23results about How to "Realize the shielding effect" patented technology

The present application relates to a green and low-carbon functional inorganic rock coating artistic effect paint and a preparation method thereof, belonging to the field of coating technology. The present invention modifies the waterborne epoxy resin emulsion and introduces amino calcium carbonate and modified carboxymethyl cellulose at the same time. The multi-components work together to effectively improve the adhesion level and obtain good salt spray resistance and aging resistance.

The utility model relates to a mounting structure of PCB board large current conductor, this mounting structure includes metal base, PCB board, large current conductor and upper shell, the recessed groove for the large current conductor inlay is integrally arranged on the metal base, the PCB board sets up on the upper surface of metal base, the utility model discloses through embedding the large current conductor on the PCB board into the recessed groove inside the metal base, realizes the all -round metal surrounding and shielding of large current conductor, effectively avoids the electric field, magnetic field signal radiation to outside of the current on the large current conductor, realizes better EMC shielding effect.

The application belongs to the field of new materials, and discloses a lead-free perovskite X-ray shielding composite material and a preparation method and application thereof, and comprises the following steps: mixing ANF / DMSO dispersion liquid with ethanol to obtain re-protonated ANF dispersion liquid; mixing the re-protonated ANF dispersion liquid, CsI powder and ethanol, and stirring to obtain two portions of the same CsI / ANF dispersion liquid; mixing re-protonated ANF, Cs3Bi2I9 powder and ethanol, and stirring to obtain Cs3Bi2I9 / ANF dispersion liquid; sequentially filtering the first portion of CsI / ANF dispersion liquid, the Cs3Bi2I9 / ANF dispersion liquid and the second portion of CsI / ANF dispersion liquid by using a gel-gel method, and vacuum hot-pressing to obtain a composite gradient film with a biomimetic symmetrical structure, which is used as a lead-free perovskite X-ray shielding composite material; and the application realizes continuous and efficient X-ray shielding effect, and can improve the mechanical flexibility and thermal stability of the material.

The utility model discloses an anti-interference cable which comprises at least one wire core, an inner sleeve, an outer sleeve, a filling layer, an inner shielding layer, an outer shielding layer and an adjustable shielding layer, the wire core is wrapped by the inner sleeve, the inner sleeve is wrapped by the outer sleeve, and the filling layer is arranged between the inner sleeve and the outer sleeve. The inner shielding layer, the outer shielding layer and the adjustable shielding layer are sequentially arranged outside the outer sleeve from inside to outside, the adjustable shielding layer is composed of a spiral pipe, and the spiral pipe is filled with a conductive solution. According to the anti-interference cable, the anti-interference performance can be controlled, and the length can be cut at will.

The utility model relates to the technical field of frequency converter insulation and heat dissipation, and discloses a high-power frequency converter insulation and heat dissipation structure which comprises a bottom plate, foot columns and side columns, the foot columns are fixedly connected to the four corners of the upper surface of the bottom plate, and the side columns are fixedly connected to the middle portions of the two sides of the upper surface of the bottom plate. According to the high-power frequency converter insulation heat dissipation structure, the bottom plate, the foot columns and the side columns are combined to form a frame structure used for bearing the heat dissipation assembly and the frequency converter, meanwhile, the rigidity of the whole structure is enhanced, and the frame structure is made of a steel material, can be directly used for grounding and has heat dissipation, impact resistance and lightning stroke resistance performance; the outer side vacant part of the frame body is filled with the side plates, the top of the frame body is sealed and covered with the top plate, the side plates and the top plate are made of metal materials such as copper with high heat conduction performance and high conductivity, the heat dissipation and signal shielding capacity can be achieved, meanwhile, the interior of each side plate is a hollow outer layer, heat dissipation fins and arc-shaped pieces are installed, the heat dissipation area can be increased, and the heat dissipation efficiency is improved. And the heat dissipation effect is improved.

The utility model discloses an arc extinguish chamber structure of a circuit breaker, comprising a body, the body is provided with at least two cavities, each cavity accommodates an arc extinguish grid sheet group, an insulating part is arranged between two adjacent cavities, the insulating part limits arc channeling of the two adjacent arc extinguish grid sheet groups, the insulating part is provided with a shielding part, and the shielding part isolates magnetic fields of the two adjacent cavities; the arc extinguishing structure is formed by the plurality of arc extinguishing grid sheet groups, so that the cutting arc extinguishing effect of the arc is improved, and secondly, the shielding part is arranged, so that the situation that the movement of the arc and the arc extinguishing effect are influenced due to interference of magnetic fields of two adjacent cavities in the using process is prevented.

The utility model discloses a column-free magnetic cell sorting device which comprises a magnetic sorting mechanism, bases and moving mechanisms, the bases and the moving mechanisms are positioned on two sides of the magnetic sorting mechanism, each base is provided with one moving mechanism, the magnetic sorting mechanism comprises a supporting component, a magnetic component and a metal sleeve, and the magnetic component is fixedly arranged in the metal sleeve; a magnet structure of the magnetic assembly is a Halbach array, the top surface of the supporting assembly is used for placing a storage container in which a sample solution is stored, the supporting assembly comprises a base plate and a metal plate, a through hole penetrating through the length direction of the base plate is formed in the base plate, and the metal plate is accommodated in the through hole; the moving mechanism is used for pushing the metal plate to move in the length direction of the through hole. The column-free magnetic cell sorting device disclosed by the utility model can be used for effectively and controllably activating and shielding a magnetic field, and ensuring that an invalid magnetic field is weakened and the magnetic field intensity of a sorting area is enhanced in a working state, so that the magnetic cell sorting effect is improved.

The utility model relates to a protector and electronic equipment, and the protector is used for achieving the protection of a circuit element, and comprises a contact part which is used for making contact with the circuit element in a first direction; the grounding part is used for grounding the contact part; a connection portion connected between the contact portion and the ground portion; in the first direction, at least part of the contact part is located between the connecting part and the grounding part. According to the protector, the contact part making contact with the circuit element in the first direction and the grounding part making the contact part connected with the ground are arranged, the contact part and the grounding part are connected through the connecting part, a path for releasing static electricity is provided, interference of a static radiation field to the circuit element is reduced, and the shielding effect on the circuit element is achieved; meanwhile, at least part of the contact part is arranged between the connecting part and the grounding part in the first direction, so that the connecting part can bypass the side space of the protector to be connected with the grounding part, and occupation of the side space of the circuit element is reduced.

This invention relates to electrical component connection devices, and more specifically to the field of circuit board connection device technology. It discloses a circuit board fixing device for communication engineering construction, comprising a circuit board body with positioning holes and a positioning part. The positioning part includes a mounting base plate with a bottom groove and a recessed groove on its inner wall. Two leaf springs abut against each other to form elastic support. A pre-reserved gap in the wedge groove of the wedge block and compensation block allows the device to adapt to the thickness deformation of the circuit board due to temperature changes. Simultaneously, the tension spring drives the clamping ring to always abut against the surface of the circuit board. The elastic deformation of the leaf spring and the displacement compensation of the wedge structure work together to solve the problems of damage to the circuit board due to excessive clamping at high and low temperatures or displacement due to excessive clamping, achieving an adaptive and stable clamping effect for the circuit board under temperature-changing environments.

The application discloses a sealing mechanism with automatic rotating opening and closing function and belongs to the technical field of cabin sealing structure. The sealing mechanism comprises a cylinder body and sealing assemblies arranged on both sides of the cylinder body. The sealing assembly comprises a baffle, a pressing plate, a rotating pin shaft and an elastic assembly. The elastic assembly is arranged on the baffle and fixedly connected with the cabin at the other end. The baffle is provided with a first connecting sleeve. One end of the pressing plate is sleeved on the first connecting sleeve. The rotating pin shaft is coaxially arranged in the pin shaft through hole of the baffle, the first connecting sleeve and the pressing plate. The locking piece arranged on the side of the pressing plate is fixedly connected with the part of the rotating pin shaft inserted into the pressing plate, so that the pressing plate is fixedly assembled on the baffle. The conductive strip is glued on the arc end surface of the baffle and the pressing plate in contact with the cylinder body. The application realizes the functions of quick sealing and automatic resetting of the sealing mechanism without manual and mechanical actions.

The invention relates to the technical field of sealing shielding doors, and provides a sealing shielding primary-secondary door which comprises a door frame, a vertical hinged door is connected into the door frame through hinges, a sealing door plate is arranged between the vertical hinged door and the door frame, a connecting hole is formed in the vertical hinged door, and a connecting rod in sealing sliding fit with the connecting hole is arranged on the plate face of the sealing door plate. The vertical hinged door is provided with a driving assembly used for driving the sealing door plate to change the distance between the sealing door plate and the vertical hinged door, through the arrangement of the double-layer movable door plate of the vertical hinged door and the sealing door plate, when the vertical hinged door is closed, the driving assembly is used for driving the sealing door plate to move, and the distance between the vertical hinged door and the sealing door plate is expanded; therefore, the sealing door plate is tightly abutted against the door frame to realize shielding and sealing.

The present application relates to the technical field of power system grounding fault detection, in particular to a single-phase grounding fault intelligent line selection method for a small-current grounding system of a distribution network, which locks a transient signal interception window through a zero-sequence voltage instantaneous value, accurately extracts a zero-sequence current high-frequency component signal corresponding to a high-frequency frequency band level by using discrete wavelet packet decomposition, and determines a morphological difference value based on an energy distribution deviation of a feeder compared with other feeders, so as to convert absolute magnitude discrimination into a comparison of frequency band distribution forms, and eliminate the interference of high-frequency transformation errors of underlying mutual inductors on a decision result; in combination with a total energy weight representing a physical scale of a signal, a morphological distribution artifact generated by weak white noise is identified and suppressed in a targeted manner; by fusing the morphological difference value and the total energy weight, deep mining of a fault branch distribution structure feature and adaptive shielding of noise interference are realized, so that the single-phase grounding fault intelligent line selection for the small-current grounding system of the distribution network is more accurate.

The invention discloses a multi-spectrum composite profiling camouflage material and a processing method thereof, and belongs to the technical field of profiling camouflage material preparation. The multi-spectrum composite profiling camouflage material sequentially comprises a PU hydrophobic matrix layer, an infrared reflecting layer, a transition layer, a wave absorbing layer and a camouflage layer, wherein the PU hydrophobic matrix layer is prepared from PU stone and hydrophobic organic matter; the infrared reflecting layer material is prepared from distilled water, nano titanium dioxide, silicon dioxide, a dispersing agent, a defoaming agent and a binding agent; the transition layer material is prepared from epoxy resin and aluminum powder; the wave absorbing layer material is prepared from m-bromoacetophenone, thiophene-2-formaldehyde, nitromethane, ammonium acetate, N, N-diisopropylethylamine, N-bromosuccinimide and short carbon fibers; the camouflage layer is made of camouflage pigment and nylon. The profiling camouflage material prepared by the method has excellent waterproof performance and shielding performance.

The invention provides a preparation method of a connector with a secondary lock, and the method comprises the steps: axially stripping a cut cable sheath, reversely sleeving the periphery of a shielding ring with a braided wire, and cutting the cable again until an internal core wire is exposed, thereby saving the braided wire material, and improving the production efficiency. On the other hand, the shielding effect on unexpected signals can be achieved through the weaving wires arranged on the periphery of the shielding ring in a sleeving mode, and therefore the transmission stability of the expected signals is improved; besides, by reversely sleeving the braided wire between the periphery of the shielding ring and the inner wall of the outer conductor, a radial gap between the periphery of the shielding ring and the inner wall of the outer conductor can be filled, stable positioning of the internal shielding ring after crimping of the outer conductor is ensured, and unexpected radial deformation of the shielding ring during installation and use is avoided. The service life is prolonged.

The utility model discloses a surface-mounted inductor which comprises a bottom plate and a shell, the bottom plate and the shell define a space for containing a magnetic core and a winding wire, a containing groove is formed in the upper surface of the bottom plate, and the bottom of the magnetic core is mounted in the containing groove in a surface-mounted mode. The winding wire is wound on the peripheral side of the magnetic core; conductive columns are arranged at the two ends of the bottom plate, and the leading-out end of the winding wire is communicated with the conductive columns; a first heat dissipation through hole is formed in the side edge of the containing groove, the first heat dissipation through hole is in a broken line shape, one end of the first heat dissipation through hole abuts against the bottom of the magnetic core, and the other end of the first heat dissipation through hole penetrates through the bottom plate. According to the patch type inductor, the first heat dissipation through holes abutting against the magnetic core are formed, heat generated by the magnetic core is effectively discharged out of the outer side of the bottom plate, the heat dissipation efficiency of the patch type inductor is improved, and long-time stable operation of the patch type inductor is ensured.

The utility model discloses a shielding brick of a particle therapy radiation protection building, and relates to the technical field of shielding bricks. The main body assembly comprises a shielding brick, a groove formed in the side wall of the outer surface of the shielding brick, a convex block arranged on the side wall of the outer surface of the shielding brick, a square groove formed in the shielding brick, a lower partition groove formed below the square groove, an upper partition groove formed above the square groove and a partition plate arranged outside the square groove; the frame groove is formed outside the lower partition groove and the upper partition groove; the connecting assembly comprises a first square block arranged on the upper surface of the shielding brick, a first clamping groove formed in the side wall of the first square block, and a second square block arranged on the lower surface of the shielding brick. The shielding brick provided by the utility model solves the problems that the shielding brick is in an integrated design, only two sides of the shielding brick adopt the uneven surface design, the shielding of the shielding brick on radiation of different frequency bands is reduced, the reflection and scattering of the radiation when the radiation passes through the shielding brick are reduced, and the blocking effect on the radiation is reduced.

A zirconium hydride-based moderation shielding material containing gadolinium oxide / samarium oxide / europium oxide, its preparation method, and its application belong to the field of radiation shielding technology. It solves the problems of hydrogen loss, cracking, and poor thermal stability inherent in existing zirconium hydride materials. The material of this invention has a density of 5.58–5.71 g / cm³. 3 The hydrogen content is 1.6wt%~1.83wt%. The mass proportions of each substance in the total amount of ZrH2, Gd2O3, Sm2O3 and Eu2O3 are: 99%≤ZrH2<100%, 0%≤Gd2O3≤1%, 0%≤Sm2O3≤1%, 0%≤Eu2O3≤1%, 0%<Gd2O3+Sm2O3+Eu2O3≤1%. The hydrogen release initiation temperature is ≥557℃. Utilizing multi-element synergistic absorption, the shielding efficiency for 1MeV fast neutrons is ≥97.5%, and the thermal neutron proportion is reduced by ≥80%. It is suitable for small nuclear power reactors below 600℃.

The invention discloses an electric control system of a fracturing truck. The system comprises a fracturing truck electric control room and a fracturing truck control unit in remote communication connection with the fracturing truck electric control room. The fracturing truck electric control room is connected with a fracturing motor on the fracturing truck frame through a high-voltage cable; the fracturing truck electric control room is used for controlling a fracturing motor according to the fracturing truck displacement adjusting instruction and the fracturing truck set total displacement adjusting instruction so as to realize self-adaptive control of the fracturing truck set; the fracturing truck control unit is used for generating a fracturing truck displacement adjusting instruction and a fracturing truck set total displacement adjusting instruction according to the maximum capacity of the high-voltage power grid of the fracturing truck set in combination with the multi-path power grid load distribution problem and the high-load-rate tripping problem in the fracturing construction process. According to the invention, not only are automatic control and remote operation of the fracturing truck set realized, but also automatic intervention and self-adaptive control of the power grid capacity and the fracturing truck set are realized by combining a multi-path power grid load distribution problem and a high-load-rate tripping problem in the fracturing construction process.

The invention discloses a small-size shielding type electromagnetic metamaterial design method for a KHz segment, and relates to the technical field of metamaterial design, and the method comprises the steps: constructing a double-layer end-to-end spiral coil electromagnetic metamaterial element model, carrying out the simulation of the model, obtaining an inductance parameter and a resistance parameter, and determining an external lumped capacitance parameter and a quality factor; judging whether near-zero magnetic conductivity possibly occurs or not; simulating the newest model to obtain a solution of the element resonant frequency, and comparing the solution with the resonant frequency required by the design; calculating geometric factors of the model; calculating to obtain a curve of the complex permeability of the electromagnetic metamaterial; determining a point of which the magnetic conductivity is zero and selecting an own target near-zero interval; and simulating the designed model, and observing the shielding effect. The metamaterial is simple and convenient to operate, the efficiency and repeatability of the design and manufacturing process are improved, the small size of the metamaterial is achieved, the low-frequency-band and high-efficiency electromagnetic shielding requirements can be met, and high practicability and market value are achieved.

The utility model discloses a case structure with a shielding layer structure, which comprises a frame and a conductive pattern, the frame is provided with a plurality of plate bodies and encloses a case body with an accommodating space inside, and the conductive layer is integrally formed with the plate bodies or covers the surfaces of the plate bodies; compared with an existing design, the relatively closed shielding body is defined by the multiple conducting layers, the conducting layers can be formed on all the frame bodies through the arranged conducting layers so that shielding and isolation of electromagnetism can be achieved, and meanwhile the multiple plate bodies can selectively cover or be directly formed in the plate bodies according to different positions; therefore, after a plurality of plate bodies provided with the conducting layers are installed on the frame, a closed virtual shielding body is formed, and the requirement for an existing EMC test is met.

The present application provides a circuit board module assembly method, a circuit board module and a terminal device, the assembly method comprising: providing a circuit board assembly, a shielding cover and a plurality of solder balls, the circuit board assembly comprising a circuit board, a functional device and a plurality of solder pads, the functional device and the plurality of solder pads are all installed on the same side of the circuit board, the plurality of solder pads are all arranged around the functional device, and are all spaced apart from the functional device and spaced apart from each other, the shielding cover comprises a plurality of soldering parts, and the plurality of soldering parts are spaced apart from each other; placing the shielding cover on the circuit board, and covering the functional device, the plurality of soldering parts are respectively arranged opposite to the plurality of solder pads; placing each solder ball between at least one soldering part and at least one solder pad, melting and solidifying each solder ball, and at least part of each solder ball forms a soldering part connected between at least one soldering part and at least one solder pad. The assembly method can reduce the influence of temperature on the functional device during the welding process, and ensure the reliability of the functional device.

The invention provides a preparation method of a connector. The preparation method comprises the following steps: sleeving a metal sleeve into a first axial preset position on the periphery of a cable from the front end of a terminal; then uniformly brushing the weaving wire and enabling the weaving wire to reversely sleeve the periphery of the metal sleeve, and sleeving the periphery of the cable with a die-casting shell from the front end of the cable until the die-casting shell reaches a second axial preset position; and then the metal sleeve drives the braided wires to be pushed out from the rear end of the terminal to the front end of the terminal until the braided wires are in contact with the rear end of the die-casting shell, so that braided wire materials can be saved, the shielding effect on unexpected signals can be realized through the braided wires reversely covering the die-casting shell, and the transmission stability of the expected signals is improved. Besides, the braided wires are reversely arranged between the inner wall of the metal sleeve and the outer edge of the die-casting shell, so that a radial gap between the inner wall of the metal sleeve and the outer edge of the die-casting shell can be filled, stable installation and positioning are ensured, unexpected radial deformation possibly caused in the installation and use process of the cable is avoided, and the service life is prolonged.

The utility model relates to a novel electromagnetic shielding curtain which comprises metal wires, at least two protective layers and a shielding layer, the shielding layer is arranged between the two protective layers, and the metal wires are arranged on the shielding layer. A connecting assembly is arranged between the two protective layers, and the edges of the two protective layers are connected or separated through the connecting assembly. The two protective layers are matched with the shielding layer, the two protective layers can wrap the two sides of the shielding layer, so that the shielding layer is externally protected, when the whole curtain cloth is finally cleaned, the two protective layers are detached, the protective layers are directly and independently cleaned, cleaning is carried out in a conventional mode, and the cleaning efficiency is greatly improved. No matter hand washing or equipment washing is adopted, the shielding layer does not need to be damaged, so that the washing process is simple and convenient, and time consumption is avoided.