Roller bearing rolling body motion state monitoring device and method and storage medium

Abstract

The invention discloses a roller bearing rolling body motion state monitoring device and method and a storage medium, and relates to the technical field of intelligent bearings, the roller bearing rolling body motion state monitoring device comprises an interdigital electrode plate, a dielectric plate and a data acquisition and processing module; the interdigital electrode plate is arranged on the retainer, the dielectric plate is arranged on the rolling body, and an alternating current signal for representing the rotating speed of the rolling body is generated through relative movement of the interdigital electrode plate and the dielectric plate, so that real-time and online monitoring of the rotating speed of the rolling body is realized; a non-contact electrical sensing principle is adopted, abrasion and interference caused by a contact type sensor are avoided, meanwhile, shielding by a lubricating oil medium in the bearing is completely avoided, the whole sensing structure is simple and easy to integrate, and a dynamic data source is provided for bearing state evaluation.

Description

Technical Field

[0001] This invention relates to the field of intelligent bearing technology, specifically to a device, method, and storage medium for monitoring the motion state of rolling elements in a roller bearing. Background Technology

[0002] As mechanical equipment develops towards higher speeds, greater intelligence, and higher reliability, rolling bearings, as core supporting components of various power transmission systems, play a crucial role in force transmission and motion guidance in high-end equipment fields such as rail transit, precision machine tools, and wind power equipment. The stability of their operating state directly determines the energy efficiency and operational safety of the entire equipment. During the operation of rolling bearings, the kinematic behavior of the rolling elements often reflects the bearing's load and abnormal conditions. Defects, foreign objects, or other abnormalities within the raceway can lead to abnormal behavior of the rolling elements, resulting in severe failures such as localized stress concentration, rolling element damage, bearing material fatigue, and cage damage, posing a serious threat to the reliable operation of the equipment. Therefore, real-time acquisition of the rolling element's rotational speed is of great significance for in-depth research into the dynamic characteristics of rolling bearings, optimization of structural design, and the realization of intelligent condition monitoring.

[0003] Current monitoring methods for bearing rolling elements still have many limitations: contact monitoring methods often involve fixing strain gauges to a cage and monitoring the abnormal condition of the rolling elements by observing the deformation of the strain gauges, but they cannot monitor the rotational speed of the rolling elements; non-contact optical methods are often complex in structure and are obstructed by space and lubrication media, making it difficult to directly and accurately measure the rotational speed of the rolling elements; therefore, given the complex motion characteristics of bearing rolling elements, there is an urgent need to develop a bearing rolling element motion state monitoring device with a simple structure that can monitor the motion state in real time. Summary of the Invention

[0004] The purpose of this invention is to provide a device, method, and storage medium for monitoring the motion state of rolling elements in roller bearings, in order to solve the problems existing in the prior art. The invention has a simple structure and can monitor the motion state of rolling elements in bearings in real time.

[0005] To achieve the above objectives, the present invention provides the following solution: This invention provides a rolling element motion state monitoring device for a roller bearing, comprising an interdigitated electrode plate, a dielectric plate, and a data acquisition and processing module. The interdigitated electrode plate is disposed on the cage, and the dielectric plate is disposed on the rolling element. The interdigitated electrode plate, the dielectric plate, and the rolling element are coaxially arranged. The interdigitated electrode plate and the dielectric plate have relative motion during bearing operation to generate an alternating current signal on the interdigitated electrode plate that characterizes the rotational speed of the rolling element. The data acquisition and processing module is used to acquire the alternating current signal and process the alternating current signal to obtain the rotational speed information of the rolling element.

[0006] 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 interdigital electrode plate, and is used to acquire the AC signal, convert the AC signal into a digital signal, and wirelessly transmit it to the data processing module; the data processing module is used to process the digital signal to obtain the rotational speed information of the rolling element.

[0007] In some embodiments, both the interdigitated electrodes and the plate dielectric are radially arranged.

[0008] In some embodiments, the data acquisition module is a wireless dual-channel integrated triboelectric collection and transmitting device.

[0009] In some embodiments, the alternating current signal generated by the relative motion between the interdigital electrode plates and the dielectric plate also powers the wireless dual-channel integrated triboelectric collection and transmitting device.

[0010] In some embodiments, the interdigitated electrode plates are mounted on the retainer via a support frame made of insulating material, and a gap is maintained between them and the dielectric plate.

[0011] In some embodiments, the support frame includes a support plate and two fixed legs; one end of each fixed leg is fixedly connected to the support plate, and the other end is fixedly connected to the cage; the two fixed legs are symmetrically arranged and together with the support plate and the cage form a receiving space, the rolling element is located in the receiving space and maintains a gap with the surrounding components; the interdigitated electrode plate is disposed on the support plate, and the dielectric plate is disposed on the rolling element.

[0012] The present invention also provides a method for calculating the rotational speed of a rolling element, using the monitoring device described in any of the above claims, including acquiring an alternating current signal generated by the rotation of the rolling element in the interdigitated electrode plate; and calculating the rotational speed of the rolling element based on the time-domain waveform of the alternating current signal.

[0013] In some embodiments, the rotational speed of the rolling element is calculated according to the following formula: ; In the formula, f s Let Δ be the time-domain waveform period of the alternating current signal. t The time required for one cycle of the time-domain waveform of an alternating current signal; ; In the formula, n r This indicates the rotational speed of the rolling elements of the bearing. N e This indicates the number of comb teeth on the interdigital electrode plate.

[0014] The present invention also provides a storage medium storing a program for executing the method for calculating the rotational speed of a rolling element as described in any of the preceding claims on a computer.

[0015] The present invention achieves the following technical effects compared to the prior art: This invention provides a rolling element motion state monitoring device for roller bearings, comprising an interdigitated electrode plate, a dielectric plate, and a data acquisition and processing module. The interdigitated electrode plate is disposed on the cage, and the dielectric plate is disposed on the rolling element. Through the relative movement of the interdigitated electrode plate and the dielectric plate, an AC signal is generated to characterize the rotational speed of the rolling element, thereby realizing real-time, online monitoring of the rotational speed of the rolling element. It adopts a non-contact electrical sensing principle, avoiding the wear and interference caused by contact sensors, and is completely unaffected by the internal lubricating oil medium of the bearing. The entire sensing structure is simple and easy to integrate, providing a dynamic data source for bearing condition assessment. 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 structure of the roller bearing rolling element motion state monitoring device, bearing, and bearing support in some embodiments. Figure 2 This is a schematic diagram of the structure of the roller bearing rolling element motion state monitoring device and the bearing in some embodiments; Figure 3 Exploded view of the specific structure of the interdigitated electrode plate and dielectric plate; In the diagram: 1-locking nut; 2-support frame; 3-bearing seat; 4-rotating shaft; 5-bearing body; 6-wireless dual-channel integrated triboelectric collection and transmitting device; 7-end cap; 8-screw; 9-dielectric plate; 10-interdigital electrode plate; 11-support plate; 12-fixed support foot; 13-rolling element. 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, method, and storage medium for monitoring the motion state of rolling elements in roller bearings, in order to solve the problems existing in the prior art. The invention has a simple structure and can monitor the motion state of rolling elements in bearings in real time.

[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 device for monitoring the motion state of a rolling element 13 in a roller bearing, including an interdigitated electrode plate 10, a dielectric plate 9, and a data acquisition and processing module. The interdigitated electrode plate 10 is disposed on a cage, and the dielectric plate 9 is disposed on the rolling element 13. The interdigitated electrode plate 10, the dielectric plate 9, and the rolling element 13 are coaxially arranged. The interdigitated electrode plate 10 and the dielectric plate 9 have relative motion when the bearing is working to generate an alternating current signal on the interdigitated electrode plate 10 that characterizes the rotational speed of the rolling element 13. The data acquisition and processing module is used to acquire the alternating current signal and process the alternating current signal to obtain the rotational speed information of the rolling element 13.

[0022] In this embodiment, by placing the interdigital electrode plate 10 on the cage and the dielectric plate 9 on the rolling element 13, an AC signal is generated to characterize the rotational speed of the rolling element 13 through the relative movement of the interdigital electrode plate 10 and the dielectric plate 9, thereby realizing real-time online monitoring of the rotational speed of the rolling element 13. The non-contact electrical sensing principle is adopted, avoiding the wear and interference caused by contact sensors, and is completely unaffected by the lubricating oil medium inside the bearing. The entire sensing structure is simple and easy to integrate, providing a dynamic and reliable data source for bearing condition assessment.

[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 and electrically connected to the interdigital electrode plate 10, and is used to acquire AC signals and convert the AC signals into digital signals for wireless transmission to the data processing module; the data processing module is used to process the digital signals to obtain the rotational speed information of the rolling element 13.

[0024] In this embodiment, the data acquisition and processing module is divided into a data acquisition module placed on the cage and an independent data processing module, and wireless transmission is adopted. By setting it on the cage, the acquisition and analog-to-digital conversion of AC signals are completed directly, avoiding the structural interference problem caused by drawing fragile analog signal lines from the high-speed rotating cage, which greatly improves the long-term working stability of the system. The system's integration flexibility and maintainability are enhanced. The data processing module can be flexibly arranged outside the bearing housing 3 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 interdigitated electrode plate 10 and the dielectric plate 9 are both radially arranged.

[0027] This embodiment provides a specific shape for the interdigitated electrodes and dielectric plate 9. The radial structure has a smaller area and is relatively lighter than the traditional circular structure. When the dielectric plate 9 is placed on the rolling element 13, it can further reduce the impact on the bearing operation, thereby generating a more regular AC signal and ensuring the reliability of the monitoring data.

[0028] In some examples, the data acquisition module is a wireless dual-channel integrated triboelectric collection transmitter 6.

[0029] The data acquisition module in this embodiment is specifically a wireless dual-channel integrated triboelectric collection and transmission device 6, which includes a power management module, an analog-to-digital converter module, a dual-channel preamplifier, and a main control module. Its core is the construction of a miniaturized and intelligent front-end processing unit closely attached to the signal source. The wireless dual-channel integrated triboelectric collection and transmission device 6 has dual preamplifiers, which can perform impedance matching and primary amplification on weak high-impedance AC signals 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 analog signal into a digital signal in strict synchronization in the time domain. This gives the signal strong anti-interference capability and completely avoids the drawbacks of long-distance analog transmission. Finally, the integrated miniaturized wireless communication module reliably transmits these two digitized high-quality signals, completely eliminating the need to lead physical cables from the high-speed rotating cage 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.

[0030] It should be noted that the wireless dual-channel integrated triboelectric collection and transmitting device 6 in this embodiment is existing technology, and no improvement has been made to it in this embodiment.

[0031] In some examples, the alternating current signal generated by the relative motion between the interdigital electrode plate 10 and the dielectric plate 9 also powers the wireless dual-channel integrated triboelectric collector transmitter 6.

[0032] In this embodiment, the triboelectric energy generated by the relative motion between the interdigital electrodes and the dielectric plate 9 during the monitoring process is directly used to power the integrated triboelectric collection and emission device. This makes the monitoring device a self-sufficient independent system that does not require an external power source or battery. It fundamentally solves the problem of reliable power supply inside a high-speed rotating, sealed bearing. This not only eliminates the safety and interference problems caused by wiring, but also ensures that as long as the bearing is running, monitoring and data transmission can continue autonomously, greatly improving the reliability and applicability of the system.

[0033] In some examples, the interdigital electrode plate 10 is mounted on a retainer via an insulating support frame 2 and maintains a gap with the dielectric plate 9.

[0034] In this embodiment, the interdigital electrode plate 10 is fixedly mounted on the retainer by a support frame 2 made of insulating material. The support frame 2 ensures that the interdigital electrode plate 10 and the dielectric plate 9 always maintain a predetermined non-contact gap, which fundamentally avoids wear between moving parts and ensures the stability and reliability of long-term operation.

[0035] In some examples, the support frame 2 includes a support plate 11 and two fixed legs 12; one end of the fixed leg 12 is fixedly connected to the support plate 11, and the other end is fixedly connected to the cage; the two fixed legs 12 are symmetrically arranged and together with the support plate 11 and the cage form an accommodating space, the rolling element 13 is located in the accommodating space and maintains a gap with the surrounding components; the interdigitated electrode plate 10 is disposed on the support plate 11, and the dielectric plate 9 is disposed on the rolling element 13.

[0036] This embodiment provides a specific configuration of the support frame 2. The insulating rigid frame formed by the support plate 11 and two symmetrical fixed legs 12 establishes a stable and protected independent working environment for the sensing unit. The interdigitated electrode plate 10 is precisely suspended and a constant gap is maintained between it and the rolling element 13, ensuring the long-term stability of the measurement reference. At the same time, the enclosed space effectively shields external impurities from directly intruding into the sensing area, significantly improving the signal reliability in oily environments.

[0037] In some examples, a more specific setup is also provided: the fixed legs 12 of the support frame 2 are mounted on the bearing cage using nuts; the interdigital electrode plate 10 is attached to the support plate 11 with strong adhesive; the dielectric plate 9 is attached to the side of the rolling element 13 with strong adhesive; the wireless dual-channel integrated triboelectric collector and transmitter 6 is attached to the support frame 2 with strong adhesive; and the interdigital electrode plate 10 and the wireless dual-channel integrated triboelectric collector and transmitter 6 are connected by wires. The bearing body 5 is fixed in the bearing seat 3 by locking nuts 1, rotating shaft 4, end cap 7, and screws 8. The rotating shaft 4 is driven by an external motor. The relative movement of the interdigital electrode plate 10 and the dielectric plate 9 generates an AC signal. The wireless dual-channel integrated triboelectric collector and transmitter 6 amplifies and converts the AC signal and transmits it to the mobile receiving terminal host computer, thereby realizing real-time monitoring of the rotational speed of the rolling element 13.

[0038] Example 2 This embodiment also provides a method for calculating the rotational speed of the rolling element 13, using the monitoring device in Embodiment 1, including acquiring the alternating current signal generated by the rotation of the rolling element 13 in the interdigitated electrode plate 10; and calculating the rotational speed of the rolling element 13 based on the time-domain waveform of the alternating current signal.

[0039] In some examples, the rotational speed of the rolling element 13 is calculated according to the following formula: ; In the formula, f s Let Δ be the time-domain waveform period of the alternating current signal. t The time required for one cycle of the time-domain waveform of an alternating current signal; ; In the formula, n r This indicates the rotational speed of the rolling elements of the bearing. N e This indicates the number of comb teeth on the interdigital electrode plate.

[0040] This embodiment provides a process for calculating the rotational speed of the rolling elements of a bearing using the apparatus in Embodiment 1, including the following steps: 1. The bearing body 5 is fixed by the bearing housing 3, and the bearing is driven by the motor to rotate the shaft 4 to run at a speed of 500 rpm, thereby obtaining the AC signal of the motion state of the rolling element 13. 2. An AC signal is generated by a triboelectric inductor module consisting of two pairs of interdigital electrode plates 10 and dielectric plate 9, and transmitted to a wireless dual-channel integrated triboelectric collection and transmission device 6 via a wire. 3. The main control chip in the wireless dual-channel integrated triboelectric collection and transmission device 6 collects and processes all signals and sends them to the host computer at the receiving end, completing the entire wireless transmission process. 4. Based on the information from the receiving end, the dual-channel AC signal is post-processed to obtain the real-time AC signals of the two pairs of interdigital electrode plates 10 and dielectric plates 9 during the bearing operation. 5. Analyze the AC signal over a period of time. Obtain the real-time rotational speed of the rolling element 13 by calculating the periodic changes in the waveform of the AC signal, providing data support for the analysis of the bearing operation.

[0041] Example 3 This embodiment also provides a storage medium storing a program that executes the method for calculating the rotational speed of the rolling element in Embodiment 2 on a computer; this embodiment possesses all the advantages of Embodiment 2, which will not be repeated here.

[0042] In the description of this invention, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0043] 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.

[0044] 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.

[0045] 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 monitoring the motion state of rolling elements in a roller bearing, characterized in that, include: Interdigitated electrode plates and dielectric plates; the interdigitated electrode plates are disposed on the cage, the dielectric plates are disposed on the rolling element, the interdigitated electrode plates, the dielectric plates and the rolling element are coaxially disposed, and the interdigitated electrode plates and the dielectric plates have relative motion when the bearing is working to generate an AC signal on the interdigitated electrode plates characterizing the rotational speed of the rolling element; The data acquisition and processing module is used to acquire the AC signal and process the AC signal to obtain the rotational speed information of the rolling element.

2. The roller bearing rolling element motion state 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 interdigital electrode plate, and is used to acquire the AC signal, convert the AC signal into a digital signal, and wirelessly transmit it to the data processing module; the data processing module is used to process the digital signal to obtain the rotational speed information of the rolling element.

3. The roller bearing rolling element motion state monitoring device according to claim 1, characterized in that, Both the interdigitated electrode plate and the dielectric plate are radially arranged.

4. The roller bearing rolling element motion state monitoring device according to claim 2, characterized in that, The data acquisition module is a wireless dual-channel integrated triboelectric collection and transmission device.

5. The roller bearing rolling element motion state monitoring device according to claim 4, characterized in that, The alternating current signal generated by the relative motion between the interdigital electrode plate and the dielectric plate also powers the wireless dual-channel integrated triboelectric collection and transmission device.

6. The roller bearing rolling element motion state monitoring device according to claim 1, characterized in that, The interdigitated electrode plate is mounted on the retainer via a support frame made of insulating material, and a gap is maintained between it and the dielectric plate.

7. The roller bearing rolling element motion state monitoring device according to claim 6, characterized in that, The support frame includes a support plate and two fixed legs; one end of each fixed leg is fixedly connected to the support plate, and the other end is fixedly connected to the cage; the two fixed legs are symmetrically arranged and together with the support plate and the cage form a receiving space, the rolling element is located in the receiving space and maintains a gap with the surrounding components; the interdigitated electrode plate is disposed on the support plate, and the dielectric plate is disposed on the rolling element.

8. A method for calculating the rotational speed of a rolling element, characterized in that, The monitoring device as described in any one of claims 1 to 7 includes acquiring an alternating current signal generated by the rotation of the rolling element in the interdigitated electrode plate; and calculating the rotational speed of the rolling element based on the time-domain waveform of the alternating current signal.

9. The method according to claim 8, characterized in that, The rotational speed of the rolling element is calculated according to the following formula: ； In the formula, f s Let Δ be the time-domain waveform period of the alternating current signal. t The time required for one cycle of the time-domain waveform of an alternating current signal; ； In the formula, n r This indicates the rotational speed of the rolling elements of the bearing. N e This indicates the number of comb teeth on the interdigital electrode plate.

10. A storage medium, characterized in that, It stores a program for executing on a computer the method for calculating the rotational speed of the rolling element as described in any one of claims 8 to 9.

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