In-situ liquid nitrogen cold and hot table testing device

Abstract

The utility model discloses an in-situ liquid nitrogen cold and hot table testing device which comprises a contact table used for placing a sample; the heating unit at least partially penetrates through the contact table and comprises a heating piece; the cooling unit comprises a liquid nitrogen transmission pipeline assembly capable of being connected with a liquid nitrogen source, and at least part of the liquid nitrogen transmission pipeline assembly penetrates through the contact table; and the temperature measuring unit is used for detecting the heating temperature of the contact table by the heating unit or detecting the refrigerating temperature of the contact table by the cooling unit. The device is provided with the heating unit and the cooling unit at the same time, so that a sample can be heated and refrigerated, and phase change microscopic characterization observation of in-situ materials at different high and low temperatures required by an experiment is met; and the temperature measuring unit not only can detect the heating temperature of the heating unit, but also can detect the refrigeration temperature of the cooling unit, so that accurate temperature control refrigeration of the sample is realized, and the temperature control precision is high.

Description

Technical Field

[0001] The utility model belongs to the field of precision instruments, and particularly relates to an in-situ liquid nitrogen cold and hot stage testing device. Background Technique

[0002] Materials are the foundation of the development of various industries and the key elements of scientific and technological development and social progress. The research and development of materials are inseparable from the innovation of testing methods. At high and low temperatures, substances exhibit many new phenomena, new properties, and new laws. Exploring the reactions of materials at high and low temperatures is of great significance for new functional materials. Currently, there are many methods to obtain low temperatures in existing technologies, including phase change refrigeration, throttling cold effect, gas isentropic expansion refrigeration, adiabatic deflation refrigeration, vortex refrigeration, Peltier cold effect, radiation refrigeration, etc. However, limited to the field of electron microscopy, phase change refrigeration and Peltier cold effect are more suitable. Phase change refrigeration uses the endothermic effect during the phase change of the refrigerant to achieve refrigeration. Liquid nitrogen refrigeration uses the heat absorption during the gasification of the liquid, and its lowest refrigeration temperature can reach -190°C. The Peltier cold effect uses two different conductors connected into an electric couple and connected to a DC power supply. When current flows through the electric couple, an energy transfer phenomenon occurs. Heat is released at one joint and absorbed at the other joint to cool down. The refrigeration effect of this method is far from reaching the effect of liquid nitrogen refrigeration.

[0003] Currently, there are many methods to obtain high temperatures in existing technologies in electron microscopes, including electric heating heaters, resistive heaters, and laser heaters. Among them, the electric heating heater mainly heats the sample by applying a large current to the sample and converting electrical energy into heat energy when the current passes through the metal sample. This heating method has specific requirements for the sample material. Laser heating uses high-energy laser pulses to irradiate the surface of the workpiece, generating heat in the irradiated area, and then transferring the heat from the surface of the workpiece to the inside through heat diffusion, heat convection, heat conduction, etc. This heating method cannot be well coupled with liquid nitrogen refrigeration equipment due to its special requirements. Moreover, in the existing technology, the size of the laser spot for laser heating is a fixed value and cannot be adjusted to a suitable size according to the size of the area to be heated of the sample. The resistive heater used in our device is an indirect resistance heating method. It allows current to pass through the heating element and the heating wire to make the heating element heat up first, and then uses the heat generated by the heating element to heat the sample indirectly through heat conduction, heat convection, or heat radiation. This method is the most mature and widely used heating method in electron microscopes at present. Using this method, uniform heating of samples with specified sizes can be achieved.

[0004] The high and low temperature test of new materials is one of the necessary steps in the development of new materials and product design. It can evaluate the performance and lifespan of materials under simulated real working conditions, verify the reliability and stability of products. Especially for materials applied in complex environments such as the actively developed high-tech fields and new energy fields, for metal materials, significant changes often occur in low temperature environments. Low temperature mainly affects the brittleness and toughness of metal materials. It can comprehensively apply the brittle fracture characteristics of metal materials, which is also very meaningful for the test and evaluation of some electronic components and new energy battery materials. Utility Model Content

[0005] In order to overcome the deficiencies of the prior art, the present utility model provides an in-situ liquid nitrogen heating and cooling stage testing device, which has a heating unit and a cooling unit. It can not only heat the sample but also cool the sample, meeting the requirements of in-situ material phase change microscopic characterization observation at different high and low temperatures in experiments, and providing a testing method for revealing the thermal environment of materials at the micro-nano scale.

[0006] The technical solution adopted by the present utility model to solve its technical problems is: an in-situ liquid nitrogen heating and cooling stage testing device, including:

[0007] A contact stage for placing the sample;

[0008] A heating unit, at least partially passing through the contact stage, which includes a heating element;

[0009] A cooling unit, including a liquid nitrogen transmission pipeline assembly that can be connected to a liquid nitrogen source, and at least part of the liquid nitrogen transmission pipeline assembly passes through the contact stage;

[0010] A temperature measurement unit for detecting the heating temperature of the heating unit on the contact stage or detecting the cooling temperature of the cooling unit on the contact stage.

[0011] The present utility model has both a heating unit and a cooling unit. It can not only heat the sample but also cool the sample, meeting the requirements of in-situ material phase change microscopic characterization observation at different high and low temperatures in experiments; and the temperature measurement unit can not only detect the heating temperature of the heating unit but also detect the cooling temperature of the cooling unit, realizing precise temperature control and cooling of the sample with high temperature control accuracy.

[0012] Further, the liquid nitrogen transmission pipeline assembly includes a first section body passing through the contact stage, and a second section body and a third section body located on both sides of the first section body. The first section body, the second section body, and the third section body are connected and communicate with each other, and the second section body and the third section body respectively form a liquid nitrogen inlet and a liquid nitrogen outlet. The first section body, the second section body, and the third section body form a complete liquid nitrogen transmission pipeline, enabling liquid nitrogen to pass through the contact stage during transmission, playing a role in cooling the contact stage, and thus realizing the cooling function of the sample.

[0013] Furthermore, the second body segment and / or the third body segment include a metal tube body and a corrugated tube body, and a swivel joint is connected to the end of the corrugated tube body. The metal tube body can be used to transport liquid nitrogen. The corrugated tube body has a large contact area with air. During the heating process of the heating unit, heat exchange occurs with the air, thereby achieving a good heat dissipation effect and preventing the hose connected to the swivel joint from being heated and failing due to heat transfer during the heating process, which affects the transmission of liquid nitrogen.

[0014] Furthermore, the second body segment and / or the third body segment are in an L shape. Limited by the internal space of the scanning electron microscope cavity, the L-shaped design can improve the space utilization rate, reduce the overall height of the device, make the overall structure compact, and have a reasonable space layout.

[0015] Furthermore, the swivel joint at the liquid nitrogen outlet is connected to a micro air pump through a hose. The operation of the micro air pump realizes the function of extracting liquid nitrogen from the liquid nitrogen source.

[0016] Furthermore, the heating unit further includes a housing, the heating element is a heating wire, which is arranged inside the housing; the temperature measuring unit is a thermocouple wire, which is arranged inside the housing of the heating unit. Fixing the heating wire and the thermocouple wire together improves the stability and repeatability of temperature measurement.

[0017] Furthermore, the contact table forms a limiting card slot, the housing is a metal housing, and the metal housing is arranged in the limiting card slot. The pressing block is detachably connected to the contact table to fixedly assemble the metal housing. Fixing the heating unit and the cooling unit together, the temperature measuring unit can not only detect the heating temperature of the heating wire, but also detect the cooling temperature of the liquid nitrogen transmission pipeline assembly during the liquid nitrogen extraction process, realizing precise temperature control and refrigeration of the sample with high temperature control accuracy.

[0018] Furthermore, it further includes a fixed bottom plate and a vertical seat connected to the fixed bottom plate. The contact table is connected to the vertical seat so that the contact table and a part of the liquid nitrogen transmission pipeline assembly are suspended. The suspended structure provides a accommodating space for the L-shaped structure of the second body segment and the third body segment, facilitating the erection of the liquid nitrogen transmission pipeline; it also enables the heating unit and the cooling unit to have a certain distance from the scanning electron microscope instrument, avoiding damage to the instrument due to obvious temperature changes during the heating or refrigeration process.

[0019] The beneficial effects of the present utility model are as follows: 1) The device has both a heating unit and a cooling unit, which can not only heat the sample but also cool the sample, meeting the in-situ material phase transition microscopic characterization observations at different high and low temperatures required by experiments; 2) The heating unit and the cooling unit are fixed together by a pressing block, and the temperature measuring unit is placed inside the heating unit, ensuring that the temperature measuring unit can not only detect the heating temperature of the heating wire but also detect the cooling temperature of the liquid nitrogen transmission pipeline assembly during liquid nitrogen extraction, realizing precise temperature control and cooling of the sample with high temperature control accuracy; 3) The heating or cooling is carried out by means of electric heating and liquid nitrogen cooling, which can provide a relatively wide temperature range, with a fast temperature change speed and high efficiency; 4) The overall structure of the device is compact, small in size and light in weight, reserving an installation space for assembling related equipment for tests with special environmental requirements for samples, and can be used in combination with current mainstream scanning electron microscopes, Raman spectrometers with open sample platforms, X-ray diffractometers and various optical microscopic imaging systems, with strong practicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 FIG. is a schematic structural diagram of an in-situ liquid nitrogen heating and cooling stage testing device provided by the present utility model Figure I 。

[0021] Figure 2 FIG. is a schematic structural diagram of an in-situ liquid nitrogen heating and cooling stage testing device provided by the present utility model Figure II 。

[0022] Figure 3 FIG. is a top view of the in-situ liquid nitrogen heating and cooling stage testing device provided by the present utility model.

[0023] Figure 4 is Figure 3 the sectional view taken along line A-A in

[0024] Figure 5 is Figure 3 the sectional view taken along line C-C in

[0025] Figure 6 FIG. is a schematic diagram of a partial structure of the in-situ liquid nitrogen heating and cooling stage testing device provided by the present utility model.

[0026] Figure 7 FIG. is a sectional view of the heating unit and the temperature measuring unit in the present utility model.

[0027] Figure 8 FIG. is a schematic diagram of the structure of the entire liquid nitrogen transmission pipeline.

[0028] Among them, 1 - contact stage, 11 - sample, 12 - limit card slot, 2 - heating unit, 21 - heating element, 22 - housing, 3 - cooling unit, 31 - liquid nitrogen transmission pipeline assembly, 311 - first section body, 312 - second section body, 3121 - metal pipe body, 3122 - bellows body, 313 - third section body, 314 - adapter, 32 - liquid nitrogen source, 4 - temperature measurement unit, 5 - pressure block, 6 - fixed bottom plate, 7 - vertical seat, 8 - hose, 9 - micro air pump. Detailed implementation manner

[0029] In order to enable those skilled in the art to better understand the solution of the present utility model, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0030] As Figures 1 - 7 shown, an in-situ liquid nitrogen cold-hot stage testing device includes a contact stage 1, a heating unit 2, a cooling unit 3 and a temperature measurement unit 4.

[0031] The contact stage 1 includes a contact stage main body and a square platform located on the upper surface of the contact stage main body. The square platform can be used to place the sample 11. The contact stage main body and the square platform can be integrally provided or separately provided;

[0032] A part of the heating unit 2 passes through the contact stage 1 for heating the sample 11. The heating unit 2 includes a heating element 21. When an electric current passes through the heating element 21, the heating element 21 generates heat, and then the heat generated by the heating element 21 is conducted to the sample 11 through the contact stage 1 in an indirect manner of heat conduction, heat convection or heat radiation to achieve uniform heating of the sample 11.

[0033] The cooling unit 3 includes a liquid nitrogen transmission pipeline assembly 31 that can be connected to a liquid nitrogen source 32. At least a part of the liquid nitrogen transmission pipeline assembly 31 passes through the contact stage 1. Liquid nitrogen reaches the contact stage 1 through the liquid nitrogen transmission pipeline assembly 31. The liquid nitrogen vaporizes to reduce the temperature of the contact stage 1, and the temperature of the sample 11 on the surface of the contact stage 1 is reduced through temperature conduction to achieve the refrigeration function of the sample 11.

[0034] The temperature measurement unit 4 is used to detect the heating temperature of the heating unit 2 on the contact stage 1 or the refrigeration temperature of the cooling unit 3 on the contact stage 1.

[0035] The utility model simultaneously has a heating unit 2 and a cooling unit 3, which can not only heat the sample 11, but also cool the sample 11, meeting the in-situ material phase transition microscopic characterization observations at different high and low temperatures required by experiments; and the temperature measurement unit 4 can not only detect the heating temperature of the heating unit 2, but also detect the cooling temperature of the cooling unit 3, realizing precise temperature control and cooling of the sample 11 with high temperature control accuracy.

[0036] As Figures 1 - 8 shown, the liquid nitrogen transmission pipeline assembly 31 includes a first section 311 passing through the contact table 1, a second section 312 and a third section 313 located on both sides of the first section 311. The first section 311, the second section 312 and the third section 313 are connected and communicate with each other. The second section 312 and the third section 313 respectively form a liquid nitrogen inlet and a liquid nitrogen outlet. Liquid nitrogen enters from the second section 312, passes through the first section 311 and the third section 313, and is discharged from the end of the third section 313. Of course, in other embodiments, liquid nitrogen can also enter from the third section 313 and be discharged from the second section 312. The exchange of the liquid nitrogen inlet and outlet does not affect the cooling effect on the sample 11.

[0037] Furthermore, adapters 314 are connected to the ends of the second section 312 and the third section 313. The adapter 314 at the liquid nitrogen inlet is connected to the liquid nitrogen source 32 through a hose 8, and the adapter 314 at the liquid nitrogen outlet is connected to a micro air pump 9 through a hose 8, forming a complete liquid nitrogen transmission path of "liquid nitrogen source 32 - hose 8 - liquid nitrogen transmission pipeline assembly 31 - hose 8 - micro air pump 9" to realize the function of liquid nitrogen extraction and cooling. Specifically, as Figure 8 shown, the micro air pump 9 operates to extract liquid nitrogen from the liquid nitrogen source 32. The liquid nitrogen passes through the hose 8, enters the liquid nitrogen transmission pipeline assembly 31 through the liquid nitrogen inlet, and is finally pumped out from the liquid nitrogen outlet by the micro air pump 9. The liquid nitrogen vaporizes during the transmission process, reducing the temperature of the contact table 1, and thus reducing the temperature of the sample 11 placed on the surface of the contact table 1 through heat conduction. The micro air pump 9 also has its own suitable temperature range for operation. At this time, it is necessary to appropriately increase the length of the hose 8 to ensure heat exchange between the liquid nitrogen transmission process and the environment, and the liquid nitrogen vaporizes into nitrogen with a lower temperature to realize the normal operation of the micro air pump 9. Of course, the liquid nitrogen tank 32 and the micro air pump 9 are existing structures and can be realized through existing technologies. In this embodiment, the adapter 314 is a metal bellows joint.

[0038] As Figure 4 shown, the first section 311 passes through the contact table 1 and is formed by the through groove of the contact table 1 itself. When liquid nitrogen is transmitted, it directly touches the contact table 1, resulting in a better and faster cooling effect; in other embodiments, the first section 311 can be a metal pipe passing through the inside of the contact table 1, with both ends connected to the second section 312 and the third section 313, which can also complete the transmission of liquid nitrogen, and no limitation is made here.

[0039] Further, the first body 311 is U-shaped. Taking the direction shown as an example, at least a part of the second body 312 and the third body 313 extends into the contact stage 1 from below the contact stage 1 to form a U-shaped channel, increasing the channel length, so that the liquid nitrogen stays in the transmission channel for a longer time, extending the cooling time of the sample. Of course, in other embodiments, the first body 311 is linear. At this time, parts of the second body 312 and the third body 313 extend into the contact stage 1 from the left and right sides of the contact stage 1 respectively, removing the pipelines of the second body 312, the third body 313 and the first body 311 in the vertical direction, shortening the liquid nitrogen transmission path, and the liquid nitrogen can reach the contact stage 1 more quickly, thereby improving the refrigeration efficiency. Figure 4 As shown in the figure, the second body 312 and the third body 313 include a metal tube body 3121 and a corrugated tube body 3122. The metal tube body 3121 is used to transmit liquid nitrogen; the surface of the corrugated tube body 3122 is corrugated, with a large contact area with air. During the heating process of the heating unit 2, heat exchange is carried out with air to achieve a good heat dissipation effect, preventing the hose 8 connected to the adapter 314 from being heated and failing due to heat transfer during the heating process, affecting the transmission of liquid nitrogen.

[0040] For example, Figure 1 As shown, the second body 312 and the third body 313 are L-shaped. Limited by the internal space of the scanning electron microscope cavity, the L-shaped design can improve the space utilization rate, reduce the overall height of the equipment, with a compact overall structure and a reasonable space layout. Of course, in other embodiments, the second body 312 and the third body 313 are linear and directly extend into the contact stage 1 from the right side of the contact stage 1, with a simpler structure and being convenient for processing.

[0041] Further, taking the direction shown as an example, Figure 5 As shown, the heating unit 2 further includes a housing 22. The heating element 21 is a nickel-chromium heating wire, and the heating wire is arranged inside the housing 22. The temperature measuring unit 4 is a thermocouple wire, which is arranged inside the housing 22 of the heating unit 2. In this embodiment, the outermost housing 22 of the heating unit 2 is a metal housing 22, which is filled with magnesium oxide powder inside to fix the heating wire and the thermocouple wire together, improving the stability and repeatability of temperature measurement.

[0042] For example, Figure 7 As shown, the contact stage 1 forms a limiting card slot 12. Specifically, the limiting card slot 12 is formed by the upper surface of the contact stage main body and the lower surface of the square platform. The metal housing 22 is arranged in the limiting card slot 12, and the width of the metal housing 22 is adapted to the width of the limiting card slot 12.

[0043] For example, Figures 4 - 6 As shown, the contact stage 1 forms a limiting card slot 12. Specifically, the limiting card slot 12 is formed by the upper surface of the contact stage main body and the lower surface of the square platform. The metal housing 22 is arranged in the limiting card slot 12, and the width of the metal housing 22 is adapted to the width of the limiting card slot 12.

[0044] The briquette 5 is tightly fixed to the contact table 1 through nuts. The two ends of the metal shell 22 are respectively pressed downward by the briquette 5, realizing the fixed assembly of the metal shell 22 and preventing the metal shell 22 from slipping out of the limit card slot 12. At the same time, it also fixes the heating unit 2 and the cooling unit 3 together, and the temperature measuring unit 4 is placed inside the heating unit 2, ensuring that the temperature measuring unit 4 can not only detect the heating temperature of the heating wire, but also detect the cooling temperature of the liquid nitrogen transmission pipeline assembly 31 during the liquid nitrogen extraction process. Further, taking Figure 4 the direction shown as an example, the limit card slot 12 runs through the inside of the contact table 1 in the front-back direction, while the first section body 311 runs through the contact table 1 in the left-right direction. The limit card slot 12 is located above the first section body 311 with a certain distance, and does not interfere with the first section body 311, ensuring the normal operation of the heating unit 2 and the cooling unit 3 respectively.

[0045] In addition, the detachable connection between the briquette 5 and the contact table 1, specifically, the briquette 5 is detachably connected to the main body of the contact table. The square platform is located between the two briquettes 5, which facilitates the maintenance of the heating unit 2 and the temperature measuring unit 4, timely replacement of some parts, reduction of maintenance costs, and extension of the service life of the device.

[0046] As Figure 1 、 Figure 2 shown, an in-situ liquid nitrogen cold-hot stage testing device further includes a fixed bottom plate 6 and a stand 7 connected and fixed to the fixed bottom plate 6. The overall volume of the device is small, and the external dimensions are 130mm X 30mm X 30mm. Threaded holes are reserved on the surface of the fixed bottom plate 6, and it can be installed and used through nuts with various brands of electron microscopes, Raman spectrometers, X-ray diffractometers, etc., with strong practicability and convenient installation and disassembly.

[0047] One end of the stand 7 is connected to the fixed bottom plate 6, and the other end is connected to the contact table 1, making part of the contact table 1 and the liquid nitrogen transmission pipeline assembly 31 suspended, providing a space for the L-shaped structure of the second section body 312 and the third section body 313, facilitating the erection of the liquid nitrogen transmission pipeline; and also enabling the heating unit 2 and the cooling unit 3 to have a certain distance from the scanning electron microscope instrument, avoiding damage to the instrument due to obvious temperature changes during the heating or cooling process.

[0048] In this embodiment, there are two stands 7. Taking Figure 5 the direction shown as an example, the two stands 7 are respectively connected to the left and right ends of the contact table 1, enhancing the supporting effect on the contact table 1; of course, in other embodiments, there can also be one stand 7, which can play a role in supporting the contact table 1.

[0049] Working process of the utility model: First is the preparation work before testing, the preparation work of the sample to be measured 11 (taking the metal sample 11 as an example). For samples to be measured 11 of different materials, there are different preparation processes. For the preparation of metal or alloy materials, slow wire electrical discharge machining is mostly used for one-time forming. For those with requirements for surface finish or flatness of the observation surface, surface treatment processes such as surface grinding, electro-polishing, and mechanical polishing can also be carried out on the sample 11 formed by wire electrical discharge machining to obtain a better surface morphology required for in-situ observation.

[0050] After the preliminary preparation work is completed, the sample to be measured 11 is pasted on the contact table 1 with heat-conducting glue and controlled and used by a self-written program. By controlling the magnitude of the current passed through the heating wire, the heating wire generates heat, and then the heat generated by the heating element 21 is conducted to the sample 11 through the contact table 1 in an indirect way such as heat conduction to realize the heating function of the sample 11; or by adjusting the output power of the micro air pump 9, liquid nitrogen is transmitted in the liquid nitrogen transmission pipeline assembly 31, and the temperature of the contact table 1 is reduced by the vaporization of liquid nitrogen, and the temperature of the sample 11 on the surface of the contact table 1 is reduced through temperature conduction to realize the cooling function of the sample 11. During the use process, the temperature measuring unit 4 can be used to detect the heating temperature of the heating wire or the cooling temperature of the liquid nitrogen transmission pipeline assembly 31 during the extraction of liquid nitrogen.

[0051] The above specific implementation manners are used to explain and illustrate the utility model, rather than limit the utility model. Any modification and change made to the utility model within the spirit and protection scope of the claims of the utility model fall within the protection scope of the utility model.

Claims

1. An in-situ liquid nitrogen cold and hot stage testing device, characterized in that include: A contact table (1) for placing a sample (11); A heating unit (2), at least partially passing through the contact station (1), comprising a heating element (21); A cooling unit (3) comprising a liquid nitrogen transmission pipeline assembly (31) connectable to a liquid nitrogen source (32), wherein at least a portion of the liquid nitrogen transmission pipeline assembly (31) passes through the contact stage (1); The temperature measuring unit (4) is used to detect the heating temperature of the contact platform (1) by the heating unit (2), or to detect the cooling temperature of the contact platform (1) by the cooling unit (3).

2. The in-situ liquid nitrogen cold and hot stage testing device according to claim 1, wherein: The liquid nitrogen transmission pipeline assembly (31) comprises a first section (311) penetrating the contact platform (1), and a second section (312) and a third section (313) located on both sides of the first section (311); the first section (311), the second section (312), and the third section (313) are connected, and the second section (312) and the third section (313) respectively form a liquid nitrogen inlet and a liquid nitrogen outlet.

3. The in-situ liquid nitrogen cooling and heating stage testing device according to claim 2, wherein: The second section (312) and / or the third section (313) comprises a metal tube (3121) and a corrugated tube (3122), and an adapter (314) is connected to the end of the corrugated tube (3122).

4. The in-situ liquid nitrogen cold and hot stage testing device according to claim 2, wherein: The second section (312) and / or the third section (313) are in an L-shape.

5. The in-situ liquid nitrogen cold and hot stage testing device according to claim 3, characterized in that: The adapter (314) of the liquid nitrogen outlet is connected to the micro air pump (9) via a hose (8).

6. The in-situ liquid nitrogen cold and hot stage testing device according to claim 1, wherein: The heating unit (2) further comprises an outer shell (22); the heating element (21) is a heating wire which is inserted into the outer shell (22); and the temperature measuring unit (4) is a thermocouple wire which is inserted into the outer shell (22) of the heating unit (2).

7. The in-situ liquid nitrogen cold and hot stage testing device according to claim 6, wherein: The contact platform (1) forms a limiting slot (12), the shell (22) is a metal shell, the metal shell is inserted into the limiting slot (12), and the pressing block (5) is detachably connected to the contact platform (1) to fix and assemble the metal shell.

8. The in-situ liquid nitrogen cold and hot stage testing device according to claim 1, characterized in that: It also comprises a fixed base plate (6) and a stand (7) connected to the fixed base plate (6), wherein the contact platform (1) is connected to the stand (7) so that the contact platform (1) and parts of the liquid nitrogen transmission pipeline assembly (31) are suspended in the air.

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