Signal amplification device and method for continuously measuring bending stress of rotating shaft section

Abstract

The invention discloses a signal amplification device and method for continuously measuring bending stress of a rotating shaft section. The device comprises a split type chuck assembly, a test rod and a signal acquisition module. The split type chuck assembly surrounds and is fixed on the periphery of a rotating shaft to be detected, and is provided with a mounting fulcrum along the axial direction; two ends of the test rod are fixed between the mounting fulcrums, form height difference with the surface of the rotating shaft and synchronously rotate; the signal acquisition module comprises a strain gauge arranged on the surface of the test rod, a wireless strain collector and a power supply unit. The test rod is erected on the rotating shaft, and tiny bending deformation of the rotating shaft is converted into large stretching or compression deformation on the test rod by utilizing the height difference between the rod surface and the shaft surface and a mechanical connection structure, so that a strain signal is effectively amplified, and the problems of insufficient sensitivity and signal distortion of large-scale shaft system low-strain measurement are solved; and meanwhile, the installation limitation of directly pasting the strain gauge on the shaft is avoided.

Description

Technical Field

[0001] This invention relates to the field of shaft stress measurement technology, specifically to a device and method for continuously measuring bending stress signals of rotating shaft segments. Background Technology

[0002] In existing technologies, bending moments on rotating shafts are typically measured using strain gauges. However, this method has many limitations in terms of installing strain gauges on rotating shafts and in measuring shaft strain.

[0003] If the transmission shaft system on a ship is large and the strain at the measurement point is too small, the strain gauge measurement value will be distorted due to the range limitation of the strain gauge. The installation process of the strain gauge is irreversible, so when installing it on the rotating shaft, it is necessary to ensure that the strain gauge is strictly aligned in both the horizontal and vertical directions. Due to the many uncertainties in the manual operation process, these factors may interfere with the accuracy of the strain gauge measurement.

[0004] Therefore, there is a need for a more accurate, reliable, and easy-to-install / disassemble strain measurement device and method. Summary of the Invention

[0005] The purpose of this application is to overcome the above-mentioned technical deficiencies and propose a device and method for continuously measuring the bending stress signal of a rotating shaft segment, thereby solving the technical problems of insufficient measurement sensitivity and difficulty in installing and disassembling strain gauges caused by the small strain of the shaft in the prior art.

[0006] To achieve the above-mentioned technical objectives, this application adopts the following technical solution: In a first aspect, this application provides a device for continuously measuring bending stress signals of a rotating shaft segment, comprising: A split chuck assembly is provided, which surrounds and is fixed on the outer circumferential surface of the rotating shaft to be measured, and the split chuck assembly is provided with at least two opposing mounting points along the rotating shaft. A test rod, the two ends of which are fixedly connected to two mounting points of the split chuck assembly, the test rod rotating synchronously with the rotating shaft and having a shaft diameter smaller than the rotating shaft, and a height difference between the surfaces of the test rod and the rotating shaft; and The signal acquisition module includes a strain gauge, a wireless strain acquisition device, and a power supply unit. The strain gauge is disposed on the surface of the test rod and is electrically connected to the wireless strain acquisition device and the power supply unit, respectively.

[0007] In some embodiments of this application, the split chuck assembly includes a first chuck half-ring and a second chuck half-ring that are detachably connected. The first chuck half-ring and the second chuck half-ring are connected and fastened together by a connector to form a ring structure with a central through hole. The test rod is fixed to the first chuck half-ring or the second chuck half-ring.

[0008] In some embodiments of this application, the connector includes a plurality of set bolts and a plurality of positioning nuts. The opposite end faces of the first chuck half-ring and the second chuck half-ring are symmetrically arranged with a plurality of mounting threaded holes. The positioning nuts are embedded in the first chuck half-ring. One end of the set bolt is connected to the mounting threaded hole of the second chuck half-ring, and the other end is screwed into the positioning nut through the mounting threaded hole of the first chuck half-ring.

[0009] In some embodiments of this application, a friction plate is also included, which is disposed between the set bolt and the rotating shaft. The concave surface of the friction plate matches the curvature of the outer diameter of the rotating shaft, and the outer surface of the friction plate abuts against the set bolt.

[0010] In some embodiments of this application, the first chuck semi-ring and the second chuck semi-ring are provided with through holes along the axial direction and pre-tightening threaded holes along the radial direction. The through holes pass through the mounting fulcrum, and the pre-tightening threaded holes communicate with the mounting fulcrum. The test rod is disposed through the through holes of the first chuck semi-ring and the second chuck semi-ring, and is locked and fixed by being embedded in the pre-tightening threaded holes with pre-tightening bolts.

[0011] In some embodiments of this application, the material of the test rod is the same as that of the rotating shaft to be tested, and the axis of the test rod is arranged parallel to the axis of the rotating shaft.

[0012] In some embodiments of this application, the power supply unit includes a battery module and a wireless inductive power supply module. The battery module is integrated and installed on the test rod or the split chuck assembly. Both the battery module and the wireless inductive power supply module are electrically connected to the wireless strain acquisition device.

[0013] In some embodiments of this application, the strain gauge is attached to a surface of the test rod away from or close to the rotation axis, and is aligned along the axial direction of the test rod.

[0014] In some embodiments of this application, an insulating gasket is provided at the connection between the test rod and the split chuck assembly.

[0015] Secondly, this application also provides a method for continuously measuring and amplifying bending stress signals of a rotating shaft segment, applicable to the continuous measurement and amplification device for bending stress signals of a rotating shaft segment as described in any embodiment of the first aspect, comprising the following steps: S1. Install and fix the split chuck assembly onto the rotating shaft to be tested, so that the test rod rotates synchronously with the rotating shaft; S2. When the rotating shaft is bent under force, the test rod deforms due to the height difference. The strain gauges attached to the surface of the test rod sense the deformation and generate an electrical signal. S3. Acquire the electrical signal using a wireless strain gauge and convert it into a digital signal; S4. The digital signal is wirelessly transmitted to the strain signal analysis system, and the bending stress of the rotating shaft is calculated in reverse based on the transfer function of the beam bending theory.

[0016] Compared with the prior art, the beneficial technical effects of the technical solution provided in this application include: By employing a structural design that maps the strain on the rod surface to the corresponding strain on the axial surface, and utilizing the height difference between the test rod and the rotating shaft surface, the strain measurement value is improved under the same stress on the axial surface. Since the test rod rotates synchronously with the rotating shaft and is fixed at both ends, when the rotating shaft bends, the test rod will undergo corresponding tensile or compressive deformation. The smaller shaft diameter of the test rod amplifies this deformation, thus avoiding the problem of small shaft deformation and strain measurement distortion caused by an excessively large shaft diameter. This improves the measurement sensitivity and signal-to-noise ratio. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in this application, the accompanying drawings used in the embodiments will be briefly described below: Figure 1 This is a schematic diagram of the structure of a bending stress signal amplification device according to an embodiment of this application; Figure 2 This is a schematic diagram of the structure of a split-type chuck assembly in an embodiment of this application; Figure 3 This is a force analysis diagram of a bending stress signal amplification device according to an embodiment of this application; Figure 4 This is a graph showing the amplification factor of a bending stress signal amplification device versus the trend of loading force in an embodiment of this application. Figure 5 This is a schematic diagram of the installation of a bending stress signal amplification device according to an embodiment of this application; Figure 6 This is a flowchart of a bending stress signal amplification method according to an embodiment of this application.

[0018] Figure label: Split-type chuck assembly 1, test rod 2, rotating shaft 3, strain gauge 4, wireless strain acquisition device 5, battery module 6, strain signal analysis system 7, hydraulic loading device 8, intermediate bearing 9; First chuck semi-ring 11, second chuck semi-ring 12, set bolt 13, positioning nut 14, preload bolt 15. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0020] Those skilled in the art will understand that, in this specification, the term "comprising" is an open-ended expression, meaning that the stated feature is present but other features are excluded. Directional terms such as "upper," "lower," "left," and "right" refer to exemplary directions based on the accompanying drawings. Features specified as "first" or "second" implicitly include one or more of that feature. Singular expressions can also be used in plural forms. "Multiple" means two or more. The terms "installed," "connected," and "linked" can refer to a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection via an intermediate medium, and it can be a connection within two components. Furthermore, "linked" can include wireless connections.

[0021] The purpose of this application is to overcome the above-mentioned technical deficiencies and propose a continuous measurement device for amplifying bending stress signals of a rotating shaft segment, thereby solving the technical problems of insufficient measurement sensitivity and difficulty in installing and disassembling strain gauges caused by excessively small shaft strain in the prior art.

[0022] To achieve the above-mentioned technical objectives, this application adopts the following technical solution: Reference Figures 1-6 A device for continuously measuring bending stress signals of a rotating shaft segment, comprising a split chuck assembly 1, a test rod 2, and a signal acquisition module.

[0023] The split-type chuck assembly 1 surrounds and is fixed to the outer circumferential surface of the rotating shaft 3 to be tested. The split-type chuck assembly 1 has at least two opposing mounting points along the axial direction of the rotating shaft 3. The two ends of the test rod 2 are respectively fixedly connected to the two mounting points of the split-type chuck assembly 1. At this time, the test rod 2 rotates synchronously with the rotating shaft 3, and the shaft diameter of the test rod 2 is smaller than that of the rotating shaft 3. There is a preset height difference between the surfaces of the test rod 2 and the rotating shaft 3, such as the height-adjustment design shown in the figure. The signal acquisition module includes a strain gauge 4, a wireless strain acquisition device 5, and a power supply unit. The strain gauge 4 is disposed on the surface of the test rod 2 and is electrically connected to the wireless strain acquisition device 5 and the power supply unit, respectively.

[0024] Working principle: See Figure 3 In the process, when the rotating shaft 3 is subjected to bending moments (such as F1 and F2 loading) and undergoes slight bending deformation, points A and B experience slight relative displacement. The split chuck assembly 1 deforms or displaces with the shaft, causing a change in the distance between the mounting supports, and points C and D subsequently shift relative to each other. Since the test rod 2 is rigidly connected between the supports and there is a height difference, the bending of the shaft is converted into axial tensile or compressive internal forces on the test rod 2. The strain gauge 4 captures the deformation signal on the test rod 2, which is amplified compared to the slight strain on the shaft surface, resulting in a higher signal-to-noise ratio. The wireless strain acquisition device 5 transmits the signal. This solves the problem of difficult measurement of surface strain in large-diameter shaft systems by achieving physical signal amplification through mechanical structural transformation, thus improving measurement sensitivity.

[0025] like Figure 2 As shown, the split-type chuck assembly 1 includes a first chuck semi-ring 11 and a second chuck semi-ring 12 that are detachably connected. The first chuck semi-ring 11 and the second chuck semi-ring 12 are mated and fastened together by a connector to form an annular structure with a central through hole. The test rod 2 is fixed to either the first chuck semi-ring 11 or the second chuck semi-ring 12.

[0026] During installation, the two semi-rings are placed on either side of the rotating shaft 3 and then fastened together using connectors. This simplifies the installation and disassembly process, allowing the device to be installed without disassembling the shaft system, and solves the problems of irreversible strain gauge installation and difficulty in reusing it.

[0027] Reference Figure 2The connector includes multiple set bolts 13 and multiple locating nuts 14. Multiple mounting threaded holes are symmetrically arranged on opposite end faces of the first chuck semi-ring 11 and the second chuck semi-ring 12. The locating nuts 14 are embedded in either the first chuck semi-ring 11 or the second chuck semi-ring 12. One end of each set bolt 13 connects to the mounting threaded hole of one of the first chuck semi-ring 11 and the second chuck semi-ring 12, and the other end is screwed into the locating nut 14 through the mounting threaded hole of the other. Typically, four high-strength flat-end hexagonal set bolts are used.

[0028] By tightening the set bolt 13, the two semi-rings are tightly gripped by the rotating shaft 3, and torque is transmitted by pressing against the shaft surface through the side of the bolt. This ensures that the split chuck and the rotating shaft move at the same rotational speed, and the connection is firm and reliable.

[0029] The device also includes a friction plate. The friction plate is disposed between the set bolt 13 and the rotating shaft 3. The concave surface of the friction plate matches the curvature of the outer diameter of the rotating shaft 3, and the outer surface of the friction plate abuts against the set bolt 13.

[0030] The set bolt 13 converts point contact into surface contact by pressing against the friction plate. This increases the friction area, ensuring the chuck and shaft system remain relatively stationary and preventing slippage; it also protects the rotating shaft surface from damage caused by the bolt. By replacing the friction plates with different curvatures, it can accommodate a certain range of shaft diameters without replacing the entire chuck.

[0031] Reference Figure 2 The first chuck semi-ring 11 and the second chuck semi-ring 12 are provided with through holes along the axial direction and pre-tightening threaded holes along the radial direction. The through holes pass through the mounting support point. The test rod 2 is inserted through the through holes of the first chuck semi-ring 11 and the second chuck semi-ring 12 and is locked and fixed by a pre-tightening bolt 15 embedded in the pre-tightening threaded hole.

[0032] After the test rod 2 is inserted into the through hole, the two ends of the test rod 2 are securely locked onto the chuck by inserting the radial preload bolts 15 into the preload threaded holes. This ensures that there is no relative slippage between the test rod and the chuck, guaranteeing the accuracy of strain transmission; and also facilitates the replacement of the test rod.

[0033] The test rod 2 is made of the same material as the rotating shaft 3 to be tested, and the axis of the test rod 2 is set parallel to the axis of the rotating shaft 3.

[0034] Since both are made of the same material, their physical properties, such as elastic modulus and coefficient of thermal expansion, are identical. Ensuring consistent response characteristics under stress, deformation, and temperature changes is crucial, resulting in a definite linear proportional relationship between the strain on the bar surface and the strain on the axial surface (e.g., ...). Figure 4As shown in the figure, it is convenient to accurately calculate and reverse the result using structural mechanics methods.

[0035] Reference Figure 2 The power supply unit includes a battery module 6 and a wireless inductive power supply module. The battery module 6 is integrated and installed on the test rod 2 or the split chuck assembly 1. Both the battery module 6 and the wireless inductive power supply module are electrically connected to the wireless strain acquisition device 5.

[0036] Short-term testing uses battery power; long-term or frequent start-stop testing can switch to wireless inductive power supply. This improves the device's environmental adaptability. The battery module is convenient and quick, while wireless inductive power supply solves the battery life problem for long-term monitoring.

[0037] The strain gauge 4 is attached to the side surface of the test rod 2 away from the rotation axis 3 or the side surface close to the rotation axis 3, and is aligned along the axial direction of the test rod 2.

[0038] The strain gauge senses the tensile and compressive deformation on the surface of the test rod. Compared to aligning strain gauges on a huge rotating shaft, it is much easier to pre-attach and align strain gauges on a small test rod, and this can be done in a laboratory environment, solving the problem of difficulty in ensuring alignment accuracy during manual on-site installation.

[0039] An insulating gasket is provided at the connection between the test rod 2 and the split chuck assembly 1.

[0040] Add an electrical insulation layer at the mechanical connection point. This prevents stray currents or electrostatic interference from the rotating shaft from interfering with the signal acquisition module, thus improving signal purity.

[0041] Reference Figure 1 The signal acquisition module is configured to convert the analog electrical signal sensed by the strain gauge 4 into a digital signal and transmit it wirelessly to the external strain signal analysis system 7.

[0042] The data acquisition unit 5 reads the resistance change, converts it to an analog-to-digital converter (AD), and then packages and sends the data. The analysis system 7 receives the data and calculates the true strain of the axial surface based on the linear relationship. This achieves non-contact data transmission, avoiding the wear and noise problems associated with contact measurements such as slip rings.

[0043] Reference Figures 3-6 This embodiment provides a method for strain amplification calculation and verification based on the beam bending theory of mechanics of materials.

[0044] An apparatus for continuously measuring bending stress signals of a rotating shaft segment as described in any embodiment of the first aspect includes the following steps: S1. Install and fix the split chuck assembly onto the rotating shaft to be tested, so that the test rod rotates synchronously with the rotating shaft; S2. When the rotating shaft is bent under force, the test rod deforms due to the height difference. The strain gauges attached to the surface of the test rod sense the deformation and generate an electrical signal. S3. Acquire the electrical signal using a wireless strain gauge and convert it into a digital signal; S4. The digital signal is wirelessly transmitted to the strain signal analysis system, and the bending stress of the rotating shaft is calculated in reverse based on the transfer function of the beam bending theory.

[0045] Specifically, a strain amplification system and shaft system force analysis model are established, including axial surface loading forces F1 and F2. Assuming the shaft is an elastic foundation beam, the two mounting supports of the split chuck assembly correspond to points C and D on the shaft, with a distance between them. l .

[0046] When F1 and F2 act on the shaft, the shaft undergoes bending deformation, causing relative displacement and rotation at the force analysis points C and D on the rod surface. For the rigidly connected test rod 2, this relative displacement generates internal forces within it.

[0047] According to beam bending theory, the differential equation for the bending of a shaft is:

[0048] This is the fundamental differential equation in beam bending theory, also known as the Euler-Bernoulli beam equation. Here, EI represents the bending stiffness (E is the modulus of elasticity, and I is the moment of inertia of the section), reflecting the overall ability of the axis to resist bending deformation. The load density term represents the rate of change of load distribution per unit length, and is a direct manifestation of the bending differential equation; q(x) is the distributed load function, representing the lateral load per unit length. This equation originates from the synthesis of internal force equilibrium, geometric relations, and linear elastic constitutive relations, and can determine the deflection, rotation angle, curvature, bending moment, and shear force distribution of the shaft after being subjected to force.

[0049] By solving the above differential equation (in conjunction with boundary conditions), the deflection of the shaft can be obtained. and corner : .

[0050] Then the rotation angle and deflection of points C and D can be calculated:

[0051]

[0052] Because the test rod is rigidly connected to the chuck, the relative rotation angle and relative deflection between points C and D will cause internal forces to be generated inside the test rod. Let... The bending stiffness coefficient of the test rod is denoted as . Let be the shear stiffness coefficient of the test rod, then the bending moment experienced by the test rod... and shear force They are respectively:

[0053]

[0054] Within the range of small elastic deformation and It has a linear relationship with loads F1 and F2, therefore and It can also be represented as a linear combination of F1 and F2:

[0055]

[0056] Where a, b, c, and d are transfer coefficients, which depend on the shaft length, support conditions, bending stiffness EI, and stiffness characteristics of the test rod, and can be determined through structural mechanics methods (such as finite element analysis or analytical calculation). Therefore, the forces (bending moment, shear force) on test rod 2 have a definite linear relationship with the forces F1 and F2 on the shaft, and can be accurately calculated using structural mechanics methods.

[0057] like Figure 4 and Figure 5 The figures show the trend of the amplification factor of a strain gauge amplification device as a function of the applied force and its installation diagram in a shaft system. Taking a strain gauge amplification device with a rod length of 0 mm, a rod diameter of 8 mm, and a height difference of 50.5 mm between the rod surface and the shaft surface as an example, it is installed in a shaft system with a length of 2.1 m and a diameter of 190 mm. The shaft system structure includes two sets of hydraulic loading devices 8 and two intermediate bearings 9 as supports.

[0058] Simulation results show that under different loading forces, the maximum strain on the rod surface is basically at the same level, and the overall distribution is linear. Moreover, as the loading force increases within a certain range, the strain amplification factor gradually approaches 223%, demonstrating that the device has good strain amplification performance.

[0059] The signal amplification capability of the device was quantified using specific parameters (223% magnification), demonstrating that the height difference (50.5mm) design can significantly improve the measurement signal strength of minute strains. A definite linear relationship between the force on the test rod and the force on the shaft system was established, and a precise calculation method based on structural mechanics was provided. This allows users to accurately infer the true force on the shaft system by measuring the strain of the test rod and using the linear coefficient, ensuring the scientific rigor and accuracy of the measurement.

[0060] To further improve the performance of the present invention, the device also includes: The standard friction plate can be designed as a set of replaceable parts with different radii of curvature, each corresponding to a different specification of the outer diameter of the rotating shaft, and can be used with set bolts of different lengths to achieve compatibility with multiple shaft diameters.

[0061] The inner diameter of the split chuck assembly is designed to be larger than the outer diameter of the rotating shaft. The two are only in contact through set bolts and friction plates, forming a suspended support, which reduces the requirements for the machining accuracy of the chuck's inner hole.

[0062] The system is equipped with a remote terminal and has a human-machine interface that displays real-time strain curves and calibration parameters.

[0063] A mechanical overload protection structure is installed between the fixed points at both ends of the test rod. When the deformation exceeds the threshold, the test rod contacts the boss. This prevents accidental overload of the shaft system from causing plastic deformation or damage to the precision test rod.

[0064] The device also includes a temperature-compensated reference unit, namely the second test rod, on which a temperature-compensated strain gauge is attached and connected to a Wheatstone bridge. This compensates for thermal output and eliminates the influence of ambient temperature changes on the measurement.

[0065] The split chuck assembly has a streamlined fairing covering its windward side. This optimizes aerodynamic shape, reduces wind resistance and aerodynamic noise, and protects internal components from dust and oil.

[0066] Compared with the prior art, the beneficial technical effects of the technical solution provided in this application include: When the drive shaft rotates, it drives the split chuck and test rod to rotate synchronously. The bending of the shaft system causes relative displacement between the two support points of the chuck, forcing the rigidly connected test rod to undergo tensile or compressive deformation. Because the distance from the rod surface to the neutral layer differs from that of the shaft surface, and because of the difference in structural stiffness, the strain signal on the test rod is effectively amplified. The strain gauge senses this deformation, and its resistance changes. This change is converted into a digital signal by the wireless acquisition unit and transmitted to the analysis system. The analysis system then uses a preset linear scaling factor to infer the true strain of the rotating shaft.

[0067] This design solves the problem of measuring minute strain in large-size shaft systems by amplifying the signal through structural design to avoid distortion. The split-type chuck design eliminates the need to disassemble the shaft system during installation, and the strain gauges are pre-fabricated on the rod, avoiding the tediousness and irreversibility of on-site pasting. It also avoids the problem of poor alignment accuracy associated with manual on-site pasting, and the use of homogeneous materials and wireless transmission ensures the accuracy and stability of the data.

[0068] Those skilled in the art will understand that the steps, measures, and schemes in the various operations, methods, processes, and procedures discussed in this application can be alternated, modified, rearranged, decomposed, combined, or deleted.

[0069] The specific embodiments described above do not constitute a limitation on the scope of protection of this application. Any other corresponding changes and modifications made based on the technical concept of this application should be included within the scope of protection of the claims of this application.

Claims

1. A device for continuously measuring bending stress signals of a rotating shaft segment, characterized in that, include: A split chuck assembly is provided, which surrounds and is fixed on the outer circumferential surface of the rotating shaft to be measured, and the split chuck assembly is provided with at least two opposing mounting points along the rotating shaft. The test rod has its two ends fixedly connected to two mounting points of the split chuck assembly. The test rod rotates synchronously with the rotating shaft and its shaft diameter is smaller than that of the rotating shaft. There is a height difference between the surfaces of the test rod and the rotating shaft. as well as The signal acquisition module includes a strain gauge, a wireless strain acquisition device, and a power supply unit. The strain gauge is disposed on the surface of the test rod and is electrically connected to the wireless strain acquisition device and the power supply unit, respectively.

2. The amplification device for continuously measuring the bending stress signal of a rotating shaft segment according to claim 1, characterized in that, The split chuck assembly includes a first chuck half-ring and a second chuck half-ring that can be detachably connected. The first chuck half-ring and the second chuck half-ring are connected and fastened together by a connector to form a ring structure with a central through hole. The test rod is fixed to the first chuck half-ring or the second chuck half-ring.

3. The amplification device for continuously measuring the bending stress signal of a rotating shaft segment according to claim 2, characterized in that, The connector includes multiple set bolts and multiple positioning nuts. Multiple mounting threaded holes are symmetrically arranged on the opposite end faces of the first chuck half-ring and the second chuck half-ring. The positioning nuts are embedded in the first chuck half-ring. One end of the set bolt is connected to the mounting threaded hole of the second chuck half-ring, and the other end is screwed into the positioning nut through the mounting threaded hole of the first chuck half-ring.

4. The amplification device for continuously measuring the bending stress signal of a rotating shaft segment according to claim 3, characterized in that, It also includes a friction plate, which is disposed between the set bolt and the rotating shaft. The concave surface of the friction plate matches the curvature of the outer diameter of the rotating shaft, and the outer surface of the friction plate abuts against the set bolt.

5. The amplification device for continuously measuring the bending stress signal of a rotating shaft segment according to claim 2, characterized in that, The first chuck semi-ring and the second chuck semi-ring are provided with through holes along the axial direction and pre-tightening threaded holes along the radial direction. The through holes pass through the mounting fulcrum, and the pre-tightening threaded holes are connected to the mounting fulcrum. The test rod is provided through the through holes of the first chuck semi-ring and the second chuck semi-ring, and is locked and fixed by being embedded in the pre-tightening threaded holes with pre-tightening bolts.

6. The continuously measuring rotating shaft segment bending stress signal amplification device according to claim 1, characterized in that, The test rod is made of the same material as the rotating shaft, and the axis of the test rod is set parallel to the axis of the rotating shaft.

7. The amplification device for continuously measuring bending stress signals of a rotating shaft segment according to claim 1, characterized in that, The power supply unit includes a battery module and a wireless inductive power supply module. The battery module is integrated and installed on the test rod or the split chuck assembly. Both the battery module and the wireless inductive power supply module are electrically connected to the wireless strain acquisition device.

8. The amplification device for continuously measuring the bending stress signal of a rotating shaft segment according to claim 1, characterized in that, The strain gauge is attached to the side surface of the test rod away from or close to the rotation axis, and is aligned along the axial direction of the test rod.

9. The amplification device for continuously measuring the bending stress signal of a rotating shaft segment according to claim 1, characterized in that, An insulating gasket is provided at the connection between the test rod and the split chuck assembly.

10. A method for continuously measuring and amplifying bending stress signals of a rotating shaft segment, characterized in that, An apparatus for continuously measuring bending stress signals of a rotating shaft segment as described in any one of claims 1-9, comprising the following steps: Install and fix the split chuck assembly onto the rotating shaft to be tested, so that the test rod rotates synchronously with the rotating shaft. When the rotating shaft is bent under force, the test rod deforms due to the height difference. The strain gauges attached to the surface of the test rod sense the deformation and generate electrical signals. The electrical signal is acquired by a wireless strain gauge and converted into a digital signal. The digital signal is wirelessly transmitted to the strain signal analysis system, and the bending stress of the rotating shaft is calculated in reverse based on the transfer function of the beam bending theory.

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