31results about How to "Play a shielding effect" patented technology

The present invention provides one AC electric bridge demonstration instrument for college student to perform experiment. It has two arms comprising rotary switch and resistor and other two arms comprising resistor box, capacitor box or inductor box. It is used in perform various classical electric bridge demonstration experiments of resistor, capacitor or inductor as well as RLC serial resonance and parallel resonance experiments with no other instrument being needed.

The invention discloses a method and a device for powder magnetron sputtering coating, and belongs to the field of high vacuum magnetron sputtering coating. The device comprises a vibrating disc, an electromagnet vibrating base, a powder flow dividing baffle plate, a baffle plate for preventing powder from flowing into a guide groove, an electromagnetic shielding protective metal cylinder, and aninsulating partition plate between a material disc and the vibrating base. A spiral track grooves is formed in the edge of the vibrating disc; a protruded groove edge achieves an effect on guiding thepowder; and the powder flow dividing baffle plate achieves an effect of dividing the flow of the powder so as to prevent the powder in the disc from overflowing from the material disc because of deposition caused by an overlarge steering angle. The uppermost part of the spiral track groove of the vibrating disc is connected with an downward inclined surface which directly leads to the centre of the material disc; and the width of the inclined surface is greater than the width of the groove, which can ensure that the powder which slides down by relying on the gravity does not deposit, so thatthe powder flows smoothly continuously. According to the method and the device for the powder magnetron sputtering coating, the coating uniformity and the production efficiency can be greatly improved, and effective control of repeatability of components of a thin film in a production process can be ensured by orderly arranging, rolling and performing sputtering coating circularly and reciprocallyby adopting a powder material.

The invention relates to a remote shielding alarm system for preventing IC card information from being stolen. The system is formed by two major parts: a shielding card and a mobile phone APP software system. The shielding card is formed by a shielding signal module, a bluetooth communication module, a signal processing module and a power supply module, wherein the shielding signal module, the bluetooth communication module, the signal processing module and the power supply module are connected mutually via data signal lines; and the shielding signal module is provided with a high-frequency signal generator, a signal reception and emission antenna circuit arranged on the signal generator and a frequency-selecting circuit. The remote shielding alarm system has the following advantages: 1) the shielding distance is long: a good shielding effect can be obtained within a distance of 0-30MM of the shielding card and the IC card; and 2) the system has an alarm function: the shielding card is equipped with an LED lamp, and when lawless persons are around the IC card and carry out illegal stealing activity, the LED lamp on the system device immediately emits light and gives an alarm, and alarm signals, such as messages and the like, are sent to a mobile phone through bluetooth.

The invention relates to the technical field of electronic equipment, in particular to electronic equipment. The electronic equipment comprises a first circuit board, at least one electronic device and a support assembly; the support assembly comprises a support and a metal piece, the metal piece is arranged on the support, and the metal piece is provided with a metal terminal; at least one electronic device is arranged on the first circuit board; the first circuit board further comprises an electric contact area, and the electric contact area is connected with the grounding part of the first circuit board; the metal terminal is connected with the electric contact area; at least part of the support assembly is arranged above the electronic device; the metal terminal and at least part of the metal piece at least partially surround the at least one electronic device. According to the invention, the problem that the reliability of the shielding function and the dismounting and mounting performance of the use cannot be considered at the same time in the scheme of signal interference between the electronic device, especially the electric connector, in the existing electronic equipment and the antenna can be solved.

The invention provides a shielding box structure and an environment experiment device. The shielding box structure comprises a shielding box body and a shield door arranged on the shielding box body; the shielding box body comprises a plurality of box body plates which are connected in a seamless welding way, a cavity structure comprising a box body opening is encircled by the plurality of box body plates, and the shield door is arranged on the box body opening in close way; and a plurality of waveguide apertures are uniformly arranged on the box body plate or / and the shield door. According to the technical scheme provided by the invention, interference signals can be shielded, the hot gas in the box can be rapidly discharged, so that the internal temperature of the box is consistent with the external temperature of the box rapidly.

The invention discloses a crosstalk-resistant cable comprising an external insulating layer and a filler layer which is arranged in the insulating layer. At least one and more than one cable cores arranged between the insulating layer and the filler layer are arranged around the filler layer. Each cable core comprises a conductor layer, a first metal braided layer, a color tape and an insulator which are arranged from inside to outside. The external surface of the insulator of each cable core is provided with lubricant. Sensing fibers are distributed in the insulating layer. Each cable core is internally provided with the first metal braided layer so that the shielding effect between the cable cores can be realized and crosstalk can be reduced; and the sensing fibers can be used for judging the integrity of the insulating layer so that the problems that local insulator damage and shedding of the cable cannot be timely checked and accidents are liable to occur in the use process can be solved, the structure is simple and reliability is high and the cable has the comprehensive performance of copper and aluminum.

The invention discloses a waterproof roll and a preparation method thereof and belongs to the technical field of building waterproof materials. According to the waterproof roll, polytetramethylene ether ethylene glycol and polycaprolactone are compounded to form a polyhydric alcohol system, then a polyurethane high polymer with elasticity can be formed, the strength and the adhesion of asphalt canbe improved, buffering can be achieved, and the wearing resistance of the roll can be improved; trimellitic anhydride and diisopropanol are adopted as raw materials for an esterification reaction, asphalt molecules can be immobilized in a three-dimensional structure, the capability of preventing foreign matter embedding can be improved, and the waterproof performance can be improved; due to addition of magnesium nitrate, aluminum nitrate and urea, oxidization reaction inhibition and neutralization are implemented, a synergetic effect is achieved, chloridion invasion can be prevented, corrosion can be reduced, and a good protection function on aging resistance of the waterproof roll is achieved. By adopting the waterproof roll, the problems that a conventional waterproof roll is poor in weather resistance, aging resistance and mechanical property can be solved.

The invention provides a durable epoxy resin joint filling material and a preparation method thereof. The durable epoxy resin joint filling material comprises a component A and a component B, whereinthe component A is mainly prepared from the following raw materials: 50-100 parts of a bisphenol A epoxy resin, 10-20 parts of a phenolic epoxy resin, 5-10 parts of a hydrogenated bisphenol A epoxy resin, 50-100 parts of a flexible epoxy resin, 5-50 parts of an active diluent, 0-100 parts of an inorganic filler, 0-10 parts of a thixotropic agent, 1-3 parts of an anti-aging agent, 1-3 parts of an antioxidant and 1-3 parts of an ultraviolet absorbent; the component B is mainly prepared from the following raw materials: 10-265 parts of a modified amino curing agent, 0-3 parts of a curing agent and 0-3 parts of a curing accelerator. The component A can be mixed with the component B with the modified amino curing agent to form a solid with particularly good durability, a building joint filled with the solid is good in sealing property, and leakage caused by cracking, deformation and the like of the solid can be avoided.

The invention is applicable to the technical field of intelligent sound boxes, and provides a wireless intelligent sound box comprising a housing, a loudspeaker and a wireless communication component, wherein the wireless communication component comprises a plastic bracket, a wireless communication module fixedly attached to an upper surface of the plastic bracket, a shielding cover arranged above the wireless communication module and fixedly connected with the plastic bracket, and an elastic damping mechanism fixedly clamped between the wireless communication module and the shielding cover and having elasticity. The wireless intelligent sound box communicates with an external device through the wireless communication module, the shielding cover is arranged above the wireless communication module to shield the electromagnetic radiation, and the elastic damping mechanism is arranged between the wireless communication module and the shielding cover to form elastic contact between the wireless communication module and the shielding cover so as to play a buffering role, therefore resonant noise generated between the loudspeaker and the wireless communication component in low-frequency signals can be prevented, and the damping mechanism and the shielding cover are conducted and grounded to achieve a shielding effect.

The invention discloses an electromagnetic interference prevention mixing cable. In the cable, an electric power cable and a communication cable are directly integrated. The cable is formed by the electric power cable possessing an electromagnetic interference shielding function, a signal cable possessing an electromagnetic interference prevention capability and a protective sleeve. The protective sleeve wraps the communication cable and the electric power cable. The number of the signal cable and the electric power cable is not limited and is decided by a usage demand. The electric power cable and the communication cable shield the electromagnetic interference through a magnetic shielding material respectively, are mainly used for tight parallel wiring of strong and light current systems and are used in a condition that the light current system has a high requirement to strong current interference shielding.

The invention discloses an X-ray beam control device in a green channel detection system. A pre-collimator only gives out fan-shaped X-ray beams for parts required by items through slits; when X-rays need to be emitted out, slits in a sliding lead device align to slits in the pre-collimator by moving fast; when no X-rays need to be emitted, the slits in the pre-collimator are blocked by the sliding lead device to achieve the shielding effect, a periphery fixed lead device is additionally arranged on the outer side of the sliding lead device, and slits in the periphery fixed lead device align to the slits in the pre-collimator so that the X-rays can only be emitted out through the slit, on the outermost side, in the fixed lead device. According to the X-ray beam control device in the green channel detection system, the ray beams are fast and accurately cut off without stopping the X-rays so that the ray beams can be emitted out according to an assigned area, and the requirement that when the ray beams are cut off, the X-ray dose is safe and does not exceed standards is met.

The invention discloses an anti-vibration and anti-interference cable comprising an external insulating layer. A fireproof isolation layer, a thin aluminum powder layer, a metal protective layer and a silicon rubber internal sheath are arranged in the internal side of the insulating layer in turn. The silicon rubber internal sheath is internally provided with an aperture of which the cross section is circular. The aperture is internally provided with a "cross"-shaped silicon rubber compression resistant strip. The positions of the four corners of the silicon rubber compression resistant strip are provided with conductor cavities. Each conductor cavity is internally provided with a cable core. The cable core is provided with a copper aluminum double conductor layer, a copper plastic composite tape, an insulating isolation layer and an external shielding layer which are arranged from inside to outside. The middle position of the silicon rubber compression resistant strip is provided with a compression-resistant cavity. The gaps of the positions of the four corners of the silicon rubber compression resistant strip are provided with extruding strips which are simultaneously contacted with the silicon rubber internal sheath and the silicon rubber compression resistant strip. Each cable core is composed of the copper aluminum double conductor layer, the copper plastic composite tape, the insulating isolation layer and the external shielding layer which are arranged from inside to outside through twisting. Electromagnetic interference between the cable cores of the same cable can be prevented by the copper plastic composite tape and the external shielding layer so that the shielding effect between the cable cores can be realized. Besides, crosstalk between the cables can be effectively shielded by the metal protective layer so that crosstalk can be reduced.

The invention belongs to the technical field of electrical equipment and particularly relates to a PCB (printed circuit board) signal unit shield grounding device. The PCB signal unit shield groundingdevice comprises a shielding case used for shielding PCB signal units, connecting pieces are arranged on the outer side of the shielding case, and after the PCB signal units are shielded by the shielding case, the connecting pieces contact with the inner wall of a cabinet shell provided with a PCB. The shielding case used for shielding the PCB signal units is arranged, the connecting pieces are arranged on the shielding case, and the PCB signal units are shielded and grounded, so that problems that PCB signal units are grounded badly leading to mutual interference in the prior art are solved,the PCB signal units are assuredly well grounded, good shielding effect is achieved, normal use of the PCB signal units and the PCB is guaranteed, and good use functions are achieved.

The invention discloses a wide-energy normal-pressure air ionization chamber for a medical accelerator, and relates to an ionization radiation detection technology. The chamber includes a shell made of metal materials; an inner container arranged in the shell and forming an air layer between the inner container and the inner wall of the shell, and made of metal materials; a collector arranged in the inner container, and having the bottom penetrating through the inner container; an insulating gasket wrapped outside the collector and arranged between the inner container and the collector. An electronic system used for signal transmission and electrically connected with the collector is arranged in the base. The wide-energy normal-pressure air ionization chamber for the medical accelerator issimple in structure, convenient to install and use, and maintain.

The invention discloses a photovoltaic panel tinned copper strip, which comprises a through hole, a first plug, a fuse box, a rubber protection sleeve, a fixing clip, a steel wire rope, a second plug, a copper strip, fixing nuts, jacks, a tin layer and grinding sand. The surface of the copper strip is provided with the grinding sand so as to facilitate tin plating and enable the tin to be rapidly plated on the surface of the copper strip. The surface of the copper strip is provided with the rubber protection sleeve in a sleeved manner, thereby being effectively insulated to prevent electric leakage on the one hand and being high in safety on the one hand, and protecting the tin layer on the other hand to prevent the tin layer from being scratched, wherein the tin layer can prevent the copper strip from being oxidized and can also play an effect of shielding. One end of the copper strip is electrically connected with the first plug, the side wall of the first plug is provided with the jacks in a penetrating manner, the other end of the copper strip is electrically connected with the second plug, and the second plug is inserted into the internal parts of the jacks, thereby being conducive to electrical connection of more copper strip units. The first plug is externally provided with the fuse box, so that the safety is more guaranteed. The surface of the rubber protection sleeve is provided with the fixing clip, and the fixing clip is connected with the steel wire rope in a sleeved manner so as to protect the copper strip.

A semiconductor device, comprising: a semiconductor substrate; a ground ring positioned on the surface of the semiconductor substrate; a ground shield structure positioned on the surface of the semiconductor substrate, the ground ring surrounding the ground shield structure, the ground shield structure comprising several concentric conductive Rings, and conductive wires running through several conductive rings along the radial direction of the conductive rings, and the conductive wires are electrically connected to the grounding ring, each of the plurality of conductive rings has a plurality of openings, and the openings of adjacent conductive rings are arranged alternately; A dielectric layer located on the surface of the semiconductor substrate, the ground ring and the ground shield structure, the dielectric layer surrounding the ground ring and the ground shield structure; a semiconductor device located on the surface of the dielectric layer. The semiconductor device of the invention can improve the shielding ability, reduce substrate loss and improve the performance of the semiconductor device.

The invention discloses suaeda glauca private care traditional Chinese medicine gel and a using device thereof, and relates to the technical field of private care traditional Chinese medicine gel. The anti-inflammatory effect is improved; the traditional Chinese medicine gel comprises the following components in parts by weight: 6-10 parts of suaeda glauca powder, 12-15 parts of propylene glycol, 8-12 parts of glycerol, 5-12 parts of povidone iodine, 1-2 parts of sodium carboxymethyl cellulose and 1-2 parts of sodium alginate. The using device comprises a needle cylinder, a piston is slidably connected into the needle cylinder, a piston rod is fixed to the top of the piston and slidably connected to the inner wall of the top of the needle cylinder, and an extrusion head is arranged at the bottom of the needle cylinder; an elastic rubber ring is fixed on the inner wall of the dosing tube, the dosing tube is detachably clamped on the extrusion head through the elastic rubber ring, and a smearing part is arranged at one end of the dosing tube. The suaeda glauca powder is used for preparing the traditional Chinese medicine gel, and the suaeda glauca has the effects of diminishing inflammation and swelling, so that the efficacy of the product is effectively improved, the use effect is better, and the nursing requirements of people are met.

The invention discloses a shielding ring, a shielding structure and a casting type voltage transformer. The shielding ring includes a rubber ring and a shielding layer formed of semi-conductive crepe paper is arranged on the peripheral surface of the rubber ring; because the semi-conductive crepe paper is high The conductor of the resistor can achieve the shielding effect. The use of the rubber ring enables the shielding ring to have the ability to elastically deform. On the one hand, it uses its own elasticity to fix the shielded body when in use; In the transformer, elastic shrinkage can occur with the cooling and shrinkage of the casting body, which will not affect the shielding effect and the casting quality.

The invention relates to a deconcentrator which at least comprises an insulation structure and a shielding connection structure. A cable I is fixed at one end of the insulation structure, a cable II is fixed at the other end of the insulation structure, the number of the cable I is at least one, one cable I can be divided into at least two cables II through a deconcentrator, and the cable I and the cable II are connected in a welding or crimping mode; the shielding connection structure comprises a metal outer shell, a shielding crimping sleeve I, a shielding crimping sleeve II, a shielding conduction sheet I and a shielding conduction sheet II, and the insulation structure is assembled in the metal outer shell. According to the invention, at least one cable can be divided into two or more cables, so that the purpose of application expansion is achieved, and the requirement that a circuit branch is needed to be added to an electrical interface of a finished automobile in the automobile field is met. The shielding effect of the deconcentrator is enhanced through the shielding connection structure, the deconcentrator can be fixed with vehicle bodies of different vehicle types through the vehicle body fixing structure so as to adapt to mounting structures of the vehicle bodies of different vehicle types, and the deconcentrator has good universality and compatibility.

The invention belongs to the technical field of nuclear power plant radiation protection, in particular to a nuclear power plant copying test platform. The nuclear power plant copying test platform includes: an on-site processing unit, a radioactive probe, a remote display unit, a main frame and a side wall outer panel; the side wall outer panel forms a storage space with a side opening, and the main frame is installed In the space; the local processing unit is connected to the side of the main frame opposite to the side opening; the main frame is provided with a first drawer for installing the remote display unit, a second drawer for installing the radioactive probe, and a drawer for installing The third drawer for the radioactive source material; the third drawer is equipped with a lifting table for adjusting the distance between the radioactive source material and the radioactive probe. The test platform for nuclear power plant copying is installed in an orderly manner with the detection equipment required for nuclear power plant copying, which reduces the risk of damage to radiation monitoring equipment and enables effective tracking and maintenance of nuclear power plant radiation monitoring equipment.