Double-shaft micro-accelerometer assembly

Abstract

The utility model discloses a biaxial micro accelerometer assembly, which comprises an accelerometer body and a connecting plate, the accelerometer body is arranged at the top of the connecting plate, a supporting assembly is arranged between the accelerometer body and the connecting plate, the supporting assembly comprises a universal shaft, and the universal shaft is arranged on the connecting plate. The two ends of the universal shaft are fixedly connected to the outer wall of the end, close to the connecting plate, of the accelerometer body respectively, the four corners of the outer wall of the top of the connecting plate are each fixedly connected with a threaded sleeve, the interiors of the four threaded sleeves are each in threaded connection with a threaded rod, and one end of the top of each threaded rod is fixedly connected with a supporting head. According to the utility model, through the arrangement of the supporting assembly, the accelerometer body can adapt to different installation environments and can be kept in a horizontal state, so that the measurement precision of the accelerometer in the working process can be ensured.

Description

Technical Field

[0001] This utility model relates to the field of accelerometer technology, specifically to a dual-axis micro accelerometer assembly. Background Technology

[0002] A micro accelerometer is a sensor based on microelectromechanical systems (MEMS) technology used to measure the acceleration of an object. Its core principle is to convert the deformation or displacement of a microstructure under acceleration into a measurable electrical signal, thereby detecting the acceleration. A dual-axis accelerometer can simultaneously measure acceleration in two perpendicular directions, making it suitable for scenarios requiring multi-directional detection.

[0003] A search revealed a utility model patent with Chinese patent publication number CN112798821B, which discloses a biaxial piezoelectric accelerometer, comprising a large rectangular frame and a small rectangular frame on the same plane and coaxial, with a mass block disposed within the small rectangular frame; four beams of equal length and symmetrical arrangement are fixed between the small rectangular frame and the mass block, and four beams of equal length and symmetrical arrangement are fixed between the large rectangular frame and the small rectangular frame; the direction of the straight line containing the fifth to eighth beams is defined as the y-axis, which is perpendicular to the x-axis.

[0004] The measurement accuracy of a dual-axis accelerometer is highly dependent on its installation level. If the installation is tilted or not calibrated, it will lead to zero bias error, cross-axis interference and nonlinear output, which will affect the system performance. If the above device is installed directly, if the installation position is not level, it will inevitably affect the measurement accuracy, and there is room for improvement. Utility Model Content

[0005] The purpose of this invention is to provide a dual-axis micro accelerometer assembly to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a dual-axis micro accelerometer assembly, comprising an accelerometer body and a connecting plate, wherein the accelerometer body is located on top of the connecting plate, and a support assembly is installed between the accelerometer body and the connecting plate, the support assembly comprising a universal joint, both ends of the universal joint being fixedly connected to the outer wall of the accelerometer body and the connecting plate respectively, and each of the four corners of the top outer wall of the connecting plate being fixedly connected to a threaded sleeve, each of the four threaded sleeves being threadedly connected to a screw rod, each of the four screw rods having a support head fixedly connected to one top end, and each of the four screw rods having a drive ring coaxially fixed to the top of the circumferential outer wall.

[0007] This design allows the accelerometer body to adapt to different installation environments and maintain a horizontal position, thus ensuring measurement accuracy during operation. Since the accelerometer body and connecting plate are connected by a universal joint, the accelerometer body can be tilted freely in all directions, ensuring it remains horizontal regardless of its installation location. Then, the four screws are adjusted sequentially, driven by the drive ring to rotate them. The screws rotate and move upwards along the threaded sleeve until the support heads at the ends of all four screws contact the bottom wall of the accelerometer body. Adjusting the remaining three screws, with the support and constraint of the four support heads, ensures the accelerometer body remains stable and does not tilt arbitrarily.

[0008] As a further preferred embodiment of this technical solution, a connector is provided on the outside of the accelerometer body, and a limit component is installed on the outside of the connector.

[0009] As a further preferred embodiment of this technical solution, the limiting component includes a mounting bracket, which is fixedly connected to the outer wall of one side of the accelerometer body. A bidirectional lead screw is rotatably connected inside the mounting bracket, and a limiting rod is fixedly connected inside the mounting bracket. A movable seat is threaded onto the threaded ends of the bidirectional lead screw, and the two movable seats are slidably fitted onto the outside of the limiting rod. A limiting cover is fixedly connected to the end of the two movable seats that are close to each other, and the two limiting covers are located outside the connector.

[0010] Connect the plug of the external wiring harness to the connector, and then drive the bidirectional screw to rotate by the handle. Under the restriction of the limit rod and the drive of the bidirectional screw, the two moving seats will move closer to each other in the horizontal direction. The limit cover fixed at the end of the moving seat will also cover the plug. If the connector is subjected to external force, the connector will not be able to detach from the connector under the restriction of the two limit covers, which helps to ensure the stability of the device.

[0011] As a further preferred embodiment of this technical solution, a level is fixedly installed on the top outer wall of the accelerometer body.

[0012] As a further preferred embodiment of this technical solution, the outer walls of the two limiting covers that are close to each other are both set to be arc-shaped.

[0013] As a further preferred embodiment of this technical solution, the thread helix angle of the threads at both ends of the bidirectional lead screw and the external thread of the screw is less than the equivalent friction angle.

[0014] As a further preferred embodiment of this technical solution, the accelerometer body is internally composed of a mass block, a cantilever beam, fixed electrodes, a support frame, and a signal processing circuit.

[0015] This utility model provides a dual-axis micro accelerometer assembly, which has the following beneficial effects:

[0016] (1) By setting up a support component, the accelerometer body can adapt to different installation environments and keep it in a horizontal state, which is conducive to ensuring the measurement accuracy of the accelerometer during operation. Since the accelerometer body and the connecting plate are connected by a universal joint, the accelerometer body can be tilted freely in all directions, ensuring that the accelerometer body can be adjusted to a horizontal state in different positions. Then, the four screws are adjusted in sequence, and the screws are driven to rotate by the drive ring. The screws rotate and move upward along the screw sleeve until the support heads at the ends of the four screws are in contact with the bottom wall of the accelerometer body. Then, the other three screws are adjusted respectively. Under the support and restriction of the four support heads, the accelerometer body will maintain a stable state and will not tilt arbitrarily.

[0017] (2) By setting a limiting component, the plug of the external wire harness is connected to the connector. Then, the handle drives the bidirectional screw to rotate. Under the limitation of the limiting rod and the drive of the bidirectional screw, the two moving seats will move closer to each other in the horizontal direction. The limiting cover fixed at the end of the moving seat will also cover the plug. If the connector is subjected to external force, under the limitation of the two limiting covers, the connector will not be able to detach from the connector, which helps to ensure the stability of the device. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall first-view structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the overall second-view structure of this utility model;

[0020] Figure 3 For the present utility model Figure 2 Enlarged structural diagram at point A in the middle;

[0021] Figure 4 For the present utility model Figure 2 Enlarged structural diagram at point B;

[0022] In the diagram: 1. Accelerometer body; 2. Connecting plate; 3. Level; 4. Wiring connector; 5. Support assembly; 6. Limiting assembly; 501. Universal joint; 502. Screw sleeve; 503. Screw; 504. Support head; 505. Drive ring; 601. Mounting bracket; 602. Two-way lead screw; 603. Limiting rod; 604. Moving seat; 605. Limiting cover. Detailed Implementation

[0023] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0024] This utility model provides a technical solution: such as Figure 2 and Figure 4As shown in this embodiment, a dual-axis micro accelerometer assembly includes an accelerometer body 1 and a connecting plate 2. The accelerometer body 1 is located on top of the connecting plate 2. A support assembly 5 is installed between the accelerometer body 1 and the connecting plate 2. The support assembly 5 includes a universal joint 501. The two ends of the universal joint 501 are respectively fixedly connected to the outer wall of the accelerometer body 1 and the connecting plate 2 at the adjacent ends. A screw sleeve 502 is fixedly connected to each of the four corners of the top outer wall of the connecting plate 2. A screw rod 503 is threadedly connected inside each of the four screw sleeves 502. A support head 504 is fixedly connected to the top of each of the four screw rods 503. A drive ring 505 is coaxially fixed to the top of the outer circumference of each of the four screw rods 503.

[0025] Since the accelerometer body 1 and the connecting plate 2 are connected by a universal joint 501, the accelerometer body 1 can be tilted freely in all directions, ensuring that the accelerometer body 1 can be adjusted to a horizontal state in different positions. Then, the four screws 503 are adjusted in sequence, and the screws 503 are driven to rotate by the drive ring 505. The screws 503 rotate and move upward along the screw sleeve 502 until the support heads 504 at the ends of the four screws 503 are in contact with the bottom wall of the accelerometer body 1. Then, the other three screws 503 are adjusted respectively. Under the support and constraint of the four support heads 504, the accelerometer body 1 will maintain a stable state and will not tilt arbitrarily.

[0026] like Figure 2 and Figure 3 As shown, the accelerometer body 1 has a connector 4 on its exterior, and a limit component 6 is installed on the exterior of the connector 4.

[0027] The limiting component 6 includes a mounting bracket 601, which is fixedly connected to the outer wall of one side of the accelerometer body 1. A bidirectional lead screw 602 is rotatably connected inside the mounting bracket 601. A limiting rod 603 is fixedly connected inside the mounting bracket 601. A movable seat 604 is threaded at both ends of the bidirectional lead screw 602. Both movable seats 604 are slidably sleeved outside the limiting rod 603. A limiting cover 605 is fixedly connected to the end of the two movable seats 604 that is close to each other. Both limiting covers 605 are located outside the connector 4.

[0028] Next, connect the plug of the external wiring harness to the connector 4, and then drive the bidirectional lead screw 602 to rotate by the handle. Under the restriction of the limit rod 603 and the drive of the bidirectional lead screw 602, the two moving seats 604 will move closer to each other in the horizontal direction. The limit cover 605 fixed to the end of the moving seat 604 will also cover the outside of the plug. If the connector is subjected to external force, under the restriction of the two limit covers 605, the connector will not be able to detach from the connector 4, which helps to ensure the stability of the device.

[0029] like Figure 1 and Figure 2As shown, a level 3 is fixedly installed on the top outer wall of the accelerometer body 1. The state of the accelerometer body 1 can be judged more intuitively by referring to the level 3.

[0030] like Figure 1 and Figure 2 As shown, the outer walls of the two limiting covers 605 that are close to each other are both set to be arc-shaped, which makes the process of the limiting cover 605 being fitted onto the external joint more fault-tolerant.

[0031] like Figure 3 and Figure 4 As shown, the thread helix angle of the threads at both ends of the bidirectional lead screw 602 and the external thread of the screw 503 is less than the equivalent friction angle, which makes both of them self-locking.

[0032] like Figure 1 and Figure 2 As shown, the accelerometer body 1 internally consists of a mass block, a cantilever beam, fixed electrodes, a support frame, and a signal processing circuit. X-axis acceleration measurement: Acceleration causes the mass block to move to the right, compressing the right cantilever beam and stretching the left cantilever beam. The right capacitor Cx+ decreases, and the left capacitor Cx- increases, resulting in a differential output ΔCx = Cx- - Cx+. The signal processing circuit converts ΔCx into a voltage signal, which, after decoupling and compensation, outputs the X-axis acceleration value. Y-axis acceleration measurement: The principle is the same as the X-axis, achieved through a vertical electrode group.

[0033] This utility model provides a dual-axis micro accelerometer assembly, the specific working principle of which is as follows:

[0034] When the device is in operation, the connecting plate 2 is fixed in the position to be installed using bolts. Since the accelerometer body 1 and the connecting plate 2 are connected by the universal joint 501, the accelerometer body 1 can be tilted freely in all directions, ensuring that the accelerometer body 1 can be adjusted to a horizontal state in different positions. Then, the four screws 503 are adjusted in sequence, and the screws 503 are driven to rotate by the drive ring 505. The screws 503 rotate and move upward along the screw sleeve 502 until the support heads 504 at the ends of the four screws 503 are in contact with the bottom wall of the accelerometer body 1. Then, the other three screws 503 are adjusted respectively. Under the support and constraint of the four support heads 504, the accelerometer body 1 will maintain a stable state and will not tilt arbitrarily. The state of the accelerometer body 1 can be more intuitively judged by referring to the level 3. Next, connect the plug of the external wiring harness to the connector 4, and then drive the bidirectional lead screw 602 to rotate by the handle. Under the restriction of the limit rod 603 and the drive of the bidirectional lead screw 602, the two moving seats 604 will move closer to each other in the horizontal direction. The limit cover 605 fixed to the end of the moving seat 604 will also cover the outside of the plug. If the connector is subjected to external force, under the restriction of the two limit covers 605, the connector will not be able to detach from the connector 4, which helps to ensure the stability of the device.

[0035] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A dual-axis micro accelerometer assembly, comprising an accelerometer body (1) and a connecting plate (2), characterized in that: The accelerometer body (1) is located on top of the connecting plate (2). A support assembly (5) is installed between the accelerometer body (1) and the connecting plate (2). The support assembly (5) includes a universal joint (501). The two ends of the universal joint (501) are respectively fixedly connected to the outer wall of the accelerometer body (1) and the connecting plate (2) at one end. A screw sleeve (502) is fixedly connected to each of the four corners of the top outer wall of the connecting plate (2). A screw rod (503) is threaded inside each of the four screw sleeves (502). A support head (504) is fixedly connected to one end of the top of each of the four screw rods (503). A drive ring (505) is coaxially fixed to the top of the circumferential outer wall of each of the four screw rods (503).

2. The dual-axis micro-accelerometer assembly according to claim 1, characterized in that: The accelerometer body (1) is provided with a connector (4) on the outside, and a limit component (6) is installed on the outside of the connector (4).

3. A dual-axis micro-accelerometer assembly according to claim 2, characterized in that: The limiting component (6) includes a mounting bracket (601), which is fixedly connected to the outer wall of one side of the accelerometer body (1). A bidirectional lead screw (602) is rotatably connected inside the mounting bracket (601). A limiting rod (603) is fixedly connected inside the mounting bracket (601). A movable seat (604) is threaded at both ends of the bidirectional lead screw (602). Both movable seats (604) are slidably sleeved outside the limiting rod (603). A limiting cover (605) is fixedly connected to the end of the two movable seats (604) that is close to each other. Both limiting covers (605) are outside the connector (4).

4. A dual-axis micro-accelerometer assembly according to claim 1, characterized in that: A level (3) is fixedly installed on the top outer wall of the accelerometer body (1).

5. A biaxial micro accelerometer assembly according to claim 3, characterized in that: The outer walls of the two limiting covers (605) that are close to each other are both set to be arc-shaped.

6. A biaxial micro accelerometer assembly according to claim 3, characterized in that: The thread helix angle of the threads at both ends of the bidirectional lead screw (602) and the external thread of the screw (503) is less than the equivalent friction angle.

7. A biaxial micro accelerometer assembly according to claim 1, characterized in that: The accelerometer body (1) is internally composed of a mass block, a cantilever beam, fixed electrodes, a support frame, and a signal processing circuit.

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