Optical flaw detection device and detection method for internal cracks of porcelain insulator

Abstract

The invention discloses a porcelain insulator internal crack optical flaw detection device and a detection method, and relates to the technical field of porcelain insulator flaw detection, the porcelain insulator internal crack optical flaw detection device comprises a mounting seat, an angle adjusting detection piece is mounted on a limiting frame, and a correction locking piece is mounted at the top of a turntable. According to the crack detection device disclosed by the invention, an angle adjusting detection piece is arranged, a movable swing frame drives a crack detection probe main body to incline, a third motor rotates to enable a turntable to rotate, and a first motor drives a second screw rod to rotate to enable a U-shaped frame to horizontally move along the second screw rod; all parts in the umbrella skirt of the porcelain insulator are detected through rotation of the porcelain insulator and intermittent movement of the crack detection probe main body, and the crack detection probe main body shoots the inner side of the umbrella skirt of the porcelain insulator from different angles by adjusting the inclination angle of the movable swing frame; therefore, misjudgment caused by single-angle shooting is prevented, the porcelain insulator does not need to be repeatedly adjusted and installed in the process, the operation is simple, and the detection efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of porcelain insulator flaw detection technology, specifically to an optical flaw detection device and method for internal cracks in porcelain insulators. Background Technology

[0002] Flaw detection on the inside of porcelain insulators is a core non-destructive testing procedure to ensure the safe operation of porcelain insulators in power systems. For the inspection of the inside of the insulator skirts, optical inspection probes are generally used in conjunction with visual recognition sensors to automatically identify suspected crack areas, achieving "focused" optical scanning. The built-in image recognition algorithm can analyze the image image from the optical lens in real time, quickly distinguish cracks, porcelain demolding marks, dust, etc., and automatically mark suspected crack areas, improving the detection rate of microcracks and discontinuous cracks.

[0003] Because the inner side of the porcelain insulator skirt is concave, the position of the porcelain insulator needs to be repeatedly changed when inspecting the inner side of the skirt. This requires repeated installation and disassembly of the porcelain insulator, which is cumbersome and reduces the inspection efficiency. Furthermore, the accuracy of the inspection is affected by the unidirectional inspection of the inner side of the porcelain insulator. Summary of the Invention

[0004] The purpose of this invention is to solve the problem of the inconvenience of rapid and accurate crack detection on the inner side of porcelain insulators, and to provide an optical flaw detection device and method for internal cracks in porcelain insulators.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an optical flaw detection device for internal cracks in porcelain insulators, comprising a mounting base, first L-shaped side plates mounted on both sides of the mounting base, a mating plate inserted into the top of the first L-shaped side plates, a second L-shaped side plate connected to the top of the mating plate, a limiting frame located above the mounting base on one side of the second L-shaped side plate, stop frames mounted on both sides of the bottom of the limiting frame, an angle adjustment detection component mounted on the limiting frame, a movable swing frame connected to the inner side of the limiting frame via the angle adjustment detection component, a crack detection probe body mounted on the inner side of the movable swing frame, a sensor mounted on one side of the crack detection probe body, a turntable mounted on the top of the mounting base, a positioning frame mounted on the bottom of the mounting base, a third motor mounted on the bottom of the positioning frame, the output end of the third motor connected to the bottom of the turntable, and a correction locking component mounted on the top of the turntable; The angle adjustment detection component includes a first motor installed on one side of the second L-shaped side plate. The output end of the first motor is connected to a second lead screw located inside the limiting frame. A U-shaped frame is movably sleeved on the outside of the second lead screw. A first slider and a second slider are respectively installed at both ends of the U-shaped frame. The first slider and the second slider are slidably connected to the limiting frame. The movable swing frame has locking shafts installed on both sides that are rotatably connected to the first slider and the second slider. An indicator is installed at one end of the locking shaft on one side of the first slider. A support frame is provided on the outside of the first slider. An angle measuring ring is installed at one end of the support frame.

[0006] As a further aspect of the present invention: the bottom end of the stop frame is rotatably connected to a plurality of ball bearings via a rotating shaft.

[0007] As a further embodiment of the present invention: the center of the measuring ring and the snap-fit ​​shaft are coaxial.

[0008] As a further embodiment of the present invention: the angle adjustment detection component further includes a disc installed at one end of the locking shaft and located on one side of the second slider. A locking pin is installed at one end of the disc. A connecting frame is fixedly connected to one side of the second slider. A third piston cylinder is installed on one side of the connecting frame. A second solenoid valve is installed at one end of the third piston cylinder. A second piston cylinder is installed at one end of the second solenoid valve. A straight groove slide rail is sleeved on the outer side of the locking pin. A second piston rod extending to the inner side of the second piston cylinder is installed on the outer wall of the straight groove slide rail. An air hole is opened at the end of the third piston cylinder away from the second solenoid valve. A piston plate is slidably connected to the inner side of the third piston cylinder. A telescopic spring connected to the inner wall of the third piston cylinder is provided at one end of the piston plate.

[0009] As a further embodiment of the present invention: the center of the disc and the center of the locking pin are misaligned, and the inner wall width of the straight groove slide rail is equal to the diameter of the locking pin.

[0010] As a further embodiment of the present invention: the correction locking component includes a positioning frame installed on the top of the turntable, a positioning ring is provided at the top of the positioning frame, a limit guide block is installed at the top of the positioning ring, a pressing rod is inserted into the limit guide block, a clamping plate is installed at the end of the pressing rod near the center of the positioning ring, a guide rod is rotatably connected to the end of the pressing rod away from the clamping plate through a rotating shaft, a push frame is provided at one end of the guide rod, a movable ring is provided at one end of the push frame located below the positioning ring, a second motor is installed on the top of the turntable located on one side of the positioning frame, a first lead screw is connected to the output end of the second motor, and a threaded sleeve fitted onto the outside of the first lead screw is provided on the push frame.

[0011] As a further embodiment of the present invention: the center of the positioning ring, the center of the movable ring, and the center of the turntable are coaxial.

[0012] As a further embodiment of the present invention: the correction locking component further includes a first connecting plate installed on one side of the second L-shaped side plate, one side of the first L-shaped side plate is installed on a second side plate located below the first connecting plate, a telescopic cylinder is installed at the bottom of the second side plate, the extension section of the telescopic cylinder extends to the top of the second side plate, a first piston rod is installed at the bottom of the first connecting plate, a first piston cylinder located outside the first piston rod is installed at the top of the second side plate, a first solenoid valve connected to the first piston cylinder is provided at the bottom of the second side plate, a guide pipe is connected to the bottom end of the first solenoid valve, and a water storage tank is provided at one end of the guide pipe.

[0013] As a further aspect of the present invention: the top of the first L-shaped side plate is provided with a groove that fits into the mating insert plate.

[0014] This invention also discloses an optical flaw detection method for internal cracks in porcelain insulators, which uses the aforementioned optical flaw detection device for internal cracks in porcelain insulators and includes the following steps: S1: First, install the porcelain insulator on the top of the mounting base using the correction locking device, so that the inner side of the shed of the porcelain insulator faces the limiting frame. Then, the blocking frame is made to fit with the porcelain insulator by moving the second L-shaped side plate down. S2: Move the movable swing arm to the left, which will cause the crack detection probe body to tilt. At this time, the locking shaft will cause the indicator to rotate. The tilt angle of the movable swing arm can be determined by the position of the indicator corresponding to the angle linkage, so as to tilt the crack detection probe body and make the lighting device on the crack detection probe body face the inside of the umbrella skirt. S3: Start the third motor. The rotation of the third motor will cause the turntable to rotate, which will cause the correction locking component to drive the porcelain insulator to rotate. At this time, a ring test can be performed on the inner side of the porcelain insulator skirt. S4: Start the first motor, which drives the rotation of the second lead screw to make the U-shaped frame move horizontally along the second lead screw. This changes the distance between the crack detection probe body and the center of the porcelain insulator. Then, in conjunction with the rotation of the porcelain insulator, a ring inspection can be performed on another part of the umbrella skirt. The inspection of all parts inside the porcelain insulator umbrella skirt is achieved by the rotation of the porcelain insulator and the intermittent movement of the crack detection probe body. S5: By adjusting the tilt angle of the movable swing frame, the crack detection probe body can take pictures of the inner side of the porcelain insulator skirt from different angles; S6: Remove the porcelain insulator after the test is completed.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. By setting an angle-adjusting detection component, the movable swing frame tilts the main body of the crack detection probe. The rotation of the third motor causes the turntable to rotate, which in turn causes the correction locking component to rotate the porcelain insulator. At this time, a circular inspection can be performed on the inner side of the porcelain insulator skirt. The rotation of the first motor drives the second lead screw, causing the U-shaped frame to move horizontally along the second lead screw. This changes the distance between the main body of the crack detection probe and the center of the porcelain insulator. Then, in conjunction with the rotation of the porcelain insulator, a circular inspection can be performed on another part of the skirt. The rotation of the porcelain insulator and the intermittent movement of the crack detection probe body achieve the inspection of the porcelain insulator. The inspection of all parts inside the umbrella skirt is achieved by adjusting the tilt angle of the movable swing frame, allowing the crack detection probe to capture images of the inner side of the porcelain insulator umbrella skirt from different angles. After the angle of the movable swing frame is adjusted, the second solenoid valve is energized. At this time, the second solenoid valve closes, and the aqueous solution in the second piston cylinder loses its flow space, thereby fixing and limiting the tilted movable swing frame. This improves the stability of the crack detection probe during the inspection of the porcelain insulator and prevents misjudgment caused by shooting from a single angle. This process does not require repeated adjustment and installation of the porcelain insulator, is simple to operate, improves inspection efficiency, and also improves the accuracy of the inspection. 2. By setting a correction locking device, the second motor is started when the porcelain insulator is placed inside the positioning ring. At this time, the second motor drives the rotation of the first lead screw, which causes the threaded sleeve to move the push frame upward. The push frame then presses the compression rod through the guide rod, thereby clamping and fixing the porcelain insulator with the clamp plate, so that the shed part of the porcelain insulator is above the clamp plate. Then, the third motor is started, which drives the rotation of the turntable, so that the porcelain insulator and the turntable rotate synchronously. This allows the crack detection probe body to perform a circular image of the inner side of the insulator's shed, further improving the detection efficiency. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 For the present invention Figure 1 Enlarged view of point A in the middle; Figure 3 This is a schematic diagram of the bottom structure of the mounting base of the present invention; Figure 4 This is a schematic diagram showing the connection between the turntable and the positioning ring of the present invention; Figure 5 This is a schematic diagram of the limiting frame of the present invention; Figure 6 This is a schematic diagram showing the connection between the movable swing frame and the second slider of the present invention; Figure 7 This is a schematic diagram of the internal structure of the second and third piston cylinders of the present invention; Figure 8 This is a schematic diagram showing the connection between the water storage tank and the first piston cylinder of the present invention.

[0017] In the diagram: 1. Mounting base; 2. First L-shaped side plate; 3. Connecting plate; 4. Second L-shaped side plate; 5. Limiting frame; 6. Movable swing frame; 7. Crack detection probe body; 8. First motor; 9. First connecting plate; 10. Telescopic cylinder; 11. Second side plate; 12. Turntable; 13. Water tank; 14. Guide pipe; 15. First slider; 16. Support frame; 17. Snap-fit ​​connecting shaft; 18. Angle measuring ring; 19. Indicator; 20. First piston cylinder; 21. First piston rod; 22. First solenoid valve; 23. Positioning frame; 24. Second motor; 25. First... 26. Lead screw; 27. Threaded sleeve; 28. Positioning bracket; 29. ​​Positioning ring; 30. Moving ring; 31. Push bracket; 32. Guide rod; 33. Pressing rod; 34. Limiting guide block; 35. Clamping plate; 36. Sensor; 37. Second lead screw; 38. U-shaped bracket; 39. Second slider; 40. Disc; 41. Locking pin; 42. Straight groove slide rail; 43. Second piston rod; 44. Second piston cylinder; 45. Second solenoid valve; 46. Third piston cylinder; 47. Connecting bracket; 48. Air hole; 49. Telescopic spring; 50. Piston plate; 51. Stop frame; 52. Third motor. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of this invention, it should be noted that unless otherwise explicitly specified and limited, the terms "installed," "connected," "linked," and "set up" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. The following describes embodiments of the invention based on its overall structure.

[0020] Please see Figures 1 to 8 In this embodiment of the invention, the optical flaw detection device for internal cracks in porcelain insulators includes a mounting base 1. First L-shaped side plates 2 are mounted on both sides of the mounting base 1. A mating plate 3 is inserted into the top of the first L-shaped side plate 2. A second L-shaped side plate 4 is connected to the top of the mating plate 3. A limiting frame 5 located above the mounting base 1 is provided on one side of the second L-shaped side plate 4. Stop frames 50 are installed on both sides of the bottom of the limiting frame 5. An angle adjustment detection component is installed on the limiting frame 5. A movable swing frame 6 is connected to the inner side of the limiting frame 5 through the angle adjustment detection component. A crack detection probe body 7 is installed on the inner side of the movable swing frame 6. A sensor 35 is provided on one side of the crack detection probe body 7. A turntable 12 is mounted on the top of the mounting base 1. A positioning frame 23 is provided at the bottom of the mounting base 1. A third motor 51 is mounted at the bottom of the positioning frame 23. The output end of the third motor 51 is connected to the bottom of the turntable 12. A correction locking component is installed on the top of the turntable 12. The angle adjustment detection component includes a first motor 8 installed on one side of the second L-shaped side plate 4. The output end of the first motor 8 is connected to a second lead screw 36 located inside the limiting frame 5. A U-shaped frame 37 is movably sleeved on the outside of the second lead screw 36. A first slider 15 and a second slider 38 are respectively installed at both ends of the U-shaped frame 37. Both the first slider 15 and the second slider 38 are slidably connected to the limiting frame 5. The movable swing frame 6 has a locking shaft 17 installed on both sides, which is rotatably connected to the first slider 15 and the second slider 38. An indicator 19 located on one side of the first slider 15 is installed at one end of the locking shaft 17. A support frame 16 is provided on the outside of the first slider 15. An angle measuring ring 18 is installed at one end of the support frame 16.

[0021] The bottom of the stop frame 50 is rotatably connected to multiple balls via a rotating shaft, and the center of the measuring ring 18 is coaxial with the center of the locking shaft 17.

[0022] In this embodiment: First, the porcelain insulator is installed above the mounting base 1 using the correction locking device, so that the inner side of the insulator's skirt faces the limiting frame 5. Then, the second L-shaped side plate 4 is moved down to make the blocking frame 50 fit against the porcelain insulator. Next, the movable swing arm 6 is moved to the left, causing the crack detection probe body 7 to tilt. At this time, the locking shaft 17 will cause the indicator 19 to rotate. The tilt angle of the movable swing arm 6 is determined by the position of the indicator 19 corresponding to the angle measuring ring 18, thereby tilting the crack detection probe body 7 so that the lighting device on the crack detection probe body 7 is aligned with the inner side of the skirt. Then, the third motor 51 is started, and the rotation of the third motor 51 causes the turntable 12 to rotate, thereby causing the correction locking device to rotate the porcelain insulator. At this time, the porcelain insulator skirt can be rotated. A circular inspection is performed on the inner side of the skirt. Then, the first motor 8 is started, which drives the rotation of the second lead screw 36, causing the U-shaped frame 37 to move horizontally along the second lead screw 36. This changes the distance between the crack detection probe body 7 and the center of the porcelain insulator. Then, in conjunction with the rotation of the porcelain insulator, a circular inspection can be performed on another part of the skirt. By rotating the porcelain insulator and intermittently moving the crack detection probe body 7, all parts inside the porcelain insulator skirt can be inspected. Similarly, by adjusting the tilt angle of the movable swing frame 6, the crack detection probe body 7 can take pictures of the inner side of the porcelain insulator skirt from different angles, thus preventing misjudgment caused by shooting from a single angle. This process does not require repeated adjustment and installation of the porcelain insulator, making the operation simple, improving the inspection efficiency, and also improving the inspection accuracy.

[0023] Please refer to this carefully. Figure 6 , Figure 7 The angle adjustment detection component also includes a disc 39 installed at one end of the locking shaft 17 and located on one side of the second slider 38. A locking pin 40 is installed at one end of the disc 39. A connecting frame 46 is fixedly connected to one side of the second slider 38. A third piston cylinder 45 is installed on one side of the connecting frame 46. A second solenoid valve 44 is installed at one end of the third piston cylinder 45. A second piston cylinder 43 is installed at one end of the second solenoid valve 44. A straight groove slide rail 41 is sleeved on the outside of the locking pin 40. A second piston rod 42 extending to the inside of the second piston cylinder 43 is installed on the outer wall of the straight groove slide rail 41. An air hole 47 is opened at the end of the third piston cylinder 45 away from the second solenoid valve 44. A piston plate 49 is slidably connected to the inside of the third piston cylinder 45. A telescopic spring 48 connected to the inner wall of the third piston cylinder 45 is provided at one end of the piston plate 49.

[0024] In this case, the center of the disc 39 is misaligned with the center of the locking pin 40, and the inner wall width of the straight groove slide rail 41 is equal to the diameter of the locking pin 40.

[0025] In this embodiment: when the movable swing frame 6 rotates relative to the second slider 38, it drives the disc 39 to rotate through the locking shaft 17. At this time, the disc 39 drives the straight groove slide rail 41 to reciprocate in the horizontal direction through the locking pin 40. When the straight groove slide rail 41 pushes towards the second piston cylinder 43, the aqueous solution inside the second piston cylinder 43 will enter the third piston cylinder 45 through the second solenoid valve 44. As the aqueous solution is injected into the third piston cylinder 45, the piston plate 49 moves towards the air hole 47. When the second piston rod 42 moves away from the second piston cylinder 43, the piston plate 49 will squeeze the aqueous solution in the third piston cylinder 45 into the second piston cylinder 43 under the elastic restoring force of the telescopic spring 48. After the angle of the movable swing frame 6 is adjusted, the second solenoid valve 44 is energized. At this time, the second solenoid valve 44 is closed, and the aqueous solution in the second piston cylinder 43 will lose its flow space, thereby fixing and limiting the tilted movable swing frame 6, thereby improving the stability of the crack detection probe body 7 in the process of detecting porcelain insulators.

[0026] Please refer to this carefully. Figure 1 , Figure 3 , Figure 4 , Figure 8 The correction locking component includes a positioning frame 27 installed on the top of the turntable 12. A positioning ring 28 is provided at the top of the positioning frame 27. A limit guide block 33 is installed at the top of the positioning ring 28. A pressing rod 32 is inserted into the limit guide block 33. A clamping plate 34 is installed at the end of the pressing rod 32 near the center of the positioning ring 28. A guide rod 31 is rotatably connected to the end of the pressing rod 32 away from the clamping plate 34 through a rotating shaft. A push frame 30 is provided at one end of the guide rod 31. A movable ring 29 located below the positioning ring 28 is provided at one end of the push frame 30. A second motor 24 located on one side of the positioning frame 27 is installed on the top of the turntable 12. A first lead screw 25 is connected to the output end of the second motor 24. A threaded sleeve 26 sleeved on the outside of the first lead screw 25 is provided on the push frame 30. The correction locking component also includes a first connecting plate 9 installed on one side of the second L-shaped side plate 4. A second side plate 11 located below the first connecting plate 9 is installed on one side of the first L-shaped side plate 2. A telescopic cylinder 10 is installed at the bottom of the second side plate 11. The extension section of the telescopic cylinder 10 extends to the top of the second side plate 11. A first piston rod 21 is installed at the bottom of the first connecting plate 9. A first piston cylinder 20 located outside the first piston rod 21 is installed at the top of the second side plate 11. A first solenoid valve 22 connected to the first piston cylinder 20 is provided at the bottom of the second side plate 11. A guide pipe 14 is connected to the bottom end of the first solenoid valve 22. A water storage tank 13 is provided at one end of the guide pipe 14.

[0027] The center of the positioning ring 28, the center of the movable ring 29, and the center of the turntable 12 are coaxial, and the top of the first L-shaped side plate 2 is provided with a sliding groove that matches the docking plate 3.

[0028] In this embodiment: when the porcelain insulator is placed inside the positioning ring 28, the second motor 24 is started. At this time, the second motor 24 drives the rotation of the first lead screw 25, causing the threaded sleeve 26 to drive the push frame 30 to move upward. The push frame 30 then compresses the compression rod 32 through the guide rod 31, thereby clamping and fixing the porcelain insulator with the clamping plate 34, so that the shed part of the porcelain insulator is above the clamping plate 34. Then, the third motor 51 is started. The rotation of the turntable 12 driven by the third motor 51 makes the porcelain insulator and the turntable 12 rotate synchronously, so that the crack detection probe body 7 performs a circular image of the inner side of the insulator's shed, further improving the detection efficiency. The extension of cylinder 10 causes the first connecting plate 9 to move the second L-shaped side plate 4 upward. When the porcelain insulator is being tested, the retraction of the telescopic cylinder 10 causes the bottom of the first connecting plate 9 to lose support. At this time, the first connecting plate 9 will move downward under the gravity of the limiting frame 5. When the third motor 51 comes into contact with the porcelain insulator, the second side plate 11 retracts. At this time, the extended section of the second side plate 11 will separate from the first connecting plate 9. Then the first solenoid valve 22 is closed. At this time, the aqueous solution inside the first piston cylinder 20 will lose its flow space, thereby locking and fixing the second L-shaped side plate 4. This can improve the stability of the crack detection probe body 7 when moving horizontally and further improve the accuracy of the detection.

[0029] The following describes a method for optically detecting internal cracks in porcelain insulators, based on the aforementioned optical flaw detection device, specifically including the following steps: S1: When the porcelain insulator is placed inside the positioning ring 28, the second motor 24 is started. At this time, the second motor 24 drives the rotation of the first lead screw 25 to cause the threaded sleeve 26 to drive the push frame 30 to move upward. At this time, the push frame 30 will squeeze the extrusion rod 32 through the guide rod 31, so that the clamping plate 34 clamps and fixes the porcelain insulator, so that the umbrella skirt part of the porcelain insulator is above the clamping plate 34. The bottom of the first connecting plate 9 loses support by the contraction of the telescopic cylinder 10. At this time, the first connecting plate 9 will move downward under the gravity of the limiting frame 5. When the third motor 51 contacts the porcelain insulator, the second side plate 11 contracts. At this time, the extension section of the second side plate 11 will separate from the first connecting plate 9. Then the first solenoid valve 22 is closed. At this time, the aqueous solution inside the first piston cylinder 20 will lose its flow space, so as to lock and fix the second L-shaped side plate 4. S2: Move the movable swing arm 6 to the left, causing the crack detection probe body 7 to tilt. At this time, the locking shaft 17 will cause the indicator 19 to rotate. The tilt angle of the movable swing arm 6 is determined by the position of the indicator 19 corresponding to the angle measuring ring 18, thereby tilting the crack detection probe body 7 so that the lighting device on the crack detection probe body 7 is aligned with the inside of the umbrella skirt. When the movable swing arm 6 rotates relative to the second slider 38, it will cause the disc 39 to rotate through the locking shaft 17. At this time, the disc 39 will drive the straight groove slide rail 41 to reciprocate horizontally through the locking pin 40. When the straight groove slide rail 41 pushes towards the second piston cylinder 43... During movement, the aqueous solution inside the second piston cylinder 43 enters the third piston cylinder 45 through the second solenoid valve 44. As the aqueous solution is injected into the third piston cylinder 45, the piston plate 49 moves toward the air hole 47. When the second piston rod 42 moves away from the second piston cylinder 43, the piston plate 49 will be squeezed into the second piston cylinder 43 by the elastic restoring force of the extension spring 48. After the angle of the movable swing frame 6 is adjusted, the second solenoid valve 44 is energized. At this time, the second solenoid valve 44 is closed, and the aqueous solution in the second piston cylinder 43 loses its flow space, thereby fixing and limiting the tilted movable swing frame 6. S3: Start the third motor 51. The rotation of the turntable 12 driven by the third motor 51 will make the porcelain insulator rotate synchronously with the turntable 12, so that the crack detection probe body 7 can take a circular picture of the inner side of the insulator skirt. S4: Start the first motor 8, and drive the second lead screw 36 to rotate so that the U-shaped frame 37 moves horizontally along the second lead screw 36. This changes the distance between the crack detection probe body 7 and the center of the porcelain insulator. Then, in conjunction with the rotation of the porcelain insulator, a ring inspection can be performed on another part of the umbrella skirt. The inspection of all parts inside the porcelain insulator umbrella skirt is achieved by the rotation of the porcelain insulator and the intermittent movement of the crack detection probe body 7. S5: By adjusting the tilt angle of the movable swing frame 6, the crack detection probe body 7 can take pictures of the inner side of the porcelain insulator skirt from different angles; S6: Remove the porcelain insulator after the test is completed.

[0030] The above description is merely 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. An optical flaw detection device for internal cracks in porcelain insulators, comprising a mounting base (1), characterized in that, The mounting base (1) is equipped with first L-shaped side plates (2) on both sides. A mating plate (3) is inserted into the top of the first L-shaped side plate (2). A second L-shaped side plate (4) is connected to the top of the mating plate (3). A limiting frame (5) located above the mounting base (1) is provided on one side of the second L-shaped side plate (4). A stop frame (50) is installed on both sides of the bottom of the limiting frame (5). An angle adjustment detection component is installed on the limiting frame (5). The inner side of the limiting frame (5) is connected to a [missing information - likely a device or component] via the angle adjustment detection component. The movable swing frame (6) has a crack detection probe body (7) installed on its inner side. A sensor (35) is provided on one side of the crack detection probe body (7). A turntable (12) is installed on the top of the mounting base (1). A positioning frame (23) is provided at the bottom of the mounting base (1). A third motor (51) is installed at the bottom of the positioning frame (23). The output end of the third motor (51) is connected to the bottom of the turntable (12). A correction locking component is installed on the top of the turntable (12). The angle adjustment detection device includes a first motor (8) installed on one side of the second L-shaped side plate (4). The output end of the first motor (8) is connected to a second lead screw (36) located inside the limiting frame (5). A U-shaped frame (37) is movably sleeved on the outside of the second lead screw (36). A first slider (15) and a second slider (38) are respectively installed at both ends of the U-shaped frame (37). The first slider (15) and the second slider (38) are slidably connected to the limiting frame (5). The movable swing frame (6) is equipped with a snap-fit ​​connecting shaft (17) that is rotatably connected to the first slider (15) and the second slider (38). An indicator (19) located on one side of the first slider (15) is installed at one end of the snap-fit ​​connecting shaft (17). A support frame (16) is provided on the outside of the first slider (15). A measuring ring (18) is installed at one end of the support frame (16).

2. The optical flaw detection device for internal cracks in porcelain insulators according to claim 1, characterized in that, The bottom end of the stop frame (50) is rotatably connected to multiple ball bearings via a rotating shaft.

3. The optical flaw detection device for internal cracks in porcelain insulators according to claim 1, characterized in that, The center of the measuring ring (18) is coaxial with the center of the snap-fit ​​shaft (17).

4. The optical flaw detection device for internal cracks in porcelain insulators according to claim 1, characterized in that, The angle adjustment detection component also includes a disc (39) installed at one end of the locking shaft (17) and located on one side of the second slider (38). A locking pin (40) is installed at one end of the disc (39). A connecting frame (46) is fixedly connected to one side of the second slider (38). A third piston cylinder (45) is installed on one side of the connecting frame (46). A second solenoid valve (44) is installed at one end of the third piston cylinder (45). A second piston cylinder (45) is installed at one end of the second solenoid valve (44). 3) A straight groove slide rail (41) is sleeved on the outer side of the locking pin (40). A second piston rod (42) extending to the inner side of the second piston cylinder (43) is installed on the outer wall of the straight groove slide rail (41). An air hole (47) is opened at one end of the third piston cylinder (45) away from the second solenoid valve (44). A piston plate (49) is slidably connected to the inner side of the third piston cylinder (45). A telescopic spring (48) connected to the inner wall of the third piston cylinder (45) is provided at one end of the piston plate (49).

5. The optical flaw detection device for internal cracks in porcelain insulators according to claim 4, characterized in that, The center of the disc (39) is misaligned with the center of the locking pin (40), and the inner wall width of the straight groove slide rail (41) is equal to the diameter of the locking pin (40).

6. The optical flaw detection device for internal cracks in porcelain insulators according to claim 4, characterized in that, The correction locking component includes a positioning frame (27) mounted on the top of the turntable (12). A positioning ring (28) is provided at the top of the positioning frame (27). A limit guide block (33) is installed on the top of the positioning ring (28). A pressing rod (32) is inserted into the limit guide block (33). A clamping plate (34) is installed at the end of the pressing rod (32) near the center of the positioning ring (28). The end of the pressing rod (32) away from the clamping plate (34) is rotatably connected via a rotating shaft. There is a guide rod (31), one end of which is provided with a push frame (30), one end of which is provided with a movable ring (29) located below the positioning ring (28), the top of the turntable (12) is equipped with a second motor (24) located on one side of the positioning frame (27), the output end of the second motor (24) is connected to a first lead screw (25), and the push frame (30) is provided with a threaded sleeve (26) sleeved on the outside of the first lead screw (25).

7. The optical flaw detection device for internal cracks in porcelain insulators according to claim 6, characterized in that, The center of the positioning ring (28), the center of the movable ring (29), and the center of the turntable (12) are coaxial.

8. The optical flaw detection device for internal cracks in porcelain insulators according to claim 6, characterized in that, The correction locking component also includes a first connecting plate (9) installed on one side of the second L-shaped side plate (4). One side of the first L-shaped side plate (2) is installed on a second side plate (11) located below the first connecting plate (9). A telescopic cylinder (10) is installed at the bottom of the second side plate (11). The extension section of the telescopic cylinder (10) extends to the top of the second side plate (11). A first piston rod (21) is installed at the bottom of the first connecting plate (9). A first piston cylinder (20) located outside the first piston rod (21) is installed at the top of the second side plate (11). A first solenoid valve (22) connected to the first piston cylinder (20) is provided at the bottom of the second side plate (11). A guide pipe (14) is connected to the bottom end of the first solenoid valve (22). A water storage tank (13) is provided at one end of the guide pipe (14).

9. The optical flaw detection device for internal cracks in porcelain insulators according to claim 8, characterized in that, The top of the first L-shaped side plate (2) is provided with a groove that matches the mating insert plate (3).

10. An optical flaw detection method for internal cracks in porcelain insulators, characterized in that, The optical flaw detection device for internal cracks in porcelain insulators according to any one of claims 1-9 includes the following steps: S1: First, install the porcelain insulator above the mounting base (1) by means of the correction locking part, so that the inner side of the shed of the porcelain insulator faces the limiting frame (5), and then make the blocking frame (50) fit with the porcelain insulator by moving the second L-shaped side plate (4) down. S2: Move the movable swing arm (6) to the left. The movable swing arm (6) will cause the crack detection probe body (7) to tilt. At this time, the locking shaft (17) will cause the indicator (19) to rotate. The tilt angle of the movable swing arm (6) can be determined by the position of the indicator (19) corresponding to the angle measuring ring (18). The crack detection probe body (7) will be tilted so that the lighting device on the crack detection probe body (7) is aligned with the inside of the umbrella skirt. S3: Start the third motor (51), and the rotation of the third motor (51) causes the turntable (12) to rotate, thereby causing the correction locking part to drive the porcelain insulator to rotate. At this time, a ring test can be performed on the inner side of the porcelain insulator skirt. S4: Start the first motor (8), and drive the second lead screw (36) to rotate so that the U-shaped frame (37) moves horizontally along the second lead screw (36). This changes the distance between the crack detection probe body (7) and the center of the porcelain insulator. Then, in conjunction with the rotation of the porcelain insulator, a ring inspection can be performed on another part of the umbrella skirt. The inspection of all parts inside the porcelain insulator umbrella skirt is achieved by the rotation of the porcelain insulator and the intermittent movement of the crack detection probe body (7). S5: By adjusting the tilt angle of the movable swing frame (6), the crack detection probe body (7) can take pictures of the inner side of the porcelain insulator skirt from different angles; S6: Remove the porcelain insulator after the test is completed.

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