CN-122017004-A - Brake disc flaw detection device and method detected by sensor

CN122017004ACN 122017004 ACN122017004 ACN 122017004ACN-122017004-A

Abstract

The invention relates to the technical field of flaw detection, and discloses a brake disc flaw detection device and method for detecting a flaw, wherein the device comprises a movable roller conveyor and a notch formed in a side frame, a base is arranged below the roller conveyor, an isolation frame is arranged on the base, a rotatable rotating disc is arranged in the isolation frame, an induction heating coil for preheating a brake disc is arranged in the isolation frame, stress on the brake disc is eliminated through preheating, and conductivity difference caused by temperature gradient is eliminated. The invention innovatively adopts the thermal cycle excitation and surface cooling technology, introduces controllable thermal stress through an air cooling structure, enables microcracks and closed cracks on the surface of the brake disc to be physically opened, and simultaneously utilizes the magneto-elastic effect to change local magnetic permeability so as to amplify eddy current signals corresponding to the defects by a plurality of times.

Inventors

DU JIXIN
LIU HAIPENG
ZHANG JINGANG
LI GUANGBO
LIU LI

Assignees

汶上海纬机车配件有限公司

Dates

Publication Date: 20260512
Application Date: 20260126

Claims (9)

1. The brake disc flaw detection device for sensor detection is characterized by comprising a movable roller conveyor (1) and a notch (2) formed in a side frame, wherein a base (3) is arranged below the roller conveyor (1), a separation frame (4) is arranged on the base (3), a rotatable rotating disc (5) is arranged in the separation frame (4), and an induction heating coil (6) for preheating a brake disc is arranged in the separation frame (4); An air cooling structure (7) for cooling the upper surface and the lower surface of the brake disc is arranged in the isolation frame (4), a temperature gradient is formed by cooling the surface of the brake disc, the surface microcracks are physically opened by the tensile stress generated by surface shrinkage, the local magnetic conductivity is changed by the tensile stress, and the eddy current flaw detection effect is enhanced; The middle part of the rotary disk (5) is provided with a material taking structure (8) which can stretch up and down, the material taking structure (8) jacks up a brake disk on the roller conveyor (1), and after the roller conveyor (1) translates and dodges, the material taking structure (8) guides the brake disk onto the rotary disk (5); the base (3) is provided with a lifting frame (9), a movable platform of the lifting frame (9) is provided with a cover plate (10), the bottom of the cover plate (10) is provided with a plurality of groups of eddy current sensors for flaw detection, and the isolation frame (4) is sealed through the cover plate (10) to build a sealed isolation environment and improve flaw detection effect.
2. The brake disc flaw detection device detected by the sensor according to claim 1, wherein the material taking structure (8) comprises a lifting column (81) and a conical material taking head (82) arranged on the lifting column (81), a lifting system for driving the lifting column (81) to move up and down is arranged in the base (3), and the lifting column (81) drives the conical material taking head (82) to jack up from a roller gap of the roller conveyor (1) so that the conical material taking head (82) supports the brake disc and is separated from the roller conveyor (1).
3. A brake disc flaw detector according to claim 1, wherein the diameter of the bottom of the conical pick-up head (82) is larger than the diameter of the central hole of the brake disc, so that the conical pick-up head (82) can be lifted and transferred after being inserted into the central hole of the brake disc.
4. The brake disc flaw detection device detected by the sensor according to claim 1, wherein two linear modules (11) are arranged at the bottom of the roller conveyor (1), the roller conveyor (1) is driven to translate through the linear modules (11), and 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 detected by the sensor according to claim 1, wherein the rotary disc (5) is provided with a plurality of fulcrums (13) distributed in an annular array, the fulcrums (13) are made of nonmetallic materials, and the brake disc is supported and suspended through the fulcrums (13), so that heating and cooling efficiency is improved.
6. The brake disc flaw detection device detected by the sensor according to claim 1, wherein the induction heating coil (6) is arranged on the inner wall of the isolation frame (4) above the rotary disc (5), and the center of the induction heating coil (6) is that the center of the rotary disc (5) is positioned on the same vertical line, so that the rotary disc (5) is positioned at the heating center and uniformly heated.
7. The device for detecting the flaw of the brake disc by the sensor according to claim 1, wherein the air cooling structure (7) comprises two groups of air cooling annular channels which are arranged above and below the induction heating coil (6), the air cooling annular channels are made of nonmetallic materials, and a plurality of groups of oblique exhaust ports are arranged on the inner sides of the air cooling annular channels, so that air contacts the brake disc from multiple directions, the cooling effect is enhanced, and the two groups of air cooling annular channels cool the brake disc from the upper side and the lower side of the brake disc, and the cooling effect is further enhanced.
8. A brake disc flaw detection device for sensor detection according to claim 1, wherein a protective frame (12) is mounted at the bottom of the cover plate (10), 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 conduct flaw detection in a good environment.
9. A method for detecting a brake disc flaw detection device by a sensor, which is characterized in that the brake disc flaw detection device detected by the sensor according to any one of claims 1-8 is specifically operated as follows: S1, starting a roller conveyor (1), stably placing a brake disc to be detected on a conveying surface of the roller conveyor (1), conveying the brake disc to an upper area corresponding to an isolation frame (4) through a conveying function of the roller conveyor (1), ensuring that the center of the brake disc is aligned with a central axis of a material taking structure (8), and finishing feeding and positioning before detecting the flaw; S2, starting a material taking structure (8), wherein a lifting assembly of the material taking structure (8) stretches upwards, jacks up from a roller gap of a roller conveyor (1), penetrates through a central hole of a brake disc and lifts the brake disc integrally to enable the brake disc to be separated from a conveying surface of the roller conveyor (1), then, the roller conveyor (1) horizontally translates along a horizontal direction through a bottom driving structure to avoid a transferring space of the brake disc, the material taking structure (8) drives the brake disc to slowly descend, the brake disc is accurately guided onto a rotating disc (5) in a lower isolation frame (4), a supporting structure of the rotating disc (5) stably supports the brake disc, and the material taking structure (8) continuously contracts downwards to reset after transferring, S3, starting an induction heating coil (6) in the isolation frame (4), simultaneously, rotating the rotary disk (5) to drive the brake disk to rotate, enabling the induction heating coil (6) to generate an alternating magnetic field, uniformly preheating the brake disk to 40 ℃, closing the induction heating coil (6) after preheating is completed, starting a lifting frame (9) on the base (3), enabling a cover plate (10) at the top to move downwards by the lifting frame (9) until the cover plate (10) is tightly attached to the edge of the top of the isolation frame (4), completely sealing the isolation frame (4), then starting the rotary disk (5), enabling the brake disk to rotate at a constant speed, simultaneously, starting a plurality of groups of eddy current sensors at the bottom of the cover plate (10), and carrying out comprehensive scanning detection on the surface and the near surface of the brake disk, capturing abnormal signals corresponding to microcracks, and completing flaw detection data acquisition; S4, after detection, starting a lifting frame (9) on the base (3), wherein the lifting frame (9) drives a cover plate (10) at the top to move upwards, and immediately starting an air cooling structure (7) in the isolation frame (4), wherein the air cooling structure (7) simultaneously blows air from the upper surface and the lower surface of the brake disc, rapidly cooling the surface of the brake disc to form a temperature gradient with the inside, and then the lifting frame (9) drives the cover plate (10) at the top to move downwards until the cover plate (10) is tightly attached to the top edge of the isolation frame (4), and performing eddy current flaw detection again; S5, after flaw detection is completed, the eddy current sensor and the rotary disk (5) are closed, the lifting frame (9) drives the cover plate (10) to lift upwards for resetting, the sealing state of the isolation frame (4) is relieved, the material taking structure (8) is started again, the material taking structure (8) stretches upwards to jack the brake disk on the rotary disk (5), the roller conveyor (1) moves horizontally to the lower part of the brake disk, the material taking structure (8) descends slowly, the brake disk after detection is placed on the roller conveyor (1), finally, the material taking structure (8) contracts for resetting, the roller conveyor (1) conveys the brake disk after detection to a blanking area, the whole flow operation of single flaw detection is completed, and the equipment resets for waiting for next detection.

Description

Brake disc flaw detection device and method detected by sensor Technical Field The invention relates to the technical field of flaw detection, in particular to a brake disc flaw detection device and method for detecting flaw. Background The brake disc is used as a core component of a vehicle braking system, bears the defects of high-frequency friction, cold-hot alternating impact and complex stress action for a long time, is easy to generate microcracks, stress concentration and the like on the surface, and if the defects cannot be detected in time, the defects can be continuously expanded in the use process, finally the brake disc is invalid, and serious safety accidents are caused. Therefore, in the production and maintenance processes of the brake disc, flaw detection is a key link for guaranteeing product quality and driving safety. At present, the brake disc flaw detection mainly adopts technologies such as eddy current detection, magnetic powder detection and ultrasonic detection, wherein the eddy current detection becomes a mainstream detection mode due to the advantages of non-contact, high detection speed, sensitivity to surface and near-surface defects and the like. Traditional eddy current detection is mostly in a static detection mode, and signals are generated by direct disturbance of defects on an eddy current path. Microcracks, closed cracks or early stress concentration areas on the surface of the brake disc have weak disturbance effect on vortex flow, are easily covered by background noise caused by the non-uniformity of conductivity and permeability of the material, and cause that the potential defects are difficult to accurately identify, so that potential quality hazards are formed. Therefore, the invention provides a brake disc flaw detection device and method detected by a sensor. Disclosure of Invention Aiming at the defects in the prior art, the invention provides a brake disc flaw detection device and method for detecting a brake disc flaw by a sensor. The invention provides a technical scheme that a brake disc flaw detection device for sensor detection comprises a movable roller conveyor and a notch arranged on a side frame, wherein a base is arranged below the roller conveyor, an isolation frame is arranged on the base, a rotatable rotating disc is arranged in the isolation frame, and an induction heating coil for preheating a brake disc is arranged in the isolation frame; the inner part of the isolation frame is provided with an air cooling structure for cooling the upper surface and the lower surface of the brake disc, a temperature gradient is formed by cooling the surface of the brake disc, the surface microcracks are physically opened by the tensile stress generated by surface shrinkage, the local magnetic conductivity is changed by the tensile stress, and the eddy current flaw detection effect is enhanced; The middle part of the rotary disk is provided with a material taking structure which can stretch up and down, the material taking structure jacks up a brake disk on the roller conveyor, and the material taking structure guides the brake disk onto the rotary disk after the roller conveyor translates and dodges; the base is provided with a lifting frame, a movable platform of the lifting frame is provided with a cover plate, the bottom of the cover plate is provided with a plurality of groups of eddy current sensors for flaw detection, and the isolation frame is sealed through the cover plate to create a sealed isolation environment, so that flaw detection effect is improved. Preferably, the material taking structure comprises a lifting column and a conical material taking head arranged on the lifting column, a lifting system for driving the lifting column to move up and down is arranged in the base, and the lifting column drives the conical material taking head to jack up from a roller gap of the roller conveyor, so that the conical material taking head supports the brake disc and is separated from the roller conveyor. Preferably, the diameter of the bottom of the conical material taking head is larger than the diameter of the central hole of the brake disc, so that the conical material taking head can be lifted and moved upwards for transferring after being inserted into the central hole of the brake disc. Preferably, the bottom of the roller conveyor is provided with two linear modules, and the roller conveyor is driven to translate through the linear modules, so that the material taking structure drives the brake disc to move out of the notch of the roller conveyor. Preferably, the rotating disc is provided with a plurality of fulcrums distributed in an annular array, the fulcrums are made of nonmetallic materials, and the brake disc is supported and suspended through the fulcrums, so that heating and cooling efficiency is improved. Preferably, the induction heating coil is mounted on the inner wall of the isolation frame above the rotating disc, and the center of the i