Low-voltage multi-core cable insulation rapid detection device

Abstract

The invention relates to a low-voltage multi-core cable insulation rapid detection device, and belongs to the technical field of cable insulation detection, the low-voltage multi-core cable insulation rapid detection device comprises a current detection body and a cable body, the current detection body is internally provided with a CPU chip, the CPU chip is connected with an ultrasonic transduction unit through a wire harness, one side of the current detection body is also provided with a probe interface, and the probe interface is connected with the cable body. A probe interface is arranged on the cable body, a probe terminal is installed on the probe interface, the probe terminal is connected with a probe wire, a wire core clamp is arranged on the probe wire, the wire core clamp is further communicated with the ultrasonic transduction unit through the probe interface, and the cable body comprises a wire core layer arranged on the inner side and an insulating layer arranged on the outer side of the wire core layer. The cable body is communicated with the ultrasonic transduction unit through the wire core clamp, the ultrasonic transduction unit comprises a receiver and an emitter, and the ultrasonic transduction unit adopts a high-performance probe to emit ultrasonic pulses with specific frequency to the cable body; the cable insulation layer detection device has the advantage of efficiently, losslessly and accurately realizing all-around rapid detection of the cable insulation layer.

Description

Technical Field

[0001] The invention relates to a low-voltage multi-core cable insulation rapid detection device, belonging to the technical field of cable insulation detection. Background Art

[0002] Low-voltage multi-core cables are usually composed of conductors, insulation layers, shielding layers and sheaths. Among them, the insulation layer is the most critical part. It not only needs to have good electrical properties, but also sufficient mechanical strength and aging resistance. Due to the complex internal structure of the cable, traditional detection methods are often difficult to fully evaluate the state of the insulation layer. Ultrasonic detection technology can achieve all-round detection of the cable insulation layer through non-contact measurement.

[0003] The core of the low-voltage multi-core cable insulation ultrasonic rapid detection technology is to use the propagation characteristics of ultrasonic waves to evaluate the state of the cable insulation layer. Specifically, when ultrasonic waves pass through the interface of different media, reflection and refraction will occur. By analyzing these signals, it can be determined whether the insulation material is aged or damaged.

[0004] Therefore, in view of the above problems, we propose a low-voltage multi-core cable insulation rapid detection device. Summary of the invention

[0005] The purpose of the present invention is to overcome the shortcomings of the prior art and to provide a low-voltage multi-core cable insulation rapid detection device that uses ultrasound to efficiently, non-destructively and accurately perform all-round rapid detection of the cable insulation layer, thereby solving the problems raised in the background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a low-voltage multi-core cable insulation rapid detection device, which includes a current detection body and a cable body, a CPU chip is arranged inside the current detection body, and the CPU chip is connected to an ultrasonic transducer unit through a wiring harness, a probe interface is also arranged on one side of the current detection body, a probe terminal is installed on the probe interface, the probe terminal is connected to a probe wire, a wire core clamp is arranged on the probe wire, and the wire core clamp is also connected to the ultrasonic transducer unit through the probe interface, the cable body includes a wire core layer arranged on the inner side and an insulating layer arranged on the outer side of the wire core layer, and the cable body is connected to the ultrasonic transducer unit through the wire core clamp.

[0007] Preferably, the ultrasonic transducer unit comprises a receiver and a transmitter, and the ultrasonic transducer unit uses a high-performance probe to transmit ultrasonic pulses of a specific frequency to the cable body.

[0008] Preferably, the transmitter transmits ultrasonic waves through an ultrasonic transducer unit and receives echo signals through a receiver, and analyzes parameters such as time delay, amplitude and phase of the echo signals to determine the state of the cable insulation layer.

[0009] Preferably, an operation panel is also provided at the upper end of the current detection body, the CPU chip is arranged inside the operation panel, the CPU chip is also connected to a control unit, a display unit, a power supply unit, a register, a wireless transmission unit and a cloud server, the control unit is connected to control buttons and an adjustment knob on the current detection body, the display unit is connected to a display, the power supply unit is connected to a power interface, the register and the wireless transmission unit are both arranged in the current detection body, and the wireless transmission unit is wirelessly connected to the cloud server.

[0010] Preferably, the register is connected to the wireless transmission unit, and the register and the wireless transmission unit are also connected to a cloud server.

[0011] Preferably, the power supply unit is connected to the electric energy metering chip, the power supply unit is a lithium battery pack, a power supply protection circuit is connected in series between the power supply unit and the electric energy metering chip, and a power supply switch is connected in series between the power supply protection circuit and the power supply unit.

[0012] Preferably, the power supply protection circuit is also connected to the register, an interface circuit is connected in series between the register and the CPU chip, the wireless transmission unit is arranged on the interface circuit, and an edge detection circuit for circuit detection is connected in series between the power supply protection circuit and the interface circuit.

[0013] Preferably, the wire core clamp includes a wire core access end arranged at the inner front end, an internal gear bearing arranged in the middle, and a wire core connection end arranged at the inner rear end connected to the probe wire, and the wire core body passes through the wire core access end and is connected to the wire core connection end.

[0014] Preferably, the inner side of the internal gear bearing is connected to two symmetrically arranged driven gear shafts in the wire core clamp, a bevel gear assembly is arranged between the two driven gear shafts, a screw is arranged at the lower end of the bevel gear assembly, and a semicircular clamp is connected to the lower end of the screw.

[0015] Preferably, the upper end of the screw is arranged on a positioning block close to the bevel gear assembly, the lower end of the screw is provided with a limiting groove on the semicircular clamping plate, and a screw block is fixedly provided inside the semicircular clamping plate.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention clamps any single cable body with two or more mutually insulated or two or more single-core wires intertwined with each other by using two core clamps at one end of the cable body, and emits ultrasonic waves and receives echo signals through an ultrasonic transducer unit, so that the state of the cable insulation layer can be effectively judged, so that it only takes a few minutes to complete the detection of a section of cable, which greatly shortens the maintenance time, and does not need to destroy the cable structure, avoiding secondary damage to the equipment; and uses a high-performance probe to emit ultrasonic pulses of a specific frequency to the cable, and through high-precision sensors and data analysis algorithms, it can accurately identify tiny defects, so that it can effectively prevent the different materials of various parts of the cable, and the use of ultrasonic waves in the internal propagation speed and attenuation degree will also be different. The accuracy of the state detection of the cable insulation layer is improved, and the state of the cable insulation layer is further judged by analyzing the time delay, amplitude and phase of the echo signal. The present invention detects the cable insulation layer by emitting ultrasonic waves and receiving echo signals, so that it can efficiently, non-destructively and accurately realize all-round rapid detection of the cable insulation layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the ultrasonic rapid detection principle of the present invention; Figure 3 is a circuit connection schematic diagram of the power supply unit of the present invention; Figure 4 yes Figure 2 Schematic diagram of the cable core clamp structure.

[0018] In the figure: 1. Current detection body; 2. Operation panel; 3. Control buttons; 4. Display; 5. Adjustment knob; 6. Ultrasonic transducer unit; 7. Probe interface; 8. Probe terminal; 9. Probe line; 10. Wire core clamp; 11. Power interface; 12. Cable body; 13. Wire core layer; 14. Insulation layer; 15. Wire core body; 16. Receiver; 17. Transmitter; 18. CPU chip; 19. Control unit; 20. Display unit; 21. Power supply unit; 22. Register; 23. Wireless transmission unit; 24. Cloud server; 25. Electric energy metering chip; 26. Power supply protection circuit; 27. Power supply switch; 28. Edge detection circuit; 29. ​​Interface circuit; 30. Wire core access end; 31. Internal gear bearing; 32. Driven gear shaft; 33. Wire core connection end; 34. Semicircular splint; 35. Limiting groove; 36. Screw block; 37. Positioning block; 38. Screw; 39. Bevel gear assembly. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention will be clearly and completely described 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; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. Example

[0020] like Figure 1-3 As shown, this embodiment discloses a low-voltage multi-core cable insulation rapid detection device, which includes a current detection body 1 and a cable body 12, wherein a CPU chip 18 is arranged inside the current detection body 1, and the CPU chip 18 is connected to an ultrasonic transducer unit 6 through a wiring harness, and a probe interface 7 is also arranged on one side of the current detection body 1, and a probe terminal 8 is installed on the probe interface 7, and the probe terminal 8 is connected to a probe line 9, and a core clamp 10 is arranged on the probe line 9, and the core clamp 10 is also connected to the ultrasonic transducer unit 6 through the probe interface 7, and the cable body 12 includes a core layer 13 arranged on the inner side and an insulating layer 14 arranged on the outer side of the core layer 13, and the cable body 12 is connected to the ultrasonic transducer unit 6 through the core clamp 10; Among them, an operation panel 2 is also provided at the upper end of the current detection body 1, a CPU chip 18 is arranged inside the operation panel 2, and the CPU chip 18 is also connected to a control unit 19, a display unit 20, a power supply unit 21, a register 22, a wireless transmission unit 23 and a cloud server 24, the control unit 19 is connected to a control button 3 and an adjustment knob 5 on the current detection body 1, the display unit 20 is connected to a display 4, the power supply unit 21 is connected to a power interface 11, the register 22 and the wireless transmission unit 23 are both arranged in the current detection body 1, the wireless transmission unit 23 is wirelessly connected to the cloud server 24, the register 22 and the wireless transmission unit 23 are connected, and the register 22 and the wireless transmission unit 23 are also connected to the cloud server 24; At the same time, the power supply unit 21 is connected to the electric energy metering chip 25. The power supply unit 21 is a lithium battery pack. A power supply protection circuit 26 is also connected in series between the power supply unit 21 and the electric energy metering chip 25. A power supply switch 27 is connected in series between the power supply protection circuit 26 and the power supply unit 21. The power supply protection circuit 26 is also connected to the register 22. An interface circuit 29 is also connected in series between the register 22 and the CPU chip 18. The wireless transmission unit 23 is arranged on the interface circuit 29. An edge detection circuit 28 for circuit detection is also connected in series between the power supply protection circuit 26 and the interface circuit 29.

[0021] In this embodiment, the CPU chip 18 controls the whole, so that the transmitter 17 provided with the ultrasonic transducer unit 6 transmits the original signal, and receives the reflected signal through the receiver 16, and the state of the cable insulation layer can be determined by analyzing the time delay, amplitude and phase of the echo signal; In addition, in a good condition, the frequency response curve of the cable is smooth, but in a faulty condition, fluctuations will occur. By analyzing the fluctuations, the fault type and distance can be determined. At the same time, when a fault occurs, pulse signals will be generated in the cable, and these signals will gradually weaken and distort as the distance increases; by analyzing the pulse signals, the fault location can be determined; When the current passes through the fault point, it will produce an electrothermal effect, causing the surrounding temperature to rise. By measuring the temperature distribution diagram on the cable surface, the fault type and location can be determined; In this embodiment, the power supply unit 21 uses a 18650 lithium battery pack that can provide higher energy density, longer service life, low self-discharge rate, faster charging speed, lighter weight and high safety performance, thereby improving the portability and practicality of the device, and the power supply unit 21 is connected to an electric energy metering chip 25 to monitor the power of the power supply unit 21 in real time, and a power supply protection circuit 26 is connected in parallel to detect the charging and discharging status of the power supply unit 21 in real time, and cut off the circuit when necessary to prevent damage to the battery. Example

[0022] like Figure 1-4 As shown, this embodiment discloses a low-voltage multi-core cable insulation rapid detection device, which includes a current detection body 1 and a cable body 12, wherein a CPU chip 18 is arranged inside the current detection body 1, and the CPU chip 18 is connected to an ultrasonic transducer unit 6 through a wiring harness, and a probe interface 7 is also arranged on one side of the current detection body 1, and a probe terminal 8 is installed on the probe interface 7, and the probe terminal 8 is connected to a probe line 9, and a core clamp 10 is arranged on the probe line 9, and the core clamp 10 is also connected to the ultrasonic transducer unit 6 through the probe interface 7, and the cable body 12 includes a core layer 13 arranged on the inner side and an insulating layer 14 arranged on the outer side of the core layer 13, and the cable body 12 is connected to the ultrasonic transducer unit 6 through the core clamp 10; Among them, the wire core clamp 10 includes a wire core access end 30 arranged at the inner front end, an internal gear bearing 31 arranged in the middle, and a wire core connection end 33 arranged at the inner rear end and connected to the probe wire 9. The wire core body 15 passes through the wire core access end 30 and is connected to the wire core connection end 33. The inner side of the internal gear bearing 31 is connected to two symmetrically arranged driven gear shafts 32 in the wire core clamp 10, and a bevel gear assembly 39 is arranged between the two driven gear shafts 32. A screw 38 is arranged at the lower end of the bevel gear assembly 39, and a semicircular clamp 34 is connected to the lower end of the screw 38. The upper end of the screw 38 is arranged on a positioning block 37 close to the bevel gear assembly 39, and a limiting groove 35 is arranged on the semicircular clamp 34 at the lower end of the screw 38, and a screw block 36 is fixed inside the semicircular clamp 34.

[0023] In this embodiment, the inner gear bearing 31 provided on the wire core clamp 10 rotates to drive the driven gear shaft 32 symmetrically provided on the inner side. At the same time, the bevel gear assembly 39 provided between the driven gear shafts 32 is driven to rotate by the driven gear shaft 32, so that the gear at the middle lower end position of the bevel gear assembly 39 rotates. When the gear rotates, the screw block 36 provided on the gear follows the inner gear bearing 31 to drive the semicircular clamp 34 to rise or fall in different rotation directions of the wire core clamp 10, and the semicircular clamp 34 is limited to rise by the positioning block 37 provided on the screw rod 38, and is limited to fall by the limiting groove 35 provided in the middle of the semicircular clamp 34, and the wire core body 15 is stably clamped.

[0024] Testing method of low-voltage multi-core cable insulation rapid detection device: First, cut off the power supply to the cable, use two core clamps 10 to clamp any two core bodies 15 of the cable at one end of the cable, and start the ultrasonic transducer unit 6 through the button of the current detection body 1 to perform ultrasonic testing on the cable insulation layer. At the same time, during the test, the end of the cable cannot be loaded, and there cannot be branches in the middle. In order to reduce errors, a cable of the same type with a known length can be used for test and calibration before the test. A single single-core cable cannot be tested. A single cable with more than two core bodies 15 insulated from each other can be tested, or more than two single-core wires twisted together can also be tested.

[0025] The basic principles and main features of the present invention and the advantages of the present invention are shown and described above. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention; therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is limited by the attached claims rather than the above description. Therefore, it is intended to include all changes within the meaning and scope of the equivalent elements of the claims in the present invention, and any figure marks in the claims should not be regarded as limiting the claims involved.

[0026] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A low-voltage multi-core cable insulation rapid detection device, comprising a current detection body (1) and a cable body (12), characterized in that: A CPU chip (18) is arranged inside the current detection body (1), and the CPU chip (18) is connected to an ultrasonic transducer unit (6) via a wiring harness. A probe interface (7) is also arranged on one side of the current detection body (1), and a probe terminal (8) is installed on the probe interface (7). The probe terminal (8) is connected to a probe line (9), and a core clamp (10) is arranged on the probe line (9), and the core clamp (10) is also connected to the ultrasonic transducer unit (6) via the probe interface (7). The cable body (12) comprises a core layer (13) arranged on the inside and an insulating layer (14) arranged on the outside of the core layer (13), and the cable body (12) is connected to the ultrasonic transducer unit (6) via the core clamp (10).

2. A low-voltage multi-core cable insulation rapid detection device according to claim 1, characterized in that: The ultrasonic transducer unit (6) comprises a receiver (16) and a transmitter (17), and the ultrasonic transducer unit (6) uses a high-performance probe to transmit ultrasonic pulses of a specific frequency to the cable body (12).

3. A low-voltage multi-core cable insulation rapid detection device according to claim 2, characterized in that: The transmitter (17) transmits ultrasonic waves through the ultrasonic transducer unit (6) and receives echo signals through the receiver (16), and analyzes parameters such as time delay, amplitude and phase of the echo signals to determine the state of the cable insulation layer (14).

4. A low-voltage multi-core cable insulation rapid detection device according to claim 1, characterized in that: An operation panel (2) is also provided at the upper end of the current detection body (1); the CPU chip (18) is arranged inside the operation panel (2); the CPU chip (18) is also connected to a control unit (19), a display unit (20), a power supply unit (21), a register (22), a wireless transmission unit (23) and a cloud server (24); the control unit (19) is connected to a control button (3) and an adjustment knob (5) on the current detection body (1); the display unit (20) is connected to a display (4); the power supply unit (21) is connected to a power interface (11); the register (22) and the wireless transmission unit (23) are both arranged inside the current detection body (1); and the wireless transmission unit (23) is wirelessly connected to the cloud server (24).

5. A low-voltage multi-core cable insulation rapid detection device according to claim 4, characterized in that: The register (22) and the wireless transmission unit (23) are in communication, and the register (22) and the wireless transmission unit (23) are also connected to a cloud server (24).

6. A low-voltage multi-core cable insulation rapid detection device according to claim 5, characterized in that: The power supply unit (21) is connected to an electric energy metering chip (25); the power supply unit (21) is a lithium battery pack; a power supply protection circuit (26) is connected in series between the power supply unit (21) and the electric energy metering chip (25); and a power supply switch (27) is connected in series between the power supply protection circuit (26) and the power supply unit (21).

7. A low-voltage multi-core cable insulation rapid detection device according to claim 5, characterized in that: The power supply protection circuit (26) is also connected to the register (22); an interface circuit (29) is also connected in series between the register (22) and the CPU chip (18); the wireless transmission unit (23) is arranged on the interface circuit (29); and an edge detection circuit (28) for circuit detection is also connected in series between the power supply protection circuit (26) and the interface circuit (29).

8. A low-voltage multi-core cable insulation rapid detection device according to claim 1, characterized in that: The wire core clamp (10) comprises a wire core access end (30) arranged at the inner front end, an internal gear bearing (31) arranged in the middle, and a wire core connection end (33) arranged at the inner rear end and connected to the probe wire (9), and the wire core body (15) passes through the wire core access end (30) and is connected to the wire core connection end (33).

9. A low-voltage multi-core cable insulation rapid detection device according to claim 8, characterized in that: The inner side of the internal gear bearing (31) is connected to two symmetrically arranged driven gear shafts (32) in the wire core clamp (10), a bevel gear assembly (39) is arranged between the two driven gear shafts (32), a screw rod (38) is arranged at the lower end of the bevel gear assembly (39), and a semicircular clamping plate (34) is connected to the lower end of the screw rod (38).

10. A low-voltage multi-core cable insulation rapid detection device according to claim 9, characterized in that: The upper end of the screw rod (38) is arranged on a positioning block (37) close to the bevel gear assembly (39), the lower end of the screw rod (38) is provided with a limiting groove (35) on the semicircular clamping plate (34), and a screw block (36) is fixedly arranged inside the semicircular clamping plate (34).

Images