CN111397601B - Little inertia measurement unit shock-resistant damping structure and damping system - Google Patents

Abstract

The invention discloses an impact-resistant vibration damping structure and a vibration damping system of a micro-inertia measuring unit, which are used for damping a micro-inertia module supported by a support frame. The vibration reduction structure comprises a vibration isolator arranged on the support frame; the support frame adopts a hexahedral frame structure, and eight vertex angles of the hexahedral frame structure are respectively provided with a vibration isolator; the vibration isolator is a pair of mutually matched silicon rubber shock pads formed by dividing a dividing surface. The invention realizes the vibration reduction and impact resistance of the micro-inertia module by combining the inner part and the outer part, can realize the multiple attenuation of vibration, has good vibration effect and simple assembly, and is suitable for the vibration reduction under the condition of limited installation space environment.

Description

Little inertia measurement unit shock-resistant damping structure and damping system

Technical Field

The invention relates to impact resistance and vibration reduction of an inertia measurement unit, and mainly relates to the field of mechanical structure and buffering vibration isolation design.

Background

The micro-inertial measurement unit is an inertial measurement system based on MEMS technology. The MEMS technology is developed along with the development of the semiconductor integrated circuit micro-processing technology and the precision mechanical super-processing technology, and integrates a micro sensor, a micro actuator, a micro mechanical structure, and a related signal processing circuit on the basis of the micro-electronic technology in combination with the precision mechanical technology. The MEMS inertial device is formed by integrally packaging a sensitive microstructure and a signal processing circuit through the application of a silicon micro-processing technology and a highly integrated process technology, so that the miniaturization and the electromechanical integration of a system are realized. The micro-inertia measurement unit serving as a technical product is used as carrier attitude angle and acceleration measurement equipment adopting MEMS technology, and is widely applied to aspects such as vehicle navigation, unmanned aerial vehicle flight control, missile navigation, attitude feedback, robot control and the like due to the characteristics of small volume, light weight, low cost, high reliability and the like.

The micro-inertia measurement unit comprises an MEMS gyroscope and an MEMS accelerometer, and senses the state of the carrier through the movement or displacement of an internal micro-mechanical structure. The MEMS gyroscope utilizes a Coriolis effect (Coriolis effect) to sense angular velocity, and the MEMS accelerometer senses linear acceleration based on an inertia principle. Due to the wide application requirements of the micro-inertia measurement unit in the high-overload and high-dynamic environment, and the performance loss and even failure of the micro-mechanical structure in the MEMS sensor integrated in the micro-inertia measurement unit are easy to occur in the environment, the micro-inertia measurement unit needs to be protected from the environment. The general means comprises the steps of encapsulating a circuit of the guidance system by using an encapsulating material with better dynamic performance, and solidifying the encapsulating material into a module; or vibration isolation is adopted to reduce the influence of the external environment.

The prior art and the existing defects are as follows:

due to the application field of the micro-inertia measurement unit, the micro-inertia measurement unit is usually installed in a narrow space, and the isolation protection mechanism should be designed inside the micro-inertia measurement unit in consideration of the installation reliability, so that the micro-inertia measurement unit needs to be miniaturized and integrated. In order to ensure the survival and stable performance of the micro-inertia measurement unit under the high-overload and high-dynamic environment, the impact protection and vibration isolation must be considered at the same time.

The invention patent (CN 106153044A) discloses a vibration damping structure for a micro-inertia measurement unit, which is used for suspending a product through an elastic vibration damping ring with a groove. The structure avoids the problem of poor rigidity of a distributed vibration damping design through an integral elastic vibration damping structure, and reduces the deviation of an elastic center and the center of a vibration damped product; and the cross section of the elastic vibration damping ring is symmetrical to the radial central axis, so that the radial rigidity and the axial rigidity of the system are ensured to be the same, the frequency range of the system is reduced, and the control of the amplification rate of the system on vibration is facilitated. The structure is fixed with the circular ring bulge of the product through the vibration reduction ring groove, and the possibility that the product and the external shell rotate relatively due to vibration exists in the working process, so that the system work is influenced.

The invention patent of isolation vibration damper and three-axis gyroscope (CN 109612461A) provides a vibration damping method for isolating the gyroscopes of three measuring axes independently through a separation vibration damper and supporting and restricting the gyroscopes by using a limit structure. The three-axis gyroscope transmits the measured data to the data processing unit through electrical connection, and is led out through the connector. The design utilizes the multistage vibration absorber to realize the independence between the measuring shafts and avoid the vibration error coupling between the shafts. The system is a three-axis gyroscope, and when product quadrature error compensation is carried out, the output of other axial gyroscopes is generally required to be utilized to calculate a non-quadrature error coefficient. Because the triaxial gyroscope is independent in vibration isolation, and the vibration condition of the practical application environment is different from that of calibration, the axial relation changes, and the orthogonal calibration compensation failure and even the non-orthogonal error increase can be caused.

The utility model discloses a stage body structure of eight point to heart damping installations (CN 205278225U), the suspension damping system of inertia sensitive subassembly (CN 202692990U) have all adopted the design method that eight endpoints of space hexahedron arranged the shock absorber of the same race, and the same kind of shock absorber of symmetric installation has reduced each axial damping configuration error of product and axial fixity requirement, has subducted the triaxial rigidity that varies of damping system. The axial configuration of the symmetrically distributed shock absorbers in each patent method is slightly different, and according to the difference between the application environment and the hexahedral structure, the shock absorption system is respectively realized by axial body center intersection and axial horizontal symmetry.

The utility model discloses a damping structure of fretwork frame form of utilizing vibration isolation fastener and installing support is proposed to laser gyroscope inertia measuring device's damping device (CN 201858989U). Vibration damping of the laser gyro inertia measuring device under certain displacement is realized by using a vibration isolation pad, a limiting sleeve and a screw nut of the vibration isolation fastening device; the annular connecting frame and the hollow bracket are used for suspending and supporting the hollow bracket to ensure that the hollow bracket is in a non-fixed connection state. High-performance alloy and high-performance damping rubber are selected as materials of the vibration damper, so that the requirements of the IMU (inertial measurement Unit) of the laser gyroscope with larger mass on supporting strength and vibration damping are met, and the installation feasibility of the laser gyroscope in a narrow space is ensured. The vibration reduction method is applied to the outer part of the laser gyro inertia measurement device and depends on the annular connecting frame, so that the requirement on the installation space is large, and the method is not suitable for the application and installation environment with narrow micro inertia measurement units.

The utility model discloses an inside damping structure of inertia measuring set qxcomm technology of suspension type (CN 206019660U) provides a damping structure based on damping stand and through-hole quality piece. The constraint fit of the damping upright column and the through hole of the mass block in the axial direction is realized by utilizing the sectional design of the diameter of the damping upright column; and an upper rubber ring and a lower rubber ring are respectively added at the matching part of the damping upright post convex ring and the mass block through hole step ring, so that the full-axial damping of the system is realized. Because the vibration reduction system is arranged in the assembly system, the inertia assembly is directly and fixedly connected with the carrier, an external structure is not required to be added, the assembly reliability is improved, and the problems of aging and corrosion of rubber materials exposed in the vibration reduction structure are solved.

U.S. patent application publication system for an inertial measurement unit (US 2007113702(a 1)) proposes a vibration Isolation system for use in inertial sensor assemblies. The vibration isolation system mainly comprises a cover plate component, an isolator and a base component, wherein the isolator comprises a rigid inner ring, a rigid outer ring and an elastic body. The inertial sensor assembly is mounted through a plurality of fixing holes of the isolator inner ring, and the isolator, the cover plate component and the base component are matched and fixed through a plurality of through holes in the outer ring. The inner ring and the outer ring of the isolator are respectively provided with a concave structure and a convex structure and are aligned during assembly, and when the carrier rotates axially by utilizing the structure, the inner ring and the outer ring of the isolator form interlocking, so that the stability of the inertial sensor assembly measuring coordinate system is ensured. Be equipped with the elastomer between the outer ring in the isolator, and utilize the special cross-sectional design of elastomer, avoid the metallic collision when guaranteeing stable in structure, realize the vibration isolation of six degrees of freedom.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides an impact-resistant vibration-damping structure and a vibration-damping system of an internally-installed, omnidirectional vibration-damping and impact-resistant micro-inertia measurement unit.

Impact-resistant damping systems applied to micro-inertial measurement units can be generally classified into two categories: the vibration reduction device comprises external vibration reduction and internal vibration reduction, wherein a peripheral isolation structure is required to be added for the external vibration reduction, the vibration reduction device is usually applied to an environment with abundant installation space, and the assembly complexity is relatively low; inside damping is based on little inertial measurement unit's original structure usually, utilizes the damping part to suspend electronic system (mainly for little inertial sensor part) in the air, perhaps increases the elastic damping material and avoids intermetallic linking firmly completely, realizes vibration isolation or decay, and inside damping is applicable to the installation environment that the space is narrow and small, but the assembly is comparatively complicated usually.

In order to solve the technical problems, the technical scheme adopted by the invention is as follows:

an impact-resistant vibration damping structure of a micro-inertia measurement unit is used for damping a micro-inertia module supported by a support frame and comprises a vibration isolator arranged on the support frame;

the support frame adopts a hexahedral frame structure, and eight vertex angles of the hexahedral frame structure are respectively provided with a vibration isolator;

the vibration isolator is a pair of mutually matched silicon rubber shock pads formed by dividing a dividing surface.

Further, the two silicone rubber shock-absorbing pads in each pair of mutually matched silicone rubber shock-absorbing pads have different damping coefficients.

Furthermore, the silicon rubber shock pads are wedge-shaped, and each pair of silicon rubber shock pads are matched with each other by taking the wedge-shaped surfaces as partition surfaces.

Furthermore, the device also comprises a housing which can accommodate the vibration isolator, the support frame and the micro-inertia module in a matching way.

Furthermore, the supporting frame and/or the shell are made of metal materials.

Furthermore, spaces with inward chamfers are arranged on four supporting columns of the hexahedral frame structure, one silicon rubber shock pad in each vibration isolator is fixed at one top corner through an elastic fastener arranged in the space with the inner chamfers, and the other silicon rubber shock pad is attached to the silicon rubber shock pad through the adhesion between the dividing surfaces.

An impact resistant vibration damping system for a micro inertial measurement unit for damping vibration of a micro inertial module supported by a support frame, comprising: the vibration isolator is arranged on the supporting frame, and the shell can contain the vibration isolator, the supporting frame and the micro-inertia module which are arranged in an involutory manner;

the shock-proof protective shell is sleeved outside the shell and limits the shell in the base, and the cover plate covers the base;

the support frame adopts a hexahedral frame structure, and eight vertex angles of the hexahedral frame structure are respectively provided with a vibration isolator;

the vibration isolator is a pair of mutually matched silicon rubber shock pads formed by dividing a dividing surface;

the involutory shell is respectively sleeved with one buffer pad correspondingly.

Furthermore, the thicknesses of the cushion pads are different, and the thickness of the cushion pads sleeved on the bottom of the shell is larger than the thickness of the cushion pads sleeved on the side walls of the shell.

Further, a fit clearance for accommodating a cushion pad is arranged between the anti-impact protection shell and the outer shell.

Furthermore, a signal wire leading-out groove is reserved on the shell and the buffer pad.

Furthermore, the micro-inertia measurement unit is subjected to layered protection, vibration isolation is applied to the internal micro-inertia module, a cushion pad is applied between the micro-inertia module and the anti-impact protective shell, filling is applied between the anti-impact protective shell and the external metal shell of the micro-inertia measurement unit, and finally impact resistance vibration reduction of the micro-inertia measurement unit is achieved.

Internal micro inertial module applied vibration isolation: because the sensor of little inertia module comprises 3 MEMS accelerometers and 3 MEMS gyroscopes usually, and need to establish for the inertia measurement coordinate system of quadrature, consequently with the sensor assembly structure design of little inertia module for hexahedron frame form, adopt high strength aluminum alloy material, guarantee structural strength when lightening weight to carry out sensor distribution according to inertia measurement coordinate system axial requirement.

Further, for reducing the volume of little inertia module, carry out inside chamfer design with four support columns in the hexahedron frame construction, remain certain thickness as the mounting platform of vibration isolator based on last top surface and lower bottom surface to establish the installation through-hole at mounting platform, realize the fastening and spacing of vibration isolator. The vibration isolator is arranged in the inward chamfer space, so that the increase of the size of the micro-inertia module caused by the vibration isolator is reduced. In order to ensure reliable interconnection of the vibration isolator with the hexahedral frame structure and the metal shell, the vibration isolator and the mounting platform are fixed through fasteners respectively.

Further, the vibration isolator can be composed of a silicon rubber vibration damping pad, a fastener and a limiting structure. In order to realize the vibration isolator with small volume and excellent vibration isolation performance, the silicon rubber vibration damping pad of the vibration isolator is designed with a special structure. The silicon rubber vibration- damping pad 33, 34 of each vibration isolator is composed of two special-shaped polyhedron structures which are mutually matched, and the vibration-damping pad is fixed on the upper top/lower bottom surface of the hexahedral metal frame and the corresponding plane of the metal shell of the micro inertial module through a fastener and a limiting structure. The silicon rubber damping pad of two abnormal shape polyhedrons that mutually support contacts the cut-off face of laminating is isosceles trapezoid face, and this isosceles trapezoid face inclines to set up, and the oblique angle design is 45, can be so that the even decomposition of branch vibration stress of level or vertical direction, also can be according to the practical application environment, and the vibration stress that bears in each axial is different promptly, and the inclination is rationally designed to reach best damping effect. And the two mutually matched silicon rubber damping pads of the special-shaped polyhedron can be designed into different damping coefficients, and the damping effect is improved on the basis of not changing the original structural design because the vibration stress can be attenuated to a larger extent when being transmitted through different medium surfaces.

Furthermore, in order to ensure the same vibration damping effect in all axial directions and reduce the unequal rigidity of three axes, the metal shell of the micro-inertia module adopts a hexahedral shell and a cover plate form with the top surface removed, wherein the bottom of the shell is square, four vibration isolators are respectively arranged on the upper top surface and the lower bottom surface of the hexahedral metal frame, a certain pressure is pre-applied, the vibration isolators and the metal shell of the micro-inertia module are ensured to be closely and reliably interconnected, and the full axial vibration attenuation inside the micro-inertia module is realized. The invention is mainly described in the condition of volume limitation, partial structure of the vibration isolator is placed in the hexahedral metal frame by utilizing the inward chamfer design of the hexahedral metal frame, and the space requirements of isolation and vibration attenuation are reduced.

Furthermore, the micro-inertia module realizes internal vibration isolation and performs impact resistance protection after assembly is completed. As the shock resistance protection measure is that the cushion pads are added among the base, the shock resistance protection shell and the micro inertia module of the micro inertia measurement unit, the design of the shock resistance protection shell and the base of the micro inertia measurement unit is carried out correspondingly according to the structural size of the metal shell of the inertia module, and the space size which needs to be reserved for the cushion pads is designed according to the application environment of the carrier. The acceleration impact mainly born by the micro-inertia measuring unit is axial overload along the launching direction in the launching process of the carrier, and certain lateral overload is accompanied. Therefore, the micro-inertia module is sleeved with a bearing type fully-enclosed cushion pad, the structure is an approximately square bowl-shaped structure with the upper part and the lower part separated, the bottom surface of the bearing lower cushion pad is relatively thicker, and the side surfaces and the upper cushion pad are relatively thinner. A gap is reserved between the upper cushion pad and the lower cushion pad, and the signal wire of the micro inertia module is led out by matching with the hole of the metal shell of the micro inertia module.

Further, because the blotter has certain viscoelasticity, for preventing that anti impact shell glues with the blotter in the assembling process and glues glutinous, lead to being difficult to the assembly, can paint proper amount talcum powder in impact-resistant protecting crust inner wall and blotter outside, improve assembly efficiency.

Further, in order to further increase the reliability of the shock-resistant vibration damping system, the micro-inertial measurement unit may be filled with potting. The buffer material is filled between the metal shell outside the micro-inertia module and the anti-impact protective shell, the strength of the fastener under a high dynamic environment is ensured, the internal electrical connection of the micro-inertia measuring unit is solidified, the combination degree between the micro-inertia module and the anti-impact protective shell is enhanced, and the system reliability of the micro-inertia measuring unit is improved.

The invention achieves the following beneficial effects:

the invention discloses an impact-resistant vibration-damping structure and a vibration-damping system of a micro-inertia measurement unit, which realize vibration damping and impact resistance of a micro-inertia module in a mode of combining the inside and the outside, can realize multiple attenuation of vibration, have good vibration effect and simple assembly, and are suitable for vibration damping under the condition of limited installation space environment.

Drawings

FIG. 1 is a schematic view of an impact resistant and vibration damping structure;

FIG. 2 is a schematic view of a micro-inertial module vibration isolation;

FIG. 3 is an exploded view of FIG. 2;

FIG. 4 is a schematic view of a micro inertial measurement unit damping system;

in the figure, the position of the upper end of the main shaft,

11: buffer cushion

111 lead-out groove

12: buffer cushion

21: metal shell

211 lead-out groove

22: metal shell

31: elastic fastener

32: position limiting piece

33: silicon rubber vibration damping pad

34: silicon rubber vibration damping pad

4: metal support frame

41: through hole

5: MEMS sensor circuit board

6: processor circuit board

1-6: micro-inertia module

7: cover plate

8: anti-impact protective shell

9: a base.

Detailed Description

The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.

Example 1

As shown in fig. 1 to fig. 3, the anti-impact vibration damping structure of the micro-inertia measurement unit in this embodiment is used for performing anti-impact vibration damping on the micro-inertia modules 1 to 6, and includes a vibration isolator disposed on the metal support frame 4, and the vibration isolator and the micro-inertia modules 1 to 6 have metal housings 21 and 22 disposed outside and capable of accommodating the space of these components. The micro inertial modules 1-6 essentially comprise a MEMS sensor circuit board 5 and a processor circuit board 6 mounted on a metal support frame 4.

In order to realize the measurement of the inertia parameters with six degrees of freedom, the metal support frame 4 for assembling the inertia measurement circuit is of an approximate hexahedron frame structure, and the orthogonality of a measurement coordinate system is ensured. Four support columns of the hexahedral frame structure are designed to be chamfered inwards, and mounting platforms with through holes 41 are arranged on the upper top surfaces and the lower bottom surfaces of the four support columns, so that assembly spaces and matching structures are reserved for the vibration isolators.

Each vibration isolator includes a pair of cooperating silicone rubber shock pads divided by a dividing surface. In the present embodiment, only one pair of silicone rubber shock absorbing pads 33 and 34 is taken as an example for explanation. The silicon rubber shock absorption pads 33 and 34 are used as main components for attenuating and isolating vibration, wherein the silicon rubber shock absorption pad 33 is screwed and assembled with the elastic fastener 31 by penetrating the limiting piece 32 through the mounting table with the through hole 41, is fixed on the mounting table at the supporting column, and is provided with gaps with the metal shell 22 at the periphery, so that circuit board devices in the micro-inertia modules 1-6 are prevented from colliding with the metal shell 22 due to vibration displacement. The other silicone rubber shock pad 34 matched with the silicone rubber shock pad 33 is attached to the silicone rubber shock pad 33 through the adhesion between the divided surfaces, and the outer wall of the silicone rubber shock pad 34 is in contact attachment with the inner wall of the metal shell 22. The elastic fastener 31 can play a role in fastening the silicon rubber shock absorption pad 33 and has better anti-vibration performance.

The traditional silicon rubber vibration damping pad absorbs or attenuates the vibration or displacement transmitted to a damped system from the outside by utilizing the damping characteristic of the material and the deformation of the original structure of the vibration damping material. Since vibration can be understood as stress superimposed by various frequencies or response caused by excitation, and stress is transmitted in a medium in the form of waves, stress waves are attenuated continuously due to the damping effect of the damping material-silicon rubber during the transmission process of the damping material. In order to realize better vibration isolation performance, the structure of the silicon rubber vibration damping pad is specially designed, and the T-shaped or hemispherical structural form of the traditional silicon rubber vibration damping pad is overturned. And (4) carrying out a separated design on the silicon rubber damping pad. Namely, the silicon rubber shock absorption pads arranged on the upper top surfaces and the lower bottom surfaces of the four supporting columns are divided by adopting a dividing surface to form two wedge-shaped silicon rubber shock absorption pads which are mutually matched. Because the stress wave has attenuation in the propagation process of the medium, and the stress wave also has transmission, reflection and attenuation when being transmitted at the interface of different media or the variable cross section of the same medium. Therefore, the two approximate wedge-shaped silicon rubber vibration damping cushions are closely matched through the inclined design of the dividing surfaces, the two silicon rubber vibration damping cushions which are matched with each other can be designed into different damping coefficients, the transmission of vibration stress can be further attenuated, and the capability of vibration isolation or attenuation of the vibration damping cushions is improved under the condition that the size of the original vibration damping cushions is not changed. Meanwhile, the design of the inclined angle division surface is added to the silicon rubber vibration damping pad, so that the effect of vibration isolation by utilizing force decomposition is achieved. Because the material of the silicon rubber has stronger adhesiveness, the two parts of the silicon rubber damping pads are adhered together, and a larger adhesive force is generated between the two parts of the silicon rubber damping pads. When the vibration is transmitted to the micro-inertia modules 1-6, firstly, the vibration is attenuated by the damping characteristic of the material of the silicon rubber vibration damping pad; then, when the vibration stress is transmitted to the split surfaces of the pair of silicon rubber vibration damping pads in the form of waves, the second attenuation is carried out by utilizing the variable cross sections of different media and the decomposition of the force; and finally, when the vibration stress is transmitted to the rubber pads of the metal support frame 4 of the micro-inertia module, if the residual vibration stress is still large, the two silicon rubber vibration reduction pads at the variable cross section form a certain movement trend due to extrusion or stretching, further deformation or synchronous relative displacement is formed, and the vibration is attenuated for the third time.

Example 2

As shown in fig. 1 to 4, based on embodiment 1, the impact-resistant damping system of the inertial measurement unit in this embodiment includes: the micro inertia module comprises bearing type fully-enclosed buffer pads 11 and 12 arranged outside the micro inertia modules 1 to 6, an anti-impact protection shell 8 which is used for installing the micro inertia modules 1 to 6 in a base and plays a role of protection, a cover plate 7 and the like.

The micro-inertia module is internally subjected to vibration isolation or attenuation, and two oppositely-combined metal shells 21 and 22 outside the micro-inertia module are respectively and correspondingly sleeved with a bearing type fully-enclosed cushion pad 11 and 12, so that a measure for resisting high overload impact is formed between the micro-inertia module and the anti-impact protective shell 8.

The high overload shock concerned by the micro-inertia module usually occurs in the carrier launching process, is an acceleration shock with a certain pulse width, and is characterized by short time and large energy, and the process usually has an acceleration shock peak with extremely narrow pulse width which is difficult to capture, and both of the acceleration shock peak and the acceleration shock peak cause risks to the normal operation of the micro-inertia measurement unit. Most of the prior art approaches are to add a cushion pad and eliminate acceleration impact peaks. But is limited by the volume limit of the micro-inertia measurement unit, so that the compression stroke of the cushion pad is short, the deformation is small, and the response and the buffering effect to acceleration impact with a certain pulse width are not ideal. According to the invention, through the design of the bearing type fully-enclosed cushion pads 11 and 12, the impact-resistant protective shell 8 and the metal shells 21 and 22 outside the micro-inertia modules 1 to 6, the acceleration impact peak and the acceleration impact with a certain pulse width are effectively protected under the short-stroke buffer condition, and the normal work of the micro-inertia modules is ensured. Firstly, according to the structure and the size of the metal shell of the micro-inertia module, the impact-resistant protection shell 8 and the metal shell are designed to be matched with each other in a certain clearance, and the clearance is the installation space of the bearing type full-surrounding cushion pads 11 and 12. Namely, the impact-resistant protective shell 8 and the metal shells 21 and 22 outside the micro-inertia modules 1 to 6 surround and fasten the micro-inertia modules in a manner of pre-compressing the buffer pads 11 and 12, and perform buffer protection. Because acceleration impact load mainly follows carrier launching direction, and is accompanied with certain side impact, consequently when design fit clearance, the clearance of bottom loading face is great, and the clearance of remaining face is less for the blotter in main impact direction is thick enough, and has great compression stroke.

For further increasing the compression stroke of blotter, carry out special fluting design with metal casing 21 of little inertia module to the cooperation design blotter 11, 12 bottom structures for when the blotter bears acceleration impact load, at first have the compression stroke on receiving the impact direction, then guide the deformation of blotter to all around, radially expand. Therefore, due to the expansion of the transverse dimension, the compression stroke of the buffer cushion can be further increased, and the effect of protecting the impact with certain pulse width acceleration is achieved. In order to ensure that the micro-inertia module measures the axial stability when the carrier rotates at a high speed, the side external outline of the silicon rubber vibration damping pad on the periphery of the micro-inertia module and the metal shell are both designed to be of an approximate right-angle edge structure with a chamfer, so that the structural positioning is realized, and the silicon rubber vibration damping pad and the external metal shell are prevented from rotating relatively under the high-rotation state of the carrier.

In order to improve the torsion resistance of the internal micro-inertia module in the high rotation state of the carrier, the buffer pad is matched with the external shape similar to a cube, a groove 91 is formed in the internal bottom surface of the base 9 of the micro-inertia measurement unit, and the micro-inertia module of which the lower part is wrapped by the buffer pad is embedded into the groove 91 of the bottom shell of the micro-inertia measurement unit. Specially processing the slot into an approximate regular quadrangular frustum pyramid structure, namely, performing interference fit on the top surface of the slot and the micro inertia module wrapping the cushion pad for fastening the micro inertia module; the bottom surface of the slot 91 has a size larger than that of the lower cushion pad 12, leaving a space. The inner side wall of the base around the notch is provided with a threaded hole. When the micro-inertia module receives acceleration overload, the micro-inertia module axially presses the lower cushion pad, so that the bottom surface of the cushion pad is compressed and deformed. The design of regular quadrangular frustum pyramid fluting in the base 9, with the compressive deformation of blotter to the space development all around, increase the compression stroke that the blotter bore the weight of the direction to improve little inertia measuring unit's buffering, shock resistance. Meanwhile, the micro-inertia module is further fixed by utilizing the anti-impact protective shell 8 and the buffer pad 11 on the upper portion, the anti-impact protective shell 8 is designed into a hexahedral sleeve form by matching with the buffer pad, and the bottom of the outer surface of the anti-impact protective shell 8 is provided with a mounting flange 81 with a fixing hole. The mounting holes of the mounting flange 81 cooperate with threaded holes 92 in the inner side wall of the base 9. The metal shell outside the micro-inertia module is wrapped by the upper cushion pad and the lower cushion pad and is embedded into the groove of the base of the micro-inertia measuring unit, the bottom surface of the cushion pad is completely attached to the bottom surface of the groove, then the anti-impact protective shell is distributed according to the fixing holes, and the anti-impact shell is fixed in the groove of the base of the micro-inertia measuring unit through the matching of the fastening piece and the threaded hole in the inner side wall of the base.

In order to reduce the assembly difficulty of the buffer structure part and consider the information interconnection between the micro-inertia module and other systems of a carrier, a signal wire of the micro-inertia module is led out through an electrical interface through a metal shell of the micro-inertia module, a full-surrounding bearing type buffer pad is designed into an upper and lower covering structure, signal wire leading-out grooves 211 and 111 are reserved on any metal shell 21 and any buffer pad 11, and the signal wire is interconnected with a connector of the metal shell outside the micro-inertia module or thrown out in a wiring harness mode.

The other structure is the same as embodiment 1.

The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.

Claims (8)

1. An impact-resistant vibration-damping structure of a micro-inertia measurement unit is used for damping a micro-inertia module supported by a support frame and is characterized by comprising a vibration isolator arranged on the support frame;

the support frame adopts a hexahedral frame structure, and eight vertex angles of the hexahedral frame structure are respectively provided with a vibration isolator;

the vibration isolator is a pair of mutually matched silicon rubber shock pads formed by dividing a dividing surface; two silicon rubber shock absorption pads in each pair of mutually matched silicon rubber shock absorption pads have different damping coefficients;

the four support columns of the hexahedral frame structure are provided with spaces with inward chamfers, one silicon rubber shock pad in each vibration isolator is fixed at one top corner through an elastic fastener arranged in the space with the inward chamfers, and the other silicon rubber shock pad is attached to the silicon rubber shock pad through the adhesion between the dividing surfaces.

2. The micro inertial measurement unit impact-resistant and vibration-damping structure according to claim 1, wherein the silicon rubber vibration-damping pads are wedge-shaped, and each pair of silicon rubber vibration-damping pads are matched with each other by using a wedge-shaped surface as a dividing surface.

3. The impact-resistant and vibration-damping structure of the micro-inertia measurement unit as claimed in claim 1, further comprising a housing capable of accommodating the vibration isolator, the support frame and the micro-inertia module.

4. The micro inertial measurement unit impact-resistant and vibration-damping structure according to claim 3, wherein the support frame and/or the housing are made of metal.

5. The utility model provides a little inertia measuring unit shock attenuation system that shocks resistance for to the little inertia module damping that is supported by the support frame, characterized by includes: the vibration isolator is arranged on the supporting frame, and the shell can contain the vibration isolator, the supporting frame and the micro-inertia module which are arranged in an involutory manner;

the shock-proof protective shell is sleeved outside the shell and limits the shell in the base, and the cover plate covers the base;

the support frame adopts a hexahedral frame structure, and eight vertex angles of the hexahedral frame structure are respectively provided with a vibration isolator;

the vibration isolator is a pair of mutually matched silicon rubber shock pads formed by dividing a dividing surface;

the involutory shells are respectively sleeved with one buffer pad correspondingly; two silicon rubber shock absorption pads in each pair of mutually matched silicon rubber shock absorption pads have different damping coefficients; the four support columns of the hexahedral frame structure are provided with spaces with inward chamfers, one silicon rubber shock pad in each vibration isolator is fixed at one top corner through an elastic fastener arranged in the space with the inward chamfers, and the other silicon rubber shock pad is attached to the silicon rubber shock pad through the adhesion between the dividing surfaces.

6. The system of claim 5, wherein the cushions are of a non-uniform thickness and are disposed around the bottom of the housing to a thickness greater than the thickness of the cushions around the sidewalls of the housing.

7. The system of claim 5 or 6, wherein a fit clearance for accommodating a cushion pad is provided between the impact-resistant protective shell and the outer shell.

8. The system of claim 5, wherein the housing and the buffer pad are provided with signal wire lead-out grooves.

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