Electromagnetic shielding seal structure for opto-electronic turntable rotation shaft

Abstract

The utility model discloses a kind of electromagnetic shielding seal structure for photoelectric rotary table rotating shaft system, belong to electromagnetic compatibility technical field.The structure includes fixed part and rotating motion part, fixed part is composed of bearing seat, sealing end cover, sealing end cover copper sleeve, beryllium copper reed and conductive seal ring, rotating motion part is composed of intermediate shaft, shield shaft and connecting disc;Bearing seat is fixed with bearing outer ring, beryllium copper reed is assembled after sealing end cover copper sleeve and is connected with sealing end cover, sealing end cover is sealed with bearing seat by conductive seal ring;Intermediate shaft is fixed with bearing inner ring, shield shaft and connecting disc, beryllium copper reed is extruded with shield shaft and keeps good physical contact.The utility model integrates shielding and sealing function, compact structure, design simplification, without multi-link regulation and control, directly target solution shaft system electromagnetic leakage problem, shielding efficiency is high, stability is strong, adapt photoelectric rotary table limited installation space demand, effectively improve shaft system electromagnetic sealing property.

Description

Technical Field

[0001] This utility model relates to the field of electromagnetic compatibility technology, specifically to an electromagnetic shielding and sealing structure for the rotating shaft system of an optoelectronic turntable. Background Technology

[0002] Electromagnetic compatibility (EMC) refers to the ability of various electrical equipment or systems to meet design requirements and operate normally within a shared space of complex electromagnetic environments, with a specified safety factor. As a core optoelectronic device installed on fixed supports, special vehicles, unmanned vehicles, and station systems for observation, detection, and distance measurement, the azimuth and pitch rotation axis system is an indispensable key component of the optoelectronic turntable.

[0003] To meet electromagnetic compatibility (EMC) requirements, the structural design of the rotating shaft system must focus on the rotating bearings and rotary seals. However, the clearances between the inner and outer rings of the rotating bearings, as well as the clearances of common groove seals and non-metallic sealing rings, are the main channels for electromagnetic radiation leakage from the photoelectric turntable. In EMC tests of individual and system-level photoelectric turntables, electromagnetic shielding of the rotating shaft system has always been a difficult technical challenge to overcome.

[0004] Current common electromagnetic shielding design methods mainly target the internal electrical components and wiring harnesses of the optoelectronic turntable: adding filters, common-mode inductors, and capacitors to filter circuit components with high interference; installing metal shielding covers around integrated circuit boards or electronic components with strong electromagnetic radiation; and wrapping high-radiation cables with anti-wave sleeves for shielding. These static electromagnetic shielding methods cut off the spatial propagation path of electromagnetic energy, thereby reducing electromagnetic radiation and overall leakage. However, this approach has significant drawbacks: it requires multiple tests for filter adaptation and selection, and is limited by internal space, weight, and cost; it is only suitable for static electromagnetic shielding inside a flat chamber and cannot quickly and effectively solve the electromagnetic radiation leakage problem of the dynamic part of the optoelectronic turntable's axis system; the design process is complex, and the shielding effect is subject to attenuation. Summary of the Invention

[0005] This invention provides a simple, efficient, and compact electromagnetic shielding and sealing structure for the rotating shaft system of an optoelectronic turntable, which solves the technical problem of electromagnetic radiation leakage at the rotating shaft system of the optoelectronic turntable, thereby significantly improving the electromagnetic sealing performance of the optoelectronic turntable shaft system.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: an electromagnetic shielding sealing structure for the rotating shaft system of an optoelectronic turntable, comprising a fixed part and a rotating part; The fixed part includes a bearing, a sealing end cap, a copper sleeve for the sealing end cap, a beryllium copper spring, and a conductive sealing ring. The bearing is tightly fitted and fixed to the outer rings of bearing one and bearing two of the photoelectric turntable. The beryllium copper spring is fixed to the copper sleeve for the sealing end cap. The copper sleeve for the sealing end cap is connected to the sealing end cap by countersunk screws. A conductive sealing ring is installed between the sealing end cap and the bearing, and the sealing end cap is fixedly connected to the bearing by screws. The rotating motion part includes an intermediate shaft, a shielding shaft, and a connecting plate. The inner rings of bearing one and bearing two are fixedly fitted to the intermediate shaft through structural limiting and pressure rings. The intermediate shaft is connected to the shielding shaft and the connecting plate by screws. The beryllium copper spring is pressed together with the shielding shaft. By controlling the deformation of the beryllium copper spring, the stationary part and the rotating part always maintain good physical contact.

[0007] The shielding shaft is made of titanium alloy.

[0008] The beryllium copper spring is fixed to the copper sleeve of the sealing end cap by soldering.

[0009] The conductive sealing ring is used to achieve sealing and conductive connection between the sealing end cap and the bearing.

[0010] The beryllium copper spring has the characteristics of high resilience, fatigue resistance, corrosion resistance, good conductivity and good temperature adaptability.

[0011] The electromagnetic shielding sealing structure for the rotating shaft system of an optoelectronic turntable designed using the above-mentioned technical solution has the following advantages compared with the prior art: 1. Simplified design: There is no need to control the interference source and coupling path in multiple steps, and no need to conduct multiple tests to adapt and select filters. The design can be directly integrated through shielded and sealed structure, which reduces the difficulty and cost of product design and subsequent production and debugging. 2. Compact structure: The shielding and sealing functions are integrated into the same structure, eliminating the need for additional shielding components, greatly reducing space occupation, and making it more suitable for the limited installation space requirements inside the optoelectronic turntable; 3. Highly efficient shielding: Designed specifically for the core leakage point of the rotating shaft system, the electromagnetic shielding and sealing effects act directly on the leakage location, resulting in higher blocking efficiency. It can stably and efficiently improve the electromagnetic sealing performance of the shaft system and significantly reduce the amount of electromagnetic radiation leakage. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the electromagnetic sealing structure of the rotating shaft system of the photoelectric turntable of this utility model; Figure 2 This is a schematic diagram of the beryllium copper spring structure of this utility model; Figure 3 for Figure 2 A top-view structural diagram; Figure 4 This is a schematic diagram of the copper sleeve structure of the sealing end cap of this utility model; Figure 5 for Figure 4 A top-view structural diagram; Figure 6 This is a schematic diagram of the shielding shaft structure of this utility model; Figure 7 for Figure 6 A top-view structural diagram.

[0013] In the diagram: 1-Sealed end cap, 2-Beryllium copper spring, 3-Shielding shaft, 4-Connecting disc, 5-Sealed end cap copper sleeve, 6-Conductive sealing ring, 7-Bearing seat, 8-Bearing 1, 9-Bearing 2, 10-Intermediate shaft. Detailed Implementation

[0014] The electromagnetic shielding and sealing structure for the rotating shaft system of an optoelectronic turntable according to this utility model will be described in detail below with reference to the accompanying drawings.

[0015] This utility model discloses an electromagnetic shielding and sealing structure for the rotating shaft system of an optoelectronic turntable. See [link to relevant documentation]. Figures 1 to 7 The system comprises a stationary part and a rotating part. The stationary part includes a bearing 7, a sealing end cap 1, a sealing end cap copper sleeve 5, a beryllium copper spring 2, and a conductive sealing ring 6. The beryllium copper spring 2 should have high resilience, fatigue resistance, corrosion resistance, good conductivity, and good temperature adaptability. The bearing 7 is tightly fitted and fixed to the outer rings of bearing 1 (8) and bearing 2 (9). The beryllium copper spring 2 is soldered to the sealing end cap copper sleeve 5. The sealing end cap copper sleeve 5 is connected to the sealing end cap 1 by countersunk screws. The conductive sealing ring 6 is installed between the sealing end cap 1 and the bearing 7, and the sealing end cap 1 is fixedly connected to the bearing 7 by screws. The conductive sealing ring 6 is used to achieve sealing and conductive connection between the sealing end cap 1 and the bearing 7. The rotating part includes an intermediate shaft 10, a shielding shaft 3, and a connecting plate 4. The shielding shaft 3 is made of titanium alloy. The inner rings of bearing 1 8 and bearing 2 9 are fixedly fitted to the intermediate shaft 10 through structural limiting and pressure rings. The intermediate shaft 10 is connected to the shielding shaft 3 and the connecting plate 4 by screws. The beryllium copper spring 2 is pressed and fitted with the shielding shaft 3. By controlling the deformation of the beryllium copper spring 2, the stationary part and the rotating part always maintain good physical contact.

[0016] The assembly and working process of the electromagnetic shielding sealing structure for the rotating shaft system of a photoelectric turntable according to this utility model is as follows: Assembly of stationary parts: The outer rings of bearing 1 (8) and bearing 2 (9) are fixed to the bearing housing 7 by an overtight fit to ensure the stability of the bearing installation; The beryllium copper spring 2 is soldered and fixed to the sealing end cap copper sleeve 5 to ensure good conductivity between the two, and the roundness of the beryllium copper spring 2 after welding is ensured by the structural characteristics of the sealing end cap copper sleeve 5. The sealing end cap copper sleeve 5, equipped with beryllium copper spring 2, is connected and fixed to the sealing end cap 1 by countersunk screws; A conductive sealing ring 6 is installed between the mating surfaces of the sealing end cap 1 and the bearing 7, and then the sealing end cap 1 and the bearing 7 are fixedly connected by screws to achieve sealing and electromagnetic isolation of the fixed part.

[0017] Assembly of rotating moving parts: The inner rings of bearing 8 and bearing 9 are fixedly fitted to the intermediate shaft 10 through structural limiting and pressure rings to ensure synchronous rotation of the bearing inner rings and the intermediate shaft. The intermediate shaft 10 is connected and fixed to the shielding shaft 3 and the connecting plate 4 in sequence by screws, forming a complete rotating motion part.

[0018] Overall fit and working principle of this utility model: The rotating part is rotatably fitted with the bearing seat 7 of the stationary part through bearing 8 and bearing 9. The beryllium copper spring 2 and the shielding shaft 3 are kept in a state of compression contact. Through the preset deformation design, it is ensured that the two always maintain good physical contact during the rotation of the turntable, which not only achieves mechanical sealing, but also forms an electromagnetic shielding path through metal contact to block electromagnetic radiation leakage. The titanium alloy shielding shaft 3 is flexibly bonded to the beryllium copper spring 2 with high resilience, which reduces frictional loss during relative rotation, while meeting the torque requirements of the motor rotation and ensuring the normal operation of the turntable.

[0019] Through the above assembly and fitting methods, this utility model achieves effective electromagnetic sealing shielding between the fixed part and the rotating part of the photoelectric turntable's rotating shaft system. The structure is simple, reliable, and highly adaptable.

Claims

1. An electromagnetic shield seal for a photoelectric turntable rotational shaft train, characterized by It includes a stationary part and a rotating part; The fixed part includes a bearing (7), a sealing end cap (1), a sealing end cap copper sleeve (5), a beryllium copper spring (2), and a conductive sealing ring (6). The bearing (7) is tightly fitted and fixed to the outer rings of the first bearing (8) and the second bearing (9) of the photoelectric turntable. The beryllium copper spring (2) is fixed on the sealing end cap copper sleeve (5). The sealing end cap copper sleeve (5) is connected to the sealing end cap (1) by countersunk screws. The conductive sealing ring (6) is installed between the sealing end cap (1) and the bearing (7). The sealing end cap (1) is fixedly connected to the bearing (7) by screws. The rotating motion part includes an intermediate shaft (10), a shielding shaft (3) and a connecting plate (4). The inner rings of bearing one (8) and bearing two (9) are fixedly fitted to the intermediate shaft (10) through structural limiting and pressure rings. The intermediate shaft (10) is connected to the shielding shaft (3) and the connecting plate (4) by screws. The beryllium copper spring (2) is pressed together with the shielding shaft (3). By controlling the deformation of the beryllium copper spring (2), the fixed part and the rotating part always maintain good physical contact.

2. An electromagnetic shield seal for a photoelectric turntable drive shaft as defined in claim 1 wherein The shielding shaft (3) is made of titanium alloy.

3. An electromagnetic shield seal for a photoelectric turntable drive shaft as defined in claim 1 wherein The beryllium copper spring (2) is fixed to the copper sleeve (5) of the sealing end cap by soldering.

4. An electromagnetic shield seal for a photoelectric turntable drive shaft as defined in claim 1 wherein The conductive sealing ring (6) is used to achieve sealing and conductive connection between the sealing end cap (1) and the bearing (7).

Images