Leakage detection device for gas pipeline

Abstract

The utility model relates to the technical field of gas transmission pipeline leakage detection, and discloses a gas transmission pipeline leakage detection device, which comprises a lantern ring sleeved on the peripheral side of a gas transmission pipeline; the two sealing assemblies are arranged at intervals in the axis direction of the lantern ring, each sealing assembly comprises a stop ring, an expansion ball and an extrusion ring which are in a circular ring shape and are sequentially arranged from the middle of the lantern ring to the end of the lantern ring, the stop rings and the extrusion rings are fixedly connected and slidably connected to the inner side wall of the lantern ring, and the expansion balls are fixedly clamped between the stop rings and the extrusion rings; and the detection assembly is communicated with the lantern ring between the two expansion balls and is used for detecting the leakage condition of the gas pipeline. On the premise that the pipeline is not disassembled and assembled, the pipeline leakage detection device can move along the axis direction of the pipeline, so that the aim of quickly detecting leakage conditions at different positions of the pipeline is fulfilled.

Description

Technical Field

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

[0002] Existing pipeline gas leak detection relies primarily on regular pipeline inspections. However, this inspection method often makes it difficult to detect and locate even tiny leaks. This undoubtedly increases pipeline system safety risks and poses potential threats to the environment and human health.

[0003] Patent announcement number CN221098356U discloses a gas leakage detection device for a gas transmission pipeline. In this utility model, through the coordination between the upper ring, the lower ring, the sealing ring, the pressure probe, the controller, the alarm, the pressure gauge, etc., it is possible to determine whether there is a gas leak in the gas transmission pipeline, making it convenient for the staff to take the next step.

[0004] However, during use, once the detection device is installed on the gas pipeline, it cannot be moved further. When it is necessary to detect different parts of the same pipeline, it still needs to be disassembled and assembled, and the purpose of rapid detection along the axis of the gas pipeline cannot be achieved.

[0005] In view of this, how to change the current situation in which the detection device in the prior art is difficult to quickly detect small leak points along the axis of the gas pipeline has become a technical problem that technicians in this field urgently need to solve. Utility Model Content

[0006] The utility model aims to provide a gas pipeline leakage detection device to overcome the above-mentioned shortcomings.

[0007] In order to achieve the above-mentioned purpose, the technical solution of the present utility model is:

[0008] A gas pipeline leakage detection device, comprising:

[0009] A collar used to be sleeved around the side of a gas transmission pipeline;

[0010] Two sealing assemblies spaced apart along the axis of the collar, the sealing assemblies comprising a retaining ring, an expansion ball, and an extrusion ring arranged in an annular shape from the middle of the collar toward the end, the retaining ring and the extrusion ring being fixedly connected and slidably connected to the inner side wall of the collar, respectively, with the expansion ball fixedly clamped therebetween; and

[0011] A detection component is connected to the collar between the two expansion balls, and is used to detect leakage in the gas pipeline.

[0012] Furthermore, it also includes a driving assembly for driving the extrusion ring to approach or move away from the corresponding stop ring.

[0013] Furthermore, the driving assembly includes:

[0014] A plurality of sliding grooves arranged at intervals are provided on the outer edge of one side of the extrusion ring away from the middle of the collar;

[0015] a plurality of sliding blocks provided in one-to-one correspondence with the plurality of sliding grooves, the sliding blocks being provided with a first inclined surface slidably connected to the sliding groove along a radial direction of the collar, the first inclined surface being inclined in a direction close to the collar axis toward a direction away from the middle portion of the collar; and

[0016] An elastic member is arranged between the stop ring and the extrusion ring, and is used to drive the extrusion ring to move away from the middle of the ring.

[0017] Furthermore, the driving assembly further includes:

[0018] a plurality of first sliding rods fixedly connected to the plurality of sliding blocks in a one-to-one correspondence, wherein the first sliding rods are located on a side of the sliding block away from the axis of the collar; and

[0019] A stepped through hole is arranged on the inner wall of the ring and corresponds to the sliding block one by one. The large hole of the stepped through hole is located on the side of the small hole of the stepped through hole close to the axis of the ring. The sliding block is slidingly connected to the large hole of the stepped through hole. The first sliding rod is slidingly connected to the stepped through hole. A first compression spring is arranged in the large hole of the stepped through hole. The first compression spring is sleeved on the circumference of the first sliding rod, and the two ends of the first compression spring are respectively connected to the sliding block and the end wall of the large hole of the stepped through hole.

[0020] Furthermore, the driving assembly further includes:

[0021] a protrusion fixedly connected to the side wall of the sliding block away from the middle of the collar; and

[0022] A driving ring is annular and rotatably connected to the inner side wall of the collar, the driving ring is arranged one-to-one on the side of the extrusion ring away from the middle of the collar, and a blind groove is arranged one-to-one corresponding to the protrusion on the side wall of the driving ring close to the middle of the collar, and the blind groove is provided with a second inclined surface slidably connected to the protrusion. The rotation of the driving ring can drive the sliding block to move along the radial direction of the collar toward and away from the axis of the collar.

[0023] Furthermore, the second inclined surfaces on the two driving rings at both ends of the collar have opposite inclination directions, and an operating handle is provided on the side wall of the second inclined surface away from the middle of the collar.

[0024] Furthermore, the elastic member includes:

[0025] A second sliding rod having one end fixedly connected to the stop ring and the other end passing through the extrusion ring; and

[0026] A second compression spring is sleeved on the circumferential side of the second sliding rod, and the two ends of the second compression spring are respectively connected to the stop ring and the extrusion ring used in conjunction with it. Along the axial direction of the ring, the force exerted by the second compression spring on the extrusion ring is smaller than the force exerted by the sliding block on the extrusion ring.

[0027] Furthermore, a slot is provided on the side wall of the retaining ring away from the center of the collar, and a plug plate is provided on the side wall of the extrusion ring close to the center of the collar. The plug plate is slidably connected to the slot, and the slot and the plug plate are located between the second sliding rod and the expansion ball.

[0028] Furthermore, the detection component includes:

[0029] A probe, one end of which passes through the collar and communicates with the collar between the two expansion balls;

[0030] a controller electrically connected to the probe; and

[0031] A screen, an alarm and a power supply are electrically connected to the controller, and the controller, the screen, the alarm and the power supply are all located outside the ring.

[0032] Furthermore, the collar comprises an upper collar and a lower collar that are detachably connected, the upper collar and the lower collar can be enclosed in a circular ring shape, one end of the upper collar is hinged to one end of the lower collar, and the other end of the upper collar is detachably connected to the other end of the lower collar;

[0033] Each of the retaining rings comprises two retaining ring units fixedly connected to the upper and lower sleeves in a one-to-one correspondence, and the two retaining ring units can be assembled into a circular ring shape;

[0034] Each of the extrusion rings comprises two extrusion ring monomers that are slidably connected to the upper and lower sleeve rings in a one-to-one correspondence, and the two extrusion ring monomers can be assembled into a circular ring shape;

[0035] Each of the expansion balls comprises two expansion ball monomers sandwiched between a stop ring monomer and an extrusion ring monomer, and the two expansion ball monomers can be assembled into a circular ring shape;

[0036] Each driving ring includes two driving ring monomers rotatably connected to the upper ring and the lower ring, and the two driving ring monomers can be assembled into a circular ring shape.

[0037] Compared with the prior art, the present invention has at least the following advantages:

[0038] The extrusion ring and the stop ring are close to each other, which can drive the expansion ball to compress and make it stick to the side of the gas pipeline. Under the action of the expansion balls at both ends of the ring, a closed space is formed between the ring and the gas pipeline. At this time, the detection component can be used to detect leakage in the gas pipeline corresponding to the ring.

[0039] When it is necessary to move along the axis of the gas pipeline to change to a new detection position, the extrusion ring and the stop ring are moved away from each other, driving the expansion ball to expand and contract until the gap between the expansion ball and the gas pipeline is matched. At this time, the detection device of the utility model can be moved along the axis of the gas pipeline, and the extrusion ring and the stop ring are moved closer to each other again, so that a closed space is formed between the ring and the gas pipeline at the new position under the action of the expansion balls at both ends, and the detection component can be used again to detect leakage.

[0040] The utility model can be moved along the axial direction of the pipeline without disassembling the pipeline, thereby realizing the purpose of quickly detecting leakage conditions at different positions of the pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0042] Figure 1 This is a schematic diagram of the overall structure of the gas pipeline leakage detection device of the utility model;

[0043] Figure 2 This is a cross-sectional view of a gas pipeline leakage detection device according to the present invention;

[0044] Figure 3 This is another cross-sectional view of the gas pipeline leakage detection device of the present invention;

[0045] Figure 4 This is an exploded view of the gas pipeline leakage detection device of the utility model;

[0046] Figure 5 This is another exploded view of the gas pipeline leakage detection device of the present invention;

[0047] Figure 6 This is a structural block diagram of the detection component of the utility model.

[0048] Figure markings: 1. Ring; 2. Stop ring; 3. Expansion ball; 4. Extrusion ring; 5. Sliding groove; 6. Sliding block; 7. First inclined surface; 8. First sliding rod; 9. Stepped through hole; 10. First compression spring; 11. Bump; 12. Drive ring; 13. Blind groove; 14. Second inclined surface; 15. Operating handle; 16. Second sliding rod; 17. Second compression spring; 18. Slot; 19. Insert board; 20. Probe; 21. Controller; 22. Screen; 23. Alarm; 24. Power supply. DETAILED DESCRIPTION

[0049] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0050] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0051] Reference Figure 1-5The utility model provides a leakage detection device for a gas pipeline, comprising a collar 1, a sealing component and a detection component. Wherein: the ring 1 is used to be sleeved on the circumference of the gas pipeline (not shown in the figure); there are two sets of sealing components, which are spaced apart along the axial direction of the ring 1, and the sealing components include a stop ring 2, an expansion ball 3 and an extrusion ring 4 in a circular shape and arranged in sequence from the center of the ring 1 toward the end. The stop ring 2 and the extrusion ring 4 are respectively fixedly connected and slidably connected to the inner side wall of the ring 1, and the expansion ball 3 is fixedly clamped between the two. The two sides of the expansion ball 3 along the axial direction are respectively fixedly connected to the stop ring 2 and the extrusion ring 4. The expansion ball 3 is made of flexible rubber material and can be compressed and stretched; the extrusion ring 4 and the stop ring 2 are close to each other, which can drive the expansion ball 3 to be compressed and pressed against the circumference of the gas pipeline. At this time, the ring 1 can form a closed space with the gas pipeline under the action of the expansion balls 3 at both ends; on the contrary, the extrusion ring 4 and the stop ring 2 are far away from each other, which can drive the expansion ball 3 to stretch and make it away from the circumference of the gas pipeline. At this time, the gas pipeline and the expansion ball 3 are clearance-fitted. By stretching the expansion balls 3, the present leak detection device can be moved along the axis of the gas pipeline, enabling rapid switching between different positions. After changing positions, the expansion balls 3 are compressed, enabling rapid detection along the axis of the gas pipeline. The detection assembly is connected to the collar 1 between the two expansion balls 3 and is used to detect leaks in the gas pipeline.

[0052] It should be noted that the utility model can only move along the axial direction of the gas pipeline, but cannot be applied to gas pipelines at bends and turns. It is preferably suitable for detecting small leaks in smaller pipes, such as gas pipes with a diameter of 21.9mm-36.2mm, and can achieve rapid movement through manpower.

[0053] Preferably, the present invention further comprises a driving assembly for driving the extrusion ring 4 to move closer to or away from the stop ring 2 corresponding thereto.

[0054] Specifically, the drive assembly includes a sliding groove 5, a sliding block 6, and an elastic member. Several sliding grooves 5 are spaced apart on the outer edge of the extrusion ring 4, away from the center of the collar 1. These sliding grooves 5 are arranged in a circular array along the axis of the collar 1. The sliding blocks 6 correspond to the sliding grooves 5 in a one-to-one relationship. Each sliding block 6 has a first inclined surface 7 that slides in contact with the sliding groove 5 along the radial direction of the collar 1. The first inclined surface 7 is inclined from the axis of the collar 1 toward the direction away from the center of the collar 1. An elastic member is disposed between the retaining ring 2 and the extrusion ring 4, and is used to drive the extrusion ring 4 to move away from the center of the collar 1.

[0055] When the sliding block 6 moves along the radial direction of the collar 1 toward the direction close to the axis of the collar 1, it can overcome the force of the elastic member on the extrusion ring 4, so that the extrusion ring 4 moves toward the middle of the collar 1, and the expansion ball 3 is compressed at this time; conversely, when the sliding block 6 moves along the radial direction of the collar 1 toward the direction away from the axis of the collar 1, the extrusion ring 4 can move toward the direction away from the middle of the collar 1 under the action of the elastic member, and the expansion ball 3 is stretched at this time.

[0056] Preferably, the drive assembly further comprises a first sliding rod 8, a first compression spring 10 and a stepped through hole 9 arranged on the side wall of the collar 1. There are a plurality of first sliding rods 8, and a plurality of first sliding rods 8 and a plurality of sliding blocks 6 are fixedly connected in a one-to-one correspondence. The first sliding rod 8 is located on the side of the sliding block 6 away from the axis of the collar 1; the stepped through hole 9 is arranged on the side wall of the collar 1, and the stepped through hole 9 and the sliding block 6 are arranged in a one-to-one correspondence. The large hole of the stepped through hole 9 is located on the side of the small hole of the stepped through hole 9 close to the axis of the collar 1. The sliding block 6 is slidably connected to the large hole of the stepped through hole 9, the first sliding rod 8 is slidably connected to the stepped through hole 9, and a first compression spring 10 is arranged in the large hole of the stepped through hole 9. The first compression spring 10 is sleeved on the circumference of the first sliding rod 8, and the two ends of the first compression spring 10 are respectively connected to the sliding block 6 and the large hole end wall of the stepped through hole 9.

[0057] Preferably, the driving assembly further comprises a protrusion 11 and a driving ring 12, the protrusion 11 being fixedly connected to the side wall of the sliding block 6 away from the middle of the collar 1; the driving ring 12 is annular and rotatably connected to the inner side wall of the collar 1, the driving ring 12 being arranged one-to-one on the side of the extrusion ring 4 away from the middle of the collar 1, and a blind groove 13 being arranged one-to-one corresponding to the protrusion 11 on the side wall of the driving ring 12 close to the middle of the collar 1, the protrusion 11 being arranged and embedded in the blind groove 13, and the blind groove 13 being provided with a second inclined surface 14 being slidably connected to the protrusion 11, and the rotation of the driving ring 12 can drive the sliding block 6 to move along the radial direction of the collar 1 toward and away from the axial direction of the collar 1.

[0058] Similarly, when the driving ring 12 rotates and drives the sliding block 6 to move along the radial direction of the ring 1 toward the axis of the ring 1, it can overcome the force of the elastic member on the extrusion ring 4 and drive the extrusion ring 4 to move toward the middle of the ring 1. At this time, the expansion ball 3 is compressed; conversely, when the driving ring 12 rotates and drives the sliding block 6 to move along the radial direction of the ring 1 toward the axis of the ring 1 away from the ring 1, the extrusion ring 4 can move in the direction away from the middle of the ring 1 under the action of the elastic member. At this time, the expansion ball 3 is stretched.

[0059] Preferably, the second inclined surfaces 14 on the two driving rings 12 at both ends of the collar 1 have opposite inclination directions, and an operating handle 15 is provided on the side wall of the second inclined surface 14 away from the middle of the collar 1 .

[0060] Specifically, the elastic member includes a second sliding rod 16 and a second compression spring 17. One end of the second sliding rod 16 is fixedly connected to the stop ring 2, and the other end of the second sliding rod 16 passes through the extrusion ring 4 and is slidably connected to the extrusion ring 4. The second compression spring 17 is sleeved around the second sliding rod 16, and the two ends of the second compression spring 17 are respectively connected to the stop ring 2 and the extrusion ring 4 used in conjunction with it. Along the axis of the collar 1, the force exerted by the second compression spring 17 on the extrusion ring 4 is less than the force exerted by the sliding block 6 on the extrusion ring 4.

[0061] Preferably, a slot 18 is provided on the side wall of the stop ring 2 away from the center of the collar 1, and a plug plate 19 is provided on the side wall of the extrusion ring 4 close to the center of the collar 1. The plug plate 19 is slidably connected to the slot 18, and the slot 18 and the plug plate 19 are located between the second sliding rod 16 and the expansion ball 3.

[0062] Preferably, the collar 1 comprises an upper collar and a lower collar that are detachably connected, the upper collar and the lower collar can be enclosed in a circular ring, one end of the upper collar is hinged to one end of the lower collar, and the other end of the upper collar is detachably connected to the other end of the lower collar;

[0063] Each retaining ring 2 includes two retaining ring monomers fixedly connected to the upper sleeve ring and the lower sleeve ring in a one-to-one correspondence, and the two retaining ring monomers can be assembled into a circular ring shape.

[0064] Each extrusion ring 4 includes two extrusion ring monomers that are slidably connected to the upper ring and the lower ring in a one-to-one correspondence. The two extrusion ring monomers can be assembled into a circular ring shape.

[0065] Each expansion ball 3 includes two expansion ball monomers sandwiched between a sliding ring monomer and an extrusion ring monomer, and the two expansion ball monomers can be assembled into a circular ring shape.

[0066] Each drive ring 12 includes two drive ring monomers rotatably connected to the upper ring and the lower ring. The two drive ring monomers can be assembled into a circular ring shape. One end of the drive ring monomer is provided with a protrusion, and the other end of the drive ring monomer is provided with a groove. The protrusion and the groove are detachably connected.

[0067] Reference Figure 6The detection assembly includes a probe 20, a controller 21, a screen 22, an alarm 23, and a power supply 24. The probe 20 is a pressure probe. One end of the probe 20 passes through the collar 1 and communicates with the collar 1 between the two expansion balls 3. It is used to detect pressure changes inside the collar 1. The controller 21 is electrically connected to the probe 20. The screen 22, the alarm 23, and the power supply 24 are electrically connected to the controller 21. The controller 21, the screen 22, the alarm 23, and the power supply 24 are all located outside the collar 1. The power supply 24 is a battery or dry cell to provide power for the operation of the detection assembly. The probe 20 feeds back the detected pressure changes to the controller 21, and the pressure value is displayed on the screen 22. When the pressure changes, the alarm 23 sounds an alarm. Preferably, the alarm 23 in the present invention is a buzzer.

[0068] The working principle of this utility model:

[0069] The first step is to unlock the other end of the upper ring and the other end of the lower ring and place them around the gas pipeline;

[0070] In the second step, under the action of the first compression spring 10, the protrusion 11 is located on the side of the second inclined surface 14 close to the axis of the ring 1, and the sliding block 6 moves along the radial direction of the ring 1 toward the axis of the ring 1, which can overcome the force of the second compression spring 17 on the extrusion ring 4, so that the extrusion ring 4 moves toward the middle of the ring 1. At this time, the expansion ball 3 is compressed so that it is close to the peripheral side of the gas pipeline. At this time, the ring 1 can form a closed space with the gas pipeline under the action of the expansion balls 3 at both ends. The probe 20 is used to measure the pressure change in the ring 1, and when the pressure changes, the alarm information is issued by the alarm 23.

[0071] The third step, when it is necessary to change the measuring position along the axial direction of the gas pipeline, use both hands to reversely rotate the operating handle 15 so that the second inclined surface 14 contacts the protrusion 11 on the side away from the axis of the ring 1. Under the action of the second inclined surface 14, the sliding block 6 moves toward the side away from the axis of the ring 1, and the extrusion ring 4 can move in the direction away from the middle of the ring 1 under the action of the second compression spring 17. At this time, the expansion ball 3 is stretched, and the gap between the expansion ball 3 and the gas pipeline is matched. At this time, the detection device of the utility model can be moved along the axial direction of the gas pipeline.

[0072] Step 4: After the movement is complete, both hands stop exerting force on the operating handle 15. Under the action of the first compression spring 10, the sliding block 6 moves along the radial direction of the collar 1 toward the axis of the collar 1, overcoming the second compression spring 17's blocking force on the extrusion ring 4 and moving toward the center of the collar 1. At this point, the expansion balls 3 are compressed, causing them to rest against the side of the gas pipeline. Under the action of the expansion balls 3 at both ends, the collar 1 forms a sealed space with the gas pipeline, and the probe 20 measures the pressure change within the collar 1. Repeating steps 3 and 4 allows for detection at different locations in the gas pipeline.

[0073] Step 5: After the detection is completed, the other end of the upper ring and the other end of the lower ring are unlocked, and the detection device of the utility model is disassembled from the side of the gas pipeline.

[0074] In the description of the present invention, it should be understood that the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present invention.

[0075] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements to the technical solutions of the present invention made by ordinary technicians in this field should fall within the scope of protection determined by the claims of the present invention.

Claims

1. A gas pipeline leakage detection device, characterized in that: include: A sleeve (1) for being sleeved around the side of a gas transmission pipeline; Two sealing assemblies are spaced apart along the axial direction of the collar (1), the sealing assemblies comprising a stop ring (2), an expansion ball (3) and an extrusion ring (4) which are annular and arranged in sequence from the middle of the collar (1) toward the end, the stop ring (2) and the extrusion ring (4) being fixedly connected and slidably connected to the inner side wall of the collar (1), and the expansion ball (3) being fixedly clamped between the two; and A detection component is connected to the collar (1) between the two expansion balls (3), and is used to detect leakage in the gas pipeline.

2. The gas pipeline leakage detection device according to claim 1, characterized in that: It also includes a driving assembly for driving the extrusion ring (4) to move closer to or away from the corresponding stop ring (2).

3. The gas pipeline leakage detection device according to claim 2, characterized in that: The drive assembly includes: A plurality of sliding grooves (5) are provided at intervals on the outer edge of one side of the extrusion ring (4) away from the middle of the collar (1); a plurality of sliding blocks (6) arranged in one-to-one correspondence with the plurality of sliding grooves (5), the sliding blocks (6) being provided with a first inclined surface (7) slidably connected to the sliding grooves (5) along the radial direction of the collar (1), the first inclined surface (7) being inclined in a direction close to the axis of the collar (1) toward a direction away from the middle of the collar (1); and An elastic member is arranged between the stop ring (2) and the extrusion ring (4), and is used to drive the extrusion ring (4) to move away from the middle of the sleeve ring (1).

4. The gas pipeline leakage detection device according to claim 3, characterized in that: The drive assembly further includes: a plurality of first sliding rods (8) fixedly connected to the plurality of sliding blocks (6) in a one-to-one correspondence, wherein the first sliding rods (8) are located on a side of the sliding block (6) away from the axis of the collar (1); and A stepped through hole (9) is arranged on the inner wall of the collar (1) and corresponds to the sliding block (6) in a one-to-one manner. The large hole of the stepped through hole (9) is located on the side of the small hole of the stepped through hole (9) close to the axis of the collar (1). The sliding block (6) is slidably connected to the large hole of the stepped through hole (9). The first sliding rod (8) is slidably connected to the stepped through hole (9). A first compression spring (10) is arranged in the large hole of the stepped through hole (9). The first compression spring (10) is sleeved on the circumference of the first sliding rod (8), and the two ends of the first compression spring (10) are respectively connected to the sliding block (6) and the large hole end wall of the stepped through hole (9).

5. The gas pipeline leakage detection device according to claim 4, characterized in that: The drive assembly further includes: a protrusion (11) fixedly connected to a side wall of the sliding block (6) away from the middle of the collar (1); and A driving ring (12) is annular and rotatably connected to the inner side wall of the collar (1); the driving ring (12) is arranged one-to-one on the side of the extrusion ring (4) away from the middle of the collar (1); a blind groove (13) is arranged one-to-one corresponding to the protrusion (11) on the side wall of the driving ring (12) close to the middle of the collar (1); the blind groove (13) is provided with a second inclined surface (14) slidably connected to the protrusion (11); the self-rotation of the driving ring (12) can drive the sliding block (6) to move along the radial direction of the collar (1) toward and away from the axial direction of the collar (1).

6. The gas pipeline leakage detection device according to claim 5, characterized in that: The second inclined surfaces (14) on the two drive rings (12) at both ends of the collar (1) have opposite inclination directions, and an operating handle (15) is provided on the side wall of the second inclined surface (14) away from the middle of the collar (1).

7. The gas pipeline leakage detection device according to claim 5, characterized in that: The elastic member comprises: A second sliding rod (16) having one end fixedly connected to the stop ring (2) and the other end passing through the extrusion ring (4); and A second compression spring (17) is sleeved on the circumferential side of the second sliding rod (16), and the two ends of the second compression spring (17) are respectively connected to the stop ring (2) and the extrusion ring (4) used in conjunction with the second compression spring (17). Along the axial direction of the sleeve ring (1), the force exerted by the second compression spring (17) on the extrusion ring (4) is smaller than the force exerted by the sliding block (6) on the extrusion ring (4).

8. The gas pipeline leakage detection device according to claim 7, characterized in that: A slot (18) is provided on the side wall of the stop ring (2) away from the center of the collar (1), and a plug plate (19) is provided on the side wall of the extrusion ring (4) close to the center of the collar (1). The plug plate (19) is slidably connected to the slot (18), and the slot (18) and the plug plate (19) are located between the second sliding rod (16) and the expansion ball (3).

9. The gas pipeline leakage detection device according to claim 8, characterized in that: The detection component includes: A probe (20), one end of which passes through the collar (1) and is in communication with the collar (1) between the two expansion balls (3); a controller (21) electrically connected to the probe (20); and A screen (22), an alarm (23) and a power supply (24) are electrically connected to the controller (21), and the controller (21), the screen (22), the alarm (23) and the power supply (24) are all located outside the collar (1).

10. The gas pipeline leakage detection device according to claim 9, characterized in that: The collar (1) comprises an upper collar and a lower collar that are detachably connected, the upper collar and the lower collar being capable of forming a circular ring, one end of the upper collar and one end of the lower collar being hinged, and the other end of the upper collar and the other end of the lower collar being detachably connected; Each of the stop rings (2) comprises two stop ring monomers fixedly connected to the upper ring and the lower ring in a one-to-one correspondence, and the two stop ring monomers can be assembled into a circular ring shape; Each of the extrusion rings (4) comprises two extrusion ring monomers which are slidably connected to the upper sleeve ring and the lower sleeve ring in a one-to-one correspondence, and the two extrusion ring monomers can be assembled into a circular ring shape; Each of the expansion balls (3) comprises two expansion ball monomers sandwiched between a stop ring monomer and an extrusion ring monomer, and the two expansion ball monomers can be assembled into a circular ring shape; Each driving ring (12) comprises two driving ring monomers rotatably connected to the upper ring and the lower ring, and the two driving ring monomers can be assembled into a circular ring shape.

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