CN221100275U - Clamp for testing thermomechanical analyzer - Google Patents
Clamp for testing thermomechanical analyzer Download PDFInfo
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- CN221100275U CN221100275U CN202322478561.XU CN202322478561U CN221100275U CN 221100275 U CN221100275 U CN 221100275U CN 202322478561 U CN202322478561 U CN 202322478561U CN 221100275 U CN221100275 U CN 221100275U
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- 238000012360 testing method Methods 0.000 title claims abstract description 37
- 230000000930 thermomechanical effect Effects 0.000 title claims abstract description 30
- 239000000463 material Substances 0.000 claims description 9
- 239000000523 sample Substances 0.000 abstract description 64
- 230000006835 compression Effects 0.000 abstract description 8
- 238000007906 compression Methods 0.000 abstract description 8
- 238000005259 measurement Methods 0.000 abstract description 8
- 230000009471 action Effects 0.000 description 3
- 238000010998 test method Methods 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000002076 thermal analysis method Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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Abstract
The utility model discloses a clamp for testing a thermomechanical analyzer, which comprises a base, a pressing block and two clamping blocks; the upper ends of the left vertical post and the right vertical post of the U-shaped base are arc surfaces with the same diameter; the axis of the arc surface is in the front-back direction; the radian of the arc surface is larger than 180 degrees; w is less than or equal to D, D is the diameter of the arc surface, and W is the left-right width of the lower ends of the left vertical post and the right vertical post; the pressing block is semi-cylindrical; d is more than or equal to 0.8S and less than or equal to S, the diameter of the half cylinder d is the minimum distance between the two arc surfaces at the upper ends of the left vertical post and the right vertical post; the two clamping blocks are used for being installed and fixed at the left end and the right end of the bottom cross column, and the two ends of the strip-shaped sample are respectively fixed at the left end and the right end of the bottom cross column. The utility model can make the probe and sample carrying table of the thermal mechanical analyzer for measuring compression complete the measurement of the stretching of the strip-shaped sample, thereby reducing the equipment cost and the replacement times and ensuring the accurate measurement result.
Description
Technical Field
The utility model relates to a thermal analysis testing technology, in particular to a clamp for testing a thermo-mechanical analyzer (TMA).
Background
A thermo-mechanical analyzer (TMA) is a device for measuring the functional relationship between the deformation of a substance and the temperature time under the action of a program temperature and a non-vibration load, and can measure parameters such as the thermal expansion coefficient and the phase transition temperature of the substance.
Commercial thermo-mechanical analyzers (TMAs) are equipped with different probes and Stage to accommodate different test scenarios. The probe and the sample carrying table for measuring the stretching and the compression of the sample are different, each set of probe and sample carrying table needs to be prepared to finish two kinds of tests, and the probe and the sample carrying table need to be replaced during the test. More importantly, the set of probes and the sample stage are very expensive.
Disclosure of utility model
The utility model aims to solve the technical problem of providing the clamp for testing the thermo-mechanical analyzer, so that the probe and the sample carrying table for measuring compression of the thermo-mechanical analyzer can finish the measurement of stretching of a strip-shaped sample, thereby reducing the equipment cost and the replacement times and ensuring accurate measurement results.
In order to solve the technical problems, the clamp for testing the thermo-mechanical analyzer provided by the utility model comprises a base 1, a pressing block 2 and two clamping blocks 3;
The base 1 is U-shaped and comprises a bottom cross column 10, a left vertical column 11 and a right vertical column 12;
the lower end of the left vertical column 11 is vertically fixed at the left end of the bottom transverse column 10;
the lower end of the right vertical column 12 is vertically fixed at the right end of the bottom transverse column 10;
The upper ends of the left vertical post 11 and the right vertical post 12 are arc surfaces with the same diameter;
The axis of the arc surface is in the front-back direction;
the left end of the arc surface at the upper end of the left vertical post 11 is tangent to the left side surface of the left vertical post 11;
the right end of the arc surface at the upper end of the right vertical post 12 is tangent to the right side surface of the right vertical post 12;
the radian of the arc surface is more than 180 degrees and less than 270 degrees;
W is not less than D and not more than 1.5W, D is the diameter of the arc surface, and W is the left-right width of the lower ends of the left vertical post 11 and the right vertical post 12;
The pressing block 2 is semi-cylindrical; d is more than or equal to 0.8S and less than or equal to S, the diameter of the half cylinder d is the minimum distance between the two arc surfaces at the upper ends of the left vertical post 11 and the right vertical post 12;
The two clamping blocks 3 are used for being installed and fixed at the left end and the right end of the bottom transverse column 10, and the two ends of the strip-shaped sample 4 are respectively fixed at the left end and the right end of the bottom transverse column 10.
Preferably, W is more than or equal to 0.1L and less than or equal to 0.3L, and L is the left and right length of the bottom transverse column 10.
Preferably, the left side surface of the left vertical post 11 is flush with the left end surface of the bottom transverse post 10;
The right side surface of the right vertical post 12 is flush with the right end surface of the bottom cross post 10.
Preferably, the left side surface of the left vertical post 11 extends out from 0.1mm to 10mm to the left side of the left end surface of the bottom cross post 10;
the right side surface of the right vertical post 12 protrudes from 0.1mm to 10mm to the right side of the right end surface of the bottom cross post 10.
Preferably, the right end of the arc surface at the upper end of the left vertical post 11 is positioned on the right side surface of the left vertical post 11;
the left end of the arc surface at the upper end of the right vertical column 12 is positioned on the left side surface of the right vertical column 12.
Preferably, the distance from the right end of the arc surface at the upper end of the left upright post 11 and the left end of the arc surface at the upper end of the right upright post 12 to the upper side surface of the bottom cross post 10 is greater than d.
Preferably, d=s.
Preferably, the axis of the arc surface at the upper end of the left upright post 11 and the axis of the arc surface at the upper end of the right upright post 12 are equidistant from the upper side surface of the bottom cross post 10.
Preferably, two through holes are formed on each clamping block 3;
Two screw holes are correspondingly formed at the left end of the bottom transverse column 10;
two screw holes are correspondingly formed at the right end of the bottom transverse column 10;
bolts penetrate through holes of the clamping blocks 3 and are in threaded fit with screw holes at the left end and the right end of the bottom transverse column 10, so that the two clamping blocks 3 are installed and fixed at the left end and the right end of the bottom transverse column 10, and the two ends of the strip-shaped sample 4 are respectively fixed at the left end and the right end of the bottom transverse column 10.
Preferably, the base 1 and the pressing block 2 are made of the same material.
Preferably, the thermal expansion coefficient of the materials of the base 1 and the pressing block 2 is smaller than that of the strip-shaped sample 4.
The clamp for testing the thermo-mechanical analyzer (TMA) can enable the probe and the sample carrying platform for measuring compression of the thermo-mechanical analyzer (TMA) to finish the measurement of stretching of a strip-shaped sample under the condition of not changing the relative positions of the probe and the sample carrying platform, thereby reducing equipment cost and replacement times. The fixture can also overcome the influence of air flow in the test process, and can enable the measurement result to be accurate.
Drawings
In order to more clearly illustrate the technical solutions of the present utility model, the following brief description of the drawings is given for the purpose of the present utility model, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and that other drawings can be obtained according to these drawings without the need for inventive work for a person skilled in the art.
FIG. 1 is a schematic perspective view of one embodiment of a fixture for testing a thermal mechanical analyzer of the present utility model;
FIG. 2 is a front view of an embodiment of a fixture for thermal mechanical analyzer testing of the present utility model.
Reference numerals illustrate:
1, a base; 10 bottom cross posts; 11 left upstands; 12 right upstands; 2, briquetting; 3 clamping blocks; 4 samples.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by a person skilled in the art based on the embodiments of the utility model without any inventive effort, are intended to fall within the scope of the utility model.
The terms "first," "second," and the like, as used herein, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that elements or items preceding the word are included in the element or item listed after the word and equivalents thereof, but does not exclude other elements or items. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", "front", "rear", etc. are used merely to indicate relative positional relationships, which may also change accordingly when the absolute position of the object to be described changes.
It should be noted that, without conflict, the embodiments of the present utility model and features of the embodiments may be combined with each other.
Example 1
As shown in fig. 1 and 2, a fixture for testing a thermo-mechanical analyzer (TMA) comprises a base 1, a pressing block 2 and two clamping blocks 3;
The base 1 is U-shaped and comprises a bottom cross column 10, a left vertical column 11 and a right vertical column 12;
the lower end of the left vertical column 11 is vertically fixed at the left end of the bottom transverse column 10;
the lower end of the right vertical column 11 is vertically fixed at the right end of the bottom transverse column 10;
The upper ends of the left vertical post 11 and the right vertical post 12 are arc surfaces with the same diameter;
The axis of the arc surface is in the front-back direction;
the left end of the arc surface at the upper end of the left vertical post 11 is tangent to the left side surface of the left vertical post 11;
the right end of the arc surface at the upper end of the right vertical post 12 is tangent to the right side surface of the right vertical post 11;
the radian of the arc surface is more than 180 degrees and less than 270 degrees;
W is not less than D and not more than 1.5W, D is the diameter of the arc surface, and W is the left-right width of the lower ends of the left vertical post 11 and the right vertical post 12;
The pressing block 2 is semi-cylindrical; d is more than or equal to 0.8S and less than or equal to S, the diameter of the half cylinder d is the minimum distance between the two arc surfaces at the upper ends of the left vertical post 11 and the right vertical post 12;
The two clamping blocks 3 are used for being installed and fixed at the left end and the right end of the bottom transverse column 10, and the two ends of the strip-shaped sample 4 are respectively fixed at the left end and the right end of the bottom transverse column 10.
The jig for testing a thermo-mechanical analyzer (TMA) according to the first embodiment enables the probe and the stage for measuring compression of the thermo-mechanical analyzer (TMA) to perform measurement of stretching of a strip-shaped sample without changing the relative positions of the probe and the stage, thereby reducing the equipment cost and the number of replacement times. The fixture can also overcome the influence of air flow in the test process, and can enable the measurement result to be accurate.
Example two
Based on the clamp for Thermal Mechanical Analyzer (TMA) test of the first embodiment, 0.1 L.ltoreq.W.ltoreq.0.3L, L being the left and right length of the bottom rail 10.
Preferably, the left side surface of the left vertical post 11 is flush with the left end surface of the bottom transverse post 10; the right side surface of the right vertical post 12 is flush with the right end surface of the bottom cross post 10.
Preferably, the left side surface of the left vertical post 11 extends out from 0.1mm to 10mm to the left side of the left end surface of the bottom cross post 10; the right side surface of the right vertical post 12 protrudes from 0.1mm to 10mm to the right side of the right end surface of the bottom cross post 10.
Example III
The right end of the arc surface at the upper end of the left vertical column 11 is positioned on the right side surface of the left vertical column 11;
The left end of the arc surface at the upper end of the right vertical post 12 is positioned on the left side surface of the right vertical post 11.
Preferably, the axis of the arc surface at the upper end of the left upright post 11 and the axis of the arc surface at the upper end of the right upright post 12 are equidistant from the upper side surface of the bottom cross post 10.
Example IV
The distance from the right end of the circular arc surface at the upper end of the left upright post 11 and the left end of the circular arc surface at the upper end of the right upright post 12 to the upper side surface of the bottom cross post 10 is greater than d.
Preferably, d=s.
Example five
Based on the jig for Thermal Mechanical Analyzer (TMA) test of the first embodiment, two through holes are formed on each of the clamping blocks 3;
Two screw holes are correspondingly formed at the left end of the bottom transverse column 10;
two screw holes are correspondingly formed at the right end of the bottom transverse column 10;
bolts penetrate through holes of the clamping blocks 3 and are in threaded fit with screw holes at the left end and the right end of the bottom transverse column 10, so that the two clamping blocks 3 are installed and fixed at the left end and the right end of the bottom transverse column 10, and the two ends of the strip-shaped sample 4 are respectively fixed at the left end and the right end of the bottom transverse column 10.
Preferably, the base 1 and the pressing block 2 are made of the same material.
Preferably, the thermal expansion coefficient of the materials of the base 1 and the compact 2 is smaller than that of the strip-shaped sample 4.
Example six
A thermal testing method using the jig for testing a thermo-mechanical analyzer (TMA) of the first embodiment, the thermo-mechanical analyzer (TMA) having a Probe (Probe) capable of measuring compression and a Stage, comprising the steps of:
S1, placing a base 1 on a sample loading table (Stage) of a thermo-mechanical analyzer (TMA);
S2, attaching the strip-shaped sample 4 to the arc surface of the upper end of the left vertical column 11 and the arc surface of the upper end of the right vertical column 12 of the U-shaped base 1, and fixing the two ends of the strip-shaped sample 4 to the left end and the right end of the bottom transverse column 10 through the clamping blocks 3 respectively;
S3, placing the pressing block 2 on the strip-shaped sample 4 between the upper end arc surfaces of the left vertical post 11 and the right vertical post 12, wherein the semi-cylindrical curved surface of the pressing block 2 is in contact with the strip-shaped sample 4;
S4, pressing a Probe (Probe) of a thermo-mechanical analyzer (TMA) against the plane of the pressing block 2, and pushing down the strip-shaped sample 4 by the pressing block 2 under the action of gravity of the pressing block 2 and downward pressure of the Probe, so that the strip-shaped sample 4 is tightly attached to an arc surface at the upper end of the left upright post 11, an arc surface at the upper end of the right upright post 12 and a semi-cylindrical curved surface of the pressing block 2;
S5, raising the temperature of a sample carrying table (Stage), after the strip-shaped sample 4 is heated and expanded, the pressing block 2 is stressed to move downwards, the probe moves downwards along with the pressing block, and the probe displacement is detected and recorded.
Preferably, the strip-shaped sample 4 is long enough, in the step S3, the strip-shaped sample 4 is tightly clung to the arc surface at the upper end of the left upright post 11, the arc surface at the upper end of the right upright post 12 and the semi-cylindrical curved surface of the press block 2 under the action of the gravity of the press block 2, and the plane of the press block is positioned below the circle center of the arc surface at the upper end of the left upright post 11 and the circle center of the arc surface at the upper end of the right upright post 12.
In the thermal test method of the fixture for testing a thermo-mechanical analyzer (TMA) of the sixth embodiment, the thermo-mechanical analyzer (TMA) has a probe and a sample stage for measuring compression, the sample and the fixture are placed on the sample stage, the surface contacting the strip-shaped sample 4 is a smooth and standard plane and curved surface, and the strip-shaped sample 4 is thermally tested by using the probe and the sample stage for measuring compression, so that an accurate thermal test result can be obtained.
Example seven
Based on the thermal test method of example six, the linear expansion coefficient α of the tape-like sample 4 is:
Wherein DeltaL is the length variation and unknown quantity of the strip sample; l is the original length of the sample, a known amount; delta T is the temperature variation, a known quantity; Δl0 is the effect after expansion of the clamp, an unknown amount; Δh is probe displacement, test amount; l0 is the length of the profile of the clamp that has an effect on the strip sample 4, a known amount; alpha 0 is the linear expansion coefficient of the clamp, a known quantity.
In an ideal case, let the thermal expansion coefficient of the materials used for the base 1 and the pressing block 2 be 0, α 0 =0, and the above formula can be simplified as:
In practice, the thermal expansion coefficient of the materials used for the base 1 and the compact 2 cannot be 0, and l0≡l, the above formula can be simplified as:
The calculation formula of the linear expansion coefficient α of the strip-shaped sample 4 may be built in the test processing software.
The thermal test method of the jig for Thermal Mechanical Analyzer (TMA) test of the seventh embodiment can test a more accurate linear thermal expansion coefficient of a strip sample in consideration of the thermal expansion coefficient of the jig material.
The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather to enable any modification, equivalent replacement, improvement or the like to be made within the spirit and principles of the utility model.
Claims (10)
1. The clamp for testing the thermo-mechanical analyzer is characterized by comprising a base (1), a pressing block (2) and two clamping blocks (3);
the base (1) is U-shaped and comprises a bottom cross column (10), a left vertical column (11) and a right vertical column (12);
The lower end of the left vertical post (11) is vertically fixed at the left end of the bottom transverse post (10);
the lower end of the right vertical post (12) is vertically fixed at the right end of the bottom transverse post (10);
The upper ends of the left vertical post (11) and the right vertical post (12) are arc surfaces with the same diameter;
The axis of the arc surface is in the front-back direction;
the left end of the arc surface at the upper end of the left vertical post (11) is tangent to the left side surface of the left vertical post (11);
the right end of the arc surface at the upper end of the right vertical post (12) is tangent to the right side surface of the right vertical post (12);
The radian of the arc surface is larger than 180 degrees;
w is less than or equal to D, D is the diameter of the arc surface, and W is the left-right width of the lower ends of the left vertical post (11) and the right vertical post (12);
The pressing block (2) is semi-cylindrical; d is more than or equal to 0.8S and less than or equal to S, the diameter of the d semi-cylinder is equal to the minimum distance between the two arc surfaces at the upper ends of the left vertical post (11) and the right vertical post (12);
The two clamping blocks (3) are used for being installed and fixed at the left end and the right end of the bottom transverse column (10), and the two ends of the strip-shaped sample (4) are respectively fixed at the left end and the right end of the bottom transverse column (10).
2. The jig for testing a thermo-mechanical analyzer according to claim 1, wherein,
The radian of the arc surface is more than 180 degrees and less than 270 degrees;
W≤D≤1.5W；
W is more than or equal to 0.1L and less than or equal to 0.3L, and L is the left and right length of the bottom transverse column (10).
3. The jig for testing a thermo-mechanical analyzer according to claim 1, wherein,
The left side surface of the left vertical post (11) is flush with the left end surface of the bottom transverse post (10);
the right side surface of the right vertical post (12) is flush with the right end surface of the bottom transverse post (10); or alternatively
The left side of the left vertical post (11) extends out from 0.1mm to 10mm to the left side of the left end face of the bottom cross post (10);
The right side of the right vertical post (12) extends out from 0.1mm to 10mm towards the right side of the right end face of the bottom cross post (10).
4. The jig for testing a thermo-mechanical analyzer according to claim 1, wherein,
The right end of the arc surface at the upper end of the left vertical column (11) is positioned on the right side surface of the left vertical column (11);
The left end of the arc surface at the upper end of the right vertical post (12) is positioned on the left side surface of the right vertical post (12).
5. The jig for testing a thermo-mechanical analyzer according to claim 1, wherein,
The distance from the right end of the arc surface at the upper end of the left vertical column (11) to the left end of the arc surface at the upper end of the right vertical column (12) to the upper side surface of the bottom cross column (10) is larger than d.
6. The jig for testing a thermo-mechanical analyzer according to claim 5, wherein,
d＝S。
7. The jig for testing a thermo-mechanical analyzer according to claim 1, wherein,
The axial line of the arc surface at the upper end of the left vertical column (11) and the axial line of the arc surface at the upper end of the right vertical column (12) are equal in distance to the upper side surface of the bottom transverse column (10).
8. The jig for testing a thermo-mechanical analyzer according to claim 1, wherein,
Two through holes are formed on each clamping block (3);
Two screw holes are correspondingly formed at the left end of the bottom transverse column (10);
two screw holes are correspondingly formed at the right end of the bottom transverse column (10);
Bolts penetrate through holes of the clamping blocks (3) to be fixed to screw holes at the left end and the right end of the bottom transverse column (10) in a threaded fit mode, the two clamping blocks (3) are installed and fixed to the left end and the right end of the bottom transverse column (10), and two ends of the strip-shaped sample (4) are respectively fixed to the left end and the right end of the bottom transverse column (10).
9. The jig for testing a thermo-mechanical analyzer according to claim 1, wherein,
The base (1) and the pressing block (2) are made of the same material.
10. The jig for testing a thermo-mechanical analyzer according to claim 1, wherein,
The thermal expansion coefficients of the materials of the base (1) and the pressing block (2) are smaller than those of the strip-shaped sample (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322478561.XU CN221100275U (en) | 2023-09-13 | 2023-09-13 | Clamp for testing thermomechanical analyzer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322478561.XU CN221100275U (en) | 2023-09-13 | 2023-09-13 | Clamp for testing thermomechanical analyzer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN221100275U true CN221100275U (en) | 2024-06-07 |
Family
ID=91311240
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322478561.XU Active CN221100275U (en) | 2023-09-13 | 2023-09-13 | Clamp for testing thermomechanical analyzer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN221100275U (en) |
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2023
- 2023-09-13 CN CN202322478561.XU patent/CN221100275U/en active Active
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