Absorbing scanning device and detection method for generator back ring array eddy current detection

Abstract

The application discloses an adsorption type scanning device and a detection method for generator ring array eddy current detection. The device comprises a support frame capable of being adsorbed on an engine ring, a sliding structure arranged on the support frame, a probe clamping device capable of moving along the circumferential direction and the axial direction of the engine ring connected to the sliding structure, an array eddy current probe and an encoder connected to the probe clamping device, and the probe clamping device enables the array eddy current probe to abut against the detection surface of the engine ring to perform surface defect detection. The array eddy current probe is used for detecting the detection surface of the engine ring, and the encoder is used for recording the position, so that the detection position corresponds to the probe detection data one by one. The application can accurately correspond the scanning data position to the actual position, accurately position and quantify the defect position, realize efficient, safe and accurate detection of the engine ring, and facilitate corresponding evaluation of the use condition and safety performance of the generator ring.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of generator ring detection, and particularly relates to a kind of generator ring array eddy current detection suction type scanning device and detection method. BACKGROUND

[0002] Generator ring is an important component to protect the rotor of generator, and arc in the operation process can cause the generator ring to burn and damage, causing damage to the rotor of the generator. The material of the ring is 18Cr18Mn, and the metallographic structure is austenitic stainless steel without magnetism.

[0003] Now the detection of its outer surface is mainly penetration detection. Penetration detection has high labor intensity, and the reagent used in penetration detection is harmful to the human body. After the detection is completed, the on-site cleaning work is complicated, and harmless treatment is required due to environmental pollution caused by the detection reagent. The four steps of applying the penetration agent, wiping off the surface penetration agent, applying the developing agent and observing have relatively large working intensity. The surface area of the generator ring is large, and the environment of the generator rotor is difficult to use automatic equipment, causing the detection personnel to directly contact the harmful detection reagent, and the random disposal of the container of the detection reagent will cause corresponding environmental pollution. Therefore, the detection reagent and its container may need special harmless treatment.

[0004] The generator ring is non-magnetic in theory, and can be detected by eddy current detection. However, the traditional eddy current detection can only use a pen-shaped probe for detection at present. The detection contact area is small, and it is easy to miss detection, and it is time-consuming and labor-intensive. The evaluation of defects is not accurate enough. Therefore, ordinary eddy current detection is rarely used for ring detection at present.

[0005] Array eddy current detection technology uses array sensors, which can realize rapid detection of surface and near-surface defects of components, and can realize high-speed measurement of a large area without using mechanical probe scanning. It can achieve the same measurement accuracy and resolution as a single sensor, effectively improving the test speed, measurement accuracy and reliability of the sensor system.

[0006] In order to reduce labor intensity and reduce damage to the human body and pollution to the environment caused by detection work, array eddy current detection is a feasible direction to replace penetration detection. Array eddy current detection has high sensitivity, is harmless to the human body and environment, does not require the use of other auxiliary chemicals and reagents, can detect the generator ring with paint, and can detect not only surface defects but also near-surface defects.

[0007] During eddy current detection, the probe is usually held by hand to scan the ring, and the encoder is used to record the scanning position to form a scanning result image on the instrument. Because the probe is held by hand for scanning, hand shaking and scanning route deviation may occur during scanning, resulting in deviation between the defect position on the detection data and the actual defect position.

[0008] Therefore, based on years of experience and practice in related industries, the inventor proposes an adsorption-type scanning device and detection method for eddy current detection of generator retaining ring arrays to overcome the defects of existing technologies. Summary of the Invention

[0009] The purpose of this invention is to provide an adsorption-type scanning device and method for eddy current testing of generator retaining ring arrays. This method avoids the deviation between the defect location in the detection data and the actual defect location caused by problems such as hand tremors and scanning route deviations. It ensures that the scanning data location corresponds accurately to the actual location, accurately locates and quantifies the defect location, and achieves efficient, safe and accurate testing of the generator retaining ring. This facilitates the corresponding evaluation of the usage condition and safety performance of the generator retaining ring.

[0010] The objective of this invention is achieved as follows: an adsorption-type scanning device for eddy current testing of a generator retaining ring includes a support frame capable of adsorbing onto the generator retaining ring. A sliding structure is provided on the support frame, and a probe clamping device is connected to the sliding structure, capable of moving circumferentially and axially along the generator retaining ring. An array eddy current probe and an encoder are connected to the probe clamping device. The probe clamping device allows the array eddy current probe to abut against the detection surface of the generator retaining ring for surface defect detection. The array eddy current probe is used for detecting the detection surface of the generator retaining ring, and the encoder is used for recording the detection position, ensuring a one-to-one correspondence between the detection position and the probe detection data.

[0011] In a preferred embodiment of the present invention, the bottom of the support frame is provided with a plurality of suction cups that can be adsorbed onto the engine guard ring.

[0012] In a preferred embodiment of the present invention, the sliding structure includes a circumferential sliding portion and an axial sliding portion. The circumferential sliding portion includes a slide rail that can move circumferentially along the engine guard ring, and the slide rail is slidably connected to the support frame. The axial sliding portion includes an axial support arranged axially along the engine guard ring, the axial support is fixedly connected to one end of the slide rail, a slide rod is provided on the axial support, and the probe clamping device is slidably connected to the slide rod.

[0013] In a preferred embodiment of the present invention, the support frame is provided with an arc-shaped slide channel, the slide rail slides through the slide channel, the slide rail is provided with a first rack arranged circumferentially along the engine guard ring, and the support frame is provided with a first gear, the first gear meshing with the first rack.

[0014] In a preferred embodiment of the present invention, a support rod parallel to the slide rod is further connected to the axial support, and a second rack is provided on the slide rod; the probe clamping device includes a main support, the main support includes a perforated plate, the perforated plate is slidably sleeved on the slide rod and the support rod; a second gear is hinged on the main support, and the second gear meshes with the second rack.

[0015] In a preferred embodiment of the present invention, the main support includes a fixing plate, a probe connecting frame is elastically connected to the lower part of the fixing plate, a probe slot is provided on the probe connecting frame, and the array eddy current probe is fixedly connected in the probe slot; the encoder is connected to the outer side of the probe connecting frame.

[0016] In a preferred embodiment of the present invention, at least one shaft pin is provided extending upward from the top of the probe connecting frame, a through hole is provided on the fixing plate, the shaft pin can slide through the through hole, and a spring is provided on the shaft pin between the fixing plate and the probe connecting frame.

[0017] In a preferred embodiment of the present invention, a copper sleeve is provided in the through hole, and the shaft pin slides through the copper sleeve.

[0018] In a preferred embodiment of the present invention, the probe connecting frame is provided with positioning bolts that can fix the array eddy current probe.

[0019] The object of the present invention can also be achieved as follows: a detection method comprising the following steps:

[0020] Step a, Test block selection: Select a test block, and set at least one defect hole on the test block;

[0021] Step b, Detection parameter selection and sensitivity adjustment: Select encoder recording mode for scanning and recording, select the corresponding frequency and gain to scan and test the test block, and identify the defect signal by adjusting the gain and phase. The defect hole should be clearly visible in the C-scan image; after scanning, record the defect signal amplitude and phase of the defect hole at that gain and frequency.

[0022] Step c: Assemble the aforementioned adsorption-type scanning device for eddy current detection of generator retaining ring array;

[0023] Step d, Scanning: Select the starting detection area, attach the generator retainer ring array eddy current detection adsorption scanning device to the engine retainer ring, and perform axial and circumferential scanning with the array eddy current probe; the coverage area of ​​each scan by the array eddy current probe should be greater than 15% of the effective detection range;

[0024] Step e: When inspecting the engine retaining ring, keep the scanning frequency of step b unchanged and increase the gain to scan the engine retaining ring in a fixed scanning direction, and record the defects whose defect signal amplitude is greater than the defect signal amplitude of the required aperture.

[0025] During testing, the array eddy current probe is held in hand and first axially inspected by moving the array eddy current probe along the axial direction of the engine retainer. After the axial inspection is completed, the array eddy current probe is moved circumferentially and then axially inspected again. The above actions are repeated to inspect the engine retainer to complete the inspection of the entire engine retainer.

[0026] Step f, Defect Assessment: The inspection conclusion is unqualified if the following defects are found: the defect signal amplitude is greater than the defect signal amplitude of the defect hole with the required aperture; the defect phase is greater than 30° different from the phase of the defect hole with the required aperture; or a crack is found.

[0027] Step g: If the array eddy current test result is unqualified, record the impedance diagram, C-scan diagram, and location of the defect.

[0028] As described above, the adsorption-type scanning device and detection method for eddy current detection of generator retaining ring array of the present invention have the following beneficial effects:

[0029] In the adsorption-type scanning device for generator retaining ring array eddy current testing of the present invention, the support frame, sliding structure, and probe clamping device work together to assist the array eddy current probe in scanning and testing. This ensures that the array eddy current probe is in close contact with the testing surface of the engine retaining ring, and the encoder is close to the outer surface of the retaining ring. This avoids deviations between the defect location in the testing data and the actual defect location caused by hand tremors or scanning route deviations, ensuring a precise correspondence between the scanning data location and the actual location. This allows for accurate positioning and quantification of the defect location, facilitating the assessment of the generator retaining ring's usage condition and safety performance. The generator retaining ring testing device based on array eddy current of the present invention is semi-automatic, making on-site installation and operation convenient, and offering high testing efficiency. Using the present invention for testing does not require removing the surface insulating varnish layer, thus avoiding damage to the varnish layer. Penetration and ultrasonic phased array testing, on the other hand, require the removal of the surface varnish layer. Using the present invention for testing can replace penetration testing and avoid the drawbacks of traditional eddy current testing, ensuring the correspondence between the testing data and the actual testing location, and achieving efficient, safe, and reliable testing of the generator retaining ring. Attached Figure Description

[0030] The following figures are intended only to illustrate and explain the present invention and do not limit the scope of the invention. Wherein:

[0031] Figure 1 : This is a schematic diagram of the adsorption-type scanning device for eddy current detection of generator retaining ring array according to the present invention.

[0032] Figure 2: This is a side view of the adsorption-type scanning device for eddy current detection of generator retaining ring array according to the present invention.

[0033] Figure 3 : This is a front view of the adsorption-type scanning device for eddy current detection of generator retaining ring array according to the present invention.

[0034] Figure 4 : This is a schematic diagram of the support frame of the present invention.

[0035] Figure 5 : This is a schematic diagram of the probe clamping device of the present invention.

[0036] Figure 6 : This is a side view of the probe clamping device of the present invention.

[0037] Figure 7 : This is a front view of the probe clamping device of the present invention.

[0038] Figure 8 : This is a schematic diagram of the test block of the present invention.

[0039] Figure 9 This is a schematic diagram of the detection status of the adsorption-type scanning device for eddy current detection of generator retaining ring array according to the present invention.

[0040] In the picture:

[0041] 100. Adsorption-type scanning device for eddy current detection of generator retaining ring array;

[0042] 1. Support frame;

[0043] 10. Slideway; 11. First gear; 12. Side plate; 13. Support beam;

[0044] 2. Probe clamping device;

[0045] 21. Main bracket; 22. Orifice plate; 23. Second gear; 24. Fixing plate; 25. Probe connecting bracket; 251. Probe slot; 26. Shaft pin; 27. Spring; 28. Copper sleeve; 29. ​​Positioning bolt;

[0046] 3. Arrayed eddy current probe;

[0047] 4. Encoder;

[0048] 5. Sliding structure;

[0049] 51. Slide rail; 511. First rack; 52. Axial support; 53. Slide rod; 531. Second rack; 54. Support rod;

[0050] 6. Engine guard ring;

[0051] 7. Suction cup;

[0052] 8. Test block; 81. Defect hole. Detailed Implementation

[0053] To provide a clearer understanding of the technical features, objectives, and effects of the present invention, specific embodiments of the present invention will now be described with reference to the accompanying drawings.

[0054] The specific embodiments of the present invention described herein are for illustrative purposes only and should not be construed as limiting the invention in any way. Under the teachings of this invention, those skilled in the art can conceive of any possible modifications based on the invention, all of which should be considered within the scope of the invention. It should be noted that when an element is referred to as being "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or there may be an intervening element. The terms "mounted," "connected," and "linked" should be interpreted broadly; for example, they can refer to mechanical or electrical connections, or internal communication between two elements, and can be direct or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible embodiments.

[0055] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0056] like Figures 1 to 9 As shown, the present invention provides an adsorption-type scanning device 100 for generator retainer ring array eddy current testing, including a support frame 1 that can be adsorbed onto the engine retainer ring 6, a sliding structure 5 provided on the support frame 1, and a probe clamping device 2 connected to the sliding structure 5 that can move along the circumference and axial direction of the engine retainer ring; an array eddy current probe 3 and an encoder 4 are connected to the probe clamping device 2, the probe clamping device 2 enables the array eddy current probe 3 to abut against the detection surface of the engine retainer ring for surface defect detection, the array eddy current probe 3 is used for detection of the detection surface of the engine retainer ring, and the encoder 4 is used for recording the detection position, so that the detection position corresponds one-to-one with the probe detection data.

[0057] Ultrasonic phased array testing is an acoustic testing method based on ultrasound. Array eddy current testing is a detection method based on electromagnetic induction. It involves bringing a conductor close to a coil carrying alternating current. The coil establishes an alternating magnetic field, which, through the conductor, induces electromagnetic induction, creating eddy currents within the conductor. These eddy currents also generate their own magnetic fields, altering the strength of the original magnetic field and consequently changing the coil voltage and impedance. When defects appear on or near the conductor's surface, they affect the intensity and distribution of the eddy currents. These changes in the eddy currents, in turn, cause changes in the detection coil voltage and impedance. Based on these changes, the presence of defects within the conductor can be indirectly determined. Array eddy current testing technology uses an array of sensors, enabling rapid detection of surface and near-surface defects in components. It achieves high-speed, large-area measurements without the need for mechanical probe scanning, achieving the same measurement accuracy and resolution as a single sensor, effectively improving the testing speed, measurement accuracy, and reliability of the sensor system.

[0058] Ultrasonic phased arrays are used to detect internal defects in retaining rings. However, due to the blind zone of the phased array probe, surface and near-surface defects in the retaining ring cannot be detected. Array eddy currents are mainly used to detect surface and near-surface defects in the retaining ring.

[0059] In the adsorption-type scanning device for generator retaining ring array eddy current testing of the present invention, the support frame, sliding structure, and probe clamping device work together to assist the array eddy current probe in scanning and testing. This ensures that the array eddy current probe is in close contact with the testing surface of the engine retaining ring, and the encoder is close to the outer surface of the retaining ring. This avoids deviations between the defect location in the testing data and the actual defect location caused by hand tremors or scanning route deviations, ensuring a precise correspondence between the scanning data location and the actual location. This allows for accurate positioning and quantification of the defect location, facilitating the assessment of the generator retaining ring's usage condition and safety performance. The generator retaining ring testing device based on array eddy current of the present invention is semi-automatic, making on-site installation and operation convenient, and offering high testing efficiency. Using the present invention for testing does not require removing the surface insulating varnish layer, thus avoiding damage to the varnish layer. Penetration and ultrasonic phased array testing, on the other hand, require the removal of the surface varnish layer. Using the present invention for testing can replace penetration testing and avoid the drawbacks of traditional eddy current testing, ensuring the correspondence between the testing data and the actual testing location, and achieving efficient, safe, and reliable testing of the generator retaining ring.

[0060] Furthermore, such as Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, the bottom of the support frame 1 is provided with multiple suction cups 7 that can be adsorbed onto the engine guard ring 6. In a specific embodiment of the present invention, the number of suction cups 7 is 4. The suction cups 7 are hand-pressable suction cups, which have high safety and are convenient for adsorption and removal operations. The suction cups 7 are used to adsorb and fix the support frame 1 onto the engine guard ring 6.

[0061] Furthermore, such as Figure 1 , Figure 2 , Figure 3 As shown, the sliding structure 5 includes a circumferential sliding part and an axial sliding part. The circumferential sliding part includes a slide rail 51 that can move circumferentially along the engine guard ring, and the slide rail 51 is slidably connected to the support frame 1. The axial sliding part includes an axial support 52 arranged along the axial direction of the engine guard ring, and the axial support 52 is fixedly connected to one end of the slide rail 51. A slide rod 53 is arranged on the axial support 52, and the probe clamping device 2 is slidably connected to the slide rod 53. The slide rail 51 is used to drive the array eddy current probe 3 to slide circumferentially, so as to complete the scanning of the engine guard ring 6 by the array eddy current probe 3.

[0062] Furthermore, such as Figure 1 , Figure 4 As shown, the support frame 1 is provided with an arc-shaped slide channel 10, and the slide rail 51 slides through the slide channel 10. The slide rail 51 is provided with a first rack 511 arranged circumferentially along the engine guard ring. The support frame 1 is provided with a first gear 11, which meshes with the first rack 511. The first gear 11 supports the slide rail 51 to slide.

[0063] In this embodiment, such as Figure 4 As shown, the support frame 1 includes two parallel and spaced side plates 12, with a suction cup 7 installed at the bottom of each end of the side plate 12; a sliding channel 10 is provided on the outer surface of each side plate 12, and a first gear 11 is hinged to each side plate 12; multiple support beams 13 are fixedly connected between the two side plates 12, and the support beams 13 are used to support the side plates 12 to make the entire device structure stable.

[0064] Furthermore, such as Figure 1 , Figure 2 , Figure 3 As shown, the axial support 52 is also connected to a support rod 54 parallel to the slide rod 53, and a second rack 531 is provided on the slide rod 53; the probe clamping device 2 includes a main support 21, which includes a perforated plate 22, which is slidably fitted onto the slide rod 53 and the support rod 54; a second gear 23 is hinged on the main support 21, and the second gear 23 meshes with the second rack 531. The slide rod 53 and the support rod 54 cooperate to support the array eddy current probe 3, so that the array eddy current probe 3 slides stably along the axial direction.

[0065] Furthermore, such as Figure 5 , Figure 6 , Figure 7 As shown, the main support 21 includes a fixing plate 24, a probe connecting frame 25 is elastically connected to the bottom of the fixing plate 24, a probe slot 251 is provided on the probe connecting frame 25, an array eddy current probe 3 is fixedly connected in the probe slot 251, and an encoder 4 is connected to the outer side of the probe connecting frame 25.

[0066] Furthermore, such as Figure 5 , Figure 6 , Figure 7 As shown, at least one pin 26 extends upward from the top of the probe connecting bracket 25. A through hole is provided on the fixing plate 24, through which the pin 26 can slide. A spring 27 is provided on the pin 26 between the fixing plate 24 and the probe connecting bracket 25. The spring 27 is used to apply pressure to the array eddy current probe 3 during the detection process, so that it is in close contact with the detection surface (protective ring surface) of the engine retaining ring.

[0067] Furthermore, such as Figure 5 , Figure 6 , Figure 7 As shown, a copper sleeve 28 is provided inside the through hole, and a shaft pin 26 slides through the copper sleeve 28.

[0068] Furthermore, such as Figure 5 , Figure 6 , Figure 7 As shown, the probe connecting bracket 25 is equipped with positioning bolts 29 that can fix the array eddy current probe.

[0069] The array eddy current probe 3 is connected to the probe slot 251 of the probe connector 25, and then the positioning bolt 29 is tightened to fix the array eddy current probe 3. The encoder is also fixed to the probe connector 25 with positioning bolts.

[0070] The present invention also provides a detection method, comprising the following steps:

[0071] Step a, Selecting test block 8: Select test block 8, such as... Figure 8 As shown, at least one defect hole 81 is provided on the test block 8;

[0072] The test block 8 is made of a material similar to or the same as the material of the protective ring being tested. Three through holes of φ1.5mm, φ2mm, and φ3mm are machined on the test block 5. The hole diameter error is no greater than ±0.02mm, the hole perpendicularity deviation is no greater than 0.1°, and other dimensional errors are no greater than ±0.05mm. The three hole diameters represent different sensitivities, and the sensitivity can be selected according to technical requirements. In a specific embodiment of the present invention, the φ1.5mm hole defect sensitivity is used for testing.

[0073] Step b, Detection parameter selection and sensitivity adjustment: Select encoder recording mode for scanning and recording, select the corresponding frequency and gain to scan and test the test block, and identify the defect signal by adjusting the gain and phase. The defect hole should be clearly visible in the C-scan image; after scanning, record the defect signal amplitude and phase of the defect hole at that gain and frequency.

[0074] Step c: Assemble the aforementioned adsorption-type scanning device 100 for generator retaining ring array eddy current detection: Connect the array eddy current probe 3 and encoder 4 to the probe clamping device 2, connect the probe clamping device 2 to the support frame 1, and adjust the array eddy current probe 3 and encoder 4.

[0075] Step d, Scanning: Select the starting detection area, such as... Figure 9 As shown, the adsorption-type scanning device 100 for generator retainer ring array eddy current detection is adsorbed and fixed on the engine retainer ring 6 (the suction cup 7 is adsorbed and fixed on the detection surface of the engine retainer ring), and the array eddy current probe 3 performs axial and circumferential scanning; the coverage area of ​​each scan by the array eddy current probe 3 should be greater than 15% of the effective detection range.

[0076] Step e: When inspecting the engine retaining ring, keep the scanning frequency of step b unchanged and increase the gain (increase by 10dB) to scan the engine retaining ring in a fixed scanning direction. Record the defects whose defect signal amplitude is greater than the defect signal amplitude of the required hole diameter (φ1.5).

[0077] During testing, the array eddy current probe 3 is held in hand and first subjected to axial testing. The array eddy current probe 3 is moved axially along the slide bar 53, ensuring good contact between the array eddy current probe 3 and the testing surface. The moving speed should not exceed 150 mm / s. After the axial testing is completed, the slide rail 51 is moved circumferentially, with a moving distance of 85% of the probe width, ensuring that the circumferential testing area is covered by 15% each time, before performing axial testing again.

[0078] Repeat the above steps to inspect the engine retainer ring, ensuring that the inspection area covers the entire outer surface of the retainer ring to complete the inspection of the entire retainer ring.

[0079] Step f, Defect Assessment: The inspection conclusion is unqualified if the following defects are found: the defect signal amplitude is greater than the defect signal amplitude of the (φ1.5) defect hole with the required aperture; the defect phase is greater than 30° from the phase of the (φ1.5) defect hole with the required aperture (calculated using the minimum angle, such as 0° and 359°, the phase difference is 1°); cracks are found.

[0080] Step g: If the array eddy current test result is unqualified, record the impedance diagram, C-scan diagram, and location of the defect.

[0081] As described above, the adsorption-type scanning device and detection method for eddy current detection of generator retaining ring array of the present invention have the following beneficial effects:

[0082] In the adsorption-type scanning device for generator retaining ring array eddy current testing of the present invention, the support frame, sliding structure, and probe clamping device work together to assist the array eddy current probe in scanning and testing. This ensures that the array eddy current probe is in close contact with the testing surface of the engine retaining ring, and the encoder is close to the outer surface of the retaining ring. This avoids deviations between the defect location in the testing data and the actual defect location caused by hand tremors or scanning route deviations, ensuring a precise correspondence between the scanning data location and the actual location. This allows for accurate positioning and quantification of the defect location, facilitating the assessment of the generator retaining ring's usage condition and safety performance. The generator retaining ring testing device based on array eddy current of the present invention is semi-automatic, making on-site installation and operation convenient, and offering high testing efficiency. Using the present invention for testing does not require removing the surface insulating varnish layer, thus avoiding damage to the varnish layer. Penetration and ultrasonic phased array testing, on the other hand, require the removal of the surface varnish layer. Using the present invention for testing can replace penetration testing and avoid the drawbacks of traditional eddy current testing, ensuring the correspondence between the testing data and the actual testing location, and achieving efficient, safe, and reliable testing of the generator retaining ring.

[0083] The above description is merely an illustrative embodiment of the present invention and is not intended to limit the scope of the invention. Any equivalent changes and modifications made by those skilled in the art without departing from the concept and principles of the present invention should fall within the scope of protection of the present invention.

Claims

1. An adsorption-type scanning device for eddy current detection of generator retaining ring array, characterized in that, The device includes a support frame that can be adsorbed onto an engine retainer ring. A sliding structure is provided on the support frame, and a probe clamping device is connected to the sliding structure, allowing it to move circumferentially and axially along the engine retainer ring. An array eddy current probe and an encoder are connected to the probe clamping device. The probe clamping device allows the array eddy current probe to abut against the detection surface of the engine retainer ring for surface defect detection. The array eddy current probe is used for detecting the detection surface of the engine retainer ring, and the encoder is used for recording the detection position, ensuring a one-to-one correspondence between the detection position and the probe detection data. The bottom of the support frame is equipped with multiple suction cups that can be attached to the engine guard ring; The sliding structure includes a circumferential sliding part and an axial sliding part. The circumferential sliding part includes a slide rail that can move circumferentially along the engine guard ring, and the slide rail is slidably connected to the support frame. The axial sliding part includes an axial support that is arranged axially along the engine guard ring. The axial support is fixedly connected to one end of the slide rail, and a slide rod is provided on the axial support. The probe clamping device is slidably connected to the slide rod. The support frame is provided with an arc-shaped slide channel, the slide rail slides through the slide channel, the slide rail is provided with a first rack arranged circumferentially along the engine guard ring, the support frame is provided with a first gear, and the first gear meshes with the first rack. The axial support is also connected to a support rod parallel to the slide rod, and a second rack is provided on the slide rod; the probe clamping device includes a main support, the main support includes a perforated plate, the perforated plate is slidably sleeved on the slide rod and the support rod; a second gear is hinged on the main support, and the second gear meshes with the second rack.

2. The adsorption-type scanning device for eddy current detection of generator retaining ring array as described in claim 1, characterized in that, The main support includes a fixing plate, and a probe connecting frame is elastically connected to the lower part of the fixing plate. The probe connecting frame is provided with a probe slot, and the array eddy current probe is fixedly connected in the probe slot. The encoder is connected to the outer side of the probe connecting frame.

3. The adsorption-type scanning device for eddy current detection of generator retaining ring array as described in claim 2, characterized in that, At least one axle pin extends upward from the top of the probe connecting frame. A through hole is provided on the fixing plate, through which the axle pin can slide. A spring is provided on the axle pin between the fixing plate and the probe connecting frame.

4. The adsorption-type scanning device for eddy current detection of generator retaining ring array as described in claim 3, characterized in that, A copper sleeve is provided inside the through hole, and the shaft pin slides through the copper sleeve.

5. The adsorption-type scanning device for eddy current detection of generator retaining ring array as described in claim 3, characterized in that, The probe connection frame is equipped with positioning bolts that can fix the array eddy current probe.

6. A detection method, characterized in that, Includes the following steps: Step a, Test block selection: Select a test block, and set at least one defect hole on the test block; Step b, Detection parameter selection and sensitivity adjustment: Select encoder recording mode for scanning record, select the corresponding frequency and gain to scan the test block, and identify the defect signal by adjusting the gain and phase. The defect hole should be clearly visible in the C-scan image. After the scan is completed, record the amplitude and phase of the defect signal of the defect hole at that gain and frequency; Step c: Assemble the adsorption-type scanning device for eddy current detection of generator retaining ring array as described in any one of claims 1 to 5; Step d, Scanning: Select the starting detection area, attach the generator retainer ring array eddy current detection adsorption scanning device to the engine retainer ring, and perform axial and circumferential scanning with the array eddy current probe; the coverage area of ​​each scan by the array eddy current probe should be greater than 15% of the effective detection range; Step e: When inspecting the engine retaining ring, keep the scanning frequency of step b unchanged and increase the gain to scan the engine retaining ring in a fixed scanning direction, and record the defects whose defect signal amplitude is greater than the defect signal amplitude of the required aperture. During testing, the array eddy current probe is held in hand and first axially inspected by moving the array eddy current probe along the axial direction of the engine retainer. After the axial inspection is completed, the array eddy current probe is moved circumferentially and then axially inspected again. The above actions are repeated to inspect the engine retainer to complete the inspection of the entire engine retainer. Step f, Defect assessment: The inspection conclusion is unqualified if the following defects are found: the defect signal amplitude is greater than the defect signal amplitude of the hole with the required diameter; The phase difference between the defect phase and the defect phase of the required aperture is greater than 30°; cracks appear. Step g: If the array eddy current test result is unqualified, record the impedance diagram, C-scan diagram, and location of the defect.

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