A wireless acoustic emission sensor

Abstract

This application discloses a wireless acoustic emission sensor, comprising: a housing with a receiving cavity, a drive circuit board disposed within the receiving cavity, the drive circuit board being used to convert electrical signals into acoustic emission signals, or to convert acoustic emission signals into electrical signals; a base, the upper end of the base being disposed at the lower end of the housing; a magnet and a fixing seat disposed at the lower end of the base, the upper end of the fixing seat extending into a mounting cavity, and a piezoelectric ceramic disposed at the lower end of the fixing seat; the mounting cavity having an elastic element and leads, the drive circuit board and the piezoelectric ceramic being electrically connected via the leads, and the two ends of the elastic element respectively abutting against the fixing seat and the lower end of the housing. In this embodiment, by integrating the drive circuit board inside the housing and integrating the piezoelectric ceramic at the bottom of the housing via the fixing seat and the base, an integrated acoustic emission sensor is formed, facilitating user operation. When the object to be detected is magnetic, the entire wireless acoustic emission sensor is attracted to the object using the magnet on the base, facilitating installation.

Description

Technical Field

[0001] This application relates to the field of acoustic emission sensors, and more particularly to a wireless acoustic emission sensor. Background Technology

[0002] Most current acoustic emission sensor devices consist of a sensor, a coaxial cable, and an amplifier. The sensor is placed on the object to be detected, and the coaxial cable connects the sensor and the amplifier to receive the acoustic emission signal detected by the sensor. Because the sensor, coaxial cable, and amplifier are separate components, this type of acoustic emission sensor is inconvenient for users.

[0003] The above content is only used to help understand the technical solution of this application and does not represent an admission that the above content is prior art. Utility Model Content

[0004] The main objective of this application is to provide a wireless acoustic emission sensor that addresses the inconvenience of using split-type sensors in the prior art.

[0005] To achieve the above objectives, this application provides an acoustic emission sensor, comprising:

[0006] The housing has a receiving cavity, and a driving circuit board is provided inside the receiving cavity. The driving circuit board is used to convert electrical signals into acoustic emission signals, or to convert acoustic emission signals into electrical signals.

[0007] A base is located at the lower end of the housing. The base has a mounting cavity with a first opening and a second opening at one end near the housing and the other end away from the housing, respectively. A lead wire hole is provided at the lower end of the housing, communicating with the first opening. A fixing seat is provided at the end of the base away from the housing, with one end near the housing located at the second opening and the other end away from the housing containing a piezoelectric element. A magnetic body is also provided at the end of the base away from the housing.

[0008] The mounting cavity is provided with an elastic element and a lead wire. The drive circuit board and the piezoelectric element are electrically connected through the lead wire. The two ends of the elastic element abut against the lower end of the fixing base and the housing, respectively.

[0009] In this embodiment of the application, the outer side wall of the fixed seat near the housing is provided with a first limiting ring, the inner side wall of the second opening is provided with a second limiting ring, the first limiting ring is disposed in the mounting cavity and is engaged with the second limiting ring, and the end of the fixed seat away from the housing extends from the second opening to the outside of the mounting cavity.

[0010] In this embodiment, the base has a first groove and a second groove at the end away from the housing. The first groove and the second groove are symmetrically arranged along the fixed seat, and both the first groove and the second groove are used to install the magnetic body.

[0011] In this embodiment, the fixing base is hollow, and the inner sidewall at the lower end of the fixing base is provided with an annular step. The annular step is provided with an annular groove. The piezoelectric element is disposed on the annular step, and the annular protrusion on the piezoelectric element is adapted to the annular groove.

[0012] In this embodiment of the application, the upper end of the housing is provided with a third opening communicating with the accommodating cavity, and the housing also includes a top cover, which covers the third opening and is detachably connected to the housing.

[0013] In this embodiment of the application, the accommodating cavity is further provided with a fixing plate, which divides the accommodating cavity into a first accommodating area and a second accommodating area. The first accommodating area is located above the second accommodating area, and the driving circuit board is disposed in the second accommodating area. The first accommodating area is provided with a power supply, and the power supply is electrically connected to the driving circuit board.

[0014] In this embodiment, a power interface is also provided on the outer wall of the housing, and the power interface is electrically connected to the drive circuit board.

[0015] In this embodiment of the application, a signal connector is also provided on the outer side of the housing, and the signal connector is electrically connected to the drive circuit board.

[0016] In this embodiment of the application, the wireless acoustic emission sensor further includes a protective sheet, which is disposed on the outside of the piezoelectric element.

[0017] In this embodiment, a drive circuit board is integrated inside the housing, and the piezoelectric element is integrated at the bottom of the housing via a mounting base and a base, thereby forming an integrated acoustic emission sensor for user convenience. In addition, a magnet is provided at the end of the base away from the housing. When the object to be detected is magnetic, the entire wireless acoustic emission sensor can be attracted to the object to be detected by the magnet on the base, which is convenient for installation. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a wireless acoustic emission sensor according to an embodiment of this application;

[0019] Figure 2 This is a cross-sectional view of a wireless acoustic emission sensor according to an embodiment of this application;

[0020] Figure 3This is a partial enlarged view of the mounting base of a wireless acoustic emission sensor according to an embodiment of this application.

[0021] Icon labels:

[0022] 100-Housing, 110-Accommodation cavity, 111-First accommodation area, 112-Second accommodation area, 120-Top cover, 130-Battery, 140-Fixing plate, 150-Drive circuit board, 160-Lead hole, 170-Signal connector, 200-Base, 210-First opening, 220-Second opening, 230-Mounting cavity, 240-Second limiting ring, 250-First magnet, 251-First groove, 260-Second magnet, 261-Second groove, 270-Mounting cavity, 300-Fixing seat, 310-First limiting ring, 320-Annular step, 330-Annular groove, 340-Protective sheet, 350-Piezoelectric element, 400-Elastic element. Detailed Implementation

[0023] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0024] It should be noted that if the embodiments of this application involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0025] Furthermore, if the embodiments of this application involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0026] like Figure 1 , Figure 2 and Figure 3 As shown, this exemplary embodiment proposes a wireless acoustic emission sensor, including:

[0027] The housing 100 has a receiving cavity 110; the receiving cavity 110 has a driving circuit board 150; the driving circuit board 150 is used to convert electrical signals into acoustic emission signals, or to convert acoustic emission signals into electrical signals.

[0028] A base 200 is disposed at the lower end of the housing 100. The base 200 has a mounting cavity 230, with a first opening 210 and a second opening 220 at one end of the base 200 near the housing 100 and the other end away from the housing 100, respectively. A lead wire hole 160 is provided at the lower end of the housing 100, communicating with the first opening 210. A fixing seat 300 is provided at the end of the base 200 away from the housing 100, with one end of the fixing seat 300 near the housing 100 located at the second opening 220, and a piezoelectric element 350 is provided at the other end away from the housing 100. A magnetic body is also provided at the other end of the base 200 away from the housing 100.

[0029] The mounting cavity 230 is provided with an elastic element 400 and a lead wire. The drive circuit board 150 and the piezoelectric element 350 are electrically connected through the lead wire. The two ends of the elastic element 400 abut against the lower end of the fixing base 300 and the housing 100, respectively.

[0030] like Figure 1 , Figure 2 As shown in this embodiment, the housing 100 is generally rectangular in shape, with a hollow interior forming a cavity 110. The drive circuit board 150 can convert electrical signals into acoustic emission signals via the piezoelectric element 350 and transmit them to the object to be detected. The drive circuit can also receive the electrical signals converted by the piezoelectric element 350. For example, in this embodiment, an electrical component for transmitting acoustic emission signals and an electrical component for receiving electrical signals can be integrated on the drive circuit board 150, thereby obtaining a wireless acoustic emission sensor that simultaneously has the functions of transmitting and receiving acoustic emission signals. Of course, in other embodiments, only an electrical component for transmitting acoustic emission signals or an electrical component for receiving electrical signals can be integrated on the drive circuit board 150. In this case, the wireless acoustic emission sensor only has the function of transmitting or receiving acoustic emission signals. It should be noted that the piezoelectric element can be piezoelectric ceramic or other transducer components that can convert mechanical energy into electrical energy.

[0031] like Figure 2 As shown in this embodiment, a circuit board mounting hole can be reserved at the bottom of the housing 100, and the circuit board can be installed at the bottom of the accommodating cavity 110 by screws.

[0032] Continue to refer to Figure 2In this embodiment of the application, the lower end of the housing 100 is also provided with a lead hole 160, which is used for the lead wires of the power supply connection drive circuit board 150 and the piezoelectric element 350 to pass through.

[0033] like Figure 1 , Figure 2 As shown in the embodiment of this application, the base 200 is disposed at the lower end of the housing 100. The base 200 is also roughly rectangular in shape. The area of ​​the upper end of the base 200 can be greater than the area of ​​the lower end of the housing 100, or smaller than the area of ​​the lower end of the housing 100, or the same as the area of ​​the lower end of the housing 100. The technical solution of this application does not limit the size of the housing 100 and the mounting base.

[0034] In this embodiment, the area of ​​the upper end of the base 200 is smaller than the area of ​​the lower end of the housing 100. The base 200 is provided with a mounting cavity 230. The first opening 210 of the mounting cavity 230 is located at the upper end of the base 200, and the second opening 220 is located at the lower end of the base 200. After the base 200 is installed at the lower end of the housing 100, the lead hole 160 is located inside the first opening 210 on the plane where the upper end of the base 200 contacts the lower end of the housing 100. This facilitates the lead wire to pass through the lead hole 160 on the housing 100, enter the mounting cavity 230 through the first opening 210, and then be electrically connected to the piezoelectric element 350.

[0035] Continue to refer to, for example Figure 2 In this embodiment, the outer side wall of the fixing base 300 near the housing 100 is provided with a first limiting ring 310, and the inner side wall of the second opening 220 is provided with a second limiting ring 240. The first limiting ring 310 is disposed in the mounting cavity 230 and engages with the second limiting ring 240. The end of the fixing base 300 away from the housing 100 extends from the second opening 220 to the outside of the mounting cavity 230. Figure 1 and Figure 2 As shown, the fixing base 300 is generally a hollow cylinder. A first limiting ring 310 is provided on the outer wall of the upper end of the fixing base 300, protruding outward from the outer wall of the upper end of the fixing base 300. A second limiting ring 240 protrudes inward from the inner wall of the second opening 220. The outer diameter of the portion of the fixing base 300 downward from the first limiting ring 310 is approximately the same as or slightly smaller than the inner diameter of the second opening 220. During installation, the lower end of the fixing base 300 protrudes through the second opening 220, and the first limiting ring 310 and the second limiting ring 240 engage, thereby preventing the fixing base 300 from falling out of the second opening 220.

[0036] Continue to refer to Figure 2In this embodiment, the elastic element 400 can be a single spring or a group of springs. Taking a single spring as an example, a spring with a diameter approximately the same as the diameter of the first limiting ring 310 can be selected. The spring is coaxially arranged with the first limiting ring 310, with one end abutting against the first limiting ring 310 and the other end abutting against the lower end of the housing 100. When the elastic element 400 is a group of multiple springs, the multiple springs can be evenly distributed circumferentially on the upper surface of the first limiting ring 310.

[0037] In addition, in one embodiment of this application, the length of the spring can be selected so that when the spring is in a free state, both ends of the spring just abut against the lower end of the housing 100 and the first limiting ring 310. At this time, the fixing seat 300 is just locked onto the second limiting ring 240. That is, when the wireless acoustic emission sensor is not in use, the spring is not compressed. When in use, the piezoelectric element 350 at the end of the fixing seat 300 away from the housing contacts the object being detected and is subjected to force. At this time, the spring is compressed, thereby supporting the piezoelectric element 350 to be in close contact with the object being detected.

[0038] In other embodiments, the length of the spring can be selected such that when the wireless acoustic emission sensor is not in use, both ends of the spring abut against the lower end of the housing 100 and the first limiting ring 310 respectively, and the spring is in a compressed state. At this time, the fixing seat 300 is supported and locked onto the second limiting ring 240 by the spring. When in use, the piezoelectric element 350 at the end of the fixing seat 300 away from the housing contacts the object being detected and is subjected to force, and the spring is further compressed, thereby further supporting the piezoelectric element 350 to be in close contact with the object being detected.

[0039] like Figure 1 and Figure 2 As shown in this embodiment, a magnetic body is provided at the lower end of the base 200. The magnetic body is located at the bottom of the base 200, and the piezoelectric element 350 is located at the bottom of the fixing base 300 and protrudes from the magnetic body 250. In use, the piezoelectric element 350 is in contact with the object to be detected, and the magnetic body is at a certain distance from the object to be detected. When the object to be detected is magnetic, a slight pressure is applied downward along the upper end of the housing 100, and the elastic element 400 is further compressed, so that the piezoelectric element 350 can make close contact with the object to be detected. At the same time, the magnetic body 250 and the magnetic object to be detected attract each other, so that not only can the entire wireless acoustic emission sensor be installed on the object to be detected, but also good contact between the piezoelectric element 350 and the object to be detected can be ensured. In addition, the magnetic body can be a magnetic material, such as a magnet, and its shape and number are not limited in this application.

[0040] like Figure 1 , Figure 2As shown in this embodiment, the base 200 has a first groove 2561 and a second groove 261 at the end away from the housing 100. The first groove 251 and the second groove 261 are symmetrically arranged along the fixing seat 300, and both the first groove 251 and the second groove 261 are used to install the magnetic body. The first groove 251 and the second groove 261 are symmetrically arranged on the left and right sides of the lower end of the base 200. The depth of the first groove 251 and the second groove 261 is slightly less than the longitudinal height of the first magnetic body 250 and the second magnetic body 260, so that after the magnetic body is installed in the groove, a section protrudes outside the groove, thus facilitating magnetic attraction with the object to be detected. The first groove 251 is used to install the first magnetic body 250, and the second groove 261 is used to install the second magnetic body 260. The exposed lengths of the first magnetic body 250 and the second magnetic body 260 are consistent, that is, the lower ends of the two magnetic bodies are located on the same horizontal plane, ensuring that the left and right sides are stably attracted to the object to be detected.

[0041] Furthermore, the base 200, the magnet 250, and the housing 100 can be fixedly connected in various ways, such as by adhesive bonding and threaded connection. For example, in one embodiment of this application, the base 200 can be adhesively bonded to the lower end of the housing 100, the first magnet 250 can be adhesively bonded to the first groove 251, and the second magnet 260 can be adhesively bonded to the second groove 261. In another embodiment, corresponding threaded holes can be provided at the bottom of the first magnet 250 and the first groove 251, the bottom of the second magnet 260 and the second groove 261, and the lower end of the housing 100, respectively, to thread the first magnet 250, the second magnet 260, and the base 200 to the lower end of the housing 100.

[0042] like Figure 2 , Figure 3 As shown in this embodiment, the mounting base 300 is hollow, and the inner sidewall of the lower end of the mounting base 300 is provided with an annular step 320. The annular step 320 is provided with an annular groove 330. The piezoelectric element 350 is disposed on the annular step 320, and the annular protrusion on the piezoelectric element 350 is adapted to the annular groove 330. The hollow nature of the mounting base 300 facilitates the lead wire to pass through the mounting cavity 230 and electrically connect to the piezoelectric element 350 at the lower end of the mounting base 300. Furthermore, the inner diameter of the annular step 320 is smaller than the outer diameter of the piezoelectric element 350, and the annular groove 330 faces the upper end of the mounting base 300. During installation, the piezoelectric element 350 is installed on the annular step 320 from the lower opening of the mounting base 300, and the annular protrusion on the piezoelectric element 350 is aligned with the annular groove 330 to ensure a stable installation. When the piezoelectric element 350 is damaged, it can be directly removed from the lower end of the mounting base 300 for replacement, which is convenient for operation.

[0043] like Figure 1 , Figure 2 As shown in this embodiment, the upper end of the housing 100 is provided with a third opening communicating with the accommodating cavity 110. The housing 100 also includes a top cover 120, which covers the third opening and is detachably connected to the housing 100. The top cover 120 is provided at the third opening of the housing 100, and the top cover 120 and the housing 100 form a detachable structure, such as a threaded connection or a snap-fit ​​connection. When the drive circuit board 150 inside the accommodating cavity 110 malfunctions, the top cover 120 can be opened for easy maintenance.

[0044] In another embodiment, a power connector may be provided on the outer wall of the housing 100 for connecting an external power source to power the drive circuit board 150.

[0045] like Figure 1 As shown in this embodiment, a signal connector 170 is also provided on the outer wall of the housing 100, and the signal connector 170 is electrically connected to the drive circuit board 150. During testing, the signal received by the drive circuit board 150 can be output to devices such as a computer or oscilloscope through the signal connector 170 to facilitate the analysis of the received acoustic emission signal.

[0046] like Figure 2 As shown in the embodiment of this application, the accommodating cavity 110 is further provided with a fixing plate 140, which divides the accommodating cavity 110 into a first accommodating area 111 and a second accommodating area 112. The first accommodating area 111 is located above the second accommodating area 112, and the driving circuit board 150 is disposed in the second accommodating area 112. The first accommodating area 111 is provided with a power supply, which is electrically connected to the driving circuit board 150. Figure 2 As shown, the fixing plate 140 can be screwed into the accommodating cavity 110. The first accommodating area 111 above it can hold a power source, such as a battery 130. The second accommodating area 112 below it can be used to mount the drive circuit board 150. With the battery 130 housed within the housing 100, testing can be performed without an external power source. Furthermore, after prolonged operation, the battery 130 generates a significant amount of heat. Dividing the accommodating cavity 110 into the first accommodating area 111 and the second accommodating area 112 by the fixing plate 140 prevents the drive circuit board 150 from being affected by excessively high battery temperatures. In other embodiments, heat-insulating material can also be laid on the fixing plate 140 to further enhance the heat insulation effect.

[0047] like Figure 2 , Figure 3As shown in this embodiment, the wireless acoustic emission sensor further includes a protective sheet 340, which is disposed on the outside of the piezoelectric element 350. The protective sheet 340 can be circular, with a diameter matching that of the piezoelectric element 350. It is positioned at the opening at the lower end of the mounting base 300 and on the outside of the piezoelectric element 350, thereby providing protection for the piezoelectric element 350. Furthermore, the protective sheet 340 can be made of materials such as ceramic, which facilitate the transmission of acoustic emission signals.

[0048] In this embodiment, a drive circuit board 150 is integrated inside the housing 100, and a piezoelectric element 350 is integrated at the bottom of the housing 100 via a fixing base 300 and a base 200, thereby forming an integrated acoustic emission sensor for user convenience. In addition, a magnet 250 is provided at the end of the base 200 away from the housing 100. When the object to be detected is magnetic, the entire wireless acoustic emission sensor can be attracted to the object to be detected by the magnet 250 on the base 200, which is convenient for installation.

[0049] Finally, it should be noted that the above embodiments are merely specific implementations of this application, used to illustrate the technical solutions of this application, and not to limit them. The protection scope of this application is not limited thereto. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features, within the technical scope disclosed in this application. Such modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be covered within the protection scope of this application. Therefore, the protection scope of this application should be determined by the protection scope of the claims.

Claims

1. A wireless acoustic emission sensor, characterized in that, include: The housing has a receiving cavity, and a driving circuit board is provided inside the receiving cavity. The driving circuit board is used to convert electrical signals into acoustic emission signals, or to convert acoustic emission signals into electrical signals. A base is located at the lower end of the housing. The base has a mounting cavity with a first opening and a second opening at one end near the housing and the other end away from the housing, respectively. A lead wire hole is provided at the lower end of the housing, communicating with the first opening. A fixing seat is provided at the end of the base away from the housing, with one end near the housing located at the second opening and the other end away from the housing containing a piezoelectric element. A magnetic body is also provided at the end of the base away from the housing. The mounting cavity is provided with an elastic element and a lead wire. The drive circuit board and the piezoelectric element are electrically connected through the lead wire. The two ends of the elastic element abut against the lower end of the fixing base and the housing, respectively.

2. The wireless acoustic emission sensor as described in claim 1, characterized in that, The outer side wall of the fixed seat near the housing is provided with a first limiting ring, and the inner side wall of the second opening is provided with a second limiting ring. The first limiting ring is located in the mounting cavity and is engaged with the second limiting ring. The end of the fixed seat away from the housing extends from the second opening to the outside of the mounting cavity.

3. The wireless acoustic emission sensor as described in claim 1, characterized in that, The base has a first groove and a second groove at the end away from the housing. The first groove and the second groove are symmetrically arranged along the fixed seat. Both the first groove and the second groove are used to install the magnetic body.

4. The wireless acoustic emission sensor as described in claim 1, characterized in that, The fixing base is hollow, and the inner sidewall at the lower end of the fixing base is provided with an annular step. The annular step is provided with an annular groove. The piezoelectric element is disposed on the annular step, and the annular protrusion on the piezoelectric element is adapted to the annular groove.

5. The wireless acoustic emission sensor as described in claim 1, characterized in that, The upper end of the housing is provided with a third opening that communicates with the accommodating cavity. The housing also includes a top cover that covers the third opening and is detachably connected to the housing.

6. The wireless acoustic emission sensor as described in claim 1, characterized in that, The accommodating cavity is further provided with a fixing plate, which divides the accommodating cavity into a first accommodating area and a second accommodating area. The first accommodating area is located above the second accommodating area. The driving circuit board is located in the second accommodating area. The first accommodating area is provided with a power supply, which is electrically connected to the driving circuit board.

7. The wireless acoustic emission sensor as described in claim 1, characterized in that, A power interface is also provided on the outer wall of the housing, and the power interface is electrically connected to the drive circuit board.

8. The wireless acoustic emission sensor as described in claim 1, characterized in that, The outer side of the housing is also provided with a signal connector, which is electrically connected to the drive circuit board.

9. The wireless acoustic emission sensor as described in claim 1, characterized in that, The wireless acoustic emission sensor also includes a protective sheet, which is disposed on the outside of the piezoelectric element.

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