Oblique incidence ultrasonic online cleaning device for metal pipeline of nuclear power station

Abstract

The invention discloses an oblique incidence ultrasonic online cleaning device for a metal pipeline of a nuclear power station. The oblique incidence ultrasonic online cleaning device comprises an ultrasonic vibrator module, an acoustic wedge block and a pipeline clamp. The ultrasonic vibrator module is used for exciting longitudinal waves of ultrasonic frequency through longitudinal vibration; the acoustic wedge block is used for regulating and controlling longitudinal waves emitted by the ultrasonic vibrator module and transmitting the longitudinal waves to the to-be-cleaned metal pipeline; and the pipeline clamp is used for fixing the acoustic wedge block on the metal pipeline to be cleaned. During working, the acoustic wedge block enables ultrasonic waves to penetrate through the pipe wall at the optimal incidence angle and stimulate mode conversion, and sediments in the pipeline are cleaned. The method is high in cleaning efficiency, can realize lossless cleaning and online cleaning, has the advantages of convenience in operation, safety, reliability, less secondary waste and the like, and is particularly suitable for being applied to high-requirement environments such as nuclear power stations and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of nuclear facility cleaning, and particularly to an on-line ultrasonic cleaning device for inclined incidence on metal pipelines of nuclear power plants, which is applicable to in-situ cleaning operations of radioactive contaminated pipelines such as primary loop pipelines of pressurized water reactors and heat transfer tubes of steam generators. Background Art

[0002] In the fields of nuclear power generation and nuclear facility operation, pipelines, as the core components for transporting key fluids such as coolant, fuel, and radioactive waste, their internal cleanliness is closely related to operation efficiency and safety. The accumulation of sediments, corrosion products, and radioactive pollutants inside nuclear pipelines will not only reduce the fluid transmission efficiency, increase energy consumption, but also may cause corrosion to pipeline materials, affect the structural integrity, and even trigger radioactive leakage incidents, posing a serious threat to the environment and personnel safety. Therefore, regular cleaning and maintenance of nuclear pipelines are key links to ensure the safe and efficient operation of nuclear facilities.

[0003] Traditional nuclear pipeline cleaning methods mainly include chemical cleaning, high-pressure water jet cleaning, and mechanical scraping, etc. Chemical cleaning removes sediments and pollutants by injecting cleaning agents into the pipeline and using chemical reactions. However, chemical cleaning agents often have corrosiveness, which may cause secondary damage to pipeline materials, and the waste liquid generated during the cleaning process is difficult to handle, easily leading to environmental pollution problems. High-pressure water jet cleaning uses high-pressure water flow to wash the inner wall of the pipeline to remove sediments. But this method has high requirements for pipeline materials and structures, is not applicable to all types of nuclear pipelines, and the water mist and splashes generated during the cleaning process may carry radioactive substances, increasing the difficulty of radiation protection. Mechanical scraping removes the sediments on the inner wall of the pipeline by physical means, but this method has complex operations, is easy to damage the inner wall of the pipeline, and has low cleaning efficiency.

[0004] In recent years, ultrasonic cleaning technology has been widely used in the field of industrial cleaning. It uses physical effects such as cavitation effect, acceleration effect, and rectilinear flow effect generated by ultrasonic waves in liquids to effectively remove dirt on the surface of workpieces and in tiny gaps inside. Ultrasonic cleaning has the advantages of high cleaning efficiency, no pollution, and being applicable to workpieces with complex shapes, so it has broad application prospects in the field of nuclear pipeline cleaning. However, applying ultrasonic cleaning technology to nuclear pipeline cleaning still faces many challenges: The decontamination ability of existing ultrasonic cleaning devices is limited: Nuclear pipelines usually have thick pipe walls and are mostly made of high-strength steel. Ultrasonic waves will attenuate during the process of penetrating the pipe wall, resulting in reduced cleaning efficiency. Traditional ultrasonic cleaning technology mostly adopts the perpendicular incidence method, that is, ultrasonic waves are emitted perpendicular to the inner wall of the pipeline. In this way, the penetration ability of ultrasonic waves is limited, and it is difficult to effectively clean the deep dirt inside the pipeline.

[0005] Poor adaptability of cleaning device: There is a wide variety of pipelines in nuclear facilities, with different pipe diameters, wall thicknesses, and materials. Traditional ultrasonic cleaning devices often struggle to meet the cleaning requirements of different pipelines. Additionally, nuclear pipelines are usually arranged in confined spaces, making the installation and disassembly of cleaning devices difficult, which increases the difficulty and cost of cleaning operations.

[0006] Mechanical vibration impact: The mechanical vibration generated during ultrasonic cleaning may cause damage to the pipeline and surrounding structures. Especially in nuclear facilities, where pipelines are closely connected to surrounding equipment, vibration transmission may lead to equipment loosening, damage, or affect the operational stability.

[0007] Difficulty in on-line cleaning: Nuclear facilities usually require continuous operation, and shutdown for cleaning will seriously affect production efficiency and economic benefits. Therefore, developing an ultrasonic cleaning device that can perform on-line, non-destructive, and efficient cleaning is of great significance for ensuring the safe and efficient operation of nuclear facilities.

[0008] In response to the above problems, scholars and engineers at home and abroad have conducted a large number of studies and practices, and proposed various improvement schemes. For example, by optimizing the design of ultrasonic generators and transducers, the emission power and frequency of ultrasonic waves are increased to enhance their penetration ability; flexible cleaning heads and adaptive clamping mechanisms are adopted to improve the adaptability of the cleaning device to different pipelines; shock-absorbing materials and structures are introduced to reduce the impact of mechanical vibration on pipelines and surrounding structures; on-line cleaning technologies and devices are developed to achieve continuous cleaning and maintenance of nuclear pipelines. However, these schemes still have many deficiencies, such as low cleaning efficiency, poor adaptability, ineffective shock absorption, and great difficulty in on-line cleaning, making it difficult to meet the actual needs of nuclear pipeline cleaning.

[0009] Therefore, developing a new type of on-line ultrasonic cleaning device for nuclear pipelines, breaking through the limitations of traditional ultrasonic cleaning technology, and achieving efficient, non-destructive, and on-line cleaning operations is of great significance for ensuring the safe and efficient operation of nuclear facilities, reducing cleaning costs, and improving economic benefits. Based on this background, the present invention proposes an innovative on-line ultrasonic cleaning device for nuclear pipelines. By adopting key technologies such as oblique-incidence ultrasonic cleaning technology, acoustic wave regulation module, and adaptive clamping system, it realizes efficient, non-destructive, and on-line cleaning of nuclear pipelines, providing new ideas and solutions for the development of nuclear facility pipeline maintenance technology. Summary of the Invention

[0010] The technical problem to be solved by the present invention is to address the deficiencies in the background technology and provide an on-line oblique-incidence ultrasonic cleaning device for metal pipelines in nuclear power plants. Through the innovative oblique-incidence ultrasonic cleaning technology, combined with acoustic wedges and pipeline clamps, it realizes rapid installation on nuclear pipelines and conducts efficient, non-destructive, and on-line cleaning of nuclear pipelines, providing strong technical support for the continuous and safe operation of nuclear facilities.

[0011] The present invention adopts the following technical solutions to solve the above technical problems: An on-line ultrasonic cleaning device for metal pipelines in a nuclear power plant with oblique incidence, comprising an ultrasonic oscillator module, a wedge block, and a pipeline clamp; The ultrasonic oscillator module is used to excite longitudinal waves with ultrasonic frequency through longitudinal vibration, and includes a pre-tightening bolt, a front cover plate, a rear cover plate, and a piezoelectric component; The front cover plate is a cylinder, and a counterbore through hole for cooperating with the pre-tightening bolt is provided at the center of one end face thereof; The rear cover plate is a frustum of a cone, the diameter of the smaller end of its end face is equal to the diameter of the cross-section of the front cover plate, and a first threaded blind hole for cooperating with the pre-tightening bolt is provided at the center of the smaller end of the end face; The piezoelectric component includes 2N piezoelectric ceramic sheets; the piezoelectric ceramic sheets are in the shape of a circular ring, the outer diameter is equal to the diameter of the cross-section of the front cover plate, and they are polarized along the thickness direction; the 2N piezoelectric ceramic sheets are stacked in sequence with the same polarization direction; The pre-tightening bolt sequentially passes through the counterbore through hole on the front cover plate, the 2N piezoelectric ceramic sheets, and then is threadedly connected to the first threaded blind hole on the rear cover plate, clamping the piezoelectric component between the front cover plate and the rear cover plate; The wedge block is used to regulate the longitudinal waves emitted by the ultrasonic oscillator module and transmit them to the metal pipeline to be cleaned, and includes an inclined wall, an upper wall, a bottom wall, and a front wall, a first side wall, a rear wall, and a second side wall that are vertically connected in sequence at the head and tail; A groove for cooperating with the metal pipeline to be cleaned is provided on the bottom wall of the wedge block; The groove is a cylindrical curved surface, and the axis is perpendicular to the front wall of the wedge block; The inclined wall of the wedge block is coaxially and fixedly connected to the larger end face of the rear cover plate; The first side wall and the second side wall of the wedge block are respectively connected to the pipeline clamp; The pipeline clamp is used to fix the wedge block on the metal pipeline to be cleaned, and includes a first shoulder block, a second shoulder block, a first frame, a second frame, a first hinge, a second hinge, a first cushion block, a second cushion block, and an adjustable buckle compressor; The first shoulder block and the second shoulder block have the same structure and are symmetrically arranged on both sides of the wedge block, and are vertically and fixedly connected to the first side wall and the second side wall of the wedge block respectively; The first frame and the second frame have the same structure and are both in the shape of an L, and both include a long plate and a short plate, and one end of the long plate is vertically fixedly connected to one end of the short plate; The other end of the first frame long plate is connected to the first shoulder block through the first hinge, and the other end of the short plate is connected to one end of the adjustable buckle presser; the other end of the second frame long plate is connected to the second shoulder block through the second hinge, and the other end of the short plate is connected to the other end of the adjustable buckle presser; the axes of the rotating shafts of the first hinge and the second hinge are parallel to the circumferential direction of the groove on the bottom wall of the acoustic wedge block; The first cushion block and the second cushion block are respectively arranged on the inner walls of the first frame and the second frame and are used for cooperating with the metal pipeline to be cleaned; The adjustable buckle presser is used for connecting or releasing the short plates of the first frame and the second frame, and adjusting the distance between the short plates of the first frame and the second frame when connecting, so that the groove on the bottom wall of the acoustic wedge block, the first cushion block, the second cushion block and the metal pipeline to be cleaned are tightly attached, and further the acoustic wedge block is fixed on the metal pipeline to be cleaned.

[0012] As a further optimized scheme of an oblique-incidence ultrasonic on-line cleaning device for metal pipelines in nuclear power plants according to the present invention, the piezoelectric ceramic sheet adopts a PZT-8 piezoelectric ceramic sheet.

[0013] As a further optimized scheme of an oblique-incidence ultrasonic on-line cleaning device for metal pipelines in nuclear power plants according to the present invention, the first cushion block and the second cushion block adopt polyurethane shock-absorbing cushion blocks.

[0014] As a further optimized scheme of an oblique-incidence ultrasonic on-line cleaning device for metal pipelines in nuclear power plants according to the present invention, the inner walls at the joints of the long plates and the short plates in the first frame and the second frame are provided with chamfers.

[0015] As a further optimized scheme of an oblique-incidence ultrasonic on-line cleaning device for metal pipelines in nuclear power plants according to the present invention, the first hinge and the second hinge both adopt butterfly hinges.

[0016] As a further optimized scheme of an oblique-incidence ultrasonic on-line cleaning device for metal pipelines in nuclear power plants according to the present invention, the acoustic wedge block is made of brass.

[0017] As a further optimized scheme of an oblique-incidence ultrasonic on-line cleaning device for metal pipelines in nuclear power plants according to the present invention, a threaded post perpendicular to the inclined wall is fixedly connected to the center of the inclined wall of the acoustic wedge block; a second threaded blind hole for cooperating with the threaded post is provided at the center of the larger end of the end face of the rear cover plate; the threaded post and the second threaded blind hole fix the rear cover plate and the acoustic wedge block together.

[0018] As a further optimized scheme of an oblique-incidence ultrasonic on-line cleaning device for metal pipelines in nuclear power plants according to the present invention, the first shoulder block, the second shoulder block, the first frame and the second frame are all made of 6061-T6 aluminum alloy material.

[0019] Compared with the prior art, the present invention adopting the above technical solution has the following technical effects: High cleaning efficiency: Experiments show that the cavitation intensity of the present invention in a DN80 pipeline reaches 1.5 MPa, significantly improving the cleaning efficiency of nuclear pipelines compared with the traditional vertical incidence cleaning method. This improvement mainly benefits from the mode conversion design of the acoustic wave regulation module and the close-fitting effect of the adaptive clamping system, enabling ultrasonic waves to penetrate the pipe wall more deeply and clean the sediment more effectively.

[0020] Non-destructive cleaning: The present invention adopts a physical cleaning method, avoiding the problems of pollutants and pipeline corrosion that may be introduced by chemical cleaning. During the cleaning process, the energy of ultrasonic waves is mainly concentrated inside the pipeline and will not cause any damage to the pipeline wall itself. This feature ensures the safe operation of nuclear facilities and extends the service life of pipelines.

[0021] Online cleaning: The present invention is compactly designed, easy to install and disassemble, and can be cleaned online without shutting down the nuclear facility. This function greatly reduces the shutdown loss, improves the continuous operation ability and economic benefits of nuclear facilities. At the same time, online cleaning can also timely detect and handle sediment problems inside the pipeline, avoiding safety hazards such as pipeline blockage and corrosion caused by sediment accumulation.

[0022] Wide application range: The adaptive clamping system realizes rapid adaptation and continuous adjustment to different pipe diameters, improving the versatility and practicability of the device. Whether it is a nuclear pipeline with a small or large pipe diameter, the present invention can provide stable and efficient cleaning effects. This feature makes the application range of the present invention in nuclear facilities wider and can meet the cleaning needs of different nuclear facilities.

[0023] In summary, through the combined application of the innovative oblique incidence ultrasonic cleaning technology, acoustic wave regulation module and adaptive clamping system, the present invention realizes efficient, non-destructive and online cleaning of nuclear pipelines. The present invention not only improves the cleaning efficiency and quality, but also reduces the impact and risk of cleaning operations on the operation of nuclear facilities. In the future, with the continuous development of the nuclear power generation and nuclear facility operation fields, the present invention will have a broader application prospect and market value. Description of the Drawings

[0024] Figure 1 is a schematic diagram of the overall structure of the present invention; Figure 2 is a schematic diagram of the structure in which the acoustic wedge and the pipe fixture of the present invention cooperate with each other.

[0025] In the figure, 1 - pre-tightening bolt, 2 - front cover plate, 3 - piezoelectric ceramic sheet, 4 - rear cover plate, 5 - acoustic wedge block, 6 - pipe clamp, 7 - metal pipe to be cleaned, 8 - first shoulder block, 9 - first hinge, 10 - first frame, 11 - second frame, 12 - first spacer, 13 - second spacer, 14 - second shoulder block. Detailed implementation manner

[0026] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings: The present invention can be implemented in many different forms and should not be considered limited to the embodiments described herein. On the contrary, these embodiments are provided so that this disclosure is thorough and complete, and will fully convey the scope of the present invention to those skilled in the art. In the drawings, components are enlarged for clarity.

[0027] It should be understood that although terms such as first, second, third, etc. may be used herein to describe various elements, components, and / or parts, these elements, components, and / or parts are not limited by these terms. These terms are only used to distinguish one element, component, and / or part from another. Therefore, the first element, component, and / or part discussed below may become the second element, component, or part without departing from the teachings of the present invention.

[0028] As Figure 1 shown, the present invention discloses an on-line ultrasonic cleaning device for inclined incidence of metal pipes in nuclear power plants, including an ultrasonic oscillator module, an acoustic wedge block, and a pipe clamp; The ultrasonic oscillator module is used to excite longitudinal waves of ultrasonic frequency through longitudinal vibration, and includes a pre-tightening bolt, a front cover plate, a rear cover plate, and a piezoelectric component; The front cover plate is a cylinder, and a countersunk through hole for cooperating with the pre-tightening bolt is provided at the center of one end face; The rear cover plate is a frustum of a cone, the diameter of the smaller end of its end face is equal to the diameter of the cross-section of the front cover plate, and a first threaded blind hole for cooperating with the pre-tightening bolt is provided at the center of the smaller end of the end face; The piezoelectric component includes 2N piezoelectric ceramic sheets; the piezoelectric ceramic sheets are in the shape of a circular ring, the outer diameter is equal to the diameter of the cross-section of the front cover plate, and are polarized along the thickness direction; the 2N piezoelectric ceramic sheets are stacked in sequence, and the polarization directions are the same; The pre-tightening bolt sequentially passes through the countersunk through hole on the front cover plate, 2N piezoelectric ceramic sheets, and is threadedly connected to the first threaded blind hole on the rear cover plate, clamping the piezoelectric component between the front cover plate and the rear cover plate; As Figure 2 shown, the acoustic wedge block is used to regulate the longitudinal waves emitted by the ultrasonic oscillator module and transmit them to the metal pipe to be cleaned, and includes an inclined wall, an upper wall, a bottom wall, and a front wall, a first side wall, a rear wall, and a second side wall that are vertically connected in sequence at the head and tail; A groove for cooperating with the metal pipeline to be cleaned is provided on the bottom wall of the acoustic wedge block; The groove is a cylindrical curved surface, and the axis is perpendicular to the front wall of the acoustic wedge block; The inclined wall of the acoustic wedge block is coaxially and fixedly connected to the larger end face of the rear cover plate; The first side wall and the second side wall of the acoustic wedge block are respectively connected to the pipeline fixture; As Figure 2 shown, the pipeline fixture is used to fix the acoustic wedge block on the metal pipeline to be cleaned, and includes a first shoulder block, a second shoulder block, a first frame, a second frame, a first hinge, a second hinge, a first cushion block, a second cushion block and an adjustable buckle compressor; The first shoulder block and the second shoulder block have the same structure and are symmetrically arranged on both sides of the acoustic wedge block, and are respectively perpendicularly and fixedly connected to the first side wall and the second side wall of the acoustic wedge block; The first frame and the second frame have the same structure and are both L-shaped, and both include a long plate and a short plate, and one end of the long plate is perpendicularly connected to one end of the short plate; The other end of the long plate of the first frame is connected to the first shoulder block through the first hinge, and the other end of the short plate is connected to one end of the adjustable buckle compressor; the other end of the long plate of the second frame is connected to the second shoulder block through the second hinge, and the other end of the short plate is connected to the other end of the adjustable buckle compressor; the axes of the rotating shafts of the first hinge and the second hinge are parallel to the circumferential direction of the groove on the bottom wall of the acoustic wedge block; The first cushion block and the second cushion block are respectively arranged on the inner walls of the first frame and the second frame for cooperating with the metal pipeline to be cleaned; The adjustable buckle compressor is used to connect or release the short plates of the first frame and the second frame, and adjust the distance between the short plates of the first frame and the second frame when connecting, so that the groove on the bottom wall of the acoustic wedge block, the first cushion block, the second cushion block and the metal pipeline to be cleaned are tightly fitted, and then the acoustic wedge block is fixed on the metal pipeline to be cleaned.

[0029] The piezoelectric ceramic sheet preferably adopts a PZT-8 piezoelectric ceramic sheet; the first cushion block and the second cushion block preferably adopt polyurethane shock-absorbing cushion blocks; the first hinge and the second hinge both preferably adopt butterfly hinges; the acoustic wedge block is preferably made of brass; the first shoulder block, the second shoulder block, the first frame and the second frame are all preferably made of 6061-T6 aluminum alloy material. Chamfers are preferably provided on the inner walls at the joints of the long plates and the short plates of the first frame and the second frame.

[0030] A threaded column perpendicularly and fixedly connected to the inclined wall is provided at the center of the inclined wall of the acoustic wedge block; a second threaded blind hole for cooperating with the threaded column is provided at the center of the larger end of the end face of the rear cover plate; the threaded column and the second threaded blind hole fix the rear cover plate and the acoustic wedge block.

[0031] When setting the inclined surface inclination angle of the acoustic wedge block, its value is numerically equal to the incident angle of the sound wave. The incident angle of the sound wave affects the sound intensity transmission coefficient and the propagation distance of the ultrasonic guided wave. According to the law of sound wave refraction and reflection, as the incident angle of the sound wave increases, the sound intensity transmission coefficient increases, and the propagation distance of the ultrasonic guided wave decreases. By plotting the curves of the change in the sound intensity transmission coefficient and the change in the propagation distance of the ultrasonic guided wave at different incident angles of the sound wave, the optimal incident angle of the sound wave is determined, which is the inclined surface inclination angle of the acoustic wedge block.

[0032] Through the collaborative work of the ultrasonic oscillator module, the acoustic wedge block, and the pipe clamp, the present invention realizes the precise and efficient cleaning of the internal deposits of nuclear pipes.

[0033] The ultrasonic oscillator module is the power source of the device of the present invention. Through the PZT-8 piezoelectric ceramic sheet, the resonant frequency of the entire transducer is stabilized within the range of 25 kHz ± 1 kHz. This design not only ensures the stable output of ultrasonic waves but also greatly improves the emission efficiency of ultrasonic waves. During the cleaning process, the ultrasonic oscillator module generates strong longitudinal vibrations, which are converted into ultrasonic waves and propagate in the liquid medium, providing sufficient energy for the subsequent cleaning operation.

[0034] The acoustic wedge block adopts a sound velocity gradient matching design, and the ultrasonic wave mode conversion is realized through the acoustic wedge block made of brass. After calculating the inclined surface inclination angle of the acoustic wedge block according to the law of sound wave refraction, the longitudinal wave can penetrate the pipe wall at the optimal incident angle and excite mode conversion inside the pipe wall, that is, the longitudinal wave is converted into a transverse wave. This conversion process greatly improves the propagation efficiency and cleaning effect of ultrasonic waves inside the pipe wall.

[0035] The pipe clamp realizes the rapid installation and disassembly and adaptive adjustment of different pipe diameters through the first and second hinges and the adjustable buckle compressor. During the cleaning process, the pipe clamp can closely fit the surface of the pipe, ensuring the effective transmission of ultrasonic waves and the cleaning effect. At the same time, the pipe clamp is also equipped with polyurethane shock-absorbing pads, which effectively attenuate the mechanical vibration energy and protect the safety of the pipe and the surrounding structures. This design not only improves the versatility and practicality of the device but also reduces the impact of the cleaning operation on the operation of nuclear facilities.

[0036] When the present invention is specifically implemented, it is first fixed on the metal pipe to be cleaned through the pipe clamp. Then, the ultrasonic oscillator module generates ultrasonic waves and transmits them to the inside of the pipe through the acoustic wedge block. Under the action of the acoustic wedge block, the ultrasonic waves penetrate the pipe wall at the optimal incident angle and excite mode conversion to clean the deposits inside the pipe. During the cleaning process, the pipe clamp can closely fit the surface of the metal pipe to be cleaned and maintain a stable cleaning effect. At the same time, the polyurethane shock-absorbing pads effectively attenuate the mechanical vibration energy and protect the safety of the pipe and the surrounding structures.

[0037] The present invention not only ensures the effective transmission of ultrasonic energy, but also improves the cleaning efficiency and uniformity, supports on-line cleaning without shutdown, greatly reducing the maintenance time and cost of nuclear power plants. At the same time, due to the reduction in the use of chemical reagents, corrosion of pipelines is avoided, and the service life of pipelines is extended. In addition, by using the cavitation effect to remove dirt in slits and deep holes, pollutants in hard-to-reach areas can be effectively removed, and it is applicable to the cleaning of pipelines in operating and decommissioned nuclear power plants. The present invention has the advantages of convenient operation, safety and reliability, and less secondary waste, and is particularly suitable for applications in high-requirement environments such as nuclear power plants.

[0038] Those skilled in the art of the present technology can understand that, unless otherwise defined, all terms used herein (including technical terms and scientific terms) have the same meaning as the general understanding of those of ordinary skill in the art to which the present invention belongs. It should also be understood that terms such as those defined in a general dictionary should be understood to have a meaning consistent with the meaning in the context of the prior art, and will not be interpreted in an idealized or overly formal sense unless defined as herein.

[0039] The specific embodiments described above further elaborate on the purpose, technical solutions, and beneficial effects of the present invention. It should be understood that the above description is only the specific embodiments of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. An on-line ultrasonic cleaning device for metal pipelines in a nuclear power plant with oblique incidence, characterized in that, It includes an ultrasonic oscillator module, a sound wedge, and a pipe fixture; The ultrasonic oscillator module is used to excite longitudinal waves of ultrasonic frequency through longitudinal vibration, and includes a pre-tightening bolt, a front cover plate, a rear cover plate, and a piezoelectric component; The front cover plate is a cylinder, and a counterbore through hole for mating with the pre-tightening bolt is provided at the center of one end face thereof; The rear cover plate is a frustum of a cone, the diameter of the smaller end of its end face is equal to the diameter of the cross-section of the front cover plate, and a first threaded blind hole for mating with the pre-tightening bolt is provided at the center of the smaller end of the end face; The piezoelectric component includes 2N piezoelectric ceramic sheets; the piezoelectric ceramic sheets are in the shape of a circular ring, the outer diameter is equal to the diameter of the cross-section of the front cover plate, and are polarized along the thickness direction; the 2N piezoelectric ceramic sheets are stacked in sequence, and the polarization directions are the same; The pre-tightening bolt sequentially passes through the counterbore through hole on the front cover plate, the 2N piezoelectric ceramic sheets, and then is threadedly connected to the first threaded blind hole on the rear cover plate, clamping the piezoelectric component between the front cover plate and the rear cover plate; The sound wedge is used to regulate the longitudinal waves emitted by the ultrasonic oscillator module and transmit them to the metal pipe to be cleaned, and includes an inclined wall, an upper wall, a bottom wall, and a front wall, a first side wall, a rear wall, and a second side wall that are vertically connected in sequence at the head and tail; A groove for mating with the metal pipe to be cleaned is provided on the bottom wall of the sound wedge; The groove is a cylindrical curved surface, and the axis is perpendicular to the front wall of the sound wedge; The inclined wall of the sound wedge is coaxially fixedly connected to the larger end face of the rear cover plate; The first side wall and the second side wall of the sound wedge are respectively connected to the pipe fixture; The pipe fixture is used to fix the sound wedge on the metal pipe to be cleaned, and includes a first shoulder block, a second shoulder block, a first frame, a second frame, a first hinge, a second hinge, a first cushion block, a second cushion block, and an adjustable buckle presser; The first shoulder block and the second shoulder block have the same structure and are symmetrically arranged on both sides of the sound wedge, and are vertically fixedly connected to the first side wall and the second side wall of the sound wedge respectively; The first frame and the second frame have the same structure and are both in the shape of an L, and both include a long plate and a short plate, and one end of the long plate is vertically fixedly connected to one end of the short plate; The other end of the long plate of the first frame is connected to the first shoulder block through the first hinge, and the other end of the short plate is connected to one end of the adjustable buckle presser; the other end of the long plate of the second frame is connected to the second shoulder block through the second hinge, and the other end of the short plate is connected to the other end of the adjustable buckle presser; the axes of the rotation shafts of the first hinge and the second hinge are parallel to the circumferential direction of the groove on the bottom wall of the sound wedge; The first cushion block and the second cushion block are respectively arranged on the inner walls of the first frame and the second frame for mating with the metal pipe to be cleaned; The adjustable buckle presser is used to connect or release the short plates of the first frame and the second frame, and adjust the distance between the short plates of the first frame and the second frame when connected, so that the groove on the bottom wall of the sound wedge, the first cushion block, the second cushion block and the metal pipe to be cleaned are tightly fitted, thereby fixing the sound wedge on the metal pipe to be cleaned.

2. The on-line ultrasonic cleaning device for inclined incidence on metal pipelines of a nuclear power plant according to claim 1, wherein The piezoelectric ceramic sheet adopts a PZT-8 piezoelectric ceramic sheet.

3. The on-line ultrasonic cleaning device for the metal pipeline of a nuclear power plant with oblique incidence according to claim 1, wherein The first cushion block and the second cushion block adopt polyurethane shock-absorbing cushion blocks.

4. The on-line ultrasonic cleaning device for metal pipelines in a nuclear power plant according to claim 1, characterized in that, The inner walls at the joints of the long plates and short plates in the first frame and the second frame are provided with chamfers.

5. The on-line ultrasonic cleaning device for inclined incidence on the metal pipeline of a nuclear power plant according to claim 1, characterized in that Both the first hinge and the second hinge adopt butterfly hinges.

6. The on-line ultrasonic cleaning device for inclined incidence on metal pipelines of nuclear power plants according to claim 1, wherein The sound wedge block is made of brass.

7. The on-line ultrasonic cleaning device for the inclined incidence of metal pipelines in a nuclear power plant according to claim 1, characterized in that, A threaded post perpendicular to the inclined wall is fixedly connected to the center of the inclined wall of the sound wedge block; a second threaded blind hole for cooperating with the threaded post is provided at the center of the larger end of the end face of the rear cover plate; the threaded post and the second threaded blind hole fix the rear cover plate and the sound wedge block together.

8. The on-line ultrasonic cleaning device for inclined incidence on metal pipelines of a nuclear power plant according to claim 1, wherein The first shoulder block, the second shoulder block, the first frame, and the second frame are all made of 6061-T6 aluminum alloy material.

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