Test fixture, test device and test method for testing circumferential tensile properties of pipe fittings

Abstract

The present invention discloses a test fixture, a test device and a test method for testing the circumferential tensile performance of a pipe fitting. The test fixture includes: a bearing platform, which is adapted to be sealingly fitted at one axial end of the pipe fitting; a limiting member, which includes a limiting pipe portion. The limiting member is adapted to be arranged at the other axial end of the pipe fitting. The limiting pipe portion is located at one end of the limiting member adjacent to the bearing platform and is adapted to be sealingly fitted with the pipe fitting; a sealing member, which is sealingly fitted in the limiting pipe portion and is adapted to jointly define a sealed chamber with the limiting pipe portion, the pipe fitting and the bearing platform. The sealed chamber is adapted to be filled with a test liquid, and the sealing member is adapted to move towards the bearing platform under the pressure of a pressurizing device. According to the test fixture for testing the circumferential tensile performance of a pipe fitting of the present invention, through the cooperation of the bearing platform, the pipe fitting, the limiting pipe portion and the sealing member, mechanical pressure is converted into hydraulic pressure to test the circumferential tensile performance of the pipe fitting. The test equipment is simple, and the test data is accurate and reliable.

Description

Technical Field

[0001] The present invention relates to the field of pipe fitting tests, and particularly to a test fixture, a test device, and a test method for testing the circumferential tensile properties of pipe fittings. Background Art

[0002] A composite winding pipe is a fiber-reinforced plastic pipe manufactured by a winding process, which has the advantages of high circumferential strength and stable product performance, and is commonly used in fields such as petroleum and chemical engineering. The composite winding pipe can be used in combination with concrete to form a confined concrete column, which has the characteristics of high bearing capacity, strong deformation ability, and good durability. In recent years, it has gradually been applied to the field of civil engineering, such as bridge structures, heavy-duty structures, and high-rise structures.

[0003] The circumferential tensile property is an important property of the composite winding pipe. Currently, a test method of filling the pipe with liquid and then pressurizing the liquid until the composite winding pipe is damaged is often used. The loading equipment used in this test method is complex and cannot be used in conjunction with a conventional pressure testing machine; there will be leakage of internal high-pressure liquid during the test process, posing certain safety hazards.

[0004] In addition, there are two failure forms of the composite material, one is fiber failure and the other is interfiber failure; the composite winding pipe for civil engineering usually uses its fiber failure strength, but the existing test methods can only obtain the interfiber failure strength and cannot obtain the fiber failure strength, which cannot meet the requirements of civil engineering application scenarios. Summary of the Invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art.

[0006] To this end, the present invention provides a test fixture for testing the circumferential tensile properties of pipe fittings, with simple test equipment and accurate and reliable test data.

[0007] The present invention also provides a test device for testing the circumferential tensile properties of pipe fittings.

[0008] The present invention also provides a test method for testing the circumferential tensile properties of pipe fittings.

[0009] An experimental fixture for testing the circumferential tensile properties of a pipe fitting according to the first aspect of the present invention, the experimental fixture comprising: a bearing table, the bearing table being adapted to be sealingly fitted to one axial end of the pipe fitting; a limiting member, the limiting member including a limiting pipe portion, the limiting member being adapted to be provided at the other axial end of the pipe fitting, the limiting pipe portion being located at one end of the limiting member adjacent to the bearing table and being adapted to be sealingly fitted to the pipe fitting; a sealing member, the sealing member being sealingly fitted within the limiting pipe portion and being adapted to jointly define a sealed chamber between the limiting pipe portion, the pipe fitting and the bearing table, an experimental liquid being adapted to be filled within the sealed chamber, the sealing member being adapted to move towards the bearing table under the pressure of a pressurizing device.

[0010] The experimental fixture for testing the circumferential tensile properties of a pipe fitting according to the present invention, through the cooperation of the bearing table, the pipe fitting, the limiting pipe portion and the sealing member, defines a sealed chamber, an experimental liquid is filled within the sealed chamber, the pressurizing device pressurizes the sealing member to compress the experimental liquid, converting mechanical pressure into hydraulic pressure for testing the circumferential tensile properties of the pipe fitting, the experimental equipment is simple, and the experimental data is accurate and reliable.

[0011] Further, the experimental device further comprises: a pressure-bearing disc, the pressure-bearing disc being adapted to extend into the limiting pipe portion and abut against the side of the sealing member away from the bearing table, the pressure-bearing disc being used to transmit the pressure of the pressurizing device to the sealing member.

[0012] In some embodiments, the bearing table has a first sealing edge, the first sealing edge being adapted to be sealingly fitted to the pipe fitting through a first sealing ring, the first sealing ring being an H-shaped sealing ring.

[0013] In some embodiments, one end of the limiting pipe portion facing the bearing table has a second sealing edge, the second sealing edge being adapted to be sealingly fitted to the pipe fitting through a second sealing ring, the second sealing ring being an H-shaped sealing ring.

[0014] In some embodiments, the experimental fixture further comprises: an elastic sealing bag, the elastic sealing bag being adapted to be provided within the sealed chamber and being used to contain the experimental liquid.

[0015] Further, the elastic sealing bag is formed into a cylindrical structure and has a sealing opening, the sealing opening being located at one end of the elastic sealing bag adjacent to the bearing table, and the sealing opening is adhesively sealed.

[0016] In some embodiments, the elastic sealing bag is a latex part or a rubber part.

[0017] In some embodiments, the pipe fitting is a composite material wound pipe, and the axial length of the limiting pipe portion is greater than or equal to 20 mm.

[0018] An experimental device for testing the circumferential tensile properties of a pipe fitting according to the second aspect of the present invention, the experimental device comprising: a circumferential tensile property test fixture for the pipe fitting, the circumferential tensile property test fixture for the pipe fitting being the circumferential tensile property test fixture for the pipe fitting as described in the above embodiment; a pressurizing device for applying a pressure along the axial direction of the pipe fitting to the seal to cause the seal to move towards the bearing platform.

[0019] For the experimental device for testing the circumferential tensile properties of a pipe fitting according to the present invention, by adopting the above-mentioned circumferential tensile property test fixture for the pipe fitting, mechanical pressure is converted into hydraulic pressure to test the circumferential tensile properties of the pipe fitting. The experimental equipment is simple, the experimental process is safe and controllable, and the experimental data is accurate and reliable.

[0020] An experimental method for testing the circumferential tensile properties of a pipe fitting according to the third aspect of the present invention, the experimental method being implemented by using the experimental device for testing the circumferential tensile properties of a pipe fitting as described above, and comprising the following steps:

[0021] The pipe fitting is vertically arranged, and the pipe fitting is installed between the bearing platform and the limiting pipe portion;

[0022] Inject test liquid into the pipe fitting, and the liquid level of the test liquid is above the pipe fitting;

[0023] Install the seal into the limiting pipe portion;

[0024] The pressurizing device pressurizes the seal until the pipe fitting is damaged.

[0025] For the experimental method for testing the circumferential tensile properties of a pipe fitting according to the present invention, by using the above-mentioned experimental device for testing the circumferential tensile properties of a pipe fitting, mechanical pressure is converted into hydraulic pressure to test the circumferential tensile properties of the pipe fitting. The experimental equipment is simple, the experimental process is safe and controllable, and the experimental data is accurate and reliable.

[0026] Additional aspects and advantages of the present invention will be given in part in the following description, will become apparent in part from the following description, or will be understood through the practice of the present invention. Description of the Drawings

[0027] The above and / or additional aspects and advantages of the present invention will become apparent and be readily understood from the description of the embodiments in conjunction with the following drawings, wherein:

[0028] Figure 1 It is a schematic structural diagram of a circumferential tensile property test fixture for a pipe fitting according to an embodiment of the present invention;

[0029] Figure 2 It is a cross-sectional view of a circumferential tensile property test fixture for a pipe fitting according to an embodiment of the present invention;

[0030] Figure 3 Structural explosion diagram of a test fixture for testing the circumferential tensile performance of a test pipe fitting according to an embodiment of the present invention;

[0031] Figure 4 Flow schematic diagram of a test method for testing the circumferential tensile performance of a test pipe fitting according to an embodiment of the present invention.

[0032] Reference numerals:

[0033] Test fixture 100,

[0034] Pipe fitting 0,

[0035] Carrying platform 1, first sealing edge 11,

[0036] Position-limiting member 2, position-limiting pipe portion 21, second sealing edge 211,

[0037] Sealing member 3, test liquid 4, pressure-bearing disc 5, first sealing ring 6, second sealing ring 7, elastic sealing bag 8. Detailed implementation manners

[0038] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0039] The following disclosure provides many different embodiments or examples for implementing different structures of the present invention. To simplify the disclosure of the present invention, components and settings of specific examples are described below. Of course, they are only examples and are not intended to limit the present invention. In addition, the present invention may repeat reference numerals and / or letters in different examples. This repetition is for the purpose of simplification and clarity and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides examples of various specific processes and materials, but those of ordinary skill in the art can realize the applicability of other processes and / or the use of other materials.

[0040] The following refers to Figures 1 - 3 , and describes a test fixture 100 for testing the circumferential tensile performance of a test pipe fitting 0 according to an embodiment of the present invention.

[0041] As shown in Figure 1 and Figure 2As shown, a test fixture 100 for testing the circumferential tensile performance of a test pipe fitting 0 according to an embodiment of the present invention, the test fixture 100 includes: a bearing table 1, a limiting member 2, and a sealing member 3. The bearing table 1 is adapted to be sealingly fitted to one axial end of the pipe fitting 0, the limiting member 2 includes a limiting pipe portion 21, the limiting member 2 is adapted to be provided at the other axial end of the pipe fitting 0, the limiting pipe portion 21 is located at one end of the limiting member 2 adjacent to the bearing table 1, and the limiting pipe portion 21 is adapted to be sealingly fitted to the pipe fitting 0. The sealing member 3 is sealingly fitted within the limiting pipe portion 21, and the sealing member 3 is adapted to jointly define a closed chamber with the limiting pipe portion 21, the pipe fitting 0, and the bearing table 1. A test liquid 4 is adapted to be filled within the closed chamber, and the sealing member 3 is adapted to move towards the bearing table 1 under the pressure of a pressurizing device.

[0042] The bearing table 1, the pipe fitting 0, the limiting pipe portion 21, and the sealing member 3 cooperate to jointly define a closed chamber. The pressurizing device can directly or indirectly push the sealing member 3 towards the bearing table 1. The limiting pipe portion 21 can play a good guiding role in the movement of the sealing member 3, facilitating ensuring that the test liquid 4 always bears the load applied along the axial direction of the pipe fitting 0, which is beneficial to improving the accuracy of test data. For example, the pressurizing device can be a conventional pressure testing machine such as a single-column hydraulic press. The pressurizing device 4 compresses the test liquid 4, converts the pressure of the pressurizing device into the hydraulic pressure of the test liquid 4, and the pressure of the test liquid 4 is converted into a circumferential expansion force to achieve the circumferential tensile loading of the pipe fitting 0, thereby testing the circumferential tensile performance of the pipe fitting 0, replacing the traditional water pressure test, solving the contradiction that the traditional water pressure test cannot be used in conjunction with a conventional pressure testing machine, and enabling the use of a traditional pressure testing machine to complete the test.

[0043] It can be understood that the arrangement manner of the pipe fitting 0 can be specifically set according to actual applications. For example, when the pipe fitting 0 is vertically arranged, the bearing table 1 and the limiting member 2 are respectively provided at the upper end and the lower end of the pipe fitting 0. For example, in the Figure 1 and Figure 2 example, the bearing table 1 is sealingly fitted to the lower end of the pipe fitting 0, and the limiting member 2 is provided at the upper end of the pipe fitting 0; when the pipe fitting 0 is horizontally arranged, the bearing table 1 and the limiting member 2 are respectively provided at the two axial ends of the pipe fitting 0; but it is not limited thereto.

[0044] The test fixture 100 for testing the circumferential tensile performance of the test pipe fitting 0 according to an embodiment of the present invention, through the cooperation of the bearing table 1, the pipe fitting 0, the limiting pipe portion 21, and the sealing member 3, defines a closed chamber. The test liquid 4 is filled within the closed chamber. The pressurizing device pressurizes and compresses the test liquid 4 through the sealing member 3, converts the mechanical pressure into hydraulic pressure to test the circumferential tensile performance of the pipe fitting 0. The test equipment is simple, the test data is accurate and reliable, and the test process is convenient to achieve a certain degree of safety and controllability. Thus, when the test fixture 100 tests the circumferential tensile performance of a composite material wound pipe, it is convenient to obtain the fiber failure strength of the composite material, and further can better meet the requirements of the civil engineering field.

[0045] For example, the carrier table 1 and the stopper 2 are preferably machined parts of a precision numerical control machine tool, having high dimensional accuracy and being suitable for mating with the pipe fitting 0. The outer diameter of the seal 3 should be equal to or slightly larger than the inner diameter of the stopper tube portion 21, so that the seal 3 and the stopper tube portion 21 are closely fitted to prevent the test liquid 4 from leaking; for example, the difference between the outer diameter of the seal 3 and the inner diameter of the stopper tube portion 21 may not exceed 1 mm. The seal 3 should also have high shear strength and deformation ability, so as to ensure that the seal 3 does not break prior to the pipe fitting 0 during the test. Of course, the strength of the seal 3 can be determined according to different test pipe fittings 0. For example, when the pipe fitting 0 is a composite material wound pipe, the strength of the seal 3 is not less than 30 MPa. The test liquid 4 should have appropriate viscosity, good viscosity-temperature performance, good oxidation stability performance and good anti-foaming performance, such as engine oil, etc.

[0046] During the test, the carrier table 1 can be fixed on the platform of the pressurizing device; of course, a part of the platform of the pressurizing device can be formed as the carrier table 1.

[0047] According to a further embodiment of the present invention, as Figure 1 and 2 shown, the test fixture 100 for testing the circumferential tensile performance of the pipe fitting 0 further includes: a pressure-bearing disc 5, the pressure-bearing disc 5 is adapted to extend into the stopper tube portion 21, and the pressure-bearing disc 5 abuts against the side of the seal 3 away from the carrier table 1, and the pressure-bearing disc 5 is used to transmit the pressure of the pressurizing device to the seal 3. Specifically, the specifications of the pressurizing device are generally fixed. When testing different pipe fittings 0, when the diameter of the pipe fitting 0 is large and the contact area between the pressure head of the pressurizing device and the seal 3 is small, it is easy to have uneven stress, which affects the test effect. The diameter of the pressure-bearing disc 5 can be slightly smaller than that of the pipe fitting 0, so that there is a large contact area between the pressure-bearing disc 5 and the seal 3. Then the pressure-bearing disc 5 is adapted to transmit the pressure of the pressurizing device to the seal 3 more evenly, so that when the test fixture 100 tests different pipe fittings 0, the same pressurizing device can be used for loading, improving the applicability and versatility of the test fixture 100. Among them, the pressure-bearing disc 5 is preferably a machined part of a precision numerical control machine tool, having high dimensional accuracy.

[0048] According to some embodiments of the present invention, as Figure 2 and Figure 3As shown, the carrier table 1 has a first sealing edge 11, and the first sealing edge 11 is adapted to be sealingly fitted with the pipe fitting 0 through a first sealing ring 6. The first sealing ring 6 is an H-shaped sealing ring. Specifically, the cross-section of the first sealing ring 6 is H-shaped, and the cross-section of the first sealing ring 6 has two notches, and the two notches are respectively in close fit with the first sealing edge 11 and the pipe fitting 0 to achieve the sealing between the carrier table 1 and the pipe fitting 0. Among them, the first sealing ring 6 should have high shear strength and deformation ability, so as to ensure that during the test process, the first sealing ring 6 will not be damaged prior to the pipe fitting 0; the strength of the first sealing ring 6 can be determined according to different test pipe fittings 0. For example, when the pipe fitting 0 is a composite material wound pipe, the strength of the first sealing ring 6 is not less than 30 MPa.

[0049] According to some embodiments of the present invention, as Figure 2 and Figure 3 shown, one end of the limiting pipe portion 21 facing the carrier table 1 has a second sealing edge 211, and the second sealing edge 211 is adapted to be sealingly fitted with the pipe fitting 0 through a second sealing ring 7. The second sealing ring 7 is an H-shaped sealing ring. Specifically, the cross-section of the second sealing ring 7 is H-shaped, and the cross-section of the second sealing ring 7 has two notches, and the two notches are respectively in close fit with the second sealing edge 211 and the pipe fitting 0 to achieve the sealing between the limiting pipe portion 21 and the pipe fitting 0. Among them, the second sealing ring 7 should have high shear strength and deformation ability, so as to ensure that during the test process, the second sealing ring 7 will not be damaged prior to the pipe fitting 0; the strength of the second sealing ring 7 can be determined according to different test pipe fittings 0. For example, when the pipe fitting 0 is a composite material wound pipe, the strength of the second sealing ring 7 is not less than 30 MPa.

[0050] According to some embodiments of the present invention, as Figure 2 shown, the test fixture 100 for testing the circumferential tensile performance of the pipe fitting 0 further includes: an elastic sealing bag 8. The elastic sealing bag 8 is adapted to be arranged in a closed chamber, and the elastic sealing bag 8 is used to contain the test liquid 4. Specifically, the elastic sealing bag 8 has elasticity, and the elastic sealing bag 8 is arranged between the test liquid 4 and the pipe fitting 0, which is convenient for ensuring that the test liquid 4 effectively fills the closed chamber and avoiding dead corners. At the same time, the arrangement of the elastic sealing bag 8 will not affect the hydraulic pressure distribution acting on the pipe fitting 0. During the circumferential tensile performance test of the pipe fitting 0, the pipe fitting 0 may not be able to withstand the hydraulic pressure and be damaged, and at that time, the high-pressure liquid will spray out and cause damage. The elastic sealing bag 8 avoids the above situation because of its elasticity. That is to say, when the pipe fitting 0 is damaged under the action of hydraulic pressure, the test liquid 4 is still completely sealed in the elastic sealing bag 8, avoiding the leakage of the test liquid 4. Thus, by setting the elastic sealing bag 8, the test fixture 100 has good test safety controllability during the test process, improving the safety factor of the test. When the pipe fitting 0 is a composite material wound pipe, it can ensure that the test fixture 100 tests the circumferential tensile performance of the composite material wound pipe, and the fiber failure strength of the composite material wound pipe can be obtained.

[0051] According to a further embodiment of the present invention, the elastic sealing bag 8 is formed into a cylindrical structure, and the elastic sealing bag 8 has a sealing opening which is located at one end of the elastic sealing bag 8 adjacent to the bearing platform 1, and the sealing opening is adhesively sealed. Specifically, the cylindrical elastic sealing bag 8 is easy to cooperate with the pipe fitting 0, which is beneficial to reducing the deformation of the elastic sealing bag 8 and facilitating the placement of the elastic sealing bag 8 filled with the test liquid 4 into the pipe fitting 0. The sealing opening is suitable for being sealed after the test liquid 4 is filled. The sealing opening is close to the bearing platform 1 side, which is beneficial to ensuring the sealing performance of the sealing opening and making the sealing opening not easy to break. Among them, the elastic sealing bag 8 can be a cylindrical structure, which is convenient for further reducing the deformation of the elastic sealing bag 8, but is not limited thereto.

[0052] Optionally, the elastic sealing bag 8 is a cylindrical structure, and the diameter of the cylindrical structure is equal to or slightly smaller than the diameter of the pipe fitting 0, and the difference between the diameter of the pipe fitting 0 and the diameter of the above-mentioned cylindrical structure does not exceed 1 mm.

[0053] According to some embodiments of the present invention, the elastic sealing bag 8 is a latex part or a rubber part. Specifically, both the latex part and the rubber part have good elasticity and are not easy to break; of course, it can be understood that the material of the elastic sealing bag 8 is not limited thereto, such as tetrafluoroethylene, etc.

[0054] Of course, in this application, the elastic sealing bag 8 may not be provided. At this time, the safety of the test personnel can be ensured by the test personnel staying away from the test fixture 100 and setting a protective cover outside the test fixture 100.

[0055] According to some embodiments of the present invention, if the pipe fitting 0 is a composite material wound pipe, then the test fixture 100 in this application can be used to test the circumferential tensile performance of the composite material wound pipe. Among them, the composite material wound pipe can be used in civil engineering. Of course, it can be understood that the material of the pipe fitting 0 is not limited thereto.

[0056] In some embodiments, during the test, strain gauges can be pasted on the outer surface of the pipe fitting 0 to measure the strain change during the test, so as to obtain the circumferential tensile modulus of the pipe fitting 0. For example, when the pipe fitting 0 is a composite material wound pipe, strain gauges can be pasted on the surface of the composite material wound pipe, and by measuring the change of the strain gauges during the test, the circumferential tensile modulus of the composite material wound pipe can be obtained.

[0057] According to some embodiments of the present invention, the axial length of the limiting tube portion 21 is greater than or equal to 20 mm. Specifically, the length of the limiting tube portion 21 is greater than 20 mm, that is, the maximum displacement allowed for the seal 3 is greater than 20 mm, which can avoid the situation that the pipe fitting 0 has not been damaged yet after the displacement stroke of the seal 3 is completed during the test. That is to say, it can avoid the seal 3 moving into the pipe fitting 0 during the test, so that during the whole test process, the seal 3 is always sealed within the limiting tube portion 21.

[0058] The test device for testing the circumferential tensile performance of the pipe fitting 0 according to an embodiment of the present invention includes: a circumferential tensile performance test fixture 100 for the pipe fitting 0 and a pressurizing device. The circumferential tensile performance test fixture 100 for the pipe fitting 0 is the circumferential tensile performance test fixture 100 according to the above embodiment. The pressurizing device is used to apply a pressure along the axial direction of the pipe fitting 0 to the seal 3 so that the seal 3 moves towards the bearing platform 1.

[0059] The test device for testing the circumferential tensile performance of the pipe fitting 0 according to an embodiment of the present invention, by adopting the above circumferential tensile performance test fixture 100 for the pipe fitting 0, converts mechanical pressure into hydraulic pressure to test the circumferential tensile performance of the pipe fitting 0. The test equipment is simple, the test process is safe and controllable, and the test data is accurate and reliable.

[0060] The test method for testing the circumferential tensile performance of the pipe fitting 0 according to an embodiment of the present invention, as Figure 4 shown, the test method is realized by using the above test device for testing the circumferential tensile performance of the pipe fitting 0, and includes the following steps:

[0061] S1, the pipe fitting 0 is arranged vertically, and the pipe fitting 0 is installed between the bearing platform 1 and the limiting tube portion 21, so that the lower end of the pipe fitting 0 can be in sealing fit with the bearing platform 1, and the upper end of the pipe fitting 0 can be in sealing fit with the limiting tube portion 21;

[0062] S2, test liquid 4 is injected into the pipe fitting 0, and the liquid level of the test liquid 4 is above the pipe fitting 0. That is to say, the whole pipe fitting 0 is completely below the liquid level of the test liquid 4, ensuring that during the test process, the whole pipe fitting 0 is under the action of hydraulic pressure;

[0063] S3, the seal 3 is installed into the limiting tube portion 21. At this time, the seal 3, together with the limiting tube portion 21, the pipe fitting 0 and the bearing platform 1, defines a closed chamber, and the test liquid 4 is located in the closed chamber;

[0064] S4, the pressurizing device pressurizes the seal 3 to conduct an axial compression test until the pipe fitting 0 is damaged, and the circumferential expansion load borne by the pipe fitting 0 can be calculated according to the axial pressure load applied by the pressure device.

[0065] According to the test method for the circumferential tensile property of the test pipe fitting 0 according to the embodiments of the present invention, by adopting the above test device for the circumferential tensile property of the test pipe fitting 0, mechanical pressure is converted into hydraulic pressure to test the circumferential tensile property of the pipe fitting 0. The test equipment is simple, the test process is safe and controllable, and the test data is accurate and reliable.

[0066] In some embodiments, as Figure 2 shown, the test fixture 100 further includes a pressure-bearing plate 5. The pressure-bearing plate 5 is adapted to extend into the limiting pipe portion 21, and the pressure-bearing plate 5 abuts against the side of the seal 3 away from the bearing platform 1. The pressure-bearing plate 5 is used to transfer the pressure of the pressurizing device to the seal 3. At this time, the test method further includes placing the pressure-bearing plate 5 in the limiting pipe portion 21 between steps S3 and S4, and making the pressure-bearing plate 5 placed on the upper end of the seal 3 to abut against the upper end of the seal 3.

[0067] In some embodiments, as Figure 2 shown, the test fixture 100 further includes an elastic seal bag 8. The elastic seal bag 8 is arranged in the closed chamber, and the elastic seal bag 8 is used to contain the test liquid 4. At this time, in step S2, after filling the elastic seal bag 8 with the test liquid 4, the elastic seal bag 8 is placed inside the test fixture 100 and the pipe fitting 0. At this time, the liquid level of the test liquid 4 is above the pipe fitting 0.

[0068] For example, in the Figure 2 example, the test fixture 100 includes a bearing platform 1, a limiting member 2, a seal 3, a pressure-bearing plate 5 and an elastic seal bag 8. The bearing platform 1 is hermetically fitted to the lower end of the pipe fitting 0 through a first sealing ring 6. The limiting member 2 includes a limiting pipe portion 21. The limiting pipe portion 21 is formed into a tubular structure. The limiting pipe portion 21 is hermetically fitted to the upper end of the pipe fitting 0 through a second sealing ring 7. The seal 3 is hermetically fitted inside the limiting pipe portion 21, and the seal 3, the limiting pipe portion 21, the pipe fitting 0 and the bearing platform 1 jointly define a closed chamber. The limiting pipe portion 21 is coaxially arranged with the pipe fitting 0. The pressure-bearing plate 5 extends into the limiting pipe portion 21, and the pressure-bearing plate 5 abuts against the side of the seal 3 away from the bearing platform 1. The elastic seal bag 8 is adapted to be arranged in the closed chamber, and the elastic seal bag 8 is used to contain the test liquid 4.

[0069] The test method includes: fixing the carrier table 1 on the platform of the pressurizing device, and installing the first sealing ring 6 on the carrier table 1 to ensure that the first sealing edge 11 of the first sealing ring 6 is in close contact with the carrier table 1 and there are no wrinkles or gaps in the first sealing ring 6; placing the pipe fitting 0 vertically and mating it with the first sealing ring 6 to ensure that the first sealing ring 6 is in close contact with the pipe wall of the pipe fitting 0 and there are no wrinkles or gaps in the first sealing ring 6; installing the second sealing ring 7 at the upper end of the pipe fitting 0 to ensure that the second sealing ring 7 is in close contact with the closing of the pipe fitting 0 and there are no wrinkles or gaps in the second sealing ring 7; installing the limiting member 2 on the second sealing ring 7 such that the limiting pipe portion 21 is in close contact with the second sealing ring 7 and there are no wrinkles or gaps in the second sealing ring 7; placing the elastic sealing bag 8 filled with the test liquid 4 into the pipe fitting 0 from above the limiting member 2 to ensure that the liquid level of the test liquid 4 is above the pipe fitting 0; installing the sealing member 3 into the limiting pipe portion 21 and the sealing member 3 is located above the elastic sealing bag 8 to ensure that the sealing member 3 is in close contact with the limiting pipe portion 21 and there are no wrinkles or gaps in the sealing member 3. At this time, the sealing member 3 can jointly define a closed chamber with the limiting pipe portion 21, the pipe fitting 0 and the carrier table 1; placing the pressure-bearing disc 5 on the upper end of the sealing member 3 from above the limiting member 2; lowering the pressure head of the pressurizing device to an appropriate height, and the pressurizing device pressurizes the sealing member 3 to conduct an axial compression test until the pipe fitting 0 is damaged, and calculating the circumferential expansion load borne by the pipe fitting 0 according to the axial pressure load applied by the pressure device.

[0070] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. In addition, the features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more.

[0071] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0072] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0073] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A test fixture for testing the circumferential tensile performance of a pipe fitting, characterized in that, it includes: a bearing platform, the bearing platform is adapted to be hermetically fitted at one axial end of the pipe fitting, the bearing platform has a first sealing edge, and the first sealing edge is adapted to be hermetically fitted with the pipe fitting through a first sealing ring; a limiting member, the limiting member includes a limiting pipe portion, the limiting member is adapted to be arranged at the other axial end of the pipe fitting, the limiting pipe portion is located at one end of the limiting member adjacent to the bearing platform, and is adapted to be hermetically fitted with the pipe fitting, one end of the limiting pipe portion facing the bearing platform has a second sealing edge, and the second sealing edge is adapted to be hermetically fitted with the pipe fitting through a second sealing ring; a sealing member, the sealing member is hermetically fitted inside the limiting pipe portion, and is adapted to jointly define a sealed chamber with the limiting pipe portion, the pipe fitting and the bearing platform, a test liquid is adapted to be filled in the sealed chamber, and the sealing member is adapted to move towards the bearing platform under the pressure of a pressurizing device; an elastic sealing bag, the elastic sealing bag is adapted to be arranged in the sealed chamber and is used for containing the test liquid, and the liquid level of the test liquid is above the pipe fitting; the strength of the sealing member, the first sealing ring and the second sealing ring is not less than 30 MPa.

2. The test fixture for testing the circumferential tensile performance of a pipe fitting according to claim 1, characterized in that, it further includes: a pressure-bearing disc, the pressure-bearing disc is adapted to extend into the limiting pipe portion and abut against the side of the sealing member away from the bearing platform, and the pressure-bearing disc is used for transmitting the pressure of the pressurizing device to the sealing member.

3. The test fixture for testing the circumferential tensile performance of a pipe fitting according to claim 1, characterized in that, the first sealing ring is an H-shaped sealing ring.

4. The test fixture for testing the circumferential tensile performance of a pipe fitting according to claim 1, characterized in that, the second sealing ring is an H-shaped sealing ring.

5. The test fixture for testing the circumferential tensile performance of a pipe fitting according to claim 1, characterized in that, the elastic sealing bag is formed into a cylindrical structure and has a sealing opening, the sealing opening is located at one end of the elastic sealing bag adjacent to the bearing platform, and the sealing opening is adhesively sealed.

6. The test fixture for testing the circumferential tensile performance of a pipe fitting according to claim 1, characterized in that, the elastic sealing bag is a latex part or a rubber part.

7. The test fixture for testing the circumferential tensile performance of a pipe fitting according to claim 1, characterized in that, the pipe fitting is a composite material wound pipe, and the axial length of the limiting pipe portion is greater than or equal to 20 mm.

8. A test device for testing the circumferential tensile performance of a pipe fitting, characterized in that, it includes: a test fixture for testing the circumferential tensile performance of a pipe fitting, the test fixture for testing the circumferential tensile performance of a pipe fitting is the test fixture for testing the circumferential tensile performance of a pipe fitting according to any one of claims 1-7; a pressurizing device, the pressurizing device is used for applying a pressure along the axial direction of the pipe fitting to the sealing member so that the sealing member moves towards the bearing platform.

9. A test method for testing the circumferential tensile performance of a pipe fitting, characterized in that, The test method is implemented by using the test device for testing the circumferential tensile performance of the pipe fittings according to claim 8, and comprises the following steps: The pipe fitting is arranged vertically, and the pipe fitting is installed between the bearing table and the limiting pipe part; Inject test liquid into the pipe fitting, and the liquid level of the test liquid is above the pipe fitting; Install the seal into the limiting pipe part; The pressurizing device pressurizes the seal until the pipe fitting is damaged.

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