High-temperature molten salt environment fatigue testing device convenient to disassemble

Abstract

The application relates to a high-temperature molten salt environment fatigue test device convenient to disassemble and assemble, and relates to the technical field of material fatigue test, which comprises a heating furnace, a test kettle arranged in the heating furnace, a kettle cover which is detachably and fixedly connected to the test kettle, and a pull rod which is slidably arranged on the kettle cover, an upper clamp connected with the pull rod is arranged in the test kettle, a load-bearing frame which is detachably and fixedly connected to the kettle cover is arranged on the kettle cover, and a lower clamp is arranged on the load-bearing frame, the upper clamp and the lower clamp are respectively connected with two ends of a sample, an alloy tank is fixedly connected to the sample, and the alloy tank is used for containing molten salt. The application has the effects of reducing test cost, facilitating subsequent disassembly and assembly, and being beneficial to maintaining the service life of the clamp.

Description

Technical Field

[0001] This application relates to the field of materials fatigue testing technology, and in particular to a high-temperature molten salt environment fatigue testing device that is easy to disassemble and assemble. Background Technology

[0002] As a representative of fourth-generation nuclear energy technology, molten salt reactors demonstrate promising development prospects in terms of technological innovation, resource advantages, and global energy transition needs. Furthermore, the development of related technologies is crucial for the efficient utilization of nuclear energy and the optimization of the energy structure. Nickel-based superalloys, as manufacturing materials for core structural components and key functional parts of molten salt reactors, can withstand high-temperature conditions and resist molten salt corrosion, ensuring the safe and stable operation of the reactor. To verify the long-term reliability of nickel-based superalloys under extreme conditions and to avoid serious safety accidents such as leaks and explosions caused by material fatigue, fatigue testing of nickel-based superalloys in a high-temperature molten salt environment is typically required.

[0003] Currently, the conventional method for fatigue testing of nickel-based superalloys involves immersing the fixture and the nickel-based alloy sample entirely in a test vessel containing molten salt. To achieve the high-temperature molten salt environment, the test vessel containing the molten salt is heated in a furnace to reach the required high temperature for the test. Simultaneously, a tensile force is repeatedly applied to the sample by sliding a lever mounted on the vessel lid, thus conducting the fatigue test. This testing method can roughly simulate the actual working environment of nickel-based superalloys, thereby obtaining fatigue performance data of the sample under high-temperature molten salt conditions.

[0004] However, existing testing devices have significant drawbacks in actual experiments. Due to the high melting point of molten salt, typically above 500°C, and its extreme hardness after melting and solidification, the molten salt in the test vessel adheres very firmly to the fixture and sample after the high-temperature test. This makes disassembling the fixture and sample extremely difficult, hindering the observation of the experimental results and affecting the efficiency and analysis of the test results. Therefore, improvements are needed. Utility Model Content

[0005] To address the problem of difficulty in disassembling existing testing devices after high-temperature molten salt environment testing, this application provides a high-temperature molten salt environment fatigue testing device that is easy to disassemble and assemble.

[0006] This application provides a high-temperature molten salt environment fatigue testing device that is easy to assemble and disassemble, and adopts the following technical solution: A high-temperature molten salt environment fatigue testing device that is easy to assemble and disassemble includes a heating furnace, a test vessel disposed in the heating furnace, a vessel lid that is detachably and fixedly connected to the test vessel, and a pull rod that is slidably disposed on the vessel lid. The test vessel is provided with an upper clamp connected to the pull rod, a support frame that is detachably and fixedly connected to the vessel lid, and a lower clamp disposed on the support frame. The upper clamp and the lower clamp are respectively connected to both ends of the sample. An alloy container is fixedly connected to the sample and is used to hold molten salt.

[0007] By adopting the above technical solution, the test vessel is heated by a heating furnace to bring the molten salt to the high temperature required for the test. The pull rod is slidably mounted on the vessel lid, allowing repeated application of tensile force to the sample for fatigue testing. The upper clamp is connected to the pull rod and the sample, transmitting the tensile force of the pull rod. Meanwhile, the lower clamp is mounted on the support frame and connected to the sample, working together with the upper clamp to fix the sample for easy testing. The alloy container is used to hold the molten salt and is fixedly connected to the sample, effectively reducing the amount of molten salt used and lowering the test cost. It also prevents the clamp from contacting the molten salt, facilitating subsequent disassembly and assembly and helping to maintain the clamp's lifespan. After the test, the alloy container can be removed by machining to further analyze the fracture condition of the sample.

[0008] Preferably, the two ends of the upper clamp are threadedly connected to the pull rod and the sample, respectively.

[0009] By adopting the above technical solution, the two ends of the upper clamp are threadedly connected to the pull rod and the sample, which facilitates the installation and disassembly of the upper clamp, the pull rod, and the sample. This can improve the assembly and maintenance efficiency of the testing device, ensure the stability of the connection, and enable the tensile force to be effectively transmitted to the sample for fatigue testing.

[0010] Preferably, the support frame includes a support rod and a fixing block. At least two support rods are provided. One end of any support rod is detachably and fixedly connected to the vessel lid, and the other end of any support rod is detachably and fixedly connected to the fixing block. The lower clamp is provided on the fixing block.

[0011] By adopting the above technical solution, the load-bearing rod is used to connect the vessel lid and the fixing block. Setting at least two load-bearing rods can ensure the stability of the connection and the uniformity of the load. The load-bearing rod, vessel lid and fixing block are all set to be detachably fixed, which facilitates the assembly and disassembly of the device. The fixing block is used to install the lower clamp, providing an installation position for the lower clamp, so that the lower clamp can be stably fixed on the load-bearing frame, thereby achieving stable fixation of the sample.

[0012] Preferably, the lower clamp includes a connecting block and an abutting block. The connecting block passes through the fixing block and is threadedly connected to the sample. The abutting block is fixedly connected to the end of the connecting block away from the sample, and the abutting block and the side of the fixing block away from the sample form an abutting fit.

[0013] By adopting the above technical solution, the connecting block passes through the fixing block and is threadedly connected to the sample, which can achieve a stable connection between the lower clamp and the sample. The abutment block is fixed at the end of the connecting block away from the sample and forms an abutment fit with the side of the fixing block away from the sample. This can limit the connection block and prevent the sample from displacing when subjected to the tension of the tie rod. This ensures the structural stability of the entire testing device when performing fatigue testing on the sample, thereby ensuring the accuracy of the test results.

[0014] Preferably, the sample is provided with a boss, and the bottom of the alloy tank is provided with a welding hole with the same diameter as the boss.

[0015] By adopting the above technical solution, the boss on the sample is matched with the welding hole at the bottom of the alloy can, which makes it easy to accurately position the alloy can on the sample and facilitates subsequent welding of the two.

[0016] Preferably, the edge of the welding hole is chamfered, and the chamfer and the sidewall of the boss form a filling groove for filling solder.

[0017] By adopting the above technical solution, a chamfer is set at the edge of the welding hole to form a filling groove, which can better accommodate the solder, making the welding between the alloy can and the sample more secure, further ensuring the stability of the connection between the alloy can and the sample during the test, and making it easier to remove the alloy can by machining to analyze the fracture of the sample.

[0018] Preferably, any of the aforementioned support rods has a slot on its side wall to facilitate screwing and installing the support rod.

[0019] By adopting the above technical solution, a slot is opened on the side wall of the load-bearing rod, which makes it easier for workers to use tools to screw the load-bearing rod, thereby making it easier to carry out the detachable and fixed connection installation operation between the load-bearing rod and the vessel cover and the fixing block, and improving the assembly efficiency of the device.

[0020] Preferably, a bellows is sleeved on one end of the pull rod located outside the test vessel, one end of the bellows is connected to the pull rod, and the other end of the bellows is connected to the vessel lid.

[0021] By adopting the above technical solution, the bellows is sleeved on one end of the tie rod located outside the test vessel. One end of the bellows is connected to the tie rod, and the other end is connected to the vessel lid. This can play a sealing role, ensuring that the test vessel is in a vacuum test environment during the experiment. At the same time, the bellows can adapt to the sliding of the tie rod, ensuring the normal progress of the fatigue test.

[0022] In summary, this application includes at least one of the following beneficial technical effects: 1. Using an alloy container to hold molten salt and fix it to the sample can effectively reduce the amount of molten salt used and lower the test cost. At the same time, it ensures that the fixture does not come into contact with the molten salt, which is convenient for disassembly and assembly and helps to maintain the life of the fixture. After the test, the alloy container can be removed by machining to further analyze the fracture of the sample. 2. A boss is provided on the sample, and a welding hole with the same diameter as the boss is opened at the bottom of the alloy can, which makes it easy to accurately weld the alloy can onto the sample. At the same time, a chamfer is provided on the edge of the welding hole to form a filling groove, which can better accommodate the solder and make the weld between the alloy can and the sample more secure. 3. A bellows is sleeved at one end of the tie rod on the outside of the test vessel, and the two ends of the bellows are connected to the tie rod and the vessel lid respectively, which can play a sealing role to ensure that the test vessel is a vacuum test environment during the experiment. At the same time, the bellows can adapt to the sliding of the tie rod to ensure the normal progress of the fatigue test. Attached Figure Description

[0023] Figure 1 This is an isometric schematic diagram of the main overall structure in the embodiments of this application; Figure 2 This is a cross-sectional view of the main internal structure of the test vessel in the embodiments of this application; Figure 3 This is a partial isometric schematic diagram of the main load-bearing frame structure in the embodiments of this application.

[0024] Reference numerals: 1. Heating furnace; 2. Test vessel; 3. Vessel lid; 4. Tie rod; 41. Bellows; 5. Sample; 51. Boss; 6. Upper clamp; 7. Support frame; 71. Support rod; 711. Slot; 72. Fixing block; 73. Fixing nut; 8. Lower clamp; 81. Connecting block; 82. Abutment block; 9. Alloy container; 91. Welding hole; 92. Filling groove. Detailed Implementation

[0025] The following is in conjunction with the appendix Figure 1 -Appendix Figure 3 This application will be described in further detail.

[0026] This application discloses a high-temperature molten salt environment fatigue testing device that is easy to assemble and disassemble.

[0027] Reference Figure 1 , Figure 2 as well as Figure 3A high-temperature molten salt environment fatigue testing device that is easy to assemble and disassemble includes a heating furnace 1, a test vessel 2 embedded in the heating furnace 1, a vessel cover 3 detachably fixed to the test vessel 2 by bolts, and a pull rod 4 that is slidably disposed through the vessel cover 3. A corrugated pipe 41 is sleeved on one end of the pull rod 4 located outside the test vessel 2. One end of the corrugated pipe 41 is fixedly connected to the side wall of the pull rod 4 by welding, and the other end of the corrugated pipe 41 is detachably fixedly connected to the vessel cover 3 by bolts. Both ends of the pull rod 4 and the sample 5 are machined with external threads. The test vessel 2 is provided with an upper clamp 6 that is threadedly connected to the pull rod 4, a support frame 7 that is detachably fixedly connected to the vessel cover 3, and a lower clamp 8 disposed on the support frame 7. The upper clamp 6 and the lower clamp 8 are respectively threadedly connected to both ends of the sample 5. A nickel-based alloy container 9 is fixedly connected to the sample 5 by welding, and the alloy container 9 is used to hold molten salt.

[0028] In practical use, before placing the sample 5 into the test vessel 2, the staff needs to weld the high-temperature resistant alloy container 9 made of nickel-based alloy onto the sample 5 so that molten salt can be placed for the subsequent experiment. Then, the staff uses the upper clamp 6 to connect the two ends of the upper clamp 6 to the pull rod 4 and the sample 5 respectively to initially fix the sample 5. Then, the lower clamp 8 set on the support frame 7 is connected to the other end of the sample 5 to fix the sample 5 again, ensuring the stability of the sample 5 during the test. Subsequently, the staff puts the fixed sample 5 into the test vessel 2, and heats the molten salt in the alloy container 9 through the heating furnace 1 outside the test vessel 2, so that the molten salt reaches the high temperature state required for the test. At the same time, the pull rod 4 is used to repeatedly apply tensile force to the sample 5 for fatigue testing. Overall, this effectively reduces the amount of molten salt used, reduces the test cost, and also avoids the clamp from contacting the molten salt, which is convenient for subsequent disassembly and assembly and helps to maintain the clamp life. Among them, the end of the pull rod 4 located outside the test vessel 2 is sleeved with a bellows 41, and one end of the bellows 41 is connected to the pull rod 4 and the other end is connected to the vessel cover 3. This can play a sealing role without affecting the sliding of the pull rod 4, ensuring the normal progress of the fatigue test process, and ensuring that the test vessel 2 is a vacuum test environment during the experiment. The pull rod 4, the upper clamp 6, the lower clamp 8 and the sample 5 are all threaded, which facilitates the installation and disassembly of each component, improves the assembly and maintenance efficiency of the test device, and can also ensure the stability of the connection, so that the tensile force can be effectively transmitted to the sample 5 for fatigue testing.

[0029] Reference Figure 2 and Figure 3The support frame 7 includes support rods 71 ​​and fixing blocks 72. At least two support rods 71 ​​are provided. One end of any support rod 71 is detachably and fixedly connected to the vessel lid 3, and the other end of any support rod 71 is detachably and fixedly connected to the fixing block 72. In this embodiment, four support rods 71 ​​are provided, and the four support rods 71 ​​are arranged symmetrically about the sample 5 in pairs. Both ends of any support rod 71 are machined with external threads. One end of any support rod 71 is threadedly connected to the vessel lid 3, and the other end of any support rod 71 passes through the fixing block 72 and is threadedly connected to a fixing nut 73. The lower clamp 8 includes a connecting block 81 and an abutment block 82. The connecting block 81 passes through the fixing block 72 and is threadedly connected to the sample 5. The abutment block 82 is integrally formed and fixedly connected to the end of the connecting block 81 away from the sample 5, and the abutment block 82 and the side of the fixing block 72 away from the sample 5 form an abutment fit.

[0030] In practical use, the staff first symmetrically threaded the four support rods 71 ​​in the support frame 7 onto the vessel cover 3. The symmetrical arrangement of multiple support rods 71 ​​can ensure the stability of the connection and the uniformity of the load. After the support rods 71 ​​are installed, the staff puts the fixing block 72 on the other end of the support rod 71 and tightens it with the fixing nut 73 to complete the assembly of the support frame 7 and provide an installation position for the lower clamp 8. Then, the connecting block 81 of the lower clamp 8 is threaded through the fixing block 72 and threaded to the sample 5 to ensure that the sample 5 is tightly fixed to the lower clamp 8. At the same time, the abutment block 82 and the side of the fixing block 72 away from the sample 5 form an abutment, which plays a limiting role for the connecting block 81 and prevents the sample 5 from being displaced when subjected to the tension of the tie rod 4. This ensures that the entire testing device is structurally stable when the sample 5 is subjected to fatigue testing, thereby ensuring the accuracy of the test results.

[0031] Reference Figure 2 and Figure 3 Each of the support rods 71 ​​has a slot 711 on its side wall for easy screwing and installation of the support rod 71. In this embodiment, four slots 711 are arranged in a circumferential array along the support rod 71. In actual use, the slots 711 arranged in a circumferential array along the support rod 71 make it easier for workers to use tools to screw the support rod 71, thereby making it easier to install the support rod 71 with the vessel cover 3 and the fixing block 72, and improving the assembly efficiency of the device.

[0032] Reference Figure 2 and Figure 3 The side wall of the sample 5 is integrally formed with a ring-shaped boss 51, and the bottom of the alloy can 9 is provided with a welding hole 91 with the same diameter as the boss 51; the edge of the welding hole 91 is chamfered, and the chamfer and the side wall of the boss 51 form a filling groove 92 for filling solder.

[0033] In practical use, the staff first inserts the side of the sample 5 with the boss 51 into the welding hole 91 at the bottom of the alloy tank 9, so that the boss 51 and the welding hole 91 are initially matched. At this time, the filling groove 92 between the chamfer and the side wall of the boss 51 is clearly visible, which facilitates the subsequent welding of the two. Then, the staff fills the filling groove 92 with an appropriate amount of nickel-based alloy solder and heats and melts the solder in the filling groove 92 using a suitable welding process, so that the solder is fully fused with the side wall of the boss 51 and the edge of the welding hole 91. After the solder cools and solidifies, the sample 5 and the alloy tank 9 are firmly connected together by welding. This connection method not only ensures the sealing between the sample 5 and the alloy tank 9 and prevents the leakage of high-temperature molten salt, but also enhances the structural strength and stability of the entire testing device in the high-temperature molten salt environment.

[0034] The implementation principle of this application embodiment is as follows: First, a nickel-based alloy tank 9 for holding molten salt is welded onto a sample 5 with a boss 51. During welding, the welding hole 91 at the bottom of the alloy tank 9 is used to engage with the boss 51 for positioning. At the same time, the chamfer on the edge of the welding hole 91 and the side wall of the boss 51 form a filling groove 92. Welding material is filled into the filling groove 92 to ensure the sealing and stability of the connection between the two. Then, the pull rod 4 is connected to the upper clamp 6, the upper clamp 6 is connected to one end of the sample 5, and the lower clamp 8 is connected to the other end of the sample 5 through a threaded connection to facilitate subsequent fatigue testing. At the same time, the support frame 7 is threadedly connected to the lid 3 and the fixing block 72 through the support rod 71 with a slot 711 to provide stable support for the lower clamp 8. One end of the pull rod 4 located on the outside of the test vessel 2 is fitted with a bellows 41. The two ends of the bellows 41 are connected to the pull rod 4 and the vessel cover 3 respectively to achieve a seal, ensuring that the test vessel 2 is a vacuum environment. Finally, the heating furnace 1 heats the molten salt in the alloy tank 9 to the high temperature required for the test. The pull rod 4 is used to repeatedly apply tensile force to the sample 5 to carry out fatigue testing. The whole process reduces the amount of molten salt used, avoids the fixture from contacting the molten salt, and improves the disassembly and assembly efficiency of the device by means of threaded connection, ensuring the stability of the test process and the accuracy of the results.

[0035] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A high-temperature molten salt environment fatigue testing device that is easy to assemble and disassemble, characterized in that: The test vessel includes a heating furnace (1), a test vessel (2) installed inside the heating furnace (1), a vessel cover (3) detachably and fixedly connected to the test vessel (2), and a pull rod (4) slidably installed on the vessel cover (3). The test vessel (2) is provided with an upper clamp (6) connected to the pull rod (4), a support frame (7) detachably and fixedly connected to the vessel cover (3), and a lower clamp (8) installed on the support frame (7). The upper clamp (6) and the lower clamp (8) are respectively connected to both ends of the sample (5). An alloy container (9) is fixedly connected to the sample (5), and the alloy container (9) is used to hold molten salt.

2. The high-temperature molten salt environment fatigue testing device that is easy to assemble and disassemble according to claim 1, characterized in that: The two ends of the upper clamp (6) are threadedly connected to the pull rod (4) and the sample (5), respectively.

3. The high-temperature molten salt environment fatigue testing device that is easy to assemble and disassemble according to claim 1, characterized in that: The support frame (7) includes a support rod (71) and a fixing block (72). There are at least two support rods (71). One end of any support rod (71) is detachably and fixedly connected to the lid (3), and the other end of any support rod (71) is detachably and fixedly connected to the fixing block (72). The lower clamp (8) is set on the fixing block (72).

4. The high-temperature molten salt environment fatigue testing device that is easy to assemble and disassemble according to claim 3, characterized in that: The lower clamp (8) includes a connecting block (81) and an abutting block (82). The connecting block (81) passes through the fixing block (72) and is threadedly connected to the sample (5). The abutting block (82) is fixedly connected to the end of the connecting block (81) away from the sample (5), and the abutting block (82) and the side of the fixing block (72) away from the sample (5) form an abutting fit.

5. The high-temperature molten salt environment fatigue testing device that is easy to assemble and disassemble according to claim 1, characterized in that: The sample (5) is provided with a boss (51), and the bottom of the alloy can (9) is provided with a welding hole (91) with the same diameter as the boss (51).

6. The high-temperature molten salt environment fatigue testing device that is easy to assemble and disassemble according to claim 5, characterized in that: The edge of the welding hole (91) is chamfered, and the chamfer and the side wall of the boss (51) form a filling groove (92) for filling solder.

7. The high-temperature molten salt environment fatigue testing device that is easy to assemble and disassemble according to claim 3, characterized in that: The side wall of any of the load-bearing rods (71) is provided with a slot (711) to facilitate the screwing and installation of the load-bearing rod (71).

8. The high-temperature molten salt environment fatigue testing device that is easy to assemble and disassemble according to claim 1, characterized in that: The pull rod (4) is fitted with a bellows (41) on one end outside the test vessel (2). One end of the bellows (41) is connected to the pull rod (4), and the other end of the bellows (41) is connected to the vessel cover (3).

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