493results about "Screening casings" patented technology

The terminal equipment comprises a shell, a circuit board, a heating device, an air duct, a heat dissipation piece and a fan device. The shell is provided with an air inlet hole and an air outlet hole. The circuit board is arranged in the shell, the heating device is arranged on the circuit board, the air duct is arranged between the shell and the circuit board, the air duct comprises an air inlet and an air outlet, the air inlet is communicated with the air inlet hole, and the air outlet is communicated with the air outlet hole. The heat dissipation piece is arranged in the air channel and close to the air outlet and used for receiving heat conducted by the heating device. The fan device is arranged at the position, close to the air inlet, in the air channel and used for guiding air flow to the heat dissipation piece so that heat of the heat dissipation piece can be dissipated to the outside of the shell through the air outlet and the air outlet holes in sequence through the air flow. According to the terminal equipment, the heat dissipation system comprising the heat dissipation piece, the fan device, the air duct and the like is arranged in the terminal equipment, active heat dissipation can be achieved, the purpose of efficiently cooling a heating device is achieved, and the terminal equipment can obtain good performance when running in a high-load scene.

An electronic device is provided, the electronic device includes a primary device assembly and an extension assembly. The primary device assembly includes a first housing and a primary body circuit, the first housing has a first accommodation cavity, and the primary body circuit is disposed in the first accommodation cavity. The extension assembly includes a second housing and an extension circuit. The second housing has a second accommodation cavity, the extension circuit is disposed in the second accommodation cavity, and the extension circuit is signal-connected to the primary body circuit, to extend or enhance functionality of the primary device assembly.

The invention discloses terminal equipment, which comprises a display structure, a shielding structure and an antenna, and is characterized in that a second part of the shielding structure is arranged on the periphery of the side surface of the display structure, and the second part is arranged between a radiator and the side surface of the antenna, so that signal isolation is realized, and the absorption loss of the display structure to the antenna is reduced. According to the application, the miniaturization and large screen-to-body ratio of the terminal equipment can be realized, and the performance of the antenna can be ensured.

The invention provides a magnetic shielding box for weak magnetic signal measurement and a shielding effectiveness estimation method. The magnetic shielding box comprises a non-magnetic supporting frame and a shielding mechanism. The non-magnetic supporting frame is a cuboid, is at least arranged along the edges of the cuboid and is used for supporting the shielding mechanism, and the interior of the non-magnetic supporting frame is hollow so as to accommodate an object to be detected; the shielding mechanism at least comprises N layers of plate layer structures, plate layer fixing pieces and plate layer supporting pieces; the plate layer structures are sequentially arranged outside the non-magnetic supporting frame in a sleeving mode so as to isolate an external magnetic field of the magnetic shielding box. The plate layer fixing piece sequentially penetrates through all the plate layer structures and is fixedly embedded into the non-magnetic supporting frame. The plate layer supporting pieces are at least arranged between the two adjacent plate layer structures and used for controlling the distance between the two adjacent plate layer structures. N is an integer greater than or equal to 2. The problem of complex manufacturing of the magnetic shielding box can be solved, and the shielding effects of different frequency bands are ensured.

The invention provides a magnetic shielding unit hanging positioning and precision adjusting tool and an installation method. The magnetic shielding unit positioning tool comprises a sleeving shell matched with the outer contour of a base and provided with an opening in the lower portion. A guide channel is formed in the middle of the sleeving shell; a guide structure expanding outwards is formed at the inlet end of the guide channel, and a positioning closing opening for clamping a hook of the magnetic shielding unit is formed at the tail part of the guide structure; the parts, on the two sides of the guide channel, of the sleeving shell are connected. The magnetic shielding unit hanging precision adjusting tool comprises a sleeving frame which is matched with the outer contour of a base and provided with an opening in the lower portion. Two threaded driving units are symmetrically arranged in the middle of the sleeving frame, the axes of the two threaded driving units are parallel, and the ends of the two threaded driving units are oppositely arranged. And an adjusting space for accommodating a hook of the magnetic shielding unit is formed between the two threaded driving units. According to the scheme, rapid hanging mounting is achieved through a horn mouth type guide structure of the positioning tool, and the precision is guaranteed through fine adjustment of double screws of the adjusting tool.

The invention discloses a high-performance electromagnetic shielding and heat dissipation device and an application method, and relates to the technical field of electromagnetic shielding and heat dissipation, and the method comprises the steps: dividing a shielding body into a main shielding cavity and a shielding heat dissipation cavity through a partition plate; the main shielding cavity is internally provided with a sub-cavity, and the main shielding cavity and the sub-cavity are sealed by a double-layer cover plate; an optical fiber outlet shielding body and a second radio frequency through-wall connector are arranged on the main shielding cavity in a penetrating manner, the optical fiber outlet shielding body is in signal connection with the sub-cavity through an optical fiber MPO jumper wire and an optical fiber in sequence, and the second radio frequency through-wall connector is in signal connection with the sub-cavity through the first radio frequency through-wall connector; and the sub-cavities are connected through feed-through capacitors. According to the invention, high-performance electromagnetic shielding is carried out by adopting various methods, the electromagnetic interference of the digital device on the radio telescope is reduced, and the acquisition and processing board card can be ensured to directly acquire the radio frequency signal output by the receiver, so that the fidelity of signal acquisition and transmission is improved, meanwhile, the digital device is cooled, and the stable work of the device is ensured.

An enclosure to protect people and instruments from the effects of an electromagnetic pulse (EMP) is provided. The enclosure includes a floor assembly; walls extending upward on a first, second, third, and fourth side of the floor assembly; a roof; and a ceiling. On the interior of the enclosure, a shield layer is provided such that the enclosure forms a six-sided Faraday cage. Fasteners and other conductive securement materials such as copper tape help achieve the conductivity of the shield layer. Extending through the walls of the enclosure may be secure points of entry allowing for people, air, and conductors to securely enter and exit the enclosure. The enclosure contains a grounding system to assist with protecting the contents of the enclosure from the effects of the EMP.

The present invention relates to the field of borehole radar, and in particular to a directional borehole radar shielding chamber and a method for using the same. The directional borehole radar shielding chamber comprises a main body, a resistor connection part, a radiation surface support part and a transmitter (receiver) installation part. The main body is a semi-cylindrical shell; the resistor connection part is located at the two ends of the main body, and is used to connect the impedance matching resistor; the radiation surface support part is an arc beam structure, on which an arc-shaped card slot is provided, which is used to support and fix the arc-shaped butterfly-shaped radiation surface; the transmitter (receiver) installation part is located in the middle of the main body, and is used to fix the transmitter (receiver). The shielding chamber is an integrated structure, made of a plastic material with a low density, and a layer of conductive metal paint is sprayed on its outer surface. The shielding chamber takes into account both the shielding function and the lightweight performance, and the overall mass distribution is more uniform. The rotational movement speed is more stable during horizontal detection, and the card slot type supporting structure not only ensures the radial support of the arc-shaped butterfly-shaped radiation surface, but also avoids its circumferential shaking.

The invention discloses a fireproof low-magnetism freight magnetic shielding door with a large magnetic shielding space. The fireproof low-magnetism freight magnetic shielding door comprises a door leaf; the door frame is mounted inside the portal frame; the locking mechanism assists in opening and closing the door leaf; wherein the door leaf is in butt joint with the door frame to form a magnetic shielding continuous structure; wherein the door leaf and the door frame are fixed and released through a locking mechanism; a sliding rail mechanism is arranged on the door leaf and matched with the door frame to achieve opening and closing. The door leaf and the door frame are each of a multi-layer composite structure which comprises a fireproof plate, a magnetic shielding layer and a copper layer, the multiple functions of fire prevention, magnetic shielding and electromagnetic shielding are achieved, and the overall performance and the space utilization rate are improved. And when the permalloy is prevented from being excessively pressed, the butt joint precision is improved, the magnetic leakage at the door slot is reduced, and the opening force is low while the high magnetic shielding effect is achieved.

The application relates to the technical field of high-voltage switch cabinets, in particular to a high-voltage switch cabinet convenient to maintain, which comprises a cabinet body and a cabinet door arranged on the cabinet body, a through hole extending along the arrangement direction of the cabinet door and the cabinet body is arranged on the cabinet door, an observation window, a shielding plate with mesh holes and a shielding net are arranged on the cabinet door, the mesh holes of the shielding plate and the shielding net are different in size, the observation window, the shielding net and the shielding plate are sequentially arranged along the arrangement direction of the cabinet door and the cabinet body, and the observation window, the shielding plate and the shielding net are all located on the surface of the cabinet door close to the cabinet body and cover the through hole. The shielding plate with mesh holes and the shielding net are arranged to form a multilayer electromagnetic shielding structure, the shielding plate and the shielding net can filter electromagnetic interference of different frequencies in a synergistic manner, and the electromagnetic compatibility is significantly improved.

The invention discloses an EMC filtering electromagnetic shielding structure which comprises a metal casing, a shielding wall integrally formed with the casing, a cover plate arranged on the casing, a filtering assembly and a main power assembly, the filtering assembly and the main power assembly are arranged in the casing, and a filtering cavity and a main power cavity which are separated by the shielding wall are arranged in the casing. The filtering assembly is arranged in the filtering cavity, the main power assembly is arranged in the main power cavity, and the shielding wall is in interference contact connection with the cover plate. The EMC filtering electromagnetic shielding structure has the advantages of being good in electromagnetic shielding effect and low in cost. The invention further provides a vehicle-mounted charger adopting the EMC filtering electromagnetic shielding structure.

The invention discloses a radiation shielding case for charging equipment of an automobile battery swap station, and belongs to the technical field of radiation shielding cases, the radiation shielding case comprises a bottom plate, the upper surface of the bottom plate is in bolted connection with a battery swap station, the upper surface of the bottom plate is in welded connection with a vertical plate, and the upper surface of the bottom plate is in bolted connection with a motor; the device further comprises a rotating shaft, the rotating shaft is rotationally arranged in the vertical plate, and the tail end of the rotating shaft is fixedly connected with a fan. According to the radiation shielding cover for the charging equipment of the automobile battery swap station, at the beginning, the long pin is located at the position close to the connecting shaft, an operator can conveniently and rapidly change the battery through the battery bin, after battery changing, the motor is started and drives the threaded rod to rotate, at the moment, the long pin moves in the vertical direction under the action of the long plate and the limiting column, and when the long pin descends, the long pin moves in the vertical direction. When the shielding case is unfolded, the shielding case body on the surface of the connecting shaft is pulled open, even if the shielding case body is unfolded, the long pin moves to the lower side of the vertical plate finally, the shielding case body is completely unfolded, and the anti-radiation purpose is achieved.

The embodiment of the invention provides an electromagnetic shielding cover, which is arranged on a first side surface of a base station module, is perpendicular to a top surface of the base station module, and extends out along a direction perpendicular to the top surface of the base station module. The height of the electromagnetic shielding cover is higher than the thickness of the base station module by a first height, energy radiated by the base station module comprises energy of a front-view upper side lobe, and the electromagnetic shielding cover is used for shielding the energy of the front-view upper side lobe. According to the embodiment, the electromagnetic shielding cover is arranged on the first side face of the base station module, is perpendicular to the top face of the base station module and extends out in the direction perpendicular to the top face of the base station module, and due to the fact that the electromagnetic shielding cover is higher than the base station module, energy of a front-view side lobe of the base station module can be shielded.

A power supply instrument with a protection structure disclosed by the present invention comprises a power supply instrument body, a protection mechanism is installed on the outer side of the power supply instrument body, the protection mechanism comprises a protection shell, a heat dissipation assembly is installed in the protection shell, a dustproof assembly is installed on the protection shell on the outer side of the heat dissipation assembly, and clamping assemblies are installed on the left side and the right side in the protection shell. The power supply instrument body is arranged between the clamping assemblies on the left side and the right side, the protective shell is provided with supporting sliding assemblies on the two sides of the bottom of the power supply instrument body, the protective shell is provided with a moisture-proof box on the top of the power supply instrument body, a plurality of through holes are formed in the two sides of the moisture-proof box, the moisture-proof box is filled with moisture-proof agents, and assembling frames are installed on the two sides of the protective shell. A cover plate is slidably mounted between the two side assembly frames, and a transparent plate is mounted on the cover plate at a position corresponding to the power supply instrument body.

The invention discloses a high-frequency water hammer pressure wave monitor suitable for fracturing, and relates to the technical field of water hammer pressure monitoring, the high-frequency water hammer pressure wave monitor comprises a shell, and the inner wall of the shell is sequentially provided with a buffer pad, a communication power supply module, a data acquisition and processing module, a signal adjusting and filtering module and a pressure detection module from top to bottom; a filter screen is fixedly connected to the lower side of the inner wall of the shell, and a vibration sensing module and a temperature collecting module are arranged between the pressure detection module and the signal adjusting and filtering module. By arranging the pressure detection module, the signal adjusting and filtering module, the data acquisition and processing module, the communication power supply module, the buffer pad, the vibration sensing module and the temperature acquisition module, a complete pressure acquisition, signal conditioning, data processing and transmission system is constructed, and the system has anti-seismic compensation and temperature correction functions; the system improves the monitoring precision and the system stability, is high in practicality, and is suitable for the real-time monitoring demands under the working condition of high-frequency water attack.

The invention relates to a motor controller, and belongs to the field of electric vehicle manufacturing. Comprising a motor control device which comprises a capacitor, a high-voltage input connector and a shielding magnetic ring; a containing cavity is formed in the motor controller shell, and the capacitor is installed in the containing cavity; the top of the installation box is communicated with the containing cavity, an installation opening is formed in the bottom of the installation box, the high-voltage input connector is connected to the bottom of the installation box, the shielding magnetic ring is installed in the installation box, and the shielding magnetic ring and the high-voltage input connector are connected through the installation opening. Under the condition that the capacity of the motor controller shell is limited, the layout and the installation mode of each component are optimized, the space is expanded from the bottom of the motor controller shell, and the shielding magnetic ring is installed, so that the size of the motor controller shell is reduced, and the assembly space utilization rate in an electric automobile is improved.

The invention relates to a spliced high-temperature superconducting magnetic shielding device and a combined device, which are used for at least solving the problem that a magnetic shielding device made of a soft magnetic material generates magnetic noise, and residual magnetism or magnetic noise can be reduced by at least 1-3 orders of magnitude after the spliced high-temperature superconducting magnetic shielding device and the combined device are combined with the spliced high-temperature superconducting magnetic shielding device. Comprising a spliced magnetic shielding barrel formed by splicing and enclosing a plurality of blocks, the blocks are superconductive blocks formed by sintering high-temperature superconductive powder, the splicing seams between the adjacent blocks are filled with the superconductive powder, the splicing seams between the adjacent blocks are adhered and sealed by superconductive tapes, and high-temperature superconduction means that the temperature of liquid nitrogen generating a superconductive phenomenon is greater than or equal to 77K.

The invention provides an electromagnetic shielding composite material, a preparation method thereof and an electromagnetic shielding shell structure, and belongs to the technical field of electromagnetic shielding. The electromagnetic shielding composite material is prepared from the following raw materials in percentage by mass: 70 to 85 percent of polymer matrix, 14.8 to 29 percent of modified filler, 0.1 to 0.5 percent of antioxidant and 0.1 to 0.5 percent of lubricant, mixing the graphene composite powder with MXene nanosheets, adding a silane coupling agent and absolute ethyl alcohol, and sequentially performing ultrasonic treatment, drying and sieving with a 100-200-mesh sieve to obtain a modified filler; wherein based on the mass of the graphene composite powder, the MXene nanosheet and the silane coupling agent, the mass percent of the graphene composite powder is 70 to 85 percent, the mass percent of the MXene nanosheet is 14 to 25 percent, and the mass percent of the silane coupling agent is 1 to 5 percent. The electromagnetic shielding composite material provided by the invention has more balanced electromagnetic shielding performance and mechanical performance.

The invention discloses an electromagnetic shielding case formed based on ultrafast laser plasma, and the electromagnetic shielding case comprises an ultrafast laser which is used for emitting ultrafast laser; the phase modulation element is used for carrying out annular modulation on the phase of the ultrafast laser to enable the cross section of a light beam to be in an annular shape; and the focusing device is used for pre-focusing the annular modulation light emitted by the phase modulation element in air to form a hollow cylindrical plasma cylinder, and the plasma cylinder is used for being nested at the periphery of equipment to be shielded so as to realize a signal shielding effect. Therefore, the generation and dissipation process of the ultrafast laser plasma is very rapid and can be completed on the nanosecond-level time scale, rapid response to electromagnetic waves can be achieved, and the method is suitable for occasions where the shielding effect needs to be dynamically adjusted.

The invention discloses a small-size high-power power supply design method and application based on a planar transformer, and the method comprises the following steps: S1, employing a planar transformer structure comprising at least two layers of PCB windings and a low-loss ferrite magnetic core, enabling the windings to be formed through the etching of PCB copper foils, and enabling the leakage inductance of the adjacent winding layers to be reduced in a staggered stacking manner; s2, the planar transformer is integrated into an LLC resonant half-bridge topology circuit, and soft switching operation of a power supply system under high frequency is achieved by adjusting the primary and secondary turn ratio and resonance parameters of the planar transformer. PCB copper foil etching windings and low-loss ferrite magnetic cores are adopted, leakage inductance is reduced by stacking winding layers in a staggered mode, and the reliability of the power supply system is improved; the planar transformer is combined with laser cutting to precisely control an air gap, so that primary and secondary coupling coefficients are improved to a high coupling state, energy loss is reduced, the size of the transformer is effectively reduced, the planar transformer can be popularized to the fields of industrial power supplies, energy storage systems and the like, and balance of small size and high power is achieved through collaborative optimization of the planar transformer and a topological structure.

The invention discloses an electromagnetic shielding intelligent cabinet with medical drug information monitoring identification, which comprises an electromagnetic shielding metal cabinet body, the front side of the electromagnetic shielding metal cabinet body is hinged with a left cabinet door and a right cabinet door through hinges, and a face identification intelligent electronic lock is arranged between the left cabinet door and the right cabinet door. A medical drug information monitoring and identifying assembly is mounted in the electromagnetic shielding metal cabinet body; the medical drug information monitoring and identifying assembly comprises two mounting cylinders which are fixedly connected to the inner wall of the top and the inner wall of the bottom of the electromagnetic shielding metal cabinet body respectively, a rotating shaft is rotationally connected between the two mounting cylinders, and the shaft wall of the rotating shaft is connected with a plurality of placing frames. According to the invention, the RFID scanning read-write instrument can fully cover the medicines at all positions, so that the RFID scanning read-write instrument can monitor and identify the information of all medicines in the intelligent cabinet, part of medicines can be prevented from being missed in reading, and the accuracy of monitoring and identifying the medicine information by the electromagnetic shielding intelligent cabinet is effectively improved.

Provided is a clamshell housing for a human-machine interface comprising a plastic “C” cover assembly and a plastic “D” cover assembly, the plastic “C” cover assembly comprising a plastic keyboard cover or palm rest, having a plurality of snap fittings thereon for attachment to a plastic “D” cover assembly, a keyboard having a keyboard connector electrically connecting the keyboard to a printed circuit board (PCB), a trackpad having a trackpad connector electrically connecting the trackpad to the printed circuit board (PCB). The housing of the invention may be easily disassembled for repair or recycling.

The invention provides a cup outlet mechanism with an EMC protection function and a beverage device, a horizontally arranged cup outlet tray is arranged at the top of a cup body conveying assembly, the cup outlet tray can bear cup bodies and achieve reciprocating motion in the vertical direction, a lifting door assembly is provided with a vertically arranged lifting door, and the lifting door can achieve reciprocating motion in the vertical direction; the transverse sliding door assembly is provided with a transverse sliding door which is vertically arranged, the transverse sliding door can move in a reciprocating mode in the horizontal or vertical direction, and the transverse sliding door is made of electromagnetic shielding materials. When the cup outlet tray bears a cup body and vertically moves to a cup taking position, the transverse sliding door horizontally or vertically moves to a blocking position, an electromagnetic shielding space is formed in the circumferential direction of the cup outlet tray and the cup body, the lifting door vertically moves to an open position, a user can take the beverage cup body from a cup taking opening, and after the cup body in the cup outlet tray is moved out, the lifting door vertically moves to a closed position. The cup taking opening is closed, the transverse sliding door horizontally or vertically moves to the through position, and the cup outlet tray vertically returns to the preloading position.

To provide a method for molding a metal-resin composite material that can suppress springback.SOLUTION: In a method for molding a metal-resin composite material that has a laminated structure in which metal layers and resin layers are alternately laminated, and the laminated structure is asymmetrical, the metal-resin composite material is divided into parts (a) and (b) at half of whole layer thickness, and a total layer thickness of the resin layer in part (a) is Tra, the total layer thickness of the metal layer in part (a) is Tma, the total layer thickness of the resin layer in part (b) is Trb, and the total layer thickness of the metal layer in part (b) is Tmb. If Tma / Tra>Tmb / Trb, molding is performed with the part (a) side placed on a surface to which pressing force is applied. If Tma / Tra<Tmb / Trb, molding is performed by placing the part (b) side on the surface to which pressing force is applied. If Tma / Tra=Tmb / Trb, molding is performed by arranging the side on which the metal layer is located on the surface layer or the side close to the metal layer in the surface layer of the part (a) or (b) on the surface to which pressing force is applied.SELECTED DRAWING: None

The invention relates to the technical field of electric power engineering data monitoring, and discloses an electric power engineering field data monitoring device which comprises a distribution box, a base is fixedly connected to the lower surface of the distribution box, a distribution box door is rotatably connected to the front face of the distribution box, and a display panel is fixedly connected to the front face of the distribution box door. A smoke detector is fixedly connected to the top of the distribution box, a lifting device is arranged on the upper surface of the distribution box, an electromagnetic shielding device is arranged on the upper surface of the base, and a moving device is arranged in the base. According to the device, the smoke detector can be cleaned through the falling of the camera, the moving wheels can be lifted up and put down at any time, and meanwhile, the device is more stable through the supporting plate.

The invention relates to the technical field of ultrasonic transducers, in particular to an ultrasonic transducer signal anti-interference transmission method and device, and the device comprises a signal preprocessing unit, an anti-interference unit, an isolation driving unit and a receiving demodulation and decoding unit. The signal preprocessing unit receives the original electric signal and performs differential amplification to generate a differential signal; the anti-interference unit collects the working environment temperature in real time through the temperature monitoring module, the coding strategy selection module and the modulation parameter control module dynamically select and optimize coding rules and adjust modulation parameters according to the working environment temperature, and the signal processing module converts differential signals into digital signals and completes coding modulation. The isolation driving unit performs signal isolation and power amplification; the receiving demodulation and decoding unit demodulates and decodes according to a corresponding rule and restores the ultrasonic signal; according to the invention, the coding rule, the modulation parameter and the heat dissipation strategy are dynamically adapted through temperature monitoring, the high-temperature performance drift of the anti-interference unit is inhibited, and reliable transmission of signals of the ultrasonic transducer is ensured.

The invention discloses a self-adaptive electromagnetic shielding touch display module, and belongs to the technical field of display modules, the self-adaptive electromagnetic shielding touch display module comprises a touch assembly and a liquid crystal display assembly, a copper foil is arranged between the top of the side edge of the liquid crystal display assembly and the top of the touch assembly, and the top of the copper foil is covered with a pressing plate; the pressing plate is fixed between the top of the touch control assembly and the top of the liquid crystal display assembly, an annular through groove is formed in the middle of the top of the pressing plate, a fixing ring is fixed to the top end of the pressing plate, and the annular through groove is located in the fixing ring. The outer side edges of the touch control assembly and the liquid crystal display assembly are covered with the copper foil, the outer shielding layer is locally formed, then the first metal grid and the second metal grid are arranged in the middle of the outer shielding layer, and then the rotating mechanism is used for controlling rotation of the first metal grid, so that the heat dissipation effect of the device can be ensured, and meanwhile the heat dissipation efficiency is improved. And the combination of the shielding layers is dynamically adjusted, so that the grid included angles are changed, the attenuation capability to electromagnetic waves with different frequencies is changed, the anti-interference effect is improved, and the practicability is higher.

The invention relates to the technical field of 5G communication modules, in particular to a compact integrated 5G communication module structure and an assembling method thereof.The compact integrated 5G communication module structure comprises a shielding shell, a sealing upper cover is installed at the upper end of the shielding shell, positioning units are installed at the four corners of the inner side of the shielding shell, and PCB stacking daughter boards and positioning middle frames are installed on the outer sides of the positioning units; the sealing upper cover comprises a plate body, the lower end of the plate body is fixedly connected with a buckle and a positioning ring plate, control grooves are formed in the four corners of the lower end of the plate body, and penetrating holes are formed in the four corners of the plate body. The positioning unit comprises a positioning column, vertical grooves are formed in the two sides of the positioning column, a plurality of fixing mechanisms are installed on the inner sides of the vertical grooves, the inner side of the positioning column is rotationally connected with a driving shaft through a circular plate, and edge grooves are formed in the two sides of the driving shaft. And the problems of contact resistance drift, signal integrity deterioration and creep failure after thermal circulation caused by insufficient pre-tightening of the middle layer are avoided.

A computing device includes: a housing having a plurality of outer walls; a first wireless communications assembly supported within the housing and including a first antenna; a wired communications assembly supported within the housing and including a port on one of the outer walls, the port configured to connect with another device; and a second wireless communications assembly supported within the housing and including a second antenna affixed to an electromagnetic shield disposed adjacent to the port of the wired communications assembly, the electromagnetic shield configured to shield the first antenna from electromagnetic noise generated by the wired communications assembly.