Nondestructive flaw detection assembly line for defects of bearing steel balls
By designing a non-destructive testing production line using eddy current and ultrasonic testing devices, the problems of automation and accuracy in detecting surface and internal defects of bearing steel balls were solved, achieving efficient and non-destructive testing results.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- ZHEJIANG XINGCHANG BEARING
- Filing Date
- 2026-01-31
- Publication Date
- 2026-04-17
AI Technical Summary
Traditional methods for inspecting bearing steel balls present challenges in detecting surface scratches, wear, and internal defects, and also have a low degree of automation.
Design a non-destructive testing production line that includes an eddy current testing device, an immersion device, a rotary sieving device, and an ultrasonic testing device. The eddy current tester detects surface and near-surface defects, while the ultrasonic tester detects internal defects, achieving fully automated closed-loop testing.
It achieves high-precision, non-destructive detection of surface and internal defects of bearing steel balls, improving the accuracy and automation of detection, avoiding manual intervention, and meeting high-standard quality requirements.
Smart Images
Figure CN121869732A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of bearing steel ball testing technology, specifically relating to a non-destructive testing line for defects in bearing steel balls. Background Technology
[0002] As a core component of bearings, the surface quality of bearing steel balls directly affects the bearing's performance and lifespan. Traditional surface defect detection of bearing steel balls mainly relies on contact-based methods such as probe methods and contact eddy current testing. These methods obtain surface information by directly contacting the probe or probe with the steel ball surface. While this improves detection accuracy to some extent, it also has significant limitations. First, direct contact between the probe or probe and the steel ball surface can easily leave scratches, indentations, and other mechanical damage, affecting the surface quality and performance of the steel ball. Second, the relative movement between the probe or probe and the steel ball surface during testing can cause wear and material transfer, shortening the probe's or probe's lifespan and potentially introducing surface contamination, affecting the reliability of the test results.
[0003] Furthermore, quality defects in steel balls are not limited to surface defects such as microcracks and scratches; internal defects also include shrinkage cavities, porosity, cracks, and non-metallic inclusions. Therefore, there is an urgent need for a highly automated bearing steel ball defect inspection line capable of simultaneously detecting both surface and internal defects. Summary of the Invention
[0004] To address the shortcomings of existing technologies, this invention proposes the following technical solutions: A non-destructive testing line for defects in bearing steel balls includes a base, a feeding device, an eddy current testing device, an immersion device, a rotary screening device, and an ultrasonic testing device. The feeding device is located on one side of the eddy current testing device, the immersion device is located below the other side of the eddy current testing device, the rotary screening device is located below the immersion device, and the ultrasonic testing device is located on one side of the front end of the rotary screening device. The eddy current flaw detection device includes a chassis, a support frame, an eddy current flaw detector installed in the chassis, a sorting mechanism connected to the discharge port of the eddy current flaw detector, and a material discharge channel set on one side of the chassis. The sorting mechanism includes a discharge channel one, a discharge channel two, a pusher plate one and a pusher plate two symmetrically arranged, and a rotating shaft connected to one end of the pusher plate one and the pusher plate two. The immersion device includes a receiving hopper, an immersion channel, and a fixing frame for fixing the immersion channel, wherein the fixing frame is installed at one end of the support frame; The rotary screening device includes a rotary disk, a support plate and a stepper motor at the bottom of the support plate. The rotary disk has multiple solid material chambers distributed circumferentially. A first limit plate is provided at the left end of the rotary disk and a second limit plate is provided at the rear end of the rotary disk. A top plate is provided on both the first and second limit plates. An electric guide rail is provided at the bottom of the top plate, and a robotic gripper is slidably installed on the electric guide rail. The ultrasonic flaw detection device includes a support beam, a sliding plate slidably mounted on one side of the support beam, a cylinder mounted on one side of the sliding plate, and an ultrasonic flaw detector mounted at the bottom of the cylinder.
[0005] Furthermore, the feeding device includes a feeding hopper, a feeding port, a screening chamber, a distribution trough, and a discharge chamber installed below the distribution trough. The screening chamber has inclined surfaces on both sides, and a feed rod is symmetrically arranged at the bottom of the screening chamber. Multiple distribution troughs are arranged below the feed rods, and each distribution trough has a pull-out plate at its bottom.
[0006] Furthermore, electric telescopic rods are symmetrically arranged at one end of the discharge chamber near the eddy current flaw detector, and each electric telescopic rod is equipped with a clamping plate at one end.
[0007] Furthermore, an arched cover is provided outside the discharge channel one and the discharge channel two. The pusher plate one, the pusher plate two and the rotating shaft are all located at the top of the arched cover, and the arc diameter on both sides of the arched cover is larger than the arc diameter at the top of the arched cover.
[0008] Furthermore, the outlet of the second discharge channel is located on the side wall of the chassis, and the outlet of the second discharge channel is connected to a discharge hopper. A material box is located below the discharge hopper.
[0009] Furthermore, the solid material cavity is a downwardly recessed hemispherical groove, and a rotating base is provided at the bottom of the solid material cavity, with a rotating motor located below the rotating base.
[0010] Furthermore, a material box two is installed on one end support plate of the limiting plate one, and a material box three is installed on one end support plate of the limiting plate two.
[0011] Furthermore, the ultrasonic flaw detector is equipped with a fixed cover at the bottom, and multiple spray nozzles are distributed circumferentially on the fixed cover. An ultrasonic probe is located at the center of the fixed cover.
[0012] Furthermore, the inner wall of the immersion channel is provided with an immersion sponge.
[0013] Furthermore, the non-destructive testing production line is electrically connected to an external industrial control machine.
[0014] In summary, compared with the prior art, the above-described technical solutions conceived by this invention can achieve the following beneficial effects: This invention achieves fully automated closed-loop detection from feeding to sorting through multi-module collaborative design. It uses eddy current flaw detector and ultrasonic flaw detector to work together to detect surface and internal defects of steel balls. Eddy current detection is used as the initial screening to quickly remove products with surface defects, while ultrasonic detection is used as the fine inspection to confirm internal quality, improve the accuracy of defect judgment, and meet the quality standards of high-precision bearing steel balls. The feeding device automatically sorts steel balls of different specifications through the feed bar, and pushes them one by one with the electric telescopic rod and clamping plate, eliminating jamming and stacking, and ensuring stable testing cycle. After eddy current testing, the first and second pusher plates automatically separate qualified and unqualified products. The rotary screening device drives the rotating disk through a stepper motor, and the robotic gripper precisely grasps the steel balls to achieve orderly flow and ultrasonic detection positioning. The entire process requires no manual intervention. Attached Figure Description
[0015] Figure 1 This is a schematic diagram of the overall structure of the non-destructive testing production line for bearing steel ball defects of the present invention; Figure 2 This is a schematic diagram of the specific structure of the rotary screening device and ultrasonic flaw detection device of the present invention. Figure 3 This is a schematic diagram of the internal structure of the feeding device of the present invention; Figure 4 This is a schematic diagram of the specific structure of the eddy current flaw detection device of the present invention. Figure 5 This is a partial structural schematic diagram of the eddy current flaw detection device of the present invention; Figure 6 This is a schematic diagram of the ultrasonic flaw detector of the present invention.
[0016] The markings in the image are as follows: 100 - Base; 200-Feeding device; 201-Feeding hopper; 202-Screening chamber; 203-Passing rod; 204-Feed inlet; 205-Distribution trough; 206-Pull-out plate; 207-Discharge chamber; 208-Electric telescopic rod; 209-Clamping plate; 300-Eddy current flaw detection device; 301-Eddy current flaw detector; 302-Sorting mechanism; 303-Discharge hopper; 304-Discharge channel; 305-Support frame; 306-Material box one; 307-Chassis; 308-Discharge channel one; 309-Discharge channel two; 310-Push plate one; 311-Push plate two; 312-Rotating shaft; 313-Inclined bottom surface; 400 - Immersion device; 401 - Receiving hopper; 402 - Immersion channel; 403 - Fixing frame; 500-Rotary screening device; 501-Rotary disc; 502-Solid material chamber; 503-Rotary base; 504-Limiting plate one; 505-Material box two; 506-Top plate; 507-Electric guide rail; 508-Rotary motor; 509-Material box three; 510-Limiting plate two; 511-Stepper motor; 512-Support plate; 600-Ultrasonic flaw detector; 601-Support beam; 602-Sliding plate; 603-Cylinder; 604-Ultrasonic flaw detector; 605-Fixing cover; 606-Spray nozzle; 607-Ultrasonic probe. Detailed Implementation
[0017] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this invention.
[0018] Combined with appendix Figure 1-6 As shown, a non-destructive testing line for bearing steel ball defects includes a base 100, a feeding device 200, an eddy current testing device 300, an immersion device 400, a rotary screening device 500, and an ultrasonic testing device 600. The feeding device 200 is located on one side of the eddy current testing device 300, the immersion device 400 is located below the other side of the eddy current testing device 300, the rotary screening device 500 is located below the immersion device 400, and the ultrasonic testing device 600 is located on one side of the front end of the rotary screening device 500. The eddy current flaw detection device 300 includes a chassis 307, a support frame 305, an eddy current flaw detector 301 installed in the chassis 307, a sorting mechanism 302 connected to the discharge port of the eddy current flaw detector 301, and a feeding channel 304 set on one side of the chassis 307. The bottom surface of the inner wall of the feeding channel 304 is inclined. The sorting mechanism 302 includes a first discharge channel 308, a second discharge channel 309, a first pusher plate 310 and a second pusher plate 311 symmetrically arranged, and a rotating shaft 312 connected to one end of the first pusher plate 310 and the second pusher plate 311. The immersion device 400 includes a receiving hopper 401, an immersion channel 402, and a fixing frame 403 for fixing the immersion channel 402. The fixing frame 403 is installed at one end of the support frame 305. The rotary screening device 500 includes a rotary disk 501, a support plate 512, and a stepper motor 511 at the bottom of the support plate 512. The rotary disk 501 has multiple solid material chambers 502 distributed circumferentially. A retaining ring of a certain height can be provided on the outer edge of the rotary disk 501. A first limiting plate 504 is provided at the left end of the rotary disk 501, and a second limiting plate 510 is provided at the rear end of the rotary disk 501. A top plate 506 is provided on both the first limiting plate 504 and the second limiting plate 510. An electric guide rail 507 is provided at the bottom of the top plate 506, and a robotic gripper is slidably mounted on the electric guide rail 507. A drive shaft is provided at the bottom of the rotary disk 501, and the drive shaft is connected to the stepper motor 511. The stepper motor 511 is fixedly installed at the bottom of the support plate 512. The ultrasonic flaw detection device 600 includes a support beam 601, a sliding plate 602 slidably mounted on one side of the support beam 601, a cylinder 603 mounted on one side of the sliding plate 602, and an ultrasonic flaw detector 604 mounted on the bottom of the cylinder 603.
[0019] Among them, the eddy current flaw detector 301 is used to detect surface and near-surface defects of steel balls, and the ultrasonic flaw detector 604 is used to detect internal structural defects of steel balls. Both are non-destructive testing instruments, and together they achieve high-precision and high-reliability quality inspection of bearing steel balls.
[0020] Specifically, the feeding device 200 includes a feeding hopper 201, a feeding inlet 204, a screening chamber 202, a distribution trough 205, and a discharge chamber 207 installed below the distribution trough 205. The screening chamber 202 has inclined surfaces on both sides, and symmetrical feed rods 203 are arranged at the bottom of the screening chamber 202. The feed rods 203 are V-shaped, and multiple distribution troughs 205 are arranged below the feed rods 203. Each distribution trough 205 has a pull-out plate 206 at its bottom. The bottom of the feeding hopper 201 is connected to the feeding inlet 204. When steel balls of different specifications pass through the feed rods 203, the feed rods 203 screen the steel balls of different specifications, allowing steel balls of the same specifications to fall into the same distribution trough 205. Pulling out the pull-out plate 206 allows the steel balls to fall into the discharge chamber 207.
[0021] Specifically, the discharge chamber 207 is symmetrically equipped with electric telescopic rods 208 near the eddy current flaw detector 301. Each end of the electric telescopic rod 208 is equipped with a clamping plate 209. Through the reciprocating extension and retraction of the electric telescopic rods 208, steel balls can pass through the outlet of the discharge chamber 207 one by one. That is, when the previous steel ball enters the eddy current flaw detector 301 for testing, the next steel ball is clamped by the clamping plate 209 to avoid affecting the testing effect of the previous steel ball. After the previous steel ball has been tested, the clamping plate 209 moves back to both sides, and the next steel ball enters the eddy current flaw detector 301.
[0022] Specifically, an arched cover is provided outside the discharge channel 308 and the discharge channel 309. The pusher plate 310, the pusher plate 311 and the rotating shaft 312 are all located at the top of the arched cover. The diameter of the arc on both sides of the arched cover is greater than the diameter of the arc at the top of the arched cover, and the length of the pusher plate 310 and the pusher plate 311 is less than the length of the arc on both sides of the arched cover.
[0023] In addition, the bottom of the chassis 307 is provided with an inclined bottom surface 313, so that the steel balls can automatically move to the discharge channel 308 and the discharge channel 309. The bottom of the rotating shaft 312 is rotatably connected to the drive motor. The drive motor drives the pusher plate 310 and the pusher plate 311 to rotate on the inclined bottom surface 313. When the steel balls that have passed the inspection of the eddy current flaw detector 301 fall into the groove formed by the pusher plate 310 and the pusher plate 311, that is, the top of the pusher plate 310 and the pusher plate 311 abut against the two sides of the outlet of the eddy current flaw detector 301, the rotating shaft 312 of the pusher plate 310 is controlled to rotate, while the pusher plate 311 does not rotate, so that the pusher plate 310 rotates counterclockwise to a certain angle, and the qualified steel balls can fall from the arc on one side of the round cover and the top of the pusher plate 310 into the discharge channel 308. When a steel ball that fails the test by the eddy current flaw detector 301 falls into the groove formed by the pusher plate 310 and the pusher plate 311, that is, when the tops of the pusher plate 310 and the pusher plate 311 abut against the two sides of the outlet of the eddy current flaw detector 301, the rotating shaft 312 of the pusher plate 311 is controlled to rotate while the pusher plate 310 does not rotate, so that the pusher plate 311 rotates clockwise to a certain angle, and the defective steel ball can fall from the gap between the arc on the other side of the arch cover and the top of the pusher plate 311 into the discharge channel 309.
[0024] Specifically, the outlet of the second discharge channel 309 is located on the side wall of the chassis 307. The outlet of the second discharge channel 309 is connected to the discharge hopper 303. A material box 306 is provided below the discharge hopper 303. Unqualified steel balls are transferred from the second discharge channel 309 to the discharge hopper 303 and then to the material box 306, thereby realizing the recycling of unqualified steel balls.
[0025] Specifically, the solid material cavity 502 is a downwardly recessed hemispherical groove, and a rotating base 503 is provided at the bottom of the solid material cavity 502. A rotating motor 508 is provided below the rotating base 503, that is, the rotating base 503 is rotated by the rotating motor 508, so that the steel ball on the rotating base 503 can rotate for subsequent ultrasonic flaw detection.
[0026] Specifically, a material box 505 is installed on one end of the support plate 512 of the limiting plate 504. The material box 505 is used to recycle steel balls that have passed the ultrasonic flaw detection test. A material box 509 is installed on one end of the support plate 512 of the limiting plate 510. The material box 509 is used to recycle steel balls that have failed the ultrasonic flaw detection test.
[0027] Specifically, the ultrasonic flaw detector 604 has a fixed cover 605 at its bottom, with multiple spray nozzles 606 distributed circumferentially on the fixed cover 605. An ultrasonic probe 607 is located at the center of the fixed cover 605. The diameter of the fixed cover 605 is the same as the diameter of the solid material cavity 502. The fixed cover 605 helps to suppress external vibration and electromagnetic interference, ensuring the purity and repeatability of the echo signal, meeting the inspection standards for high-precision workpieces such as bearing steel balls. The multiple spray nozzles 606 distributed circumferentially can spray coupling liquid onto the surface of the steel ball. The spray nozzles 606 are connected to a commonly used spray system, which enables a uniform coupling liquid film to be formed on the surface of the steel ball, ensuring that ultrasonic energy penetrates into the interior of the steel ball efficiently, significantly improving the stability of the bottom wave and the signal-to-noise ratio of the defect echo.
[0028] In addition, the ultrasonic probe 607 is retractable and can automatically retract when not in use, effectively improving probe safety, extending its service life, and enhancing the automation adaptability and operational stability of the detection system.
[0029] Specifically, the inner wall of the immersion channel 402 is provided with an immersion sponge, which is filled with coupling liquid to achieve the initial wetting of the steel ball with coupling liquid.
[0030] Specifically, the flaw detection production line is electrically connected to an external industrial control electromechanical system to achieve high-speed, interference-resistant communication, ensuring precise coordination of detection commands, workpiece arrival signals, defect data, and equipment action timing.
[0031] In addition, the support plate 512, the fixing plate where the material box 306 is located, the support frame 305, the limiting plate 504 and the limiting plate 510, and the feeding device 200 are all equipped with corresponding support or fixing beams.
[0032] Furthermore, the depth of the solid material cavity 502 is greater than the diameter of the steel ball to be tested.
[0033] The specific workflow of this invention is as follows: Feeding and screening: A batch of steel balls enters from the feed hopper 201 and is initially screened by the feed rods 203 arranged in a figure-eight shape at the bottom of the screening chamber 202. Steel balls of the same specification fall into the corresponding distribution troughs 205. The release is controlled by the pull plate 206, and the steel balls enter the discharge chamber 207. The clamping plates 209 are driven by the electric telescopic rods 208 on both sides to push the steel balls one by one, ensuring that each steel ball enters the testing area in an orderly manner.
[0034] Surface defect detection: The steel ball is fed into the eddy current flaw detector 300, where the eddy current flaw detector 301 scans the surface and near-surface defects such as cracks and scratches at high speed. The detection results are output in real time. Qualified steel balls trigger the pusher plate 310 to rotate counterclockwise and enter the discharge channel 308 through the gap on one side of the dome cover. Qualified steel balls trigger the pusher plate 311 to rotate clockwise and enter the discharge channel 309 through the gap on the other side of the dome cover, finally falling into the material box 306 for recycling.
[0035] Preliminary immersion: Qualified steel balls slide down through the discharge channel 308 to the receiving hopper 401 of the immersion device 400, and fall at a constant speed along the immersion channel 402. The immersion sponge completes the preliminary immersion of the coupling liquid, establishing a stable acoustic coupling environment for subsequent ultrasonic testing.
[0036] Rotational positioning: After being immersed in liquid, the steel balls fall into the solid material chamber 502 of the rotary screening device 500. The stepper motor 511 drives the rotating disk 501 to rotate intermittently, so that the steel balls are aligned with the ultrasonic testing positions in sequence.
[0037] Internal defect detection: When the steel ball is below the ultrasonic flaw detector 604, the cylinder 603 drives the ultrasonic flaw detector 604 to move down, so that the fixed cover 605 covers the solid material cavity 502. At this time, the rotary motor 508 drives the rotating base 503 to rotate, so that the steel ball on the rotating base 503 rotates. The ultrasonic probe 607 detects the internal defects of the steel ball and uploads the detection results to the external industrial control computer at the same time.
[0038] Sorting: When a qualified steel ball is located under the robotic gripper on one side of limit plate 504, the robotic gripper accurately picks up a single steel ball, moves it to the top of material bin 505 and releases it. When an unqualified steel ball is located under the robotic gripper on one side of limit plate 510, the robotic gripper accurately picks up a single steel ball, moves it to the top of material bin 509 and releases it.
[0039] In addition, multiple spray nozzles 606 controlled by an external industrial control computer spray coupling liquid onto the surface of the steel ball, so that the surface of the steel ball is uniformly coated, or the solid material cavity 502 is directly covered with coupling liquid, ensuring that the steel ball is completely immersed in the coupling liquid, thereby improving the repeatability and reliability of the test.
[0040] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications and substitutions based on the technical solutions and inventive concepts provided by the present invention should be covered within the scope of protection of the present invention.
Claims
1. A bearing steel ball defect non-destructive inspection detection flow line, characterized in that: The device includes a base (100), a feeding device (200), an eddy current flaw detector (300), an immersion device (400), a rotary screening device (500), and an ultrasonic flaw detector (600). The feeding device (200) is located on one side of the eddy current flaw detector (300), the immersion device (400) is located below the other side of the eddy current flaw detector (300), the rotary screening device (500) is located below the immersion device (400), and the ultrasonic flaw detector (600) is located on one side of the front end of the rotary screening device (500). The eddy current flaw detection device (300) includes a chassis (307), a support frame (305), an eddy current flaw detector (301) installed in the chassis (307), a sorting mechanism (302) connected to the discharge port of the eddy current flaw detector (301), and a feeding channel (304) set on one side of the chassis (307). The sorting mechanism (302) includes a first discharge channel (308), a second discharge channel (309), a first pusher plate (310) and a second pusher plate (311) symmetrically arranged, and a rotating shaft (312) connected to one end of the first pusher plate (310) and the second pusher plate (311). The immersion device (400) includes a receiving hopper (401), an immersion channel (402), and a fixing frame (403) for fixing the immersion channel (402), wherein the fixing frame (403) is installed at one end of the support frame (305); The rotary screening device (500) includes a rotary disk (501), a support plate (512), and a stepper motor (511) at the bottom of the support plate (512). The rotary disk (501) has multiple solid material chambers (502) distributed circumferentially. A first limiting plate (504) is provided at the left end of the rotary disk (501), and a second limiting plate (510) is provided at the rear end of the rotary disk (501). A top plate (506) is provided on both the first limiting plate (504) and the second limiting plate (510). An electric guide rail (507) is provided at the bottom of the top plate (506), and a robotic gripper is slidably installed on the electric guide rail (507). The ultrasonic flaw detection device (600) includes a support beam (601), a sliding plate (602) slidably installed on one side of the support beam (601), a cylinder (603) installed on one side of the sliding plate (602), and an ultrasonic flaw detector (604) installed at the bottom of the cylinder (603).
2. The non-destructive testing line for defects in bearing steel balls according to claim 1, characterized in that: The feeding device (200) includes a feeding hopper (201), a feeding port (204), a screening chamber (202), a distribution trough (205), and a discharge chamber (207) installed below the distribution trough (205). The screening chamber (202) has inclined surfaces on both sides, and a feed rod (203) is symmetrically arranged at the bottom of the screening chamber (202). Multiple distribution troughs (205) are arranged below the feed rods (203), and each distribution trough (205) has a pull-out plate (206) at the bottom.
3. The non-destructive testing line for defects in bearing steel balls according to claim 1, characterized in that: The discharge chamber (207) is symmetrically provided with electric telescopic rods (208) at one end near the eddy current flaw detector (301), and each end of the electric telescopic rod (208) is provided with a clamp (209).
4. The non-destructive testing line for defects in bearing steel balls according to claim 1, characterized in that: An arched cover is provided outside the discharge channel one (308) and discharge channel two (309). The pusher plate one (310), pusher plate two (311) and rotating shaft (312) are all located at the top of the arched cover. The diameter of the arc on both sides of the arched cover is larger than the diameter of the arc at the top of the arched cover.
5. The non-destructive testing line for defects in bearing steel balls according to claim 1, characterized in that: The outlet of the second discharge channel (309) is located on the side wall of the chassis (307). The outlet of the second discharge channel (309) is connected to the discharge hopper (303). The first material box (306) is located below the discharge hopper (303).
6. The non-destructive testing line for defects in bearing steel balls according to claim 1, characterized in that: The solid material cavity (502) is a downwardly recessed hemispherical groove, and a rotating base (503) is provided at the bottom of the solid material cavity (502). A rotating motor (508) is provided below the rotating base (503).
7. The non-destructive testing line for defects in bearing steel balls according to claim 1, characterized in that: A material box 2 (505) is installed on a support plate (512) at one end of the limiting plate 1 (504), and a material box 3 (509) is installed on a support plate (512) at one end of the limiting plate 2 (510).
8. The non-destructive testing line for defects in bearing steel balls according to claim 1, characterized in that: The ultrasonic flaw detector (604) has a fixed cover (605) at its bottom, and multiple spray nozzles (606) are distributed circumferentially on the fixed cover (605). An ultrasonic probe (607) is located at the center of the fixed cover (605).
9. The non-destructive testing line for defects in bearing steel balls according to claim 1, characterized in that: The inner wall of the immersion channel (402) is provided with an immersion sponge.
10. A non-destructive testing line for defects in bearing steel balls according to claim 1, characterized in that: The non-destructive testing production line is electrically connected to an external industrial control system.