38results about How to "Maintain electromagnetic shielding" patented technology

The invention discloses a satellite-borne high-power power conditioning unit platform of an extensible structure. The satellite-borne high-power power conditioning unit platform of the extensible structure comprises a plurality of function modules, remote control and remote measurement flex-rigid printed boards, main error amplifier EMA modules, complete machine bus bars, an upper cover plate, a rear cover plate and side cover plates, wherein the function modules comprises the charge-discharge conditioning modules, the shunt conditioning modules and the remote control and remote measurement modules, the number of the charge-discharge conditioning modules and the number of the shunt conditioning modules are determined according to a power design objective, the main body of each function module is of a wholly-hollowed-out pentahedron structure, the side cover plates are installed after all the function modules are vertically arranged in a stacked mode, every two adjacent function modules are connected with each other through a protruding lug, each remote control and remote measurement flex-rigid printed board is installed in a cavity in the top of the corresponding function module, each error EMA module and each complete machine bus bar are installed in two cavities in the back side of the corresponding function module respectively, and the overall arrangement of the interior of each function module is layered and three-dimensional. The satellite-borne high-power power conditioning unit platform of the extensible structure can meet the environmental testing requirement of satellite-borne electronic equipment and can also meet the heat radiating requirement of a complete machine.

The invention provides an electromagnetic shielding protection film and an FPC (flexible printed circuit). The electromagnetic shielding protection film is simple in structure, relatively thin in thickness, excellent in electromagnetic shielding performance, particularly suitable for covering the bending region of the FPC, and capable of ensuring the electromagnetic shielding effect, the relatively thin thickness and a relatively good bending performance of the bending region. According to the FPC, the bending region is covered with the electromagnetic shielding protection film to replace the conventional electromagnetic shielding composite film with a relatively high thickness, so that the electromagnetic shielding effect, the relatively thin thickness and a relatively good bending performance of the bending region can be ensured; and when the FPC provided by the invention is adopted for connecting a display module and a mobile phone main board, the assembling difficulty of the display module and the mobile phone main board can be greatly lowered.

A wide-spectrum electromagnetic shielding light window comprises a host material, a first metal mesh and a second metal mesh, and is characterized in that the first metal mesh and the second metal mesh are metal meshes with periodic structures, and are inlaid in the host material of the light window. The wide-spectrum electromagnetic shielding light window has the advantages that high-frequency electromagnetic waves and low-frequency electromagnetic waves are simultaneously shielded, wide-spectrum electromagnetic shielding is realized, the electromagnetic shielding efficiency is high, and the light window is wear-resistant and heat-resistant. Moreover, the wide-spectrum electromagnetic shielding light window is applicable to wide-spectrum electromagnetic shielding in the fields of remote sensing and telemetry, medical diagnosis, secure communication and space flight and aviation.

The invention provides a coupling method for a vibrating table and a shielding box body. The coupling method comprises the following steps: 1) forming a hole in the connection part of the shielding box body and the vibrating table according to the size of a moving coil of the vibrating table, and setting a predetermined allowance at the hole for allowing the moving coil of the vibrating table to shake in the radial direction; 2) adding a tool on the moving coil of the vibrating table, dividing the tool into an upper half part and a lower half part, arranging the upper half part in the shielding box body for fixing a test article, and fixing the lower half part on the moving coil of the vibrating table and out of the shielding box body; 3) arranging a conductive rubber film between the upper half part and the lower half part to play a shielding role, and connecting the upper half part with the lower half part by virtue of bolts. By adopting the scheme, the requirement that the moving coil of the vibrating table vibrates and shakes in the axial direction can be met while the shielding performance of the shielding box body is ensured, and the experiment and test of product performance under the coupling effect of an electric magnetic field and vibratory stress can be possible.

A wide-spectrum electromagnetic shielding light window comprises a host material, a first metal mesh and a second metal mesh, and is characterized in that the first metal mesh and the second metal mesh are metal meshes with periodic structures, and are inlaid in the host material of the light window. The wide-spectrum electromagnetic shielding light window has the advantages that high-frequency electromagnetic waves and low-frequency electromagnetic waves are simultaneously shielded, wide-spectrum electromagnetic shielding is realized, the electromagnetic shielding efficiency is high, and the light window is wear-resistant and heat-resistant. Moreover, the wide-spectrum electromagnetic shielding light window is applicable to wide-spectrum electromagnetic shielding in the fields of remote sensing and telemetry, medical diagnosis, secure communication and space flight and aviation.

A detachable electromagnetic shielding shelter equipment cabinet access door comprises a door frame, a door plank, a handle, two locking devices, two fixing pins, a fixing pin installation plate and a shielding rubber strip. The fixing pin installation plate is arranged at the lower portion of the door plank and provided with the two fixing pins. The handle for carrying the access door is arranged on the outer wall of the door plank. The upper end of the door plank and the door frame are locked through the two locking devices. The shielding rubber strip is embedded into a sectional bar notch of the door frame. The detachable electromagnetic shielding shelter equipment cabinet access door is convenient to detach, good in electromagnetic shielding performance, light and high in strength.

The invention discloses an intelligent remote transmission device and a remote transmission instrument. The intelligent remote transmission device comprises a metal shell with an accommodating cavity and an opening in communication with the accommodating cavity, a first PCB arranged in the accommodating cavity, and a second PCB provided with both an antenna for the transmission of communication signals and a transparent portion. Through the transparent portion, the interior of the accommodating cavity can be viewed. The second PCB board is electrically connected with the first PCB and is in communication connection with the first PCB. The second PCB is also provided with a metal layer for shielding electromagnetic signals. According to the technical scheme of the invention, the interference of the static electricity, the direct current, low-frequency signals and microwave high-frequency signals on a communication frequency-band circuit inside the intelligent remote transmission device can be effectively prevented.

The invention provides a turntable device with a heavy-current output used for an anechoic chamber. The turntable device comprises an upper-layer turntable and a lower-layer turntable which are fixedly connected with each other, wherein a heavy-current generating device is arranged on the lower-layer turntable; the heavy-current generating device comprises three transformers with multiple magnetic circuits, three voltage regulators and a control cabinet; the control cabinet is connected to the three voltage regulators; and the three voltage regulators are connected to the corresponding transformers with multiple magnetic circuits. Compared with the prior art, the turntable device provided by the invention has the advantages that: 1) since a double-layer turntable structure with heavy-current output is adopted, electromagnetic compatible emission measurement can be performed on a high-voltage electric device and the problems which cannot be solved by an ordinary turntable can be solved; 2) a power feeding line is connected to the heavy-current generating device through a filter, thereby ensuring an electromagnetic shielding property of a measured device, promoting the measuring accuracy and preventing a power grid from being interfered by a harmonic wave generated by the voltage regulators; and 3) the measured device and the heavy-current generating device are connected through three lifting copper bars, so that the connection in a test process is convenient.

The invention provides a manufacturing method of an electromagnetic shielding sheet. The manufacturing method comprises the steps of providing at least one magnetic strip layer, forming a first glue layer on an upper surface of the magnetic strip layer and a second glue layer on a lower surface of the magnetic strip layer to form a magnetic lamination structure; smashing the magnetic lamination structure so that the magnetic strip layer is cracked to form a plurality of smashed pieces, wherein a smashed gap is formed between adjacent smashed pieces; and performing lamination on the smashed magnetic lamination structure so that at least one part of the smashed gap is partially filled with the first glue layer arranged on the upper surface and the second glue layer arranged on the lower surface. By the manufacturing method, the problem that the thickness of an existing electromagnetic shielding sheet is not applicable to small-size electronic equipment is solved.

The invention relates to an elastic electromagnetic shielding film and a preparation method thereof. The preparation method includes the following steps: S1: Mix the mixed solution obtained by mixing the magnetic metal salt solution, the complexing agent and the nucleating agent with the hydrazine hydrate solution, perform a hydrothermal reaction at 40-80°C for 15-120 minutes, and wash with water to obtain a magnetic Metal nanochains; S2: Mix magnetic metal nanochains, conductive additives, and sodium alginate, and dissolve to obtain an electromagnetic shielding function coating solution; S3: Surface pretreatment and prestretching of stretchable film base materials, and then coating Cloth the electromagnetic shielding function coating solution; S4: dip the base material obtained in S3 into a sodium chloride solution to cross-link, dry, and remove the pre-stretching to obtain the elastic electromagnetic shielding film. The elastic electromagnetic shielding film prepared by the invention has high electromagnetic shielding function, good flexibility, light and thin, durable, stretchable and stable. The preparation method provided by the invention has simple process and good stability, and is applicable to different application scenarios.

The invention relates to a transmission shaft shielded wall-passing apparatus comprises a box body, spherical electric wave absorbers inside the box body, a wall-passing rotating shaft, an output shaft coupling, an input shaft coupling, and a box body fixing rack. The wall-passing rotating shaft is installed on the sidewall of the box body via a self-aligning bearing. One end of the wall-passing rotating shaft is connected with the main shaft of a motor speed reducer installed outside a shielded room via the input shaft coupling. The other end of the rotating shaft is connected with the main shaft of a rotating table installed inside the shielded room via the output shaft coupling. The transmission shaft shielded wall-passing apparatus has advantages of maintaining high-efficient electromagnetic shielding performance of a shield and achieving torque transmission.

The invention provides a manufacturing method of an electromagnetic shielding sheet. The manufacturing method comprises the steps of providing at least one magnetic strip layer, forming a first glue layer on an upper surface of the magnetic strip layer and a second glue layer on a lower surface of the magnetic strip layer to form a magnetic lamination structure; smashing the magnetic lamination structure so that the magnetic strip layer is cracked to form a plurality of smashed pieces, wherein a smashed gap is formed between adjacent smashed pieces; and performing lamination on the smashed magnetic lamination structure so that at least one part of the smashed gap is partially filled with the first glue layer arranged on the upper surface and the second glue layer arranged on the lower surface. By the manufacturing method, the problem that the thickness of an existing electromagnetic shielding sheet is not applicable to small-size electronic equipment is solved.

The invention discloses a dust-proof device, which comprises a chassis panel, on which a heat dissipation hole of the chassis is arranged for heat dissipation of the chassis; The overturning of the overturning component seals or opens the opening of the heat dissipation hole; and the dustproof part is arranged in the overturning component. The beneficial effects of the present invention are as follows: one is to adopt the structure that a rotary spring is arranged between the rotating shaft and the dust-proof mesh, which is convenient for opening and closing, and is convenient for maintenance. It is made of metal, which can ensure the electromagnetic compatibility performance of the chassis; the third is to properly set up cooling holes, which can not only ensure the heat dissipation requirements, but also ensure the electromagnetic shielding performance of the chassis.

The invention discloses an intelligent remote transmission device and a remote transmission instrument. The intelligent remote transmission device comprises a metal shell with an accommodating cavity and an opening in communication with the accommodating cavity, a first PCB arranged in the accommodating cavity, and a second PCB provided with both an antenna for the transmission of communication signals and a transparent portion. Through the transparent portion, the interior of the accommodating cavity can be viewed. The second PCB board is electrically connected with the first PCB and is in communication connection with the first PCB. The second PCB is also provided with a metal layer for shielding electromagnetic signals. According to the technical scheme of the invention, the interference of the static electricity, the direct current, low-frequency signals and microwave high-frequency signals on a communication frequency-band circuit inside the intelligent remote transmission device can be effectively prevented.

The invention relates to a locking mechanism of an electronic device equipment case cover plate and a using method thereof. The locking mechanism of the cover plate is provided with a lock tongue assembly, a guide pin, a steel wire drive assembly and a locking assembly, wherein the lock tongue assembly and the guide pin correspond to a locking throat and a rebounder on the sidewall of an case bodyrespectively. Various lock tongues are connected in series to the U-shaped block of a locking block by a master steel wire, a transmission steel wire and a branch steel wire. A safety lock controls aslide block, and moves the slide block to drive the locking pin of a linkage into and out of the locking hole of the U-shaped block. When the cover plate is installed, the guide pin is aligned with the rebounder, the cover plate is pressed, and the lock tongues are inserted into the lock throat to be locked. When the cover plate is uninstalled, the safety lock is unlocked, the slide block is moved, the locking block is unlocked, a handle is rotated upward to be horizontal and then is pull outwards, the locking block is moved outwards, the mater steel wire, the transmission steel wire, and thebranch steel wire are pulled to synchronously drive the lock tongues connected in series to exit the lock throat, the rebounder opens the top plate, and the cover plate is removed. The locking mechanism does not need any tool, can quickly install and uninstall the cover plate of the equipment case, has good electromagnetic shielding performance, and also has a safety lock.

The invention discloses a terminal device and its heat dissipation structure, which belongs to the field of electronic technology. The heat dissipation structure includes a substrate, a heating element, a heat conductor, and a casing stacked sequentially from bottom to top, and a shielding frame arranged between the substrate and the casing , the base plate, the shielding frame and the shell enclose to form an accommodating space, the heating element and the heat conductor are accommodated in the accommodating space, the heat conductor at least includes a first heat conduction layer, and the first heat conduction layer is made of a heat conduction phase change material. Therefore, by filling the heat conductor with the first heat conduction layer made of heat-conducting phase-change material between the shell and the heating element, the heat conductor can dynamically adapt to the gap between the heat-generating element and the shell when the terminal is running . On the one hand, when the terminal is in working state, there is no gap between the shell and the shielding frame, which ensures the electromagnetic shielding performance; improved thermal performance.

The invention provides a circuit board structure and electronic equipment. The circuit board structure comprises two circuit boards which are opposite to each other and are separated from each other,wherein the circuit boards are respectively used for bearing elements. At least one of the two circuit boards comprises an insulating layer, a conductive layer, and a shielding layer. In each circuitboard the conductive layer is opposite to the other circuit board, and is separated from the other circuit board, and the conductive layer is electrically connected with the other circuit board and isprovided with an element. In a direction far from the other circuit board, the conductive layer, the insulating layer and the shielding layer are sequentially overlapped. The shielding layer is usedfor the electromagnetic shielding of the element between the two circuit boards. According to the embodiment of the invention, the circuit board structure can achieve the increasing of the bearing area under the condition that the electromagnetic shielding performance of the circuit board structure is guaranteed, and is enabled to bear more elements.

The invention relates to a device and method for installing and adjusting a low-stress conductive seal of an aviation light window. By using instruments and equipment such as an altimeter, a precision electric control adjustment table, and a self-collimating light tube, the light window is installed and adjusted with a reference tool, a light window, etc. Support tooling and other special process equipment and composite adhesive layer can quickly establish the installation and adjustment benchmark of the aviation light window, improve the installation accuracy, reduce the clamping stress and bonding stress, avoid the installation and adjustment stress, and ensure the sealing performance of the aviation light window. The optical performance is guaranteed while the electromagnetic shielding performance is achieved, which greatly improves the installation and adjustment efficiency and quality of aviation light windows.