CN211178507U - Inertia measurement assembly - Google Patents

Abstract

The utility model discloses an inertia measurement assembly, include: the table body structure comprises a middle body with a middle cavity and four bosses which take the middle body as a center and form a cross structure with the middle body; the outer end faces of the four bosses are respectively provided with a damping structure mounting position; the outer shell is enveloped outside the side wall of the platform body structure in a sleeve mode, and the outer peripheral wall of the outer shell is provided with mounting holes which correspond to the positions of the four shock absorption structure mounting positions one by one; and the connecting piece penetrates through the mounting hole and is connected to the corresponding damping structure mounting position, and is used for connecting the platform body structure to the outer shell. The four bosses which are arranged in a cross shape can realize the spatial diagonal layout of the installation positions of the damping structure, and ensure that the spans of four damping supporting points of the outer shell and the platform body structure in a reference coordinate system are consistent; realize the unity of "damping support center" and "barycenter" of stage body structure, geometric center, under the prerequisite of guaranteeing inertia measurement assembly structural strength and measurement accuracy, realized lightweight and miniaturized design.

Description

Inertia measurement assembly

Technical Field

The utility model relates to an inertia measurement subassembly belongs to navigation, guidance and control technical field for the acceleration and the rotation angular rate of measurement carrier are applicable to position attitude system and strapdown inertial navigation system.

Background

The inertial measurement unit is an inertial measurement unit based on a gyroscope and an accelerometer, and is commonly used in inertial navigation or combined navigation systems. The inertial measurement unit generally consists of an inertial sensor, an assembly support structure and a corresponding electronic circuit; the working principle of the method is that an inertial sensor (a gyroscope and an accelerometer) is utilized to establish a spatial inertial measurement coordinate system, namely, the gyroscope is used for measuring angular velocity, the accelerometer is used for measuring acceleration, dynamic parameters of a moving carrier are obtained, and attitude information of the moving carrier is obtained through integral and navigation algorithm calculation. Generally, the inertia measurement assembly is often applied to complex and severe working environments, and particularly, the inertia sensing assembly is adapted to high overload impact, vibration and the like in some special application environments.

The inertia measurement assembly not only needs to utilize a specially designed assembly support structure to realize the triaxial orthogonal relationship between the sensitive axes of the sensor, but also meets the freedom requirement of inertia measurement; it is further contemplated to provide support and protection to the mounting support structure to increase the high overload resistance of the mounting support structure.

The chinese utility model patent with publication number CN108692723A discloses a micro-inertia measurement assembly structure with high overload resistance, the support structure is a hexahedral structure with a hollow middle part formed by support edges, the outer shell adopts the form of upper and lower shells, the upper and lower shells are fixedly connected by screws, the hexahedral frame structure of the inertia measurement assembly is fixedly connected with the lower shell by screws; under the prerequisite that satisfies the volume restriction, suitably increase the lateral wall thickness of lower part casing, for the hexahedron frame construction of inertia measurement component provides support and protection, structural design is novel, easily assembly operation, satisfies anti high overload demand when realizing miniaturized design.

However, the hexahedral frame structure is fixedly coupled to the lower case by means of coupling screws installed at the bottom of the lower case, the lower case transmits the vibration of the external device to the hexahedral frame structure, and the hexahedral frame structure exhibits anisotropic dynamic characteristics under impact and vibration conditions, thereby affecting the measurement accuracy of the inertial sensor on the hexahedral frame structure.

Therefore, it is necessary to design an inertial measurement unit that can achieve high integration and small volume through reasonable layout while ensuring the installation and measurement accuracy of the inertial measurement unit.

SUMMERY OF THE UTILITY MODEL

Therefore, the to-be-solved technical problem of the utility model lies in overcoming among the prior art hexahedron frame construction of inertia measurement component and the connected mode between the shell body and be difficult to satisfy miniaturization and high accuracy measurement's problem simultaneously to an inertia measurement component is provided.

In order to solve the technical problem, the technical scheme of the utility model as follows:

an inertial measurement unit comprising:

the table body structure is a hexahedral structure which is enclosed by a bottom wall and side walls to form a middle cavity, and comprises a middle body positioned in the middle and four bosses which take the middle body as a center, respectively extend outwards from four edges of the middle body which extend longitudinally and form a cross structure with the middle body; the four bosses are provided with shock absorption structure mounting positions on the outer end faces back to the middle cavity;

the outer shell is wrapped outside the side wall of the platform body structure in a sleeve mode, and the outer peripheral wall of the outer shell is provided with mounting holes which correspond to the four mounting positions of the damping structure one by one;

and the connecting piece penetrates through the mounting hole and is connected to the corresponding damping structure mounting position, and is used for connecting the platform body structure to the outer shell.

Further, the shock-absorbing structure installation site includes:

the connecting seat is connected to the outer end face, back to the middle cavity, of the boss, and a through hole is formed in the middle of the connecting seat;

the connecting column is arranged in the through hole, and is provided with a connecting hole for connecting with the connecting piece;

and the shock pad is sleeved on the periphery of the connecting column and elastically abuts against the connecting seat so as to connect the connecting column to the connecting seat.

Furthermore, the boss is back to the outer end face of the middle cavity, a mounting groove is formed in the outer end face of the middle cavity, the through hole of the connecting seat corresponds to the mounting groove, and one end of the connecting column extends into the mounting groove.

Furthermore, the connecting column is of a cylindrical structure with thick ends and thin middle, and the shock pad is tightly matched with the outer wall surface of the connecting column.

Further, the shell body comprises a lower shell body and a plurality of upper shell bodies sequentially connected above the lower shell body, the platform body is structurally installed on the lower shell body, and the upper shell bodies are connected with the lower shell body through fasteners.

Furthermore, a step structure is arranged at the top of the lower shell, and the bottom end of the upper shell is matched with the step structure.

Furthermore, the inner wall of the lower shell is provided with four mounting platforms which correspond to the mounting holes respectively, and the mounting platforms are of block structures protruding out of the inner wall surface of the lower shell.

Furthermore, the inner peripheral wall of the upper shell is provided with an installation ear hole structure for installing the circuit board.

Furthermore, the whole body of the outer shell is a cylindrical cylinder structure, and the outer side surface of the outer shell comprises a positioning plane and an arc surface.

Further, the shell body is provided with a connecting hole for connecting with an external component.

The utility model discloses technical scheme has following advantage:

1. the utility model provides an inertia measurement assembly, the hexahedron structure that designs the stage body structure into having middle cavity, and four bosss on the lateral wall of stage body structure use the midbody as the center and be the cross and extend outwards and form cross structure with the midbody, form the accommodation space that supplies inertial sensor installation between two adjacent bosss, thereby can realize the miniaturized design of stage body structure; meanwhile, the outer end faces of the four bosses, which are back to the middle cavity, are provided with damping structure mounting positions, the outer shell is fixed on the damping structure mounting positions of the four bosses through connecting pieces, so that the connection between the platform body structure and the outer shell can be realized, and the spatial diagonal layout of the damping structure mounting positions can be realized by the four bosses arranged in a cross manner, so that the consistent span of the four damping supporting points of the outer shell and the platform body structure in a reference coordinate system is ensured; the unity of the 'vibration reduction support center' and the 'mass center' and the 'geometric center' of the platform body structure after the inertial sensor is installed is realized, the isotropic dynamic characteristics are shown under the conditions of impact and vibration, and the measurement accuracy of the inertial measurement component under the conditions of high overload impact and vibration is ensured.

2. The utility model provides an inertia measurement subassembly, the spliced pole on the shock-absorbing structure installation position can realize rigid connection with the connecting piece, and the shock pad elasticity is supported and is pressed between connecting seat and spliced pole, plays certain fixed action to the spliced pole on the one hand, and on the other hand can offset the influence of partial external vibration to the stage body structure.

3. The utility model provides an inertia measurement subassembly, shell body adopt the assembly methods that casing and lower casing cup jointed each other, in the installation, can install stage structure under on the casing earlier to install the circuit board on last casing, go on again and go up casing and down the connection to inserting between the casing, at last rethread fastener will go up casing and casing fixed connection down, can effectively avoid the damage that causes circuit board and components and parts on it in the installation.

4. The utility model provides an inertia measurement subassembly, the lateral surface of shell body in addition the shell body bottom surface including location plane, conveniently realize the location installation of shell body and external component.

To sum up, the utility model provides an inertia measurement subassembly has that simple structure, material easily acquire, the processing cost is low, have the advantage that the quality is light, the size is little under the prerequisite that satisfies structural strength requirement, and overall structure is light and handy easily to install moreover.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic view of an overall structure of an inertial measurement unit according to an embodiment of the present invention;

fig. 2 is a schematic diagram of an overall structure of an inertial measurement unit according to an embodiment of the present invention, in which an upper case of an outer case is hidden to show an inner structure thereof;

FIG. 3 is a schematic view of the half-section of FIG. 2;

fig. 4 is a schematic overall structure diagram of the stage structure in the inertia measurement assembly according to the embodiment of the present invention;

fig. 5 is a schematic half-sectional view of the stage structure of fig. 4.

Description of reference numerals: 1. a platform body structure; 11. a bottom wall; 12. a side wall; 13. a boss; 131. mounting grooves; 2. an outer housing; 21. a lower housing; 211. mounting holes; 212. a step structure; 213. an installation table; 22. an upper housing; 221. mounting an ear hole structure; 23. positioning a plane; 24. connecting holes; 3. a shock-absorbing structure mounting position; 31. a connecting seat; 32. connecting columns; 33. a shock pad; 4. a fastener.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.

An inertial measurement unit, as shown in fig. 1-5, comprises a table structure 1 in a cross-shaped configuration and an outer casing 2 in the form of a sleeve enveloping the side wall 12 of the table structure 1. The platform body structure 1 is a hexahedral structure which is enclosed by a bottom wall 11 and side walls 12 to form a middle cavity, and the platform body structure 1 comprises a middle body positioned in the middle and four bosses 13 which take the middle body as a center, respectively extend outwards from four edges of the middle body extending longitudinally and form a cross structure with the middle body. All be equipped with shock-absorbing structure installation position 3 on the outer terminal surface of cavity in the middle of four bosss 13 dorsad, the mounting hole 211 with the position one-to-one of four shock-absorbing structure installation positions 3 is seted up to the periphery wall of shell body 2, boss 13 structure is connected in shell body 2 through four connecting pieces that run through mounting hole 211 respectively and be connected to the shock-absorbing structure installation position 3 that corresponds. In particular, the connecting element may be a locking screw.

The table body structure 1 is designed into a hexahedral structure with a middle concave cavity, four bosses 13 on the side wall 12 of the table body structure 1 extend outwards in a cross shape by taking the middle body as a center and form a cross structure with the middle body, and an accommodating space for installing an inertial sensor is formed between every two adjacent bosses 13, so that the miniaturization design of the table body structure 1 can be realized; meanwhile, the damping structure mounting positions 3 are arranged on the outer end faces of the four bosses 13 back to the middle cavity, the outer shell 2 is fixed on the damping structure mounting positions 3 of the four bosses 13 through connecting pieces, the connection between the platform body structure 1 and the outer shell 2 can be realized, the spatial diagonal layout of the damping structure mounting positions 3 can be realized through the four bosses 13 arranged in a cross shape, and the consistent span of the four damping supporting points of the outer shell 2 and the platform body structure 1 in a reference coordinate system is ensured; the unification of the 'vibration reduction support center' and the 'mass center' and the 'geometric center' of the platform body structure 1 after the inertial sensor is installed is realized, the isotropic dynamic characteristics are shown under the conditions of impact and vibration, and the measurement accuracy of the inertial measurement component under the conditions of high overload impact and vibration is ensured.

In this embodiment, the shock-absorbing structure mounting site 3 includes a connecting seat 31, a connecting post 32 and a shock-absorbing pad 33. The connecting socket 31 is connected to the outer end face of the boss 13 facing away from the middle cavity, and a through hole is formed in the middle of the connecting socket. The connecting post 32 is disposed in the through hole and has a connecting hole 24 for connecting with the connecting member. The shock absorbing pad 33 is sleeved on the periphery of the connecting post 32 and elastically abuts against the connecting seat 31, so as to connect the connecting post 32 to the connecting seat 31. The spliced pole 32 on the shock-absorbing structure installation position 3 can realize rigid connection with the connecting piece, and the cushion 33 elasticity is supported and is pressed between connecting seat 31 and spliced pole 32, plays certain fixed action to spliced pole 32 on the one hand, and on the other hand can offset the influence of partial outside vibration to stage body structure 1.

In this embodiment, the outer end surface of the boss 13 facing away from the middle cavity is provided with a mounting groove 131, the through hole of the connecting seat 31 corresponds to the mounting groove 131, and one end of the connecting post 32 extends into the mounting groove 131. The design of mounting groove 131 on the outer terminal surface of boss 13 not only can alleviate the holistic weight of stage body structure 1, still provides installation space for spliced pole 32, makes stage body structure 1 compacter, is favorable to realizing the lightweight of stage body structure 1 and miniaturized design.

Specifically, the connecting column 32 is a cylindrical structure with thick ends and thin middle, and the damping pad 33 is tightly matched with the outer wall surface of the connecting column 32 and is fixedly connected to the connecting seat 31. The shock absorption pad 33 with the structure can realize the shock absorption effect along the longitudinal axis direction of the table body structure 1, and the four shock absorption pads 33 are also arranged in a cross structure, so that the unification of a 'shock absorption supporting center' and a 'mass center' and a 'geometric center' of the table body structure 1 can be realized, and the measurement accuracy of the inertia measurement assembly under the conditions of high overload impact and vibration is ensured.

In this embodiment, the outer casing 2 is a cylindrical structure integrally, and includes a lower casing 21 and a plurality of upper casings 22 sequentially connected to the upper side of the lower casing 21, the stage structure 1 is installed on the lower casing 21, the plurality of upper casings 22 are connected to the lower casing 21 through fasteners 4, and the upper casing 22 is used for installing a circuit board. Specifically, the fastening member 4 includes four set screws penetrating through a plurality of upper and lower cases 22 and 21, and there are three upper cases 22. It will be appreciated herein that the number and height of the upper housing 22 may be adapted depending on the number and size of circuit boards required to be mounted within the inertial measurement unit.

The outer shell 2 adopts the assembly mode that the upper shell 22 and the lower shell 21 are mutually sleeved, in the installation process, the platform body structure 1 can be installed on the lower shell 21 firstly, a circuit board is installed on the upper shell 22, then the upper shell 22 and the lower shell 21 are connected in an inserting mode, finally the upper shell 22 and the lower shell 21 are fixedly connected through the fastening piece 4, and the circuit board and the components and parts on the circuit board can be effectively prevented from being damaged in the installation process.

In this embodiment, the top of the lower housing 21 is provided with a step structure 212, and the bottom of the upper housing 22 is matched with the step structure 212. Go up casing 22 and lower casing 21 and carry out the mode of assembling through stair structure 212, make things convenient for both to fix rethread fastener 4 after inserting to can improve shell body 2 overall structure's stability. Of course, a similar step structure 212 can be used for the butt joint between two adjacent upper shells 22. The inner peripheral wall of the upper shell 22 is also provided with an installation ear hole structure 221 for fixedly installing the circuit board.

In this embodiment, four mounting bases 213 are provided on the inner wall of the lower case 21, the four mounting bases 213 corresponding to the positions of the mounting holes 211, respectively, and the mounting bases 213 are block-shaped structures protruding from the inner wall of the lower case 21. The design of the block structure protruding inward on the inner wall of the lower shell 21 can improve the structural strength of the part of the lower shell 21 provided with the mounting hole 211, thereby reducing the possibility that the connecting piece penetrating through the mounting hole 211 on the lower shell 21 damages the structure of the lower shell 21 in the vibration process.

In this embodiment, the outer peripheral surface of outer casing 2 includes location plane 23 and arc surface, and location plane 23 on the outer peripheral surface of outer casing 2 is convenient to realize the location installation of outer casing 2 and external component in addition to the bottom surface of outer casing 2. The outer case 2 is further provided with a connection hole 24 for connecting an external member.

To sum up, the embodiment of the present invention provides an inertia measurement assembly, wherein a damping structure mounting position 3 is disposed on the outer end surface of four bosses 13 facing away from the middle cavity, the outer housing 2 is fixed on the damping structure mounting positions 3 of the four bosses 13 through connecting members, so that the connection between the stage structure 1 and the outer housing 2 can be realized, and the four bosses 13 arranged in a cross shape can realize the spatial diagonal layout of the damping structure mounting positions 3, thereby ensuring the consistency of the span of the four damping support points of the outer housing 2 and the stage structure 1 in the reference coordinate system; the unity of the 'vibration reduction supporting center' and the 'mass center' and the 'geometric center' of the platform body structure 1 after the inertial sensor is installed is realized, the isotropic dynamic characteristics are shown under the conditions of impact and vibration, and the measurement accuracy of the inertial measurement component under the conditions of high overload impact and vibration is ensured; and concrete simple structure, material easily acquire, the processing cost is low, have the advantage that the quality is light, the size is little under the prerequisite that satisfies structural strength requirement, overall structure is light and handy easily to be installed moreover.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications can be made without departing from the scope of the invention.

Claims (10)

1. An inertial measurement assembly, comprising:

the table body structure (1) is a hexahedral structure which is enclosed by a bottom wall (11) and a side wall (12) to form a middle cavity,

the table body structure (1) comprises a middle body positioned in the middle and four bosses (13) which take the middle body as a center, respectively extend outwards from four edges of the middle body extending longitudinally and form a cross structure with the middle body; the four bosses (13) are provided with shock absorption structure mounting positions (3) on the outer end faces back to the middle cavity;

the outer shell (2) is wrapped outside the side wall (12) of the platform body structure (1) in a sleeve mode, and the outer peripheral wall of the outer shell is provided with mounting holes (211) which correspond to the four shock absorption structure mounting positions (3) one by one;

and the connecting piece penetrates through the mounting hole (211) and is connected to the corresponding damping structure mounting position (3) and is used for connecting the table body structure (1) to the outer shell (2).

2. Inertial measurement unit according to claim 1, characterized in that said shock-absorbing structure mounting location (3) comprises:

the connecting seat (31) is connected to the outer end face, back to the middle cavity, of the boss (13), and a through hole is formed in the middle of the connecting seat;

a connecting column (32) which is arranged in the through hole and is provided with a connecting hole (24) for connecting with the connecting piece;

and the shock absorption pad (33) is sleeved on the periphery of the connecting column (32) and elastically abuts against the connecting seat (31) so as to connect the connecting column (32) to the connecting seat (31).

3. An inertia measuring assembly according to claim 2, wherein the boss (13) has a mounting groove (131) formed on an outer end surface thereof facing away from the intermediate cavity, the through hole of the connecting seat (31) corresponds to the mounting groove (131), and one end of the connecting post (32) extends into the mounting groove (131).

4. The inertial measurement unit according to claim 2, characterized in that the connection column (32) is a cylindrical structure with thick ends and thin middle, and the shock absorbing pad (33) is tightly fitted to the outer wall surface of the connection column (32).

5. An inertial measurement unit according to claim 1, characterised in that the outer casing (2) comprises a lower casing (21) and a plurality of upper casings (22) connected in sequence above the lower casing (21), the stage structure (1) being mounted to the lower casing (21), the plurality of upper casings (22) and the lower casing (21) being connected by fasteners (4).

6. Inertial measurement unit according to claim 5, characterized in that the lower housing (21) is provided at the top with a step structure (212), the lower end of the upper housing (22) being fitted with the step structure (212).

7. The inertia measurement assembly of claim 5, wherein the inner wall of the lower housing (21) is provided with four mounting platforms (213) corresponding to the positions of the corresponding mounting holes (211), respectively, and the mounting platforms (213) are block-shaped structures protruding from the inner wall surface of the lower housing (21).

8. An inertial measurement unit according to claim 5, characterised in that the inner peripheral wall of the upper housing (22) is provided with mounting ear hole formations (221) for circuit board mounting.

9. An inertial measurement unit according to claim 1, characterised in that the outer casing (2) is of generally cylindrical configuration, the outer side of which comprises the locating flat (23) and the circular arc.

10. An inertial measurement unit according to claim 1, characterised in that the outer casing (2) has a connection hole (24) for connection to an external member.

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