Photoelectric stabilized platform rotating shaft system with electromagnetic shielding function

Abstract

The utility model relates to a photoelectric stabilized platform rotating shaft system with an electromagnetic shielding function, which comprises a shell, a bearing seat, a bearing and a rotating shaft, the bearing seat, the bearing and the rotating shaft are arranged in the shell, the bearing seat and the rotating shaft are coaxial through the bearing, and a bearing inner pressing ring and a bearing outer pressing ring are arranged on the inner end face of the bearing. The bearing inner pressing ring and the bearing outer pressing ring are both designed to be of a radial multi-labyrinth structure, the labyrinth faces of the bearing inner pressing ring and the bearing outer pressing ring correspond to each other, after axial and radial double positioning installation is conducted, it is guaranteed that a stable and uniform labyrinth gap is formed between the bearing inner pressing ring and the bearing outer pressing ring, and good electromagnetic shielding is achieved; the electromagnetic shielding structure has the characteristics of low resistance and miniaturization, and can improve the adaptability of the photoelectric stabilized platform in a complex environment.

Description

Technical Field

[0001] The utility model relates to the field of photoelectric platforms, in particular to electromagnetic shielding of a rotating shaft system of a photoelectric platform. Background Art

[0002] The optoelectronic stabilized platform is the most widely used over-the-horizon reconnaissance and sighting equipment at home and abroad. It is widely used on platforms such as drones and helicopters, and forms an all-weather, all-scenario working system with radar, communication and reconnaissance payloads. The strong radiation environment of radar, communication and reconnaissance poses a challenge to the normal operation of the optoelectronic stabilized platform. How to achieve low-resistance shielding of its rotating axis system is the basis for ensuring the normal and stable operation of the platform.

[0003] There are two main methods that are widely used at present: 1) Consider the impact of the electromagnetic environment when arranging the aircraft system load, and arrange the optoelectronic platform in a non-radiation area or a location with weak radiation. This method seriously affects the adaptability of the platform to the aircraft carrier. As the aircraft platform load increases, the area where this method is used is decreasing. 2) Two parts that rotate against each other on a rotating shaft system overlap each other to conduct electricity and achieve shielding. This method increases the rotational resistance torque of the shaft system, and as the overlapping surface wears for a long time, the shielding state may be affected.

[0004] The optoelectronic stabilized platform has the characteristics of compact structure space, complex electromagnetic environment, and high shaft resistance requirements. Therefore, developing an axis system with electromagnetic shielding function and low rotational resistance torque is necessary for the development of the optoelectronic stabilized platform and is of great significance. Utility Model Content

[0005] In view of the defects of the prior art, the utility model provides a rotating axis system of an optoelectronic stabilization platform with electromagnetic shielding function, which is applied to the azimuth and pitch axis systems of the optoelectronic stabilization platform. A low-clearance labyrinth bearing pressure ring is used to achieve electromagnetic shielding, and it has the characteristics of low resistance and miniaturization.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0007] A rotating shaft system of an optoelectronic stabilization platform with an electromagnetic shielding function comprises a shell, a bearing seat, a bearing and a rotating shaft arranged in the shell, the bearing seat is fixedly installed in the shell, a bearing is installed between the bearing seat and the rotating shaft, a bearing inner pressure ring and a bearing outer pressure ring are arranged on the inner end surface of the bearing, and the surfaces of the bearing inner pressure ring and the bearing outer pressure ring facing each other are designed with radial multiple labyrinth ring structures, and the labyrinth cylindrical surfaces of the two are coaxially designed and correspond to each other, the bearing inner pressure ring is installed on the end surface of the rotating shaft by screws and presses the bearing inner ring to achieve axial positioning, the bearing inner pressure ring is provided with a step surface in the axial direction and cooperates with the inner hole of the rotating shaft to achieve radial positioning, the bearing outer pressure ring is installed on the inner end surface of the bearing seat by screws and presses the bearing outer ring to achieve axial positioning, the bearing seat end surface is provided with a mounting hole matching the bearing outer pressure ring, and the bearing outer pressure ring cooperates with the mounting hole to achieve radial positioning, and after the bearing inner pressure ring and the bearing outer pressure ring are installed through radial and axial dual positioning, a stable axial gap and radial gap are formed between the labyrinth surfaces of the two to achieve electromagnetic shielding.

[0008] Furthermore, a boss is provided inside the shell, and a flange is provided outside the bearing seat, and the flange is connected to the boss by screws to achieve the installation of the bearing seat.

[0009] Furthermore, the contact surface between the boss and the flange is treated to be conductive, and an O-ring installation groove is provided on the surface of the boss in contact with the flange, and a conductive O-ring is installed in the O-ring installation groove.

[0010] Furthermore, the axial clearance is 0.2-0.3 mm, and the radial clearance is 0.2-0.3 mm.

[0011] Furthermore, the axial clearance is 0.2 mm, and the radial clearance is 0.2 mm.

[0012] Beneficial effects:

[0013] According to the principle that electromagnetic waves continuously lose energy during their reflection and propagation in a metal labyrinth, the utility model utilizes the high-precision positioning characteristics of bearings in each shaft system of the optoelectronic platform to design a multiple radial labyrinth structure with small gaps to achieve an electromagnetic shielding effect. Non-contact shielding is adopted without increasing the resistance torque of the shaft system, and the effect is stable and the structure is compact, which can improve the environmental adaptability of the rotating mechanism of precision loads such as optoelectronic stabilized platforms that have high requirements on the electromagnetic environment under complex carrier conditions such as UAVs and helicopters. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 A schematic diagram of the two-dimensional structure of the rotary shaft system of the utility model;

[0015] Figure 2 A schematic diagram of the three-dimensional structure of the rotary shaft system of the utility model.

[0016] Figure numerals: 1. housing, 2. bearing seat, 3. bearing, 4. rotating shaft, 5. bearing inner pressure ring, 6. bearing outer pressure ring, 7. conductive O-ring, 8. bearing seat external interface, 9. rotating shaft external interface. DETAILED DESCRIPTION

[0017] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0018] like Figure 1-2 As shown, a rotating shaft system of an optoelectronic stabilization platform with electromagnetic shielding function includes a housing 1, a bearing seat 2, a bearing 3 and a rotating shaft 4 installed in the housing 1. The bearing seat 2 is fixed in the housing 1 by screws, and the bearing 3 is installed between the rotating shaft 4 and the bearing seat 2. The bearing 3 is a high-precision bearing 3, and the inner end surface of the bearing 3 is provided with a bearing inner pressure ring 5 and a bearing outer pressure ring 6. The utility model utilizes the positioning and precision rotation characteristics of the high-precision bearing of the optoelectronic stabilization platform, and designs a bearing pressure ring with a high-precision, low-clearance radial multiple labyrinth structure to achieve an electromagnetic shielding effect.

[0019] The inner pressure ring 5 and the outer pressure ring 6 of the bearing are respectively designed with radial multiple labyrinth ring structures on the surfaces facing each other, and the labyrinth cylindrical surfaces of the two are coaxially designed and cooperate with each other. Among them, the inner pressure ring 5 of the bearing is installed on the end face of the rotating shaft 4 by screws and presses the inner ring of the bearing 3 to achieve axial positioning. The inner pressure ring 5 of the bearing is provided with a step surface in the axial direction and the outer diameter of the small shaft end cooperates with the inner hole of the rotating shaft 4 to achieve radial positioning. The outer pressure ring 6 of the bearing is installed on the inner end face of the bearing seat 2 by screws and presses the outer ring of the bearing 3 to achieve axial positioning. The inner end face of the bearing seat 2 is provided with a mounting hole matching the outer pressure ring 6 of the bearing. The outer pressure ring 6 of the bearing cooperates with the mounting hole to achieve radial positioning. After the inner pressure ring 5 and the outer pressure ring 6 of the bearing are installed with dual positioning in the radial and axial directions, there is a uniform and stable axial gap and radial gap between the labyrinth surfaces of the two to achieve electromagnetic shielding.

[0020] More specifically, if Figure 1 As shown, in the rotating shaft 4 system, the outer pressure ring 6 of the bearing and the bearing seat 2 are matched at the P1 surface to realize the coaxial design, and the inner pressure ring 5 of the bearing and the rotating shaft 4 are matched at the P2 surface to realize the coaxial design, the P1 surface of the bearing seat 2 (that is, the inner surface of the mounting hole for the outer pressure ring 6 of the bearing) is coaxially designed with the bearing mounting surface on the bearing seat 2, the P1 surface of the outer pressure ring 6 of the bearing is coaxially designed with the labyrinth cylindrical surfaces on the outer pressure ring, the P2 surface of the rotating shaft 4 (that is, the inner hole surface of the rotating shaft) is coaxially designed with the bearing mounting surface on the rotating shaft 4, and the P2 surface of the inner pressure ring 5 of the bearing (that is, the outer surface of the small shaft end at the step surface) is coaxially designed with the labyrinth cylindrical surfaces on the inner pressure ring. In this way, when the bearing seat 2, the bearing 3, the rotating shaft 4, the inner pressure ring 5 of the bearing, and the outer pressure ring 6 of the bearing are respectively arranged according to Figure 1As shown, after the assembly is completed under the condition that the P1 surface and the P2 surface are matched, it can be ensured that the labyrinth composed of the bearing inner pressure ring 5 and the bearing outer pressure ring 6 has uniform axial and radial clearances.

[0021] In other words, the bearing seat 2 and the outer pressure ring 6 of the bearing are coaxial at the P1 surface through high-precision axial hole matching, the rotating shaft 4 and the inner pressure ring 5 of the bearing are coaxial at the P2 surface through high-precision axial hole matching, and the rotating shaft 4 and the bearing seat 2 are coaxial through high-precision matching with the bearing 3. The above matching can achieve the coaxiality of the labyrinth rings on the inner pressure ring 5 of the bearing and the outer pressure ring 6 of the bearing, and achieve stable and controllable labyrinth radial clearance; the two bearing pressure rings are pressed on the end face of the bearing 3 by screws in the axial direction to achieve axial positioning, ensuring that the labyrinth axial clearance is stable and controllable. In specific applications, the utility model can achieve an axial clearance of 0.2-0.3mm and a radial clearance of 0.2-0.3mm between the labyrinth rings through high-precision radial and axial positioning and installation; the smaller the electromagnetic shielding gap, the larger the band range that can be shielded, and the better it can meet the high electromagnetic isolation requirements of the device in strong radiation environments such as airborne.

[0022] Furthermore, a boss is provided inside the housing 1, and a flange is provided outside the bearing seat 2, and the flange is connected to the boss by screws to realize the installation of the bearing seat 2. The contact surface between the boss and the flange, that is, the P3 surface, is subjected to conductive treatment, and an O-ring installation groove is provided on the surface of the boss in contact with the flange, and a conductive O-ring 7 is installed in the O-ring installation groove.

[0023] The utility model designs a multiple radial maze structure with small gaps based on the principle that electromagnetic waves continuously lose energy during reflection and propagation in a metal maze, utilizing the high-precision positioning characteristics of bearings in the photoelectric platform shaft system, thereby achieving an electromagnetic shielding effect. Furthermore, due to the non-contact shielding, the shaft system resistance will not be increased, the shielding effect is stable, and the environmental adaptability of the photoelectric stabilized platform under complex carrier conditions such as UAVs and helicopters is improved.

[0024] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technician familiar with the profession can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A rotating shaft system of an optoelectronic stabilization platform with electromagnetic shielding function, comprising a housing, a bearing seat, a bearing and a rotating shaft arranged in the housing, wherein the bearing seat is fixedly installed in the housing, a bearing is installed between the bearing seat and the rotating shaft, and an inner bearing pressure ring and an outer bearing pressure ring are arranged on the inner end surface of the bearing, characterized in that: The surfaces of the inner pressure ring and the outer pressure ring of the bearing facing each other are designed with radial multiple labyrinth ring structures, and the labyrinth cylindrical surfaces of the two are coaxially designed and correspond to each other. The inner pressure ring of the bearing is installed on the end face of the rotating shaft by screws and presses the inner ring of the bearing to achieve axial positioning. The inner pressure ring of the bearing is provided with a step surface in the axial direction and cooperates with the inner hole of the rotating shaft to achieve radial positioning. The outer pressure ring of the bearing is installed on the inner end face of the bearing seat by screws and presses the outer ring of the bearing to achieve axial positioning. The end face of the bearing seat is provided with a mounting hole matching the outer pressure ring of the bearing, and the outer pressure ring of the bearing cooperates with the mounting hole to achieve radial positioning. After the inner pressure ring and the outer pressure ring of the bearing are installed through radial and axial dual positioning, a stable axial gap and radial gap are formed between the labyrinth surfaces of the two to achieve electromagnetic shielding.

2. The photoelectric stabilization platform rotary axis system with electromagnetic shielding function according to claim 1 is characterized in that: A boss is arranged inside the shell, and a flange is arranged outside the bearing seat. The flange is connected to the boss by screws to realize the installation of the bearing seat.

3. The photoelectric stabilization platform rotary axis system with electromagnetic shielding function according to claim 2 is characterized in that: The contact surface between the boss and the flange is treated for electrical conductivity, and an O-ring installation groove is provided on the surface of the boss in contact with the flange, in which a conductive O-ring is installed.

4. The photoelectric stabilization platform rotary axis system with electromagnetic shielding function according to claim 1 is characterized in that: The axial clearance is 0.2-0.3 mm, and the radial clearance is 0.2-0.3 mm.

5. The photoelectric stabilization platform rotary axis system with electromagnetic shielding function according to claim 4 is characterized in that: The axial clearance is 0.2 mm, and the radial clearance is 0.2 mm.

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