A device and method for improving the strain measurement accuracy of high-temperature strain calibration devices.

Abstract

This invention proposes a device and method for improving the strain measurement accuracy of a high-temperature strain calibration device. The device includes: a mounting frame, a mechanical strain measurement assembly, and a loading assembly. Part of the mounting frame is placed inside a high-temperature furnace. A calibration beam is connected to the mounting frame and located inside the furnace. The mechanical strain measurement assembly includes a contact rod assembly, a measuring seat assembly, and a grating ruler assembly. The measuring seat assembly includes a measuring seat body and is connected to the mounting frame. The contact rod assembly includes a contact rod and a wing plate. The contact rod passes sequentially through the measuring seat body, the wing plate, and the mounting frame and abuts against the calibration beam. The wing plate is fixedly connected to the measuring seat body. The grating ruler assembly includes a grating ruler frame and a grating ruler. The grating ruler frame is connected to the mounting frame, and the grating ruler is connected to the wing plate. The loading assembly applies a loading force to the calibration beam, causing the calibration beam to deform towards the contact rod. This invention improves the strain measurement accuracy of a high-temperature strain calibration device.

Description

Technical Field

[0001] This invention relates to the field of high-temperature strain gauge measurement technology, and more specifically, to a device and method for improving the strain measurement accuracy of high-temperature strain calibration devices. Background Technology

[0002] A strain gauge is a sensor used to measure the deformation of materials and mechanisms caused by changes in stress, converting deformation into changes in resistance. Its sensitivity coefficient represents the rate of change of resistance when a unit strain occurs, characterizing the relationship between the measured physical quantity and the electrical signal. It is one of the most important parameters of a strain gauge, especially in high-temperature strain measurements, where the sensitivity coefficient changes with temperature. Therefore, precise calibration of the strain gauge's sensitivity coefficient at different temperatures is necessary to achieve accurate measurement of high-temperature strain signals.

[0003] In related technologies, the calibration method for a four-point bending constant strain beam involves placing the calibration beam in a simply supported form inside a blast furnace. During calibration, a symmetrical and equal load is applied to the beam, with the left and right ends serving as support points. The area between the two loading points is a constant strain region. Based on the deflection curve equation of mechanics of materials, the relationship between the strain of the constant strain section of the calibration beam and the deflection and dimensional parameters of the calibration beam can be obtained. Therefore, by measuring the change in deflection of the calibration beam, the mechanical strain value of the constant strain section of the calibration beam can be obtained. There are three main methods for measuring the deflection of calibration beams: The first method measures the deflection change at the midpoint of the calibration beam using a touch rod. This method includes the deformation of the calibration beam support mechanism and the thermal deformation of the touch rod as part of the calibration beam deformation, leading to inaccurate measurement results. The second method measures the midpoint deflection of the calibration beam using non-contact methods such as laser ranging. This method does not use a touch rod, but it still cannot solve the error caused by the deformation of the calibration beam support mechanism. The third method uses a three-point deflection support. The support is installed on the calibration beam, and a displacement sensor is placed at the midpoint of the support. The measurement result is the deflection difference between the support fulcrum and the midpoint. The mechanical strain on the calibration beam is calculated based on the difference. This structure can eliminate the influence of the overall deformation of the support mechanism. However, when conducting experiments at high temperatures, it still cannot eliminate the problem of thermal deformation of the touch rod. Furthermore, the three-point deflection support is placed in a high-temperature environment, and the deformation of the calibration beam affects the installation and positioning of the three-point deflection support, making this method less suitable for high-temperature conditions. Summary of the Invention

[0004] The present invention aims to at least partially solve one of the technical problems in the related art.

[0005] Therefore, embodiments of the present invention propose a device for improving the strain measurement accuracy of a high-temperature strain calibration device. This device improves the strain measurement accuracy of the high-temperature strain calibration device and provides a reliable technical means for the accurate measurement of high-temperature strain signals.

[0006] An apparatus for improving the strain measurement accuracy of a high-temperature strain calibration device according to an embodiment of the present invention includes:

[0007] The mounting frame is partially placed inside a high-temperature furnace. The calibration beam is connected to the mounting frame and located inside the high-temperature furnace. The calibration beam is spaced apart from the mounting frame in the height direction of the mounting frame. A mechanical strain measurement assembly includes a contact rod assembly, a measuring base assembly, and a grating ruler assembly. The measuring base assembly includes a measuring base body connected to a mounting frame. The contact rod assembly includes a contact rod and a wing plate. The first end of the contact rod passes through the measuring base body, the wing plate, and the mounting frame sequentially and abuts against a calibration beam. The wing plate is fixedly connected to the measuring base body. The grating ruler assembly includes a grating ruler frame and a grating ruler. The grating ruler frame is connected to the mounting frame. The first end of the grating ruler is connected to the wing plate. There are multiple contact rod assemblies and multiple grating ruler assemblies. The multiple contact rod assemblies are arranged at intervals along the length direction of the mounting frame, and each of the multiple contact rod assemblies corresponds to one of the multiple grating ruler assemblies. A loading component, comprising a loading part, the first end of which passes through the mounting frame and is connected to the calibration beam, the loading component being used to apply a loading force to the calibration beam to cause the calibration beam to deform toward the contact rod.

[0008] The device for improving the strain measurement accuracy of a high-temperature strain calibration apparatus according to this invention reduces the influence of thermal deformation of the contact rod on the measurement results by placing part of the mechanical strain measurement components on the outside of the high-temperature furnace, thereby improving measurement accuracy. By measuring deflection with a grating ruler on the outside of the high-temperature furnace, a non-contact measurement method is adopted, improving measurement resolution and accuracy. It is also suitable for high-temperature environments, enabling the entire device to achieve accurate strain measurement at high temperatures.

[0009] In some embodiments, the contact rod assembly further includes an elastic element located between the wing plate and the measuring base body in the height direction of the mounting frame, with a first end of the elastic element abutting against the wing plate and a second end of the elastic element abutting against the measuring base body.

[0010] In some embodiments, the measuring seat assembly further includes a guide post, a first end of which is connected to the measuring seat body, and a second end of which extends through the wing plate.

[0011] In some embodiments, there are multiple guide posts, which are arranged opposite to each other on both sides of the contact rod in the width direction of the mounting frame.

[0012] In some embodiments, the mechanical strain measurement assembly further includes a first linear bearing and a second linear bearing. The first linear bearing is mounted on the contact rod and is connected to the measuring base body. The second linear bearing is mounted on the guide post and is connected to the wing plate.

[0013] In some embodiments, the first linear bearing and the second linear bearing are arranged at intervals in the height direction of the mounting frame.

[0014] In some embodiments, the grating ruler assembly further includes a nylon sleeve fitted onto the grating ruler, the grating ruler frame having mounting holes, and at least a portion of the nylon sleeve fitting into the mounting holes.

[0015] The method for improving the strain measurement accuracy of a high-temperature strain calibration device according to embodiments of the present invention is implemented using the device for improving the strain measurement accuracy of a high-temperature strain calibration device as described in any of the above embodiments, and includes the following steps: Adjust the installation position of the mechanical strain measurement assembly, arrange three contact rods at intervals along the length of the calibration beam, and make the upper end of the contact rods abut against the lower surface of the calibration beam; Adjust the mounting position of the grating ruler and the adjusting rod so that the top of the grating ruler abuts against the wing plate; A loading force is applied to the calibration beam, causing the calibration beam to bend towards the contact rod side; The contact points between the ends of the three contact rods and the calibration beam are marked as A, B, and C, respectively. The deflection values ​​of the top contact points of the three contact rods are then obtained. , , ,in, The deflection value of the middle contact rod among the three contact rods is obtained by taking the average deflection value of measuring points A and C and subtracting it from the deflection value of measuring point B. ,Right now ; Strain was calculated based on three measuring points. ,Right now ,in, To calibrate the beam thickness, p is the deflection difference, and d is the distance between two adjacent measuring points.

[0016] In some embodiments, the distance between two adjacent contact rods is equal along the length direction of the calibration beam.

[0017] In some embodiments, adjusting the mounting position of the grating ruler and the adjusting rod further includes the step of adjusting the compression of the grating ruler to between one-third and two-thirds of its total range. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural schematic diagram of a device for improving the strain measurement accuracy of a high-temperature strain calibration device according to an embodiment of the present invention.

[0019] Figure 2 This is a cross-sectional structural schematic diagram of a device for improving the strain measurement accuracy of a high-temperature strain calibration device according to an embodiment of the present invention.

[0020] Figure 3 yes Figure 2 An enlarged schematic diagram of A shown in the figure.

[0021] Figure 4 This is a partial three-dimensional schematic diagram of the device for improving the strain measurement accuracy of a high-temperature strain calibration device according to an embodiment of the present invention.

[0022] Figure 5 This is a schematic diagram of the usage state of the device for improving the strain measurement accuracy of the high-temperature strain calibration device according to an embodiment of the present invention.

[0023] Figure 6 This is a schematic diagram of the parameters of the calibration beam in the method for improving the strain measurement accuracy of the high-temperature strain calibration device according to an embodiment of the present invention.

[0024] Figure 7 This is a schematic diagram of the parameters of the calibration beam in the method for improving the strain measurement accuracy of the high-temperature strain calibration device according to an embodiment of the present invention.

[0025] Figure 8 This is a schematic diagram of the parameters of the calibration beam in the method for improving the strain measurement accuracy of the high-temperature strain calibration device according to an embodiment of the present invention.

[0026] Figure label: 100. Calibration beam; 200. High-temperature furnace. 1. Install the frame; 11. Install the base; 12. Install the support legs; 13. Install the base. 2. Mechanical strain measurement components 21. Contact rod assembly; 211. Contact rod; 212. Wing plate; 213. Elastic element; 214. Limiting ring. 22. Measuring base assembly; 221. Measuring base body; 222. Guide post. 23. Grating ruler assembly; 231. Grating ruler holder; 232. Grating ruler; 233. Nylon sleeve; 234. Adjusting rod. 31. First linear bearing; 32. Second linear bearing; 4. Load components, 41. Load part. Detailed Implementation

[0027] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0028] The following describes, with reference to the accompanying drawings, an apparatus for improving the strain measurement accuracy of a high-temperature strain calibration device according to an embodiment of the present invention.

[0029] like Figures 1-5 As shown, the device for improving the strain measurement accuracy of the high-temperature strain calibration device according to an embodiment of the present invention includes: a mounting frame 1, a mechanical strain measurement component 2, and a loading component 4.

[0030] Part of the mounting frame 1 is placed inside the high-temperature furnace 200. The calibration beam 100 is connected to the mounting frame 1 and located inside the high-temperature furnace 200, in the height direction of the mounting frame 1 (e.g., Figure 1 (in the vertical direction), the calibration beam 100 is spaced apart from the mounting frame 1. Specifically, such as... Figures 1-5 As shown, the mounting frame 1 includes a mounting base 11, support legs 12, and a mounting base 13. The mounting base 13 is fixedly installed inside the high-temperature furnace 200. The upper end of the support leg 12 is connected to the mounting base 13, and the lower end of the support leg 12 is connected to the mounting base 11 and located outside the high-temperature furnace 200. Preferably, the upper surface of the mounting base 13 has multiple protrusions, which are located at the left and right ends of the mounting base 13, respectively, to support the calibration beam 100 and to create a certain gap between the calibration beam 100 and the mounting base 13, facilitating the subsequent loading action of the loading assembly 4.

[0031] It is understandable that the calibration beam 100 is placed above the mounting base 13 and spaced apart from the mounting base 13, so that the deformation of the calibration beam 100 can be independent of the deformation of the mounting frame 1, thereby reducing the impact of the overall deformation of the support mechanism on the measurement results.

[0032] The mechanical strain measurement assembly 2 includes a contact rod assembly 21, a measuring base assembly 22, and a grating ruler assembly 23. The measuring base assembly 22 includes a measuring base body 221, which is connected to the mounting frame 1. The contact rod assembly 21 includes a contact rod 211 and a wing plate 212. The first end of the contact rod 211 passes sequentially through the measuring base body 221, the wing plate 212, and the mounting frame 1, and abuts against the calibration beam 100. The wing plate 212 is fixedly connected to the measuring base body 221. The grating ruler assembly 23 includes a grating ruler frame 231 and a grating ruler 232. The grating ruler frame 231 is connected to the mounting frame 1, and the first end of the grating ruler 232 is connected to the wing plate 212. There are multiple contact rod assemblies 21 and grating ruler assemblies 23, with multiple contact rod assemblies 21 extending along the length of the mounting frame 1 (e.g., ...). Figure 1The components are arranged at intervals in the left and right directions, and multiple touch rod assemblies 21 correspond one-to-one with multiple grating ruler assemblies 23.

[0033] Specifically, such as Figures 1-5 As shown, the measuring base body 221 can be fixedly connected to the mounting frame 1 by screws, bolts, etc. The wing plate 212 is located above the measuring base body 221. The lower end of the contact rod 211 is connected to the measuring base body 221 and is movable relative to the measuring base body 221. The upper end of the contact rod 211 passes through the wing plate 212 and the mounting base 13, abutting against the lower surface of the calibration beam 100. The wing plate 212 is fixedly connected to the contact rod 211 and can move with the movement of the contact rod 211. The grating ruler frame 231 is fixedly connected to the mounting frame 1 by screws, bolts, etc. The grating ruler frame 231 provides an installation position for the grating ruler 232. The upper end of the grating ruler 232 is connected to the wing plate 212, so that the movement of the contact rod 211 drives the movement of the wing plate 212, thereby causing the wing plate 212 to act on the grating ruler 232, thus realizing the monitoring of deflection.

[0034] Understandably, the combined design of the contact rod assembly 21 and the grating ruler assembly 23 can effectively measure the deflection change of the calibration beam 100 without being affected by the thermal deformation of the contact rod 211 or the deformation of the support mechanism. The contact rod assembly 21 directly measures the deformation of the calibration beam 100 through contact with the contact rod 211, avoiding the influence of thermal deformation of the contact rod 211 on the measurement results. The grating ruler assembly 23 measures the displacement of the contact rod 211 through the grating ruler 232, achieving high-precision deflection measurement.

[0035] The loading component 4 includes a loading part 41, the first end of which passes through the mounting frame 1 and is connected to the calibration beam 100. The loading component 4 is used to apply a loading force to the calibration beam 100 so that the calibration beam 100 deforms toward the contact rod 211.

[0036] It is understandable that, such as Figures 1-5 As shown, the upper end of the loading part 41 passes through the mounting base 13 and is fixedly connected to the calibration beam 100, so that the loading assembly 4 can be activated to control the loading part 41 to move downward, thereby applying a downward pulling force to the calibration beam 100, causing the calibration beam 100 to bend downward, thereby pushing the contact rod 211 to move downward. The movement of the contact rod 211 is then monitored by the grating ruler 232, thus realizing the deflection measurement.

[0037] Preferably, such as Figures 1-5 As shown, the multiple contact rods 211 are located in the middle of the calibration beam 100, and the loading part 41 is located on the left and right sides of the contact rods 211 to prevent interference during the application of loading force and thus avoid affecting the measurement results.

[0038] In other words, the device for improving the strain measurement accuracy of the high-temperature strain calibration device in this embodiment of the invention achieves accurate transmission of the deflection of the calibration beam 100 to the grating ruler 232 by placing part of the mechanical strain measurement component 2 on the outside of the high-temperature furnace 200, thus solving the problem that the grating ruler 232 cannot withstand high temperatures. Figure 1 As shown, three sets of contact rod assemblies 21 and grating ruler assemblies 23 are evenly spaced in the left and right directions. By measuring the deflection values ​​at the ends of multiple contact rods, the deflection difference of the calibration beam 100 can be obtained, and then the mechanical strain of the calibration beam 100 can be calculated. This not only offsets the vertical displacement of the calibration beam 100 caused by the mechanical load and thermal expansion of the mounting frame 1, but also offsets the deflection measurement deviation caused by the thermal expansion of the contact rod 211, enabling the entire device to achieve accurate strain measurement at high temperatures.

[0039] In some embodiments, the contact rod assembly 21 further includes an elastic element 213, which is located between the wing plate 212 and the measuring seat body 221 in the height direction of the mounting frame 1, with a first end of the elastic element 213 abutting against the wing plate 212 and a second end of the elastic element 213 abutting against the measuring seat body 221.

[0040] Specifically, such as Figures 1-5 As shown, the upper end of the elastic element 213 abuts against the wing plate 212, and the lower end of the elastic element 213 abuts against the measuring body. That is, when the contact rod 211 moves downward and drives the wing plate 212 to move, the elastic element 213 is compressed and deformed under the squeezing action of the wing plate 212. The compression of the elastic element 213 can exert upward pressure on the wing plate 212, so that the contact rod 211 always maintains contact with the lower surface of the calibration beam 100, thereby improving the measurement accuracy.

[0041] Understandably, during the debugging phase, the fixed position between the contact rod 211 and the wing plate 212 can be adjusted so that the upper end of the contact rod 211 contacts the calibration beam 100 and the elastic element 213 is in a compressed state. In other words, during the debugging phase, when the upper end of the contact rod 211 contacts the calibration beam 100, the elastic element 213 is in a compressed state. This means that under the elastic force of the elastic element 213, the force acting on the wing plate 212 counteracts the weight of the contact rod 211 and the wing plate 212, allowing the contact rod 211 to maintain contact with the calibration beam 100 under the elastic force of the elastic element 213. This enables it to accurately follow the deformation of the calibration beam 100 in real time, ensuring the accuracy of deflection measurement.

[0042] It should be noted that the elastic element 213 can be a spring, a rubber pad, or other element with appropriate elastic properties. Preferably, the elastic element 213 can be a helical spring to facilitate its mounting on the contact rod 211.

[0043] Optionally, the contact rod assembly 21 also includes a limiting ring 214, which is fitted on the contact rod 211 and located below the elastic member 213 to limit the movement of the elastic member 213 and prevent the elastic member 213 from being severely deformed due to excessive pressure.

[0044] In some embodiments, the measuring seat assembly 22 further includes a guide post 222, the first end of which is connected to the measuring seat body 221, and the second end of which is arranged through the wing plate 212.

[0045] Specifically, such as Figures 1-5 As shown, the lower end of the guide post 222 can be connected to the measuring body by means of threaded connection, plug-in connection, etc., and the upper end of the guide post 222 passes through the wing plate 212 so that the wing plate 212 can move relative to the guide post 222.

[0046] Understandably, the addition of the guide post 222 increases the structural stability of the measuring seat assembly 22, preventing unnecessary displacement of the measuring seat body 221 under high temperature or external force. The guide post 222 helps maintain the alignment between the contact rod 211 and the calibration beam 100, ensuring that the contact rod 211 can accurately measure the deflection change of the calibration beam 100. The guide post 222 also restricts the lateral and longitudinal movement of the measuring seat body 221, reducing measurement errors caused by these movements.

[0047] Thus, the guide post 222 provides a stable path, allowing the contact rod 211 to maintain linear motion during measurement, avoiding possible offset or deviation, thereby improving measurement accuracy.

[0048] Preferably, there are multiple guide posts 222, and the multiple guide posts 222 are arranged in the width direction of the mounting frame 1 (e.g., ...). Figure 1 They are arranged opposite each other on both sides of the contact rod 211 in the front-back direction.

[0049] Specifically, such as Figures 1-5 As shown, taking two guide posts 222 as an example, the two guide posts 222 are respectively arranged on the front and rear sides of the contact rod 211. Preferably, the positions of the guide posts 222 relative to the contact rod 211 can be mirror symmetrical to ensure the balance and stability of the structure.

[0050] Understandably, the even distribution of multiple guide posts 222 improves the overall balance of the measuring seat assembly 22 and reduces structural tilting or deformation caused by unilateral pressure or temperature changes. The guide posts 222 on both sides work together to provide more precise guidance, ensuring that the vertical movement of the contact rod 211 is not affected by lateral offset, thus maintaining measurement accuracy. The design of multiple guide posts 222 helps to improve the torsional resistance of the entire measuring seat assembly 22, which is crucial for preventing torsional deformation caused by external forces (such as wind loads, vibrations, etc.).

[0051] In some embodiments, the mechanical strain measurement assembly 2 further includes a first linear bearing 31 and a second linear bearing 32. The first linear bearing 31 is mounted on the contact rod 211 and is connected to the measuring seat body 221. The second linear bearing 32 is mounted on the guide post 222 and is connected to the wing plate 212.

[0052] Specifically, such as Figures 1-5 As shown, a first linear bearing 31 is mounted on the contact rod 211, and the outer peripheral wall of the first linear bearing 31 is connected to the measuring seat body 221. This allows the contact rod 211 to slide freely inside the first linear bearing 31 while maintaining linear motion (movement in the up-down direction). Similarly, a second linear bearing 32 is mounted on the guide post 222, and the outer peripheral wall of the second linear bearing 32 is connected to the wing plate 212, allowing the wing plate 212 to maintain synchronous movement with the contact rod 211 relative to the guide post 222.

[0053] Understandably, the use of linear bearings significantly reduces friction between the contact rod 211 and the measuring seat body 221, and between the wing plate 212 and the guide post 222, making the movement of the contact rod 211 smoother and reducing measurement errors caused by friction. Linear bearings ensure the linear movement of the contact rod 211 and the wing plate 212, preventing lateral offset or twisting and improving measurement accuracy. The addition of linear bearings improves the motion stability of the contact rod 211 and the wing plate 212 in high-temperature environments, maintaining good motion characteristics even under vibration or impact loads.

[0054] Preferably, the grating ruler assembly 23 further includes an adjusting rod 234, which is connected to the wing plate 212 by a threaded connection, and the lower end of the adjusting rod 234 contacts the contact of the grating ruler 232.

[0055] In other words, since the end of the wing plate 212 contacts the contact of the grating ruler 232 through the adjusting rod 234, the grating ruler 232 contacts are compressed when the calibration beam 100 deforms. Therefore, the grating ruler 232 contacts will apply a bending moment to the wing plate 212. In order to counteract the influence of this bending moment on the positioning of the wing plate 212, two sets of linear bearings are designed at symmetrical positions on both sides of the contact rod 211 of the wing plate 212 so that the wing plate 212 can maintain a horizontal positioning.

[0056] In some embodiments, the first linear bearing 31 and the second linear bearing 32 are arranged at intervals in the height direction of the mounting frame 1.

[0057] It is understandable that, such as Figures 1-5 As shown, the second linear bearing 32 is arranged horizontally in the front-to-back direction, and the first linear bearing 31 is located below the second linear bearing 32 in the height direction. Thus, the three linear bearings present a triangular positional relationship, which can reliably and accurately constrain the contact rod 211, keep the contact rod 211 in a vertical direction of movement, and avoid deformation transmission errors caused by the deflection of the contact rod 211.

[0058] In some embodiments, the grating ruler assembly 23 further includes a nylon sleeve 233, which is fitted onto the grating ruler 232. The grating ruler frame 231 has mounting holes, and at least a portion of the nylon sleeve 233 fits into the mounting holes.

[0059] Specifically, such as Figures 1-5 As shown, the nylon sleeve 233 is fitted onto the grating ruler 232, serving to protect and secure the grating ruler 232. Specifically, the grating ruler frame 231 has mounting holes, and at least a portion of the nylon sleeve 233 fits into these holes, allowing the grating ruler 232 to be fixed to the grating ruler frame 231. The nylon sleeve 233 then protects the grating ruler 232 from direct contact.

[0060] Understandably, the nylon sleeve 233 has a C-shaped cross-sectional profile, meaning it has a through groove. When the nylon sleeve 233 is tightened into the mounting hole, this groove is compressed, thus securing the grating ruler 232. Furthermore, by adjusting the clamping force to ensure that the frictional force is slightly greater than the contact spring force of the grating ruler 232, the clamping force can keep the grating ruler 232 stationary during normal operation. In case of excessive pressure, the grating ruler 232 will be pushed, facilitating coaxiality adjustment and protecting the sensor.

[0061] The following describes a method for improving the strain measurement accuracy of a high-temperature strain calibration device according to an embodiment of the present invention.

[0062] like Figures 1-8As shown, the method for improving the strain measurement accuracy of a high-temperature strain calibration device according to an embodiment of the present invention is implemented using any of the apparatuses for improving the strain measurement accuracy of a high-temperature strain calibration device described in the above embodiments, and is characterized by comprising the following steps: Adjust the installation position of the mechanical strain measurement assembly, arranging three contact rods spaced apart along the length of the calibration beam, with the upper ends of the contact rods abutting against the lower surface of the calibration beam. It is understood that, as... Figures 1-5 As shown, three contact rods are arranged at intervals in the left-right direction, ensuring that the position of the contact rods covers the iso-strain region of the calibration beam. The upper end of the contact rod is positioned to abut against the lower surface of the calibration beam. When the calibration beam bends, the contact rod can directly sense the change in deflection of the calibration beam.

[0063] Adjust the mounting positions of the grating ruler and the adjusting rod so that the top of the grating ruler abuts against the adjusting rod. This means the top of the grating ruler should be aligned with the adjusting rod. The wing plate moves with the movement of the contact rod, and the grating ruler measures the deflection change of the calibration beam by sensing the displacement of the wing plate.

[0064] Ensure that the grating ruler and the wing plate are in close and stable contact to accurately record and transmit displacement signals.

[0065] A loading force is applied to the calibration beam, causing it to bend towards the contact rod. This is understood as applying a loading component to the calibration beam to induce bending towards the contact rod. The magnitude of the loading force should be determined based on the material properties of the calibration beam and the expected strain range. The loading force should be applied uniformly and symmetrically to ensure that the calibration beam deforms evenly under stress, forming an isostrain region.

[0066] The contact points between the ends of the three contact rods and the calibration beam are marked as A, B, and C, respectively. The deflection values ​​of the top contact points of the three contact rods are then obtained. , , ,in, The deflection value of the middle contact rod among the three contact rods is obtained by taking the average deflection value of measuring points A and C and subtracting it from the deflection value of measuring point B. ,Right now .

[0067] Strain was calculated based on three measuring points. ,Right now ,in, To calibrate the beam thickness, p is the deflection difference, and d is the distance between two adjacent measuring points.

[0068] It should be noted that the above strain calculation also includes the following steps: like Figures 6-8As shown, based on the fundamental theory of beam bending deformation, the length of the neutral layer is... The length of the lower surface of the beam after stretching is ,but: , formula 1; , formula 2; According to the definition of strain, we know that: ; Substituting Formula 1 and Formula 2 into the above equation, we obtain the formula for calculating the strain at three points: , formula 3 Furthermore, it should be noted that in practice, the mechanical strain to be applied is often used as the target value. During loading, the difference in deflection calculated from the mechanical strain is used as the loading target. The calculation method is as follows: From strain calculation formula 3, we can obtain:

[0069] List the coefficients of the quadratic equation:

[0070] Applying the quadratic formula:

[0071] Based on the actual situation during strain loading, when calibrating the beam bending, It should be a finite positive value, and approach 0. The value also approaches zero. Therefore, the negative solution satisfies this condition, that is: .

[0072] In some embodiments, the distance between any two adjacent contact rods is equal along the length of the calibration beam. It is understood that equal distances between adjacent contact rods ensure a uniform distribution of the contact rods along the length. This uniform distribution allows for the detection of off-center loading due to misalignment in the loading mechanism or calibration beam assembly. A large deviation in the deflection values ​​measured on both sides indicates off-center loading. In this case, the two loading positions of the calibration beam will no longer be in a state of constant strain, and the loading mechanism and calibration beam should be inspected and reinstalled.

[0073] The core of this calculation scheme is to calculate the mechanical strain of the constant-strain section of the calibration beam by measuring the difference in deflection between the midpoint and both sides of the beam. Using the deflection difference to calculate the mechanical strain of the calibration beam has two advantages: First, when the calibration beam is loaded, the deformation of the mounting frame under load causes an overall upward or downward displacement of the calibration beam, which is included in the measured deflection value. The deflection difference can offset this overall displacement, resulting in a more accurate calculated mechanical strain. Second, since the mounting base, contact rod, and support legs are located in a high-temperature furnace, changes in temperature cause lateral thermal expansion of the mounting base, leading to changes in the distance between the support points of the calibration beam. Thermal expansion of the support legs causes an overall upward or downward displacement of the calibration beam. Thermal expansion of the contact rod directly affects the deflection measurement results. Based on Formula 3, the mechanical strain of the calibration beam is calculated without considering the distance between the support points. The thermal deformation of the contact rod and support legs can be offset by the deflection difference, making the calculated mechanical strain more accurate.

[0074] In some embodiments, adjusting the mounting position of the grating ruler and the adjusting rod further includes the step of adjusting the compression of the grating ruler to between one-third and two-thirds of its total range. It is understood that when installing the grating ruler, its initial compression needs to be adjusted according to the total range of the grating ruler (i.e., the maximum displacement range that the grating ruler can measure). The goal is to set the compression of the grating ruler between one-third and two-thirds of its total range.

[0075] In other words, the linear scale typically exhibits optimal linearity in the middle range of its total range. By adjusting the compression within this range, high linearity of the linear scale during measurement can be ensured, thereby improving the accuracy of strain measurement. If the compression is too small, the linear scale may not fully utilize its range, thus limiting the dynamic range of the measurement. If the compression is too large, it may overload the linear scale, affecting its long-term performance and measurement accuracy. Adjusting the compression to the middle range of the total range avoids both of these situations.

[0076] It should be noted that the pre-loading experiment on the calibration beam was conducted with a maximum strain that was 10% higher than that in the formal experiment. After the target strain was applied, the beam was unloaded within 15 seconds. The test was then conducted to check whether the contact rod could move with the deformation of the calibration beam, especially whether the movement of the contact rod was smooth during unloading and whether there was any jamming.

[0077] After confirming that everything is correct, start the equipment. The equipment applies deformation to the calibration beam to induce mechanical strain in the calibration beam. The strain value is calculated by the deflection difference between the average values ​​of the central grating ruler and the two side grating rulers.

[0078] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0079] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0080] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0081] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0082] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0083] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A device for improving the strain measurement accuracy of a high-temperature strain calibration device, characterized in that, include: The mounting frame is partially placed inside a high-temperature furnace. The calibration beam is connected to the mounting frame and located inside the high-temperature furnace. In the height direction of the mounting frame, the calibration beam is spaced apart from the mounting frame. The mounting frame includes a mounting base, support legs, and a mounting base. A mechanical strain measurement assembly includes a contact rod assembly, a measuring base assembly, and a grating scale assembly. The measuring base assembly includes a measuring base body connected to a mounting frame. The contact rod assembly includes a contact rod and a wing plate. The first end of the contact rod passes sequentially through the measuring base body, the wing plate, and the mounting frame, and abuts against a calibration beam. The wing plate is located above the measuring base body. The lower end of the contact rod is connected to the measuring base body and is movable relative to the measuring base body. The upper end of the wing plate and the mounting base abut against the lower surface of the calibration beam. The wing plate is fixedly connected to the contact rod and can move with the contact rod. The grating ruler assembly includes a grating ruler frame and a grating ruler. The grating ruler frame is connected to the mounting frame. The first end of the grating ruler is connected to the wing plate. There are multiple contact rod assemblies and multiple grating ruler assemblies. The multiple contact rod assemblies are arranged at intervals along the length direction of the mounting frame, and each of the multiple contact rod assemblies corresponds to one of the multiple grating ruler assemblies. The grating ruler assembly also includes an adjustment rod, which is connected to the wing plate by a threaded connection, and the lower end of the adjustment rod contacts the contact of the grating ruler; A loading assembly includes a loading part, the first end of which passes through the mounting frame and is connected to the calibration beam. The loading assembly is used to apply a loading force to the calibration beam to cause the calibration beam to deform toward the contact rod. The contact rod assembly also includes an elastic element. In the height direction of the mounting frame, the elastic element is located between the wing plate and the measuring base body, and the first end of the elastic element abuts against the wing plate, and the second end of the elastic element abuts against the measuring base body. The measuring base assembly also includes a guide post, the first end of which is connected to the measuring base body, and the second end of which passes through the wing plate. There are multiple guide posts, and the multiple guide posts are arranged opposite to each other on both sides of the contact rod in the width direction of the mounting frame; The mechanical strain measurement assembly further includes a first linear bearing and a second linear bearing. The first linear bearing is mounted on the contact rod and is connected to the measuring base body. The second linear bearing is mounted on the guide post and is connected to the wing plate.

2. The device for improving the strain measurement accuracy of a high-temperature strain calibration device according to claim 1, characterized in that, The first linear bearing and the second linear bearing are arranged at intervals along the height direction of the mounting frame.

3. The device for improving the strain measurement accuracy of a high-temperature strain calibration device according to claim 2, characterized in that, The grating ruler assembly also includes a nylon sleeve, which is fitted onto the grating ruler. The grating ruler frame has mounting holes, and at least a portion of the nylon sleeve fits into the mounting holes.

4. A method for improving the strain measurement accuracy of a high-temperature strain calibration device, wherein the method is performed using the apparatus for improving the strain measurement accuracy of a high-temperature strain calibration device as described in any one of claims 1-3, characterized in that, Includes the following steps: Adjust the installation position of the mechanical strain measurement assembly, arrange three contact rods at intervals along the length of the calibration beam, and make the upper end of the contact rods abut against the lower surface of the calibration beam; Adjust the mounting position of the grating ruler and the adjusting rod so that the top of the grating ruler abuts against the wing plate; A loading force is applied to the calibration beam, causing the calibration beam to bend towards the contact rod side; The contact points between the ends of the three contact rods and the calibration beam are marked as A, B, and C, respectively. The deflection values ​​of the top contact points of the three contact rods are then obtained. , , ,in, The deflection value of the middle contact rod among the three contact rods is obtained by taking the average deflection value of measuring points A and C and subtracting it from the deflection value of measuring point B. ,Right now ; Strain was calculated based on three measuring points. ,Right now ,in, To calibrate the beam thickness, p is the deflection difference, and d is the distance between two adjacent measuring points.

5. The method for improving the strain measurement accuracy of a high-temperature strain calibration device according to claim 4, characterized in that, Along the length of the calibration beam, the distance between any two adjacent contact rods is equal.

6. The method for improving the strain measurement accuracy of a high-temperature strain calibration device according to claim 4, characterized in that, Adjusting the installation position of the grating ruler and the adjusting rod also includes the following steps: adjusting the compression of the grating ruler to between one-third and two-thirds of its total range.

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