Magnetostriction longitudinal ultrasonic guided wave excitation device and ground wire damage detection method

Abstract

The invention is suitable for the technical field of power system maintenance, and provides a magnetostriction longitudinal ultrasonic guided wave excitation device and a ground wire damage detection method, the device comprises a box body and a connecting box slidably arranged on the box body; the mounting seat is fixedly mounted at the bottom of the inner wall of the box body; the group of threaded cylinders are rotationally mounted in the connecting box and on the mounting seat respectively, and threaded rods are mounted on the group of threaded cylinders in a threaded manner; the exciting coil and the receiving coil are respectively arranged on the group of threaded rods and are used for conducting ground wire damage detection; the bias magnetic field device is arranged at the bottom of the box body and is used for providing a bias magnetic field for the excitation coil; and the mounting mechanism is arranged on the box body and the group of threaded cylinders and is used for fixing the exciting coil and the receiving coil on the ground wire. The magnetostriction longitudinal ultrasonic guided wave excitation device and the ground wire damage detection method provided by the scheme have the advantages that the distance between the excitation coil and the receiving coil can be quickly adjusted, the installation efficiency is further improved, the installation process is simplified, and the device is convenient to carry and use.

Description

Technical Field

[0001] The invention belongs to the technical field of power system maintenance, and in particular relates to a magnetostrictive longitudinal ultrasonic guided wave excitation device and a ground wire damage detection method. Background Art

[0002] The magnetostrictive longitudinal ultrasonic guided wave excitation device is mainly composed of a bias magnetic field device, a coil, a housing, etc. Its working principle is to use the magnetostrictive effect, that is, when the magnetic field acts on the magnetostrictive material, the material will undergo a slight change in length. By applying an alternating current in the coil, an alternating magnetic field can be generated, and then a longitudinal ultrasonic guided wave is excited in the magnetostrictive material to perform damage detection on the ground wire.

[0003] At present, before the existing magnetostrictive longitudinal ultrasonic guided wave excitation device detects the ground wire, it is necessary to use bolts or clamps to fix the excitation coil and the receiving coil on the ground wire, and at the same time, the excitation coil and the receiving coil are separated by a certain distance, and then the ground wire is inspected. However, since both the excitation coil and the receiving coil need to be manually installed on the ground wire by the operator, they cannot be installed automatically. At the same time, when installing the excitation coil and the receiving coil, the distance between the two needs to be measured, resulting in low installation efficiency. Summary of the invention

[0004] The present invention provides a magnetostrictive longitudinal ultrasonic guided wave excitation device and a ground wire damage detection method, aiming to solve the problem raised in the above background technology that the currently used magnetostrictive longitudinal ultrasonic guided wave excitation device cannot quickly adjust the distance between the excitation coil and the receiving coil, and cannot realize automatic installation.

[0005] To solve the above problems, the present invention is implemented as follows: a magnetostrictive longitudinal ultrasonic guided wave excitation device comprises: a box body and a connecting box slidably arranged on the box body; a mounting seat fixedly installed at the bottom of the inner wall of the box body; a group of threaded barrels rotatably installed in the connecting box and on the mounting seat, respectively, and a group of threaded barrels are threadedly installed with threaded rods; an excitation coil and a receiving coil for ground wire damage detection respectively installed on a group of the threaded rods; a bias magnetic field device installed at the bottom of the box body for providing a bias magnetic field for the excitation coil; and an installation mechanism arranged on the box body and a group of threaded barrels for fixing the excitation coil and the receiving coil on the ground wire.

[0006] Preferably, a cover is placed on the top of the box body and the connection box, a lock is fixedly installed on one side of the box body and the connection box, and a group of hooks is installed on the cover, and a group of the hooks is adapted to a group of the locks.

[0007] Preferably, the mounting mechanism comprises: a support frame fixedly mounted on the connecting box and the box body; a guide telescopic rod rotatably mounted on the support frame; a plurality of first bevel gears respectively arranged on the guide telescopic rod, the box body, the connecting box and a group of threaded cylinders, the plurality of first bevel gears being meshed with each other; a motor fixedly mounted on one side of the box body, the output shaft of the motor being fixedly connected to the output rod of the first bevel gear located on one side of the inner wall of the box body.

[0008] Preferably, guide rods are fixedly installed in the box body and the connection box, a group of guide rods are slidably installed with guide plates, and a group of guide plates are fixedly connected to the excitation coil and the receiving coil respectively.

[0009] Preferably, a slide groove is provided on one side of the inner wall of the connection box, a slide rod is fixedly installed in the slide groove, a slider is slidably installed on the slide rod, and one side of the slider is fixedly connected to the inner wall of the box.

[0010] Preferably, a rack is fixedly installed on one side of the connecting box, a driven gear is rotatably installed on one side of the box body, the driven gear is meshed with the rack, a clamping plate is rotatably installed on one side of the box body, the clamping plate is located on one side of the driven gear, one side of the clamping plate is in contact with the teeth of the driven gear, and the clamping plate is arranged in an inclined shape.

[0011] Preferably, a guide block is fixedly installed on one side of the box body, and the guide block is slidably connected to the rack. A mounting plate is fixedly installed on one side of the box body, and a return spring is fixedly installed on the top of the mounting plate. The top of the return spring is fixedly connected to the clamping plate.

[0012] Preferably, a connecting box is fixedly installed on one side of the box body, and the connecting box cover is arranged on the rack and the driven gear. A connecting cylinder is fixedly installed on one side of the box body, and a pull rod is slidably installed on the connecting cylinder. A connecting rope is installed at one end of the pull rod, and the connecting rope is fixedly connected to the clamping plate.

[0013] Preferably, a screw rod is threadedly installed on the top of the connection box, a pressure block is fixedly installed on the bottom end of the screw rod, the pressure block is located above the pull rod, and an anti-slip pad is provided on the pressure block.

[0014] Preferably, a U-shaped opening is provided on the top of the box body and the connecting box, and the two U-shaped openings are arranged opposite to each other. A mounting block is fixedly installed on one side of the box body and the connecting box. A group of the mounting blocks are rotatably installed with a bidirectional screw. A group of connecting blocks are threadedly sleeved on the bidirectional screw. A splint is fixedly installed on the top of a group of the connecting blocks, and one side of the splint is arranged in an arc shape. A group of the splints is located on one side of the U-shaped opening, and a cushion is fixedly installed on one side of the splint.

[0015] Preferably, sprockets are provided on the box body, the connecting box and the output rod of the first bevel gear located on the box body and the connecting box, a group of the sprockets are sleeved with chains, a group of the sprockets and the chain are meshed, the output rod of the sprocket located above and one end of the bidirectional screw are fixedly sleeved with a second bevel gear, a group of the second bevel gears are meshed, a limit plate is fixedly installed on one side of the mounting block, and the limit plate is in sliding contact with the bottom of a group of the connecting blocks.

[0016] Preferably, the ground wire damage detection method of the magnetostrictive longitudinal ultrasonic guided wave excitation device comprises the following steps:

[0017] Step 1: First, place the device on the ground wire, then slide the connection box so that it slides along the box body. At the same time, the connection box drives the receiving coil to slide synchronously when sliding. When the connection box slides to the limit position, the connection box can be fixed. At this time, the distance between the excitation coil and the receiving coil is adjusted;

[0018] Step 2: When the position of the connection box needs to be adjusted, pull the pull rod to rotate the card plate to disengage from the teeth of the driven gear, and then the connection box can move under the meshing action of the rack and the driven gear. After moving to the desired position, release the card plate, and it will automatically snap into place between the teeth of the driven gear to achieve locking. When the connection box slides, the connection box drives the slider to slide on the slide rod, thereby driving the connection box and the receiving coil inside it to adjust the position, and adjust the distance between the excitation coil and the receiving coil;

[0019] Step 3: Start the motor, so that the output shaft of the motor drives the first bevel gear to rotate, and through the meshing operation of a group of first bevel gears, the first bevel gear drives the threaded barrel to rotate. When the threaded barrel rotates, the threaded rod slides up, thereby driving the excitation coil and the receiving coil to slide on the ground wire, thereby completing the installation of the excitation coil and the receiving coil;

[0020] Step 4: Through an external control system, the excitation coil is controlled to apply an alternating current to excite a longitudinal ultrasonic guided wave that propagates along the ground wire, and the ultrasonic guided wave signal is analyzed to determine the location, size and type of the damage;

[0021] Step 5: When the motor drives the first bevel gear to rotate, the output rod of the first bevel gear also drives the sprocket to rotate, and through the meshing action of the chain, it also drives the second bevel gear to rotate, so that the second bevel gear drives the bidirectional screw to rotate, so that the threaded rod drives the excitation coil and the receiving coil to slide up and connect with the ground wire. At the same time, the bidirectional screw drives the clamp to slide and clamp the ground wire to fix the box body and the connection box.

[0022] Compared with the related art, the magnetostrictive longitudinal ultrasonic guided wave excitation device and ground wire damage detection method provided by the present invention have the following beneficial effects:

[0023] Compared with the prior art, the magnetostrictive longitudinal ultrasonic guided wave excitation device and ground wire damage detection method provided by the present invention can conveniently install the excitation coil and the receiving coil on the ground wire through the design of the threaded barrel and the threaded rod, and can quickly adjust the spacing between the excitation coil and the receiving coil through the sliding connection between the connecting box and the box body, without manual measurement, thereby improving the installation efficiency. The longitudinal ultrasonic guided wave excited by the magnetostrictive effect can propagate in the ground wire and detect damage, with high detection accuracy.

[0024] In summary, the magnetostrictive longitudinal ultrasonic guided wave excitation device and ground wire damage detection method of the present invention have the advantages of being able to quickly adjust the distance between the excitation coil and the receiving coil, thereby improving installation efficiency, while simplifying the installation process and being easy to carry and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the main cross-sectional structure of a magnetostrictive longitudinal ultrasonic guided wave excitation device provided by the present invention;

[0026] Figure 2 It is a rear cross-sectional structural schematic diagram of a magnetostrictive longitudinal ultrasonic guided wave excitation device provided by the present invention;

[0027] Figure 3 It is a side cross-sectional structural schematic diagram of the connection box provided by the present invention;

[0028] Figure 4 It is a side view cross-sectional structural schematic diagram of the box body provided by the present invention;

[0029] Figure 5 It is an assembly diagram of the middle box, the connection box and the slider provided by the present invention;

[0030] Figure 6 It is an assembly diagram of the motor, the first bevel gear, the sprocket and the chain provided by the present invention;

[0031] Figure 7 It is an assembly diagram of the middle sprocket, chain and limiting wheel provided by the present invention;

[0032] Figure 8 A three-dimensional structural schematic diagram of a middle guide telescopic rod is provided for the present invention;

[0033] Fig. 9 for Figure 3 An enlarged structural diagram of part A shown in FIG.

[0034] Fig.10 for Figure 2 Schematic diagram of the enlarged structure of part B shown in FIG.

[0035] 1. The camshaft is a gear having two guide wheels, one for the guide wheel and the other for the receiving wheel. The camshaft is a gear having two guide wheels, one for the guide wheel and the other for the receiving wheel. The camshaft is a gear having two guide wheels, one for the guide wheel and the other for the receiving wheel. DETAILED DESCRIPTION

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field of the present application; the terms used in the specification of the application herein are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "including" and "having" in the specification and claims of the present application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of the present application or the above-mentioned figures are used to distinguish different objects, rather than to describe a specific order; the terms "inside", "outside", "left", and "right" indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0037] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0038] The embodiment of the present invention provides a magnetostrictive longitudinal ultrasonic guided wave excitation device, such as Figure 1-10As shown, the magnetostrictive longitudinal ultrasonic guided wave excitation device includes: a box body 1 and a connecting box 2 slidably arranged on the box body 1; a mounting seat 3 fixedly installed on the bottom of the inner wall of the box body 1; a group of threaded barrels 4 rotatably installed in the connecting box 2 and on the mounting seat 3, and a group of threaded barrels 4 are threadedly installed with threaded rods 39; an excitation coil 5 and a receiving coil 6 for ground wire damage detection are respectively installed on a group of the threaded rods 39; a bias magnetic field device 28 installed at the bottom of the box body 1 for providing a bias magnetic field for the excitation coil 5; and a mounting mechanism provided on the box body 1 and the group of threaded barrels 4 for fixing the excitation coil 5 and the receiving coil 6 on the ground wire.

[0039] In this embodiment, when working, first slide the connection box 2 so that the connection box 2 slides along the box body 1. At the same time, the connection box 2 drives the receiving coil 6 to slide synchronously when sliding. When the connection box 2 slides to the limit position, the connection box 2 can be fixed. At this time, the spacing between the excitation coil 5 and the receiving coil 6 is adjusted. Then, the box body 1 and the connection box 2 are set on the ground wire through the U-shaped opening, and then the cover 7 is covered to fix the device on the ground wire. Then, the installation mechanism is started to drive the adjustment threaded cylinder 4 to rotate, so that the threaded rod 39 drives the excitation coil 5 and the receiving coil 6 to slide up and fix them on the ground wire.

[0040] Then, the external control system is operated to control the excitation coil 5 to pass an alternating current, so as to generate an alternating magnetic field around the magnetostrictive material in the box 1. The magnetic field interacts with the bias magnetic field device 28, causing the magnetostrictive material to vibrate, thereby exciting ultrasonic waves, which are reflected when damaged, and stimulate longitudinal ultrasonic guided waves. These guided waves will propagate along the ground wire and be reflected when damaged (such as cracks, corrosion, etc.). The reflected ultrasonic guided wave signals are received by the receiving coil 6. These signals contain information such as the location and degree of the damage. The received reflected signals are then amplified, filtered, and processed, and appropriate algorithms are used to calculate the ultrasonic guided wave signals. The method is used for analysis. By analyzing the characteristic parameters of the signal such as frequency and amplitude, the location, size and type of damage can be determined. When an alternating current is applied to the excitation coil 5, an alternating magnetic field is generated, which in turn excites longitudinal ultrasonic guided waves in the magnetostrictive material. These guided waves can propagate in the ground wire and are used to detect the damage of the ground wire. Through the design of the threaded barrel 4 and the threaded rod 39, the excitation coil 5 and the receiving coil 6 can be easily installed on the ground wire. Through the sliding connection of the connecting box 2 and the box body 1, it is convenient to quickly adjust the spacing between the excitation coil 5 and the receiving coil 6 without manual measurement, thereby improving the installation efficiency. The longitudinal ultrasonic guided waves excited by the magnetostrictive effect can propagate in the ground wire and detect the damage, with high detection accuracy.

[0041] In a further preferred embodiment of the present invention, a cover 7 is placed on the top of the box body 1 and the connection box 2, a lock 8 is fixedly installed on one side of the box body 1 and the connection box 2, and a group of hooks are installed on the cover 7, and a group of the hooks are adapted to a group of the locks 8.

[0042] In this embodiment, when the device is not in use, or when the box 1 needs to be placed on the ground wire before the detection operation, the cover 7 can be placed on the top of the box 1 and the connection box 2. In order to ensure that the cover 7 is firmly fixed on the box 1 and the connection box 2 to prevent it from being accidentally opened or falling off, a lock 8 is fixedly installed on one side of the box 1 and the connection box 2. At the same time, a group of hooks are installed on the cover 7, and these hooks are adapted to the lock 8. The cover 7 can be firmly locked on the box 1 and the connection box 2 by the cooperation of the hooks and the lock 8. By adding the design of the cover 7 and the lock 8, the components inside the device can be effectively protected from damage during transportation or storage. At the same time, it can also prevent unauthorized personnel from opening the device at will, thereby improving the safety of the device. The design of the cover 7 can not only protect the internal components, but also make the device more tidy and beautiful. When the device is not in use, the cover 7 can be easily covered and locked by the lock 8, which is convenient for carrying and storage. The sealing effect of the cover 7 can also prevent impurities such as dust and moisture from entering the interior of the device, keep the interior of the device clean and dry, and extend the service life of the device.

[0043] In a further preferred embodiment of the present invention, the mounting mechanism includes: a support frame 9 fixedly mounted on the connecting box 2 and the box body 1; a guide telescopic rod 10 rotatably mounted on the support frame 9; a plurality of first bevel gears 11 respectively arranged on the guide telescopic rod 10, the box body 1, the connecting box 2 and a group of threaded tubes 4, and the plurality of first bevel gears 11 are meshed with each other; a motor 12 fixedly mounted on one side of the box body 1, and the output shaft of the motor 12 is fixedly connected to the output rod of the first bevel gear 11 located on one side of the inner wall of the box body 1.

[0044] In this embodiment, when it is necessary to adjust the spacing between the excitation coil 5 and the receiving coil 6, the connecting box 2 is first slid, and the output rod of the guide telescopic rod 10 is extended at the same time. Since a connecting frame is rotatably installed on the output rod of the guide telescopic rod 10, the connecting frame is fixedly connected to the inner wall of the box body 1, thereby ensuring that when the connecting box 2 slides, the output rod of the guide telescopic rod 10 will not drive the first bevel gear 11 to move at the same time, ensuring that a group of first bevel gears 11 will not separate from each other, and then the motor 12 is started, so that the output shaft of the motor 12 drives the first bevel gear 11 to rotate, and through the meshing operation of a group of first bevel gears 11, the first bevel gear 11 is engaged. 11 drives the threaded barrel 4 to rotate. When the threaded barrel 4 rotates, the threaded rod 39 slides up, thereby driving the excitation coil 5 and the receiving coil 6 to slide on the ground wire. At the same time, since the output rod of the guide telescopic rod 10 is arranged in a rectangular shape, when the first bevel gear 11 rotates, the guide telescopic rod 10 will be driven to rotate synchronously at the same time, thereby realizing the synchronous rotation operation of a group of threaded barrels 4, greatly improving the installation efficiency and accuracy. Through the transmission of the motor 12 and the first bevel gear 11, the installation mechanism can automatically fix the excitation coil 5 and the receiving coil 6 on the ground wire without manual operation, which greatly improves the installation efficiency and accuracy.

[0045] In a further preferred embodiment of the present invention, guide rods 13 are fixedly installed in the box body 1 and the connection box 2, a group of guide rods 13 are slidably installed with guide plates 14, and a group of guide plates 14 are fixedly connected to the excitation coil 5 and the receiving coil 6 respectively.

[0046] In this embodiment, when the motor 12 is started and the threaded cylinder 4 is driven to rotate through the transmission of the first bevel gear 11, the threaded rod 39 drives the guide plate 14 to slide along the guide rod 13, thereby making the sliding of the excitation coil 5 and the receiving coil 6 more stable and controllable, thereby ensuring the precise contact and positioning between the coils and the ground wire. The design of the guide rod 13 and the guide plate 14 provides a stable sliding track for the excitation coil 5 and the receiving coil 6, so that the coils can remain stable and controllable when adjusting their positions, avoiding the problem of offset or shaking. Through the cooperation of the guide plate 14 and the guide rod 13, the positions of the excitation coil 5 and the receiving coil 6 can be more accurately controlled, thereby ensuring their precise contact and positioning with the ground wire, thereby improving the accuracy of detection.

[0047] In a further preferred embodiment of the present invention, a slide groove 15 is opened on one side of the inner wall of the connection box 2, a slide rod 16 is fixedly installed in the slide groove 15, a slider 17 is slidably installed on the slide rod 16, and one side of the slider 17 is fixedly connected to the inner wall of the box body 1.

[0048] In this embodiment, when the coil position needs to be adjusted, the connection box 2 is first slid so that the connection box 2 drives the slider 17 to slide on the slide rod 16, thereby driving the connection box 2 and the receiving coil 6 inside it to adjust the position, and adjust the distance between the excitation coil 5 and the receiving coil 6. This sliding adjustment can ensure the optimal contact and positioning between the coil and the ground wire, thereby improving the accuracy of detection. The design of the slide groove 15, the slide rod 16 and the slider 17 provides additional stability for the connection between the box body 1 and the connection box 2, making the entire device more stable and reliable during use. The sliding adjustment of the slider 17 on the slide rod 16 can conveniently adjust the distance between the excitation coil 5 and the receiving coil 6.

[0049] In a further preferred embodiment of the present invention, a rack 18 is fixedly installed on one side of the connecting box 2, a driven gear 19 is rotatably installed on one side of the box body 1, the driven gear 19 is meshed with the rack 18, a clamping plate 20 is rotatably installed on one side of the box body 1, the clamping plate 20 is located on one side of the driven gear 19, one side of the clamping plate 20 is in contact with the teeth of the driven gear 19, and the clamping plate 20 is arranged in an inclined state.

[0050] In this embodiment, when it is necessary to adjust the position of the connection box 2, an external force can be applied to rotate the card plate 20 to disengage the teeth of the driven gear 19, and then the connection box 2 can be moved under the meshing action of the rack 18 and the driven gear 19. After moving to the desired position, release the card plate 20, it will automatically snap into the teeth of the driven gear 19 to achieve locking, and complete the spacing adjustment operation of the excitation coil 5 and the receiving coil 6. At the same time, after use, this device returns the connection box 2 to facilitate storage. Through the meshing relationship between the rack 18 and the driven gear 19, the position of the connection box 2 can be accurately adjusted to ensure the optimal contact and positioning between the excitation coil 5 and the receiving coil 6 and the ground wire. The design of the card plate 20 enables the connection box 2 to be stably locked after being adjusted to the desired position, preventing position displacement due to vibration or external force during use, thereby improving the accuracy and reliability of detection. The connection box 2 can be locked and unlocked by simply rotating the card plate 20, which simplifies the operation process and improves the efficiency of use.

[0051] In a further preferred embodiment of the present invention, a guide block 21 is fixedly installed on one side of the box body 1, and the guide block 21 is slidably connected to the rack 18. A mounting plate is fixedly installed on one side of the box body 1, and a return spring 22 is fixedly installed on the top of the mounting plate, and the top end of the return spring 22 is fixedly connected to the clamping plate 20.

[0052] In this embodiment, the sliding connection between the guide block 21 and the rack 18 ensures that the rack 18 can move smoothly along a certain path to achieve precise motion control. The introduction of the return spring 22 provides the card plate 20 with an automatic reset function, making the entire mechanism more convenient and efficient during operation. For example, during the unlocking process, the card plate 20 may move due to external force. Once the external force disappears, the return spring 22 will immediately pull the card plate 20 back to its original position, limit the driven gear 19, and ensure the stable position of the connection box 2. The entire design cleverly combines components such as the guide block 21, the return spring 22 and the card plate 20 to achieve precise control of the movement of the rack 18 and automatic reset function, thereby improving the reliability and ease of use of the mechanism.

[0053] In a further preferred embodiment of the present invention, a connecting box is fixedly installed on one side of the box body 1, and the connecting box cover is arranged on the rack 18 and the driven gear 19. A connecting cylinder 23 is fixedly installed on one side of the box body 1, and a pull rod 24 is slidably installed on the connecting cylinder 23. A connecting rope 25 is installed at one end of the pull rod 24, and the connecting rope 25 is fixedly connected to the clamping plate 20.

[0054] In this embodiment, when the user needs to slide the connecting box 2, the pull rod 24 is pulled, and the sliding movement of the pull rod 24 will be transmitted to the card plate 20 through the connecting rope 25, so that the card plate 20 moves. The movement of the card plate 20 unlocks the driven gear 19. At the same time, the reset spring 22 is stretched, and then the connecting box 2 can be slid to make the driven gear 19 rotate along the rack 18. After the connecting box 2 slides to the specified position, the connecting rope 25 is released, so that the card plate 20 automatically resets after the tension disappears. The introduction of the connecting box provides a protective shell for the rack 18 and the driven gear 19, extending their service life. Through the design of the pull rod 24 and the connecting rope 25, the user can easily operate the card plate 20 to realize the locking or unlocking function. The reset spring 22 provides the card plate 20 with an automatic reset function, making the entire mechanism more convenient and efficient during operation.

[0055] In a further preferred embodiment of the present invention, a screw rod 26 is threadedly installed on the top of the connection box, a pressure block 27 is fixedly installed on the bottom end of the screw rod 26, the pressure block 27 is located above the pull rod 24, and an anti-slip pad is provided on the pressure block 27.

[0056] In this embodiment, when the pull rod 24 pulls the card plate 20 to rotate, the pull rod 24 slides along the connecting tube 23 at the same time. At this time, one side of the card plate 20 is away from the teeth of the driven gear 19. Then the twist rod 26 is rotated. When the twist rod 26 is rotated and pushed downward, the pressure block 27 will drop and press the pull rod 24 to fix the pull rod 24. At the same time, the card plate 20 remains stationary, which is convenient for sliding the connecting box 2. Through the design of the twist rod 26 and the pressure block 27, the pull rod 24 can be stably pressed to prevent loosening or displacement due to vibration or external force during use, thereby improving the stability and reliability of the device.

[0057] The present invention also provides a method for detecting damage to a ground wire of a magnetostrictive longitudinal ultrasonic guided wave excitation device, comprising the following steps:

[0058] Step 1: First, place the magnetostrictive longitudinal ultrasonic guided wave excitation device on the ground wire, then slide the connection box 2 so that the connection box 2 slides along the box body 1. When the connection box 2 slides, it drives the receiving coil 6 to slide synchronously. At the same time, the connection box 2 drives the slider 17 to slide on the slide rod 16, thereby driving the connection box 2 and the receiving coil 6 inside it to adjust their positions. When the connection box 2 slides to the extreme position, the connection box 2 can be fixed. At this time, the spacing between the excitation coil 5 and the receiving coil 6 is adjusted;

[0059] Step 2: When the position of the connection box 2 needs to be adjusted, pull the pull rod 24, and the sliding movement of the pull rod 24 will be transmitted to the card plate 20 through the connecting rope 25, so that the card plate 20 moves, and the movement of the card plate 20 unlocks the driven gear 19. At the same time, the return spring 22 is stretched, and then the connection box 2 can move under the meshing action of the rack 18 and the driven gear 19. After moving to the desired position, release the card plate 20, and it will automatically snap into the teeth of the driven gear 19 to achieve locking. When the connection box 2 slides, the connection box 2 drives the slider 17 slides on the slide bar 16, thereby driving the connection box 2 and the receiving coil 6 inside to adjust the position, and adjusting the distance between the exciting coil 5 and the receiving coil 6. When the pull rod 24 pulls the card plate 20 to rotate, the pull rod 24 slides along the connection tube 23 at the same time. At this time, one side of the card plate 20 is away from the teeth of the driven gear 19, and then the screw rod 26 is rotated. When the screw rod 26 is rotated and pushed downward, the pressure block 27 will drop and press the pull rod 24 to fix the pull rod 24. At the same time, the card plate 20 remains stationary, which is convenient for sliding the connection box 2;

[0060] Step 3: Start the motor 12, so that the output shaft of the motor 12 drives the first bevel gear 11 to rotate, and through the meshing operation of a group of first bevel gears 11, the first bevel gear 11 drives the threaded barrel 4 to rotate. When the threaded barrel 4 rotates, the threaded rod 39 slides up, thereby driving the excitation coil 5 and the receiving coil 6 to slide on the ground wire. At the same time, the threaded rod 39 drives the guide plate 14 to slide along the guide rod 13, thereby making the excitation coil 5 and the receiving coil 6 slide more smoothly and controllably, thereby ensuring the precise contact and positioning between the coil and the ground wire, so that the excitation coil 5 and the receiving coil 6 are close to the ground wire, and the installation operation of the excitation coil 5 and the receiving coil 6 is completed;

[0061] Step 4: operate the external control system, control the excitation coil 5 to pass an alternating current, generate an alternating magnetic field around the magnetostrictive material in the box 1, and the magnetic field interacts with the bias magnetic field device 28, causing the magnetostrictive material to vibrate, thereby exciting ultrasonic waves, and reflecting when encountering damage, exciting longitudinal ultrasonic guided waves, these guided waves will propagate along the ground wire, and reflect when encountering damage (such as cracks, corrosion, etc.), and use the receiving coil 6 to receive the reflected ultrasonic guided wave signals, which contain information such as the location and degree of damage. Then, the received reflected signal is amplified, filtered, and analyzed using an appropriate algorithm. By analyzing the characteristic parameters of the signal such as frequency and amplitude, the location, size and type of the damage can be determined. When an alternating current is applied to the excitation coil 5, an alternating magnetic field will be generated, thereby exciting longitudinal ultrasonic guided waves in the magnetostrictive material. These guided waves can propagate in the ground wire and are used to detect the damage of the ground wire;

[0062] Step 5: When the motor 12 drives the first bevel gear 11 to rotate, the output rod of the first bevel gear 11 also drives the sprocket 33 to rotate, and through the meshing action of the chain 34, it also drives the second bevel gear 35 to rotate, so that the second bevel gear 35 drives the bidirectional screw 30 to rotate, so that the threaded rod 39 drives the excitation coil 5 and the receiving coil 6 to slide up and connect with the ground wire. At the same time, the bidirectional screw 30 drives the clamping plate 32 to slide and clamp the ground wire to fix the box body 1 and the connection box 2. One side of the clamping plate 32 is arranged in an arc shape, which helps to better adapt to the shape of the ground wire and provide a more stable clamping force. In addition, a soft pad is fixedly installed on one side of the clamping plate 32, which can not only increase the friction between the clamping plate 32 and the ground wire to prevent loosening due to vibration or external force, but also protect the surface of the ground wire from damage.

[0063] In order to further improve the use effect of the device, in addition to the above scheme, this scheme also has the following embodiments:

[0064] In another embodiment of the present invention, a U-shaped opening is provided on the top of the box body 1 and the connecting box 2, and the two U-shaped openings are arranged opposite to each other. A mounting block 29 is fixedly installed on one side of the box body 1 and the connecting box 2, and a group of bidirectional screws 30 are rotatably installed on the mounting blocks 29. A group of connecting blocks 31 are threadedly sleeved on the bidirectional screws 30, and a splint 32 is fixedly installed on the top of a group of connecting blocks 31, and one side of the splint 32 is arranged in an arc shape. A group of splints 32 is located on one side of the U-shaped opening, and a cushion is fixedly installed on one side of the splint 32.

[0065] In this embodiment, when the bidirectional screw 30 rotates, the connecting block 31 will move along the axial direction of the bidirectional screw 30, and the clamping plate 32 is fixedly installed on the top of the connecting block 31, so the clamping plate 32 will also move accordingly, so that the clamping plate 32 clamps the ground wire, thereby fixing the device. One side of the clamping plate 32 is arranged in an arc shape, which helps to better adapt to the shape of the ground wire and provide a more stable clamping force. In addition, a soft pad is fixedly installed on one side of the clamping plate 32, which can not only increase the friction between the clamping plate 32 and the ground wire to prevent loosening due to vibration or external force, but also protect the surface of the ground wire from damage. Through the design of the U-shaped mouth, the bidirectional screw 30, the connecting block 31 and the clamping plate 32, the ground wire can be stably clamped and positioned, ensuring that no displacement or loosening occurs during the detection process, thereby improving the accuracy and reliability of the detection. The clamping plate 32 is arranged in an arc shape and is equipped with a soft pad, which enables the device to adapt to ground wires of different diameters or shapes, thereby improving the applicability and flexibility of the device.

[0066] In another embodiment of the present invention, the box body 1, the connecting box 2 and the output rod of the first bevel gear 11 located on the box body 1 and the connecting box 2 are all provided with sprockets 33, a group of the sprockets 33 are sleeved with chains 34, a group of the sprockets 33 and the chains 34 are meshed, the output rod of the sprocket 33 located above and one end of the bidirectional screw 30 are fixedly sleeved with second bevel gears 35, a group of the second bevel gears 35 are meshed, and a limiting plate 36 is fixedly installed on one side of the mounting block 29, and the limiting plate 36 is in sliding contact with the bottom of a group of the connecting blocks 31.

[0067] In this embodiment, the sprocket 33, chain 34, second bevel gear 35 and limit plate 36 are designed to achieve synchronous rotation between the first bevel gear 11 and the bidirectional screw 30, and further drive the bidirectional screw 30 through the meshing relationship of the second bevel gear 35, so as to achieve synchronous adjustment of the clamping plate 32. When the motor 12 drives the first bevel gear 11 to rotate, the output rod of the first bevel gear 11 also drives the sprocket 33 to rotate, and the meshing action of the chain 34 also drives the second bevel gear 35 to rotate, so that the second bevel gear 35 drives the bidirectional screw 30 to rotate, so that the threaded rod 39 drives the excitation coil 5 and the receiving coil 6 to slide up and connect with the ground wire, and the bidirectional screw 30 drives the clamping plate 32 to slide and clamp the ground wire. In order to fix the box body 1 and the connecting box 2, a limiting wheel 37 is rotatably installed on one side of the box body 1 and the connecting box 2, and the limiting wheel 37 is engaged with the chain 34, so as to limit the chain 34, which is conducive to the smooth rotation of the chain 34. At the same time, a protective cover 38 is installed on the box body and the connecting box 2, and the protective cover 38 is arranged on the sprocket 33 and the chain 34 to protect them and ensure that people do not contact them. Through the design of the sprocket 33 and the chain 34, the synchronous rotation between the output rod of the first bevel gear 11 and the bidirectional screw 30 is achieved, ensuring the coordination and consistency of the entire device. By utilizing the meshing relationship of the second bevel gear 35, the rotation of the upper sprocket 33 is converted into the rotation of the bidirectional screw 30, which simplifies the driving structure and improves the transmission efficiency.

[0068] In summary, compared with the related art, the present device has the advantages of being able to quickly adjust the distance between the excitation coil 5 and the receiving coil 6, thereby improving the installation efficiency, while simplifying the installation process and being easy to carry and use.

[0069] In the several embodiments provided in this application, it should be understood that the disclosed device can be implemented in other ways.

[0070] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the scope of protection of the invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on these embodiments, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in this field can still combine, add, delete or make other adjustments to the features in the various embodiments of the present invention according to the circumstances without conflict, without making creative work, so as to obtain different other technical solutions that do not deviate from the concept of the present invention in essence, and these technical solutions also belong to the scope of protection of the present invention.

Claims

1. A magnetostrictive longitudinal ultrasonic guided wave excitation device, characterized in that: include: A box body (1) and a connection box (2) slidably arranged on the box body (1); A mounting seat (3) fixedly mounted on the bottom of the inner wall of the box (1); A group of threaded barrels (4) are rotatably mounted in the connection box (2) and on the mounting seat (3), and threaded rods (39) are threadedly mounted on each of the group of threaded barrels (4); An excitation coil (5) and a receiving coil (6) respectively mounted on a group of the threaded rods (39) for detecting damage to the ground wire; A bias magnetic field device (28) installed at the bottom of the box (1) and used to provide a bias magnetic field for the excitation coil (5); A mounting mechanism is provided on the box body (1) and a set of threaded cylinders (4) for fixing the excitation coil (5) and the receiving coil (6) on the ground wire.

2. The magnetostrictive longitudinal ultrasonic guided wave excitation device according to claim 1, characterized in that: A cover (7) is placed on the top of the box body (1) and the connection box (2), a lock (8) is fixedly installed on one side of the box body (1) and the connection box (2), and a group of hooks is installed on the cover (7), and a group of the hooks is compatible with a group of the locks (8).

3. The magnetostrictive longitudinal ultrasonic guided wave excitation device according to claim 1, characterized in that: The mounting mechanism comprises: A support frame (9) fixedly mounted in the connection box (2) and the box body (1); A guide telescopic rod (10) rotatably mounted on the support frame (9); A plurality of first bevel gears (11) are respectively arranged on the guide telescopic rod (10), the box body (1), the connection box (2) and a group of threaded cylinders (4), and the plurality of first bevel gears (11) are meshed with each other; A motor (12) is fixedly mounted on one side of the box body (1), and an output shaft of the motor (12) is fixedly connected to an output rod of a first bevel gear (11) located on one side of the inner wall of the box body (1).

4. The magnetostrictive longitudinal ultrasonic guided wave excitation device according to claim 3, characterized in that: Guide rods (13) are fixedly installed in the box body (1) and the connection box (2), and a group of guide rods (13) are slidably installed with guide plates (14), and a group of guide plates (14) are fixedly connected to the excitation coil (5) and the receiving coil (6) respectively.

5. The magnetostrictive longitudinal ultrasonic guided wave excitation device according to claim 1, characterized in that: A slide groove (15) is provided on one side of the inner wall of the connection box (2), a slide rod (16) is fixedly installed in the slide groove (15), a slider (17) is slidably installed on the slider (16), and one side of the slider (17) is fixedly connected to the inner wall of the box body (1).

6. The magnetostrictive longitudinal ultrasonic guided wave excitation device according to claim 1, characterized in that: A rack (18) is fixedly mounted on one side of the connection box (2), a driven gear (19) is rotatably mounted on one side of the box body (1), the driven gear (19) is meshed with the rack (18), a clamping plate (20) is rotatably mounted on one side of the box body (1), the clamping plate (20) is located on one side of the driven gear (19), one side of the clamping plate (20) is in contact with the teeth of the driven gear (19), and the clamping plate (20) is arranged in an inclined state.

7. The magnetostrictive longitudinal ultrasonic guided wave excitation device according to claim 6, characterized in that: A guide block (21) is fixedly mounted on one side of the box body (1), and the guide block (21) is slidably connected to the rack (18). A mounting plate is fixedly mounted on one side of the box body (1), and a return spring (22) is fixedly mounted on the top of the mounting plate, and the top end of the return spring (22) is fixedly connected to the clamping plate (20).

8. The magnetostrictive longitudinal ultrasonic guided wave excitation device according to claim 7, characterized in that: A connecting box is fixedly installed on one side of the box body (1), and the connecting box cover is arranged on the rack (18) and the driven gear (19). A connecting cylinder (23) is fixedly installed on one side of the box body (1), and a pull rod (24) is slidably installed on the connecting cylinder (23). A connecting rope (25) is installed at one end of the pull rod (24), and the connecting rope (25) is fixedly connected to the clamping plate (20).

9. The magnetostrictive longitudinal ultrasonic guided wave excitation device according to claim 8, characterized in that: A screw rod (26) is threadedly mounted on the top of the connection box, a pressure block (27) is fixedly mounted on the bottom end of the screw rod (26), the pressure block (27) is located above the pull rod (24), and an anti-slip pad is provided on the pressure block (27).

10. The method for detecting ground wire damage in a magnetostrictive longitudinal ultrasonic guided wave excitation device according to any one of claims 1 to 9, characterized in that: The steps include: Step 1: firstly, the device is placed on the ground wire, and then the connection box (2) is slid so that the connection box (2) slides along the box body (1). At the same time, the connection box (2) drives the receiving coil (6) to slide synchronously when sliding. When the connection box (2) slides to the limit position, the connection box (2) can be fixed. At this time, the spacing between the exciting coil (5) and the receiving coil (6) is adjusted. Step 2: When the position of the connection box (2) needs to be adjusted, pull the pull rod (24) to rotate the clamping plate (20) to disengage the teeth of the driven gear (19), and then the connection box (2) can be moved under the meshing action of the rack (18) and the driven gear (19). After moving to the desired position, release the clamping plate (20), which will automatically fit between the teeth of the driven gear (19) to achieve locking. When the connection box (2) slides, the connection box (2) drives the slider (17) to slide on the slide rod (16), thereby driving the connection box (2) and the receiving coil (6) inside it to adjust the position, and adjust the distance between the excitation coil (5) and the receiving coil (6); Step 3: Start the motor (12) so that the output shaft of the motor (12) drives the first bevel gear (11) to rotate. Through the meshing operation of a group of first bevel gears (11), the first bevel gear (11) drives the threaded barrel (4) to rotate. When the threaded barrel (4) rotates, the threaded rod (39) slides up, thereby driving the excitation coil (5) and the receiving coil (6) to slide on the ground wire, thereby completing the installation operation of the excitation coil (5) and the receiving coil (6); Step 4: Through an external control system, the excitation coil (5) is controlled to apply an alternating current to excite a longitudinal ultrasonic wave propagating along the ground wire, and the reflected ultrasonic wave signal is received by the receiving coil (6). The ultrasonic wave signal is analyzed to determine the location, size and type of the damage.

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