is fixedly arranged on the leakage prevention block (3), one end of the top rod (4) is rotatably connected with the connecting block (22), and one end of the top rod (4) is fixedly connected with an anti-falling block (25) for preventing the top rod (4) from falling off the connecting block (22).

6. The device for repairing a perforation in a town gas pipeline under pressure according to claim 5, characterized in that: The leakage prevention block (3) is a circular arc structure, and the connecting block (22) is fixedly arranged on the circular arc back of the leakage prevention block (3).

7. The apparatus according to claim 1, wherein: The buckle fixing mechanism (9) comprises a first lock buckle pressing plate (10), a second lock buckle pressing plate (11), a fixed screw rod (13) and a second locking nut (16). One end of the first lock plate (10) is fixedly connected with the other end of the first body (1), and the other end of the first lock plate (10) is provided with a first through slot (15); one end of the second lock plate (11) is fixedly connected with the other end of the second body (2), and the other end of the second lock plate (11) is provided with a second through slot (14); one end of the fixed screw rod (13) is located in the second through slot (14), and the other end of the fixed screw rod (13) is hingedly connected with the second lock plate (11); the second lock nut (16) is threadedly matched with the other end of the fixed screw rod (13), and the second anti-theft locking mechanism (12) is arranged on the second lock nut (16).

8. The device according to claim 7, characterized in that: The second anti-theft locking mechanism (12) comprises a second lock rod (30) and a second triangular lock head (31), a second locking groove (27) is formed in the fixed screw rod (13), and the second locking groove (27) is formed along the length direction of the second lock nut (16); a second lock head accommodating hole (29) is formed in the side surface of the second lock nut (16), a second lock rod passing hole (28) is formed in the hole bottom of the second lock head accommodating hole (29), and the second lock rod passing hole (28) is communicated with the threaded hole of the second lock nut (16); the second lock rod passing hole (28) is a threaded hole, the second lock rod (30) is a screw rod, one end of the second lock rod (30) is threadedly matched with the second lock rod passing hole (28), and the other end of the second lock rod (30) is fixedly connected with the second triangular lock head (31).

9. The apparatus according to claim 1, wherein: The top rod (4) is further provided with a cross rod (7), the other end of the top rod (4) is provided with a cross rod passing hole (26), the cross rod passing hole (26) is a through hole, the cross rod passing hole (26) is perpendicular to the center line of the top rod (4), and the cross rod (7) is penetratingly matched with the cross rod passing hole (26).

10. The apparatus according to claim 9, wherein the apparatus further comprises a sealing member. Both ends of the cross rod (7) are provided with limiting blocks (8), and the limiting blocks (8) are threadedly connected with the cross rod (7). Both ends of the cross rod (7) are provided with limiting blocks (8), and the limiting blocks (8) are threadedly connected with the cross rod (7).

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