Acoustic emission sensor

Abstract

The utility model discloses an acoustic emission sensor which comprises a cover body and a sensor body, and a vacuum suction nozzle communicated with the inside of the cover body is arranged on the cover body; the sensor body is installed in the cover body, and a sealing gasket is arranged on the edge of an opening of the cover body. And when the cover body is adsorbed on a test piece to be detected through vacuum pumping, the detection end of the sensor body abuts against the surface of the test piece to be detected. According to the utility model, the acoustic emission sensor can be quickly fixed on the test piece to be detected.

Description

Technical Field

[0001] The utility model relates to the technical field of sound wave detection, in particular to an acoustic emission sensor. Background Art

[0002] Acoustic emission refers to the phenomenon that when a material is deformed or fractured by external or internal forces, stress is concentrated in a local area of ​​the material, energy is released quickly and transient elastic waves are generated. Acoustic emission technology is a non-destructive testing technology. Its basic principle is to detect tiny stress changes inside the object to determine whether there are defects such as cracks, fatigue, and fractures. Acoustic emission technology is widely used in the quality inspection of concrete structures.

[0003] In order to collect clear and complete acoustic emission signals through the acoustic emission sensor, it is necessary to keep it close to the surface of the concrete structure. Therefore, the installation and fixation of the acoustic emission sensor is an important link. For the top surface and the side of the vertical wall, the existing acoustic emission sensors are mainly installed and fixed by winding with tape and gluing with glue. Among them, although the use of tape winding can fix the acoustic emission sensor on slender concrete specimens, the fixing effect is not ideal for concrete specimens with larger planes, and it is easy to fall off, or the probe of the acoustic emission sensor is in poor contact with the concrete surface; using glue to fix, although stable, but because of its strong viscosity, it can only be recovered by physical methods, and then chemical agents are used to remove the glue on the surface of the acoustic emission sensor, which is easy to damage the sensor.

[0004] Therefore, how to conveniently fix the acoustic emission sensor on the surface of the location to be tested is one of the problems to be solved urgently in the art. Utility Model Content

[0005] The utility model aims to provide an acoustic emission sensor to solve the deficiencies in the prior art. The utility model can quickly fix the acoustic emission sensor on a test piece to be detected and is easy to disassemble.

[0006] The utility model provides an acoustic emission sensor, comprising a cover body and a sensor body, wherein the cover body is provided with a vacuum nozzle connected to the inside of the cover body; the sensor body is installed in the cover body, and a sealing pad is provided at the opening edge of the cover body; when the cover body is adsorbed on a test piece to be detected by vacuuming, the detection end of the sensor body abuts against the surface of the test piece to be detected.

[0007] The acoustic emission sensor as described above, wherein, preferably, a first guide rod is provided in the cover body, and the center line of the first guide rod coincides with the center line of the cover body; the sensor body is slidably mounted on the first guide rod; an elastic member is sleeved on the first guide rod, one end of the elastic member is connected to the sensor body, and the other end is connected to the first guide rod.

[0008] In the acoustic emission sensor as described above, preferably, a first retaining ring is provided on the first guide rod, and one end of the elastic member away from the sensor body is connected to the first retaining ring.

[0009] The acoustic emission sensor as described above, wherein preferably, the vacuum nozzle includes a shell and a valve core, the shell passes through the cover body and is sealed with the cover body, a first exhaust hole is provided at one end of the shell located inside the cover body, and a second exhaust hole is provided at one end of the shell located outside the cover body; center lines of the first exhaust hole and the second exhaust hole are located on the same straight line; the valve core is slidably installed in the shell, a second guide rod is provided on the valve core, the second guide rod passes through the first exhaust hole, and the diameter of the second guide rod is smaller than the diameter of the first exhaust hole; the diameter of the valve core is larger than the diameter of the first exhaust hole.

[0010] In the acoustic emission sensor as described above, preferably, a limiting rod for limiting the valve core is further provided in the housing, and the limiting rod is arranged near the second exhaust hole.

[0011] As the acoustic emission sensor described above, preferably, the aperture of the second exhaust hole is smaller than the diameter of the valve core, and the limiting rod is arranged at the edge of the second exhaust hole.

[0012] In the acoustic emission sensor as described above, preferably, a handle is provided on a side of the valve core close to the second exhaust hole.

[0013] In the acoustic emission sensor as described above, preferably, a threading hole is opened on the cover body, and the signal line of the sensor body passes through the threading hole and is sealed and connected to the threading hole.

[0014] The acoustic emission sensor as described above, wherein preferably, the opening of the cover body is provided with a flange facing outwards.

[0015] The acoustic emission sensor as described above, wherein preferably, a handle is provided on the cover.

[0016] Compared with the prior art, the utility model has the following beneficial effects:

[0017] 1. The utility model has a simple structure and is easy to use. It can realize the rapid installation and fixation of the acoustic emission sensor to the test piece to be tested, and is easy to disassemble.

[0018] 2. The utility model sets a valve core in the vacuum nozzle so that the valve core and the first exhaust hole form a one-way valve. When the cover body is evacuated into a vacuum, the valve core seals the first exhaust hole to prevent external air from entering the cover body. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the acoustic emission sensor proposed by the utility model;

[0020] Figure 2 yes Figure 1 A cross-sectional view of

[0021] Figure 3 yes Figure 2 main view.

[0022] Description of reference numerals:

[0023] 1-cover body, 2-sensor body, 3-vacuum nozzle, 4-first guide rod, 5-elastic member, 6-first retaining ring, 31-shell, 32-valve core, 310-first exhaust hole, 311-second exhaust hole, 321-second guide rod, 7-limit rod, 8-handle, 9-signal line, 10-flange, 11-handle, 12-second retaining ring, 21-installation hole, 13-connecting tube, 14-sealing gasket. DETAILED DESCRIPTION

[0024] The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0025] Embodiment 1 of the present utility model:

[0026] like Figure 1 As shown, this embodiment proposes an acoustic emission sensor, including a cover body 1 and a sensor body 2, and the cover body 1 is hemispherical. The cover body 1 can also be other shapes such as a cylindrical tube structure, a conical tube structure, etc., and a sealing gasket 14 is provided on the opening edge of the cover body 1. A vacuum nozzle 3 connected to the inside of the cover body 1 is installed on the cover body 1, and the vacuum nozzle 3 can be connected to a vacuum pumping device. The air in the cover body 1 is extracted by the vacuum pumping device to generate a negative pressure in the cover body 1, so that the cover body 1 is adsorbed on the surface of the test piece to be tested. The vacuum pumping device can be a vacuum pump, a vacuum cylinder, etc. The sensor body 2 is installed in the cover body 1; when the cover body 1 is adsorbed on the test piece to be tested by vacuuming, the detection end of the sensor body 2 is against the surface of the test piece to be tested.

[0027] When in use, first apply a coupling agent such as vaseline to the detection end of the sensor body 2, then point the opening of the cover body 1 toward the test piece to be tested and abut against the surface of the test piece to be tested, then use a vacuum device to extract the air in the cover body 1 from the vacuum nozzle 3, so that the cover body 1 generates negative pressure, and under the action of the pressure difference between the inside and outside of the cover body 1, the cover body 1 is adsorbed on the test piece to be tested, and at the same time, the detection end of the sensor body installed in the cover body 1 abuts against the surface of the test piece to be tested, thereby completing the installation and fixation of the acoustic emission sensor on the test piece to be tested. In order to improve the sealing between the cover body 1 and the test piece to be tested, so that the cover body 1 is evacuated more quickly, and reduce the air entering the cover body 1 from the connection between the cover body 1 and the test piece to be tested, a coupling agent can also be applied at the connection between the cover body 1 and the test piece to be tested, specifically, vaseline can also be applied.

[0028] The cover 1 is provided with a threading hole, through which the signal line 9 of the sensor body 2 passes and is sealed and connected. As an implementation method, a sealing ring can be provided in the threading hole, through which the signal line 9 of the sensor body 2 passes.

[0029] See also Figure 2-Figure 3 As an implementation method, a first guide rod 4 is fixedly provided in the cover body 1, and the center line of the first guide rod 4 coincides with the center line of the cover body 1; the sensor body 2 is slidably mounted on the first guide rod 4; an elastic member 5 is sleeved on the first guide rod 4, one end of the elastic member 5 is connected to the sensor body 2, and the other end is connected to the first guide rod 4. In order to prevent the sensor body 2 from falling off the first guide rod 4, a second retaining ring 12 is provided at the end of the first guide rod 4. In a specific implementation, the sensor body 2 is provided with a mounting hole 21 along its axial direction, and one end of the first guide rod 4 is slidably mounted in the mounting hole 21. In order to facilitate the installation of the second retaining ring 12, as an implementation method, a nut can be threadedly connected to the end of the sensor body 2, the first guide rod 4 passes through the nut and slides with the nut, and one end of the elastic member 5 is connected to the nut. There is a gap at the connection between the first guide rod 4 and the nut. In a specific implementation, the elastic member 5 can be a coil spring or a rubber tube.

[0030] When no external force is applied, the sensor body 2 partially protrudes from the cover body 1 . When the sensor body 2 is subjected to a pressing force, it can move along the first guide rod 4 and press the elastic member 5 .

[0031] Specific description of the use process: When in use, first clean the detection area of ​​the surface of the component to be detected, apply coupling agent on the detection end of the sensor body 2 and the sealing gasket 14 of the opening of the cover body, then hold the cover body 1, make the opening of the cover body 1 face the test piece to be detected, and move toward the test piece to be detected. The detection end of the sensor body 2 first contacts the test piece to be detected, and apply pressure to the cover body 1 by hand to make the cover body 1 continue to move toward the test piece to be detected. The elastic member 5 is gradually compressed until the cover body 1 is buckled and pressed against the test piece. The pressure is continued to be maintained, and then the vacuum device is started to extract the air in the cover body 1 from the vacuum nozzle 3, so that the cover body 1 generates negative pressure. Under the action of the pressure difference between the inside and outside of the cover body 1, the cover body 1 is adsorbed on the test piece to be detected, and then the external force is removed to complete the installation and fixation of the acoustic emission sensor.

[0032] As an implementation method, a first retaining ring 6 is provided on the first guide rod 4 , and one end of the elastic member 5 away from the sensor body 2 is connected to the first retaining ring 6 . The first retaining ring 6 is designed to limit the elastic member 5 .

[0033] In order to increase the contact area between the cover body 1 and the test piece to be tested and improve the sealing performance, a flange 10 can be provided at the opening of the cover body 1. The flange 10 can be turned inward or outward, or both inward and outward. A sealing pad (14) is provided on the flange 10. The sealing pad 14 can be a rubber pad or a TPR (Thermo-plastic rubber) soft rubber pad. When a TPR soft rubber pad is used, better sealing performance can be achieved. The structure proposed in this embodiment can fix the sensor body 2 to the surface of the test piece to be tested on the principle that when a negative pressure is generated in the cover body 1, the pressure generated by the internal and external pressure difference can press the cover body 1 against the surface of the test piece to be tested, which further promotes the sealing of the sealing pad 14 and the surface of the test piece to be tested.

[0034] Embodiment 2 of the present utility model:

[0035] This embodiment is a further improvement on the basis of the first embodiment, and the same parts as the first embodiment are not repeated here, and only the improved points are described.

[0036] Please see Figure 2In this embodiment, the vacuum nozzle 3 includes a shell 31 and a valve core 32. The shell 31 passes through the housing 1 and is sealed with the housing 1. A first exhaust hole 310 is provided at one end of the shell 31 located inside the housing 1, and a second exhaust hole 311 is provided at one end of the shell 31 located outside the housing 1. The center lines of the first exhaust hole 310 and the second exhaust hole 311 are located on the same straight line, and the air in the housing 1 can be exhausted through the first exhaust hole 310 and the second exhaust hole 311. The valve core 32 is slidably installed in the shell 31. A second guide rod 321 is provided on the valve core 32. The second guide rod 321 passes through the first exhaust hole 310. The diameter of the second guide rod 321 is smaller than the diameter of the first exhaust hole 310. The diameter of the valve core 32 is larger than the diameter of the first exhaust hole 310. In order to improve the sealing performance of the valve core 32, a rubber pad can be provided on the side of the valve core 32 close to the first exhaust hole 310. In this way, after the vacuum device extracts the air in the cover body 1, the valve core 32 can better seal the first exhaust hole 310 under the effect of the internal and external pressure difference.

[0037] A limiting rod 7 for limiting the position of the valve core 32 is also provided in the housing 31, and the limiting rod 7 is arranged near the second exhaust hole 311. By providing the limiting rod 7, the valve core 32 can be limited to prevent the valve core 32 from blocking the second exhaust hole 311 under the suction of the vacuum device, so that a one-way valve is formed between the valve core 32 and the first exhaust hole 310. As an embodiment, the aperture of the second exhaust hole 311 is smaller than the diameter of the valve core 32, and the limiting rod 7 is arranged at the edge of the second exhaust hole 311. The limiting rod 7 can be provided in plurality, and the plurality of limiting rods 7 are evenly distributed along the circumferential direction of the second exhaust hole 311, so that the force on the valve core 32 can be more evenly applied.

[0038] In order to facilitate the connection between the vacuum extraction device and the vacuum nozzle 3 , the side of the second exhaust hole 311 away from the valve core 32 is connected to a connecting tube 13 .

[0039] See also Figure 3 In order to facilitate the removal of the acoustic emission sensor from the test piece after the test is completed, a handle 8 can be provided on the side of the valve core 32 close to the second exhaust hole 311. After the test is completed, the valve core 32 is moved toward the second exhaust hole 311 by pulling the handle 8, so that the outside air enters the cover body 1 through the second exhaust hole 311 and the first exhaust hole 310. When the pressure inside and outside the cover body 1 reaches the same, the cover body 1 can be easily removed from the test piece, thereby completing the removal of the acoustic emission sensor from the test piece. The disassembly process is simple and convenient. See Figure 1 In order to facilitate taking the cover body 1 , a cover handle 11 may be provided on the cover body 1 .

[0040] The air in the cover body mentioned in the present invention refers to the air in the sealed space enclosed by the cover body and the surface of the test piece after the cover body is buckled on the test piece.

[0041] It should be pointed out that the sensor body 2 referred to in the present application may be the same as the acoustic emission sensor in the prior art, or a cylindrical structure may be added to the end of the acoustic emission sensor in the prior art away from the detection end to form a mounting hole 21.

[0042] The above describes in detail the structure, features and effects of the utility model based on the embodiments shown in the drawings. The above is only a preferred embodiment of the utility model, but the utility model is not limited to the scope of implementation shown in the drawings. Any changes made in accordance with the concept of the utility model, or modifications to equivalent embodiments with equivalent changes, which still do not exceed the spirit covered by the description and the drawings, should be within the protection scope of the utility model.

Claims

1. An acoustic emission sensor, characterized in that: The invention comprises a cover body (1) and a sensor body (2); the cover body (1) is provided with a vacuum nozzle (3) which is connected to the inside of the cover body (1); the sensor body (2) is installed in the cover body (1); the opening edge of the cover body (1) is provided with a sealing gasket (14); when the cover body (1) is adsorbed on a test piece to be detected by vacuuming, the detection end of the sensor body (2) abuts against the surface of the test piece to be detected.

2. The acoustic emission sensor according to claim 1, characterized in that: A first guide rod (4) is provided inside the cover body (1), and the center line of the first guide rod (4) coincides with the center line of the cover body (1); the sensor body (2) is slidably mounted on the first guide rod (4); an elastic member (5) is sleeved on the first guide rod (4), and one end of the elastic member (5) is connected to the sensor body (2), and the other end is connected to the first guide rod (4).

3. The acoustic emission sensor according to claim 2, characterized in that: A first retaining ring (6) is provided on the first guide rod (4), and one end of the elastic member (5) away from the sensor body (2) is connected to the first retaining ring (6).

4. The acoustic emission sensor according to claim 2, characterized in that: The vacuum nozzle (3) comprises a shell (31) and a valve core (32); the shell (31) passes through the cover body (1) and is sealed with the cover body (1); a first exhaust hole (310) is provided at one end of the shell (31) located inside the cover body (1); a second exhaust hole (311) is provided at one end of the shell (31) located outside the cover body (1); center lines of the first exhaust hole (310) and the second exhaust hole (311) are located on the same straight line; the valve core (32) is slidably mounted in the shell (31); a second guide rod (321) is provided on the valve core (32); the second guide rod (321) passes through the first exhaust hole (310); the diameter of the second guide rod (321) is smaller than the diameter of the first exhaust hole (310); the diameter of the valve core (32) is larger than the diameter of the first exhaust hole (310).

5. The acoustic emission sensor according to claim 4, characterized in that: A limiting rod (7) for limiting the position of the valve core (32) is also provided in the housing (31), and the limiting rod (7) is arranged close to the second exhaust hole (311).

6. The acoustic emission sensor according to claim 5, characterized in that: The aperture of the second exhaust hole (311) is smaller than the diameter of the valve core (32), and the limiting rod (7) is arranged at the edge of the second exhaust hole (311).

7. The acoustic emission sensor according to claim 6, characterized in that: A handle (8) is provided on one side of the valve core (32) close to the second exhaust hole (311).

8. The acoustic emission sensor according to any one of claims 1 to 7, characterized in that: The cover body (1) is provided with a threading hole, and the signal line (9) of the sensor body (2) passes through the threading hole and is sealed and connected to the threading hole.

9. The acoustic emission sensor according to claim 8, characterized in that: The opening of the cover body (1) is provided with a flange (10) facing outwards.

10. The acoustic emission sensor according to claim 8, characterized in that: The cover body (1) is provided with a handle (11).

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