An electromagnetic shield

Abstract

The utility model belongs to the field of electromagnetic shielding, specifically is a kind of electromagnetic shielding device, including shielding device body, the shielding device body one side is fixedly connected with extension shell, the inner chamber slidingly connected with antenna of extension shell, the number of antenna is multiple, the inner chamber of extension shell is provided with transmission structure;Antenna can be stored along extension shell in the utility model, pass through the transmission effect of the connecting shaft in transmission structure, the side of each antenna is provided with a group of corresponding first gear, connecting shaft rotates simultaneously drives surface multiple first gear synchronous rotation, because the tooth of first gear and the tooth of rack interlock, first gear rotates simultaneously can drive multiple antenna synchronous adjustment to project length, so that different wavelength signals are adapted, solve the problem that the length of most conventional electromagnetic shielding device antenna is not adjusted conveniently.

Description

Technical Field

[0001] This utility model relates to the field of electromagnetic shielding, specifically an electromagnetic shielding device. Background Technology

[0002] An electromagnetic shield is a device used to suppress or block the propagation of electromagnetic waves. It utilizes the reflective properties of conductive materials such as metals to guide electromagnetic waves in a specific direction, reducing their entry into the protected area. It also uses special materials (such as ferrites and conductive coatings) to convert electromagnetic wave energy into heat or other forms of energy, reducing the intensity of electromagnetic waves. By designing shielding structures (such as Faraday cages), it guides electromagnetic waves to a specific path to prevent them from interfering with sensitive equipment.

[0003] The main functions of electromagnetic shielding antennas are to enhance the signal coverage of the shield, optimize the shielding effect, and improve the flexibility and adaptability of the equipment. However, most traditional electromagnetic shielding antennas are not easy to adjust in length. The antenna length needs to match the wavelength of the target electromagnetic wave (such as 1 / 4 wavelength or 1 / 2 wavelength) to radiate or receive signals efficiently. If the length is fixed, it can only be optimized for specific frequencies, and the performance will degrade at other frequencies. In addition, the modern electromagnetic environment is complex. If the shield needs to cover multiple frequency bands (such as Wi-Fi, Bluetooth, 4G / 5G), fixed-length antennas are difficult to meet the requirements. Utility Model Content

[0004] To overcome the shortcomings of existing technologies, most traditional electromagnetic shielding antennas are not easy to adjust in length. The antenna length needs to be matched with the wavelength of the target electromagnetic wave in order to radiate or receive signals efficiently. If the length is fixed, it can only be optimized for specific frequencies. This utility model proposes an electromagnetic shielding device.

[0005] The technical solution adopted by this utility model to solve its technical problem is: an electromagnetic shield, including a shield body, an extended outer shell fixedly connected to one side of the shield body, an antenna slidably connected to the inner cavity of the extended outer shell, the number of antennas being multiple, and a transmission structure being provided in the inner cavity of the extended outer shell.

[0006] The transmission structure includes a connecting shaft, one end of which is rotatably connected to the inner cavity of the extended housing. A first gear is fixedly connected to the surface of the connecting shaft, and there are multiple first gears. A rack is fixedly connected to the surface of each antenna, and the surface of the rack is slidably connected to the inner cavity of the extended housing. The teeth of the first gear and the teeth of the rack mesh with each other.

[0007] Preferably, a limiting plate is fixedly connected to the surface of the antenna, and the surface of the limiting plate is slidably connected to the inner cavity of the extended housing.

[0008] Preferably, one end of the antenna is fixedly connected to a positioning plate, and one side of the positioning plate abuts against the teeth of the first gear.

[0009] Preferably, the inner cavity of the extended outer shell is rotatably connected to a rotating shaft, one end of which is fixedly connected to a handle, and the other end of which is fixedly connected to a second gear.

[0010] Preferably, a third gear is fixedly connected to the surface of the connecting shaft, and the teeth of the third gear and the teeth of the second gear mesh with each other.

[0011] Preferably, a ratchet is fixedly connected to the surface of the rotating shaft, a pawl is rotatably connected to the inner wall of the extended housing, one end of the pawl meshes with the teeth of the ratchet, and a lever is fixedly connected to the surface of the pawl.

[0012] Preferably, the inner cavity of the extended outer shell is rotatably connected to an elastic plate, one end of which abuts against the surface of the pawl.

[0013] The advantages of this utility model are:

[0014] In this invention, the antenna can be stored along the extended outer shell. The connecting shaft in the transmission structure plays the main transmission role. Each antenna has a corresponding set of first gears on one side. When the connecting shaft rotates, it drives multiple first gears on the surface to rotate synchronously. Since the teeth of the first gears and the teeth of the rack mesh with each other, the rotation of the first gears can drive multiple antennas to adjust their protrusion length synchronously to adapt to different wavelength signals. This solves the problems of traditional electromagnetic shielding antennas being inconvenient to adjust in length, requiring the antenna length to match the wavelength of the target electromagnetic wave in order to efficiently radiate or receive signals, and being able to optimize only for specific frequencies if the length is fixed. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a first three-dimensional schematic diagram of the overall equipment of this utility model;

[0017] Figure 2 This is a second perspective view of the overall equipment of this utility model;

[0018] Figure 3 This is a schematic diagram of the internal structure of the extended outer shell of this utility model;

[0019] Figure 4 This is a schematic diagram of the ratchet and pawl structure of this utility model.

[0020] In the diagram: 1. Shielding body; 2. Extended outer shell; 3. Antenna; 4. Transmission structure; 401. Connecting shaft; 402. First gear; 403. Rack; 5. Limiting plate; 6. Positioning plate; 7. Rotating shaft; 8. Handle; 9. Second gear; 10. Third gear; 11. Ratchet; 12. Pad; 13. Paddle plate; 14. Elastic plate. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0022] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0023] This application discloses an electromagnetic shielding device. (Refer to...) Figures 1 to 3 An electromagnetic shielding device includes a shielding body 1, an extended outer shell 2 fixedly connected to one side of the shielding body 1, an antenna 3 slidably connected to the inner cavity of the extended outer shell 2, the number of antennas 3 being multiple, and a transmission structure 4 being provided in the inner cavity of the extended outer shell 2.

[0024] The transmission structure 4 includes a connecting shaft 401, one end of which is rotatably connected to the inner cavity of the extended housing 2. A first gear 402 is fixedly connected to the surface of the connecting shaft 401. There are multiple first gears 402. A rack 403 is fixedly connected to the surface of each antenna 3. The surface of the rack 403 is slidably connected to the inner cavity of the extended housing 2. The teeth of the first gear 402 and the teeth of the rack 403 mesh with each other. The electromagnetic shield, antenna 3 and extended housing 2 are all fixed to one side of the shield body 1, so that the antenna 3 of the electromagnetic shield does not need to be disassembled and can be stored along the extended housing 2. The connecting shaft 401 in the transmission structure 4 plays the main transmission role. Each antenna 3 has a corresponding set of first gears 402 on one side. When the connecting shaft 401 rotates, it drives multiple first gears 402 on the surface to rotate synchronously. Since the teeth of the first gear 402 and the teeth of the rack 403 mesh with each other, the rotation of the first gear 402 can drive multiple antennas 3 to synchronously adjust their protrusion length in order to adapt to different wavelength signals.

[0025] Reference Figure 3A limiting plate 5 is fixedly connected to the surface of the antenna 3. The surface of the limiting plate 5 is slidably connected to the inner cavity of the extended housing 2. Through the setting of the limiting plate 5, the position of the antenna 3 can be limited, ensuring that the transmission of the first gear 402 and the rack 403 realizes the vertical lifting and lowering of the antenna 3.

[0026] Reference Figure 3 One end of the antenna 3 is fixedly connected to a positioning plate 6. One side of the positioning plate 6 abuts against the teeth of the first gear 402. With the positioning plate 6, the antenna 3 can adjust its length while the positioning plate 6 moves synchronously with the antenna 3. When the positioning plate 6 abuts against the first gear 402, the rotation of the first gear 402 can be avoided as much as possible, thus limiting the highest position of the antenna 3.

[0027] Reference Figure 3 A rotating shaft 7 is rotatably connected to the inner cavity of the extended outer shell 2. A handle 8 is fixedly connected to one end of the rotating shaft 7, and a second gear 9 is fixedly connected to the other end of the rotating shaft 7. A third gear 10 is fixedly connected to the surface of the connecting shaft 401. The teeth of the third gear 10 and the teeth of the second gear 9 mesh with each other. Through the rotating shaft 7, the handle 8, the rotating shaft 7, and the second gear 9 are coaxially fixedly connected as one unit. The handle 8 can drive the rotating shaft 7 and the second gear 9 to rotate. Since the teeth of the second gear 9 and the teeth of the third gear 10 mesh with each other, the rotation of the second gear 9 drives the rotation of the third gear 10, which in turn drives the connecting shaft 401 to rotate, thereby realizing the adjustment of the length of the antenna 3.

[0028] Reference Figure 4 A ratchet 11 is fixedly connected to the surface of the rotating shaft 7, and a pawl 12 is rotatably connected to the inner wall of the extended housing 2. One end of the pawl 12 meshes with the teeth of the ratchet 11, and a lever 13 is fixedly connected to the surface of the pawl 12. With the ratchet 11 and pawl 12 in place, the handle 8 drives the rotating shaft 7 to rotate, and the ratchet 11 rotates synchronously. When the ratchet 11 attempts to rotate in the opposite direction, the other end of the pawl 12 will engage with the back of the teeth of the ratchet 11 to prevent reverse movement and avoid the second gear 9 from rotating in the opposite direction, which would affect the stability of the antenna 3. The lever 13 can be used to rotate and lift the ratchet 11 along the connection point, releasing the meshing between the ratchet 11 and the pawl 12, so that the second gear 9 can be reversed, so that the antenna 3 can be stored.

[0029] Reference Figure 4 An elastic plate 14 is rotatably connected to the inner cavity of the extended outer shell 2. One end of the elastic plate 14 abuts against the surface of the pawl 12. Through the elastic plate 14, the elastic plate 14 can abut against the pawl 12 to ensure the tightness of the engagement between the pawl 12 and the ratchet 11, and to avoid loosening between the pawl 12 and the ratchet 11, which could cause the second gear 9 to rotate unexpectedly. When the pawl 12 is lifted by the lever 13, the pawl 12 can also lift the elastic plate 14.

[0030] Working principle: Antenna 3 and extended housing 2 are both fixed to one side of shielding body 1, so that antenna 3 does not need to be disassembled and can be stored along extended housing 2. Handle 8, rotating shaft 7 and second gear 9 are coaxially fixedly connected as one unit. Handle 8 can drive rotating shaft 7 and second gear 9 to rotate. Since the teeth of second gear 9 and third gear 10 mesh with each other, the rotation of second gear 9 drives the rotation of third gear 10. Third gear 10 drives the connecting shaft 401 to rotate. Each antenna 3 has a corresponding first gear 402 on one side. The rotation of connecting shaft 401 drives multiple first gears 402 on the surface to rotate synchronously. Since the teeth of first gear 402 and rack 403 mesh with each other, the rotation of first gear 402 can drive the rack 403 to rotate simultaneously. Multiple antennas 3 are moved synchronously to adjust their protrusion length to adapt to different wavelength signals. While the handle 8 drives the rotating shaft 7 to rotate, the ratchet 11 rotates synchronously. When the ratchet 11 attempts to rotate in the opposite direction, the other end of the pawl 12 will engage with the back of the teeth of the ratchet 11 to prevent reverse movement and avoid the second gear 9 from rotating in the opposite direction, which would affect the stability of the antenna 3. The ratchet 11 can be rotated and lifted along the connection point by the lever 13 to disengage the ratchet 11 from the pawl 12, so that the second gear 9 can be reversed for the antenna 3 to be stored. The elastic plate 14 can abut against the pawl 12 to ensure the tightness of the engagement between the pawl 12 and the ratchet 11 and to avoid the pawl 12 from loosening and causing the second gear 9 to rotate unexpectedly. While the pawl 12 is lifted by the lever 13, the pawl 12 can also lift the elastic plate 14.

[0031] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. An electromagnetic shield, characterized in that: Includes a shield body (1), an extended outer shell (2) is fixedly connected to one side of the shield body (1), an antenna (3) is slidably connected to the inner cavity of the extended outer shell (2), the number of antennas (3) is multiple, and a transmission structure (4) is provided in the inner cavity of the extended outer shell (2). The transmission structure (4) includes a connecting shaft (401), one end of which is rotatably connected to the inner cavity of the extended housing (2). A first gear (402) is fixedly connected to the surface of the connecting shaft (401). There are multiple first gears (402). A rack (403) is fixedly connected to the surface of each antenna (3). The surface of the rack (403) is slidably connected to the inner cavity of the extended housing (2). The teeth of the first gear (402) and the teeth of the rack (403) mesh with each other.

2. An electromagnetic shielding device according to claim 1, characterized in that: The surface of the antenna (3) is fixedly connected to a limiting plate (5), and the surface of the limiting plate (5) is slidably connected to the inner cavity of the extended shell (2).

3. An electromagnetic shielding device according to claim 1, characterized in that: One end of the antenna (3) is fixedly connected to a positioning plate (6), and one side of the positioning plate (6) abuts against the teeth of the first gear (402).

4. An electromagnetic shielding device according to claim 1, characterized in that: The inner cavity of the extended outer shell (2) is rotatably connected to a rotating shaft (7), one end of which is fixedly connected to a handle (8), and the other end of which is fixedly connected to a second gear (9).

5. An electromagnetic shielding device according to claim 4, characterized in that: A third gear (10) is fixedly connected to the surface of the connecting shaft (401), and the teeth of the third gear (10) and the teeth of the second gear (9) mesh with each other.

6. An electromagnetic shielding device according to claim 4, characterized in that: A ratchet (11) is fixedly connected to the surface of the rotating shaft (7), and a pawl (12) is rotatably connected to the inner wall of the extended outer shell (2). One end of the pawl (12) meshes with the teeth of the ratchet (11), and a lever (13) is fixedly connected to the surface of the pawl (12).

7. An electromagnetic shielding device according to claim 6, characterized in that: The inner cavity of the extended outer shell (2) is rotatably connected to an elastic plate (14), one end of which abuts against the surface of the pawl (12).

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