242results about How to "Prevent extension" patented technology

The invention relates to the technical field of building materials, and particularly discloses high-strength lightweight concrete containing hollow glass beads and a preparation method of the high-strength lightweight concrete. The high-strength lightweight concrete containing the hollow glass beads is prepared from cement, fly ash, carbon fiber grafted hollow glass beads, lightweight sand, deionized water, polypropylene fiber grafted rubber particles and a water reducing agent according to the mass ratio of (58-75): (25-38): (45-65): (20-40): (42-55): (35-55): (5-12) through mixing, mold filling, vibration molding, covering and demolding. The addition amount of the hollow glass beads is strictly controlled, the influence on the overall strength of the concrete is avoided, the density and weight of the concrete are reduced due to the addition of the light sand and the hollow glass beads, the compactness and integrity of the concrete are improved due to the synergistic effect of the two added fibers, and the raw materials have excellent cohesiveness; the concrete can effectively absorb and disperse stress, and has the advantages of excellent strength, light weight, good durability and excellent comprehensive performance.

The invention relates to the technical field of high polymer materials, and particularly discloses a high-strength polypropylene composite material for a filter plate and a preparation method of the high-strength polypropylene composite material. The preparation method of the polypropylene composite material comprises the following steps: uniformly mixing polypropylene, polyimide, maleic anhydride grafted polypropylene, nylon 6, a maleic anhydride grafted styrene-butadiene-styrene copolymer, aminated calcium carbonate, modified glass fiber, an antioxidant and a lubricant according to a mass ratio of 100: (12-18): (2-5): (1-2): (3-5): (3-7): (6-10): (0.2-0.5): (0.1-0.3), carrying out melt blending, extruding, cooling, granulating, and carrying out extrusion molding to obtain the polypropylene composite material. Through the synergistic effect of the nano calcium carbonate and the glass fibers, the mechanical property of polypropylene is improved, all the raw materials are crosslinked to form a uniform network structure, more energy is absorbed when a matrix is impacted by external force, and it is guaranteed that the filter pressing plate is not damaged when deforming under the high-temperature and high-pressure conditions; the obtained polypropylene composite material is high in strength, good in heat resistance and excellent in comprehensive performance.

The invention discloses a method for improving the high-cycle fatigue performance of a Ti6Al4V titanium alloy, and belongs to the technical field of metal material processing, and the method comprises the following steps: S1, determining shot peening strengthening parameters based on material performance parameters and related standards; according to the method, high-amplitude residual compressive stress is introduced through shot peening strengthening, the stress state of the surface and the depth direction of the material is changed, accordingly, crack extension can be restrained, the fatigue life is prolonged, in addition, a plastic deformation layer is induced to be generated under the surface depth in the shot peening process, the microstructure of the material is improved, and the anti-fatigue performance of the material is improved; through femtosecond laser shock, surface defects can be effectively removed, the surface compactness can be improved, microcracks can be reduced, and a refined grain structure can be generated, so that the strength and toughness of the material are further enhanced, the high-cycle fatigue performance of the material is further improved, the two are combined, the residual stress state is optimized, and the surface integrity is improved. The fatigue performance of the Ti6Al4V titanium alloy is remarkably improved.

The invention discloses an ecological management method for an eroded gully in a high and cold wet steppe area, which comprises the following steps: firstly, cleaning sundries in the eroded gully, and then performing slope cutting treatment on the gully bottom and gully slope of the eroded gully; pine piles or gabion protection feet are arranged at the bottom of a ditch slope of the erosion ditch; gabion check dams and / or raft pile dams are arranged in the extending direction of the channel of the erosion gully at intervals; vegetation is planted on a ditch slope of the erosion ditch, and an ecological intercepting ditch is formed in the top of the ditch slope; the comprehensive protection system is constructed through the measures of the channel stepped gabion check dam, the log raft piles, the channel slope stabilizing structure, the ecological revetment, soil protection, vegetation recovery and the like, extension and expansion of the erosion gabion are prevented, the stable state of the gabion bank is kept, ecological balance is promoted through vegetation recovery, the anti-scouring, stability and ecological function of the erosion gabion bank are enhanced, and the ecological protection effect of the erosion gabion bank is improved. The problems existing in the prior art are solved, and the purpose of long-term effective ecological treatment of the erosion gully is achieved.

The invention relates to the field of carbon-ceramic composite materials, in particular to a chopped carbon fiber reinforced carbon-ceramic composite material and a preparation method thereof.The chopped carbon fiber reinforced carbon-ceramic composite material is prepared from, by weight, 10-60 parts of chopped carbon fibers, 10-60 parts of silicon carbide powder, 10-60 parts of carbon powder, 10-60 parts of phenolic resin and 0.1-10 parts of graphene; the prepared carbon-ceramic composite material has good mechanical properties and excellent wear resistance, the densification process of the material is rapid and does not need to be repeatedly carried out, the time is saved, and the production efficiency is improved.

The invention discloses a method for lateral epitaxial growth of a gallium nitride layer and a gallium nitride structure, and the method comprises the following steps: providing a substrate structure which comprises a substrate and a graphene layer which are stacked; etching the graphene layer to form a first window and a first graphene mask structure which are arranged at an interval; the bottom of the first window is in contact with the upper surface of the substrate, and an oxide mask structure is arranged at the bottom; etching the first graphene mask structure to form a second window to obtain a second graphene mask structure; the bottom of the second window is in contact with the upper surface of the substrate, and the second window is located around the second graphene mask structure; and growing a gallium nitride layer on the substrate at the boundary of the second graphene mask structure in a nucleation manner. According to the invention, GaN is subjected to nucleation growth in the nano-scale second window, dislocation of the substrate is blocked by the oxide mask structure and the second graphene mask structure, and a large amount of dislocation is prevented from extending to the gallium nitride layer, so that the dislocation density is greatly reduced.

The invention belongs to the technical field of polymer composite materials, and particularly relates to a high-strength corrosion-resistant ABS composite flame-retardant material and a preparation method thereof. The ABS composite flame retardant material is prepared from the following raw materials in parts by weight: 60 to 75 parts of acrylonitrile-butadiene-styrene, 10 to 15 parts of glass fiber, 0.5 to 1 part of gamma-aminopropyltriethoxysilane, 8 to 12 parts of phosphorus-nitrogen flame retardant, 1 to 3 parts of nano aluminum oxide, 0.5 to 1 part of potassium perfluorooctane sulfonate, 1 to 3 parts of epoxy modified graphene oxide and 5 to 8 parts of modified nano montmorillonite. Through the synergistic effect of the epoxy silane modified graphene oxide and the long-chain alkylsilane modified nano montmorillonite, the mechanical property, the corrosion resistance and the flame retardant effect of an ABS matrix are remarkably enhanced. The modified material maintains toughness under high strength, effectively avoids embrittlement, and shows excellent impact resistance and environmental protection property.

The invention discloses a thermal deformation neodymium-iron-boron magnet and a preparation method thereof, the component of the thermal deformation neodymium-iron-boron magnet is RaCobBcNidCueTfFebal, R is one or more rare earth elements taking Nd as an essential element, T is selected from one or two of Ti and Zr, a + b + c + d + e + f + bal = 100 (by atomic percent), 13.5 < = a < = 16.5, 0.0 < = b < = 2.0, 5.2 < = c < = 5.6, 0.2 < = d + e < = 3.0, and 0 < = f < = 0.2. In the magnet, non-ferromagnetic grain boundary phases exist on the grain boundaries of the c surface and the ab surface of neodymium iron boron grains.

The invention belongs to the technical field of ultrahigh strength maritime work steel plate production, and particularly relates to an extra-thick specification 460 MPa grade steel plate for ocean engineering and a preparation method thereof.The steel plate comprises, by mass, 0.08%-0.10% of C, 0.20%-0.40% of Si, 1.50%-1.65% of Mn, smaller than or equal to 0.010% of P, smaller than or equal to 0.005% of S, 0.030%-0.040% of Nb, 0.010%-0.020% of Ti, 0.26%-0.35% of Cr, 0.35%-0.45% of Ni, 0.15%-0.25% of Cu and 0.020%-0.050% of Al, Pcm is controlled to be smaller than or equal to 0.22%, and Ceq is controlled to be smaller than or equal to 0.46%. According to the 460MPa-grade ultrahigh-toughness maritime work steel plate, the upper yield strength ReH is larger than or equal to 460MPa, the tensile strength Rm ranges from 540 MPa to 720MPa, the percentage elongation after fracture A is larger than or equal to 17%, the core transverse KV2 at the temperature of minus 60 DEG C is larger than or equal to 150J, the CTOD characteristic value of base metal at the temperature of minus 40 DEG C is larger than or equal to 0.25 mm, and the CTOD characteristic value of a welding heat affected zone at the temperature of minus 20 DEG C is larger than or equal to 0.45 mm after 50kJ / cm heat input submerged-arc welding.

The invention discloses a high-impact polyphenylsulfone composite material and a preparation method thereof, and relates to the technical field of polymer materials. When preparing the high-impact polyphenylsulfone composite material, the present invention reacts 3-mercapto-1,3-propylene glycol and 4-mercaptophenyl boric acid to obtain bis-mercapto borate; reacts 3-mercapto-1-propylamine and 2-pyridine formaldehyde and then reacts with copper acetate to obtain a pyridine Schiff base copper complex; 4,4'-difluorodiphenyl sulfone, decafluorodiphenyl sulfone, biphenyl diphenol, 2,2'-diallyl bisphenol A are polycondensed to obtain functionalized polyphenylsulfone; nano-montmorillonite is sequentially reacted with copper nitrate and allyl triethoxysilane to obtain modified montmorillonite; functionalized polyphenylsulfone, modified montmorillonite, bis-mercapto borate, and pyridine Schiff base copper complex are mixed and then injection molded to obtain a high-impact polyphenylsulfone composite material. The high-impact polyphenylsulfone composite material prepared by the present invention has excellent self-repairing, impact resistance, antibacterial and hydrophobic properties.

The invention relates to the technical field of building materials, and discloses chemical-corrosion-resistant aluminoferrite cement concrete and a preparation method thereof.The molecular structure of sodium alginate is rich in carboxyl, sodium alginate can generate coordination crosslinking with Ca < 2 + > and Al < 3 + > in blast furnace slag to form hydrogel of a three-dimensional structure, the hydrogel and an original covalent network form a compact dual-network structure, and the chemical-corrosion-resistant aluminoferrite cement concrete is prepared. External ions are not easy to diffuse, and the corrosion resistance of the concrete is enhanced; the organic silicon fluorine epoxy modified acrylic emulsion can form a waterproof layer on the surface of the concrete to prevent erosion factors from entering in a physical barrier manner, so that the corrosion resistance of the concrete is further improved; the cross-linking density of the whole mixed network is also increased through interpenetration and interpenetration of the organic hydrogel and the inorganic filler, the mechanical strength and the anti-permeability performance of the concrete material are further improved through inner doping and outer coating processes, and the concrete material is low in cost, environmentally friendly and easy to industrially produce.

The invention provides a high-entropy ceramic nano composite structure coating as well as a preparation method and application thereof, and belongs to the technical field of hard protective coatings. The high-entropy ceramic nano-composite structure coating provided by the invention comprises a plurality of structural units which are laminated on the surface of a substrate, wherein each structural unit comprises a template layer and a modulation layer arranged on the upper surface of the template layer; the template layer is in contact with the substrate; the template layer is made of a nitrogen-doped TiAlCrZrWV alloy material, and the modulation layer is made of a nitrogen-doped carbon material. According to the high-entropy ceramic nano-composite structure coating and the preparation method thereof, the template layer is high in hardness and elasticity modulus, the modulation layer has good tribological performance, when the modulation layer is inserted into the middle of the template layer, on one hand, improvement of friction performance is promoted, on the other hand, the toughness and hardness of the high-entropy ceramic nano-composite structure coating are improved, and balance between the brittleness and abrasion resistance of the coating is achieved.

The invention relates to the technical field of high polymer materials, and discloses composite non-woven cloth based on polyethylene and a preparation method thereof.The composite non-woven cloth is prepared from ultra-high molecular weight polyethylene fibers as a base material through hot pressing with an adhesive, and the adhesive is prepared from epoxy resin, a functional composite additive, a defoaming agent and a curing agent; the functional composite additive is added into the adhesive, so that the density and cohesion of the adhesive can be effectively enhanced, the binding force of the adhesive and ultra-high molecular weight polyethylene fibers is improved, the impact resistance of the composite non-woven fabric is further improved, and the situation that the service life of the non-woven fabric is shortened due to tearing caused by debonding and slippage of the fibers when the composite non-woven fabric is impacted is avoided; meanwhile, the heat resistance and the flame retardance of the adhesive can be improved, so that the safety and the reliability of the composite non-woven cloth are improved, the application range of the composite non-woven cloth is widened, and the application prospect is wide.

The invention relates to a hydrogen fuel cell stainless steel bipolar plate surface composite coating and a preparation method thereof. The composite coating comprises a metal Cr transition layer, a CrN bottom layer, a metal Cr middle layer and a CrN surface layer which are sequentially arranged on a stainless steel bipolar plate. A metal Cr transition layer, a CrN bottom layer, a metal Cr middle layer and a CrN surface layer are sequentially deposited on a stainless steel bipolar plate through a physical vapor deposition method. Compared with the prior art, the corrosion-resistant and conductive coating for the stainless steel bipolar plate of the hydrogen fuel cell, provided by the invention, can solve the problems of poor corrosion resistance, insufficient conductivity and the like of the stainless steel bipolar plate in an acid environment of the hydrogen fuel cell.

The invention discloses a preparation method of low-temperature sintered ceramic. The preparation method comprises the following steps: S1, pretreating kaolin; s2, modifying kaolin; s3, preparing a ceramic green body; s4, preparing a glaze material; and S5, preparing the low-temperature sintered ceramic. According to the low-temperature sintered ceramic provided by the invention, the kaolin is pretreated and modified, and the special grinding aid is added in the preparation process of the ceramic green body, so that the sintering temperature of the ceramic is effectively reduced, the sintering process is optimized, low-temperature sintering of the ceramic is realized, the energy consumption is reduced, and the production efficiency is also improved; the method has remarkable economic benefits and environmental protection significance, and the prepared ceramic has good mechanical properties.

The invention relates to quick-drying green low-carbon waterproof mortar for repairing gaps of outdoor doors and windows and a preparation method of the quick-drying green low-carbon waterproof mortar, and belongs to the technical field of building materials. The sulphoaluminate cement and the silicon powder are subjected to modification treatment, the boron-containing silane water repellent is used, and by means of the synergistic effect of the components, the combustion performance grade of the waterproof mortar is effectively improved, the compressive strength is improved, and meanwhile the low heat conductivity coefficient is kept.

The invention relates to high-strength honeycomb activated carbon and a preparation method thereof, and belongs to the technical field of activated carbon. The preparation method of the high-strength honeycomb activated carbon comprises the following steps: (1) crushing rice hulls, performing ultrasonic cleaning, drying, and performing pre-carbonization treatment to obtain a pre-carbonized product; (2) dipping the pre-carbonized product in a pretreated phosphoric acid solution, and activating to obtain an activated product; (3) dipping the activated product in a binder, stirring and carbonizing to obtain a carbonized product; and (4) mixing the carbonized product, basalt fiber and deionized water, pugging, pouring into a mold, carrying out extrusion molding, and drying to obtain the high-strength honeycomb activated carbon. According to the honeycomb activated carbon prepared by the preparation method disclosed by the invention, activated carbon particles are firmly combined together through earlier-stage treatment and introduction of the binder and the basalt fibers, so that the overall strength of the honeycomb activated carbon is effectively improved.

The invention discloses a cement-free Al2O3-SiC-C refractory castable and a use method of the cement-free Al2O3-SiC-C refractory castable. The invention relates to the technical field of refractory castable. The refractory castable is composed of aggregate, a matrix material and a water reducing agent. The aggregate is corundum particles and silicon carbide particles. The matrix material comprises corundum fine powder, alpha-Al2O3 micro powder, silicon micro powder, silicon carbide fine powder, ball pitch and various metal microcapsules. The use method of the refractory castable comprises the following steps: uniformly mixing the water reducing agent and the matrix material to obtain a premixed matrix material; uniformly stirring the aggregate and the premixed matrix material, adding water, and stirring to obtain slurry; pouring the slurry into a mold, and performing vibration molding and maintenance. The refractory castable disclosed by the invention is high in normal-temperature strength, excellent in medium-temperature and high-temperature mechanical properties, good in erosion resistance and thermal shock resistance, long in service life, energy-saving and environment-friendly; and in the using process, water adding amount is small, fluidity is good, production is stable, and the agent is suitable for molten iron grooves, ladle working layers and other parts.

The invention discloses a preparation method of a heat-insulation reinforcing material for mine roadway guniting support. The preparation method comprises the following steps: crushing cotton straws, sieving, and drying until the mass is constant; the preparation method comprises the following steps: preparing an alkali activator solution formed by mixing NaOH and Na2SiO3; mixing and stirring slag powder and fly ash to obtain a slag-ash mixture; then carrying out solid-liquid mixing on the slag-ash mixture and an alkali activator solution, and adding 2-5% of quartz sand; after stirring, sequentially adding 20 to 28 percent of cotton straw, 0.35 to 0.45 percent of aluminum powder foaming agent and a proper amount of foam stabilizer; the water-cement ratio of the thermal insulation reinforcing material is (0.4-0.6): 1. The thermal insulation reinforcing material is used for shotcrete support of the mine laneway. According to the invention, light materials such as cotton straws are added, so that the guniting support material has better heat preservation and heat insulation effects. The cotton straw can also effectively prevent the expansion of internal cracks, and can better improve the strength and toughness of the material.

The invention relates to the technical field of coatings, and discloses a preparation method of an environment-friendly wear-resistant water-based coating, which comprises the following steps: adding water-based epoxy resin, modified polyester fiber, a defoaming agent, a thickening agent, a pigment filler and a dispersing agent into water, and shearing and dispersing through a high-speed dispersion machine to obtain the environment-friendly wear-resistant water-based coating. According to the preparation method, the polyester fiber is subjected to ultraviolet radiation grafting modification by using the styryl sulfoacid imine monomer, and a large number of hydrophilic sulfonate groups and active imino groups are introduced to the surface of the fiber, so that the dispersity of the polyester fiber in a water-borne epoxy resin coating is improved, and the wear resistance and the hardness are improved. Active imino groups on the surface of the modified polyester fiber can be subjected to a curing reaction with epoxy resin, so that the interface bonding force between the polyester fiber and the epoxy resin is enhanced, a very good toughening effect is achieved, and the tensile strength, the elongation at break and the impact strength of the epoxy resin are improved.

The utility model discloses an ultra-high-performance cement-based thin overlay anti-crack structure which comprises a thin overlay additionally laid on an old cement concrete pavement, and the thin overlay is made of ultra-high-performance concrete. The crack isolating layer is paved on the pavement crack in advance and is positioned below the thin overlay; uHPC (Ultra-High Performance Concrete) and crack isolation are adopted as an anti-crack structure of a thin overlay, and the pavement slotting (slotting along the full length or local part of the crack) or / and the crack isolation layer are / is adopted to adapt to the shrinkage and expansion of the concrete, so that the expansion of the reflection crack is prevented, and the anti-crack performance of the thin overlay is improved. And meanwhile, pavement slotting is beneficial to avoiding buckling instability damage of the UHPC thin overlay and bonding failure of an interlayer interface caused by expansion of adjacent plates at the cracking part of the old pavement. By means of the structure, the thin overlay has good stability, crack resistance and durability, and the problems of buckling and disengaging of the thin overlay and early fracture, fatigue failure and the like under the heavy load effect can be effectively solved.

The utility model discloses a self-adhesive agricultural mulching film, which relates to the technical field of agricultural mulching films, and comprises a middle film, two sides of the middle film are fixedly connected with side films, the mulching film is in cohesive connection with ground soil through a cohesive layer at the bottom of a cohesive weed suppression layer, and the design of ensuring the cohesive gradient ensures that the cohesive of a central area is larger. After the sticky protrusions are combined with the soil, the laying efficiency of workers is improved, fixing through U-shaped nails is not needed, physical loss is reduced, the labor intensity of the workers is reduced, the sticky strength of the edges is small, film uncovering is facilitated, the film uncovering speed is increased, and the waste film recycling speed is increased. A plurality of groups of dividing holes are arranged in sequence to realize temperature adjustment and promote plant growth, the directional flow guide grooves adopt the design of V-shaped grooves, namely the design of inclination angles, so that the rainwater diversion efficiency is improved, drainage can be helped, and waterlogging damage to roots can be effectively prevented; and the problem that the mulching film is lifted due to overlarge wind force is effectively prevented.

The application discloses a gradient cemented carbide with solid solution change distribution and a preparation method thereof. The gradient cemented carbide comprises a poor-FCC high-toughness area, a rich-FCC high-hardness area and a core area from outside to inside. The thickness of the poor-FCC high-toughness area is denoted as L1, the thickness of the rich-FCC high-hardness area is denoted as L2, the ratio of L2 to L1 is 1.1-5:1, and the ratio of the EBSD calibration area of the rich-FCC high-hardness area to the core area is 1.1-3:1. The preparation method comprises preparing raw materials according to the elements and proportions of the gradient cemented carbide, pressing forming and alloy sintering. The gradient cemented carbide can realize the double high characteristics of the high-toughness surface layer and the high-hardness subsurface layer at the same time without changing the alloy matrix component system and the hard phase particle size system, thereby significantly improving the high-temperature plastic deformation resistance of the cutter.

The utility model discloses a root-resistant waterproof basement roof landscape planting roof structure which comprises a structural layer, a supporting frame is placed at the upper end of a filtering layer, the interior and the exterior of the supporting frame are filled with vegetation soil layers, the inner wall of the supporting frame is fixedly connected with a threaded installation groove, and a planting bin is installed on the inner wall of the threaded installation groove in an inserted mode. According to the root-puncture-resistant waterproof basement roof landscape planting roof structure, the planting pool can be reinforced and mounted through the reinforcing blocks and the cement mounting layer, the planting pool is an integrally-formed steel mechanism and is good in stability, the vegetation soil layer can be supported through the supporting frame, soil is prevented from being too compact, growth is not affected, and the service life of the planting pool is prolonged. Cultivation can be facilitated through the planting bin, root extension can be effectively prevented through the planting bin and the supporting frame, the planting bin can be rapidly and independently disassembled and assembled through the threaded mounting groove, the root puncture resistant waterproof roll is conveniently and stably adhered through the adhesion fixing block, replacement and use are convenient, and the use effect is good.

The present application relates to the technical field of road engineering, and particularly relates to a bridge-head cover plate combined fiber anti-cracking flexible splicing structure and a preparation method thereof, which comprises a base layer with an asphalt pavement part on the top and an abutment; the base layer, the abutment and the asphalt pavement part form a groove, the side wall of the groove is formed by the asphalt pavement part, the bottom wall of the groove is formed by the base layer and the abutment; the inner wall of the groove is coated with a two-component high-viscosity high-elasticity interface adhesive; from bottom to top, the groove is sequentially filled with a high polymer elastic body and a reinforced anti-cracking asphalt mixture; a basalt fiber bar anchoring member is pre-buried in the inner wall of the groove, and the high polymer elastic body and the reinforced anti-cracking asphalt mixture wrap the basalt fiber bar anchoring member; through the stress diffusion of the interface adhesive layer, the deformation buffer of the flexible bottom layer and the anti-cracking cooperation of the rigid surface layer, the road surface longitudinal slope mutation caused by the differential settlement of the abutment and the base layer is effectively relieved, the vehicle jumping impact force is reduced, the road surface longitudinal corner is reduced, and the driving smoothness and the structural durability are significantly improved.

A water-reducing agent for coal-based solid waste concrete and its preparation method are disclosed. The water-reducing agent comprises 40-60 parts of a polycarboxylate-based main agent, 15-25 parts of a slump retainer, 10-20 parts of a crack-resistant reinforcing agent, 5-10 parts of a dispersing agent, 2-5 parts of a stabilizer, and 10-20 parts of deionized water. The slump retainer is a modified polyetheramine prepared by block copolymerization of ethylenediamine with ethylene oxide and propylene oxide; the crack-resistant reinforcing agent is a composite of nano-calcium carbonate and modified lignin sulfonate. This invention reduces the adsorption loss of the water-reducing agent by coal-based solid waste particles through the synergistic effect of the polycarboxylate-based main agent and the modified polyetheramine slump retainer, achieving a slump loss rate of ≤15% after 2 hours. The nano-calcium carbonate fills interfacial voids, and the modified lignin sulfonate alleviates hydration thermal stress, resulting in a lower 28-day drying shrinkage rate and higher crack resistance of the concrete. This invention solves the problems of poor adaptability, short slump retention time, and insufficient crack resistance of traditional water-reducing agents in high-volume coal-based solid waste concrete.

The present application provides a display panel and a display device, wherein the display panel has a display area and a non-display area, wherein the non-display area includes a first frame area and a second frame area; the display panel includes: a substrate, a power signal line and a drive signal line; a metal shielding layer, which is arranged in the substrate substrate, and covers the orthographic projection of the drive signal line on the substrate substrate; the metal shielding layer at least partially surrounds the display area in the second frame area, and at least partially is electrically connected to the power signal line in the first frame area; the present application can enhance the toughness of the periphery of the display panel by setting the metal shielding layer, and prevent cracks from extending toward the display area; at the same time, the metal shielding layer can shield the drive signal line in the second frame area, and is electrically connected to the power signal line to form a shielding electric field, thereby reducing the influence of light on the performance of the drive signal line, and can also shield the charge inside the display panel, which is beneficial to ensuring the product quality and performance of the display panel.

The utility model discloses a mold device capable of exhausting smoke under negative pressure, which comprises a mold assembly, a mold assembly, a mold cover, a mold cover, a mold cover and a mold cover, the mold assembly comprises an upper mold, a lower mold and a sand core positioned between the upper mold and the lower mold, a cavity is formed among the upper mold, the lower mold and the sand core, and the cavity is filled with metal liquid to form a required casting, a smoke exhaust channel is arranged on one horizontal side of the lower mold or the upper mold, and the cavity is communicated with the outside through the smoke exhaust channel; the smoke exhaust assembly comprises a negative pressure pipe extending in the horizontal direction, a ventilation pipe located in the negative pressure pipe and air supply equipment used for supplying air to the ventilation pipe, one end of the negative pressure pipe is connected with the smoke exhaust channel, the ventilation pipe extends along the negative pressure pipe, an air outlet of the ventilation pipe is arranged back to the smoke exhaust channel, and the air supply equipment is used for supplying air to the ventilation pipe. A negative pressure channel is formed between the ventilation pipe and the negative pressure pipe, and the ventilation pipe conducts ventilation so that smoke can flow to the negative pressure channel from the smoke exhaust channel. According to the utility model, the flue gas can be quickly discharged, and the product yield is improved.

The present application relates to the technical field of optical transmission network equipment, and in particular to an OTN device. It comprises a cabinet, wherein a plurality of OTN transmission equipment bodies are vertically spaced apart in the cabinet, a groove is provided on the bottom wall of the installation cavity, and a plurality of rows of through holes are evenly distributed on the bottom wall of the groove, an air channel is provided on the side wall at the bottom wall of the installation cavity, a gas plate is embedded in the groove, and air holes are provided on the gas plate, a stud is abutted against the end of the OTN transmission equipment body, a lever that is rotatably mounted on the side wall of the cabinet and is axially slidably matched with the stud, a driving rod is hung on the end of the lever, and a pressure plate is provided on the side wall of the driving rod. When the temperature rises too high, the crystal head is separated from the OTN transmission equipment body to prevent problems such as short circuit from affecting other devices electrically connected to it along the line; at the same time, the gas plate is offset, and the air channel and through hole are no longer connected with the air hole, thereby isolating the installation cavity from the adjacent installation cavity, and preventing the fire and other accidents of the OTN transmission equipment body in the installation cavity from extending to the remaining OTN transmission equipment bodies or other devices.

The utility model relates to the technical field of sputum aspirators, and discloses a disposable electric sputum aspirator which comprises a shell and a connecting cylinder, the connecting cylinder is fixedly connected to the side wall of the shell, the inner wall of the shell is provided with a cavity, the inner wall of the connecting cylinder is fixedly connected with an adjusting box, the side wall of the adjusting box is fixedly connected with a connecting pipe, and the connecting pipe is fixedly connected with the shell. A sputum storage tank is fixedly connected to the bottom pipe wall of the connecting pipe, a hose is fixedly connected to the pipe wall of the end, away from the adjusting box, of the connecting pipe, and magnetic rings are fixedly connected to the inner walls of the two sides, located in the cavity, of the shell. The electromagnet slides towards the right side, so that the shell is located in the cavity to generate negative pressure, meanwhile, the transmission rod is pulled to move, the transmission rod pulls the partition plate open, the interior of the adjusting box can be affected by the negative pressure, located in the cavity, of the shell, and gas in the hose flows into the adjusting box through the connecting pipe; and the sputum of the patient is extracted by the hose.