CN219777374U - Liquid nitrogen environment tensile test device for plate-shaped sample - Google Patents
Liquid nitrogen environment tensile test device for plate-shaped sample Download PDFInfo
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- CN219777374U CN219777374U CN202321052119.4U CN202321052119U CN219777374U CN 219777374 U CN219777374 U CN 219777374U CN 202321052119 U CN202321052119 U CN 202321052119U CN 219777374 U CN219777374 U CN 219777374U
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 60
- 239000007788 liquid Substances 0.000 title claims abstract description 33
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 30
- 238000009864 tensile test Methods 0.000 title claims abstract description 26
- 230000005484 gravity Effects 0.000 claims description 10
- 239000004964 aerogel Substances 0.000 claims description 5
- 241000276425 Xiphophorus maculatus Species 0.000 claims description 2
- 238000004321 preservation Methods 0.000 claims description 2
- 239000012299 nitrogen atmosphere Substances 0.000 claims 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000012360 testing method Methods 0.000 description 11
- 239000000463 material Substances 0.000 description 4
- 230000000712 assembly Effects 0.000 description 3
- 238000000429 assembly Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- 239000007769 metal material Substances 0.000 description 3
- 239000011229 interlayer Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The utility model discloses a liquid nitrogen environment tensile test device for a plate-shaped sample, which comprises a low-temperature environment box, an upper tensile clamp and a lower tensile clamp, and is characterized in that: the clamping ends of the upper stretching clamp and the lower stretching clamp are respectively provided with a clamping groove matched with the shape of the end part of the sample and in a dovetail shape, and two sides of the upper stretching clamp are respectively provided with a limiting assembly limiting the position of the sample in the clamping groove and a positioning assembly positioning the sample at the limiting end of the limiting assembly. The beneficial effects of the utility model are as follows: 1. through designing the limiting component and the positioning component, samples with different thicknesses can be stably limited at the designated positions of the clamping grooves; 2. after the tensile sample and the clamp are connected, the liquid nitrogen is poured into the box to quickly reduce the temperature of the tensile sample to (-196 ℃) of the liquid nitrogen, so that compared with a conventional environment box, the use amount of the liquid nitrogen is greatly reduced, and the cost can be reduced and the tensile test under the liquid nitrogen environment can be completed efficiently.
Description
Technical Field
The utility model belongs to the technical field of metal material mechanical property detection, and particularly relates to a liquid nitrogen environment tensile test device for a plate-shaped sample.
Background
Tensile testing is the most fundamental and most important test for testing the strength properties of materials, while low temperature stretching is an integral part of determining the strength properties of materials in extreme environments. The low-temperature mechanical properties such as yield strength, tensile strength, elongation and the like of the material need to be measured through a low-temperature tensile test, and according to the GB/T13239-2006 low-temperature tensile test method of the metal material, a low-temperature tensile device needs to ensure good heat preservation performance, and the absolute value of the temperature difference at two ends of the gauge length of a sample needs to be not more than 3 ℃. The low-temperature stretching equipment is generally high in cost due to severe limitation of conditions, and most of low-temperature stretching equipment at present adopts a gas refrigeration mode, so that the problems of low temperature reduction, uneven temperature and the like exist. For example, CN 207623154U discloses a tensile test device for a metal material at-196 ℃, and the low-temperature performance test of the material is realized by matching a low-temperature environment box and a matched clamp with a tensile test machine.
The prior art has the following technical problems: the test sample is limited by being arranged in the clamping slot of the clamp and the pin shaft, and the test sample with different thickness cannot be adapted due to the fact that the size of the clamping slot is determined.
Disclosure of Invention
The utility model aims to solve the technical problem of providing a liquid nitrogen environment tensile test device for a plate-shaped sample, wherein clamping grooves penetrating through the clamp and in a dovetail shape are arranged in an upper clamp and a lower clamp, and the sample is positioned at a designated position in the clamp through a matched limiting assembly and a matched positioning assembly, so that the test of samples with different thicknesses can be realized.
In order to solve the technical problems, the utility model adopts the following technical scheme: the utility model provides a liquid nitrogen environment tensile test device of platy sample, includes low temperature environment case, goes up tensile anchor clamps and lower tensile anchor clamps, and the key lies in: the clamping ends of the upper stretching clamp and the lower stretching clamp are respectively provided with a clamping groove matched with the shape of the end part of the sample and in a dovetail shape, and two sides of the upper stretching clamp are respectively provided with a limiting assembly limiting the position of the sample in the clamping groove and a positioning assembly positioning the sample at the limiting end of the limiting assembly.
Further, the limiting assembly comprises a limiting block located in the clamping groove, a limiting plate fixed on the upper stretching clamp and a position adjusting bolt in threaded connection with the limiting plate.
Further, the upper stretching clamp comprises an upper clamping head, an upper clamping plate positioned in a clamping slot of the upper clamping head and an upper positioning pin for connecting the upper clamping head and the upper clamping plate, the clamping groove is positioned at the free end of the upper clamping plate, and the limiting plate is connected with the upper clamping head.
Further, the positioning assembly comprises a hinge shaft hinged with the upper stretching clamp, a gravity rod and a connecting rod fixed on the hinge shaft, a positioning block positioned in the clamping groove and a connecting rod hinged with the positioning block and the connecting rod respectively.
Further, the hinge shaft is connected with the hinge seat, and the hinge seat is connected with the upper clamping head by means of an upper positioning pin.
Further, the lower stretching clamp comprises a lower clamping head, a lower clamping plate positioned in a clamping slot of the lower clamping head and a lower positioning pin for connecting the lower clamping head and the lower clamping plate, and the clamping groove is positioned at the free end of the lower clamping plate.
Further, the low-temperature environment box comprises a box body and a box cover positioned at the opening of the top of the box body.
Further, an aerogel heat insulation felt is arranged in the box body.
The beneficial effects of the utility model are as follows: 1. through designing the limiting component and the positioning component, samples with different thicknesses can be stably limited at the designated positions of the clamping grooves; 2. after the tensile sample and the clamp are connected, the liquid nitrogen is poured into the box to quickly reduce the temperature of the tensile sample to (-196 ℃) of the liquid nitrogen, so that compared with a conventional environment box, the use amount of the liquid nitrogen is greatly reduced, and the cost can be reduced and the tensile test under the liquid nitrogen environment can be completed efficiently.
The present utility model will be described in detail with reference to the accompanying drawings.
Drawings
FIG. 1 is a schematic structural view of a liquid nitrogen environment tensile test apparatus for a plate-like specimen according to the present utility model;
FIG. 2 is a schematic view of the structure of FIG. 1 with the cryogenic environment tank removed;
FIG. 3 is a schematic diagram of the structure of the upper stretching clamp and positioning assembly in the liquid nitrogen environment stretching test device for the plate-shaped sample of the present utility model;
FIG. 4 is a schematic diagram of the structure of a lower stretching clamp in a liquid nitrogen environment stretching test device for a plate-shaped sample according to the present utility model;
FIG. 5 is a schematic diagram showing the connection of the limiting assembly and the positioning assembly with the upper stretching clamp in the liquid nitrogen environment stretching test device for the plate-shaped sample;
FIG. 6 is a schematic view showing the internal structure of a box in a liquid nitrogen environment tensile test apparatus for a plate-like specimen according to the present utility model.
In the drawing, 1, an upper pull rod, 2, a lower pull rod, 3, a sample, 4, a clamping groove, 5, a box body, 6, a box cover, 7, an aerogel heat insulation felt, 8, an upper clamping head, 9, an upper clamping plate, 10, an upper positioning pin, 11, a lower clamping head, 12, a lower clamping plate, 13, a lower positioning pin, 14, a limiting block, 15, a limiting plate, 16, an adjusting bolt, 17, a hinge shaft, 18, a hinge seat, 19, a gravity rod, 20, a connecting rod, 21, a connecting rod, 22, a positioning block, 23 and a connecting sleeve.
Detailed Description
Referring to fig. 1 to 6, the utility model provides a liquid nitrogen environment tensile test device for a plate-shaped sample, which comprises a low-temperature environment box, an upper tensile fixture connected with an upper pull rod 1 of a tensile device and a lower tensile fixture connected with a lower pull rod 2 of the tensile device, wherein the key point is that: clamping grooves 4 matched with the shapes of the ends of the samples 3 and formed in a dovetail shape are formed in the clamping ends of the upper stretching clamp and the lower stretching clamp, and limiting assemblies limiting the positions of the samples 3 in the clamping grooves 4 and positioning assemblies positioning the samples 3 at the limiting ends of the limiting assemblies are respectively arranged on two sides of the upper stretching clamp.
Referring to fig. 1 and 6, the above-mentioned low temperature environment tank includes a tank body 5, and a tank cover 6 positioned at the top opening of the tank body 5. An insulating interlayer is arranged in the box body 5, and an aerogel insulating felt 7 is arranged in the insulating interlayer of the box body 5 so as to achieve the insulating effect, avoid volatilization of liquid nitrogen as much as possible and reduce experimental cost. An aerogel insulation blanket can also be stuck on the outer side of the box body 5. Wherein the box body 5 is connected with the lower pull rod 2. Since the upper tie rod 1 passes through the tank cover 6, the tank cover 6 is divided into two parts from the center of symmetry for easy installation and addition of liquid nitrogen.
Referring to fig. 2 to 5, the upper stretching clamp includes an upper jaw 8 connected to the upper draw bar 1, an upper clamping plate 9 positioned in a clamping slit of the upper jaw 8, and an upper positioning pin 10 connecting the upper jaw 8 and the upper clamping plate 9, and a clamping groove 4 for clamping the top of the specimen 3 is positioned at a free end of the upper clamping plate 9. The lower stretching clamp comprises a lower clamping head 11 connected with the lower pull rod 2, a lower clamping plate 12 positioned in a clamping slot of the lower clamping head 11, and a lower positioning pin 13 connecting the lower clamping head 11 and the lower clamping plate 12, and a clamping groove 4 used for clamping the bottom of the sample 3 is positioned at the free end of the lower clamping plate 12.
Referring to fig. 2 and 5, the above-mentioned limiting assembly includes a limiting block 14 located in the clamping groove 4, a limiting plate 15 fixed on the upper stretching clamp, and a position adjusting bolt 16 screwed with the limiting plate 15. Specifically, the limiting plate 15 is connected to the upper chuck 8. The stopper 14 may have a dovetail shape conforming to the clamping groove 4. The position in the clamping groove 4 in the limiting block 14 can be limited by adjusting the threaded connection distance between the adjusting bolt 16 and the limiting plate 15, and then the top of the sample 3 is limited.
Referring to fig. 2, 3 and 5, the above-mentioned positioning assembly includes a hinge shaft 17 hinged with the upper stretching jig, a gravity bar 19 and a connecting bar 20 fixed on the hinge shaft 17, a positioning block 22 positioned in the clamping groove 4, and a connecting bar 21 hinged with the positioning block 22 and the connecting bar 20, respectively. In order to facilitate the installation of the hinge shaft 17, a hinge seat 18 is provided on the upper chuck 8, and the hinge shaft 17 is connected to the hinge seat 18. The positioning block 22 has a height smaller than the height of the clamping groove 4 so that a certain movable space can be provided in the groove. The hinge seat 18 is connected to the upper jaw 8 by means of the upper locating pin 10. In order to facilitate the installation of the gravity rod 19 and the connecting rod 20, the connecting sleeve 23 is sleeved on the hinge shaft 17, and the gravity rod 19 and the connecting rod 20 are in threaded connection with the connecting sleeve 23. Under the action of gravity, the gravity rod 19 drives the connecting rod 20 and the connecting rod 20 to enable the positioning block 22 to have force moving into the clamping groove 4, so that the top of the sample 3 is abutted against the inner side of the limiting block 14.
The working process of the device of the utility model is as follows: both ends of the sample 3 are formed in a shape matching the holding groove 4. The stopper 14 is positioned at a designated position in the clamping groove 4 by rotating the position adjusting bolt 16, and then both ends of the specimen 3 are placed in the clamping grooves 4 of the corresponding clamping plates. The positioning block 22 is placed in the clamping groove 4, then the gravity rod 19 is released, and the positioning block 22 compresses the sample 3 on one side of the limiting block 14 through the connecting rod structure under the action of gravity. Liquid nitrogen is poured into the tank 5 and the tank cover 6 is closed. And the test piece 3 to be stretched is fully contacted with liquid nitrogen, the temperature of the test piece can be reduced to the liquid nitrogen temperature in a short time, and then a tensile testing machine is started to carry out a tensile test on the test piece.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model and not for limiting the same; while the utility model has been described in detail with reference to the preferred embodiments, those skilled in the art will appreciate that: modifications may be made to the specific embodiments of the present utility model or equivalents may be substituted for part of the technical features thereof; without departing from the spirit of the utility model, it is intended to cover the scope of the utility model as claimed.
Claims (8)
1. The utility model provides a liquid nitrogen environment tensile test device of platy sample, includes low temperature environment case, goes up tensile anchor clamps and lower tensile anchor clamps, its characterized in that: the clamping ends of the upper stretching clamp and the lower stretching clamp are respectively provided with a clamping groove (4) which is matched with the shape of the end part of the sample and is in a dovetail shape, and two sides of the upper stretching clamp are respectively provided with a limiting assembly which limits the position of the sample in the clamping groove (4) and a positioning assembly which positions the sample at the limiting end of the limiting assembly.
2. The liquid nitrogen environment tensile test device for a plate-like specimen according to claim 1, wherein: the limiting assembly comprises a limiting block (14) positioned in the clamping groove (4), a limiting plate (15) fixed on the upper stretching clamp and a position adjusting bolt (16) in threaded connection with the limiting plate (15).
3. The liquid nitrogen environment tensile test device for a plate-like specimen according to claim 2, wherein: the upper stretching clamp comprises an upper clamping head (8), an upper clamping plate (9) located in a clamping seam of the upper clamping head (8) and an upper positioning pin (10) connected with the upper clamping head (8) and the upper clamping plate (9), the clamping groove (4) is located at the free end of the upper clamping plate (9), and the limiting plate (15) is connected with the upper clamping head (8).
4. A liquid nitrogen ambient tensile test apparatus for a plate-like specimen according to claim 3, wherein: the positioning assembly comprises a hinge shaft (17) hinged with the upper stretching clamp, a gravity rod (19) and a connecting rod (20) fixed on the hinge shaft (17), a positioning block (22) positioned in the clamping groove (4) and a connecting rod (21) hinged with the positioning block (22) and the connecting rod (20) respectively.
5. The liquid nitrogen atmosphere tensile test device for a plate-like specimen according to claim 4, wherein: the hinge shaft (17) is connected with a hinge seat (18), and the hinge seat (18) is connected with the upper clamping head (8) by means of an upper locating pin (10).
6. The liquid nitrogen environment tensile test device for a plate-like specimen according to claim 1, wherein: the lower stretching clamp comprises a lower clamp head (11), a lower clamping plate (12) positioned in a clamping seam of the lower clamp head (11) and a lower positioning pin (13) for connecting the lower clamp head (11) and the lower clamping plate (12), and the clamping groove (4) is positioned at the free end of the lower clamping plate (12).
7. The liquid nitrogen atmosphere tensile test device for a plate-like specimen according to any one of claims 1 to 6, wherein: the low-temperature environment box comprises a box body (5) and a box cover (6) positioned at the opening of the top of the box body (5).
8. The liquid nitrogen atmosphere tensile test device for a plate-like specimen according to claim 7, wherein: an aerogel heat preservation felt (7) is arranged in the box body (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321052119.4U CN219777374U (en) | 2023-05-05 | 2023-05-05 | Liquid nitrogen environment tensile test device for plate-shaped sample |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321052119.4U CN219777374U (en) | 2023-05-05 | 2023-05-05 | Liquid nitrogen environment tensile test device for plate-shaped sample |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219777374U true CN219777374U (en) | 2023-09-29 |
Family
ID=88105229
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321052119.4U Active CN219777374U (en) | 2023-05-05 | 2023-05-05 | Liquid nitrogen environment tensile test device for plate-shaped sample |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219777374U (en) |
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2023
- 2023-05-05 CN CN202321052119.4U patent/CN219777374U/en active Active
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