Self-adaptive adsorption industrial stethoscope based on double-microphone structure

Abstract

The utility model discloses a self-adaptive adsorption industrial stethoscope based on a double-microphone structure, and relates to the technical field of mechanical vibration and acoustic detection, the self-adaptive adsorption industrial stethoscope comprises a stethoscope head and an electronic acquisition module; the auscultation head comprises an auscultation head shell, a hyperbolic flexible suction cup, an elastic membrane, a mechanical linkage assembly and an acoustic conversion assembly. The hyperbolic flexible suction cup is fixed to the front end of the stethoscope head shell, and the elastic membrane is sealed in an inner cavity to define a closed coupling cavity. And the operation piece of the mechanical linkage assembly rotates to drive the traction piece to displace, so that the elastic membrane deforms to generate negative pressure. The acoustic conversion assembly comprises a main microphone located in the closed coupling cavity and an auxiliary microphone located on the outer wall of the auscultation head shell. The hyperbolic flexible suction cup is matched with a mechanical negative pressure structure, so that single-hand fixation and self-adaptive adsorption on surfaces with various curvatures are realized, a stable acoustic measurement channel is established, and handheld jitter noise is avoided; through the physically isolated internal and external dual-microphone layout, the environmental noise is separated from the hardware source, and the measurement signal-to-noise ratio is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to mechanical vibration and acoustic detection technical field, and especially relates to a kind of self-adaptive adsorption industrial stethoscope based on double microphone structure. BACKGROUND

[0002] The vibration and acoustic signals generated by mechanical equipment during operation contain rich state information, and by collecting and analyzing these acoustic signals, it can be determined whether there are wear, looseness or abnormal sound faults inside the equipment. As a typical acoustic detection device, the core performance of industrial stethoscope depends on the coupling efficiency of the pickup head and the surface of the equipment to be measured and the physical isolation ability of the pickup structure to environmental noise.

[0003] The existing industrial stethoscope still has the following technical defects in structural design:

[0004] Firstly, in terms of the fixation and coupling structure of the pickup head, the traditional stethoscope mostly uses a handheld rigid probe, and the operator needs to continuously press to maintain contact, which can easily introduce friction noise caused by hand shaking. In order to solve the fixation problem, Chinese patent document CN221173617U discloses a "stethoscope", which adopts a structure of three-way pipe, support assembly and adsorption assembly, and uses an external air bag to generate negative pressure for adsorption. However, from the mechanical structure, this scheme adopts a "split pneumatic structure", which requires two hands to operate, i.e. one hand holds the head and the other hand squeezes the air bag, which is not convenient to operate; and its adsorption end is mostly a flat structure, which is difficult to form effective airtightness for the small-radius cylindrical or irregular curved surfaces commonly found in industrial sites such as motor housings and oil pipelines, resulting in air leakage of the coupling cavity and seriously affecting the pickup efficiency of acoustic signals.

[0005] Secondly, in terms of noise resistance performance of acoustic structure, industrial sites are usually filled with high-decibel environmental background noise. Existing technologies such as Chinese patent document CN113624473A disclose a "high-precision industrial stethoscope", which has a soundproof sponge cover to reduce external interference, but from the physical structure analysis, this passive physical shielding structure has limited ability to isolate low-frequency penetrating noise. More importantly, the existing pickup head structure usually only sets a single microphone structure, and this single-channel hardware layout cannot separate "vibration sound of the device body" from "background sound of the external environment" at the physical level. Due to the lack of independent reference signal collection structure, the subsequent circuit cannot obtain pure acoustic signals, resulting in low signal-to-noise ratio of the final output signal and difficulty in capturing weak early fault characteristics.

[0006] In summary, the prior art lacks an industrial stethoscope that can achieve single-handed operation and curved surface adaptive adsorption through a mechanical linkage structure, and can achieve environmental noise separation from a hardware source through a physically separate dual-channel pickup layout. Utility model content

[0007] To solve the above technical problems, the utility model provides an adaptive adsorption industrial stethoscope based on a double microphone structure, aiming to improve acoustic coupling stability through an improved mechanical adsorption structure and improve noise resistance through a double-channel microphone structure.

[0008] The utility model provides a kind of adaptive adsorption industrial stethoscope based on double microphone structure, including electronic acquisition module and stethoscope head, and electronic acquisition module is connected with stethoscope head by conduit.Stethoscope head includes stethoscope head shell, double-curved flexible suction cup, elastic diaphragm, mechanical linkage assembly and acoustic conversion component.Double-curved flexible suction cup is fixedly connected in stethoscope head shell's front end in airtightness, and elastic diaphragm is sealed and arranged in the internal cavity of stethoscope head shell;Closed coupling cavity is formed between the inner surface of double-curved flexible suction cup and the front surface of elastic diaphragm.Mechanical linkage assembly includes traction piece and operating part;Traction piece is fixedly connected with elastic diaphragm at one end in the inside of stethoscope head shell, and the other end extends to outside through the rear wall of stethoscope head shell;Operating part is rotatably connected with the end of traction piece extending to outside by pin shaft;The rotating end of operating part is equipped with arc abutment surface abutting on the surface of stethoscope head shell.Acoustic conversion component includes main microphone and auxiliary microphone;Main microphone is fixed in the inside of closed coupling cavity;Auxiliary microphone is fixed on the outer wall of stethoscope head shell;Main microphone and auxiliary microphone are electrically connected with electronic acquisition module.

[0009] Further, double-curved flexible suction cup is in the form of a horn, with a double-curved arc surface on its inner wall, and a ring-shaped lip folded outward at its front end edge.This structure design enables the suction cup to elastically deform in response to the geometric shape of the contact surface under the action of negative pressure, so that a reliable seal can be formed on a plane, a cylindrical surface or an irregular curved surface.

[0010] Further, the edge of the elastic diaphragm is sealingly fixed to the inner wall of the stethoscope head shell.This ensures that the elastic diaphragm changes the volume of the closed coupling cavity through axial displacement of the center with the edge as the fulcrum.

[0011] Further, the traction piece is a connecting rod, and the center of the stethoscope head shell is provided with a center guide hole extending in the axial direction, and the connecting rod is slidably arranged in the center guide hole.This ensures the stability of movement during the generation of negative pressure.

[0012] Further, one end of the connecting rod inside the stethoscope head shell is fixedly connected with the center of the elastic diaphragm, and the other end extends to the outside through the rear wall of the stethoscope head shell.

[0013] Further, the operating member is an L-shaped rod structure, comprising an integral handle part and an arc-shaped head part, and an arc-shaped abutting surface is formed on the outer edge of the arc-shaped head part. This structure facilitates one-handed operation.

[0014] Further, the arc-shaped abutting surface has a first abutting position and a second abutting position in the circumferential profile, and the radial distance from the first abutting position to the shaft center of the pin shaft is smaller than the radial distance from the second abutting position to the shaft center of the pin shaft. By rotating the operating member to switch the abutting position, the axial movement of the traction member is driven by the change of the eccentric distance, thereby controlling the generation and release of negative pressure.

[0015] Further, the main microphone is attached to one side surface of the elastic diaphragm facing the hyperbolic flexible suction cup, and the sound collecting hole of the main microphone faces the inside of the hyperbolic flexible suction cup. So that the main microphone directly picks up the device vibration sound waves transmitted through the sealed coupling cavity.

[0016] Further, the outer wall of the stethoscope head shell is provided with a mounting groove, and the auxiliary microphone is embedded in the mounting groove, and the sound collecting hole of the auxiliary microphone faces the outside of the stethoscope head shell. So that the auxiliary microphone mainly collects the background noise of the surrounding environment.

[0017] Further, one end of the catheter is connected to the side wall of the stethoscope head shell, and the other end is connected to the front end of the electronic acquisition module; wires connecting the main microphone, the auxiliary microphone and the electronic acquisition module are arranged in the internal cavity of the catheter.

[0018] The beneficial effects of the utility model lie in:

[0019] Adaptive acoustic coupling: through the cooperation of the hyperbolic flexible suction cup and the mechanical negative pressure structure, not only is the single-handed convenient fixing realized, but also various curvature radius industrial equipment surfaces can be adapted to, a stable acoustic measurement channel is established, and friction noise introduced by hand holding shaking is avoided.

[0020] Hardware level noise separation: a "main microphone in a sealed cavity" and an "auxiliary microphone on the outer wall" layout are adopted. The main microphone focuses on collecting the mechanical vibration sound of the target device, and the auxiliary microphone focuses on collecting the environmental noise. This double-channel hardware structure provides a high-quality independent signal source for the differential noise reduction processing of the subsequent circuit, and solves the problem of low signal-to-noise ratio of the traditional single-microphone stethoscope from the physical layer. BRIEF DESCRIPTION OF DRAWINGS

[0021] The accompanying drawings are included to provide a further understanding of embodiments and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments and, together with the description, serve to explain the principles of the present utility model. Other embodiments and many of the intended advantages of the present utility model will be readily appreciated as the same becomes better understood by reference to the following detailed description. The elements of the drawings are not necessarily to scale. Like reference numerals designate corresponding similar parts throughout the various drawings.

[0022] Figure 1 is the overall structure left view of the industrial stethoscope according to the embodiment of the application;

[0023] Figure 2 is the overall structure right view of the industrial stethoscope according to the embodiment of the application;

[0024] Figure 3 is the structure section view of the stethoscope head according to the embodiment of the application;

[0025] Figure 4 is the perspective exploded view of the stethoscope head according to the embodiment of the application;

[0026] Figure 5 is the explosion view of the industrial stethoscope according to the embodiment of the application;

[0027] Figure 6 is the structure block diagram of the electronic acquisition module according to the embodiment of the application.

[0028] Meaning of each number in the figure:

[0029] 1 - double-curved flexible suction cup; 2 - elastic diaphragm; 21 - main microphone; 22 - traction piece; 3 - stethoscope head shell; 31 - auxiliary microphone; 32 - sealed coupling cavity; 33 - mounting groove; 34 - center guide hole; 4 - operating piece; 41 - pin shaft; 42 - handle part; 43 - arc-shaped head part; 431 - arc-shaped abutting surface; 5 - catheter; 6 - electronic acquisition module; 63 - pickup amplification module; 64 - audio processing module; 65 - Bluetooth module; 66 - memory; 67 - main control module. DETAILED DESCRIPTION

[0030] In the following detailed description, reference is made to the accompanying drawings, which form a part hereof, and in which are shown by way of illustration specific embodiments in which the application can be practiced. For purposes of explanation and illustration, directional terms are used herein to describe the orientation of the described embodiments. However, it is to be understood that the application can assume many different orientations, unless otherwise specified herein. The directional terms used herein, such as "top," "bottom," "left," "right," "up," "down," and the like, are used for purposes of illustration and explanation only and are not intended to be limiting. It is to be understood that other embodiments can be utilized and structural or logical changes can be made without departing from the scope of the present application. The following detailed description is, therefore, not to be taken in a limiting sense, and the scope of the present application is defined by the appended claims.

[0031] Embodiment one

[0032] Figure 1 is the overall structure left view of the industrial stethoscope according to the embodiment of the application; Figure 2 is the overall structure right view of the industrial stethoscope according to the embodiment of the application. AsFigure 1 And Figure 2 As shown in the figure, the embodiment provides an adaptive adsorption industrial stethoscope based on a double microphone structure, mainly including a stethoscope head, a catheter 5 and an electronic acquisition module 6. The stethoscope head is located at the front end of the industrial stethoscope, used for adsorbing on the surface of the equipment to be measured and picking up sound. The catheter 5 is a hollow tube with flexibility, one end of which is mechanically connected to the lower side wall of the stethoscope head shell 3, and the other end is connected to the front end of the electronic acquisition module 6. The inside of the catheter 5 is provided with wires connecting the main microphone 21, the auxiliary microphone 31 and the electronic acquisition module 6, realizing the electrical conduction and signal transmission between the internal components of the stethoscope head and the electronic acquisition module 6. The electronic acquisition module 6 is used as a handheld terminal, as shown in the figure, the surface of which is provided with a display and key module 61 for waveform display and human-computer interaction; as shown in the figure, the tail end of which is provided with a battery back cover 62 for installing power supply. Figure 1 Figure 1 And Figure 2 As shown in the figure, the tail end of which is provided with a battery back cover 62 for installing power supply.

[0033] Figure 3 is a structure sectional view of the stethoscope head according to the embodiment of the application; Figure 4 is a perspective exploded view of the stethoscope head according to the embodiment of the application. As shown in the figure, the stethoscope head is mainly composed of a double-curved flexible suction cup 1, an elastic diaphragm 2, a stethoscope head shell 3, a mechanical linkage assembly and an acoustic conversion assembly. Figure 3 Figure 4

[0034] ​​​The stethoscope head shell 3 is the main supporting part of the stethoscope head, and has a cavity inside. The double-curved flexible suction cup 1 is airtightly fixed at the front end of the stethoscope head shell 3. The double-curved flexible suction cup 1 is trumpet-shaped and is made of flexible materials such as rubber or silicone, and the inner wall surface is designed as a continuous and uniform double-curved circular arc surface, and the cross-sectional profile is a smooth transition curve. The disc opening area of the double-curved flexible suction cup 1 in contact with the equipment is made of smooth flexible material, and the surface is free of air leakage holes or notches; a thick outwardly folded annular lip is arranged at the front end edge of the double-curved flexible suction cup 1, and the contact area with the equipment surface is effectively enlarged through the thick design, thereby enhancing the negative pressure adsorption performance. In addition, the size parameters of the double-curved flexible suction cup 1 can be flexibly adjusted according to the needs of different industrial scenes, so that it can fully fit the target equipment of different sizes after negative pressure deformation. The structure of the double-curved circular arc surface and the annular lip enables the suction cup to deform nonlinearly in response to the curvature of the contact surface under the action of pressure and negative pressure, thereby tightly fitting the surfaces of equipment with different curvatures such as planes, barrels or pipes. The elastic diaphragm 2 is located between the double-curved flexible suction cup 1 and the stethoscope head shell 3 and is sealingly arranged in the internal cavity at the front end of the stethoscope head shell 3. The edge of the elastic diaphragm 2 is sealingly fixed to the inner wall of the stethoscope head shell 3 (for example, by pressing or bonding), so as to ensure that the edge is airtight and does not displace. A closed coupling cavity 32 is formed between the inner surface of the double-curved flexible suction cup 1 and the front surface of the elastic diaphragm 2, which is both a power source for generating negative pressure and a coupling channel for sound wave transmission.

[0035] A mechanical linkage assembly is arranged on the stethoscope head shell 3 and is used to drive the elastic diaphragm 2 to deform to generate negative pressure. As shown in Figure 3 , the mechanical linkage assembly includes a traction member 22 and an operating member 4. The center of the stethoscope head shell 3 is provided with a center guide hole 34 extending in the axial direction, and the traction member 22 is a rigid connecting rod which is sealingly and slidably arranged in the center guide hole 34. One end of the traction member 22 extends into the interior of the stethoscope head shell 3 and is fixedly connected with the geometric center of the elastic diaphragm 2, and the other end extends to the outside through the rear wall of the stethoscope head shell 3.

[0036] Figure 5 is a blasting diagram of the industrial stethoscope according to the embodiment of the present application. As Figure 5 combined Figure 3As shown, the operating member 4 is rotationally connected to the extension end of the traction member 22 through the pin shaft 41. The operating member 4 is an L-shaped rod structure, including an integral handle portion 42 and an arc-shaped head portion 43. The outer edge of the arc-shaped head portion 43 is formed with an arc-shaped abutting surface 431, which abuts against the rear surface of the stethoscope head shell 3. The arc-shaped abutting surface 431 has a first abutting position and a second abutting position in the circumferential profile, and the radial distance from the first abutting position to the shaft center of the pin shaft 41 is smaller than the radial distance from the second abutting position to the shaft center of the pin shaft 41. When the operator rotates the handle portion 42 with one hand, the contact point of the arc-shaped abutting surface 431 with the stethoscope head shell 3 changes, and the pin shaft 41 is forced to move linearly backward with the traction member 22, thereby pulling the center of the elastic diaphragm 2 to produce axial deformation.

[0037] As shown in the figure, Figure 3 The acoustic conversion assembly adopts a physically separate double-channel layout, including a main microphone 21 and a secondary microphone 31. The main microphone 21 is fixedly installed inside the closed coupling cavity 32, specifically attached to the center of the side surface of the elastic diaphragm 2 facing the suction cup, and its sound collecting hole directly faces the inside of the suction cup. This position makes it completely in the closed space, and is specially designed to pick up the device vibration sound conducted by the workpiece surface through air coupling, and effectively isolates external noise. A recessed mounting groove 33 is formed in the top of the outer wall of the stethoscope head shell 3, and the secondary microphone 31 is embedded in the mounting groove 33, with its sound collecting hole facing the outside of the stethoscope head shell 3, for directly collecting environmental background noise. The main microphone 21 and the secondary microphone 31 are electrically connected to the electronic collection module 6 through wires.

[0038] Figure 6 The structure block diagram of the electronic collection module according to the embodiment of the present application is shown in the figure. As shown in the figure, Figure 6 The electronic collection module 6 internally integrates a sound pickup amplification module 63, an audio processing module 64, a Bluetooth module 65, a memory 66, a main control module 67 (MCU), and a power module 68. In operation, the main microphone 21 and the secondary microphone 31 are connected to the input end of the sound pickup amplification module 63 through wires, and the output end of the sound pickup amplification module 63 is connected to the main control module 67. The main control module 67 is internally configured with a hardware difference circuit unit (or an integrated DSP logic circuit), the first input end of which receives the noise-containing signal collected by the main microphone 21, and the second input end receives the environmental noise reference signal collected by the secondary microphone 31; the hardware difference circuit unit is configured to perform difference processing on the noise-containing signal by using the reference signal through an analog or digital signal subtraction circuit, so as to obtain an audio signal with high signal-to-noise ratio at the signal output end.

[0039] In operation, the operator holds the stethoscope housing 3 to attach the double-curved flexible suction cup 1 to the surface of the workpiece, and the rotation plane of the operating member 4 is parallel to the extension direction of the handle portion 42, so that the operator can naturally touch and operate the operating member 4 with the thumb while holding the stethoscope housing 3, thereby realizing single-handed operation of the suction and fixation without the need for two-handed cooperation. The operator rotates the handle portion 42 of the operating member 4 by about 90 degrees by single-handed operation, and the arc-shaped abutting surface 431 forces the traction member 22 to pull the elastic diaphragm 2 to retreat. At this time, the volume of the closed coupling cavity 32 increases, the internal air pressure decreases to form a negative pressure, and the stethoscope is firmly adsorbed. The main microphone 21 picks up the sound inside the workpiece, and the auxiliary microphone 31 picks up the environmental noise, and the two signals are input into the electronic acquisition module 6 and separated from the environmental noise by the internal circuit hardware, and then a clear fault diagnosis audio is output. After the test is completed, the operating member 4 is operated in the reverse direction, the elastic diaphragm 2 is reset, the negative pressure disappears, and the stethoscope can be removed.

[0040] The beneficial effects of the present application are that: through the annular lip of the double-curved flexible suction cup, the mechanical negative pressure structure is used to ensure the adsorption stability and sealing performance of the stethoscope on the plane and the complex curved surface (such as a pipeline), and single-handed convenient operation is realized. Secondly, the physically separated double-channel sound pickup structure is adopted, the main microphone 21 is located in the closed coupling cavity 32, and the auxiliary microphone 31 is located on the outer wall, so that the separation of the environmental noise and the equipment vibration signal is realized from the hardware source, and the signal-to-noise ratio of the industrial field measurement is significantly improved.

[0041] Obviously, those skilled in the art can make various modifications and changes to the embodiments of the present application without departing from the spirit and scope of the present application. In this way, if these modifications and changes are within the scope of the claims of the present application and their equivalents, the present application also aims to cover these modifications and changes. The word "comprising" does not exclude the presence of other elements or steps not listed in the claims. The simple fact that certain measures are described in mutually different dependent claims does not mean that the combination of these measures cannot be used to advantage. Any reference signs in the claims should not be considered as limiting the scope.

Claims

1. An adaptive adsorption industrial stethoscope based on a dual-microphone structure, comprising an electronic acquisition module and a stethoscope head, wherein the electronic acquisition module and the stethoscope head are connected via a conduit, characterized in that, The stethoscope head includes a stethoscope head shell, a hyperbolic flexible suction cup, an elastic diaphragm, a mechanical linkage assembly, and an acoustic conversion assembly; The hyperbolic flexible suction cup is airtightly fixed to the front end of the stethoscope head shell, and the elastic diaphragm is sealed in the internal cavity of the stethoscope head shell; the inner surface of the hyperbolic flexible suction cup and the front surface of the elastic diaphragm form a closed coupling cavity. The mechanical linkage assembly includes a traction component and an operating component; one end of the traction component located inside the stethoscope head housing is fixedly connected to the elastic diaphragm, and the other end extends through the rear wall of the stethoscope head housing to the outside; the operating component is rotatably connected to the end of the traction component extending to the outside via a pin; the rotating end of the operating component is provided with an arc-shaped abutment surface that abuts against the surface of the stethoscope head housing. The acoustic conversion assembly includes a main microphone and a secondary microphone; the main microphone is fixed inside the sealed coupling cavity; the secondary microphone is fixed on the outer wall of the stethoscope head shell; both the main microphone and the secondary microphone are electrically connected to the electronic acquisition module.

2. The adaptive adsorption industrial stethoscope based on a dual-microphone structure according to claim 1, characterized in that, The hyperbolic flexible suction cup has a trumpet-shaped structure, the inner wall surface of the hyperbolic flexible suction cup is a hyperbolic arc surface, and the front edge of the hyperbolic flexible suction cup is provided with an outwardly folded annular lip.

3. The adaptive adsorption industrial stethoscope based on a dual-microphone structure according to claim 1, characterized in that, The edge of the elastic diaphragm is sealed and fixed to the inner wall of the stethoscope head shell.

4. The adaptive adsorption industrial stethoscope based on a dual-microphone structure according to claim 1, characterized in that, The traction component is a connecting rod; the center of the stethoscope head housing is provided with a central guide hole extending axially, and the connecting rod is slidably inserted into the central guide hole.

5. The adaptive adsorption industrial stethoscope based on a dual-microphone structure according to claim 4, characterized in that, One end of the connecting rod, located inside the stethoscope head housing, is fixedly connected to the center of the elastic diaphragm, while the other end extends through the rear wall of the stethoscope head housing to the outside.

6. The adaptive adsorption industrial stethoscope based on a dual-microphone structure according to claim 1, characterized in that, The operating component is an L-shaped rod structure, including an integrally formed handle and an arc-shaped head, with the arc-shaped contact surface formed on the outer edge of the arc-shaped head.

7. The adaptive adsorption industrial stethoscope based on a dual-microphone structure according to claim 1, characterized in that, The arc-shaped contact surface has a first contact position and a second contact position on its circumferential contour, and the radial distance from the first contact position to the center of the pin is less than the radial distance from the second contact position to the center of the pin.

8. The adaptive adsorption industrial stethoscope based on a dual-microphone structure according to claim 1, characterized in that, The main microphone is attached to the surface of the elastic diaphragm facing the hyperbolic flexible suction cup, and the microphone hole of the main microphone faces the interior of the hyperbolic flexible suction cup.

9. The adaptive adsorption industrial stethoscope based on a dual-microphone structure according to claim 1, characterized in that, The outer wall of the stethoscope head housing has a mounting groove, and the secondary microphone is embedded in the mounting groove, with the microphone hole of the secondary microphone facing the outside of the stethoscope head housing.

10. The adaptive adsorption industrial stethoscope based on a dual-microphone structure according to claim 1, characterized in that, One end of the catheter is connected to the side wall of the stethoscope head housing, and the other end is connected to the front end of the electronic acquisition module; wires connecting the main microphone, the secondary microphone and the electronic acquisition module are threaded through the internal cavity of the catheter.

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