CN112377568B - Limiting and buffering device for inertial navigation - Google Patents

Limiting and buffering device for inertial navigation Download PDF

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Publication number
CN112377568B
CN112377568B CN202011324699.9A CN202011324699A CN112377568B CN 112377568 B CN112377568 B CN 112377568B CN 202011324699 A CN202011324699 A CN 202011324699A CN 112377568 B CN112377568 B CN 112377568B
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buffer
shaft
groove
inertial navigation
sleeve
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CN202011324699.9A
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CN112377568A (en
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王洁梅
王宝龙
封治顺
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Xi'an Sino Huaxin Measurement & Control Co ltd
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Xi'an Sino Huaxin Measurement & Control Co ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
    • F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
    • F16F15/04—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means
    • F16F15/08—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means with rubber springs ; with springs made of rubber and metal
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F2224/00—Materials; Material properties
    • F16F2224/02—Materials; Material properties solids
    • F16F2224/025—Elastomers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F2230/00—Purpose; Design features
    • F16F2230/0023—Purpose; Design features protective
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
    • G01C21/00—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00
    • G01C21/10—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00 by using measurements of speed or acceleration
    • G01C21/12—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00 by using measurements of speed or acceleration executed aboard the object being navigated; Dead reckoning
    • G01C21/16—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00 by using measurements of speed or acceleration executed aboard the object being navigated; Dead reckoning by integrating acceleration or speed, i.e. inertial navigation

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Vibration Dampers (AREA)

Abstract

The invention discloses two limiting buffer devices for inertial navigation, wherein the two limiting buffer devices are symmetrically distributed on two sides of an inertial navigation system, each limiting buffer device comprises a buffer shaft and a buffer groove, the buffer shaft comprises an inner platform body installation shaft, a pressing plate and a buffer sleeve sleeved on the inner platform body installation shaft, the buffer sleeve is of a hollow cylindrical structure, a groove for installing the pressing plate is formed in the center position of the upper surface of the buffer sleeve, and the pressing plate is fixed with the inner platform body installation shaft through a screw; the inner table body is connected with the base through a plurality of vibration absorbers, a buffer groove used for containing the buffer shaft is formed in the inner side wall of the base, the buffer groove comprises a U-shaped groove and pressing strips, two arms of the U-shaped groove are respectively inserted into two sides of the buffer shaft, and the U-shaped groove is connected with the pressing strips capable of sealing the buffer shaft.

Description

Limiting and buffering device for inertial navigation
Technical Field
The invention relates to the field of inertial navigation systems, in particular to a limiting and buffering device for inertial navigation.
Background
The inertial navigation system is a core system for navigation and control of the carrier, and can accurately position the geographical position and the traveling speed of the carrier. The inertial navigation system with accuracy, rapidness and strong anti-interference capability plays an important role and significance in the actual use process. The most basic core component of the inertial navigation system is an inner stage body (composed of a sensitive inertial device gyroscope and an accelerometer), and the working precision of the inner stage body determines the precision of the inertial navigation system. Therefore, the reliability and the working precision of the inner table body are guaranteed as the first prerequisites. The working precision of the inner stage body cannot be lost due to external vibration and other mechanical conditions, although the system can compensate various errors, the system can be brought with remarkable dynamic errors under the vibration environment, and the sensor can be damaged under the resonance condition, so that the application of the inertial navigation system is directly influenced. Therefore, a vibration absorber (a low-pass filtering method) is required to be used for inhibiting the system error of the inertia device, so that the damage of the inertia device caused by external vibration is avoided, and the error of the inertia device and the system error caused by vibration are reduced.
Because the shock absorber that inertial navigation system used is the metal rubber shock absorber, under vibration or impact condition, the metal rubber shock absorber can have the too big risk of stroke, will lead to the shock absorber rubber part to tear or come unstuck, just can produce rigid collision between interior stage body and the base, leads to inertial device to damage or increase extra error, causes certain influence or function loss to inertial navigation system's performance. In order to prevent the occurrence of the faults, a limit buffer device is adopted to limit the overlarge stroke of the shock absorber.
The used spacing buffer of prior art mainly has following defect: 1. the limit buffer device adopted by the inertial navigation system uses more buffer parts made of silicon rubber, so that the economic cost caused by the cost of a die and parts is increased; 2. the limiting device is a thin-wall part, has deformation risk in the movement process and is only suitable for limiting and buffering the inner platform body with light weight; 3. in dynamic work, the extruded buffer sleeve has no limit protection measures, and the buffer sleeve has displacement risks.
Disclosure of Invention
The invention aims to provide a limiting and buffering device for inertial navigation, which is used for limiting dynamic displacement of an internal shock absorber and an inner platform body of the inertial navigation so as to solve the problem that important inertial devices on the inner platform body are damaged or fail due to rigid collision between the inner platform body and a base caused by damage of rubber of a metal rubber shock absorber in a dynamic working state such as vibration or impact.
In order to achieve the purpose, the invention adopts the following technical scheme:
the two limiting buffer devices are symmetrically distributed on two sides of an inertial navigation system, each limiting buffer device comprises a buffer shaft and a buffer groove, the buffer shaft comprises an inner platform body installation shaft, a pressing plate and a buffer sleeve sleeved on the inner platform body installation shaft, the buffer sleeve is of a hollow cylindrical structure, a groove for installing the pressing plate is formed in the center of the upper surface of the buffer sleeve, and the pressing plate is fixed with the inner platform body installation shaft through screws; the inner table body is connected with the base through a plurality of vibration absorbers, a buffer groove used for containing the buffer shaft is formed in the inner side wall of the base, the buffer groove comprises a U-shaped groove and pressing strips, two arms of the U-shaped groove are respectively inserted into two sides of the buffer shaft, and the U-shaped groove is connected with the pressing strips capable of sealing the buffer shaft.
Further, the distances from the inner sides of the two arms of the U-shaped groove, the bottom surface of the U-shaped groove and the inner side of the pressing strip to the excircle of the buffer sleeve are equal.
Further, the distance between the upper surface of the buffer sleeve and the inner side surface of the buffer groove is equal to the distance between the inner side of the pressing strip and the excircle of the buffer sleeve.
Furthermore, the limiting buffer device is positioned in the space center of the plurality of shock absorbers between the inner table body and the base.
Further, the buffer sleeve is made of silicon rubber.
Further, the pressing plate is made of a titanium alloy material.
Furthermore, the pressing strip is made of stainless steel.
Further, U type groove and base structure as an organic whole.
Furthermore, the depth of a groove for installing the pressing plate on the buffer sleeve is greater than the sum of the thickness of the flange plate of the pressing plate and the compression amount generated by the upper surface of the buffer sleeve in the dynamic displacement process.
Further, the distance between the mounting surface of the shock absorber on the inner platform body and the outer side surface of the U-shaped groove is larger than the compression amount generated by the upper surface of the buffer sleeve in the dynamic displacement process.
Compared with the prior art, the invention has the following beneficial technical effects:
under the condition of dynamic working of a product, the shock absorber can generate dynamic displacement along with the movement of the inner platform body, when the inner platform body generates violent displacement due to external environmental conditions, the rubber part of the shock absorber can be torn or loses efficacy, after the shock absorber loses efficacy or is torn, the product base and the inner platform body are in rigid collision with each other, important sensors and sensitive components lose efficacy, in order to avoid the faults, a limiting buffer device needs to be added in the product, and in the process that the inner platform body moves in all directions, the limiting buffer device can limit the inner platform body at a certain distance.
The buffer sleeve is installed in a tight fit mode with the installation shaft of the inner table body, and is protected in a tabletting mode, so that the buffer sleeve is effectively prevented from displacing in dynamic work; the adopted buffer sleeve has simple structure, and saves the die and the production cost; the invention has the advantages of simple structure, high reliability, wide application range, simple process, easy realization and cost saving. By arranging 2 groups of limiting and buffering devices, when the inner table body moves in the left side direction, the upper surface of a buffering sleeve of the left limiting and buffering device and the inner side surface of a left U-shaped groove play a role in buffering; when the inner table body moves towards the right side, the upper surface of the buffer sleeve of the right side limiting buffer device and the inner side surface of the right side U-shaped groove play a role in buffering. When the inner platform body moves towards the radial direction of the shock absorber, the buffer sleeves on the two sides and the inner sides of the two arms of the U-shaped groove, the bottom surface of the U-shaped groove and the inner side of the pressing strip play a role in buffering.
Furthermore, the distance between each inner wall of the buffer groove and the excircle of the buffer shaft and the distance between the front end of the buffer shaft and the inner wall of the base are equal, and the limiting buffer device is positioned in the space center formed by the shock absorbers on the inner platform body, so that line angle coupling in dynamic work is avoided.
Furthermore, the U-shaped groove and the base are of an integrated structure, the buffer structure is reliable and stable in form, and the vibration impact buffer effect of the inner table body with various qualities is good.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a schematic sectional view of the installation of the structure of the present invention.
FIG. 3 is a schematic view of the mounting positions of the damper and the buffer shaft on the inner stage body according to the present invention;
fig. 4 is a schematic cross-sectional structure of the present invention.
Fig. 5 is an enlarged schematic view of the limiting and buffering device of the invention.
Fig. 6 is an enlarged view of the buffer shaft according to the present invention.
FIG. 7 is an enlarged view of the buffer tank according to the present invention.
The vibration absorber comprises an inner table body 1, a base 2, a limiting buffer device 3, a buffer shaft 4, a buffer groove 5, a buffer sleeve 6, a pressing plate 7, an inner table body mounting shaft 8, a U-shaped groove 9, a pressing strip 10 and a vibration absorber 11.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 1 to 7, a limit buffer device for inertial navigation, a limit buffer device 3 includes a buffer shaft 4 and a buffer groove 5. The buffer shaft 4 comprises a buffer sleeve 6, a pressure plate 7 and an inner table body mounting shaft 8, the buffer sleeve 6 is sleeved on the inner table body mounting shaft 8 and is pressed tightly by the pressure plate 7; the buffer slot 5 comprises a U-shaped slot 9 with a side wall and a pressing strip 10, and the pressing strip 10 is arranged at the top end of the U-shaped slot 9 to form a closed buffer slot 5. Buffering axle 4 is embedded in dashpot 5, and under dynamic operating condition, buffering axle 4 can take place the displacement along with the inner platform body 1 together, and buffering axle 4 moves certain stroke back this moment, and the buffer sleeve 6 of silicon rubber material can the elastic impact in the inboard of dashpot 5, has not only restricted 11 the stroke of shock absorber, and the cushioning effect that buffering axle 4 played also makes the inertial navigation system reduce a quantitative error.
The buffer shaft 4 consists of a buffer sleeve 6 made of silicon rubber, a pressing plate 7 and an inner platform body mounting shaft 8, the buffer sleeve 6 is of a shallow 'concave' structure, the pressing plate 7 is of a 'convex' structure, and the pressing plate 7 is mounted on the inner platform body mounting shaft 8 at the groove position of the buffer sleeve 6 by cross-groove countersunk head screws so as to fix the buffer sleeve 6 against relative displacement in the extrusion process; the top surface of the pressure plate 7 is lower than the top surface of the buffer sleeve 6, and the distance between the two surfaces is required to be larger than the dynamic displacement of the buffer sleeve 6; the pressing plate 7 is made of titanium alloy.
Buffer slot 5 comprises U type groove 9 and layering 10 two parts with 2 body structures of base, and layering 10 is installed and is constituting a confined buffer slot 5 on U type groove 9 top, layering 10 is stainless steel material, the distance between 5 inner walls of buffer slot apart from the distance of 6 excircles of cushion collar, 6 upper surface of cushion collar and 5 medial surfaces of buffer slot equals.
And the limiting buffer devices 3 are 2 groups in total and are symmetrically distributed on two sides of the inertial navigation system.
The invention is further described in detail below with reference to specific example procedures:
the limiting and buffering device 3 comprises a buffering shaft 4 and a buffering groove 5. The buffer shaft 4 comprises a buffer sleeve 6 made of silicon rubber, a pressing plate 7 made of titanium alloy and an inner platform body mounting shaft 8, the buffer sleeve 6 is of a shallow concave hollow structure and sleeved on the inner platform body mounting shaft 8, the pressing plate 7 is of a convex structure and is fixed at the groove position of the buffer sleeve 6, and the buffer sleeve 6 is mounted on the inner platform body mounting shaft 8 through screws so as to fix the relative displacement of the buffer sleeve 6 in the extrusion process.
The buffer slot 5 is composed of a U-shaped slot 9 and a pressing strip 10 which are integrated with the base 2, the pressing strip 10 is made of stainless steel, the buffer shaft 4 is installed on the inner table body 1 and is elastically connected with the base 2 through the shock absorber 11, and the pressing strip 10 is installed at the top end of the U-shaped slot 9 to form a closed buffer slot 5.
The distance between each inner wall of the buffer groove 5 and the excircle of the buffer shaft 4 and the distance between the front end of the buffer shaft 4 and the inner side surface of the buffer groove 5 are equal. The limiting buffer device 3 is positioned in the space center formed by the shock absorbers 11 on the inner table body 1, and the line angle coupling generated in the dynamic work is avoided.
The working process of the invention is as follows:
buffer shaft 4 is embedded in dashpot 5, under dynamic operating condition, the displacement takes place for stage body 1 in shock absorber 11 drives, stage body 1 drives buffer shaft 4 and moves together, buffer shaft 4 moves certain stroke this moment after, silicon rubber cushion collar 6 can take place elastic collision with the inboard of dashpot 5, elastic collision this moment, the stroke of shock absorber 11 has not only been restricted, protection shock absorber rubber position is not torn, the cushioning effect that buffer shaft 4 played simultaneously also makes and is used to the navigation system and reduce an amount of error.

Claims (5)

1. The limit buffer device for inertial navigation is characterized in that two limit buffer devices (3) are arranged and symmetrically distributed on two sides of an inertial navigation system, each limit buffer device (3) comprises a buffer shaft (4) and a buffer groove (5), each buffer shaft (4) comprises an inner platform body mounting shaft (8), a pressing plate (7) and a buffer sleeve (6) sleeved on the inner platform body mounting shaft (8), each buffer sleeve (6) is of a hollow cylindrical structure, a groove for mounting the pressing plate (7) is formed in the center of the upper surface of each buffer sleeve (6), and each pressing plate (7) is fixed with the inner platform body mounting shaft (8) through a screw; the inner table body (1) is connected with the base (2) through a plurality of vibration absorbers, a buffer groove used for containing the buffer shaft (4) is formed in the inner side wall of the base (2), the buffer groove (5) comprises a U-shaped groove (9) and a pressing strip (10), two arms of the U-shaped groove (9) are respectively inserted into two sides of the buffer shaft (4), and the U-shaped groove (9) is connected with the pressing strip (10) which can seal the buffer shaft (4) in a matching mode;
the distances from the inner sides of the two arms of the U-shaped groove (9), the bottom surface of the U-shaped groove (9) and the inner side of the pressing strip (10) to the excircle of the buffer sleeve (6) are equal; the distance between the upper surface of the buffer sleeve (6) and the inner side surface of the buffer groove (5) is equal to the distance between the inner side of the pressing strip (10) and the excircle of the buffer sleeve (6); the limiting buffer device (3) is positioned in the space center of the plurality of shock absorbers (11) between the inner table body (1) and the base (2); the depth of a groove for mounting the pressing plate (7) on the buffer sleeve (6) is greater than the sum of the thickness of a flange plate of the pressing plate (7) and the compression amount generated on the upper surface of the buffer sleeve (6) in the dynamic displacement process; the distance between the mounting surface of the shock absorber (11) on the inner platform body (1) and the outer side surface of the U-shaped groove (9) is larger than the compression amount generated by the upper surface of the buffer sleeve (6) in the dynamic displacement process.
2. The limit buffer device for inertial navigation according to claim 1, wherein the buffer sleeve (6) is made of silicon rubber.
3. The limit buffer device for inertial navigation according to claim 1, wherein the pressure plate (7) is made of titanium alloy material.
4. The limit cushion device for inertial navigation according to claim 1, wherein the bead (10) is made of stainless steel.
5. The limit buffer device for inertial navigation according to claim 1, wherein the U-shaped groove (9) and the base (2) are of an integrated structure.
CN202011324699.9A 2020-11-23 2020-11-23 Limiting and buffering device for inertial navigation Active CN112377568B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202011324699.9A CN112377568B (en) 2020-11-23 2020-11-23 Limiting and buffering device for inertial navigation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202011324699.9A CN112377568B (en) 2020-11-23 2020-11-23 Limiting and buffering device for inertial navigation

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CN112377568A CN112377568A (en) 2021-02-19
CN112377568B true CN112377568B (en) 2022-02-18

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Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITPN20070036U1 (en) * 2007-11-06 2009-05-07 Lightech S R L SMORZA-URTI BUFFER FOR MOTORCYCLES
US8122866B2 (en) * 2008-10-29 2012-02-28 GM Global Technology Operations LLC Acoustic bumpers with engine front cover hidden mounting
CN202326860U (en) * 2011-12-09 2012-07-11 安徽巨一自动化装备有限公司 Anti-collision block for logistics delivery wagon
CN106369092A (en) * 2016-09-27 2017-02-01 中国船舶重工集团公司第七0七研究所 Laser gyroscope inertia set rubber shock absorber dislocation prevention device
CN210068853U (en) * 2019-05-20 2020-02-14 四川航浩科技有限公司 Limiting protection device for limiting dynamic displacement of inertial navigation platform body assembly
CN111692258B (en) * 2020-05-18 2021-12-03 北京智天新航科技有限公司 Shock-resistant rubber shock absorber

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