Cable fault detection device and detection method

Abstract

The present invention discloses a cable fault detection device and a detection method, which belong to the field of cable fault detection. A cable fault detection device includes a fault detection vehicle, a fault detector, an ultrasonic probe and a soundproof cover. The present invention, through the downward sliding of the lifting plate, on the one hand, uses a telescopic airbag and a paving plate to pave the ground in the forward direction of the cable detection, so as to prevent the uneven ground from causing the ultrasonic wave to be reflected, refracted or absorbed by the uneven parts of the ground, thereby reducing the impact of the uneven ground on the ultrasonic detection and ensuring the accuracy and reliability of the detection. On the other hand, it can blow air to the outer surface of the soundproof cover to clean the outer surface of the soundproof cover to prevent the presence of dust from affecting the sound insulation performance of the soundproof cover. At the same time, the airflow will form an air film effect on the outer surface of the soundproof cover, further improving the sound insulation performance of the soundproof cover, thereby reducing the interference or covering of the external noise on the ultrasound and improving the accuracy of the ultrasonic detection.

Description

Technical Field

[0001] The present invention relates to the technical field of cable fault detection, and in particular to a cable fault detection device and a detection method. Background Art

[0002] Cable fault detection is an important part of ensuring the normal operation of power systems and communication systems. When a cable fails, being able to quickly and accurately locate the fault point and determine the fault type is of great significance for maintaining power grid safety and improving power supply reliability. The following are the main steps and common methods of cable fault detection: Fault monitoring: Detect abnormal conditions of the cable system through protection devices, monitoring systems or manual inspections. Fault type determination: Short circuit fault: Direct electrical connection occurs between two cable conductors. Open circuit fault: One or more conductors of the cable are disconnected. Poor contact: Poor contact between the conductor and the shield or insulation layer. Insulation aging or damage: The insulation performance of the insulation layer is reduced due to aging or external force damage. Fault location: Use fault detection equipment such as high-voltage bridges, time domain reflectometry (TDR) instruments, frequency domain reflectometry (FDR) instruments, acoustic testing methods, etc. to determine the location of the fault point. Fault detection and isolation: Use special fault detection instruments, such as portable fault testers, to test and locate the cable. After determining the fault point, isolate the fault point to isolate the normal part from the faulty part to prevent the fault from expanding. Fault repair: Repair the isolated fault point or replace the faulty cable segment. Perform necessary tests after repair to ensure the cable is back in working order.

[0003] At present, when performing fault detection on underground cables, during ultrasonic detection, due to the uneven ground, sound waves may encounter obstacles and be reflected or scattered, interfering with the propagation of the sound wave signal generated by the fault point, making it difficult to accurately determine the fault location. In addition, due to the presence of noise in the external environment, the noise will interfere with or cover the ultrasonic signal, thereby affecting the detection accuracy. Based on this, a cable fault detection device and detection method are proposed. Summary of the invention

[0004] The purpose of the present invention is to solve the problems in the prior art that when performing ultrasonic detection, due to the uneven ground, the sound waves may encounter obstacles and be reflected or scattered, interfering with the propagation of the sound wave signal generated by the fault point, making it difficult to accurately determine the fault location, and due to the existence of noise in the external environment, the noise will interfere with or cover the ultrasonic signal, thereby affecting the accuracy of the detection, and a cable fault detection device and detection method are proposed.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A cable fault detection device includes a fault detection vehicle, a fault detector and an ultrasonic probe, and also includes: a sound insulation cover fixedly connected to the fault detection vehicle, the sound insulation cover is arranged on the periphery of the ultrasonic probe, and is used to isolate external noise from the ultrasonic wave emitted by the ultrasonic probe; a lifting plate arranged on the fault detection vehicle, the bottom of the lifting plate is fixedly connected to a telescopic airbag, the bottom of the telescopic airbag is fixedly connected to a paving plate, and the paving plate is used to pave the raised parts of the ground.

[0007] In order to make the paving plate move up and down, the ground in the direction of cable fault detection is paved to reduce the influence of uneven ground on ultrasonic detection, preferably, it also includes a motor installed on the top of the fault detection vehicle, the output end of the motor is fixedly connected to a rotating shaft, the bottom of the rotating shaft is fixedly connected to a reciprocating screw, the reciprocating screw is threadedly connected to a piston plate, the bottom of the piston plate is fixedly connected to a connecting column, wherein the reciprocating screw is rotatably connected to the fault detection vehicle, the connecting column passes through the fault detection vehicle and is slidably connected to the fault detection vehicle, and the connecting column is fixedly connected to the top of the lifting plate.

[0008] In order to reduce the dust inside the soundproof cover and prevent the presence of dust from affecting the accuracy of ultrasonic detection of cable faults, the squeezing force of the paving plate on the ground is a slowly increasing pressure, thereby reducing the generation of dust when the ground is paved. Furthermore, it also includes a piston cylinder fixedly connected to the fault detection vehicle, the interior of the piston cylinder is fixedly connected to a limit baffle, both sides of the piston cylinder are fixedly connected with a dust extraction air pipe, the end of the dust extraction air pipe away from the piston cylinder is fixedly connected with a dust extraction air ring, and the dust extraction air ring is provided with an exhaust hole, wherein the piston plate is slidably connected in the piston cylinder, the connecting column is provided with an exhaust groove, the telescopic air bag is connected to the piston cylinder through the exhaust groove, and the rotating shaft passes through the piston cylinder and is rotatably connected to the piston cylinder.

[0009] Furthermore, the dust extraction air ring is fixedly connected to the inner bottom of the sound insulation cover, and the dust extraction air pipe passes through the fault detection vehicle and is fixedly connected to the fault detection vehicle.

[0010] In order to clean the outer surface of the ultrasonic probe and prevent dust from adhering to the ultrasonic probe, which would cause corrosion to the ultrasonic probe and affect the service life of the ultrasonic probe, the ultrasonic probe further includes a rotating bin fixedly connected to the dust extraction air pipe, a transmission shaft is rotatably connected in the rotating bin, a blade is fixedly connected to the portion of the transmission shaft located in the rotating bin, a transmission worm is fixedly connected to the end of the transmission shaft, wherein a rotating worm wheel is rotatably connected to the ultrasonic probe, a cleaning rod is fixedly connected to the bottom of the rotating worm wheel, the rotating worm wheel is meshed with the transmission worm, and the cleaning rod is in contact with the ultrasonic probe.

[0011] In order to clean the sound insulation cover and prevent dust from adhering to the outer surface of the sound insulation cover, which affects the penetration of sound waves, increases the reflection frequency of sound waves, and reduces the sound insulation effect, the interference or masking of ultrasonic waves by external noise is reduced, and the accuracy and quality of detection are improved. Furthermore, it also includes an injection chamber opened in the fault detection vehicle, and the air injection chamber is rotatably connected to a limit swivel, and the bottom of the limit swivel is fixedly connected to an annular air chamber, and the bottom of the annular air chamber is fixedly connected to an air blowing brush rod, and an air hole is opened on the inner arc surface of the air blowing brush rod, and the outer side wall of the annular air chamber is fixedly connected to a second gear, wherein the outer side wall of the rotating shaft is fixedly connected to a first gear, the first gear is meshed with the second gear, the air blowing brush rod is in contact with the sound insulation cover, and the air hole is opened on the side where the air blowing brush rod is in contact with the sound insulation cover.

[0012] Furthermore, an air injection pipe is fixedly connected to the top of the fault detection vehicle, an overflow valve is installed in the air injection pipe, and an end of the air injection pipe away from the fault detection vehicle is fixedly connected to a connecting hose, and the end of the connecting hose away from the air injection pipe is fixedly connected to the telescopic airbag.

[0013] Furthermore, the connecting hose is communicated with the telescopic airbag, and the air injection pipe is communicated with the air injection chamber.

[0014] Furthermore, a handle is installed on the top of the fault detection vehicle, a fault detector is installed on the top of the fault detection vehicle, the ultrasonic probe is installed at the bottom of the fault detector, a control computer is installed on the top of the fault detector, and the ultrasonic probe, fault detector and motor are all controlled by the control computer.

[0015] A cable fault detection method comprises the following steps:

[0016] Step 1: Push the fault detection vehicle onto the ground where the cables are laid by holding the handle, and place the ultrasonic probe directly above the cables;

[0017] Step 2: Start the ultrasonic probe and motor by controlling the computer, and push the fault detection vehicle along the cable to be detected by holding the handle to perform fault detection on the cable;

[0018] Step 3: The motor is used to make the paving plate level the ground above the cable to be inspected;

[0019] Step 4: The fault detector determines whether the cable is faulty based on the ultrasonic signal and displays it in real time through the control computer;

[0020] Step 5: After the test is completed, turn off the ultrasonic probe and motor.

[0021] Compared with the prior art, the present invention provides a cable fault detection device and detection method, which have the following beneficial effects:

[0022] 1. The cable fault detection device, through the downward sliding of the lifting plate, on the one hand, flattens the ground in the forward direction of the cable detection through the telescopic airbag and the paving plate, so as to prevent the uneven ground from causing the ultrasonic wave to be reflected, refracted or absorbed by the uneven parts of the ground, thereby reducing the influence of the uneven ground on the ultrasonic detection and ensuring the accuracy and reliability of the detection; on the other hand, it can blow air to the outer surface of the sound insulation cover to clean the outer surface of the sound insulation cover to prevent the presence of dust from affecting the sound insulation performance of the sound insulation cover. At the same time, the airflow will form an air film effect on the outer surface of the sound insulation cover, further improving the sound insulation performance of the sound insulation cover, thereby reducing the interference or masking of the external noise on the ultrasound and improving the accuracy of the ultrasonic detection.

[0023] 2. The cable fault detection device draws air inside the soundproof cover through a dust extraction air pipe, which can reduce the dust inside the soundproof cover caused by the paving plate leveling the ground and the dust generated by the flow of external air, and prevent the dust inside the soundproof cover from affecting the ultrasonic detection path and the accuracy of ultrasonic cable fault detection, thereby ensuring the stability of the ultrasonic detection path, improving the detection accuracy, and ensuring the reliability of the detection.

[0024] 3. The cable fault detection device enables the cleaning rod to rotate along the outer surface of the ultrasonic probe through the flow of air in the dust extraction air pipe, so that the cleaning rod can clean the dust attached to the outer surface of the ultrasonic probe, thereby preventing the long-term attachment of dust on the outer surface of the ultrasonic probe from corroding the ultrasonic probe and affecting the service life of the ultrasonic probe, thereby achieving good protection of the ultrasonic probe. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the front three-dimensional structure of a cable fault detection device proposed by the present invention;

[0026] Figure 2 A schematic diagram of the bottom three-dimensional structure of a cable fault detection device proposed by the present invention;

[0027] Figure 3 A three-dimensional partially cutaway structural schematic diagram of a cable fault detection device proposed by the present invention;

[0028] Figure 4 A schematic diagram of the structure of a cable fault detection device proposed by the present invention with the front center section opened;

[0029] Figure 5 A cable fault detection device proposed by the present invention Figure 4 The enlarged structural diagram at A in the middle;

[0030] Figure 6 A cable fault detection device proposed by the present invention Figure 4 The enlarged structural diagram at B in the middle;

[0031] Figure 7 A schematic diagram of the side cross-section structure of a cable fault detection device proposed by the present invention;

[0032] Figure 8 This is a schematic diagram of the three-dimensional structure of an ultrasonic probe of a cable fault detection device proposed by the present invention.

[0033] In the figure: 1. Fault detection vehicle; 2. Handle; 3. Fault detection instrument; 4. Control computer; 5. Ultrasonic probe; 6. Soundproof cover; 7. Motor; 8. Rotating shaft; 9. Reciprocating screw; 10. Piston cylinder; 11. Piston plate; 12. Connecting column; 13. Lifting plate; 14. Telescopic air bag; 15. Paving plate; 16. Limit baffle; 17. Dust extraction air pipe; 18. Dust extraction air ring; 19. Air extraction hole; 20. Exhaust groove; 21. Rotating bin; 22. Blade; 23. Transmission shaft; 24. Transmission worm; 25. Rotating worm wheel; 26. Cleaning rod; 27. First gear; 28. Second gear; 29. ​​Annular air chamber; 30. Limiting swivel; 31. Blowing brush rod; 32. Blowing hole; 33. Connecting hose; 34. Air injection pipe; 35. Air injection chamber. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0035] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0036] Example:

[0037] Reference Figure 1-Figure 5 , Figure 7A cable fault detection device includes a fault detection vehicle 1, a fault detector 3 and an ultrasonic probe 5, wherein a handle 2 is installed on the top of the fault detection vehicle 1, a fault detector 3 is installed on the top of the fault detection vehicle 1, the ultrasonic probe 5 is installed at the bottom of the fault detector 3, and a control computer 4 is installed on the top of the fault detector 3. The device also includes: a soundproof cover 6 fixedly connected to the fault detection vehicle 1, the soundproof cover 6 is arranged on the periphery of the ultrasonic probe 5, and is used to isolate external noise from the ultrasonic wave emitted by the ultrasonic probe 5; a lifting plate 13 arranged on the fault detection vehicle 1, a telescopic airbag 14 is fixedly connected to the bottom of the lifting plate 13, and the bottom of the telescopic airbag 14 is fixedly connected to It is connected to a paving plate 15, which is used to pave the raised parts of the ground. It also includes a motor 7 installed on the top of the fault detection vehicle 1. The ultrasonic probe 5, the fault detector 3, and the motor 7 are all controlled by the control computer 4. The output end of the motor 7 is fixedly connected to a rotating shaft 8, and the bottom of the rotating shaft 8 is fixedly connected to a reciprocating screw 9. The reciprocating screw 9 is connected to a piston plate 11 through a thread, and the bottom of the piston plate 11 is fixedly connected to a connecting column 12, wherein the reciprocating screw 9 is rotatably connected to the fault detection vehicle 1, the connecting column 12 penetrates the fault detection vehicle 1 and is slidably connected to the fault detection vehicle 1, and the connecting column 12 is fixedly connected to the top of the lifting plate 13.

[0038] When in use, the fault detection vehicle 1 is pushed to the ground where the cable is laid by holding the handle 2, and the ultrasonic probe 5 is located directly above the cable. Then, the fault detector 3, the ultrasonic probe 5 and the motor 7 are started by controlling the computer 4, and the handle 2 is held to push the fault detection vehicle 1 to move along the cable to be detected to perform fault detection on the cable. In the process of performing fault detection on the cable, the motor 7 drives the reciprocating screw 9 to rotate through the rotating shaft 8, so that the piston plate 11 moves up and down under the action of the reciprocating screw 9, and drives the lifting plate 13 to move up and down through the connecting column 12, thereby causing the telescopic airbag 14 and The paving plate 15 moves up and down. When the lifting plate 13 moves downward, the paving plate 15 first contacts the ground. As the lifting plate 13 continues to move downward, the telescopic airbag 14 is squeezed, and the pressure on the ground is slowly increased to achieve the paving operation of the ground. In this process, although the fault detection vehicle 1 is in a moving state, the moving speed is slow, and the telescopic airbag 14 can be deformed, so it does not affect the paving operation of the paving plate 15 on the ground. When the lifting plate 13 moves upward, the telescopic airbag 14 will slowly separate the paving plate 15 from the ground.

[0039] During the movement of the fault detection vehicle 1, when the fault detector 3 detects a change in the signal emitted by the ultrasonic probe 5, and compares it with the fault signal of the cable, if it is determined to be a fault signal, it is displayed through the control computer 4, and the detection personnel can mark the position at this time;

[0040] The paving operation of the ground is realized to prevent the uneven ground from causing the ultrasonic wave to be reflected, refracted or absorbed by the uneven parts of the ground, thereby reducing the impact of the uneven ground on the ultrasonic detection and ensuring the accuracy and reliability of the detection. At the same time, the retractability of the retractable airbag 14 is utilized to reduce the generation of dust when the ground is paved, thereby further improving the accuracy of the detection.

[0041] Reference Figure 1-Figure 4 , Figure 7 , Figure 8 , and also includes a piston cylinder 10 fixedly connected to the fault detection vehicle 1, the interior of the piston cylinder 10 is fixedly connected to a limit baffle 16, dust extraction air pipes 17 are fixedly connected to both sides of the piston cylinder 10, and the end of the dust extraction air pipe 17 away from the piston cylinder 10 is fixedly connected to a dust extraction air ring 18, and a dustproof net is provided at the connecting end of the dust extraction air pipe 17 and the dust extraction air ring 18, and an exhaust hole 19 is opened on the dust extraction air ring 18, wherein the piston plate 11 is slidably connected in the piston cylinder 10, an exhaust groove 20 is opened in the connecting column 12, the telescopic air bag 14 is connected to the piston cylinder 10 through the exhaust groove 20, the rotating shaft 8 passes through the piston cylinder 10 and is rotatably connected to the piston cylinder 10, the dust extraction air ring 18 is fixedly connected to the inner bottom of the sound insulation cover 6, and the dust extraction air pipe 17 passes through the fault detection vehicle 1 and is fixedly connected to the fault detection vehicle 1.

[0042] The rotation of the reciprocating screw 9 drives the piston plate 11 to slide up and down. At this time, the piston plate 11 will slide up and down on the inner surface of the piston cylinder 10. When the piston plate 11 slides downward along the piston cylinder 10, the air inside the piston cylinder 10 will be discharged into the telescopic air bag 14 through the exhaust groove 20 through compression, thereby increasing the pressure of the paving plate 15 on the ground and improving the paving quality. When the piston plate 11 slides to the position where the limit baffle 16 is located, the piston plate 11 will slide upward along the piston cylinder 10 under the rotation of the reciprocating screw 9, thereby causing the piston cylinder 10 to extract dust inside the soundproof cover 6 through the dust extraction air pipe 17, the dust extraction air ring 18 and the air extraction hole 19.

[0043] It can reduce the dust inside the soundproof cover 6 caused by the paving plate 15 leveling the ground and the dust generated by the flow of external air, and prevent the dust inside the soundproof cover 6 from affecting the ultrasonic detection path and the accuracy of ultrasonic cable fault detection, thereby ensuring the stability of the ultrasonic detection path, improving the detection accuracy, and ensuring the reliability of the detection.

[0044] Reference Figure 3 , Figure 6 , Figure 8, and also includes a rotating bin 21 fixedly connected to the dust extraction air pipe 17, a transmission shaft 23 is rotatably connected in the rotating bin 21, a blade 22 is fixedly connected to the portion of the transmission shaft 23 located in the rotating bin 21, and a transmission worm 24 is fixedly connected to the end of the transmission shaft 23, wherein a rotating worm wheel 25 is rotatably connected to the ultrasonic probe 5, a cleaning rod 26 is fixedly connected to the bottom of the rotating worm wheel 25, the rotating worm wheel 25 is meshed with the transmission worm 24, and the cleaning rod 26 is in contact with the ultrasonic probe 5.

[0045] When the airflow flows through the dust extraction air pipe 17, the airflow will act on the blades 22, so that the transmission shaft 23 drives the transmission worm 24 to rotate, and then the rotating worm gear 25 rotates. The rotating worm gear 25 will drive the cleaning rod 26 to rotate along the outer surface of the ultrasonic probe 5 to clean the outer surface of the ultrasonic probe 5;

[0046] The dust attached to the outer surface of the ultrasonic probe 5 is effectively cleaned, and the long-term attachment of dust to the outer surface of the ultrasonic probe 5 is prevented from corroding the ultrasonic probe 5 and affecting the service life of the ultrasonic probe 5, thereby achieving good protection of the ultrasonic probe 5.

[0047] Reference Figure 1-Figure 3 , Figure 5 , Figure 7 , and also includes an injection chamber 35 opened in the fault detection vehicle 1, the injection chamber 35 is rotatably connected with a limited swivel 30, the bottom of the limited swivel 30 is fixedly connected with an annular air chamber 29, the bottom of the annular air chamber 29 is fixedly connected with an air blowing brush rod 31, the inner arc surface of the air blowing brush rod 31 is provided with an air blowing hole 32, and the outer wall of the annular air chamber 29 is fixedly connected with a second gear 28, wherein the outer wall of the rotating shaft 8 is fixedly connected with a first gear 27, the first gear 27 is meshed with the second gear 28, the air blowing brush rod 31 is fitted with the sound insulation cover 6, and the air blowing hole 32 is opened on the side where the air blowing brush rod 31 is in contact with the sound insulation cover 6, and an air injection pipe 34 is fixedly connected to the top of the fault detection vehicle 1, and an overflow valve is installed in the air injection pipe 34. The end of the air injection pipe 34 away from the fault detection vehicle 1 is fixedly connected to a connecting hose 33, and the end of the connecting hose 33 away from the air injection pipe 34 is fixedly connected to the telescopic airbag 14. The overflow valve is in contact with the ground when the paving plate 15 is in contact with the ground, and is opened when the telescopic airbag 14 is subjected to compression force after being fully expanded. The connecting hose 33 is connected to the telescopic airbag 14, and the air injection pipe 34 is connected to the air injection chamber 35.

[0048] When the rotating shaft 8 rotates, the second gear 28 will be driven to rotate through the first gear 27, thereby causing the annular air chamber 29 to rotate. The rotation of the annular air chamber 29 will drive the air blowing brush rod 31 to rotate along the outer surface of the soundproof cover 6 to clean the dust attached to the outer surface of the soundproof cover 6. When the telescopic airbag 14 is fully expanded and squeezed by the lifting plate 13, the overflow valve installed in the air injection pipe 34 will open, so that the gas in the telescopic airbag 14 passes through the connecting hose 33 and the air injection pipe 34 into the air injection chamber 35, and then passes through the limit swivel 30 into the annular air chamber 29, and finally enters the air blowing brush rod 31, and blows to the outer surface of the soundproof cover 6 through the air blowing hole 32;

[0049] The outer surface of the sound insulation cover 6 is cleaned to prevent the presence of dust from affecting the sound insulation performance of the sound insulation cover 6. At the same time, the airflow will form an air film effect on the outer surface of the sound insulation cover 6, further improving the sound insulation performance of the sound insulation cover 6, thereby reducing the interference or masking of external noise on ultrasound and improving the accuracy of ultrasonic detection.

[0050] Reference Figure 1-Figure 8 , a cable fault detection method, comprising the following steps:

[0051] Step 1: Push the fault detection vehicle 1 onto the ground where the cables are laid by holding the handle 2, and place the ultrasonic probe 5 directly above the cables;

[0052] Step 2: Start the ultrasonic probe 5 and the motor 7 by controlling the computer 4, and push the fault detection vehicle 1 along the cable to be detected by holding the handle 2 to perform fault detection on the cable;

[0053] Step 3: The motor 7 operates to make the paving plate 15 pave the ground above the cable to be inspected;

[0054] The operation of the motor 7 will drive the reciprocating screw 9 to rotate through the rotating shaft 8, so that the piston plate 11 moves up and down under the action of the reciprocating screw 9, and the lifting plate 13 is driven to move up and down through the connecting column 12, thereby causing the telescopic airbag 14 and the paving plate 15 to move up and down. In the process of the lifting plate 13 moving downward, the paving plate 15 first contacts the ground. As the lifting plate 13 continues to move downward, the telescopic airbag 14 will be squeezed, slowly increasing the pressure on the ground to achieve the paving operation of the ground. In this process, although the fault detection vehicle 1 is in a moving state, the moving speed is slow, and the telescopic airbag 14 can be deformed, so it will not affect the paving operation of the paving plate 15 on the ground. In the process of the lifting plate 13 moving upward, the telescopic airbag 14 will cause the paving plate 15 to slowly leave the ground.

[0055] The paving operation of the ground is realized to prevent the uneven ground from causing the ultrasonic wave to be reflected, refracted or absorbed by the uneven parts of the ground, thereby reducing the influence of the uneven ground on the ultrasonic wave detection, ensuring the accuracy and reliability of the detection, and at the same time utilizing the retractability of the retractable airbag 14 to reduce the generation of dust when the ground is paved;

[0056] The rotation of the reciprocating screw 9 drives the piston plate 11 to slide up and down. At this time, the piston plate 11 will slide up and down on the inner surface of the piston cylinder 10. When the piston plate 11 slides downward along the piston cylinder 10, the air inside the piston cylinder 10 will be discharged into the telescopic air bag 14 through the exhaust groove 20 by squeezing, thereby increasing the pressure of the paving plate 15 on the ground and improving the paving quality. When the piston plate 11 slides upward along the piston cylinder 10, the piston cylinder 10 will extract the dust inside the soundproof cover 6 through the dust extraction air pipe 17, the dust extraction air ring 18 and the air extraction hole 19.

[0057] It can reduce the dust inside the soundproof cover 6 caused by the paving plate 15 paving the ground and the dust generated by the flow of external air, and prevent the dust inside the soundproof cover 6 from affecting the ultrasonic detection path and the accuracy of ultrasonic detection of cable faults, thereby ensuring the stability of the ultrasonic detection path, improving the detection accuracy, and ensuring the reliability of the detection;

[0058] When the airflow flows through the dust extraction air pipe 17, the airflow will act on the blades 22, so that the transmission shaft 23 drives the transmission worm 24 to rotate, and then the rotating worm gear 25 rotates. The rotating worm gear 25 will drive the cleaning rod 26 to rotate along the outer surface of the ultrasonic probe 5 to clean the outer surface of the ultrasonic probe 5;

[0059] When the rotating shaft 8 rotates, the second gear 28 will be driven to rotate through the first gear 27, thereby causing the annular air chamber 29 to rotate. The rotation of the annular air chamber 29 will drive the air blowing brush rod 31 to rotate along the outer surface of the soundproof cover 6 to clean the dust attached to the outer surface of the soundproof cover 6. When the telescopic airbag 14 is fully expanded and squeezed by the lifting plate 13, the overflow valve installed in the air injection pipe 34 will open, so that the gas in the telescopic airbag 14 passes through the connecting hose 33 and the air injection pipe 34 into the air injection chamber 35, and then passes through the limit swivel 30 into the annular air chamber 29, and finally enters the air blowing brush rod 31, and blows to the outer surface of the soundproof cover 6 through the air blowing hole 32;

[0060] The outer surface of the soundproof cover 6 is cleaned to prevent the presence of dust from affecting the sound insulation performance of the soundproof cover 6. At the same time, the airflow forms an air film effect on the outer surface of the soundproof cover 6, further improving the sound insulation performance of the soundproof cover 6, thereby reducing the interference or covering of external noise on ultrasound and improving the accuracy of ultrasonic detection;

[0061] Step 4: The fault detector 3 determines whether the cable has a fault according to the ultrasonic signal, and displays it in real time through the control computer 4;

[0062] During the movement of the fault detection vehicle 1, when the fault detector 3 detects a change in the signal emitted by the ultrasonic probe 5, and compares it with the fault signal of the cable, if it is determined to be a fault signal, it is displayed through the control computer 4, and the detection personnel can mark the position at this time;

[0063] Step 5: After the detection is completed, turn off the ultrasonic probe 5 and the motor 7.

[0064] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A cable fault detection device, comprising a fault detection vehicle (1), a fault detector (3) and an ultrasonic probe (5), characterized in that: Also includes: A soundproof cover (6) fixedly connected to the fault detection vehicle (1), wherein the soundproof cover (6) is arranged on the periphery of the ultrasonic probe (5) and is used to isolate external noise from the ultrasonic wave emitted by the ultrasonic probe (5); A lifting plate (13) is arranged on the fault detection vehicle (1), the bottom of the lifting plate (13) is fixedly connected to a telescopic airbag (14), the bottom of the telescopic airbag (14) is fixedly connected to a paving plate (15), and the paving plate (15) is used to pave raised parts of the ground; A motor (7) is mounted on the top of the fault detection vehicle (1), wherein the output end of the motor (7) is fixedly connected to a rotating shaft (8), the bottom of the rotating shaft (8) is fixedly connected to a reciprocating screw (9), the reciprocating screw (9) is connected to a piston plate (11) via a thread, and the bottom of the piston plate (11) is fixedly connected to a connecting column (12). The reciprocating screw rod (9) is rotatably connected to the fault detection vehicle (1), the connecting column (12) passes through the fault detection vehicle (1) and is slidably connected to the fault detection vehicle (1), and the connecting column (12) is fixedly connected to the top of the lifting plate (13); A piston cylinder (10) is fixedly connected to the fault detection vehicle (1), the interior of the piston cylinder (10) is fixedly connected to a limit baffle (16), both sides of the piston cylinder (10) are fixedly connected to dust extraction air pipes (17), one end of the dust extraction air pipe (17) away from the piston cylinder (10) is fixedly connected to a dust extraction air ring (18), and the dust extraction air ring (18) is provided with an air extraction hole (19). The piston plate (11) is slidably connected in the piston cylinder (10), an exhaust groove (20) is provided in the connecting column (12), the telescopic air bag (14) is connected to the piston cylinder (10) through the exhaust groove (20), the rotating shaft (8) passes through the piston cylinder (10) and is rotatably connected to the piston cylinder (10), the dust extraction air ring (18) is fixedly connected to the inner bottom of the sound insulation cover (6), and the dust extraction air pipe (17) passes through the fault detection vehicle (1) and is fixedly connected to the fault detection vehicle (1); A rotating bin (21) is fixedly connected to the dust extraction air pipe (17), a transmission shaft (23) is rotatably connected inside the rotating bin (21), a blade (22) is fixedly connected to a portion of the transmission shaft (23) located inside the rotating bin (21), and a transmission worm (24) is fixedly connected to an end of the transmission shaft (23). The ultrasonic probe (5) is rotatably connected to a rotating worm wheel (25), a cleaning rod (26) is fixedly connected to the bottom of the rotating worm wheel (25), the rotating worm wheel (25) is meshed with the transmission worm (24), and the cleaning rod (26) is in contact with the ultrasonic probe (5); An air injection chamber (35) is provided in the fault detection vehicle (1), wherein a limit swivel (30) is rotatably connected in the air injection chamber (35), an annular air chamber (29) is fixedly connected to the bottom of the limit swivel (30), an air blowing brush rod (31) is fixedly connected to the bottom of the annular air chamber (29), an air blowing hole (32) is provided on the inner arc surface of the air blowing brush rod (31), and a second gear (28) is fixedly connected to the outer wall of the annular air chamber (29). The outer wall of the rotating shaft (8) is fixedly connected to a first gear (27), the first gear (27) is meshed with a second gear (28), the air blowing brush rod (31) is in contact with the sound insulation cover (6), and the air blowing hole (32) is provided on a side where the air blowing brush rod (31) is in contact with the sound insulation cover (6).

2. A cable fault detection device according to claim 1, characterized in that: The top of the fault detection vehicle (1) is fixedly connected to an air injection pipe (34), an overflow valve being installed in the air injection pipe (34), an end of the air injection pipe (34) away from the fault detection vehicle (1) being fixedly connected to a connecting hose (33), and an end of the connecting hose (33) away from the air injection pipe (34) being fixedly connected to a telescopic airbag (14).

3. A cable fault detection device according to claim 2, characterized in that: The connecting hose (33) is in communication with the telescopic airbag (14), and the air injection pipe (34) is in communication with the air injection chamber (35).

4. A cable fault detection device according to claim 1, characterized in that: A handle (2) is installed on the top of the fault detection vehicle (1), a fault detector (3) is installed on the top of the fault detection vehicle (1), the ultrasonic probe (5) is installed at the bottom of the fault detector (3), and a control computer (4) is installed on the top of the fault detector (3); the ultrasonic probe (5), the fault detector (3), and the motor (7) are all controlled by the control computer (4).

5. A cable fault detection method, using a cable fault detection device according to any one of claims 1 to 4, characterized in that: The steps include: Step 1: Push the fault detection vehicle (1) onto the ground on which the cable is laid by holding the handle (2), and place the ultrasonic probe (5) directly above the cable; Step 2: Start the ultrasonic probe (5) and the motor (7) by controlling the computer (4), and push the fault detection vehicle (1) along the cable to be detected by holding the handle (2) to perform fault detection on the cable; Step 3: The motor (7) operates to cause the paving plate (15) to pave the ground above the cable to be inspected; Step 4: The fault detector (3) determines whether the cable has a fault based on the ultrasonic signal and displays it in real time through the control computer (4); Step 5: After the detection is completed, turn off the ultrasonic probe (5) and the motor (7).

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