Device for synchronously monitoring rotating speed of bearing inner ring and retainer and method for calculating slip rate
By installing triboelectric sensing units on the inner ring and cage of the bearing, and synchronously acquiring and processing signals, the problem of not being able to synchronously capture the rotational speeds of the inner ring and cage in the existing technology is solved, enabling accurate calculation of slippage rate and fault prediction.
Patent Information
- Application Number
- CN202511999331.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-29
- Publication Date
- 2026-02-24
AI Technical Summary
Existing technologies cannot simultaneously capture dynamic signals from both sides of the bearing inner ring and cage without any external known speed input. They cannot obtain the actual speed information of the bearing inner ring and cage under the same motion state in real time, which makes it impossible to quantitatively assess the degree of slippage.
A first electrode plate and a first dielectric ring are disposed on the cage and the inner ring of the bearing, and a second electrode plate and a second dielectric ring are disposed on the cage and the bearing housing. The relative motion and absolute motion signals between the cage and the inner ring of the bearing are collected by a triboelectric sensing unit, and the data acquisition and processing module performs synchronous processing to calculate the slippage rate.
It achieves dual-channel synchronous monitoring of the movement status of the bearing inner ring and cage, accurately calculates the slippage rate, provides direct data support for preventing serious failures, and improves the long-term working stability and reliability of the system.
Smart Images
Figure CN121558352A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of intelligent bearing technology, specifically to a device for synchronously monitoring the rotational speed of the bearing inner ring and cage, and a method for calculating the slippage rate. Background Technology
[0002] Rolling bearings are core components of modern high-end equipment power transmission systems, widely used in rail transit, precision machine tools, wind power equipment, and other fields. Under complex variable speed and high load conditions, abnormal relative sliding can easily occur between the internal components of the bearing, leading to a surge in local stress and abnormal temperature rise, which in turn can cause serious failures such as cage fracture and raceway wear, seriously threatening the safe and stable operation of the equipment. Therefore, realizing the relative motion state between the bearing inner ring and the cage to calculate the slippage rate is crucial for in-depth research on the slippage mechanism, optimization of bearing design, and implementation of predictive intelligent maintenance. However, existing single-channel triboelectric sensing structures can only sense the motion of a single rotating surface of the bearing inner ring or cage, and cannot simultaneously capture the dynamic signals of both sides of the bearing inner ring and cage without external known speed input. Therefore, they cannot obtain the actual speed information of the bearing inner ring and cage under the same motion state in real time, and cannot achieve quantitative assessment of the degree of slippage. Therefore, there is an urgent need to develop a new monitoring scheme to solve the key technical problem of being able to measure the rotational speeds of both the inner ring and the cage of the bearing to calculate the slippage rate. Summary of the Invention
[0003] The purpose of this invention is to provide a device for synchronously monitoring the rotational speed of the bearing inner ring and cage, and a method for calculating the slippage rate, so as to solve the problems existing in the prior art. This device can measure the rotational speed of both sides of the bearing inner ring and cage and calculate the slippage rate.
[0004] To achieve the above objectives, the present invention provides the following solution: This invention provides a synchronous monitoring device for the rotational speed of a bearing inner ring and cage, comprising a first electrode plate, a first dielectric ring, a second electrode plate, a second dielectric ring, and a data acquisition and processing module. The first electrode plate is disposed on the cage, and the first dielectric ring is disposed on the bearing inner ring. The first electrode plate, the first dielectric ring, and the bearing are coaxially arranged. During bearing operation, the first electrode plate and the first dielectric ring exhibit relative frictional motion to generate a first electrical signal on the first electrode plate characterizing the relative rotational speed between the cage and the bearing inner ring. The second electrode plate is disposed on the cage, and the second dielectric ring is disposed on the bearing housing. The second electrode plate and the second dielectric ring are positioned opposite each other. During bearing operation, the second electrode plate and the second dielectric ring exhibit relative frictional motion to generate a second electrical signal on the second electrode plate characterizing the actual rotational speed of the cage itself. The data acquisition and processing module is used to synchronously acquire the first electrical signal and the second electrical signal, process the first electrical signal to obtain relative rotational speed information between the cage and the bearing inner ring, and process the second electrical signal to obtain actual rotational speed information of the cage itself.
[0005] In some embodiments, the data acquisition and processing module includes a data acquisition module and a data processing module; the data acquisition module is disposed on the cage and electrically connected to the first electrode plate and the second electrode plate, and is used to synchronously acquire the first electrical signal and the second electrical signal, and convert them into a first digital signal and a second digital signal respectively, and then wirelessly transmit them to the data processing module; the data processing module is used to process the first digital signal to obtain the relative rotational speed information between the cage and the inner ring of the bearing; and is also used to process the second digital signal to obtain the actual rotational speed information of the cage itself.
[0006] In some embodiments, the first electrode plate is provided with a plurality of first interdigital electrodes, and the first dielectric ring is provided with a plurality of first protrusions; the number of the first interdigital electrodes corresponds one-to-one with the number of the first protrusions; the first interdigital electrodes and the first protrusions generate the first electrical signal through relative frictional movement.
[0007] In some embodiments, the second electrode plate is provided with a plurality of second interdigital electrodes, and the second dielectric ring is provided with a plurality of second protrusions; the number of the second interdigital electrodes corresponds one-to-one with the number of the second protrusions; the second interdigital electrodes and the second protrusions generate the second electrical signal through relative frictional movement.
[0008] In some implementations, the data acquisition module is a wireless dual-channel integrated triboelectric collection and transmission device, used to simultaneously acquire, convert, and transmit two electrical signals.
[0009] In some embodiments, the first electrode plate is fixed to the inner side of the retainer by a retaining ring and rotates synchronously with it; the first dielectric ring is fixedly sleeved on the outer surface of the inner ring of the bearing and rotates synchronously with it.
[0010] The present invention also provides a method for calculating slippage rate, comprising the following steps: S1: The bearing inner ring and cage speed synchronous monitoring device according to any one of claims 1 to 6 is used to collect the first electrical signal and the second electrical signal, process the first electrical signal to obtain the relative speed information of the cage and the bearing inner ring, and process the second electrical signal to obtain the actual speed information of the cage itself. S2: Based on the relative rotational speeds of the cage and the bearing inner ring, and the actual rotational speed of the cage, the actual rotational speed of the bearing inner ring is calculated. S3: Calculate the theoretical rotational speed of the cage based on the actual rotational speed of the inner ring of the bearing; S4: Calculate the slip rate of the cage based on the actual rotational speed and the theoretical rotational speed of the cage.
[0011] In some implementations, S1 includes: S11: The rolling bearing is fixed using a bearing housing; the first electrode plate is placed on the cage, the first dielectric ring is placed on the inner ring of the bearing, and the first electrode plate and the first dielectric ring are coaxially arranged; the second electrode plate is placed on the cage, the second dielectric ring is placed on the bearing housing, and the second electrode plate and the second dielectric ring are arranged opposite to each other; and the bearing is operated at a certain speed by using a motor to drive the rotating shaft. S12: The data acquisition and processing module simultaneously acquires the first electrical signal and the second electrical signal; S13: Process the first electrical signal to extract the relative rotational speed between the cage and the inner ring of the bearing; process the second electrical signal to extract the actual rotational speed of the cage.
[0012] In some implementations, step S13, the processing of the electrical signal includes: extracting the cage rotational speed and the relative rotational speed of the bearing inner ring and the cage by time-frequency filtering and inverse short-time Fourier transform.
[0013] In some implementations, in steps S3 and S4, the theoretical rotational speed of the cage is calculated according to the following formula: ; in To maintain the theoretical rotational speed of the cage, This represents the actual rotational speed of the bearing inner ring. The diameter of the ball bearing is... The bearing pitch circle diameter, This refers to the bearing contact angle.
[0014] The slippage rate is calculated according to the following formula: ; in To the actual rotational speed of the cage, This refers to the overall slippage rate of the bearing.
[0015] The present invention achieves the following technical effects compared to the prior art: This invention provides a device for synchronously monitoring the rotational speed of a bearing inner ring and cage, and a method for calculating the slippage rate. The device includes a first electrode plate, a first dielectric ring, a second electrode plate, a second dielectric ring, and a data acquisition and processing module. The first electrode plate is mounted on the cage, and the first dielectric ring is mounted on the bearing inner ring. During bearing operation, the two components exhibit relative frictional motion, thus forming an independent first triboelectric sensing unit. The second electrode plate is mounted on the cage, and the second dielectric ring is mounted on the bearing housing. During bearing operation, the two components exhibit relative frictional motion, thus forming an independent second triboelectric sensing unit. Through these two independent triboelectric sensing units, the relative motion signal of the cage relative to the inner ring and the absolute motion signal relative to the bearing housing are collected, respectively, thereby achieving dual-channel, synchronous, and direct online monitoring of the motion state of the bearing inner ring and cage. Simultaneously, it can accurately calculate the slippage rate, providing crucial direct data support for preventing serious failures. Attached Figure Description
[0016] To more clearly illustrate the technical solutions in the embodiments of the present 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 the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0017] Figure 1 This is a schematic diagram of the bearing structure and bearing of the bearing inner ring and cage speed synchronization monitoring device in some embodiments; Figure 2 A cross-sectional view of the bearing inner ring and cage speed synchronization monitoring device and the bearing in some embodiments; Figure 3 An exploded view of the bearing inner ring and cage speed synchronization monitoring device and the bearing in some embodiments; In the figure: 1-rotating shaft; 2-first dielectric ring; 3-bearing inner ring; 4-fixed ring; 5-first electrode plate; 6-cage; 7-second electrode plate; 8-second dielectric ring; 9-bearing housing; 10-wireless dual-channel integrated triboelectric collection and transmission device. Detailed Implementation
[0018] 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.
[0019] The purpose of this invention is to provide a device for synchronously monitoring the rotational speed of the bearing inner ring and cage, and a method for calculating the slippage rate, so as to solve the problems existing in the prior art. This device can measure the rotational speed of both sides of the bearing inner ring and cage and calculate the slippage rate.
[0020] 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.
[0021] Example 1 Combination Figures 1 to 3 This embodiment provides a synchronous monitoring device for the rotational speed of a bearing inner ring 3 and a cage 6, including a first electrode plate 5, a first dielectric ring 2, a second electrode plate 7, a second dielectric ring 8, and a data acquisition and processing module. The first electrode plate 5 is disposed on the cage 6, and the first dielectric ring 2 is disposed on the bearing inner ring 3. The first electrode plate 5, the first dielectric ring 2, and the bearing are coaxially arranged. When the bearing is working, the first electrode plate 5 and the first dielectric ring 2 have relative frictional motion to generate a first electrical signal on the first electrode plate 5 characterizing the relative rotational speed between the cage 6 and the bearing inner ring 3. The second electrode plate 7... The first electrical signal is mounted on the cage 6, the second dielectric ring 8 is mounted on the bearing housing 9, and the second electrode plate 7 is positioned opposite to the second dielectric ring 8. The second electrode plate 7 and the second dielectric ring 8 have relative frictional motion when the bearing is working, so as to generate a second electrical signal on the second electrode plate 7 that characterizes the actual rotational speed of the cage 6 itself. The data acquisition and processing module is used to synchronously acquire the first electrical signal and the second electrical signal, process the first electrical signal to obtain the relative rotational speed information between the cage 6 and the inner ring 3 of the bearing, and process the second electrical signal to obtain the actual rotational speed information of the cage 6 itself.
[0022] In this embodiment, the first electrode plate 5 is disposed on the cage 6, and the first dielectric ring 2 is disposed on the inner ring 3 of the bearing. When the bearing is working, the two have relative frictional motion, forming an independent first triboelectric sensing unit. The second electrode plate 7 is disposed on the cage 6, and the second dielectric ring 8 is disposed on the bearing housing 9. When the bearing is working, the two have relative frictional motion, forming an independent second triboelectric sensing unit. Through the two independent triboelectric sensing units, the relative motion signal of the cage 6 relative to the inner ring and the absolute motion signal relative to the bearing housing 9 are collected respectively, thereby realizing dual-channel, synchronous, and direct online monitoring of the motion state of the inner ring 3 and the cage 6. At the same time, it can accurately calculate the slippage rate of the cage 6, providing crucial direct data support for preventing serious failures.
[0023] In some examples, the data acquisition and processing module includes a data acquisition module and a data processing module; the data acquisition module is mounted on the cage 6 and electrically connected to the first electrode plate 5 and the second electrode plate 7, and is used to synchronously acquire the first electrical signal and the second electrical signal, and convert them into the first digital signal and the second digital signal respectively, and then wirelessly transmit them to the data processing module; the data processing module is used to process the first digital signal to obtain the relative rotational speed information between the cage 6 and the inner ring 3 of the bearing; and is also used to process the second digital signal to obtain the actual rotational speed information of the cage 6 itself.
[0024] In this embodiment, the data acquisition and processing module is divided into a data acquisition module placed on the cage 6 and an independent data processing module, and wireless transmission is adopted. By setting it on the cage 6, the synchronous acquisition and analog-to-digital conversion of two electrical signals are completed directly, avoiding the structural interference problem caused by drawing fragile analog signal lines from the high-speed rotating cage 6, which greatly improves the long-term working stability of the system. It also enhances the integration flexibility and maintainability of the system. The data processing module can be flexibly arranged outside the bearing housing 9 or on a remote terminal, which is convenient for installation, debugging and upgrading. The miniaturized and integrated design of the acquisition module minimizes the impact on the internal space and dynamic balance of the bearing.
[0025] It should be noted that the data acquisition module in this embodiment is lightweight and small in size, and its impact on the bearing movement is negligible.
[0026] In some examples, the first electrode plate 5 is provided with multiple first interdigital electrodes, and the first dielectric ring 2 is provided with multiple first protrusions; the number of first interdigital electrodes corresponds one-to-one with the number of first protrusions; the first interdigital electrodes and the first protrusions cause electrostatic induction through relative frictional movement, thereby generating a first electrical signal on the first interdigital electrodes.
[0027] In some examples, the second electrode plate 7 is provided with multiple second interdigital electrodes, and the second dielectric ring 8 is provided with multiple second protrusions; the number of second interdigital electrodes corresponds one-to-one with the number of second protrusions; the second interdigital electrodes and the second protrusions cause electrostatic induction through relative frictional movement, thereby generating a second electrical signal on the second interdigital electrodes.
[0028] In a preferred embodiment, the number of interdigital electrodes is the same as the number of protrusions on the first dielectric ring 2, which makes the output electrical signal have periodic characteristics. This greatly facilitates the subsequent data processing module to quickly and accurately calculate the pulse frequency, directly improving the sensitivity and accuracy of speed monitoring, and enabling weak movements to be reliably captured. In addition, it has stronger anti-interference capabilities in the complex electromagnetic and vibration noise environment inside the bearing, further ensuring the stability and reliability of monitoring data under harsh working conditions, and laying a solid signal foundation for accurate calculation of slippage rate.
[0029] It is understandable that both the first and second electrical signals are alternating current (AC) signals.
[0030] In some examples, the data acquisition module is a wireless dual-channel integrated triboelectric collection and transmission device 10, used to simultaneously acquire, convert, and transmit two electrical signals.
[0031] The data acquisition module in this embodiment is specifically a wireless dual-channel integrated triboelectric collection and transmission device 10. Its core lies in constructing a miniaturized and intelligent front-end processing unit closely attached to the signal source. The wireless dual-channel integrated triboelectric collection and transmission device 10 has dual preamplifiers, which can perform impedance matching and primary amplification on the weak high-impedance triboelectric signal at the first moment of signal generation. This significantly enhances the signal strength from the source and suppresses attenuation and noise introduction during transmission. The synchronous high-precision analog-to-digital converter chip follows closely behind, converting the two analog signals into digital signals in strict synchronization in the time domain. This not only perfectly preserves the strict phase and timing relationship between the two signals, but also gives the signal a strong anti-interference capability, completely avoiding the drawbacks of long-distance analog transmission. Finally, the integrated miniaturized wireless communication module reliably transmits the two digitized high-quality signals, completely eliminating the need to lead physical cables from the high-speed rotating cage 6, and eliminating the risk of failure caused by wire entanglement, wear, and poor contact. Overall, this highly integrated solution greatly improves the reliability, accuracy, and engineering practicality of the entire monitoring system, making it possible to acquire two key speed data sources synchronously and stably over a long period of time under complex operating conditions.
[0032] It should be noted that the wireless dual-channel integrated triboelectric collection and transmitting device 10 in this embodiment is prior art, and no improvement has been made to it in this example.
[0033] Understandably, the wireless dual-channel integrated triboelectric collecting and transmitting device 10 can be powered by the electrical signal generated by the friction between the first electrode plate 5 and the first dielectric ring 2, and can also be powered by the electrical signal generated by the friction between the second electrode plate 7 and the second dielectric ring 8. In some examples, the first electrode plate 5 is fixed to the inside of the retainer 6 by a retaining ring 4 and rotates synchronously with it; the first dielectric ring 2 is fixedly sleeved on the outer surface of the bearing inner ring 3 and rotates synchronously with it.
[0034] In this embodiment, the first electrode plate 5 is fixed to the inner side of the retainer 6 by the retainer 6 ring, and the first dielectric ring 2 is fixedly sleeved on the outer surface of the bearing inner ring 3, ensuring the rigid connection and absolute synchronous movement between the sensing unit and the measured component, thereby directly and without distortion capturing the most realistic relative rotation dynamics between the retainer 6 and the bearing inner ring 3; thus ensuring the continuous stability and reliability of the first electrical signal, laying a solid mechanical foundation for the subsequent accurate calculation of the relative rotation speed.
[0035] Example 2 The present invention also provides a method for calculating the slippage rate of the cage 6, comprising the following steps: S1: The bearing inner ring 3 and cage 6 speed synchronization monitoring device of Embodiment 1 is used to collect the first electrical signal and the second electrical signal, and the first electrical signal is processed to obtain the relative speed information of the cage 6 and the bearing inner ring 3, and the second electrical signal is processed to obtain the actual speed information of the cage 6. S2: Based on the relative rotational speeds of the cage 6 and the inner ring 3 of the bearing, and the actual rotational speed of the cage 6, the actual rotational speed of the inner ring 3 of the bearing is calculated. S3: Calculate the theoretical rotational speed of the cage 6 based on the actual rotational speed of the inner ring 3 of the bearing; S4: Calculate the slip rate of cage 6 based on the actual and theoretical rotational speeds of cage 6.
[0036] In some examples, step S1 includes: S11: The rolling bearing is fixed using the bearing housing 9; the first electrode plate 5 is placed on the cage 6, and the first dielectric ring 2 is placed on the inner ring 3 of the bearing, with the first electrode plate 5 and the first dielectric ring 2 coaxially arranged; the second electrode plate 7 is placed on the cage 6, and the second dielectric ring 8 is placed on the bearing housing 9, with the second electrode plate 7 and the second dielectric ring 8 facing each other; and the bearing is operated at a certain speed by using a motor to drive the rotating shaft 1. S12: The data acquisition and processing module simultaneously acquires the first electrical signal and the second electrical signal; S13: Process the first electrical signal to extract the relative rotational speed between the cage 6 and the inner ring 3 of the bearing; process the second electrical signal to extract the actual rotational speed of the cage 6.
[0037] In some examples, step S13 involves processing the electrical signal by extracting the rotational speed of the cage 6 and the relative rotational speeds of the bearing inner ring 3 and the cage 6 through time-frequency filtering and inverse short-time Fourier transform.
[0038] In some examples, in steps S3 and S4, the theoretical rotational speed of cage 6 is calculated according to the following formula: ; in To maintain the theoretical rotational speed of the frame 6, This represents the actual rotational speed of the inner ring 3 of the bearing. The diameter of the ball bearing is... The bearing pitch circle diameter, This refers to the bearing contact angle.
[0039] The slippage rate is calculated using the following formula: ; in To the actual rotational speed of the cage, This refers to the overall slippage rate of the bearing.
[0040] It should be noted that the structures, proportions, sizes, etc., depicted in the accompanying drawings of this specification are only used to complement the content disclosed in the specification, so as to enable those skilled in the art to understand and read them, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.
[0041] It should be noted that, for those skilled in the art, the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be regarded as exemplary and non-limiting in all respects, and the scope of the present invention is defined by the appended claims rather than the foregoing description. Therefore, it is intended that all changes falling within the meaning and scope of the equivalents of the claims be included within the present invention.
[0042] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.
Claims
1. A device for synchronously monitoring the rotational speed of a bearing inner ring and cage, characterized in that, include: A first electrode plate and a first dielectric ring; the first electrode plate is disposed on the cage, and the first dielectric ring is disposed on the inner ring of the bearing. The first electrode plate, the first dielectric ring and the bearing are coaxially disposed. When the bearing is working, the first electrode plate and the first dielectric ring have relative frictional motion to generate a first electrical signal on the first electrode plate that characterizes the relative rotational speed between the cage and the inner ring of the bearing. A second electrode plate and a second dielectric ring; the second electrode plate is disposed on the cage, the second dielectric ring is disposed on the bearing seat, the second electrode plate and the second dielectric ring are disposed opposite to each other, and the second electrode plate and the second dielectric ring have relative frictional movement when the bearing is working so as to generate a second electrical signal on the second electrode plate that characterizes the actual rotational speed of the cage itself. The data acquisition and processing module is used to synchronously acquire the first electrical signal and the second electrical signal, process the first electrical signal to obtain the relative rotational speed information between the cage and the inner ring of the bearing, and process the second electrical signal to obtain the actual rotational speed information of the cage itself.
2. The bearing inner ring and cage speed synchronous monitoring device according to claim 1, characterized in that, The data acquisition and processing module includes a data acquisition module and a data processing module. The data acquisition module is disposed on the cage and electrically connected to the first electrode plate and the second electrode plate. It is used to synchronously acquire the first electrical signal and the second electrical signal, and convert them into a first digital signal and a second digital signal, respectively, and then wirelessly transmit them to the data processing module. The data processing module is used to process the first digital signal to obtain the relative rotational speed information between the cage and the inner ring of the bearing. It is also used to process the second digital signal to obtain the actual rotational speed information of the cage itself.
3. The bearing inner ring and cage speed synchronous monitoring device according to claim 1, characterized in that, The first electrode plate is provided with a plurality of first interdigital electrodes, and the first dielectric ring is provided with a plurality of first protrusions; the number of the first interdigital electrodes corresponds one-to-one with the number of the first protrusions; the first interdigital electrodes and the first protrusions generate the first electrical signal through electrostatic induction by relative frictional movement.
4. The bearing inner ring and cage speed synchronous monitoring device according to claim 1, characterized in that, The second electrode plate is provided with a plurality of second interdigital electrodes, and the second dielectric ring is provided with a plurality of second protrusions; the number of the second interdigital electrodes corresponds one-to-one with the number of the second protrusions; the second interdigital electrodes and the second protrusions generate the second electrical signal through electrostatic induction by relative frictional movement.
5. The bearing inner ring and cage speed synchronous monitoring device according to claim 2, characterized in that, The data acquisition module is a wireless dual-channel integrated triboelectric collection and transmission device, used to simultaneously acquire, convert, and transmit two electrical signals.
6. The bearing inner ring and cage speed synchronous monitoring device according to claim 3, characterized in that, The first electrode plate is fixed to the inner side of the retainer by a fixing ring and rotates synchronously with it; the first dielectric ring is fixedly sleeved on the outer surface of the inner ring of the bearing and rotates synchronously with it.
7. A method for calculating slippage rate, characterized in that, Includes the following steps: S1: The bearing inner ring and cage speed synchronous monitoring device according to any one of claims 1 to 6 is used to collect the first electrical signal and the second electrical signal, process the first electrical signal to obtain the relative speed information of the cage and the bearing inner ring, and process the second electrical signal to obtain the actual speed information of the cage itself. S2: Based on the relative rotational speeds of the cage and the bearing inner ring, and the actual rotational speed of the cage, the actual rotational speed of the bearing inner ring is calculated. S3: Calculate the theoretical rotational speed of the cage based on the actual rotational speed of the inner ring of the bearing; S4: Calculate the slip rate of the cage based on the actual rotational speed and the theoretical rotational speed of the cage.
8. The method according to claim 7, characterized in that, Step S1 includes: S11: The rolling bearing is fixed using a bearing housing; the first electrode plate is placed on the cage, the first dielectric ring is placed on the inner ring of the bearing, and the first electrode plate and the first dielectric ring are coaxially arranged; the second electrode plate is placed on the cage, the second dielectric ring is placed on the bearing housing, and the second electrode plate and the second dielectric ring are arranged opposite to each other; and the bearing is operated at a certain speed by using a motor to drive the rotating shaft. S12: The data acquisition and processing module simultaneously acquires the first electrical signal and the second electrical signal; S13: Process the first electrical signal to extract the relative rotational speed between the cage and the inner ring of the bearing; process the second electrical signal to extract the actual rotational speed of the cage.
9. The method according to claim 8, characterized in that, In step S13, the processing of the electrical signal includes: extracting the cage rotation speed and the relative rotation speed between the bearing inner ring and the cage through time-frequency filtering and inverse short-time Fourier transform.
10. The method according to claim 7, characterized in that, In steps S3 and S4, the theoretical rotational speed of the cage is calculated according to the following formula: ； in To maintain the theoretical rotational speed of the cage, This represents the actual rotational speed of the bearing inner ring. The diameter of the ball bearing is... The bearing pitch circle diameter, This refers to the bearing contact angle. The slippage rate is calculated according to the following formula: ； in To the actual rotational speed of the cage, This refers to the overall slippage rate of the bearing.