445results about How to "Prevent penetration" patented technology

The invention provides a lithium metal negative electrode, a battery and a preparation method. Specifically, the lithium metal negative electrode comprises a lithium metal sheet and a first coating located on the surface of the lithium metal sheet; wherein the first coating layer is prepared from MXene modified by polyethylene glycol and-SH. MXene in the first coating has lithium affinity, a conductive network can be formed on the outer side of the lithium metal sheet, and the compatibility of the first coating and the sulfide solid electrolyte can be improved due to the existence of polyethylene glycol and-SH modification, so that the lithium metal sheet can be prevented from being in direct contact with the sulfide solid electrolyte through the first coating; ion conduction is ensured, electron permeation is inhibited, and self-discharge is reduced; in addition, polyethylene glycol enables the first coating to have certain mechanical flexibility, so that the first coating can adapt to volume change in the lithium deposition / stripping process, dendrite growth is inhibited, the cycle life of the battery is prolonged, and the safety of the battery is improved.

The utility model discloses a building toilet seepage water integral isolation drainage drainage waterproof device which comprises a drainage pipe arranged at the upper end of a sewage drainage pipe, a PVC (polyvinyl chloride) floor sealing plate is arranged on the inclined surface of a floor, a stainless steel filter plate is arranged on the PVC floor sealing plate, an accumulated water overflow cover is fixedly arranged in the middle of the PVC floor sealing plate, and the drainage pipe is arranged on the drainage pipe. Grid holes are formed in the upper end of the accumulated water overflow cover, a geotechnical cloth layer is arranged in a cavity between the accumulated water overflow cover and the stainless steel filter plate, a PVC side face sealing plate is arranged on the inner side face of the wall body, the lower end and the side face of the PVC side face sealing plate are integrally provided with bent connecting edges, and the connecting edges enable the PVC side face sealing plate and the PVC floor sealing plate to achieve electric melting sealing connection at the wall corner. The utility model not only has a simple structure and is convenient to manufacture and construct, but also can effectively prevent seepage water from seeping into the floor of the toilet, and effectively solves the hidden danger of water leakage and the difficult problem of water prevention at the place where the toilet of the building is contacted with the pipe and at the corner.

The utility model relates to the technical field of dilation catheters, and discloses a double-cavity tube of a PTA (pure terephthalic acid) balloon dilation catheter, which comprises a handle component, a double-cavity tube fitting is fixedly connected to the side end of the handle component, a guide seat is fixedly connected to the bottom end of the double-cavity tube fitting, an insertion opening is formed in the bottom end of the guide seat, and a through hole is formed in the insertion opening. According to the utility model, through the cooperative arrangement of the guide seat, the protection assembly, the extension plate and other structures, if a medical worker accidentally touches the pull plate in the process of operating the double-cavity pipe fitting, the spring is driven to be stretched, and the spring is immediately shrunk after being stretched, so that the safety of the double-cavity pipe fitting is ensured, and the safety of the double-cavity pipe fitting is ensured. The protection plate is still in a closed state, so that most of the protection plate is not easy to open due to accidental touch of medical staff, and pollutants are not easy to enter a guide wire cavity.

The utility model discloses a simple rubber waterstop connecting structure which comprises a connecting structure body used for being connected to the combination portion of a first waterstop plate and a second waterstop plate, and the connecting structure body comprises a supporting table arranged at the connecting end of the first waterstop plate in an extending mode; the lapping plate is arranged at the connecting end of the second water stop plate in an extending manner, is connected to the upper part of the supporting table and is used for connecting the first water stop plate and the second water stop plate into a whole; the connecting piece is connected to the connecting end of the first water stop plate and the connecting end of the second water stop plate and used for stably connecting the first water stop plate and the second water stop plate together. The rubber waterstop is simple in structure and novel and reasonable in design, the two adjacent rubber waterstops are tightly connected, the problems that after the rubber waterstops are installed, the joint portion possibly falls off, sealing is not tight and the like can be effectively prevented, meanwhile, the connecting pieces can ensure that the joint portion is tightly attached to the surrounding area, a good sealing effect is achieved, and the service life of the rubber waterstops is prolonged. And moisture permeation is effectively prevented.

The invention provides a top plate hydraulic formwork, and relates to the field of highway pipe gallery engineering, the top plate hydraulic formwork comprises a frame, a cross beam is fixedly connected to the inner side of the frame, a servo motor is fixedly connected in the cross beam, a linkage gear A is coaxially connected to the top of a rotating shaft of the servo motor, a hydraulic cylinder A is fixedly connected to the top of the frame, and limiting rods are slidably connected to the left and right sides of the top of the frame; a top supporting plate is fixedly connected to the top of the telescopic portion of the hydraulic cylinder A, the bottom of the top supporting plate is fixedly connected with the top of the limiting rod, side supporting plates are arranged on the left side and the right side of the frame, the side vertical faces of the side supporting plates are fixedly connected with the limiting rod, and a motor is fixedly connected to the bottom of the top supporting plate. And the top of the concrete top plate can be extruded, the top face of the concrete top plate can be flattened and shaped, the concrete top plate can be conveniently flattened and shaped, and the problem that an existing formwork cannot conveniently conduct automatic and convenient flattening and shaping on the concrete top plate is solved.

The invention discloses a composite modification film, a lithium metal negative electrode and a preparation method of the lithium metal negative electrode. The composite modified film comprises an organic polymer solid electrolyte, an inorganic solid electrolyte and a film-forming agent, and the mass ratio of the organic polymer solid electrolyte to the inorganic solid electrolyte to the film-forming agent is (10%-35%): (10%-35%): (30%-80%). The composite modified film effectively buffers cyclic stress, prevents early mechanical failure of the protective layer, and realizes mechanical durability of the interface protective layer; the immobilized film-forming agent can be slowly released, so that the continuous and stable repair of SEI is realized, the dynamic repair capability of the whole life cycle is provided, and the efficient cycle life of the battery is greatly prolonged; and the electrolyte does not need to depend on a high-concentration liquid additive, dramatic change of electrolyte components in circulation is avoided, the overall chemical stability of the battery is improved, and the stability of an electrolyte system is guaranteed.

The invention discloses a method and a device for heat preservation and decoration of an outer wall of a building. The method comprises the following steps: providing a plurality of first pipes which extend in parallel along a first direction and are fixed on the outer wall of the building, wherein the first direction is the height direction of the building; a plurality of second pipes which are connected to the first pipes in the second direction perpendicular to the first direction and fixed to the outer wall of the building are provided, so that the first pipes and the second pipes form a square frame on the outer wall of the building, and the heat preservation material is laid in the square frame to form a heat preservation layer so as to conduct heat preservation on the outer wall of the building; a hanging plate is provided, the hanging plate covers and is fixed to the square frame, and the first pipe and the second pipe are heat insulation pipes with hollow cavities. While heat preservation of the building outer wall is ensured, rain and snow water is prevented from permeating into the heat preservation layer of the building outer wall from the outside through cracks formed by cracking of the outer facade of the heat preservation layer, and cracking of the outer facade of the heat preservation layer caused by leakage and frost heaving of the heat preservation layer is further avoided.

This utility model relates to the field of electromagnetic shielding materials technology, and provides an electromagnetic shielding composite material structure, including a first shielding layer and a protective structure. A second shielding layer is disposed on one side of the first shielding layer, and a protective structure is disposed inside both the first and second shielding layers. By providing the protective structure, when electromagnetic waves are incident on the electromagnetic shielding composite material, the first and second metal film layers effectively reflect most of the electromagnetic waves back to their original direction, thus preventing electromagnetic wave penetration. Furthermore, a heat insulation layer is provided to prevent heat transfer. This heat insulation layer is an electromagnetic shielding heat insulation material with functions such as heat insulation, waterproof sealing, and corrosion resistance, thereby protecting the internal structure or equipment of the composite material from the effects of high-temperature environments. Finally, a wear-resistant layer is made of transparent PET material, which has properties such as abrasion resistance and corrosion resistance.

This invention relates to the field of battery technology, specifically to a composite negative electrode current collector, its preparation method, and its application. The composite negative electrode current collector of this invention includes a polymer material layer, a lithium replenishment layer, and a conductive metal layer. The lithium replenishment layer is located on at least one surface of the polymer material layer, and the conductive metal layer is located on the surface of the lithium replenishment layer away from the polymer material layer. The lithium replenishment layer includes a composite lithium material comprising a lithium metal core and a lithium compound coating layer covering the surface of the lithium metal core. The conductive metal layer has multiple through-hole structures. The composite negative electrode current collector of this invention, through the coordination of its various layer structures, is beneficial for improving the storage performance of the negative electrode, reducing battery impedance, shortening the electrolyte wetting time, enhancing lithium replenishment capacity, preventing the formation of lithium dendrites, and improving battery safety performance.

This invention discloses a low-hydrogen flux-cored welding wire based on two-dimensional MXene surface self-assembly modification, its preparation method, and its application, belonging to the field of welding materials technology. The low-hydrogen flux-cored welding wire comprises a steel strip outer sheath and a flux core filled within it, the flux core being composed of metal alloy powder and modified composite flux core powder. Its preparation method includes: preparing a two-dimensional MXene colloidal dispersion using a chemical etching method; cationically modifying the insulating slag-forming powder; mixing the two and electrostatically self-assembling and coating them; after drying, mixing with the metal alloy powder; filling the steel strip; and rolling and drawing into shape. This invention constructs a three-dimensional continuous conductive network within the flux core through the MXene layer, improving arc stability; simultaneously, the MXene shell forms a physically water-blocking labyrinth, endowing the welding wire with ultra-low hydrogen characteristics; the active titanium released by the decomposition of MXene at high welding temperatures can refine the weld grains and improve mechanical properties. This welding wire can be widely used in automated gas-shielded welding processes for high-strength steel.

The utility model discloses a kind of communication bridge with interface protection structure, it is related to communication bridge technical field;Adjusting mechanism is equipped in device main body, and the top of adjusting mechanism is connected with protection mechanism, and protection mechanism includes sliding plate, the top of sliding plate is equipped with connecting damping, and the top of connecting damping is equipped with lower protection plate, and the left and right ends of sliding plate each are equipped with a group of threaded shaft, the top of threaded shaft is equipped with upper protection plate, lower protection plate and upper protection plate are opposite, and the inner side of lower protection plate and upper protection plate is equipped with insulating pad, and the outer side of insulating pad is equipped with sealing pad. By sliding plate, protection mechanism is moved to the specified position of the top of device main body, then make adjusting mechanism drive protection mechanism to operate, can make the insulating pad in lower protection plate and upper protection plate to the outer layer protection of line interface, then sealing pad also will be attached, to make sealing pad to the outside protection of line, avoid water source penetration into the connecting port between line and bridge connector body.

This utility model discloses a wall hole sealing device for building construction, comprising a columnar sealing body adapted to the size of the pre-reserved hole in the wall, a central hole penetrating the center of the sealing body, an expansion mechanism penetrating the central hole inside the sealing body, and a vertical through groove on the outer wall of the sealing body for changing the diameter of the sealing body under the action of the expansion mechanism; several anti-slip protrusions are evenly arranged on the outer circumference of the sealing body to enhance the friction between the sealing body and the wall; a sealing rubber sleeve is fitted on the outer circumference of the sealing body to improve the sealing performance between the sealing body and the wall hole. The wall hole sealing device provided by this utility model, through the design of the expansion mechanism, enables the sealing body to fit tightly against the wall, increasing the friction and adhesion between the sealing device and the wall, effectively preventing the sealing device from loosening or falling off, and improving the sealing firmness.

The utility model relates to the technical field of cable manufacturing, and discloses a double-layer co-extrusion sheath cable which comprises a conductor, a conductor shielding layer, a crosslinked polyethylene insulating layer, an insulation shielding layer, a semi-conductive water-blocking tape, a soft round copper wire, a soft pure copper tape, a non-conductive water-blocking tape and a CPP tape from inside to outside. According to the double-layer co-extrusion sheath cable, the inner sheath layer and the outer sheath layer are arranged, the inner sheath layer is made of the flame-retardant PVC material with the oxygen index larger than or equal to 32%, a carbonization layer can be rapidly formed under the condition of high temperature or open fire, oxygen is effectively isolated, flame-retardant gas is released, and flame is prevented from spreading towards the interior of the cable, and the outer sheath layer is made of the high-hardness MDPE material. Although the flame retardance is general, the flame diffusion speed can be slowed down, and through the synergistic effect with the inner layer PVC, the overall flame retardant grade of the cable reaches the V-0 grade (UL 94 standard), the high-flame-retardant scene requirement is met, and the flame retardant property is further remarkably improved.

The application relates to the technical field of building waterproofing, and discloses a composite waterproof structure for a high-pressure water environment and a construction method thereof, which comprises a concrete base body including a bearing platform and a raft, the bearing platform is located on the upper surface of the raft and the side wall is exposed, a gradient pressure-resistant waterproof layer covers the exposed surfaces of the side wall of the bearing platform and the plane of the raft, and the gradient pressure-resistant waterproof layer comprises, from inside to outside, an interface reinforcing layer, a permeable epoxy resin layer which penetrates into the surface of the concrete base body by 0.5-1 mm in depth, and a dynamic response layer which is a polyurethane-rubber composite elastomer layer and is tightly attached to the outer surface of the interface reinforcing layer. The gradient pressure-resistant waterproof layer composed of the interface reinforcing layer, the dynamic response layer and a rigid protective layer is combined with the bearing platform and the raft in the concrete base body, and the rigid protective layer enhances the wear resistance, so that the composite waterproof structure with high pressure resistance and high wear resistance is realized, and the stability and durability of the waterproof structure in the high-pressure water environment are effectively improved.

The utility model relates to the technical field of film detection, in particular to a film defect detection device. The device comprises a film viewing cavity arranged in a darkroom, the film viewing cavity comprises a main cavity defined by baffles and a middle platform layer arranged in the main cavity, a light through hole is formed in the middle platform layer, a xenon lamp is installed at the top of an upper cavity so that light can irradiate a to-be-detected film at the light through hole, and a defect imaging curtain is laid at the bottom of a lower cavity so that the to-be-detected film can be detected. The shadow left by the thin film at the light through hole is received; light penetrates through the thin film, shadow is projected on the defect imaging curtain laid at the bottom of the lower cavity, due to the fact that the xenon lamp with higher light penetrating power is selected, slight deformation type defects of the thin film can be seen on the defect imaging curtain, the defects of an existing thin film defect observation mode are overcome, and the tiny and slight deformation type defects of the thin film can be seen.

This invention relates to the field of polymer materials technology, specifically disclosing a flame-retardant thermoplastic elastomer compound and its preparation method. The flame-retardant thermoplastic elastomer compound comprises 50-80 parts SEBS, 10-30 parts PP, 5-15 parts compatibilizer, 10-30 parts composite flame retardant, 3-10 parts plasticizer, 0.2-1 parts antioxidant, and 0.1-0.5 parts lubricant. The composite flame retardant is prepared by reacting and mixing an intumescent flame retardant, barium metaphosphate, boron nitride, triallyl isocyanurate, and SEBS. The flame-retardant thermoplastic elastomer compound of this application possesses good flame retardancy, mechanical properties, and water resistance stability.

The utility model discloses a vertical shaft type water inlet and outlet structure of permanent and temporary combination in the technical field of water conservancy and hydropower engineering, including vertical shaft diffusion section, the outside of vertical shaft diffusion section is from top to bottom sequentially provided with a plurality of arch wall, the periphery fixed connection of vertical shaft diffusion section has a plurality of pile foundation, the arch wall is located between pile foundation and vertical shaft diffusion section. The utility model discloses a pile foundation is arranged outside vertical shaft diffusion section, can guarantee the stability of vertical shaft excavation process, sets up the arch wall between pile foundation and vertical shaft diffusion section, and the arch wall is as supporting wall body and structure outer wall simultaneously, need not to set up horizontal temporary support additionally, guarantees the safety of excavation process, and also does not have the problem of dismantling, to reduce the construction step, shortens the period of construction.

The present application relates to the technical field of conductive foil, specifically to a multilayer composite conductive foil and its preparation method and application, specifically comprising the following steps: S1. aluminum foil is immersed in NaOH solution and then cleaned with deionized water, dried to obtain pretreated aluminum foil; S2. using a magnetron sputtering instrument, using a Ti-Zn-C-Ni composite target material to sputter the pretreated aluminum foil, and obtaining a transition layer conductive foil after deposition; S3. the modified functional slurry is coated on the surface of the transition layer conductive foil by a doctor blade coater, then added to an oven for segmented curing, and then annealed, and after cooling to room temperature, a multilayer composite conductive foil is obtained. The present application forms a strong adhesion bottom layer with the substrate through the composite process design of sputtering and coating, blocks the corrosion of electrolyte to the substrate, and also bears the conductive and catalytic functions. The two functional layers obtained by the two processes are further fused through annealing treatment, forming a gradient interface, eliminating interlayer stress, and improving the overall structural stability.

This disclosure provides a control circuit and electronic device for system overvoltage protection. The control circuit includes an overvoltage detection module, a fast charging interface module, and a system power module. One end of the overvoltage detection module is connected to the fast charging interface module, and the other end is connected to the system power module. The fast charging interface module is connected to the system power module. The overvoltage detection module is used to detect a first voltage input from the fast charging interface module to the system power module. When the detected first voltage is greater than a preset threshold, it sends a shutdown signal to the fast charging interface module to disconnect the line between the fast charging interface module and the system power module.

The application discloses a method for preparing submicron and micron alkylated graphene oxide by using coal, and comprises the following steps: 1, graphitizing coal powder to rearrange carbon atoms and grow submicron crystal regions; 2, oxidizing and peeling the graphitized coal under the action of sulfuric acid, phosphoric acid and potassium permanganate; 3, adding hydrogen peroxide to react with potassium permanganate and high-valence manganese salt in the solution until the solution turns yellow; 4, screening the solution to remove unreacted black impurities; 5, centrifuging the solution to reserve the precipitate, and then washing and centrifuging the precipitate with dilute hydrochloric acid and ethanol; 6, dispersing the precipitate with diethyl ether, and then obtaining graphene oxide powder through suction filtration. The prepared graphene oxide has an average size of 800 nm, an average layer number of 1-2 layers, and a yield of 107%. The method has simple steps, low cost and high yield, and is easy to realize industrial production, and has a very broad prospect in the present situation of urgently realizing high-value utilization of coal.

The utility model discloses a kind of block wall structure with anti-infiltration structure, it is related to block wall technical field, including block body, the upper surface outer edge of the block body is provided with transverse groove, the lower surface outer edge of the block body is provided with transverse protrusion, the transverse protrusion is matched with the transverse groove of adjacent block body, the left side surface outer edge of the block body is provided with vertical protrusion, the right side surface outer edge of the block body is provided with vertical groove, the vertical groove is matched with the vertical protrusion of adjacent block body, positioning assembly is provided on the block body;The utility model is formed by transverse protrusion and transverse groove, vertical protrusion and vertical groove, and "Z" shape masonry gap, so that there is height difference and distance difference between outer edge and internal masonry gap, effectively block rainwater into wall interior.

The utility model relates to the technical field of damp-proof and dry maintaining devices, in particular to a building underground structure damp-proof and dry maintaining device which comprises a basement wall body, the inner wall of the wall body is coated with a damp-proof coating to reduce the damp risk of the wall body, and a damp-proof layer is fixedly arranged on the outer side of the wall body to effectively prevent underground water or rainwater from leaking. Meanwhile, the interior of the basement is kept dry and comfortable, a heat preservation layer is fixedly arranged on one side of the damp-proof layer, a waterproof and vapor-proof layer is arranged on one side of the heat preservation layer, moisture and water vapor are prevented from entering the basement through dual protection, an empty layer and a pipeline are arranged between the heat preservation layer and the waterproof and vapor-proof layer, and moisture is allowed to enter the interior of the pipeline from the empty layer; the water-proof and vapor-proof layer is used for pumping water and discharging the water to the outside through a negative pressure pumping device, dry air is introduced, the humidity of the empty layer and the wall body is reduced, the dry state is maintained, a flow guide plate used for preliminary moisture prevention is fixedly arranged on one side of the water-proof and vapor-proof layer, and a fixing box used for collecting permeated water is clamped to the bottom of the flow guide plate.

The application discloses a kind of oil-containing water body separation membrane for refining process of Bupleurum volatile oil and preparation method and application.The preparation method of the application is first mixed and dissolved according to proportion with cellulose acetate and cellulose nitrate powder, form casting membrane liquid, and the base membrane is prepared using non-solvent phase conversion method;Second, the film is deacetylated;After that, it is soaked in acyl chloride n-hexane solution for crosslinking;Finally, by in-situ hydrolysis of silane coupling agent on the membrane surface, a hydrophobic surface is prepared, and an oil-containing water body separation membrane for refining process of Bupleurum volatile oil is obtained.This method forms a hydrophobic layer on the surface of the membrane, which strengthens the rapid passage of Bupleurum volatile oil molecules and inhibits the penetration of water;Using the oil-containing water body separation membrane avoids the formation of emulsion during oil-water separation, showing high separation efficiency and stability, and widening the application of cellulose acetate membrane in traditional Chinese medicine preparation process.

The utility model relates to the technical field of battery modules, and provides a battery module cover plate which comprises a cover plate body, a groove and a first air bag are arranged on the inner side of the cover plate body, and the groove is communicated with the first air bag through an inflation channel; a control seat capable of axially moving is arranged in the groove, the control seat is in sealing fit with the inner wall of the groove, and the moving stroke of the control seat is configured to drive the first air bag to expand by compressing air in the groove. Through collaborative design of the control seat and the first air bag, active inflation sealing is realized, and when the battery module shell is assembled, mechanical force of shell assembly is converted into air pressure energy in the air bag, so that the second sealing element is more tightly and uniformly attached to a sealing surface, and the battery module shell is particularly suitable for scenes with complex curved surfaces or uneven sealing surfaces; and the initial sealing reliability is obviously improved.

The invention discloses an oil-resistant cold-resistant flame-retardant polyvinyl chloride material and a preparation method thereof. The polyvinyl chloride material is prepared from the following raw materials in parts by weight: 100 parts of PVC resin, 40-60 parts of a plasticizer, 30-50 parts of a flame retardant, 15-25 parts of a cold-resistant agent, 10-20 parts of an oil-resistant agent, 5-10 parts of a heat stabilizer and 2-5 parts of a lubricant. Wherein the flame retardant is a composite flame retardant composed of aluminum hydroxide, magnesium hydroxide and antimony trioxide, the cold-resistant agent is an ethylene terpolymer, and the oil-resistant agent is a polar copolymer of acrylonitrile and butadiene. The material is excellent in comprehensive performance, the low-temperature impact performance can pass minus 40 DEG C, after an oil resistance test, the mechanical property loss is extremely small, the oxygen index is maintained to be about 30%, the stable mechanical property and thermal stability are achieved, collaborative optimization of oil resistance, cold resistance and flame retardance is achieved, and the service life of the material is prolonged. The cable is suitable for cable preparation under complex working conditions such as automobile engine cabins, industrial equipment in extremely cold areas and petrochemical engineering, the preparation process is high in controllability, and industrial production is easy.

The application provides a display panel and a display device. The display panel comprises: a substrate having a display area and a non-display area, the non-display area comprising a binding area located away from the display area; a protective adhesive layer arranged in the non-display area and covering at least the binding area; a polarizer located at least in the display area and extending at least to the edge of the protective adhesive layer; a first barrier structure arranged in the non-display area and located between the protective adhesive layer and the polarizer; and the polarizer covering at least part of the first barrier structure. The display panel can avoid forming a water vapor invasion path at the edge of the polarizer, effectively prevent water vapor penetration, and significantly improve the reliability and service life of the display panel.

This utility model relates to the technical field of integrated devices for essential oil distillation and extraction. It discloses an integrated device for essential oil distillation and extraction, comprising a frame, a reaction vessel mounted on the surface of the frame, a control cabinet mounted on the surface of the frame, a condenser mounted on the surface of the frame, and a heat insulation structure on the surface of the frame. The heat insulation structure includes a support, which is fixedly connected to the surface of the frame. A U-shaped frame is fixedly connected to the surface of the support, and a bidirectional screw is rotatably connected to the surface of the U-shaped frame. Two drive arms are threadedly connected to the surface of the bidirectional screw. This integrated device for essential oil distillation and extraction, by setting up the heat insulation structure, effectively blocks external heat from penetrating into the condenser, ensuring that the cold water inside the condenser maintains a stable low temperature and a sufficient temperature difference with the mixed steam, guaranteeing heat exchange efficiency and preventing the loss of essential oil with unliquefied steam due to incomplete condensation.

The utility model relates to loudspeaker technical field especially relates to a dustproof waterproof micro loudspeaker. It includes installation main shell, is provided with loudspeaker main body spare in the installation main shell, is provided with dustproof waterproof subassembly in the installation main shell top screw thread, is provided with first dustproof shell in dustproof waterproof subassembly top screw thread. The dust screen one (the larger number of meshes) of utility model top setting filters big particle dust first, the dust screen two (the smaller number of meshes) of outer layer further blocks fine dust, forms the double protection of rough filter plus fine filter, avoids the dust accumulation influence loudspeaker sounding efficiency, and the threading groove of installation main shell bottom is covered by fixed shell, and the inside seal plug passes through the elastic extrusion package connecting line, prevents dust from entering the shell inside from the line interface, ensures that loudspeaker main body spare is long -term clean.

The utility model provides a kind of multiple combination sealing type roller chain, belong to roller chain technical field.It includes pin shaft and respectively the outer chain plate of being set in the both ends of pin shaft, bushing is set in pin shaft, bushing both ends are respectively set with inner chain plate, roller is set in bushing, clearance fit is formed with lubricating portion between pin shaft and bushing, oil supply path is equipped in pin shaft with lubricating portion intercommunication, bushing both ends are respectively equipped with combination sealing assembly, combination sealing assembly includes the first sealing structure being arranged between bushing and outer chain plate, second sealing structure is also equipped between outer chain plate and inner chain plate outside the first sealing structure side.Lots of sealing structures form multiple sealing barrier in bushing end portion, ensure that can effectively block particle impurity and seawater penetration, can effectively prolong the retention time of lubricating oil, significantly improve the sealing effect and sealing life of bushing end portion.

The utility model provides a kind of host computer of electronic mask, including the host computer of cooperation with electronic mask and the charging seat for charging host computer, the host computer includes bottom shell, upper cover, circuit board and battery, the circuit board is detachably installed on bottom shell, two magnets are equipped between the circuit board and bottom shell, the magnet is connected between circuit board through conductive spring leaf, the magnet is in convex shape, smaller one end is penetrated bottom shell and contacts and conducts electricity with electronic mask, to conduct micro-current for electronic mask, magnet and circuit board are connected through conductive spring leaf, while guaranteeing conduction, it can prevent disconnecting when equipment is vibrated, and the conductivity of conductive spring leaf is also more stable;At the same time, the equipment is charged by conductive copper column and PIN needle contact energization, the host computer is not provided with interface, and the host computer can avoid being penetrated by essence liquid.