Double-deck labyrinth electromagnetic protection slewing shaft system for stabilizing platform

Abstract

The application relates to a double-layer labyrinth electromagnetic protection slewing shaft system for a stable platform, according to the structural characteristics of the slewing shaft system of the stable platform, a double-layer labyrinth structure is designed, the labyrinth teeth of the first-layer labyrinth structure and the second-layer labyrinth structure are arranged in perpendicular directions, the mutual perpendicular labyrinth paths greatly increase the difficulty of electromagnetic wave propagation, form a more complex propagation path with greater loss, and thus the effect of far exceeding the single-layer labyrinth protection is realized; the double-layer labyrinth structure does not increase the rotating resistance of the slewing shaft system, can realize the high-efficiency electromagnetic protection effect, and can greatly improve the working stability and reliability of the stable platform.

Description

Technical Field

[0001] This invention relates to the field of electromagnetic protection technology for optoelectronic equipment, and specifically to a double-layer labyrinth electromagnetic protection rotary shaft system for stabilizing platforms. Background Technology

[0002] A stabilization platform is an inertial stabilization device that uses a frame structure as its carrier, senses attitude deviations through gyroscopes, and drives torque motors to perform corrections. It is widely used in missile guidance, airborne remote sensing, and spacecraft navigation. A typical stabilization platform structure consists of a frame system, gyroscopes and accelerometers as core sensing components, and servo control loops. The frame structure needs to achieve three-degree-of-freedom motion isolation through mechanical axes, generally including an azimuth frame, an azimuth axis, a pitch frame, and a pitch axis. The azimuth frame is connected to the azimuth axis and rotates with it. Inside the azimuth frame, a pitch frame is located via the pitch axis. For a three-axis stabilization platform, a roll axis and a roll frame are further located within the pitch frame, and the roll frame houses the camera and other carriers.

[0003] To ensure the motion characteristics of the stabilizing platform, there are gaps between the structures of the rotary shaft system. These gaps are the channels through which electromagnetic waves can intrude. Electromagnetic waves intruding into the interior can affect the working stability and reliability of the stabilizing platform. Currently, there are no effective electromagnetic protection measures in terms of structure. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the purpose of this invention is to provide a double-layer labyrinth electromagnetic protection rotary shaft system for stabilizing platforms. The double-layer labyrinth structure significantly attenuates electromagnetic waves, thereby improving the anti-electromagnetic interference capability of the stabilizing platform.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A double-layer labyrinth electromagnetic protection rotary shaft system for stabilizing a platform is disclosed. The rotary shaft system includes a motor base and a motor assembly. The motor assembly is mounted on the motor base and includes a torque motor and a motor connecting shaft. A fork-shaped component is fixedly connected below the motor connecting shaft. The motor base has an internal cavity structure with built-in optoelectronic devices for the stabilizing platform. The motor connecting shaft has an inverted "T" shaped structure. A first gap exists between the upper end face of the horizontal portion of the motor connecting shaft and the lower end face of the motor base. A first layer of labyrinth structure is provided at this first gap. The first layer of labyrinth structure uses vertically interlocking grates. A second gap exists between the lower end face of the motor base and the upper end face of the fork-shaped component. The lower edge of the motor base is adjacent to the upper edge of the fork-shaped component. A second layer of labyrinth structure is provided outside both of them. The second layer of labyrinth structure uses horizontally interlocking grates.

[0006] Furthermore, the lower end face of the motor base and the upper end face of the horizontal part of the motor connecting shaft are respectively provided with vertical comb-like structures, which interlock to form the first layer of labyrinth structure.

[0007] Furthermore, the engagement length of the vertical sieve-like structure is not greater than the first gap, and the gap between each tooth of the vertical sieve is 0.75mm.

[0008] Furthermore, the second-layer maze structure includes an inner maze ring and an outer maze ring. The inner maze ring is fixed to the lower edge of the motor base, and the outer maze ring is fixed to the upper edge of the fork-shaped component. The inner and outer maze rings are respectively horizontally toothed structures, and they interlock to form the second-layer maze structure.

[0009] Furthermore, the gap between the horizontal grates is 0.75 mm, and the bite length is 30 mm.

[0010] Furthermore, the inner ring of the maze is a circular structure, which is fixed to the outside of the lower edge of the motor base.

[0011] Furthermore, the outer ring of the maze is composed of two semi-circular toothed rings, which are connected by screws to form a ring and fixed to the outer edge of the fork-shaped piece.

[0012] Furthermore, both the first and second layer maze structures are made of aluminum alloy.

[0013] Furthermore, the motor base includes an inner wall, an outer wall, a lower end face, and a top cover. The inner wall and the outer wall are connected at the bottom through the lower end face, and there is a cavity structure between the inner wall and the outer wall. The top cover is detachably installed on top of the outer wall.

[0014] Furthermore, the inner wall of the motor mount is designed with a stepped hole structure that adapts to the external structure of the motor assembly, and a bearing is provided between the motor mount and the motor connecting shaft.

[0015] Beneficial Effects: Based on the structural characteristics of the slewing shaft system of the stabilizing platform, this invention designs a labyrinth protection structure. Through a multi-stage grating structure, the electromagnetic wave propagation path is extended, causing it to gradually attenuate during propagation. The proposed double-layer labyrinth structure has grates in the first and second layers perpendicular to each other. This perpendicular labyrinth path significantly increases the difficulty of electromagnetic wave propagation, creating a more complex and lossier propagation path, thus achieving a protection effect far exceeding that of a single-layer labyrinth. This double-layer labyrinth structure does not increase the rotational resistance of the slewing shaft system while achieving highly efficient electromagnetic protection, greatly improving the operational stability and reliability of the stabilizing platform. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0017] Figure 2 This is a cross-sectional structural diagram of the present invention.

[0018] Figure 3 This is a side view of the structure of the present invention.

[0019] Reference numerals: 1 Rotary shaft system, 2 Fork-shaped component, 3 Pitch frame, 4 Motor base, 41 Inner wall, 42 Outer wall, 43 Lower end face, 44 Top cover, 5 Torque motor, 6 Motor connecting shaft, 61 Horizontal part, 62 Vertical part, 7 Slip ring, 8 Rotary transformer, 81 Rotary transformer inner pressure ring, 82 Rotary transformer outer pressure ring, 9 Bearing, 91 Bearing inner pressure ring, 92 Bearing outer pressure ring, 10 Side cover, 11 First layer labyrinth structure, 12 Second layer labyrinth structure, 121 Labyrinth inner ring, 122 Labyrinth outer ring, 1221 Semicircular toothed ring. Detailed Implementation

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

[0021] like Figure 1-3 As shown, the stabilizing platform in this embodiment of the invention includes a rotation axis system 1 (azimuth axis system) disposed at the top, a fork-shaped component 2 (azimuth frame) connected below the rotation axis system 1, and a pitch frame 3 installed inside the fork-shaped component 2 via a pitch axis system. The pitch frame 3 further includes a roll axis system and a roll frame (not shown in the figure). The double-layer labyrinth protection structure of this invention is designed specifically for the rotation axis system 1 at the top; therefore, Figure 1 The pitch frame 3 is not shown in the image. Figure 2 The image mainly shows a sectional view of the upper part, namely the rotation axis 1. The sectional view of the internal structure of the pitch frame 3 is not shown.

[0022] like Figure 2 As shown, the rotary shaft system 1 includes a motor assembly and a motor base 4. The motor base 4 includes an inner wall 41, an outer wall 42, a lower end face 43, and a top cover 44. The inner wall 41 and the outer wall 42 are connected at the bottom through the lower end face 43. There is a cavity structure between the inner wall 41 and the outer wall 42. The top cover 44 is detachably installed on top of the outer wall 42. The cavity structure houses optoelectronic devices such as circuit boards for a stable platform. The inner wall 41 of the motor base 4 is designed with a stepped hole structure that matches the shape of the motor assembly for mounting the motor assembly.

[0023] The motor assembly includes a torque motor 5, a motor connecting shaft 6, a slip ring 7, and a rotary transformer 8. The torque motor 5 serves as a direct drive source, without a reduction gear, outputting high torque, low speed, and high response rotational power to achieve precise angular position control. It is the core power unit of the rotary shaft system 1. The torque motor 5 is mounted on a motor mount 4, and its rotor is connected to the motor connecting shaft 6 via screws. The motor connecting shaft 6 rigidly transmits the motor output torque to the load end (fork-shaped component 2), ensuring power transmission without delay or elastic deformation, and maintaining the overall rigidity and dynamic response characteristics of the system. The motor connecting shaft 6 is in the shape of an inverted "T". The structure includes a horizontal part 61 and a vertical part 62. The vertical part 62 is a hollow shaft with a slip ring 7 inside. The lower end of the slip ring 7 is fixedly connected to the motor connecting shaft 6. The fork-shaped part 2 is fixedly connected below the horizontal part 61 of the motor connecting shaft 6, which can drive the fork-shaped part 2 to rotate. A bearing 9 is provided between the motor connecting shaft 6 and the motor base 4. An inner pressure ring 91 and an outer pressure ring 92 are provided above the bearing 9. A rotary transformer 8 is provided in the space between the inner pressure ring 91 and the outer pressure ring 92. The upper end of the rotary transformer 8 is fixed by the inner pressure ring 81 and the outer pressure ring 82.

[0024] There is relative rotation between the motor connecting shaft 6 and the motor base 4. A fork-shaped component 2 is connected below the motor connecting shaft 6, and there is also relative rotation between the fork-shaped component 2 and the motor base 4. To ensure the rotational characteristics of the rotary shaft system 1, gaps must be maintained between these components. Specifically, there is a first gap between the upper end face of the horizontal portion 61 of the motor connecting shaft 6 and the lower end face 43 of the motor base 4, and a second gap between the lower end face 43 of the motor base 4 and the upper end face of the fork-shaped component 2. These gaps provide channels and paths for electromagnetic wave intrusion. To improve the electromagnetic protection function of the rotary shaft system 1, this invention designs a double-layer labyrinth protection structure. The first layer labyrinth structure 11 is set... The first gap is between the upper end face of the horizontal part 61 of the motor connecting shaft 6 and the lower end face 43 of the motor base 4. The lower edge of the motor base 4 is adjacent to the upper edge of the fork-shaped part 2. A second layer of labyrinth structure 12 is provided outside the two, that is, a second layer of labyrinth structure 12 is set outside the second gap. In order to enhance the protection effect, the first layer of labyrinth structure 11 and the second layer of labyrinth structure 12 adopt a mutually perpendicular sieve structure. Specifically, the first layer of labyrinth structure 11 adopts vertical sieves that interlock with each other, and the second layer of labyrinth structure 12 adopts horizontal sieves that interlock with each other. Through the two mutually perpendicular sieve structures, the electromagnetic wave intrusion path is complicated and extended, thereby improving the protection effect.

[0025] The first layer of maze structure 11 and the second layer of maze structure 12 are both made of aluminum alloy.

[0026] The first layer of the maze structure 11 is specifically provided as follows: the lower end face 43 of the motor base 4 is provided with a vertical tooth-like structure, and the upper end face of the horizontal part 61 of the motor connecting shaft 6 is provided with a vertical tooth-like structure. The two mesh with each other to form the first layer of the maze structure 11. The meshing length of the vertical tooth-like structure is not greater than the first gap, and a horizontal gap is maintained between each vertical tooth to not affect the rotation performance.

[0027] The second-layer maze structure 12 includes an inner maze ring 121 and an outer maze ring 122. The inner maze ring 121 is fixed to the lower edge of the motor base 4, and the outer maze ring 122 is fixed to the upper edge of the fork-shaped part 2. The inner maze ring 121 and the outer maze ring 122 are respectively horizontally toothed structures, and the two interlock to form the second-layer maze structure 12. Vertical gaps are maintained between each horizontal tooth to avoid affecting the rotation performance.

[0028] Furthermore, such as Figure 1 As shown, the inner labyrinth ring 121 is a circular structure, fixed to the outer edge of the lower edge of the motor base 4. For ease of installation, the outer labyrinth ring 122 is composed of two semi-circular toothed rings 1221, which are connected by screws to form a ring and fixed to the outer edge of the upper edge of the fork-shaped component 2. Specifically, the fork-shaped component 2 has side covers 10 on both sides to protect the components installed inside the fork-shaped component 2. In the part with the side covers 10, the outer labyrinth ring 122 is directly fixed to the side covers 10, and in the remaining part, the outer labyrinth ring 122 is directly fixed to the fork-shaped component 2.

[0029] The gap and bite length of the grates in the first layer of the labyrinth structure 11 are different from those in the second layer of the labyrinth structure 12. The number of teeth, length and gap of the grates in each layer of the labyrinth can be adjusted appropriately according to the requirements of electromagnetic protection.

[0030] As a further preferred embodiment, the first gap between the upper end face of the horizontal portion 61 of the motor connecting shaft 6 and the lower end face 43 of the motor base 4 is 6mm, the engagement length of the vertical grating structure is less than the first gap, the gap between each tooth of the vertical grating is 0.75mm, and the number of vertical gratings is 4-5; the maximum second gap between the lower end face 43 of the motor base 4 and the upper end face of the fork-shaped part 2 is 11.5mm, the gap between the horizontal gratings is 0.75mm, the engagement length is 30mm, and the number of horizontal gratings is 3-4.

[0031] This invention significantly extends the propagation path of electromagnetic waves through a double-layered maze, creating a more complex and loss-prone path that achieves a protection effect far exceeding that of a single-layered maze. After the electromagnetic waves are attenuated through the outer maze (the second layer), they need to search for and align with the inner maze (the first layer) again to enter the internal space. The process of searching and turning causes a significant energy attenuation, thereby improving the anti-electromagnetic interference capability of the rotating shaft system and enhancing the operational stability of the stable platform.

[0032] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A double-layer labyrinth electromagnetic protection rotary shaft system for stabilizing a platform, the rotary shaft system comprising a motor base and a motor assembly, the motor assembly being mounted on the motor base, the motor assembly comprising a torque motor and a motor connecting shaft, a fork-shaped component fixedly connected below the motor connecting shaft, the motor base having an internal cavity structure for housing optoelectronic devices for stabilizing the platform, characterized in that, The motor connecting shaft has an inverted "T" shaped structure. There is a first gap between the upper end face of the horizontal part of the motor connecting shaft and the lower end face of the motor base. A first layer of labyrinth structure is provided at the first gap. The first layer of labyrinth structure uses vertical grates that interlock with each other. There is a second gap between the lower end face of the motor base and the upper end face of the fork-shaped part. The lower edge of the motor base is adjacent to the upper edge of the fork-shaped part. A second layer of labyrinth structure is provided outside the two. The second layer of labyrinth structure uses horizontal grates that interlock with each other.

2. The double-layer labyrinth electromagnetic protection rotary shaft system for stabilizing a platform according to claim 1, characterized in that, The lower end face of the motor base and the upper end face of the horizontal part of the motor connecting shaft are respectively provided with vertical comb-like structures, which interlock to form the first layer of labyrinth structure.

3. The double-layer labyrinth electromagnetic protection rotary shaft system for stabilizing a platform according to claim 2, characterized in that, The engagement length of the vertical sieve-like structure is not greater than the first gap, and the gap between each tooth of the vertical sieve is 0.75mm.

4. The double-layer labyrinth electromagnetic protection rotary shaft system for stabilizing a platform according to claim 1, characterized in that, The second-layer maze structure includes an inner maze ring and an outer maze ring. The inner maze ring is fixed to the lower edge of the motor base, and the outer maze ring is fixed to the upper edge of the fork-shaped component. The inner and outer maze rings are respectively horizontally toothed structures, and they interlock to form the second-layer maze structure.

5. A double-layer labyrinth electromagnetic protection rotary shaft system for stabilizing a platform according to claim 4, characterized in that, The horizontal sieve teeth have a tooth gap of 0.75 mm and an engagement length of 30 mm.

6. A double-layer labyrinth electromagnetic protection rotary shaft system for stabilizing a platform according to claim 4, characterized in that, The inner ring of the maze is a circular structure and is fixed to the outside of the lower edge of the motor base.

7. A double-layer labyrinth electromagnetic protection rotary shaft system for stabilizing a platform according to claim 4, characterized in that, The outer ring of the maze consists of two semi-circular toothed rings, which are connected by screws to form a ring and fixed to the outer edge of the fork-shaped piece.

8. A double-layer labyrinth electromagnetic protection rotary shaft system for stabilizing a platform according to claim 1, characterized in that, Both the first and second layer maze structures are made of aluminum alloy.

9. A double-layer labyrinth electromagnetic protection rotary shaft system for stabilizing a platform according to claim 1, characterized in that, The motor base includes an inner wall, an outer wall, a lower end face, and a top cover. The inner wall and the outer wall are connected at the bottom through the lower end face, and there is a cavity structure between the inner wall and the outer wall. The top cover is detachably installed on the upper part of the outer wall.

10. A double-layer labyrinth electromagnetic protection rotary shaft system for stabilizing a platform according to claim 9, characterized in that, The inner wall of the motor mount is designed with a stepped hole structure that adapts to the shape of the motor assembly, and a bearing is provided between the motor mount and the motor connecting shaft.

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