Rotary table of anechoic chamber and antenna tower box shielding structure

Abstract

The utility model provides a rotary table and antenna tower box shielding structure of an anechoic chamber. The rotary table and antenna tower box shielding structure comprises a shielding box body, a driving mechanism covering the rotary table and an antenna tower and a control device. The shielding box body comprises six plate bodies including a shielding top plate, a shielding bottom plate, a shielding front plate, a shielding rear plate, a shielding left side plate and a shielding right side plate which are adjacently spliced in all directions to form the shielding box body; installation steps are arranged on the edges of the end faces, connected with the adjacent plate bodies, of the shielding front plate, the shielding rear plate, the shielding left side plate and the shielding right side plate, conductive cotton slivers are embedded in the installation steps, the corresponding end faces are attached when the adjacent plate bodies are spliced, the conductive cotton slivers are pressed in the installation steps, and gap shielding at the joint of the box body is achieved. The shielding structure is simple and convenient to install and maintain; according to electromagnetic radiation of a driving control part and a cable, comprehensive shielding design is carried out in the aspects of materials, thickness, heat dissipation hole distance and hole diameter, grounding, wiring and the like; and a mechanical output shaft hole of the box body is shielded by a double-woven conductive wire mesh liner.

Description

Technical Field

[0001] This utility model relates to the field of EMC testing technology, and in particular to a turntable and antenna tower housing shielding structure for an anechoic chamber. Background Technology

[0002] With the continuous development of electronic technology, electromagnetic interference problems are becoming increasingly serious. Therefore, electronic equipment often needs to undergo electromagnetic compatibility (EMC) testing in an anechoic chamber. During the testing process, the sample under test, transmitting antenna, and receiving antenna need to change positions within the anechoic chamber. Therefore, the antenna tower needs to be able to vertically raise and lower the antenna, tilt it, and change its polarization direction. The turntable needs to be able to rotate in both directions, and the test must be conducted in a background electromagnetic environment with low interference.

[0003] Traditional turntable-antenna tower systems employ a combination of asynchronous motors and frequency converters, which suffers from limited control methods and low motion accuracy, failing to meet the requirements of some high-precision, customized tests. Therefore, newer turntable-antenna tower systems often utilize a combination of servo motors and PLCs for their drive system.

[0004] However, the combined drive scheme of servo motor and PLC also introduces electromagnetic interference, different from traditional drives, into the turntable-antenna tower system. To ensure antenna tower displacement and turntable movement while minimizing electromagnetic interference introduced by the drive mechanism and control devices, and reducing vibration and noise generated by the drive mechanism, existing technologies typically encapsulate these components in a metal enclosure. However, because the interior of an anechoic chamber is extremely sensitive to electromagnetic signals, all electrically driven drive mechanisms and control devices are considered strong interference sources. Therefore, the existing shielded enclosures of turntable-antenna tower systems have the following problems:

[0005] 1. Pore Issues: Openings and gaps in the metal enclosure can compromise its airtightness. In high-frequency environments, electromagnetic waves can leak and diffract through these gaps, affecting the accuracy of test results. 2. Heat Dissipation Issues: Since the turntable-antenna tower system needs to operate continuously, its drive and control components generate a certain amount of heat. If the heat dissipation structure of the metal enclosure is not reasonable, it will affect the heat dissipation of its internal equipment. 3. Reflection Issues: When electromagnetic waves reach the surface of the metal enclosure, the impedance discontinuity at the air-metal interface will reflect the incident waves, causing interference to the internal equipment. 4. Cable Issues: The cables used for power supply and signal transmission between drive and control components will inevitably introduce electromagnetic signals. How to minimize unwanted electromagnetic signals is also a problem that must be solved. Utility Model Content

[0006] This invention proposes a shielding structure for the turntable and antenna tower housing of an anechoic chamber, in order to solve the technical problem that the existing turntable and antenna tower shielding housings have poor sealing performance, resulting in electromagnetic wave leakage and affecting EMC test results.

[0007] To solve the above problems, the technical solution adopted by this utility model is as follows:

[0008] This utility model provides a turntable and antenna tower enclosure shielding structure for an anechoic chamber, including:

[0009] A shielded enclosure is installed outside the drive mechanism and control device of the turntable and antenna tower;

[0010] The shielding enclosure consists of six panels: a top shielding plate, a bottom shielding plate, a front shielding plate, a rear shielding plate, a left shielding plate, and a right shielding plate. These six panels are joined together in each direction to form the shielding enclosure.

[0011] The edges of the shielding front plate, shielding rear plate, shielding left plate and shielding right plate that join with the adjacent plates are provided with mounting steps. Conductive cotton strips are embedded in the mounting steps. When the adjacent plates are spliced, the corresponding end faces are put together and the conductive cotton strips are pressed into the mounting steps.

[0012] Preferably, the shielding enclosure includes:

[0013] The antenna tower shielding box is installed outside the drive mechanism and control device of the antenna tower. The antenna tower shielding box includes an antenna tower box top plate, an antenna tower box bottom plate, an antenna tower box front plate, an antenna tower box rear plate, an antenna tower box left plate, and an antenna tower box right plate, which respectively serve as the shielding top plate, the shielding bottom plate, the shielding front plate, the shielding rear plate, the shielding left plate, and the shielding right plate.

[0014] The turntable shielding box is installed outside the drive mechanism and control device of the turntable. The turntable shielding box includes a turntable box top plate, a turntable box bottom plate, a turntable box front plate, a turntable box rear plate, a turntable box left plate, and a turntable box right plate, which respectively serve as the shielding top plate, the shielding bottom plate, the shielding front plate, the shielding rear plate, the shielding left plate, and the shielding right plate.

[0015] Preferably, the installation of the steps includes:

[0016] A front panel annular step is provided on the periphery of the inner wall of the front panel facing the inside of the antenna tower shielding box, and connects the four end faces of the front panel parallel to its thickness direction; a rear panel annular step is provided on the periphery of the inner wall of the rear panel facing the inside of the shielding box, and connects the four end faces of the rear panel parallel to its thickness direction; a pair of left-side strip-shaped steps are respectively provided on the inner wall of the left side panel facing the inside of the shielding box to connect the upper and lower edges of the top and bottom panels of the antenna tower box; a pair of right-side strip-shaped steps are respectively provided on the inner wall of the right side panel facing the inside of the shielding box to connect the upper and lower edges of the top and bottom panels of the antenna tower box.

[0017] A pair of front plate strip-shaped steps are respectively located on the inner side wall of the front plate of the turntable box facing the interior of the shielding box, connecting the upper and lower edges of the top plate and the bottom plate of the turntable box; a pair of rear plate strip-shaped steps are respectively located on the inner side wall of the rear plate of the turntable box facing the interior of the shielding box, connecting the upper and lower edges of the top plate and the bottom plate of the turntable box; a left side plate annular step is located on the periphery of the inner side wall of the left side plate of the turntable box facing the interior of the antenna tower shielding box, and connects the four end faces of the left side plate of the turntable box parallel to its thickness direction; a right side plate annular step is located on the periphery of the inner side wall of the right side plate of the turntable box facing the interior of the antenna tower shielding box, and connects the four end faces of the right side plate of the turntable box parallel to its thickness direction.

[0018] Preferably, the shielding enclosure is made of aluminum alloy sheet with a conductive anodized surface.

[0019] Preferably, the thickness of the shielding top plate and the shielding bottom plate is 8mm, and the thickness of the shielding front plate, the shielding rear plate, the shielding left side plate and the shielding right side plate is 12-13mm.

[0020] Preferably, the bottom plate of the antenna tower box is provided with a plurality of first bracket connection holes and antenna base connection holes;

[0021] Several second bracket connection holes are provided on the bottom plate of the turntable box;

[0022] The anechoic chamber's turntable and antenna tower enclosure shielding structure also includes:

[0023] Antenna tower housing motor frame, including:

[0024] A first supporting base plate is provided with a plurality of first base plate connection holes; a first mounting vertical plate is vertically connected to one end of the first supporting base plate, and the first mounting vertical plate is provided with a first motor mounting hole for mounting a motor.

[0025] The turntable box motor frame includes:

[0026] The second support base plate has several second base plate connection holes; the second mounting vertical plate is vertically connected to one end of the second support base plate, and the second mounting vertical plate has second motor mounting holes for mounting the motor.

[0027] The antenna tower box motor frame is installed inside the antenna tower shielding box by connecting it between the first base plate connection hole and the first bracket connection hole with a connector; the turntable box motor frame is installed inside the turntable shielding box by connecting it between the second base plate connection hole and the second bracket connection hole with a connector.

[0028] Preferably, the rear panel of the antenna tower box is provided with a first heat dissipation air inlet group, a first heat dissipation air outlet group, at least one air pipe connection flange, at least one first optical fiber connection flange and a first power input terminal, and the first power input terminal is provided with a filter;

[0029] The rear panel of the turntable box is provided with a second heat dissipation air outlet group, at least one second optical fiber connection flange, and a second power input terminal, the second power input terminal being equipped with a filter; the front panel of the turntable box is provided with a second heat dissipation air inlet group.

[0030] Preferably, the rear panel of the antenna tower box is also provided with a first power grounding terminal, which is connected to the total grounding point of the anechoic chamber, and the grounding terminals for the power supply of the antenna tower's drive mechanism and control device are respectively connected to the first power grounding terminal.

[0031] The turntable is also equipped with a second power grounding terminal on the rear plate. The second power grounding terminal is connected to the main grounding point of the anechoic chamber. The power grounding terminals of the turntable's drive mechanism and control device are respectively connected to the second power grounding terminal.

[0032] Preferably, at least one first output shaft through hole is provided on the left side plate and the right side plate of the antenna tower box, and two layers of conductive wire mesh pads are respectively provided at the corresponding connection points between the two ends of the first output shaft through hole and the inner side wall and the outer side wall of the right side plate of the antenna tower box.

[0033] The top plate of the turntable box is provided with at least one second output shaft through hole, and two layers of conductive wire mesh pads are respectively provided at the corresponding connection points between the two ends of the second output shaft through hole and the inner and outer side walls of the turntable box top plate.

[0034] Preferably, the shielding top plate, shielding bottom plate, shielding front plate, shielding rear plate, shielding left side plate and shielding right side plate are provided with a number of connection holes that match countersunk screws on their respective end faces where they meet the adjacent plates. The six plates are spliced ​​together and enclosed to form a shielding box by passing countersunk screws through the corresponding connection holes.

[0035] Compared with the prior art, the present invention has the following beneficial effects:

[0036] The anechoic chamber turntable and antenna tower enclosure shielding structure provided by this utility model features a pre-installed step at the joint of the enclosure panels. A fully-adhesive elastic conductive cotton strip is embedded in the installation step. When adjacent panels are joined, the corresponding end faces are pressed together, and the conductive cotton strip is tightly pressed into the installation step, thus shielding the gaps at the enclosure joints. Its shielding structure is simple, easy to install and maintain, and therefore the enclosure can be used for a long time. Based on the electromagnetic radiation frequency bands generated by drive and control components such as servo motors, PLCs, fiber optic modules, and solenoid valves, as well as power supply cables and signal cables, a comprehensive and targeted shielding design is implemented, considering materials, thickness, heat dissipation hole spacing and diameter, grounding, wiring, and filtering. This improves the electromagnetic interference resistance of the enclosure and ultimately achieves the shielding effectiveness required for EMC testing. The mechanical output shaft hole of the enclosure uses a double-woven tin-plated copper wire mesh pad for shielding, ensuring good conductivity and shielding effectiveness while the double-woven structure provides good mechanical elasticity, extending the service life of the conductive wire mesh pad. Attached Figure Description

[0037] To more clearly illustrate the technical solution proposed by this utility model, the present utility model will be described in detail below with reference to the embodiments and accompanying drawings. It should be understood that the specific embodiments described below and the accompanying drawings are only some embodiments of this utility model, and those skilled in the art can make changes to these drawings under the concept of this utility model.

[0038] Figure 1 A top view of the top plate of the antenna tower box, which is an embodiment of the anechoic chamber turntable and antenna tower box shielding structure provided by this utility model.

[0039] Figure 2 A top view of the bottom plate of the antenna tower box, which is an embodiment of the anechoic chamber turntable and antenna tower box shielding structure provided by this utility model.

[0040] Figure 3 A schematic diagram of the front panel of the antenna tower box, representing an embodiment of the anechoic chamber turntable and antenna tower box shielding structure provided by this utility model.

[0041] Figure 4 A schematic diagram of the main structure of the rear panel of the antenna tower box, representing an embodiment of the anechoic chamber turntable and antenna tower box shielding structure provided by this utility model.

[0042] Figure 5 for Figure 4 A top view of the front panel of the antenna tower box;

[0043] Figure 6 for Figure 4 A side view of the front panel of the antenna tower box;

[0044] Figure 7A schematic diagram of the main structure of the left side plate of the antenna tower box, which is an embodiment of the turntable and antenna tower box shielding structure of the anechoic chamber provided by this utility model.

[0045] Figure 8 for Figure 7 A top view of the left side panel of the antenna tower box;

[0046] Figure 9 for Figure 7 A side view of the left side panel of the antenna tower box;

[0047] Figure 10 A schematic diagram of the flattened structure of the antenna tower box motor frame, which is an embodiment of the anechoic chamber turntable and antenna tower box shielding structure provided by this utility model.

[0048] Figure 11 A front view of the antenna tower box assembly structure of an embodiment of the anechoic chamber turntable and antenna tower box shielding structure provided by this utility model;

[0049] Figure 12 A top view of the antenna tower box assembly structure of an embodiment of the anechoic chamber turntable and antenna tower box shielding structure provided by this utility model.

[0050] Figure 13 A side view of the antenna tower box assembly structure of an embodiment of the anechoic chamber turntable and antenna tower box shielding structure provided by this utility model;

[0051] Figure 14 A top view of the top plate of the turntable box in an embodiment of the anechoic chamber turntable and antenna tower box shielding structure provided by this utility model.

[0052] Figure 15 A top view of the bottom plate of the turntable box in an embodiment of the anechoic chamber turntable and antenna tower box shielding structure provided by this utility model.

[0053] Figure 16 A schematic diagram of the main view of the front panel of the turntable box in an embodiment of the anechoic chamber turntable and antenna tower housing shielding structure provided by this utility model.

[0054] Figure 17 for Figure 16 A top view of the front panel of the turntable box;

[0055] Figure 18 for Figure 16 A side view of the front panel of the turntable box;

[0056] Figure 19 A schematic diagram of the main structure of the rear plate of the turntable box of the anechoic chamber and the shielding structure of the antenna tower box provided in this utility model.

[0057] Figure 20 for Figure 19 A top view of the rear panel of the turntable box in an embodiment;

[0058] Figure 21 for Figure 19 A side view of the rear panel of the turntable box;

[0059] Figure 22 A schematic diagram of the main structure of the left side plate of the turntable box in an embodiment of the anechoic chamber turntable and antenna tower housing shielding structure provided by this utility model.

[0060] Figure 23 for Figure 22 A top view of the left side panel of the turntable box;

[0061] Figure 24 for Figure 22 A side view of the left side panel of the turntable box;

[0062] Figure 25 A schematic diagram of the flattened structure of the turntable box motor frame of an embodiment of the anechoic chamber turntable and antenna tower box shielding structure provided by this utility model.

[0063] Figure 26 A schematic diagram of the flattened structure of the speed reducer mounting bracket in an embodiment of the anechoic chamber turntable and antenna tower housing shielding structure provided by this utility model.

[0064] The main markings in the attached figures are as follows:

[0065] 1. Antenna tower shielding box; 11. Antenna tower box top plate; 12. Antenna tower box bottom plate; 121. First bracket connection hole; 122. Antenna base connection hole; 13. Antenna tower box front plate; 131. Front plate annular step; 14. Antenna tower box rear plate; 141. Rear plate annular step; 142. First heat dissipation air inlet group; 143. First heat dissipation air outlet group; 144. Air pipe connection flange; 145. First fiber optic connection flange; 46. ​​First power input terminal; 15. Left side panel of antenna tower box; 151. Strip-shaped step on the left side panel; 16. Right side panel of antenna tower box; 161. Strip-shaped step on the right side panel; 2. Turntable shielding box; 21. Top panel of turntable box; 211. Second output shaft through hole; 22. Bottom panel of turntable box; 221. Second bracket connection hole; 222. Third bracket connection hole; 23. Front panel of turntable box; 231. Strip-shaped step on the front panel; 232. Second heat dissipation... 24. Air inlet assembly; 241. Turntable box rear plate; 242. Rear plate strip step; 243. Second power input terminal; 244. Second heat dissipation air outlet assembly; 245. Second fiber optic connection flange; 25. Turntable box left side plate; 251. Left side plate annular step; 252. Angle iron connection hole; 3. Fixing hole; 4. Connection hole position; 5. Antenna tower box motor frame; 51. First support base plate; 511. First base plate connection hole; 52. First mounting vertical plate; 521. First motor mounting hole; 6. Turntable box motor frame; 61. Second support base plate; 611. Second base plate connection hole; 62. Second mounting vertical plate; 621. Second motor mounting hole; 7. First output shaft through hole; 71. Countersunk groove; 8. Reducer mounting bracket; 81. Third support base plate; 811. Third base plate connection hole; 82. Third mounting vertical plate; 83. Reducer support plate; 831. Reducer mounting slot. Detailed Implementation

[0066] To make the technical problem to be solved, the technical solution and the beneficial effects of this utility model clearer, the following description is provided in conjunction with the appendix. Figure 1-26 The present invention will be further described in detail with reference to the embodiments.

[0067] Please refer to the following: Figure 1-26 The anechoic chamber (not shown in the figure) turntable and antenna tower housing shielding structure provided by this utility model includes:

[0068] The shielding enclosure is installed outside the drive mechanism (not shown) and control device (not shown) of the turntable (not shown) and antenna tower (not shown). The shielding enclosure comprises six plates: a top shielding plate, a bottom shielding plate, a front shielding plate, a rear shielding plate, a left shielding plate, and a right shielding plate. These six plates are joined adjacently in each direction to form the shielding enclosure. The edges of the end faces of the front, rear, left, and right shielding plates where they join adjacent plates are provided with mounting steps. Conductive cotton strips (not shown) are embedded in these mounting steps. When adjacent plates are joined, the corresponding end faces are pressed together, compressing the conductive cotton strips within the mounting steps.

[0069] Please refer to the following: Figure 1-26 In this embodiment, the shielding enclosure includes:

[0070] The antenna tower shielding box 1 is installed outside the drive mechanism and control device of the antenna tower. The antenna tower shielding box 1 includes an antenna tower box top plate 11, an antenna tower box bottom plate 12, an antenna tower box front plate 13, an antenna tower box rear plate 14, an antenna tower box left plate 15, and an antenna tower box right plate 16, which respectively serve as the shielding top plate, shielding bottom plate, shielding front plate, shielding rear plate, shielding left plate, and shielding right plate.

[0071] The turntable shielding box 2 is installed outside the drive mechanism and control device of the turntable. The turntable shielding box 2 includes a turntable box top plate 21, a turntable box bottom plate 22, a turntable box front plate 23, a turntable box rear plate 24, a turntable box left plate 25, and a turntable box right plate (not shown in the figure), which respectively serve as the shielding top plate, shielding bottom plate, shielding front plate, shielding rear plate, shielding left plate, and shielding right plate.

[0072] Please refer to the following: Figure 5 , 6 In this embodiment, the installation of steps includes: (List of steps 8, 9, 11-13, 17, 18, 20, 21, 23, 24)

[0073] A front plate annular step 131 is provided on the periphery of the inner sidewall of the front plate 13 facing the interior of the antenna tower shielding box 1, and connects to the four end faces of the front plate 13 parallel to its thickness direction; a rear plate annular step 141 is provided on the periphery of the inner sidewall of the rear plate facing the interior of the shielding box, and connects to the four end faces of the rear plate 14 parallel to its thickness direction; the front view and side view structural schematic diagrams of the front plate 13 are the same as those of the rear plate 14, so their attached drawings are omitted. The structure of the front plate annular step 131 is described in [reference needed]. Figure 5 Antenna tower box rear panel 14 main view structural schematic diagram and Figure 6 The top view of the antenna tower box rear panel 14 shows the annular step 141 on the rear panel, and the two structures are identical.

[0074] A pair of left-side strip-shaped steps 151 are respectively located on the inner sidewall of the left side plate 15 of the antenna tower box facing the interior of the shielding box, connecting the upper and lower edges of the top plate 11 and the bottom plate 12 of the antenna tower box; a pair of right-side strip-shaped steps 161 are respectively located on the inner sidewall of the right side plate 16 of the antenna tower box facing the interior of the shielding box, connecting the upper and lower edges of the top plate 11 and the bottom plate 12 of the antenna tower box; the structure of the right side plate 16 of the antenna tower box is the same as that of the left side plate 15 of the antenna tower box, so its independent attached drawing is omitted; the structure of the right side strip-shaped steps 161 is shown in [reference needed]. Figure 8 Top view of the left side panel 15 of the antenna tower box and Figure 9 The description of the strip-shaped step 151 on the left side plate 15 in the side view structural schematic diagram of the antenna tower box is the same as that of the two.

[0075] A pair of front plate strip-shaped steps 231 are respectively provided on the inner side wall of the front plate 23 of the turntable box facing the interior of the shielding box to connect the upper and lower edges of the top plate 21 and the bottom plate 22 of the turntable box; a pair of rear plate strip-shaped steps 241 are respectively provided on the inner side wall of the rear plate 24 of the turntable box facing the interior of the shielding box to connect the upper and lower edges of the top plate 21 and the bottom plate 22 of the turntable box.

[0076] A ring-shaped step 251 on the left side plate is located on the periphery of the inner wall of the left side plate 25 of the turntable box facing the interior of the antenna tower shielding box 1, and connects to the four end faces of the left side plate 25 parallel to its thickness direction. A ring-shaped step on the right side plate (not shown in the figure) is located on the periphery of the inner wall of the right side plate of the turntable box facing the interior of the antenna tower shielding box 1, and connects to the four end faces of the right side plate of the turntable box parallel to its thickness direction. The structure of the right side plate of the turntable box is the same as that of the left side plate 25, so its separate attached drawing is omitted. The structure of the ring-shaped step on the right side plate is shown in [reference needed]. Figure 23 Top view of the left side panel of the turntable box (25) Figure 24 The side view of the left side plate 25 of the turntable box shows the description of the annular step 251 on the left side plate, and the two have the same structure.

[0077] When assembling the antenna tower shielding box 1, first assemble the antenna tower box base plate 12 onto the corresponding support platform of the antenna tower. Then, sequentially assemble the antenna tower box front plate 13, antenna tower box left side plate 15, antenna tower box right side plate 16, and antenna tower box rear plate 14 adjacently onto the top periphery of the antenna tower box base plate 12. The corresponding end faces of the adjacent plates are then fitted together to press the conductive cotton strips pre-embedded on the corresponding installation steps into the installation steps. Finally, cover the top of the antenna tower box front plate 13, antenna tower box left side plate 15, antenna tower box right side plate 16, and antenna tower box rear plate 14 and secure them tightly, thus completing the assembly of the antenna tower shielding box 1.

[0078] For the assembly method of turntable shielding box 2, please refer to [link / reference]. Figure 11-13The description of the assembly method of the antenna tower shielding box 1 above will not be repeated here.

[0079] Please see Figure 22 As a preferred embodiment of this embodiment, both the left side plate 25 and the right side plate of the turntable box are provided with at least one angle iron connection hole 252. By passing a connector (not shown in the figure) through the connection hole 4 of the mounting base of the turntable and the preset hole on the connecting angle iron (not shown in the figure), the left side plate 25 and the right side plate of the turntable box are respectively fastened to the mounting base of the turntable through the connecting angle iron.

[0080] In a preferred embodiment, the conductive cotton strip is a fully adhesive, elastic strip. During the assembly of adjacent plates of the shielding box, the corresponding end faces are pressed together to press the pre-embedded fully adhesive conductive cotton strip, which is embedded in the corresponding mounting step, into the mounting step. This tight fit reduces electromagnetic wave leakage. Simultaneously, the conductive cotton strip is made of elastic material to ensure effective contact pressure after assembly, achieving a complete seal.

[0081] In this embodiment, the shielding enclosure is made of aluminum alloy sheet with a conductive anodized surface.

[0082] In a preferred embodiment of this invention, the shielding enclosure is made of 6061 aluminum alloy. The main alloying elements of 6061 aluminum alloy are aluminum, magnesium, and silicon, which have good corrosion resistance and weldability. Conductive oxidation treatment on its surface not only enhances the shielding effect but also provides a certain degree of wear resistance, making its matte texture more aesthetically pleasing.

[0083] In this embodiment, the thickness of the top and bottom shielding plates is 8mm, and the thickness of the front, rear, left, and right shielding plates is 12-13mm. This ensures sufficient space for installing conductive sealing strips while providing a high shielding effect and facilitating assembly between the various plates. The formula for calculating the thickness of the shielding layer (i.e., the plates used in the shielding enclosure) and the electromagnetic absorption rate is as follows:

[0084]

[0085] The parameters are defined as follows: d is the shielding layer thickness, f is the electromagnetic wave frequency, and σ is the electromagnetic wave frequency. f μ represents the conductivity of the shielding material relative to copper. f The magnetic permeability of the shielding material.

[0086] Please see Figure 4 , 19In this embodiment, the rear panel 14 of the antenna tower housing is provided with a first heat dissipation air inlet group 142, a first heat dissipation air outlet group 143, at least one air pipe connecting flange 144, at least one first optical fiber connecting flange 145, and a first power input terminal 146, the first power input terminal 146 being equipped with a filter. The rear panel 24 of the turntable housing is provided with a second heat dissipation air outlet group 243, at least one second optical fiber connecting flange 244, and a second power input terminal 242, the second power input terminal 242 being equipped with a filter. The front panel 23 of the turntable housing is provided with a second heat dissipation air inlet group 232. The filter can filter the corresponding power supplies of the antenna tower housing and the turntable housing to obtain clean power.

[0087] Please see Figure 4 , 19 In a preferred embodiment, the first heat dissipation air inlet group 142 and the first heat dissipation air outlet group 143 are spaced apart on the left and right sides of the antenna tower box rear plate 14. Multiple air pipe connecting flanges 144, multiple first optical fiber connecting flanges 145, a first power input terminal 146, and a filter are located between the first heat dissipation air inlet group 142 and the first heat dissipation air outlet group 143. The second heat dissipation air outlet group 243 is located on one side of the turntable box rear plate 24, and the second optical fiber connecting flange 244, the second power input terminal 242, and the filter are located on the opposite side of the turntable box rear plate 24. The second heat dissipation air inlet group 232 is located on one side of the turntable box front plate 23.

[0088] For a more preferred implementation method in this embodiment, please refer to the following: Figure 1-13 The top plate 11 and bottom plate 12 of the antenna tower box are both made of rectangular plates with a thickness of 8mm, a length of 520mm, and a width of 422mm. The front plate 13 and rear plate 14 of the antenna tower box are both made of rectangular plates with a thickness of 12mm, a length of 422mm, and a width (height) of 150mm. The annular step 131 of the front plate is a rectangular annular step set around a rectangular boss with a thickness of 4mm, a length of 396mm, and a width (height) of 140mm. The annular step 141 of the rear plate is a rectangular annular step set around a rectangular boss with a thickness of 4mm, a length of 398mm, and a width (height) of 140mm. The left side panel 15 and the right side panel 16 of the antenna tower box are both rectangular plates with a thickness of 12mm, a length of 504mm, and a width (height) of 150mm. The strip-shaped steps 151 on the left side panel and the strip-shaped steps 161 on the right side panel are rectangular steps with a thickness of 5mm, a length of 504mm, and a width (height) of 4mm.

[0089] Please refer to the following: Figure 14-24The top plate 21 and bottom plate 22 of the turntable box are both made of rectangular plates with a thickness of 8mm, a length of 390mm, and a width of 360mm. The front plate and rear plate of the turntable are both made of rectangular plates with a thickness of 12mm, a length of 374mm, and a width (height) of 154mm. The strip-shaped steps 231 of the front plate and 241 of the rear plate are both made of rectangular steps with a thickness of 124mm, a length of 374mm, and a width (height) of 5mm. The left and right plates of the turntable are both made of rectangular plates with a thickness of 4mm, a length of 360mm, and a width (height) of 154mm. The annular steps 251 of the left plate and the annular steps of the right plate are both rectangular annular steps set around the periphery of a rectangular boss with a thickness of 4mm, a length of 338mm, and a width (height) of 144mm.

[0090] Please see Figure 4 , 19 In this embodiment, the first heat dissipation air inlet group 142, the first heat dissipation air outlet group 143, the second heat dissipation air inlet group 232, and the second heat dissipation air outlet group 243 are all arranged in a rectangular array with a side length of 70mm, and the distance between adjacent air inlets and outlets is 10mm, and the hole spacing between each air inlet and outlet is 3.4mm. The diameter of the air pipe connecting flange 144 is 14mm, and a pair of fixing holes 3 with a diameter of 3mm are provided on both sides of the first optical fiber connecting flange 145 and the second optical fiber connecting flange 244.

[0091] The diameter, spacing, depth, and distribution of the ventilation holes on the shielding enclosure directly affect the shielding effect, and are also related to the heat dissipation area and efficiency of the shielding enclosure.

[0092] The formula for calculating the cutoff frequency of the circular waveguide with the heat dissipation hole (TE11 mode) is as follows:

[0093] F c = (1.8412 × c) / (2πa)

[0094] Where c is the speed of light in a vacuum, and a is the radius of the waveguide's circular cross-section (in meters).

[0095] Please refer to the following: Figure 1-24 In this embodiment, the shielding top plate, shielding bottom plate, shielding front plate, shielding rear plate, shielding left side plate and shielding right side plate are provided with a number of connection holes 4 that match countersunk screws on their respective end faces where they are joined with adjacent plates. The six plates are spliced ​​together and enclosed to form a shielding box by passing countersunk screws through the corresponding connection holes 4.

[0096] Please refer to the following: Figure 1-24As a preferred embodiment of this invention, the hole spacing of adjacent connecting holes 4 in the antenna tower box top plate 11, antenna tower box bottom plate 12, antenna tower box front plate 13, antenna tower box rear plate 14, antenna tower box left side plate 15, and antenna tower box right side plate 16 is 65-68mm; the hole spacing of adjacent connecting holes 4 in the turntable box top plate 21, turntable box bottom plate 22, turntable box front plate 23, and turntable box rear plate 24 is 60-62mm; and the hole spacing of adjacent connecting holes 4 in the turntable box left side plate 25 and turntable box right side plate is 60-75mm.

[0097] When designing the enclosure connection holes 4 of the shielding enclosure, the hole spacing must take into account the shielding effectiveness of the hole array. In addition, using countersunk screws with stronger sealing properties can prevent the nuts from protruding from the surface of the shielding enclosure plate, thereby increasing the sealing of the connection holes 4 and further reducing electromagnetic wave leakage.

[0098] Please refer to the following: Figure 2 , 10 In this embodiment, the antenna tower box base plate 12 is provided with a plurality of first bracket connection holes 121 and antenna base connection holes 122, and the turntable box base plate 22 is provided with a plurality of second bracket connection holes 221.

[0099] The anechoic chamber's turntable and antenna tower enclosure shielding structure also includes:

[0100] The antenna tower box motor frame 5 includes: a first supporting base plate 51, which has a plurality of first base plate connection holes 511; a first mounting vertical plate 52, which is vertically connected to one end of the first supporting base plate 51, and the first mounting vertical plate 52 has a first motor mounting hole 521 for mounting a corresponding motor; the turntable box motor frame 6 includes: a second supporting base plate 61, which has a plurality of second base plate connection holes 611; a second mounting vertical plate 62, which is vertically connected to one end of the second supporting base plate 61, and the second mounting vertical plate 62 has a second motor mounting hole 621 for mounting a corresponding motor.

[0101] The antenna tower box motor frame 5 is installed inside the antenna tower shielding box 1 by connecting the first base plate connection hole 511 and the first bracket connection hole 121 with connectors. The turntable box motor frame 6 is installed inside the turntable shielding box 2 by connecting the second base plate connection hole 611 and the second bracket connection hole 221 with connectors. The antenna tower box is installed on the antenna tower by connecting the antenna base connection hole 122 and the corresponding mounting holes on the antenna tower mounting base with connectors.

[0102] Please refer to the following: Figure 7 , 9In this embodiment, the left side plate 15 and the right side plate 16 of the antenna tower box are provided with at least one first output shaft through hole 7. Two layers of conductive wire mesh pads (not shown in the figure) are respectively provided at the corresponding connection points between the two ends of the first output shaft through hole 7 and the inner and outer side walls of the right side plate 16 of the antenna tower box. The top plate 21 of the turntable box is provided with at least one second output shaft through hole 211. Two layers of conductive wire mesh pads (not shown in the figure) are respectively provided at the corresponding connection points between the two ends of the second output shaft through hole 211 and the inner and outer side walls of the top plate of the turntable box.

[0103] Please refer to the following: Figure 7 , 9 In the preferred embodiment of this example, the first output shaft through-hole 7 and the second output shaft through-hole 211 are both countersunk holes with a diameter of 18mm. The connection between the first output shaft through-hole 7 and the corresponding inner sidewalls of the left side plate 15 and the right side plate 16 of the antenna tower box is provided with a countersunk groove 71 with a diameter of 50mm and a thickness (depth) of 3mm, for installing the output end of the corresponding motor's reducer.

[0104] Please refer to the following: Figure 14 , 15 26. As a more preferred embodiment, the second output shaft through hole 211 serves as the output end mounting hole for the corresponding motor reducer, and several third bracket connection holes 222 are also provided on the turntable box bottom plate 22.

[0105] The anechoic chamber's turntable and antenna tower enclosure shielding structure also includes:

[0106] The speed reducer mounting bracket 8 includes: a third support base plate 81, which has at least one third base plate connection hole 811; a third mounting vertical plate 82, which is vertically connected to one end of the third support base plate 81; and a speed reducer support plate 83, which is vertically connected to one end of the mounting vertical plate opposite to the third support base plate 81 and is arranged parallel to the third support base plate 81. The speed reducer support plate 83 has a speed reducer mounting groove 831 for mounting a speed reducer corresponding to the motor.

[0107] The reducer mounting bracket 8 is installed inside the turntable shielding box 2 by connecting the third base plate connecting hole 811 and the third bracket connecting hole 222 with a connector. At the same time, the main body of the reducer corresponding to the motor is installed on the reducer mounting slot 831, and the output end of the corresponding motor is installed through the second output shaft through hole 211 and extends out of the turntable shielding box 2.

[0108] As a preferred embodiment of this invention, the conductive wire mesh pad is a pad woven from highly conductive metal wires, preferably woven from tin-plated copper wires, so that the conductive wire mesh pad serves as a shielding structure for the mechanical output shaft, ensuring good conductivity while also having a certain degree of oxidation resistance.

[0109] As a preferred embodiment of this invention, the conductive wire mesh gasket is a 15-mesh, double-woven wire mesh gasket. Since a 15-mesh conductive wire mesh gasket has poor elasticity, the double-woven structure satisfies the requirements for electromagnetic shielding while also providing good mechanical elasticity, thus extending the service life of the conductive wire mesh gasket.

[0110] In this embodiment, the connecting component is preferably a connecting screw or a connecting bolt.

[0111] In this embodiment, the shielding enclosure is provided with an enclosure grounding point (not shown in the figure), which is connected to the main grounding point of the anechoic chamber (not shown in the figure). The grounding terminals of the power supply for the drive mechanism and the control device are respectively connected to the enclosure grounding point.

[0112] As a preferred embodiment of this example, the rear plate 14 of the antenna tower box is also provided with a first power grounding terminal (not shown in the figure) which serves as the grounding point of the aforementioned box. The first power grounding terminal is connected to the total grounding point of the anechoic chamber (not shown in the figure), and the grounding terminals for power supply of the antenna tower's drive mechanism and control device are respectively connected to the first power grounding terminal.

[0113] The turntable is also provided with a second power grounding terminal (not shown in the figure) which serves as the grounding point of the aforementioned enclosure. The second power grounding terminal is connected to the main grounding point of the anechoic chamber, and the grounding terminals for the power supply of the turntable's drive mechanism and control device are respectively connected to the second power grounding terminal.

[0114] In a preferred embodiment, all 24V power supply grounding terminals of the drive mechanism and control device within the shielded enclosure are connected to the enclosure grounding point, and then connected to the unified total grounding point of the entire anechoic chamber. All 220V power supply grounding terminals of the antenna tower's drive mechanism and control device are connected to the first power supply grounding terminal, which is the enclosure grounding point, and then connected to the unified total grounding point of the entire anechoic chamber. All 220V power supply grounding terminals of the turntable's drive mechanism and control device are connected to the second power supply grounding terminal, which is the enclosure grounding point, and then connected to the unified total grounding point of the entire anechoic chamber. The turntable and antenna tower enclosure shielding structure for the anechoic chamber provided by this invention uses unified grounding in its electromagnetic compatibility design, ensuring that all electrical components within the shielded enclosure are connected to the same grounding point, thereby reducing the loop area in the circuit.

[0115] In this embodiment, the signal lines inside the shielded enclosure are routed using twisted-pair cables with ferrite cores, and the cables are routed as close as possible to the bottom edge of the enclosure. In electromagnetic compatibility design, twisted-pair cables, by twisting two insulated wires together, can reduce external electromagnetic interference. Similarly, adding ferrite cores to power lines and long cables can suppress electromagnetic interference.

[0116] In this embodiment, the aforementioned drive mechanism and control device include drive and control components such as servo motors, PLCs, fiber optic modules, and solenoid valves, and the shielding enclosure is used to shield the electromagnetic radiation frequency band interference generated during its operation.

[0117] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Those skilled in the art should understand that any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A turntable and antenna tower box shielding structure of an anechoic chamber, characterized by, Comprise: Shielding box, cover in the driving mechanism and control device of the antenna tower and the rotating table outside; The shielding box comprises six plate bodies, i.e., a shielding top plate, a shielding bottom plate, a shielding front plate, a shielding rear plate, a shielding left side plate and a shielding right side plate, which are adjacently spliced in respective directions and surround the shielding box; The edges of the respective end surfaces of the shielding front plate, the shielding rear plate, the shielding left side plate and the shielding right side plate and the adjacent plate bodies are provided with mounting steps, the mounting steps are embedded with conductive cotton strips, and the adjacent plate bodies are spliced by abutting the corresponding end surfaces and pressing the conductive cotton strips in the mounting steps.

2. The turntable and antenna tower box shielding structure of an electric wave anechoic chamber according to claim 1, wherein The shielding box comprises: The antenna tower shielding box (1) covering the driving mechanism and control device of the antenna tower outside, the antenna tower shielding box (1) comprising an antenna tower box top plate (11), an antenna tower box bottom plate (12), an antenna tower box front plate (13), an antenna tower box rear plate (14), an antenna tower box left side plate (15) and an antenna tower box right side plate (16) corresponding to the shielding top plate, the shielding bottom plate, the shielding front plate, the shielding rear plate, the shielding left side plate and the shielding right side plate respectively; And the rotating table shielding box (2) covering the driving mechanism and control device of the rotating table outside, the rotating table shielding box (2) comprising a rotating table box top plate (21), a rotating table box bottom plate (22), a rotating table box front plate (23), a rotating table box rear plate (24), a rotating table box left side plate (25) and a rotating table box right side plate corresponding to the shielding top plate, the shielding bottom plate, the shielding front plate, the shielding rear plate, the shielding left side plate and the shielding right side plate respectively.

3. The turntable and antenna tower box shielding structure of an electric wave anechoic chamber according to claim 2, wherein The mounting steps comprise: A front plate annular step (131) is arranged on the inner side wall of the antenna tower box front plate (13) facing the inside of the antenna tower shielding box (1) and connects the four end surfaces of the antenna tower box front plate (13) parallel to the thickness direction thereof; A rear plate annular step (141) is arranged on the inner side wall of the shielding rear plate facing the inside of the shielding box and connects the four end surfaces of the antenna tower box rear plate (14) parallel to the thickness direction thereof; A pair of left side plate strip steps (151) are respectively arranged on the inner side wall of the antenna tower box left side plate (15) facing the inside of the shielding box for connecting the upper and lower edges of the antenna tower box top plate (11) and the antenna tower box bottom plate (12); A pair of right side plate strip steps (161) are respectively arranged on the inner side wall of the antenna tower box right side plate (16) facing the inside of the shielding box for connecting the upper and lower edges of the antenna tower box top plate (11) and the antenna tower box bottom plate (12); A pair of front plate strip steps (231) are respectively arranged on the inner side wall of the rotating table box front plate (23) facing the inside of the shielding box for connecting the upper and lower edges of the rotating table box top plate (21) and the rotating table box bottom plate (22); A pair of rear plate strip steps (241) are respectively arranged on the inner side wall of the rotating table box rear plate (24) facing the inside of the shielding box for connecting the upper and lower edges of the rotating table box top plate (21) and the rotating table box bottom plate (22); A left side plate annular step (251) is arranged on the inner side wall of the left side plate (25) of the turntable box, which is connected to the four end faces of the left side plate (25) parallel to the thickness direction. A right side plate annular step is arranged on the inner side wall of the right side plate of the turntable box, which is connected to the four end faces of the right side plate parallel to the thickness direction.

4. Turntable and antenna tower box shielding structure for anechoic chamber according to any of claims 1-3, characterized in that, The shielding box body is made of an aluminum alloy plate with surface conductive oxidation treatment.

5. A turntable and antenna tower box shielding structure for an anechoic chamber according to any one of claims 1 to 3, characterized in that, The thickness of the shielding top plate and the shielding bottom plate is 8 mm, and the thickness of the shielding front plate, the shielding rear plate, the shielding left side plate and the shielding right side plate is 12-13 mm.

6. The turntable and antenna tower box shielding structure of an electric wave anechoic chamber according to claim 2, wherein A plurality of first support connecting holes (121) and antenna base connecting holes (122) are arranged on the antenna tower box bottom plate (12); A plurality of second support connecting holes (221) are arranged on the turntable box bottom plate (22); The turntable and antenna tower box body shielding structure of the electric wave darkroom further comprises: The antenna tower box motor rack (5) comprises: A first support bottom plate (51) is provided with a plurality of first bottom plate connecting holes (511); A first installation vertical plate (52) is vertically connected to one end of the first support bottom plate (51), and the first installation vertical plate (52) is provided with a first motor installation hole (521) for installing a motor; The turntable box motor rack (6) comprises: A second support bottom plate (61) is provided with a plurality of second bottom plate connecting holes (611); A second installation vertical plate (62) is vertically connected to one end of the second support bottom plate (61), and the second installation vertical plate (62) is provided with a second motor installation hole (621) for installing a motor; The antenna tower box motor rack (5) is installed in the antenna tower shielding box (1) by connecting the first bottom plate connecting hole (511) and the first support connecting hole (121) through a connecting piece; The turntable box motor rack (6) is installed in the turntable shielding box (2) by connecting the second bottom plate connecting hole (611) and the second support connecting hole (221) through a connecting piece.

7. The turntable and antenna tower box shielding structure of an electric wave anechoic chamber according to claim 2, wherein The antenna tower box rear plate (14) is provided with a first heat dissipation air inlet hole group (142), a first heat dissipation air outlet hole group (143), at least one air pipe connecting flange (144), at least one first optical fiber connecting flange (145) and a first power input end (146), and the first power input end (146) is provided with a filter; The turntable box rear plate (24) is provided with a second heat dissipation air outlet hole group (243), at least one second optical fiber connecting flange (244) and a second power input end (242), and the second power input end (242) is provided with a filter; The turntable box front plate (23) is provided with a second heat dissipation air inlet hole group (232).

8. The turntable and antenna tower box body shielding structure of the electric wave darkroom according to claim 7, wherein The antenna tower box back plate (14) is further provided with a first power supply grounding end, the first power supply grounding end is connected to the total grounding point of the anechoic chamber, and the grounding ends of the power supply of the driving mechanism and the control device of the antenna tower are respectively connected to the first power supply grounding end; The turntable back plate is further provided with a second power supply grounding end, the second power supply grounding end is connected to the total grounding point of the anechoic chamber, and the grounding ends of the power supply of the driving mechanism and the control device of the turntable are respectively connected to the second power supply grounding end.

9. The turntable and antenna tower box shielding structure of an electric wave anechoic chamber according to claim 2, wherein The antenna tower box left side plate (15) and the antenna tower box right side plate (16) are provided with at least one first output shaft through hole (7), both ends of the first output shaft through hole (7) are respectively provided with two layers of conductive wire mesh gaskets at the corresponding connection positions of the inner side wall and the outer side wall of the antenna tower box right side plate (16). The turntable box top plate (21) is provided with at least one second output shaft through hole (211), both ends of the second output shaft through hole (211) are respectively provided with two layers of conductive wire mesh gaskets at the corresponding connection positions of the inner side wall and the outer side wall of the turntable box top plate.

10. A turntable and antenna tower box shielding structure for an anechoic chamber according to any one of claims 1 to 3, characterized in that, The shielding top plate, the shielding bottom plate, the shielding front plate, the shielding back plate, the shielding left side plate and the shielding right side plate are provided with a plurality of connection hole positions (4) matched with countersunk screws at each end surface connected with adjacent plate bodies, six adjacent plate bodies are connected by countersunk screws passing through the corresponding connection hole positions (4) to form the shielding box body.

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