CN114813929A - Adsorption type scanning device and detection method for eddy current detection of generator retaining ring array - Google Patents

Abstract

The invention relates to an adsorption type scanning device for eddy current testing of a generator retaining ring array and a testing method, wherein the device comprises a support frame capable of being adsorbed on an engine retaining ring, a sliding structure is arranged on the support frame, and a probe clamping device capable of moving along the circumferential direction and the axial direction of the engine retaining ring is connected to the sliding structure; be connected with array eddy current probe and encoder on the probe clamping device, probe clamping device makes array eddy current probe can support to lean on the testing surface who contacts the engine retaining ring in order to carry out surface defect and detect, and array eddy current probe is used for the testing surface's of engine retaining ring detection, and the encoder is used for the record of testing position, makes testing position and probe test data one-to-one. The invention can accurately correspond the position of the scanned data to the actual position, accurately position and quantify the defect position, realize the high-efficiency, safe and accurate detection of the engine retaining ring and conveniently evaluate the use condition and the safety performance of the generator retaining ring correspondingly.

Description

Adsorption type scanning device and detection method for eddy current detection of generator retaining ring array

Technical Field

The invention relates to the technical field of detection of a generator retaining ring, in particular to an adsorption type scanning device and a detection method for eddy current detection of a generator retaining ring array.

Background

The generator retaining ring is an important part for protecting a generator rotor, and the electric arc may burn the generator retaining ring in the operation process to cause damage to the generator retaining ring and damage to the generator rotor. The material of the guard ring is 18Cr18Mn, and the metallographic structure is austenitic stainless steel and nonmagnetic.

The detection of its outer surface is now mainly a penetration detection. The labor intensity of the penetration detection is high, the reagent for the penetration detection is harmful to human bodies, the field cleaning work is complicated after the detection is finished, and the harmless treatment is needed because the detection reagent pollutes the environment. The four steps of applying penetrant, erasing surface penetrant, applying developer and observing in penetration detection are relatively high in working strength, the surface area of a generator guard ring is large, automatic equipment is difficult to use in the environment where a generator rotor is located, detection personnel are in direct contact with harmful detection reagents, and corresponding environmental pollution is caused by random discarding of containers of the detection reagents, so that the detection reagents and containers for containing the detection reagents may need special harmless treatment.

The generator retaining ring can theoretically detect by using eddy current because of no magnetism, but the traditional eddy current at the present stage can only detect by adopting a pen test probe, the detection contact area is small, the missed detection is easy to occur, and the time and the labor are consumed. The evaluation of defects is also not accurate enough. Therefore, the common vortex is rarely adopted to detect the guard ring at the present stage.

The array eddy current detection technology adopts the array sensors, can realize the rapid detection of the defects of the surface and the near surface of the component, can realize the high-speed measurement in a large area range without using a mechanical probe for scanning, can achieve the same measurement precision and resolution as those of a single sensor, and effectively improves the test speed, the measurement precision and the reliability of a sensor system.

In order to reduce labor intensity and reduce damage to a human body and pollution to the environment caused by detection work, array eddy current detection is a feasible direction for replacing penetration detection, the sensitivity of the array eddy current detection is high, the human body environment is harmless, other auxiliary medicines and reagents are not required for detection, the generator retaining ring can be subjected to paint detection, surface defects can be detected, and near surface defects can also be detected simultaneously.

During eddy current inspection, a probe is generally required to be held by a hand to scan the guard ring, a scanning position is recorded by an encoder, and a scanning result image is formed on an instrument.

Therefore, the inventor provides an adsorption type scanning device and a detection method for the eddy current detection of the generator retaining ring array by virtue of experience and practice of related industries for many years, so as to overcome the defects in the prior art.

Disclosure of Invention

The invention aims to provide an adsorption type scanning device and a detection method for eddy current detection of a generator retaining ring array, which can be used for avoiding the deviation between the defect position on detection data and the actual defect position caused by the problems of hand shaking, scanning route deviation and the like, enabling the scanning data position to accurately correspond to the actual position, accurately positioning and quantifying the defect position, realizing efficient, safe and accurate detection of the engine retaining ring and facilitating corresponding evaluation on the use condition and the safety performance of the generator retaining ring.

The invention aims to realize that the adsorption type scanning device for the eddy current testing of the generator retaining ring array comprises a support frame which can be adsorbed on an engine retaining ring, wherein a sliding structure is arranged on the support frame, and a probe clamping device which can move along the circumferential direction and the axial direction of the engine retaining ring is connected to the sliding structure; be connected with array eddy current probe and encoder on the probe clamping device, probe clamping device makes array eddy current probe can support to lean on the testing surface who contacts the engine retaining ring in order to carry out surface defect and detect, array eddy current probe is used for the testing surface's of engine retaining ring detection, the encoder is used for the record of testing position, makes testing position and probe test data one-to-one.

In a preferred embodiment of the present invention, the bottom of the supporting frame is provided with a plurality of suckers capable of being adsorbed on the engine retaining ring.

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 sliding rail capable of moving along a circumferential direction of the engine shroud ring, and the sliding rail is slidably connected to the support frame; the axial sliding part comprises an axial support arranged along the axial direction of the engine retaining ring, the axial support is fixedly connected to one end of the sliding rail, a sliding rod is arranged on the axial support, and the probe clamping device is connected to the sliding rod in a sliding mode.

In a preferred embodiment of the present invention, the support frame is provided with an arc-shaped sliding chute, the sliding rail is slidably disposed in the sliding chute, the sliding rail is provided with a first rack disposed along a circumferential direction of the engine guard ring, the support frame is provided with a first gear, and the first gear is engaged with the first rack.

In a preferred embodiment of the present invention, the axial bracket is further connected to a support rod parallel to the slide rod, and the slide rod is provided with a second rack; the probe clamping device comprises a main bracket, the main bracket comprises a pore plate, and the pore plate is sleeved on the sliding rod and the supporting rod in a sliding manner; and the main bracket is hinged with a second gear, and the second gear is meshed with the second rack.

In a preferred embodiment of the present invention, the main bracket includes a fixed plate, a probe connecting frame is elastically connected below the fixed plate, a probe slot is disposed on the probe connecting frame, and the array eddy current probe is fixedly connected in the probe slot; the outer side surface of the probe connecting frame is connected with the encoder.

In a preferred embodiment of the present invention, at least one shaft pin extends upward from the top of the probe connecting frame, a through hole is formed in the fixing plate, the shaft pin slidably penetrates through the through hole, and a spring is disposed on the shaft pin between the fixing plate and the probe connecting frame.

In a preferred embodiment of the present invention, a copper sleeve is disposed in the through hole, and the shaft pin is slidably inserted through the copper sleeve.

In a preferred embodiment of the present invention, the probe connecting frame is provided with a positioning bolt capable of fixing the array eddy current probe.

The object of the invention is also achieved in that a detection method comprises the following steps:

step a, detection test block selection: selecting a detection test block, and arranging at least one defect hole on the detection test block;

step b, detection parameter selection and sensitivity adjustment: scanning record and selecting an encoder recording mode, selecting a corresponding frequency and gain to scan a detection test block, identifying a defect signal by adjusting gain and phase, and clearly seeing a defect hole in a C scanning image; recording the amplitude and the phase of the defect signal of the defect hole under the gain and the frequency after scanning;

step c, assembling the adsorption type scanning device for the eddy current detection of the generator retaining ring array;

step d, scanning: selecting a starting detection area, fixing an adsorption type scanning device for the eddy current detection of the generator retaining ring array on the engine retaining ring in an adsorption manner, and scanning the array eddy current probe in the axial direction and the circumferential direction; the coverage area of each scanning of the array eddy current probe is more than 15% of the effective detection range;

e, when the engine retaining ring is inspected, keeping the scanning frequency of the step b unchanged and increasing the gain, scanning the engine retaining ring in a fixed scanning direction, and recording the defect that the defect signal amplitude is larger than that of the defect hole with the required aperture;

during detection, the array eddy current probe is held by a hand to perform axial detection, and the array eddy current probe moves along the axial direction of the engine retaining ring; after the axial detection is finished, moving the array eddy current probe along the circumferential direction, and then carrying out the axial detection; repeating the above actions to detect the engine retaining ring so as to complete the detection of the whole engine retaining ring;

step f, defect assessment: the following defects appear and the inspection conclusion is unqualified: the defect signal amplitude is greater than the defect signal amplitude of the defect hole with the required aperture; the phase difference between the defect and the defect hole with the required aperture is more than 30 degrees; the occurrence of cracks;

and g, when the array eddy current inspection conclusion is unqualified, recording an impedance graph and a C scanning graph of the defect and the position of the defect.

From the above, the adsorption type scanning device and the detection method for the eddy current detection of the generator retaining ring array have the following beneficial effects:

in the adsorption type scanning device for the eddy current detection of the generator retaining ring array, the support frame, the sliding structure and the probe clamping device are matched to assist the scanning detection of the array eddy current probe, so that the array eddy current probe can be tightly attached to the detection surface of the engine retaining ring, and the encoder is tightly attached to the outer surface of the retaining ring, thereby avoiding the deviation between the defect position on the detection data and the actual defect position caused by the problems of hand shake, scanning route deviation and the like, enabling the scanned data position to accurately correspond to the actual position, accurately positioning and quantifying the defect position, and facilitating the corresponding evaluation of the use condition and the safety performance of the generator retaining ring; the generator retaining ring detection device based on the array eddy current is semi-automatic, is convenient to install and operate on site, and has high detection efficiency; the method does not need to remove the surface insulating paint layer during detection, does not damage the paint layer, and needs to remove the surface paint layer during penetration and ultrasonic phased array detection; the invention can replace penetration detection, avoid the defects of the traditional eddy current, ensure the corresponding relation between detection data and actual detection positions and realize the high-efficiency, safe and reliable detection of the generator retaining ring.

Drawings

The drawings are only for purposes of illustrating and explaining the present invention and are not to be construed as limiting the scope of the present invention. Wherein:

FIG. 1: the invention is a schematic diagram of an adsorption type scanning device for eddy current testing of a generator retaining ring array.

FIG. 2: the invention relates to a side view of an adsorption type scanning device for eddy current testing of a generator retaining ring array.

FIG. 3: the invention is a front view of the adsorption type scanning device for the eddy current detection of the generator retaining ring array.

FIG. 4: is a schematic view of the support frame of the present invention.

FIG. 5: is a schematic view of the probe gripping apparatus of the present invention.

FIG. 6: is a side view of the probe gripping device of the present invention.

FIG. 7: is a front view of the probe gripping device of the present invention.

FIG. 8: is a schematic diagram of the test block of the present invention.

FIG. 9: the invention is a schematic diagram of the detection state of the adsorption type scanning device for the eddy current detection of the generator retaining ring array.

In the figure:

100. an adsorption type scanning device for eddy current detection of a generator retaining ring array;

1. a support frame;

10. a chute channel; 11. a first gear; 12. a side vertical plate; 13. a support beam;

2. a probe clamping device;

21. a main support; 22. an orifice plate; 23. a second gear; 24. a fixing plate; 25. a probe connecting frame; 251. a probe card slot; 26. a shaft pin; 27. a spring; 28. a copper sleeve; 29. positioning the bolt;

3. an array eddy current probe;

4. an encoder;

5. a sliding structure;

51. a slide rail; 511. a first rack; 52. an axial support; 53. a slide bar; 531. a second rack; 54. a support bar;

6. an engine retaining ring;

7. a suction cup;

8. detecting a test block; 81. defective cells.

Detailed Description

In order to more clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will now be described with reference to the accompanying drawings.

The specific embodiments of the present invention described herein are for the purpose of illustration only and are not to be construed as limiting the invention in any way. Any possible variations based on the present invention may be conceived by the skilled person in the light of the teachings of the present invention, and these should be considered to fall within the scope of the present invention. It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "mounted," "connected," and "connected" are to be construed broadly and may include, for example, mechanical or electrical connections, communications between two elements, direct connections, indirect connections through intermediaries, and the like. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

Unless defined otherwise, 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 in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

As shown in fig. 1 to 9, the present invention provides an adsorption type scanning device 100 for eddy current testing of a generator retaining ring array, which includes a support frame 1 capable of being adsorbed on an engine retaining ring 6, wherein a sliding structure 5 is arranged on the support frame 1, and a probe clamping device 2 capable of moving along the circumferential direction and the axial direction of the engine retaining ring is connected to the sliding structure 5; be connected with array eddy current probe 3 and encoder 4 on the probe clamping device 2, probe clamping device 2 makes array eddy current probe 3 can support to lean on the detection surface who contacts the engine retaining ring in order to carry out surface defect and detect, and array eddy current probe 3 is used for the detection of the detection surface of engine retaining ring, and encoder 4 is used for the record of detection position, makes detection position and probe detection data one-to-one.

Ultrasonic phased array inspection is an acoustic inspection method based on ultrasound. The array eddy current is a detection method based on electromagnetic induction, a conductor is close to a coil which is communicated with alternating current, an alternating magnetic field is established by the coil, the alternating magnetic field passes through a conductor and generates electromagnetic induction with the conductor, and eddy current is established in the conductor. The eddy current in the conductor can also generate a magnetic field of the conductor, and the strength of the original magnetic field is changed by the action of the eddy current magnetic field, so that the voltage and the impedance of the coil are changed. When the surface or the near surface of the conductor has defects, the intensity and the distribution of eddy current are influenced, the change of the eddy current causes the change of the voltage and the impedance of the detection coil, and the existence of the defects in the conductor can be indirectly known according to the change. The array eddy current detection technology adopts the array sensors, can realize the rapid detection of the defects of the surface and the near surface of the component, can realize the high-speed measurement in a large area range without using a mechanical probe for scanning, can achieve the same measurement precision and resolution as those of a single sensor, and effectively improves the test speed, the measurement precision and the reliability of a sensor system.

The ultrasonic phased array is used for detecting the internal defects of the guard ring, and because the surface and near-surface defects of the guard ring cannot be detected due to the existence of the blind area of the phased array probe, the array eddy current mainly detects the surface and near-surface defects of the guard ring.

In the adsorption type scanning device for the eddy current detection of the generator retaining ring array, the support frame, the sliding structure and the probe clamping device are matched to assist the scanning detection of the array eddy current probe, so that the array eddy current probe can be tightly attached to the detection surface of the engine retaining ring, and the encoder is tightly attached to the outer surface of the retaining ring, thereby avoiding the deviation between the defect position on the detection data and the actual defect position caused by the problems of hand shake, scanning route deviation and the like, enabling the scanned data position to accurately correspond to the actual position, accurately positioning and quantifying the defect position, and facilitating the corresponding evaluation of the use condition and the safety performance of the generator retaining ring; the generator retaining ring detection device based on the array eddy current is semi-automatic, is convenient to install and operate on site, and has high detection efficiency; the method does not need to remove the surface insulating paint layer during detection, does not damage the paint layer, and needs to remove the surface paint layer during penetration and ultrasonic phased array detection; the invention can replace penetration detection, avoid the defects of the traditional eddy current, ensure the corresponding relation between detection data and actual detection positions and realize the high-efficiency, safe and reliable detection of the generator retaining ring.

Further, as shown in fig. 1, 2, 3, and 4, a plurality of suction cups 7 capable of being attached to the engine shroud ring 6 are provided at the bottom of the support frame 1. In a specific embodiment of the invention, the number of the suckers 7 is 4, the suckers 7 are hand-pressed type suckers, the safety is high, the absorption and detachment operation is convenient, and the suckers 7 are used for fixing the support frame 1 on the engine guard ring 6 in an absorption manner.

Further, as shown in fig. 1, 2, and 3, the sliding structure 5 includes a circumferential sliding portion and an axial sliding portion, the circumferential sliding portion includes a sliding rail 51 capable of moving along the circumferential direction of the engine shroud ring, and the sliding rail 51 is slidably connected to the support frame 1; the axial sliding part comprises an axial support 52 arranged along the axial direction of the engine retaining ring, the axial support 52 is fixedly connected to one end of the sliding rail 51, a sliding rod 53 is arranged on the axial support 52, and the probe clamping device 2 is connected to the sliding rod 53 in a sliding mode. The slide rail 51 is used for driving the array eddy current probe 3 to circumferentially slide so as to complete the scanning of the array eddy current probe 3 on the engine shroud ring 6.

Further, as shown in fig. 1 and 4, an arc-shaped sliding chute 10 is arranged on the support frame 1, the sliding rail 51 is slidably inserted into the sliding chute 10, a first rack 511 arranged along the circumferential direction of the engine guard ring is arranged on the sliding rail 51, a first gear 11 is arranged on the support frame 1, and the first gear 11 is engaged with the first rack 511. The first gear 11 supports the slide rail 51 to slide.

In the present embodiment, as shown in fig. 4, the supporting frame 1 includes two side vertical plates 12 arranged in parallel at intervals, and a suction cup 7 is respectively installed at the bottom of each of the two ends of each side vertical plate 12; the chute channel 10 is arranged on the outer side surface of each side vertical plate 12, and each side vertical plate 12 is respectively hinged with a first gear 11; a plurality of supporting beams 13 are fixedly connected between the two side vertical plates 12, and the supporting beams 13 are used for supporting the side vertical plates 12, so that the whole device is stable in structure.

Further, as shown in fig. 1, 2 and 3, the axial bracket 52 is further connected with a support rod 54 parallel to the slide rod 53, and the slide rod 53 is provided with a second rack 531; the probe clamping device 2 comprises a main bracket 21, wherein the main bracket 21 comprises a pore plate 22, and the pore plate 22 is slidably sleeved on a sliding rod 53 and a supporting rod 54; the main bracket 21 is hinged with a second gear 23, and the second gear 23 is meshed with the second rack 531. The slide bar 53 and the support bar 54 support the array eddy current probe 3 in a matching manner, so that the array eddy current probe 3 slides stably along the axial direction.

Further, as shown in fig. 5, 6 and 7, the main support 21 includes a fixing plate 24, a probe connecting frame 25 is elastically connected below the fixing plate 24, a probe slot 251 is arranged on the probe connecting frame 25, and the array eddy current probe 3 is fixedly connected in the probe slot 251; the outer side surface of the probe connecting frame 25 is connected with the encoder 4.

Further, as shown in fig. 5, 6 and 7, at least one shaft pin 26 is extended upward from the top of the probe connecting frame 25, a through hole is formed in the fixing plate 24, the shaft pin 26 is slidably inserted through the through hole, and a spring 27 is disposed on the shaft pin 26 between the fixing plate 24 and the probe connecting frame 25. The spring 27 is used to apply a pressure to the array eddy current probe 3 against the inspection surface of the engine shroud (the shroud surface) at all times during inspection.

Further, as shown in fig. 5, 6 and 7, a copper sleeve 28 is arranged in the through hole, and the shaft pin 26 is slidably inserted through the copper sleeve 28.

Further, as shown in fig. 5, 6, and 7, the probe attachment frame 25 is provided with a positioning bolt 29 capable of fixing the array eddy current probe.

The array eddy current probe 3 is connected in the probe clamping groove 251 of the probe connecting frame 25, and then the positioning bolt 29 is screwed to fix the array eddy current probe 3. The encoder is also secured to the probe attachment bracket 25 with a set screw.

The invention also provides a detection method, which comprises the following steps:

step a, selecting a detection test block 8: selecting a detection test block 8, and as shown in fig. 8, arranging at least one defect hole 81 on the detection test block 8;

the detection test block 8 is made of a material similar to or the same as that of the detected guard ring; three through holes with the diameter of 1.5mm, the diameter of 2mm and the diameter of 3mm are processed on the detection test block 5, the aperture error is not more than +/-0.02 mm, the perpendicularity deviation of the holes is not more than 0.1 degrees, and other dimensional errors are not more than +/-0.05 mm. The defective holes with three apertures represent different sensitivities, which can be selected according to technical requirements, and in a specific embodiment of the invention, the detection is performed according to the sensitivity of the defective holes with the holes of phi 1.5 mm.

Step b, detection parameter selection and sensitivity adjustment: scanning record and selecting an encoder recording mode, selecting a corresponding frequency and gain to scan a detection test block, identifying a defect signal by adjusting gain and phase, and clearly seeing a defect hole in a C scanning image; recording the amplitude and the phase of the defect signal of the defect hole under the gain and the frequency after scanning;

step c, assembling the adsorption type scanning device 100 for the eddy current testing of the generator retaining ring array: connecting the array eddy current probe 3 and the encoder 4 to the probe clamping device 2, connecting the probe clamping device 2 to the support frame 1, and adjusting the array eddy current probe 3 and the encoder 4;

step d, scanning: selecting an initial detection area, and as shown in fig. 9, fixing the adsorption type scanning device 100 for eddy current detection of the generator retaining ring array on the engine retaining ring 6 (the suction disc 7 is fixed on the detection surface of the engine retaining ring) in an adsorption manner, and scanning the array eddy current probe 3 in the axial direction and the circumferential direction; the coverage area of the array eddy current probe 3 in each scanning is more than 15% of the effective detection range.

Step e, when the engine retaining ring is inspected, keeping the scanning frequency of the step b unchanged and increasing the gain (by 10dB), scanning the engine retaining ring in a fixed scanning direction, and recording the defect that the defect signal amplitude is greater than the defect signal amplitude of the defect hole (phi 1.5) with the required aperture;

during detection, the array eddy current probe 3 is held by a hand to perform axial detection, the array eddy current probe 3 moves axially along the sliding rod 53, the array eddy current probe 3 is ensured to be well matched with a detection surface during detection, and the moving speed is not more than 150 mm/s. After the axial detection is finished, the sliding rail 51 is moved along the circumferential direction, the moving distance is 85% of the width of the probe, the coverage of each detection area in the circumferential direction is ensured to be 15%, and then the axial detection is carried out.

And repeating the actions to detect the engine retaining ring, and ensuring that the detection area covers the outer surface of the whole retaining ring so as to finish the detection of the whole retaining ring.

Step f, defect assessment: the following defects appear and the inspection conclusion is unqualified: the defect signal amplitude is greater than the defect signal amplitude of the defect hole (phi 1.5) with the required aperture; the phase of the defect is different from that of the defect hole with the required aperture (phi 1.5) by more than 30 degrees (calculated by a minimum angle, such as the phase difference between 0 degrees and 359 degrees is 1 degree); the occurrence of cracks;

and g, when the array eddy current inspection conclusion is unqualified, recording an impedance graph and a C scanning graph of the defect and the position of the defect.

From the above, the adsorption type scanning device and the detection method for the eddy current detection of the generator retaining ring array have the following beneficial effects:

in the adsorption type scanning device for the eddy current detection of the generator retaining ring array, the support frame, the sliding structure and the probe clamping device are matched to assist the scanning detection of the array eddy current probe, so that the array eddy current probe can be tightly attached to the detection surface of the engine retaining ring, and the encoder is tightly attached to the outer surface of the retaining ring, thereby avoiding the deviation between the defect position on the detection data and the actual defect position caused by the problems of hand shake, scanning route deviation and the like, enabling the scanned data position to accurately correspond to the actual position, accurately positioning and quantifying the defect position, and facilitating the corresponding evaluation of the use condition and the safety performance of the generator retaining ring; the generator retaining ring detection device based on the array eddy current is semi-automatic, is convenient to install and operate on site, and has high detection efficiency; the method does not need to remove the surface insulating paint layer during detection, does not damage the paint layer, and needs to remove the surface paint layer during penetration and ultrasonic phased array detection; the invention can replace penetration detection, avoid the defects of the traditional eddy current, ensure the corresponding relation between detection data and actual detection positions and realize the high-efficiency, safe and reliable detection of the generator retaining ring.

The above description is only an exemplary embodiment of the present invention, and is not intended to limit the scope of the present invention. Any equivalent changes and modifications that can be made by one skilled in the art without departing from the spirit and principles of the invention should fall within the protection scope of the invention.

Claims (10)

1. An adsorption type scanning device for eddy current testing of a generator retaining ring array is characterized by comprising a support frame capable of being adsorbed on an engine retaining ring, wherein a sliding structure is arranged on the support frame, and a probe clamping device capable of moving along the circumferential direction and the axial direction of the engine retaining ring is connected to the sliding structure; be connected with array eddy current probe and encoder on the probe clamping device, probe clamping device makes array eddy current probe can support to lean on the testing surface who contacts the engine retaining ring in order to carry out surface defect and detect, array eddy current probe is used for the testing surface's of engine retaining ring detection, the encoder is used for the record of testing position, makes testing position and probe test data one-to-one.

2. The absorption type scanning device for the eddy current testing of the generator retaining ring array as claimed in claim 1, wherein a plurality of suckers capable of being absorbed on the engine retaining ring are arranged at the bottom of the supporting frame.

3. The absorption type scanning device for the eddy current testing of the generator retaining ring array as claimed in claim 1, wherein the sliding structure comprises a circumferential sliding part and an axial sliding part, the circumferential sliding part comprises a sliding rail capable of moving along the circumferential direction of the engine retaining ring, and the sliding rail is slidably connected to the supporting frame; the axial sliding part comprises an axial support arranged along the axial direction of the engine retaining ring, the axial support is fixedly connected to one end of the sliding rail, a sliding rod is arranged on the axial support, and the probe clamping device is connected to the sliding rod in a sliding mode.

4. The absorption type scanning device for the eddy current testing of the generator guard ring array according to claim 3, wherein the support frame is provided with an arc-shaped sliding groove, the sliding rail is slidably disposed in the sliding groove, the sliding rail is provided with a first rack disposed along the circumferential direction of the engine guard ring, the support frame is provided with a first gear, and the first gear is engaged with the first rack.

5. The absorption type scanning device for the eddy current testing of the generator retaining ring array as claimed in claim 3, wherein a support rod parallel to the slide rod is further connected to the axial bracket, and a second rack is arranged on the slide rod; the probe clamping device comprises a main bracket, the main bracket comprises a pore plate, and the pore plate is sleeved on the sliding rod and the supporting rod in a sliding manner; and the main bracket is hinged with a second gear, and the second gear is meshed with the second rack.

6. The absorption type scanning device for the eddy current testing of the generator shroud ring array of claim 5, wherein the main bracket comprises a fixed plate, a probe connecting frame is elastically connected below the fixed plate, a probe clamping groove is formed in the probe connecting frame, and the array eddy current probe is fixedly connected in the probe clamping groove; the outer side surface of the probe connecting frame is connected with the encoder.

7. The absorption type scanning device for eddy current testing of the generator guard ring array as claimed in claim 6, wherein at least one shaft pin is extended upward from the top of the probe connection frame, a through hole is formed in the fixing plate, the shaft pin is slidably inserted through the through hole, and a spring is disposed on the shaft pin between the fixing plate and the probe connection frame.

8. The absorption type scanning device for the eddy current testing of the generator guard ring array as claimed in claim 7, wherein a copper sleeve is arranged in the through hole, and the shaft pin is slidably inserted through the copper sleeve.

9. The absorption type scanning device for the eddy current testing of the generator retaining ring array as claimed in claim 7, wherein a positioning bolt capable of fixing the array eddy current probe is arranged on the probe connecting frame.

10. A method of detection, comprising the steps of:

step a, detection test block selection: selecting a detection test block, wherein at least one defect hole is formed in the detection test block;

step b, detection parameter selection and sensitivity adjustment: scanning record and selecting an encoder recording mode, selecting a corresponding frequency and gain to scan a detection test block, identifying a defect signal by adjusting gain and phase, and clearly seeing a defect hole in a C scanning image; recording the amplitude and the phase of the defect signal of the defect hole under the gain and the frequency after scanning;

step c, assembling the adsorption type scanning device for the eddy current testing of the generator retaining ring array according to any one of claims 1 to 9;

step d, scanning: selecting a starting detection area, fixing an adsorption type scanning device for the eddy current detection of the generator retaining ring array on the engine retaining ring in an adsorption manner, and scanning the array eddy current probe in the axial direction and the circumferential direction; the coverage area of each scanning of the array eddy current probe is more than 15% of the effective detection range;

e, when the engine retaining ring is inspected, keeping the scanning frequency of the step b unchanged and increasing the gain, scanning the engine retaining ring in a fixed scanning direction, and recording the defect that the defect signal amplitude is larger than that of the defect hole with the required aperture;

during detection, the array eddy current probe is held by a hand to perform axial detection, and the array eddy current probe moves along the axial direction of the engine retaining ring; after the axial detection is finished, moving the array eddy current probe along the circumferential direction, and then carrying out the axial detection; repeating the above actions to detect the engine retaining ring so as to complete the detection of the whole engine retaining ring;

step f, defect assessment: the following defects appear and the inspection conclusion is unqualified: the defect signal amplitude is greater than the defect signal amplitude of the defect hole with the required aperture; the phase difference between the defect and the defect hole with the required aperture is more than 30 degrees; the occurrence of cracks;

and g, when the array eddy current inspection conclusion is unqualified, recording an impedance graph and a C scanning graph of the defect and the position of the defect.

Images