An ultrasonic detection device for insulating rods used in live working

Abstract

An ultrasonic detection device for insulating rods for live working relates to an ultrasonic detection device. At present, for the water immersion ultrasonic detection of insulating rods, the required water immersion device is large and only suitable for laboratory detection, and is not suitable for making a portable device. The present invention includes a detection head and a detection instrument connected to the detection head, the detection head includes a wedge block, a transmitting probe and a receiving probe arranged on the wedge block; a sound insulation layer is arranged on the wedge block between the transmitting probe and the receiving probe; the bottom surface of the wedge block is provided with an inner concave arc surface matching the insulating rod, and the top surface of the wedge block is provided with a transmitting probe and a receiving probe; the transmitting probe and the receiving probe face the inner concave arc surface, and there is an angle between the transmitting probe and the receiving probe; the transmitting probe and the receiving probe are connected to the ultrasonic detector through a probe line. The technical solution has a simple structure, is light, easy to carry, and easy to operate, and can conveniently and effectively realize the internal wound detection of the insulating rod.

Description

Technical Field

[0001] The invention relates to an ultrasonic detection device, in particular to an ultrasonic detection device for an insulating rod for live working. Background Art

[0002] Insulating pipes for live working are generally made of glass fiber reinforced epoxy resin composite materials, which have good mechanical and insulating properties. Since insulating tools are subjected to the combined effects of high voltage and mechanical stress during long-term use, microscopic defects such as stratification, air gaps, and impurities are easily formed inside, resulting in a decrease in their mechanical and insulating properties, which ultimately endangers the safety of operators and maintenance equipment. At present, the commonly used preventive tests judge the overall performance of insulating pipes by conducting tests such as withstand voltage detection, leakage current detection, and dynamic load detection, but no quantitative analysis can be given on the internal defects of the material. At the same time, regular tests can only guarantee the current state of the tool, and cannot guarantee the performance during use. As a non-destructive testing method, ultrasonic testing technology has significant advantages such as convenient operation, simple equipment, and no damage. However, the diameter of the insulating rod is small, the typical diameter is 20mm, the curvature is large, and ultrasonic coupling is difficult. Moreover, it is a composite material, and the ultrasonic wave attenuates greatly inside it and propagates complexly. Although the water immersion method can achieve ultrasonic coupling, the required water immersion device for water immersion ultrasonic testing of insulating rods is large, which is only suitable for laboratory testing, not suitable for portable devices, and ultrasonic testing of insulating rods cannot be performed on site. Summary of the invention

[0003] The technical problem to be solved and the technical task proposed by the present invention are to improve and perfect the existing technical solutions and provide an ultrasonic detection device for live working insulating rods, so as to facilitate the detection of internal injuries of live working insulating rods. To this end, the present invention adopts the following technical solutions.

[0004] An ultrasonic detection device for insulating rods for live working comprises a detection head and a detection instrument connected to the detection head, wherein the detection head comprises a wedge, a transmitting probe and a receiving probe arranged on the wedge; a sound insulation layer is arranged on the wedge between the transmitting probe and the receiving probe; the bottom surface of the wedge is provided with an inner concave arc surface matching the insulating rod, and the top surface of the wedge is provided with a transmitting probe and a receiving probe; the transmitting probe and the receiving probe face the inner concave arc surface, and an angle is formed between the transmitting probe and the receiving probe; the transmitting probe and the receiving probe are connected to the ultrasonic detection instrument through a probe line, and the ultrasonic detection instrument has a function of separating transmission and reception, realizing one transmission and one reception of the transmitting probe and the receiving probe, and the ultrasonic detection instrument uses a high-voltage pulse to excite the transmitting probe, and amplifies and collects the ultrasonic echo received by the receiving probe, and judges the internal defects of the insulating rod according to the ultrasonic echo. During ultrasonic testing, the insulating rod is placed in the concave arc surface of the wedge block, the high-voltage power supply is turned on, the transmitting probe is excited by a high-voltage pulse, and the ultrasonic echo received by the receiving probe is amplified and collected. The internal defects of the insulating rod are judged based on the ultrasonic echo. The structure is simple, light, easy to carry, easy to operate, and can conveniently and effectively realize the internal defect detection of the insulating rod.

[0005] As a further improvement and supplement to the above technical solution, the present invention also includes the following additional technical features.

[0006] The top surface of the wedge block is provided with two symmetrical inclined surfaces, one of which is provided with the transmitting probe, and the other is provided with the receiving probe. An axially penetrating sound insulation groove is provided in the middle position of the inner concave arc surface, and a sound insulation layer is embedded in the sound insulation groove. The sound insulation groove is convenient for embedding the sound insulation layer. Through the sound insulation layer, the ultrasonic wave emitted by the transmitting probe will not be directly transmitted to the receiving probe, and invalid ultrasonic clutter is filtered out, making the ultrasonic detection clearer.

[0007] The inclined surface is provided with screw holes, the front ends of the transmitting probe and the receiving probe are provided with threads, and the transmitting probe and the receiving probe are threadedly connected with the corresponding screw holes. The threaded connection mode facilitates the disassembly and replacement of the transmitting probe and the receiving probe.

[0008] The detection head is provided with a plurality of wedges, and the plurality of wedges form a wedge block group with concave arc surfaces of different curvature radii, and one is selected according to the diameter of the insulating rod to be detected during detection. By using a plurality of wedge blocks with concave arc surfaces of different curvatures, corresponding selection can be conveniently performed according to different insulating rod diameters, making the internal wound detection of the insulating rod faster and more accurate.

[0009] The axes of the screw holes on the two inclined surfaces intersect within the curvature radius of the inner concave arc surface, which facilitates the emitting and receiving directions of the emitting probe and the receiving probe to be aligned with the inside of the insulating rod, making the ultrasonic detection results clearer and more accurate.

[0010] The intersection point of the center lines of the transmitting probe and the receiving probe coincides with the center of the inner concave arc surface. This makes it easy for the transmitting and receiving directions of the transmitting probe and the receiving probe to be aligned with the center of the insulating rod, and enables the ultrasonic wave to have a better reflection effect inside the insulating rod, so as to receive the ultrasonic wave to the greatest extent and make the ultrasonic detection clearer.

[0011] The heads of the transmitting probe and the receiving probe are both piezoelectric chips; the piezoelectric chips are provided with multiple frequencies; during detection, piezoelectric chips corresponding to different frequencies and diameters are selected according to the type of insulating rod. The piezoelectric chips generate high ultrasonic intensity and high pressure resistance; by selecting the corresponding piezoelectric chips for different insulating rods, effective ultrasonic detection can be achieved better.

[0012] The frequencies of the piezoelectric chips include 5 MHz and 10 MHz. The two piezoelectric chips are widely used and have good use effects.

[0013] The transmitting probe uses a piezoelectric chip with a high d33 coefficient to generate a large ultrasonic intensity; the receiving probe uses a piezoelectric chip with a high g33 coefficient to have high sensitivity and high bandwidth. The piezoelectric chip with a high d33 coefficient generates a large ultrasonic intensity, has a high receiving sensitivity, and has a relatively large receiving sound wave bandwidth, which can more effectively realize internal trauma detection.

[0014] The angle between the transmitting probe and the receiving probe is α, 42°≤α≤62°. The ultrasonic wave has a better reflection effect in the insulating rod within this angle range, so that the receiving probe can receive the ultrasonic wave to the maximum extent.

[0015] The detector includes a T / R transceiver switch, a preamplifier, a time gain controller, a filter, an analog-to-digital converter, a controller, a high-voltage transmitter and a high-voltage analog switch. The controller is connected to the time gain controller, the high-voltage transmitter, the analog-to-digital converter and the display; the controller is connected to the transmitting probe through the high-voltage transmitter; the T / R transceiver switch, the preamplifier, the time gain controller, the filter and the analog-to-digital converter are arranged in series, and the information of the receiving probe is sequentially transmitted through the T / R transceiver switch, the preamplifier, the time gain controller, the filter, the analog-to-digital converter and the access controller. When the dual probes are transmitting and receiving, the high-voltage analog switch is turned off, the transmission and reception are separated, the high-voltage transmitter generates a high-voltage pulse to excite the transmitting probe, and the receiving circuit amplifies and filters the signal of the receiving probe through the T / R transceiver switch, preamplifier, time gain controller, and filter, and then collects and converts it into a digital signal through the analog-to-digital converter, and then processes and displays the waveform; since the insulating rod is a composite material, the ultrasonic attenuation in the composite material is large, so the ultrasonic emission intensity needs to be increased. Also due to the large ultrasonic attenuation of the composite material, the ultrasonic echo is weak, so a pre-low noise amplification is required, and time gain control is required to achieve high-sensitivity ultrasonic reception, so as to find defects in the insulating rod.

[0016] Beneficial effects:

[0017] 1. The structure is simple, light, and easy to carry, and it can conveniently and effectively realize the internal damage detection of the insulating rod.

[0018] 2. By replacing different wedges and the transmitting probes and receiving probes on the wedges, insulating rods of different diameters and material specifications can be effectively tested.

[0019] 3. By setting a sound insulation groove on the wedge between the transmitting probe and the receiving probe, the invalid ultrasonic clutter can be effectively reduced, making the ultrasonic detection clearer.

[0020] 4. By optimizing the transmitting and receiving angles of the transmitting and receiving probes, the ultrasonic wave has a better reflection effect inside the insulating rod, so that the ultrasonic wave can be received to the greatest extent and the ultrasonic detection is clearer.

[0021] 5. Through the priority piezoelectric chip, the ultrasonic intensity generated is large, the pressure resistance is high, and the receiving sensitivity is high. The received sound wave bandwidth is relatively large, which can more effectively realize internal trauma detection.

[0022] 6. Through perfect circuit control, the ultrasonic emission intensity can be effectively enhanced and high-sensitivity ultrasonic reception can be achieved, making it easier to find defects in the insulating rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the working principle structure of the detection head of the present invention.

[0024] Figure 2 It is a working principle diagram of the detector of the present invention.

[0025] In the figure: 1-wedge; 2-receiving probe; 3-transmitting probe; 4-sound insulation layer; 5-high-voltage analog switch; 6-T / R transceiver switch; 7-preamplifier; 8-time gain controller; 9-filter; 10-analog-to-digital converter; 11-high-voltage transmitter; 12-display; 13-controller; 14-insulating rod. DETAILED DESCRIPTION

[0026] The technical solution of the present invention is further described in detail below in conjunction with the accompanying drawings.

[0027] like Figure 1-2As shown, an ultrasonic detection device for insulating rods for live working includes a detection head and a detection instrument connected to the detection head, wherein the detection head includes a wedge block 1, a transmitting probe 3 and a receiving probe 2 arranged on the wedge block 1; a sound insulation layer 4 is arranged on the wedge block 1 between the transmitting probe 3 and the receiving probe 2; the bottom surface of the wedge block 1 is provided with an inner concave arc surface matching the insulating rod, and the top surface of the wedge block 1 is provided with a transmitting probe 3 and a receiving probe 2; the transmitting probe 3 and the receiving probe 2 face the inner concave arc surface, and there is an angle between the transmitting probe 3 and the receiving probe 2; the transmitting probe 3 and the receiving probe 2 are connected to the ultrasonic detector through a probe line, and the ultrasonic detector has a function of separating transmission and reception, realizing one transmission and one reception of the transmitting probe 3 and the receiving probe 2, and the ultrasonic detector uses a high-voltage pulse to excite the transmitting probe 3, and amplifies and collects the ultrasonic echo received by the receiving probe 2, and judges the internal defect of the insulating rod 14 according to the ultrasonic echo.

[0028] In order to isolate invalid ultrasonic clutter, the top surface of the wedge block 1 is provided with two symmetrical inclined surfaces, one of which is provided with a transmitting probe 3, and the other is provided with a receiving probe 2. An axially penetrating sound insulation groove is provided in the middle of the concave arc surface, and a sound insulation layer 4 is embedded in the sound insulation groove. Through the sound insulation layer, the ultrasonic wave emitted by the transmitting probe 3 will not be directly transmitted to the receiving probe 2, thereby isolating invalid ultrasonic clutter and making ultrasonic detection clearer.

[0029] In order to facilitate disassembly and replacement, screw holes are provided on the inclined surface, and threads are provided at the front ends of the transmitting probe 3 and the receiving probe 2, and the transmitting probe 3 and the receiving probe 2 are threadedly connected with the corresponding screw holes. Through the threaded connection mode, it is convenient to disassemble and replace the transmitting probe 3 and the receiving probe 2.

[0030] In order to adapt to the different diameters of the insulating rods 14, the detection head is provided with a plurality of wedges 1, and the plurality of wedges 1 form a group of wedges 1 with concave arc surfaces of different curvature radii, and one is selected according to the diameter of the insulating rod 14 to be detected during the detection. Through the wedges 1 with concave arc surfaces of a plurality of different curvatures, it is convenient to select correspondingly according to the different diameters of the insulating rod 14, so that the internal wound detection of the insulating rod 14 is faster and more accurate.

[0031] In order to obtain better detection results, the axes of the screw holes on the two inclined surfaces intersect within the curvature radius of the concave arc surface, so that the transmitting and receiving directions of the transmitting probe 3 and the receiving probe 2 are aligned with the inside of the insulating rod 14, making the ultrasonic detection results clearer and more accurate.

[0032] In order to obtain better detection results, the intersection point of the center lines of the transmitting probe 3 and the receiving probe 2 coincides with the center of the inner concave arc surface. This facilitates the emitting and receiving directions of the transmitting probe 3 and the receiving probe 2 to be aligned with the center of the insulating rod 14, and enables the ultrasonic wave to have a better reflection effect inside the insulating rod 14, so as to receive the ultrasonic wave to the greatest extent and make the ultrasonic detection clearer.

[0033] In order to better realize ultrasonic detection, the heads of the transmitting probe 3 and the receiving probe 2 are both piezoelectric chips; during detection, piezoelectric chips with corresponding frequencies and diameters are selected according to the type of the insulating rod 14. The use of piezoelectric chips generates high ultrasonic intensity and high voltage resistance. By selecting corresponding piezoelectric chips for different insulating rods 14, effective ultrasonic detection can be better realized.

[0034] In order to better realize ultrasonic detection, the transmitting probe 3 uses a piezoelectric chip with a high d33 coefficient to generate a large ultrasonic intensity; the receiving probe 2 uses a piezoelectric chip with a high g33 coefficient to have high sensitivity and high bandwidth. The piezoelectric chip with a high d33 coefficient generates a large ultrasonic intensity, has a high receiving sensitivity, and has a relatively large received sound wave bandwidth, which can more effectively realize internal trauma detection.

[0035] In order to obtain a better ultrasonic reflection effect, the angle between the transmitting probe 3 and the receiving probe 2 is 45 degrees. At this angle, the ultrasonic wave has a better reflection effect in the insulating rod 14, so that the receiving probe 2 can better receive the ultrasonic wave.

[0036] In order to achieve perfect ultrasonic emission, reception and processing, the detector includes a T / R transceiver switch 6, a preamplifier 7, a time gain controller 8, a filter 9, an analog-to-digital converter 10, a controller 13, a high-voltage transmitter 11 and a high-voltage analog switch 5. The controller 13 is connected to the time gain controller 8, the high-voltage transmitter 11, the analog-to-digital converter 10 and the display; the controller 13 is connected to the transmitting probe 3 through the high-voltage transmitter 11; the T / R transceiver switch 6, the preamplifier 7, the time gain controller 8, the filter 9, and the analog-to-digital converter 10 are arranged in series, and the information of the receiving probe 2 is sequentially transmitted through the T / R transceiver switch 6, the preamplifier 7, the time gain controller 8, the filter 9, the analog-to-digital converter 10, and the access controller 13. When the dual probes transmit and receive, the high-voltage analog switch 5 is turned off, the transmission and reception are separated, the high-voltage transmitter 11 generates a high-voltage pulse to excite the transmitting probe 3, and the receiving circuit amplifies and filters the signal of the receiving probe 2 through the T / R transceiver switch 6, the preamplifier 7, the time gain controller 8, and the filter 9, and then collects and converts it into a digital signal through the analog-to-digital converter 10, and then processes and displays the waveform; since the insulating rod 14 is a composite material, the ultrasonic attenuation in the composite material is large, and the ultrasonic emission intensity needs to be increased. Similarly, due to the large ultrasonic attenuation of the composite material, the ultrasonic echo is weak, so a pre-low noise amplification is required, and time gain control is required to achieve high-sensitivity ultrasonic reception, so as to find defects in the insulating rod 14.

[0037] During ultrasonic testing, firstly, a coupling agent is applied to the detection arc surface of the insulating rod 14, and then the insulating rod 14 is placed in the concave arc surface of the wedge block 1, and the high-voltage power supply is turned on. The dual probes transmit and receive one at a time, the high-voltage analog switch 5 is turned off, and the transmission and reception are separated. The high-voltage transmitter 11 generates a high-voltage pulse to excite the transmitting probe 3, and the receiving circuit amplifies and filters the signal of the receiving probe 2 through the T / R transceiver switch 6, the preamplifier 7, the time gain controller 8, and the filter 9, and then collects and converts it into a digital signal through the analog-to-digital converter 10, and then processes and displays the waveform on the display 12. The operator judges the internal defect of the insulating rod 14 according to the displayed ultrasonic echo signal. The structure is simple, light, easy to carry, and easy to operate, and can conveniently and effectively realize the internal defect detection of the insulating rod 14.

[0038] In this example, the frequency of the piezoelectric chip is 10 MHz.

[0039] above Figure 1-2 The ultrasonic detection device for insulating rods for live working shown is a specific embodiment of the present invention, which has embodied the essential characteristics and progress of the present invention. According to actual use needs and under the guidance of the present invention, equivalent modifications in shape, structure, etc. can be made to it, which are all within the protection scope of this scheme.

Claims

1. An ultrasonic detection device for insulating rods used in live working, comprising a detection head and a detector connected to the detection head, characterized in that: The detection head comprises a wedge block, a transmitting probe and a receiving probe arranged on the wedge block; a sound insulation layer is arranged on the wedge block between the transmitting probe and the receiving probe; the bottom surface of the wedge block is provided with an inner concave arc surface matching the insulating rod, and the top surface of the wedge block is provided with a transmitting probe and a receiving probe; the transmitting probe and the receiving probe face the inner concave arc surface, and there is an angle between the transmitting probe and the receiving probe; the transmitting probe and the receiving probe are connected to the ultrasonic detector through a probe line, and the ultrasonic detector has a function of separating transmission and reception, realizing the transmission and reception of the transmitting probe and the receiving probe, and the ultrasonic detector uses a high-voltage pulse to excite the transmitting probe, and amplifies and collects the ultrasonic echo received by the receiving probe, and judges the internal defects of the insulating rod according to the ultrasonic echo; The top surface of the wedge block is provided with two symmetrical inclined surfaces, one of which is provided with the transmitting probe, and the other is provided with the receiving probe. An axially penetrating sound insulation groove is provided in the middle of the concave arc surface, and a sound insulation layer is embedded in the sound insulation groove. The intersection point of the center lines of the transmitting probe and the receiving probe coincides with the center of the concave arc surface; The angle between the transmitting probe and the receiving probe is α, 42°≤α≤62°.

2. The ultrasonic detection device for insulating rods for live working according to claim 1, characterized in that: The inclined surface is provided with screw holes, the front ends of the transmitting probe and the receiving probe are provided with threads, and the transmitting probe and the receiving probe are threadedly connected with the corresponding screw holes.

3. The ultrasonic detection device for live working insulating rods according to claim 2, characterized in that: The detection head is provided with a plurality of wedges, which form a wedge block group with concave arc surfaces of different curvature radii, and one is selected according to the diameter of the insulating rod to be detected during detection.

4. The ultrasonic detection device for insulating rods for live working according to claim 3, characterized in that: The axes of the screw holes on the two inclined surfaces intersect within the curvature radius of the inner concave arc surface.

5. The ultrasonic detection device for insulating rods used in live working according to claim 1, characterized in that: The heads of the transmitting probe and the receiving probe are both piezoelectric chips; the piezoelectric chips are provided with piezoelectric chips of various frequencies; during detection, piezoelectric chips corresponding to different frequencies and different diameters are selected according to the type of the insulating rod.

6. The ultrasonic detection device for insulating rods used in live working according to claim 5, characterized in that: The frequencies of the piezoelectric chip include 5MHz and 10MHz; the transmitting probe adopts a piezoelectric chip with a high d33 coefficient to generate a large ultrasonic intensity; the receiving probe adopts a piezoelectric chip with a high g33 coefficient to have high sensitivity and high bandwidth.

7. An ultrasonic detection device for insulating rods used in live working according to any one of claims 1 to 6, characterized in that: The detector includes a T / R transceiver switch, a preamplifier, a time gain controller, a filter, an analog-to-digital converter, a controller, a high-voltage transmitter and a high-voltage analog switch. The controller is connected to the time gain controller, the high-voltage transmitter, the analog-to-digital converter and the display; the controller is connected to the transmitting probe through the high-voltage transmitter; the T / R transceiver switch, the preamplifier, the time gain controller, the filter and the analog-to-digital converter are arranged in series, and the information of the receiving probe is sequentially transmitted through the T / R transceiver switch, the preamplifier, the time gain controller, the filter, the analog-to-digital converter and the access controller.

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