Air tightness detection tool and air tightness detection method for flange-free end face pipeline product

Abstract

The invention relates to the technical field of air tightness detection, in particular to an air tightness detection tool and method for a flange-free end face pipeline product, and the tool comprises a centering clamp, and further comprises a sealing assembly, a quick release rod and an air line connector, the inner side of the centering clamp is used for fixing a test end of the product, and the outer side of the centering clamp is used for fixing a test end of the product. A temporary flange structure is formed on the test end of the product along the circumferential direction; one end of the sealing assembly is used for abutting against the port of the product testing end so as to seal the port of the product testing end. According to the air tightness detection tool and the air tightness detection method for the flange-free end face pipeline product, the centering clamp is additionally arranged at the testing end of the product cavity channel to form a temporary flange structure, the cavity channel of the product can be conveniently plugged by the sealing assembly, meanwhile, the centering clamp can be used for testing products with different outer diameters, and the testing efficiency is improved. The method is good in universality, simple and easy to implement, and meets the test requirements of the product in the early development stage.

Description

Technical Field

[0001] The present invention relates to the technical field of air tightness detection, and in particular to an air tightness detection tool and an air tightness detection method for flangeless end face pipeline products. Background Art

[0002] Air tightness testing is an important step to ensure the quality and reliability of intake and exhaust pipe products. This type of test evaluates the performance and reliability of the product under actual working conditions by accurately measuring the leakage rate of the product, thereby ensuring the effective operation of the final product such as the engine. In order to conduct this test, an air tightness test fixture is required to assist in completion.

[0003] The air tightness test tool is an indispensable auxiliary device when conducting air tightness tests. For example, patent number CN220670865U discloses an air tightness test tool for engine pipelines. At present, the method of using the air tightness test tool is to first physically isolate all the cavities of the intake and exhaust pipes or other products with air tightness requirements from the outside world, usually using tools such as silicone pads and tooling pressure plates. After that, pressure is applied to the product under test through an air compressor, and the air tightness of the product is tested and evaluated based on specific technical parameters.

[0004] In the early stages of product development, designers and engineers usually want to use low-cost, versatile test solutions for preliminary verification. There are simple ways to achieve this for cavities with flanged end faces on intake and exhaust pipe products, or cavities sealed with sealing threads, but for those cavities without fixed clamping positions, there is currently a lack of a simple, easy-to-use and versatile test solution that cannot meet the testing needs in the early stages of product development. Summary of the invention

[0005] In view of this, the present invention proposes an air tightness testing tool and an air tightness testing method for flangeless end face pipeline products. A centering fixture is added to the test end of the product cavity to form a temporary flange structure, which facilitates the sealing assembly to seal the product cavity. At the same time, the centering fixture can be used for testing products with different outer diameters. It has good versatility, is simple and easy to use, and meets the testing needs of the early product development stage.

[0006] The technical solution of the present invention is achieved in this way:

[0007] On the one hand, the present invention provides a gas tightness detection tool for flangeless end face pipeline products, including a centering fixture, a sealing assembly, a quick release rod and a gas line connector, wherein:

[0008] The inner side of the centering fixture is used to fix the test end of the product, so that a temporary flange structure is formed on the test end of the product along the circumferential direction;

[0009] One end of the sealing assembly is used to abut against the port of the product test end to close the port of the product test end;

[0010] The centering fixture and the sealing assembly are provided with mounting holes, and the quick-release rod is inserted into the mounting hole to fix the centering fixture and the sealing assembly together;

[0011] The sealing assembly is provided with a vent hole, one end of which is connected to the test end of the product, and the other end of which is screwed to the gas line connector;

[0012] The gas line connector is used to connect a gas source.

[0013] On the basis of the above technical solution, preferably, the centering fixture includes a fixing ring and a tightening bolt, wherein:

[0014] The fixing ring is sleeved on the test end of the product, and the fixing ring is provided with the mounting hole;

[0015] There are a plurality of the tightening bolts, which are arranged radially along the center of the fixing ring;

[0016] The tightening bolt passes through the fixing ring and is threaded, and one end of the tightening bolt abuts against the product.

[0017] On the basis of the above technical solution, preferably, the centering fixture further includes a V-shaped plate, wherein:

[0018] The V-shaped plate is rotatably provided with one end of each of the tightening bolts close to the product;

[0019] One end of the V-shaped plate abuts against the product.

[0020] On the basis of the above technical solution, preferably, the sealing assembly includes a pressure plate, a permanent magnet ring and a sealing gasket, wherein:

[0021] The sealing gasket is concentrically arranged at one end of the pressing plate and fixedly connected, and the sealing gasket is clamped between the pressing plate and the product;

[0022] The pressing plate is provided with the mounting hole;

[0023] The permanent magnetic ring is embedded on the end of the pressing plate away from the sealing gasket and is concentric, so that the pressing plate is magnetically connected to the product;

[0024] A plurality of weight-reducing holes are provided between the permanent magnet ring and the sealing gasket, the weight-reducing holes are provided through the pressing plate, and the permanent magnet ring and the pressing plate are sealed and connected;

[0025] The vent hole is concentric with the permanent magnet ring, and the vent hole passes through the pressing plate.

[0026] On the basis of the above technical solution, preferably, the quick release rod comprises a shaft rod, a lever and a limit plate, wherein:

[0027] One end of the shaft is hingedly connected to the lever, and the other end passes through the mounting hole and is clamped with the limit plate;

[0028] One end of the lever is held against the centering fixture;

[0029] An annular groove is arranged on one end of the shaft away from the lever, and a U-shaped groove is arranged on the limiting plate, and the inner diameter of the U-shaped groove is equal to the inner diameter of the annular groove;

[0030] The limit plate is sleeved on the inner side of the annular groove through the U-shaped groove, and one end of the limit plate abuts against one end of the sealing assembly away from the centering fixture, and the other end abuts against the groove wall of the annular groove, and the limit plate is magnetically connected to the sealing assembly.

[0031] On the basis of the above technical solution, preferably, the shaft comprises a polished rod, a screw rod and a threaded seat, wherein:

[0032] One end of the polished rod is hingedly connected to the lever, and the other end is fixedly connected to the screw rod;

[0033] A threaded hole is arranged at one end of the threaded seat, one end of the screw rod is screwed into the threaded hole, and the annular groove is arranged at the other end of the threaded seat.

[0034] On the basis of the above technical solution, preferably, anti-slip patterns are provided on the side of the threaded seat away from the end of the screw rod and on the side of the limiting plate.

[0035] On the basis of the above technical solution, preferably, it also includes a hard washer, wherein:

[0036] The hard washer is screwed on the centering fixture at a position corresponding to the mounting hole, and the hard washer is concentric with the mounting hole;

[0037] The shaft passes through the center of the hard washer;

[0038] One end of the lever abuts against one end of the hard pad.

[0039] On the basis of the above technical solution, preferably, there are a plurality of quick-release rods in a circumferential annular array along the centering fixture.

[0040] On the other hand, the present invention further provides an air tightness detection method, which uses the above-mentioned air tightness detection tool for flangeless end face pipeline products, and is characterized in that it includes the following steps:

[0041] S1. The centering fixture is arranged on the test end of the product, the test end of the product is extended into the inner side of the centering fixture, and then the centering fixture is fixedly connected to the product to form a temporary flange structure on the test end of the product;

[0042] S2, magnetically adsorbing one end of the sealing assembly onto the test end of the product;

[0043] S3, inserting the shaft into the mounting hole, magnetically adsorbing the limit plate on the sealing assembly, and sleeve the limit plate on the inner side of the annular groove through the U-shaped groove;

[0044] S4, flipping the lever to one side to tighten the shaft rod, so as to fix the sealing assembly to the centering fixture through the quick-release rod;

[0045] S5, connecting the gas line connector to a gas source through a gas line, and delivering compressed air into the product through the gas source for subsequent air tightness testing;

[0046] S6. After the test, open the quick-release rod and remove the centering fixture and the sealing assembly.

[0047] The air tightness detection tool and air tightness detection method for flange-free end face pipeline products of the present invention have the following beneficial effects compared with the prior art:

[0048] (1) By adding a centering fixture to the test end of the product cavity to form a temporary flange structure, it is convenient for the sealing component to seal the product cavity. At the same time, the centering fixture can be used to test products with different outer diameters. It has good versatility, is simple and easy to use, and meets the testing needs in the early stage of product development.

[0049] (2) By setting a magnetic connection between the pressure plate and the product, it is convenient to pre-fix the pressure plate on the test end of the product, and then it is convenient to align the mounting hole on the pressure plate with the mounting hole on the fixing ring, so as to facilitate the rapid installation of the quick release rod. At the same time, by setting a magnetic connection between the limit plate and the sealing assembly, it is convenient to pre-fix the limit plate, so that the limit plate is not easy to fall off during installation, and then it is convenient to quickly install the quick release rod.

[0050] (3) A permanent magnetic ring is set to be embedded in the end of the pressure plate away from the sealing gasket and is concentric with it, so that the test end of the product does not directly contact the permanent magnetic ring. When the pressure plate and the test end of the product are pressed against each other, the permanent magnetic ring will not be damaged by the pressing force. At the same time, a weight reduction hole is set between the permanent magnetic ring and the sealing gasket, which is used to reduce the weight of the sealing component and facilitate hand-held operation, and to reduce the obstruction between the permanent magnetic ring and the test end of the product, so that the permanent magnetic ring can be better magnetically adsorbed with the product, thereby improving the pre-fixing effect of the pressure plate and preventing it from falling off. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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 creative work.

[0052] Figure 1 A three-dimensional diagram of a use state of a gas tightness detection tool for flange-less end face pipeline products of the present invention;

[0053] Figure 2 It is a front view of a gas tightness detection tool for flangeless end face pipeline products of the present invention;

[0054] Figure 3 It is a cross-sectional view taken along the line AA of the present invention;

[0055] Figure 4 It is a BB sectional view of the present invention;

[0056] Figure 5 A three-dimensional diagram of a V-shaped plate of the present invention;

[0057] Figure 6 A three-dimensional diagram of the gas line joint of the present invention;

[0058] Figure 7 A three-dimensional diagram of the weight-reducing hole of the present invention;

[0059] Figure 8 It is a partial exploded view of the quick release lever of the present invention;

[0060] Fig. 9 It is a three-dimensional diagram of the limiting plate of the present invention;

[0061] In the figure: 1. Centering fixture; 2. Sealing assembly; 3. Quick-release rod; 4. Gas line connector; 5. Product; 6. Hard gasket; 11. Fixing ring; 12. Jack bolt; 13. V-shaped plate; 14. Hard pad; 21. Pressure plate; 22. Permanent magnet ring; 23. Sealing gasket; 31. Shaft; 32. Lever; 33. Limiting plate; 201. Vent hole; 202. Weight reduction hole; 301. Mounting hole; 302. Ring groove; 303. U-shaped groove; 304. Threaded hole; 311. Polished rod; 312. Screw; 313. Threaded seat. DETAILED DESCRIPTION

[0062] The following will be combined with the specific implementation of the present invention to clearly and completely describe the technical solution in the present invention. Obviously, the described implementation is only a part of the implementation of the present invention, not all of the implementation. Based on the implementation of the present invention, all other implementations obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0063] like Figure 1-9 As shown, an air tightness detection tool for flangeless end face pipeline products of the present invention comprises a centering fixture 1, a sealing assembly 2, a quick-release rod 3 and an air line connector 4.

[0064] Among them, the inner side of the centering fixture 1 is used to fix the test end of the product 5, so that a temporary flange structure is formed on the circumferential edge of the test end of the product 5. The product 5 refers to the engine intake and exhaust pipe without a fixed clamping position on the cavity. By adding the centering fixture 1 to the test end of the cavity of the product 5, it is convenient for the sealing component 2 to seal the cavity of the product 5. At the same time, the centering fixture 1 can also be used for testing products 5 with different outer diameters. It has good versatility, is simple and easy to use, and meets the testing needs of the product 5 in the early development stage.

[0065] One end of the sealing component 2 is used to abut the port of the test end of the product 5 to close the port of the test end of the product 5; a vent hole 201 is provided on the sealing component 2, one end of the vent hole 201 is connected to the test end of the product 5, and the other end is threadedly connected to the gas line connector 4; the gas line connector 4 is used to connect the gas source, and the compressed air output by the gas source can enter the interior of the product 5 through the vent hole 201 for air tightness testing.

[0066] The centering fixture 1 and the sealing assembly 2 are provided with mounting holes 301 , and the centering fixture 1 and the sealing assembly 2 are fixedly connected after the quick release rod 3 is inserted into the mounting hole 301 ; the centering fixture 1 and the sealing assembly 2 can be easily installed and removed by the quick release rod 3 .

[0067] In the above-mentioned air tightness detection tooling, Figure 5As shown, the centering fixture 1 includes a fixing ring 11 and a tightening bolt 12, wherein the fixing ring 11 is in a circular ring shape and is sleeved on the test end of the product 5. A mounting hole 301 is provided on the fixing ring 11 for installing the quick release rod 3; a plurality of tightening bolts 12 are provided on the fixing ring 11, wherein the plurality of tightening bolts 12 are radially arranged along the center of the fixing ring 11, and the tightening bolts 12 penetrate the fixing ring 11 and are screwed, and one end of the tightening bolt 12 abuts against the product 5, Figure 1 The number of the tightening bolts 12 shown in the figure is two.

[0068] When the centering fixture 1 needs to be installed on the product 5, the test end of the product 5 is inserted into the inner side of the fixing ring 11, and then the tightening bolt 12 is screwed so that one end thereof abuts against the pipe wall of the product 5, and the fixing ring 11 is fixed to the product 5 to realize the installation of the centering fixture 1.

[0069] like Figure 5 As shown, the centering clamp 1 also includes a V-shaped plate 13, wherein a V-shaped plate 13 is rotatably provided on one end of each tightening bolt 12 close to the product 5; one end of the V-shaped plate 13 is abutted against the product 5, and the V-shaped plate 13 facilitates the centering of the fixing ring 11 and the product 5, so that the tightening bolt 12 tightly holds the tube wall of the product 5 to enhance the fixing effect. To further enhance the fixing effect, a mesh structure with an anti-slip effect is provided on the inner side surface of the V-shaped plate 13 for anti-slip.

[0070] In the above-mentioned air tightness detection tooling, Figure 6 and Figure 7 As shown, the sealing assembly 2 includes a pressing plate 21, a permanent magnet ring 22 and a sealing gasket 23, wherein the sealing gasket 23 is concentrically arranged at one end of the pressing plate 21 and fixedly connected, and the sealing gasket 23 is clamped between the pressing plate 21 and the product 5; a mounting hole 301 is arranged on the pressing plate 21; the permanent magnet ring 22 is embedded in the end of the pressing plate 21 away from the sealing gasket 23 and is concentric, so that the pressing plate 21 is magnetically connected to the product 5; a plurality of weight-reducing holes 202 are arranged between the permanent magnet ring 22 and the sealing gasket 23, and the weight-reducing holes 202 are arranged through the pressing plate 21, and the permanent magnet ring 22 and the pressing plate 21 are sealed and connected; the vent hole 201 is concentric with the permanent magnet ring 22, and the vent hole 201 passes through the pressing plate 21.

[0071] When the sealing assembly 2 is fixedly connected to the centering fixture 1 , the sealing gasket 23 is clamped between the pressing plate 21 and the product 5 , and the matching surface between the pressing plate 21 and the product 5 is sealed by the sealing gasket 23 .

[0072] The function of the permanent magnetic ring 22 is to pre-fix the pressure plate 21. When installing the sealing assembly 2, the pressure plate 21 is pre-fixed on the test end of the product 5 through the permanent magnetic ring 22, so as to facilitate the alignment of the mounting hole 301 on the pressure plate 21 with the mounting hole 301 on the fixing ring 11, so as to facilitate the rapid installation of the quick release rod 3. At the same time, through magnetic adsorption, when installing the quick release rod 3, the pressure plate 21 is magnetically fixed on the product 5, so there is no need to hold the pressure plate 21 by hand, which provides convenience for the installation of the quick release rod 3.

[0073] In the above structure, the permanent magnetic ring 22 is not in direct contact with the test end of the product 5. When the pressing plate 21 and the test end of the product 5 abut against each other, the permanent magnetic ring 22 will not be damaged by the abutting force.

[0074] The function of the weight-reducing hole 202 is to reduce the weight of the sealing component 2, facilitate hand-held operation, and reduce the obstruction between the permanent magnetic ring 22 and the test end of the product 5, so that the permanent magnetic ring 22 can be better magnetically adsorbed with the product 5, thereby improving the pre-fixing effect of the pressure plate 21 and preventing it from falling off.

[0075] In the above-mentioned air tightness testing tool, there are several quick-release rods 3 in a circumferential annular array along the centering fixture 1. Figure 1 The number of quick release rods 3 shown in FIG. 4 is four, wherein Figure 4 As shown, the quick release rod 3 includes a shaft rod 31, a lever 32 and a limit plate 33, wherein one end of the shaft rod 31 is hingedly connected to the lever 32, and the other end passes through the mounting hole 301 and is clamped with the limit plate 33; one end of the lever 32 is abutted against the centering fixture 1; Figure 8 As shown, an annular groove 302 is provided on the end of the shaft rod 31 away from the lever 32, and a U-shaped groove 303 is provided on the limiting plate 33, and the inner diameter of the U-shaped groove 303 is equal to the inner diameter of the annular groove 302; the limiting plate 33 is sleeved on the inner side of the annular groove 302 through the U-shaped groove 303, and one end of the limiting plate 33 abuts against the end of the sealing component 2 away from the centering fixture 1, and the other end abuts against the groove wall of the annular groove 302, and the limiting plate 33 is magnetically connected to the sealing component 2.

[0076] When the quick-release lever 3 needs to be installed, the shaft rod 31 is inserted into the mounting hole 301 on the fixing ring 11 and the mounting hole 301 on the pressure plate 21 in sequence, and then the limiting plate 33 is placed in the ring groove 302. After being placed in, the limiting plate 33 is magnetically adsorbed on the pressure plate 21 to achieve pre-fixation, without the need for hand support, freeing both hands and facilitating subsequent operations. Then, the lever 32 is flipped 90 degrees to pull the shaft rod 31, and the shaft rod 31 drives the limiting plate 33 to press against the pressure plate 21 to achieve tightening and fixing.

[0077] In the above structure, the length of the shaft rod 31 is adjustable. Specifically, the shaft rod 31 includes a smooth rod 311, a screw rod 312 and a threaded seat 313, wherein one end of the smooth rod 311 is hingedly connected to the lever 32, and the other end is fixedly connected to the screw rod 312; one end of the threaded seat 313 is provided with a threaded hole 304, one end of the screw rod 312 is screwed into the threaded hole 304, and the other end of the threaded seat 313 is provided with an annular groove 302.

[0078] When the length of the shaft 31 needs to be adjusted, the threaded seat 313 is rotated to change the position of the screw 312 in the threaded hole 304. When the screw 312 moves toward the outside of the threaded hole 304, the length of the shaft 31 becomes longer, and vice versa. By changing the length of the shaft 31, the distance between the centering fixture 1 and the sealing assembly 2 can be adapted to the change, which facilitates the installation operation.

[0079] In order to facilitate the screwing of the threaded seat 313, an anti-slip pattern is provided on the side of the threaded seat 313 away from the screw rod 312. At the same time, in order to facilitate the placement and removal of the limiting plate 33, an anti-slip pattern is also provided on the side of the limiting plate 33. Fig. 9 As shown, in order to facilitate and quickly install the limit plates 33, two of the limit plates 33 can be set as an integrated structure, and the other two are set as an integrated structure, that is, the two limit plates 33 are connected by a square plate. After the connection, the openings of the two limit plates 33 at both ends of the square plate are in the same direction. When it is necessary to install the limit plates 33, hold the square plate, and then synchronously put the two limit plates 33 on the two adjacent ring grooves 302, so that the installation of the two limit plates 33 can be completed at the same time, which is relatively quick and convenient. After installation, tighten the quick release rod 3, the square plate and the pressure plate 21 abut against each other, and the limit plates 33 and the pressure plate 21 abut against each other. Due to the abutment, the tensile strength of the limit plates 33 can be improved, so that the limit plates 33 are not easily damaged by the quick release rod 3. When in use, the limit plates 33 are not easily deformed, thereby improving durability.

[0080] During the operation of the flip lever 32, the surface of the fixing ring 11 is easily worn when the lever 32 abuts against the fixing ring 11. To solve this problem, a hard washer 6 is provided on the centering fixture 1, wherein the hard washer 6 is screwed onto the centering fixture 1 at a position corresponding to the mounting hole 301, and the hard washer 6 and the mounting hole 301 are concentric. Specifically, one hard washer 6 is provided at each mounting hole 301 on the fixing ring 11, and the hard washer 6 is concentric with the mounting hole 301 at the corresponding position, and each hard washer 6 is screwed onto the fixing ring 11; the shaft 31 passes through the center of the hard washer 6; one end of the lever 32 abuts against one end of the hard pad 14.

[0081] When using the quick-release lever 3, its shaft 31 is passed through the hard washer 6, and then the lever 32 is flipped. During the process, the lever 32 and the hard washer 6 are in contact with each other, so that the fixing ring 11 can be protected by the hard washer 6, so that the lever 32 is not easy to damage the fixing ring 11. At the same time, the hard washer 6 is screwed on the centering fixture 1, which is convenient for later disassembly and replacement of the hard washer 6.

[0082] The above-mentioned air tightness testing tool is mainly used for air tightness testing of flange-free end face pipeline products, and its testing method includes the following steps:

[0083] S1. A centering fixture 1 is arranged on the test end of the product 5, the test end of the product 5 is extended into the inner side of the centering fixture 1, and then the centering fixture 1 is fixedly connected to the product 5, so that a temporary flange structure is formed on the test end of the product 5;

[0084] S2, magnetically adsorb one end of the sealing component 2 onto the test end of the product 5;

[0085] S3, insert the shaft 31 into the mounting hole 301, magnetically adsorb the limit plate 33 on the sealing assembly 2, and sleeve the limit plate 33 on the inner side of the annular groove 302 through the U-shaped groove 303;

[0086] S4, flip the lever 32 to one side to tighten the shaft rod 31, so as to fix the sealing assembly 2 and the centering fixture 1 through the quick release rod 3;

[0087] S5. Connect the gas line connector 4 to the gas source through the gas line, and deliver compressed air to the product 5 through the gas source for subsequent air tightness test. During the test, install a pressure gauge on the product 5, inject compressed air into the product 5 and then stop injecting air. Read the pressure value through the pressure gauge to judge the air tightness of the product 5. If the pressure drop does not exceed 0.2kPa after observing for ten minutes under the test pressure, it is considered qualified.

[0088] S6. After the test, flip the lever 32 in the opposite direction to loosen the quick-release lever 3, remove the limit plate 33, pull the shaft 31 out of the mounting hole 301, and then remove the sealing assembly 2, then loosen the tightening bolt 12, and remove the centering fixture 1.

[0089] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A gas tightness detection tool for flangeless end face pipeline products, comprising a centering fixture (1), characterized in that: It also includes a sealing assembly (2), a quick-release rod (3) and a gas line connector (4), wherein: The inner side of the centering fixture (1) is used to fix the test end of the product (5), so that a temporary flange structure is formed on the test end of the product (5) along the circumference; One end of the sealing component (2) is used to abut against the port of the test end of the product (5) to close the port of the test end of the product (5); The centering fixture (1) and the sealing assembly (2) are provided with mounting holes (301), and the centering fixture (1) and the sealing assembly (2) are fixedly connected after the quick-release rod (3) is inserted into the mounting hole (301); The sealing component (2) is provided with a vent hole (201), one end of the vent hole (201) is connected to the test end of the product (5), and the other end is threadedly connected to the gas line connector (4); The gas line connector (4) is used for connecting a gas source.

2. The air tightness detection tool for flange-free end face pipeline products according to claim 1, characterized in that: The centering fixture (1) comprises a fixing ring (11) and a tightening bolt (12), wherein: The fixing ring (11) is sleeved on the test end of the product (5), and the fixing ring (11) is provided with the mounting hole (301); A plurality of the tightening bolts (12) are provided, and the plurality of the tightening bolts (12) are radially arranged along the center of the fixing ring (11); The tightening bolt (12) passes through the fixing ring (11) and is threaded, and one end of the tightening bolt (12) abuts against the product (5).

3. The air tightness detection tool for flange-free end face pipeline products according to claim 2, characterized in that: The centering fixture (1) further comprises a V-shaped plate (13), wherein: The V-shaped plate (13) is rotatably provided on one end of each of the tightening bolts (12) close to the product (5); One end of the V-shaped plate (13) abuts against the product (5).

4. The air tightness detection tool for flangeless end face pipeline products according to claim 1, characterized in that: The sealing assembly (2) comprises a pressure plate (21), a permanent magnet ring (22) and a sealing gasket (23), wherein: The sealing gasket (23) is coaxially arranged at one end of the pressing plate (21) and fixedly connected, and the sealing gasket (23) is clamped between the pressing plate (21) and the product (5); The pressing plate (21) is provided with the mounting hole (301); The permanent magnetic ring (22) is embedded on one end of the pressing plate (21) away from the sealing gasket (23) and is concentric with the pressing plate (21) so that the pressing plate (21) is magnetically connected to the product (5); A plurality of weight-reducing holes (202) are provided between the permanent magnet ring (22) and the sealing gasket (23); the weight-reducing holes (202) are provided through the pressing plate (21); and the permanent magnet ring (22) and the pressing plate (21) are sealed and connected; The vent hole (201) is concentric with the permanent magnet ring (22), and the vent hole (201) passes through the pressing plate (21).

5. The air tightness detection tool for flangeless end face pipeline products according to claim 1, characterized in that: The quick-release rod (3) comprises a shaft rod (31), a lever (32) and a limit plate (33), wherein: One end of the shaft rod (31) is hingedly connected to the lever (32), and the other end passes through the mounting hole (301) and is clamped with the limiting plate (33); One end of the lever (32) is held against the centering fixture (1); An annular groove (302) is provided on one end of the shaft rod (31) away from the lever (32), and a U-shaped groove (303) is provided on the limiting plate (33), and the inner diameter of the U-shaped groove (303) is equal to the inner diameter of the annular groove (302); The limiting plate (33) is sleeved on the inner side of the annular groove (302) through the U-shaped groove (303), and one end of the limiting plate (33) abuts against one end of the sealing component (2) away from the centering fixture (1), and the other end abuts against the groove wall of the annular groove (302), and the limiting plate (33) is magnetically connected to the sealing component (2).

6. The air tightness detection tool for flangeless end face pipeline products according to claim 5, characterized in that: The shaft rod (31) comprises a polished rod (311), a screw rod (312) and a threaded seat (313), wherein: One end of the polished rod (311) is hingedly connected to the lever (32), and the other end is fixedly connected to the screw rod (312); A threaded hole (304) is provided at one end of the threaded seat (313), one end of the screw rod (312) is screwed into the threaded hole (304), and the annular groove (302) is provided at the other end of the threaded seat (313).

7. The air tightness detection tool for flangeless end face pipeline products according to claim 6, characterized in that: Anti-slip patterns are provided on the side of the threaded seat (313) at one end away from the screw rod (312) and on the side of the limiting plate (33).

8. The air tightness detection tool for flangeless end face pipeline products according to claim 7, characterized in that: Also included is a hard washer (6), wherein: The hard washer (6) is screwed onto the centering fixture (1) at a position corresponding to the mounting hole (301), and the hard washer (6) and the mounting hole (301) are concentric; The shaft (31) passes through the center of the hard washer (6); One end of the lever (32) abuts against one end of the hard pad (14).

9. The air tightness detection tool for flangeless end face pipeline products according to claim 1, characterized in that: There are a plurality of quick-release rods (3) in a circumferential annular array along the centering clamp (1).

10. An air tightness testing method, using the air tightness testing tool for flangeless end face pipeline products as claimed in claim 6, characterized in that: The following steps are involved: S1, arranging the centering fixture (1) on the test end of the product (5), extending the test end of the product (5) into the inner side of the centering fixture (1), and then fixing the centering fixture (1) and the product (5) to form a temporary flange structure on the test end of the product (5); S2, magnetically adsorbing one end of the sealing component (2) onto the test end of the product (5); S3, inserting the shaft rod (31) into the mounting hole (301), magnetically adsorbing the limit plate (33) onto the sealing assembly (2), and sleeve-mounting the limit plate (33) on the inner side of the annular groove (302) through the U-shaped groove (303); S4, flipping the lever (32) to one side to tighten the shaft rod (31), so as to fix the sealing assembly (2) and the centering fixture (1) via the quick-release rod (3); S5, connecting the gas line connector (4) to a gas source via a gas line, and delivering compressed air into the product (5) via the gas source for subsequent air tightness testing; S6. After the test, open the quick-release rod (3) and remove the centering fixture (1) and the sealing assembly (2).

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