Fatigue testing machine

Abstract

The embodiment of the invention relates to the technical field of testing the strength characteristic of a solid material by using mechanical stress, in particular to a fatigue testing machine, which is used for carrying out fatigue test on a test piece and comprises a test box, a plurality of loading assemblies, a heating assembly and a ventilation assembly, the test box is used for providing a test space for a test piece; the plurality of loading assemblies are arranged to provide test loading force for the test piece; the heating assembly is used for heating the test space, and the ventilation assembly is used for introducing test gas into the test space, so that a high-temperature and high-pressure test environment is formed in the test space. According to the fatigue testing machine provided by the embodiment of the invention, the sealed testing space is provided for the test piece through the testing box, and the temperature and pressure in the testing space are respectively adjusted through the heating assembly and the ventilation assembly, so that a high-temperature and high-pressure testing environment with specific testing gas can be formed in the testing space; therefore, the fatigue performance of the material in a high-temperature and high-pressure gas testing environment can be tested.

Description

Technical Field

[0001] This application relates to testing the strength properties of solid materials using mechanical stress, and particularly to a fatigue testing machine. Background Technology

[0002] This section is only intended to provide background information relevant to this application and does not necessarily constitute prior art.

[0003] In material fatigue testing, a biaxial fatigue testing machine is typically used to simulate loading operations on the material in order to test its fatigue performance, thereby providing effective data support for the safety of material applications.

[0004] Currently, there are still many limitations in using a biaxial fatigue testing machine to perform fatigue testing on materials. Summary of the Invention

[0005] A brief overview of this application is provided below to offer a basic understanding of certain aspects thereof. It should be understood that this overview is not an exhaustive summary of the application. It is not intended to identify key or essential parts of the application, nor is it intended to limit its scope. Its purpose is merely to present certain concepts in a simplified form as a prelude to the more detailed description that follows.

[0006] This application provides a fatigue testing machine for performing fatigue tests on test specimens. The testing machine includes: a test chamber, multiple loading components, a heating component, and a ventilation component. The test chamber is configured to provide a test space for the test specimen. The multiple loading components are configured to provide test loading forces to the test specimen. The heating component is configured to heat the test space, and the ventilation component is configured to introduce test gas into the test space to form a high-temperature and high-pressure test environment within the test space.

[0007] The fatigue testing machine provided in the embodiments of this application provides a sealed testing space for the specimen through a testing chamber. The temperature and pressure within the testing space are adjusted by heating and ventilation components, respectively, to create a high-temperature, high-pressure testing environment with specific test gases. This allows for the testing of the fatigue performance of materials under high-temperature, high-pressure gas conditions, making the test data more consistent with the fatigue performance of materials in real, harsh environments. This improves the accuracy of the test data and provides a reliable basis for the design, selection, and safety assessment of materials working in high-temperature, high-pressure, and corrosive gas environments, ensuring the safety of metal components in extreme environments.

[0008] These and other advantages of this application will become more apparent from the following detailed description of preferred embodiments in conjunction with the accompanying drawings. Attached Figure Description

[0009] To further illustrate the above and other advantages and features of this application, the specific embodiments of this application will be described in more detail below with reference to the accompanying drawings. The drawings, together with the following detailed description, are included in and form a part of this specification. Elements having the same function and structure are indicated by the same reference numerals. It should be understood that these drawings only depict typical examples of this application and should not be considered as limiting the scope of this application.

[0010] Figure 1 This is a schematic diagram of the structure of a fatigue testing machine according to an embodiment of this application;

[0011] Figure 2 This is a cross-sectional schematic diagram of a box body according to an embodiment of this application;

[0012] Figure 3 According to one embodiment of this application Figure 2 A magnified view of part A in the image;

[0013] Figure 4 According to one embodiment of this application Figure 2 A magnified view of part B in the image;

[0014] Figure 5 This is a schematic diagram of the structure of a locking assembly according to an embodiment of this application;

[0015] Figure 6 According to one embodiment of this application Figure 5 A magnified view of part D;

[0016] Figure 7 According to one embodiment of this application Figure 2 A magnified view of part C;

[0017] Figure 8 This is a top view of a locking groove according to an embodiment of the present application.

[0018] It should be noted that the accompanying drawings are not necessarily drawn to scale, but are shown only in a schematic manner without affecting the reader's understanding.

[0019] Explanation of reference numerals in the attached figures:

[0020] 1. Rack; 11. Base; 12. Portal frame;

[0021] 2. Test chamber; 20. Test space;

[0022] 21. Box body; 211. Loading channel; 212. First loading channel; 213. Second loading channel; 214. Insertion slot; 215. Locking slot; 2151. Inclined surface; 216. Opening; 2161. Peripheral wall forming the opening;

[0023] 22. Door; 220. Sealing assembly; 221. Operating component; 222. Locking component; 223. Sealing body; 224. Reset component; 225. Pressing component; 226. Elastic component; 227. Limiting component; 228. Sealing groove; 229. Door handle; 2210. Observation window; 2211. Door body;

[0024] 3. Loading component; 30. Loading part; 31. Loading body; 32. Hydraulic pipeline; 33. Loading mating part; 34. Loading connector; 341. Connecting body; 342. Positioning part; 343. Anti-loosening part; 3431. Connecting spring; 3432. Reset plate; 344. Mating channel; 3421. Threaded section;

[0025] 41. Heating element; 42. Intake assembly; 43. Exhaust assembly; 420. Intake channel; 430. Exhaust channel; 421. Guide and limiting vent; 4211. Vent hole; 4212. Channel; 422. Connector; 423. Sealing element; 424. Reset element; 425. Sealing ring; 426. Positioning cap;

[0026] 5. Specimen; 50. Specimen body; 51. Specimen mating part; 52. Positioning hole of the specimen mating part. Detailed Implementation

[0027] Exemplary embodiments of this application will be described below with reference to the accompanying drawings. For clarity and brevity, not all features of actual implementations are described in the specification. However, it should be understood that many implementation-specific decisions must be made in the development of any such actual embodiment to achieve the developer's specific goals, such as complying with constraints related to the system and business, and these constraints may vary depending on the implementation. Furthermore, it should be understood that while development work can be very complex and time-consuming, such development work is merely a routine task for those skilled in the art who benefit from the content of this application.

[0028] It should be noted that, unless otherwise defined, the technical or scientific terms used in this application shall have the ordinary meaning as understood by a person with ordinary skills in the field to which this application pertains.

[0029] In the description of the embodiments of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0030] It should also be noted that, in order to avoid obscuring this application with unnecessary details, only the equipment structure and / or processing steps closely related to the solution according to this application are shown in the accompanying drawings, while other details that are not closely related to this application are omitted.

[0031] Currently, some materials require operation in high-temperature, high-pressure gas environments. These environments significantly accelerate the corrosion of metallic materials, thereby shortening their service life. Therefore, it is necessary to test the fatigue performance of materials under high-temperature, high-pressure gas environments. However, existing biaxial fatigue testing machines can only perform tests under conventional conditions and cannot test the fatigue performance of materials in high-temperature, high-pressure gas environments.

[0032] Based on this, embodiments of this application provide a fatigue testing machine for testing the fatigue performance of materials in a high-temperature, high-pressure gas environment.

[0033] An embodiment of this application provides a fatigue testing machine for performing fatigue tests on test specimens. For example... Figure 1 and Figure 2 As shown, Figure 1 This is a schematic diagram of the structure of a fatigue testing machine according to an embodiment of this application; Figure 2 This is a cross-sectional schematic diagram of a test chamber according to an embodiment of this application. The testing machine may include: a test chamber 2, multiple loading components 3, a heating component, and a ventilation component; the test chamber 2 is configured to provide a test space 20 for the specimen 5; the multiple loading components 3 are configured to provide a test loading force to the specimen 5; the heating component is configured to heat the test space 20, and the ventilation component is configured to introduce test gas into the test space 20 to form a high-temperature and high-pressure test environment within the test space 20.

[0034] The fatigue testing machine provided in the embodiments of this application provides a sealed testing space 20 for the specimen 5 through the testing chamber 2. The temperature and pressure inside the testing space 20 are adjusted by the heating component and the ventilation component, respectively, so as to form a high temperature and high pressure testing environment and a specific testing gas in the testing space 20. This allows the fatigue performance of the material to be tested under the high temperature and high pressure gas testing environment, so that the test data is more consistent with the fatigue performance of the material under real harsh environment, thereby improving the accuracy of the test data. This provides a reliable basis for the design, selection and safety assessment of materials working in high temperature, high pressure and corrosive gas environment, and ensures the safety of metal components in extreme environment.

[0035] In some embodiments, the testing machine may include a frame 1 for supporting the test chamber 2. The frame 1 may include a base 11 and a portal frame 12 fixedly connected to the base 11. The test chamber 2 is fixedly mounted on the portal frame 12 by bolts or other means for easy loading and unloading. The base 11 may have a counterweight function and can be fixed to the ground by bolts or other means, providing a stable foundation for the test chamber 2 and ensuring the accuracy and reliability of the test.

[0036] In some embodiments, the number of loading components 3 is 4, and the 4 loading components 3 are arranged in a cross on the test chamber 2 to realize simultaneous loading of the specimen 5 in the biaxial direction, simulating a more complex stress state. In this case, the fatigue testing machine is a cross biaxial fatigue testing machine.

[0037] In some embodiments, the heating assembly may include a plurality of heating elements 41 disposed within the test chamber 2 to provide the high-temperature environment required for testing within the test chamber 2. The heating elements 41 may be electric heating elements. In some embodiments, the number of heating elements 41 is four, with each heating element 41 disposed between two loading components 3, thereby making the temperature within the test space 20 more uniform.

[0038] In some embodiments, the test chamber 2 may include: a chamber body 21, a door 22, and a locking assembly; the chamber body 21 has an opening 216, the door 22 is disposed on the chamber body 21 and is used to open or seal the opening 216 to form a test space 20 together with the chamber body 21, and the locking assembly is used to lock the door 22 to the chamber body 21.

[0039] In this embodiment, by setting the test box 2 to include a box body 21 and a box door 22, and locking it with a locking assembly, it is convenient to put the test specimen 5 in and out, and also provides a sealed test space 20.

[0040] like Figure 2 and Figure 3 As shown, Figure 3 According to one embodiment of this application Figure 2 A partial enlarged view of A; In some embodiments, the sidewall of the housing 21 forms multiple loading channels 211. Each loading component 3 may include a loading element 30 and two hydraulic lines 32. The loading element 30 passes through a corresponding loading channel 211 into the test space 20 and connects to the test piece 5. The hydraulic lines 32 are connected to the loading channel 211 for supplying hydraulic medium flow. The loading element 30 is configured to move along its extension direction as the hydraulic medium flows in the loading channel 211.

[0041] In this embodiment, the hydraulic medium flows in the loading channel 211 to drive the loading member 30 to move along its extension direction, thereby providing and adjusting the loading force on the specimen 5, which can improve the accuracy and stability of loading.

[0042] In some embodiments, four loading channels 211 corresponding to the loading components 3 are provided in the side wall of the housing 21. The hydraulic medium can be hydraulic oil.

[0043] In some embodiments, the loading element 30 may include a loading body 31, a loading mating element 33, and a loading connector 34. The loading body 31 enters the test space 20 through a corresponding loading channel 211. The loading mating element 33 and the loading connector 34 are connected to the loading body 31. The loading connector 34 is used to connect to the test piece 5. The loading mating element 33 is disposed in the loading channel 211 and divides the loading channel 211 into a first loading channel 212 and a second loading channel 213. The first loading channel 212 and the second loading channel 213 are respectively connected to a hydraulic pipeline 32. The pressure change of the hydraulic medium in the first loading channel 212 and the second loading channel 213 drives the loading mating element 33 to move, thereby driving the loading body 31 to move along its extension direction.

[0044] In this embodiment, the pressure difference between the first loading channel 212 and the second loading channel 213 on both sides of the loading mating part 33 can be adjusted according to the test design, thereby providing the specimen 5 with a loading force whose direction and magnitude can be changed, simulating different stress states of the material in actual use, and improving the realism of the simulation data.

[0045] In this embodiment, the loading connector 34 and the loading body 31 are configured to be detachably connected, so that test specimens 5 of different specifications can be tested to obtain more test data and improve the accuracy of the data. Thus, it provides a reliable basis for the design, selection and safety assessment of materials that work in high temperature, high pressure and corrosive gas environments.

[0046] like Figure 4 As shown, Figure 4 According to one embodiment of this application Figure 2 A partial enlarged view of section B; In some embodiments, the loading connector 34 may include: a connecting body 341, a positioning member 342, and an anti-loosening member 343; the connecting body 341 forms a connecting groove, and the specimen mating part 51 can enter the connecting groove along a first direction to mate with the connecting body 341; the positioning member 342 is threadedly connected to the connecting body 341 and enters the positioning hole 52 of the specimen mating part to position the specimen 5 and prevent the specimen 5 from disengaging from the connecting groove along the first direction; the anti-loosening member 343 is used to provide a pre-tightening force to the positioning member 342 to prevent the positioning member 342 from loosening. In such embodiments, since there is no rigid connection between the loading connector 34 and the specimen 5, it is beneficial to reduce the adverse effects on the fatigue performance test of the specimen 5 caused by the rigid connection between the loading member 30 and the specimen 5, thereby improving the test accuracy. This locking method facilitates the installation and removal of the specimen 5 and the loading member 30, thereby improving test efficiency and ensuring smooth test execution.

[0047] The first direction refers to the direction perpendicular to the direction of the applied force.

[0048] In some embodiments, such as Figure 2 and Figure 4 As shown, the specimen 5 may include a specimen body 50 with a cross-shaped structure and four specimen mating parts 51 connected to the four ends of the cross-shaped structure respectively. The specimen mating parts 51 form positioning holes 52 for the specimen mating parts.

[0049] In some embodiments, such as Figure 4 As shown, the connecting body 341 has a clearance hole for the positioning member 342 to pass through and a mating channel 344 located radially outside the clearance hole. The anti-loosening member 343 is disposed within the mating channel 344. The axial directions of the clearance hole and the mating channel 344 are perpendicular to the first direction.

[0050] The anti-loosening component 343 may include a reset plate 3432 and a connecting spring 3431. The reset plate 3432 is fixedly connected to the positioning component 342. The reset plate 3432 can slide axially within the mating channel 344. The connecting spring 3431 is disposed between the reset plate 3432 and the axial end wall of the mating channel 344 to provide a moving force to the reset plate 3432, so as to prevent the positioning component 342 from loosening and thus causing the test piece 5 to fall out of the connecting groove.

[0051] In some embodiments, the connecting spring 3431 is compressed within the mating channel 344, pushing the reset plate 3432 to move away from the positioning hole 52 of the test piece mating part. During the loading process of the test piece 5, the connecting spring 3431 can buffer the impact force of the connecting body 341 on the test piece 5, adjust the connection state, and avoid loosening of the connection or damage to the test piece 5 due to impact, thereby enhancing the stability and reliability of the connection.

[0052] Specifically, the positioning member 342 is provided with a threaded section 3421, which is adapted to the thread of the connecting body 341. By screwing the threaded section 3421 on the positioning member 342 into the connecting body 341, the positioning member 342 and the connecting body 341 are connected.

[0053] In some embodiments, such as Figure 5 and Figure 8 As shown, the housing 21 forms an insertion slot 214 and a locking slot 215 communicating with the insertion slot 214. The locking assembly may include an operating member 221 and a locking member 222. The locking member 222 is disposed on the operating member 221. The locking member 222 and the operating member 221 can enter the insertion slot 214. As the operating member 221 rotates, the locking member 222 can move from the insertion slot 214 into the locking slot 215. In this way, when the test space 20 is under high pressure, the door 22 will not be opened, ensuring the airtightness of the test chamber 2, thereby preventing the leakage of high temperature, high pressure, and corrosive gases during the test, ensuring the safety of the test personnel and the stability of the test environment.

[0054] In some embodiments, see Figure 8 The cross-sections of the insertion slot 214 and the locking slot 215 can be approximately fan-shaped, allowing the locking element 222 to rotate within the fan-shaped area. See also... Figure 5 The locking groove 215 can form an inclined surface 2151 on one side of the operating member 221. The locking member 222 also forms an inclined surface 2151 that matches this surface. The cooperation of the two inclined surfaces ensures that the locking member 222 and the locking groove 215 are tightly fitted, further enhancing the locking effect of the test box 2.

[0055] In some embodiments, the operating element 221 further includes a door handle 229 to facilitate rotation of the operating element 221.

[0056] In some embodiments, see Figure 1 The door 22 may include a door body 2211 and a sealing component 220 disposed on the door body 2211. The sealing component 220 is configured such that when the door body 2211 is closed, the sealing component 220 enters the opening 216 of the housing 21 and seals the peripheral wall 2161 that defines the opening. In this embodiment, when the door 22 is closed, the sealing component 220 is embedded in the opening 216 of the housing 21. Since the sealing component 220 enters the opening 216 of the housing 21 and seals the peripheral wall 2161 that defines the opening, even if the test space 20 is under high pressure, the sealing component 220 is not likely to lose its sealing function under the pressure in the test space 20.

[0057] In some embodiments, see Figure 6 The sealing assembly 220 may include: a sealing body 223, an elastic element 226, a pressing element 225, a resetting element 224, and a limiting element 227; the sealing body 223 is disposed on the door body 2211, and a sealing groove 228 is formed on the side of the sealing body 223 facing the peripheral wall 2161 that forms the opening; the elastic element 226 is disposed in the sealing groove 228; the pressing element 225 is configured to move towards the elastic element 226 under the action of pressure in the test space 20 to press the elastic element 226, thereby deforming the elastic element 226 and abutting against the peripheral wall 2161 that defines the opening; the resetting element 224 is used to provide a force to the pressing element 225 so that the pressing element 225 can move away from the elastic element 226 after the pressure in the test space 20 decreases; the limiting element 227 is configured to limit the distance that the pressing element 225 moves away from the elastic element 226.

[0058] In this embodiment, during testing, the air pressure inside the test space 20 is higher than the external pressure. The gas pushes the extruder 225 to compress the elastic element 226, causing the elastic element 226 to abut against the peripheral wall 2161 of the opening in the housing 21, thereby ensuring the sealing effect of the test space 20. Furthermore, the greater the pressure inside the test chamber 2, the greater the deformation of the elastic element 226, and the tighter the abutment between the elastic element 226 and the peripheral wall 2161 of the opening in the housing 21, resulting in better sealing of the test chamber 2. This helps maintain the high-temperature, high-pressure sealing environment inside the test space 20 during testing. The limiting element 227 prevents the extruder 225 from being ejected from the sealing groove 228 and detached from the sealing body 223 under the force of the resetting element 224 after the pressure inside the test space 20 decreases.

[0059] like Figure 6 As shown, the limiting member 227 can be set on the side of the sealing body 223 away from the door body 2211, that is, at the opening of the sealing groove 228.

[0060] In some embodiments, see Figure 2 The test chamber 2 also forms an air inlet channel 420 and an air outlet channel 430. The ventilation assembly includes an exhaust assembly 43 and an air inlet assembly 42. The air inlet assembly 42 is used to supply test gas to the test space 20 through the air inlet channel 420, and the exhaust assembly 43 is used to discharge the test gas in the test space 20 through the air outlet channel 430 after the test. The air inlet assembly 42 is configured to prevent gas in the test space 20 from leaking out through the air inlet channel 420. In this embodiment, different types of gas can be introduced into the air inlet assembly 42 according to the needs of the test environment. The gas enters the test space 20 through the air inlet channel 420 to form the environment required for the test and prevents gas in the test space 20 from leaking out through the air inlet channel 420.

[0061] During the test, the test environment can be adjusted by cooperating with the intake assembly 42 and the exhaust assembly 43, thereby improving the accuracy of the test.

[0062] The test gas can be one or more of carbon dioxide, nitrogen, or oxygen. The corrosiveness and pressure of the test environment can be adjusted by regulating the carbon dioxide content in the mixed gas.

[0063] In some embodiments, see Figure 7The intake assembly 42 includes: a guide limiting vent 421, a reset member 424, a connector 422, and a blocking member 423; the blocking member 423 is movably disposed within the test space 20, and is used to move away from the intake channel 420 under the action of gas pressure in the intake channel 420 to open the intake channel 420 and the test space 20, and to move towards the intake channel 420 under the action of pressure in the test space 20 and the action of the reset member 424 to block the intake channel 420; the connector 422 is used to connect with the blocking member 423; the guide limiting vent 421 is fixedly disposed within the intake channel 420, and is used to allow gas to flow and to guide and limit the connector 422.

[0064] When gas is introduced into the air intake assembly 42, the gas can pass through the guide limiting vent 421 and apply pressure to the sealing member 423, causing the sealing member 423 to leave the housing 21, thereby allowing the gas to enter the test space 20. After the air intake is completed, the pressure in the air intake channel 420 drops, and the pressure in the test space 20 is greater than the pressure in the air intake channel 420. Under the action of the gas pressure and the elastic force of the reset member 424, the connector 422 drives the sealing member 423 to move towards the air intake channel 420, sealing the air intake channel 420, realizing one-way gas flow, preventing gas backflow, ensuring the stability of the test environment, and thus avoiding gas leakage that could cause errors in the test results.

[0065] In some embodiments, such as Figure 7 As shown, the guide limiting vent 421 has multiple vent holes 4211 distributed on it for gas flow. When gas is introduced into the air intake assembly 42, the gas can pass through the vent holes 4211 distributed on the guide limiting vent 421 and move evenly toward the sealing member 423.

[0066] In some embodiments, the number of connectors 422 can be multiple, and the guide limiting vent 421 can form multiple channels 4212. Each connector 422 passes through one channel 4212 and connects to the sealing member 423, thereby guiding the movement of the connectors 422 and the sealing member 423 through the channels 4212, so that the sealing member 423 can block the air intake channel 420 when it resets. In some embodiments, the number of connectors 422 and channels 4212 can be two.

[0067] In some embodiments, such as Figure 7 As shown, the intake assembly 42 further includes: a positioning cap 426 disposed at the end of the connector 422 away from the sealing member 423; and a reset member 424 sleeved on the connector 422 and located between the positioning cap 426 and the guide limiting vent member 421, thereby preventing the reset member 424 from falling off the connector 422. The reset member 424 can be, for example, a compression spring.

[0068] In some embodiments, such as Figure 7 As shown, the intake assembly 42 also includes a sealing ring 425, which is disposed at the opening of the intake channel 420 facing the sealing member 423. When the sealing member 423 is reset and attached to the inner wall of the housing 21, it increases the sealing between the sealing member 423 and the outlet of the intake channel 420, avoids air leakage, and thus ensures the sealing within the test space 20.

[0069] In some embodiments, a transparent observation window 2210 is embedded in the door body 2211 to facilitate observation of the state of the specimen 5.

[0070] In some embodiments, the testing machine may also include multiple sensors, which are used to monitor parameters such as temperature, pressure, oxygen content, and carbon dioxide content within the test space 20 during the experiment, thereby improving the accuracy of the test parameters.

[0071] In some embodiments, the testing machine may also include a lighting lamp for illumination, disposed in the testing space 20, so as to more clearly observe the state of the specimen 5.

[0072] In some embodiments, the testing machine may further include a camera for recording the testing process.

[0073] Regarding the embodiments of this application, it should also be noted that, without conflict, the embodiments of this application and the features in the embodiments can be combined with each other to obtain new embodiments.

[0074] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. The scope of protection of this application shall be determined by the scope of the claims.

Claims

1. A fatigue testing machine for performing fatigue tests on specimens, characterized in that, The testing machine includes: Test chamber, multiple loading components, heating components, and ventilation components; The test chamber is configured to provide a test space for the specimen; The plurality of loading components are configured to provide test loading force to the specimen; The heating component is configured to heat the test space, and the ventilation component is configured to introduce test gas into the test space, so as to form a high-temperature and high-pressure test environment in the test space.

2. The fatigue testing machine according to claim 1, characterized in that, The test chamber includes: The enclosure, doors, and locking components; The enclosure has an opening, and the enclosure door is disposed on the enclosure for opening or sealing the opening to form the test space together with the enclosure. The locking assembly is used to lock the enclosure door to the enclosure.

3. The fatigue testing machine according to claim 2, characterized in that, Multiple loading channels are formed on the side wall of the housing. Each loading component includes a loading element and two hydraulic lines. The loading element passes through a corresponding loading channel into the test space and connects to the test specimen. The hydraulic lines are connected to the loading channel for the flow of hydraulic medium. The loading element is configured to move along its extension direction as the hydraulic medium flows in the loading channel.

4. The fatigue testing machine according to claim 3, characterized in that, The loading component includes a loading body, a loading mating component, and a loading connector; The loading body enters the test space through a corresponding loading channel. The loading fitting and the loading connector are connected to the loading body, and the loading connector is used to connect to the test piece. The loading fitting is disposed in the loading channel and divides the loading channel into a first loading channel and a second loading channel. The first loading channel and the second loading channel are respectively connected to a hydraulic pipeline. The pressure change of the hydraulic medium in the first loading channel and the second loading channel drives the loading fitting to move, thereby driving the loading body to move along its extension direction.

5. The fatigue testing machine according to claim 4, characterized in that, The loading connector includes: Connect the main body, positioning components, and anti-loosening components; The connecting body forms a connecting groove, and the mating part of the specimen can enter the connecting groove along the first direction to mate with the connecting body. The positioning member is threadedly connected to the connecting body and enters the positioning hole of the mating part of the specimen to position the specimen and prevent the specimen from dislodging from the connecting groove along the first direction. The anti-loosening component is used to provide pre-tightening force to the positioning component to prevent the positioning component from loosening.

6. The fatigue testing machine according to claim 2, characterized in that, The housing forms an insertion slot and a locking slot communicating with the insertion slot; The locking assembly includes an operating member and a locking member. The locking member is disposed on the operating member. The locking member and the operating member are capable of entering the insertion slot. As the operating member rotates, the locking member can move from the insertion slot into the locking slot.

7. The fatigue testing machine according to claim 2, characterized in that, The door includes a door body and a sealing assembly disposed on the door body. The sealing assembly is configured such that when the door body is closed, the sealing assembly enters the opening of the box and seals the peripheral wall that forms the opening.

8. The fatigue testing machine according to claim 7, characterized in that, The sealing assembly includes: Sealing body, elastic element, extrusion element, reset element, and limiting element; The sealing body is disposed on the door body, and a sealing groove is formed on the side of the sealing body facing the peripheral wall of the opening; The elastic element is disposed in the sealing groove, and the extrusion element is configured to move toward the elastic element under the action of pressure in the test space to extrude the elastic element, thereby causing the elastic element to deform and abut against the peripheral wall that defines the opening. A reset element is used to apply a force to the extrusion element so that the extrusion element can move away from the elastic element after the pressure is reduced in the test space. The limiting member is configured to limit the distance the extruder moves away from the elastic member.

9. The fatigue testing machine according to any one of claims 1-8, characterized in that, The test chamber also forms an air inlet channel and an air outlet channel; The ventilation assembly includes an exhaust assembly and an intake assembly. The intake assembly is used to provide test gas to the test space through the intake channel, and the exhaust assembly is used to discharge the test gas in the test space through the exhaust channel after the test is completed. The air intake assembly is configured to prevent gas in the test space from leaking out through the air intake channel.

10. The fatigue testing machine according to claim 9, characterized in that, The air intake assembly includes: Guide, limit, and ventilation components; reset components; connectors; and sealing components. The sealing component is movably disposed within the test space and is used to move away from the air intake channel under the action of gas pressure in the air intake channel to open the air intake channel and the test space, and to move towards the air intake channel under the action of pressure in the test space and the action of the reset component to block the air intake channel. The connector is used to connect with the sealing component; The guide and limiting vent is fixedly installed in the air inlet channel to allow gas to flow and to guide and limit the connection.

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