阅读说明：本技术 一种轴承保持架转速测量系统 (Bearing retainer rotational speed measurement system ) 是由 聂泳忠 汤银海 高炳攀 李博 骞少阳 于 2020-05-27 设计创作，主要内容包括：本发明公开了一种轴承保持架转速测量系统,包括传感器模块,包括固定在保持架端面的磁性薄膜和用于接收磁性信号的磁阻传感器；采集模块,用于采集磁阻传感器接收的磁性信息并传输给信号处理模块；处理模块,用于对所述磁性信号进行时频分析以计算磁性数据信号的幅值和频率,获得磁性数据信号的频域波形图,并经过波形解析计算得到保持架的转速,本发明在不破坏保持架构造的前提下精确测量转速,运行平稳不丢波,并具有对油雾、振动、环境气流等不敏感的优点,测量系统还设置校验传感器,对失速和丢波现象进行校验。(The invention discloses a bearing retainer rotating speed measuring system, which comprises a sensor module, a sensor module and a sensor module, wherein the sensor module comprises a magnetic film fixed on the end surface of a retainer and a magnetic resistance sensor used for receiving a magnetic signal; the acquisition module is used for acquiring the magnetic information received by the magnetic resistance sensor and transmitting the magnetic information to the signal processing module; the measuring system comprises a magnetic signal processing module, a processing module and a measuring system, wherein the magnetic signal processing module is used for carrying out time-frequency analysis on the magnetic signal to calculate the amplitude and the frequency of the magnetic data signal, obtaining a frequency domain waveform diagram of the magnetic data signal, and obtaining the rotating speed of the retainer through waveform analysis calculation.)

1. A bearing cage rotational speed measurement system, comprising:

the sensor module comprises a magnetic film (2) fixed on the end face of the holder (1) and a magnetic resistance sensor (3) for receiving a magnetic signal;

the acquisition module is used for acquiring the magnetic information received by the magnetoresistive sensor (3) and transmitting the magnetic information to the signal processing module;

and the processing module is used for carrying out time-frequency analysis on the magnetic signals to calculate the amplitude and the frequency of the magnetic data signals, obtaining a frequency domain oscillogram of the magnetic data signals, and obtaining the rotating speed of the retainer (1) through waveform analysis and calculation.

2. A measuring system according to claim 1, characterized in that the magneto resistive sensor (3) is a TMR tunnel magneto resistive sensor.

3. The measurement system of claim 1, wherein the processing module comprises:

a storage submodule for storing magnetic signal data;

the analysis submodule is used for carrying out time-frequency analysis on the magnetic signal data to obtain the amplitude and the frequency of the signal and obtaining the rotating speed information of the retainer (1) through fast Fourier transform;

a diagnostic submodule for comparing the rotational speed of the bearing cage (1) with a predetermined parameter value to determine whether a fault exists.

4. The measuring system according to claim 1, characterized in that the magnetic film (2) is a magnetic layer with micron-sized thickness fixed on the end face of the holder (1), and the magnetic layer has magnetically encoded information of N-pole and S-pole arrangement.

5. A measuring system according to claim 4, characterized in that the magnetic film (2) is made of a nanomaterial using one or more of silver-coated neodymium-iron-boron, silver-coated samarium-cobalt-magnet, polydimethylsiloxane-coated neodymium-iron-boron-magnet or polydimethylsiloxane-coated samarium-cobalt-magnet.

6. A measuring system according to claim 1, characterized in that the thickness of the magnetic thin film (2) is less than 100 μ ι η.

7. The measuring system according to claim 1, characterized in that the magnetic film (2) is fixed on the end face of the holder (1) by one or more of sintering, spin coating or screen printing; the magnetic film (2) has one or more magnetic poles.

8. A measuring system according to claim 1, characterized in that the probes of the magnetoresistive sensors (3) are mounted vertically above the end face of the cage (1).

9. A measuring system according to any of claims 1-8, further comprising an eddy current sensor (5) for verification, the eddy current sensor (5) being mounted on a protective cover (10), and the eddy current sensor (5) being perpendicular to the shaft (7) and being spaced apart.

10. A measuring system according to claim 3, characterized in that said predetermined parameter value is a threshold value set with reference to the rotational speed detected by the eddy current sensor (5).

Technical Field

The invention relates to the technical field of bearing running state detection, in particular to a bearing retainer rotating speed measuring system.

Background

It is well known that bearings are the core components of machinery, responsible for force and torque transmission, and the main factors of equipment safety, high efficiency, precision and stable operation. Therefore, the method has the advantages that the rotating speed of the aviation main shaft retainer is measured, the influence of the slippage on the stable operation of the rolling bearing is explored, important data are provided for the design optimization of the bearing, and the method has important significance on the normal operation of an aero-engine and the continuous healthy development of the whole aviation industry.

The bearing applied in the aerospace field has higher general rotating speed, more rigorous working environment and higher performance requirement on the bearing, the retainer is used as a very key part of the bearing, the dynamic performance and reliability of the retainer can influence the working performance of the whole bearing, in recent years, the rotating speed of the retainer is measured by an ultrasonic measurement retainer rotating speed method, for example, Chinese patent publication No. CN108957023A discloses a system and a method for measuring the rotating speed of the bearing retainer based on ultrasonic, the rotating speed of the retainer is measured in real time by using the ultrasonic, and an ultrasonic probe is fixed on an outer ring of the bearing; also, for example, chinese patent publication No. CN108196259A discloses a method for measuring the instantaneous speed of a rolling bearing, in which two ultrasonic sensor probes are arranged side by side in the circumferential direction of the outer ring of the rolling bearing, and the instantaneous speed of the rolling bearing retainer is calculated according to the reflectivity of signals emitted from the two ultrasonic sensor probes.

In the two inventions, the ultrasonic sensor probe is used for measuring the rotating speed of the retainer, but the ultrasonic sensor probe is easily influenced by external vibration, airflow, noise and the like, the measurement precision is reduced, and the measurement in a high-temperature oil mist environment cannot be realized.

Disclosure of Invention

The invention aims to solve the problems that in the prior art, a part is additionally arranged for measuring the rotating speed of the retainer, the measurement precision is low, the manufacturing cost is high, the volume is large, and the high-temperature oil mist environment condition is not suitable.

Firstly, the TMR tunnel magnetoresistive sensor adopted by the invention has the characteristics of insensitivity to oil mist, vibration, environmental airflow and the like, high test precision, small error, small noise, no wave loss and the like, and can be widely applied to the rotating speed measurement of various rolling bearings and rotating parts, including the fields of aeroengines, gas turbines, airplanes, ships, wind power, rail transit and the like; secondly, the nano magnetic film is arranged on the end face of the retainer, so that the nano magnetic film is thin, simple in preparation and convenient and fast to operate, does not damage the structure, does not need to be additionally provided with redundant accessories, and solves the difficulty of research in the field; finally, the eddy current sensor rotating speed is set to be a preset parameter value for verification and fault judgment, and stall wave loss and phenomena are effectively monitored.

A bearing cage rotational speed measurement system, comprising: the sensor module comprises a magnetic film fixed on the end face of the retainer and a magnetoresistive sensor for receiving a magnetic signal; the acquisition module is used for acquiring the magnetic information received by the magnetic resistance sensor and transmitting the magnetic information to the signal processing module; and the processing module is used for carrying out time-frequency analysis on the magnetic signals to calculate the amplitude and the frequency of the magnetic data signals, obtaining a frequency domain oscillogram of the magnetic data signals, and obtaining the rotating speed of the retainer through waveform analysis and calculation.

Further, the magnetoresistive sensor is a TMR tunnel magnetoresistive sensor.

Further, the processing module comprises: a storage submodule for storing magnetic signal data;

the analysis submodule is used for carrying out time-frequency analysis on the magnetic signal data to obtain the amplitude and the frequency of the signal and obtaining the rotating speed information of the retainer through fast Fourier transform;

the diagnosis submodule is used for comparing the rotating speed of the bearing retainer with a preset parameter value so as to judge whether a fault exists;

the diagnosis submodule is used for comparing the rotating speed of the bearing retainer with a preset parameter value so as to judge whether a fault exists;

furthermore, the acquisition module comprises an acquisition device, and acquires the magnetic data received by the TMR tunnel magnetoresistive sensor through the board card; the transmission submodule is used for sending the magnetic information data to the signal processing display module; the power supply sub-module is a module power supply.

Furthermore, the magnetic film is a magnetic layer with micron-sized thickness fixed on the end face of the retainer, and the magnetic layer is provided with magnetic coding information arranged by an N pole and an S pole.

Furthermore, the magnetic coding information arrangement method is that N poles and S poles are alternately arranged or magnetic poles are arranged in the same direction.

Further, the magnetic film is made of a nano material, and the nano material is made of one or more of silver-coated neodymium iron boron, silver-coated samarium cobalt magnet, polydimethylsiloxane-coated neodymium iron boron magnet or polydimethylsiloxane-coated samarium cobalt magnet.

Further, the thickness of the magnetic thin film is less than 100 μm.

Furthermore, the residual magnetic quantity can be controlled by controlling the thickness of the magnetic film.

Further, the magnetic film is fixed on the end face of the retainer in one or more modes of sintering, spin coating or screen printing; the magnetic film has one or more magnetic poles.

Further, the probe of the TMR magnetoresistive sensor is vertically arranged above the end face of the retainer.

Furthermore, the TMR magnetoresistive sensor probe and the magnetic thin film on the end face of the retainer keep a distance of 1-5 mm.

Further, the measuring system also comprises an eddy current sensor for verification, and the eddy current sensor is arranged on the protective cover, is perpendicular to the shaft and keeps a distance within 1 mm.

Furthermore, a small notch is cut on the bearing rotating shaft and is used for being matched with the eddy current sensor to measure the rotating speed of the rotating shaft.

Further, the predetermined parameter value is a threshold value set with reference to the rotational speed of the eddy current sensor.

Further, when the rotating speed of the TMR tunnel magnetoresistive sensor exceeds a threshold value, the diagnosis submodule judges to send a stall fault prompt.

Furthermore, the fault submodule compares waveforms acquired by the TMR tunnel magnetoresistive sensor and the eddy current sensor, wave loss occurs when the TMR tunnel magnetoresistive sensor is discontinuous in waveform, irregular and uneven in interval, and the diagnosis submodule judges and sends a wave loss fault prompt.

Further, the fault prompt alarm comprises a display alarm and an audio alarm.

The technical scheme of the invention has the beneficial effects that:

(1) the rotating speed of the retainer is measured in a non-contact manner, so that the influence on the measurement result is reduced, and the data is accurate;

(2) the nano magnetic film is arranged on the retainer, so that the thickness is light and thin, the residual magnetic quantity is controllable, the structure of the retainer is not damaged, and the potential safety hazard is avoided;

(3) the magnetic film is selected for preparation, the operation is simple, the price is low, and the method is suitable for industrial popularization and application and transformation of the existing bearing;

(4) the TMR magnetoresistive tunnel sensor has the characteristics of low energy consumption, long service life and insensitivity to environment;

(5) the eddy current sensor is adopted to verify the magnetic resistance sensor, so that stall and wave loss can be verified and an alarm prompt is sent.

Drawings

FIG. 1 is a schematic view of a measurement system according to the present invention;

FIG. 2 is a schematic view of a cut-away side of the cage of the present invention;

FIG. 3 is a schematic illustration of the TMR magnetoresistive tunnel sensor and eddy current sensor locations of the present invention;

FIG. 4 is a graph comparing the TMR tunnel magnetoresistive sensor and the eddy current sensor of the present invention for measuring the bearing and motor speed;

FIG. 5 is a line graph of deviation of TMR tunnel magnetoresistive sensor and eddy current sensor in the present invention;

FIG. 6 is a comparison of waveforms of data collected by two sensors at a sampling frequency of 10 kHz;

in the figure: the sensor comprises a 1-holding frame, a 2-magnetic film, a 3-TMR tunnel magnetoresistive sensor probe surface, a 4-TMR tunnel magnetoresistive sensor, a 5-eddy current sensor, a 6-bearing, a 7-shaft, an 8-motor, a 9-coupler and a 10-protective cover.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.