Automated Device and Usage Method for Magnetic Saturation Eddy Current Detection of Subsurface Defects in Bearing Rings

Abstract

Automated device and method for magnetic saturation eddy current detection of subsurface defects of bearing rings, relating to the technical field of bearing detection. To solve the problems that existing detection devices cannot detect magnetic bearings, since the magnetic permeability of ferromagnetic materials is much greater than one, eddy currents can only concentrate on the detection surface and cannot penetrate into the interior of the material, and the magnetic saturator in existing detection devices is large in volume, resulting in immobility and inconvenience in use. By adding a magnetic saturation unit based on the principle of Helmholtz coils, this kind of magnetic saturation unit is small in volume, avoiding the disadvantages of traditional magnetic saturators such as large volume, heavy weight and immobility, and can generate a uniform magnetic field inside it, causing the bearing rings to be detected inside to reach magnetic saturation, enabling the eddy currents generated by the detection probe to penetrate into the subsurface of the bearing rings. Then, the driving device is used to drive the bearing under test to rotate uniformly, realizing accurate detection of subsurface defects of the bearing rings and facilitating operation. The present invention is applicable to the field of bearing detection.

Description

Technical Field

[0001] The present invention relates to the technical field of bearing detection, and in particular to an automatic device and a use method for magnetic saturation eddy current detection of subsurface defects of bearing rings. Background Art

[0002] Bearings are one of the essential and important components in aeroengines, and their importance is extremely great. With the rapid development of the manufacturing level of aeroengines in China, the demand and output of bearings are increasing day by day. As a key component of aeroengines, the quality of bearings directly determines the performance and stability of equipment and products. Therefore, the quality of bearings is particularly important.

[0003] During the processing of metal bearing rings, due to reasons such as continuous casting billets, cutting and grinding, different types of defects such as cracks, cavities, forging waste, and scratches are easily formed on the surface of the rings during the processing. On the one hand, these defects affect the appearance of the product, and on the other hand, they reduce the physical properties of the product, leaving potential safety hazards for mechanical products, resulting in the generation of larger cracks or even fracture failures in the bearing rings during service, seriously affecting the service performance. Therefore, for bearing rings with defective appearances, they must be removed before entering the next process to reduce subsequent man-hours and material waste.

[0004] Conventional eddy current flaw detection can not only detect defects, but also analyze the location and depth of the defects using impedance plane technology. At the same time, since eddy current detection is based on electromagnetic induction, the probe coil does not need to contact the test piece, so the detection speed is relatively fast, and it is easy to realize automatic detection. Moreover, eddy current detection has high sensitivity to defects on the surface and near the surface of workpieces.

[0005] Most of the existing eddy current detection devices are for non-ferromagnetic materials, and their detection accuracy is relatively high. However, for the detection of ferromagnetic materials used in bearing rings, since the magnetic permeability of ferromagnetic materials is much greater than one, eddy currents can only be concentrated on the detection surface and cannot penetrate into the interior of the materials. In addition, the magnetic domain structure of ferromagnetic materials will also greatly interfere with the eddy current detection signal, enough to completely submerge the defect signal and unable to obtain the eddy current detection test result. At the same time, traditional magnetic saturators have disadvantages such as large volume, heavy weight, and inability to move.

[0006] In summary, the existing detection devices cannot detect bearings with magnetism. Due to the fact that the magnetic permeability of ferromagnetic materials is much greater than one, eddy currents can only be concentrated on the detection surface and cannot penetrate into the interior of the materials. Moreover, the magnetic saturator in the existing detection device has a relatively large volume, resulting in inability to move and inconvenience in use. Summary of the Invention

[0007] The present invention aims to solve the problems that existing detection devices cannot detect those with magnetic bearings. Since the magnetic permeability of ferromagnetic materials is much greater than one, eddy currents can only concentrate on the detection surface and cannot penetrate into the interior of the material. Moreover, the magnetic saturator in existing detection devices is relatively large in volume, resulting in immobility and inconvenience in use. Therefore, an automatic device and method for magnetic saturation eddy current detection of subsurface defects in bearing rings are proposed.

[0008] An automatic device for magnetic saturation eddy current detection of subsurface defects in bearing rings according to the present invention comprises a mobile detection unit, a magnetic saturation unit, a driving unit, centering claws, and a workbench.

[0009] The workbench includes side plates, positioning installation grooves, support blocks, and a top plate. On both sides of the upper surface of the top plate, there is respectively a support block. Along the circumferential direction of the upper surface of the top plate, n positioning installation grooves are evenly arranged, where n is a positive integer. On both sides of the lower surface of the top plate, there is respectively a side plate, and a bottom plate is provided between the two side plates.

[0010] One side of the lower surface of the mobile detection unit is fixedly connected to the upper surface of the support block on one side of the upper surface of the top plate, and the other side of the lower surface of the mobile detection unit is fixedly connected to the upper surface of the support block on the other side of the upper surface of the top plate. In the center of the upper surface of the top plate, there is a magnetic saturation unit. Each positioning installation groove on the top plate is equipped with a centering claw. On the upper surface of the bottom plate of the workbench, there is a driving unit, and the output end of the driving unit passes through the top plate, and the end face of the output end of the driving unit is on the same horizontal plane as the upper surface of the top plate.

[0011] Further, the number n of the positioning installation grooves, n = 3 or 4.

[0012] Further, the mobile detection unit includes an XYZ three-axis moving platform, an L-shaped detection probe, a mounting plate, and a probe mounting block. On the lower part of the front side of the moving head of the XYZ three-axis moving platform, there is a mounting plate, and in the center of the front side of the mounting plate, it is fixedly connected to the top end of the L-shaped detection probe through the probe mounting block.

[0013] Further, the magnetic saturation unit includes two magnetic saturation devices and two support columns. The two magnetic saturation devices are arranged in parallel, and between the lower surface of one end of one magnetic saturation device and the upper surface of one end of the other magnetic saturation device, there is a support column. Between the lower surface of the other end of one magnetic saturation device and the upper surface of the other end of the other magnetic saturation device, there is another support column.

[0014] The magnetic saturation device includes two fixed frames, an annular plate, and a conductor coil. The two fixed frames are arranged oppositely, and on the opposite surfaces of the two fixed frames, there is respectively an arc-shaped groove. Between the arc-shaped grooves on the opposite surfaces of the two fixed frames, there is an annular plate, and the upper surface of the annular plate is fixedly connected to the fixed frame through bolts. A conductor coil is sleeved on the outer surface of the annular plate.

[0015] Further, both fixing brackets of the lower magnetic saturation device of the magnetic saturation unit are fixedly connected to the top plate of the workbench through bolts;

[0016] Further, the driving unit includes a rotating disc, a transmission shaft, a planetary reducer, a motor bracket and a motor;

[0017] At the center of the upper surface of the bottom plate of the workbench, there is a motor bracket. A motor is provided on the motor bracket. The output end of the motor is connected to the input end of the planetary reducer. The output end of the planetary reducer is connected to one end of the transmission shaft through a coupling. The other end of the transmission shaft is fixedly connected to the middle of the lower surface of the rotating disc. A plurality of fixing bolts are arranged on the upper surface of the rotating disc along the circumferential direction;

[0018] Further, the centering claw includes a base, a vertical plate, a pin shaft, a roller, a support plate, a slider, a pin, a lead screw and a driving motor;

[0019] On both sides of the upper surface of the base, there is a vertical plate respectively. A through hole is provided in the middle of the side surface of each vertical plate. A lead screw is arranged between the two vertical plates. The end surface of the lead screw is rotationally connected to the through hole on the vertical plate. On the other side of the vertical plate at one end of the base, a driving motor is fixed. The output end of the driving motor is connected to one end of the lead screw through a coupling. A slider is arranged on the lead screw. A support plate is arranged on the upper surface of the slider. One end of the upper surface of the support plate is fixedly connected to the upper surface of the slider through a pin. A through hole is provided at the other end of the upper surface of the support plate. A pin shaft is arranged inside the through hole. A roller is arranged on the pin shaft;

[0020] Further, a bearing is arranged between the outer surface of the lead screw and the inner wall of the through hole on the vertical plate;

[0021] A method for using the automatic device for magnetic saturation eddy current detection of subsurface defects of bearing rings of the present invention is as follows:

[0022] Step 1: Centering adjustment of the bearing ring;

[0023] First, place the bearing ring to be detected at the center of the rotating disc. Use three groups of centering claws. The driving motor of each group drives the lead screw to rotate. Control the slider by the rotation of the lead screw and move towards the center of the top plate of the workbench at the same time. The slider drives the support plate and the roller to move horizontally and move towards the positioning center together until the roller contacts the outer ring of the bearing ring to be detected, so that the circular plate of the magnetic saturation unit is concentric with the bearing ring to be detected;

[0024] Step 2: Action of uniform magnetic field under rotational motion

[0025] Energize the conductor coil of the magnetic saturation unit, causing a uniform magnetic field to be generated inside the magnetic saturation unit. At the same time, control the driving device to drive the servo motor to rotate, and the rotating disc drives the bearing race to be detected to perform a rotational motion.

[0026] Step 3: Eddy current detection of subsurface defects

[0027] The XYZ three-axis moving platform in the mobile detection device controls the L-shaped detection probe to extend into the bearing race. The end of the L-shaped detection probe is close to the inner wall of the bearing race to be detected. As the bearing race to be detected rotates, the L-shaped detection probe performs circumferential eddy current scanning detection. The XYZ three-axis moving platform controls the up and down movement of the L-shaped detection probe to perform a comprehensive detection of the inner wall of the bearing race. After the detection is completed, the L-shaped detection probe rises and resets, thus completing the detection operation of the bearing.

[0028] The present invention has the following beneficial effects compared with the prior art:

[0029] The present invention overcomes the shortcomings of the prior art. By adding a magnetic saturation unit based on the principle of Helmholtz coils, this magnetic saturation unit is small in volume, avoiding the disadvantages of large volume, heavy weight, and immobility of traditional magnetic saturators. It can generate a uniform magnetic field inside, causing the bearing race to be detected inside it to reach magnetic saturation, enabling the eddy current generated by the detection probe to penetrate into the subsurface of the bearing race. Then, the driving device drives the bearing to be measured to rotate at a constant speed, thereby realizing the accurate detection of subsurface defects of the bearing race and being easy to operate. At the same time, the present invention can replace manual labor to complete the automated detection process of subsurface defects of the bearing race. It not only reduces the labor intensity and cost of manual labor, but also improves the detection accuracy and efficiency, and has great application prospects. Brief description of the drawings

[0030] Figure 1 is a three-dimensional schematic diagram of an automated device for magnetic saturation eddy current detection of subsurface defects of a bearing race according to the present invention;

[0031] Figure 2 is a three-dimensional schematic diagram of the mobile detection unit in an automated device for magnetic saturation eddy current detection of subsurface defects of a bearing race according to the present invention;

[0032] Figure 3 is a three-dimensional schematic diagram of the magnetic saturation unit in an automated device for magnetic saturation eddy current detection of subsurface defects of a bearing race according to the present invention;

[0033] Figure 4 is a three-dimensional schematic diagram of the driving unit in an automated device for magnetic saturation eddy current detection of subsurface defects of a bearing race according to the present invention;

[0034] Figure 5It is a three-dimensional schematic diagram of the centering claw in the magnetic saturation eddy current detection automation device for subsurface defects of a bearing ring described in the present invention. Detailed implementation manners

[0035] Detailed implementation manner one: In combination with Figure 1 This detailed implementation manner is described. An automated device for magnetic saturation eddy current detection of subsurface defects of a bearing ring described in this detailed implementation manner includes a mobile detection unit 1, a magnetic saturation unit 2, a driving unit 3, a centering claw 4, and a workbench 5;

[0036] The workbench 5 includes side plates 5001, positioning and installation grooves 5002, support blocks 5003, and a top plate 5004; on both sides of the upper surface of the top plate 5004, there is a support block 5003 respectively. Along the circumferential direction of the upper surface of the top plate 5004, n positioning and installation grooves 5002 are evenly arranged, where n is a positive integer. On both sides of the lower surface of the top plate 5004, there is a side plate 5001 respectively, and there is a bottom plate between the two side plates 5001;

[0037] One side of the lower surface of the mobile detection unit 1 is fixedly connected to the upper surface of the support block 5003 on one side of the upper surface of the top plate 5004, and the other side of the lower surface of the mobile detection unit 1 is fixedly connected to the upper surface of the support block 5003 on the other side of the upper surface of the top plate 5004. And in the center of the upper surface of the top plate 5004, there is a magnetic saturation unit 2. Each positioning and installation groove 5002 on the top plate 5004 is provided with a centering claw 4. On the upper surface of the bottom plate of the workbench 5, there is a driving unit 3, and the output end of the driving unit 3 passes through the top plate 5004, and the end face of the output end of the driving unit 3 is on the same horizontal plane as the upper surface of the top plate 5004;

[0038] In this specific implementation manner, by adding a magnetic saturation unit based on the Helmholtz coil principle, this kind of magnetic saturation unit has a small volume, avoiding the disadvantages of traditional magnetic saturators such as large volume, heavy weight, and inability to move. It can generate a uniform magnetic field inside, causing the bearing ring to be detected inside to reach magnetic saturation, enabling the eddy current generated by the detection probe to penetrate into the subsurface of the bearing ring. Then, using the driving device to drive the bearing under test to rotate at a constant speed, thereby realizing accurate detection of subsurface defects of the bearing ring and facilitating operation. At the same time, the present invention can replace manual labor to complete the automated detection process of subsurface defects of bearing rings, not only reducing the labor intensity and cost of manual labor, but also improving the detection accuracy and efficiency, and having great application prospects.

[0039] Detailed implementation manner two: In combination with Figure 1 This detailed implementation manner is described. This detailed implementation manner is a further limitation on the detection device described in detailed implementation manner one. For an automated device for magnetic saturation eddy current detection of subsurface defects of a bearing ring described in this detailed implementation manner, the number n of the positioning and installation grooves 5002, n = 3 or 4;

[0040] In this specific implementation, the number n of the positioning installation grooves 5002 is used, where n = 3 or 4. When the number n of the positioning installation grooves 5002 is 3, three centering claws 4 are provided in the device, and the angle between every two centering claws 4 is 120°, realizing the precise positioning of the measured bearing ring 6, and further ensuring the concentricity of the bearing ring 6 and the magnetic saturation unit 2.

[0041] Specific implementation method three: Combined with Figure 2 Describe this implementation method. This implementation method is a further limitation on the detection device described in the first specific implementation method. For an automatic magnetic saturation eddy current detection device for subsurface defects of bearing rings described in this implementation method, the moving detection unit 1 includes an XYZ three-axis moving platform 1001, an L-shaped detection probe 1002, a mounting plate 1003, and a probe mounting block 1004; a mounting plate 1003 is provided at the lower part of the front surface of the moving head of the XYZ three-axis moving platform 1001, and the center of the front surface of the mounting plate 1003 is fixedly connected to the top end of the L-shaped detection probe 1002 through the probe mounting block 1004;

[0042] In this specific implementation method, since the XYZ three-axis moving platform 1001 has good displacement control accuracy, it is widely used and can realize the precise movement of the L-shaped detection probe 1002 in the three spatial directions of X, Y, and Z, improving the detection accuracy of the detection device.

[0043] Specific implementation method four: Combined with Figure 3 Describe this implementation method. This implementation method is a further limitation on the detection device described in the first specific implementation method. For an automatic magnetic saturation eddy current detection device for subsurface defects of bearing rings described in this implementation method, the magnetic saturation unit 2 includes two magnetic saturation devices and two support columns 2004; the two magnetic saturation devices are arranged in parallel, and a support column 2004 is provided between the lower surface of one end of one magnetic saturation device and the upper surface of one end of the other magnetic saturation device, and another support column 2004 is provided between the lower surface of the other end of one magnetic saturation device and the upper surface of the other end of the other magnetic saturation device;

[0044] The magnetic saturation device includes two fixing frames 2003, a circular ring plate 2001, and a conductor coil 2002; the two fixing frames 2003 are arranged opposite to each other, and an arc-shaped groove is provided on each of the opposite surfaces of the two fixing frames 2003, and a circular ring plate 2001 is provided between the arc-shaped grooves on the opposite surfaces of the two fixing frames 2003, and the upper surface of the circular ring plate 2001 is fixedly connected to the fixing frame 2003 through bolts, and a conductor coil 2002 is sleeved on the outer surface of the circular ring plate 2001;

[0045] In this specific embodiment, since the current directions of the conductor coils 2002 are the same and the magnitudes are the same, and the distance d between the centers of the conductor coils 2002 in the upper and lower parts is equal to the distance r between the two circular plates 2001, meeting the conditions of a Helmholtz coil, a uniform magnetic field can be generated inside the magnetic saturation unit 2, causing the bearing race 6 at the center inside the magnetic saturation unit 2 to be gradually magnetized and then reach magnetic saturation. The bearing race 6 is made of a ferromagnetic material with a magnetic permeability much greater than one. As a result, when eddy current testing is performed on the bearing race 6 using the L-shaped detection probe 1002, the eddy current can only be concentrated on the subsurface of the bearing race 6 and cannot penetrate into the interior of the material. At the same time, the magnetic domain structure of the ferromagnetic material also greatly interferes with the eddy current detection signal, sufficient to completely submerge the defect signal and make it impossible to measure. By adding the magnetic saturation unit 2, the bearing race 6 can be magnetized until magnetic saturation, enabling the ferromagnetic material to be treated as a non-ferromagnetic material, thereby accurately detecting subsurface defects and the location and depth of the defects through eddy current testing.

[0046] Specific Embodiment 5: Combining Figure 1 and Figure 3 to describe this embodiment. This embodiment further limits the detection device described in Specific Embodiment 4. For an automatic device for magnetic saturation eddy current detection of subsurface defects of a bearing race, both fixing brackets 2003 of the magnetic saturation device at the lower part of the magnetic saturation unit 2 are fixedly connected to the top plate 5004 of the workbench 5 by bolts;

[0047] In this specific embodiment, both fixing brackets 2003 of the magnetic saturation device at the lower part of the magnetic saturation unit 2 are fixedly connected to the top plate 5004 of the workbench 5 by bolts, improving the stability of the device.

[0048] Specific Embodiment 6: Combining Figure 4 to describe this embodiment. This embodiment further limits the detection device described in Specific Embodiment 1. For an automatic device for magnetic saturation eddy current detection of subsurface defects of a bearing race, the driving unit 3 includes a rotating disc 3002, a transmission shaft 3003, a planetary reducer 3004, a motor bracket 3005, and a motor 3006;

[0049] At the center of the upper surface of the bottom plate of the workbench 5, there is a motor bracket 3005. A motor 3006 is provided on the motor bracket 3005. The output end of the motor 3006 is connected to the input end of the planetary reducer 3004. The output end of the planetary reducer 3004 is connected to one end of the transmission shaft 3003 through a coupling. The other end of the transmission shaft 3003 is fixedly connected to the middle part of the lower surface of the rotating disc 3002. A plurality of fixing bolts 3001 are provided on the upper surface of the rotating disc 3002 along the circumferential direction.

[0050] Specific Embodiment 7: CombiningFigure 5 Regarding this embodiment, this embodiment further defines the detection device described in the first specific embodiment. For an automatic magnetic saturation eddy current detection device for subsurface defects of bearing rings described in this embodiment, the centering claw 4 includes a base, a vertical plate, a pin shaft 4001, a roller 4002, a support plate 4003, a slider 4004, a pin 4005, a lead screw 4006, and a driving motor 4007;

[0051] On both sides of the upper surface of the base, a vertical plate is respectively provided. In the middle of the side surface of each vertical plate, a through hole is provided, and a lead screw 4006 is provided between the two vertical plates. The end surface of the lead screw 4006 is rotationally connected to the through hole on the vertical plate. On the other side of one end vertical plate of the base, a driving motor 4007 is fixed, and the output end of the driving motor 4007 is connected to one end of the lead screw 4006 through a coupling. A slider 4004 is provided on the lead screw 4006. A support plate 4003 is provided on the upper surface of the slider 4004, and one end of the upper surface of the support plate 4003 is fixedly connected to the upper surface of the slider 4004 through a pin 4005. A through hole is provided at the other end of the upper surface of the support plate 4003, and a pin shaft 4001 is provided inside the through hole, and a roller 4002 is provided on the pin shaft 4001;

[0052] In this specific embodiment, when in use, by using three groups of centering claws 4, the driving motor 4007 of each group drives the lead screw 4006 to rotate. The lead screw 4006 drives the slider 4004 to perform a linear motion. The slider 4004 drives the support plate 4003 and the roller 4002 to move towards the positioning center. The circumferential surface of the roller 4002 is in contact with the outer surface of the bearing ring 6. While the bearing ring 6 is rotating, the roller 4002 can rotate accordingly, avoiding the generation of additional loads and contact scratches.

[0053] Specific embodiment eight: Combining Figure 5 Regarding this embodiment, this embodiment further defines the detection device described in the seventh specific embodiment. For an automatic magnetic saturation eddy current detection device for subsurface defects of bearing rings described in this embodiment, a bearing is provided between the outer surface of the lead screw 4006 and the inner wall of the through hole on the vertical plate.

[0054] Specific embodiment nine: Combining Figure 1 Regarding the usage method of an automatic magnetic saturation eddy current detection device for subsurface defects of bearing rings described in this embodiment, the specific method is as follows:

[0055] Step one: Centering adjustment of the bearing ring;

[0056] First, place the bearing ring 6 to be detected at the center of the rotating disc 3002. Use three sets of centering claws 4. The driving motor 4007 of each set drives the lead screw 4006 to rotate. Control the slider 4004 by the rotation of the lead screw 4006 and move it towards the center of the top plate 5004 of the workbench 5 at the same time. The slider 4004 drives the support plate 4003 and the roller 4002 to move horizontally and jointly move towards the positioning center until the roller 4002 contacts the outer ring of the bearing ring 6 to be detected, so that the circular plate 2001 of the magnetic saturation unit 2 is concentric with the bearing ring 6 to be detected;

[0057] Step 2: Action of uniform magnetic field under rotational motion

[0058] Energize the conductor coil 2002 of the magnetic saturation unit 2, causing a uniform magnetic field to be generated inside the magnetic saturation unit 2. At the same time, control the driving device 3 to drive the servo motor 3006 to rotate, and the rotating disc 3002 drives the bearing ring 6 to be detected to perform a rotational motion;

[0059] Step 3: Eddy current detection of subsurface defects

[0060] The XYZ three-axis moving platform 1001 in the mobile detection device 1 controls the L-shaped detection probe 1002 to extend into the bearing ring 6, so that the end of the L-shaped detection probe 1002 is close to the inner wall of the bearing ring 6 to be detected. As the bearing ring 6 to be detected rotates, the L-shaped detection probe 1002 performs circumferential eddy current scanning detection. By controlling the up and down movement of the L-shaped detection probe 1002 through the XYZ three-axis moving platform 1001, the entire inner wall of the bearing ring 6 can be detected. After the detection is completed, the L-shaped detection probe 1002 rises and resets, thus completing the detection operation of the bearing.

Claims

1. An automated device for magnetic saturation eddy current detection of subsurface defects in bearing rings, characterized in that: It includes a movement detection unit (1), a magnetic saturation unit (2), a driving unit (3), centering claws (4) and a workbench (5); The workbench (5) includes side plates (5001), support blocks (5003) and a top plate (5004); there is one support block (5003) respectively on both sides of the upper surface of the top plate (5004), the upper surface of the top plate (5004) is evenly provided with n positioning and mounting grooves (5002) along the circumferential direction, n is a positive integer, there is one side plate (5001) respectively on both sides of the lower surface of the top plate (5004), and a bottom plate is provided between the two side plates (5001); One side of the lower surface of the movement detection unit (1) is fixedly connected to the upper surface of the support block (5003) on one side of the upper surface of the top plate (5004), the other side of the lower surface of the movement detection unit (1) is fixedly connected to the upper surface of the support block (5003) on the other side of the upper surface of the top plate (5004), and a magnetic saturation unit (2) is provided at the center of the upper surface of the top plate (5004), a centering claw (4) is installed in each positioning and mounting groove (5002) on the top plate (5004), the driving unit (3) is provided on the upper surface of the bottom plate of the workbench (5), and the output end of the driving unit (3) passes through the top plate (5004), and the end face of the output end of the driving unit (3) is on the same horizontal plane as the upper surface of the top plate (5004); The magnetic saturation unit (2) includes two magnetic saturation devices and two support columns (2004); the two magnetic saturation devices are arranged in parallel, and there is one support column (2004) between the lower surface of one end of one magnetic saturation device and the upper surface of one end of the other magnetic saturation device, and there is the other support column (2004) between the lower surface of the other end of one magnetic saturation device and the upper surface of the other end of the other magnetic saturation device; The magnetic saturation device includes two fixing frames (2003), an annular plate (2001) and a conductor coil (2002); the two fixing frames (2003) are arranged oppositely, and there is one arc-shaped groove respectively on the opposite surfaces of the two fixing frames (2003), and an annular plate (2001) is provided between the arc-shaped grooves on the opposite surfaces of the two fixing frames (2003), and the upper surface of the annular plate (2001) is fixedly connected to the fixing frame (2003) by bolts, a conductor coil (2002) is sleeved on the outer surface of the annular plate (2001), and the center-to-center distance d of the conductor coils (2002) is equal to the distance r between the two annular plates (2001).

2. The magnetic saturation eddy current detection automation device for the subsurface defects of the bearing ring according to claim 1, wherein: The number n of the positioning and mounting grooves (5002) is n = 3 or 4.

3. The magnetic saturation eddy current detection automation device for the subsurface defects of the bearing ring according to claim 1 or 2, characterized in that: The movement detection unit (1) includes an XYZ three-axis movement platform (1001), an L-shaped detection probe (1002), a mounting plate (1003) and a probe mounting block (1004); a mounting plate (1003) is provided at the lower part of the front of the moving head of the XYZ three-axis movement platform (1001), and the top end of the L-shaped detection probe (1002) is fixedly connected to the center of the front of the mounting plate (1003) through the probe mounting block (1004).

4. The automatic device for magnetic saturation eddy current detection of subsurface defects of bearing rings according to claim 1, wherein: The described driving unit (3) includes a rotating disc (3002), a transmission shaft (3003), a planetary reducer (3004), a motor bracket (3005), and a motor (3006); At the center of the upper surface of the bottom plate of the described workbench (5), there is a motor bracket (3005). A motor (3006) is provided on the motor bracket (3005). The output end of the motor (3006) is connected to the input end of the planetary reducer (3004). The output end of the planetary reducer (3004) is connected to one end of the transmission shaft (3003) through a coupling. The other end of the transmission shaft (3003) is fixedly connected to the middle of the lower surface of the rotating disc (3002). A plurality of fixing bolts (3001) are provided on the upper surface of the rotating disc (3002) along the circumferential direction.

5. The automatic device for magnetic saturation eddy current detection of subsurface defects of bearing rings according to claim 1, characterized in that: The described centering claw (4) includes a base, a vertical plate, a pin shaft (4001), a roller (4002), a support plate (4003), a slider (4004), a pin (4005), a lead screw (4006), and a driving motor (4007); On both sides of the upper surface of the base, there is a vertical plate respectively. A through hole is provided in the middle of the side surface of each vertical plate. A lead screw (4006) is provided between the two vertical plates. The end face of the lead screw (4006) is rotatably connected to the through hole on the vertical plate. On the other side of one of the vertical plates at one end of the base, a driving motor (4007) is fixed. The output end of the driving motor (4007) is connected to one end of the lead screw (4006) through a coupling. A slider (4004) is provided on the lead screw (4006). A support plate (4003) is provided on the upper surface of the slider (4004). One end of the upper surface of the support plate (4003) is fixedly connected to the upper surface of the slider (4004) through a pin (4005). A through hole is provided at the other end of the upper surface of the support plate (4003). A pin shaft (4001) is provided inside the through hole. A roller (4002) is provided on the pin shaft (4001).

6. The magnetic saturation eddy current detection automation device for subsurface defects of bearing rings according to claim 5, characterized in that: Between the outer surface of the described lead screw (4006) and the inner wall of the through hole on the vertical plate, there is a bearing.

7. The method of using the automatic device for magnetic saturation eddy current detection of subsurface defects of bearing rings according to any one of claims 1 to 6, characterized in that: The specific method is as follows: Step 1: Centering adjustment of the bearing ring; First, place the bearing ring (6) to be detected at the center of the rotating disc (3002). Using three groups of centering claws (4), the driving motor (4007) of each group drives the lead screw (4006) to rotate. By using the rotation of the lead screw (4006) to control the slider (4004), and at the same time move towards the center of the top plate (5004) of the workbench (5). The slider (4004) drives the support plate (4003) and the roller (4002) to move horizontally, and move towards the positioning center together until the roller (4002) contacts the outer ring of the bearing ring (6) to be detected, so that the circular plate (2001) of the magnetic saturation unit (2) is concentric with the bearing ring (6) to be detected; Step 2: Action of uniform magnetic field under rotational motion; Energize the conductor coil (2002) of the magnetic saturation unit (2) to generate a uniform magnetic field inside the magnetic saturation unit (2). At the same time, control the driving unit (3) to drive the motor (3006) to rotate, and the rotating disc (3002) drives the bearing race to be detected (6) to make a rotational motion; Step 3: Eddy current detection of subsurface defects; The XYZ three-axis moving platform (1001) in the mobile detection unit (1) controls the L-shaped detection probe (1002) to extend into the bearing race (6). The end of the L-shaped detection probe (1002) is close to the inner wall of the bearing race to be detected (6). As the bearing race to be detected (6) rotates, the L-shaped detection probe (1002) performs circumferential eddy current scanning detection. By controlling the up and down movement of the L-shaped detection probe (1002) through the XYZ three-axis moving platform (1001), a comprehensive detection of the inner wall of the bearing race (6) can be carried out. After the detection is completed, the L-shaped detection probe (1002) rises and resets, thus completing the detection operation of the bearing.

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