Multi-excitation source pulse modulation eddy current aviation metal corrosion defect detection device and method

Abstract

The invention discloses a multi-excitation-source pulse modulation eddy current aviation metal corrosion defect detection device and method, and belongs to the technical field of aviation. The problems that in existing detection, a rigid probe does not adapt to the curved surface of an aviation component, lift-off distances are inconsistent, errors are caused, device position adjustment is not flexible, and the distance between detection mechanisms is difficult to adjust are solved. The device comprises a detection platform, a detection mechanism and an adjusting mechanism. The detection mechanism comprises a main mounting plate, a cylindrical block, a sheath and a micro excitation coil; the sheath is connected with the main mounting plate through a connecting mechanism with a universal joint I, a universal joint II and a sliding inner rod; the adjusting mechanism comprises a transverse adjusting frame, a longitudinal adjusting frame, a front-back adjusting frame and a moving table. The distance between the detection mechanisms can be adjusted through an operation plate, a sliding circular plate and a positioning rod. A plurality of sheaths can automatically adapt to the surface of aviation metal, and when uneven surfaces such as rivets are scanned, even if part of the sheaths are jacked up, other sheaths can still keep good contact, so that the detection blind area and the lift-off effect are reduced to the greatest extent.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of aviation technology, in particular to a multi-excitation source pulse modulation eddy current aviation metal corrosion defect detection device and method. BACKGROUND

[0002] In the field of aviation, the quality and safety of aviation metal components are of great importance. Aviation metals are susceptible to various environmental factors such as corrosion and fatigue during long-term use, which can cause defects in metal components and seriously affect the flight safety of aircraft. Therefore, regular corrosion defect detection of aviation metals is an important link to ensure aviation safety.

[0003] Currently, the commonly used aviation metal corrosion defect detection methods have certain limitations. Traditional detection probes are mostly rigid structures, which are difficult to adapt to the common curved surface changes of aviation components. In actual detection, the surface of aviation metal often has various uneven conditions such as rivets. When the rigid probe contacts the surface of aviation metal, it will cause the lift-off distance of each excitation source from the detection surface to be inconsistent, thereby introducing detection errors and affecting the accuracy of the detection results.

[0004] In addition, the existing detection devices also have shortcomings in adjusting the detection position and adapting to different aviation metals. The position adjustment of the detection device is not flexible enough to achieve omnidirectional detection of aviation metals. For aviation metals of different sizes and shapes, it is difficult to conveniently adjust the distance between the detection mechanisms, resulting in poor detection applicability. SUMMARY

[0005] The purpose of the present application is to solve the problem of the traditional detection probe being mostly rigid structure, which is difficult to adapt to the common curved surface changes of aviation components, and the shortcomings of the existing detection devices in adjusting the detection position and adapting to different aviation metals.

[0006] In order to achieve the above purpose, the present application adopts the following technical scheme:

[0007] The multi-excitation source pulse modulation eddy current aviation metal corrosion defect detection device comprises a detection platform, the detection platform is used for placing aviation metal, and the bottom of the detection platform is fixedly connected with supporting legs;

[0008] A detection mechanism is used for detecting corrosion defects of aviation metal, and the detection mechanism comprises a main mounting plate, a plurality of strip-shaped holes are formed in the inside of the main mounting plate, a cylindrical block is slidably connected in the inside of the strip-shaped hole, a mounting disc II is fixedly connected to the bottom of the cylindrical block, a protective sleeve is detachably connected to the bottom of the mounting disc II through a connecting mechanism, and a plurality of groups of micro-excitation coils are arranged in the inside of the protective sleeve.

[0009] Adjusting mechanism, adjusting mechanism is arranged on the top of the detection platform, and be used for adjusting the detection mechanism position, the connecting mechanism includes universal joint and sliding assembly, make the sheath can automatically adapt to the surface of the aviation metal surface change, when scanning uneven surface, part of the sheath is lifted when other sheath keeps contact, reduce the detection blind area.

[0010] In a possible design, the detection mechanism further comprises a fixed shaft, the top and bottom of the fixed shaft are fixedly connected with sliding round plates, the bottom of the sliding round plate located below is fixedly connected with the top of the cylindrical block, a side of the sliding round plate is provided with two symmetrically arranged rectangular grooves, the sliding convex plate is slidably connected in the rectangular groove, the compression spring II is arranged between a side of the sliding convex plate and an inner wall of a side of the rectangular groove, the sliding convex plate is fixedly connected with two symmetrically arranged positioning rods on one side, a plurality of accommodation holes are formed in a side of the sliding round plate, one end of the positioning rod slidably penetrates the accommodation hole, the positioning rod is engaged or separated from the positioning groove through the elastic force of the compression spring II, so that the sliding round plate is braked or released.

[0011] In a possible design, the two side inner walls of the strip-shaped hole are provided with side edge grooves, the top inner wall and the bottom inner wall of the side edge groove are provided with a plurality of positioning grooves, the sliding round plate is slidably connected in the interior of the side edge groove, the positioning rod is engaged with the positioning groove, and the engagement of the positioning rod and the positioning groove ensures the stability of the detection position and avoids displacement error in the detection process.

[0012] In a possible design, the interior of the sliding round plate located above is provided with two arc-shaped holes, the two arc-shaped holes are centrally and symmetrically arranged, the top of the sliding round plate is rotatably connected with a connecting round plate, the top of the connecting round plate is fixedly connected with an operation plate, the bottom of the connecting round plate is fixedly connected with two vertical rods, the bottom of the vertical rod penetrates the arc-shaped hole and is fixedly connected with a pushing convex plate, one side of the sliding convex plate is arc-shaped, one side of the pushing convex plate is arc-shaped, the pushing convex plate is used in cooperation with the sliding convex plate, the operation plate is rotated to drive the pushing convex plate to rotate through the vertical rod, the arc-shaped surface of the pushing convex plate interacts with the arc-shaped surface of the sliding convex plate, so that the sliding convex plate moves and drives the positioning rod to be separated from the positioning groove.

[0013] In a possible design, the adjusting mechanism comprises a fixed support plate fixedly connected to the top of the detection platform, one side of the fixed support plate is fixedly connected with a mounting rack, one side of the mounting rack is fixedly connected with a transverse adjusting frame, one side of the transverse adjusting frame is slidingly connected with a longitudinal adjusting frame, one side of the longitudinal adjusting frame is slidingly connected with a front-back adjusting frame, the top of the front-back adjusting frame is slidingly connected with a moving table, one side of the moving table is fixedly connected with a connecting bracket, and the bottom of the connecting bracket is fixedly connected with the top of the main mounting plate. The transverse position is adjusted by moving the longitudinal adjusting frame on the transverse adjusting frame, the longitudinal height is adjusted by moving the front-back adjusting frame on the longitudinal adjusting frame, and the front-back position is adjusted by moving the moving table on the front-back adjusting frame, so that the detection mechanism is positioned in all directions.

[0014] In a possible design, the connecting mechanism comprises a mounting disc I, the mounting disc I and a mounting disc II are threadedly connected, the bottom of the mounting disc I is provided with a universal joint I, the bottom of the universal joint I is fixedly connected with a connecting sleeve I, the bottom of the connecting sleeve I is fixedly connected with a sliding inner rod, the outer wall of the sliding inner rod is slidingly sleeved with a connecting sleeve II, the bottom of the connecting sleeve II is provided with a universal joint II, and the bottom of the universal joint II is fixedly connected with a support bottom plate. The universal joint I and the universal joint II provide multiple rotation degrees of freedom, and the sliding fit of the sliding inner rod and the connecting sleeve II provides axial extension and retraction freedom, so that the sheath is self-adaptable to the curved surface change.

[0015] In a possible design, the bottom of the support bottom plate is provided with a threaded groove, the top of the sheath is fixedly connected with a connecting screw rod, and the connecting screw rod is threadedly connected with the threaded groove. The sheath can be detachably replaced through the threaded connection, so that the sheath is convenient to maintain and adapt to different detection requirements.

[0016] In a possible design, a compression spring I is arranged between the bottom of the sliding inner rod and the inner wall of the bottom of the connecting sleeve II, the compression spring I provides elastic buffering, ensures that the sheath is in flexible contact with the aviation metal surface, and reduces the fluctuation of the lifting distance.

[0017] A multi-excitation source pulse modulation eddy current aviation metal corrosion defect detection method, comprising the following steps:

[0018] S1: placing the aviation metal to be detected on the top of the detection platform, ensuring that the aviation metal surface is not blocked and is placed stably;

[0019] S2: adjusting the position of the detection mechanism through the adjusting mechanism, specifically: sliding the longitudinal adjusting frame along the transverse adjusting frame to adjust the transverse position of the main mounting plate; sliding the front-back adjusting frame along the longitudinal adjusting frame to adjust the longitudinal height of the main mounting plate; sliding the moving table along the front-back adjusting frame to adjust the front-back position of the main mounting plate, so that the sheath below the main mounting plate is aligned with the detection area of the aviation metal;

[0020] S3: According to the size of the aviation metal, adjust the spacing of the connecting mechanism: rotate the operation plate to drive the connecting round plate and the vertical rod to rotate, make the push convex plate turn out from the two sliding convex plates to the outside, the sliding convex plate moves under the elastic force of the compression spring II, the positioning rod moves out of the positioning groove; push the sliding round plate to slide along the side groove, adjust the position of the cylindrical block in the strip-shaped hole, and then change the spacing between the multiple sheaths; after the spacing adjustment is completed, reverse the operation plate, push the two sliding convex plates to move close to each other, and the positioning rod re-enters the positioning groove to fix the position of the sliding round plate;

[0021] S4: Start detection, apply pulse current through the micro excitation coil inside the sheath, the magnetic field generated by the pulse current induces eddy current inside the aviation metal, during the detection process, the sheath realizes turning through the universal joint I and the universal joint II of the connecting mechanism, the sliding inner rod slides along the connecting sleeve II, so that multiple sheaths automatically adapt to the curved surface or uneven surface of the aviation metal, and maintain good contact with the surface of the aviation metal;

[0022] S5: Detect the change data of the eddy current field, according to the amplitude and distribution law of the change of the eddy current field, evaluate whether there is corrosion defect inside the aviation metal and the position and size of the defect.

[0023] In this application, when in use, the aviation metal to be detected is placed on the top of the detection platform, the longitudinal adjusting frame is moved on the transverse adjusting frame to adjust the transverse position of the main mounting plate, the front and rear adjusting frames are moved on the longitudinal adjusting frame to adjust the longitudinal height of the main mounting plate, and the moving table is moved on the surface of the front and rear adjusting frames to adjust the front and rear position of the main mounting plate, so that the main mounting plate can detect the aviation metal in all directions;

[0024] At this time, multiple sheaths can be attached to the surface of the aviation metal, avoiding the difficulty of the rigid structure of the probe to adapt to the common curved surface change of the aviation component, leading to inconsistent lifting distance of each excitation source from the detection surface, introducing detection error, the flexibility of the universal joint I and the universal joint II can realize turning, the sliding setting of the sliding inner rod and the connecting sleeve II can make the sheaths at different positions appropriately elongate, and then multiple sheaths can automatically adapt to the surface of the aviation metal, when scanning the uneven surface such as rivets, part of the sheaths may be lifted, but other sheaths can still maintain good contact, which maximizes the detection blind area, by applying pulse current to the aviation metal to be detected on the detection platform, eddy current is induced in the metal material, and the material integrity is evaluated by detecting the change of the eddy current field;

[0025] And because multiple connecting mechanisms are arranged in a ring shape, the distance between multiple connecting mechanisms can be adjusted according to different aviation metals. Specifically, the operating plate is rotated to drive the connecting disc to rotate, the connecting disc drives the vertical rod to rotate, and the vertical rod drives the pushing protruding plate to rotate. At this time, the pushing protruding plate is turned out from between the two sliding protruding plates to the outside, and the sliding protruding plates move under the elastic force of the compression spring II, and the positioning rod moves out from the inside of the positioning groove, thereby releasing the braking state of the device. The position of the sliding disc can be adjusted. After adjustment is completed, the operating plate is reversed again to help the two sliding protruding plates move away again, thereby changing the position of the sliding disc and realizing the change of the distance between multiple connecting mechanisms, which is convenient to use.

[0026] Beneficial effects: In the multi-excitation source pulse modulation eddy current aviation metal corrosion defect detection device, the sheath is connected with the main mounting plate through the connecting mechanism, the connecting mechanism includes universal joint I and universal joint II, and the flexibility thereof can realize turning. At the same time, the sliding inner rod and the sliding setting of the connecting sleeve II enable the sheaths at different positions to be appropriately elongated. This structure enables multiple sheaths to automatically adapt to the surface of aviation metal. When scanning uneven surfaces such as rivets, even if part of the sheaths are lifted, the other sheaths can still maintain good contact, thereby minimizing the detection blind area and improving the detection accuracy.

[0027] The adjusting mechanism is arranged on the top of the detection platform. The longitudinal adjusting frame moves on the transverse adjusting frame to adjust the transverse position of the main mounting plate. The front and rear adjusting frames move on the longitudinal adjusting frame to adjust the longitudinal height of the main mounting plate. The moving table moves on the surface of the front and rear adjusting frames to adjust the front and rear position of the main mounting plate. This multi-directional adjusting mode enables the main mounting plate to detect aviation metal in all directions, thereby improving the comprehensiveness and efficiency of detection.

[0028] Multiple connecting mechanisms are arranged in a ring shape, and the distance between multiple connecting mechanisms can be conveniently adjusted according to different aviation metals. Specifically, the operating plate is rotated to drive the connecting disc to rotate, thereby driving the vertical rod and the pushing protruding plate to rotate. When the pushing protruding plate rotates, it is turned out from between the two sliding protruding plates to the outside. The sliding protruding plates move under the elastic force of the compression spring II, and the positioning rod moves out from the inside of the positioning groove to release the braking state of the device. At this time, the position of the sliding disc can be adjusted. After adjustment is completed, the operating plate is reversed again to change the position of the sliding disc, thereby realizing the change of the distance between multiple connecting mechanisms and improving the applicability of the device to different aviation metals.

[0029] By applying a pulsed current to the aerospace metal to be inspected on the testing platform, eddy currents are induced in the metal material. The changes in the eddy current field are then used to assess the material integrity. Combined with the aforementioned features of adapting to surface variations and flexibly adjusting position and spacing, this effectively reduces detection errors introduced by factors such as inconsistent lift-off distances, thereby improving the accuracy of detecting corrosion defects in aerospace metals and providing a more reliable guarantee for aviation safety. Attached Figure Description

[0030] Figure 1 This is a three-dimensional structural schematic diagram of the multi-excitation source pulse-modulated eddy current aerospace metal corrosion defect detection device proposed in this invention.

[0031] Figure 2 This is a three-dimensional structural schematic diagram of the adjustment mechanism in the multi-excitation source pulse modulation eddy current aerospace metal corrosion defect detection device proposed in this invention;

[0032] Figure 3 This is a three-dimensional structural diagram of the detection mechanism in the multi-excitation source pulse modulation eddy current aerospace metal corrosion defect detection device proposed in this invention;

[0033] Figure 4 This is a three-dimensional structural diagram of the connecting mechanism in the multi-excitation source pulse modulation eddy current aerospace metal corrosion defect detection device proposed in this invention;

[0034] Figure 5 This is an exploded view of the connecting mechanism in the multi-excitation source pulse-modulated eddy current aerospace metal corrosion defect detection device proposed in this invention;

[0035] Figure 6 This is an exploded view of the main mounting plate and the first mounting disk in the multi-excitation source pulse modulation eddy current aerospace metal corrosion defect detection device proposed in this invention.

[0036] Figure 7 This is an exploded view of the operation panel in the multi-excitation source pulse-modulated eddy current aerospace metal corrosion defect detection device proposed in this invention.

[0037] Figure 8 This is an exploded view of the sliding circular plate and sliding convex plate in the multi-excitation source pulse modulation eddy current aerospace metal corrosion defect detection device proposed in this invention.

[0038] In the diagram: 1. Support leg; 2. Testing platform; 3. Lateral adjustment frame; 4. Mounting frame; 5. Longitudinal adjustment frame; 6. Moving platform; 7. Front and rear adjustment frame; 8. Main mounting plate; 9. Connecting bracket; 10. Fixed support plate; 11. Strip hole; 12. Universal joint I; 13. Connecting sleeve I; 14. Sliding inner rod; 15. Connecting sleeve II; 16. Universal joint II; 17. Protective sleeve; 18. Mounting plate I; 19. Mounting plate II; 20. Support base plate; 21. Threaded groove; 22. Miniature excitation coil; 23. Connecting screw; 24. Compression spring I; 25. Side groove; 26. Positioning groove; 27. Sliding circular plate; 28. Cylindrical block; 29. ​​Arc-shaped hole; 30. Connecting circular plate; 31. Operating plate; 32. Vertical rod; 33. Pushing convex plate; 34. Sliding convex plate; 35. Clearance hole; 36. Fixed shaft; 37. Rectangular groove; 38. Compression spring II; 39. Positioning rod. Detailed Implementation

[0039] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0040] In one embodiment: Refer to Figures 1-8 The specific implementation method of the detection device is as follows:

[0041] The testing device mainly consists of three parts: a testing platform 2, a testing mechanism, and an adjustment mechanism. The testing platform 2 is used to place the aerospace metal to be tested, and its bottom is fixedly equipped with support legs 1, providing stable support for the entire device. Support legs 1 can be made of high-strength alloy steel to ensure sufficient load-bearing capacity and stability.

[0042] The detection mechanism is the core component of this device, used to detect corrosion defects in aerospace metals. The detection mechanism includes a main mounting plate 8, with multiple slotted holes 11 inside. Cylindrical blocks 28 are slidably connected within these slotted holes 11. A mounting disk II 19 is fixedly mounted at the bottom of the cylindrical block 28. The mounting disk II 19 is detachably connected to a protective sleeve 17 via a connecting mechanism. Multiple sets of miniature excitation coils 22 are housed inside the protective sleeve 17.

[0043] The testing mechanism also includes a fixed shaft 36, with sliding circular plates 27 fixedly mounted at both the top and bottom. The bottom of the lower sliding circular plate 27 is fixedly connected to the top of the cylindrical block 28. Two symmetrical rectangular grooves 37 are formed on one side of the sliding circular plate 27, and sliding protrusions 34 are slidably connected within the rectangular grooves 37. A compression spring II 38 is installed between one side of the sliding protrusion 34 and the inner wall of one side of the rectangular groove 37. Two symmetrical positioning rods 39 are fixedly mounted on one side of the sliding protrusion 34. Multiple clearance holes 35 are formed on one side of the sliding circular plate 27, and one end of the positioning rod 39 slides through the clearance hole 35.

[0044] Side grooves 25 are formed on the inner walls of both sides of the strip-shaped hole 11. Multiple positioning grooves 26 are formed on the top and bottom inner walls of the side grooves 25. A sliding circular plate 27 is slidably connected inside the side grooves 25, and a positioning rod 39 engages with the positioning grooves 26. When the position of the detection mechanism needs to be adjusted, the operating plate 31 is rotated. The operating plate 31 drives the connecting circular plate 30 to rotate, which in turn drives the vertical rod 32 to rotate, which in turn drives the pushing protrusion 33 to rotate. At this time, two centrally symmetrical arc-shaped holes 29 are formed inside the upper sliding circular plate 27. The top of the sliding circular plate 27 is rotatably connected to the connecting circular plate 30. The operating plate 31 is fixedly installed on the top of the connecting circular plate 30, and two vertical rods 32 are fixedly installed on the bottom of the connecting circular plate 30. The bottom of the vertical rods 32 passes through the arc-shaped holes 29 and is fixedly installed with the pushing protrusion 33. One side of the sliding protrusion 34 and one side of the pushing protrusion 33 are both arc-shaped, and they work together. The push plate 33 is rotated outward from between the two sliding plates 34, and then the sliding plates 34 move under the elastic force of the compression spring II 38. The positioning rod 39 moves out from inside the positioning groove 26, releasing the braking state of the device. At this time, the position of the sliding circular plate 27 can be adjusted. After the adjustment is completed, the operating plate 31 is reversed again, so that the two sliding plates 34 are moved away again, changing the position of the sliding circular plate 27, realizing the change of distance between multiple connecting mechanisms to adapt to aerospace metals of different sizes and shapes.

[0045] During the inspection process, multiple sheaths 17 can conform to the surface of the aerospace metal. Due to the flexibility of universal joints I 12 and II 16, steering is possible, and the sliding inner rod 14 and connecting sleeve II 15 allow for appropriate extension of the sheaths 17 at different positions. In this way, multiple sheaths 17 can automatically adapt to the surface of the aerospace metal. When scanning uneven surfaces such as rivets, even if some sheaths 17 are lifted, the others can still maintain good contact, minimizing blind spots. By applying a pulsed current to the aerospace metal to be inspected on the inspection platform 2, eddy currents are induced in the metal material. The material integrity is assessed by detecting changes in the eddy current field.

[0046] An adjustment mechanism is located on the top of the testing platform 2 and is used to adjust the position of the testing mechanism. The adjustment mechanism includes a fixed support plate 10 fixedly installed on the top of the testing platform 2, a mounting bracket 4 fixedly installed on one side of the fixed support plate 10, a transverse adjustment bracket 3 fixedly installed on one side of the mounting bracket 4, a longitudinal adjustment bracket 5 slidably connected to one side of the transverse adjustment bracket 3, a front and rear adjustment bracket 7 slidably connected to one side of the longitudinal adjustment bracket 5, a movable stage 6 slidably connected to the top of the front and rear adjustment bracket 7, a connecting bracket 9 fixedly installed on one side of the movable stage 6, and the bottom of the connecting bracket 9 fixedly connected to the top of the main mounting plate 8. In use, the aerospace metal to be inspected is placed on top of the inspection platform 2. The lateral position of the main mounting plate 8 can be adjusted by moving the longitudinal adjustment frame 5 on the transverse adjustment frame 3. The longitudinal height of the main mounting plate 8 can be adjusted by moving the front and rear adjustment frame 7 on the longitudinal adjustment frame 5. The front and rear position of the main mounting plate 8 can be adjusted by moving the moving stage 6 on the surface of the front and rear adjustment frame 7. Thus, the main mounting plate 8 can perform all-round inspection of the aerospace metal. The front and rear adjustment frame 7, the longitudinal adjustment frame 5, and the transverse adjustment frame 3 are all equipped with lead screws, sliders, and servo motors. The slider is threaded through the lead screw, and the output shaft of the servo motor is fixedly connected to one end of the lead screw and is used to drive the slider to move laterally, thereby adjusting its position.

[0047] This application can be used in the aviation field, or in other fields where this application is applicable.

[0048] In another embodiment: Reference Figures 1-8 A multi-excitation source pulse-modulated eddy current aerospace metal corrosion defect detection device and method are disclosed. This device is applied in the aerospace field. The connection mechanism includes a mounting plate I18, which is threadedly connected to a mounting plate II19. A universal joint I12 is installed at the bottom of the mounting plate I18. A connecting sleeve I13 is fixedly installed at the bottom of the universal joint I12. A sliding inner rod 14 is fixedly installed at the bottom of the connecting sleeve I13. A connecting sleeve II15 is slidably fitted onto the outer wall of the sliding inner rod 14. A universal joint II16 is installed at the bottom of the connecting sleeve II15. A support base plate 20 is fixedly installed at the bottom of the universal joint II16. A threaded groove 21 is formed at the bottom of the support base plate 20. A connecting screw 23 is fixedly installed at the top of the sheath 17, and the connecting screw 23 is threadedly connected to the threaded groove 21. A compression spring I24 is installed between the bottom of the sliding inner rod 14 and the inner wall of the bottom of the connecting sleeve II15. This structure ensures that the sheath 17 has a certain elastic buffer when in contact with the aerospace metal surface, further improving the adaptability of the detection.

[0049] Through the coordinated operation of the above structures, this multi-excitation source pulse-modulated eddy current aerospace metal corrosion defect detection device can effectively solve the problems in traditional detection methods, such as the rigid structure of the probe being difficult to adapt to the curved surface changes of aerospace components, the inflexible adjustment of the detection position, and the inability to conveniently adjust the spacing of the detection mechanism, thereby improving the accuracy and applicability of aerospace metal corrosion defect detection.

[0050] However, as is well known to those skilled in the art, the working principle and wiring method of the miniature excitation coil 22 are conventional means or common knowledge, and will not be described in detail here. Those skilled in the art can make any selections according to their needs or convenience.

[0051] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A multi-excitation source pulsed modulated eddy current airborne metal corrosion defect detection apparatus, characterized in that, The utility model relates to an aviation metal corrosion defect detection device, including: A detection platform (2) for placing aviation metal, the bottom of the detection platform (2) is fixedly connected with a support leg (1); A detection mechanism for detecting corrosion defects of aviation metal, the detection mechanism includes a main mounting plate (8), a plurality of strip holes (11) are formed in the inside of the main mounting plate (8), a cylindrical block (28) is slidably connected in the inside of the strip hole (11), the bottom of the cylindrical block (28) is fixedly connected with a mounting disc II (19), the bottom of the mounting disc II (19) is detachably connected with a sheath (17) through a connecting mechanism, a plurality of groups of micro excitation coils (22) are arranged in the inside of the sheath (17); An adjusting mechanism arranged on the top of the detection platform (2) and used for adjusting the position of the detection mechanism, the connecting mechanism includes a universal joint and a sliding assembly, so that the sheath (17) can automatically adapt to the surface curvature change of the aviation metal, and when scanning uneven surfaces, part of the sheaths (17) is lifted up while the other sheaths (17) remain in contact.

2. The multi-excitation source pulsed modulated eddy current aerial metal corrosion defect detection device according to claim 1, characterized in that, The detection mechanism further includes a fixed shaft (36), the top and bottom of the fixed shaft (36) are fixedly connected with sliding circular plates (27), the bottom of the lower sliding circular plate (27) is fixedly connected with the top of the cylindrical block (28), a symmetrically arranged two rectangular grooves (37) are formed in the side of the sliding circular plate (27), a sliding convex plate (34) is slidably connected in the inside of the rectangular groove (37), a compression spring II (38) is arranged between the side of the sliding convex plate (34) and the inner wall of the side of the rectangular groove (37), the side of the sliding convex plate (34) is fixedly connected with symmetrically arranged two positioning rods (39), a plurality of make room holes (35) are formed in the side of the sliding circular plate (27), one end of the positioning rod (39) slidably penetrates the make room hole (35), the positioning rod (39) is clamped or separated from the positioning groove (26) through the elastic force of the compression spring II (38), so that the sliding circular plate (27) is braked or released.

3. The multi-excitation source pulsed modulated eddy current aerial metal corrosion defect detection apparatus according to claim 2, wherein, A side edge groove (25) is formed in the inner wall of both sides of the strip hole (11), a plurality of positioning grooves (26) are formed in the top inner wall and the bottom inner wall of the side edge groove (25), the sliding circular plate (27) is slidably connected in the inside of the side edge groove (25), the positioning rod (39) is clamped with the positioning groove (26), and the clamping of the positioning rod (39) and the positioning groove (26) ensures the stability of the detection position and avoids displacement error in the detection process.

4. The multi-excitation source pulsed modulated eddy current aerial metal corrosion defect detection apparatus according to claim 3, wherein, The inside of the upper sliding round plate (27) is provided with two arc-shaped holes (29), which are centrally symmetrically arranged, the top of the sliding round plate (27) is rotatably connected with a connecting round plate (30), the top of the connecting round plate (30) is fixedly connected with an operating plate (31), the bottom of the connecting round plate (30) is fixedly connected with two vertical rods (32), the bottom of the vertical rod (32) penetrates through the arc-shaped hole (29) and is fixedly connected with a pushing protruding plate (33), one side of the sliding protruding plate (34) is arc-shaped, one side of the pushing protruding plate (33) is arc-shaped, the pushing protruding plate (33) is used in cooperation with the sliding protruding plate (34), the operating plate (31) is rotated to drive the pushing protruding plate (33) to rotate through the vertical rod (32), the arc-shaped surface of the pushing protruding plate (33) interacts with the arc-shaped surface of the sliding protruding plate (34), so that the sliding protruding plate (34) moves and drives the positioning rod (39) to be separated from the positioning groove (26).

5. The multi-excitation source pulsed modulated eddy current aerial metal corrosion defect detection apparatus of claim 1, wherein, The adjusting mechanism comprises a fixed support plate (10) fixedly connected to the top of the detection platform (2), one side of the fixed support plate (10) is fixedly connected with a mounting rack (4), one side of the mounting rack (4) is fixedly connected with a transverse adjusting rack (3), one side of the transverse adjusting rack (3) is slidably connected with a longitudinal adjusting rack (5), one side of the longitudinal adjusting rack (5) is slidably connected with a front and rear adjusting rack (7), the top of the front and rear adjusting rack (7) is slidably connected with a moving table (6), one side of the moving table (6) is fixedly connected with a connecting bracket (9), the bottom of the connecting bracket (9) is fixedly connected with the top of the main mounting plate (8), the transverse position is adjusted by moving the longitudinal adjusting rack (5) on the transverse adjusting rack (3), the longitudinal height is adjusted by moving the front and rear adjusting rack (7) on the longitudinal adjusting rack (5), the front and rear position is adjusted by moving the moving table (6) on the front and rear adjusting rack (7), and omnidirectional positioning of the detection mechanism is realized.

6. The multi-excitation source pulsed modulated eddy current aerial metal corrosion defect detection apparatus of claim 1, wherein, The connecting mechanism comprises a mounting disc I (18), the mounting disc I (18) and the mounting disc II (19) are threadedly connected, the bottom of the mounting disc I (18) is provided with a universal joint I (12), the bottom of the universal joint I (12) is fixedly connected with a connecting sleeve I (13), the bottom of the connecting sleeve I (13) is fixedly connected with a sliding inner rod (14), and the outer wall of the sliding inner rod (14) is slidably sleeved with a connecting sleeve II (15).

7. The multi-excitation source pulsed modulated eddy current aerial metal corrosion defect detection apparatus according to claim 6, wherein, The bottom of the connecting sleeve II (15) is provided with a universal joint II (16), the bottom of the universal joint II (16) is fixedly connected with a supporting bottom plate (20), the universal joint I (12) and the universal joint II (16) provide multi-directional rotation freedom, and the sliding cooperation of the sliding inner rod (14) and the connecting sleeve II (15) provides axial telescopic freedom, so that the sheath (17) is self-adapting to the change of the curved surface.

8. The multi-excitation source pulsed modulated eddy current aerial metal corrosion defect detection apparatus according to claim 7, wherein, The bottom of the supporting bottom plate (20) is provided with a threaded groove (21), the top of the sheath (17) is fixedly connected with a connecting screw rod (23), and the connecting screw rod (23) is threadedly connected with the threaded groove (21).

9. The multi-excitation source pulsed modulated eddy current aerial metal corrosion defect detection apparatus of claim 7, wherein, The bottom of the sliding inner rod (14) is provided with a compression spring I (24) between the inner wall of the bottom of the connecting sleeve II (15).

10. A method of multi-excitation source pulsed modulated eddy current aerial metal corrosion defect detection using the apparatus of any one of claims 1 to 9, characterized in that, The method comprises the following steps: S1: Place the aviation metal to be detected on the top of the detection platform (2), and ensure that the surface of the aviation metal is not blocked and is placed stably; S2: Adjust the position of the detection mechanism by the adjusting mechanism, specifically: push the longitudinal adjusting frame (5) to slide along the transverse adjusting frame (3) to adjust the transverse position of the main mounting plate (8); push the front and rear adjusting frame (7) to slide along the longitudinal adjusting frame (5) to adjust the longitudinal height of the main mounting plate (8); push the moving table (6) to slide along the front and rear adjusting frame (7) to adjust the front and rear position of the main mounting plate (8), so that the sheath (17) below the main mounting plate (8) is aligned with the region to be detected of the aviation metal; S3: According to the size of the aviation metal, adjust the spacing of the connecting mechanism: rotate the operation plate (31) to drive the connecting circular plate (30) and the vertical rod (32) to rotate, so that the pushing convex plate (33) is turned out from the two sliding convex plates (34) to the outside, the sliding convex plate (34) moves under the elastic force of the compression spring II (38), and the positioning rod (39) moves out of the positioning groove (26); push the sliding circular plate (27) to slide along the side edge groove (25) to adjust the position of the cylindrical block (28) in the strip-shaped hole (11), thereby changing the spacing between the multiple sheaths (17); After the spacing adjustment is completed, the operation plate (31) is reversed, the pushing convex plate (33) pushes the two sliding convex plates (34) to move close to each other, the positioning rod (39) is reinserted into the positioning groove (26), and the position of the sliding circular plate (27) is fixed; S4: Start detection, apply pulse current through the micro excitation coil (22) inside the sheath (17), the magnetic field generated by the pulse current induces eddy current inside the aviation metal, and in the detection process, the sheath (17) is turned through the universal joint I (12) and the universal joint II (16) of the connecting mechanism, the sliding inner rod (14) slides along the connecting sleeve II (15), so that the multiple sheaths (17) automatically adapt to the curved surface or uneven surface of the aviation metal, and maintain good contact with the surface of the aviation metal; S5: Detect the change data of the eddy current field, and evaluate whether there is a corrosion defect inside the aviation metal and the position and size of the defect according to the amplitude and distribution law of the change of the eddy current field.

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