Mobile assembly and disassembly type high-temperature and high-pressure hydrogen environment in-situ tensile test device and method

Abstract

The invention provides a mobile assembly and disassembly type high-temperature and high-pressure hydrogen environment in-situ tensile test device and method, the device is suitable for a universal testing machine, and the device comprises a mobile base frame, a power supporting assembly and an assembly and disassembly type tensile kettle. The base frame is provided with a gravity balance plate and a guide rail, and the supporting frame sliding block slides on the guide rail and is convenient to move. The power supporting assembly comprises a hollow supporting stand column, a lifting sleeve, a mounting arm and a lifting supporting plate, and lifting and rotating of the stretching kettle are achieved. The stretching kettle is composed of a kettle body, a kettle cover and a stretching shaft and can fix a stretching sample, and high-pressure hydrogen is prevented from leaking in a combined sealing mode. The method comprises the steps of sample installation, gas inflation and deflation, heating, alignment, tensile test, data storage, cooling disassembly and the like. The problems that a traditional device is poor in flexibility, limited in performance, inaccurate in strain measurement and the like are solved, the testing efficiency and applicability are improved, and the long-term mechanical behavior of the metal sealing layer in the high-pressure and high-temperature hydrogen environment can be explored easily.

Description

Technical Field

[0001] The invention relates to the technical field of material mechanical property testing, and in particular to a mobile detachable high-temperature and high-pressure hydrogen environment in-situ tensile testing device and method, which is applicable to a universal testing machine. Background Art

[0002] New energy sources such as solar energy and wind energy have attracted much attention due to their abundant resources, cleanness and environmental protection. However, the stability of power generation of these energy sources has always been a key factor restricting their development. Therefore, a reasonable energy storage method is crucial to ensure the stable operation of the power grid. Underground hydrogen storage, especially the use of large lined rock caverns (LRC) high-pressure gas storage, has become one of the main solutions to the stability problem of new energy power generation due to its strong adaptability and ability to withstand high gas pressure. In coastal areas, the use of abundant clean energy and the flexible establishment of large lined rock cavern underground hydrogen storage systems are of great significance for achieving a comprehensive technological breakthrough in hydrogen energy from storage to utilization.

[0003] Hydrogen energy, as an abundant, green, low-carbon and widely used secondary energy source, is an important supplement to the modern energy system. However, the main challenge facing large-scale and long-term underground hydrogen storage is the effective storage of hydrogen. During the operation of hydrogen storage tanks or pipeline transportation, metal materials are in direct contact with high-pressure hydrogen, which can easily cause metal hydrogen embrittlement and significantly reduce the durability of the materials. Therefore, research on the storage of gases such as hydrogen in lined caverns is receiving widespread attention, and there is an urgent need to develop an in-situ, high-temperature, high-pressure hydrogen environment mechanical testing equipment to fully explore the long-term mechanical behavior of the metal sealing layer.

[0004] Traditional testing equipment usually uses an integrated hydrogen environment chamber and testing machine combination, which lacks flexibility and cannot be disassembled, limiting its applicability on different testing machines; there is a gap in the performance of the integrated device and the performance of the selected testing machine is usually low and cannot meet high-standard testing requirements; in the strain measurement of the specimen in the kettle, traditional methods mostly use contact strain measurement, which cannot accurately obtain material deformation data due to environmental factors. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the above technical defects and provide a mobile and detachable high-temperature and high-pressure hydrogen environment in-situ tensile test device and method. The device has high flexibility and accuracy, can perform mechanical tests on metal materials in an in-situ, high-temperature, high-pressure hydrogen environment, and perform more precise strain measurements on test pieces in a kettle.

[0006] In order to solve the above technical problems, the technical solution provided by the present invention is: a mobile and detachable high temperature and high pressure hydrogen environment in-situ tensile testing device, comprising:

[0007] A mobile base frame, comprising a gravity balance plate and a basic support frame, wherein a guide rail is provided above the gravity balance plate along the length direction and the basic support frame slides on the guide rail through a slider at the bottom, and rolling wheels are also provided on both sides of the gravity balance plate;

[0008] A power support assembly, comprising a hollow support column, a first force arm lifting support plate and a second force arm lifting support plate, wherein the hollow support column is provided with a first lifting sleeve and a second lifting sleeve capable of lifting and lowering, the first lifting sleeve and the second lifting sleeve are respectively provided with a first mounting arm and a second mounting arm capable of rotating, and the first force arm lifting support plate and the second force arm lifting support plate are respectively installed at the front ends of the first mounting arm and the second mounting arm;

[0009] A detachable stretching kettle comprises a stretching kettle body, a stretching kettle cover and a stretching shaft. The stretching kettle body is fixed to a second lever arm lifting support plate by bolts. The stretching kettle cover is buckled on the stretching kettle body and fastened by circumferentially distributed bolts. The bottom of the first lever arm lifting support plate is also provided with a connecting screw threadedly connected to the stretching kettle cover. A stretching specimen is installed inside the stretching kettle body through a specimen fixing bracket. The stretching shaft is installed above the stretching kettle cover and the bottom end of the stretching shaft is connected to the stretching specimen in the stretching kettle body.

[0010] Preferably, the outer side of the stretching kettle body is wrapped with a heater, and the stretching kettle cover is also provided with air inlets and outlets, a thermocouple mounting port and a pressure sensor. The stretching shaft and the stretching kettle cover are dynamically sealed by a combination of sealing forms such as O-rings, flexible graphite, and spring energy storage, and the outside of the stretching shaft is also wrapped with a water cooling jacket.

[0011] Preferably, a servo motor is provided at the upper end of the hollow support column, and the output shaft of the servo motor is provided with a ball screw located inside the hollow support column. Guide holes are also provided on both sides of the outer wall of the hollow support column. The first lifting sleeve is slidably arranged in the guide hole and is threadedly sleeved on the ball screw through a screw nut.

[0012] Preferably, a servo electric cylinder is further provided on the side of the bottom end of the basic support frame, and the output end of the servo electric cylinder extends into the interior of the hollow support column and is connected to the second lifting sleeve.

[0013] Preferably, an observation window is also provided on one side of the stretching kettle body, and the observation window comprises a hollow steel body seamlessly welded to the side wall of the stretching kettle body, and a window glass mounting tube is installed at one end of the hollow steel body away from the stretching kettle body through bolts, and a mounting groove is provided at one end of the window glass mounting tube away from the hollow steel body, and a window glass is clamped in the mounting groove, and a clamping nut for clamping the window glass is also threadedly connected to the outside of the mounting groove.

[0014] Preferably, a high-performance plastic gasket layer located at the front end of the window glass and an O-ring located at the rear end of the window glass are further provided in the installation notch of the window glass installation tube.

[0015] Preferably, the basic support frame is provided with a left-right rotating reaction frame located on one side of the hollow supporting column, and the left-right rotating reaction frame is provided with an opening for the second lever arm to lift the support plate through, and extension plates are respectively provided on both sides of the front end of the opening, and limiting bolts are threadedly connected on both sides of the extension plates.

[0016] Preferably, the gravity balance plate is provided with a transmission rack along the length direction, a driving shaft is vertically rotated at the bottom of the basic support frame, and the lower end of the driving shaft is provided with a transmission gear meshing with the transmission rack, and a movable control shaft is also rotatably provided above the basic support frame, an active bevel gear is provided at the output end of the movable control shaft, and a driven bevel gear meshing with the active bevel gear is provided at the upper end of the driving shaft.

[0017] The present application also provides a tensile test method suitable for a universal testing machine, which specifically comprises the following steps:

[0018] Step 1: Install the tensile test specimen in the tensile kettle body, wipe the tensile kettle body and the sealing surface of the tensile kettle cover with a paper towel, wipe the metal sealing ring clean and put it into the sealing groove on the top of the tensile kettle body, place the tensile kettle cover on the tensile kettle body, and tighten the bolts with a torque wrench to a torque of 260 to 300 N·m;

[0019] Step 2: Fill the stretching kettle body with inert gas three times from the air inlet of the stretching kettle cover. The inert gas is high-purity argon or high-purity nitrogen, so as to remove the air in the stretching kettle body. The inside of the stretching kettle body is in an inert gas protection state. Then, hydrogen is filled three times to remove the inert gas in the stretching kettle body.

[0020] Step 3, filling hydrogen into the stretching kettle body from the air inlet of the stretching kettle cover to a target value, and then heating the stretching kettle body to a target value through a heater;

[0021] Step 4: Push the mobile base frame along the ground track to the vicinity of the stretching machine, rotate the mobile control shaft to slowly push the stretching kettle body to the middle of the upper and lower stretching clamps, and use the limit bolts on the left and right rotating reaction frames and the bottom bolts of the second force arm lifting support plate to achieve left and right and horizontal adjustment of the stretching kettle body, so that the stretching axis on the stretching kettle body is aligned with the stretching machine clamp, and then loosen the bolts used for fixing between the stretching kettle body and the second force arm lifting support plate;

[0022] Step 5, open the slow tensile testing machine, clamp the chuck on the tensile axis of the kettle, input the test parameters such as the tensile rate or constant load value, install the non-contact strain measurement equipment, and start the test;

[0023] Step 6: The tensile specimen is broken or the test is carried out to the target time. After the test is completed, the relevant test data of displacement, load, time and strain are saved.

[0024] Step seven, use four bolts to fix the stretching kettle body and the second lever arm support plate, loosen the upper and lower clamps of the stretching machine, push out the movable base frame, turn off the kettle body heating switch to cool down the stretching kettle body. When the temperature drops to 80°C, open the stretching kettle body, take out the stretching specimen, and cover the stretching kettle cover to end the test.

[0025] Compared with the prior art, the advantage of the present application is that it provides a highly flexible and detachable tensile test device, which is particularly suitable for universal testing machines, and has made significant progress in solving the problems of lack of flexibility, limited performance and inaccurate strain measurement in the combination of traditional integrated hydrogen environment chamber and testing machine. By adopting the design of mobile base frame and power support assembly, the present application not only realizes the convenient installation and disassembly of the tensile kettle body on different testing machines, but also greatly improves the flexibility and applicability of the test. In addition, the heating and sealing system of the detachable tensile kettle ensures the accuracy of the test under high pressure and high temperature hydrogen environment, and the application of non-contact strain measurement equipment effectively overcomes the limitation of environmental factors on the acquisition of material deformation data. In particular, the lifting and rotating mechanism in the power support assembly and the high-performance servo electric cylinder on the basic support frame jointly realize the precise control and positioning of the tensile kettle body, providing a solid foundation for the reliability of the test results. These designs not only improve the test efficiency, but also provide researchers with a wider test parameter adjustment space, making the test conditions closer to the actual application scenario, which is helpful to fully explore the long-term mechanical behavior of the metal sealing layer under high pressure and high temperature hydrogen environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a structural schematic diagram of a mobile and detachable high-temperature and high-pressure hydrogen environment in-situ tensile testing device of the present application;

[0027] Figure 2 This is a side view structural schematic diagram of a mobile and detachable high-temperature and high-pressure hydrogen environment in-situ tensile testing device of the present application;

[0028] Figure 3 A schematic diagram of the structure of the detachable stretching kettle in this application;

[0029] Figure 4 It is a schematic diagram of the structure of the power support assembly in this application;

[0030] Figure 5 It is a schematic diagram of the internal structure of the observation window in this application;

[0031] Figure 6 It is a schematic diagram of the structure of the present application without the power support assembly;

[0032] Figure 7 It is a side view schematic diagram of the structure of the present application without the power support assembly.

[0033] As shown in the figure: 1. Gravity balance plate, 2. Basic support frame, 3. Guide rail, 4. Rolling wheel, 5. Hollow support column, 6. First lever arm lifting support plate, 7. Second lever arm lifting support plate, 8. First lifting sleeve, 9. Second lifting sleeve, 10. First mounting arm, 11. Second mounting arm, 12. Stretching kettle body, 13. Stretching kettle cover, 14. Stretching shaft, 15. Connecting screw, 16. Heater, 17. Air inlet and outlet, 18. Thermocouple installation port, 19. Pressure sensor, 20. Water cooling jacket , 21. Servo motor, 22. Ball screw, 23. Guide hole, 24. Servo electric cylinder, 25. Hollow steel body, 26. Window glass mounting tube, 27. Window glass, 28. Pressing nut, 29. High-performance plastic padding layer, 30. O-ring, 31. Left and right rotating reaction frame, 32. Opening, 33. Extension plate, 34. Limiting bolt, 35. Transmission rack, 36. Drive shaft, 37. Transmission gear, 38. Mobile control shaft, 39. Active bevel gear, 40. Driven bevel gear. DETAILED DESCRIPTION

[0034] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0035] The specific implementation of the present invention is further described below in conjunction with the accompanying drawings, wherein the same components are represented by the same reference numerals.

[0036] It should be noted that the words "front", "rear", "left", "right", "up" and "down" used in the following description refer to directions in the drawings, and the words "inside" and "outside" refer to directions toward or away from the geometric center of a specific component, respectively.

[0037] In order to make the contents of the present invention more clearly understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0038] Refer to the attached Figure 1 -Attached Figure 2 In order to solve the above technical problems, the technical solution provided by the present invention is: a mobile and detachable high temperature and high pressure hydrogen environment in-situ tensile testing device, comprising:

[0039] A mobile base frame, comprising a gravity balance plate 1 and a basic support frame 2, wherein a guide rail 3 is provided above the gravity balance plate 1 along the length direction and the basic support frame 2 slides on the guide rail 3 through a slider at the bottom, and rolling wheels 4 are also provided on both sides of the gravity balance plate 1;

[0040] The power support assembly includes a hollow support column 5, a first lever arm lifting support plate 6 and a second lever arm lifting support plate 7. The hollow support column 5 is provided with a first lifting sleeve 8 and a second lifting sleeve 9 that can be lifted and lowered. The first lifting sleeve 8 and the second lifting sleeve 9 are respectively provided with a first mounting arm 10 and a second mounting arm 11 that can rotate. The first lever arm lifting support plate 6 and the second lever arm lifting support plate 7 are respectively installed at the front ends of the first mounting arm 10 and the second mounting arm 11, and counterweights are also installed at the rear ends of the first mounting arm 10 and the second mounting arm 11 to maintain balance.

[0041] The detachable stretching kettle comprises a stretching kettle body 12, a stretching kettle cover 13 and a stretching shaft 14. The stretching kettle body 12 is fixed to the second lever arm lifting support plate 7 by bolts. The stretching kettle cover 13 is buckled on the stretching kettle body 12 and fastened by circumferentially distributed bolts. The bottom of the first lever arm lifting support plate 6 is also provided with a connecting screw 15 threadedly connected to the stretching kettle cover 13. A stretching specimen is installed inside the stretching kettle body 12 through a specimen fixing bracket. The stretching shaft 14 is installed above the stretching kettle cover 13 and the bottom end of the stretching shaft 14 is connected to the stretching specimen in the stretching kettle body 12.

[0042] In a specific embodiment, the present application focuses on the heating and sealing system of the stretching kettle body 12, which is the key to ensure the accuracy of the test in a high-pressure, high-temperature hydrogen environment. The outer side of the stretching kettle body 12 is wrapped with a heater 16, which uses an advanced heating element and can evenly and quickly increase the temperature of the stretching kettle body 12 to a preset range to meet the requirements of material mechanical properties testing in a high-temperature environment. In order to accurately control the temperature, a thermocouple installation port 18 is provided on the stretching kettle cover 13, through which the thermocouple is inserted into the kettle to monitor temperature changes in real time, and is connected to an external temperature control system to achieve closed-loop temperature control.

[0043] In addition, refer to the attached Figure 3 The stretching kettle cover 13 is also equipped with an air inlet and outlet 17 and a pressure sensor 19. The air inlet and outlet are used for charging and discharging hydrogen, while the pressure sensor continuously monitors the pressure in the kettle to ensure that the test is carried out under the set pressure conditions. In particular, the seal between the stretching shaft 14 and the stretching kettle cover 13 adopts multiple sealing forms such as O-rings, flexible graphite, and spring energy storage. These combined sealing structures can effectively prevent the leakage of high-pressure hydrogen, while allowing the stretching shaft to be dynamically displaced during the test, ensuring the continuity and safety of the test. In order to further protect the stretching shaft 14 and its sealing structure, the outside of the stretching shaft 14 is wrapped with a water cooling jacket 20 to effectively prevent sealing failure and material property changes caused by high temperature.

[0044] Refer to the attached Figure 4The core of the power support assembly lies in its unique lifting and rotation mechanism. The hollow support column 5, as the main body of the support structure, not only provides the necessary strength, but also cleverly builds in a ball screw 22 system driven by a servo motor 21. This design allows the first lifting sleeve 8 to achieve smooth and precise vertical movement in the guide hole 23, with a movement accuracy of up to micron level, which is crucial for testing the mechanical properties of materials under high pressure and high temperature environments. The closed-loop control system of the servo motor 21, combined with the high-efficiency transmission of the ball screw 22, ensures the smoothness and repeatability of the lifting process, providing a solid foundation for the reliability of the test results.

[0045] In order to further enhance the flexibility of the device, a high-performance servo electric cylinder 24 is installed on the bottom side of the basic support frame 2. The servo electric cylinder 24 not only provides additional power support for the second lifting sleeve 9, enabling it to respond quickly and adjust the height when needed, but also realizes fine-tuning of the lifting process through a precise control system, ensuring that the stretching kettle body 12 can be accurately positioned to the required position in different test stages. This design not only improves the test efficiency, but also provides researchers with a wider test parameter adjustment space, making the test conditions closer to the actual application scenario.

[0046] In addition, the power support assembly also incorporates a humanized design concept. The first force arm lifts the support plate 6 and the second force arm lifts the support plate 7. By designing a rotatable first mounting arm 10 and a second mounting arm 11, researchers can flexibly adjust the direction and angle of the tensile kettle body 12 according to test requirements, which is convenient for docking with the fixture of the universal testing machine, and also provides convenience for observing, recording and analyzing test results.

[0047] Refer to the attached Figure 5In order to facilitate observation of the test condition of the stretching kettle body 12, an observation window is also provided on one side of the stretching kettle body 12. The observation window includes a hollow steel body 25 seamlessly welded to the side wall of the stretching kettle body 12. A window glass mounting tube 26 is installed at one end of the hollow steel body 25 away from the stretching kettle body 12 through bolts. A mounting groove is provided at one end of the window glass mounting tube 26 away from the hollow steel body 25, and a window glass 27 is clamped in the mounting groove. A clamping nut 28 for clamping the window glass 27 is also threadedly connected to the outside of the mounting groove. A high-performance plastic gasket layer 29 located at the front end of the window glass 27 and an O-ring 30 located at the rear end of the window glass 27 are also provided in the mounting groove of the window glass mounting tube 26. The design of the sight glass installation tube 26 allows the sight glass 27 to be replaced without damaging the sealing of the kettle body, and the double sealing structure of the high-performance plastic gasket layer 29 and the O-ring 30 further improves the sealing performance to prevent leakage of high-pressure hydrogen, wherein the high-performance plastic gasket layer 29 can be made of peek material. In addition, the compression nut 28 ensures that the sight glass is firmly fixed in the installation slot to prevent loosening caused by high pressure or temperature changes.

[0048] Refer to the attached Figure 6 -Attached Figure 7 In a specific embodiment, the basic support frame 2 is provided with a left-right rotating reaction frame 31 located on one side of the hollow supporting column 5, and the left-right rotating reaction frame 31 is provided with an opening 32 for the second lever arm lifting support plate 7 to pass through, and extension plates 33 are respectively provided on both sides of the front end of the opening 32, and limiting bolts 34 are threadedly connected on the extension plates 33 on both sides. In the present application, the second lever arm lifting support plate 7 is arranged through the opening 32, and the opening 32 has a certain limiting effect on the rotation direction of the second lever arm lifting support plate 7. By screwing the limiting bolts 34 into the extension plates 33 on both sides, the ends of the limiting bolts 34 can correspondingly limit the left and right positions of the second lever arm lifting support plate 7, so that the stretching kettle body 12 on the second lever arm lifting support plate 7 can be slightly adjusted left and right.

[0049] In order to achieve precise adjustment of the stretching kettle body 12 in the horizontal direction and ensure precise alignment with the stretching machine, the gravity balance plate 1 is provided with a transmission rack 35 along the length direction, and a drive shaft 36 is provided at the bottom of the basic support frame 2 for vertical rotation, and a transmission gear 37 meshing with the transmission rack 35 is provided at the lower end of the drive shaft 36. A mobile control shaft 38 is also rotatably provided above the basic support frame 2, and an active bevel gear 39 is provided at the output end of the mobile control shaft 38, and a driven bevel gear 40 meshing with the active bevel gear 39 is provided at the upper end of the drive shaft 36. The design of the gravity balance plate 1 effectively balances the overall weight of the device, making it easier to move. The combination of the guide rail 3 and the rolling wheel 4 ensures the smooth movement of the base frame on the ground track. The transmission system of the transmission rack 35, the transmission gear 37, the active bevel gear 39 and the driven bevel gear 40 realizes the precise adjustment of the stretching kettle body 12 in the horizontal direction by rotating the mobile control shaft 38, ensuring the precise alignment with the stretching machine, laying a foundation for the successful test. The specific adjustment principle is: by rotating the mobile control shaft 38 by the handle, the mobile control shaft 38 drives the active bevel gear 39 at its end to rotate, the active bevel gear 39 cooperates with the driven bevel gear 40 to drive the drive shaft 36 to rotate, the drive shaft 36 drives the transmission gear 37 to rotate, and the transmission gear 37 is meshed with the transmission rack 35 for transmission, thereby being able to drive the entire basic support frame 2 to move back and forth on the gravity balance plate 1.

[0050] The present application also provides a tensile test method suitable for a universal testing machine, which specifically comprises the following steps:

[0051] Step 1: Install the tensile test specimen in the tensile kettle body 12, wipe the sealing surfaces of the tensile kettle body 12 and the tensile kettle cover 13 with a paper towel, wipe the metal sealing ring clean and put it into the sealing groove on the top of the tensile kettle body 12, place the tensile kettle cover 13 on the tensile kettle body, and tighten the bolts with a torque wrench, with a torque of 260 to 300 N·m;

[0052] Step 2: Inert gas is filled into the stretching kettle body 12 three times from the air inlet of the stretching kettle cover 13. The inert gas is high-purity argon or high-purity nitrogen, so that the air in the stretching kettle body 12 is removed. The interior of the stretching kettle body 12 is in an inert gas protection state, and then hydrogen is filled three times to remove the inert gas in the stretching kettle body 12;

[0053] Step 3, hydrogen is charged into the stretching kettle body 12 from the air inlet of the stretching kettle cover 13 to a target value, and then the stretching kettle body 12 is heated to a target value by the heater 16;

[0054] Step 4: Push the mobile base frame along the ground track to the vicinity of the stretching machine, rotate the mobile control shaft 38 to slowly push the stretching kettle body 12 to the middle of the upper and lower stretching clamps, and use the limit bolts on the left and right rotating reaction frame 31 and the bottom bolts of the second force arm lifting support plate 7 to achieve left and right and horizontal adjustment of the stretching kettle body 12, so that the stretching shaft 14 on the stretching kettle body 12 is aligned with the stretching machine clamp, and then loosen the bolts used for fixing between the stretching kettle body 12 and the second force arm lifting support plate 7;

[0055] Step 5, open the slow tensile testing machine, clamp the chuck on the kettle tensile shaft 14, input the test parameters such as the tensile rate or constant load value, install the non-contact strain measurement equipment, and start the test;

[0056] Step 6: The tensile specimen is broken or the test is carried out to the target time. After the test is completed, the relevant test data of displacement, load, time and strain are saved.

[0057] Step seven, use four bolts to fix the stretching kettle body 12 and the second lever arm support plate 7, loosen the upper and lower clamps of the stretching machine, push out the movable base frame, turn off the kettle body heating switch, and cool the stretching kettle body 12. When the temperature drops to 80°C, open the stretching kettle body 12, take out the stretching specimen, and cover the stretching kettle cover 13 to end the test.

[0058] The present invention and its embodiments are described above, and such description is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if ordinary technicians in the field are inspired by it, without departing from the purpose of the invention, they can design a structure and embodiment similar to the technical solution without creativity, which should belong to the protection scope of the present invention.

Claims

1. A mobile and detachable high temperature and high pressure hydrogen environment in-situ tensile testing device, suitable for a universal testing machine, characterized in that: include: A mobile base frame, comprising a gravity balance plate (1) and a base support frame (2), wherein a guide rail (3) is provided above the gravity balance plate (1) along the length direction and the base support frame (2) slides on the guide rail (3) via a slider at the bottom, and rolling wheels (4) are also provided on both sides of the gravity balance plate (1); A power support assembly comprises a hollow support column (5), a first lever arm lifting support plate (6) and a second lever arm lifting support plate (7); the hollow support column (5) is provided with a first lifting sleeve (8) and a second lifting sleeve (9) which can be lifted and lowered; the first lifting sleeve (8) and the second lifting sleeve (9) are respectively provided with a first mounting arm (10) and a second mounting arm (11) which can rotate; and the first lever arm lifting support plate (6) and the second lever arm lifting support plate (7) are respectively installed at the front ends of the first mounting arm (10) and the second mounting arm (11); A detachable stretching kettle comprises a stretching kettle body (12), a stretching kettle cover (13) and a stretching shaft (14); the stretching kettle body (12) is fixed to a second lever arm lifting support plate (7) by bolts; the stretching kettle cover (13) is buckled on the stretching kettle body (12) and fastened by bolts distributed around the circumference; the bottom of the first lever arm lifting support plate (6) is also provided with a connecting screw (15) threadedly connected to the stretching kettle cover (13); a stretching specimen is installed inside the stretching kettle body (12) via a specimen fixing bracket; the stretching shaft (14) is installed above the stretching kettle cover (13) and the bottom end of the stretching shaft (14) is connected to the stretching specimen in the stretching kettle body (12).

2. The mobile and detachable high temperature and high pressure hydrogen environment in-situ tensile testing device according to claim 1 is characterized in that: The outer side of the stretching kettle body (12) is wrapped with a heater (16), the stretching kettle cover (13) is also provided with an air inlet and outlet (17), a thermocouple installation port (18) and a pressure sensor (19), and the outer side of the stretching shaft (14) is also wrapped with a water cooling jacket (20).

3. The mobile and detachable high temperature and high pressure hydrogen environment in-situ tensile testing device according to claim 1, characterized in that: A servo motor (21) is provided at the upper end of the hollow support column (5); an output shaft of the servo motor (21) is provided with a ball screw (22) located inside the hollow support column (5); guide holes (23) are also provided on both sides of the outer wall of the hollow support column (5); the first lifting sleeve (8) is slidably arranged in the guide hole (23) and is threadedly sleeved on the ball screw (22) through a screw nut.

4. The mobile and detachable high temperature and high pressure hydrogen environment in-situ tensile testing device according to claim 1, characterized in that: A servo electric cylinder (24) is also provided on the bottom side of the basic support frame (2), and the output end of the servo electric cylinder (24) extends into the interior of the hollow support column (5) and is connected to the second lifting sleeve (9).

5. The mobile and detachable high temperature and high pressure hydrogen environment in-situ tensile testing device according to claim 1, characterized in that: An observation window is also provided on one side of the stretching kettle body (12), and the observation window comprises a hollow steel body (25) seamlessly welded to the side wall of the stretching kettle body (12); a window glass mounting tube (26) is installed at one end of the hollow steel body (25) away from the stretching kettle body (12) via bolts; a mounting notch is provided at one end of the window glass mounting tube (26) away from the hollow steel body (25), and a window glass (27) is clamped in the mounting notch; a clamping nut (28) for clamping the window glass (27) is also threadedly connected to the outside of the mounting notch.

6. The mobile and detachable high-temperature and high-pressure hydrogen environment in-situ tensile testing device according to claim 5, characterized in that: The installation notch of the window glass installation tube (26) is also provided with a high-performance plastic padding layer (29) located at the front end of the window glass (27) and an O-type sealing ring (30) located at the rear end of the window glass (27).

7. The mobile and detachable high temperature and high pressure hydrogen environment in-situ tensile testing device according to claim 1, characterized in that: The basic support frame (2) is provided with a left-right rotating reaction frame (31) located on one side of the hollow supporting column (5), and the left-right rotating reaction frame (31) is provided with an opening (32) for the second lever arm to lift the supporting plate (7) to pass through, and extension plates (33) are respectively provided on both sides of the front end of the opening (32), and limiting bolts (34) are threadedly connected to the extension plates (33) on both sides.

8. The mobile and detachable high temperature and high pressure hydrogen environment in-situ tensile testing device according to claim 1, characterized in that: The gravity balance plate (1) is provided with a transmission rack (35) along the length direction; a driving shaft (36) is provided at the bottom of the basic support frame (2) for vertical rotation, and a transmission gear (37) meshing with the transmission rack (35) is provided at the lower end of the driving shaft (36); a moving control rotating shaft (38) is also rotatably provided above the basic support frame (2); an active bevel gear (39) is provided at the output end of the moving control rotating shaft (38); and a driven bevel gear (40) meshing with the active bevel gear (39) is provided at the upper end of the driving shaft (36).

9. A tensile test method suitable for a universal testing machine, characterized in that: The specific steps include: Step 1: Install the tensile test specimen in the tensile kettle body (12), wipe the sealing surfaces of the tensile kettle body (12) and the tensile kettle cover (13) with a paper towel, wipe the metal sealing ring clean and put it into the sealing groove on the top of the tensile kettle body (12), place the tensile kettle cover (13) on the tensile kettle body, and tighten the bolts with a torque wrench, with a torque of 260 to 300 N·m; Step 2: Inert gas is charged three times into the stretching kettle body (12) from the air inlet of the stretching kettle cover (13), and the inert gas is high-purity argon or high-purity nitrogen, so that the air in the stretching kettle body (12) is removed, and the interior of the stretching kettle body (12) is in an inert gas protection state, and then hydrogen is charged three times to remove the inert gas in the stretching kettle body (12); Step 3, hydrogen is charged into the stretching kettle body (12) from the air inlet of the stretching kettle cover (13) to a target value, and then the stretching kettle body (12) is heated to a target value by the heater (16); Step 4: Push the mobile base frame along the ground track to the vicinity of the stretching machine, rotate the mobile control shaft (38) to slowly push the stretching kettle body (12) to the middle of the upper and lower stretching clamps, and use the limit bolts on the left and right rotating reaction frame (31) and the bottom bolts of the second force arm lifting support plate (7) to achieve left and right and horizontal adjustment of the stretching kettle body (12), so that the stretching shaft (14) on the stretching kettle body (12) is aligned with the stretching machine clamp, and then loosen the bolts used for fixing between the stretching kettle body (12) and the second force arm lifting support plate (7); Step 5, open the slow tensile testing machine, clamp the chuck on the kettle body tensile shaft (14), input the test parameters such as the tensile rate or constant load value, install the non-contact strain measurement equipment, and start the test; Step 6: The tensile specimen is pulled apart or the test is carried out to the target time. After the test is completed, the relevant test data of displacement, load, time and strain are saved; Step seven, use four bolts to fix the stretching kettle body (12) and the second lever arm support plate (7), loosen the upper and lower clamps of the stretching machine, push out the movable base frame, turn off the kettle body heating switch, and cool the stretching kettle body (12). When the temperature drops to 80°C, open the stretching kettle body (12), take out the stretching specimen, and cover the stretching kettle cover (13) to end the test.

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