Tool for detecting air tightness of pipeline

Abstract

This utility model provides a tooling for testing the airtightness of pipelines, belonging to the field of pipeline testing technology. It includes a positioning base plate, a fixing member, and a limiting component. The positioning base plate is used to abut against the bottom of the connector of the test piece. The fixing member is disposed on the positioning base plate and connected to the test piece. The limiting component includes a positioning plate disposed on the positioning base plate and opposite to the fixing member. The positioning plate has a positioning hole opposite to the connector's socket, through which the core tube to be tested is inserted. A limiting pressure plate is slidably connected to the positioning plate in the vertical direction. When the limiting pressure plate slides downward to press the core tube to be tested, a limiting component passes between the limiting pressure plate and the positioning plate. The tooling for testing the airtightness of pipelines provided by this utility model can avoid damage and wear caused by inaccurate positioning and can improve the connection stability and positioning accuracy during the testing of the core tube to be tested.

Description

Technical Field

[0001] This utility model belongs to the field of pipeline testing technology, and more specifically, it relates to a tooling for testing the airtightness of pipelines. Background Technology

[0002] Air tightness testing of air conditioning pipes plays a crucial role in ensuring the normal operation of air conditioners, improving energy efficiency, protecting equipment, and ensuring safety. After pressurization, the core tube of the air conditioning pipe must undergo air tightness testing to check whether it meets the standard air tightness test pressure value. Furthermore, the core tube product must not be damaged during the testing process.

[0003] In the existing technology, when performing core tube testing, the core tube needs to be aligned with the testing port first, and then experienced operators need to quickly insert it so that the core tube can be inserted into the testing port of the test piece. However, since there are no obvious force-bearing fastening points on the outer wall of the core tube, it is difficult to maintain pressure, and improper installation can easily cause the product to be bumped and scratched. Utility Model Content

[0004] The purpose of this utility model is to provide a tooling for testing the air tightness of pipelines, which aims to solve the technical problem that the installation and positioning of air conditioning core pipes is inconvenient and easily causes pipeline damage when conducting air tightness testing.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is: to provide a tooling for testing the airtightness of pipelines, comprising:

[0006] A positioning base plate is used to abut against the bottom of the connector of the detection piece;

[0007] A fixing element, disposed on the positioning base plate and connected to the detection element; and

[0008] The limiting component includes a positioning plate disposed on the positioning base plate and disposed opposite to the fixing member; the positioning plate is provided with a positioning hole opposite to the socket of the connector, and the positioning hole is used to insert the core tube to be inspected; a limiting pressure plate is slidably connected to the positioning plate in the vertical direction.

[0009] Among them, when the limiting pressure plate slides down to press the core tube to be inspected, a limiting component is provided between the limiting pressure plate and the positioning plate.

[0010] In one possible implementation, the top of the positioning plate is provided with a downwardly recessed pressing groove, and the positioning hole is a semi-circular hole that is recessed downward from the top of the positioning plate, and the axial direction of the positioning hole passes through both sides of the pressing groove.

[0011] The bottom of the limiting pressure plate is provided with an upwardly recessed relief groove;

[0012] The limiting pressure plate slides downward into the pressing groove, and the positioning groove and the positioning hole press together to press the core tube to be inspected.

[0013] In some embodiments, the pressing groove is an upward-opening V-shaped groove, the lower end of the limiting pressure plate is a V-shaped structure that matches the shape of the V-shaped groove, and when the limiting pressure plate is inserted into the pressing groove, the side wall of the limiting pressure plate and the side wall of the pressing groove are correspondingly pressed together.

[0014] In one possible implementation, the limiting element includes:

[0015] A positioning pin is inserted axially between the positioning plate and the limiting pressure plate along the positioning hole to limit the positioning plate and the limiting pressure plate.

[0016] The connector is connected to the positioning pin at one end and fixed to the positioning base plate at the other end.

[0017] In some embodiments, the connector includes:

[0018] The mounting block is fixedly connected to the tail end of the positioning pin and extends away from the positioning hole;

[0019] The elastic element is fixed at one end to the mounting block and at the other end to the positioning base plate.

[0020] For example, the positioning base plate is provided with an upwardly protruding first connecting ear, and the mounting block is provided with a second connecting ear extending away from the positioning hole; the two ends of the elastic member are connected to the first connecting ear and the second connecting ear respectively.

[0021] In one possible implementation, the fastener includes:

[0022] Mounting plate, connected to positioning base plate;

[0023] The limiting sleeve is fixed at its lower end to the mounting plate; the inner hole of the limiting sleeve is coaxial with the positioning hole; a detection tube for the detection element is inserted inside the limiting sleeve.

[0024] In some embodiments, the mounting plate is detachably connected to the positioning base plate via threaded connectors.

[0025] In some embodiments, the bottom of the fixing member is provided with a groove suitable for the positioning base plate to pass through, and the fixing member is slidably connected to the positioning base plate along the axial direction of the positioning hole.

[0026] For example, the fixing component is provided with two movable nuts, which are symmetrically distributed on both sides of the slide groove; the positioning base plate is provided with rotating screws on both sides, which are parallel to the axis of the positioning hole, and the two rotating screws are screwed into the two movable nuts one by one.

[0027] The solution shown in this application, compared with the prior art, fixes the detection component using a fixing component and a positioning base plate. By setting a positioning plate and positioning holes, with the positioning holes aligned with the connector's socket, the core tube to be tested is positioned relative to the connector's socket after being inserted into the positioning hole. This ensures accurate connection between the core tube and the connector socket, thus avoiding wear and damage caused by center misalignment. The positioning plate and limiting pressure plate slide up and down, causing the limiting pressure plate to press down on the core tube to be tested, thereby forming a force-bearing fastening point on the core tube. The pressure-holding mechanism facilitates pressure maintenance, preventing the core tube under test from detaching from the connector socket under pressure during the testing process, thus affecting the testing progress. The limiting component is used to fix the relative position between the positioning plate and the limiting plate after the limiting pressure plate presses the core tube under test, preventing the limiting pressure plate from detaching from the positioning plate and affecting the positioning of the core tube under test, which can effectively improve the connection stability of the core tube under test. The tooling for pipeline airtightness testing provided in this application can avoid damage and wear caused by inaccurate positioning, facilitate the positioning and installation of the core tube under test, and improve the connection stability of the core tube under test during the testing process. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 Schematic diagram of the structure of the tooling for testing the airtightness of pipelines provided in the embodiments of this utility model Figure 1 ;

[0030] Figure 2 This is a schematic diagram of the structure of the limiting pressure plate provided in the embodiment of this utility model;

[0031] Figure 3 This is an enlarged structural diagram of the positioning plate provided in an embodiment of the present utility model;

[0032] Figure 4 Schematic diagram of the structure of the tooling for testing the airtightness of pipelines provided in the embodiments of this utility model Figure 2 .

[0033] In the diagram: 1. Positioning base plate; 11. Rotating screw; 2. Fixing component; 21. Mounting plate; 211. Slide groove; 22. Limiting sleeve; 23. Moving nut; 3. Positioning plate; 31. Positioning hole; 32. Pressing groove; 4. Limiting pressure plate; 41. Relief pressure groove; 5. Limiting component; 51. Positioning pin; 52. Connecting component; 521. Mounting block; 522. Elastic component; 53. First connecting ear; 54. Second connecting ear; 6. Detection component; 7. Core tube to be inspected. Detailed Implementation

[0034] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0035] It should be noted that when an element is referred to as being "set on" another element, it can be directly on or indirectly on that other element. It should be understood that the terms "width," "upper," "lower," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0036] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0037] Please refer to the following: Figures 1 to 4 The present invention provides a tooling for testing the airtightness of pipelines. The tooling includes a positioning base plate 1, a fixing member 2, and a limiting component. The positioning base plate 1 abuts against the bottom of the connector of the test piece 6. The fixing member 2 is disposed on the positioning base plate 1 and connected to the test piece 6. The limiting component includes a positioning plate 3 disposed on the positioning base plate 1 and opposite to the fixing member 2. The positioning plate 3 has a positioning hole 31 opposite to the connector's socket, and the core tube 7 to be tested passes through the positioning hole 31. A limiting pressure plate 4 is slidably connected to the positioning plate 3 in the vertical direction. When the limiting pressure plate 4 slides downward to press the core tube 7 to be tested, a limiting member 5 passes between the limiting pressure plate 4 and the positioning plate 3.

[0038] It should be noted that the connector and test tube of the test piece 6 are existing technologies and can be used to test the airtightness of the core tube 7 under test, so they will not be described in detail here.

[0039] For example, the positioning hole 31 on the positioning plate 3 is a circular hole provided on the positioning plate 3. The limiting pressure plate 4 is slidably connected to one side of the positioning plate 3. When the limiting pressure plate 4 slides down, the bottom of the limiting pressure plate 4 presses down on the core tube 7 to be inspected. After the core tube 7 to be inspected is pressed down, the relative position between the positioning plate 3 and the limiting pressure plate 4 is fixed by the limiting member 5.

[0040] Optionally, the part of the limiting pressure plate 4 that presses against the core tube 7 under test is set as an arc-shaped structure that matches the outer peripheral wall of the core tube 7 under test, so that the upper side of the core tube 7 under test is subjected to balanced force.

[0041] The tooling for pipeline airtightness testing provided in this application has a simple and clear overall structure, with each component having a clear division of labor, making it easy to understand and manufacture. The tooling is inexpensive to design and manufacture and has strong applicability.

[0042] It should be understood that when installing the core tube to be tested 7, the operator needs to insert the core tube to be tested 7 into the positioning hole 31, slide the limiting pressure plate 4 downward, and fix the positioning plate 3 and the limiting pressure plate 4 by the limiting component 5. Then the operator holds the core tube to be tested 7 and quickly inserts it into the socket of the connector to achieve the connection between the core tube to be tested 7 and the test component 6.

[0043] The pipe airtightness testing fixture provided by this utility model, compared with the prior art, fixes the testing piece 6 by fixing the fixing piece 2 and the positioning base plate 1, and by setting the positioning plate 3 and the positioning hole 31, with the positioning hole 31 facing the socket of the connector, it can be ensured that after the core tube 7 to be tested is inserted into the positioning hole 31, the core tube 7 to be tested is aligned with the socket of the connector, thereby ensuring accurate connection between the core tube 7 to be tested and the socket of the connector, and thus avoiding wear and damage caused by center misalignment; the positioning plate 3 and the limiting pressure plate 4 slide up and down, so that the limiting pressure plate 4 presses down on the core tube 7 to be tested, thereby forming a pressure on the core tube 7 to be tested. The clamping point is designed to facilitate pressure holding and prevent the core tube 7 under test from detaching from the connector socket under pressure during the testing process, thus affecting the testing progress. The limiting member 5 is used to fix the relative position between the positioning plate 3 and the limiting plate 4 after the limiting pressure plate 4 clamps the core tube 7 under test, preventing the limiting pressure plate 4 from detaching from the positioning plate 3 and affecting the positioning of the core tube 7 under test, which can effectively improve the connection stability of the core tube 7 under test. The tooling for pipeline airtightness testing provided in this application can avoid damage and wear caused by inaccurate positioning, facilitate the positioning and installation of the core tube 7 under test, and improve the connection stability of the core tube 7 under test during the testing process.

[0044] Please see Figure 2 and Figure 3In some possible embodiments, the top of the positioning plate 3 is provided with a downwardly recessed pressing groove 32, and the positioning hole 31 is a semi-circular hole that is recessed downward from the top of the positioning plate 3, and the axial direction of the positioning hole 31 passes through the two side walls of the pressing groove 32; the bottom of the limiting pressure plate 4 is provided with an upwardly recessed relief pressing groove 41; wherein, the limiting pressure plate 4 slides downward into the pressing groove 32, and the relief pressing groove 41 and the positioning hole 31 press the core tube 7 to be inspected tightly from top to bottom.

[0045] By setting a downwardly recessed pressing groove 32, it is convenient for the limiting pressure plate 4 to be pressed downward into the pressing groove 32; and since the positioning hole 31 axially penetrates the two side walls of the pressing groove 32, the positioning hole 31 is divided into two positioning sub-holes located on both sides of the pressing groove 32; the limiting pressure plate 4 is limited between the two side walls of the pressing groove 32. When the core tube 7 to be inspected is pressed down, the core tube 7 to be inspected presents a downwardly recessed arc shape at the limiting pressure plate 4, and can be restored to the height position flush with the socket at the two positioning sub-holes. Therefore, when the core tube 7 to be inspected passes through the positioning hole 31, it can be supported by the positioning sub-hole on the other side of the pressing groove 32 to ensure the alignment accuracy between the core tube 7 to be inspected and the socket of the connector.

[0046] It should be understood that the tight clamping of the semi-circular hole and the clearance groove 41 effectively reduces the shaking of the core tube 7 under test during the testing process, improves the accuracy and reliability of the test, and avoids the impact of core tube shaking on the airtightness test results.

[0047] Please see Figure 3 In some embodiments, the pressing groove 32 is an upward-opening V-shaped groove, the lower end of the limiting pressure plate 4 is a V-shaped structure that matches the shape of the V-shaped groove, and when the limiting pressure plate 4 is inserted into the pressing groove 32, the side wall of the limiting pressure plate 4 abuts against the side wall of the pressing groove 32.

[0048] The V-shaped structure design allows for greater lateral pressure to be generated when the limiting pressure plate 4 slides downward, thereby enhancing the clamping force on the core tube and ensuring a tighter connection between the core tube and the test piece 6, which is beneficial to improving the accuracy of airtightness testing. By making the lower end of the limiting pressure plate 4 a V-shaped structure that matches the shape of the V-groove, the lower end of the limiting pressure plate 4 can be easily pressed downward into the pressing groove 32.

[0049] Furthermore, by making the side wall of the limiting pressure plate 4 abut against the side wall of the pressing groove 32, the connection strength between the limiting pressure plate 4 and the positioning plate 3 can be enhanced, making the limiting pressure plate 4 more stable when pressing the core tube 7 to be inspected, thereby better ensuring the stability of the core tube during the inspection process.

[0050] For example, the limiting pressure plate 4 and the pressing groove 32 are connected by an interference fit, that is, the width dimension of the pressing groove 32 along the axial direction of the positioning hole 31 is smaller than the width dimension of the limiting pressure plate 4 along the axial direction of the positioning hole 31, so that the side wall of the limiting pressure plate 4 and the side wall of the pressing groove 32 are correspondingly pressed together.

[0051] Furthermore, after the tooling has been used for a period of time, the width of the V-groove along the axial direction of the positioning hole 31 will increase under the pressure of the limiting pressure plate 4. At this time, a pad can be set between the limiting pressure plate 4 and the groove wall of the pressing groove 32 to press the limiting pressure plate 4.

[0052] For example, the pressing groove 32 extends horizontally through the positioning plate 3 along the axial direction perpendicular to the positioning hole 31 to facilitate observation of the pressing length of the limiting pressure plate 4.

[0053] Please see Figure 1 In some possible embodiments, the limiting member 5 includes a positioning pin 51 and a connecting member 52; the positioning pin 51 passes through the positioning hole 31 axially between the positioning plate 3 and the limiting pressure plate 4 to limit the positioning plate 3 and the limiting pressure plate 4; one end of the connecting member 52 is connected to the positioning pin 51, and the other end is fixed on the positioning base plate 1.

[0054] The positioning pin 51 is used to pass between the positioning plate 3 and the limiting pressure plate 4 to achieve effective positioning between the positioning plate 3 and the limiting pressure plate 4. It can accurately limit the position of the limiting pressure plate 4 and prevent it from shifting during the pressing of the core tube 7 to be inspected. This ensures the accuracy of the direction and position of the pressing force on the core tube and improves the reliability of the positioning.

[0055] The connector 52 is used to connect the positioning pin 51 to the positioning base plate 1 to prevent the positioning pin 51 from being lost and to facilitate the direct removal of the positioning pin 51 for positioning after the limiting plate 4 is pressed.

[0056] Please see Figure 1 In some embodiments, the connector 52 includes a mounting block 521 and an elastic member 522; the mounting block 521 is fixedly connected to the tail end of the positioning pin 51 and extends away from the positioning hole 31; one end of the elastic member 522 is fixed on the mounting block 521 and the other end is fixed on the positioning base plate 1.

[0057] Considering that the positioning pin 51 is small in size and inconvenient to operate during installation and force application, this application provides an installation block 521. The installation block 521 is used to fix the positioning pin 51 at its tail end, making it convenient for the operator to insert the positioning pin 51 by holding the installation block 521. Specifically, the installation block 521 is provided with an installation hole suitable for the insertion of the positioning pin 51. The positioning pin 51 is fixed to the installation block 521 by an interference fit between the installation hole and the positioning pin 51, or the tail end of the positioning pin 51 is welded and fixed to the installation block 521.

[0058] The elastic element 522 is provided to facilitate the pulling of the positioning pin 51, thereby accommodating the distance between the positioning pin 51 and the mounting point of the positioning base plate 1. Specifically, the elastic element 522 can be a spring, an elastic rope, or an elastic band, etc., and the specific structure can be selectively set according to actual needs.

[0059] Please see Figure 1 For example, the positioning base plate 1 is provided with an upwardly protruding first connecting ear 53, and the mounting block 521 is provided with a second connecting ear 54 extending in a direction away from the positioning hole 31; the two ends of the elastic member 522 are correspondingly connected to the first connecting ear 53 and the second connecting ear 54.

[0060] The two ends of the elastic element 522 are respectively connected to the first connecting ear 53 and the second connecting ear 54. This connection method is simple and direct, facilitating the installation and removal of the elastic element 522 and reducing the maintenance cost of the tooling. For example, when the elastic element 522 is a spring, the hook at the end of the spring can be directly hung on the first connecting ear 53 and the second connecting ear 54. When the elastic element 522 is an elastic pull rope, its two ends can be directly tied to the first connecting ear 53 and the second connecting ear 54, making the operation simple.

[0061] Please see Figure 1 In some possible embodiments, the fixing member 2 includes a mounting plate 21 and a limiting sleeve 22; the mounting plate 21 is connected to the positioning base plate 1; the lower end of the limiting sleeve 22 is fixed to the mounting plate 21; the inner hole of the limiting sleeve 22 is coaxial with the positioning hole 31; and the detection tube of the detection member 6 is inserted inside the limiting sleeve 22.

[0062] The inner hole of the limiting sleeve 22 is coaxial with the positioning hole 31, which enables the detection tube of the detection component 6 to be accurately aligned with the core tube 7 to be tested, avoiding the problem of misalignment of the connector axis, ensuring the smooth flow of the detection airflow or liquid in the pipeline, avoiding detection errors caused by pipeline misalignment, and improving the accuracy of air tightness detection.

[0063] In addition, limiting the detection tube within the limiting sleeve 22 enhances the stability of the detection tube in the tooling, reduces problems such as loose connection or changes in airtightness that may occur due to shaking of the detection tube during the detection process, and ensures the reliability of the detection results.

[0064] Please see Figure 1 In some embodiments, the mounting plate 21 is detachably connected to the positioning base plate 1 via a threaded connector.

[0065] Specifically, threaded fasteners can be the structure of connecting bolts or connecting screws.

[0066] Mounting plate 21 is detachably connected to positioning base plate 1 via threaded connectors, allowing for convenient and quick disassembly of mounting plate 21, offering good flexibility and high maintenance efficiency. The detachable design allows the tooling to be replaced with different testing parts 6 according to different testing needs, enhancing the tooling's versatility and applicability, and reducing the company's equipment procurement costs.

[0067] Optionally, multiple sets of connecting holes are provided on the positioning base plate 1, and the multiple sets of connecting holes are spaced apart along the axial direction of the positioning hole 31; the mounting plate 21 is connected in one of the sets of connecting holes. By connecting the mounting plate 21 in multiple different sets of connecting holes, the position of the mounting plate 21 on the positioning base plate 1 can be adjusted.

[0068] Please see Figure 4 In some embodiments, the bottom of the fixing member 2 is provided with a groove 211 suitable for the positioning base plate 1 to pass through, and the fixing member 2 is slidably connected to the positioning base plate 1 along the axial direction of the positioning hole 31.

[0069] By allowing the fixing member 2 to slide along the axial direction of the positioning hole 31 onto the positioning base plate 1, the installation position of the detection member 6 can be easily adjusted to accommodate different lengths of the inserted core tube 7 to be inspected. This allows the tooling to adapt to core tubes 7 and detection members 6 of different lengths, expanding the applicability of the tooling and improving its practicality and economy.

[0070] Please see Figure 4 For example, the fixing member 2 is provided with two movable nuts 23, which are symmetrically distributed on both sides of the slide groove 211; the positioning base plate 1 is provided with rotating screws 11 on both sides, which are parallel to the axis of the positioning hole 31, and the two rotating screws 11 are screwed to the two movable nuts 23 in a one-to-one correspondence.

[0071] By rotating the screw 11, the movable nut 23 can drive the fixing part 2 to move on the rotating screw 11, thereby adjusting the distance between the fixing part 2 and the positioning plate 3, thus changing the distance between the connector and the core tube 7 to be tested, realizing fine adjustment of the connection between the test part 6 and the core tube 7 to be tested, thereby more accurately ensuring the accuracy of airtightness testing.

[0072] Furthermore, the adjustment method using the threaded connection between the rotating screw 11 and the movable nut 23 is simple to operate, requiring no complex equipment or tools. Operators can easily make fine adjustments according to actual testing needs, improving the convenience of tooling use and testing efficiency. At the same time, the symmetrically distributed movable nut 23 and rotating screw 11 structure ensures the stability and balance of the fixing part 2 during the adjustment process.

[0073] Optionally, a knob is provided at one end of the rotating screw 11. By rotating the knob, the rotating screw 11 is rotated, thereby driving the movable nut 23 to move.

[0074] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A tooling for testing the airtightness of pipelines, characterized in that, include: Positioning base plate (1) is used to abut against the bottom of the connector of the detection piece (6); A fixing member (2) is disposed on the positioning base plate (1) and connected to the detection member (6); and The limiting component includes a positioning plate (3) disposed on the positioning base plate (1) and disposed opposite to the fixing member (2); the positioning plate (3) is provided with a positioning hole (31) opposite to the socket of the connector, and the core tube (7) to be inspected is inserted through the positioning hole (31); a limiting pressure plate (4) is slidably connected on the positioning plate (3) in the vertical direction; When the limiting pressure plate (4) slides down to press the core tube (7) to be inspected, a limiting member (5) is provided between the limiting pressure plate (4) and the positioning plate (3).

2. The tooling for testing the airtightness of pipelines as described in claim 1, characterized in that, The top of the positioning plate (3) is provided with a downwardly recessed pressing groove (32), and the positioning hole (31) is a semi-arc-shaped hole that is recessed downward from the top of the positioning plate (3), and the axial direction of the positioning hole (31) passes through both sides of the pressing groove (32). The bottom of the limiting pressure plate (4) is provided with an upwardly recessed relief pressure groove (41); The limiting pressure plate (4) slides downward into the pressing groove (32), and the relief pressure groove (41) and the positioning hole (31) press the core tube (7) to be inspected tightly.

3. The tooling for testing the airtightness of pipelines as described in claim 2, characterized in that, The pressing groove (32) is an upward-opening V-shaped groove. The lower end of the limiting pressure plate (4) is a V-shaped structure that matches the shape of the V-shaped groove. When the limiting pressure plate (4) is inserted into the pressing groove (32), the side wall of the limiting pressure plate (4) abuts against the side wall of the pressing groove (32).

4. The tooling for testing the airtightness of pipelines as described in claim 1, characterized in that, The limiting member (5) includes: A positioning pin (51) is inserted through the positioning hole (31) along the axial direction between the positioning plate (3) and the limiting pressure plate (4) to limit the positioning plate (3) and the limiting pressure plate (4); The connector (52) is connected at one end to the positioning pin (51) and at the other end to the positioning base plate (1).

5. The tooling for testing the airtightness of pipelines as described in claim 4, characterized in that, The connector (52) includes: The mounting block (521) is fixedly connected to the tail end of the positioning pin (51) and extends away from the positioning hole (31); The elastic element (522) is fixed at one end to the mounting block (521) and at the other end to the positioning base plate (1).

6. The tooling for testing the airtightness of pipelines as described in claim 5, characterized in that, The positioning base plate (1) is provided with an upwardly protruding first connecting ear (53), and the mounting block (521) is provided with a second connecting ear (54) extending away from the positioning hole (31); the two ends of the elastic member (522) are correspondingly connected to the first connecting ear (53) and the second connecting ear (54).

7. The tooling for testing the airtightness of pipelines as described in claim 1, characterized in that, The fastener (2) includes: Mounting plate (21) is attached to the positioning base plate (1); The lower end of the limiting sleeve (22) is fixed on the mounting plate (21); the inner hole of the limiting sleeve (22) is coaxial with the positioning hole (31); the detection tube of the detection element (6) is inserted inside the limiting sleeve (22).

8. The tooling for testing the airtightness of pipelines as described in claim 7, characterized in that, The mounting plate (21) is detachably connected to the positioning base plate (1) via a threaded connector (52).

9. The tooling for testing the airtightness of pipelines as described in claim 7, characterized in that, The bottom of the fixing member (2) is provided with a groove (211) suitable for the positioning base plate (1) to pass through, and the fixing member (2) is slidably connected to the positioning base plate (1) along the axial direction of the positioning hole (31).

10. The tooling for testing the airtightness of pipelines as described in claim 9, characterized in that, The fixing member (2) is provided with two movable nuts (23), which are symmetrically distributed on both sides of the slide groove (211); the positioning base plate (1) is provided with rotating screws (11) on both sides, which are parallel to the axis of the positioning hole (31), and the two rotating screws (11) are screwed to the two movable nuts (23) in a one-to-one correspondence.

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