A mobile detachable high-temperature high-pressure hydrogen environment in-situ tensile test device and method

Abstract

The application provides a mobile assembly and disassembly type high-temperature and high-pressure hydrogen environment in-situ tensile test device and method, which is suitable for a universal testing machine. The device comprises a mobile base frame, a power support assembly and an assembly and disassembly type tensile kettle. The base frame is provided with a gravity balance plate and a guide rail, and a support frame sliding block slides on the guide rail, facilitating movement. The power support assembly comprises a hollow support column, a lifting sleeve, a mounting arm and a lifting support plate, and realizes the lifting and rotation of the tensile kettle. The tensile kettle is composed of a kettle body, a kettle cover and a tensile shaft, can fix a tensile sample, and prevents high-pressure hydrogen gas leakage through a combined sealing form. The method comprises the steps of sample installation, gas charging and discharging, temperature rising, alignment, tensile test, data saving and temperature lowering and disassembly. The application solves the problems of poor flexibility, limited performance and inaccurate strain measurement of the traditional device, improves the test efficiency and applicability, and helps to explore the long-term mechanical behavior of the metal sealing layer in the high-pressure and high-temperature hydrogen environment.

Description

Technical Field

[0001] This invention relates to the field of material mechanical property testing technology, specifically to a mobile, detachable, high-temperature, high-pressure hydrogen environment in-situ tensile testing device and method, applicable to universal testing machines. Background Technology

[0002] New energy sources such as solar and wind power have attracted much attention due to their abundant resources and clean, environmentally friendly nature. However, the stability of power generation from these energy sources has always been a key factor restricting their development. Therefore, reasonable energy storage methods are crucial for ensuring the stable operation of the power grid. Underground hydrogen storage, especially using large-scale lined cavern (LRC) high-pressure gas storage facilities, 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 flexible establishment of large-scale lined cavern underground hydrogen storage systems using abundant clean energy is 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, long-term underground hydrogen storage is the effective storage of hydrogen gas. During the operation of hydrogen storage facilities or pipeline transportation, metal materials come into direct contact with high-pressure hydrogen gas, which can easily lead to hydrogen embrittlement and significantly reduce the durability of the materials. Therefore, research on the storage of hydrogen and other gases 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 device to comprehensively investigate the long-term mechanical behavior of the metal sealing layer.

[0004] Traditional testing equipment typically combines an integrated hydrogen environment chamber with a testing machine, which lacks flexibility and cannot be disassembled, limiting its applicability to different testing machines. Integrated devices also have performance limitations in terms of testing machines, and the selected testing machines are usually of lower performance, failing to meet high-standard testing requirements. In terms of strain measurement of specimens inside the reactor, traditional methods mostly use contact strain measurement, which cannot accurately obtain material deformation data due to environmental limitations. Summary of the Invention

[0005] The technical problem to be solved by this invention is to overcome the above-mentioned technical defects and provide a mobile, detachable, high-temperature, high-pressure hydrogen environment in-situ tensile testing device and method. This device has high flexibility and accuracy, enabling mechanical testing of metallic materials in situ under high temperature and high pressure hydrogen conditions, and allowing for more precise strain measurement of specimens inside the reactor.

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

[0007] A movable base frame includes a gravity balance plate and a base support frame. A guide rail is provided above the gravity balance plate along its length, and the base support frame slides on the guide rail via a slider at the bottom. Rolling wheels are also provided on both sides of the gravity balance plate.

[0008] A power support assembly includes a hollow support column, a first lever arm lifting support plate, and a second lever arm lifting support plate. The hollow support column is fitted with a first lifting sleeve and a second lifting sleeve that can be raised and lowered. The first lifting sleeve and the second lifting sleeve are respectively provided with a first mounting arm and a second mounting arm that can be rotated. The first lever arm lifting support plate and the second lever arm lifting support plate are respectively installed at the front end of the first mounting arm and the second mounting arm.

[0009] A detachable tensile testing vessel includes a tensile testing vessel body, a tensile testing vessel cover, and a tensile shaft. The tensile testing vessel body is fixed to a second lever arm support plate by bolts. The tensile testing vessel cover is fastened to the tensile testing vessel body by circumferentially distributed bolts. The bottom of the first lever arm support plate is also provided with a connecting screw threaded to the tensile testing vessel cover. A tensile test specimen is installed inside the tensile testing vessel body through a test specimen fixing bracket. The tensile shaft is installed above the tensile testing vessel cover, and the bottom end of the tensile shaft is connected to the tensile test specimen inside the tensile testing vessel body.

[0010] Preferably, the outer side of the stretching vessel body is wrapped with a heater, and the stretching vessel cover is also provided with an air inlet / outlet, a thermocouple mounting port and a pressure sensor. The stretching shaft and the stretching vessel cover are dynamically sealed by a combination of O-rings, flexible graphite, spring energy storage and other sealing methods. The stretching shaft is also wrapped with a water cooling jacket.

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

[0012] Preferably, the bottom side of the base support frame is also provided with a servo electric cylinder, the output end of which extends into the hollow support column and is connected to the second lifting sleeve.

[0013] Preferably, an observation window is provided on one side of the stretching vessel body. The observation window includes a hollow steel body seamlessly welded to the side wall of the stretching vessel body. A viewing glass mounting tube is bolted to the end of the hollow steel body away from the stretching vessel body. An installation slot is provided at the end of the viewing glass mounting tube away from the hollow steel body, and a viewing glass is inserted into the installation slot. A clamping nut for pressing the viewing glass is also threaded to the outside of the installation slot.

[0014] Preferably, the mounting groove of the window glass mounting tube is further provided with a high-performance plastic pad layer located at the front end of the window glass and an O-ring seal located at the rear end of the window glass.

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

[0016] Preferably, the gravity balance plate is provided with a transmission rack along its length, the bottom of the base support frame is provided with a drive shaft that rotates vertically and the lower end of the drive shaft is provided with a transmission gear that meshes with the transmission rack, and a movement control shaft is also provided on the top of the base support frame. The output end of the movement control shaft is provided with a driving bevel gear, and the upper end of the drive shaft is provided with a driven bevel gear that meshes with the driving bevel gear.

[0017] This application also provides a tensile testing method suitable for a universal testing machine, specifically including the following steps:

[0018] Step 1: Install the tensile specimen in the tensile test vessel. Wipe the tensile test vessel and the sealing surface of the tensile test vessel lid clean with a paper towel. After cleaning the metal sealing ring, place it in the sealing groove at the top of the tensile test vessel. Place the tensile test vessel lid on the tensile test vessel and tighten the bolts with a torque wrench. The torque is 260-300 N·m.

[0019] Step 2: Inert gas is introduced into the stretching vessel three times through the air inlet of the stretching vessel lid. The inert gas is high-purity argon or high-purity nitrogen, thereby removing the air from the stretching vessel and placing the inside of the stretching vessel in an inert gas protection state. Then, hydrogen is introduced three times to remove the inert gas from the stretching vessel.

[0020] Step 3: Inject hydrogen into the stretching vessel through the gas inlet of the stretching vessel lid to the target value, and then heat the stretching vessel to the target value through the heater.

[0021] Step 4: Push the movable base frame along the ground track to the vicinity of the stretching machine. Rotate the movable control shaft to slowly push the stretching vessel body to the middle of the upper and lower stretching clamps. Use the limiting bolts on the left and right rotating reaction frame and the bottom bolts of the second lever arm support plate to adjust the stretching vessel body left and right and horizontally, so that the stretching shaft on the stretching vessel body is aligned with the stretching machine clamps. Then loosen the bolts used to fix the stretching vessel body and the second lever arm support plate.

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

[0023] Step 6: The tensile specimen breaks or the test continues until the target time. After the test, save the relevant test data of displacement, load, time, and strain.

[0024] Step 7: Use four bolts to fix the tensile vessel body to the second lever arm support plate, loosen the upper and lower clamps of the tensile machine, push out the movable base frame, turn off the vessel body heating switch, and allow the tensile vessel body to cool down. When the temperature drops to 80℃, open the tensile vessel body, take out the tensile sample, and close the tensile vessel lid to end the test.

[0025] Compared with existing technologies, this application offers a highly flexible and detachable tensile testing device, particularly suitable for universal testing machines. It represents a significant advancement in addressing the limitations of traditional integrated hydrogen environment chambers and testing machine combinations, including a lack of flexibility, performance constraints, and inaccurate strain measurements. By employing a movable base frame and power support assembly, this application not only enables convenient installation and disassembly of the tensile vessel on different testing machines but also greatly enhances the flexibility and applicability of the testing. Furthermore, the heating and sealing system of the detachable tensile vessel ensures the accuracy of testing under high-pressure, high-temperature hydrogen conditions, while the application of non-contact strain measurement equipment effectively overcomes the limitations imposed by environmental factors on the acquisition of material deformation data. In particular, the lifting and rotation mechanisms in the power support assembly, along with the high-performance servo electric cylinders on the base support frame, jointly achieve precise control and positioning of the tensile vessel, providing a solid foundation for the reliability of test results. These designs not only improve testing efficiency but also provide researchers with a wider range of test parameter adjustments, making the testing conditions closer to actual application scenarios, thereby facilitating a comprehensive investigation of the long-term mechanical behavior of metal sealing layers under high-pressure, high-temperature hydrogen conditions. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of a mobile, detachable, high-temperature and high-pressure hydrogen environment in-situ tensile testing device according to this application.

[0027] Figure 2 This is a side view of the structure of a mobile, detachable, high-temperature and high-pressure hydrogen environment in-situ tensile testing device according to this application.

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

[0029] Figure 4 This is a schematic diagram of the power support component in this application;

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

[0031] Figure 6 This is a structural schematic diagram of the power support assembly removed in this application;

[0032] Figure 7 This is a side view of the structure of the present application with the power support component removed.

[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 vessel body, 13. Stretching vessel cover, 14. Stretching shaft, 15. Connecting screw, 16. Heater, 17. Inlet and outlet, 18. Thermocouple mounting 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. Compression nut; 29. ​​High-performance plastic gasket layer; 30. O-ring seal; 31. Left and right rotation reaction frame; 32. Opening; 33. Extension plate; 34. Limiting bolt; 35. Transmission rack; 36. Drive shaft; 37. Transmission gear; 38. Movement control shaft; 39. Driving bevel gear; 40. Driven bevel gear. Detailed Implementation

[0034] The present invention will now be described in further detail with reference to the accompanying drawings.

[0035] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings. Identical components are indicated by the same reference numerals.

[0036] It should be noted that the terms “front,” “back,” “left,” “right,” “up,” and “down” used in the following description refer to the directions shown in the attached diagram, while the terms “inside” and “outside” refer to the directions toward or away from the geometric center of a specific component, respectively.

[0037] To make the content of this invention easier to understand, the technical solutions in the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings.

[0038] See attached document Figure 1 -Appendix Figure 2 To solve the above-mentioned technical problems, the technical solution provided by the present invention is: a mobile, detachable, high-temperature, high-pressure hydrogen environment in-situ tensile testing device, comprising:

[0039] A movable base frame includes a gravity balance plate 1 and a base support frame 2. 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 through a slider at the bottom. 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 fitted with a first lifting sleeve 8 and a second lifting sleeve 9 that can be raised 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 be rotated. 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 counterweight is also installed at the rear ends of the first mounting arm 10 and the second mounting arm 11 to maintain balance.

[0041] The detachable tensile testing vessel includes a tensile testing vessel body 12, a tensile testing vessel cover 13, and a tensile shaft 14. The tensile testing vessel body 12 is fixed to the second lever arm support plate 7 by bolts. The tensile testing vessel cover 13 is fastened to the tensile testing vessel body 12 by circumferentially distributed bolts. The bottom of the first lever arm support plate 6 is also provided with a connecting screw 15 that is threaded to the tensile testing vessel cover 13. The tensile test specimen is installed inside the tensile testing vessel body 12 through a test specimen fixing bracket. The tensile shaft 14 is installed above the tensile testing vessel cover 13, and the bottom end of the tensile shaft 14 is connected to the tensile test specimen inside the tensile testing vessel body 12.

[0042] In one specific embodiment, this application focuses on the heating and sealing system of the tensile testing vessel 12, which is crucial for ensuring the accuracy of testing under high pressure and high temperature hydrogen conditions. The outer side of the tensile testing vessel 12 is encased in a heater 16, which employs advanced heating elements to uniformly and rapidly raise the temperature of the vessel 12 to a preset range, meeting the requirements for material mechanical property testing under high-temperature conditions. For precise temperature control, the vessel lid 13 is provided with a thermocouple mounting port 18. A thermocouple is inserted into the vessel through this port 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 appendix Figure 3 The tensile reactor lid 13 is also equipped with inlet / outlet ports 17 and a pressure sensor 19. The inlet / outlet ports are used for hydrogen charging and discharging, while the pressure sensor continuously monitors the internal pressure to ensure the test is conducted under the set pressure conditions. Specifically, the seal between the tensile shaft 14 and the tensile reactor lid 13 employs multiple sealing methods, including O-rings, flexible graphite, and spring energy storage. This combined sealing structure effectively prevents high-pressure hydrogen leakage while allowing the tensile shaft to move dynamically during the test, ensuring the continuity and safety of the test. To further protect the tensile shaft 14 and its sealing structure, the tensile shaft 14 is externally wrapped with a water-cooling jacket 20, effectively preventing seal failure and material property changes caused by high temperatures.

[0044] See attached document Figure 4The core of the power support component 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 integrates 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 within the guide hole 23, with a movement accuracy down to the micrometer level. This 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] To further enhance the flexibility of the device, a high-performance servo electric cylinder 24 is equipped on the bottom side of the base 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 its height when needed, but also achieves fine-tuning of the lifting process through a precise control system, ensuring that the tensile vessel 12 can be accurately positioned to the required location in different testing stages. This design not only improves testing efficiency but also provides researchers with a wider range of test parameter adjustments, making the testing conditions closer to actual application scenarios.

[0046] Furthermore, the power support assembly incorporates a human-centered design philosophy. The first lever arm support plate 6 and the second lever arm support plate 7, through the design of the rotatable first mounting arm 10 and the second mounting arm 11, allow researchers to flexibly adjust the orientation and angle of the tensile vessel body 12 according to testing needs, facilitating docking with the fixtures of the universal testing machine, and also providing convenience for observing, recording, and analyzing test results.

[0047] See attached document Figure 5To facilitate observation of the testing of the tensile test vessel 12, an observation window is provided on one side of the tensile test vessel 12. The observation window includes a hollow steel body 25 seamlessly welded to the side wall of the tensile test vessel 12. A viewing glass mounting tube 26 is bolted to the end of the hollow steel body 25 away from the tensile test vessel 12. The end of the viewing glass mounting tube 26 away from the hollow steel body 25 is provided with a mounting groove, and a viewing glass 27 is inserted into the mounting groove. A clamping nut 28 for pressing the viewing glass 27 is also threaded to the outside of the mounting groove. A high-performance plastic pad layer 29 is located at the front end of the viewing glass 27 and an O-ring 30 is located at the rear end of the viewing glass 27. The design of the viewing window mounting tube 26 allows for replacement of the viewing window 27 without compromising the vessel's seal. The dual-seal structure of the high-performance plastic gasket layer 29 and the O-ring 30 further enhances the sealing performance, preventing high-pressure hydrogen leakage. The high-performance plastic gasket layer 29 can be made of PEEK material. Furthermore, the clamping nut 28 ensures the viewing window is securely positioned within the mounting slot, preventing loosening due to high pressure or temperature changes.

[0048] See attached document Figure 6 -Appendix Figure 7 In one specific embodiment, the base support frame 2 is provided with a left-right rotating reaction frame 31 located on one side of the hollow support column 5. 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. Extension plates 33 are provided on both sides of the front end of the opening 32, and limiting bolts 34 are threadedly connected to both extension plates 33. In this application, the second lever arm lifting support plate 7 is provided through the opening 32. The opening 32 plays a certain limiting role in 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 limit the left and right positions of the second lever arm lifting support plate 7 accordingly, thereby enabling slight left and right adjustments to the stretching vessel body 12 on the second lever arm lifting support plate 7.

[0049] To achieve precise horizontal adjustment of the stretching vessel 12 and ensure accurate alignment with the stretching machine, a gravity balance plate 1 is equipped with a transmission rack 35 along its length. A vertically rotating drive shaft 36 is mounted at the bottom of the base support frame 2, with a transmission gear 37 meshing with the transmission rack 35 at its lower end. A movement control shaft 38 is also rotatably mounted above the base support frame 2, with a driving bevel gear 39 at its output end. A driven bevel gear 40 meshing with the driving bevel gear 39 is mounted 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 movement easier. The combination of the guide rail 3 and the rolling wheels 4 ensures smooth movement of the base frame on the ground track. The transmission system consisting of the transmission rack 35, transmission gear 37, driving bevel gear 39, and driven bevel gear 40 achieves precise horizontal adjustment of the stretching vessel 12 by rotating and moving the control shaft 38. This ensures precise alignment with the stretching machine and lays the foundation for successful testing. The specific adjustment principle is as follows: rotating the handle moves the control shaft 38, which in turn drives the driving bevel gear 39 at its end to rotate. The driving bevel gear 39, in conjunction with the driven bevel gear 40, drives the drive shaft 36 to rotate. The drive shaft 36 then drives the transmission gear 37 to rotate. The transmission gear 37 meshes with the transmission rack 35, thereby enabling the entire base support frame 2 to move back and forth on the gravity balance plate 1.

[0050] This application also provides a tensile testing method suitable for a universal testing machine, specifically including the following steps:

[0051] Step 1: Install the tensile specimen in the tensile reactor body 12. Wipe the sealing surfaces of the tensile reactor body 12 and the tensile reactor cover 13 clean with a paper towel. After cleaning the metal sealing ring, place it in the sealing groove at the top of the tensile reactor body 12. Place the tensile reactor cover 13 on the tensile reactor body and tighten the bolts with a torque wrench. The torque is 260-300 N·m.

[0052] Step 2: Inert gas is introduced into the stretching vessel body 12 three times through the air inlet of the stretching vessel lid 13. The inert gas is high-purity argon or high-purity nitrogen, thereby removing the air from the stretching vessel body 12 and placing the stretching vessel body 12 in an inert gas protection state. Then, hydrogen is introduced three times to remove the inert gas from the stretching vessel body 12.

[0053] Step 3: Hydrogen gas is introduced into the stretching vessel body 12 through the gas inlet of the stretching vessel lid 13 to the target value, and then the stretching vessel body 12 is heated to the target value through the heater 16.

[0054] Step 4: Push the movable base frame along the ground track to the vicinity of the stretching machine. Rotate the movable control shaft 38 to slowly push the stretching vessel 12 to the middle of the upper and lower stretching clamps. Use the limiting bolts on the left and right rotating reaction frame 31 and the bottom bolts of the second lever arm support plate 7 to adjust the stretching vessel 12 left and right and horizontally, so that the stretching shaft 14 on the stretching vessel 12 is aligned with the stretching machine clamp. Then loosen the bolts used to fix the stretching vessel 12 and the second lever arm support plate 7.

[0055] Step 5: Turn on the slow tensile testing machine, clamp the chuck on the tensile shaft 14 of the vessel body, input the test parameters such as tensile rate or constant load value, install the non-contact strain measurement equipment, and start the test.

[0056] Step 6: The tensile specimen breaks or the test continues until the target time. After the test, save the relevant test data of displacement, load, time, and strain.

[0057] Step 7: Use four bolts to fix the tensile vessel body 12 to the second lever arm support plate 7, loosen the upper and lower clamps of the tensile machine, push out the movable base frame, turn off the vessel body heating switch, and let the tensile vessel body 12 cool down. When the temperature drops to 80℃, open the tensile vessel body 12, take out the tensile sample, and cover the tensile vessel lid 13 to end the test.

[0058] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the invention, such designs should fall within the protection scope of the present invention.

Claims

1. A mobile dismountable high-temperature high-pressure hydrogen environment in-situ tensile testing device, suitable for a universal testing machine, characterized in that, Include: Movable base frame, including gravity balance plate (1) and foundation support frame (2), the gravity balance plate (1) is provided with guide rail (3) along the length direction above, and the foundation support frame (2) is slid on the guide rail (3) by the slider at the bottom, the both sides of the gravity balance plate (1) are also provided with rolling wheel (4); Power support assembly, including hollow support column (5), first force arm lifting support plate (6) and second force arm lifting support plate (7), the hollow support column (5) is provided with first lifting sleeve (8) and second lifting sleeve (9) that can be lifted, the first lifting sleeve (8) and second lifting sleeve (9) are respectively provided with first mounting arm (10) and second mounting arm (11) that can be rotated, and first force arm lifting support plate (6) and second force arm lifting support plate (7) are respectively installed in the front end of first mounting arm (10) and second mounting arm (11); The detachable stretching kettle includes a stretching kettle body (12), a stretching kettle cover (13) and a stretching shaft (14), the stretching kettle body (12) is fixed on the second force arm lifting support plate (7) by bolts, the stretching kettle cover (13) is buckled on the stretching kettle body (12) and is fastened by circumferentially distributed bolts, the bottom of the first force arm lifting support plate (6) is further provided with a connecting screw (15) threadedly connected with the stretching kettle cover (13), the inside of the stretching kettle body (12) is provided with a stretching sample through a sample fixing support, and the stretching shaft (14) is installed above the stretching kettle cover (13) and the bottom end of the stretching shaft (14) is connected with the stretching sample in the stretching kettle body (12).

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

3. The mobile assembled and disassembled high-temperature and high-pressure hydrogen environment in-situ tensile testing device according to claim 2, characterized in that, The upper end of the hollow support column (5) is provided with a servo motor (21), the output shaft of the servo motor (21) is provided with a ball screw (22) located in the inside of the hollow support column (5), the both sides of the outer wall of the hollow support column (5) are further provided with guide holes (23), the first lifting sleeve (8) is slidably arranged in the guide holes (23) and is threadedly sleeved on the ball screw (22) through a screw nut.

4. The mobile assembled and disassembled high-temperature and high-pressure hydrogen environment in-situ tensile testing device according to claim 3, characterized in that, The bottom end side of the foundation support frame (2) is further provided with a servo cylinder (24), and the output end of the servo cylinder (24) extends into the inside of the hollow support column (5) and is connected with the second lifting sleeve (9).

5. The mobile assembled and disassembled high-temperature and high-pressure hydrogen environment in-situ tensile testing device according to claim 4, characterized in that, One side of the stretching kettle body (12) is further provided with an observation window, the observation window includes a hollow steel body (25) welded seamlessly to the side wall of the stretching kettle body (12), one end of the hollow steel body (25) away from the stretching kettle body (12) is provided with a window glass mounting pipe (26) through bolts, one end of the window glass mounting pipe (26) away from the hollow steel body (25) is provided with a mounting slot, and a window glass (27) is clamped in the mounting slot, and the outside of the mounting slot is further threadedly connected with a pressing nut (28) for pressing the window glass (27).

6. The mobile assembled and disassembled high-temperature and high-pressure hydrogen environment in-situ tensile testing device according to claim 5, characterized in that, The installation slot of the window glass installation pipe (26) is further provided with a high-performance plastic gasket layer (29) at the front end of the window glass (27) and an O-shaped sealing ring (30) at the rear end of the window glass (27).

7. The mobile assembled and disassembled high-temperature and high-pressure hydrogen environment in-situ tensile testing device according to claim 6, characterized in that, The base support frame (2) is provided with left and right rotating counterforce frames (31) on one side of the hollow support column (5), the rotating counterforce frames (31) are provided with openings (32) for the second force arm lifting support plate (7) to pass through, and the front ends of the openings (32) are further provided with extension plates (33), and the extension plates (33) are further provided with limiting bolts (34).

8. The mobile assembled and disassembled high-temperature and high-pressure hydrogen environment in-situ tensile testing device according to claim 7, characterized in that, The gravity balance plate (1) is provided with a transmission rack (35) along the length direction, the bottom of the base support frame (2) is vertically rotatably provided with a drive shaft (36), the lower end of the drive shaft (36) is provided with a transmission gear (37) engaged with the transmission rack (35), the upper side of the base support frame (2) is further rotatably provided with a movement control rotating shaft (38), the output end of the movement control rotating shaft (38) is provided with a driving bevel gear (39), and the upper end of the drive shaft (36) is provided with a driven bevel gear (40) engaged with the driving bevel gear (39).

9. A tensile test method suitable for a universal testing machine, using the mobile assembly and disassembly type high temperature and high pressure hydrogen environment in-situ tensile test device of claim 8, characterized in that, Specifically comprising the following steps: Step one, install the tensile specimen in the tensile kettle body (12), wipe the sealing surface of the tensile kettle body (12) and the tensile kettle cover (13) with a paper towel, and then put the metal sealing ring into the sealing groove at the top of the tensile kettle body (12) after wiping it clean, place the tensile kettle cover (13) on the tensile kettle body, and tighten the bolt with a torque wrench, the torque is 260-300 N.m; Step two, fill three times of inert gas into the tensile kettle body (12) from the gas inlet and outlet of the tensile kettle cover (13), the inert gas is high-purity argon or high-purity nitrogen, so as to remove the air in the tensile kettle body (12), and the inside of the tensile kettle body (12) is in an inert gas protection state, and then fill three times of hydrogen into the tensile kettle body (12) to remove the inert gas in the tensile kettle body (12); Step three, fill hydrogen into the tensile kettle body (12) from the gas inlet and outlet of the tensile kettle cover (13) until the target value, and then heat the tensile kettle body (12) to the target value by the heater (16); Step four, push the movable base frame along the ground track to the vicinity of the stretching machine, rotate the movement control rotating shaft (38) to slowly push the tensile kettle body (12) to the middle of the stretching upper and lower chuck, and use the limiting bolts on the left and right rotating counterforce frames (31) and the bolts on the bottom of the second force arm lifting support plate (7) to realize the left and right and horizontal adjustment of the tensile kettle body (12), so that the tensile shaft (14) on the tensile kettle body (12) is aligned with the clamp of the stretching machine, and then the bolts for fixing the tensile kettle body (12) and the second force arm lifting support plate (7) are loosened; Step five, open the slow stretching testing machine, clamp the chuck on the tensile shaft (14), input the tensile rate or constant load value test parameters, install the non-contact strain measurement device, and start the test; Step six, the tensile specimen is pulled off 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, using four bolts to fix the stretching kettle body (12) and the second force arm lifting support plate (7), loosen the upper and lower clamps of the stretching machine, push out the movable base frame, close the kettle body heating switch, and make the stretching kettle body (12) cool down. When the temperature drops to 80℃, open the stretching kettle body (12) to take out the stretching sample and cover the stretching kettle cover (13). The test is completed.

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