CN211668995U - Low-temperature nano indentation experimental device - Google Patents
Low-temperature nano indentation experimental device Download PDFInfo
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- CN211668995U CN211668995U CN202020372787.5U CN202020372787U CN211668995U CN 211668995 U CN211668995 U CN 211668995U CN 202020372787 U CN202020372787 U CN 202020372787U CN 211668995 U CN211668995 U CN 211668995U
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Abstract
The utility model discloses a low-temperature nano indentation experimental device, which comprises a base, a working table plate, a vacuum cover and a testing machine from bottom to top in sequence, wherein the center of the working table plate is a through circular cavity, the middle part of the circular cavity is fixedly connected with a heat exchange plate, and a disc-shaped sample tray is placed above the heat exchange plate; the upper surface of the sample tray is provided with a sample clamping component and an annular rack, and the rack is engaged with a servo motor. The top of the vacuum cover is provided with an opening, and a pressure rod of the testing machine penetrates through the opening; a liquid guide pipe which is distributed in a disc shape is arranged below the sample tray, a plurality of vertically upward spray heads are connected to the liquid guide pipe, and the tail end of the liquid guide pipe is connected with a liquid nitrogen storage tank. A plurality of experimental strips can be placed on the sample bearing disc at the same time, so that mechanical parameters of the same material at different temperatures can be measured conveniently, the experiment development is facilitated, the experiment time is effectively shortened, the liquid nitrogen consumption is reduced, and the experiment cost is reduced.
Description
Technical Field
The utility model belongs to the technical field of superconducting material test device, concretely relates to low temperature nanometer indentation experimental apparatus.
Background
With the development of nanotechnology, new nanostructures, nanomaterials and their excellent properties are continuously discovered and recognized by people, and show very broad application prospects. The rapid development of novel nano materials urgently needs a matched nano mechanical property test strategy. Because of the limitation of the traditional testing means, scientists have developed a nano indentation testing method, which gradually becomes a means for testing the basic mechanical properties of materials because the method has the advantages of no special requirements on samples, quick testing and the like.
Although the nanoindentation test method has certain advantages for the traditional tension and compression test, most commercial nanoindentation test devices in the market at present can only realize room temperature and high temperature tests, and the nanoindentation test method rarely relates to a low-temperature environment. With the rapid development of the fields of superconducting science and technology, high-speed transportation and the like, the performance test of superconducting materials draws attention. However, the superconducting material can fully exert the performance only in a low-temperature environment (4.2-77K), so that the superconducting material is very important for nano indentation test research in the low-temperature environment.
Although some laboratories have tried to design nanoindentation devices in low temperature environments, they have not been widely accepted and popularized due to their lack of design experience.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the problem that the existing nano indentation test device is difficult to test superconducting materials.
Therefore, the utility model adopts the following technical scheme:
a low-temperature nanoindentation experimental device comprises a horizontal working table plate, wherein the center of the working table plate is a through round cavity, the round cavity is trapezoidal, and an opening at the upper end is large while an opening at the lower end is small; the middle part of the circular cavity is fixedly connected with a heat exchange plate which separates the upper end and the lower end of the circular cavity;
a disc-shaped sample tray is placed above the heat exchange plate, and the sample tray is tightly attached to the heat exchange plate; the upper surface of the sample tray is provided with an annular rack and a plurality of sample clamping assemblies which are arranged annularly, the rack is engaged with a gear, and the gear is connected with a servo motor; the outer edge of the sample tray is connected with a plurality of rollers, and the rollers are tightly attached to the inner wall of the circular cavity;
a vacuum cover is arranged above the working table plate, a round hole is formed in the top of the vacuum cover, a pressure rod of a testing machine penetrates through the hole, and a sealing ring is arranged between the pressure rod and the vacuum cover; a liquid guide pipe is arranged below the sample tray in a disc shape, a plurality of vertically upward spray heads are connected to the liquid guide pipe, and the tail end of the liquid guide pipe is connected with a liquid nitrogen storage tank.
Furthermore, the clamping assembly comprises two arc-shaped clamping elastic sheets which are arranged in parallel, one end of each clamping elastic sheet is fixedly connected with the sample tray, and the other end of each clamping elastic sheet can compress the experimental material; the lower surface of the front end of the clamping elastic sheet is also connected with a patch type temperature sensor.
Furthermore, the clamping assemblies are uniformly distributed along the ring shape, and when the sample tray rotates, each clamping assembly sequentially penetrates through the position right below the pressure rod.
Furthermore, a closed base is arranged below the workbench, a cavity is formed inside the base, the liquid guide pipe penetrates through one side of the base, an exhaust hole is formed in the other side of the base, and an exhaust pipe is connected to the exhaust hole.
Furthermore, the lower surface of the working table plate and the outer side of the base are wrapped with heat insulation plates.
Furthermore, the upper surface of the working table plate is provided with a fixing groove for placing the vacuum cover.
Further, the heat exchange plate and the sample tray are both made of copper materials.
The beneficial effects of the utility model reside in that: the sample holding tray can be used for simultaneously placing a plurality of groups of experimental materials, so that mechanical parameters of the same material at different temperatures or mechanical parameters of different materials can be conveniently measured, the development of tests is facilitated, the test time can be effectively shortened, the liquid nitrogen consumption is reduced, and the test cost is reduced.
Drawings
FIG. 1 is a front view of the structure of the present invention;
FIG. 2 is an enlarged view of a portion A of FIG. 1;
FIG. 3 is a top view of the structure of the work platform;
in the figure: 1-a working table plate, 2-a circular cavity, 3-a heat exchange plate, 4-a sample tray, 5-a clamping elastic sheet, 6-a rack, 7-a servo motor, 8-a vacuum cover, 9-a pressure rod, 10-a sealing ring, 11-a fixed groove, 12-a base, 13-a liquid guide pipe, 14-a spray head, 15-an exhaust hole, 16-a roller, 17-a heat insulation plate and 18-a gear.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings:
as shown in fig. 1 to 3, a low-temperature nanoindentation experimental apparatus comprises a base 12, a working platen 1, a vacuum cover 8 and a testing machine in sequence from bottom to top. The center of the working table plate 1 is a through round cavity 2, the round cavity 2 is trapezoidal, and the upper end opening is large and the lower end opening is small. The middle step of the circular cavity 2 is fixedly connected with a copper heat exchange plate 3, and the upper end and the lower end of the circular cavity 2 are separated by the heat exchange plate 3.
A disc-shaped copper sample tray 4 is placed above the heat exchange plate 3, and the diameter of the sample tray 4 is smaller than the diameter of an opening at the upper end of the circular cavity 2. Heat transfer plate 3 is hugged closely to sample tray 4, and the upper surface of sample tray 4 is equipped with six and is the even sample centre gripping subassemblies of laying of annular, and every centre gripping subassembly includes two arc centre gripping shell fragments 5 that set up side by side, and the one end and the sample tray 4 fixed connection of centre gripping shell fragment 5, the other end can compress tightly experimental material, still is connected with SMD temperature sensor on the lower surface of centre gripping shell fragment 5 front end. The upper surface of the sample tray 4 is also provided with an annular rack 6, the rack 6 is engaged with a gear 18 and a servo motor 7 connected with the gear 18, and the servo motor 7 is fixedly connected with the working table plate 1. The outer edge of the sample tray 4 is connected with a plurality of rollers 16, and the rollers 16 are tightly attached to the inner wall of the circular cavity 2. When the servo motor 7 rotates, the sample tray 4 can be driven to rotate around the center through the gear 18 and the rack 6.
A vacuum cover 8 is arranged above the working table plate 1, and a fixing groove 11 for placing the vacuum cover 8 is arranged on the upper surface of the working table plate 1. The top of the vacuum cover 8 is provided with a round opening, a pressure rod 9 of the testing machine penetrates through the opening to extend into the vacuum cover 8, and a sealing ring 10 is arranged between the pressure rod 9 and the vacuum cover 8. When the sample tray 4 rotates, the experimental materials placed on each clamping assembly sequentially pass through the right lower part of the pressure rod 9.
The base 12 below the workbench is sealed, the interior of the base 12 is a cavity, and two sides of the base 12 are respectively provided with an opening. A liquid guide pipe 13 for conveying liquid nitrogen penetrates through the opening at one side of the base 12 and is wound below the sample tray 4 to form a disc shape, a plurality of vertically upward spray heads 14 are connected to the disc-shaped liquid guide pipe 13, the front ends of the spray heads 14 are close to the lower surface of the sample tray 4, and the tail end of the liquid guide pipe 13 is connected with a liquid nitrogen storage tank. An exhaust hole 15 is formed at the other side of the base 12, and an exhaust pipe is connected to the exhaust hole 15. In addition, in order to prevent the external heat conduction from influencing the experiment, the lower surface of the working table plate 1 and the outer side of the base 12 are wrapped with heat insulation plates 17, and the heat insulation plates 17 can be made of rock wool materials or multi-layer vacuum plates.
One side of the experimental device is also provided with a control system, the control system is provided with a data recording and analyzing system, and the data recording and analyzing system adopts the prior art. Meanwhile, a temperature controller is also arranged, and the temperature controller can display the temperature value measured by each temperature sensor in real time. The controller is also in signal connection with the servo motor 7, and an experimental material is aligned below the pressure rod 9 in the initial position. The sample tray 4 is rotated 60 degrees every time the servo motor 7 is operated, so that the next set of test strips is aligned with the pressure bar 9.
The working principle of the utility model is as follows:
during testing, the vacuum cover 8 is opened firstly, the test materials are installed below the clamping elastic sheet 5, the materials are guaranteed to be laid flat and tightly attached to the sample tray 4, the vacuum cover 8 is put down after the test materials are installed in place, and then air in the vacuum cover 8 is exhausted.
After the vacuum cover 8 reaches a certain vacuum degree, a liquid nitrogen tank is opened, and liquid nitrogen is sprayed below the heat exchange plate 3 through a liquid guide pipe 13. The liquid nitrogen tank can be connected with a high-pressure nitrogen tank, and the liquid nitrogen in the liquid nitrogen tank is pressed out by the high-pressure nitrogen. The liquid nitrogen is sprayed to the bottom of the heat exchange plate 3 and then rapidly gasified, the temperature of the heat exchange plate 3 is reduced, and the heat on the sample tray 4 is taken away after the temperature of the heat exchange plate 3 is reduced. Likewise, the temperature of the test material decreased.
And when the temperature is reduced to the temperature required by the experiment, controlling the press machine to test each experimental material. The servo motor 7 drives the sample tray 4 to rotate in real time, so that the mechanical properties of other experimental materials are measured.
It should be noted that the above are only some embodiments of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.
Claims (7)
1. The low-temperature nano indentation experimental device is characterized by comprising a horizontal working table plate (1), wherein the center of the working table plate (1) is a through circular cavity (2), the circular cavity (2) is trapezoidal, and an opening at the upper end is large while an opening at the lower end is small; the middle part of the circular cavity (2) is fixedly connected with a heat exchange plate (3), and the heat exchange plate (3) separates the upper end and the lower end of the circular cavity (2);
a disc-shaped sample tray (4) is placed above the heat exchange plate (3), and the sample tray (4) is tightly attached to the heat exchange plate (3); an annular rack (6) and a plurality of sample clamping assemblies which are arranged annularly are arranged on the upper surface of the sample tray (4), a gear (18) is meshed on the rack (6), and a servo motor (7) is connected on the gear (18); the outer edge of the sample tray (4) is connected with a plurality of rollers (16), and the rollers (16) are tightly attached to the inner wall of the circular cavity (2);
a vacuum cover (8) is arranged above the working table plate (1), a round hole is formed in the top of the vacuum cover (8), a pressure rod (9) of a testing machine penetrates through the hole, and a sealing ring (10) is arranged between the pressure rod (9) and the vacuum cover (8); a liquid guide pipe (13) which is distributed in a disc shape is arranged below the sample tray (4), a plurality of vertically upward spray heads (14) are connected to the liquid guide pipe (13), and the tail end of the liquid guide pipe (13) is connected with a liquid nitrogen storage tank.
2. The low-temperature nanoindentation experimental apparatus according to claim 1, wherein the clamping assembly comprises two arc-shaped clamping spring pieces (5) arranged in parallel, one end of each clamping spring piece (5) is fixedly connected with the sample tray (4), and the other end of each clamping spring piece can compress experimental materials; the lower surface of the front end of the clamping elastic sheet (5) is also connected with a patch type temperature sensor.
3. The device according to claim 2, wherein the clamping assemblies are uniformly arranged along a ring shape, and when the sample tray (4) rotates, each clamping assembly sequentially passes through a position right below the pressure rod (9).
4. The low-temperature nanoindentation experimental apparatus as claimed in claim 1, wherein a closed base (12) is arranged below the workbench, the base (12) is internally provided with a cavity, the liquid guide pipe (13) penetrates through one side of the base (12), the other side of the base (12) is further provided with an exhaust hole (15), and the exhaust hole (15) is connected with an exhaust pipe.
5. The low-temperature nanoindentation experimental apparatus according to claim 4, wherein the lower surface of the working platen (1) and the outer side of the base (12) are wrapped with heat insulation plates (17).
6. The low-temperature nanoindentation experimental apparatus according to claim 1, wherein a fixing groove (11) for placing a vacuum cover (8) is formed in an upper surface of the working platen (1).
7. The low-temperature nanoindentation experimental apparatus according to claim 1, wherein the heat exchange plate (3) and the sample tray (4) are both made of copper material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020372787.5U CN211668995U (en) | 2020-03-23 | 2020-03-23 | Low-temperature nano indentation experimental device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020372787.5U CN211668995U (en) | 2020-03-23 | 2020-03-23 | Low-temperature nano indentation experimental device |
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| CN211668995U true CN211668995U (en) | 2020-10-13 |
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| CN202020372787.5U Active CN211668995U (en) | 2020-03-23 | 2020-03-23 | Low-temperature nano indentation experimental device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111189730A (en) * | 2020-03-23 | 2020-05-22 | 兰州大学 | Low-temperature nano indentation experimental device |
| CN116222950A (en) * | 2023-05-04 | 2023-06-06 | 中国空气动力研究与发展中心高速空气动力研究所 | Dynamic test platform for verifying reliability of low-temperature model |
-
2020
- 2020-03-23 CN CN202020372787.5U patent/CN211668995U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111189730A (en) * | 2020-03-23 | 2020-05-22 | 兰州大学 | Low-temperature nano indentation experimental device |
| CN111189730B (en) * | 2020-03-23 | 2024-09-20 | 兰州大学 | Low-temperature nano indentation experimental device |
| CN116222950A (en) * | 2023-05-04 | 2023-06-06 | 中国空气动力研究与发展中心高速空气动力研究所 | Dynamic test platform for verifying reliability of low-temperature model |
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