A tool and method for calibrating a dual measuring arm high temperature extensometer

Abstract

The application discloses a kind of tool and method for double measuring arm high temperature extensometer calibration, belong to the calibration technical field of double measuring arm high temperature extensometer, tool includes: rack, standard displacement generating device, simulation sample group;Simulation sample group includes first die and second simulation sample, standard displacement generating device drives second simulation sample relative to first simulation sample and moves along longitudinal direction;First simulation sample is provided with first mounting part for installing upper measuring arm, and second simulation sample is provided with second mounting part for installing lower measuring arm;Upper and lower measuring arm is respectively rolled with rack, and elastic connecting piece is connected between upper and lower measuring arm;Detection component is set to lower measuring arm and cooperates with adjusting component, to detect the relative displacement between upper and lower measuring arm.The application can improve the defect that only calibrates sensor and ignores measuring arm error, realize reliable overall calibration including measuring arm, and tool is portable, can be operated on site.

Description

Technical Field

[0001] The present invention belongs to the technical field of verification for double-measurement-arm high-temperature extensometers, and specifically relates to a tooling and method for verifying a double-measurement-arm high-temperature extensometer. Background Art

[0002] At present, commonly used extensometers are composed of arms, cutting edges, elastic bodies, strain gauges, clamping springs and the like. When measuring the deformation of a test specimen, the extensometer is directly clamped on the test specimen, with the two cutting edges in contact with the test specimen. When the test specimen deforms under force, the distance between the two cutting edges changes accordingly, causing the elastic body to deform via the arms, and the strain gauges attached to the elastic body generate a change in electrical signal, which is used to measure the deformation of the test specimen. This type of extensometer is mainly applied to measure the deformation of test specimens at normal temperature, and is not suitable for deformation measurement at high temperatures.

[0003] A double-measurement-arm high-temperature extensometer is generally used to measure the deformation of a test specimen under force at high temperature. The test specimen is installed in a high-temperature furnace chamber, two long measurement arms are adopted, one end of each long measurement arm is connected to the upper and lower gauge length measurement points of the test specimen, and the other end is led out of the high-temperature furnace and connected to a displacement sensor. Another displacement sensor is led out in the same manner at the symmetrical orientation of the test specimen. When the test specimen deforms, the two measurement arms on the same side move relatively, driving the displacement sensor to deform, so as to realize the measurement of the deformation of the test specimen. Due to the structural difference between this double-measurement-arm high-temperature extensometer and common extensometers, the extensometer verification regulations do not specify a verification method for this type of extensometer. Currently, a method of separately verifying the two displacement sensors is mostly adopted, that is, as long as each displacement sensor is qualified, the entire set of double-measurement-arm high-temperature extensometer is considered qualified. This method does not take into account the error factors introduced by the machining geometric dimension differences of the measurement arms and the installation method, nor does it take into account the error factors caused by the deformation of the measurement arms after being subjected to high temperature. The method of judging whether the extensometer is qualified only by verifying the displacement sensors is debatable, and there are hidden quality and safety risks. On the whole, in the current verification of extensometers, the two displacement sensors are generally verified separately, without fully considering the influences of measurement arm machining differences, installation errors and high-temperature deformation. Summary of the Invention

[0004] The present invention provides a tooling and method for verifying a double-measurement-arm high-temperature extensometer, aiming to solve the problem that in current extensometer verification, the two displacement sensors are generally verified separately, without fully considering the influences of measurement arm machining differences, installation errors and high-temperature deformation.

[0005] To achieve the above objective, the present invention adopts the following technical solutions: This invention provides a fixture for calibrating a dual-arm high-temperature extensometer. The dual-arm high-temperature extensometer includes an upper measuring arm, a lower measuring arm, an elastic connector, a detection assembly, and an adjustment assembly. The fixture includes a frame, a standard displacement generating device, and a set of simulated samples. A standard displacement generating device is mounted on the frame; the simulated sample group includes a first simulated sample and a second simulated sample. The first simulated sample is connected to the frame, and the output end of the standard displacement generating device passes through the first simulated sample and is connected to the second simulated sample. The standard displacement generating device drives the second simulated sample to move longitudinally relative to the first simulated sample. The first simulated sample is provided with a first mounting part for mounting the upper measuring arm, and the second simulated sample is provided with a second mounting part for mounting the lower measuring arm. The upper measuring arm is mounted on the first mounting part, and the lower measuring arm is mounted on the second mounting part. The upper and lower measuring arms are respectively rolled in cooperation with the frame, and the elastic connecting piece is connected between the upper and lower measuring arms. The detection component is set on the lower measuring arm and cooperates with the adjustment component to detect the relative displacement between the upper and lower measuring arms.

[0006] In some embodiments, the frame includes a crossbeam, a guide column, and a base. The crossbeam is located at the upper end of the guide column, and the base is located at the lower end of the guide column. A standard displacement generating device is located on the crossbeam, and the upper measuring arm and the lower measuring arm are respectively in rolling engagement with the guide column.

[0007] Furthermore, the standard displacement generating device is a micrometer head, which includes a fixed shaft and a moving shaft. The fixed shaft constitutes the fixed end of the standard displacement generating device and is connected to the crossbeam, while the moving shaft constitutes the output end. The fixed shaft is connected to the crossbeam, the first simulated sample is set as a hollow structure, and the moving shaft passes through the through hole of the first simulated sample and is connected to the second simulated sample.

[0008] Furthermore, the calibration fixture also includes a second nut and a third nut. The upper end of the first simulated sample is connected to the crossbeam by a thread and fastened by the second nut. The lower end of the moving shaft is connected to the upper end of the second simulated sample by a thread and fastened by the third nut.

[0009] Furthermore, the lower end of the second simulated sample is inserted into the guide hole of the guide column and can move freely longitudinally within the guide hole; the opposite sides of the guide column form guide rail surfaces, and the dual-arm high-temperature extensometer also includes a first guide roller and a second guide roller. The first guide roller is disposed on the upper measuring arm, and the second guide roller is disposed on the lower measuring arm. The first guide roller and the second guide roller respectively roll into contact with two planes.

[0010] In some embodiments, the first mounting part and the second mounting part are respectively raised V-shaped steps, and the upper measuring arm and the lower measuring arm are respectively provided with recessed V-shaped grooves. The geometric dimensions of the raised V-shaped steps are the same as the geometric dimensions of the recessed V-shaped grooves.

[0011] In some embodiments, the calibration fixture further includes a first retaining ring and a second retaining ring, with two upper measuring arms mounted at an angle to the first mounting part and secured by the first retaining ring, and two lower measuring arms mounted at an angle to the second mounting part and secured by the second retaining ring.

[0012] In some embodiments, the elastic connector is a spring, and the number of springs is set to two; the two springs are respectively connected between the two upper measuring arms and the two lower measuring arms so as to pull the two upper measuring arms and the two lower measuring arms together to form a whole.

[0013] In some embodiments, the adjustment assembly includes an adjustable screw and a first nut. The adjustable screw is disposed at the lower end of the upper measuring arm, and the first nut cooperates with the adjustable screw to lock the adjustable screw. The detection assembly is a sensor, which is installed in a mounting hole at the lower end of the lower measuring arm, and the moving rod of the sensor abuts against the top of the adjustable screw. The calibration fixture also includes a first screw, through which the sensor is fastened to the mounting hole.

[0014] The present invention also provides a method for calibrating a dual-arm high-temperature extensometer, which is based on the above-mentioned tooling for calibrating a dual-arm high-temperature extensometer, and includes the following steps: The upper measuring arm is installed on the first mounting part, the lower measuring arm is installed on the second mounting part, and the elastic connector is connected between the upper measuring arm and the lower measuring arm. Install the detection component onto the lower measuring arm and adjust the detection component so that it mates with the adjustment component of the upper measuring arm; Set the reading of the standard displacement generator to zero and the reading of the detection component to zero; operate the standard displacement generator to drive the second simulated sample to move a given displacement relative to the first simulated sample in the longitudinal direction through the output terminal, record the standard displacement value output by the standard displacement generator, and at the same time record the relative displacement between the upper and lower measuring arms detected by the detection component. Calculate the indication error of the dual-arm high-temperature extensometer based on the standard displacement value and relative displacement.

[0015] Compared with the prior art, the tooling and method for calibrating a dual-arm high-temperature extensometer of the present invention have the following advantages: This invention constructs a calibration fixture capable of simulating the actual working state of a dual-arm high-temperature extensometer. A first simulated sample is connected to the frame. The output end of a standard displacement generator passes through the first simulated sample and connects to a second simulated sample, enabling the standard displacement generator to drive the second simulated sample to move longitudinally relative to the first simulated sample, thereby simulating the tensile deformation of the gauge length section of the sample under stress. The upper measuring arm is mounted on a first mounting part, and the lower measuring arm is mounted on a second mounting part, allowing the two measuring arms to move relative to the first and second simulated samples respectively. A detection component is located on the lower measuring arm and cooperates with the adjustment component of the upper measuring arm, enabling direct detection of the relative displacement. During calibration, the fixture treats the upper and lower measuring arms, the elastic connector, the detection component, and the adjustment component as a single measurement system. The measured relative displacement comprehensively reflects the influence of differences in the machining geometry of the measuring arms, installation errors, and the cooperation state of each component on the measurement results. This improves upon the errors caused by calibrating only the displacement sensor in existing technologies while ignoring mechanical structural factors such as the measuring arms, enabling relatively effective calibration of the dual-arm high-temperature extensometer and improving the authenticity and reliability of the calibration results. Meanwhile, the calibration operation can be completed on-site without having to remove the extensometer from the testing machine and send it to the laboratory, which improves the convenience and efficiency of calibration. Attached Figure Description

[0016] The accompanying drawings are provided to further understand the invention and constitute a part of this invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0017] Figure 1 This is a schematic diagram of the tooling for calibrating a dual-arm high-temperature extensometer according to the present invention; Figure 2 This is a schematic diagram of the use and installation of the extensometer in an embodiment of a tooling for calibrating a dual-measuring-arm high-temperature extensometer according to the present invention. Figure 3 This is a schematic diagram of the structure of the measuring arm on the extensometer in an embodiment of a tooling for calibrating a dual-measuring-arm high-temperature extensometer according to the present invention. Figure 4 This is a schematic diagram of the lower measuring arm structure of the extensometer in an embodiment of a tooling for calibrating a dual-measuring-arm high-temperature extensometer according to the present invention.

[0018] Among them, 1. First connector, 2. First V-groove, 3. First guide roller, 4. First straight pin, 5. Adjustable screw, 6. First nut, 7. Second connector, 8. Second V-groove, 9. Second guide roller, 10. Mounting hole, 11. Second straight pin; 12. Upper pull rod, 13. Heating furnace, 14. Sample, 15. First retaining ring, 16. Upper measuring arm, 17. Second retaining ring, 18. Lower measuring arm, 19. Lower pull rod, 20. Spring, 21. Sensor, 22. First screw, 23. Micrometer head, 24. Fixed shaft, 25. Crossbeam, 26. Simulated sample, 27. Second nut, 28. Moving shaft, 29. Third nut, 30. Second simulated sample, 31. Guide column, 32. Base, 33. Second screw. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0021] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0022] It should be noted that the apparatus and methods disclosed in the embodiments herein can also be implemented in other ways. The apparatus embodiments described above are merely illustrative; for example, the flowcharts and block diagrams in the accompanying drawings show the architecture, functionality, and operation of possible implementations of apparatus, methods, and computer program products according to various embodiments herein. In this regard, each block in a flowchart or block diagram may represent a module, program, or part of code containing one or more executable instructions for implementing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the blocks may occur in a different order than those marked in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in a block diagram and / or flowchart, and combinations of blocks in block diagrams and / or flowcharts, can be implemented using a dedicated hardware-based system to perform the specified function or action, or can be implemented using a combination of dedicated hardware and computer instructions.

[0023] In addition, the functional modules in the various embodiments of this article can be integrated together to form an independent part, or each module can exist independently, or two or more modules can be integrated to form an independent part.

[0024] Based on the structural characteristics of the dual-arm high-temperature extensometer, how to simulate its working state, design a calibration method for the dual-arm high-temperature extensometer, and design a dedicated calibration fixture based on the calibration method to verify its readings.

[0025] Based on this, such as Figure 1 As shown, this invention provides a fixture for calibrating a dual-arm high-temperature extensometer. The dual-arm high-temperature extensometer includes an upper measuring arm 16, a lower measuring arm 18, an elastic connector, a detection assembly, and an adjustment assembly. The fixture includes a frame, a standard displacement generating device, and a set of simulated samples. Wherein: A standard displacement generating device is mounted on the frame; the simulated sample group includes a first simulated sample 26 and a second simulated sample 30. The first simulated sample 26 is connected to the frame, and the output end of the standard displacement generating device passes through the first simulated sample 26 and is connected to the second simulated sample 30. The standard displacement generating device drives the second simulated sample 30 to move longitudinally relative to the first simulated sample 26. The first simulated sample 26 is provided with a first mounting part for mounting the upper measuring arm 16, and the second simulated sample 30 is provided with a second mounting part for mounting the lower measuring arm 18. The upper measuring arm 16 is mounted on the first mounting part, and the lower measuring arm 18 is mounted on the second mounting part. The upper measuring arm 16 and the lower measuring arm 18 are respectively rolled in cooperation with the frame. An elastic connecting member is connected between the upper measuring arm 16 and the lower measuring arm 18. The detection component is set on the lower measuring arm 18 and cooperates with the adjustment component to detect the relative displacement between the upper measuring arm 16 and the lower measuring arm 18.

[0026] This invention is used for the calibration of a dual-arm high-temperature extensometer, verifying whether its technical specifications meet the requirements for use. The dual-arm high-temperature extensometer is mainly used in high-temperature creep and endurance strength testing machines to measure the relationship between the deformation of a specimen and the test force under high-temperature conditions. The fixture of this invention is compact and portable, and can be applied on-site for the calibration of the dual-arm high-temperature extensometer. The micrometer head 23 is coaxial with the main shaft of the simulated specimen. Through the transmission mechanism of the micrometer cylinder, it drives the relative movement of the upper and lower gauge measurement points of the simulated specimen, simulating the stress-deformation principle of the specimen, which conforms to Abbe's principle. It enables the overall calibration of the extensometer, considering both the accuracy of the sensor 21 and the influence of the measuring arms on the measurement results.

[0027] In some operating conditions, this invention uses a frame consisting of a crossbeam 25, a guide column 31, and a base 32. A standard displacement generating device is mounted on the crossbeam 25. The upper measuring arm 16 and the lower measuring arm 18 roll in cooperation with the guide column 31, providing a stable support structure for the tooling and ensuring the guiding accuracy of the measuring arm's movement relative to the guide column 31. The moving shaft 28 of the micrometer head 23 can directly drive the second simulated sample 30 to generate precise longitudinal displacement, ensuring high accuracy and high resolution of the standard displacement value and providing a benchmark for subsequent calculation of indication errors. The lower end of the second simulated sample 30 is inserted into the guide hole of the guide column 31 and can move freely. The guide rail surfaces formed on both sides of the guide column 31 roll in cooperation with the guide rollers on the measuring arm, ensuring the guiding accuracy of the longitudinal movement of the second simulated sample 30. The rolling cooperation reduces frictional resistance during movement.

[0028] Furthermore, the first and second mounting parts of the present invention are raised V-shaped steps, which are the same size as the recessed V-shaped groove inside the measuring arm. This enables the positioning and installation between the measuring arm and the simulated sample, facilitating multiple measurement requirements of the extensometer. The two upper measuring arms 16 and the two lower measuring arms 18, which are set at 180°, are respectively clamped and fixed by the first retaining ring 15 and the second retaining ring 17, ensuring that the same measuring arm group is symmetrically installed in the circumferential direction. This allows the two sensors 21 to synchronously detect the deformation from the symmetrical position of the sample. The arithmetic mean can effectively eliminate the measurement deviation introduced by eccentric loading or uneven local deformation.

[0029] Furthermore, this invention employs two springs 20 to connect the upper measuring arm 16 and the lower measuring arm 18 on both sides respectively, ensuring that the four guide rollers are always in close contact with the guide rail surface. The adjustable screw 5 and the first nut 6 are used to adjust and lock the initial compression of the sensor 21 moving rod. The sensor 21 is installed in the mounting hole 10 at the lower end of the lower measuring arm 18 and secured by the first screw 22, making the installation and removal of the sensor 21 relatively convenient. The adjustable screw 5 can also be relatively flexibly adapted to the stroke requirements of different sensors 21.

[0030] The present invention also provides a method for calibrating a dual-arm high-temperature extensometer, comprising the following steps: The upper measuring arm 16 is installed on the first mounting part, the lower measuring arm 18 is installed on the second mounting part, and the elastic connector is connected between the upper measuring arm 16 and the lower measuring arm 18. Install the detection component on the lower measuring arm 18 and adjust the detection component so that it cooperates with the adjustment component of the upper measuring arm 16; Set the reading of the standard displacement generator to zero and the reading of the detection component to zero; operate the standard displacement generator to drive the second simulated sample 30 to move a given displacement relative to the first simulated sample 26 in the longitudinal direction through the output terminal, record the standard displacement value output by the standard displacement generator, and at the same time record the relative displacement between the upper measuring arm 16 and the lower measuring arm 18 detected by the detection component. Calculate the indication error of the dual-arm high-temperature extensometer based on the standard displacement value and relative displacement.

[0031] The present invention will be further described in detail below through specific embodiments.

[0032] like Figure 2 As shown, the specimen 14 being tested is connected to the upper pull rod 12 and lower pull rod 19 of the high-temperature creep rupture strength testing machine via threads. The specimen 14 has two raised V-shaped steps, and the distance between the two steps is the gauge length of the specimen. The upper and lower measuring arms of the extensometer have recessed V-shaped grooves inside, and their geometric dimensions are the same as those of the raised V-shaped steps on the specimen.

[0033] like Figure 3 and Figure 4As shown, two upper measuring arms 16 are mounted at 180° on the upper boss of the sample and secured by a first retaining ring 15. Two lower measuring arms 18 are mounted at 180° on the lower boss of the sample and secured by a second retaining ring 17. The lower ends of the upper measuring arms 16 and lower measuring arms 18 are respectively equipped with a first guide roller 3 and a second guide roller 9. The two sides of the pull rod 19 are milled into two planes to serve as guide rails. The upper measuring arms 16 and lower measuring arms 18 are respectively tensioned by two springs 20, so that the two upper measuring arms 16 and the two lower measuring arms 18 form a whole, and the two first guide rollers 3 and the second guide rollers 9 can move up and down on the guide rails. Each of the lower ends of the two lower measuring arms 18 has a hole for mounting a sensor 21, which is secured by a first screw 22. Each of the lower ends of the two upper measuring arms 16 is equipped with an adjustable screw 5 and a first nut 6. The compression of the sensor 21 is adjusted by adjusting the length of the screw. After the adjustable screw 5 is adjusted to the desired position, it is secured by the screw. The lower end of the upper pull rod 12, the upper ends of the upper measuring arm 16 and the lower measuring arm 18, the sample 14, and the upper end of the lower pull rod 19 are located inside the furnace chamber of the heating furnace 13. Under the standard temperature and test force, the sample length will increase, and the upper measuring arm 16 and the lower measuring arm 18 will move in opposite directions. Thus, the displacement change between the sample bosses (gauge length) can be detected by the sensor 21.

[0034] like Figure 1 As shown, the measurement standard used for calibrating the dual-arm high-temperature extensometer is the micrometer head 23, which has displacement markings with a resolution of 0.25 μm and a maximum permissible displacement error of ±0.15%. By rotating the micrometer head, the moving shaft 28 of the micrometer head 23 can move up and down. The fixed shaft 24 of the micrometer head 23 is connected to the crossbeam 25 of the machine body and fixed by the second screw 33. The first simulated sample 26 is connected to the crossbeam via threads and secured with the second nut 27. The first simulated sample 26 is a hollow structure. The moving shaft 28 of the micrometer head 23 passes through the through hole of the first simulated sample 26 and is connected to the second simulated sample 30 via threads, secured by the third nut 29. The lower end of the second simulated sample 30 is inserted into the guide hole of the guide column 31. The lower end of the second simulated sample 30 can move freely up and down within the guide hole of the guide column 31 to prevent the extensometer from swaying. Both the first simulated specimen 26 and the second simulated specimen 30 have a raised V-shaped step, and the geometric dimensions of the V-shaped step are the same as the geometric dimensions of the V-shaped groove inside the measuring arm of the extensometer.

[0035] During calibration, the two upper measuring arms 16 of the dual-measuring-arm high-temperature extensometer are mounted on the bosses of the first dummy specimen 26 at 180° to each other, and clamped tightly by the first snap ring 15; the two lower measuring arms 18 are mounted on the bosses of the second dummy specimen 30 at 180° to each other, and clamped tightly by the second snap ring 17. The lower ends of the upper measuring arm 16 and the lower measuring arm 18 are each provided with one guide roller 3, 9. The guide column 31 is fixed on the base 32 of the machine body, and two side surfaces of the guide column 31 are milled into two planes as guide rails. The upper measuring arm 16 and the lower measuring arm 18 are respectively tensioned by two springs 20, so that the two upper measuring arms and the two lower measuring arms form an integral body, and the two first guide rollers 3 and the two second guide rollers 9 can move up and down on the guide rails. The two sensors 21 are respectively mounted at the lower ends of the lower measuring arms 18 on both sides, and fastened by the first screws 22. The moving rod of the sensor 21 abuts against the top of the adjustable screw 5 of the upper measuring arm 16, the compression amount of the sensor 21 is adjusted according to measurement requirements, and then fastened by the first nut 6. Before starting calibration, align the scale line of the micrometer head 23 to the zero position first, and then zero the measuring instrument of the sensor 21. Rotate the micrometer head 23, the moving shaft 28 of the micrometer head 23 moves downward, and the displacement indicated by the micrometer head 23 is l ti , the displacement indication values respectively displayed by the two sensors 21 are l 1i and l 2i , the average value of the indication values of the sensor 21 is calculated according to formula (1), and the relative error of the indication value of the dual-measuring-arm high-temperature extensometer δ i is calculated according to formula (2).

[0036] (1); (2); Calibration of each dual-measuring-arm high-temperature extensometer requires two sets of measurements, and each set of measurements generally has no less than 10 measurement points (excluding the zero point). According to the selected calibration range, the micrometer head 23 applies a specified displacement to the extensometer point by point. When the maximum displacement of the calibration range is reached, return to the zero position. After the first set of measurements is completed, remove the extensometer, then reinstall it on the calibration device, and then continuously perform the second set of measurements in the same method as the first set. Each measurement point in each set is calculated according to formula (1) and formula (2). When the relative error of the indication value at each calibration point δi is better than the maximum allowable error ±Δ of the extensometer, the extensometer is judged to be qualified.

[0037] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Anyone skilled in the art can readily implement the present invention according to the description and above. Any modifications, alterations, or equivalent variations made using the technical content disclosed above are equivalent embodiments of the present invention. Furthermore, any modifications, alterations, or variations made to the above embodiments based on the essential technology of the present invention are still within the protection scope of the present invention.

Claims

1. A tooling for calibration of a dual measuring arm high temperature extensometer comprising an upper measuring arm (16), a lower measuring arm (18), an elastic connection, a detection assembly and an adjustment assembly, characterized in that, The fixture includes a frame, a standard displacement generating device, and a set of simulated test samples; wherein: The standard displacement generating device is mounted on the frame; the simulated sample group includes a first simulated sample (26) and a second simulated sample (30), the first simulated sample (26) is connected to the frame, the output end of the standard displacement generating device passes through the first simulated sample (26) and is connected to the second simulated sample (30), the standard displacement generating device drives the second simulated sample (30) to move longitudinally relative to the first simulated sample (26); the first simulated sample (26) is provided with a first mounting part for mounting the upper measuring arm (16), and the second simulated sample (30) is provided with a second mounting part for mounting the lower measuring arm (18); The upper measuring arm (16) is mounted on the first mounting part, and the lower measuring arm (18) is mounted on the second mounting part. The upper measuring arm (16) and the lower measuring arm (18) are respectively in rolling engagement with the frame. The elastic connecting member is connected between the upper measuring arm (16) and the lower measuring arm (18). The detection component is set on the lower measuring arm (18) and cooperates with the adjustment component to detect the relative displacement between the upper measuring arm (16) and the lower measuring arm (18).

2. The tooling for calibrating a dual measuring arm high temperature extensometer according to claim 1, wherein, The frame includes a crossbeam (25), a guide column (31), and a base (32). The crossbeam (25) is located at the upper end of the guide column (31), and the base (32) is located at the lower end of the guide column (31). The standard displacement generating device is located on the crossbeam (25), and the upper measuring arm (16) and the lower measuring arm (18) are respectively in rolling cooperation with the guide column (31).

3. The tooling for calibrating a dual measuring arm high temperature extensometer according to claim 2, wherein, The standard displacement generating device is a micrometer head (23). The micrometer head (23) includes a fixed shaft (24) and a moving shaft (28). The fixed shaft (24) constitutes the fixed end of the standard displacement generating device and is connected to the crossbeam (25). The moving shaft (28) constitutes the output end. The fixed shaft (24) is connected to the crossbeam (25). The first simulated sample (26) is set as a hollow structure. The moving shaft (28) passes through the through hole of the first simulated sample (26) and is connected to the second simulated sample (30).

4. The tooling for calibrating a dual measuring arm high temperature extensometer according to claim 3, wherein, The calibration fixture also includes a second nut (27) and a third nut (29). The upper end of the first simulated sample (26) is connected to the crossbeam (25) by a thread and is fastened by the second nut (27). The lower end of the moving shaft (28) is connected to the upper end of the second simulated sample (30) by a thread and is fastened by the third nut (29).

5. The tooling for calibrating dual measuring arm high temperature dilatometer according to claim 2, wherein, The lower end of the second simulated sample (30) is inserted into the guide hole of the guide column (31) and can move freely in the longitudinal direction in the guide hole; the two opposite sides of the guide column (31) form guide rail surfaces; the double measuring arm high temperature extensometer also includes a first guide roller (3) and a second guide roller (9); the first guide roller (3) is set on the upper measuring arm (16); the second guide roller (9) is set on the lower measuring arm (18); the first guide roller (3) and the second guide roller (9) respectively roll with two planes.

6. The tooling for calibrating dual measuring arm high temperature dilatometer according to claim 1, wherein, The first mounting part and the second mounting part are respectively raised V-shaped steps. The upper measuring arm (16) and the lower measuring arm (18) are respectively provided with recessed V-shaped grooves. The geometric dimensions of the raised V-shaped steps are the same as the geometric dimensions of the recessed V-shaped grooves.

7. The tooling for calibrating dual measuring arm high temperature dilatometer according to claim 1, wherein, The calibration fixture also includes a first retaining ring (15) and a second retaining ring (17). The two upper measuring arms (16) are installed at 180° on the first mounting part and are secured by the first retaining ring (15). The two lower measuring arms (18) are installed at 180° on the second mounting part and are secured by the second retaining ring (17).

8. The fixture for calibrating a dual-arm high-temperature extensometer according to claim 1, characterized in that, The elastic connector is a spring (20), and the number of springs (20) is set to two; the two springs (20) are respectively connected between the two upper measuring arms (16) and the two lower measuring arms (18) so as to pull the two upper measuring arms (16) and the two lower measuring arms (18) together to form a whole.

9. The fixture for calibrating a dual-arm high-temperature extensometer according to claim 1, characterized in that, The adjustment assembly includes an adjustable screw (5) and a first nut (6). The adjustable screw (5) is located at the lower end of the upper measuring arm (16), and the first nut (6) cooperates with the adjustable screw (5) to lock the adjustable screw (5). The detection assembly is a sensor (21). The sensor (21) is installed in the mounting hole (10) at the lower end of the lower measuring arm (18), and the moving rod of the sensor (21) abuts against the top of the adjustable screw (5). The calibration fixture also includes a first screw (22), and the sensor (21) is fastened to the mounting hole (10) by the first screw (22).

10. A method for calibrating a dual-arm high-temperature extensometer, characterized in that, The calibration is performed using the tooling described in any one of claims 1-9 for a dual-arm high-temperature extensometer, and includes the following steps: The upper measuring arm (16) is installed on the first mounting part, the lower measuring arm (18) is installed on the second mounting part, and the elastic connector is connected between the upper measuring arm (16) and the lower measuring arm (18); Install the detection component on the lower measuring arm (18) and adjust the detection component so that it matches the adjustment component of the upper measuring arm (16); Set the reading of the standard displacement generator to zero and the reading of the detection component to zero; operate the standard displacement generator to drive the second simulated sample (30) to move a given displacement relative to the first simulated sample (26) in the longitudinal direction through the output end, record the standard displacement value output by the standard displacement generator, and at the same time record the relative displacement between the upper measuring arm (16) and the lower measuring arm (18) detected by the detection component. Calculate the indication error of the dual-arm high-temperature extensometer based on the standard displacement value and relative displacement.

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