Auxiliary device for testing low temperature mechanical properties of materials

Abstract

The present invention provides an auxiliary device for testing the low-temperature mechanical properties of materials, comprising: a cylinder, a vacuum interlayer is formed between the inner wall and the outer wall of the cylinder, the cylinder is filled with a cryogenic liquid, a clamping arm of a material testing machine, a mechanical support of the material testing machine and a sample are arranged in the cylinder; an observation window assembly is installed in the cylinder to observe the low-temperature mechanical properties test process of the sample in the cylinder. The auxiliary device for testing the low-temperature mechanical properties of materials provided by the present invention realizes the visualization of the low-temperature mechanical properties test process of materials by setting the observation window assembly; at the same time, the auxiliary device for testing the low-temperature mechanical properties of materials provided by the present invention can realize the visualization of the low-temperature mechanical properties test process of materials in different low-temperature zones by using different cryogenic working fluids, and provide technical support for the evaluation of mechanical properties of materials in low-temperature environments, the study of material damage processes and the optimization and control of material processes.

Description

Technical Field

[0001] The invention relates to the technical field of material mechanical property testing, and in particular to an auxiliary device for low-temperature mechanical property testing of materials. Background Art

[0002] With the development of my country's aerospace, nuclear fusion energy, hydrogen energy, applied superconductivity, gas industry and some large scientific projects, more and more projects involve cryogenic engineering. The demand for cryogenic materials in these fields is increasing, and the performance data requirements for cryogenic materials are becoming more and more comprehensive.

[0003] Cryogenic materials refer to metals and their alloys suitable for use at temperatures below zero to absolute zero. When materials work in a low-temperature environment, their various mechanical properties are very different from those in a normal temperature environment. Among them, the mechanical properties of materials are an important performance indicator of materials or workpieces in engineering. Testing the mechanical properties of materials at low temperatures is of great significance to the research and optimization of low-temperature properties of materials, and is also crucial to the design and safe use of low-temperature components.

[0004] At present, the commonly used low-temperature environment is mostly obtained by refrigerating with liquid nitrogen (-196℃). The cryogenic mechanical bracket and the sample to be tested are immersed in a liquid nitrogen test device for testing to obtain the various cryogenic mechanical performance indicators of the material. However, the existing test device is made of low-temperature stainless steel material, and the change process of the material test, such as deformation, delamination, damage expansion, etc., cannot be directly observed during the test, which hinders further research on the low-temperature performance of the material. Summary of the invention

[0005] The present invention provides an auxiliary device for testing the low-temperature mechanical properties of materials, which is used to solve the defect that the testing device in the prior art cannot directly observe the test change process of the mechanical properties of the materials.

[0006] The present invention provides an auxiliary device for testing the low-temperature mechanical properties of materials, comprising: a cylinder, a vacuum interlayer is formed between the inner wall and the outer wall of the cylinder, the cylinder is filled with low-temperature liquid, a clamping arm of a material testing machine, a mechanical support of the material testing machine and a sample are arranged in the cylinder; an observation window assembly is installed in the cylinder to observe the low-temperature mechanical properties test process of the sample in the cylinder.

[0007] According to an auxiliary device for testing the low-temperature mechanical properties of materials provided by the present invention, the cylinder body includes: an inner cylinder filled with the low-temperature liquid; an outer cylinder sleeved on the outside of the inner cylinder; a sealing flange, wherein the sealing flange cover is arranged on the top of the inner cylinder and the outer cylinder to form a closed space between the inner cylinder and the outer cylinder; wherein a through hole is formed at the center of the sealing flange, and the through hole matches the size of the inner cylinder to form an open opening of the inner cylinder.

[0008] According to an auxiliary device for testing the low-temperature mechanical properties of materials provided by the present invention, the observation window assembly includes: a first observation window assembly, installed on the outer wall of the inner tube; a second observation window assembly, installed on the outer wall of the outer tube and coaxially arranged with the first observation window assembly.

[0009] According to an auxiliary device for testing the low-temperature mechanical properties of materials provided by the present invention, the first observation window assembly includes: a first cylinder body, installed on the outer wall of the inner cylinder; a first quartz glass, sealed and installed in the first cylinder body; wherein the first cylinder body is a Kovar alloy first cylinder body, or the first cylinder body and the first quartz glass are sealed and connected via a Kovar alloy layer.

[0010] According to an auxiliary device for testing low-temperature mechanical properties of materials provided by the present invention, the second observation window assembly includes: a second cylinder, installed on the outer wall of the outer cylinder and coaxially arranged with the first cylinder; and a second quartz glass, sealed and installed in the second cylinder.

[0011] According to an auxiliary device for testing the low-temperature mechanical properties of materials provided by the present invention, the second observation window assembly includes: a third cylinder, installed on the outer wall of the outer cylinder and coaxially arranged with the first cylinder; a free flange, connected to the third cylinder; and a third quartz glass, arranged in the free flange.

[0012] According to an auxiliary device for testing the low-temperature mechanical properties of materials provided by the present invention, the auxiliary device further includes a plurality of sealing rings, a first sealing groove is formed on the side wall of the third cylinder, a second sealing groove is formed on the side wall of the free flange, and the plurality of sealing rings are respectively arranged in the first sealing groove and the second sealing groove, and are respectively in contact with two side surfaces of the third quartz glass.

[0013] An auxiliary device for testing the low-temperature mechanical properties of materials provided by the present invention also includes a vacuum sealing outlet arranged on the outer wall of the outer cylinder.

[0014] According to the present invention, an auxiliary device for testing the low-temperature mechanical properties of materials also includes: a recovery channel, a first end of which is connected to the inner tube and a second end extends to the outside of the outer tube; and a low-temperature valve arranged at the second end of the recovery channel.

[0015] An auxiliary device for testing the low-temperature mechanical properties of materials provided by the present invention also includes a high-vacuum multi-layer thermal insulation material for a cryogenic container, and the high-vacuum multi-layer thermal insulation material for a cryogenic container is coated on the outer wall and bottom surface of the inner cylinder.

[0016] The auxiliary device for testing the low-temperature mechanical properties of materials provided by the present invention realizes the visualization of the testing process of the low-temperature mechanical properties of materials by setting an observation window assembly; at the same time, the auxiliary device for testing the low-temperature mechanical properties of materials provided by the present invention can realize the visualization of the testing process of the low-temperature mechanical properties of materials in different low-temperature temperature zones by using different low-temperature working fluids, thereby providing technical support for the evaluation of the mechanical properties of materials under low-temperature environments, the study of material damage processes, and the optimization and control of material processes. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a structural schematic diagram of an auxiliary device for testing low-temperature mechanical properties of materials provided by the present invention;

[0019] Figure 2 yes Figure 1 A local enlarged view of the A shown in FIG.

[0020] Reference numerals:

[0021] 10: Inner cylinder; 11: Outer cylinder; 12: Sealing flange;

[0022] 13: vacuum sealing outlet; 14: recovery channel; 15: cryogenic valve;

[0023] 16: handle; 20: first cylinder; 21: first quartz glass;

[0024] 22: Kovar alloy layer; 30: third cylinder; 31: free flange;

[0025] 32: third quartz glass; 33: sealing ring. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] Combine the following Figure 1 The invention describes an auxiliary device for testing the low-temperature mechanical properties of materials.

[0028] The embodiment of the present invention provides an auxiliary device for testing the low-temperature mechanical properties of materials, comprising: a cylinder and an observation window assembly. A vacuum space is formed between the inner wall and the outer wall of the cylinder, and the cylinder is filled with a low-temperature liquid. The clamping arm of the material testing machine, the mechanical support of the material testing machine, and the sample are arranged in the cylinder to perform a low-temperature mechanical property test on the sample. The observation window assembly is installed on the outer wall of the cylinder to observe the low-temperature mechanical property test process of the sample.

[0029] Specifically, the interlayer formed between the inner wall and the outer wall of the cylinder is evacuated to form a sealed vacuum interlayer between the inner wall and the outer wall of the cylinder, which can effectively reduce heat leakage, reduce the evaporation of the cryogenic liquid in the cylinder, and provide a low-temperature environment for the low-temperature mechanical properties test of the material. Furthermore, the cryogenic liquid can be liquid nitrogen, liquid helium, or other cryogenic liquids. In one embodiment of the present invention, optionally, the cryogenic liquid is liquid nitrogen. Furthermore, in this embodiment, the low-temperature mechanical properties test of the material refers to the mechanical properties test of the material at -196°C.

[0030] Furthermore, the cylinder is made of low temperature steel, which can be used in low temperature environments, and its inner and outer surfaces are polished. Low temperature steel can also be called deep cold steel or ultra-low temperature steel, which refers to alloy steel suitable for temperatures below 0°C and can be used at -196°C. Optionally, the cylinder is made of 18-8 chromium-nickel stainless acid-resistant steel.

[0031] In the actual test process, the cylinder contains cryogenic liquids such as liquid nitrogen. When the cryogenic liquid in the cylinder is liquid nitrogen, the internal working environment temperature is -196℃. The clamping arms and mechanical brackets of mechanical testing machines of different sizes and types can move up and down in the cylinder. Before the test, the sample needs to be submerged in liquid nitrogen and cooled to the liquid nitrogen temperature (or according to the required temperature, the corresponding refrigerant is used to obtain the required low temperature environment). When the sample reaches the predetermined temperature and stabilizes, the universal material testing machine is turned on to carry out mechanical tests to apply tensile, compression, shear, bending, fatigue and other loads to the sample under liquid nitrogen immersion cooling. When there is insufficient liquid nitrogen in the cylinder, liquid nitrogen can be easily added through the opening above the cylinder. Liquid nitrogen is a colorless and transparent liquid, and light enters from the opening above the cylinder, which is convenient for visual observation. The camera or CCD high-speed camera is installed on the outside of the observation window assembly, and the deformation, stratification, damage and other behaviors of the material under the action of force in a low temperature environment can be observed, photographed, recorded and recorded through the observation window of the observation window assembly.

[0032] In one embodiment of the present invention, optionally, the observation window assembly includes a first observation window assembly and a second observation window assembly, the first observation window assembly is installed on the inner wall of the cylinder, and the second observation window assembly is coaxially arranged with the first observation window assembly and installed on the outer wall of the cylinder, and the process of low-temperature mechanical properties testing of the sample inside the cylinder can be observed through the second observation window assembly and the first observation window assembly.

[0033] Further, the observation window assembly includes a barrel flange and quartz glass. Optionally, the quartz glass is installed at one end of the barrel flange, and the other ends of the two barrel flanges are respectively installed on the inner wall and the outer wall of the barrel, and the two barrel flanges are coaxially arranged to observe the process of low-temperature mechanical property testing of the sample inside the barrel.

[0034] Further, in one embodiment of the present invention, optionally, the cylinder flange and the cylinder are sealed and connected by argon arc welding.

[0035] It can be understood that the auxiliary device for low-temperature mechanical properties testing of materials provided in the embodiment of the present invention can be equipped with a sealing cover on the top of the cylinder or a thermal insulation layer inside the cylinder to achieve visual observation, photography, video recording and recording of the low-temperature mechanical properties testing process of materials in different low-temperature temperature zones.

[0036] The auxiliary device for testing the low-temperature mechanical properties of materials provided in the embodiment of the present invention realizes the visualization of the low-temperature mechanical properties testing process of materials by setting an observation window assembly; at the same time, the auxiliary device for testing the low-temperature mechanical properties of materials provided in the embodiment of the present invention can realize the visualization of the low-temperature mechanical properties testing process of materials in different low-temperature temperature zones by using different low-temperature working fluids, providing technical support for the evaluation of the mechanical properties of materials under low-temperature environments, the study of material damage processes, and the optimization control of material processes.

[0037] like Figure 1 As shown, in one embodiment of the present invention, the cylinder includes: an inner cylinder 10, an outer cylinder 11 and a sealing flange 12. The inner cylinder 10 is filled with cryogenic liquid, and the material testing machine and the sample are arranged in the inner cylinder 10 so that the sample is in a low temperature environment. The outer cylinder 11 is sleeved on the outside of the inner cylinder 10, and there is a gap between the outer cylinder 11 and the inner cylinder 10. The sealing flange 12 is covered on the top of the inner cylinder 10 and the outer cylinder 11 to form a closed space between the inner cylinder 10 and the outer cylinder 11. Further, a through hole is formed in the center of the sealing flange 12, and the size of the through hole matches the size of the inner cylinder 10, so that the inner cylinder 10 is open. When the cryogenic liquid in the inner cylinder 10 is insufficient, the cryogenic liquid can be conveniently added through the opening above the inner cylinder 10. At the same time, light enters from the opening above the inner cylinder 10, which is convenient for visual observation.

[0038] Furthermore, in one embodiment of the present invention, the side wall of the inner cylinder 10 adopts a thin-wall structure, which can reduce heat leakage generated by heat conduction. Optionally, in one embodiment of the present invention, the wall thickness is 1.2 mm.

[0039] The auxiliary device for testing the low-temperature mechanical properties of materials provided by the embodiment of the present invention has an opening designed on the top of the inner cylinder, so that the internal space of the inner cylinder is relatively large, and various clamps of different mechanical testing machines can be set. Light can be irradiated into the low-temperature liquid through the opening, which solves the lighting problem during observation through the visualization window. At the same time, when the material is subjected to a low-temperature mechanical property test, if it is found that the low-temperature liquid is insufficient and the low-temperature environment temperature in the inner cylinder is higher than the set temperature, it is convenient to replenish the low-temperature liquid.

[0040] Furthermore, in one embodiment of the present invention, the auxiliary device for testing the low-temperature mechanical properties of materials also includes a vacuum sealing port 13 disposed on the outer wall of the outer cylinder 11 to evacuate the enclosed space between the inner cylinder 10 and the outer cylinder 11 .

[0041] Specifically, before the low-temperature mechanical properties test of the sample is performed, the vacuum sealing port 13 is first connected to the molecular pump unit, and the molecular pump unit is turned on. When the vacuum degree in the closed space between the inner cylinder 10 and the outer cylinder 11 reaches a high vacuum, that is, the vacuum degree is less than 10 -3 After Pa, the vacuum sealing outlet 13 is closed to form a sealed vacuum interlayer in the enclosed space between the inner tube 10 and the outer tube 11, which can effectively reduce heat leakage caused by air convection and reduce the evaporation of the cryogenic liquid in the inner tube 10, thus providing a low-temperature environment for the low-temperature mechanical properties test of the material.

[0042] Furthermore, in one embodiment of the present invention, optionally, activated carbon with adsorption properties can be placed in the vacuum interlayer to adsorb residual gas, maintain the vacuum degree of the vacuum interlayer for a longer period of time, and reduce air convection heat exchange.

[0043] Optionally, the outer surface of the side wall and the bottom of the inner tube 10 may be coated with a high vacuum multilayer thermal insulation material for a cryogenic container to further reduce radiation heat leakage and reduce the evaporation of the cryogenic liquid in the inner tube 10. Specifically, in the high vacuum interlayer space of the cryogenic container, an insulation method is formed by alternating the combination of spacer materials and reflective screens. The spacer materials include: glass fiber paper, glass fiber cloth, chemical fiber paper and synthetic fiber screen. The reflective screen includes: aluminum foil and aluminized polyester film. In one embodiment of the present invention, the high vacuum multilayer thermal insulation material for a cryogenic container can be any combination of the above spacer materials and reflective screens. Optionally, in one embodiment of the present invention, the number of layers of the high vacuum multilayer thermal insulation material for a cryogenic container is greater than 30 layers.

[0044] The auxiliary device for testing the low-temperature mechanical properties of materials provided by the embodiment of the present invention can reduce heat conduction by setting the side wall of the inner cylinder as a thin-wall structure; set activated carbon in the vacuum interlayer to reduce air convection heat exchange; polish the inner and outer surfaces of the inner cylinder and the outer cylinder and coat the outer surface of the inner cylinder with a high-vacuum multi-layer insulation material to reduce heat radiation, reduce heat leakage between the auxiliary device and the outside world, thereby reducing the evaporation of the cryogenic liquid and allowing the sample to be kept in a low-temperature environment for a long time.

[0045] like Figure 1 and Figure 2 As shown, in one embodiment of the present invention, the observation window assembly includes: a first observation window assembly and a second observation window assembly. The first observation window assembly is installed on the outer wall of the inner tube 10, and the second observation window assembly is installed on the outer wall of the outer tube 11 and is coaxially arranged with the first observation window assembly.

[0046] Specifically, the first observation window assembly includes: a first barrel 20 and a first quartz glass 21. The first barrel 20 is installed on the outer wall of the inner barrel 10, and the first quartz glass 21 is sealed and installed inside the first barrel 20.

[0047] Specifically, since the first observation window assembly is in direct contact with the cryogenic liquid, in this embodiment, the first observation window assembly is in direct contact with liquid nitrogen at a temperature of -196°C. Since the expansion coefficient of quartz glass at low temperatures is much smaller than that of stainless steel, when testing, if the material of the first cylinder 20 is selected as low-temperature stainless steel, the shrinkage amount is large when it is cold, and the quartz glass is easily crushed. Further, in one embodiment of the present invention, in order to prevent the first quartz glass 21 from being damaged when the first cylinder 20 shrinks when it is cold, the material of the first cylinder 20 can be Kovar alloy, that is, 4J29 alloy, whose thermal expansion coefficient is close to that of quartz glass, and has excellent welding performance and good low-temperature structural stability. The oxide film of the alloy is dense and can be well infiltrated by quartz glass, and has excellent sealing performance. It can be sealed and connected with the first quartz glass 21 to prevent liquid nitrogen leakage.

[0048] Optionally, in order to prevent the first quartz glass 21 from being damaged when the first cylinder 20 contracts when it is cold, a Kovar alloy layer 22 may be provided between the first cylinder 20 and the first quartz glass 21 for transition welding connection, thereby reducing the impact of the first cylinder 20 contracting when it is cold on the first quartz glass 21. Further, in this embodiment, the material of the first cylinder 20 may be low-temperature stainless steel.

[0049] Optionally, the second observation window assembly includes: a second cylinder and a second quartz glass. The second cylinder is installed on the outer wall of the outer cylinder 11 and is coaxially arranged with the first cylinder 20, and the second quartz glass is sealed and installed in the second cylinder. Specifically, the second cylinder and the second quartz glass can be connected together by matching sealing; or by pressure sealing, that is, the second cylinder and the second quartz glass are connected by Kovar alloy transition welding.

[0050] Optionally, the second observation window assembly includes: a third barrel 30, a free flange 31 and a third quartz glass 32. Specifically, the first end of the third barrel 30 is mounted on the outer wall of the outer barrel 11 and is coaxially arranged with the first barrel 20, a flange is formed at the second end of the third barrel 30, the outer surface of the flange is processed with threads, the inner surface of the first end of the free flange 31 is also processed with threads, and the flange of the third barrel 30 is threadedly connected to the first end of the free flange 31. The third quartz glass 32 is arranged at the second end of the free flange 31, so that the test process of the sample in the inner barrel 10 can be observed through the third quartz glass 32 and the first quartz glass 21.

[0051] Furthermore, in one embodiment of the present invention, the flange of the third cylinder 30 and the free flange 31 may also be connected by bolt connection.

[0052] Further, in one embodiment of the present invention, optionally, the first cylinder 20 and the inner cylinder 10 can be installed by argon arc welding; the second cylinder or the third cylinder 30 and the outer cylinder 11 can also be installed by argon arc welding.

[0053] Further, in one embodiment of the present invention, the auxiliary device for testing the low temperature mechanical properties of materials further includes a plurality of sealing rings 33, a first sealing groove is formed on the side of the third cylinder 30 in contact with the third quartz glass 32, a second sealing groove is formed on the side of the free flange 31 in contact with the third quartz glass 32, and a plurality of sealing rings 33 are respectively arranged in the first sealing groove and the second sealing groove, and are in contact with two side surfaces of the third quartz glass 32 to protect the third quartz glass 32 and prevent the free flange 31 from damaging the third quartz glass 32 when assembling with the flange of the third cylinder 30. At the same time, air is prevented from entering the vacuum interlayer from the second observation window assembly.

[0054] Specifically, in the actual installation process, the sealing ring 33 can be placed in the first sealing groove first, and then the third quartz glass 32 can be pressed onto the sealing ring 33, and then the free flange 31 and the flange of the third cylinder 30 are fastened. It can be understood that: before fastening, the sealing ring 33 is first placed in the second sealing groove of the free flange 31, and then the free flange 31 and the flange of the third cylinder 30 are fastened.

[0055] Further, in one embodiment of the present invention, optionally, the sealing ring 33 may be a polytetrafluoroethylene annular gasket or a rubber O-ring.

[0056] like Figure 1 As shown, in one embodiment of the present invention, the auxiliary device for testing the low-temperature mechanical properties of materials further includes: a recovery channel 14 and a low-temperature valve 15. Specifically, the first end of the recovery channel 14 is connected to the inner tube 10, and the second end extends to the outside of the outer tube 11. The low-temperature valve 15 is arranged at the second end of the recovery channel 14, and is used to recycle the low-temperature liquid in the inner tube 10 for reuse.

[0057] like Figure 1 As shown, in one embodiment of the present invention, the auxiliary device for testing the low-temperature mechanical properties of materials also includes a handle 16, which is installed on the outer wall of the outer cylinder 11 to facilitate the transfer of the auxiliary device to different types of mechanical testing machines to provide a low-temperature environment for testing the low-temperature mechanical properties of materials.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An auxiliary device for testing the low temperature mechanical properties of materials, characterized in that: include: A cylinder, wherein a vacuum interlayer is formed between the inner wall and the outer wall of the cylinder, the cylinder is filled with a cryogenic liquid, and a clamping arm of a material testing machine, a mechanical support of the material testing machine, and a sample are arranged in the cylinder; An observation window assembly is installed in the cylinder to observe the low-temperature mechanical properties test process of the sample in the cylinder; The cylinder body comprises: an inner cylinder filled with the cryogenic liquid; an outer cylinder sleeved on the outside of the inner cylinder; a sealing flange, the sealing flange cover being arranged on the top of the inner cylinder and the outer cylinder to form a closed space between the inner cylinder and the outer cylinder; wherein a through hole is formed at the center of the sealing flange, the through hole matches the size of the inner cylinder, so that the inner cylinder forms an opening, and the outer surface of the side wall and the bottom of the inner cylinder is covered with a multi-layer thermal insulation material composed of a spacer material and a reflective screen alternately combined, and the number of layers of the multi-layer thermal insulation material is greater than 30; The observation window assembly comprises: a first observation window assembly mounted on the outer wall of the inner tube; a second observation window assembly mounted on the outer wall of the outer tube and coaxially arranged with the first observation window assembly; The first observation window assembly includes: a first cylinder body, installed on the outer wall of the inner cylinder; and a first quartz glass, sealed and installed in the first cylinder body; wherein the first cylinder body is a Kovar alloy first cylinder body, or the first cylinder body and the first quartz glass are sealed and connected via a Kovar alloy layer.

2. The auxiliary device for testing the low temperature mechanical properties of materials according to claim 1, characterized in that: The second observation window assembly comprises: A second cylinder body is mounted on the outer wall of the outer cylinder and is coaxially arranged with the first cylinder body; The second quartz glass is sealed and installed in the second cylinder.

3. The auxiliary device for testing low temperature mechanical properties of materials according to claim 1, characterized in that: The second observation window assembly comprises: A third cylinder body is mounted on the outer wall of the outer cylinder and is coaxially arranged with the first cylinder body; A free flange connected to the third cylinder; The third quartz glass is arranged in the free flange.

4. The auxiliary device for testing the low temperature mechanical properties of materials according to claim 3, characterized in that: It also includes multiple sealing rings. A first sealing groove is formed on the side wall of the third cylinder, a second sealing groove is formed on the side wall of the free flange, and a plurality of sealing rings are respectively arranged in the first sealing groove and the second sealing groove and are respectively in contact with two side surfaces of the third quartz glass.

5. The auxiliary device for testing the low temperature mechanical properties of materials according to claim 1, characterized in that: It also includes a vacuum sealing outlet, which is arranged on the outer wall of the outer cylinder.

6. The auxiliary device for testing low temperature mechanical properties of materials according to claim 1, characterized in that: Also includes: A recovery channel, wherein a first end of the recovery channel is connected to the inner cylinder, and a second end of the recovery channel extends to the outside of the outer cylinder; A low temperature valve is arranged at the second end of the recovery channel.

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