A multi-parameter cable non-destructive testing device

Abstract

The utility model relates to cable nondestructive testing technical field, concretely to a kind of multi-parameter cable nondestructive testing device, including cable to be measured, tetrahedron tilt block and two transducers, the side of tilt block towards cable to be measured is set with the complete matching of cable outer surface curvature Adhesion groove, two The transducer is assembled on the same tilt block side by side, both are commonly arranged on the same side of cable to be measured axis, two The transducer can alternately switch transmission, receiving operating mode, realize ultrasonic signal same side one transmission one receiving detection, by setting with the one-to-one matching of cable outer diameter Adhesion groove in tilt block, match same side side-by-side arrangement, the ultrasonic signal of two transducers of alternately transmitting and receiving, can closely adhere to the outer skin of big curvature cable, reduce the gap loss in ultrasonic propagation process, improve received signal signal-to-noise ratio.

Description

Technical Field

[0001] This utility model relates to the field of cable non-destructive testing technology, specifically a multi-parameter cable non-destructive testing device. Background Technology

[0002] Cables are important carriers of power and signal transmission in power systems, communication networks, and industrial production. The quality of the outer plastic sheath of the cable directly determines the overall electrical performance and service life of the cable. During the production and long-term use of the cable, defects such as scratches, cracks, and bubbles are prone to appear on the sheath, which not only affect the appearance but also cause problems such as leakage and insulation breakdown, and in severe cases, can lead to safety accidents.

[0003] Currently, cable sheath defect detection methods mainly include manual inspection, machine vision inspection, eddy current inspection, laser inspection, and traditional ultrasonic inspection. Manual inspection is inefficient, prone to missed or incorrect detections, and cannot achieve full-range coverage. Machine vision inspection can only identify visible surface defects and cannot detect subcutaneous pores or hidden cracks. It is also easily affected by surface oil and dust. Eddy current inspection is only suitable for cables with metal surfaces and cannot detect non-metallic sheaths. Laser inspection has blind spots and is difficult to achieve full coverage. Traditional ultrasonic inspection is affected by the large curvature of the cable surface, resulting in poor probe coupling, low signal-to-noise ratio, and bulky equipment that is inconvenient to carry. It can only perform single-parameter inspection and cannot meet the needs of portable, multi-parameter continuous monitoring in the field. Therefore, we propose a multi-parameter cable non-destructive testing device. Utility Model Content

[0004] To address the aforementioned technical problems, this application provides a multi-parameter cable non-destructive testing device, comprising a cable under test, a tetrahedral inclined block, and two transducers. The inclined block has a fitting groove on the side facing the cable under test that perfectly matches the curvature of the cable's outer surface. The two transducers are mounted side-by-side on the same inclined block, both arranged on the same side of the cable's axis. The two transducers can alternately switch between transmission and reception modes to achieve simultaneous transmission and reception of ultrasonic signals on the same side.

[0005] In some embodiments, the inclined block is made of 304 stainless steel, and the inclined surface of the inclined block is provided to adapt to the ultrasonic incident angle, and the curvature of the groove is matched one-to-one with the outer diameter of the cable to be tested.

[0006] In some embodiments, one of the two transducers emits an ultrasonic signal and the other receives an ultrasonic signal, with the ultrasonic waves propagating laterally along the cable sheath to complete defect detection.

[0007] In some embodiments, the cable under test is provided with an aluminum core, a cross-linked polyethylene sheath, an aluminum sheath, and a PVC cable outer sheath from the inside out.

[0008] In some embodiments, a piezoelectric element is also included, which is assembled at the connection position between the inclined block and the transducer to assist in the excitation and transmission of ultrasonic excitation signals.

[0009] In some embodiments, the inclined block includes an upper block and a lower block, wherein the upper block is slidably mounted on the lower block via a dovetail block.

[0010] In some embodiments, a wedge-shaped rod is slidably installed vertically at the port of the lower block. The wedge-shaped rod can limit the position of the dovetail block after it enters the lower block. A disc spring is provided between the wedge-shaped rod and the lower block, and the two ends of the disc spring are fixedly connected to the wedge-shaped rod and the lower block, respectively.

[0011] This utility model has at least the following beneficial effects: 1. By setting a fitting groove in the inclined block that matches the outer diameter of the cable in a one-to-one ratio, and pairing it with two transducers arranged side by side on the same side that can alternately transmit and receive ultrasonic signals, it can closely fit the outer sheath of the cable with large curvature, reduce gap loss during ultrasonic propagation, improve the signal-to-noise ratio of the received signal, and at the same time, the sound wave can propagate laterally along the cable sheath to complete the simultaneous detection of multiple parameters such as subcutaneous bubbles, cracks, and sheath thickness. There is no need to set the detection structure on both sides of the cable, the overall structure has a higher degree of integration, and a single person can complete the detection by hand. It is suitable for field conditions with no back operation space, such as bundled cables and narrow cable trays. Non-destructive testing can be carried out without power outages or stripping the cable sheath, reducing on-site operation procedures and safety hazards.

[0012] 2. By alternately transmitting and receiving ultrasonic signals through two sets of transducers, the sound waves are transmitted laterally along the cable sheath layer, enabling simultaneous identification of multiple parameters such as air bubbles, cracks, and sheath thickness on the cable surface. One device can complete multiple inspection tasks without the need to change multiple sets of equipment for separate inspections, effectively shortening cable maintenance time and reducing labor input. The entire inspection system adopts ultrasonic non-destructive testing, which does not require power outages or stripping of the cable's outer protective structure during operation, thus preventing damage to the cable and avoiding line faults caused by the inspection operation. At the same time, the perfect matching layer set at the cable boundary reduces excess reflected noise, making defect-related signals easier to distinguish, and the inspection results are stable and accurate. The device has a small number of overall components, making processing and assembly easier and production costs controllable. It can be used for batch inspection of finished products on cable production lines and can also be taken to outdoor sites for live-line inspection of cables in operation, making it applicable to a wider range of scenarios. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a front view of the entire utility model; Figure 3This is a schematic diagram showing the structural separation of the inclined block and the cable body of this utility model; Figure 4 This is a schematic diagram showing the structural separation of the upper and lower blocks of this utility model; Figure 5 This utility model Figure 4 - Enlarged structural diagram at point A.

[0014] In the diagram: 1. Inclined block; 11. Upper block; 12. Lower block; 13. Dovetail block; 14. Wedge rod; 15. Disc spring; 2. Cable sheath; 3. Aluminum cladding; 4. Cross-linked polyethylene cladding; 5. Aluminum core; 6. Piezoelectric element; 7. Transducer. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] Example 1: Please refer to Figure 1-5 This utility model provides a technical solution: a multi-parameter cable non-destructive testing device, including a cable under test, a tetrahedral inclined block 1, and two transducers 7. The inclined block 1 has a fitting groove on the side facing the cable under test that perfectly matches the curvature of the cable's outer surface. The two transducers 7 are mounted side-by-side on the same inclined block 1, both arranged on the same side of the cable's axis. The two transducers 7 can alternately switch between transmission and reception modes, enabling simultaneous transmission and reception of ultrasonic signals on the same side. The cable under test is sequentially configured from the inside out with an aluminum core 5, a cross-linked polyethylene sheath 4, an aluminum sheath 3, and a P... The VC material cable sheath 2 has a tetrahedral inclined block 1 with an arc-shaped fitting groove placed on one side of the outer wall of the cable under test. The groove completely fits the outer surface of the cable to eliminate air gaps and ensure the ultrasonic transmission coupling effect. The two sets of transducers 7 installed on the same side can freely switch working states. Either side can be used as the transmitting end to output ultrasonic waves, and the other side can be used as the receiving end to collect sound wave signals. The multi-layer sheath structure of the cable provides a medium channel for the transverse transmission of ultrasonic waves. The completely transmitted sound waves carry information related to internal defects of the sheath and sheath thickness, thereby completing non-destructive testing without the need to place the testing components on both sides of the cable.

[0017] The inclined block 1 is made of 304 stainless steel. The inclined surface of the inclined block 1 is set to adapt to the ultrasonic incident angle. The curvature of the groove is matched one-to-one with the outer diameter of the cable under test. The 304 stainless steel material has stable acoustic conduction performance and high structural hardness. It is not easily deformed or worn by repeated friction with the cable over a long period of time. The angle of the inclined surface of the block is designed to match the ultrasonic incident requirements, ensuring that the ultrasonic waves can enter the PVC sheath of the cable at the optimal angle. The groove replicates the arc surface of the cable outer diameter one-to-one. Regardless of the standard outer diameter of the cable, the block can be seamlessly attached to the surface of the cable, avoiding ultrasonic attenuation and signal loss caused by the gaps in the curved surface, and continuously maintaining stable coupling detection conditions.

[0018] Two transducers 7, one of which transmits ultrasonic signals and the other receives ultrasonic signals. The ultrasonic waves propagate laterally along the cable sheath 2 to complete defect detection. The transmitting transducer 7 outputs ultrasonic waves, which are conducted through the inclined block 1 into the PVC sheath of the cable and propagate laterally along the sheath to the position of the other transducer 7. If the sound waves pass through defect areas such as bubbles and cracks during the transmission process, the waveform amplitude and phase will change regularly. The receiving transducer 7 completely collects the changed sound wave signals. By analyzing the signal changes, the defect type, defect location, and actual thickness of the sheath 2 of the cable sheath can be determined simultaneously. Multiple parameter data can be obtained in a single test.

[0019] Example 2: Please refer to Figure 3 , Figure 4 and Figure 5 It also includes a piezoelectric element 6, which is assembled at the connection position between the inclined block 1 and the transducer 7. It is used to assist in the excitation and transmission of ultrasonic excitation signals. The piezoelectric element 6 is arranged in the middle of the transducer 7 and the inclined block 1. After being energized, the piezoelectric element 6 uses the piezoelectric effect to complete the mutual conversion between electrical signals and ultrasonic waves. On the one hand, it assists the transducer 7 in stabilizing the excitation of the standard ultrasonic excitation waveform and improving the sound wave emission intensity. On the other hand, it converts the sound wave vibration transmitted back by the cable into an electrical signal and transmits it to the transducer 7, reducing the energy loss of the sound wave at the connection between the block and the transducer 7, making the received signal waveform more complete and clear, and reducing noise interference.

[0020] The inclined block 1 includes an upper block 11 and a lower block 12. The upper block 11 is slidably mounted on the lower block 12 via a dovetail block 13. A wedge-shaped rod 14 is slidably mounted vertically at the end of the lower block 12. The wedge-shaped rod 14 can limit the position of the dovetail block 13 after it enters the lower block 12. A disc spring 15 is provided between the wedge-shaped rod 14 and the lower block 12. The two ends of the disc spring 15 are fixedly connected to the wedge-shaped rod 14 and the lower block 12, respectively. The upper block 11 and the lower block 12 are quickly connected and assembled by sliding cooperation of the dovetail block 13. The cable to be tested is clamped between the upper block 11 and the lower block 12. After the dovetail block 13 slides into the lower block 12, the disc spring 15 continuously applies a downward elastic force to the wedge rod 14, causing the wedge rod 14 to press down against the dovetail block 13 to complete the limiting and locking. The two blocks can be quickly assembled by simply sliding and elastically tightening, without the need for additional bolts or clips. During the testing process, the wedge rod 14 continuously restricts the lateral sliding of the dovetail block 13 to prevent the upper block 11 from shifting due to external force, which could cause the transducer 7 to fail to adhere to the cable surface. When disassembling, simply pull the wedge rod 14 down to release the limiting force, and the dovetail block 13 can be directly pulled out to separate the two blocks. The disassembly and assembly operation is simple and quick.

[0021] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0022] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A multi-parameter cable non-destructive testing device, comprising the cable under test, a tetrahedral inclined block (1), and two transducers (7), characterized in that: The inclined block (1) has a groove on the side facing the cable to be tested that perfectly matches the curvature of the cable's outer surface. The two transducers (7) are mounted side by side on the same inclined block (1) and are arranged on the same side of the cable's axis. The two transducers (7) can alternately switch between transmitting and receiving modes to achieve simultaneous transmission and reception of ultrasonic signals on the same side.

2. The multi-parameter cable non-destructive testing device according to claim 1, characterized in that: The inclined block (1) is made of 304 stainless steel. The inclined surface of the inclined block (1) is set to adapt to the ultrasonic incident angle, and the curvature of the groove is matched one-to-one with the outer diameter of the cable to be tested.

3. The multi-parameter cable non-destructive testing device according to claim 1, characterized in that: One of the two transducers (7) emits an ultrasonic signal and the other receives an ultrasonic signal. The ultrasonic waves propagate laterally along the cable sheath (2) to complete the defect detection.

4. The multi-parameter cable non-destructive testing device according to claim 1, characterized in that: The cable under test is provided with an aluminum core (5), a cross-linked polyethylene sheath (4), an aluminum sheath (3), and a PVC cable outer sheath (2) from the inside out.

5. The multi-parameter cable non-destructive testing device according to claim 1, characterized in that: It also includes a piezoelectric element (6), which is assembled at the connection position between the inclined block (1) and the transducer (7) to assist in the excitation and transmission of ultrasonic excitation signals.

6. The multi-parameter cable non-destructive testing device according to claim 1, characterized in that: The inclined block (1) includes an upper block (11) and a lower block (12), wherein the upper block (11) is slidably mounted on the lower block (12) by a dovetail block (13).

7. The multi-parameter cable non-destructive testing device according to claim 6, characterized in that: A wedge rod (14) is slidably installed vertically at the port of the lower block (12). The wedge rod (14) can limit the position of the dovetail block (13) after it enters the lower block (12). A disc spring (15) is provided between the wedge rod (14) and the lower block (12). The two ends of the disc spring (15) are fixedly connected to the wedge rod (14) and the lower block (12) respectively.

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