101results 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 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 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 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 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 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 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.

A compact-structure pin assembly with a plugging position retracted comprises a support arranged in a conversion socket and a pin unit connected to the support in a sliding mode, the pin unit comprises at least a first pin assembly, a second pin assembly and a third pin assembly which are arranged side by side, and the support comprises a bottom plate. The support is further provided with two pieces of conductive hardware corresponding to the L pole and the N pole respectively. Each of the first pin assembly, the second pin assembly and the third pin assembly comprises a sliding part, a pin and a plug connector, and the conductive hardware is further provided with a plug-in position in mutual plug-in connection with the plug connector; and the plugging positions are positioned in the orthographic projection range of the two sliding parts at the two ends of the pin unit towards the bottom plate. According to the technical scheme, the overall size of the conversion socket can be effectively reduced, and the conversion socket can be miniaturized and portable.

The present application relates to the technical field of silicone rubber material, in particular to a sericite modified silicone rubber material and a preparation method thereof.The present application overcomes the problems of poor dispersion of sericite in the organic silicon matrix and poor compatibility of fluorosilicon and common silicon.The silicone rubber material is prepared from polysiloxane hybrid base glue prepared by in-situ polymerization of fluorine-containing / ethenyl double modified sericite, fluorosilicon raw rubber, methylphenylvinyl silicone rubber, MQ silicone resin, hydrogen-containing silicone oil and vulcanizing agent;the preparation process involves double functional group grafting on the surface of sericite, monomer in-situ ring-opening polymerization coating, multiphase blending to build interpenetrating network and hydrogen-containing silicone oil chain extension to cooperate with gradient vulcanization, through building a rigid-flexible stereo enhanced network, the material is endowed with excellent oil resistance, heat resistance and high mechanical strength, and can be used in the field of automobile manufacturing.

The invention relates to a pole-mounted single-phase transformer, and relates to the technical field of intelligent power grids, the pole-mounted single-phase transformer comprises a cylindrical main body, and the cylindrical main body is provided with a low-voltage bushing and a high-voltage bushing; a plurality of supporting frames are fixedly arranged on the peripheral face, away from the low-voltage sleeve, of the cylindrical body, connecting plates are rotationally installed on the outer edges of the top face and the bottom face of the cylindrical body, and protection plates are vertically and fixedly arranged on the side face edges, away from the cylindrical body, of the connecting plates. The two connecting plates can rotate back to back to a mounting state parallel to the axis of the cylindrical main body and are fixed when equipment is mounted and applied, and the protective plates rotate to a protective state parallel to the end surface of the cylindrical main body at the same time; a scraping plate is rotationally mounted on the side face, away from the protective plate, of the connecting plate, and a driving part for driving the scraping plate to rotate is fixedly arranged on the side face, facing the protective plate, of the connecting plate; the driving piece drives the scraper to rotate, the scraper can specifically clean plants attached to the outer side face of the connecting plate, and the plants are prevented from further extending to cover the equipment.

The invention relates to the technical field of robots, in particular to a speed reducer, a joint module and a robot, and solves the problem that the speed reducer cannot give consideration to both the reduction ratio and the size. The speed reducer comprises a sun gear, a plurality of compound planet gears, an inner gear ring and a planet carrier. Due to the fact that the compound planet gear comprises the first sector gear and the second sector gear which are coaxially connected, the first sector gear is externally meshed with the outer ring of the sun gear, the compound planet gear has speed ratio level difference, and therefore the reduction ratio of the speed reducer is guaranteed. Due to the fact that the projection of the first sector gear on the end face of the inner gear ring is located on the inner side of the inner ring of the inner gear ring, the first sector gear is prevented from extending to the outer side of the inner ring of the inner gear ring, and the radial size of the speed reducer is reduced. Namely, the reduction ratio of the speed reducer is ensured, and meanwhile, the radial size of the speed reducer is reduced, so that the torque density of the speed reducer is increased.

The invention discloses a preparation method of a wear-resistant and stretch-resistant biaxial fiber fabric, belongs to the technical field of fiber fabric processing, and is used for solving the technical problem that the wear resistance and stretch resistance of the biaxial fiber fabric in the prior art need to be further improved. Then weaving, coating the surface, and finally curing and drying to obtain the wear-resistant stretch-resistant biaxial fiber fabric. The modified fiber disclosed by the invention is subjected to surface epoxy grafting modification, so that the wear resistance of the modified fiber is kept, the compatibility with other components is improved, and a wear-resistant basic framework is provided for a fabric; the modified coating agent forms a cross-linked network with the curing agent through the polyester polyol, a high-hardness wear-resistant coating is formed on the surface of the fabric in combination with the reinforcing effect of the modified filler, and the wear-resistant and tensile properties of the fabric are jointly improved through chemical compatibility and structural synergy of the polyester polyol and the curing agent.

The invention discloses an epoxy resin anti-collision, anti-corrosion and wear-resistant material and a preparation method thereof, and the invention relates to the technical field of epoxy resin materials, comprising the following components in parts by weight: 2.5-4 parts of anti-corrosion filler, 1.8-2.5 parts of wear-resistant filler, 25-30 parts of epoxy resin, 10-15 parts of diluent, 1.5-2 parts of defoamer, and 1.5-2 parts of toughening agent; the diluent is a mixed solution of xylene and n-butanol in a volume ratio of 1:2. The epoxy resin anti-collision, anti-corrosion and wear-resistant material and a preparation method thereof, because graphene oxide itself has a two-dimensional flaky structure, bears a certain load in the epoxy resin matrix, disperses stress, and at the same time, modified zirconium oxide particles have higher hardness and strength, and the two act synergistically, so that the modified zirconium oxide fills the gap between the graphene oxide sheets, making the internal structure of the material more compact, reducing the penetration channel of corrosive substances, thereby improving the anti-corrosion performance of the epoxy resin.

The present application relates to the field of film processing technology, and specifically discloses a high-strength film and a preparation method thereof. A high-strength film, the raw materials of the film include: functionalized graphene oxide nanosheets; silicate nanofibers; polycarbonate polyols; silane coupling agents; isocyanate crosslinking agents; chain extenders; antioxidants and lubricants; the functionalized graphene oxide nanosheets are obtained by grafting bromine atoms on the surface of graphene oxide. The high-strength film of the present application can be used in special occasions such as aerospace, high-speed train windows, and high-end smartphone screens that need to withstand large external forces or require high durability, and it has the advantages of high strength and high durability.

The invention provides a steel cushion beam for caisson water bag-hydraulic trolley conversion docking and a docking construction process thereof, and relates to the technical field of gravity type caisson wharf caisson docking, in particular to the steel cushion beam for caisson water bag-hydraulic trolley conversion docking and the docking construction process thereof. Comprising lower supporting profile steel and upper supporting profile steel which are vertically welded to form integral supporting profile steel, and the two sides of the integral supporting profile steel are symmetrically arranged; a docking track matched with a track wheel at the bottom of the hydraulic trolley is arranged at the upper end of the upper supporting profile steel, and the docking track is fastened to the upper portion of the upper supporting profile steel through a track pressing plate; the bottom of the lower supporting profile steel is placed on the upper portions of the water bag trolley steel rails and fixed between the two water bag trolley rails through a limiting plate. The total height of the docking track, the lower supporting profile steel, the upper supporting profile steel and the hydraulic trolley is consistent with the height of the water bag trolley. The method has the positive effects of reducing the reconstruction work amount of a prefabrication yard, and realizing high efficiency, safety and low cost.

The invention relates to the technical field of fire extinguishers, in particular to a fire extinguishing auxiliary device and a control system thereof. According to the technical scheme, the fire extinguisher comprises a top plate and a protective cover connected to the bottom end of the top plate, a fire extinguisher body is installed in the protective cover, a steering control mechanism used for adjusting the direction of the fire extinguisher body is arranged in a control groove, and a smoke sensing part used for controlling the steering control mechanism to be started directionally is arranged at the bottom end of the fire extinguisher body. The steering control mechanism is installed in the control groove, the smoke sensing part is arranged at the spraying end of the fire extinguisher, the spraying direction of the fire extinguisher can be accurately controlled according to the specific direction of an ignition point, the fire extinguishing accuracy is guaranteed when a fire occurs, and fire extension is effectively prevented; the pneumatic pressing piece is arranged in the control groove, so that the guide cover extends downwards to cover the spraying end of the fire extinguisher, the guide spraying effect on dry powder is achieved in the fire extinguishing process, the fire extinguishing effect is guaranteed, and the nearby visibility is not affected.

The application discloses a kind of high fire endurance closed-cell foam ceramic material and its preparation method, and the weight percentage of the ceramic material raw material formula is as follows: white ceramic tailings 20-40%, tea crystal stone 15-30%, burned soil 5-15%, high-alumina sand 5-10%, desert sand 15-25%, light-burned magnesium 5-15%, plus foaming agent 0.1-3%.According to the weight percentage of the ceramic material raw material formula, normal foam ceramic A material, high-density foam ceramic B material or low-density foam ceramic C material is configured respectively, and the closed-cell foam ceramic material is obtained by ball milling, spray granulation, mixing and loading box sintering.The technical scheme of the application not only has simple process, low cost and superior performance, but also improves the fire endurance of the material, meets the use requirements of wall materials, widens the application field of closed-cell foam ceramic, and has broad market prospect.

The application provides a kind of high efficiency DC-DC power module of power saving type for tractor, it is related to power module technical field, including substrate, DC-DC power module, top plate, air-cooled heat sink and at least one heat conducting piece.The application, by setting heat conducting piece between the heat generating element of DC-DC power module and top plate, the equivalent thermal conductivity of the heat conducting piece from first end (heat source end) to second end (top plate end) shows decreasing trend;It is realized that the equivalent thermal conductivity is high near the heat generating element, the heat can be quickly exported from heat source, avoid heat accumulation to cause element junction temperature too high;With the heat transfer along the heat conducting piece to top plate direction, the equivalent thermal conductivity gradually reduces, and the heat flow transmission capacity weakens, to make heat more dissipate through the side wall of heat conducting piece to the surrounding environment (especially the airflow driven by air-cooled heat sink).

The invention provides a silicon-carbon composite material as well as an appearance evaluation standard and application thereof, and relates to the technical field of battery negative electrode materials. The silicon-carbon composite material comprises sphere-like silicon-carbon particles, and each sphere-like silicon-carbon particle comprises a silicon-carbon plane and a silicon-carbon transition cambered surface adjacent to the silicon-carbon plane; and the minimum value of the curvature of the cambered surface infinitesimal element of the silicon-carbon transition cambered surface at the joint of the silicon-carbon transition cambered surface and the silicon-carbon plane is 0. The material is of a sphere-like structure containing a plane and an adjacent transition cambered surface, the structure and a base body can form three-dimensional interlocking, mechanical binding force is enhanced, interface crack propagation is restrained, particles can be promoted to be directionally arranged to form regular and uniform slit-shaped channels / pores, the compression resistance and abrasion resistance of the material are improved, the stacking density is increased, and the contact area is increased. And the silicon-carbon composite material has excellent electrochemical performance. The shape evaluation standard represented by the polyhedron degree Q (0-1, the closer to 1, the closer to an ideal polyhedron) is provided, the problem that the shape of an existing polyhedral material lacks a unified evaluation standard is solved, a scheme is provided for similar polyhedral material evaluation, and material design, screening and application are promoted.

This invention discloses a method for preparing abrasive wheel mesh that can improve the strength of a coating. S1: Fabrication of fiberglass cloth; S2: Fabrication of adhesive, using the following materials: 60-100 parts of thermoplastic phenolic resin solid, 6-10 parts of curing agent, 5-8 parts of defoamer, 5-8 parts of reinforcing filler, 30-50 parts of thermosetting phenolic resin liquid, 0.5-2 parts of coupling agent, and 80-140 parts of alcohol; S3: Coating; S4: Coating. This invention adds a curing agent and a reinforcing filler to the adhesive. The addition of both reduces the coefficient of thermal expansion and curing shrinkage of the cured material, thus reducing internal stress. When cracks appear under overload, the filler-containing adhesive layer can prevent crack propagation, thereby improving the bonding strength. Simultaneously, by strictly controlling the coating amount and the relative humidity of the coating during the coating process, the bonding strength and coating strength are further improved.