Ultrasonic guided wave nondestructive testing device and damage identification method for power transmission conductor

Abstract

The application relates to the technical field of wire detection, and discloses an ultrasonic guided wave nondestructive testing device for power transmission wires and a damage identification method, which comprises a positioning cover, and a direction-changing detection assembly is arranged in the positioning cover. The direction-changing detection assembly is provided, a driving motor in the direction-changing detection assembly drives an outer gear to mesh with an inner gear ring of a rotating disc, the rotating disc is stably rotated along a guide rail, an ultrasonic wave transceiving integrated machine is synchronously driven to move around the circumference of the wire, meanwhile, a sliding rod on a sliding block slides along a vortex-shaped line sliding groove of a guide plate, cooperates with the sliding of a light rod along an oblique strip-shaped groove of a swing arm on the rotating disc, forms double guidance, the vortex-shaped line sliding groove guides the radial movement of the sliding block, the oblique strip-shaped groove drives the swing arm to deflect around the sliding block, linkage of the two enables real-time dynamic adjustment of the detection angle of a probe, the structure can more comprehensively cover the circumferential and radial key areas of the wire, significantly reduces the dead angle of defects such as cracks and corrosion in detection, and obviously improves the overall detection coverage rate and integrity of the wire.

Description

Technical Field

[0001] This invention belongs to the field of conductor testing technology, specifically, it relates to an ultrasonic guided wave non-destructive testing device and a damage identification method for power transmission conductors. Background Technology

[0002] As the core carrier of power transmission, the production quality of transmission conductors directly determines the operational safety and service life of the power system. During the conductor production process, factors such as raw material purity, rolling process, stranding precision, and plating treatment can easily lead to latent or overt defects such as cracks, internal inclusions, plating peeling, and localized corrosion. If such substandard conductors enter the market and are put into use, they may cause serious accidents such as wire breaks and short circuits due to the expansion of defects during subsequent operation. Therefore, non-destructive testing in the production process is a key step in ensuring conductor quality.

[0003] Existing detection probes mostly use fixed probes, which can only cover a local area of ​​the wire. In order to avoid detection blind spots as much as possible, a large number of probes are often required to cover different detection directions. This not only significantly increases the manufacturing cost and structural complexity of the equipment, but also further affects the detection efficiency and accuracy due to the increased signal interference and calibration difficulty between multiple probes.

[0004] In view of this, the present invention is proposed. Summary of the Invention

[0005] To solve the above-mentioned technical problems, the basic concept of the technical solution adopted by the present invention is as follows:

[0006] An ultrasonic guided wave non-destructive testing device for power transmission lines includes a positioning cover.

[0007] The positioning cover is hollow inside and is used to insert power transmission wires. A direction change detection component is installed inside the positioning cover.

[0008] The direction-changing detection component includes a pair of turntables and a guide plate. The pair of turntables are rotatably installed inside the positioning cover. A pair of sliders that slide towards the center of the turntables are slidably arranged on the pair of turntables. A swing arm is rotatably installed on the slider. An ultrasonic transceiver is installed at the end of the swing arm. The probe of the ultrasonic transceiver is aligned with the outer surface of the power transmission line. The guide plate is fixedly installed inside the positioning cover, and the guide plate and the turntable are on the same axis. A spiral groove is formed on the guide plate, and the spiral groove is slidably connected to the slider.

[0009] The swing arm has a strip groove, which is inclined, and a light rod is slidably mounted on the strip groove. The light rod is mounted on the turntable.

[0010] When the turntable rotates, it drives the ultrasonic transceiver to rotate around the power transmission line. Under the guidance of the vortex groove and the optical rod, the angle of the ultrasonic transceiver changes, reducing blind spots in the detection process.

[0011] In a preferred embodiment of the present invention, a bracket is installed at the bottom of the positioning cover, a top column is installed at the bottom of the bracket, a support column is vertically inserted at the bottom of the top column, a base is installed at the bottom of the support column, the base is in the shape of a boss, an anti-slip pad is installed at the bottom of the base, and a bolt is screwed onto the support column, with the end of the bolt fitting against the side wall of the top column for positioning the top column.

[0012] In a preferred embodiment of the present invention, positioning sleeves are provided at both ends of the side wall of the positioning cover, the inner cavity of the positioning sleeve is connected to the inner cavity of the positioning cover, and three pairs of clamping components are installed inside the positioning sleeve, the clamping components being used to limit the position of the power transmission line.

[0013] In a preferred embodiment of the present invention, each pair of clamping components includes a guide wheel, the guide wheel is placed in the inner cavity of the positioning sleeve, and a positioning frame is rotatably mounted on the guide wheel. A threaded rod is rotatably mounted on the positioning frame, the threaded rod is screwed into the side wall of the positioning sleeve, a knob is installed at the end of the threaded rod, an insertion rod is installed on the positioning frame, the insertion rod is movably inserted into the positioning sleeve, and an insertion plate is installed at the end of the insertion rod, the cross-sectional area of ​​the insertion plate being larger than that of the insertion rod.

[0014] In a preferred embodiment of the present invention, the turntable sidewall is rotatably connected to the inner cavity of the positioning sleeve, a guide rail is mounted on the turntable, a support is slidably disposed on the guide rail, and the support is installed inside the positioning cover, an internal gear ring is mounted inside the turntable, an external gear is meshed on the internal gear ring, a positioning plate is mounted on the sidewall of the positioning cover, a drive motor is mounted on the outer shell of the positioning plate, and the output end of the drive motor is connected to the external gear.

[0015] In a preferred embodiment of the present invention, a controller is mounted on the bracket, and the controller is used to control the rotation of the turntable.

[0016] In a preferred embodiment of the present invention, a slide rod is installed on the slider, and the slide rod is slidably disposed in the spiral groove. A slide plate is installed on the side wall of the slider, and a limit rod is movably installed through the slide plate. Limit seats are installed at both ends of the limit rod, and the limit seats are installed on the turntable. A fixed seat is installed on the turntable, and the fixed seat is connected to the light rod.

[0017] A damage identification method for an ultrasonic guided wave non-destructive testing device for power transmission lines, comprising the following steps:

[0018] Step 1: Clean the surface of the target section of the power transmission line to be tested, removing oil, rust and debris; check the probe status of the ultrasonic transceiver, the connection stability of the drive motor and the operating status of the controller; calibrate the parameters of the ultrasonic transceiver through the controller, and set the ultrasonic guided wave transmission frequency and amplitude parameters that are compatible with the power transmission line to be tested.

[0019] Step 2: Place the base on a flat area of ​​the testing site, and ensure the overall stability of the device by using the anti-slip pad at the bottom of the base; loosen the bolts on the support column, adjust the insertion depth of the top column in the support column, so that the central axis of the positioning cover is aligned with the axis of the power transmission line to be tested, and tighten the bolts to fix the position of the top column, thereby achieving the height positioning of the device;

[0020] Step 3: Insert the power transmission wire to be tested into the inner cavity of the positioning sleeve at both ends of the positioning cover in sequence, so that the wire is in the center position inside the positioning cover; rotate the knob at the end of the threaded rod to drive the positioning frame to move along the guide rod until each guide wheel is in contact with the outer surface of the wire, and the wire is limited and fixed by the three pairs of clamping components, and the insert plate prevents the positioning frame from detaching from the insert rod.

[0021] Step 4: The drive motor is started by the controller. The drive motor drives the external gear to rotate, and through the meshing transmission of the internal gear ring, the turntable rotates along the guide rail and the support. When the turntable rotates, the slide rod slides along the spiral groove, and the optical rod slides along the strip groove, causing the ultrasonic transceiver to rotate around the circumference of the wire and adjust the detection angle in real time. The ultrasonic transceiver emits ultrasonic guided waves and receives reflected signals, converting the reflected signals into electrical signals and transmitting them to the processing module.

[0022] Step 5: The processing module performs filtering and noise reduction preprocessing on the electrical signal, compares the preprocessed signal with the ultrasonic guided wave signal template of the normal conductor, and analyzes the amplitude, propagation time and waveform characteristics of the reflected signal; based on the signal characteristic abrupt change, combined with the detection position and angle information of the ultrasonic transceiver, the location, type and size of the conductor damage are determined, and damage identification is completed.

[0023] Compared with the prior art, the present invention has the following advantages:

[0024] This invention includes a reversing detection component. A drive motor in this component drives an external gear to mesh with an internal gear ring on the turntable, causing the turntable to rotate stably along the guide rail. Simultaneously, this drives the ultrasonic transceiver to move in a circular motion around the conductor. Meanwhile, a sliding rod on the slider slides along a spiral groove on the guide plate, cooperating with the sliding of a smooth rod on the turntable along an inclined slot on the swing arm, forming a dual guiding system: the spiral groove guides the slider to move radially, and the inclined slot drives the swing arm to deflect around the slider. This linkage allows for real-time dynamic adjustment of the probe's detection angle. This structure provides more comprehensive coverage of the conductor's circumferential and radial critical areas, significantly reducing blind spots in the detection of defects such as cracks and corrosion, significantly improving the overall detection coverage and integrity of the conductor, reducing the amount of detection equipment used, lowering the overall equipment cost, and enhancing reliability.

[0025] The specific embodiments of the present invention will now be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0026] In the attached diagram:

[0027] Figure 1 A three-dimensional diagram of an ultrasonic guided wave non-destructive testing device for power transmission lines;

[0028] Figure 2 This is a diagram showing the internal structure of the positioning sleeve in an ultrasonic guided wave non-destructive testing device for power transmission lines.

[0029] Figure 3 This is a structural diagram of the internal structure of the positioning cover of an ultrasonic guided wave non-destructive testing device for power transmission lines;

[0030] Figure 4 A three-dimensional view of the turntable of an ultrasonic guided wave non-destructive testing device for power transmission lines;

[0031] Figure 5 An ultrasonic guided wave non-destructive testing device for power transmission lines. Figure 4 Enlarged view of point A in the middle;

[0032] Figure 6 A partial view of an ultrasonic guided wave non-destructive testing device for power transmission lines. Figure 1 ;

[0033] Figure 7 A partial view of an ultrasonic guided wave non-destructive testing device for power transmission lines. Figure 2 ;

[0034] In the diagram: 1. Positioning cover; 2. Support column; 3. Top column; 4. Bracket; 5. Base; 6. Controller; 7. Positioning sleeve; 8. Guide wheel; 9. Positioning frame; 10. Threaded rod; 11. Insert rod; 12. Insert plate; 13. External gear; 14. Drive motor; 15. Positioning plate; 16. Guide rail; 17. Support; 18. Guide plate; 19. Spiral groove; 20. Slider; 21. Sliding rod; 22. Slide plate; 23. Limiting rod; 24. Limiting seat; 25. Swing arm; 26. Ultrasonic transceiver; 27. Strip groove; 28. Smooth rod; 29. ​​Fixed seat; 30. Turntable; 31. Internal gear ring. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate the present invention.

[0036] Example 1:

[0037] like Figures 1 to 7 As shown, an ultrasonic guided wave non-destructive testing device for power transmission lines includes a positioning cover 1, which is hollow inside and used to insert the power transmission line. A direction-changing detection component is provided inside the positioning cover 1.

[0038] The direction change detection assembly includes a pair of turntables 30 and a guide plate 18. The pair of turntables 30 are rotatably installed inside the positioning cover 1. A pair of sliders 20 are slidably arranged on the pair of turntables 30 and slide towards the center of the turntables 30. A swing arm 25 is rotatably installed on the slider 20. An ultrasonic transceiver 26 is installed at the end of the swing arm 25. The probe of the ultrasonic transceiver 26 is aligned with the outer surface of the power transmission line. The guide plate 18 is fixedly installed inside the positioning cover 1, and the guide plate 18 and the turntables 30 are on the same axis. A spiral groove 19 is opened on the guide plate 18, and the spiral groove 19 is slidably connected to the slider 20.

[0039] A strip groove 27 is provided on the swing arm 25. The strip groove 27 is inclined. A smooth rod 28 is slidably arranged on the strip groove 27. The smooth rod 28 is installed on the turntable 30.

[0040] When the turntable 30 rotates, it drives the ultrasonic transceiver 26 to rotate around the power transmission line. Under the guidance of the vortex slide 19 and the light rod 28, the angle of the ultrasonic transceiver 26 changes, reducing blind spots in the detection process.

[0041] like Figures 1 to 7As shown, in a specific embodiment, a bracket 4 is installed at the bottom of the positioning cover 1, a top column 3 is installed at the bottom of the bracket 4, a support column 2 is vertically inserted at the bottom of the top column 3, and a base 5 is installed at the bottom of the support column 2. The base 5 is in the shape of a boss and has an anti-slip pad installed at the bottom of the base 5. A bolt is screwed onto the support column 2, and the end of the bolt is attached to the side wall of the top column 3 for positioning the top column 3. This support structure achieves stable placement and height adjustment of the device through the cooperation of the base 5, the support column 2, the top column 3, and the bracket 4. The boss-shaped base 5 and the anti-slip pad enhance the placement stability, and the bolt fixing method ensures reliable positioning after height adjustment. It can adapt to power transmission line detection scenarios of different heights, improving the versatility of the device. The anti-slip pad and the positioning function of the bolts in the base 5 ensure the stability of the overall support.

[0042] like Figures 1 to 7 As shown, further, positioning sleeves 7 are provided at both ends of the side wall of positioning cover 1. The inner cavity of positioning sleeve 7 is connected to the inner cavity of positioning cover 1. Three pairs of clamping components are installed inside the positioning sleeve 7. The clamping components are used to limit the position of the power transmission line. Each pair of clamping components includes a guide wheel 8. The guide wheel 8 is placed in the inner cavity of positioning sleeve 7. A positioning frame 9 is rotatably installed on the guide wheel 8. A threaded rod 10 is rotatably installed on the positioning frame 9. The threaded rod 10 is screwed into the side wall of positioning sleeve 7. A knob is installed at the end of the threaded rod 10. An insertion rod 11 is installed on the positioning frame 9. The insertion rod 11 is movably inserted into the positioning sleeve 7. An insertion plate 12 is installed at the end of the insertion rod 11. The cross-sectional area of ​​the insertion plate 12 is larger than that of the insertion rod 11. The positioning sleeve 7 enables smooth connection between the wire and the positioning cover 1. The three pairs of clamping components, through the cooperation of the guide wheel 8, the positioning frame 9, and the threaded rod 10, achieve the centering and limiting of the wire. The knob operation is convenient and the adjustment is precise. The design of the insertion rod 11 and the insertion plate 12 prevents the positioning frame 9 from disengaging, ensuring the reliability of clamping and avoiding the wire offset during testing from affecting the accuracy. The rolling contact of the guide wheel 8 reduces wire wear, and the screwing structure of the threaded rod 10 ensures the adjustability of the clamping force.

[0043] Example 2:

[0044] The difference between the above embodiments and this embodiment is that: Figures 1 to 7As shown, the sidewall of the turntable 30 is rotatably connected to the inner cavity of the positioning sleeve 7. A guide rail 16 is mounted on the turntable 30, and a support 17 is slidably mounted on the guide rail 16. The support 17 is installed inside the positioning cover 1. An internal gear ring 31 is installed inside the turntable 30, and an external gear 13 is meshed on the internal gear ring 31. A positioning plate 15 is mounted on the sidewall of the positioning cover 1, and a drive motor 14 is mounted on the outer shell of the positioning plate 15. The output end of the drive motor 14 is connected to the external gear 13. The cooperation between the guide rail 16 and the support 17 improves the rotational stability of the turntable 30. The meshing transmission between the internal gear ring 31 and the external gear 13 achieves smooth power transmission. The drive motor 14 provides a stable power source, and the positioning plate 15 ensures the installation reliability of the drive structure, making the rotational speed and accuracy of the turntable 30 controllable. This provides power assurance for the accurate detection of the direction change detection component. The meshing structure between the internal gear ring 31 and the external gear 13 improves transmission efficiency and stability.

[0045] like Figures 1 to 7 As shown, in a specific embodiment, a controller 6 is installed on the bracket 4. The controller 6 is used to control the start and stop of the drive motor 14. The controller 6 enables centralized control of the start and stop of the drive motor 14, which is convenient to operate and responds quickly. It allows operators to flexibly control the rotation of the turntable 30 according to the detection process, improving the ease of operation and automation of the device. The cooperation between the controller 6 and the drive motor 14 makes the detection process easier to control.

[0046] like Figures 1 to 7 As shown, furthermore, a slide rod 21 is installed on the slider 20, and the slide rod 21 is slidably disposed in the spiral groove 19. A slide plate 22 is installed on the side wall of the slider 20, and a limit rod 23 is movably installed through the slide plate 22. Limit seats 24 are installed at both ends of the limit rod 23. The limit seats 24 are installed on the turntable 30, and a fixed seat 29 is installed on the turntable 30. The fixed seat 29 is connected to the smooth rod 28. The cooperation between the slide rod 21 and the spiral groove 19 makes the slider 20 slide more smoothly. The limit rod 23 and the limit seat 24 limit the sliding direction of the slider 20 through the slide plate 22, ensuring that the slider 20 moves along the set trajectory. The fixed seat 29 enhances the installation stability of the smooth rod 28, further improves the accuracy of the angle adjustment of the swing arm 25, and ensures the reliability of the detection angle of the ultrasonic transceiver 26. The limiting function of the limit rod 23 and the limit seat 24 is the key to the stable sliding of the slider 20.

[0047] This invention also discloses a damage identification method for an ultrasonic guided wave nondestructive testing device for power transmission lines, the steps of which are as follows:

[0048] Step 1: Clean the surface of the target section of the power transmission line to be tested, removing oil, rust and debris; check the probe status of the ultrasonic transceiver 26, the connection stability of the drive motor 14 and the operating status of the controller 6, and calibrate the parameters of the ultrasonic transceiver 26 through the controller 6, setting the ultrasonic guided wave transmission frequency and amplitude parameters that are compatible with the power transmission line to be tested.

[0049] Step 2: Place the base 5 on a flat area of ​​the testing site, and ensure the overall stability of the device by using the anti-slip pad at the bottom of the base 5; loosen the bolts on the support column 2, adjust the insertion depth of the top column 3 in the support column 2, so that the central axis of the positioning cover 1 is aligned with the axis of the power transmission line to be tested, and tighten the bolts to fix the position of the top column 3 to achieve the height positioning of the device;

[0050] Step 3: Insert the power transmission wire to be tested into the inner cavity of the positioning sleeve 7 at both ends of the positioning cover 1 in sequence, so that the wire is in the center position inside the positioning cover 1; rotate the knob at the end of the threaded rod 10 to drive the positioning frame 9 to move along the insertion rod 11 until each of the guide wheels 8 is in contact with the outer surface of the wire, and the three pairs of clamping components form a limiting and fixing of the wire, and the insertion plate 12 prevents the positioning frame 9 from disengaging from the insertion rod 11;

[0051] Step 4: The controller 6 starts the drive motor 14, which drives the external gear 13 to rotate. Through the meshing transmission of the internal gear ring 31, the turntable 30 rotates along the guide rail 16 and the support 17. When the turntable 30 rotates, the slide rod 21 slides along the spiral groove 19, and the optical rod 28 slides along the strip groove 27, causing the ultrasonic transceiver 26 to rotate around the circumference of the wire and adjust the detection angle in real time. The ultrasonic transceiver 26 emits ultrasonic guided waves and receives reflected signals, converting the reflected signals into electrical signals and transmitting them to the processing module.

[0052] Step 5: The processing module performs filtering and noise reduction preprocessing on the electrical signal, compares the preprocessed signal with the ultrasonic guided wave signal template of the normal conductor, and analyzes the amplitude, propagation time and waveform characteristics of the reflected signal; based on the signal characteristic abrupt change, combined with the detection position and angle information of the ultrasonic transceiver 26, the location, type and size of the conductor damage are determined, and damage identification is completed.

[0053] The implementation principle of the ultrasonic guided wave non-destructive testing device for power transmission lines of the present invention is as follows:

[0054] The base 5 is used to stably place the device at the testing site. The anti-slip pad at the bottom of the base 5 can improve the stability of the device. According to the height requirements of the power transmission line, the insertion depth of the top column 3 in the support column 2 is adjusted. After the height is suitable, the bolts on the support column 2 are tightened. The position of the top column 3 is fixed by the fit between the end of the bolt and the side wall of the top column 3, thereby making the positioning cover 1 at the testing height that is suitable for the power transmission line. The entire support structure is connected to the bottom of the positioning cover 1 through the bracket 4 to ensure the stable support of the positioning cover 1.

[0055] Subsequently, the power transmission line is positioned and connected to the device. The power transmission line is then passed sequentially through the inner cavities of the positioning sleeves 7 at both ends of the positioning cover 1. Since the inner cavities of the positioning sleeves 7 and the positioning cover 1 are interconnected, the power transmission line can be smoothly inserted into the positioning cover 1. The knob at the end of the threaded rod 10 on the side wall of the positioning sleeve 7 is rotated, and the threaded rod 10 is screwed into the side wall of the positioning sleeve 7, driving the positioning frame 9 to move along the guide direction of the insertion rod 11 until the guide wheel 8 on the positioning frame 9 is in contact with the outer surface of the power transmission line. The guide wheels 8 of the three pairs of clamping components work together to limit and fix the power transmission line. The insertion plate 12 at the end of the insertion rod 11 can prevent the positioning frame 9 from disengaging from the insertion rod 11, ensuring the positioning stability of the clamping components for the power transmission line.

[0056] After positioning is completed, the detection process is started. The controller 6 on the bracket 4 controls the drive motor 14 on the positioning plate 15 to start. The output end of the drive motor 14 drives the external gear 13 to rotate. Since the external gear 13 is meshed with the internal gear ring 31 inside the turntable 30, and the turntable 30 is slidably connected to the support 17 inside the positioning cover 1 through the guide rail 16, the rotation of the external gear 13 drives the internal gear ring 31 and the turntable 30 to rotate synchronously, so as to realize the stable rotation of the turntable 30 inside the positioning cover 1.

[0057] During the rotation of the turntable 30, the direction-changing detection component is driven synchronously to achieve all-round detection. When the turntable 30 rotates, the slide rod 21 on the slider 20 slides along the spiral groove 19 of the guide plate 18. The guide plate 18 is fixedly installed inside the positioning cover 1 and is on the same axis as the turntable 30. The guiding effect of the spiral groove 19 causes the slider 20 to slide towards the center of the turntable 30 along the length direction of the limiting rod 23. The limiting rod 23 is installed on the turntable 30 through the limiting seat 24 to provide stable guidance for the sliding of the slider 20. At the same time, the smooth rod 28 connected to the fixed seat 29 on the turntable 30 slides along the inclined strip groove 27 on the swing arm 25. Under the cooperation of the smooth rod 28 and the strip groove 27, the swing arm 25 deflects at an angle around the rotation connection point on the slider 20. The aforementioned dual guiding effect allows the ultrasonic transceiver 26 at the end of the swing arm 25 on the slider 20 to rotate around the power transmission line with the turntable 30, while also enabling real-time changes in the detection angle. This ensures that the probe of the ultrasonic transceiver 26 is always aligned with the outer surface of the power transmission line. During specific testing, the probe of the ultrasonic transceiver 26 emits ultrasonic guided waves, which propagate along the power transmission line. When these waves encounter defects (such as cracks, corrosion, or damage) inside or on the surface of the line, they undergo changes such as reflection, refraction, or attenuation. The ultrasonic transceiver 26 receives these reflected signals, converts them into electrical signals, and transmits them to the relevant processing module (not shown in the figure). By analyzing and processing the signals, it is possible to determine whether there are defects in the power transmission line and the location and size of the defects, effectively reducing blind spots in the testing process and achieving comprehensive ultrasonic guided wave non-destructive testing of the power transmission line.

[0058] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An ultrasonic guided wave non-destructive testing device for power transmission lines, comprising a positioning cover (1), characterized in that: The positioning cover (1) is hollow inside and is used to insert power transmission wires. A direction change detection component is provided inside the positioning cover (1). The direction change detection component includes a pair of turntables (30) and a guide plate (18). The pair of turntables (30) are rotatably installed inside the positioning cover (1). The pair of turntables (30) are slidably provided with a pair of sliders (20) that slide toward the center of the turntables (30). A swing arm (25) is rotatably installed on the slider (20). An ultrasonic transceiver (26) is installed at the end of the swing arm (25). The probe of the ultrasonic transceiver (26) is aligned with the outer surface of the power transmission line. The guide plate (18) is fixedly installed inside the positioning cover (1), and the guide plate (18) and the turntables (30) are on the same axis. A spiral groove (19) is opened on the guide plate (18), and the spiral groove (19) is slidably connected to the slider (20). The swing arm (25) has a strip groove (27) which is inclined. A light rod (28) is slidably arranged on the strip groove (27) and the light rod (28) is mounted on the turntable (30). When the turntable (30) rotates, the turntable (30) drives the ultrasonic transceiver (26) to rotate around the power transmission line. Under the guidance of the vortex groove (19) and the light rod (28), the angle of the ultrasonic transceiver (26) changes, reducing the dead angle in the detection process.

2. The ultrasonic guided wave non-destructive testing device for power transmission lines according to claim 1, characterized in that, The positioning cover (1) is equipped with a bracket (4) at the bottom, and a top column (3) is installed at the bottom of the bracket (4). A support column (2) is vertically inserted at the bottom of the top column (3). A base (5) is installed at the bottom of the support column (2). The base (5) is in the shape of a boss. An anti-slip pad is installed at the bottom of the base (5). A bolt is screwed onto the support column (2), and the end of the bolt is attached to the side wall of the top column (3) for positioning the top column (3).

3. The ultrasonic guided wave non-destructive testing device for power transmission lines according to claim 1, characterized in that, Positioning sleeves (7) are provided at both ends of the side wall of the positioning cover (1). The inner cavity of the positioning sleeve (7) is connected to the inner cavity of the positioning cover (1). Three pairs of clamping components are installed inside the positioning sleeve (7). The clamping components are used to limit the position of the power transmission line.

4. The ultrasonic guided wave non-destructive testing device for power transmission lines according to claim 3, characterized in that, Each pair of clamping components includes a guide wheel (8) placed inside the positioning sleeve (7), and a positioning frame (9) is rotatably mounted on the guide wheel (8). A threaded rod (10) is rotatably mounted on the positioning frame (9). The threaded rod (10) is screwed into the side wall of the positioning sleeve (7). A knob is installed at the end of the threaded rod (10). An insertion rod (11) is installed on the positioning frame (9). The insertion rod (11) is movably inserted into the positioning sleeve (7). An insertion plate (12) is installed at the end of the insertion rod (11), and the cross-sectional area of ​​the insertion plate (12) is larger than that of the insertion rod (11).

5. The ultrasonic guided wave non-destructive testing device for power transmission lines according to claim 1, characterized in that, The side wall of the turntable (30) is rotatably connected to the inner cavity of the positioning sleeve (7). A guide rail (16) is installed on the turntable (30). A support (17) is slidably arranged on the guide rail (16) and the support (17) is installed inside the positioning cover (1). An internal gear ring (31) is installed inside the turntable (30). An external gear (13) is meshed on the internal gear ring (31). A positioning plate (15) is installed on the side wall of the positioning cover (1). A drive motor (14) is installed on the outer shell of the positioning plate (15). The output end of the drive motor (14) is connected to the external gear (13).

6. The ultrasonic guided wave non-destructive testing device for power transmission lines according to claim 2, characterized in that, A controller (6) is installed on the bracket (4), and the controller (6) is used to control the rotation of the turntable (30).

7. The ultrasonic guided wave non-destructive testing device for power transmission lines according to claim 1, characterized in that, A slide rod (21) is installed on the slider (20), and the slide rod (21) is slidably disposed in the spiral groove (19). A slide plate (22) is installed on the side wall of the slider (20). A limit rod (23) is movably installed through the slide plate (22), and a limit seat (24) is installed at both ends of the limit rod (23). The limit seat (24) is installed on the turntable (30), and a fixed seat (29) is installed on the turntable (30). The fixed seat (29) is connected to the light rod (28).

8. A damage identification method for an ultrasonic guided wave nondestructive testing device for power transmission lines, characterized in that, An ultrasonic guided wave nondestructive testing device for power transmission conductors, as described in any one of claims 1 to 7, comprises the following steps for damage identification: Step 1: Clean the surface of the target section of the power transmission line to be tested, removing oil, rust and debris attached to the surface; check the probe status of the ultrasonic transceiver (26), the connection stability of the drive motor (14) and the operating status of the controller (6), and calibrate the parameters of the ultrasonic transceiver (26) through the controller (6) to set the ultrasonic guided wave transmission frequency and amplitude parameters that are compatible with the power transmission line to be tested; Step 2: Place the base (5) on a flat area of ​​the testing site and ensure the overall stability of the device by using the anti-slip pad at the bottom of the base (5); loosen the bolts on the support column (2), adjust the insertion depth of the top column (3) in the support column (2) so that the central axis of the positioning cover (1) is aligned with the axis of the power transmission line to be tested, tighten the bolts to fix the position of the top column (3) and achieve device height positioning; Step 3: Insert the power transmission wire to be tested into the inner cavity of the positioning sleeve (7) at both ends of the positioning cover (1) in sequence, so that the wire is in the center position inside the positioning cover (1); rotate the knob at the end of the threaded rod (10) to drive the positioning frame (9) to move along the guide rod (11) until each guide wheel (8) is in contact with the outer surface of the wire, and the three pairs of clamping components form a limiting and fixing of the wire, and the insert plate (12) prevents the positioning frame (9) from detaching from the insert rod (11). Step 4: Start the drive motor (14) through the controller (6). The drive motor (14) drives the external gear (13) to rotate. Through the meshing transmission of the internal gear ring (31), the turntable (30) rotates along the guide rail (16) and the support (17). When the turntable (30) rotates, the slide rod (21) slides along the spiral groove (19), and the light rod (28) slides along the strip groove (27), so that the ultrasonic transceiver (26) rotates around the circumference of the wire and adjusts the detection angle in real time. The ultrasonic transceiver (26) emits ultrasonic guided waves and receives reflected signals, converts the reflected signals into electrical signals and transmits them to the processing module. Step 5: The processing module performs filtering and noise reduction preprocessing on the electrical signal, compares the preprocessed signal with the ultrasonic guided wave signal template of the normal conductor, and analyzes the amplitude, propagation time and waveform characteristics of the reflected signal. Based on the signal characteristic abrupt change, combined with the detection position and angle information of the ultrasonic transceiver (26), the location, type and size of the wire damage are determined, and damage identification is completed.

Images