CN219512165U

CN219512165U - Aviation bearing ring raceway working layer micro defect ultrasonic detection system

Info

Publication number: CN219512165U
Application number: CN202320032482.3U
Authority: CN
Inventors: 廉德良; 李莹; 张绪胜; 冯兴梅; 华浩然; 刘宏伟; 柏天舒; 王静; 魏天阳; 姜志民
Original assignee: Institute of Metal Research of CAS
Current assignee: Institute of Metal Research of CAS
Priority date: 2023-01-06
Filing date: 2023-01-06
Publication date: 2023-08-11
Anticipated expiration: 2033-01-06

Abstract

An ultrasonic detection system for micro defects of an aviation bearing ring raceway working layer is applied to an ultrasonic nondestructive detection method for micro defects of the aviation bearing ring raceway working layer; the ultrasonic detection system for the micro defects of the working layer of the raceway of the aviation bearing ring meets the following requirements: the ultrasonic probe performs fine geometric scanning along the arc surface of the small-curvature raceway by using the micro-swing-angle ultrasonic scanning unit (1), emits hundred megahertz high-frequency ultrasonic waves, and can detect and distinguish micro defect signals of the surface layer in the ten-micrometer level. The detection system can detect ten-micron-sized micro defects in the working layer of the raceway of the aviation bearing ring, and greatly improves the detection and evaluation capability of the working layer in the aviation bearing ring. The detection system is high in automation degree, and can meet the requirements of higher detection efficiency in the bearing manufacturing stage and the in-service detection stage while ensuring the detection precision.

Description

Aviation bearing ring raceway working layer micro defect ultrasonic detection system

Technical field:

the utility model relates to the technical scheme and application field of industrial nondestructive detection, and particularly provides an ultrasonic detection system for micro defects of an aviation bearing ring raceway working layer.

The background technology is as follows:

in the prior art, the aviation bearing operates in a severe high-speed and high-temperature environment, and the tiny manufacturing defects in the working layer or the tiny defects generated in the using process can cause serious hidden danger to the use safety of the aviation bearing.

At present, aiming at an aviation bearing ring, in a manufacturing stage, a main blank stage of internal defect detection time is adopted, a detection method is a water immersion ultrasonic detection mode, and the detection sensitivity can reachA flat bottom Kong Dangliang. In the near-finished product stage, a method of magnetic powder and vortex is mainly adopted to detect the surface defects of the working layer. In the service monitoring stage, a magnetic powder or penetration method is mainly adopted to detect possible surface cracks.

The working layer of the ferrule is a region directly contacted with the rolling body, is acted by alternating load in the running process, and is a key region for defect detection and detection. The existing ultrasonic water immersion detection system mainly adopts 10MHz ultrasonic waves to detect the upper end face, the lower end face and the outer cylindrical surface of the bearing ring, is limited by the inherent frequency and the ultrasonic path of the ultrasonic waves, has limited detection capability of defects, and cannot effectively detect and identify ten-micron-level defects in the working layer. Therefore, the method is limited by the existing detection equipment, the micro defects of the working layer cannot be effectively detected in the manufacturing stage, and the generation and the expansion of the micro defects of the working layer cannot be effectively monitored earlier in the service stage.

It is therefore desirable to have an ultrasonic detection system for micro defects in the working layer of an aircraft bearing ring raceway.

The utility model comprises the following steps:

the utility model aims to provide a detection system capable of detecting ten-micron-sized micro defects in a working layer of an aviation bearing ring raceway, so that the detection and evaluation capability of the working layer (the most critical area in the ring) in the aviation bearing ring is greatly improved. The detection system is high in automation degree, and can meet the requirements of higher detection efficiency in the bearing manufacturing stage and the in-service detection stage while ensuring the detection precision.

The utility model provides an ultrasonic detection system for micro defects of an aviation bearing ring raceway working layer, which is applied to an ultrasonic nondestructive detection method for micro defects of the aviation bearing ring raceway working layer; the method is characterized in that: the ultrasonic detection system for the micro defects of the working layer of the raceway of the aviation bearing ring meets the following requirements:

the ultrasonic scanning device comprises a micro-swing-angle ultrasonic scanning unit 1, and the micro-swing-angle ultrasonic scanning unit 1 is characterized in that: the ultrasonic probe is provided with a structure capable of enabling the ultrasonic probe to perform fine geometric scanning with scanning resolution as small as 0.01mm along a raceway cambered surface with small curvature as small as 11mm curvature radius, and the ultrasonic probe is provided with a constitution unit capable of emitting high-frequency ultrasonic waves as high as 150 MHz;

The ultrasonic scanning unit 1 with a small swing angle is used for enabling the ultrasonic probe to carry out fine geometric scanning with a scanning resolution of as small as 0.01mm along a raceway cambered surface with a small curvature of as small as 11mm in curvature radius, and high-frequency ultrasonic waves with a high frequency of as high as 150 MHz are emitted, so that micro defect signals with a small as ten-micrometer magnitude of the resolution surface layer can be detected.

The utility model relates to an ultrasonic detection system for micro defects of an aviation bearing ring raceway working layer, which is preferably characterized in that:

the ultrasonic detection system for the micro defects of the working layer of the raceway of the aviation bearing ring comprises the following components: the device comprises a micro-swing-angle ultrasonic scanning unit 1, a signal acquisition and processing unit, an electric control and motion control unit 3, a high-frequency transmitting and receiving module 4 and an upper computer 5; wherein: the upper computer 5 comprises a data acquisition card 5.1 and an upper computer controller 5.2; the upper computer controller 5.2 is connected with the micro-swing-angle ultrasonic scanning unit 1 through the electric control and motion control unit 3; the micro-swing-angle ultrasonic scanning unit 1 is connected with the data acquisition card 5.1 through the high-frequency transmitting and receiving module 4, and the micro-swing-angle ultrasonic scanning unit 1 is also connected with the upper computer controller 5.2 through the data acquisition card 5.1; see fig. 1; wherein:

the micro-swing-angle ultrasonic scanning unit 1 consists of a micro-swing-angle mechanism assembly 1.1, a planar triaxial module 1.2, a bearing clamping and rotating assembly 1.3, a base frame 1.4 and a water tank 1.5; wherein:

The base frame 1.4 is provided with an integrally processed planar triaxial module 1.2 and a mounting plane of the bearing clamping and rotating assembly 1.3, and the parallelism of the planar triaxial module, the bearing clamping and rotating assembly and the mounting plane is required to be within a range of +/-0.02 mm; the planar triaxial module 1.2 adopts a gantry structure and consists of an X-axis unit 1.2.1, a Y-axis unit 1.2.2 and a Z-axis unit 1.2.3; the single axis unit, namely the X axis unit 1.2.1 or the Y axis unit 1.2.2 or the Z axis unit 1.2.3 adopts a ball screw structure, and the repeated positioning precision is required to be within the range of +/-0.05 mm;

the miniature swing angle mechanism assembly 1.1 consists of a circumference angle action unit 1.1.1 and a vertical angle action unit 1.1.2; the two are matched to realize accurate swinging angle rotation in two directions of the circumferential direction and the vertical direction; the miniature swing angle mechanism assembly 1.1 is connected to a sliding block of the Z-axis unit 1.2.3 through a transition flange 1.1.1 c;

the circumference angle action unit 1.1.1 consists of a circumference driving motor 1.1.1a and a hollow rotary table 1.1.1 b; the hollow rotary table 1.1.1b is fixed on the transition flange 1.1.1c, and is further connected with a circumference driving motor 1.1.1a, and the circumference driving motor 1.1.1a drives the hollow rotary table 1.1.1b to realize rotation;

the rotating part of the hollow rotating platform 1.1.1b is connected with the upper surface of the motor mounting frame 1.1.2 of the vertical angle action unit 1.1.2 through the matching surface in a threaded manner;

The vertical angle action unit 1.1.2 consists of a motor mounting frame 1.1.2a, a vertical angle driving motor 1.1.2B, a connecting sleeve 1.1.2c, a quincuncial jackscrew coupler 1.1.2d, a B angle transmission shaft 1.1.2e, a miniature corner device 1.1.2f, a probe frame 1.1.2g and a probe 1.1.2 h; the vertical angle driving motor 1.1.2B drives the vertical shaft of the miniature corner device 1.1.2f to rotate through the quincuncial jackscrew coupler 1.1.2d and the B angle transmission shaft 1.1.2e in sequence; the miniature corner device 1.1.2f is of a bevel gear structure, converts circumferential rotation into rotation in the vertical direction, and drives the probe frame 1.1.2g to realize angle swing in the vertical direction; the probe 1.1.2h is a high-frequency ultrasonic probe focused by water immersion, the size diameter of a shell of the probe 1.1.2h is smaller than 12.5mm, the focal distance in water is larger than 8mm, and the focal diameter range is 0.3mm-1mm;

the bearing clamping and rotating assembly 1.3 consists of three parts: a rotary driving unit 1.3.1, a rotary sealing and transmission unit 1.3.2 and a bearing clamping unit 1.3.3;

the rotary seal and transmission unit 1.3.2 comprises: transmission shaft a1.3.2a, inner and outer race integrated RU-type crossed roller bearing 1.3.2b, 109 series seal ring 1.3.2c, reference flange seat 1.3.2d, transmission shaft b1.3.2f;

the rotary drive unit 1.3.1 comprises: a rotary driving motor 1.3.1a, a suspension motor mounting seat 1.3.1b and a coupler 1.3.1c;

The bearing clamping unit 1.3.3 comprises a chuck mounting reference base 1.3.3a, a chuck 1.3.3b and a jaw 1.3.3c;

the three units forming the bearing clamping and rotating assembly 1.3, namely the rotating driving unit 1.3.1, the rotating sealing and transmission unit 1.3.2 and the bearing clamping unit 1.3.3, meet the following requirements:

the rotary sealing and transmission unit 1.3.2 is fixed on the bottom surface of the water tank 1.5; the fixing mode is that the standard flange seat 1.3.2d falls on a round mounting surface of the water tank 1.5, waterproof glue is paved on the mounting surface, the waterproof glue is fixed on the bottom surface of the water tank 1.5 by adopting screws from top to bottom, and a threaded hole on the bottom surface of the water tank 1.5 does not penetrate through the bottom surface of the water tank 1.5;

secondly, the rotary driving unit 1.3.1 is fixed on the rotary sealing and transmission unit 1.3.2; the fixing mode is as follows: connecting the suspension motor mounting seat 1.3.1b with the reference flange seat 1.3.2d from bottom to top through threads; an output shaft of a rotary driving motor 1.3.1a in the rotary driving unit 1.3.1 is connected with the lower end of a transmission shaft B1.3.2f through a coupler 1.3.1 c;

thirdly, the bearing clamping unit 1.3.3 is connected with the upper end of the transmission shaft b1.3.2f through a key slot.

The ultrasonic detection system for the micro defects of the working layer of the raceway of the aviation bearing ring meets one or a combination of the following requirements:

The first signal acquisition processing unit includes: an encoder and an AD analog-to-digital acquisition card; the method can realize real-time simultaneous acquisition of the position and the AD value of the micro defect, and the upper computer 5 processes the AD value to realize imaging display;

the working requirements of the signal acquisition processing unit are as follows: based on the software internal trigger of the PCI8910e analog-to-digital acquisition card, the encoder pulse is used as an external clock to acquire an AD value, and a continuous acquisition mode is adopted to acquire a true accurate value of a motion position and a corresponding AD value and store the true accurate value and the corresponding AD value into a cache;

the signal acquisition processing unit receives ultrasonic echo signals from an ultrasonic detection system for the micro defects of the working layer of the raceway of the aviation bearing ring through the data acquisition card, so that ultrasonic detection data can be further analyzed and processed; the signal acquisition processing unit selects a PCIe8910 type high-speed data acquisition card;

secondly, the signal acquisition processing unit meets the following requirements:

the ultrasonic detection system for the micro defects of the working layer of the aviation bearing ring race carries out ultrasonic detection under the condition of water immersion aiming at the micro defects, adopts a PCIe8910 type high-speed data acquisition card, and starts the acquisition and transmission of ultrasonic original data after the initialization setting of the high-speed data acquisition card is completed;

the radio frequency output port of the aviation bearing ring raceway working layer micro defect ultrasonic detection system outputs an ultrasonic echo analog signal, the high-speed data acquisition card converts the ultrasonic echo analog signal into an ultrasonic echo digital signal based on an A/D conversion method, the PCIe bus connects the high-speed data acquisition card with the upper computer, and the upper computer software realizes the acquisition function of the ultrasonic echo digital signal by calling a data acquisition function and analyzes and processes the signal;

Thirdly, the ultrasonic A scanning signal acquisition mode meets the following requirements:

the ultrasonic detection system for the micro defects of the working layer of the raceway of the aviation bearing ring designs two motion scanning modes: an automatic acquisition mode and a local acquisition mode; the two acquisition modes need the mutual coordination and cooperation of the ultrasonic data acquisition and motion control functions;

the automatic acquisition mode is to carry out comprehensive scanning on a detected sample, and the scanning movement mode of the ultrasonic probe is as follows: the probe starts to move from a set origin, performs uniform scanning movement along the positive direction of the X axis of the system, then moves by one step along the positive direction of the Y axis of the system, performs uniform scanning movement along the negative direction of the X axis of the system, circulates in sequence, and finally completes the comprehensive scanning task;

the local acquisition mode mainly performs local area scanning work: after the tested test piece is completely scanned, in order to meet the repeated detection requirement of the defects, after a user sets a local acquisition range, the ultrasonic probe moves to the initial position of the local range, and local scanning is started;

and the user compares the ultrasonic detection results of the automatic acquisition mode and the local acquisition mode, and judges whether the local detection result replaces the original detection result or not.

First, the electronic control and motion control unit 3 includes: a power control module and a motion control module;

the power control module can perform one or a combination of the following functions: 220VAC AC power supply, 24VDC DC power supply, overcurrent protection of current;

the motion control module uses an MPC08E type motion control card, which can perform the following functions: the six-axis programmable motion control in the miniature swing angle scanning unit comprises: the PCI interface comprises a motion control card, a driver, an incoming line filter and a motor; the working mode is as follows: the motion control card is arranged in the industrial personal computer and is communicated with the industrial personal computer through a PCI bus, and when the motion control card receives a software instruction, pulse signals for pulse and direction control are generated and sent to the motor driver; the motor driver drives the motor to rotate, and meanwhile, an encoder which is positioned at the tail end of the motor and coaxially rotates with the motor generates a position signal and returns the position signal to the driver, so that a closed loop control is formed, and high-precision displacement is realized; when the motor moves to the two ends of the shaft, the motor touches the limit switch, and when the limit switch acts, the generated signal is transmitted to the motion control card, the motion control card immediately stops outputting the pulse signal, and the motor stops moving continuously;

The servo motor system for single-axis motion control adopts the Siemens V90 series; the MPC08E type motion control card is a core device for controlling the rotation of a servo motor, is arranged in an industrial personal computer, realizes two-way communication with the industrial personal computer through a PCI bus, and when receiving an instruction of motion control software in an upper computer module, the motion control card sends a pulse signal to a servo motor driver, the servo motor driver drives the servo motor to rotate, and meanwhile, an encoder which is positioned at the tail end of the servo motor and coaxially rotates with the servo motor generates a position signal and returns the position signal to the driver to form closed-loop control so as to realize high-precision motion control; when the scanning mechanism moves to the two ends of the shaft, the limit switch is touched, and when the motion control card receives signals transmitted by the limit switch, the output of pulse signals is immediately stopped, and the servo motor is immediately stopped rotating;

secondly, the model 4 of the high-frequency transmitting and receiving module is UT340, the transmitter index meets the excitation voltage of 100V to 500V, the rising edge and the falling edge of the excitation pulse are smaller than 2ns, the excitation pulse width is 5.0ns to 80ns, and the repetition frequency is 200-20kHz; the receiver index should meet the bandwidth of 1MHz-150MHz; the system also has a real-time A-scanning analog signal output interface;

Third, the upper computer controller 5.2 of the upper computer 5 is a Mithroughout 610L series, and is provided with an i7 processor, a memory 16G and a hard disk 1T, and is provided with at least two PCI/PCIe interfaces.

the signal acquisition processing unit receives ultrasonic echo signals from an ultrasonic detection system for the micro defects of the working layer of the raceway of the aviation bearing ring through the data acquisition card, so that ultrasonic detection data can be further analyzed and processed; in order to meet the requirement of high-speed data transmission of a system, a PCIe8910 type high-speed data acquisition card is selected as the signal acquisition processing unit;

the PCIe8910 type high-speed data acquisition card is a 2-channel 8-bit 2GS/s high-speed data acquisition card, the single-channel sampling rate is 1GS/s, the input impedance can be selected to be 50 omega or 1MΩ, and the on-board memory is 2GB. A block diagram of a PCIe8910 acquisition card system is shown in FIG. 11.

(1) Analog input: PCIe8910 high speed data acquisition cards integrate CH0 and CH1 analog signal input channels. The analog input channel can use 0.2V, 0.5V, 1V, 2V or 5V voltage gear, and the high-speed acquisition card realizes the function of 8-bit A/D data conversion in order to ensure that the acquired ultrasonic echo signals are not distorted.

(2) And the acquisition system comprises: the sampling clock source supports an internal clock and an external clock, and the sampling rate range is 200S/S-2GS/S.

(3) And (3) data storage: when a user only needs to collect instantaneous data before and after a certain event or the hardware environment cannot meet the continuous collection requirement, the PCIe8910 high-speed data collection card can adopt a finite point sampling mode, the collected data is temporarily stored in a 2GB memory of the board card, the data in the board card cache is uploaded to an upper computer through a DMA (direct memory access) controller after collection is finished, two-channel ADC (analog-digital converter) samples at the highest sampling rate, the AD data can be cached for 1 second at maximum, and if the frequency is reduced or the channel number caching time is reduced, the AD data can be longer.

(4) Triggering: the high-speed data acquisition card of the system adopts a repeated trigger mode of post-trigger and delay trigger, the trigger mode can obtain sampling data with specified length after a limited trigger event and store the sampling data on an onboard memory of the acquisition card, and when the length of the sampling data is greater than the length of specified transmission data, the sampling data is transmitted to a memory of an upper computer through a PCIe bus. The repeated trigger pattern of the post trigger and the delay trigger is shown in fig. 12.

The interface of the PCIe8910 type high-speed data acquisition card is shown in fig. 13: CH0 and CH1 are analog signal input channel interfaces, EXT_TRIG is an external trigger input interface, CLK_IN is an external clock or an external 10M clock input port, and P1 is a system synchronous trigger bus interface;

the ultrasonic detection system for the micro defects of the working layer of the aviation bearing ring race aims at the micro defects to carry out ultrasonic detection under the water immersion condition, a PCIe8910 type high-speed data acquisition card is adopted, after a dynamic link library environment is created in software, the PCIe8910 type high-speed data acquisition card is subjected to registration operation, and an equipment object is created, and the acquisition and transmission of ultrasonic original data can be started after the initialization setting of the high-speed data acquisition card is completed; a specific data acquisition flow is shown in fig. 14.

The method comprises the steps that ultrasonic data acquisition software which is independently developed acquires ultrasonic original signals through a high-speed data acquisition card based on a PCIe bus, an ultrasonic echo analog signal is output from a radio frequency output port of an ultrasonic detection system with tiny defects on an aviation bearing ring raceway working layer, the high-speed data acquisition card is converted into an ultrasonic echo digital signal based on an A/D conversion method, the high-speed data acquisition card is connected with an upper computer through the PCIe bus, and the upper computer software realizes the acquisition function of the ultrasonic echo digital signal by calling a data acquisition function and analyzes and processes the signals; a software data collection flow chart is shown in fig. 15.

the ultrasonic A scanning signal acquisition unit is a functional unit structure with a motion scanning mode, namely an automatic acquisition mode and a local acquisition mode; the ultrasonic detection system for the micro defects of the working layer of the raceway of the aviation bearing ring designs two motion scanning modes: an automatic acquisition mode and a local acquisition mode; in order to realize more accurate detection work, the two acquisition modes need the mutual coordination of ultrasonic data acquisition and motion control functions;

the power control module has the following functions: 220VAC AC power supply, 24VDC DC power supply, overcurrent protection of current;

the motion control module realizes the following functions: the six-axis programmable motion control in the miniature swing angle scanning unit comprises: the PCI interface comprises a motion control card, a driver, an incoming line filter and a motor;

the working mode is as follows: the motion control card is arranged in the industrial personal computer and is communicated with the industrial personal computer through a PCI bus, and when the motion control card receives a software instruction, pulse signals for pulse and direction control are generated and sent to the motor driver; the motor driver drives the motor to rotate, and meanwhile, an encoder which is positioned at the tail end of the motor and coaxially rotates with the motor generates a position signal and returns the position signal to the driver, so that a closed loop control is formed, and high-precision displacement is realized; when the motor moves to the two ends of the shaft, the motor touches the limit switch, and when the limit switch acts, the generated signal is transmitted to the motion control card, the motion control card immediately stops outputting the pulse signal, and the motor stops moving continuously;

The utility model also relates to a control module design based on PCI bus motion control card

Motion control card:

the MPC08E type motion control card is a digital servo motor control module based on a PCI bus, the motion control card and an upper computer form a master-slave structure, the upper computer is mainly responsible for parameter setting and real-time monitoring of a control system, and the MPC08E type motion control card can realize the functions of automatic lifting and descending, pulse and direction signal output, origin, limit signal detection and the like.

The MPC08E type motion control card can realize the control function of a four-axis digital servo motor, and each axis can output pulse and direction signals to control the rotation of the servo motor. And the device can be externally connected with switch signals such as an origin, speed reduction, limit and the like so as to realize functions of origin return, protection and the like, and the switch signals are automatically detected and responded by an MPC08E type motion control card. A schematic diagram of the MPC08E motion control card architecture is shown in fig. 16.

Servo motor driver:

the servo motor system for single-axis motion control adopts the Siemens V90 series, and compared with the same brand, the Siemens servo motor has excellent electromagnetic compatibility, is provided with the incoming line filter, controls the line of the original factory motor, is effectively grounded, can reduce the space electromagnetic interference generated by the motor to a certain extent, and reduces the influence on a detection system.

The motion control card is a core device for controlling the servo motor to rotate, is arranged in the industrial personal computer, realizes two-way communication with the industrial personal computer through a PCI bus, and when receiving an instruction of motion control software in the upper computer module, the motion control card can send a pulse signal to a servo motor driver, the servo motor driver drives the servo motor to rotate, and meanwhile, an encoder which is positioned at the tail end of the servo motor and coaxially rotates with the servo motor generates a position signal and returns the position signal to the driver, so that closed-loop control is formed, and high-precision motion control is realized. When the scanning mechanism moves to the two ends of the shaft, the limit switch is touched, and when the motion control card receives signals transmitted by the limit switch, the output of pulse signals is stopped immediately, and the servo motor stops rotating immediately. The principle of uniaxial control is shown in figure 10.

(1) Motion control software design

The motion control software realizes the functions of servo motor motion parameter setting, scanning motion mode setting, encoder feedback information processing display and the like based on the MPC08E motion control card dynamic link library. The flow chart of the motion control software in the upper computer module is shown in fig. 17.

The system software firstly completes the initialization work of the MPC08E motion control card, and the initialization work mainly carries out card number and shaft number allocation by calling two functions, namely auto_set and init_Board in an MPC08E function library and automatically detecting the MPC08E card number and the shaft number of each card used by the system through the auto_set function; the init-board function initializes the control card, mainly initializes each register of the control card, pulse output mode (pulse/direction) of each axis and default speed setting of various movement modes.

After initializing the MPC08E motion control card, the user needs to complete the parameter setting of the servo motor and the motion mode, and save the setting parameters as default parameters, if the user does not perform parameter setting, the system uses the saved default parameters.

After the motion control related parameters are determined, the motion control software waits for a motion command signal to be input in a blocking state, when a new motion command signal is received, if the motion command signal is effective, the motion command signal is executed, and the system receives a feedback signal of an encoder in real time and judges whether the current motion state needs to be corrected or not.

thirdly, the upper computer controller 5.2 of the upper computer 5 is a Hua 610L series, an i7 processor, a memory 16G and a hard disk 1T are carried, a plurality of PCI/PCIe interfaces are arranged, and the configuration of the industrial personal computer can ensure the smooth operation of detection system software;

After the functions of the micro-defect water immersion ultrasonic imaging software module are deeply analyzed, a micro-defect water immersion ultrasonic imaging software module frame is designed as shown in fig. 18. The micro-defect water immersion ultrasonic imaging software system mainly comprises a main control module, an ultrasonic A scanning imaging module, an ultrasonic data processing module, an ultrasonic C scanning imaging module, a file management module and other functional modules. The software interface is implemented by adopting a Python programming language and is based on a PyQt framework.

(1) Main control module

The main control module is a flow control center of the whole ultrasonic imaging software, and the corresponding flow control is shown in fig. 19. It can be seen from the figure that when the ultrasonic imaging software is started, the man-machine interaction interface is initialized firstly, the initialization parameters mainly comprise signal and slot binding and loading configuration, socket communication tests among the modules are carried out after the initialization work is completed, meanwhile, a software system can create multiple threads to prevent the interface from being blocked when the response time of data processing is long, and the main control module enters a blocking state to wait for instruction signals.

In the normal running process of the system, the user sets and modifies parameters on the software interface to realize the control of the water immersion ultrasonic detection flow. The main control module is responsible for configuring detection parameters, controlling ultrasonic A scanning display, controlling ultrasonic C scanning display, controlling data processing and storage, software closing and other functions. The detection parameters comprise water immersion ultrasonic detection process parameters and motion state control parameters, the detection parameters modified in setting are checked and judged, and if the data are abnormal, a user is prompted to reset error parameters. The control of the ultrasonic A scanning display is to send instructions to control the functions of refreshing display, freezing or emptying of ultrasonic A scanning waveforms and the like. The control of the ultrasonic C-scan display is to send instructions to control the functions of refreshing display, freezing, emptying or local updating of the ultrasonic C-scan image. The control data processing and saving refers to the functions of signal noise reduction, data merging and saving and the like of the transmission instruction control data processing module. The system exit means that the user can automatically save the current system parameters when closing the software.

(2) Ultrasonic A-scan imaging module

The ultrasonic A scanning imaging module is a basic application module of the water immersion ultrasonic detection system and mainly comprises an ultrasonic A scanning waveform display module and an electronic gate setting module.

The ultrasonic A scanning imaging module performs real-time refreshing display on signals acquired by the ultrasonic flaw detector, supports setting and modifying of waveform display refresh rate, sets the display range of sampling waveforms with adjustable delay and width of ultrasonic A scanning signals, drags a right button of a mouse to perform scalable display, and meets the display requirements of low delay and high refresh rate of the ultrasonic A scanning signals. Four gates of different colors are arranged in the waveform display interface I, A, B, C, and gate delay, width and amplitude are set to change the gate display position. The detection modes mainly comprise a positive half wave mode, a negative half wave mode, a full wave mode and a radio frequency wave mode, and different detection display modes meet different water immersion ultrasonic detection requirements. The effective discrimination of the micro defects can be realized by improving the amplitude gain of the echo signal.

The electronic gate setting module is a basic functional module for water immersion ultrasonic detection and mainly comprises gate enabling selection, gate alarm logic setting, gate position setting and the like. The gate enabling selection is to activate the selected gate according to the detection requirement from four gates I, A, B, C. The gate alarm logic is used for selecting different gate alarm modes, and comprises functions of higher gate amplitude alarm, lower gate amplitude alarm and closing alarm, wherein higher gate alarm means that the maximum value of an ultrasonic echo signal in a gate is higher than the amplitude of the gate, lower gate alarm means that the minimum value of the ultrasonic echo signal in the gate is lower than the amplitude of a wild goose, and closing alarm means that the gate alarm function is closed. The gate position setting means that a user determines the position of the gate by modifying parameters such as delay, width, amplitude and the like of the gate.

(3) Ultrasonic data processing module

The main functions of the ultrasonic data processing module include signal noise reduction, image enhancement and ultrasonic C-scan amplitude generation of data in an ultrasonic A-scan gate. Firstly, one-dimensional data read from a shared memory is converted into a two-dimensional array according to the set group number, the maximum value in the gate range in each group of data is intercepted, and the maximum value is sent to C scanning imaging software through a Socket. The data noise reduction function is realized in the ultrasonic data processing module, and the noise reduction processing does not influence the ultrasonic A scanning imaging module to read data from the shared memory. Because the stored data volume is large, the time consumption of file reading and writing increases along with the increase of the stored data volume, so that the batch data storage is considered in the scanning process, and the batch data is stored in a summary way after the scanning is finished. If one sub-file is saved in batches, the ultrasonic data processing module reads the file to perform noise reduction processing, so that the stability of reading the ultrasonic A scanning imaging software data in the scanning process is ensured.

(4) Ultrasonic C-scan imaging module

The ultrasonic C-scan imaging display module is responsible for dynamic refreshing display of ultrasonic C-scan images. Amplitude data received by Socket is gray value, and gray image can be converted into RGB color image through RGB color mapping strategy processing. The RGB color mapping policy setting software interface is shown in fig. 20. The mapping strategy is to determine the mapping relation of the gray map to the RGB color image according to 9 colors and 7 corresponding variable thresholds. The RGB color strategy is shown in fig. 21. The image display is realized based on a QLabel control of a PyQt framework, and the image refresh rate is determined by the image refresh display frequency in the scanning parameters. The image width and height direction scales are changed accordingly according to the change in the image size.

(5) File management module

The file management module is mainly responsible for data storage work of the water immersion ultrasonic detection system. The original data volume of the water immersion ultrasonic detection is large, so the data management mode of the water immersion ultrasonic detection system is very important.

The files required to be saved for water immersion ultrasonic detection comprise water immersion ultrasonic detection management information and ultrasonic detection original radio frequency data. The water immersion ultrasonic detection management information mainly comprises a user name, a test piece number and remark information. The detected sample and the detection data can be correlated by reading the stored information, so that the detection personnel can manage the detected sample conveniently. The ultrasound data includes ultrasound a-scan radio frequency signals, ultrasound C-scan images, and scan coordinate locations. The storage mode of ultrasonic detection management information and detection original data is mainly HDF5 file storage.

Inter-process communication design:

the ultrasonic detection system software adopts a modularized development mode, the main control software transmits instruction signals of a user interface to corresponding module software, the data acquisition software transmits acquired ultrasonic A scanning data to the ultrasonic A scanning display module, and the data processing module transmits ultrasonic C scanning amplitude generated in ultrasonic A scanning gate data to the ultrasonic C scanning display module, so that the data communication between the modules is ensured to be normal and has important significance for the stable operation of the system.

Inter-process communication refers to the transfer of data between different processes. Shared memory Mmap and Socket are common inter-process communication modes. The essence of shared memory is that a section of memory which can be accessed by other processes is mapped, mmap is a method for mapping files to address space of the processes, the mapping relation between a section of virtual address and file disk address in the address space of the processes is realized, and the processes can perform read-write operation on the section of memory by utilizing the index, so that the efficient transmission of large-scale data among the processes can be realized. A schematic illustration of the Mmap principle is shown in FIG. 22.

Socket is a protocol for communication between computers. Socket is mainly divided into two modes, TCP and UDP. TCP (Transmission Control Protocol) is a connection-oriented and reliable transport layer communication protocol. UDP (User Datagram Protocol) is a connectionless transport layer user datagram protocol. According to the characteristics of the communication mode between the Mmap and the Socket process, the shared memory Mmap is selected as the communication mode of the data acquisition module and the ultrasonic A scanning display module, the ultrasonic C scanning amplitude data is transmitted to the ultrasonic C scanning display module by the ultrasonic A scanning display module through the UDP mode of the Socket, and the program control instruction is transmitted by the TCP module of the Socket.

The flow chart of ultrasonic A scanning radio frequency signal transmission based on the shared memory is shown in fig. 23, and the specific steps of ultrasonic A scanning radio frequency signal transmission of the motion control and data acquisition module are as follows:

(1) Starting initialization and creating 2 cache arrays;

(2) Judging whether the ultrasonic A scanning waveform is displayed or not, if the ultrasonic A scanning waveform is continuously refreshed, acquiring data from the high-speed data acquisition card, and if the ultrasonic A scanning waveform is not refreshed, ending;

(3) M groups of data acquired in the high-speed data acquisition card are written into a cache array according to the pointer 3;

(4) After the cache array is full, adding a sequence number into the first bit of the cache array, and writing data into the shared memory 1;

(5) The pointer 3 is shifted, and the step (2) is repeated.

The specific steps for reading the ultrasonic A scanning radio frequency signals by the ultrasonic A scanning display module are as follows:

(1) Data is read from the shared memory. Converting the data from byte type into 8-bit unsigned integer, judging whether the first bit of the data is the same as the data read last time, if so, not updating the data in the shared memory, continuing to read the data from the shared memory, and if not, indicating that new ultrasonic A scanning radio frequency data is read;

(2) Dividing the ultrasonic A scanning radio frequency data read once into a plurality of groups, obtaining an ultrasonic C scanning amplitude value according to the dynamic gate range by each group, and transmitting the ultrasonic C scanning amplitude value to an ultrasonic C scanning display module through a UDP mode of a Socket;

(3) Storing ultrasonic A scanning radio frequency data into an HDF5 file;

(4) Updating the waveform of the ultrasonic A scanning display area;

(5) Repeating the step (1).

The flow chart of ultrasonic C scanning amplitude data transmission based on UDP mode in Socket is shown in figure 24, the ultrasonic A scanning display module is used as UDP service end, the specific steps of data transmission are as follows:

(1) After the ultrasonic A scanning display module is initialized, a Socket is created, and a local IP and a port number of the Socket are set;

(2) The ultrasonic A scanning display module enters a blocking state to wait for data;

(3) The ultrasonic A scanning display module receives the data transmitted by the ultrasonic C scanning display module and transmits return data to the ultrasonic C scanning display module;

(4) And (5) ending data transmission of the ultrasonic A scanning display module and the ultrasonic C scanning display module, and closing the Socket.

The ultrasonic C scanning display module is used as a UDP client, and the specific steps of data transmission are as follows:

(1) Creating a Socket after initializing the ultrasonic C scanning display module;

(2) The ultrasonic C scanning display module is connected with the ultrasonic A scanning display module and then transmits data to receive return data;

(3) And (5) ending data transmission of the ultrasonic A scanning display module and the ultrasonic C scanning display module, and closing the Socket.

The transmission flow chart of the command signal based on the TCP mode in the Socket is shown in fig. 25, the main control module is used as a TCP server, and the specific steps of data transmission are as follows:

(1) After the main control module is initialized, a Socket is created, and a local IP and a port number of the Socket are set;

(2) The master control module starts monitoring connection;

(3) The main control module enters a blocking state and continuously receives a connection request of the ultrasonic C scanning display module;

(4) The main control module receives data transmitted by the ultrasonic C scanning display module and transmits the data to the ultrasonic C scanning display module to return the data;

(5) And after the transmission of the main control module and the ultrasonic C scanning display module is finished, closing the Socket.

(1) After the ultrasonic C scanning display module is initialized, a Socket is created and connected with the IP and the port number address of the main control module;

(2) After the TCP connection between the ultrasonic C scanning display module and the main control module is successful, sending data and receiving returned data;

(3) And after the transmission of the main control module and the ultrasonic C scanning display module is finished, closing the Socket.

The instruction signal sent by the main control module and the analysis thereof are shown in table 1

TABLE 1 command signal resolution

The utility model provides a detection system capable of detecting ten-micron-level micro defects in a raceway working layer of an aviation bearing ring, and the detection and evaluation capability of the working layer (the most critical area in the ring) in the aviation bearing ring is greatly improved. The detection system is high in automation degree, and can meet the requirements of higher detection efficiency in the bearing manufacturing stage and the in-service detection stage while ensuring the detection precision.

Compared with the prior art, the ultrasonic detection system provided by the utility model can be used for scanning from the side of the working layer of the small-curvature rollaway nest, and can effectively detect and evaluate the micro defects of the working layer in the order of ten micrometers by adopting ultrasonic waves of up to 150 MHz.

Description of the drawings:

FIG. 1 is a schematic block diagram of the system for ultrasonic detection of micro defects of the working layer of an aviation bearing ring raceway;

fig. 2 is a schematic diagram of the principle of the micro swing angle ultrasonic scanning unit 1;

fig. 3 is a schematic diagram of the principle of construction of the base frame 1.4;

fig. 4 is a schematic diagram of the principle of construction of the planar triaxial module 1.2;

FIG. 5 is a schematic front view of the principle of construction of the miniature swing angle mechanism assembly 1.1;

FIG. 6 is a schematic diagram of the principle of construction of the miniature swing angle mechanism assembly 1.1 in a right side view;

FIG. 7 is a schematic front view of the principle of construction of the bearing clamping and rotating assembly 1.3;

FIG. 8 is a cross-sectional view A-A of FIG. 7;

FIG. 9 is a circuit diagram of an EN02 scanning signal processing module;

fig. 10 is a schematic block diagram of the electronic control and motion control unit 3;

FIG. 11 is a block diagram of a PCIe8910 acquisition card system;

FIG. 12 is a repetitive trigger pattern of post-trigger and time delay trigger;

FIG. 13 is a PCIe8910 data acquisition card interface;

FIG. 14 is a flow chart of a high speed acquisition card data acquisition;

FIG. 15 is a software data collection flow chart;

FIG. 16 is a schematic diagram of the MPC08E type motion control card architecture;

FIG. 17 is a flow chart of motion control software;

FIG. 18 is a block diagram of an ultrasound imaging software module;

FIG. 19 is a flow chart of a master control module;

FIG. 20 is a diagram of an RGB color mapping policy setting software interface;

FIG. 21 is an RGB color mapping strategy;

FIG. 22 is a schematic illustration of the Mmap principle;

FIG. 23 is a flow chart of data transfer based on shared memory;

fig. 24 is a data transmission flow chart based on the UDP mode in socket;

fig. 25 is a data transmission flow chart based on the TCP mode in socket.

The specific embodiment is as follows:

the meaning of the reference numerals and the accompanying drawings are as follows:

micro-swing angle ultrasonic scanning unit 1: miniature swing angle mechanism assembly 1.1: a circumferential angle action unit 1.1.1, a circumferential driving motor 1.1.1a, a hollow rotary table 1.1.1b and a transition flange 1.1.1c; the vertical angle action unit 1.1.2 comprises a motor mounting frame 1.1.2a, a vertical angle driving motor 1.1.2B, a connecting sleeve 1.1.2c, a quincuncial jackscrew coupler 1.1.2d, a B angle transmission shaft 1.1.2e, a miniature corner device 1.1.2f, a probe frame 1.1.2g and a probe 1.1.2h; planar triaxial module 1.2: x-axis unit 1.2.1, Y-axis unit 1.2.2, Z-axis unit 1.2.3, angle synchronizer 1.2.4, bearing clamping rotation assembly 1.3: rotary drive unit 1.3.1: a rotary driving motor 1.3.1a, a suspension motor mounting seat 1.3.1b and a coupler 1.3.1c; the rotary sealing and transmission unit 1.3.2 comprises a transmission shaft 1.3.2a, an inner ring and outer ring integrated RU type crossed roller bearing 1.3.2b, 109 series sealing rings 1.3.2c and a reference flange seat 1.3.2d; bearing clamping unit 1.3.3: the chuck is provided with a reference base 1.3.3a, a chuck 1.3.3b, a clamping jaw 1.3.3c, a detection bearing 1.3.4 and a speed reducer 1.3.5; 1.4 parts of a base frame and 1.5 parts of a water tank;

The system comprises a signal acquisition processing unit 2, an electric control and motion control unit 3, a high-frequency transmitting and receiving module 4 and an upper computer 5: a data acquisition card 5.1 and an upper computer controller 5.2.

Example 1

An ultrasonic detection system for micro defects of an aviation bearing ring raceway working layer is applied to an ultrasonic nondestructive detection method for micro defects of the aviation bearing ring raceway working layer; the method is characterized in that: the ultrasonic detection system for the micro defects of the working layer of the raceway of the aviation bearing ring meets the following requirements: the ultrasonic scanning device comprises a micro-swing-angle ultrasonic scanning unit 1, and the micro-swing-angle ultrasonic scanning unit 1 is characterized in that: the ultrasonic probe is provided with a structure capable of enabling the ultrasonic probe to perform fine geometric scanning with scanning resolution as small as 0.01mm along a raceway cambered surface with small curvature as small as 11mm curvature radius, and the ultrasonic probe is provided with a constitution unit capable of emitting high-frequency ultrasonic waves as high as 150 MHz;

the ultrasonic probe performs fine geometric scanning with scanning resolution of as small as 0.01mm along a small curvature raceway cambered surface with a curvature radius of as small as 11mm by using the micro-swing angle ultrasonic scanning unit 1, and emits high-frequency ultrasonic waves with a frequency of as high as 150 MHz, so that micro defect signals with a frequency of as small as ten micrometers on a resolution surface layer can be detected.

The micro-angle ultrasonic scanning unit 1 consists of a micro-swing angle mechanism assembly 1.1, a plane triaxial module 1.2, a bearing clamping and rotating assembly 1.3, a base frame 1.4 and a water tank 1.5; wherein:

secondly, the rotary driving unit 1.3.1 is fixed on the rotary sealing and transmission unit 1.3.2; the fixing mode is as follows: connecting the suspension motor mounting seat 1.3.1b with the reference flange seat 1.3.2d from bottom to top through threads; an output shaft of a rotary driving motor 1.3.1a in the rotary driving unit 1.3.1 is connected with the lower end of a transmission shaft B1.3.2f through a coupler 1.3.1c;

thirdly, the ultrasonic A scanning signal acquisition unit is a functional unit structure with a motion scanning mode of an automatic acquisition mode and a local acquisition mode; the ultrasonic A scanning signal acquisition mode meets the following requirements: the ultrasonic detection system for the micro defects of the working layer of the raceway of the aviation bearing ring designs two motion scanning modes: an automatic acquisition mode and a local acquisition mode; the two acquisition modes need the mutual coordination and cooperation of the ultrasonic data acquisition and motion control functions;

the PCIe8910 type high-speed data acquisition card is a 2-channel 8-bit 2GS/s high-speed data acquisition card, the single-channel sampling rate is 1GS/s, the input impedance can be selected to be 50 omega or 1MΩ, and the on-board memory is 2GB. The PCIe8910 acquisition card system block diagram is shown in FIG. 11.

(5) Analog input: PCIe8910 high speed data acquisition cards integrate CH0 and CH1 analog signal input channels. The analog input channel can use 0.2V, 0.5V, 1V, 2V or 5V voltage gear, and the high-speed acquisition card realizes the function of 8-bit A/D data conversion in order to ensure that the acquired ultrasonic echo signals are not distorted.

(6) And the acquisition system comprises: the sampling clock source supports an internal clock and an external clock, and the sampling rate range is 200S/S-2GS/S.

(7) And (3) data storage: when a user only needs to collect instantaneous data before and after a certain event or the hardware environment cannot meet the continuous collection requirement, the PCIe8910 high-speed data collection card can adopt a finite point sampling mode, the collected data is temporarily stored in a 2GB memory of the board card, the data in the board card cache is uploaded to an upper computer through a DMA (direct memory access) controller after collection is finished, two-channel ADC (analog-digital converter) samples at the highest sampling rate, the AD data can be cached for 1 second at maximum, and if the frequency is reduced or the channel number caching time is reduced, the AD data can be longer.

(8) Triggering: the high-speed data acquisition card of the system adopts a repeated trigger mode of post-trigger and delay trigger, the trigger mode can obtain sampling data with specified length after a limited trigger event and store the sampling data on an onboard memory of the acquisition card, and when the length of the sampling data is greater than the length of specified transmission data, the sampling data is transmitted to a memory of an upper computer through a PCIe bus. The repeated trigger pattern of the post trigger and the delay trigger is shown in fig. 12.

the ultrasonic detection system for the micro defects of the working layer of the raceway of the aviation bearing ring designs two motion scanning modes: an automatic acquisition mode and a local acquisition mode; in order to realize more accurate detection work, the two acquisition modes need the mutual coordination of ultrasonic data acquisition and motion control functions;

The ultrasonic detection system for the micro defects of the working layer of the aviation bearing ring raceway meets the following requirements:

the power control module realizes the following functions: 220VAC AC power supply, 24VDC DC power supply, overcurrent protection of current;

Control module design based on PCI bus motion control card:

motion control card:

Servo motor driver:

(1) Motion control software design

(6) Main control module

(7) Ultrasonic A-scan imaging module

(8) Ultrasonic data processing module

(9) Ultrasonic C-scan imaging module

(10) File management module

Inter-process communication design:

(6) Starting initialization and creating 2 cache arrays;

(7) Judging whether the ultrasonic A scanning waveform is displayed or not, if the ultrasonic A scanning waveform is continuously refreshed, acquiring data from the high-speed data acquisition card, and if the ultrasonic A scanning waveform is not refreshed, ending;

(8) M groups of data acquired in the high-speed data acquisition card are written into a cache array according to the pointer 3;

(9) After the cache array is full, adding a sequence number into the first bit of the cache array, and writing data into the shared memory 1;

(10) The pointer 3 is shifted, and the step (2) is repeated.

(6) Data is read from the shared memory. Converting the data from byte type into 8-bit unsigned integer, judging whether the first bit of the data is the same as the data read last time, if so, not updating the data in the shared memory, continuing to read the data from the shared memory, and if not, indicating that new ultrasonic A scanning radio frequency data is read;

(7) Dividing the ultrasonic A scanning radio frequency data read once into a plurality of groups, obtaining an ultrasonic C scanning amplitude value according to the dynamic gate range by each group, and transmitting the ultrasonic C scanning amplitude value to an ultrasonic C scanning display module through a UDP mode of a Socket;

(8) Storing ultrasonic A scanning radio frequency data into an HDF5 file;

(9) Updating the waveform of the ultrasonic A scanning display area;

(10) Repeating the step (1).

(5) After the ultrasonic A scanning display module is initialized, a Socket is created, and a local IP and a port number of the Socket are set;

(6) The ultrasonic A scanning display module enters a blocking state to wait for data;

(7) The ultrasonic A scanning display module receives the data transmitted by the ultrasonic C scanning display module and transmits return data to the ultrasonic C scanning display module;

(8) And (5) ending data transmission of the ultrasonic A scanning display module and the ultrasonic C scanning display module, and closing the Socket.

(4) Creating a Socket after initializing the ultrasonic C scanning display module;

(5) The ultrasonic C scanning display module is connected with the ultrasonic A scanning display module and then transmits data to receive return data;

(6) And (5) ending data transmission of the ultrasonic A scanning display module and the ultrasonic C scanning display module, and closing the Socket.

(6) After the main control module is initialized, a Socket is created, and a local IP and a port number of the Socket are set;

(7) The master control module starts monitoring connection;

(8) The main control module enters a blocking state and continuously receives a connection request of the ultrasonic C scanning display module;

(9) The main control module receives data transmitted by the ultrasonic C scanning display module and transmits the data to the ultrasonic C scanning display module to return the data;

(10) And after the transmission of the main control module and the ultrasonic C scanning display module is finished, closing the Socket.

(4) After the ultrasonic C scanning display module is initialized, a Socket is created and connected with the IP and the port number address of the main control module;

(5) After the TCP connection between the ultrasonic C scanning display module and the main control module is successful, sending data and receiving returned data;

(6) And after the transmission of the main control module and the ultrasonic C scanning display module is finished, closing the Socket.

TABLE 1 command signal resolution

The embodiment provides a detection system capable of detecting ten-micron-sized micro defects in a raceway working layer of an aviation bearing ring, and detection and evaluation capability of the working layer (the most critical area in the ring) in the aviation bearing ring is greatly improved. The detection system is high in automation degree, and can meet the requirements of higher detection efficiency in the bearing manufacturing stage and the in-service detection stage while ensuring the detection precision.

Compared with the prior art, the ultrasonic detection system provided by the embodiment can carry out scanning from the side of the working layer of the small-curvature rollaway nest, and can effectively detect and evaluate micro defects of ten micrometers of the working layer by adopting ultrasonic waves of up to 150 MHz.

Claims

1. An ultrasonic detection system for micro defects of an aviation bearing ring raceway working layer is characterized in that: the ultrasonic detection system for the micro defects of the working layer of the raceway of the aviation bearing ring meets the following requirements:

the ultrasonic probe comprises a micro-swing-angle ultrasonic scanning unit (1), wherein the micro-swing-angle ultrasonic scanning unit (1) is provided with a structure capable of enabling the ultrasonic probe to perform fine geometric scanning with a scanning resolution of as small as 0.01mm along a small-curvature raceway cambered surface with a curvature radius of as small as 11mm, and the structure is provided with a constitution unit capable of emitting high-frequency ultrasonic waves with a frequency of as high as 150 MHz.

2. An ultrasonic detection system for micro defects of an aviation bearing ring raceway working layer according to claim 1, characterized in that: the ultrasonic detection system for the micro defects of the working layer of the raceway of the aviation bearing ring comprises the following components: the device comprises a micro swing angle ultrasonic scanning unit (1), a signal acquisition processing unit, an electric control and motion control unit (3), a high-frequency transmitting and receiving module (4) and an upper computer (5); wherein: the upper computer (5) comprises a data acquisition card (5.1) and an upper computer controller (5.2); the upper computer controller (5.2) is connected with the micro-swing-angle ultrasonic scanning unit (1) through the electric control and motion control unit (3); the micro-swing-angle ultrasonic scanning unit (1) is connected with the data acquisition card (5.1) through the high-frequency transmitting and receiving module (4), and the micro-swing-angle ultrasonic scanning unit (1) is also connected with the upper computer controller (5.2) through the data acquisition card (5.1); wherein:

The micro-swing-angle ultrasonic scanning unit (1) consists of a micro-swing-angle mechanism assembly (1.1), a plane triaxial module (1.2), a bearing clamping and rotating assembly (1.3), a base frame (1.4) and a water tank (1.5); wherein:

the base body frame (1.4) is provided with an integrally processed plane triaxial module (1.2) and a mounting plane of the bearing clamping and rotating assembly (1.3), and the parallelism of the plane triaxial module, the mounting plane and the bearing clamping and rotating assembly is required to be within a range of +/-0.02 mm; the plane triaxial module (1.2) adopts a gantry structure and consists of an X-axis unit (1.2.1), a Y-axis unit (1.2.2) and a Z-axis unit (1.2.3); the single axis unit, namely the X axis unit (1.2.1) or the Y axis unit (1.2.2) or the Z axis unit (1.2.3), adopts a ball screw structure, and the repeated positioning precision is required to be within the range of +/-0.05 mm;

the miniature swing angle mechanism assembly (1.1) consists of a circumference angle action unit (1.1.1) and a vertical angle action unit (1.1.2); the miniature swing angle mechanism assembly (1.1) is connected to a sliding block of the Z-axis unit (1.2.3) through a transition flange (1.1.1 c);

the circumference angle action unit (1.1.1) consists of a circumference driving motor (1.1.1 a) and a hollow rotary table (1.1.1 b); the hollow rotary table (1.1.1b) is fixed on the transition flange (1.1.1c), and is further connected with a circumference driving motor (1.1.1a), and the circumference driving motor (1.1.1a) drives the hollow rotary table (1.1.1b) to rotate;

The rotating part of the hollow rotating platform (1.1.1b) is connected with the upper surface of the motor mounting frame (1.1.2a) of the vertical angle action unit (1.1.2) through the matching surface in a threaded way;

the vertical angle action unit (1.1.2) consists of a motor mounting frame (1.1.2 a), a vertical angle driving motor (1.1.2B), a connecting sleeve (1.1.2 c), a quincuncial jackscrew coupler (1.1.2 d), a B angle transmission shaft (1.1.2 e), a miniature corner device (1.1.2 f), a probe frame (1.1.2 g) and a probe (1.1.2 h); the vertical angle driving motor (1.1.2B) drives the vertical shaft of the miniature corner device (1.1.2 f) to rotate through the plum blossom type jackscrew type shaft coupling (1.1.2 d) and the B angle driving shaft (1.1.2 e) in sequence; the miniature corner device (1.1.2 f) is of a bevel gear structure and drives the probe frame (1.1.2 g) to realize angle swing in the vertical direction; the probe (1.1.2 h) is a high-frequency ultrasonic probe focused by water immersion, the size diameter of the shell of the probe (1.1.2 h) is smaller than 12.5mm, the focal distance in water is larger than 8mm, and the focal diameter range is 0.3mm-1mm;

the bearing clamping and rotating assembly 1.3 consists of three parts: a rotary driving unit (1.3.1), a rotary sealing and transmission unit (1.3.2) and a bearing clamping unit (1.3.3);

the rotary seal and transmission unit (1.3.2) comprises: transmission shaft A (1.3.2 a), inner and outer ring integrated RU type crossed roller bearings (1.3.2B), 109 series sealing rings (1.3.2 c), a reference flange seat (1.3.2 d) and transmission shaft B (1.3.2 f);

The rotary drive unit (1.3.1) comprises: a rotary driving motor (1.3.1 a), a suspension motor mounting seat (1.3.1 b) and a coupler (1.3.1 c);

the bearing clamping unit (1.3.3) comprises a chuck mounting reference base (1.3.3 a), a chuck (1.3.3 b) and a claw (1.3.3 c);

the connection modes among the three units forming the bearing clamping rotary assembly (1.3), namely the rotary driving unit (1.3.1), the rotary sealing and transmission unit (1.3.2) and the bearing clamping unit (1.3.3) meet the following requirements:

the rotary sealing and transmission unit (1.3.2) is fixed on the bottom surface of the water tank (1.5); the fixing mode is that the standard flange seat (1.3.2 d) falls on a round mounting surface of the water tank (1.5), waterproof glue is paved on the mounting surface, the waterproof glue is fixed on the bottom surface of the water tank (1.5) from top to bottom by adopting screws, and a threaded hole on the bottom surface of the water tank (1.5) does not penetrate through the bottom surface of the water tank (1.5);

secondly, the rotary driving unit (1.3.1) is fixed on the rotary sealing and transmission unit (1.3.2); the fixing mode is as follows: connecting a suspension motor mounting seat (1.3.1b) with a reference flange seat (1.3.2d) from bottom to top through threads; an output shaft of a rotary driving motor (1.3.1 a) in the rotary driving unit (1.3.1) is connected with the lower end of a transmission shaft B (1.3.2 f) through a coupler (1.3.1 c);

And thirdly, the bearing clamping unit (1.3.3) is connected with the upper end of the transmission shaft B (1.3.2 f) through a key slot.

3. An aeronautical bearing ring raceway working layer micro defect ultrasonic detection system according to claim 2 and wherein: the ultrasonic detection system for the micro defects of the working layer of the raceway of the aviation bearing ring meets one or a combination of the following requirements:

the first signal acquisition processing unit includes: an encoder and an AD analog-to-digital acquisition card;

secondly, the signal acquisition processing unit meets the following requirements: the PCIe bus connects the high-speed data acquisition card with the upper computer;

thirdly, the ultrasonic A scanning signal acquisition unit is a functional unit structure with a motion scanning mode of an automatic acquisition mode and a local acquisition mode.

4. An ultrasonic detection system for micro defects of an aviation bearing ring raceway working layer according to one of claims 1 to 3, characterized in that: the ultrasonic detection system for the micro defects of the working layer of the raceway of the aviation bearing ring meets one or a combination of the following requirements:

first, the electric control and motion control unit (3) comprises: a power control module and a motion control module;

The motion control module uses an MPC08E type motion control card, which comprises: the PCI interface comprises a motion control card, a driver, an incoming line filter and a motor; the motion control card is arranged in the industrial personal computer and is connected with the industrial personal computer through a PCI bus;

the MPC08E type motion control card is a core device for controlling the rotation of a servo motor, is arranged in an industrial personal computer and realizes two-way communication with the industrial personal computer through a PCI bus;

secondly, the model of the high-frequency transmitting and receiving module (4) is UT340, the transmitter index meets the excitation voltage of 100V to 500V, the rising edge and the falling edge of the excitation pulse are smaller than 2ns, the excitation pulse width is 5.0ns to 80ns, and the repetition frequency range is 200-20kHz; the receiver index should meet the bandwidth of 1MHz-150MHz; the system also has a real-time A-scanning analog signal output interface;

thirdly, the upper computer controller (5.2) of the upper computer (5) is of a Hua 610L series, is provided with an i7 processor, a memory 16G and a hard disk 1T, and is provided with at least two PCI/PCIe interfaces.