Brake disc flaw detection device and method for sensor detection

Abstract

The invention relates to the technical field of flaw detection, and discloses a sensor detection brake disc flaw detection device and method, the sensor detection brake disc flaw detection device comprises a movable roller conveyor and a notch formed in one side frame, a base is arranged below the roller conveyor, an isolation frame is mounted on the base, a rotatable rotating disc is arranged in the isolation frame, and a sensor is arranged in the rotating disc. An induction heating coil used for preheating the brake disc is arranged in the isolation frame. The stress on the brake disc is eliminated through preheating, and the conductivity difference caused by the temperature gradient is eliminated. A thermal cycle excitation and surface cooling technology is innovatively adopted, controllable thermal stress is introduced through an air cooling structure, microcracks and closed cracks on the surface of the brake disc are physically opened, meanwhile, the local magnetic conductivity is changed through the magnetoelastic effect, and eddy current signals corresponding to defects are amplified by multiple times.

Description

Technical Field

[0001] This invention relates to the field of flaw detection technology, specifically to a sensor-based brake disc flaw detection device and method. Background Technology

[0002] As a core component of the vehicle braking system, the brake disc is subjected to high-frequency friction, alternating hot and cold shocks, and complex stress over a long period of time. Its surface is prone to defects such as microcracks and stress concentrations. If these defects are not detected in time, they will continue to expand during use, eventually leading to brake disc failure and causing serious safety accidents. Therefore, flaw detection is a crucial step in ensuring product quality and driving safety during the production and maintenance of brake discs. Currently, brake disc flaw detection mainly employs technologies such as eddy current testing, magnetic particle testing, and ultrasonic testing. Among these, eddy current testing has become the mainstream method due to its advantages of being non-contact, having a high detection speed, and being sensitive to surface and near-surface defects. Traditional eddy current testing is mostly a static detection mode, relying on the direct disturbance of the eddy current path by defects to generate signals. Microcracks, closed cracks, or early stress concentration areas on the brake disc surface have a weak disturbance effect on the eddy current and are easily masked by background noise caused by the non-uniformity of the material's electrical conductivity and magnetic permeability. This makes it difficult to accurately identify such potential defects, leading to potential quality problems. Therefore, this invention provides a brake disc flaw detection device and method using sensor detection. Summary of the Invention

[0003] To address the aforementioned shortcomings of existing technologies, this invention provides a sensor-based brake disc flaw detection device and method.

[0004] The present invention provides the following technical solution: a sensor-based brake disc flaw detection device, comprising a movable roller conveyor and a notch on one side frame, a base below the roller conveyor, an isolation frame mounted on the base, a rotatable rotating disk inside the isolation frame, and an induction heating coil for preheating the brake disc inside the isolation frame; by preheating, stress on the brake disc is eliminated, and conductivity differences caused by temperature gradients are eliminated, a uniform detection environment is established, and the accuracy of flaw detection is improved; The isolation frame is equipped with an air-cooling structure to cool the upper and lower surfaces of the brake disc. By cooling the surface of the brake disc to form a temperature gradient, the tensile stress generated by surface contraction causes the microcracks on the surface to physically open, and the tensile stress changes the local magnetic permeability, thus enhancing the eddy current flaw detection effect. The rotating disk is provided with a vertically retractable material-retrieving structure in the middle. The material-retrieving structure lifts the brake disc on the roller conveyor. After the roller conveyor moves horizontally to avoid it, the material-retrieving structure guides the brake disc onto the rotating disk. A lifting frame is installed on the base, and a cover plate is installed on the moving platform of the lifting frame. Several sets of eddy current sensors for flaw detection are installed at the bottom of the cover plate. The cover plate seals the isolation frame, creating a sealed isolation environment and improving the flaw detection effect.

[0005] Preferably, the material handling structure includes a lifting column and a conical material handling head installed on the lifting column. The base is provided with a lifting system for driving the lifting column to move up and down. The lifting column drives the conical material handling head to be lifted from the gap between the rollers of the roller conveyor, so that the conical material handling head supports the brake disc and disengages from the roller conveyor.

[0006] Preferably, the bottom diameter of the conical pick-up head is larger than the diameter of the central hole of the brake disc, so that after the conical pick-up head is inserted into the central hole of the brake disc, it can be lifted and moved upward for transfer.

[0007] Preferably, the bottom of the roller conveyor is provided with two linear modules, which drive the roller conveyor to move horizontally, so that the material taking structure drives the brake disc to move out of the gap of the roller conveyor.

[0008] Preferably, the rotating disk is provided with a plurality of fulcrums arranged in a circular array, and the fulcrums are made of non-metallic material. The fulcrums support the brake disk and suspend it in the air, thereby improving heating and cooling efficiency.

[0009] Preferably, the induction heating coil is installed on the inner wall of the isolation frame above the rotating disk, and the center of the induction heating coil is on the same vertical line as the center of the rotating disk, so that the rotating disk is in the heating center and the heating is uniform.

[0010] Preferably, the air-cooling structure includes two sets of air-cooling annular channels installed above and below the induction heating coil. The air-cooling annular channels are made of non-metallic materials, and the inner side of the air-cooling annular channels is provided with several sets of oblique exhaust ports, so that air can contact the brake disc from multiple directions to enhance the cooling effect. The two sets of air-cooling annular channels cool the brake disc from the upper and lower sides, further enhancing the cooling effect.

[0011] Preferably, a protective frame is installed at the bottom of the cover plate, and the protective frame is inserted into the isolation frame to isolate the induction heating coil from the outside, so that the eddy current sensor can perform flaw detection in a good environment.

[0012] A method for detecting flaws in a brake disc using a sensor, the specific operation of which is as follows: S1. Start the roller conveyor and place the brake disc to be inspected stably on the conveying surface of the roller conveyor. Through the conveying function of the roller conveyor, transport the brake disc to the upper area corresponding to the isolation frame, ensuring that the center of the brake disc is aligned with the central axis of the material picking structure, and complete the loading and positioning before inspection. S2. The material handling structure is activated. Its lifting assembly extends and retracts upwards, lifting the brake disc through the roller gaps of the roller conveyor, passing it through the central hole of the brake disc, and detaching the brake disc from the conveyor surface. Subsequently, the roller conveyor moves horizontally via its bottom drive structure, creating space for the brake disc to transfer. The material handling structure then slowly lowers the brake disc, precisely guiding it onto the rotating disc within the lower isolation frame. The rotating disc's support structure provides stable support for the brake disc. After completing the transfer, the material handling structure continues to retract and reset. S3. Activate the induction heating coil inside the isolation frame. Simultaneously, the rotating disk rotates, causing the brake disc to rotate. The induction heating coil generates an alternating magnetic field, uniformly preheating the brake disc to 40 degrees Celsius. After preheating, turn off the induction heating coil and activate the lifting frame on the base. The lifting frame moves the top cover plate downwards until the cover plate is tightly fitted with the top edge of the isolation frame, completely sealing the isolation frame. Then, activate the rotating disk, which drives the brake disc to rotate at a constant speed. At the same time, activate several sets of eddy current sensors at the bottom of the cover plate. As the brake disc rotates, the eddy current sensors perform a comprehensive scan and detection of the surface and near-surface of the brake disc, capturing abnormal signals corresponding to microcracks and completing the flaw detection data acquisition. S4. After the test, start the lifting frame on the base. The lifting frame moves the top cover plate upward and immediately starts the air-cooling structure inside the isolation frame. The air-cooling structure blows air from both the top and bottom sides of the brake disc to quickly cool the surface of the brake disc, so that a temperature gradient is formed between the surface and the inside of the brake disc. Then the lifting frame moves the top cover plate downward until the cover plate is tightly attached to the top edge of the isolation frame, and eddy current flaw detection is performed again. S5. After flaw detection is completed, shut down the eddy current sensor and the rotating disk. The lifting frame drives the cover plate to rise and reset, releasing the sealing state of the isolation frame. Restart the material handling structure. The material handling structure extends upward to lift the brake disc on the rotating disk. The roller conveyor moves horizontally to below the brake disc. The material handling structure slowly descends and places the tested brake disc on the roller conveyor. Finally, the material handling structure retracts and resets. The roller conveyor transports the tested brake disc to the unloading area, completing the entire process of a single flaw detection. The equipment is reset and awaits the next detection.

[0013] Compared with the prior art, the present invention has the following beneficial effects: (1) This invention innovatively adopts thermal cycling excitation and surface cooling technology. By introducing controllable thermal stress through the air-cooling structure, the microcracks and closed cracks on the surface of the brake disc are physically opened. At the same time, the magnetoelastic effect is used to change the local magnetic permeability, which amplifies the eddy current signal corresponding to the defect several times. Combined with the signal separation capability of the multi-frequency eddy current sensor, temperature interference is effectively eliminated, and the detection rate of microcracks and early stress concentration areas is greatly improved, solving the technical problem that traditional static detection is difficult to identify closed defects.

[0014] (2) By establishing a benchmark and a secondary flaw detection closed loop that triggers defects, combined with signal analysis logic, it is possible not only to determine whether a defect exists, but also to accurately distinguish between elastic deformation, closed cracks and permanent defects; complete signal recovery corresponds to reversible deformation, partial recovery indicates closed cracks, and no recovery or deterioration indicates irreversible defects.

[0015] (3) The heating coil and the rotating disk work together to achieve uniform temperature control of the entire brake disc, eliminating the material property differences caused by uneven room temperature and establishing a stable intrinsic reference signal; the sealing design of the cover plate, the electromagnetic isolation function of the protective frame, and the constant pressure floating fixture and displacement compensation module ensure the sealing of the flaw detection environment, the electromagnetic purity and the constantness of the probe lift-off gap, completely eliminating multiple external interferences and greatly improving the reliability and repeatability of the detection signal. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the roller conveyor structure of the present invention; Figure 3 This is a schematic diagram of the internal structure of the isolation frame of the present invention.

[0017] In the diagram: 1. Roller conveyor; 2. Notch; 3. Base; 4. Isolation frame; 5. Rotary disc; 6. Induction heating coil; 7. Air-cooled structure; 8. Material handling structure; 81. Lifting column; 82. Conical material handling head; 9. Lifting frame; 10. Cover plate; 11. Linear module; 12. Protective frame; 13. Support point. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. In order to keep the following description of the embodiments of this disclosure clear and concise, detailed descriptions of known functions and known components are omitted to avoid unnecessarily obscuring the concept of the present invention.

[0019] Please see Figure 1 and Figure 2 A sensor-based brake disc flaw detection device comprises a movable roller conveyor 1 mounted on the upper part of the device, with a notch 2 on one side frame to avoid the brake disc transfer path. Two sets of linear modules 11 are installed at the bottom of the roller conveyor 1, which can be driven to move horizontally. A base 3 is located directly below the roller conveyor 1, serving as the overall load-bearing foundation. An isolation frame 4 is fixedly installed on its upper part. The isolation frame 4 is a cavity structure with an open top, used to create an independent thermal circulation and flaw detection environment, ensuring a stable temperature field and isolation from external interference.

[0020] See Figure 3The isolation frame 4 is coaxially equipped with a rotatable rotating disk 5. The rotating disk 5 is connected to the rotation drive mechanism in the base 3, which can drive the brake disk to rotate at a uniform speed. The rotating disk 5 has a vertically extendable material picking structure 8 in the middle, which passes through the center of the rotating disk 5 and is used to lift and transfer the brake disk. The upper surface of the rotating disk 5 is provided with several support points 13 arranged in a ring array, so that the brake disk is suspended after placement, ensuring uniform heat transfer.

[0021] The material handling structure 8 includes a lifting column 81 and a conical material handling head 82. The lifting column 81 is set vertically and its bottom is connected to the lifting system in the base 3, which can achieve smooth extension and retraction. The conical material handling head 82 is fixed to the top of the lifting column 81. Its bottom diameter is larger than the diameter of the center hole of the brake disc, ensuring that it forms a stable support after being inserted into the hole, and avoiding the brake disc from shifting or being damaged during the transfer process.

[0022] When the brake disc is conveyed to the designated position, the lifting column 81 drives the conical pick-up head 82 to extend and retract upwards, passing through the roller gap of the roller conveyor 1, inserting into the center hole of the brake disc and fitting tightly. The lifting column 81 continues to rise, lifting the entire brake disc off the conveying surface. Subsequently, the linear module 11 drives the roller conveyor 1 to move horizontally, clearing the transfer space through the notch 2. The lifting column 81 drives the brake disc to slowly descend, placing it stably on the fulcrum 13 of the rotating disk 5. The pick-up structure 8 retracts downwards to reset, and the roller conveyor 1 moves horizontally to reset simultaneously, completing the transfer operation. The entire process ensures the stability of the brake disc's posture, laying the foundation for subsequent thermal cycling and flaw detection.

[0023] The induction heating coil 6 is installed on the inner wall of the isolation frame 4, with its center aligned vertically with the center of the rotating disk 5. This ensures that the rotating disk 5, when driving the brake disc to rotate, remains in the central heating area, achieving uniform heating across the entire region. The induction heating coil 6 is equipped with a precise temperature control module, which can stably maintain the target temperature. By acting on the entire brake disc with an alternating magnetic field, it achieves two core functions: first, eliminating residual stress inside the brake disc; and second, homogenizing the electrical conductivity and magnetic permeability (for ferromagnetic materials) across the entire region, eliminating material property differences caused by uneven room temperature. The air-cooling structure 7 includes two sets of upper and lower annular air-cooling channels, respectively installed above and below the induction heating coil 6. Made of non-metallic materials, it is unaffected by the induction heating coil 6. Several sets of oblique exhaust ports are located inside the annular channels, facing the center area of ​​the brake disc. When the air-cooling structure 7 is working, airflow is ejected from the oblique exhaust ports, forming a bidirectional cooling airflow that fully contacts both the upper and lower surfaces of the brake disc, achieving rapid surface cooling and promoting a controllable temperature gradient between the surface and interior of the brake disc. The surface tensile stress generated in this process, on the one hand, physically opens the microcracks on the surface, and on the other hand, changes the local magnetic permeability through the magnetoelastic effect, providing a strengthened signal source for eddy current detection.

[0024] A lifting frame 9 is fixedly installed on one side of the base 3. The bottom of the moving platform of the lifting frame 9 is fixedly connected to the cover plate 10. Several sets of eddy current sensors are installed at the bottom of the cover plate 10. The eddy current sensors at the bottom of the cover plate 10 adopt multi-frequency / pulse eddy current technology, which can separate the conductivity change signal caused by temperature and the crack signal, and has high sensitivity to the crack opening depth. The sensor is installed by a constant pressure floating fixture. With the non-contact eddy current displacement compensation module integrated in the cover plate 10, it ensures that the lifting gap between the probe and the surface of the brake disc is constant during heating and cooling, and avoids gap fluctuations from drowning out the defect signal.

[0025] The protective frame 12 is fixed to the bottom of the cover plate 10. When the cover plate 10 descends to the top of the isolation frame 4, the protective frame 12 is inserted into the isolation frame 4, isolating the induction heating coil 6 outside the detection area of ​​the eddy current sensor to avoid electromagnetic interference. At the same time, the cover plate 10 and the isolation frame 4 are tightly fitted to create a sealed isolation environment, reducing the influence of external airflow and impurities on the flaw detection signal. When the rotating disk 5 drives the brake disk to rotate at a constant speed, the eddy current sensor synchronously performs a full-domain scan, collecting eddy current impedance signals under different thermal states to provide data support for subsequent differential analysis.

[0026] Complete operation process implementation Loading and positioning: Start the roller conveyor 1, place the brake disc to be inspected stably on the conveying surface, and transport it to the corresponding area above the isolation frame 4 by the roller conveyor 1. Ensure that the center of the brake disc is aligned with the central axis of the material picking structure 8 to complete the positioning and avoid deviation during subsequent thermal cycling and inspection.

[0027] Transfer into the frame: The lifting system of the material handling structure 8 is activated. The lifting column 81 drives the conical material handling head 82 to extend and retract upward, passing through the gap between the rollers of the roller conveyor 1, inserting into the center hole of the brake disc and fitting tightly. The lifting column 81 continues to rise, lifting the brake disc away from the conveying surface. Subsequently, the linear module 11 drives the roller conveyor 1 to move horizontally, avoiding the transfer space through the notch 2. The lifting column 81 drives the brake disc to slowly descend, placing it smoothly on the fulcrum 13 of the rotating disk 5, with the brake disc in a suspended state. The material handling structure 8 retracts downward to reset.

[0028] Initial Preheating and Baseline Establishment (First Flaw Detection): The induction heating coil 6 is activated, and simultaneously, the drive mechanism of the rotating disk 5 is activated. The rotating disk 5 drives the brake disc to rotate at a constant speed, ensuring the brake disc is uniformly heated and stabilized at the target temperature in an alternating magnetic field. This achieves uniform conductivity and stable magnetic permeability, eliminating background noise caused by differences in material properties. After preheating, the temperature is stabilized. The lifting frame 9 is activated, moving the cover plate 10 downwards until it is tightly fitted against the top of the isolation frame 4. The protective frame 12 isolates the induction heating coil 6, and the displacement compensation module is activated to monitor the lifting gap. The brake disc is kept rotating at a constant speed. The multi-frequency eddy current sensor is activated to perform a comprehensive scan of the brake disc surface and near-surface, collecting the eddy current impedance signal under these conditions. This signal serves as the intrinsic baseline signal indicating that the workpiece is free from thermal stress interference and has uniform material properties.

[0029] Cooling and Defect Induction (Second Flaw Detection): The induction heating coil 6 is shut off, and the lifting frame 9 raises the cover plate 10 to release the seal. The air-cooling structure 7 is immediately activated, with airflow from the upper and lower annular channels rapidly cooling the upper and lower surfaces of the brake disc, creating a controllable temperature gradient. The tensile stress generated by surface contraction physically opens the microcracks, simultaneously altering the local magnetic permeability and enhancing the eddy current signal response. After cooling, the air-cooling structure 7 is shut off, and the lifting frame 9 lowers the cover plate 10 again to seal. The rotating disk 5 continues to rotate the brake disc, and the eddy current sensor performs a second comprehensive scan, acquiring the signal after defect induction. This signal is then differentially compared with a reference signal to eliminate interference from the conductivity gradient caused by temperature, highlighting the abnormal signal changes corresponding to the crack.

[0030] Material Unloading and Reset: After flaw detection, the eddy current sensor, rotary disk 5, and induction heating coil 6 are shut off. The lifting frame 9 drives the cover plate 10 to rise and reset, releasing the seal. The material handling structure 8 is activated. The lifting column 81 drives the conical material handling head 82 to extend and retract upward, inserting into the center hole of the brake disc and lifting it off the fulcrum 13. The roller conveyor 1 moves horizontally to below the brake disc, and the lifting column 81 slowly descends, placing the brake disc on the conveying surface. The material handling structure 8 retracts and resets, and the roller conveyor 1 transports the brake disc to the unloading area, completing a single inspection. All components are reset, awaiting the next operation.

[0031] The above embodiments are merely exemplary embodiments of the present invention and are not intended to limit the present invention. The scope of protection of the present invention is defined by the claims. Those skilled in the art can make various modifications or equivalent substitutions to the present invention within its spirit and scope of protection, and such modifications or equivalent substitutions should also be considered to fall within the scope of protection of the present invention.

Claims

1. A sensor-based brake disc flaw detection device, characterized in that: It includes a movable roller conveyor (1) and a notch (2) on one side frame. A base (3) is provided below the roller conveyor (1). An isolation frame (4) is installed on the base (3). A rotatable rotating disk (5) is provided inside the isolation frame (4). An induction heating coil (6) for preheating the brake disc is provided inside the isolation frame (4). By preheating, the stress on the brake disc is eliminated, and the conductivity difference caused by the temperature gradient is eliminated, a unified detection environment is established, and the accuracy of flaw detection is improved. The isolation frame (4) is equipped with an air-cooling structure (7) to cool the upper and lower surfaces of the brake disc. By cooling the surface of the brake disc to form a temperature gradient, the tensile stress generated by the surface contraction causes the microcracks on the surface to open physically, and the tensile stress changes the local magnetic permeability, thus enhancing the eddy current flaw detection effect. The rotating disk (5) has a vertically extendable material-taking structure (8) in the middle. The material-taking structure (8) lifts the brake disc on the roller conveyor (1). After the roller conveyor (1) moves to avoid it, the material-taking structure (8) guides the brake disc onto the rotating disk (5). A lifting frame (9) is installed on the base (3), and a cover plate (10) is installed on the moving platform of the lifting frame (9). Several sets of eddy current sensors for flaw detection are installed at the bottom of the cover plate (10). The isolation frame (4) is sealed by the cover plate (10) to create a sealed isolation environment and improve the flaw detection effect.

2. The brake disc flaw detection device based on sensor detection according to claim 1, characterized in that: The material handling structure (8) includes a lifting column (81) and a conical material handling head (82) installed on the lifting column (81). The base (3) is provided with a lifting system for driving the lifting column (81) to move up and down. The lifting column (81) drives the conical material handling head (82) to lift up from the roller gap of the roller conveyor (1), so that the conical material handling head (82) supports the brake disc and disengages from the roller conveyor (1).

3. The brake disc flaw detection device based on sensor detection according to claim 1, characterized in that: The bottom diameter of the conical pick-up head (82) is larger than the diameter of the central hole of the brake disc, so that after the conical pick-up head (82) is inserted into the central hole of the brake disc, it can be lifted up and moved for transfer.

4. The brake disc flaw detection device based on sensor detection according to claim 1, characterized in that: The bottom of the roller conveyor (1) is provided with two linear modules (11). The roller conveyor (1) is driven to move horizontally through the linear modules (11), so that the material taking structure (8) drives the brake disc to move out of the notch (2) of the roller conveyor (1).

5. The brake disc flaw detection device based on sensor detection according to claim 1, characterized in that: The rotating disk (5) is provided with several fulcrums (13) arranged in a ring array. The fulcrums (13) are made of non-metallic materials. The brake disk is supported by the fulcrums (13) and suspended in the air, thereby improving heating and cooling efficiency.

6. The brake disc flaw detection device based on sensor detection according to claim 1, characterized in that: The induction heating coil (6) is installed on the inner wall of the isolation frame (4) above the rotating disk (5), and the center of the induction heating coil (6) is on the same vertical line as the center of the rotating disk (5), so that the rotating disk (5) is in the heating center and the heating is uniform.

7. The brake disc flaw detection device based on sensor detection according to claim 1, characterized in that: The air-cooled structure (7) includes two sets of air-cooled annular channels installed above and below the induction heating coil (6). The air-cooled annular channels are made of non-metallic materials, and the inner side of the air-cooled annular channels is provided with several sets of oblique exhaust ports, so that air can contact the brake disc from multiple directions to enhance the cooling effect. The two sets of air-cooled annular channels cool the brake disc from the upper and lower sides, further enhancing the cooling effect.

8. The brake disc flaw detection device based on sensor detection according to claim 1, characterized in that: The bottom of the cover plate (10) is equipped with a protective frame (12), and the protective frame (12) is inserted into the isolation frame (4) to isolate the induction heating coil (6) from the outside, so that the eddy current sensor can perform flaw detection in a good environment.

9. A method for detecting flaws in a brake disc using a sensor, characterized in that, The brake disc flaw detection device using any one of the sensors described in claims 1-8 operates as follows: S1. Start the roller conveyor (1), place the brake disc to be inspected stably on the conveying surface of the roller conveyor (1), and transport the brake disc to the upper area corresponding to the isolation frame (4) through the conveying function of the roller conveyor (1), ensuring that the center of the brake disc is aligned with the central axis of the material picking structure (8) to complete the loading and positioning before inspection. S2. Start the material handling structure (8). The lifting component of the material handling structure (8) extends and retracts upward, lifting it from the gap between the rollers of the roller conveyor (1), passing through the central hole of the brake disc, and lifting the brake disc as a whole, so that the brake disc is separated from the conveying surface of the roller conveyor (1). Subsequently, the roller conveyor (1) moves horizontally through the bottom drive structure to avoid the transfer space of the brake disc. The material handling structure (8) drives the brake disc to slowly descend, accurately guiding the brake disc into the rotating disk (5) in the lower isolation frame (4). The support structure of the rotating disk (5) provides stable support for the brake disc. After the material handling structure (8) completes the transfer, it continues to retract and reset downward. S3. Start the induction heating coil (6) inside the isolation frame (4). At the same time, the rotating disk (5) rotates and drives the brake disk to rotate. The induction heating coil (6) generates an alternating magnetic field to uniformly preheat the brake disk to 40 degrees. After preheating, turn off the induction heating coil (6) and start the lifting frame (9) on the base (3). The lifting frame (9) drives the top cover plate (10) to move downward until the cover plate (10) is tightly attached to the top edge of the isolation frame (4) to completely seal the isolation frame (4). Then start the rotating disk (5). The rotating disk (5) drives the brake disk to rotate at a constant speed. At the same time, start several sets of eddy current sensors at the bottom of the cover plate (10). The eddy current sensors perform a comprehensive scan and detection of the surface and near surface of the brake disk as the brake disk rotates, capturing the abnormal signals corresponding to the microcracks and completing the flaw detection data acquisition. S4. After the test, start the lifting frame (9) on the base (3). The lifting frame (9) moves the top cover plate (10) upward and immediately starts the air-cooling structure (7) in the isolation frame (4). The air-cooling structure (7) blows air from both the upper and lower sides of the brake disc to quickly cool the surface of the brake disc, so that a temperature gradient is formed between the surface of the brake disc and the interior. Then the lifting frame (9) moves the top cover plate (10) downward until the cover plate (10) is tightly attached to the top edge of the isolation frame (4) and eddy current flaw detection is performed again. S5. After the flaw detection is completed, shut down the eddy current sensor and the rotating disk (5). The lifting frame (9) drives the cover plate (10) to rise and reset, releasing the sealing state of the isolation frame (4). Start the material taking structure (8) again. The material taking structure (8) extends and lifts the brake disc on the rotating disk (5). The roller conveyor (1) moves horizontally to below the brake disc. The material taking structure (8) slowly descends and places the brake disc that has been tested on the roller conveyor (1). Finally, the material taking structure (8) retracts and resets. The roller conveyor (1) transports the tested brake disc to the unloading area, completing the entire process of a single flaw detection. The equipment is reset and waiting for the next test.

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