Magnetic shielding and heat insulation mounting structure for fiber-optic gyroscope

Abstract

The invention discloses a magnetic shielding and heat insulation mounting structure for a fiber-optic gyroscope, which comprises a mounting base body and a magnetic shielding structure connected to the mounting base body, a fiber-optic ring part is arranged in the magnetic shielding structure, and the magnetic shielding structure comprises a magnetic shielding inner ring bin with an inner ring-shaped sealing cavity and a magnetic shielding outer ring bin with an outer ring-shaped sealing cavity; the optical fiber ring component is arranged in the inner annular sealing cavity, the magnetic shielding inner ring bin is located in the outer annular sealing cavity, and a heat insulation layer for connecting and fixing the magnetic shielding inner ring bin and the magnetic shielding outer ring bin is arranged between the magnetic shielding inner ring bin and the magnetic shielding outer ring bin. The fiber-optic gyroscope has the advantages that the magnetic shielding effectiveness and the heat insulation effect are good, and the precision and the operation stability of the fiber-optic gyroscope in a complex electromagnetic environment and a temperature change scene can be improved.

Description

Technical Field

[0001] This invention relates to the field of fiber optic gyroscope technology, and specifically to a magnetic shielding and heat-insulating mounting structure for fiber optic gyroscopes. Background Technology

[0002] As a core component of inertial navigation systems, fiber optic gyroscopes are susceptible to the effects of external electromagnetic interference and temperature fluctuations on their accuracy. Existing fiber optic gyroscopes typically employ a single layer of high-permeability magnetic shielding material, which offers limited shielding effectiveness in strong electromagnetic environments, failing to meet the demands of high-precision navigation. Furthermore, traditional thermal insulation structures often rely on a single material or simple sandwich design, which is insufficient in suppressing temperature gradient changes, leading to measurement errors in the gyroscope's internal optical and circuit components due to temperature drift. Currently, while some double-layer magnetic shielding technologies exist in the market, most are not effectively integrated with thermal insulation design. Furthermore, the magnetic shielding materials used exhibit rapid permeability decay in high-frequency electromagnetic environments, and the thermal resistance coefficient and mechanical compatibility of the insulation layer materials also have room for improvement. In addition, the bottom and side thermal insulation treatments of existing structures are relatively simple, failing to provide comprehensive temperature protection for the core sensitive components of the gyroscope, thus limiting the application expansion of fiber optic gyroscopes in extreme environments. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the shortcomings of the existing technology and provide a magnetic shielding and heat insulation installation structure for fiber optic gyroscopes with good magnetic shielding effectiveness and heat insulation effect, which can improve the accuracy and operational stability of fiber optic gyroscopes in complex electromagnetic environments and temperature change scenarios.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A magnetic shielding and heat insulation mounting structure for a fiber optic gyroscope includes a mounting base and a magnetic shielding structure connected to the mounting base. The magnetic shielding structure contains a fiber optic ring component. The magnetic shielding structure includes an inner magnetic shielding chamber with an inner annular sealed cavity and an outer magnetic shielding chamber with an outer annular sealed cavity. The fiber optic ring component is disposed within the inner annular sealed cavity, and the inner magnetic shielding chamber is located within the outer annular sealed cavity. A heat insulation layer is provided between the inner and outer magnetic shielding chambers to connect and fix them.

[0005] As a further improvement to the above technical solution: The inner and outer magnetic shielding chambers are made of different magnetic shielding materials to form a gradient magnetic shielding system.

[0006] The inner magnetic shielding chamber is a component made of iron-nickel-based soft magnetic alloy material 1J85, and the outer magnetic shielding chamber is a component made of iron-nickel-based soft magnetic alloy material 1J50.

[0007] The wall thickness of the inner magnetic shielding chamber is 0.5mm to 1.5mm, and the wall thickness of the outer magnetic shielding chamber is 1.0mm to 2.0mm.

[0008] The magnetic shielding inner ring chamber includes an inner top cover and an inner shell with an annular groove. The inner top cover and the inner shell are laser-welded together, and the opening end of the annular groove of the inner shell is closed to form the inner annular sealed cavity. The magnetic shielding outer ring chamber includes an outer top cover and an outer shell with an annular groove. The outer top cover and the outer shell are laser-welded together, and the opening end of the annular groove of the outer shell is closed to form the outer annular sealed cavity.

[0009] The heat insulation layer includes an annular heat insulation sheet and a heat insulation adhesive layer. The annular heat insulation sheet is located in the bottom gap between the inner ring chamber and the outer annular sealing cavity of the magnetic shield, and the annular heat insulation sheet 51 is connected and fixed to the inner ring chamber 3 and the outer ring chamber 4 of the magnetic shield. The heat insulation adhesive layer is located in the side gap and top gap between the inner ring chamber and the outer annular sealing cavity of the magnetic shield, and the heat insulation adhesive layer is bonded and fixed to the inner ring chamber and the outer ring chamber of the magnetic shield.

[0010] The annular heat insulation sheet is bonded and fixed to the outer wall of the magnetic shielding inner ring chamber and the inner wall of the outer annular sealing cavity by adhesive bonding; the annular heat insulation sheet is fixed in the outer annular sealing cavity by mechanical pressing.

[0011] The heat insulation adhesive layer is made of heat insulation adhesive with a thermal conductivity of 0.1 to 0.5 W / m·K and elastic cushioning properties.

[0012] The annular heat insulation sheet is a zirconia ceramic sheet with a thickness of 0.5 mm to 2.0 mm. Its surface is treated with micro-nano porous technology to form a porous structure with a pore size of 50 nm to 200 nm and a porosity of 40% to 60%.

[0013] The magnetic shielding outer ring chamber is provided with multiple mounting lugs with connection holes. Each mounting lug is connected and fixed to the mounting base by a connecting screw passing through the connection hole. A heat insulation gasket is provided between the mounting lug and the mounting base, and between the mounting lug and the nut of the connecting screw.

[0014] Compared with the prior art, the advantages of the present invention are as follows: The magnetic shielding and heat insulation mounting structure for fiber optic gyroscopes of this invention adopts a double-layer magnetic shielding structure consisting of an inner magnetic shielding chamber and an outer magnetic shielding chamber, which has excellent magnetic shielding effectiveness. At the same time, a heat insulation layer is set between the inner and outer magnetic shielding chambers for heat insulation, which has good heat insulation effect and can effectively reduce the impact of external electromagnetic interference and temperature fluctuations on the accuracy of fiber optic gyroscopes. The heat insulation layer also connects and fixes the inner and outer magnetic shielding chambers, making the overall structure stable and maintaining stable and reliable magnetic shielding effectiveness and heat insulation performance. This can improve the accuracy and operational stability of fiber optic gyroscopes in complex electromagnetic environments and temperature change scenarios. Attached Figure Description

[0015] Figure 1 This is a top view schematic diagram of the magnetic shielding and heat insulation mounting structure for a fiber optic gyroscope.

[0016] Figure 2 A cross-sectional schematic diagram of the magnetic shielding and heat insulation mounting structure for fiber optic gyroscopes.

[0017] Figure 3 for Figure 2 Enlarged structural diagram at point A in the middle.

[0018] Figure 4 A three-dimensional structural diagram showing the disassembled magnetic shielding and heat insulation mounting structure for fiber optic gyroscopes.

[0019] Legend: 1. Mounting base; 2. Fiber optic ring component; 3. Magnetic shielding inner ring chamber; 301. Inner top cover; 302. Inner shell; 31. Inner annular sealing cavity; 4. Magnetic shielding outer ring chamber; 401. Outer top cover; 402. Outer shell; 41. Outer annular sealing cavity; 42. Mounting lug; 5. Thermal insulation layer; 51. Annular thermal insulation sheet; 52. Thermal insulation adhesive layer; 6. Connecting screws; 7. Thermal insulation gasket. Detailed Implementation

[0020] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] like Figures 1 to 4 As shown, the magnetic shielding and heat insulation mounting structure for the fiber optic gyroscope in this embodiment includes a mounting base 1 and a magnetic shielding structure connected to the mounting base 1. The magnetic shielding structure is provided with a fiber optic ring component 2, which is a ring structure made of optical fiber. The magnetic shielding structure includes an inner magnetic shielding chamber 3 with an inner annular sealing cavity 31 and an outer magnetic shielding chamber 4 with an outer annular sealing cavity 41. The fiber optic ring component 2 is fixedly disposed in the inner annular sealing cavity 31, and the inner magnetic shielding chamber 3 is located in the outer annular sealing cavity 41. A heat insulation layer 5 is provided between the inner magnetic shielding chamber 3 and the outer magnetic shielding chamber 4 to connect and fix the inner magnetic shielding chamber 3 and the outer magnetic shielding chamber 4. The fiber optic gyroscope uses a magnetic shielding and heat insulation mounting structure with a double-layer magnetic shielding structure consisting of an inner magnetic shielding chamber 3 and an outer magnetic shielding chamber 4, which has excellent magnetic shielding effectiveness. At the same time, a heat insulation layer 5 is set between the inner magnetic shielding chamber 3 and the outer magnetic shielding chamber 4 for heat insulation. Its heat insulation effect is good and can effectively reduce the impact of external electromagnetic interference and temperature fluctuations on the accuracy of the fiber optic gyroscope. The heat insulation layer 5 also connects and fixes the inner magnetic shielding chamber 3 and the outer magnetic shielding chamber 4, making the overall structure stable and maintaining stable and reliable magnetic shielding effectiveness and heat insulation performance. This can improve the accuracy and operational stability of the fiber optic gyroscope in complex electromagnetic environments and temperature change scenarios.

[0022] In this embodiment, the magnetic shielding inner ring chamber 3 and the magnetic shielding outer ring chamber 4 are made of different magnetic shielding materials to form a gradient magnetic shielding system, which can achieve overall efficient shielding in complex electromagnetic environments such as wide dynamic range and wide frequency band magnetic fields.

[0023] In this embodiment, the inner magnetic shielding chamber 3 is a component made of iron-nickel-based soft magnetic alloy material 1J85, and the outer magnetic shielding chamber 4 is a component made of iron-nickel-based soft magnetic alloy material 1J50. Iron-nickel-based soft magnetic alloy material 1J85 has high initial permeability, effectively shielding weak low-frequency magnetic fields, while iron-nickel-based soft magnetic alloy material 1J50 has high saturation magnetic induction, capable of withstanding relatively strong external magnetic fields without rapid saturation failure. This combination of iron-nickel-based soft magnetic alloy materials 1J85 and 1J50, based on their magnetic properties, can construct a gradient magnetic shielding system. This allows the outer layer to first respond to and attenuate strong magnetic field components, creating a lower magnetic field strength working environment for the inner layer. This enables the inner layer to more effectively utilize its high initial permeability, ultimately achieving overall efficient shielding against wide dynamic range and wide frequency band magnetic fields. In addition, the inner magnetic shielding chamber 3 and the outer magnetic shielding chamber 4 are made of iron-nickel based soft magnetic alloy material 1J85 and iron-nickel based soft magnetic alloy material 1J50. The materials are easy to obtain, low in cost and easy to control.

[0024] In other embodiments, the gradient magnetic shielding system described above can be configured in reverse according to the specific magnetic field environment. Alternatively, the materials of the inner magnetic shielding chamber 3 and the outer magnetic shielding chamber 4 can be adjusted according to cost and specific shielding requirements. For example, both the inner magnetic shielding chamber 3 and the outer magnetic shielding chamber 4 can be made of iron-nickel-based soft magnetic alloy material 1J85 or both can be made of iron-nickel-based soft magnetic alloy material 1J50. The inner magnetic shielding chamber 3 and the outer magnetic shielding chamber 4 can also be configured in other gradient magnetic property combinations, such as using a permalloy combination.

[0025] In this embodiment, the wall thickness of the inner magnetic shielding chamber 3 is 0.5mm to 1.5mm, and the wall thickness of the outer magnetic shielding chamber 4 is 1.0mm to 2.0mm. While ensuring good magnetic shielding effect, materials and costs are saved and the structural compactness is improved.

[0026] In this embodiment, the magnetic shielding inner ring chamber 3 includes an inner top cover 301 and an inner shell 302 with an annular groove. The inner top cover 301 and the inner shell 302 are laser-welded together, and the opening end of the annular groove of the inner shell 302 is closed to form an inner annular sealed cavity 31. The magnetic shielding outer ring chamber 4 includes an outer top cover 401 and an outer shell 402 with an annular groove. The outer top cover 401 and the outer shell 402 are laser-welded together, and the opening end of the annular groove of the outer shell 402 is closed to form an outer annular sealed cavity 41. This facilitates installation and assembly and provides a good sealing effect. Preferably, the bottom surface of the fiber optic ring component 2, which is wound into a ring structure, is bonded and fixed to the bottom surface of the annular groove of the inner shell 302 with epoxy AB adhesive, so that the fiber optic ring component 2 is firmly installed and operates stably and reliably.

[0027] Preferably, the top openings of the inner housing 302 and the outer housing 402 are designed with inward or outward folded edges or flanges, which facilitates reliable connection with other components of the fiber optic gyroscope (such as Y-waveguides, gyroscope platforms or bases, etc.) and also helps to reduce end magnetic leakage caused by discontinuities in the shielding structure.

[0028] In this embodiment, the heat insulation layer 5 includes an annular heat insulation sheet 51 and a heat insulation adhesive layer 52. The annular heat insulation sheet 51 is fixed in the bottom gap between the inner magnetic shielding chamber 3 and the outer annular sealing cavity 41, and is connected and fixed to the inner magnetic shielding chamber 3 and the outer magnetic shielding chamber 4. The heat insulation adhesive layer 52 is located in the side gap and top gap between the inner magnetic shielding chamber 3 and the outer annular sealing cavity 41, and is bonded and fixed to the inner magnetic shielding chamber 3 and the outer magnetic shielding chamber 4. The annular heat insulation sheet 51 can block or significantly reduce heat conduction from the installation interface of the optical fiber ring component 2 or its lower heat source. The heat insulation adhesive layer 52 can effectively prevent heat transfer between the inner magnetic shielding chamber 3 and the outer magnetic shielding chamber 4. At the same time, the heat insulation adhesive layer 52 also plays a role in structural bonding and fixing, firmly combining the inner magnetic shielding chamber 3 and the outer magnetic shielding chamber 4 into a whole. In addition to its excellent heat insulation effect, the annular heat insulation sheet 51 also provides mechanical support and positioning, enabling the inner magnetic shielding chamber 3 to be more accurately and stably fixed in the outer magnetic shielding chamber 4. This ensures the accurate and stable installation position and orientation of the fiber optic ring component 2 installed within the inner magnetic shielding chamber 3, preventing disruption of the thermal and mechanical symmetry established during the winding of the fiber optic ring component 2. Simultaneously, it maintains the relative position of the inner and outer magnetic shielding chambers 3 and 4, ensuring the stability of the magnetic shielding effect.

[0029] In this embodiment, the annular heat insulation sheet 51 is bonded and fixed to the outer wall of the magnetic shielding inner ring chamber 3 and the inner wall of the outer annular sealing cavity 41 by adhesive bonding, which is simple to assemble and low in cost. The adhesive used for bonding is one of two-component epoxy AB adhesive, precision structural epoxy adhesive, and cyanoacrylate adhesive. Precision structural epoxy adhesive and cyanoacrylate adhesive have high temperature resistance and low gas release. Preferably, the annular heat insulation sheet 51 is fixed in the outer annular sealing cavity 41 by mechanical compression, for example, by expanding and fixing the annular heat insulation sheet 51 in the outer annular sealing cavity 41, which can further improve the installation stability of the annular heat insulation sheet 51 and make the magnetic shielding inner ring chamber 3 more accurately and stably fixed in the magnetic shielding outer ring chamber 4.

[0030] In this embodiment, the thermal insulation layer 52 is selected from thermal insulation adhesives with a thermal conductivity of 0.1–0.5 W / m·K and elastic buffering properties, such as silicone-based solid thermal insulation adhesives. It can effectively insulate heat and absorb and buffer some mechanical vibration and impact energy, avoiding impact on the working performance of the fiber optic gyroscope.

[0031] In this embodiment, the annular heat insulation sheet 51 is a zirconia ceramic sheet with a thickness of 0.5 mm to 2.0 mm. Its surface is treated with micro-nano porous technology to form a porous structure with a pore size of 50 nm to 200 nm and a porosity of 40% to 60%. It has low thermal conductivity, high dielectric strength, excellent mechanical properties, and good high-temperature stability.

[0032] In this embodiment, the magnetic shielding outer ring chamber 4 is provided with multiple mounting lugs 42 with connection holes. Each mounting lug 42 is connected and fixed to the mounting base 1 by a connecting screw 6 passing through the connection hole. A heat insulation gasket 7 is provided between the mounting lug 42 and the mounting base 1, and between the mounting lug 42 and the nut of the connecting screw 6. This can block or significantly reduce the heat conduction from the mounting base 1 to the fiber optic ring component 2 along the connecting screw 6.

[0033] The method for preparing the magnetic shielding and heat-insulating mounting structure for the fiber optic gyroscope in this embodiment includes the following steps: 1. Fabrication of magnetic shielding components: Based on the size and shape of the fiber optic gyroscope, the inner magnetic shielding chamber 3 and the outer magnetic shielding chamber 4 are designed and manufactured. The manufactured magnetic shielding parts are subjected to high-temperature annealing treatment at a temperature of 1050℃~1150℃ for 2~4 hours, followed by furnace cooling to room temperature. During the heat treatment process, the iron-nickel-based soft magnetic alloy material 1J85 is annealed using hydrogen annealing, and the iron-nickel-based soft magnetic alloy material 1J50 is annealed using vacuum annealing. The bottom surface of the annular groove of the inner shell 302 and the bottom surface of the annular groove of the outer shell 402 (i.e., the bonding surface) are sandblasted, and the surface roughness is generally greater than Ra3.2. Zirconia ceramic sheets are processed into annular heat insulation sheets 51 of the required shape and size. The surface of the annular heat insulation sheets 51 is treated with micro-nano-level porous structure to form a porous structure with a pore size of 50~200nm and a porosity of 40%-60%.

[0034] 2. Assembly of the magnetically shielded inner ring compartment 3: The wound fiber optic ring component 2 is bonded to the bottom surface of the annular groove of the inner housing 302 using a two-component epoxy resin adhesive; the inner housing 302 and the inner top cover 301 are welded and sealed using laser welding.

[0035] 3. Assembly of the bottom insulation layer: The bottom of the annular heat insulation sheet 51 is bonded to the bottom surface of the annular groove of the outer shell 402 using a two-component epoxy resin adhesive; the assembled magnetic shielding inner ring chamber 3 is bonded to the top bonding surface of the annular heat insulation sheet 51 using a two-component epoxy resin adhesive.

[0036] 4. Preparation of the side insulation interlayer: The silicone-based solid heat insulation material is filled into the four-dimensional gap between the inner magnetic shielding chamber 3 and the outer magnetic shielding chamber 4, as well as the top of the inner magnetic shielding chamber 3.

[0037] 5. Assembly: Laser welding is used to weld and encapsulate the outer shell 402 and the outer top cover 401; the Y waveguide and fiber optic ring component 2 are fixed in the designed position; the mounting lugs 42 of the magnetic shielding outer ring chamber 4 are installed and fixed to the mounting base 1 (usually the fiber optic gyroscope platform) using connecting screws 6; heat insulation pads 7 are placed between the mounting lugs 42 and the mounting base 1, and between the mounting lugs 42 and the nuts of the connecting screws 6 for heat insulation, thus forming a complete magnetic shielding and heat insulation mounting structure for fiber optic gyroscopes.

[0038] After the magnetic shielding and heat insulation mounting structure for the fiber optic gyroscope is prepared, the following performance tests can be performed: 1. Magnetic shielding effectiveness test: The magnetic shielding effectiveness of the magnetic shielding and heat insulation installation structure for fiber optic gyroscopes is tested under magnetic field environments of different frequencies and intensities. 2. Thermal insulation performance test: The thermal insulation performance of the magnetic shielding and thermal insulation installation structure for fiber optic gyroscopes is tested under different temperature environments; 3. Fiber Optic Gyroscope Performance Test: Test the accuracy and stability of the fiber optic gyroscope's angular velocity measurement.

[0039] The above description is merely a preferred embodiment of the present invention, and the scope of protection of the present invention is not limited to the above embodiments. For those skilled in the art, improvements and modifications obtained without departing from the inventive concept should also be considered within the scope of protection of the present invention.

Claims

1. A magnetic shielding and heat insulation mounting structure for a fiber optic gyroscope, comprising a mounting base (1) and a magnetic shielding structure connected to the mounting base (1), wherein the magnetic shielding structure contains a fiber optic ring component (2), characterized in that: The magnetic shielding structure includes an inner magnetic shielding chamber (3) with an inner annular sealing cavity (31) and an outer magnetic shielding chamber (4) with an outer annular sealing cavity (41). The fiber optic ring component (2) is located in the inner annular sealing cavity (31), and the inner magnetic shielding chamber (3) is located in the outer annular sealing cavity (41). A heat insulation layer (5) is provided between the inner magnetic shielding chamber (3) and the outer magnetic shielding chamber (4) to connect and fix the inner magnetic shielding chamber (3) and the outer magnetic shielding chamber (4).

2. The magnetic shielding and heat insulation mounting structure for fiber optic gyroscopes according to claim 1, characterized in that: The magnetic shielding inner ring chamber (3) and the magnetic shielding outer ring chamber (4) are made of different magnetic shielding materials to form a gradient magnetic shielding system.

3. The magnetic shielding and heat insulation mounting structure for fiber optic gyroscopes according to claim 2, characterized in that: The inner magnetic shielding chamber (3) is a component made of iron-nickel-based soft magnetic alloy material 1J85, and the outer magnetic shielding chamber (4) is a component made of iron-nickel-based soft magnetic alloy material 1J50.

4. The magnetic shielding and heat insulation mounting structure for fiber optic gyroscopes according to claim 3, characterized in that: The wall thickness of the inner magnetic shielding chamber (3) is 0.5mm~1.5mm, and the wall thickness of the outer magnetic shielding chamber (4) is 1.0mm~2.0mm.

5. The magnetic shielding and heat insulation mounting structure for fiber optic gyroscopes according to claim 1, characterized in that: The magnetic shielding inner ring chamber (3) includes an inner top cover (301) and an inner shell (302) with an annular groove. The inner top cover (301) and the inner shell (302) are laser welded together, and the opening end of the annular groove of the inner shell (302) is closed to form the inner annular sealed cavity (31). The magnetic shielding outer ring chamber (4) includes an outer top cover (401) and an outer shell (402) with an annular groove. The outer top cover (401) and the outer shell (402) are laser welded together, and the opening end of the annular groove of the outer shell (402) is closed to form the outer annular sealed cavity (41).

6. The magnetic shielding and heat insulation mounting structure for fiber optic gyroscopes according to claim 1, characterized in that: The heat insulation layer (5) includes an annular heat insulation sheet (51) and a heat insulation adhesive layer (52). The annular heat insulation sheet (51) is located in the bottom gap between the inner ring chamber (3) and the outer annular sealing cavity (41) of the magnetic shielding, and the annular heat insulation sheet (51) is connected and fixed to the inner ring chamber (3) and the outer ring chamber (4) of the magnetic shielding. The heat insulation adhesive layer (52) is located in the side gap and top gap between the inner ring chamber (3) and the outer annular sealing cavity (41) of the magnetic shielding, and the heat insulation adhesive layer (52) is bonded and fixed to the inner ring chamber (3) and the outer ring chamber (4) of the magnetic shielding.

7. The magnetic shielding and heat insulation mounting structure for fiber optic gyroscopes according to claim 6, characterized in that: The annular heat insulation sheet (51) is bonded and fixed to the outer wall of the magnetic shielding inner ring chamber (3) and the inner wall of the outer annular sealing cavity (41) by adhesive bonding; the annular heat insulation sheet (51) is fixed in the outer annular sealing cavity (41) by mechanical pressing.

8. The magnetic shielding and heat insulation mounting structure for fiber optic gyroscopes according to claim 6, characterized in that: The heat insulation adhesive layer (52) is selected from heat insulation adhesives with a thermal conductivity of 0.1~0.5W / m·K and elastic buffering properties.

9. The magnetic shielding and heat-insulating mounting structure for fiber optic gyroscopes according to claim 6, characterized in that: The annular heat insulation sheet (51) is a zirconia ceramic sheet with a thickness of 0.5 mm to 2.0 mm. Its surface is treated with micro-nano porous treatment to form a porous structure with a pore size of 50 nm to 200 nm and a porosity of 40% to 60%.

10. The magnetic shielding and heat insulation mounting structure for fiber optic gyroscopes according to claim 1, characterized in that: The magnetic shielding outer ring chamber (4) is provided with multiple mounting lugs (42) with connection holes. Each mounting lug (42) is connected and fixed to the mounting base (1) by a connecting screw (6) passing through the connection hole. A heat insulation gasket (7) is provided between the mounting lug (42) and the mounting base (1) and between the mounting lug (42) and the nut of the connecting screw (6).

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