A micro inertial group built-in vibration reduction structure

Abstract

The present disclosure relates to a built-in vibration reduction structure of a miniature inertial group, including: a circuit bracket with a sensitive element, a vibration absorber, a mounting base and a center of mass balance device, wherein the vibration absorber is composed of a limit screw, a vibration damping pad I and a vibration damping pad II, the circuit bracket with the sensitive element is only in contact with the vibration damping pad I, the mounting base is in contact with the vibration damping pad I and the vibration damping pad II, and is not in direct contact with the circuit bracket with the sensitive element; the vibration absorber is evenly placed in an equilateral triangle or quadrilateral. The advantages of the present invention are: simple structure, not only greatly improving the measurement accuracy and greatly reducing the volume, but also greatly enhancing the ability to resist impact and vibration, which can meet the application requirements of harsh mechanical environments. It has the advantages of small size, light weight, low cost, high reliability, resistance to high impact vibration, strong environmental adaptability, and good application prospects and military significance in the field of precision weapon guidance and control.

Description

Technical Field

[0001] The invention relates to a micro inertial group built-in vibration reduction structure. Background Art

[0002] With the development of micro-missiles such as guided grenades, the micro-inertial group, as an important component of the missile, determines the guidance performance of the missile with its measurement performance, restricts the size of the missile with its structural size, and affects the reliability of the missile with its stability. Therefore, the micro-inertial group must also keep up with the development of missiles. To solve the problems that restrict the development of micro-inertial groups, we must first solve the problems of their structural size and ability to withstand mechanical environments.

[0003] The micro-inertial group composed of micro-mechanical gyroscopes, micro-mechanical accelerometers, etc. is relatively sensitive to shock vibration, especially large-scale shock, which has a great impact on the stable output of the micro-mechanical gyroscope. Since the micro-inertial group requires a small size, it is extremely difficult to reduce the vibration of the micro-inertial group. At present, the domestic micro-inertial groups that can maintain stable output in shocks of more than 2000g are either large in size, unable to maintain stable output or directly damaged. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a micro inertial group built-in vibration reduction structure, which effectively reduces the installation space of the inertial group and greatly improves the measurement reliability.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: a micro inertial group built-in vibration reduction structure, characterized in that it includes: a circuit bracket with a sensitive element, a vibration absorber, a mounting base and a center of mass balancing device, wherein:

[0006] The vibration damper is composed of a limit screw, a vibration damping pad I and a vibration damping pad II. The circuit bracket with the sensitive element is only in contact with the vibration damping pad I, and the mounting base is in contact with the vibration damping pad I and the vibration damping pad II, but not in direct contact with the circuit bracket with the sensitive element.

[0007] The center of mass balancing device is installed at one end of the limit screw and is used to adjust the axial center of mass so that the center of mass is between the vibration damping pad I and the vibration damping pad II;

[0008] The shock absorber is placed in an equilateral triangle, and the center of mass of the circuit bracket for installing the sensitive element and the balance block is at the center of the triangle;

[0009] The mounting base extends to the middle position of the circuit bracket with the sensitive element and is located between the vibration-damping pad I and the vibration-damping pad II.

[0010] Another object of the present invention is to provide a micro inertial group built-in vibration reduction structure, characterized in that it includes: a circuit bracket with a sensitive element, a vibration absorber, a mounting base and a center of mass balancing device, wherein:

[0011] The vibration damper is composed of a limit screw, a vibration damping pad I and a vibration damping pad II. The circuit bracket with the sensitive element is only in contact with the vibration damping pad I, and the mounting base is in contact with the vibration damping pad I and the vibration damping pad II, but not in direct contact with the circuit bracket with the sensitive element.

[0012] The center of mass balancing device is installed at one end of the limit screw and is used to adjust the axial center of mass so that the center of mass is between the vibration damping pad I and the vibration damping pad II;

[0013] The shock absorbers are evenly placed in a quadrilateral, and the center of mass of the circuit bracket for installing the sensitive element and the balance block is at the center of the quadrilateral;

[0014] The mounting base extends to the middle position of the circuit bracket with the sensitive element and is located between the vibration-damping pad I and the vibration-damping pad II.

[0015] Compared with the prior art, the present invention has the following beneficial technical effects:

[0016] The structure is simple, including: a circuit bracket with a sensitive element, a shock absorber, a mounting base and a center of mass balance device. The three-point or four-point evenly distributed built-in micro-vibration reduction technology is used to realize the vibration reduction design of the entire sensitive unit. Not only the measurement accuracy is greatly improved, the volume is greatly reduced, but also the ability to resist impact and vibration is greatly enhanced, which can meet the application requirements of harsh mechanical environments. It has the advantages of small size, light weight, low cost, high reliability, resistance to high impact and vibration, strong environmental adaptability, and good application prospects and military significance in the field of precision weapon guidance and control. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Schematic diagram of a three-support point embodiment of a micro-inertial group built-in vibration reduction structure of the present invention;

[0018] Figure 2 for Figure 1 a side view of the illustrated embodiment;

[0019] Figure 3 Schematic diagram of a four-support point embodiment of a micro-inertial group built-in vibration reduction structure of the present invention.

[0020] Reference numerals

[0021] 11-mounting base, 12-circuit bracket with sensitive element, 13-center of mass balancing device,

[0022] 14-limit screw, 15-vibration damping pad Ⅰ, 16-vibration damping pad Ⅱ DETAILED DESCRIPTION

[0023] The present invention is further described in detail below through specific implementation examples, but these implementation examples are only for illustration and do not limit the scope of the present invention.

[0024] Please refer to Figure 1 to Figure 2 The micro inertial group built-in vibration reduction structure of the present invention comprises: a circuit bracket 12 with a sensitive element, a vibration absorber, a mounting base 11 and a center of mass balancing device 13, wherein:

[0025] The vibration damper is composed of a limit screw 14, a vibration damping pad I 15, and a vibration damping pad II 16. The circuit bracket with a sensitive element 12 is only in contact with the vibration damping pad I 15, and the mounting base 11 is in contact with the vibration damping pad I 15 and the vibration damping pad II 16, but not in direct contact with the circuit bracket with a sensitive element 12.

[0026] The center of mass balancing device 13 is installed at one end of the limit screw 14, and is used to adjust the axial center of mass so that the center of mass is between the vibration damping pad I 15 and the vibration damping pad II 16;

[0027] The shock absorber is placed in an equilateral triangle, and the center of mass of the circuit bracket for installing the sensitive element and the balance block is at the center of the triangle;

[0028] The mounting base extends to the middle position of the circuit bracket with the sensitive element and is located between the vibration-damping pad I 15 and the vibration-damping pad II 16 .

[0029] In one embodiment, the circuit bracket with sensitive elements is composed of a bracket, an X-axis gyroscope and accelerometer board, a Y-axis gyroscope and accelerometer board, a Z-axis gyroscope and accelerometer board, an FPG board, and an interface board. The five circuit boards are electrically connected through flexible connections and are bonded to the bracket.

[0030] In one embodiment, the size of the micro-inertial unit is Φ40 mm×23 mm.

[0031] In one embodiment, the limiting screw is connected to the circuit bracket with the sensitive element through threads and has a limiting boss.

[0032] In one embodiment, the bottom surface of the bracket has three threaded holes arranged in a regular triangle for connecting the shock absorber.

[0033] Please refer to Figure 3 Another object of the present invention is to provide a micro inertial group built-in vibration reduction structure, including: a circuit bracket with a sensitive element, a vibration absorber, a mounting base and a center of mass balancing device, wherein:

[0034] The vibration damper is composed of a limit screw, a vibration damping pad I and a vibration damping pad II. The circuit bracket with the sensitive element is only in contact with the vibration damping pad I, and the mounting base is in contact with the vibration damping pad I and the vibration damping pad II, but not in direct contact with the circuit bracket with the sensitive element.

[0035] The center of mass balancing device is installed at one end of the limit screw and is used to adjust the axial center of mass so that the center of mass is between the vibration damping pad I and the vibration damping pad II;

[0036] The shock absorbers are evenly placed in a quadrilateral, and the center of mass of the circuit bracket for installing the sensitive element and the balance block is at the center of the quadrilateral;

[0037] The mounting base extends to the middle position of the circuit bracket with the sensitive element and is located between the vibration-damping pad I and the vibration-damping pad II.

[0038] In one embodiment, the circuit bracket with sensitive elements is composed of a bracket, an X-axis gyroscope and accelerometer board, a Y-axis gyroscope and accelerometer board, a Z-axis gyroscope and accelerometer board, an FPG board, and an interface board. The five circuit boards are electrically connected through flexible connections and are bonded to the bracket.

[0039] In one embodiment, the size of the micro-inertial unit is Φ40 mm×23 mm.

[0040] In one embodiment, the limiting screw is connected to the circuit bracket with the sensitive element through threads and has a limiting boss.

[0041] In one embodiment, the bottom surface of the bracket has four threaded holes arranged in a quadrilateral for connecting the shock absorber.

[0042] As a specific embodiment, in the vibration reduction installation method, vibration reduction pad I and vibration reduction pad II are installed on the limit screw; the limit screw is connected to the circuit bracket with sensitive elements through threads and has a limit boss; the mounting base extends to the middle position of the circuit bracket with sensitive elements and is between vibration reduction pad I and vibration reduction pad II, so that the mounting base and the circuit bracket with sensitive elements are isolated by the vibration absorber; the center of mass balancing device is installed at one end of the limit screw to adjust the axial center of mass so that the center of mass is between the vibration reduction pad I and the vibration reduction pad II.

[0043] As a specific embodiment, the micro inertial group is composed of a circuit bracket with a sensitive element, a mounting base, a vibration damper, and a mass center balancing device. The circuit bracket with a sensitive element and the mounting base are internally connected through the vibration damper, and the outer end of the limit screw of the vibration damper is the mass center balancing device.

[0044] As a specific embodiment, the vibration absorber is composed of a vibration-absorbing pad I, a vibration-absorbing pad II and a limiting screw, and a small circle between the vibration-absorbing pad I and the vibration-absorbing pad II is embedded in the mounting hole of the mounting base.

[0045] As a specific embodiment, the circuit bracket with sensitive elements is composed of a bracket, an X-axis gyro and accelerometer board, a Y-axis gyro and accelerometer board, a Z-axis gyro and accelerometer board, an FPG board, and an interface board. The five circuit boards are electrically connected through flexible connections and bonded to the bracket. The bottom surface of the bracket has three threaded holes arranged in an equilateral triangle for connecting the shock absorber.

[0046] Figure 3 It is a four-support-point micro-inertial group vibration reduction structure. Figure 3 Except for the shock absorber being installed at 4 support points, the other structural methods are the same as those at 3 support points.

[0047] As can be seen from the above figure, when the guided grenade has impact energy, the mounting base and the bracket with the sensitive element circuit are separated by a vibration damper, and the energy transmitted to the sensitive element will be attenuated, achieving the purpose of vibration reduction and shock isolation. The center of mass balance device adjusts the center of mass of the bracket with the sensitive element circuit so that its center of mass is between the vibration damping pad I and the vibration damping pad II; the vibration damper is placed in an equilateral triangle or quadrilateral, and the center of mass of the bracket for installing the sensitive element circuit and the center of mass balance device is at the center of the triangle or quadrilateral.

[0048] The present invention adopts three-point or four-point uniformly distributed built-in micro shock absorbers to reduce the volume of the product and improve the ability to resist impact and vibration, so that the volume of the micro inertial group meets the system requirements, and the impact resistance is as high as 3000g, which fully meets the conditions for primer ejection. The micro inertial group consists of a bracket with a sensitive element circuit, a shock absorber, a mounting base and a center of mass balance device. The bracket with a sensitive element circuit consists of a MEMS gyroscope, a MEMS accelerometer and its processing circuit and a bracket; the mounting base is the installation and fixation of the product and the external mechanical interface; the center of mass balance device is used to adjust the center of mass of the bracket with a sensitive element circuit to the geometric center of the shock absorber; the shock absorber consists of a limit screw, a shock absorber pad I, and a shock absorber pad II. The shock absorber pad II is first assembled on the limit screw, and then installed on the mounting base together, and then the shock absorber pad I is assembled, so that the bracket with the sensitive element circuit only contacts with the shock absorber pad I, and the mounting seat contacts with the shock absorber pad I and the shock absorber pad II, and does not directly contact the bracket with the sensitive element circuit. When the impact energy of the guided grenade is transmitted from the projectile body to the micro-inertial group mounting base, the mounting base and the bracket with the sensitive element circuit are separated by vibration-damping material, and the energy transmitted to the sensitive element will be attenuated, thereby achieving the purpose of vibration reduction.

[0049] Based on the combination of micro-mechanical gyroscope, micro-mechanical accelerometer and its processing circuit, the present invention proposes a built-in vibration reduction structure for a micro-inertial group for guided rifle grenades, which reduces the volume of the whole machine, innovatively uses the built-in three-point or four-point uniformly distributed micro-vibration reduction technology to improve the impact resistance, and successfully develops a micro-inertial group, an important component of the guided grenade. By adopting this micro-integration technology, the function of missile attitude measurement can be realized with the smallest hardware scale, and the influence of high impact energy on sensitive components during launch can be adapted. The micro-inertial group consists of a circuit bracket with sensitive components, a vibration damper, a mounting base and a center of mass balance device.

[0050] test

[0051] The present invention has the advantages of small size, light weight, low cost, high reliability, resistance to high impact vibration, etc., strong environmental adaptability, and good application prospects and military significance in the field of precision weapon guidance and control. The energized state successfully passed the 3000g large-scale impact test, and was verified for application on multiple micro-missiles, and participated in multiple flight tests, with excellent performance during the test. The micro-inertial group involved in the present invention requires the upper system to be structurally arranged within the range of Φ40mm×23mm, and the energized state can maintain normal output during and after an impact of the magnitude of 2000g, which is in the leading position in China.

[0052] The present invention has the following beneficial technical effects:

[0053] The structure is simple, including: a circuit bracket with a sensitive element, a shock absorber, a mounting base and a center of mass balance device. The three-point or four-point uniformly distributed built-in micro-vibration reduction technology is used to realize the vibration reduction design of the entire sensitive unit. Not only the measurement accuracy is greatly improved, the volume is greatly reduced, but also the ability to resist impact vibration is greatly enhanced, which can meet the application requirements of harsh mechanical environments. It has the advantages of small size, light weight, low cost, high reliability, resistance to high impact vibration, strong environmental adaptability, and good application prospects and military significance in the field of precision weapon guidance and control. Although the present invention has selected a better embodiment to be disclosed as above, it is not used to limit the present invention. Obviously, it is not necessary and impossible to list all implementation methods here. Any researcher in this field can use the design method and content in the above-mentioned disclosed embodiment to change and modify the research scheme of the present invention without departing from the spirit and scope of the present invention. Therefore, any simple modification, parameter change and modification made to the above-mentioned embodiment according to the research essence of the present invention without departing from the content of the present invention scheme belongs to the protection scope of the present invention scheme.

Claims

1. A micro inertial group built-in vibration reduction structure, characterized in that: include: With sensitive element circuit bracket, vibration damper, mounting base and center of mass balancing device, among which, The vibration damper is composed of a limit screw, a vibration damping pad I and a vibration damping pad II. The circuit bracket with the sensitive element is only in contact with the vibration damping pad I, and the mounting base is in contact with the vibration damping pad I and the vibration damping pad II, but not in direct contact with the circuit bracket with the sensitive element. The center of mass balancing device is installed at one end of the limit screw and is used to adjust the axial center of mass so that the center of mass is between the vibration damping pad I and the vibration damping pad II; The shock absorber is placed in an equilateral triangle, and the center of mass of the circuit bracket for installing the sensitive element and the balance block is at the center of the triangle; The mounting base extends to the middle position of the circuit bracket with the sensitive element and is located between the vibration-damping pad I and the vibration-damping pad II.

2. The micro inertial group built-in vibration reduction structure according to claim 1, characterized in that: The circuit bracket with sensitive elements consists of a bracket, an X-axis gyro and accelerometer board, a Y-axis gyro and accelerometer board, a Z-axis gyro and accelerometer board, an FPG board, and an interface board. The five circuit boards are electrically connected through flexible connections and are bonded to the bracket.

3. The micro-inertial group built-in vibration reduction structure according to claim 2 is characterized in that: The size of the micro inertial group is Φ40mm×23mm.

4. The micro inertial group built-in vibration reduction structure according to claim 3 is characterized in that: The limiting screw is connected to the circuit bracket with the sensitive element through threads and is provided with a limiting boss.

5. The micro-inertial group built-in vibration reduction structure according to claim 2, characterized in that: The bottom surface of the bracket is provided with three threaded holes arranged in a regular triangle for connecting the shock absorber.

6. A micro inertial group built-in vibration reduction structure, characterized in that: include: With sensitive element circuit bracket, vibration damper, mounting base and center of mass balancing device, among which, The vibration damper is composed of a limit screw, a vibration damping pad I and a vibration damping pad II. The circuit bracket with the sensitive element is only in contact with the vibration damping pad I, and the mounting base is in contact with the vibration damping pad I and the vibration damping pad II, but not in direct contact with the circuit bracket with the sensitive element. The center of mass balancing device is installed at one end of the limit screw and is used to adjust the axial center of mass so that the center of mass is between the vibration damping pad I and the vibration damping pad II; The shock absorbers are evenly placed in a quadrilateral, and the center of mass of the circuit bracket for installing the sensitive element and the balance block is at the center of the quadrilateral; The mounting base extends to the middle position of the circuit bracket with the sensitive element and is located between the vibration-damping pad I and the vibration-damping pad II.

7. The micro-inertial group internal vibration reduction structure according to claim 6, characterized in that: The circuit bracket with sensitive elements consists of a bracket, an X-axis gyro and accelerometer board, a Y-axis gyro and accelerometer board, a Z-axis gyro and accelerometer board, an FPG board, and an interface board. The five circuit boards are electrically connected through flexible connections and are bonded to the bracket.

8. The micro-inertial group internal vibration reduction structure according to claim 6, characterized in that: The size of the micro inertial group is Φ40mm×23mm.

9. The micro-inertial group internal vibration reduction structure according to claim 6, characterized in that: The limiting screw is connected to the circuit bracket with the sensitive element through threads and is provided with a limiting boss.

10. The micro-inertial group internal vibration reduction structure according to claim 7, characterized in that: The bottom surface of the bracket is provided with four threaded holes arranged in a quadrilateral for connecting the shock absorber.

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