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.

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 discloses a method for preparing an electromagnetic shielding material, which comprises the following steps: 1) preparing the following components in parts by weight: 70-80 parts by weight of silicon rubber; 20-30 parts by polytetrafluoroethylene; 2-3 parts by weight of nano-scale graphite powder; Curing agent ~ 2; heat stabilizer 1 ~ 2; 2) forming a composite rubber mixture uniformly infiltrated with nano-scale graphite particles in a molten state; 3) injecting the composite rubber mixture in step 2) into the mold cavity of the forming mold, and Completely wrap the wire mesh inside; 4) In a negative pressure environment, vibrate the forming mold through a vibrator to remove the internal air bubbles; 5) High pressure and low temperature, rapid cooling and solidification, to obtain a semi-finished electromagnetic shielding material; 6 ) heat and melt the semi-finished electromagnetic shielding material again, and cool and solidify naturally at high pressure and normal temperature to obtain the electromagnetic shielding material. The invention also discloses the electromagnetic shielding material prepared by the method, the corresponding electromagnetic shielding gasket, and the electromagnetic shielding button terminal using the electromagnetic shielding gasket.

The invention discloses a lightweight porous MXene-based composite film electromagnetic shielding material and a preparation method thereof, and belongs to the technical field of film electromagnetic shielding materials and preparation thereof. Self-assembly of MXene and graphene oxide is realized by taking electrostatic interaction force as driving force on MXene modified by a cationic surface modifier and graphene oxide, and then the lightweight porous MXene-based composite electromagnetic shielding material with ultrahigh specific performance is obtained through film casting and high-temperature annealing. The prepared composite film material has excellent electromagnetic shielding effectiveness and specific effectiveness, and when the thickness is only 15 [mu]m, the porous MXene-based composite film obtained by adding 5 wt% of graphene oxide can keep the electromagnetic shielding effectiveness of 49 dB or above in the whole X wave band. The preparation process is simple and easy to operate, and the material is expected to be applied to the fields of aerospace, military equipment, micro electronic equipment, civil electric appliances and the like.

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 provides an optical module. The optical module comprises a base, a support assembly, a shielding assembly, an optical device and an optical fiber adapter, the optical device is connectedwith the optical fiber adapter, the support assembly is made of a non-metallic material and comprises a first support and a second support, the first support is arranged on the base, a chuck arrangedon the optical fiber adapter is arranged in an accommodating chamber formed by enclosure of the first support and the second support, the shielding assembly is made of a metallic material and comprises a first shielding sleeve and a second shielding sleeve, the first shielding sleeve is connected with the first support, and the second shielding sleeve is connected with the second support. After the support assembly is fixedly arranged on the base, the shielding assembly is arranged on the support assembly for supporting the optical fiber adapter to enable the shielding assembly to be stably connected in the optical module, short circuit caused by contact between the optical fiber adapter and the shielding assembly due to instable fixing is prevented, the electromagnetic shielding performance in the optical module is guaranteed, and the transmission stability of optical signals of the optical module is improved.

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.

The invention relates to a low-stress conductive sealing adjustment device and method for an aviation light window. By using instruments and equipment such as a height indicator, a precise electric control adjustment table and an auto-collimation light pipe, special process equipment such as a light window adjustment reference tool and a light window supporting tool and a composite bonding layer,the adjustment reference of the aviation light window can be quickly established, the adjustment precision is improved, the clamping stress and the bonding stress are reduced, the adjustment stress isavoided, the optical performance is ensured while the sealing performance and the electromagnetic shielding performance of the aviation light window are ensured, and the adjustment efficiency and theadjustment quality of the aviation light window are greatly improved.

The invention provides a packaging component of a semiconductor tube core and a preparation method of the packaging component. The method comprises the following steps: setting the semiconductor tubecore on a circuit substrate, etching the peripheral edge of the semiconductor tube core such that the side surfaces around the semiconductor tube core are inclined side surfaces, sequentially forminga first polyvinyl alcohol layer, a first silver nanowire layer, a second polyvinyl alcohol layer, a second silver nanowire layer, a third polyvinyl alcohol layer and a third silver nanowire layer on the semiconductor tube core, then forming a molding layer, forming a conductive structure in the molding layer, enabling the distance between the conductive structure and the edge of a lower surface ofthe semiconductor tube core to be smaller than 5 microns, enabling the conductive structure to be electrically connected with the circuit substrate, and then performing a cutting process to form thepackaging component of the semiconductor tube core.

The invention discloses a liquid metal functional composite film and a preparation method thereof.The film structurally comprises a polymer macromolecule layer with the thickness ranging from 80 micrometers to 120 micrometers, a plurality of liquid metal in the shape of liquid drops is embedded in a thickness layer, 20 micrometers to 40 micrometers away from the surface, of one surface of the polymer macromolecule layer, the particle size of the liquid drops ranges from 500 nm to 2 micrometers, and the particle size of the liquid metal ranges from 500 nm to 2 micrometers. The content of the liquid metal in the composite film is 30-60 wt%. The preparation method of the composite film comprises the following steps: dispersing liquid metal in a polymer precursor solution; and the dispersion liquid is subjected to film forming treatment, and the liquid metal functional composite film is obtained. The prepared composite film has excellent photo-thermal conversion performance and electromagnetic shielding performance at the same time, the shielding performance of the composite film can be regulated and controlled through stretching, the preparation method is simple and efficient, and the composite film can be widely applied to the fields of communication base stations, electronic device thermal management and the like.

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 embodiment of the invention provides a shielding connection assembly, a cable assembly and a preparation method of the cable assembly, relates to the technical field of cables, and aims to solve the problem that a cable shielding connection structure is immature. The shielding connection assembly provided by the invention is used for connecting a first shielding layer and a second shielding layer, and comprises a conductive device with the first end being connected with the outer side of the first shielding layer and the second end being connected with the second shielding layer, a first shielding embedded device arranged on the inner side of the first shielding layer, a first shielding external device arranged on the outer side of the first end, a second shielding embedded device arranged on the inner side of the second shielding layer, and a second shielding external device arranged on the outer side of the second end. The shielding connection assembly provided by the invention can effectively connect the shielding layers of the two mutually connected cables, so that the effective continuity of the cable shielding effect can be ensured.

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 discloses an optical module. The optical module comprises a housing upper cover, a housing lower cover, an electromagnetic wave shielding layer and a conversion component, wherein a first groove is formed at one end part of the housing upper cover; a second groove is formed at one end part of the housing lower cover; the electromagnetic wave shielding layer is uniformly arranged on the inner walls of the first groove and the second groove; sections of the first groove and the second groove are of a semicircle shape; the conversion component is arranged in a housing formed by connecting the housing upper cover and the housing lower cover; the conversion component is used for installing a round sleeve for switching in an optical fiber in a cylinder hole formed by connecting the first groove and the second groove; and the electromagnetic wave shielding layer fills up a fit clearance of the round sleeve and the cylinder hole. According to the optical module disclosed by the invention, electromagnetic shielding performance after the housing upper cover and the housing lower cover are connected is ensured, and leakage of electromagnetic waves is prevented.

The invention discloses an anti-disassembly mechanical system for a communication box type case, and the system enables an upper cover and a base to be effectively connected together through an upper cover convex hull, prevents the upper cover from tilting, and effectively guarantees the electromagnetic shielding performance and beauty of a box type product. The anti-disassembly structure is firm and reliable and can be repeatedly used; new technologies and new concepts of circuit design, device layout, structural design and the like can be effectively prevented from being plagiarized by other competitions, and the product competitiveness of a company can be effectively improved; other people can be effectively prevented from disassembling products privately, so that product faults caused by disassembly are reduced, customer losses are reduced, and after-sales service maintenance is reduced.

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 wire of a 3D printing polylactic acid / conductive filler electromagnetic shielding composite material, a preparation method and application. The wire material provided by the invention is prepared from the following materials: 70-90 parts of polylactic acid, 10-30 parts of dextropolylactic acid and 0.5-1 part of acidized conductive filler. According to the wire disclosed by the invention, polylactic acid stereocomplex crystals are formed in situ in polylactic acid by adding the dextropolylactic acid, and the carbon nanotubes are further controlled to be uniformly dispersed in the polylactic acid by utilizing the inherent strong interaction between the polylactic acid and the dextropolylactic acid, so that the electromagnetic shielding performance of the composite material is ensured.

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 relates to the technical field of vacuum arc-extinguishing chambers, and particularly discloses an improved vacuum arc-extinguishing chamber, which comprises an insulating shell, a static contact and a movable moving contact. A corrugated pipe and a shielding cylinder are positioned in the insulating shell, the corrugated pipe sleeves the outer side of the moving contact, and a firstsolder ring is welded to seal a gap between one end of the corrugated pipe and the insulating shell; the second welding flux ring is used for welding and sealing a gap between the other end of the corrugated pipe and the moving contact; the shielding cylinder surrounds and sleeves the outer side of the first contact and the outer side of the second contact; the third solder ring is welded with the shielding cylinder and the insulating shell; the fourth solder ring is used for welding and sealing a gap between the static contact and the insulating shell. By means of the arrangement of the first solder ring, the second solder ring and the fourth solder ring, welding sealing of the first contact, the second contact and the insulating shell is achieved, and the vacuum sealing performance of the first contact and the second contact is fully guaranteed. By means of the arrangement of the third solder ring, stable connection between the shielding cylinder and the insulating shell is achieved, and the electromagnetic shielding performance of the first contact and the second contact is fully guaranteed.