Acoustic emission monitoring waveguide rod with function of automatically adjusting modal filtering

Abstract

The utility model relates to the technical field of waveguide rods, and discloses an acoustic emission monitoring waveguide rod capable of automatically adjusting modal filtering, which comprises a waveguide rod, one end of the waveguide rod is used for being contacted with equipment to be detected, the other end of the waveguide rod is used for being connected with a piezoelectric probe, and an opening angle is formed between the waveguide rod and the piezoelectric probe. A wedge block is arranged between the waveguide rod and the piezoelectric probe, the lower end of the wedge block is connected with the waveguide rod, the upper end of the wedge block is connected with the piezoelectric probe, and when the wedge block generates transverse displacement under the action of external force, the piezoelectric probe generates angular displacement relative to the waveguide rod, so that the field angle is changed. According to the utility model, the technical effect of long-time on-line monitoring of wave conduction under extreme working conditions can be realized, and the technical effect of improving the sensitivity of damage signal acquisition is also realized; and the installation difficulty of a traditional waveguide rod is greatly reduced by using a magnetic attraction design.

Description

TECHNICAL FIELD

[0001] The utility model relates to waveguide pole technical field especially is concerned with a kind of waveguide pole for acoustic emission monitoring with automatic adjustment modal filter. BACKGROUND

[0002] Acoustic emission monitoring equipment has the point of high sensitivity, has the whole process of detectable defect initiation, expansion and fracture, can continuously monitor and early warning to the generation of defect, expansion activity, has some advantages that other nondestructive testing means does not have, and has application in aerospace, petrochemical industry and other fields. Limited by sensor condition, acoustic emission monitoring equipment is difficult to form effective detection under extreme working conditions such as high temperature, deep cold, buried and the like. In order to break through the limitation of extreme working condition, piezoelectric probe and measured surface are usually connected by waveguide rod, and the collected signal often mixes noise due to many environmental interference factors in industrial field, which brings error to monitoring result.

[0003] In order to solve the technical defects, in the prior art, such as the paper "ultrasonic monitoring signal denoising research based on variational modal decomposition", an ultrasonic monitoring signal denoising method is proposed, the bandwidth and center frequency of each mode are calculated by variational modal decomposition, the signal mode is selected, and the noise-free signal is reconstructed according to the signal mode, 4 steps to realize the denoising of ultrasonic monitoring signal, which has good effect on the denoising of complex ultrasonic signal with different modal bandwidth and center frequency; there is also a patent CN108491355A which proposes an ultrasonic signal denoising method based on CEEMD and wavelet packet, which reduces the problem of modal aliasing and makes the decomposition of multi-modal signal more thorough;

[0004] However, these denoising technologies mainly solve the problems of multi-modal and aliasing of acoustic wave signal, ignore the denoising processing of environmental noise in engineering, and do not propose a scheme to eliminate noise at hardware level. UTILITY MODEL CONTENT

[0005] The utility model aims at solving one of the technical problems existing in the prior art. Therefore, one purpose of the utility model is to provide a waveguide rod for acoustic emission monitoring with automatic adjustment modal filter.

[0006] According to the waveguide rod for acoustic emission monitoring with automatic adjustment modal filter provided by the utility model, one end of the waveguide rod is used to contact with the equipment to be measured, the other end is used to connect with the piezoelectric probe, and the opening angle is formed between the waveguide rod and the piezoelectric probe, the wedge block is arranged between the waveguide rod and the piezoelectric probe, the lower end of the wedge block is connected with the waveguide rod, and the upper end is connected with the piezoelectric probe, when the wedge block is subjected to external force and occurs transverse displacement, the piezoelectric probe occurs angular displacement compared with the waveguide rod, so that the opening angle changes;

[0007] The advantages of the arrangement are that the integrated design of the waveguide rod and the wedge block can meet the adaptive collection of multi-frequency band damage signals in the acoustic emission monitoring process, and the collection sensitivity of the damage signals is improved; specifically, the angular displacement between the waveguide rod and the probe is changed by the displacement of the wedge block, and according to the frequency characteristics of the equipment damage signals, the appropriate opening angle can be adjusted by the wedge block, the acoustic beam with a specific waveform and angle is formed through reflection, the filtering function of the equipment damage acoustic emission signals is realized, and the purpose of reducing engineering noise is achieved.

[0008] In some examples of the utility model, the waveguide rod is formed with mutually opposite conical structures at two ends thereof, so that the two ends of the waveguide rod are formed with an upper end plane and a lower end plane, and the upper end plane and the lower end plane are used for convenient connection.

[0009] In some examples of the utility model, the upper end plane is provided with a first cover body, a space for accommodating the piezoelectric probe and the wedge block is formed between the first cover body and the upper end plane, the cable of the piezoelectric probe extends to the outside of the first cover body, and the information collected by the piezoelectric probe is transmitted to the outside through the cable.

[0010] In some examples of the utility model, the first cover body is provided with a plate member hinged at one end to the upper end plane, the piezoelectric probe is arranged at the upper end of the plate member, and the wedge block is arranged at the lower end of the piezoelectric probe; therefore, the size of the opening angle can be adjusted by the displacement of the wedge block.

[0011] In some examples of the utility model, a handle is connected to the wedge block, and the handle extends to the outside of the first cover body; therefore, the displacement of the wedge block can be controlled through the handle.

[0012] In some examples of the utility model, the waveguide rod for acoustic emission monitoring further comprises a support plate, the waveguide rod penetrates through the support plate, the lower end of the support plate is provided with a strong magnet, the support plate and the strong magnet are connected through bolts, the strong magnet is made of high-temperature magnet material, the support plate is connected with the waveguide rod and the strong magnet, and the connection between the waveguide rod and the equipment under test can be realized by magnetically attracting the strong magnet to the equipment under test.

[0013] In some examples of the utility model, a first elastic member is further abutted between the support plate and the strong magnet, and the first elastic member is used to enhance the connection stability between the strong magnet and the support plate.

[0014] In some examples of the utility model, the support plate and the waveguide rod are connected through screws.

[0015] In some examples of the utility model, the waveguide rod for acoustic emission monitoring further comprises a second cover body, the second cover body is arranged on the upper end of the supporting plate, a space is formed between the upper end of the supporting plate and the second cover body, the waveguide rod penetrates through the second cover body, and a second elastic member is abutted between the second cover body and the supporting plate, the second cover body is used to ensure the stability of the waveguide rod, so that the waveguide rod has relatively stable core, and the second elastic member is used to enhance the stability between the second cover body and the supporting plate.

[0016] The additional aspects and advantages of the utility model will be partially given in the following description, some will become obvious from the following description, or be understood through the practice of the utility model. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description, obviously, the drawings in the following description are some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without creating laboriously.

[0018] Figure 1 It is a front view of the waveguide rod for acoustic emission monitoring with automatic adjustment modal filtering in the embodiment of the utility model;

[0019] Figure 2 It is a sectional view of the waveguide rod for acoustic emission monitoring with automatic adjustment modal filtering in the embodiment of the utility model.

[0020] EXPLANATION OF REFERENCE NUMERALS:

[0021] Waveguide rod 1, conical structure 1-1, upper end plane 1-2, lower end plane 1-3;

[0022] Piezoelectric probe 2, cable 2-1, piezoelectric wafer 22, damping block 23, signal output interface 24.

[0023] Wedge block 3, handle 3-1;

[0024] First cover body 4;

[0025] Plate member 5;

[0026] Supporting plate 6;

[0027] Strong magnet 7;

[0028] Bolt 8;

[0029] First elastic member 9;

[0030] Screw 10;

[0031] Second cover body 11;

[0032] The second elastic member 12. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme of the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0034] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the features defined as "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0035] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0036] The embodiments of the present application will be described in detail below, and examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary and are only used to explain the present application, and cannot be understood as a limitation on the present application.

[0037] Figure 1 Front view of the waveguide rod for acoustic emission monitoring;

[0038] Figure 2This is a cross-sectional view of a waveguide rod for acoustic emission monitoring;

[0039] Reference below Figures 1-2 The figure shows a waveguide rod for acoustic emission monitoring according to an embodiment of the present invention.

[0040] For details, please see the attached Figures 1-2 The waveguide rod for acoustic emission monitoring includes a waveguide rod 1, which is a metal rod. One end of the waveguide rod is used to contact the device under test, and the other end is used to connect with the piezoelectric probe 2. The waveguide rod 1 can transmit the wave signal of the device under test to the piezoelectric probe 2, and the piezoelectric probe 2 derives the signal.

[0041] Please continue to see the attached Figure 2 , an angle a is formed between the waveguide rod 1 and the piezoelectric probe 2, and a wedge 3 is provided between the waveguide rod 1 and the piezoelectric probe 2. The lower end of the wedge 3 is connected to the waveguide rod 1, and the upper end is connected to the piezoelectric probe 2. When the wedge 3 is subjected to a lateral displacement by an external force, the piezoelectric probe 2 undergoes an angular displacement compared to the waveguide rod 1, causing the angle a to change. That is, the angle a is adjusted by adjusting the wedge 3, so that the angle between the waveguide rod 1 and the piezoelectric probe 2 can be freely adjusted. According to the frequency characteristics of the equipment damage signal, the appropriate wedge angle is adjusted, and a sound beam with a specific waveform and angle is formed after reflection, thereby realizing the filtering function of the equipment damage acoustic emission signal, thereby reducing engineering noise.

[0042] Please continue to see the attached Figure 2 The waveguide rod 1 has tapered structures 1-1 at both ends thereof facing away from each other, so that the two ends of the waveguide rod 1 form an upper end plane 1-2 and a lower end plane 1-3 respectively;

[0043] Specifically, the tapered structure 1-1 is a conical structure, that is, the cross-sectional diameters of both ends of the waveguide rod 1 gradually increase until a circular plane is formed, and the upper and lower planes are the upper end plane 1-2 and the lower end plane 1-3 respectively.

[0044] Please continue to see the attached Figure 2 , a first cover 4 is provided on the upper end plane 1-2, a space for accommodating the piezoelectric probe 2 and the wedge 3 is formed between the first cover 4 and the upper end plane 1-2, and the cable 2-1 of the piezoelectric probe 2 extends outside the first cover 4;

[0045] The first cover 4 is made of metal, has a square shape as a whole, and has side walls and a top wall.

[0046] Please continue to see the attached Figure 2 The first cover body 4 has a plate 5 with one end hinged to the upper end plane 1-2, the piezoelectric probe 2 is placed on the upper end of the plate 5, and the wedge 3 is placed on the lower end of the piezoelectric probe 2;

[0047] Specifically, the piezoelectric probe 2 is composed of a cable 21, a piezoelectric wafer 22, a damping block 23 and a signal output interface 24. The signal output interface 24 is installed on the first cover 4, and the piezoelectric wafer 22 directly contacts the plate 5 and is composed of a plurality of piezoelectric ceramics with different resonant frequencies, and the resonant frequencies of each piezoelectric ceramic do not overlap. The upper end of the wedge block 3 passes through the plate 5 and is coupled with the piezoelectric wafer 22, and the lower end contacts the upper end plane 1-2 of the waveguide rod 1. The acoustic emission wave generated by the damage of the device is reflected by the wedge block 3 to form a specific acoustic beam with a specific waveform and angle. The signal output interface 24 adopts a waterproof interface.

[0048] Please continue to see the attached Figure 2 The handle 3-1 extends to the outside of the first cover 4.

[0049] Please continue to see the attached Figure 2 The waveguide rod for acoustic emission monitoring also includes a support plate 6. The waveguide rod 1 penetrates the support plate 6. The lower end of the support plate 6 has a strong magnet 7. The support plate 6 and the strong magnet 7 are connected by a bolt 8.

[0050] Specifically, the strong magnet 7 is used to be adsorbed on the surface of the monitoring device. The lower end of the bolt 8 is connected with the threaded hole opened on the strong magnet 7. The bolt 8 is a ball head bolt. In this embodiment, the strong magnet 7 and the bolt 8 corresponding thereto have four, which are distributed at the four corners of the support plate 6.

[0051] Please continue to see the attached Figure 2 The first elastic member 9 is a cylindrical spring and is sleeved on the bolt 8.

[0052] Please continue to see the attached Figure 2 The support plate 6 and the waveguide rod 1 are connected by a screw 10.

[0053] Please continue to see the attached Figure 2 The waveguide rod for acoustic emission monitoring also includes a second cover 11. The second cover 11 is placed on the upper end of the support plate 6, and forms a space with the upper end face of the support plate 6. The waveguide rod 1 penetrates the second cover 11. The second cover 11 and the support plate 6 abut against each other with a second elastic member 12.

[0054] Specifically, the second cover 11 is made of a metal plate and has a square structure with a side wall and a top wall. The support plate 6 is also made of a metal material and is fixedly connected with the second cover 11.

[0055] The second elastic member 12 is a cylindrical spring and is sleeved on the waveguide rod 1.

[0056] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example" or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the exemplary description of the above terms does not necessarily mean the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0057] Although the embodiments of the present application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A waveguide rod for acoustic emission monitoring with automatic adjustment of modal filtering, characterized in that, The waveguide rod is connected with the piezoelectric probe through a wedge, and the wedge is connected with the waveguide rod at its lower end and with the piezoelectric probe at its upper end.

2. The waveguide rod for acoustic emission monitoring with automatic adjustment of the modal filter according to claim 1, characterized in that, The waveguide rod is provided with a taper structure at each end thereof, and the taper structure at each end of the waveguide rod forms an upper end plane and a lower end plane, respectively.

3. The waveguide rod for acoustic emission monitoring with automatic mode filter adjustment according to claim 2, characterized in that, The first cover is provided with a plate member hinged to the upper end plane, and the piezoelectric probe is arranged on the upper end of the plate member, and the wedge is arranged on the lower end of the piezoelectric probe.

4. The waveguide rod for acoustic emission monitoring with automatic modal filtering according to claim 3, characterized in that, The wedge is provided with a handle extending out of the first cover.

5. The waveguide rod for acoustic emission monitoring with automatic modal filtering according to claim 4, characterized in that, The waveguide rod is arranged through the support plate, and the support plate is provided with a strong magnet at its lower end.

6. A waveguide rod for acoustic emission monitoring with automatic modal filtering according to any one of claims 1 to 5, characterized in that, The support plate is further provided with a first elastic member abutting against the strong magnet.

7. The waveguide rod for acoustic emission monitoring with automatic modal filtering according to claim 6, characterized in that, The support plate is connected with the waveguide rod through a screw.

8. The waveguide rod for acoustic emission monitoring with automatic modal filtering according to claim 6, characterized in that, The second cover is arranged on the upper end of the support plate, and a space is formed between the upper end of the support plate and the second cover, and the waveguide rod is arranged through the second cover, and the second cover is provided with a second elastic member abutting against the support plate.

9. The waveguide rod for acoustic emission monitoring with automatic modal filtering according to claim 8, characterized in that, ​

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