MEMS inertial measurement structure

Abstract

The utility model belongs to the technical field of sensors, and particularly relates to an MEMS (Micro Electro Mechanical System) inertial measurement structure, which is characterized in that the bottom of a shell is provided with a mounting base body with a base, the lower end surface of the base is integrally provided with two symmetrically distributed clamping blocks, the upper end surface of the base is provided with axial connecting holes corresponding to the clamping blocks, and the axial connecting holes respectively penetrate through the corresponding clamping blocks; axial connecting holes are formed in the clamping blocks, locking screws are assembled in the axial connecting holes, fixing holes orthogonal to the axial connecting holes are formed in the radial side walls of the clamping blocks, positioning pin rods are arranged in the fixing holes in a penetrating mode, and butt joint through holes allowing the locking screws to penetrate through are formed in the circumferential side walls of the positioning pin rods; compared with the prior art, the mounting structure is more accurate in mounting and does not cause damage to joints.

Description

TECHNICAL FIELD

[0001] The utility model relates to sensor technical field more specifically, it relates to a MEMS inertial measurement structure. BACKGROUND

[0002] MEMS inertial measurement unit belongs to strapdown inertial navigation system, and the system is composed of three MEMS accelerometers and three-axis MEMS gyroscopes, the accelerometer is used to feel acceleration component of carrier relative to the vertical line, and the angular velocity sensor is used to feel the angular velocity information of the carrier.

[0003] For example, the authorized announcement No. CN 212030559 U discloses a kind of MEMS inertial measurement unit, discards the traditional shell base and screw fixed installation and fixed mode, gyroscope is set on side wall, make full use of the internal space of shell, reach the purpose that MIMU volume is as small as possible, also reduce the processing difficulty of product structure piece;Gyroscope, accelerometer, temperature signal output and gyroscope zero real-time update are through serial port to carry out command interaction and data transmission, microprocessor will obtain the zero update value storage to storage module, and read the value at each time system start, compensate and correct gyroscope zero, realize real-time correction to MEMS gyroscope zero at any time, make its zero time-varying drift be inhibited.

[0004] In actual use process, the stability of base needs to be kept at all times to ensure the accuracy of measurement, the base is fixed by screw when being placed, which can cause damage to the placement place and increase the use cost. UTILITY MODEL CONTENT

[0005] In view of the deficiencies existing in the prior art, the purpose of the utility model is to provide a MEMS inertial measurement structure which is more convenient to install and fix.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical scheme:

[0007] A MEMS inertial measurement structure, comprising a shell and a measurement unit placed in the shell, characterized in that: the bottom of the shell is provided with a mounting base with a base, the lower end face of the base is integrally provided with two symmetrically distributed clamping blocks,

[0008] The upper end face of the base is provided with an axial connecting hole corresponding to each clamping block, and the axial connecting hole penetrates through the corresponding clamping block respectively.

[0009] A locking screw is assembled in the axial connecting hole,

[0010] A fixing hole orthogonal to the axial connecting hole is formed in the radial side wall of each clamping block, and a positioning pin is arranged in the fixing hole,

[0011] The circumferential side wall of the positioning pin rod is provided with a butt joint through hole for the locking screw rod to pass through.

[0012] The utility model further sets up: the inner wall of fixed hole is provided with axial slide groove symmetrically, the outer peripheral surface of positioning pin rod is provided with the protruding guide key correspondingly, the guide key forms the slidable joint fit with axial slide groove.

[0013] The utility model further sets up: the entrance end of axial connecting hole is provided with 45 degrees guide chamfer.

[0014] The utility model further sets up: the butt joint through hole of positioning pin rod forms coaxial assembly structure with locking screw rod.

[0015] Compared with the prior art, the utility model has the beneficial effects that:

[0016] By setting the integrated clamping block and base structure, the overall anti-vibration performance is improved by more than 40%, the fixed hole and the axial connecting hole are orthogonally distributed to form a three-dimensional positioning system, the installation skewing error is eliminated, the axial slide groove makes the assembly repeatability of the positioning pin rod reach, the guide chamfer design improves the assembly coaxiality of the locking screw rod, and the installation is more accurate and the connection is not damaged. BRIEF DESCRIPTION OF DRAWINGS

[0017] Fig. 1 It is a shell structure schematic view of the utility model embodiment;

[0018] Fig. 2 It is a structure schematic view of the utility model embodiment;

[0019] Fig. 3 It is a local schematic view of the utility model embodiment.

[0020] Shell 1, base 2, clamping block 3, axial connecting hole 4, locking screw 5, fixed hole 6, positioning pin rod 7, butt joint through hole 8, axial slide groove 9, guide key 10. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0022] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They 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. Therefore, they should not be construed as limitations on this utility model.

[0023] Working principle: During installation, place the connector between the two clamping blocks 3, then pass the positioning pin 7 through the fixing hole 6, and align the guide key 10 on the positioning pin 7 with the axial sliding groove 9 at the fixing hole 6. Then, pass the locking screw 5 through the axial connecting hole 4 and through the mating through hole 8 on the positioning pin 7, so that the locking screw 5 locks the positioning pin 7.

[0024] like Figs. 1 to 3 As shown, it includes a housing 1, the inner cavity of which is equipped with a measurement unit consisting of a triaxial MEMS accelerometer.

[0025] The bottom of the housing 1 is integrally formed with a base 2 through a micro-precision casting process. The lower surface of the base 2 extends to form two symmetrically distributed clamping blocks 3, and the connector is located between the two clamping blocks 3.

[0026] Two sets of axial connection holes 4 are formed on the upper surface of the base 2. The perpendicularity of the axis of the axial connection hole 4 to the plane of the base 2 is ≤0.01mm. The axial connection hole 4 passes through the clamping block 3 to form a through hole structure. The inlet end of the axial connection hole 4 is machined with a 45° guide chamfer to facilitate the passage of the locking screw. The locking screw 5 is installed in the axial connection hole 4. The clearance fit tolerance between the outer diameter of the screw and the axial connection hole 4 is H7 / g6.

[0027] The clamping block 3 has a fixing hole 6 on its side wall. The axis of the fixing hole 6 is orthogonal to the axial connecting hole 4 and intersects at the center line of the clamping block 3. Two symmetrical axial grooves 9 are machined on the inner wall of the fixing hole 6, with a groove depth of 0.5 mm and an inclination angle of 55°. Two raised trapezoidal guide keys 10 are integrally formed on the surface of the positioning pin 7, with a key height of 0.45 mm, forming a sliding pair with the axial grooves 9. A through hole 8 is opened in the middle of the positioning pin. During assembly, the axis of the through hole 8 is automatically aligned with the center line of the locking screw 5 by the positioning of the guide keys 10 and the grooves.

[0028] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any ordinary changes and substitutions made by those skilled in the art within the scope of the technical solution of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A MEMS inertial measurement structure comprising a housing (1) and a measurement unit placed inside the housing (1), characterized in that: The bottom of the shell (1) is provided with a mounting base (2) with a bottom, and the lower end surface of the base (2) is integrally provided with two symmetrically distributed clamping blocks (3), The upper end surface of the base (2) is provided with an axial connecting hole (4) corresponding to each clamping block (3), and the axial connecting hole (4) penetrates through the corresponding clamping block (3); An locking screw (5) is assembled in the axial connecting hole (4), The radial side wall of each clamping block (3) is provided with a fixing hole (6) orthogonal to the axial connecting hole (4), and a positioning pin rod (7) is arranged in the fixing hole (6), The circumferential side wall of the positioning pin rod (7) is provided with a butt joint through hole (8) for the locking screw (5) to pass through.

2. The MEMS inertial measurement structure of claim 1, wherein: The inner wall of the fixing hole (6) is symmetrically provided with an axial sliding groove (9), and the outer circumferential surface of the positioning pin rod (7) is correspondingly provided with a protruding guide key (10), and the guide key (10) and the axial sliding groove (9) form a slidable clamping fit.

3. The MEMS inertial measurement structure of claim 1, wherein: The entrance end of the axial connecting hole (4) is provided with a 45° guide chamfer.

4. The MEMS inertial measurement structure of claim 2, wherein: The butt joint through hole (8) of the positioning pin rod (7) and the locking screw (5) form a coaxial assembly structure.

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