A protective fixture for a micro inertial measurement unit used in high overload testing

Abstract

This utility model discloses a protective fixture for a micro inertial measurement unit (MMU) used in high overload testing, belonging to the field of micro inertial measurement unit protection technology. It includes a storage module, a connector, a mounting plate, and a protective cover. The storage module is fixedly installed inside the connector and is used to hold a battery or the device under test. One end of the mounting plate is fixedly connected to the connector, and the other end is fixedly connected to the protective cover. The mounting plate is used to install the micro inertial measurement unit and the power chip. This utility model solves the installation problem of micro inertial measurement units under conditions of limited space and harsh launch environments, and is reusable while meeting experimental requirements.

Description

Technical Field

[0001] This utility model belongs to the field of micro inertial measurement unit protection technology, specifically relating to a micro inertial measurement unit protection fixture for high overload testing. Background Technology

[0002] A micro inertial measurement unit (MIMU) consists of a three-axis MEMS gyroscope and a three-axis MEMS accelerometer. By analyzing the angular rate and acceleration outputs of the MIMU, the inertial system can obtain the attitude, velocity, and position information of the carrier. To ensure that the MIMU can provide accurate and reliable data in extreme environments, it is necessary to test the MIMU's high overload resistance. This involves securely and accurately installing the MIMU, completing relevant high overload tests, and measuring its performance indicators after the tests.

[0003] To cope with extremely high overload environments, MIMU test devices are often designed as a robust, monolithic module with a frame-like embedded structure. This "skeleton" is typically machined from high-strength metal materials (such as high-quality alloy steel or aluminum alloy), and the MIMU and MEMS sensors (gyroscopes and accelerometers) are precisely mounted within this frame. The entire frame is then securely embedded into the pre-designed mounting compartment within the projectile. The internal space of the projectile is extremely valuable, and the MIMU and its protective structure must be as miniaturized and lightweight as possible while meeting performance requirements. In addition to impact, high temperatures and severe vibrations must also be considered. Existing MIMU protective structures still have room for improvement in balancing extreme miniaturization and lightweighting with high performance and high reliability, as well as in providing comprehensive protection under extreme multi-physics coupled environments. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a protective fixture for a micro inertial measurement unit for high overload testing. This fixture solves the installation problem of the micro inertial measurement unit under conditions of narrow space and harsh launch environment, and can be reused while meeting the test requirements.

[0005] This utility model provides the following technical solution: A protective fixture for a micro inertial measurement unit (IMU) for high overload testing includes a storage module, a connector, a mounting plate, and a protective cover. The storage module is fixedly installed inside the connector and is used to hold a battery or the device under test. One end of the mounting plate is fixedly connected to the connector, and the other end is fixedly connected to the protective cover. The mounting plate is used to mount the IMU and a power chip.

[0006] As an optional technical solution of this utility model, the storage module is provided with a placement slot for placing a battery or a device under test, and the battery or device under test is encapsulated in the placement slot by high-impedance potting compound.

[0007] As an optional technical solution of this utility model, both ends of the connector are circular openings, and the diameter of the circular opening at one end is smaller than that at the other end.

[0008] As an optional technical solution of this utility model, one end of the storage module is provided with a circular hole for battery wiring, and the end where the circular hole is located is fixed to the end of the connector with a smaller diameter circular opening by a screw.

[0009] As an optional technical solution of this utility model, one end of the mounting plate is provided with a limiting groove, and the other end is provided with a power chip mounting groove; the micro inertial measurement unit is fixed in the limiting groove by screws, and the power chip is encapsulated in the power chip mounting groove by high impedance potting compound.

[0010] As an optional technical solution of this utility model, one end of the mounting plate that mounts the power chip is fixed to the end of the connector with a smaller diameter circular opening by screws, and the other end of the mounting plate that mounts the micro inertial measurement unit is fixed to one end of the protective cover by screws.

[0011] As an optional technical solution of this utility model, the mounting plate is provided with wiring holes, and the limiting groove and the power chip mounting groove are both connected to the wiring holes; the inner diameter of the protective cover is greater than the width of the limiting groove.

[0012] As an optional technical solution of this utility model, when conducting a live test, a battery for powering the power chip is placed inside the storage module, and the battery and the power chip are connected by wires; the power chip is used to power the product, and the positive and negative leads of the power chip pass through the wiring hole to the inner cavity of the protective cover to connect to the product; when not conducting a live test, the device under test is placed inside the storage module.

[0013] Compared with the prior art, the beneficial effects of this utility model are: The protective fixture for micro inertial measurement units (MIMs) used in high overload tests provided by this utility model is simple in structure and can protect the MIMs by mounting them on a mounting plate. It solves the installation problem of MIMs in narrow spaces and harsh launch environments, and can be reused while meeting the test requirements. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of the protective fixture for the micro inertial measurement unit according to an embodiment of this utility model; Figure 2This is an exploded view of the protective fixture for the micro inertial measurement unit in this embodiment of the present invention; Figure 3 This is a schematic diagram of the storage module in an embodiment of this utility model; Figure 4 This is a structural schematic diagram of the connector in an embodiment of this utility model; Figure 5 This is a schematic diagram of the installation disk in an embodiment of this utility model; Figure 6 This is a schematic diagram of the structure of the protective cover in an embodiment of this utility model.

[0015] The following are marked in the diagram: 1. Storage module; 2. Connector; 3. Mounting plate; 4. Protective cover; 1.1. Placement slot; 1.2. Round hole; 1.3. Cover; 3.1. Limiting slot; 3.2. Power chip mounting slot; 3.3. Wiring hole; 4.1. Inner cavity. Detailed Implementation

[0016] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention.

[0017] Example 1 This embodiment provides a protective fixture for a micro inertial measurement unit used in high overload testing, such as... Figure 1-2 As shown, it includes a storage module 1, a connector 2, a mounting plate 3, and a protective cover 4.

[0018] The storage module 1 is fixedly installed inside the connector 2, and the storage module 1 is used to place the battery or the device under test.

[0019] One end of the mounting plate 3 is fixedly connected to the connector 2, and the other end is fixedly connected to the protective cover 4. The mounting plate 3 is used to install the micro inertial measurement unit and the power chip.

[0020] like Figure 3 As shown, the storage module 1 has a placement slot 1.1 for placing a battery or a device under test (DUT), and the cover 1.3 is installed on top of the placement slot 1.1. The battery or DUT is encapsulated in the placement slot 1.1 with high-impedance potting compound. The high-impedance potting compound provides all-around, uniform energy dissipation and stress distribution to ensure that the DUT can survive and acquire valid data.

[0021] like Figure 4 As shown, both ends of the connector 2 are circular openings, and the diameter of the circular opening at one end is smaller than that at the other end.

[0022] One end of the storage module 1 is provided with a circular hole 1.2 for battery wiring. The end of the circular hole 1.2 is fixed to the end of the connector 2 with a smaller diameter circular opening by a screw.

[0023] like Figure 5 As shown, the mounting plate 3 has a limiting groove 3.1 at one end and a power chip mounting groove 3.2 at the other end; the micro inertial measurement unit is fixed in the limiting groove 3.1 by screws. The power chip is encapsulated in the power chip mounting groove 3.2 with high-resistance potting compound. The high-resistance potting compound can evenly disperse impact stress, protect the internal electronic components, and make the power chip less prone to damage. The end of the mounting plate 3 where the power chip is mounted is fixed to the end of the connector 2 with the smaller diameter of the circular opening by screws, and the end of the mounting plate 3 where the micro inertial measurement unit is mounted is fixed to the end of the protective cover 4 by screws. The protective cover 4 covers the micro inertial measurement unit and provides it with support and protection.

[0024] like Figure 5-6 As shown, the mounting plate 3 is provided with wiring holes 3.3, and the limiting groove 3.1 and the power chip mounting groove 3.2 are both connected to the wiring holes 3.3; the inner cavity 4.1 of the protective cover 4 has a diameter greater than the width of the limiting groove 3.1, so that the positive and negative leads of the power chip can pass through.

[0025] In this embodiment, M3 screws are used. The use of threaded connections in high overload tests improves the reliability, safety, and controllability of the test. The protective fixture can be designed with threaded holes for a variety of different parts, greatly improving its versatility. All components of the fixture are reusable, reducing maintenance and replacement costs.

[0026] Example 2 Based on Example 1, two application scenarios for the protective fixture for the micro inertial measurement unit are provided.

[0027] During the live-line test, a battery for powering the power chip is placed inside the storage module 1. The battery and the power chip are connected by wires. The power chip is used to power the product. The positive and negative leads of the power chip pass through the wiring hole 3.3 to the inner cavity 4.1 of the protective cover 4 to connect to the product and power the external product, in order to test the reliability of the micro inertial measurement unit under high overload conditions.

[0028] When not conducting a live test, the storage module 1 is encapsulated with the device under test (DUT). After the test, the encapsulation is removed to test its performance. In this embodiment, the DUT includes a gyroscope and an accelerometer. The bottom and sides of the storage module 1 provide reference surfaces for fixing the DUT. Finally, the entire protective fixture is placed in the reserved position of the test apparatus.

[0029] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0030] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0031] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A micro-inertial measurement unit containment tooling for high overload testing, characterized by: Includes storage module (1), connector (2), mounting plate (3) and protective cover (4); The storage module (1) is fixedly installed inside the connector (2), and the storage module (1) is used to place the battery or the device under test; One end of the mounting plate (3) is fixedly connected to the connector (2), and the other end is fixedly connected to the protective cover (4). The mounting plate (3) is used to install the micro inertial measurement unit and the power chip.

2. The micro-inertial measurement unit (MIMU) protection tooling for high- overload testing of claim 1, wherein: The storage module (1) has a placement slot (1.1) for placing a battery or a device under test. The battery or device under test is encapsulated in the placement slot (1.1) with high-impedance potting compound.

3. The micro-inertial measurement unit (MIMU) protection tooling for high- overload testing of claim 2, wherein: Both ends of the connector (2) are circular openings, and the diameter of the circular opening at one end is smaller than that at the other end.

4. The micro-inertial measurement unit (MIMU) protection tooling for high- overload testing of claim 3, wherein: One end of the storage module (1) is provided with a round hole (1.2) for battery wiring. The end of the circular hole (1.2) is fixed to the end of the connector (2) with the smaller diameter of the circular opening by a screw.

5. The micro-inertial measurement unit (MIMU) protection tooling for high overload testing of claim 3, wherein: The mounting plate (3) has a limiting groove (3.1) at one end and a power chip mounting groove (3.2) at the other end; the micro inertial measurement unit is fixed in the limiting groove (3.1) by screws, and the power chip is encapsulated in the power chip mounting groove (3.2) by high impedance potting compound.

6. The micro-inertial measurement unit (MIMU) protection tooling for high overload testing of claim 5, wherein: The end of the mounting plate (3) on which the power chip is mounted is fixed to the end of the connector (2) with the smaller diameter of the circular opening by screws. The end of the mounting plate (3) on which the micro inertial measurement unit is mounted is fixed to the end of the protective cover (4) by screws.

7. The micro-inertial measurement unit (MIMU) protection tooling for high overload testing of claim 5, wherein: The mounting plate (3) is provided with wiring holes (3.3), and the limiting groove (3.1) and the power chip mounting groove (3.2) are both connected to the wiring holes (3.3). The diameter of the inner cavity (4.1) of the protective cover (4) is greater than the width of the limiting groove (3.1).

8. The micro-inertial measurement unit (MIMU) protection tooling for high- overload testing of claim 7, wherein: During the live test, a battery for powering the power chip is placed inside the storage module (1), and the battery and the power chip are connected by wires; the power chip is used to power the product, and the positive and negative leads of the power chip pass through the wiring hole (3.3) to the inner cavity (4.1) of the protective cover (4) to connect to the product; When no live test is performed, the device under test is placed in the storage module (1).

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