A batch testing device for the internal contact state of bearings based on an annular groove structure

Abstract

This invention discloses a batch testing device for the internal contact state of bearings based on a circumferential groove structure, relating to the field of bearing testing technology. It includes a testing support, a receiving groove formed on the testing support, and a circumferential testing module disposed within the receiving groove. The circumferential testing module includes a circumferential bearing plate and a testing system disposed on the circumferential bearing plate. A circumferential groove is formed on the circumferential bearing plate, and a conformal sensing module is disposed within the circumferential groove. Multiple conformal sensing modules are disposed within the circumferential groove. The number of conformal sensing modules within the circumferential groove is greater than the number of rollers in the bearing's load-bearing area, ensuring both support strength and monitoring the stress state of the rollers in different orientations.

Description

Technical Field

[0001] This invention relates to the field of bearing testing technology, and more specifically to a batch testing device for the internal contact state of bearings based on an annular groove structure. Background Technology

[0002] Bearings, as a crucial component of mechanical equipment, support rotating parts and reduce friction during operation. Their internal contact conditions (including the magnitude and distribution of contact forces, and the integrity of the raceway surface) directly determine the bearing's operational accuracy, service life, and reliability, thus affecting the overall stability of the mechanical equipment. Currently, the detection of internal contact forces and raceway conditions in bearings primarily employs the strain gauge bonding method. By bonding strain gauges to the outer ring, inner ring, or near the raceway of the bearing, the strain-resistance characteristics of the strain gauges convert the contact stress during bearing operation into an electrical signal, thereby enabling the detection of the contact condition. However, this method suffers from several insurmountable drawbacks, severely limiting its detection efficiency and application scenarios, as follows: 1. Extremely low testing efficiency, unable to achieve batch testing: Existing methods require individual strain gauge arrangement for each bearing to be tested, and the preparation work for each bearing takes a long time, which greatly increases the testing cost and production cycle.

[0003] 2. The testing process is destructive and affects bearing performance: During the strain gauge bonding process, the bearing surface needs to be ground, cleaned, and even the surface anti-rust layer needs to be removed, which will cause certain damage to the bearing surface. At the same time, the bonded strain gauges and connecting wires will protrude from the bearing surface, which may interfere with the normal assembly and operation of the bearing. Especially for precision bearings, this will seriously affect their operating accuracy and service life.

[0004] 3. Poor adaptability and limited detection range: The bonding position of the strain gauge is limited by the bearing structure. For bearings with complex structures and small dimensions, it is difficult to find a suitable bonding position. In addition, the strain gauge itself has a certain volume and rigidity, which cannot be completely fitted with the curved surfaces of the bearing raceway, inner and outer rings, etc., resulting in deviations in the detection signal and failing to accurately reflect the actual contact state inside the bearing.

[0005] 4. High maintenance costs and poor reusability: Strain gauges pasted on the outer or inner ring surface of the bearing are mostly for single use. Disassembly can easily damage the bearing surface and the strain gauges themselves, making them unusable and further increasing testing costs.

[0006] Existing technologies include several intelligent bearing detection solutions, such as external and embedded sensors. External sensors are attached to the bearing's outer ring or cage, maintaining the bearing's integrity but altering its overall dimensions. They cannot fit the internal structure of existing bearing housings, making installation inconvenient and limiting their monitoring range. Embedded sensors require slotting or drilling into the bearing; while this allows for closer proximity to the signal source and improved accuracy, it compromises the bearing's integrity and performance. Furthermore, it cannot perform batch testing and can easily cause plastic deformation in some test structures.

[0007] Therefore, it is necessary to develop and design a batch detection device for the internal contact state of bearings based on the circumferential groove structure. This device should be able to ensure the support strength and monitor the stress state of the rollers in different positions without damaging the bearing. This is a technical problem that needs to be solved by those skilled in the art. Summary of the Invention

[0008] To address the aforementioned issues, this invention provides a batch detection device for the internal contact state of bearings based on a circumferential groove structure. Without damaging the bearing, it can both ensure support strength and monitor the stress state of the rollers in different positions.

[0009] To achieve the above objectives, the present invention provides the following solution: A batch testing device for the internal contact state of bearings based on a circumferential groove structure includes a testing support, a receiving groove formed on the testing support, and a circumferential testing module disposed in the receiving groove. The circumferential testing module includes a circumferential bearing plate and a conformal sensing module disposed on the circumferential bearing plate. The circumferential bearing plate has a circumferential groove, and multiple conformal sensing modules are disposed in the circumferential groove. The number of conformal sensing modules disposed in the circumferential groove is greater than the number of rollers in the bearing bearing area to be tested.

[0010] Preferably, the circumferential groove is disposed at one end of the circumferential bearing plate near the outer ring of the bearing.

[0011] Preferably, the circumferential groove is disposed at one end of the circumferential bearing plate near the detection support.

[0012] Preferably, the circumferential detection module further includes a signal acquisition module and a power supply module respectively disposed at both ends of the circumferential support plate, and a data transmission module electrically connected to the conformal sensing module, the signal acquisition module and the power supply module.

[0013] Preferably, the conformal sensing module is bonded to the circumferential groove.

[0014] Preferably, the cross-section of the circumferential bearing plate is a semi-circular structure.

[0015] Preferably, the conformal sensing module is one of a flexible strain gauge, a carbon nanotube flexible sensing film, or a fiber optic grating sensing strip.

[0016] Preferably, the signal acquisition module includes a signal conditioning circuit for amplifying, filtering, and denoising the electrical signal output by the conformal sensing module, an A / D converter for converting the conditioned analog signal into a digital signal, and a microcontroller for controlling the frequency and timing of signal acquisition and performing preliminary processing on the digital signal. The data transmission module uses wireless or wired transmission, and the power supply module is a rechargeable lithium battery or a button battery.

[0017] Preferably, a flexible substrate is provided between the conformal sensing module and the circumferential groove.

[0018] The present invention achieves the following technical effects compared to the prior art: By creating circumferential grooves on the circumferential bearing plate and placing conformal sensing modules within these grooves, the support strength of the bearing plate is improved. Simultaneously, multiple conformal sensing modules can be arranged along the circumferential direction within the grooves, with the number exceeding the number of rollers in the bearing area. Arranging a certain number of conformal sensing modules on both sides of the strain measurement points in the bearing area yields more accurate detection results, and the added measurement points on both sides can verify the correctness of the signals in the bearing area. Furthermore, adding strain measurement points along the circumferential direction enables strain monitoring when the measurement point is directly below the roller and between two adjacent rollers, allowing for monitoring of the stress state of the rollers in different orientations. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Appendix Figure 1 This is a schematic diagram of the bearing structure to be tested in the batch detection device for the internal contact state of bearings based on the circumferential groove structure disclosed in this invention. Appendix Figure 2 This is a three-dimensional structural diagram of the circumferential bearing plate of the batch detection device for the internal contact state of bearings based on the circumferential groove structure disclosed in this invention. Appendix Figure 3 This is a top view structural schematic diagram of the circumferential detection module of the batch detection device for the internal contact state of bearings based on the circumferential groove structure disclosed in this invention. Appendix Figure 4 This is a schematic diagram of the overall three-dimensional structure of the batch detection device for the internal contact state of bearings based on the circumferential groove structure disclosed in this invention. Appendix Figure 5 This is a schematic cross-sectional view of the bearing internal contact state batch detection device based on the circumferential groove structure disclosed in this invention, after the circumferential detection module is embedded in the detection support. The components include: 1. Detection support; 2. Bearing outer ring; 3. Bearing inner ring; 4. Roller; 5. Circumferential bearing plate; 6. Circumferential groove; 7. Conformal sensing module; 8. Receiving groove; 9. Signal acquisition module; 10. Power supply module; 11. Wiring trough; 12. Signal line; 13. Flexible substrate; and 14. Circumferential detection module. Detailed Implementation

[0021] 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. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] The purpose of this invention is to provide a batch detection device for the internal contact state of bearings based on a circumferential groove structure, which can ensure the support strength and monitor the stress state of the rollers when they are in different positions without damaging the bearing.

[0023] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] refer to Figures 1-5 The batch detection device for the internal contact state of bearings based on a circumferential groove structure disclosed in this embodiment of the invention includes at least a detection support 1. The detection support 1 has a receiving groove 8, and a circumferential detection module 14 is disposed within the receiving groove 8. The circumferential detection module 14 includes a circumferential bearing plate 5, a conformal sensing module 7 is disposed on the circumferential bearing plate 5, and a circumferential groove 6 is formed on the circumferential bearing plate 5. Multiple conformal sensing modules 7 are disposed within the circumferential groove 6. Within the enclosing area of ​​the conformal sensing modules 7, along the radial direction of the conformal sensing modules 7... The number of conformal sensing modules 7 in the circumferential groove 6 is greater than the number of rollers 4 in the bearing area of ​​the bearing under test. Arranging more conformal sensing modules 7 on both sides of the strain measurement point in the bearing area than the number of rollers 4 in the bearing area of ​​the bearing under test can obtain more accurate detection results. In addition, the added measurement points on both sides can verify the correctness of the signal in the bearing area. Furthermore, adding strain measurement points along the circumferential direction can realize strain monitoring when the measurement point is directly below the roller 4 and when the measurement point is between two adjacent rollers. It can realize the monitoring of the stress state when the roller 4 is in different positions.

[0025] refer to Figure 3In one implementation, the conformal sensing module 7 has a signal acquisition module 9 and a power supply module 10 respectively disposed at both ends of the circumferential support plate 5, and also includes a data transmission module. The data transmission module is electrically connected to the conformal sensing module 7, the signal acquisition module 9, and the power supply module 10. The conformal sensing module 7 is disposed on the circumferential support plate 5, and the signal acquisition module 9 and the power supply module 10 are integrated at both ends of the circumferential support plate 5, and are equipped with a data transmission module electrically connected to the conformal sensing module 7, the signal acquisition module 9, and the power supply module 10, forming an integrated closed loop of "sensing-acquisition-power supply-transmission". The detection link can amplify, filter, and digitize the internal contact state signal of the bearing captured by the conformal sensing module 7 through the signal acquisition module 9, and then upload it to an external terminal for analysis in real time through the data transmission module. This eliminates the need for complex external measuring instruments and cables, simplifying the setup process of the detection system and improving the convenience of on-site operation. At the same time, the power supply module 10 provides an independent power supply for the entire detection link, enabling the device to continuously complete the batch bearing detection task even when disconnected from an external power source. This is especially suitable for application scenarios such as production line inspection and on-site maintenance where there is a lack of fixed power supply.

[0026] It should be noted that the inner diameter of the circumferential bearing plate 5 is adapted to the outer diameter of the bearing to be tested, and the outer diameter of the circumferential bearing plate 5 is adapted to the inner diameter of the testing support 1, enabling rapid assembly and positioning with the bearing without causing wear on the bearing surface. The bearing to be tested includes the inner ring 3, rollers 4, and outer ring 2. The circumferential groove 6 is a through-type annular groove, and the conformal sensing module 7 can be directly embedded in the groove for convenient installation. When the sensing module malfunctions, it can be quickly removed from the circumferential groove 6 for replacement, making maintenance convenient without disassembling the entire sensing body, thus reducing maintenance costs and difficulty. The width and depth of the circumferential groove 6 can be flexibly designed according to different types and sizes of bearings. By simply replacing the sensing body of the corresponding size (with the matching circumferential groove 6 and conformal sensing module 7), the testing of bearings of different specifications can be achieved without designing a separate sensing structure for each type of bearing, resulting in strong versatility and reducing the investment cost of testing equipment. Compared with the shortcomings of embedded sensors that require separate slotting for bearings of different sizes, the circumferential groove 6 structure of this invention has better adaptability.

[0027] The thickness of the circumferential bearing plate 5 is less than the depth of the receiving groove 8. When the bearing is fitted onto the detection support 1, the structure of the circumferential groove 6 will not interfere with the detection support 1, nor will it change the assembly size and operating accuracy of the bearing. This solves the problem of traditional strain gauges and external sensors interfering with the bearing assembly and operation.

[0028] In one embodiment, the circumferential groove 6 is located at one end of the circumferential bearing plate 5 near the outer ring 2 of the bearing. This allows the conformal sensing module 7 to be directly adjacent to the strain signal source, shortening the transmission path of the strain on the surface of the outer ring 2 of the bearing to the sensing module, reducing the attenuation and delay of the signal by the intermediate medium, thereby improving the detection sensitivity and response speed. At the same time, this position allows the heat dissipation holes and heat dissipation grooves to directly face the heat source (outer ring 2 of the bearing), shortening the heat conduction distance, improving heat dissipation efficiency, and more effectively dissipating the heat accumulated at the bottom of the circumferential groove 6. In addition, the arrangement of the circumferential groove 6 near the outer ring allows for a complete solid structure on the side of the bearing plate near the detection support 1, which helps to ensure the fit stiffness and positioning accuracy between the circumferential bearing plate 5 and the receiving groove 8, achieving synergistic optimization in terms of signal quality, thermal management, and structural stability.

[0029] refer to Figure 3 In one implementation, the circumferential groove 6 is located at one end of the circumferential bearing plate 5 near the detection support 1. This effectively avoids creating grooves on the mating surface between the circumferential bearing plate 5 and the bearing outer ring 2, thus ensuring a continuous and complete rigid contact surface between the bearing outer ring 2 and the circumferential bearing plate 5. This facilitates the transmission of surface strain of the bearing outer ring 2 to the main body of the circumferential bearing plate 5 with minimal loss, and then to the conformal sensing module 7 at the bottom of the circumferential groove 6 via the bearing plate. While ensuring a clear signal transmission path, this avoids interruption of stress transmission or local stress concentration caused by grooves on the mating surface, which would affect the detection accuracy. At the same time, the circumferential groove 6 is located on the side near the detection support 1, allowing the side of the circumferential bearing plate 5 near the bearing outer ring 2 to retain a complete solid wall thickness. This effectively improves the structural rigidity and compressive strength of the mating surface between the bearing plate and the bearing outer ring 2, preventing local deformation under radial loads.

[0030] As a preferred method, the conformal sensing module 7 is attached to the circumferential groove 6, which facilitates the installation of the conformal sensing module 7.

[0031] refer to Figure 2 As a preferred approach, the cross-section of the circumferential bearing plate 5 is a semi-circular structure. The semi-circular structure allows multiple sensing modules to be arranged in a space-limited bearing area, which facilitates the unified management of the signal line bundles 12 and helps to improve integration and assembly efficiency. It is especially suitable for batch testing scenarios of large bearings under heavy load, low speed or with significant changes in the force in the bearing area.

[0032] As one implementation method, the thickness of the circumferential bearing plate 5 is 2% to 3% of the outer diameter of the bearing to be measured. This thickness is thin enough that the small strain generated by the outer ring 2 of the bearing under radial load can be transmitted to the conformal sensing module 7 at the bottom of the crest groove with a low attenuation rate, ensuring the sensitivity and authenticity of the detection signal. Moreover, this thickness is sufficient to maintain the structural stiffness and fatigue strength of the bearing plate under repeated stress, avoiding plastic deformation or fracture due to excessive wall thickness, while ensuring that excessive deformation does not occur during assembly and disassembly, and ensuring the reusability accuracy of the sensing unit.

[0033] refer to Figure 4 In one implementation, the conformal sensing module 7 is one of a flexible strain gauge, a carbon nanotube flexible sensing film, or a fiber optic grating sensing strip.

[0034] refer to Figure 1 In one implementation, the signal acquisition module 9 includes a signal conditioning circuit, an A / D converter, and a microcontroller. The signal conditioning circuit amplifies, filters, and denoises the weak electrical signal output from the conformal sensing module 7, removing external interference signals (such as electromagnetic interference) and improving the signal-to-noise ratio. The A / D converter converts the conditioned analog signal into a digital signal. The microcontroller controls the frequency and timing of signal acquisition and performs preliminary processing on the digital signal (such as data calibration and anomaly identification) to ensure the accuracy and stability of the detected signal. The signal acquisition module 9 is integrated at the end of the sensing body, is compact, and does not affect the assembly of the sensing body and the bearing.

[0035] The data transmission module adopts wireless transmission (such as Bluetooth, WiFi, LoRa) or wired transmission. Wireless transmission enables contactless data transmission, avoiding interference from wires to bearing operation and batch testing, and is suitable for large-scale batch testing scenarios. Wired transmission uses waterproof and wear-resistant shielded wires, which is suitable for scenarios with high requirements for data transmission stability. The data transmission module can transmit the test data processed by the signal acquisition module 9 to external terminals (such as computers and testing instruments) in real time, realizing real-time monitoring and analysis of the data.

[0036] The power supply module 10 uses a rechargeable lithium battery or button battery, which is integrated into the end of the sensor body. It is small in size and has a long battery life. A single charge can meet the batch testing needs of at least 100 bearings. At the same time, the power supply module 10 has a low battery reminder function, which makes it easy to charge or replace the battery in time and ensure the continuous operation of the testing work.

[0037] It should be noted that when the data transmission module adopts wired transmission, an annular wiring groove 11 is provided in the circumferential groove 6, the signal line 12 is set in the wiring groove 11, and the signal acquisition module 9 and the power supply module 10 are set on the side of the circumferential support plate 5 close to the receiving groove 8, which facilitates wiring.

[0038] refer to Figure 3 As one implementation method, a flexible substrate 13 is provided between the conformal sensing module 7 and the circumferential groove 6, which can effectively buffer the vibration and impact loads transmitted to the bottom of the circumferential groove 6 during the operation of the bearing, reduce the risk of sensor damage or signal distortion due to instantaneous overload, and extend the service life of the sensing module; at the same time, the flexible substrate 13 can absorb the thermal stress generated between the circumferential bearing plate 5 and the conformal sensing module 7 due to the difference in thermal expansion coefficients to a certain extent, avoid the sensing module from delaminating or shifting position due to temperature changes, and improve the long-term stability of the detection signal.

[0039] During testing, whenever a roller 4 rolls over a measurement point corresponding to a conformal sensing module 7, the conformal sensing module 7 will output a weak electrical signal. Then, the signal acquisition module 9 can amplify, filter, and denoise the signal. The conditioned signal can be transmitted wirelessly or via wired transmission to a computer or testing instrument for analysis.

[0040] In addition, the advantages of the present invention also include the following: 1. Strong conformal fit and high detection accuracy: The circumferential detection module 14 is perfectly adapted to the outer surface of the bearing, which can achieve a tight conformal fit with a very small fit gap (not greater than 0.1mm). This ensures the strain transmission efficiency from the surface of the outer ring 2 of the bearing to the bottom surface of the circumferential groove 6 of the circumferential detection module 14. There is no extra conductive medium between the conformal sensing module 7, the signal acquisition module 9, and the power supply module 10, resulting in more realistic sensing signals that can accurately reflect the actual working conditions of the bearing.

[0041] 2. Reusable and low testing cost: The circumferential testing module 14 is an independent structure and does not need to be pasted on the bearing surface. During testing, the bearing and the sensing body can be assembled. After the test is completed, the bearing can be quickly disassembled. The sensing unit can be reused, which greatly reduces the testing cost and avoids the waste of traditional strain gauges that are used only once.

[0042] 3. Non-destructive testing, does not affect bearing performance: During the testing process, there is no need to grind or clean the bearing surface, which will not damage the bearing surface and anti-rust layer, nor will it interfere with the normal assembly and operation of the bearing. It is suitable for the testing of precision bearings and solves the problem of damage to bearings caused by traditional strain gauge testing and embedded sensor testing.

[0043] 4. High degree of integration and convenient operation: The conformal sensing module 7, signal acquisition module 9, data transmission module and power supply module 10 are integrated on the sensing body. The structure is compact and the size is small. There is no need to arrange complicated wiring and equipment. During operation, you only need to put the bearing on the sensing body and start the detection. No professional operators are required, which reduces the difficulty of operation.

[0044] 5. Multi-parameter synchronous detection with comprehensive functions: It can simultaneously detect the magnitude and distribution of internal contact forces in the bearing, as well as the wear, scratches, fatigue spalling, and other conditions on the raceway surface. Compared with traditional single-parameter detection schemes, it can more comprehensively reflect the internal contact state of the bearing, providing richer data support for bearing quality assessment and fault diagnosis. It functions similarly to a multi-parameter sensor but is more suitable for batch testing scenarios.

[0045] Furthermore, the circumferential groove 6 structure is a key structure for achieving batch testing, improving testing accuracy, and enhancing adaptability in this invention. Its advantages are mainly reflected in the following aspects: 1. The circumferential groove 6 is a through-type annular groove, which has little impact on the structural form of the conformal sensor body and does not require additional machining of the lead groove in the circumferential direction. This makes it less affected by the rigidity of the overall structure and less damaging to the overall stability of the bearing, thus extending the service life of the conformal sensor body structure.

[0046] 2. The circumferential groove 6 is a through-type annular groove. More dense strain measurement points can be arranged on the circumferential groove along the circumferential direction to realize the monitoring of the roller stress state in more directions.

[0047] 3. The circumferential groove 6 is a through-type annular groove, which facilitates wire lead-out: there is no need to process additional wire lead-out grooves through the circumferential direction. When performing wired transmission, the signal line can be directly led out through its annular groove, ensuring the stability of signal transmission during the detection process.

[0048] 4. Convenient machining: The circumferential groove 6 structure does not require additional machining of the lead wire groove that runs through the circumferential direction. Only circumferential grooving is required. Determining the axial position and grooving size of the circumferential groove can improve machining efficiency.

[0049] 5. Precise positioning of the conformal sensing module improves detection accuracy: The position and dimensions of the circumferential groove 6 precisely correspond to the contact pairs of the bearing roller raceways, enabling precise positioning and fixation of the conformal sensing module 7. This prevents displacement of the conformal sensing module 7 during detection, ensuring a tight fit between the conformal sensing module 7 and the circumferential detection module 14, thereby improving the accuracy and stability of the detection signal. Simultaneously, the circumferential groove 6 structure protects the conformal sensing module 7, preventing wear or damage during detection and extending its service life.

[0050] 6. Does not affect bearing assembly and operation: The circumferential groove 6 structure is formed on the outer surface of the circumferential detection module 14 and does not protrude from the assembly surface of the circumferential detection module 14. When the bearing is fitted on the sensing body, the circumferential groove 6 structure will not interfere with the detection support 1, nor will it change the assembly size and operating accuracy of the bearing, thus solving the problem of interference with bearing assembly and operation by traditional strain gauges and external sensors.

[0051] 7. Adaptable to different bearing sizes, highly versatile: The width and depth of the circumferential groove 6 structure can be flexibly designed according to different types and sizes of bearings. Simply replacing the corresponding circumferential detection module 14 (with a matching circumferential groove structure and conformal sensing module) enables the detection of bearings of different specifications. There is no need to design a separate sensing structure for each bearing, resulting in high versatility and reduced investment costs for testing equipment. Compared to the drawback of embedded sensors requiring separate slotting for different bearing sizes, the circumferential groove 6 structure of this invention offers superior adaptability.

[0052] 8. Facilitates the installation and maintenance of the conformal sensing module: The circumferential groove 6 is a through-type annular groove, and the conformal sensing module 7 can be directly embedded in the groove, making installation convenient; when the sensing module fails, it can be quickly removed from the circumferential groove structure for replacement, making maintenance convenient without disassembling the entire sensing body, thus reducing maintenance costs and difficulty.

[0053] It should be noted that, for those skilled in the art, it is obvious that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A batch testing device for the internal contact state of bearings based on a circumferential groove structure, characterized in that, The device includes a testing support (1), a receiving groove (8) opened on the testing support (1), and a circumferential testing module (14) disposed in the receiving groove (8). The circumferential testing module (14) includes a circumferential bearing plate (5) and a conformal sensing module (7) disposed on the circumferential bearing plate (5). A circumferential groove (6) is opened on the circumferential bearing plate (5), and a plurality of the conformal sensing modules (7) are disposed in the circumferential groove (6). The number of conformal sensing modules (7) disposed in the circumferential groove (6) is greater than the number of bearing area rollers (4) of the bearing to be tested.

2. The batch detection device for the internal contact state of bearings based on a circumferential groove structure according to claim 1, characterized in that, The circumferential groove (6) is located at one end of the circumferential bearing plate (5) near the outer ring (2) of the bearing.

3. The batch detection device for the internal contact state of bearings based on a circumferential groove structure according to claim 1, characterized in that, The circumferential groove (6) is located at one end of the circumferential bearing plate (5) near the detection support (1).

4. The batch detection device for the internal contact state of bearings based on a circumferential groove structure according to claim 1, characterized in that, The circumferential detection module (14) further includes a signal acquisition module (9) and a power supply module (10) respectively disposed at both ends of the circumferential bearing plate (5), and a data transmission module electrically connected to the conformal sensing module (7), the signal acquisition module (9) and the power supply module (10).

5. The batch detection device for the internal contact state of bearings based on a circumferential groove structure according to claim 1, characterized in that, The conformal sensing module (7) is attached to the circumferential groove (6).

6. The batch detection device for the internal contact state of bearings based on a circumferential groove structure according to claim 4, characterized in that, The cross-section of the circumferential bearing plate (5) is a semi-circular structure.

7. The batch detection device for the internal contact state of bearings based on a circumferential groove structure according to claim 4, characterized in that, The conformal sensing module (7) is one of a flexible strain gauge, a carbon nanotube flexible sensing film, or a fiber optic grating sensing strip.

8. The batch detection device for the internal contact state of bearings based on a circumferential groove structure according to claim 4, characterized in that, The signal acquisition module (9) includes a signal conditioning circuit for amplifying, filtering and denoising the electrical signal output by the conformal sensing module (7), an A / D converter for converting the conditioned analog signal into a digital signal, and a microcontroller for controlling the frequency and timing of signal acquisition and performing preliminary processing on the digital signal. The data transmission module adopts wireless or wired transmission, and the power supply module (10) is a rechargeable lithium battery or a button battery.

9. The batch detection device for the internal contact state of bearings based on a circumferential groove structure according to claim 4, characterized in that, A flexible substrate (13) is provided between the conformal sensing module (7) and the circumferential groove (6).

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