Acoustic emission detection device for industrial storage tanks

Abstract

This disclosure relates to an acoustic emission detection device for industrial storage tanks, comprising a signal acquisition unit, a protection unit, and a noise reduction unit. The signal acquisition unit includes a waveguide rod and an acoustic emission sensor at its top, with a positioning flange at the bottom of the waveguide rod. The protection unit includes a housing and a wave-blocking base. The housing covers the outside of the signal acquisition unit and is positioned and connected to the side wall of the storage tank via the wave-blocking base. The noise reduction unit includes an end cap and a cable exit assembly located at its center. Through this technical solution, the signal acquisition unit and the protection unit are separately configured, and the housing is connected to the storage tank via the wave-blocking base, preventing Lamb waves from being transmitted to the acoustic emission sensor and causing signal interference. This, combined with the noise reduction unit, effectively improves the signal-to-noise ratio. Simultaneously, the end cap seals the internal space of the housing, blocking contact between the signal acquisition unit and the outside environment, effectively preventing dust or rainwater from entering the housing, ensuring a stable operating environment for the signal acquisition unit, and improving the overall service life and detection accuracy of the device.

Description

Technical Field

[0001] This disclosure relates to the field of chemical equipment technology, and more specifically, to an acoustic emission detection device for industrial storage tanks. Background Technology

[0002] Industrial storage tanks are primarily used as storage devices in chemical, oil, or natural gas industries. To monitor for leaks in storage tanks in real time, acoustic emission technology is typically used for dynamic non-destructive testing, which can monitor active defects in the tank's bottom or wall plates online.

[0003] In related technologies, to comprehensively cover the monitoring area, acoustic emission sensors are often horizontally installed on the side wall of the storage tank. However, existing acoustic emission detection devices, when installed horizontally, cannot employ waterproofing measures or only use simple capping structures. Rainwater can easily flow back into the device along the horizontally extending cables, or accumulate on the windward side and seep into the casing, causing short circuits and damage to the sensor. Furthermore, the installation on the tank side wall is affected by gravity, easily resulting in a cantilever beam effect, uneven pressure distribution at the coupling surface, and poor stability. Simultaneously, the outer shell of existing devices typically forms a rigid contact with the tank wall without acoustic isolation. The tank wall acts as a waveguide, transmitting both acoustic emission signals generated by leaks at defects and background noise Lamb waves generated by fluid flow or mechanical vibration. These can be directly transmitted to the sensor through the outer shell, causing mode aliasing, leading to a reduced signal-to-noise ratio and severe interference. Summary of the Invention

[0004] The purpose of this disclosure is to provide an acoustic emission detection device for industrial storage tanks, so as to at least partially solve the problems existing in the above-mentioned related technologies.

[0005] To achieve the above objectives, this disclosure provides an acoustic emission detection device for an industrial storage tank, comprising: a signal acquisition unit including a waveguide rod extending horizontally and an acoustic emission sensor disposed on the top of the waveguide rod, wherein the bottom of the waveguide rod is provided with a positioning flange for positioning the bottom of the waveguide rod to the side wall of the storage tank; a protection unit including a housing and a wave-blocking base, wherein the housing covers the outside of the signal acquisition unit, and the wave-blocking base is disposed at one end of the housing near the side wall of the storage tank, and the wave-blocking base is configured to be positioned to the side wall of the storage tank; and a noise reduction unit including an end cap and a cable exit assembly, wherein the end cap is fastened to the end of the housing away from the storage tank and is selectively connected to the housing, and the cable exit assembly is disposed at the center of the end cap.

[0006] Optionally, the end cap includes: a snap fastener disposed on the edge of the end cap and protruding toward the storage tank, the snap fastener having a flange on its inner circumferential wall for engaging with the outer wall of the housing to connect the end cap to the housing; and a limiting portion disposed at uniform intervals along the radial direction of the end cap on the inner side of the end cap to divide the inner side of the end cap into a plurality of annular receiving cavities.

[0007] Optionally, the noise reduction unit further includes a rotor cover disposed between the end cover and the waveguide rod for pressing the acoustic emission sensor toward the waveguide rod. The rotor cover has a plurality of extensions on the side away from the waveguide rod, and the plurality of extensions are configured to be evenly spaced along the radial direction of the rotor cover. Each extension extends at least partially into the receiving cavity and is respectively disposed opposite to one of the receiving cavities. The extensions and the end cover are configured not to contact each other.

[0008] Optionally, the cable outlet assembly includes: a connector disposed at the center of the end cap; a gasket affixed to the surface of the acoustic emission sensor; and an elastic element disposed between the gasket and the rotor cap for providing preload along the axial direction of the waveguide rod, wherein the acoustic emission sensor is provided with a cable configured to pass through the gasket, the elastic element, the rotor cap and the connector in sequence through the end cap.

[0009] Optionally, the walls of the limiting portion and the extension portion are respectively provided with a damping coating, and the material of the damping coating is set as microporous polyurethane or modified damping slurry.

[0010] Optionally, the axial cross-sectional profile of the waveguide rod is set to an exponential curve shape and configured to gradually decrease from the bottom to the top of the waveguide rod.

[0011] Optionally, the positioning flange is provided with an acoustic wave collecting surface on the side facing the storage tank. The acoustic wave collecting surface is configured to protrude from the bottom of the positioning flange toward the storage tank, and the protrusion distance of the acoustic wave collecting surface is set to 0.1mm to 0.2mm.

[0012] Optionally, an annealed soft metal foil is provided between the acoustic wave acquisition surface and the side wall of the storage tank, configured to undergo plastic deformation when the positioning flange is positioned and connected to the storage tank to fill the coupling gap between the acoustic wave acquisition surface and the side wall of the storage tank.

[0013] Optionally, the shell and the end cap are made of plastic material, and the inner wall of the shell and the inner side of the end cap are respectively provided with conductive shielding layers. The conductive shielding layers are configured to be connected to the side wall of the storage tank through the wave-damping base and grounded.

[0014] Optionally, the wave-damping base includes: a conductive layer made of a magnetic conductive material for magnetically connecting and electrically communicating with the side wall of the storage tank; a damping layer disposed on the side of the conductive layer away from the storage tank; and a mass ring disposed on the side of the damping layer away from the conductive layer and connected to the shell.

[0015] Through the above technical solution, the signal acquisition unit and protection unit of this device are set up separately, with an air suspension gap between them. The shell and the storage tank are connected by a wave-damping base to prevent Lamb waves from being conducted to the acoustic emission sensor and causing signal interference. This can be combined with a noise reduction unit to effectively improve the signal-to-noise ratio. At the same time, an end cap is provided at the end of the shell to seal the internal space of the shell, blocking the signal acquisition unit from contact with the outside world, effectively preventing dust or rainwater from entering the shell, ensuring a stable operating environment for the signal acquisition unit, and improving the overall service life and detection accuracy of the device.

[0016] Other features and advantages of this disclosure will be described in detail in the following detailed description section. Attached Figure Description

[0017] The accompanying drawings are provided to further illustrate the present disclosure and form part of the specification. They are used together with the following detailed description to explain the present disclosure, but do not constitute a limitation thereof. In the drawings:

[0018] Figure 1 This is a schematic diagram of the structure of an acoustic emission detection device for industrial storage tanks, according to an exemplary embodiment.

[0019] Figure 2 This is a schematic diagram of the structure of a noise reduction unit according to an exemplary embodiment.

[0020] Explanation of reference numerals in the attached figures:

[0021] 1-Waveguide rod, 2-Acoustic emission sensor, 3-Positioning flange, 4-Housing, 5-End cap, 51-Limiting part, 52-Snap fastener, 521-Flange, 53-Receiving cavity, 6-Wave-damping base, 61-Conductive layer, 62-Damping layer, 63-Mass ring, 7-Connector, 8-Cable, 9-Rotor cover, 91-Extension, 10-Annealed soft metal foil, 11-Elastic element, 12-Gasket, 13-Damping coating, 101-Acoustic wave acquisition surface, 102-Storage tank. Detailed Implementation

[0022] The specific embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this disclosure.

[0023] In this disclosure, unless otherwise stated, directional terms such as "top" and "bottom" generally refer to the top and bottom of the relevant components in actual use, as shown in the reference. Figure 1 In the diagram, the relatively thinner end of waveguide rod 1 is the top, and the relatively thicker end is the bottom. "Inner" and "outer" refer to the inner and outer sides of the relevant components relative to the actual contour. Furthermore, the terms "first," "second," etc., used in this disclosure are for distinguishing one element from another and do not indicate sequence or importance.

[0024] This disclosure provides an acoustic emission detection device for industrial storage tanks, with reference to... Figure 1 and Figure 2 The acoustic emission detection device includes a signal acquisition unit, a protection unit, and a noise reduction unit. The signal acquisition unit includes a waveguide rod 1 extending horizontally and an acoustic emission sensor 2 mounted on top of the waveguide rod 1. A positioning flange 3 is provided at the bottom of the waveguide rod 1 for positioning and connecting the bottom of the waveguide rod 1 to the side wall of the storage tank 102. The protection unit includes a housing 4 and a wave-damping base 6. The housing 4 covers the outside of the signal acquisition unit, and the wave-damping base 6 is located at the end of the housing 4 near the side wall of the storage tank 102, and is configured to be positioned and connected to the side wall of the storage tank 102. The noise reduction unit includes an end cap 5 and a wiring assembly. The end cap 5 is fastened to the end of the housing 4 furthest from the storage tank 102 and selectively connected to the housing 4. The wiring assembly is located at the center of the end cap 5.

[0025] In the above embodiment, the waveguide rod 1 in the signal acquisition unit extends horizontally, transmitting the acoustic emission signal generated by leakage or other unforeseen conditions on the wall of the storage tank 102 to the acoustic emission sensor 2 at the top, enabling signal acquisition and real-time monitoring. The positioning flange 3 at the bottom of the waveguide rod 1 can be positioned and connected to the side wall of the storage tank 102, ensuring the stability and continuity of signal transmission and preventing signal attenuation due to loose connections. Simultaneously, the housing 4 of the protective unit covers the outside of the signal acquisition unit, forming a fully enclosed protective structure that blocks external dust or rainwater and prevents mechanical collisions from damaging internal components. The wave-damping base 6 connects the housing 4 to the side wall of the storage tank 102, enabling both fixed installation of the protective unit and blocking the transmission of vibration noise from the storage tank 102 itself to the housing 4, reducing background interference. The end cap 5 of the noise reduction unit is detachably connected to the housing 4, facilitating the installation, debugging, and maintenance of internal components. The centrally located cable outlet neatly leads out the detection cable, and together with the end cap 5, achieves internal noise reduction, improving the detection purity of the acoustic emission signal.

[0026] It should be noted that the positioning flange 3 can be internally embedded with magnetic material (such as a high-strength magnet), allowing it to be magnetically connected to the side wall of the storage tank 102. Those skilled in the art can also employ other connection methods based on actual usage requirements, which will not be elaborated upon here. Furthermore, the waveguide rod 1 can be made of 316L stainless steel, which can ensure the strength of the waveguide rod 1 while improving signal transmittance and ensuring monitoring accuracy.

[0027] Through the above technical solution, the signal acquisition unit and the protection unit of this device are set up separately, with an air suspension gap between them. The housing 4 and the storage tank 102 are connected by a wave-damping base 6 to prevent Lamb waves from being transmitted to the acoustic emission sensor 2 and causing signal interference. This can be combined with the noise reduction unit to effectively improve the signal-to-noise ratio. At the same time, an end cap 5 is provided at the end of the housing 4 to seal the internal space of the housing 4, blocking the signal acquisition unit from contact with the outside world, effectively preventing dust or rainwater from entering the housing, ensuring a stable operating environment for the signal acquisition unit, and improving the overall service life and detection accuracy of the device.

[0028] For example, refer to Figure 1 and Figure 2 The end cap 5 may include a snap fastener 52 and a limiting part 51. The snap fastener 52 may be provided on the edge of the end cap 5 and protrude in the direction of the storage tank 102. The inner circumferential wall of the snap fastener 52 may be provided with a flange 521 for engaging with the outer wall of the housing 4 so that the end cap 5 is connected to the housing 4. The limiting part 51 may be evenly spaced along the radial direction of the end cap 5 on the inner side of the end cap 5 so that the inner side of the end cap 5 is divided into a plurality of annular receiving cavities 53.

[0029] In the above embodiment, the flange 521 provided on the inner wall of the buckle 52 on the edge of the end cover 5 can form an interference fit with the outer wall of the housing 4, enabling quick assembly and disassembly of the end cover 5 and the housing 4 without the need for bolts or other fasteners. This facilitates on-site installation and subsequent maintenance, improving the ease of use of the device. The flange 521 can be made of elastic material to avoid physical damage to the surface of the housing 4 during assembly and disassembly, thereby improving the service life and airtightness of the device. It should be noted that an annular groove corresponding to the flange 521 can be provided on the outer wall of the housing 4 to accommodate the flange 521, allowing the assembly and disassembly process to be completed with simple pressing or prying actions, making the operation simple and convenient. At the same time, the limiting parts 51 on the inner side of the end cover 5 are evenly distributed radially, dividing the interior of the end cover 5 into multiple independent annular receiving cavities 53. This structure can disperse and attenuate noise and electromagnetic interference, while providing installation space for internal noise reduction components, forming a multi-level noise reduction structure, further improving the anti-interference capability of the device. The evenly distributed limiting parts 51 can also enhance the structural strength of the end cover 5, prevent the end cover 5 from deforming during long-term use, and ensure sealing and noise reduction effects.

[0030] For example, refer to Figure 1and Figure 2 The noise reduction unit may also include a rotor cover 9, disposed between the end cover 5 and the waveguide rod 1, for pressing the acoustic emission sensor 2 toward the waveguide rod 1. A plurality of extensions 91 may be provided on the side of the rotor cover 9 away from the waveguide rod 1. The plurality of extensions 91 may be configured to be evenly spaced along the radial direction of the rotor cover 9. The extensions 91 may at least partially extend into the receiving cavity 53 and each extension 91 is respectively disposed opposite to a receiving cavity 53. The extensions 91 and the end cover 5 may be configured not to contact each other.

[0031] In the above embodiment, the rotor cover 9 is disposed between the end cover 5 and the waveguide rod 1, which can press the acoustic emission sensor 2 axially to ensure that the sensor 2 and the top of the waveguide rod 1 are tightly fitted, eliminating signal attenuation caused by contact gaps and ensuring accurate transmission of acoustic emission signals. The extensions 91 on the outer side of the rotor cover 9 are evenly distributed radially and extend into the receiving cavity 53 of the end cover 5 one by one, forming a nested noise reduction structure, which causes the incoming sound waves to be reflected multiple times, increasing the sound path and attenuating vibration noise and electromagnetic interference. At the same time, the extensions 91 and the end cover 5 do not contact each other, avoiding rigid transmission between them, blocking the noise transmission path, preventing interference signals from being transmitted to the sensor 2 through the end cover 5, minimizing interference to the detection signal, and improving the detection capability of the acoustic emission signal of the device.

[0032] For example, refer to Figure 1 and Figure 2 The cable outlet assembly may include a connector 7, a gasket 12, and an elastic element 11. The connector 7 may be located at the center of the end cover 5. The gasket 12 may be attached to the surface of the acoustic emission sensor 2. The elastic element 11 may be located between the gasket 12 and the rotor cover 9 to provide preload along the axial direction of the waveguide rod 1. The acoustic emission sensor 2 may be provided with a cable 8, which may be configured to pass through the gasket 12, the elastic element 11, the rotor cover 9, and the connector 7 in sequence through the end cover 5.

[0033] In the above embodiment, connector 7 serves as the external interface of cable 8, employing a central layout to ensure the cable 8's exit path is centered, preventing damage from bending or pulling. The end cap 5 may have a central mounting hole, and connector 7 can be made of waterproof material. Gasket 12 is attached to the surface of acoustic emission sensor 2, protecting it from damage caused by the elastic element 11, ensuring even pressure distribution, and isolating rotational torque to protect the connection between cable 8 and acoustic emission sensor 2. The elastic element 11 is positioned between gasket 12 and rotor cover 9, providing a constant preload along the waveguide rod 1 axis, ensuring the sensor 2 remains in close contact with the waveguide rod 1, eliminating loosening issues caused by long-term use, and guaranteeing stable signal transmission. Cable 8 passes through each component sequentially along the central path, with neat and interference-free routing to ensure accurate detection signals. After passing through connector 7, cable 8 can immediately bend downwards to form a drip bend, preventing rainwater from flowing back along the cable.

[0034] For example, refer to Figure 1 and Figure 2 The walls of the limiting part 51 and the extension part 91 may be respectively provided with a damping coating 13, and the material of the damping coating 13 may be microporous polyurethane or modified damping slurry.

[0035] In the above embodiment, the damping coating 13 on the walls of the limiting part 51 and the extension part 91 is made of microporous polyurethane or modified damping slurry material, which can effectively absorb the high-frequency noise energy reflected multiple times in the gap, and has good vibration absorption and noise attenuation performance. Combined with the bow-shaped maze effect formed by the limiting part 51 and the extension part 91, it can achieve a better silent protection effect and improve the signal-to-noise ratio of the detection signal.

[0036] For example, refer to Figure 1 The axial cross-sectional profile of waveguide rod 1 can be set to an exponential curve shape and configured to gradually decrease from the bottom to the top of waveguide rod 1.

[0037] In the above embodiment, the waveguide rod 1 adopts an exponential curve axial cross-section with a gradually decreasing profile from bottom to top, which conforms to the transmission law of acoustic emission signals. This allows for efficient and distortion-free transmission of the acoustic emission signals from the tank 102 wall to the acoustic emission sensor 2, while simultaneously attenuating the low-frequency vibration noise of the tank 102 itself. It should be noted that the gradually changing structure of the exponential curve reduces signal reflection and scattering during transmission, lowers signal loss, and improves signal transmission efficiency. Compared to a waveguide rod with a constant cross-section, it achieves a physical gain in acoustic wave energy while precisely filtering out invalid noise, ensuring the authenticity and effectiveness of the detected signal.

[0038] For example, refer to Figure 1A sound wave collecting surface 101 can be provided on the side of the positioning flange 3 facing the storage tank 102. The sound wave collecting surface 101 can be configured to protrude from the bottom of the positioning flange 3 toward the storage tank 102, and the protrusion distance of the sound wave collecting surface 101 can be set to 0.1mm to 0.2mm.

[0039] In the above embodiment, the acoustic wave acquisition surface 101 of the positioning flange 3 adopts a micro-protrusion design, with the protrusion distance controlled between 0.1mm and 0.2mm. When the positioning flange 3 is connected to the side wall of the storage tank 102, the acoustic wave acquisition surface 101 can preferentially make close contact with the wall of the storage tank 102, eliminating the macroscopic gap between the positioning flange 3 and the wall, ensuring efficient coupling and acquisition of acoustic emission signals. This not only ensures the fit between the signal acquisition surface 101 and the wall of the storage tank 102, but also prevents the positioning flange 3 from being misaligned due to excessive protrusion, thereby improving the signal coupling effect and installation positioning accuracy, and ensuring stable acquisition of acoustic emission signals.

[0040] For example, refer to Figure 1 An annealed soft metal foil 10 can be provided between the acoustic wave acquisition surface 101 and the side wall of the storage tank 102. It can be configured to undergo plastic deformation when the positioning flange 3 is positioned and connected to the storage tank 102 to fill the coupling gap between the acoustic wave acquisition surface 101 and the side wall of the storage tank 102.

[0041] In the above embodiments, the annealed soft metal foil 10 has good plastic deformation ability. When the positioning flange 3 is locked to the side wall of the storage tank 102, it can be squeezed to fill the gap between the acoustic wave acquisition surface 101 and the wall of the storage tank 102, achieving local high-pressure dense contact, i.e., "dry coupling", reducing signal attenuation caused by air gaps. It should be noted that the soft metal foil 10 will not scratch the wall of the storage tank 102, and at the same time has good acoustic wave conduction performance, which does not affect the acquisition efficiency of acoustic emission signals, and can solve the problems of high-temperature failure and low-temperature solidification of traditional coupling agents.

[0042] For example, the materials of the shell 4 and the end cap 5 can be set as plastic materials, and the inner wall of the shell 4 and the inner side of the end cap 5 can be respectively provided with conductive shielding layers. The conductive shielding layers are configured to be connected to the side wall of the storage tank 102 through the wave-damping base 6 and grounded.

[0043] In the above embodiment, the shell 4 and end cap 5 are made of plastic materials, such as ASA (acrylonitrile-styrene-acrylate terpolymer), an engineering plastic with characteristics such as light weight, corrosion resistance, and easy processing, making them suitable for outdoor environments of industrial storage tanks. Simultaneously, the plastic material can block some mechanical vibration transmission, aiding in noise reduction. The conductive shielding layer on the inner wall effectively blocks external electromagnetic interference (such as industrial electromagnetic interference, lightning interference, etc.), preventing electromagnetic signals from interfering with the acoustic emission detection signal. The conductive shielding layer is connected to the side wall of the storage tank 102 and grounded through the wave-damping base 6, allowing the shielded electromagnetic interference to be quickly discharged to the ground, forming a complete electromagnetic shielding grounding system. This further enhances the device's anti-electromagnetic interference capability, ensuring that the detection signal is not affected by the external electromagnetic environment.

[0044] For example, refer to Figure 1 The wave-damping base 6 may include a conductive layer 61, a damping layer 62, and a mass ring 63. The conductive layer 61 may be made of a magnetic conductive material for magnetic connection and conductive communication with the side wall of the storage tank 102. The damping layer 62 may be disposed on the side of the conductive layer 61 away from the storage tank 102. The mass ring 63 may be disposed on the side of the damping layer 62 away from the conductive layer 61 and connected to the shell 4.

[0045] In the above embodiment, the wave-damping base 6 adopts a three-layer composite structure, with a conductive layer 61, a damping layer 62, and a mass ring 63 sequentially arranged from the side wall of the storage tank 102 outwards. The conductive layer 61 can be made of flexible magnetic rubber filled with conductive metal powder, allowing for quick magnetic connection to the side wall of the metal storage tank 102. This facilitates installation, ensures smooth electrical conductivity, and guarantees reliable grounding of the shielding layer. The damping layer 62 can be made of modified butyl rubber, utilizing its high loss factor to absorb and dissipate background Lamb waves propagating along the wall, reducing interference with the detection signal. The mass ring 63, connected to the shell 4, can be made of 304 stainless steel, and its mass can be set to three times or more the mass of the shell 4. Based on the principle of acoustic impedance mismatch, the mass ring 63 can reflect residual acoustic energy back to the side wall of the storage tank 102, preventing noise from entering the shell 4 and improving the accuracy of signal detection.

[0046] In actual use, the operator first cleans the area to be tested on the side wall of the storage tank 102 and places the annealed soft metal foil 10. Then, holding the signal acquisition unit, the operator uses the suction force of the positioning flange 3 to attach it to the foil. At this time, due to the slightly convex design of the acoustic wave acquisition surface 101, the magnetic force concentrates and compresses the foil to produce plastic deformation, completing the dry coupling. Next, the protective unit is placed over the signal acquisition unit and fixed on the wave-damping base 6. Then, the acoustic emission sensor 2 can be placed, and the cable 8 is passed through the gasket 12, the elastic element 11, and the rotor cover 9 in sequence. The slack of the cable 8 is adjusted, and finally the end cover 5 is tightened. Then, the outer shell 4 and the end cover 5 are locked by the buckle 52, and the cable is passed out from the connector 7 to complete the overall installation of the device. At this time, acoustic emission signal acquisition can be performed.

[0047] The preferred embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings. However, the present disclosure is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0048] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.

[0049] Furthermore, various different embodiments of this disclosure can be combined in any way, as long as they do not violate the spirit of this disclosure, they should also be regarded as the content disclosed in this disclosure.

Claims

1. An acoustic emission detection device for industrial storage tanks, characterized in that, include: The signal acquisition unit includes a waveguide rod extending horizontally and an acoustic emission sensor disposed on the top of the waveguide rod. The bottom of the waveguide rod is provided with a positioning flange for positioning and connecting the bottom of the waveguide rod to the side wall of the storage tank. The protective unit includes a housing and a wave-blocking base. The housing is installed outside the signal acquisition unit, and the wave-blocking base is located at one end of the housing near the side wall of the storage tank. The wave-blocking base is configured to be positioned and connected to the side wall of the storage tank. The device also includes a noise reduction unit, comprising an end cap and a cable outlet assembly. The end cap is fastened to the end of the housing away from the storage tank and is selectively connected to the housing. The cable outlet assembly is located at the center of the end cap.

2. The acoustic emission detection device according to claim 1, characterized in that, The end cap includes: A buckle is provided on the edge of the end cap and protrudes towards the storage tank. The inner circumferential wall of the buckle is provided with a flange for engaging with the outer wall of the shell to connect the end cap to the shell. The limiting portion is evenly spaced along the radial direction of the end cap on the inner side of the end cap so that the inner side of the end cap is divided into a plurality of annular receiving cavities.

3. The acoustic emission detection device according to claim 2, characterized in that, The noise reduction unit further includes a rotor cover disposed between the end cover and the waveguide rod, used to press the acoustic emission sensor towards the waveguide rod. The rotor cover has multiple extensions on its side away from the waveguide rod, and these extensions are configured to be evenly spaced radially along the rotor cover. The extension portion extends at least partially into the receiving cavity and each extension portion is disposed opposite to one of the receiving cavities, and the extension portion and the end cap are configured not to contact each other.

4. The acoustic emission detection device according to claim 3, characterized in that, The outgoing component includes: The connector is located at the center of the end cap; A gasket is attached to the surface of the acoustic emission sensor; And an elastic element, disposed between the gasket and the rotor cover, for providing preload along the axial direction of the waveguide rod. The acoustic emission sensor is equipped with a cable, which is configured to pass through the gasket, the elastic element, the rotor cover and the connector in sequence and pass through the end cover.

5. The acoustic emission detection device according to claim 3, characterized in that, The walls of the limiting part and the extension part are respectively provided with a damping coating, and the material of the damping coating is microporous polyurethane or modified damping slurry.

6. The acoustic emission detection device according to claim 1, characterized in that, The axial cross-sectional profile of the waveguide rod is set to an exponential curve shape and configured to gradually decrease from the bottom to the top of the waveguide rod.

7. The acoustic emission detection device according to claim 1, characterized in that, The positioning flange has an acoustic wave collecting surface on the side facing the storage tank. The acoustic wave collecting surface is configured to protrude from the bottom of the positioning flange toward the storage tank, and the protrusion distance of the acoustic wave collecting surface is set to 0.1mm to 0.2mm.

8. The acoustic emission detection device according to claim 7, characterized in that, An annealed soft metal foil is provided between the acoustic wave acquisition surface and the side wall of the storage tank, configured to undergo plastic deformation when the positioning flange is positioned and connected to the storage tank to fill the coupling gap between the acoustic wave acquisition surface and the side wall of the storage tank.

9. The acoustic emission detection device according to claim 1, characterized in that, The shell and the end cap are made of plastic material. The inner wall of the shell and the inner side of the end cap are respectively provided with conductive shielding layers. The conductive shielding layers are configured to be connected to the side wall of the storage tank through the wave-damping base and grounded.

10. The acoustic emission detection device according to claim 9, characterized in that, The wave-blocking base includes: The conductive layer, made of a magnetic conductive material, is used to magnetically connect with and electrically communicate with the side wall of the storage tank. A damping layer is disposed on the side of the conductive layer away from the storage tank; And a mass ring, disposed on the side of the damping layer away from the conductive layer and connected to the housing.

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