Torsional fatigue test device for welding seam of sealing layer of gas storage

Abstract

The invention provides a gas storage sealing layer weld torsional fatigue test device, and belongs to the technical field of gas storage sealing layer design devices. The device comprises a first clamping jaw, a second clamping jaw and a rotary power output shaft, one end of a to-be-tested welding assembly can be held by the first clamping jaw, and the other end of the to-be-tested welding assembly can be held by the second clamping jaw. The output end of the rotating power output shaft is fixedly connected to the first clamping jaw, so that when rotating power is output through the rotating power output shaft, the to-be-tested welding assembly can be subjected to corresponding torsion acting force along with the first clamping jaw. A to-be-tested welding assembly is held through the first clamping jaw and the second clamping jaw, rotating power is output through the rotating power output shaft, so that torsion acting force is applied to the to-be-tested welding assembly, a torsion fatigue test is conducted on the to-be-tested welding assembly, and an accurate gas storage sealing layer welding seam torsion fatigue test conclusion can be obtained; and technical support is provided for fatigue life evaluation and structure optimization of the gas storage sealing layer welding seam.

Description

Technical Field

[0001] This invention relates to the technical field of gas storage sealing layer design devices, and in particular to a torsional fatigue testing device for the weld seam of a gas storage sealing layer. Background Technology

[0002] In compressed air energy storage systems, underground gas storage facilities are the core thermal and gas storage units, and their sealing performance directly determines the system's operational efficiency and safety stability. To meet the demands of high-pressure gas storage, the sealing layer of gas storage facilities often adopts a welded steel plate structure. The weld seam, as the weakest point of the sealing layer, must withstand the torsional stress generated by the pressure alternation during repeated filling and emptying of the gas storage facility. During filling, the gas pressure pushes the steel plate to deform, and the weld seam is subjected to positive torsional force; during emptying, the pressure drops sharply, and the weld seam rebounds with the steel plate, bearing the reverse torsional force. Long-term alternating loads can easily lead to fatigue cracks in the weld seam, causing risks such as sealing failure and gas leakage.

[0003] The weld quality of the sealing layer of a gas storage facility directly affects its sealing performance and service life. Especially under long-term alternating torsional stress, the weld is prone to fatigue damage. Currently, there are many fatigue testing devices for ordinary welds, but there is a lack of devices specifically designed for testing the torsional fatigue characteristics of gas storage facility sealing layer welds. These devices cannot accurately simulate the actual stress conditions of the sealing layer welds, and existing similar devices suffer from inaccurate simulation, poor specimen adaptability, incomplete data acquisition, and low flexibility in load adjustment, making it difficult to meet the needs of fatigue performance evaluation.

[0004] Therefore, there is an urgent need to design a weld torsional fatigue testing device that can accurately simulate the actual working conditions of gas storage facilities, adapt to specimens of multiple sizes, collect comprehensive data, and be flexible in adjustment, so as to provide technical support for fatigue life assessment and structural optimization of the sealing layer welds of gas storage facilities. Summary of the Invention

[0005] In view of this, the present invention provides a torsional fatigue testing device for the sealing layer weld of a gas storage facility. This device can hold the welded component to be tested using a first and second jaw, and output rotational power through a rotational power output shaft to apply torsional force to the welded component. A torsional fatigue test is then performed on the welded component, ultimately obtaining accurate torsional fatigue test results for the sealing layer weld of the gas storage facility. This provides technical support for fatigue life assessment and structural optimization of the sealing layer weld of the gas storage facility, making it more suitable for practical application.

[0006] To achieve the first objective mentioned above, the technical solution of the torsional fatigue testing device for the sealing layer weld of a gas storage facility provided by the present invention is as follows: The torsional fatigue testing device for the sealing layer weld of the gas storage tank provided by the present invention includes a first jaw (15a), a second jaw (15b) and a rotary power output shaft (10). One end of the component to be welded can be held by the first jaw (15a), and the other end of the component to be welded can be held by the second jaw (15b). The output end of the rotary power output shaft (10) is fixedly connected to the first jaw (15a), so that when the rotary power output shaft (10) outputs rotary power, the welding component to be tested can be subjected to the corresponding torsional force along with the first jaw (15a).

[0007] The torsional fatigue testing device for the sealing layer weld of the gas storage tank provided by the present invention can also be further implemented by the following technical measures.

[0008] Preferably, the gas storage sealing layer weld torsional fatigue test device further includes a first clamping arm (9a), a first clamp (11a), a first connecting rod (12), a first ball head (13), a first ball seat (14), and a first positioning component (16). The first claw (15a) is fixedly connected to the first clamping arm (9a), and a first accommodating space is provided at the axial center of the first clamping arm (9a). At least one first positioning groove (17) is provided on the circumferential top edge of the first clamping arm (9a). The first connecting rod (12) is a first stepped shaft. The diameter of the first section of the first stepped shaft is larger than the diameter of the second section of the first stepped shaft. The first ball head (13) passes through the second section of the shaft, and the first ball seat (14) passes through the second section of the shaft, so that the spherical part of the first ball seat (14) corresponds to the first ball seat (14). The first connecting rod (12) is fixedly connected to the first pawl (15a) through the second section of the shaft. The first positioning member (16) is fixedly connected to the circumferential bottom edge of the first clamp (11a), and a second accommodating space is provided at the axial center of the first clamp (11a). After the first clamping arm (9a) and the first clamp (11a) are engaged through the first positioning member (16a) and the first positioning groove (17), the first accommodating space and the second accommodating space are connected to form a first through accommodating space. The first connecting rod (12) is disposed in the first through-accommodating space, and the first section of the shaft of the first connecting rod (12) is fixedly connected to the rotary power output shaft (10).

[0009] Preferably, the gas storage tank sealing layer weld torsional fatigue testing device further includes a second clamping arm (9b), a second clamp (11b), a second connecting rod, a second ball head, a second ball seat, and a second positioning component. The second jaw (15b) is fixedly connected to the second clamping arm (9b), and a third accommodating space is provided at the axial center of the second clamping arm (9b). At least one second positioning groove is provided on the circumferential bottom edge of the second clamping arm (9b). The second connecting rod is a second stepped shaft. The diameter of the third section of the second stepped shaft is larger than the diameter of the fourth section of the second stepped shaft. The second ball head passes through the fourth section of the shaft, and the second ball seat passes through the fourth section of the shaft, so that the spherical part of the second ball seat corresponds to the second ball seat. The second connecting rod is fixedly connected to the second pawl (15b) through the fourth section of the shaft. The second positioning member is fixedly connected to the circumferential bottom edge of the second clamp (11b), and a fourth accommodating space is provided at the axial center of the second clamp (11b). After the second clamping arm (9b) and the second clamp (11b) are engaged through the second positioning member and the second positioning groove, the third accommodating space and the fourth accommodating space are connected to form a second through accommodating space. The second connecting rod is disposed within the second through-access space, and the third segment of the second connecting rod is fixed.

[0010] Preferably, the gas storage tank sealing layer weld torsional fatigue test device also includes a test platform (1). The second clamp (11b) is fixedly connected to the test platform (1), and the third section shaft of the second connecting rod is fixedly connected to the second clamp (11b), so that the third section shaft of the second connecting rod is fixed.

[0011] Preferably, the gas storage tank sealing layer weld torsional fatigue test device further includes an axial loading wheel (6). The axial loading wheel (6) is positioned above the first clamp (11a), such that the axial loading wheel (6) and the rotary power output shaft (10) form a threaded pair. By rotating the axial loading wheel (6), an axial loading force can be applied to the welding assembly under test.

[0012] Preferably, the gas storage tank sealing layer weld torsional fatigue test device further includes an axial loading plate (7). The axial loading plate (7) has a first through hole at its center, such that the inner diameter of the axial loading plate (7) is larger than the diameter of the first clamp (11a), and the outer diameter of the axial loading plate (7) is larger than the diameter of the first clamp (11a). The axial loading plate (7) is disposed between the first clamp (11a) and the axial loading wheel (6).

[0013] Preferably, the gas storage tank sealing layer weld torsional fatigue test device also includes an axial load sensor (8). The axial load sensor (8) has a second through hole at its center, such that the inner diameter of the axial loading plate (7) is larger than the diameter of the first clamp (11a), and the outer diameter of the axial load sensor (8) is larger than the diameter of the first clamp (11a). The axial load sensor (8) is disposed between the axial loading plate (7) and the first clamp (11a).

[0014] Preferably, the rotating power driving element is an electric motor (2).

[0015] Preferably, the gas storage tank sealing layer weld torsional fatigue test device further includes a coupling (3), a first drive shaft (4a), a second drive shaft (4b), a first commutator (5a), and a second commutator (5b). The output shaft of the motor (2) is connected to the first transmission shaft (4a) via the coupling (3), the first transmission shaft (4a) is connected to the second transmission shaft (4b) via the first commutator (5a), and the second transmission shaft (4b) is connected to the rotating power prime mover (10) via the second commutator (5b).

[0016] Preferably, the gas storage tank sealing layer weld torsional fatigue test device also includes a test platform (1). The motor (2) is mounted on the test platform (1).

[0017] The torsional fatigue testing device for the sealing layer weld of the gas storage facility provided by this invention can hold the welded component to be tested through the first jaw (15a) and the second jaw (15b), and output rotational power through the rotational power output shaft to apply torsional force to the welded component to be tested, thereby conducting a torsional fatigue test on the welded component to be tested, and finally obtaining accurate torsional fatigue test conclusions for the sealing layer weld of the gas storage facility, providing technical support for fatigue life assessment and structural optimization of the sealing layer weld of the gas storage facility. Attached Figure Description

[0018] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings: Appendix Figure 1 A schematic diagram of the overall structure of the weld torsional fatigue test device provided in an embodiment of the present invention; Appendix Figure 2An exploded view of each component in the first torsion mechanism used in the weld torsion fatigue testing device provided in an embodiment of the present invention; Explanation of reference numerals in the attached figures: 1-Test platform, 2-Motor, 3-Coupling, 4a-First drive shaft, 4b-Second drive shaft, 5a-First commutator, 5b-Second commutator, 6-Axial loading wheel, 7-Axial loading plate, 8-Axial load sensor, 9a-First clamping arm, 9b-Second clamping arm, 10-Rotary power output shaft, 11a-First clamp, 11b-Second clamp, 12-First connecting rod, 13-First ball head, 14-First ball seat, 15a-First chuck, 15b-Second chuck, 16-First positioning component, 17-First positioning groove. Detailed Implementation

[0019] In view of this, the present invention provides a torsional fatigue testing device for the sealing layer weld of a gas storage facility. This device can hold the welded component to be tested using a first and second jaw, and output rotational power through a rotational power output shaft to apply torsional force to the welded component. A torsional fatigue test is then performed on the welded component, ultimately obtaining accurate torsional fatigue test results for the sealing layer weld of the gas storage facility. This provides technical support for fatigue life assessment and structural optimization of the sealing layer weld of the gas storage facility, making it more suitable for practical application.

[0020] To further illustrate the technical means and effects adopted by the present invention to achieve the intended purpose, the following, in conjunction with the accompanying drawings and preferred embodiments, details the specific implementation, structure, features, and effects of a torsional fatigue testing device for the sealing layer weld of a gas storage tank according to the present invention. In the following description, different "embodiments" or "embodiments" do not necessarily refer to the same embodiment. Furthermore, specific features, structures, or characteristics in one or more embodiments can be combined in any suitable form.

[0021] In this article, the term "and / or" is merely a description of the relationship between related objects, indicating that there can be three relationships, such as A and / or B. Specifically, it can mean that A and B can be included at the same time, A can exist alone, or B can exist alone, and any of the above three situations can be met.

[0022] See appendix Figure 1 and attached Figure 2The torsional fatigue testing device for the sealing layer weld of a gas storage facility provided in this embodiment of the invention includes a first jaw 15a, a second jaw 15b, and a rotary power output shaft 10. One end of the welded component to be tested can be held by the first jaw 15a, and the other end of the welded component to be tested can be held by the second jaw 15b. The output end of the rotary power output shaft 10 is fixedly connected to the first jaw 15a, so that when the rotary power output shaft 10 outputs rotational power, the welded component to be tested can be subjected to a corresponding torsional force along with the first jaw 15a.

[0023] The torsional fatigue testing device for the sealing layer weld of a gas storage facility provided in this embodiment of the invention can hold the welded component to be tested through the first jaw 15a and the second jaw 15b, and output rotational power through the rotational power output shaft, thereby applying torsional force to the welded component to be tested, performing a torsional fatigue test on the welded component to be tested, and finally obtaining accurate torsional fatigue test conclusions for the sealing layer weld of the gas storage facility, providing technical support for fatigue life assessment and structural optimization of the sealing layer weld of the gas storage facility.

[0024] The torsional fatigue testing device for the sealing layer weld of the gas storage tank provided in this embodiment of the invention further includes a first clamping arm 9a, a first clamp 11a, a first connecting rod 12, a first ball head 13, a first ball seat 14, and a first positioning element 16. A first jaw 15a is fixedly connected to the first clamping arm 9a, and a first accommodating space is provided at the axial center of the first clamping arm 9a. At least one first positioning groove 17 is provided on the circumferential top edge of the first clamping arm 9a. The first connecting rod 12 is a first stepped shaft, the diameter of the first segment of the first stepped shaft is larger than the diameter of the second segment of the first stepped shaft, the first ball head 13 passes through the second segment of the shaft, and the first ball seat 14 passes through the second segment of the shaft, such that the spherical portion of the first ball seat 14 corresponds to the first ball seat 14. The first connecting rod 12 is fixedly connected to the first jaw 15a through the second segment of the shaft. The first positioning element 16 is fixedly connected to the circumferential bottom edge of the first clamp 11a, and a second accommodating space is provided at the axial center of the first clamp 11a. After the first clamping arm 9a and the first clamp 11a are engaged through the first positioning member 16a and the first positioning groove 17, the first accommodating space and the second accommodating space are connected to form a first through accommodating space. The first connecting rod 12 is disposed in the first through accommodating space, and the first section of the shaft of the first connecting rod 12 is fixedly connected to the rotary power output shaft 10. In this case, through the contact between the spherical part of the first ball head 13 and the first ball seat 14, and utilizing the isotropic property of the spherical part of the first ball head 13, even if the first connecting rod 12 is slightly deflected, the contact between the spherical part of the first ball head 13 and the first ball seat 14 can be used to avoid the force applied when applying torsional force to the welded component under test being deflected. This makes the test conclusions of the torsional fatigue test of the gas storage sealing layer weld seam provided by the gas storage sealing layer weld seam torsional fatigue test device of the present invention more accurate and minimizes data contamination.

[0025] The torsional fatigue testing device for the sealing layer weld of the gas storage tank provided in this embodiment of the invention further includes a second clamping arm 9b, a second clamp 11b, a second connecting rod, a second ball head, a second ball seat, and a second positioning element. The second jaw 15b is fixedly connected to the second clamping arm 9b, and a third accommodating space is provided at the axial center of the second clamping arm 9b. At least one second positioning groove is provided on the circumferential bottom edge of the second clamping arm 9b. The second connecting rod is a second stepped shaft, the diameter of the third segment of the second stepped shaft is larger than the diameter of the fourth segment of the second stepped shaft, the second ball head passes through the fourth segment of the shaft, and the second ball seat passes through the fourth segment of the shaft, such that the spherical portion of the second ball seat corresponds to the second ball seat. The second connecting rod is fixedly connected to the second jaw 15b through the fourth segment of the shaft. The second positioning element is fixedly connected to the circumferential bottom edge of the second clamp 11b, and a fourth accommodating space is provided at the axial center of the second clamp 11b. After the second clamping arm 9b and the second clamp 11b are engaged through the second positioning member and the second positioning groove, the third accommodating space and the fourth accommodating space are connected to form a second through accommodating space. The second connecting rod is disposed in the second through accommodating space, and the third segment shaft of the second connecting rod is fixed. In this case, by utilizing the isotropic property of the spherical part of the second ball head and the second ball seat through the contact between the spherical part of the second ball head and the second ball seat, even if the second connecting rod is slightly deflected, the force applied when applying torsional force to the welded component under test can be prevented from being deflected. This makes the test conclusions of the torsional fatigue test of the gas storage sealing layer weld seam provided by the gas storage sealing layer weld seam torsional fatigue test device of the present invention more accurate and minimizes data contamination.

[0026] The torsional fatigue testing device for the sealing layer weld of the gas storage tank provided in this embodiment of the invention also includes a test platform 1. A second clamp 11b is fixedly connected to the test platform 1, and the third segment shaft of the second connecting rod is fixedly connected to the second clamp 11b, thus fixing the third segment shaft of the second connecting rod. In this configuration, the fixing of the second clamp 11b is more secure.

[0027] The torsional fatigue testing device for the sealing layer weld of the gas storage facility provided in this embodiment of the invention further includes an axial loading wheel 6. The axial loading wheel 6 is positioned above the first clamp 11a, forming a threaded pair with the rotary power output shaft 10. By rotating the axial loading wheel 6, an axial loading force can be applied to the welded assembly under test. In this case, using the torsional fatigue testing device for the sealing layer weld of the gas storage facility provided in this embodiment of the invention, an axial force can be applied to the welded assembly under test during the torsional fatigue test, thereby obtaining the torsional fatigue test conclusion of the weld under test when the welded assembly is subjected to an axial force.

[0028] The torsional fatigue testing device for the sealing layer weld of the gas storage tank provided in this embodiment of the invention further includes an axial loading plate 7. A first through hole is formed at the center of the axial loading plate 7, such that the inner diameter of the axial loading plate 7 is larger than the diameter of the first clamp 11a, and the outer diameter of the axial loading plate 7 is larger than the diameter of the first clamp 11a. The axial loading plate 7 is positioned between the first clamp 11a and the axial loading wheel 6. In this configuration, the axial loading plate 7 enlarges the contact area between the axial loading wheel 6 and the first clamp 11a, resulting in a more balanced force application when force is applied to the welded component under test.

[0029] The torsional fatigue testing device for the sealing layer weld of the gas storage tank provided in this embodiment of the invention further includes an axial load sensor 8. A second through hole is provided at the center of the axial load sensor 8, such that the inner diameter of the axial loading plate 7 is larger than the diameter of the first clamp 11a, and the outer diameter of the axial load sensor 8 is larger than the diameter of the first clamp 11a. The axial load sensor 8 is disposed between the axial loading plate 7 and the first clamp 11a. In this configuration, a quantitative value of the axial load can be obtained through the axial load sensor 8 during the torsional fatigue testing of the sealing layer weld of the gas storage tank provided in this embodiment of the invention.

[0030] The rotating power driving element is motor 2. In this case, applying a torsional force to the welded component under test by motor 2 makes the testing process more labor-saving. In this embodiment, the output shaft of motor 2 can rotate in both forward and reverse directions, thereby applying a forward and reverse cyclic torsional force to the welded component under test, and thus using the gas storage sealing layer weld torsional fatigue testing device provided in this embodiment of the invention to perform a weld torsional fatigue test on the welded component under test.

[0031] The torsional fatigue testing device for the sealing layer weld of the gas storage tank provided in this embodiment of the invention further includes a coupling 3, a first drive shaft 4a, a second drive shaft 4b, a first commutator 5a, and a second commutator 5b. The output shaft of the motor 2 is connected to the first drive shaft 4a via the coupling 3, the first drive shaft 4a is connected to the second drive shaft 4b via the first commutator 5a, and the second drive shaft 4b is connected to the rotating power prime mover 10 via the second commutator 5b. In this case, the coupling 3, the first drive shaft 4a, the second drive shaft 4b, the first commutator 5a, and the second commutator 5b allow for a richer and more diverse range of forces applied to the welded component under test, resulting in richer and more diverse test conclusions. Therefore, when providing technical support for the fatigue life assessment and structural optimization of the sealing layer weld of the gas storage tank, the data is richer and more diverse.

[0032] The torsional fatigue testing device for the sealing layer weld of the gas storage tank provided in this embodiment also includes a test platform 1. A motor 2 is mounted on the test platform 1. This configuration enhances the integrated performance of the torsional fatigue testing device for the sealing layer weld of the gas storage tank provided in this embodiment. In this embodiment, a shock-absorbing buffer pad is provided on the test platform 1, thus providing shock absorption during the operation of the motor 2.

[0033] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the invention.

[0034] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A torsional fatigue testing device for the weld seam of a gas storage tank sealing layer, characterized in that, It includes a first chuck (15a), a second chuck (15b), and a rotary power output shaft (10). One end of the component to be welded can be held by the first jaw (15a), and the other end of the component to be welded can be held by the second jaw (15b). The output end of the rotary power output shaft (10) is fixedly connected to the first jaw (15a), so that when the rotary power output shaft (10) outputs rotary power, the welding component to be tested can be subjected to the corresponding torsional force along with the first jaw (15a).

2. The torsional fatigue testing device for the sealing layer weld of a gas storage tank according to claim 1, characterized in that, It also includes a first clamping arm (9a), a first clamp (11a), a first connecting rod (12), a first ball head (13), a first ball seat (14), and a first positioning component (16). The first claw (15a) is fixedly connected to the first clamping arm (9a), and a first accommodating space is provided at the axial center of the first clamping arm (9a). At least one first positioning groove (17) is provided on the circumferential top edge of the first clamping arm (9a). The first connecting rod (12) is a first stepped shaft. The diameter of the first section of the first stepped shaft is larger than the diameter of the second section of the first stepped shaft. The first ball head (13) passes through the second section of the shaft, and the first ball seat (14) passes through the second section of the shaft, so that the spherical part of the first ball seat (14) corresponds to the first ball seat (14). The first connecting rod (12) is fixedly connected to the first pawl (15a) through the second section of the shaft. The first positioning member (16) is fixedly connected to the circumferential bottom edge of the first clamp (11a), and a second accommodating space is provided at the axial center of the first clamp (11a). After the first clamping arm (9a) and the first clamp (11a) are engaged through the first positioning member (16a) and the first positioning groove (17), the first accommodating space and the second accommodating space are connected to form a first through accommodating space. The first connecting rod (12) is disposed in the first through-accommodating space, and the first section of the shaft of the first connecting rod (12) is fixedly connected to the rotary power output shaft (10).

3. The torsional fatigue testing device for the sealing layer weld of a gas storage tank according to claim 1, characterized in that, It also includes a second clamping arm (9b), a second clamp (11b), a second connecting rod, a second ball head, a second ball seat, and a second positioning component. The second jaw (15b) is fixedly connected to the second clamping arm (9b), and a third accommodating space is provided at the axial center of the second clamping arm (9b). At least one second positioning groove is provided on the circumferential bottom edge of the second clamping arm (9b). The second connecting rod is a second stepped shaft. The diameter of the third section of the second stepped shaft is larger than the diameter of the fourth section of the second stepped shaft. The second ball head passes through the fourth section of the shaft, and the second ball seat passes through the fourth section of the shaft, so that the spherical part of the second ball seat corresponds to the second ball seat. The second connecting rod is fixedly connected to the second pawl (15b) through the fourth section of the shaft. The second positioning member is fixedly connected to the circumferential bottom edge of the second clamp (11b), and a fourth accommodating space is provided at the axial center of the second clamp (11b). After the second clamping arm (9b) and the second clamp (11b) are engaged through the second positioning member and the second positioning groove, the third accommodating space and the fourth accommodating space are connected to form a second through accommodating space. The second link is disposed within the second through-cavity space, and the third segment of the second link is fixed.

4. The torsional fatigue testing device for the sealing layer weld of a gas storage tank according to claim 3, characterized in that, It also includes an experimental platform (1). The second clamp (11b) is fixedly connected to the test platform (1), and the third section shaft of the second connecting rod is fixedly connected to the second clamp (11b), so that the third section shaft of the second connecting rod is fixed.

5. The torsional fatigue testing device for the sealing layer weld of a gas storage tank according to claim 2, characterized in that, It also includes an axial loading wheel (6). The axial loading wheel (6) is positioned above the first clamp (11a), such that the axial loading wheel (6) and the rotary power output shaft (10) form a threaded pair. By rotating the axial loading wheel (6), an axial loading force can be applied to the welding assembly under test.

6. The torsional fatigue testing device for the sealing layer weld of a gas storage tank according to claim 5, characterized in that, It also includes an axial loading plate (7). The axial loading plate (7) has a first through hole at its center, such that the inner diameter of the axial loading plate (7) is larger than the diameter of the first clamp (11a), and the outer diameter of the axial loading plate (7) is larger than the diameter of the first clamp (11a). The axial loading plate (7) is disposed between the first clamp (11a) and the axial loading wheel (6).

7. The torsional fatigue testing device for the sealing layer weld of a gas storage tank according to claim 6, characterized in that, It also includes an axial load sensor (8). The axial load sensor (8) has a second through hole at its center, such that the inner diameter of the axial loading plate (7) is larger than the diameter of the first clamp (11a), and the outer diameter of the axial load sensor (8) is larger than the diameter of the first clamp (11a). The axial load sensor (8) is disposed between the axial loading plate (7) and the first clamp (11a).

8. The torsional fatigue testing device for the sealing layer weld of a gas storage tank according to claim 1, characterized in that, The rotating power driving element is a motor (2).

9. The torsional fatigue testing device for the sealing layer weld of a gas storage tank according to claim 8, characterized in that, It also includes a coupling (3), a first drive shaft (4a), a second drive shaft (4b), a first commutator (5a), and a second commutator (5b). The output shaft of the motor (2) is connected to the first transmission shaft (4a) via the coupling (3), the first transmission shaft (4a) is connected to the second transmission shaft (4b) via the first commutator (5a), and the second transmission shaft (4b) is connected to the rotating power prime mover (10) via the second commutator (5b).

10. The torsional fatigue testing device for the sealing layer weld of a gas storage tank according to claim 9, characterized in that, It also includes an experimental platform (1). The motor (2) is mounted on the test platform (1).

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