A high-temperature ultrasonic non-destructive testing device, transducer and system

Abstract

This invention provides a high-temperature ultrasonic non-destructive testing device, transducer, and system. The high-temperature ultrasonic non-destructive testing device includes: a first pressure stage, a second pressure stage, a first tungsten screw, a second tungsten screw, a spring washer, a nut, an insulating ceramic gasket, a transducer, a first copper foil, and a second copper foil. The first and second pressure stages are arranged vertically opposite each other. The first and second tungsten screws pass through the first pressure stage and are fixed to the second pressure stage. Nuts are provided on the exposed portions of the first and second tungsten screws on the upper surface of the first pressure stage. The spring washer is disposed between the nut and the upper surface of the first pressure stage. The insulating ceramic gasket, the first copper foil, the transducer, the second copper foil, and the object to be tested are arranged sequentially from top to bottom and disposed between the first and second pressure stages. The thermal expansion coefficient of the transducer is greater than that of the first and second tungsten screws. This device simplifies the structure of the non-destructive testing device and improves the testing efficiency.

Description

Technical Field

[0001] This invention belongs to the field of nondestructive testing technology, specifically relating to a high-temperature ultrasonic nondestructive testing device, transducer, and system. Background Technology

[0002] Ultrasonic nondestructive testing (NDT) is a commonly used NDT method with advantages such as low cost, real-time performance, deep penetration, and wide applicability. In high-temperature NDT, the NDT equipment has a significant impact on testing efficiency.

[0003] Conventional testing devices are large and complex in structure. Some devices achieve sound transmission between the transducer and the test object through air coupling, but this results in the loss of most of the sound energy emitted by the transducer and introduces noise generated by various reflecting surfaces, placing extremely high demands on the transducer's emission performance. Some devices use a coupling agent between the transducer and the test object, but the coupling agent has a short service life and evaporates quickly at high temperatures, making long-term testing impossible. Some devices fill the testing environment with liquid and immerse the transducer in it for testing, but the temperature resistance of the liquid limits the operating temperature of the device, and the introduction of liquid increases the structural complexity of the device, making testing more difficult. Moreover, this testing method is not suitable for most application scenarios. Another type of device achieves close contact between the transducer and the test object by applying external pressure, thereby improving sound transmission efficiency. However, this requires the introduction of an additional constant pressure device, and the pressure needs to be constantly adjusted during the test to compensate for poor contact caused by uneven thermal expansion of various components of the testing device. This results in a complex structure and difficult operation. Summary of the Invention

[0004] To address the aforementioned problems in the prior art, the present invention provides a high-temperature ultrasonic non-destructive testing device, transducer, and system.

[0005] The technical problem to be solved by this invention is achieved through the following technical solution:

[0006] In a first aspect, the present invention provides a high-temperature ultrasonic nondestructive testing device, which has a bilaterally symmetrical structure and includes:

[0007] First pressure platform, second pressure platform, first tungsten screw, second tungsten screw, spring washer, nut, insulating ceramic gasket, transducer, first copper foil and second copper foil;

[0008] The first and second pressure platforms are arranged opposite each other, and the first and second tungsten screws pass through the first pressure platform and are fixed on the second pressure platform; nuts are provided on the exposed portions of the first and second tungsten screws on the upper surface of the first pressure platform; spring washers are provided between the nuts and the upper surface of the first pressure platform.

[0009] The insulating ceramic gasket, the first copper foil, the transducer, the second copper foil, and the object to be tested are arranged in order from top to bottom and placed between the first pressure platform and the second pressure platform;

[0010] The thermal expansion coefficient of the transducer is greater than that of the first tungsten screw and the second tungsten screw.

[0011] Optionally, the first and second pressing platforms are made of stainless steel plates with a thickness of 1cm, a length of 12cm, and a width of 4cm.

[0012] Optionally, the first tungsten screw and the second tungsten screw are 12cm in length and 8mm in diameter.

[0013] Optionally, the spring washer is a 301 stainless steel washer with an inner diameter of 10mm and an outer diameter of 16mm.

[0014] Optionally, the ceramic gasket is an alumina ceramic disc with a diameter of 1 cm and a thickness of 2 mm.

[0015] Optionally, the areas of the first copper foil and the second copper foil are larger than the area of ​​the upper surface of the transducer; the thickness of the first copper foil and the second copper foil is 20 μm.

[0016] In a second aspect, the present invention provides a transducer as described in the first aspect above, wherein the transducer is disposed between a first copper foil and a second copper foil.

[0017] The transducer is used to convert pulse signals into ultrasonic signals and reflected sound signals into measured echo signals.

[0018] Thirdly, the present invention provides a high-temperature ultrasonic non-destructive testing system, comprising: a pulse transmitter and receiver, an oscilloscope, and a high-temperature ultrasonic non-destructive testing device as described in the first aspect above.

[0019] A pulse transmitter and receiver, used to generate pulse signals and receive measurement echo signals from a high-temperature ultrasonic non-destructive testing device;

[0020] A high-temperature ultrasonic non-destructive testing device is used to receive pulse signals and convert them into ultrasonic signals;

[0021] The high-temperature ultrasonic non-destructive testing device is also used to receive the reflected sound signal of the object under test in response to the ultrasonic signal, and convert the reflected sound signal into a measurement echo signal;

[0022] An oscilloscope is used to display waveform information of pulse signals and measure echo signals.

[0023] Optionally, the high-temperature ultrasonic nondestructive testing system may also include: analytical equipment;

[0024] The analysis equipment communicates with the oscilloscope and is used to provide non-destructive testing analysis results based on the waveform information from the oscilloscope.

[0025] This invention provides a high-temperature ultrasonic non-destructive testing device, transducer, and system. The high-temperature ultrasonic non-destructive testing device includes: a first pressure stage, a second pressure stage, a first tungsten screw, a second tungsten screw, a spring washer, a nut, an insulating ceramic gasket, a transducer, a first copper foil, and a second copper foil. The first and second pressure stages are arranged vertically opposite each other. The first and second tungsten screws pass through the first pressure stage and are fixed to the second pressure stage. Nuts are provided on the exposed portions of the first and second tungsten screws on the upper surface of the first pressure stage. The spring washer is disposed between the nut and the upper surface of the first pressure stage. The insulating ceramic gasket, the first copper foil, the transducer, the second copper foil, and the object to be tested are arranged sequentially from top to bottom and disposed between the first and second pressure stages. The thermal expansion coefficient of the transducer is greater than that of the first and second tungsten screws. In this invention, a pressurized dry coupling method using copper foil as the coupling medium is used, which improves the acoustic transmission efficiency. In addition, since the thermal expansion coefficient of the transducer is greater than that of the first tungsten screw and the second tungsten screw, the high-temperature ultrasonic non-destructive testing device can stably reach the coupling pressure throughout the entire temperature range without needing to adjust the pressure as the temperature changes, which simplifies the device structure and improves the testing efficiency.

[0026] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of a high-temperature ultrasonic non-destructive testing device provided in an embodiment of the present invention;

[0028] Figure 2 The image shows the test results of nondestructive testing provided in this embodiment of the invention.

[0029] Figure 3 This is a schematic diagram of a high-temperature ultrasonic non-destructive testing system provided in an embodiment of the present invention. Detailed Implementation

[0030] The present invention will be further described in detail below with reference to specific embodiments, but the implementation of the present invention is not limited thereto.

[0031] To simplify the structure of nondestructive testing devices and improve their efficiency, this invention provides a high-temperature ultrasonic nondestructive testing device. Figure 1 This is a schematic diagram of the structure of a high-temperature ultrasonic nondestructive testing device provided in an embodiment of the present invention, as shown below. Figure 1As shown, it includes: a first pressure platform 9, a second pressure platform 10, a first tungsten screw 11, a second tungsten screw 12, a spring washer 13, a nut 14, an insulating ceramic gasket 15, a transducer 16, a first copper foil 17, and a second copper foil 18.

[0032] The first pressure platform 9 and the second pressure platform 10 are arranged opposite each other. The first tungsten screw 11 and the second tungsten screw 12 pass through the first pressure platform 9 and are fixed on the second pressure platform 10. Nuts 14 are provided on the exposed parts of the first tungsten screw 11 and the second tungsten screw 12 on the upper surface of the first pressure platform 9. Spring washers 13 are provided between the nuts 14 and the upper surface of the first pressure platform 9.

[0033] The insulating ceramic pad 15, the first copper foil 17, the transducer 16, the second copper foil 18, and the object to be tested 19 are arranged from top to bottom and placed between the first pressure platform 9 and the second pressure platform 10.

[0034] The thermal expansion coefficient of transducer 16 is greater than that of the first tungsten screw 11 and the second tungsten screw 12.

[0035] It should be noted that, in this embodiment of the invention, in order to achieve a thermal expansion coefficient of transducer 16 that is greater than that of the first tungsten screw 11 and the second tungsten screw 12, the outer shell material of transducer 16 can be set to copper (copper has a thermal expansion coefficient of 17.7 × 10⁻⁶). -6 / ℃), because the thermal expansion coefficient of the tungsten screw is 5×10 -6 The pressure is around ℃, thus meeting the expansion coefficient requirements. This setting allows the device to stably reach the coupling pressure across the entire temperature range without needing to adjust the pressure as the temperature changes, simplifying the device structure and making the non-destructive testing process easier to implement.

[0036] This invention provides a high-temperature ultrasonic non-destructive testing device, comprising: a first pressure stage 9, a second pressure stage 10, a first tungsten screw 11, a second tungsten screw 12, a spring washer 13, a nut 14, an insulating ceramic gasket 15, a transducer 16, a first copper foil 17, and a second copper foil 18; the first pressure stage 9 and the second pressure stage 10 are arranged vertically opposite each other, the first tungsten screw 11 and the second tungsten screw 12 pass through the first pressure stage 9 and are fixed on the second pressure stage 10; nuts 14 are provided on the exposed portions of the first tungsten screw 11 and the second tungsten screw 12 on the upper surface of the first pressure stage 9; the spring washer 13 is disposed between the nut 14 and the upper surface of the first pressure stage 9; the insulating ceramic gasket 15, the first copper foil 17, the transducer 16, the second copper foil 18, and the object to be tested are arranged sequentially from top to bottom and disposed between the first pressure stage 9 and the second pressure stage 10; wherein, the thermal expansion coefficient of the transducer 16 is greater than the thermal expansion coefficient of the first tungsten screw 11 and the second tungsten screw 12. In this embodiment of the invention, a pressurized dry coupling method using copper foil as the coupling medium is used, which improves the acoustic transmission efficiency. In addition, since the thermal expansion coefficient of the transducer 16 is greater than that of the first tungsten screw 11 and the second tungsten screw 12, the high-temperature ultrasonic non-destructive testing device can stably reach the pressure required for coupling throughout the entire temperature range without needing to adjust the pressure as the temperature changes, which simplifies the device structure and improves the testing efficiency.

[0037] Optionally, the first pressing platform 9 and the second pressing platform 10 are made of stainless steel plates with a thickness of 1cm, a length of 12cm, and a width of 4cm.

[0038] Optionally, the first tungsten screw 11 and the second tungsten screw 12 are 12cm long and 8mm in diameter.

[0039] It should be noted that, in the embodiments of the present invention, due to the low coefficient of thermal expansion of tungsten, the preload remains stable in different temperature ranges.

[0040] Optionally, the spring washer 13 is a 301 stainless steel washer with an inner diameter of 10mm and an outer diameter of 16mm.

[0041] In this embodiment, the overall thickness of the spring washer 13 before pressure is applied can be 6 mm, and the thickness after pressure is applied can be 2.5 mm, and its elasticity can provide a stronger preload.

[0042] In this embodiment of the invention, a preload can be applied by tightening the nut 14.

[0043] Optionally, the ceramic gasket is an alumina ceramic disc with a diameter of 1 cm and a thickness of 2 mm.

[0044] In this embodiment of the invention, the ceramic gasket is located on the upper surface of the copper foil and the transducer 16, and serves as an insulator to isolate the electrodes on the upper surface of the transducer 16 from the high-temperature ultrasonic non-destructive testing device.

[0045] Optionally, the area of ​​the first copper foil 17 and the second copper foil 18 is larger than the area of ​​the upper surface of the transducer 16; the thickness of the first copper foil 17 and the second copper foil 18 is 20 μm.

[0046] It should be noted that, due to its soft texture, copper can act as an acoustic coupling medium and buffer layer, allowing the surface of transducer 16 to make better contact with the object under test after the pre-tightening force is applied. This reduces contact gaps, facilitates the transmission of sound waves to the object under test, reduces energy loss, and improves detection efficiency. Furthermore, copper has good electrical conductivity, which allows the electrodes on the surface of transducer 16 to be connected to the entire high-temperature ultrasonic non-destructive testing device, facilitating the extraction of electrodes in transducer 16.

[0047] To verify the high-temperature ultrasonic non-destructive testing device provided in this embodiment of the invention, the detection performance of the device was also verified using a defective steel plate. Specifically, the test steel block was 30 mm thick, the defect was a 4 mm diameter hole-shaped defect, and the upper surface depth was 18 mm. Figure 2 The image shown is a graph illustrating the test results of nondestructive testing provided in an embodiment of the present invention. From... Figure 2 It can be seen that, using the high-temperature ultrasonic non-destructive testing device provided by the present invention, the defect echo signal and the signal reflected from the bottom surface of the steel block (bottom surface echo) are very stable at different temperatures during the temperature change process from 25℃ to 250℃. The depth of the defect can be calculated by the time of the defect echo signal and the sound velocity of the steel block at the corresponding temperature. The calculation results are shown in Table 1. It can be seen from Table 1 that the maximum error does not exceed 0.7%.

[0048] Table 1 Test Results

[0049]

[0050] This invention also provides a transducer 16, which is disposed between a first copper foil 17 and a second copper foil 18;

[0051] Transducer 16 is used to convert pulse signals into ultrasonic signals and reflected sound signals into measurement echo signals.

[0052] This invention also provides a high-temperature ultrasonic non-destructive testing system. Figure 3 This is a schematic diagram of the structure of a high-temperature ultrasonic nondestructive testing system provided in an embodiment of the present invention, as shown below. Figure 3 As shown, it includes: a pulse transmitter and receiver, an oscilloscope, and a high-temperature ultrasonic non-destructive testing device;

[0053] A pulse transmitter and receiver, used to generate pulse signals and receive measurement echo signals from a high-temperature ultrasonic non-destructive testing device;

[0054] A high-temperature ultrasonic non-destructive testing device is used to receive pulse signals and convert them into ultrasonic signals;

[0055] The high-temperature ultrasonic non-destructive testing device is also used to receive the reflected sound signal of the object under test in response to the ultrasonic signal, and convert the reflected sound signal into a measurement echo signal;

[0056] An oscilloscope is used to display waveform information of pulse signals and measure echo signals.

[0057] Optionally, the high-temperature ultrasonic nondestructive testing system may also include: analytical equipment;

[0058] The analysis equipment communicates with the oscilloscope and is used to provide non-destructive testing analysis results based on the waveform information from the oscilloscope.

[0059] It should be noted that the high-temperature ultrasonic non-destructive testing system provided in this embodiment of the invention can also be applied to scenarios such as thickness measurement and pipeline inspection.

[0060] It should be noted that the terms "first," "second," etc., are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this disclosure described herein can be implemented in orders other than those illustrated or described herein. The implementations described in the following exemplary embodiments do not represent all implementations consistent with this disclosure. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this disclosure.

[0061] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0062] Although this application has been described herein in conjunction with various embodiments, those skilled in the art, by reviewing the accompanying drawings and the disclosure, will understand and implement other variations of the disclosed embodiments in carrying out the claimed application. In the description of this invention, the word "comprising" does not exclude other components or steps, "a" or "an" does not exclude a plurality, and "a plurality" means two or more, unless otherwise explicitly specified. Furthermore, while different embodiments may describe certain measures, this does not mean that these measures cannot be combined to produce good results.

[0063] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the scope of protection of the present invention.

Claims

1. A high-temperature ultrasonic non-destructive testing device, characterized in that, The high-temperature ultrasonic non-destructive testing device has a symmetrical structure and includes: First pressure platform, second pressure platform, first tungsten screw, second tungsten screw, spring washer, nut, insulating ceramic gasket, transducer, first copper foil and second copper foil; The first pressure platform and the second pressure platform are arranged opposite each other, the first tungsten screw and the second tungsten screw pass through the first pressure platform and are fixed on the second pressure platform; the exposed portions of the first tungsten screw and the second tungsten screw on the upper surface of the first pressure platform are provided with nuts; the spring washer is disposed between the nut and the upper surface of the first pressure platform; The insulating ceramic gasket, the first copper foil, the transducer, the second copper foil, and the object to be tested are arranged in order from top to bottom and are placed between the first pressure platform and the second pressure platform; The thermal expansion coefficient of the transducer is greater than that of the first tungsten screw and the second tungsten screw.

2. The high-temperature ultrasonic non-destructive testing device according to claim 1, characterized in that, The first and second pressing platforms are made of stainless steel plates; the thickness is 1cm, the length is 12cm, and the width is 4cm.

3. The high-temperature ultrasonic non-destructive testing device according to claim 1, characterized in that, The first tungsten screw and the second tungsten screw are 12cm long and 8mm in diameter.

4. The high-temperature ultrasonic non-destructive testing device according to claim 1, characterized in that, The spring washer is a 301 stainless steel washer with an inner diameter of 10mm and an outer diameter of 16mm.

5. The high-temperature ultrasonic non-destructive testing device according to claim 1, characterized in that, The ceramic gasket is an alumina ceramic disc with a diameter of 1 cm and a thickness of 2 mm.

6. The high-temperature ultrasonic non-destructive testing device according to claim 1, characterized in that, The areas of the first copper foil and the second copper foil are larger than the area of ​​the upper surface of the transducer; the thickness of the first copper foil and the second copper foil is 20 μm.

7. A transducer as described in any one of claims 1-6, characterized in that, The transducer is disposed between the first copper foil and the second copper foil; The transducer is used to convert pulse signals into ultrasonic signals and reflected sound signals into measurement echo signals.

8. A high-temperature ultrasonic non-destructive testing system, characterized in that, include: A pulse transmitter and receiver, an oscilloscope, and a high-temperature ultrasonic non-destructive testing device as described in any one of claims 1-6; The pulse transmitter and receiver is used to generate pulse signals and receive measurement echo signals from the high-temperature ultrasonic non-destructive testing device; The high-temperature ultrasonic non-destructive testing device is used to receive the pulse signal and convert the pulse signal into an ultrasonic signal; The high-temperature ultrasonic non-destructive testing device is also used to receive the reflected sound signal of the object under test in response to the ultrasonic signal, and convert the reflected sound signal into a measurement echo signal; The oscilloscope is used to display the waveform information of the pulse signal and the measured echo signal.

9. The high-temperature ultrasonic nondestructive testing system according to claim 8, characterized in that, The high-temperature ultrasonic non-destructive testing system also includes: analytical equipment; The analysis device is communicatively connected to the oscilloscope and is used to provide non-destructive testing analysis results based on the waveform information of the oscilloscope.

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