Sensor for structural sound test
By combining a split housing assembly with an elastic buffer preload, the problems of poor sensor impact resistance and sensitivity to vibration interference are solved, achieving higher durability and signal accuracy.
Patent Information
- Application Number
- CN202520403474.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-10
- Publication Date
- 2026-01-06
- Estimated Expiration
- 2035-03-10
AI Technical Summary
Existing structural acoustic sensors have poor impact resistance during detection, are easily damaged, and lack effective vibration damping design, resulting in vibration noise being coupled into the detection signal.
The device employs a split housing assembly, including a front housing, an elastic buffer, and a detection head assembly between the rear housing and the elastic buffer. The detection head assembly between the elastic buffer and the rear housing, through the combination of the elastic buffer and the elastic preload, absorbs impact energy and provides axial preload, thereby achieving vibration reduction and electrical isolation.
This improves the sensor's shock resistance and electrical isolation capabilities, reduces the impact of mechanical vibration on the signal, and enhances the sensor's durability and signal accuracy.
Smart Images
Figure CN223769631U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the technical field of structural sound test, especially relates to a sensor for structural sound test. BACKGROUND
[0002] At present, the object needs to carry out the structural sound off-line detection in the production line, usually adopts the structural sound sensor to test the structural sound of the object, but the existing structural sound sensor usually adopts the metal shell to directly contact the measured object, and the following disadvantages exist: poor impact resistance: the shell and the mounting surface are rigidly connected, when the test end directly contacts the object, mechanical impact easily leads to internal element damage; vibration interference sensitive: lacking effective shock absorption design, environmental vibration noise is easily coupled into the detection signal. UTILITY MODEL CONTENT
[0003] The utility model aims at providing a kind of sensor for structural sound test, to solve one or more technical problems existing in prior art, at least provide a kind of beneficial selection or create conditions.
[0004] To solve the technical problems of the above technical solutions:
[0005] The utility model provides a kind of sensor for structural sound test, comprising:
[0006] Housing assembly, including the front end shell, elastic buffer and rear end shell connected in sequence;
[0007] Detection head assembly, slidingly installed in the front end shell;
[0008] Buffer pre-tightening assembly, including elastic pre-tightening piece, the elastic pre-tightening piece acts between the detection head assembly and the rear end shell, and the elastic pre-tightening piece is used to provide the pre-tightening elastic force of detection head assembly to front.
[0009] The utility model discloses a kind of sensor for structural sound test, which has the following beneficial effects:
[0010] The utility model sets up housing assembly into split type structure, sets up elastic buffer between front end shell and rear end shell, when detecting, the rear end shell is fixed, and the detection head assembly is in contact with the measured object, at this time, the impact energy between front end shell and rear end shell is absorbed by elastic buffer, and the axial pre-tightening force of detection head assembly is provided by elastic pre-tightening piece, in order to make detection head assembly keep in contact with the measured object, the impact energy between detection head assembly and rear end shell is absorbed, the utility model is absorbed by elastic buffer and elastic pre-tightening piece cooperatively impact energy, can withstand larger instantaneous impact without structural damage.
[0011] As a further improvement of the above technical solution, the front end shell, the elastic buffer and the rear end shell are all hollow sleeve structures, the interiors of the front end shell, the elastic buffer and the rear end shell are communicated with each other, the rear end shell is connected with a connector, and a communication wire is connected between the detection head assembly and the connector.
[0012] As a further improvement of the above technical solution, the elastic buffer is a rubber sleeve structure, and two ends of the rubber sleeve structure are connected to the front end shell and the rear end shell respectively.
[0013] As a further improvement of the above technical solution, the two ends of the rubber sleeve structure are sleeved on the outer periphery of the front end shell and the rear end shell respectively, an inner peripheral wall of the rubber sleeve structure is provided with a buffer convex ring, the buffer convex ring is clamped between the end faces of the front end shell and the rear end shell, the outer periphery of the front end shell is provided with a front convex ring abutting against the front end of the rubber sleeve structure, and the outer periphery of the rear end shell is provided with a rear convex ring abutting against the rear end of the rubber sleeve structure.
[0014] As a further improvement of the above technical solution, the detection head assembly comprises a head sleeve sleeved in the front end shell in a front-rear sliding mode and a detection unit installed in the head sleeve, a rear end of the head sleeve abuts against the elastic pre-tightening piece, and the detection unit is connected with the connector through the communication wire.
[0015] As a further improvement of the above technical solution, the detection head assembly further comprises a detection tip, the detection tip is installed at a front end of the detection unit and extends out of the head sleeve.
[0016] As a further improvement of the above technical solution, an inner peripheral wall of the front end shell is provided with a snap spring, and the snap spring abuts against a front end of the head sleeve.
[0017] As a further improvement of the above technical solution, a tail sleeve is sleeved in the interior of the rear end shell, the connector is installed in the tail sleeve, and the elastic pre-tightening piece is arranged between the tail sleeve and the head sleeve.
[0018] As a further improvement of the above technical solution, the elastic pre-tightening piece is a spring structure, and nylon washers are arranged at two ends of the spring structure respectively.
[0019] As a further improvement of the above technical solution, the tail sleeve is provided with an oil stain discharge hole, and the head sleeve is provided with a clamping groove matched with the nylon washer.
[0020] Other features and advantages of the present application will be described in the following description and become apparent from the description, or can be learned from the practice of the present application. BRIEF DESCRIPTION OF DRAWINGS
[0021] The utility model will be further explained in connection with the drawings and embodiments;
[0022] Figure 1 It is the sensor for structural sound test provided by the utility model, structural schematic diagram of one embodiment thereof;
[0023] Figure 2 It is the sensor for structural sound test provided by the utility model, sectional view of one embodiment thereof;
[0024] Reference Signs:
[0025] Housing assembly 100; front end shell 110; front convex ring 111; snap spring 112; elastic buffer 120; buffer convex ring 121; rear end shell 130; rear convex ring 131; tail sleeve 132; oil stain discharge hole 133; connector 134;
[0026] Detection head assembly 200; head sleeve 210; clamping groove 211; detection unit 220; detection tip 230;
[0027] Buffer pre-tightening assembly 300; elastic pre-tightening piece 310; nylon washer 320. DETAILED DESCRIPTION
[0028] The embodiments of the utility model will be described in detail below, the examples of the embodiments are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary, only for explaining the utility model, and cannot be understood as limiting the utility model.
[0029] In the description of the utility model, it is understood that the orientation description, such as the orientation or position relationship of the indication of up and down, is based on the orientation or position relationship shown in the drawings, only for the convenience of describing the utility model and simplifying the description, and is not indicative or implied that the indicated device or element must have a specific orientation, a specific orientation and operation, therefore, it cannot be understood as limiting the utility model.
[0030] In the description of the utility model, multiple means more than two. If there is a description to the first, the second is only used for distinguishing the technical features for the purpose, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the indicated technical features.
[0031] In the description of the utility model, unless otherwise explicitly limited, the words such as setting, installing, connecting should be understood broadly, and the specific meaning of the above words in the utility model can be determined by the person skilled in the art in combination with the specific content of the technical scheme.
[0032] The technical scheme of the utility model will be described clearly and completely in combination with the drawings, and obviously, the following described embodiments are part of the embodiments of the utility model, not all the embodiments.
[0033] The existing structure acoustic sensor usually adopts metal shell to directly contact the measured object, and has the following disadvantages:
[0034] Poor impact resistance: the sensor shell is rigidly connected with the mounting surface, and mechanical impact can easily cause damage to the internal components;
[0035] Insufficient electrical isolation: the metal shell is easy to form potential coupling under high voltage environment, which affects the signal accuracy;
[0036] Sensitive to vibration interference: lacking effective shock absorption design, environmental vibration noise is easy to be coupled into the detection signal.
[0037] The utility model proposes a sensor for structural sound testing aiming at the above problems, which can realize the effects of isolation and shock absorption.
[0038] As shown in Figure 1 and Figure 2 The structural sound testing sensor of the utility model comprises a shell assembly 100, a detection head assembly 200 and a buffer pre-tightening assembly 300.
[0039] The shell assembly 100 of the embodiment is a split type sealed shell, specifically, the shell assembly 100 of the embodiment comprises a front end shell 110, an elastic buffer 120 and a rear end shell 130, the front end shell 110, the elastic buffer 120 and the rear end shell 130 are connected in sequence along the front-rear direction, and the front end shell 110 and the rear end shell 130 are both made of aluminum alloy material.
[0040] The detection head assembly 200 is slidingly installed in the front end shell 110, and the detection head assembly 200 is used to contact the measured object to realize off-line detection, specifically, the detection head assembly 200 of the embodiment is slidingly installed in the front end shell 110.
[0041] The buffer pre-tightening assembly 300 comprises an elastic pre-tightening piece 310, the elastic pre-tightening piece 310 acts between the detection head assembly 200 and the rear end shell 130, and the elastic pre-tightening piece 310 is used to provide the detection head assembly 200 with forward pre-tightening elastic force.
[0042] When detecting, the rear end shell 130 is fixed, the detection head assembly 200 is in contact with the detected object, at this time, the impact energy between the front end shell 110 and the rear end shell 130 is absorbed by the elastic buffer 120, and the forward axial pre-tightening force of the detection head assembly 200 is provided by the elastic pre-tightening member 310, so that the detection head assembly 200 can be kept in contact with the detected object and the impact energy between the detection head assembly 200 and the rear end shell 130 can be absorbed, and the elastic buffer 120 and the elastic pre-tightening member 310 can cooperate to absorb the impact energy, so that the structure can withstand a large instantaneous impact without damage.
[0043] Further, the front end shell 110, the elastic buffer 120 and the rear end shell 130 of the embodiment are all hollow sleeve structures, the interiors of the front end shell 110, the elastic buffer 120 and the rear end shell 130 are communicated with each other to form an axial cavity, the detection head assembly 200 can slide forward and backward in the axial cavity, the connector 134 is connected to the rear end shell 130, and the communication wire is connected between the detection head assembly 200 and the connector 134, the TNC interface RG58 coaxial cable (mechanical vibration resistance level ≥10g) or the M9 oil immersion compatible interface is selected for the communication wire and the connector 134, and the cable bending radius is ≥50mm, so that signal attenuation is prevented.
[0044] The elastic buffer 120 of the embodiment is a rubber sleeve structure, the two ends of the rubber sleeve structure are connected to the front end shell 110 and the rear end shell 130 respectively, and the rubber sleeve structure has the insulation property, so that the electrical isolation between the front end shell 110 and the rear end shell 130 is realized.
[0045] The two ends of the rubber sleeve structure are sleeved on the outer periphery of the front end shell 110 and the rear end shell 130 respectively, the inner peripheral wall of the rubber sleeve structure is provided with the buffer convex ring 121, the buffer convex ring 121 is clamped between the end faces of the front end shell 110 and the rear end shell 130, the outer periphery of the front end shell 110 is provided with the front convex ring 111 abutting against the front end of the rubber sleeve structure, the outer periphery of the rear end shell 130 is provided with the rear convex ring 131 abutting against the rear end of the rubber sleeve structure, in the axial direction, the end portions of the front end shell 110 and the rear end shell 130 are separated by the buffer convex ring 121, and the two ends of the rubber sleeve structure are clamped by the front convex ring 111 and the rear convex ring 131, so that the vibration isolation effect between the front end shell 110 and the rear end shell 130 is improved, and the anti-breaking capacity between the front end shell 110 and the rear end shell 130 is also improved.
[0046] As Figure 2As shown, the detection head assembly 200 of the embodiment comprises a head sleeve 210 slidingly sleeved in the front end shell 110, and a detection unit 220 installed in the head sleeve 210, wherein the detection unit 220 is a piezoelectric ceramic accelerometer, and the piezoelectric ceramic accelerometer is sealed and fixed with the head sleeve 210 by pouring elastic glue therebetween.
[0047] The rear end of the head sleeve 210 of the embodiment abuts against the elastic pre-tightening member 310, and the detection unit 220 is connected with the connector 134 through communication wires.
[0048] The inner peripheral wall of the front end shell 110 of the embodiment is provided with a snap spring 112, the snap spring 112 abuts against the front end of the head sleeve 210, and the head sleeve 210 is limited by the snap spring 112, in the natural state, the elastic pre-tightening member 310 makes the head sleeve 210 abut against the snap spring 112, and the elastic pre-tightening member 310 is compressed when the head sleeve 210 is moved backward under external force.
[0049] Further, the detection head assembly 200 further comprises a detection tip 230, the detection tip 230 is installed at the front end of the detection unit 220 and extends out of the head sleeve 210, in the detection, the detection tip 230 contacts with the measured object, the detection tip 230 of the embodiment is screw-connected to the front end of the detection unit 220, and different detection tips 230 can be replaced according to different detection requirements.
[0050] The rear end shell 130 of the embodiment is internally sleeved with a tail sleeve 132, the connector 134 is installed in the tail sleeve 132, and the elastic pre-tightening member 310 is arranged between the tail sleeve 132 and the head sleeve 210, and the tail sleeve 132 and the head sleeve 210 of the embodiment are both made of brass sleeve.
[0051] The elastic pre-tightening member 310 of the embodiment is a spring structure, the spring structure is made of stainless steel, nylon washers 320 are arranged at both ends of the spring structure, and the both ends of the spring structure abut against the tail sleeve 132 and the head sleeve 210 through the nylon washers 320, and the elastic pre-tightening member 310 can be electrically isolated from the shell through the insulation property of the nylon washers 320.
[0052] Further, the elastic pre-tightening member 310 and the elastic buffer 120 can isolate mechanical vibration transmission, and can also realize electrical isolation under the cooperation of the nylon washers 320, so that the signal drift rate is reduced in a high-voltage environment.
[0053] The tail sleeve 132 of the embodiment is provided with an oil discharge hole 133, and the head sleeve 210 is provided with a clamping groove 211 matched with the nylon washer 320, so as to limit and install the nylon washer 320.
[0054] In order to improve the service life, the embodiment adopts maintenance-free installation, and specifically, the embodiment adopts the maintenance-free clasp spring 112 to limit the accelerometer, the rubber sleeve structure is injection sealing after assembly, and the TNC joint at the tail is filled with glue for sealing.
[0055] In use, protection test is needed, ISO VG32 hydraulic oil is sprayed on the surface of the shell (flow rate 5mL / min), and after 24 hours, the change of the internal circuit impedance is detected to be less than 1%, and the effectiveness of the IP54 protection is verified.
[0056] In addition, the shell is fixed to the test bench in a clamping mode through the M27x1.5 thread (including a lock nut), and the installation torque is limited to 5-7N·m, so that the shell is prevented from being deformed.
[0057] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in combination with the embodiment or example are included in at least one embodiment or example of the utility model. In the specification, the exemplary description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner without departing from the purpose of the utility model.
[0058] The embodiments of the utility model are described in detail above in combination with the drawings, but the utility model is not limited to the above embodiments, and various changes can be made within the knowledge range possessed by those skilled in the art without departing from the purpose of the utility model.
Claims
1. A sensor for structural acoustic testing, characterized by, The sensor comprises: a casing assembly (100) comprising a front-end casing (110), an elastic buffer (120) and a rear-end casing (130) connected in sequence; a detection head assembly (200) slidingly installed in the front-end casing (110); a buffer pre-tightening assembly (300) comprising an elastic pre-tightening member (310) acting between the detection head assembly (200) and the rear-end casing (130), the elastic pre-tightening member (310) being used to provide the detection head assembly (200) with a pre-tightening elastic force in the forward direction.
2. The sensor according to claim 1, characterized in that: the front-end casing (110), the elastic buffer (120) and the rear-end casing (130) are all hollow sleeve structures, the interiors of the front-end casing (110), the elastic buffer (120) and the rear-end casing (130) are in communication with each other, the rear-end casing (130) is connected with a connector (134), and a communication lead wire is connected between the detection head assembly (200) and the connector (134).
3. The sensor according to claim 2, characterized in that: the elastic buffer (120) is a rubber sleeve structure, and the two ends of the rubber sleeve structure are connected to the front-end casing (110) and the rear-end casing (130) respectively.
4. The sensor according to claim 3, characterized in that: the two ends of the rubber sleeve structure are sleeved on the outer periphery of the front-end casing (110) and the rear-end casing (130) respectively, the inner peripheral wall of the rubber sleeve structure is provided with a buffer protruding ring (121), the buffer protruding ring (121) is clamped between the end faces of the front-end casing (110) and the rear-end casing (130), the outer periphery of the front-end casing (110) is provided with a front protruding ring (111) abutting against the front end of the rubber sleeve structure, and the outer periphery of the rear-end casing (130) is provided with a rear protruding ring (131) abutting against the rear end of the rubber sleeve structure.
5. The sensor according to claim 2, characterized in that: the detection head assembly (200) comprises a head sleeve (210) slidingly sleeved in the front-end casing (110) and a detection unit (220) installed in the head sleeve (210), the rear end of the head sleeve (210) abuts against the elastic pre-tightening member (310), and the detection unit (220) is connected with the connector (134) through the communication lead wire.
6. The sensor according to claim 5, characterized in that: the detection head assembly (200) further comprises a detection tip (230) installed at the front end of the detection unit (220) and extending out of the head sleeve (210).
7. The sensor according to claim 5, characterized in that: the inner peripheral wall of the front-end casing (110) is provided with a circlip (112) abutting against the front end of the head sleeve (210).
8. The structural acoustic test sensor according to claim 5, characterized in that: The inside of the rear end shell (130) is sleeved with a tail sleeve (132), the connector (134) is installed in the tail sleeve (132), and the elastic pre-tightening piece (310) is arranged between the tail sleeve (132) and the head sleeve (210).
9. The structural acoustic test sensor according to claim 8, characterized in that: The elastic pre-tightening piece (310) is a spring structure, and nylon washers (320) are arranged at two ends of the spring structure respectively.
10. The structural acoustic test sensor according to claim 9, characterized in that: The tail sleeve (132) is provided with an oil discharge hole (133), and the head sleeve (210) is provided with a clamping groove (211) matched with the nylon washer (320).