Air tightness testing fixture for pipeline welding position

Abstract

The utility model relates to the technical field of air tightness detection tools, and discloses an air tightness detection tool for a pipeline welding position. The pipe opening positioning and inflating mechanism comprises a mounting plate, an inflating head, a pressing plate, a mounting opening, a limiting hole, a connecting rod and a pressing rod, the mounting plate is arranged on the workbench in the mode that the mounting plate can reciprocate in the axial direction of the pipeline, the inflating head is arranged on the mounting plate in the mode that the inflating head can reciprocate in the axial direction of the pipeline, the pressing plate is fixedly arranged on the inflating head, and the connecting rod is arranged on the pressing plate. The installation opening is formed in the pressing plate in a penetrating mode, an inflation pipeline of the inflation head is communicated with the installation opening, the limiting hole is formed in the pressing plate, the connecting rod is movably arranged on the installation plate in a rotating mode, and the middle of the pressing rod is connected to the connecting rod in a rotating mode. The pressing rod can do reciprocating motion and swing in the axial direction of the pipeline to clamp the pipeline.

Description

Technical Field

[0001] The utility model relates to the technical field of air tightness testing tools, in particular to an air tightness testing tool used for pipeline welding positions. Background Art

[0002] A gas-tightness test fixture for pipeline welds is a specialized device used to detect gas leaks at welds. This test fixture assesses weld quality by filling the pipeline system with gas at a certain pressure and then observing or measuring whether gas leaks from the weld. Using a gas-tightness test fixture for weld quality inspection is an essential step in pipeline engineering.

[0003] Existing airtightness test fixtures still have problems: some existing pipeline weld airtightness test structures rely heavily on manual operation. However, this approach often results in low test efficiency and is not easily able to meet the current demand for efficient testing. Furthermore, manual operation is susceptible to subjective factors and different personnel experience and habits, which can lead to inaccurate docking, resulting in poor fit between the installation port and the pipe. Controlling the clamping force is also difficult, making it difficult to achieve uniformity.

[0004] Therefore, there is an urgent need for an airtightness inspection tool for pipeline welding positions to solve the above problems. Utility Model Content

[0005] Based on the above, the purpose of the present invention is to provide an airtightness inspection tool for pipeline welding positions to solve the problem of inaccurate docking between the installation port and the pipeline and uneven clamping of the pipeline.

[0006] In order to solve the above technical problems, the utility model adopts the following technical solution: an airtightness inspection tool for pipeline welding position, comprising:

[0007] Workbench;

[0008] The pipe mouth positioning and inflation mechanism includes a mounting plate, an inflation head, a pressure plate, a mounting port, a limiting hole, a connecting rod and a pressure rod. The mounting plate is reciprocatingly arranged on the workbench along the axial direction of the pipe, and the inflation head is reciprocatingly arranged on the mounting plate along the axial direction of the pipe. The pressure plate is fixedly arranged on the inflation head, and the mounting port is penetrated and arranged on the pressure plate. The inflation pipe of the inflation head is connected to the mounting port, and the limiting hole is arranged on the pressure plate. The connecting rod is movably rotated on the mounting plate, and the middle part of the pressure rod is rotatably connected to the connecting rod. The pressure rod can reciprocate and swing along the axial direction of the pipe to clamp the pipe.

[0009] As a preferred solution of an airtightness inspection tool for pipeline welding positions, it also includes a detection component, which is arranged on the workbench, and the detection component is used to detect the geometric quantities of the pipeline.

[0010] As a preferred solution for an airtightness inspection tool for pipeline welding positions, the inspection assembly includes a vertical plate and a reference piece. The vertical plates are symmetrically and fixedly arranged on a workbench. A positioning hole is left on the top of the vertical plate, and the reference piece is mounted on the positioning hole.

[0011] As a preferred solution for an airtightness inspection tool for a pipeline welding position, the two ends and the top end of the positioning port are in an open state, and the two ends of the positioning port are set as mounting grooves and limiting grooves that are connected to each other. The mounting grooves are set on the opposite inner sides of the symmetrical vertical plates, and the limiting grooves are set on the opposite outer sides of the symmetrical vertical plates. The width of the mounting groove is smaller than the width of the limiting groove.

[0012] As a preferred solution for the air tightness inspection tool for pipeline welding positions, it also includes a fixing mechanism, which is arranged on the workbench and is used to fix the mounting plate.

[0013] As a preferred solution for an airtightness inspection tool for a pipeline welding position, the fixing mechanism includes a frame plate, a slot, a connecting rod, a handle and a movable plate. The frame plate is fixedly mounted on a workbench, the slot is arranged on the top surface of the frame plate, and both ends of the slot are open. The connecting rod is installed in the slot, the handle is fixedly arranged at one end of the connecting rod, the movable plate is rotatably arranged at the other end of the connecting rod, and the movable plate is fixedly connected to the mounting plate.

[0014] As a preferred solution for the air tightness inspection tool for pipeline welding positions, it also includes a driving component, which is arranged on the workbench. The driving component is driven and connected to the mounting plate to drive the mounting plate to reciprocate along the axial direction of the pipeline.

[0015] As a preferred solution for an airtightness inspection tool for pipeline welding positions, the driving assembly includes a driving member, a guide rail and a slider. The guide rail is arranged on the workbench in a vertical direction along the axial direction of the pipeline. The slider is slidably connected to the guide rail along the vertical direction along the axial direction of the pipeline. The driving member is arranged on the workbench and is driven and connected to the slider. The mounting plate is fixed to the slider.

[0016] As a preferred solution for an airtightness inspection tool for a pipeline welding position, it also includes a protective component, which is arranged on the workbench and is used to prevent the pipeline from being displaced, shaken or misplaced.

[0017] As a preferred solution for an airtightness inspection tool for pipeline welding positions, the protective assembly includes a protective plate, a limit plate and a fastener. The protective plate is fixedly arranged on the workbench, the limit plate is detachably mounted on the protective plate, and the fastener is screwed onto the limit plate.

[0018] The beneficial effects of the present invention are as follows: the mounting plate is reciprocating along the axial direction of the pipe, and the inflation head is reciprocatingly arranged on the mounting plate along the axial direction of the pipe, so that the mounting opening and the limiting hole can match the pipe, and the pipe welding position can be accurately sealed and docked, ensuring the effectiveness and accuracy of inflation testing. The pressure rod is reciprocating and swinging along the axial direction of the pipe to clamp the pipe together with the pressure plate, which enhances the consistency of pipe clamping and can firmly fix the pipe, preventing the pipe from displacement or loosening during the inflation test process, thereby ensuring the reliability and stability of the test results and providing good testing conditions for accurately judging the airtightness of the pipe welding position. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the overall structure of the first direction of an airtightness inspection tool for pipeline welding provided by the utility model;

[0020] Figure 2 for Figure 1 A partial enlarged view of middle A;

[0021] Figure 3 This is a schematic diagram of the overall structure of the second direction of an airtightness inspection tool for pipeline welding provided by the utility model;

[0022] Figure 4 This is a schematic diagram of the overall structure of the third direction of an airtightness inspection tool for pipeline welding provided by the utility model;

[0023] Figure 5 A schematic diagram of the disassembly of the mating port and the pipe port of an airtightness inspection tool for pipe welding provided by the present invention;

[0024] Figure 6 The utility model provides an overall structural diagram of a fixing mechanism in an airtightness inspection tool for pipeline welding positions.

[0025] Among them, the figure marks in the figure are: 1. workbench; 2. pipe mouth positioning and inflation mechanism; 21. mounting plate; 22. inflation head; 23. pressure plate; 24. mounting port; 25. limiting hole; 26. connecting rod; 27. pressure rod; 3. detection component; 31. vertical plate; 32. reference part; 33. positioning port; 331. mounting slot; 332. limiting slot; 4. fixing mechanism; 41. shelf plate; 42. slot; 43. connecting rod; 44. handle; 45. movable plate; 5. driving component; 51. driving member; 52. guide rail; 53. slider; 6. protection component; 61. protection plate; 62. limiting plate; 63. fastener; 7. vertical frame; 8. limiter; 9. avoidance hole. DETAILED DESCRIPTION

[0026] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0027] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0028] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0029] In the description of this embodiment, the terms "up", "down", "left", "right" and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of description and simplification of operation, 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 cannot be understood as limitations on the present invention.

[0030] In the description of the present invention, unless otherwise specified, the meaning of "plurality" is two or more. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0031] In one embodiment of the present invention, Figure 1-6 As shown, an airtightness inspection tool for pipeline welding positions is provided, comprising a workbench 1 and a pipe opening positioning and inflation mechanism 2. The pipe opening positioning and inflation mechanism 2 comprises a mounting plate 21, an inflation head 22, a pressure plate 23, an installation opening 24, a limiting hole 25, a connecting rod 26, and a pressure rod 27. The mounting plate 21 is arranged on the workbench 1 so as to be reciprocatable along the axial direction of the pipeline. The inflation head 22 is arranged on the mounting plate 21 so as to be reciprocatable along the axial direction of the pipeline. The pressure plate 23 is fixedly arranged on the inflation head 22. The installation opening 24 is provided through the pressure plate 23. The inflation pipe of the inflation head 22 is connected to the installation opening 24. The limiting hole 25 is provided on the pressure plate 23. The connecting rod 26 is movably and rotatably arranged on the mounting plate 21. The middle part of the pressure rod 27 is rotatably connected to the connecting rod 26. The pressure rod 27 can swing back and forth along the axial direction of the pipeline to clamp the pipeline.

[0032] The airtightness test fixture for pipe welding locations provided in this embodiment is reciprocatable along the axial direction of the pipe via a mounting plate 21. The inflation head 22 is reciprocatably mounted on the mounting plate 21 along the axial direction of the pipe, allowing the mounting opening 24 and the limiting hole 25 to engage the pipe, accurately sealing the pipe welding location and ensuring the effectiveness and accuracy of inflation testing. The pressure rod 27 reciprocates and swings along the axial direction of the pipe, clamping the pipe together with the pressure plate 23, firmly securing the pipe and enhancing the consistency of the pipe clamping. This prevents the pipe from shifting or loosening during the inflation test, thereby ensuring the reliability and stability of the test results and providing excellent testing conditions for accurately determining the airtightness of the pipe welding location.

[0033] The mechanical process of the airtightness test fixture for the pipe welding position provided in this embodiment is as follows: first, the test fixture is placed near the pipe to be tested, and the mounting plate 21 is reciprocated along the axial direction of the pipe and adjusted to a suitable position so that the inflation head 22 set on the mounting plate 21 can also reciprocate along the axial direction of the pipe, thereby enabling the mounting port 24 and the limiting hole 25 to cooperate with the pipe port to achieve precise docking. After completing the preliminary position adjustment and docking, the pressure rod 27 is operated to swing back and forth along the axial direction of the pipe, thereby clamping the pipe and ensuring that the pipe is in a stable state during the inspection process and will not loosen or move. Next, the inflation device is started, and the test gas is filled into the pipe through the inflation head 22. Then, the relevant detection instrument or sensor is used to monitor the air pressure changes and other parameters in the pipe to determine whether the airtightness of the pipe welding position meets the requirements. It can also be determined by direct observation or listening whether the pipe welding position is leaking.

[0034] Preferably, the number of nozzle positioning and inflating mechanisms 2 can vary with the orientation of the pipe opening. In this embodiment, there are two pipe openings, and two sets of nozzle positioning and inflating mechanisms 2 can be provided to accommodate these openings. Specifically, the movement direction of the positioning and inflating mechanisms varies with the axial direction of the pipe opening. Of course, in other embodiments, the number of nozzle positioning and inflating mechanisms 2 can be set based on actual conditions, for example, three or four.

[0035] In this embodiment, the direction of one pipe opening is perpendicular to the workbench 1, and the moving direction of the mounting plate 21, the inflation head 22 and the pressure plate 23 can be set to be parallel to the direction of one pipe opening, and moved to the top of the pipe opening, and the swing direction of the pressure rod 27 is to swing along the direction of the connecting rod 26 to the bottom of the pipe opening, thereby clamping the pipe opening; while the direction of the other pipe opening is parallel to the workbench 1, and the moving direction of the mounting plate 21, the inflation head 22 and the pressure plate 23 can be set to be parallel to the direction of one pipe opening, and moved to one side of the pipe opening, and the swing direction of the pressure rod 27 is to swing along the direction of the connecting rod 26 to the other side of the pipe opening, thereby clamping the pipe opening. That is, the mounting plate 21, the inflation head 22, and the pressure plate 23 can be stably fixed at one position of the pipe opening, and at the same time, after the pressure rod 27 swings along the direction of the connecting rod 26 to the other side of the pipe opening, it cooperates with the mounting plate 21, the inflation head 22, and the pressure plate 23 to achieve a tight clamping of the pipe opening, thereby providing a stable and reliable connection and sealing environment for subsequent inflation, testing, or other related operations, ensuring the smooth operation and safety and accuracy during the operation, avoiding gas leakage or other unexpected situations, and ensuring the efficient and orderly development of the entire workflow. Of course, in other embodiments, the reciprocating direction of the mounting plate 21, the inflation head 22, and the pressure plate 23 and the swinging direction of the pressure rod 27 can be set according to the actual direction of the pipe opening.

[0036] Preferably, a stand 7 is provided on the workbench 1, and the drive assembly 5 is arranged on the stand 7. The drive assembly 5 is driven and connected to the mounting plate 21 to drive the mounting plate 21 to reciprocate along the axial direction of the pipeline. The stand 7 allows the drive assembly 5 to be stably installed, ensures its stable operation, provides support and positioning for air tightness detection, facilitates the precise movement of the mounting plate 21, and improves the comprehensiveness and accuracy of the detection. The drive assembly 5 includes a drive member 51, a guide rail 52 and a slider 53. The guide rail 52 is fixed on the stand 7, and the guide rail 52 is arranged on the workbench 1 in a direction perpendicular to the axial direction of the pipeline. The slider 53 is slidably connected to the guide rail 52 in a direction perpendicular to the axial direction of the pipeline, the drive member 51 is arranged on the workbench 1 and is driven and connected to the slider 53, and the mounting plate 21 is fixed to the slider 53. The guide rail 52 of the drive assembly 5 cooperates with the slider 53 to ensure that the movement of the mounting plate 21 is precise and stable. The drive member 51 provides stable power to make the movement of the mounting plate 21 controllable, which improves the accuracy, reliability and efficiency of air tightness detection, reduces the influence of human factors, and is conducive to accurately judging the air tightness condition of the pipeline.

[0037] Preferably, a limiter 8 is provided on the stand 7 to limit the movement position of the mounting plate 21, prevent the mounting plate 21 from excessive movement resulting in inaccurate docking with the pipeline or damage to the equipment, ensure the smooth progress of the detection process, improve the accuracy and stability of the detection, and play a positive role in detecting air tightness.

[0038] Preferably, after the position of the mounting plate 21 is debugged, it needs to be fixed. A cylinder can be used for positioning, or a fixing mechanism 4 can be set for fixing. The fixing mechanism 4 is set on the workbench 1, and the fixing mechanism 4 is used to fix the mounting plate 21. The fixing mechanism 4 includes a frame plate 41, a slot 42, a connecting rod 43, a handle 44 and a movable plate 45. The frame plate 41 is fixedly mounted on the workbench 1, the slot 42 is set on the top surface of the frame plate 41, and the two ends of the slot 42 are open. The connecting rod 43 is installed in the slot 42, the handle 44 is fixedly set at one end of the connecting rod 43, and the movable plate 45 is rotatably set at the other end of the connecting rod 43. The degree of rotation flexibility of the movable plate 45 can be adjusted according to actual needs by independently selecting the diameter of the connecting shaft. The movable plate 45 and the mounting plate 21 can be fixedly connected by screws. The fixing mechanism 4 can firmly fix the mounting plate 21 after the position is debugged, preventing the sealing connection with the pipeline from being affected by the movement of the mounting plate 21 during detection, ensuring that the detection results are accurate and reliable, avoiding gas leakage, and carrying out the detection under precise control, which is conducive to accurately judging the air tightness of the pipeline and improving the detection quality and efficiency.

[0039] During use, the mounting plate 21 can be adjusted to a suitable position through the guide rail 52 and the slider 53, the movable plate 45 can be fixed with screws after being aligned with the mounting plate 21, and then the handle 44 can be held to install the connecting rod 43 into the slot 42.

[0040] Preferably, multiple cylinders can be installed on the mounting plate 21 to respectively control the stroke of the inflation head 22, the pressure plate 23 and the pressure rod 27. When in use, the first cylinder can be driven to drive the inflation head 22 and the pressure plate 23 to tighten the pipe opening, and then the second cylinder can be driven to drive the pressure rod 27, so that the pressure rod 27 swings on the movable connecting rod 26 and clamps the pipe opening.

[0041] Preferably, the pressure rods 27 are symmetrically arranged on the mounting plate 21 to provide uniform pressure on the installation pipe opening to ensure a tight fit to prevent gas leakage, make the operation stable and reliable, avoid deformation or damage of the pipe opening, facilitate installation and adjustment, and improve work efficiency.

[0042] Preferably, an escape hole 9 for evading the fastener is provided at one end of the pressure rod 27 close to the limiting hole.

[0043] Preferably, the limiting hole 25 can be pre-installed with a fastening nail. When the installation opening 24 is engaged with the pipe opening, the position of the pipe opening is fixed, achieving precise positioning of the pipe opening and enhancing connection stability. Alternatively, it can be left empty, allowing the fastening nail on the pipe opening to engage with the limiting hole 25, which can also enhance connection stability.

[0044] Preferably, when other locations on the pipeline also need to be inspected, an inspection assembly 3 can be installed on the workbench 1 for inspection. The inspection assembly 3 includes vertical plates 31 and reference members 32. The vertical plates 31 are symmetrically and fixedly installed on the workbench 1. A positioning opening 33 is left at the top of the vertical plates 31, and the reference members 32 are mounted on the positioning opening 33. The ends and the top of the positioning opening 33 are open. The ends of the positioning opening 33 are provided with a mounting groove 331 and a limiting groove 332 that are connected to each other. The mounting groove 331 is provided on the opposite inner sides of the symmetrical vertical plates 31, and the limiting groove 332 is provided on the opposite outer sides of the symmetrical vertical plates 31. The width of the mounting groove 331 is smaller than the width of the limiting groove 332. It provides a stable support structure for the reference part 32, ensuring that the reference part 32 will not shake or move during the detection process, thereby ensuring the accuracy and stability of the detection; on the other hand, the open positioning port 33 and the installation slots 331 and limit slots 332 of different widths facilitate the installation and adjustment of the reference part 32, improve the efficiency of the detection operation, and provide strong protection for the detection of other positions of the pipeline.

[0045] Preferably, if other locations on the pipeline also need to be inspected, an inspection assembly 3 can be installed on the workbench 1 for inspection. The inspection assembly 3 includes uprights 31 and reference members 32. The uprights 31 are symmetrically spaced and fixed on the workbench 1, with the spacing convenient for pipe placement. A positioning opening 33 is provided at the top of the uprights 31, and the reference members 32 are mounted on the positioning opening 33. The ends and top of the positioning opening 33 are open, facilitating the direct placement of the reference members 32.

[0046] Furthermore, the two ends of the positioning opening 33 are configured as interconnected mounting slots 331 and limiting slots 332. The mounting slots 331 are located on the opposite inner sides of the symmetrical upright plate 31, while the limiting slots 332 are located on the opposite outer sides of the symmetrical upright plate 31. The width of the mounting slots 331 is smaller than that of the limiting slots 332. This provides a stable support structure for the reference member 32, ensuring that it does not wobble or shift during testing, thus ensuring accuracy and stability. Furthermore, it facilitates the installation and adjustment of the reference member 32, improves the efficiency of testing operations, and provides a strong guarantee for testing other locations on the pipeline.

[0047] Preferably, the airtightness test fixture for pipeline welding positions also includes a protective assembly 6, which is arranged on the workbench 1. The protective assembly 6 is used to prevent the pipeline from displacement, shaking or misalignment. The protective assembly 6 includes a protective plate 61, a limiting plate 62 and a fastener 63. The protective plate 61 is fixedly arranged on the workbench 1 at intervals. The limiting plate 62 is detachably mounted on the protective plate 61, making it easy to place or remove the pipeline opening. The fastener 63 is screwed onto the limiting plate 62 to fix and tighten it, preventing the pipeline from displacement, shaking or misalignment, ensuring smooth testing and accurate and reliable results, and is versatile and flexible.

[0048] Preferably, a checking tool, such as a go / no-go gauge, can be placed on the workbench for measurement. In addition, a trolley can be installed under the workbench to facilitate the movement of the workbench.

[0049] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention is disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technician familiar with the profession can make some changes or modifications to equivalent embodiments of the above-disclosed technical contents without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent changes and modifications made to the above embodiments according to the technology of the present invention, which do not depart from the content of the technical solution of the present invention, are within the scope of the technical solution of the present invention.

Claims

1. An airtightness tester for pipeline welding, characterized in that: include: Workbench; The pipe mouth positioning and inflation mechanism includes a mounting plate, an inflation head, a pressure plate, a mounting port, a limiting hole, a connecting rod and a pressure rod. The mounting plate is reciprocatingly arranged on the workbench along the axial direction of the pipe, and the inflation head is reciprocatingly arranged on the mounting plate along the axial direction of the pipe. The pressure plate is fixedly arranged on the inflation head, and the mounting port is penetrated and arranged on the pressure plate. The inflation pipe of the inflation head is connected to the mounting port, and the limiting hole is arranged on the pressure plate. The connecting rod is movably rotated on the mounting plate, and the middle part of the pressure rod is rotatably connected to the connecting rod. The pressure rod can reciprocate and swing along the axial direction of the pipe to clamp the pipe.

2. The airtightness inspection tool for pipeline welding according to claim 1, characterized in that: It also includes a detection component, which is arranged on the workbench and is used to detect the geometric quantities of the pipeline.

3. The airtightness inspection tool for pipeline welding according to claim 2, characterized in that: The detection assembly includes a vertical plate and a reference member. The vertical plates are symmetrically and fixedly arranged on the workbench. A positioning hole is left on the top of the vertical plate, and the reference member is mounted on the positioning hole.

4. The airtightness inspection tool for pipeline welding according to claim 3, characterized in that: The two ends and the top end of the positioning port are in an open state, and the two ends of the positioning port are set as mounting grooves and limiting grooves that are connected to each other. The mounting grooves are set on the relatively inner sides of the symmetrical vertical plates, and the limiting grooves are set on the opposite outer sides of the symmetrical vertical plates. The width of the mounting grooves is smaller than the width of the limiting grooves.

5. An airtightness inspection tool for pipeline welding according to any one of claims 1 to 4, characterized in that: It also includes a fixing mechanism, which is arranged on the workbench and is used to fix the mounting plate.

6. The airtightness inspection tool for pipeline welding according to claim 5, characterized in that: The fixing mechanism includes a frame plate, a slot, a connecting rod, a handle and a movable plate. The frame plate is fixedly mounted on the workbench, the slot is arranged on the top surface of the frame plate, and both ends of the slot are open. The connecting rod is installed in the slot, the handle is fixedly arranged at one end of the connecting rod, and the movable plate is rotatably arranged at the other end of the connecting rod. The movable plate is fixedly connected to the mounting plate.

7. An airtightness inspection tool for pipeline welding according to any one of claims 1 to 4, characterized in that: It also includes a driving component, which is arranged on the workbench and is drivingly connected to the mounting plate to drive the mounting plate to reciprocate along the axial direction of the pipeline.

8. The airtightness inspection tool for pipeline welding according to claim 7, characterized in that: The driving assembly includes a driving member, a guide rail and a slider. The guide rail is arranged on the workbench along the vertical direction of the pipeline axis. The slider is slidably connected to the guide rail along the vertical direction of the pipeline axis. The driving member is arranged on the workbench and is driven and connected to the slider. The mounting plate is fixed to the slider.

9. An airtightness inspection tool for pipeline welding according to any one of claims 1 to 4, characterized in that: It also includes a protection component, which is arranged on the workbench and is used to prevent the pipeline from being displaced, shaken or misplaced.

10. The airtightness inspection tool for pipeline welding according to claim 9, characterized in that: The protection assembly includes a protection plate, a limiting plate and a fastener. The protection plate is fixedly arranged on the workbench at intervals. The limiting plate is detachably mounted on the protection plate. The fastener is screwed onto the limiting plate.

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