CN117092158A - Thermal expansion coefficient detection equipment and detection method - Google Patents
Thermal expansion coefficient detection equipment and detection method Download PDFInfo
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- CN117092158A CN117092158A CN202311067442.3A CN202311067442A CN117092158A CN 117092158 A CN117092158 A CN 117092158A CN 202311067442 A CN202311067442 A CN 202311067442A CN 117092158 A CN117092158 A CN 117092158A
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- 238000001514 detection method Methods 0.000 title claims abstract description 21
- 238000005485 electric heating Methods 0.000 claims abstract description 17
- 239000000463 material Substances 0.000 claims abstract description 16
- 238000001816 cooling Methods 0.000 claims description 7
- 230000008878 coupling Effects 0.000 claims description 3
- 238000010168 coupling process Methods 0.000 claims description 3
- 238000005859 coupling reaction Methods 0.000 claims description 3
- 230000008859 change Effects 0.000 claims description 2
- 238000000034 method Methods 0.000 claims description 2
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/16—Investigating or analyzing materials by the use of thermal means by investigating thermal coefficient of expansion
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
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- General Health & Medical Sciences (AREA)
- Immunology (AREA)
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- Investigating Or Analyzing Materials Using Thermal Means (AREA)
Abstract
The present invention provides a thermal expansion coefficient detecting apparatus comprising: the device comprises a box body and a test bench, wherein the test bench is arranged in the box body, a placing groove is formed in the top end of the test bench, and a laser ranging sensor and an electric heating sheet are arranged on the inner wall of the box body. A detection method is suitable for the thermal expansion coefficient detection equipment, and comprises the following steps: firstly, placing a material to be tested on a placing groove, and changing the environmental temperature in a box body through an electric heating plate; measuring the size variation of the material to be measured by using a laser ranging sensor, and transmitting the data to a processor; and thirdly, after the processor calculates the data, displaying the expansion coefficient of the material to be measured through a display. The electric heating sheet can heat the environmental temperature in the box body to the required temperature, then the deformation quantity of the sample to be measured is measured through the laser ranging sensor, the expansion coefficient of the sample to be measured is calculated through the processor, the laser ranging sensor can measure samples with different sizes, and the measuring range is large.
Description
Technical Field
The invention belongs to the technical field of detection, and particularly relates to thermal expansion coefficient detection equipment and a detection method.
Background
The expansion coefficient is a physical quantity representing the thermal expansion property of an object, i.e. the physical quantity representing the degree of increase in length, area and volume of the object when the object is heated. The study of expansion coefficients is widely used in various fields including refractory materials, building materials, glass, metals, plastics, and the like. Such as a kiln built at normal temperature, and the furnace body expands when used at high temperature. To counteract the stress caused by thermal expansion, expansion joints are reserved. For example, the blank and the glaze of the ceramic product have attractive effect due to reasonable expansion coefficient ratio, and the product is cracked or deformed due to unreasonable expansion coefficient ratio. The thermal expansion coefficient of the material has important research significance for composite materials manufactured at high temperature.
Patent publication No. CN114965554 a discloses a thermal expansion coefficient detecting device and a method for detecting thermal expansion coefficient of a light aggregate water-stable layer using the same, the thermal expansion coefficient detecting device comprising: the constant temperature device is provided with a cavity for containing the sample, the axial deformation detection device is used for detecting the axial deformation of the sample, and the radial deformation detection device is used for detecting the radial deformation of the sample. Through detecting the axial deformation and the radial deformation of the sample, the thermal expansion coefficient detection equipment can obtain the thermal expansion coefficient of the sample, a plurality of samples are selected at different positions of the light aggregate water stabilization layer, the thermal expansion coefficient of each sample is detected by the thermal expansion coefficient detection equipment, and the obtained thermal expansion coefficient data is processed, so that the thermal expansion coefficient of the light aggregate water stabilization can be obtained.
However, the above-mentioned patent has the following disadvantages in the actual use, and the expansion coefficient of the material is detected by the strain gauge, and since the position of the strain gauge cannot be adjusted, only the material with a fixed size can be detected, and the measuring range is small.
Disclosure of Invention
Therefore, the invention aims to solve the problems that the position of the strain gauge in the prior art can not be adjusted, only materials with fixed sizes can be detected, and the measuring range is small.
Therefore, the technical scheme adopted is that the thermal expansion coefficient detection equipment comprises: the device comprises a box body and a test bench, wherein the test bench is arranged in the box body, a placing groove is formed in the top end of the test bench, and a laser ranging sensor and an electric heating sheet are arranged on the inner wall of the box body.
Preferably, the inner wall of the box body is provided with a processor and a temperature sensor, the outer wall of the box body is provided with a display, and the laser ranging sensor, the electric heating sheet, the temperature sensor and the display are electrically connected with the processor.
Preferably, the bottom end of the box body is provided with a base.
Preferably, the upper end of the box body is provided with an air inlet, and the lower end of the box body is provided with an air outlet.
Preferably, the outer wall of the box body is provided with a box door.
Preferably, the test bench below is provided with the headstock, first pivot one end is connected with the test bench bottom, first pivot other end extends to the headstock in with first bevel gear coaxial coupling, first pivot is connected with the headstock top wall rotation, be provided with first supporting shoe in the headstock, first supporting shoe is connected with the headstock inner wall, the second pivot passes first supporting shoe to rotate with first supporting shoe and be connected, second pivot one end and second bevel gear coaxial coupling, first bevel gear and second bevel gear meshing, the second pivot other end is connected with the hemisphere shell.
Preferably, four semicircular grooves are formed in the end face of the hemispherical shell at intervals, an arc-shaped sliding groove is formed between every two adjacent semicircular grooves, a first motor is arranged in the power box, an output shaft of the first motor is connected with a circular plate, a semicircular sliding sleeve is arranged on the circular plate and matched with the semicircular grooves, the end face of the semicircular sliding sleeve is connected with one end of a connecting rod, the other end of the connecting rod is connected with a sliding column, and the sliding column can slide in the arc-shaped sliding groove.
Preferably, the air cooling device is further included, and the air cooling device includes: the device comprises an internal gear, a second motor, a third rotating shaft, a crank and a first gear, wherein the internal gear is arranged at the top of the inner wall of the box body, the second motor is arranged at the center of the circle of the internal gear, an output shaft of the second motor is coaxially connected with one end of the third rotating shaft, the third rotating shaft is connected with one end of the crank, the other end of the crank is rotationally connected with the first gear, the internal gear is meshed with the first gear, the other end of the third rotating shaft penetrates through one end of the rotating plate, and the third rotating shaft is rotationally connected with the rotating plate.
Preferably, a guide groove extending along the length direction is formed in the rotating plate, a sliding block is connected in the guide groove in a sliding mode, one end of the rotating rod is connected with the gear away from the center of the circle on one side of the crank, the fourth rotating shaft penetrates through the sliding block and is rotationally connected with the sliding block, one end of the fourth rotating shaft is vertically connected with the other end of the rotating rod, the other end of the fourth rotating shaft is coaxially connected with the second gear, one end of the fifth rotating shaft is rotationally connected with the sliding block, a third gear is coaxially arranged on the fifth rotating shaft, the second gear is meshed with the third gear, the other end of the fifth rotating shaft is connected with the fan, and the fan is located above the test board.
A detection method is suitable for the thermal expansion coefficient detection equipment, and comprises the following steps:
firstly, placing a material to be tested on a placing groove, and changing the environmental temperature in a box body through an electric heating plate;
measuring the size variation of the material to be measured by using a laser ranging sensor, and transmitting the data to a processor;
and thirdly, after the processor calculates the data, displaying the expansion coefficient of the material to be measured through a display.
The technical scheme of the invention has the following advantages: the present invention provides a thermal expansion coefficient detecting apparatus comprising: the device comprises a box body and a test bench, wherein the test bench is arranged in the box body, a placing groove is formed in the top end of the test bench, and a laser ranging sensor and an electric heating sheet are arranged on the inner wall of the box body. The electric heating sheet can heat the environment temperature in the box body to the required temperature, then the deformation quantity of the sample to be measured is measured through the laser ranging sensor, the expansion coefficient of the sample to be measured is calculated through the processor, and the expansion coefficient value is displayed through the display. The laser ranging sensor can measure samples with different sizes, and the measuring range is large.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and drawings.
The technical scheme of the invention is further described in detail through the drawings and the embodiments.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate the invention and together with the embodiments of the invention, serve to explain the invention. In the drawings:
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a schematic view of the structure of the base and the door of the present invention;
FIG. 3 is a schematic view of the structure of the hemispherical shell, the half sliding sleeve and the sliding column according to the present invention;
FIG. 4 is a schematic diagram of an air cooling device according to the present invention;
FIG. 5 is a schematic diagram of a fifth shaft and a fan according to the present invention;
the device comprises a 1-box body, a 2-test bench, a 3-placing groove, a 4-laser ranging sensor, a 5-electric heating plate, a 6-processor, a 7-temperature sensor, an 8-display, a 9-base, a 10-air inlet, an 11-air outlet, a 12-box door, a 13-power box, a 14-first rotating shaft, a 15-first bevel gear, a 16-first supporting block, a 17-second rotating shaft, a 18-second bevel gear, a 19-hemispherical shell, a 20-semicircular groove, a 21-arc-shaped sliding groove, a 22-first motor, a 23-circular plate, a 24-semi-sliding sleeve, a 25-connecting rod, a 26-sliding column, a 27-internal gear, a 28-second motor, a 29-third rotating shaft, a 30-crank, a 31-first gear, a 32-guiding groove, a 33-sliding block, a 34-rotating rod, a 35-fourth rotating shaft, a 36-second gear, a 37-fifth rotating shaft, a 38-third gear, a 39-fan and a 40-rotating plate.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects to be solved more clear, the invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
It will be understood that when an element is referred to as being "mounted" or "disposed" on another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly or indirectly connected to the other element.
It is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are merely for convenience in describing and simplifying the description based on the orientation or positional relationship shown in the drawings, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus are not to be construed as limiting the invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
The present invention provides a thermal expansion coefficient detecting apparatus, as shown in fig. 1-2, comprising: the test box comprises a box body 1 and a test board 2, wherein the test board 2 is arranged in the box body 1, a placing groove 3 is formed in the top end of the test board 2, and a laser ranging sensor 4 and an electric heating sheet 5 are arranged on the inner wall of the box body 1. The inner wall of the box body 1 is provided with a processor 6 and a temperature sensor 7, the outer wall of the box body 1 is provided with a display 8, and the laser ranging sensor 4, the electric heating sheet 5, the temperature sensor 7 and the display 8 are electrically connected with the processor 6. The bottom of the box body 1 is provided with a base 9 which plays a supporting role. The upper end of the box body 1 is provided with an air inlet 10, and the lower end of the box body 1 is provided with an air outlet 11 for keeping air circulation. The outer wall of the box body 1 is provided with a box door 12 which is convenient for opening, taking and placing samples to be measured.
The technical scheme has the working principle and beneficial technical effects that: placing a sample to be measured in the placing groove 3, starting the electric heating plate 5, heating the environment temperature in the box body 1 to a required temperature, measuring the deformation quantity of the sample to be measured through the laser ranging sensor 4, calculating the expansion coefficient of the sample to be measured through the processor 6, and displaying the expansion coefficient value through the display 8. The laser ranging sensor 4 can measure samples with different sizes, and the measuring range is large.
In one embodiment, as shown in fig. 1-3, a power box 13 is arranged below the test bench 2, one end of a first rotating shaft 14 is connected with the bottom end of the test bench 2, the other end of the first rotating shaft 14 extends into the power box 13 and is coaxially connected with a first bevel gear 15, the first rotating shaft 14 is rotatably connected with the top wall of the power box 13, a first supporting block 16 is arranged in the power box 13, the first supporting block 16 is connected with the inner wall of the power box 13, a second rotating shaft 17 passes through the first supporting block 16 and is rotatably connected with the first supporting block 16, one end of the second rotating shaft 17 is coaxially connected with a second bevel gear 18, the first bevel gear 15 is meshed with the second bevel gear 18, and the other end of the second rotating shaft 17 is connected with a hemispherical shell 19.
Four semicircular grooves 20 are formed in the end face of the hemispherical shell 19 at intervals, arc-shaped sliding grooves 21 are formed between every two adjacent semicircular grooves 20, a first motor 22 is arranged in the power box 13, an output shaft of the first motor 22 is connected with a circular plate 23, a semicircular sliding sleeve 24 is arranged on the circular plate 23, the semicircular sliding sleeve 24 is matched with the semicircular grooves 20, the end face of the semicircular sliding sleeve 24 is connected with one end of a connecting rod 25, the other end of the connecting rod 25 is connected with a sliding column 26, and the sliding column 26 can slide in the arc-shaped sliding grooves 21.
The technical scheme has the working principle and beneficial technical effects that: the first motor 22 is started to drive the half sliding sleeve 24 and the sliding column 26 to rotate, when the half sliding sleeve 24 slides in the semicircular groove 20, the half spherical shell 19 is kept static, when the sliding column 26 slides in the arc-shaped sliding groove 21, the half spherical shell 19 is driven to rotate 90 degrees, so that the half spherical shell 19 drives the second rotating shaft 17 to intermittently rotate, the first bevel gear 15 is meshed with the second bevel gear 18, the sample to be measured is correspondingly driven to accurately rotate for 90 degrees at intervals, and when the sample to be measured is stopped, the expansion coefficient of the sample to be measured is measured so as to measure different positions of the sample for multiple times, and the precision of measuring the expansion coefficient is higher.
In one embodiment, as shown in fig. 4-5, the air cooling device further comprises an air cooling device, wherein the air cooling device comprises: the inner gear 27 is arranged at the top of the inner wall of the box body 1, the second motor 28 is arranged at the center of the circle of the inner gear 27, an output shaft of the second motor 28 is coaxially connected with one end of the third rotating shaft 29, the third rotating shaft 29 is connected with one end of the crank 30, the other end of the crank 30 is rotationally connected with the first gear 31, the inner gear 27 is meshed with the first gear 31, the other end of the third rotating shaft 29 penetrates through one end of the rotating plate 40, and the third rotating shaft 29 is rotationally connected with the rotating plate 40.
The rotating plate 40 is provided with a guide groove 32 extending along the length direction, the guide groove 32 is connected with a sliding block 33 in a sliding way, one end of a rotating rod 34 is connected with the center of a circle on one side, far away from the crank 30, of a gear 31, a fourth rotating shaft 35 penetrates through the sliding block 33 and is rotationally connected with the sliding block 33, one end of the fourth rotating shaft 35 is vertically connected with the other end of the rotating rod 34, the other end of the fourth rotating shaft 35 is coaxially connected with a second gear 36, one end of a fifth rotating shaft 37 is rotationally connected with the sliding block 33, a third gear 38 is coaxially arranged on the fifth rotating shaft 37, the second gear 36 is meshed with the third gear 38, the other end of the fifth rotating shaft 37 is connected with a fan 39, and the fan 39 is positioned above the test bench 2.
The technical scheme has the working principle and beneficial technical effects that: when the sample to be measured needs to be cooled, the second motor 28 is started to drive the crank 30 to rotate, the gear 31 is driven to rotate around the axis of the internal gear 27 through the meshing of the gear 31 and the internal gear 27, the gear 31 also rotates around the axis of the gear 31, the rotating rod 34 is driven to rotate by the gear 31, the sliding rod 34 drives the sliding block 33 to slide back and forth in the guide groove 32 and drives the rotating plate 40 to rotate around the third rotating shaft 29, meanwhile, the rotating rod 34 drives the fourth rotating shaft 35 to rotate relative to the sliding block 33, the fourth rotating shaft 35 drives the second gear 36 to rotate, the second gear 36 is meshed with the third gear 38 to drive the third gear 38 to rotate, the third gear 38 drives the fifth rotating shaft 37 and the fan 39 to rotate together with the rotating plate 40, and meanwhile, the sliding block 33 continuously moves back and forth along the radial direction to scan and blow air around the sample, and the sample is cooled rapidly.
A detection method is suitable for the thermal expansion coefficient detection equipment, and comprises the following steps:
firstly, placing a material to be tested on a placing groove 3, and changing the ambient temperature in a box body 1 through an electric heating plate 5;
step two, measuring the dimensional change of the material to be measured by using a laser ranging sensor 4, and transmitting data to a processor 6;
and thirdly, after the processor 6 calculates the data, displaying the expansion coefficient of the material to be tested through the display 8.
The technical scheme has the working principle and beneficial technical effects that: the electric heating sheet 5 can heat the environment temperature in the box body 1 to a required temperature, then the deformation quantity of the sample to be measured is measured through the laser ranging sensor 4, the expansion coefficient of the sample to be measured is calculated through the processor 6, and the expansion coefficient value is displayed through the display 8. The laser ranging sensor 4 can measure samples with different sizes, and the measuring range is large.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (10)
1. A thermal expansion coefficient detecting apparatus, characterized by comprising: the device comprises a box body (1) and a test table (2), wherein the test table (2) is arranged in the box body (1), a placing groove (3) is formed in the top end of the test table (2), and a laser ranging sensor (4) and an electric heating sheet (5) are arranged on the inner wall of the box body (1).
2. The thermal expansion coefficient detection device according to claim 1, wherein the processor (6) and the temperature sensor (7) are arranged on the inner wall of the box body (1), the display (8) is arranged on the outer wall of the box body (1), and the laser ranging sensor (4), the electric heating sheet (5), the temperature sensor (7) and the display (8) are electrically connected with the processor (6).
3. A thermal expansion coefficient detecting apparatus according to claim 1, wherein the bottom end of the case (1) is provided with a base (9).
4. A thermal expansion coefficient detecting apparatus according to claim 1, wherein the upper end of the housing (1) is provided with an air inlet (10), and the lower end of the housing (1) is provided with an air outlet (11).
5. A thermal expansion coefficient detecting apparatus according to claim 1, wherein a door (12) is provided on an outer wall of the case (1).
6. A thermal expansion coefficient detection device according to claim 1, characterized in that a power box (13) is arranged below the test bench (2), one end of a first rotating shaft (14) is connected with the bottom end of the test bench (2), the other end of the first rotating shaft (14) extends into the power box (13) to be coaxially connected with a first bevel gear (15), the first rotating shaft (14) is rotatably connected with the top wall of the power box (13), a first supporting block (16) is arranged in the power box (13), the first supporting block (16) is connected with the inner wall of the power box (13), a second rotating shaft (17) penetrates through the first supporting block (16) and is rotatably connected with the first supporting block (16), one end of the second rotating shaft (17) is coaxially connected with a second bevel gear (18), the first bevel gear (15) is meshed with the second bevel gear (18), and the other end of the second rotating shaft (17) is connected with a hemispherical shell (19).
7. The thermal expansion coefficient detection device according to claim 6, wherein four semicircular grooves (20) are formed in the end face of the hemispherical shell (19) at intervals, arc-shaped sliding grooves (21) are formed between every two adjacent semicircular grooves (20), a first motor (22) is arranged in the power box (13), an output shaft of the first motor (22) is connected with a circular plate (23), a semicircular sliding sleeve (24) is arranged on the circular plate (23), the semicircular sliding sleeve (24) is matched with the semicircular grooves (20), the end face of the semicircular sliding sleeve (24) is connected with one end of a connecting rod (25), the other end of the connecting rod (25) is connected with a sliding column (26), and the sliding column (26) can slide in the arc-shaped sliding grooves (21).
8. The apparatus for detecting a thermal expansion coefficient according to claim 1, further comprising an air cooling device comprising: internal gear (27), second motor (28), third pivot (29), crank (30) and first gear (31), box (1) inner wall top is provided with internal gear (27), internal gear (27) centre of a circle department is provided with second motor (28), second motor (28) output shaft and third pivot (29) one end coaxial coupling, third pivot (29) are connected with crank (30) one end, crank (30) other end and first gear (31) rotate and are connected, internal gear (27) and first gear (31) meshing, third pivot (29) other end passes rotating plate (40) one end, third pivot (29) are connected with rotating plate (40) rotation.
9. The thermal expansion coefficient detecting apparatus according to claim 8, wherein a guide groove (32) extending in a longitudinal direction is provided on the rotating plate (40), a slider (33) is slidably connected to the guide groove (32), one end of the rotating rod (34) is connected to a center of a circle of a side of the gear (31) away from the crank (30), a fourth rotating shaft (35) penetrates through the slider (33) and is rotatably connected to the slider (33), one end of the fourth rotating shaft (35) is vertically connected to the other end of the rotating rod (34), the other end of the fourth rotating shaft (35) is coaxially connected to the second gear (36), one end of the fifth rotating shaft (37) is rotatably connected to the slider (33), a third gear (38) is coaxially provided on the fifth rotating shaft (37), the second gear (36) is meshed with the third gear (38), the other end of the fifth rotating shaft (37) is connected to the fan (39), and the fan (39) is located above the test bench (2).
10. A method of detecting a thermal expansion coefficient, suitable for use in the apparatus of any one of claims 1 to 9, comprising the steps of:
firstly, placing a material to be tested on a placing groove (3), and changing the ambient temperature in a box body (1) through an electric heating sheet (5);
measuring the dimensional change of the material to be measured by using a laser ranging sensor (4), and transmitting data to a processor (6);
and thirdly, after the processor (6) calculates the data, displaying the expansion coefficient of the material to be tested through the display (8).
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| CN202311067442.3A CN117092158A (en) | 2023-08-23 | 2023-08-23 | Thermal expansion coefficient detection equipment and detection method |
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| CN202311067442.3A CN117092158A (en) | 2023-08-23 | 2023-08-23 | Thermal expansion coefficient detection equipment and detection method |
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