Triaxial piezoelectric acceleration sensor testing tool

Abstract

The utility model discloses a triaxial piezoelectric acceleration sensor testing tool, belongs to the technical field of piezoelectric sensor testing, and solves the problem of low testing efficiency caused by the fact that three axes of a triaxial piezoelectric acceleration sensor need to be subjected to sensitivity testing respectively in the prior art. The tool comprises a tool main body fixed on a standard temperature vibration table, the tool main body comprises an inclined wall surface used for being connected with a triaxial piezoelectric acceleration sensor bolt, the inclined wall surface is a composite inclined surface, and the included angle between the inclined wall surface and a front projection surface and the included angle between the inclined wall surface and an overlook projection surface of the tool main body are both 30-60 degrees. According to the utility model, the triaxial piezoelectric acceleration sensor is fixed on the inclined wall surface of the tool main body, so that the standard temperature vibration table can test the sensitivity of the triaxial piezoelectric acceleration sensor in three axial directions at the same time. During a three-temperature test and a sensitivity temperature response test, three-wheel circulation is reduced to single-wheel circulation, so that the efficiency is remarkably improved.

Description

Technical Field

[0001] This utility model relates to the field of piezoelectric sensor testing technology, specifically to a triaxial piezoelectric accelerometer testing fixture. Background Technology

[0002] Piezoelectric accelerometers are a type of sensor that uses the piezoelectric effect of piezoelectric elements to convert acceleration signals into proportionally output charge or voltage signals. Triaxial piezoelectric accelerometers can simultaneously measure acceleration in three vertical directions, which, from a system perspective, reduces the number of sensors required and lowers costs.

[0003] However, currently available sensitivity calibration testing equipment, namely temperature vibration standard vibration tables, can generally only provide excitation in a single axis (usually the Z-axis). Therefore, existing technologies require testing the X, Y, and Z axes separately when calibrating the sensitivity temperature response of triaxial piezoelectric accelerometers, i.e., performing three test cycles. This is time-consuming, labor-intensive, and energy-intensive, and also has low testing efficiency. Utility Model Content

[0004] To address the aforementioned problems in the prior art, this utility model provides a triaxial piezoelectric accelerometer testing fixture, which solves the problem of low testing efficiency caused by the need to perform sensitivity tests on each of the three axes of the triaxial piezoelectric accelerometer separately in the prior art.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A triaxial piezoelectric accelerometer testing fixture is provided, including a fixture body fixed on a standard temperature vibration table. The fixture body includes an inclined wall for bolting to the triaxial piezoelectric accelerometer. The inclined wall is a composite inclined surface and the angle between it and the frontal projection plane and the top projection plane of the fixture body is 30° to 60°.

[0007] In this design, by fixing the triaxial piezoelectric accelerometer to the inclined wall of the fixture body, the standard temperature vibration table can simultaneously test the sensitivity of the triaxial piezoelectric accelerometer along all three axes. During three-temperature testing and sensitivity temperature response testing, the number of cycles is reduced from three to a single cycle, significantly improving efficiency. Specifically, during the testing process, the fixture can calculate the absolute value of the triaxial piezoelectric accelerometer's sensitivity output in all three axes by adjusting the tilt angle of the inclined wall. Alternatively, it can directly obtain the percentage error of the sensor's sensitivity temperature response, regardless of the influence of the tilt angle.

[0008] Furthermore, the angle between the inclined wall surface and the frontal projection plane and the test projection plane of the fixture body are both 45°. This 45° setting improves the convenience and accuracy of sensitivity testing of the triaxial piezoelectric accelerometer in three axes.

[0009] Furthermore, the tooling body also includes a cylindrical base, on which a frustum is fixed, and the inclined wall is the largest side surface of the frustum.

[0010] Furthermore, the base is provided with multiple threaded holes that mate with the base mounting bolts, and the multiple base mounting bolts pass through the multiple threaded holes to connect with the standard temperature vibration table.

[0011] Furthermore, multiple threaded holes are evenly distributed along the circumference on the upper surface of the base.

[0012] Furthermore, there are three connecting threaded holes, and the central angle between any two adjacent connecting threaded holes is 120°. This setting of the central angle ensures that the three connecting threaded holes are distributed at the three vertices of an equilateral triangle, guaranteeing the stability and rigidity of the base during high and low temperature cycling, and ensuring that vibration excitation can be transmitted evenly and stably to the triaxial piezoelectric accelerometer.

[0013] Furthermore, a mounting threaded hole is vertically drilled through the inclined wall of the frustum to mate with the sensor mounting bolt. The sensor mounting bolt passes through the mounting threaded hole and is bolted to the triaxial piezoelectric accelerometer.

[0014] Furthermore, the frustum is a tilted quadrangular frustum. The quadrangular frustum optimizes space utilization and provides better mechanical support performance, ensuring the safety and stability of the sensor during testing.

[0015] Furthermore, a threaded post is provided on the side of the prism facing away from the inclined wall, which connects to the mounting threaded hole. The threaded post increases the fixing length of the sensor mounting bolt, making the triaxial piezoelectric accelerometer more stable.

[0016] Furthermore, the sensor mounting bolt has an M3 thread diameter. The sensor mounting bolt is an M3 single-thread structure, which simplifies installation and reduces space requirements.

[0017] This utility model discloses a testing fixture for a triaxial piezoelectric accelerometer, the advantages of which are:

[0018] This invention fixes a triaxial piezoelectric accelerometer to the inclined wall of the fixture body, allowing a standard temperature vibration table to simultaneously test the sensitivity of the triaxial piezoelectric accelerometer along all three axes. In three-temperature testing and sensitivity temperature response testing, the efficiency is reduced from three cycles to a single cycle. Attached Figure Description

[0019] Figure 1 An isometric view of a triaxial piezoelectric accelerometer testing fixture;

[0020] The components include: 1. base; 11. threaded connection hole; 2. frustum; 21. inclined wall; 22. threaded post; 3. triaxial piezoelectric accelerometer. Detailed Implementation

[0021] The specific embodiments of this utility model are described below to enable those skilled in the art to understand this utility model. However, it should be understood that this utility model is not limited to the scope of the specific embodiments. For those skilled in the art, as long as various changes are within the spirit and scope of this utility model as defined and determined by the appended claims, these changes are obvious. All utility model creations utilizing the concept of this utility model are within the scope of protection.

[0022] This embodiment provides a triaxial piezoelectric accelerometer testing fixture, which can simultaneously test the sensitivity of the triaxial piezoelectric accelerometer 3 along its three axes. In three-temperature testing and sensitivity temperature response testing, the efficiency is reduced from three cycles to a single cycle, significantly improving efficiency. A detailed demonstration follows.

[0023] refer to Figure 1 The triaxial piezoelectric accelerometer test fixture includes a main body fixed on a standard temperature vibration table. The main body comprises a base 1 and a frustum 2 fixed to the base 1. The base 1 is a cylindrical structure with multiple threaded holes 11 that mate with mounting bolts. These mounting bolts pass through the threaded holes 11 and are threadedly connected to the standard temperature vibration table. Preferably, there are three threaded holes 11, with a central angle of 120° between any two adjacent holes. This arrangement of the central angle ensures that the three threaded holes 11 are distributed at the three vertices of an equilateral triangle, guaranteeing the stability and rigidity of the base 1 during high and low temperature cycling, and ensuring that the vibration excitation is transmitted uniformly and stably to the triaxial piezoelectric accelerometer 3.

[0024] The frustum 2 is an inclined quadrangular frustum, with one of its largest sides being an inclined wall 21, which is used for bolt connection to the triaxial piezoelectric accelerometer 3. The inclined wall 21 is a composite inclined surface, and the angles between it and the frontal and top projection planes of the fixture body are both 30° to 60°. Preferably, the angles between the inclined wall 21 and both the frontal and test projection planes of the fixture body are 45°. This 45° setting improves the convenience and accuracy of sensitivity testing of the triaxial piezoelectric accelerometer 3 in the three axes. During testing, the test fixture can calculate the absolute value of the sensitivity output of the triaxial piezoelectric accelerometer 3 in the three axes by converting the tilt angle of the inclined wall 21, or it can directly obtain the percentage error of the sensor's sensitivity temperature response regardless of the influence of the tilt angle.

[0025] As a specific bolted connection structure between the inclined wall 21 and the triaxial piezoelectric accelerometer 3, the inclined wall 21 of the frustum 2 has a vertical through-hole for mounting bolts that mate with the sensor mounting bolts. The sensor mounting bolts pass through the mounting bolt holes and are bolted to the triaxial piezoelectric accelerometer 3.

[0026] As a further embodiment, a threaded post 22 connected to a mounting threaded hole is provided on the side of the frustum 2 facing away from the inclined wall 21. The sensor mounting bolt passes through the threaded post 22 and the frustum 2 in sequence and is bolted to the triaxial piezoelectric accelerometer 3. Preferably, the thread diameter of the sensor mounting bolt is M3. The sensor mounting bolt has an M3 single thread structure, which is simple to install and occupies little space.

[0027] In summary, the beneficial effects of this solution are:

[0028] This solution fixes the triaxial piezoelectric accelerometer 3 to the inclined wall 21 of the fixture body, allowing the standard temperature vibration table to simultaneously test the sensitivity of the triaxial piezoelectric accelerometer 3 along all three axes. In three-temperature testing and sensitivity temperature response testing, the efficiency is reduced from three cycles to a single cycle.

[0029] Although the specific embodiments of the utility model have been described in detail with reference to the accompanying drawings, this should not be construed as limiting the scope of protection of this patent. Various modifications and variations that can be made by those skilled in the art without inventive effort within the scope described in the claims still fall within the scope of protection of this patent.

Claims

1. A testing fixture for a triaxial piezoelectric accelerometer, characterized in that, The fixture body includes a tooling body fixed on a standard temperature vibration table. The tooling body includes an inclined wall (21) for bolting to a triaxial piezoelectric accelerometer (3). The inclined wall (21) is a composite inclined surface and the angle between it and the frontal projection surface and the top projection surface of the tooling body is 30° to 60°.

2. The triaxial piezoelectric accelerometer testing fixture according to claim 1, characterized in that, The angle between the inclined wall (21) and the frontal projection surface and the test projection surface of the tooling body is 45°.

3. The triaxial piezoelectric accelerometer testing fixture according to claim 1, characterized in that, The tooling body also includes a cylindrical base (1), on which a frustum (2) is fixed, and the inclined wall (21) is the largest side surface of the frustum (2).

4. The triaxial piezoelectric accelerometer testing fixture according to claim 3, characterized in that, The base (1) is provided with a plurality of threaded holes (11) that respectively mate with the base mounting bolts. The plurality of base mounting bolts pass through the plurality of threaded holes (11) and are threadedly connected to the standard temperature vibration table.

5. The triaxial piezoelectric accelerometer testing fixture according to claim 4, characterized in that, Multiple threaded holes (11) are evenly distributed along the circumference on the upper surface of the base (1).

6. The triaxial piezoelectric accelerometer testing fixture according to claim 5, characterized in that, The number of connecting threaded holes (11) is 3, and the central angle between two adjacent connecting threaded holes (11) is 120°.

7. The triaxial piezoelectric accelerometer testing fixture according to claim 3, characterized in that, The inclined wall (21) of the frustum (2) is vertically perforated with a mounting threaded hole that mates with the sensor mounting bolt. The sensor mounting bolt passes through the mounting threaded hole and is bolted to the triaxial piezoelectric accelerometer (3).

8. The triaxial piezoelectric accelerometer testing fixture according to claim 7, characterized in that, The frustum (2) is a quadrangular frustum that is set at an inclination.

9. The triaxial piezoelectric accelerometer testing fixture according to claim 7, characterized in that, The frustum (2) has a threaded post (22) connected to the mounting threaded hole on the side facing away from the inclined wall (21).

10. The triaxial piezoelectric accelerometer testing fixture according to claim 7, characterized in that, The thread diameter of the sensor mounting bolt is M3.

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