59results about How to "Solve the strength problem" patented technology

The invention discloses a high-resilience eTPU foaming material and a preparation process thereof, and belongs to the technical field of foaming materials. The process comprises the steps of raw material premixing and TPU chain extension reaction, precursor system injection, in-situ phase change energy storage core-shell particle generation, supercritical two-fluid foaming and molding post-treatment. Wherein the SiO2-coated TiO2 core-shell particles are prepared by a non-hydrolytic sol-gel method, the porous SiO2 core adsorbs and fixes the micro-crosslinked polyurethane-based phase change material, the TiO2 shell provides sealing and supporting, the particles are combined with the TPU matrix through covalent bonds, and the micro-crosslinked polyurethane-based phase change material has a unique micro-crosslinked network structure, so that the thermal conductivity of the TPU matrix is improved, and the thermal conductivity of the TPU matrix is improved. The hidden danger of leakage of the phase change material in the using process can be effectively eliminated, and meanwhile the interface bonding effect between the inorganic particles and the TPU matrix is synchronously enhanced. The eTPU foaming material prepared by the invention has the characteristics of high resilience, strong interface bonding, excellent energy storage stability and low compression set, and is suitable for shoe materials, automotive interiors and other scenes.

The invention belongs to the technical field of freight unmanned aerial vehicle delivery, and relates to an intelligent cabin door system for an unmanned aerial vehicle and a cabin door structure design method. The system comprises a driving system, a reel system, a curtain plate system, a sliding rail unit and a control unit. The control unit is electrically connected with the driving system; the driving system is arranged on the unmanned aerial vehicle body; the curtain plate system is connected with an unmanned aerial vehicle body through the sliding rail unit, the curtain plate system is connected with the reel system, the driving system is in transmission connection with the reel system through a chain wheel transmission structure, and the driving system drives the reel system to rotate so as to drive the curtain plate system to stretch or retract along the sliding rail unit. Opening and closing of the cabin door are realized. According to the invention, the number of moving parts is greatly reduced, the probability of clamping stagnation and wear failure of a mechanical transmission mechanism is fundamentally reduced, and the operation reliability of a cabin door system in harsh operation scenes such as emergency logistics and disaster rescue is remarkably improved.

The invention relates to a glass-based photoelectric volume pulse wave cover plate material as well as a preparation method and application thereof. The cover plate material comprises: a glass substrate; the annular structural part is embedded in the glass substrate; the annular structural member and the glass substrate are made of the same material; the glass substrate comprises the following components in percentage by mass: 0.1 wt%-0.2 wt% of BaO; 0.1 wt% to 0.6 wt% of PbO; 0.1 wt% to 0.7 wt% of Sb2O3; 25 wt%-61 wt% of SiO2; 16 wt% to 18 wt% of B2O3; 10 wt% to 15 wt% of Al2O3; 8 wt% to 12 wt% of R2O; wherein R2O is composed of Li2O, Na2O and K2O, and the content of K2O is smaller than that of Na2O. The technical problem to be solved is to provide the cover plate material with a large number of sensor optical channels, so that the cover plate material has high transmittance and high crosstalk resistance, a plurality of optical paths can be formed in the cover plate material, and the problems of scattering and the like in the light propagation process are reduced by selecting single glass with a specific formula, so that the light transmission efficiency is improved. The energy loss in the light ray propagation process is reduced, and the propagation distance of the light rays in the glass cover plate is increased; meanwhile, the glass cover plate also has higher mechanical strength.

This utility model discloses a spiral-grooved vibration-damping tapered shank cutting tool, relating to the technical field of BT-type tapered shank cutting tools. Specifically, it is a spiral-grooved vibration-damping tapered shank cutting tool, comprising a flange and a BT-type tapered shank. The surface of the BT-type tapered shank is provided with spiral grooves, which are filled with elastic damping material. This spiral-grooved vibration-damping tapered shank cutting tool, by designing spiral grooves in the BT-type tapered shank and filling them with elastic damping material, utilizes the multi-head spiral structure of the spiral grooves to disperse vibration energy in multiple directions. At the same time, the elastic damping material absorbs high-frequency vibrations through shear deformation. This "rigid-flexible composite" structural design solves the contradiction between vibration suppression and structural strength in BT-type tapered shank cutting tools, and also provides high structural reliability without affecting the original strength of the BT-type tapered shank. It offers a BT-type tapered shank cutting tool that combines high rigidity, good vibration reduction performance, and low manufacturing cost.

The application belongs to the chip packaging technical field, and particularly relates to a running control method based on a heterogeneous optoelectronic chip, steps of which are as follows: S101, obtaining a task quantity of a to-be-calculated task; and judging whether the task quantity is greater than a set first calculation threshold; when the judgment result of step S101 is yes, then step S102 is executed, that is, a type one photonic chip is recommended for the to-be-calculated task to execute calculation; when the judgment result of step S101 is no, then step S103 is executed, that is, a recommended calculation time consumption of the to-be-calculated task is obtained, and whether the recommended calculation time consumption of the to-be-calculated task is less than a set time length is judged; when the judgment result of step S103 is yes, then step S104 is executed, that is, a type two photonic chip is recommended for the to-be-calculated task to execute calculation; when the judgment result of step S103 is no, then step S102 is executed. The control method can realize flexible switching and stable high-speed running of the optoelectronic chip in an extreme environment.

The application provides a 1700MPa-grade hot forming steel with high cold bending performance and a preparation method and application thereof. A surface layer of the hot forming steel has soft ferrite structure, a subsurface layer has mixed structure of soft ferrite and martensite, and a core layer has carbon-poor martensite structure. The preparation method comprises any one or a combination of at least two of the following conditions: (A) the coiling temperature after hot rolling is 650-700 DEG C; (B) the pickling speed is less than or equal to 150 m / min; (C) the temperature of continuous annealing is 780-830 DEG C; (D) the atmosphere in the furnace is a mixture of nitrogen and hydrogen; (E) the dew point temperature is-35 DEG C to-17 DEG C. Through fine component design and process integration, the application successfully solves the contradiction between material strength and toughness, realizes double guarantee of high strength and high toughness, simultaneously meets the light weight requirement, and improves the competitiveness of existing products.

The invention discloses a four-door two-cover flexible trimming die switching system, and relates to the technical field of automobile manufacturing equipment.The four-door two-cover flexible trimming die switching system comprises a lightweight trimming die unit and a switching mounting base, and the lightweight trimming die unit is detachably mounted on the switching mounting base through a robot grabbing device; the bottom of the light-weight edge rolling die unit is provided with a gun changing disc butt joint part, and the switching installation base is provided with an electric quick-plug device and a positioning locking device which are matched with the gun changing disc butt joint part. According to the invention, a split type framework of the lightweight trimming die unit and the switching mounting base is adopted, and a full-automatic die switching system is constructed through a robot automatic grabbing and gun changing disc rapid butt joint technology. A gun replacing disc butt joint part arranged at the bottom of the die body, an electric quick-plug device of the base and a positioning locking device form a standard interface, and a robot is matched for accurate grabbing and positioning, so that the die replacing process is optimized from traditional manual hoisting calibration to machine autonomous recognition butt joint.

The invention relates to the technical field of manufacturing of metal composite materials, and discloses a corrosion-resistant and wear-resistant bimetal composite cylinder liner which is prepared through the following steps that the inner wall of an outer-layer matrix steel pipe is pretreated and coated with an interface activation flux; raw materials containing waste steel, ferrochrome and the like are molten, ferrotitanium and ferroboron are sequentially added for alloying, then ferric oxide powder and metal yttrium are added for modification treatment, and inner-layer alloy liquid is obtained; the preheated outer-layer matrix steel pipe is placed in a rotating state, and the inner-layer alloy liquid is poured; and after the to-be-solidified pipe fitting is cooled to the room temperature, the pipe fitting is heated to the austenitizing temperature, heat preservation is conducted, and then isothermal quenching treatment is conducted. According to the method, interface oxides are effectively removed and firm metallurgical bonding is promoted by utilizing the interface activation flux; a core is formed through in-situ reaction of metal yttrium and ferric oxide so as to refine grains; and a lower bainite and retained austenite mixed structure is obtained through isothermal quenching, the comprehensive mechanical property of the cylinder sleeve is improved, and the service life of the cylinder sleeve is prolonged.

The invention relates to a method for improving the gel quality of skipjack surimi by using vegetable protein, and belongs to the technical field of surimi product processing. The method for improving the gel quality of the skipjack surimi by using the vegetable protein comprises the following steps: sequentially performing air chopping, salt blending, vegetable protein adding, mixing, chopping and moisture adjusting on skipjack meat at 4-10 DEG C to obtain mixed surimi; and filling a mold with the mixed surimi, carrying out heating shaping, and then carrying out ice water cooling to room temperature so as to obtain the surimi gel. The influence of different types and different contents of vegetable proteins on the quality of specific surimi gel is compared, and a proper amount of vegetable proteins are added to promote protein crosslinking so as to improve the strength, texture, water binding capacity and other gel properties of the surimi gel, so that the problems of insufficient strength and poor water binding capacity of the existing skipjack surimi gel are solved, and the skipjack surimi gel has a good application prospect. Therefore, technical support is provided for development of high-quality skipjack surimi products, and the skipjack surimi product has a wide application prospect.

This utility model discloses a crochet rope structure with an anti-corrosion coating, comprising a crochet rope body, which includes a core layer, a reinforcing braid layer, a buffer layer, and a coating layer, arranged sequentially from the inside out. The coating layer includes a base layer, an intermediate layer, and a top layer. The base layer is located inside the intermediate layer and is made of an epoxy resin and nano-clay composite material. The intermediate layer is located inside the top layer and is made of epoxy zinc-rich coating. The top layer is made of epoxy glass flake coating. The surface of the coating layer is coated with a fluorocarbon topcoat. This structure achieves corrosion resistance, increases practicality, and solves the problem that crochet ropes often face environmental erosion during use, leading to decreased rope strength, fiber breakage, and reduced service life.

The utility model relates to a high-strength light-weight vehicle cellular board which comprises a top layer cellular hole, a bottom layer cellular hole and a middle cellular hole, the top layer cellular hole, the bottom layer cellular hole and the middle cellular hole form a cellular hole unit, and peripheral holes incline towards a central hole at the same curvature. Through the unique honeycomb hole structure design, stress is effectively dispersed, the strength is improved, meanwhile, the weight is reduced, and the problem that the strength and the light weight of an existing vehicle honeycomb plate are difficult to balance is solved. Honeycomb holes are of a hexagonal structure and are tightly arranged to form a honeycomb shape, material consumption is reduced, and light weight is achieved. Connecting edges are arranged at the tops and the bottoms of the top-layer honeycomb holes and the bottom-layer honeycomb holes and used for being connected with other parts, the connecting edges and the honeycomb holes are connected through reinforcing ribs, and the edge strength is enhanced. Edge sealing structures are arranged on the side faces of the cellular board, internal cellular holes are prevented from being damaged, and connecting holes are formed in the edge sealing structures and used for being fixedly connected with other parts. The cellular board is made of high-strength aluminum alloy.

The invention belongs to the field of agricultural fertilizers, and provides a micro-mineral activator and an application thereof in improving the fertilizer efficiency of a bio-organic fertilizer. According to the invention, epoxy silane coupling modified potassium feldspar powder is adopted as a core to construct a two-phase collaborative design of humic acid coated core-shell composite powder IM-X and metal ion crosslinked microgel powder IM-Y; the balance between the compressive strength of the particles and the rapid disintegration and dispersion performance when encountering water is realized, the consideration of a high-solid-content low-water-adding-amount granulation process window and the rheological stability of a humic acid cross-linked network is considered, and the unification of moisture absorption and caking resistance during storage and transportation and water absorption and retention ion response regulation and control functions after application is realized; the mineral-organic composite additive solves the performance coupling contradiction of natural conflicts in physical and chemical mechanisms of the existing mineral-organic composite additive, has the advantages of good processing controllability, excellent storage and transportation stability and remarkable fertilizer efficiency improvement effect, and has wide application value in the field of bio-organic fertilizer synergism.

The application discloses a kind of mechanically activated coal gasification slag-based cementitious materials and preparation method thereof, and relates to coal gasification furnace slag solid waste resource utilization.Preparation method includes the following steps: S10, obtaining pretreated coal gasification slag;S20, pretreated coal gasification slag is mixed with fused salt according to mass ratio (4-19) :1, and fused salt blend is obtained;S30, fused salt blend is mechanically ground, and activated coal gasification slag is obtained;S40, activated coal gasification slag, Portland cement and water are respectively taken and stirred and mixed, and precast slurry is obtained;S50, precast slurry is cast into shape and cured, and mechanically activated coal gasification slag-based cementitious material is obtained.The application precisely controls mechanical grinding parameters, and improves the cementitious performance of coal gasification slag in a targeted manner, meeting the diversified needs of cementitious materials in different application scenarios in actual engineering.

The utility model relates to building material technical field, concretely, relate to the mute composite steel sheet with honeycomb sound insulation cavity, including mute composite steel sheet main part, mute composite steel sheet main part is composed of the surface layer steel sheet of setting in surface layer and the bottom layer steel sheet of setting in bottom layer, is provided with honeycomb sound insulation core layer between surface layer steel sheet and bottom layer steel plate, honeycomb sound insulation core layer is honeycomb structure, every honeycomb unit is regular hexagon, every honeycomb unit is filled with the damping sound insulation filling layer in, the edge position department of surface layer steel sheet and bottom layer steel plate all is provided with sealing rubber strip, the surface of surface layer steel plate is provided with surface wear -resisting layer, the utility model has the effect that guarantees strength and gives consideration to sound insulation, is not easy to damage.

The application discloses a composite cable connecting assembly, a strain-type fitting and a mounting method, and belongs to the technical field of composite material products. The composite cable connecting assembly comprises a composite cable core, the composite cable core comprises a composite core rod and aluminum strands covering the composite core rod, a part of the composite core rod is exposed outside the aluminum strands, and the composite cable connecting assembly further comprises at least one tapered portion fixed to the composite core rod exposed outside the aluminum strands, wherein the tapered portion is integrally wrapped and solidified by the same material as the composite core rod, and an accessory is fixed to the composite core rod through fastening cooperation with an outer tapered surface of the tapered portion. The composite cable connecting assembly, the strain-type fitting and the mounting method have better fatigue resistance, high connection stability, light overall weight and the advantage of convenient construction.

The invention relates to a high-strength and ultralow-magnetic susceptibility Au-Pt-Pd alloy wire as well as a preparation method and application thereof, and relates to the technical field of new materials. According to the preparation method, through the unique process combination of smelting, homogenization, severe plastic deformation and specific aging, the problem of contradiction between the alloy strength and the ultralow magnetic susceptibility is successfully solved, and the prepared Au-Pt-Pd alloy wire has the strength and the ultralow magnetic susceptibility far higher than those of a traditional Au-Pt alloy and still keeps certain plasticity.

This utility model discloses a lightweight, energy-saving molded cable tray, relating to the field of cable tray technology. It includes a cable tray body comprising a base plate and two side plates. Multiple first reinforcing components are evenly spaced on the base plate, each first reinforcing component including a first rectangular protrusion. This utility model features a rationally designed structure. By setting rectangular protrusions with weight-reducing grooves on the base plate and side plates, and using a stamping process to form the first and second weight-reducing grooves, the weight of the cable tray is significantly reduced, meeting lightweight requirements. The first and second support rods fixed within the weight-reducing grooves act like an internal "invisible skeleton," providing strong support for the cable tray. Combined with the molded reinforcing grooves, the structural strength is enhanced both laterally and longitudinally, enabling the cable tray to maintain reliable load-bearing capacity and deformation resistance while remaining lightweight. This solves the contradiction between lightweight and high strength inherent in traditional cable trays.

The invention belongs to the technical field of flat plate slot antenna manufacturing, and discloses a 6061 aluminum alloy flat plate slot antenna brazing and heat treatment manufacturing method. The method comprises the steps of preparing, cleaning, assembling, vacuum brazing, solution treatment and aging treatment, Al-Si-Ge series brazing filler metal is selected, and a vacuum uniform temperature field regulation and control process curve is researched and developed to achieve vacuum brazing of the 6061 aluminum alloy antenna. The problems that in an existing brazing system, the melting point of brazing filler metal is not matched with the melting point of base metal in temperature and the brazing filler metal is not melted synchronously and spread continuously due to uneven temperature distribution of a large-size antenna are solved, and it is guaranteed that a weld joint is continuous and compact. A multiphase flow cooling field homogenization regulation and control tool is used for establishing an antenna full-space cooling field, uniform and rapid cooling of the 6061 aluminum alloy antenna is achieved by regulating and controlling the air fog speed and the coverage area, the problem of solid solution deformation of a thin-wall structural part is solved, and it is guaranteed that the size of the antenna is stable, and the strength of the antenna is improved; and a specification is provided for engineering manufacturing of the high-precision 6061 aluminum alloy flat plate slot antenna.

The utility model relates to the related technical field of packing discloses a kind of plant fiber packing net, it includes several warp and weft knitted between every two warp, warp is the link formed circle chain of several fiber ring section, weft is knitted between every two circle chain, and warp and weft are prepared by hemp silk, every fiber ring section includes the open ring body, and two ends formed at the ring body opening, wherein first end extends to the ring body around being arranged in next section fiber ring section, second end extends to the ring body around being arranged in next two section fiber ring section, to link all fiber ring section to form circle chain in this way.The plant fiber packing net disclosed by the utility model is applied in agricultural livestock, without separate disassembly packing net, even if being eaten by livestock, completely eliminate the risk of intestinal obstruction caused by traditional plastic net;When applied in papermaking field, it can be completely dissolved in pulping process, to avoid the grade of finished paper due to residual to reduce.

This invention provides an amino-functionalized transparent impact-resistant isophthalic resin and its preparation method, belonging to the field of functional polymer material synthesis. The amino-functionalized transparent impact-resistant isophthalic resin is a multi-component copolymer of styrene, isoprene, and a p-chloromethylstyrene derivative monomer containing tertiary amine functional groups. The preparation method employs a classic anionic polymerization method. First, an amino-functionalized polystyrene active segment SN1 is prepared. Then, it is added to a styrene / isoprene mixed monomer for a two-stage reaction to obtain a block copolymer segment SN1-SP with alternating styrene / isoprene sequences. Finally, styrene and the amino-functionalized monomer are added for a three-stage reaction or directly coupled with a coupling agent to obtain a special block copolymer SN1-SP-SN2, successfully yielding the amino-functionalized transparent impact-resistant isophthalic resin. By controlling the length of the special alternating sequence molecular chain and the block composition ratio, the mechanical properties of the product are controlled. Simultaneously, the tertiary amine polar groups are quantitatively introduced into the molecular chains, successfully achieving high impact resistance and transparency, and also enhancing the resin polarity. Using a lithium-based polymerization method, the resin particles are free of monomer and harmful impurities.

The application discloses a ferrite-pearlite steel structure heat treatment method, and relates to the technical field of metal material heat treatment, and aims at solving the technical problem that the ferrite-pearlite steel processed by the existing heat treatment process has high strength but low toughness. The ferrite-pearlite steel structure heat treatment method comprises the following steps: heating and elevating a ferrite-pearlite steel workpiece to a temperature 30-60 DEG C higher than Ac3, and performing first heat preservation treatment under the temperature condition; the time of the first heat preservation treatment is at least the time required for the temperature distribution of the steel workpiece to be uniform; after the first heat preservation treatment, the steel workpiece is cooled to a temperature 0-60 DEG C higher than Ac1, second heat preservation treatment is performed under the temperature condition, and then the steel workpiece is cooled to normal temperature, the heat treatment is completed, and the time of the second heat preservation treatment is at least the time required for the temperature distribution of the steel workpiece to be uniform. The technical scheme provided by the application is used for heat treatment of the ferrite-pearlite steel workpiece, so as to improve the toughness of the steel workpiece.

This invention provides a coreless stator with a high magnetic flux density and a thin working area, and an axial flux motor. The coreless stator includes a first winding unit and a second winding unit stacked axially. Several winding coils of the first and second winding units are fabricated on a conductive substrate using a subtractive process. Each winding coil includes a working area, a hollow slot, and bent outer and inner coil bridging areas. The first and second winding units are circumferentially misaligned during axial stacking, so that the working areas of the first and second winding units are circumferentially spaced and distributed in the same radial plane, forming the stator working section. The thickness of the stator working section does not exceed half the total thickness of the coreless stator. This application further thins the stator working section of the coreless stator, significantly reducing the effective working air gap length of the axial flux motor, significantly enhancing the air gap magnetic flux density, improving the motor's torque density and power density, and achieving synergistic optimization of performance and reliability.

The invention discloses a rolling method for improving the hardness of a steel rail with standard strength. The production process comprises the following steps: molten iron in a steelmaking process, converter smelting, LF (ladle furnace) refining, VD (vacuum degassing) and continuous casting to ensure the purity and component uniformity of molten steel; rolling and subsequent processes: heating by a stepping furnace, descaling by high-pressure water, rolling by a universal rolling mill, cooling and pre-bending by a cooling bed, straightening, carrying out ultrasonic flaw detection, processing, checking and warehousing; the steel rail comprises the following chemical components in percentage by mass: 0.81-0.86% of C; s : 0.52%-0.59%; mn: 1.17 to 1.25%; less than or equal to 0.020% of P; less than or equal to 0.020% of S; 0.23 to 0.28% of Cr; 0.03 to 0.05 percent of N ; and the balance Fe and impurities. The low-cost and high-quality high-speed steel rail steel is prepared by optimizing the chemical components of the steel grade and customizing the controlled rolling and controlled cooling process, and the hardness, strength and toughness of the high-speed steel rail steel all meet the American standard requirements.

The application discloses a kind of high-strength corrugated pipes for drainage and manufacturing method thereof, belong to the technical field of corrugated pipe.The corrugated pipe includes the following weight parts components: 50-75 parts of PVC, 8-15 parts of HPVC, 5-15 parts of HNBR, 5-10 parts of modified filler, 4-8 parts of toughening agent, 1-2 parts of antioxidant, 1-3 parts of heat stabilizer, 0.4-1.1 parts of lubricant.By the raw materials of above-mentioned formula are mixed at high speed, using one-step continuous extrusion molding process, under the temperature parameter and blow pressure of accurate control, plasticizing, extruding, blow setting, traction cutting preparation obtains high-strength corrugated pipe for drainage.Compared with prior art, the high-strength corrugated pipe for drainage of the application solves the problem of poor filler dispersibility and weak interface bonding through multi-level synergistic effect.Testing shows that the corrugated pipe of the application has high ring stiffness and excellent low-temperature impact resistance, long service life, and is especially suitable for high-standard drainage engineering.

This invention relates to a two-component cross-linked oxidized nanocellulose spray hemostatic gel, its preparation method, and its application, belonging to the field of biomedical materials. Addressing the problems of weak adhesion, insufficient mechanical properties, and biocompatibility risks in existing hemostatic materials, this invention introduces aldehyde groups using sodium periodate to prepare an adhesive component (TOCN-CHO), and simultaneously modifies the carboxyl groups of TOCN with lysine to create a cross-linking component (TOCN-Lys). After the two components are sprayed and mixed, the aldehyde groups of TOCN-CHO bind to the amino groups on the tissue surface to achieve wound sealing. Simultaneously, the amino groups of TOCN-Lys form a Schiff base cross-linking network in situ with the aldehyde groups of TOCN-CHO, enhancing mechanical strength while eliminating aldehyde toxicity. The gel retains shear-thinning properties and can be sprayed. Animal experiments show that the hemostasis time is reduced to 28 seconds. It also exhibits biodegradability and renewability, effectively solving the problem of synergistic optimization of adhesion, mechanical strength, and biocompatibility, making it suitable for emergency hemostasis and surgical scenarios.

The invention discloses a method for predicting time-varying bearing capacity of a main cable of a suspension bridge based on a steel wire performance degradation theory. The method comprises the following steps of: performing cable opening inspection on a key section and drawing a multi-section corrosion distribution diagram; obtaining different grades of steel wire samples and constructing an ECDF; reversely acquiring the initial diameter and the initial bearing capacity of the corroded steel wire by utilizing an equal probability mapping principle; calculating an annual average corrosion rate based on the initial performance and a zinc coating loss state, and constructing a corrosion rate ECDF; performing performance reconstruction on the full-section steel wire according to the corrosion distribution diagram, and performing differentiation annual corrosion rate assignment on the steel wires in different areas in the section; and obtaining a final predicted value of the residual bearing capacity of the main cable after the service year through combination of load increment iteration and Monte Carlo simulation. According to the method, the problem of prediction deviation caused by the unknown initial state of the main cable and non-uniform section corrosion distribution is solved, scientific characterization of the time-varying resistance of the main cable is realized, and the method is of great significance in guaranteeing safe operation of the whole life cycle of the suspension bridge.

The application relates to the technical field of steel structure node connection, and discloses a node connection structure and a cooling tower, which is used for the intersection node of two overlapped and intersected rod pieces and comprises two oppositely arranged clamping plates which are distributed on the two sides of the two rod pieces and are provided with limiting grooves on the inner sides corresponding to the two rod pieces; and a clamping piece which is clamped on the edges of the two clamping plates at two ends and is fastened and connected between the two clamping plates and the clamping piece to clamp and fix the two rod pieces between the two clamping plates. In the application, the rod pieces do not need to be broken at the node, the rod pieces are provided in length, the rod pieces are obliquely overlapped, the overall stability of the structure is stronger, the strength is higher, and the limiting grooves corresponding to the two rod pieces are arranged in the two clamping plates, the two rod pieces can be constrained and limited in the preset intersecting direction, the rod pieces can be prevented from sliding, and the stability of the overall structure is further improved.

This invention discloses a method for preparing a nano high-frequency high-speed substrate; belonging to the field of copper clad laminate substrate preparation technology; its key technical points include the following steps: (1) Mixing: Weigh 50-60 parts of liquid crystal bismaleimide / diallyl diphenyl ether copolymer, 20-30 parts of organic solvent, 17.5-30 parts of modified hexagonal nano boron nitride sheet KH570-BNNSs suspension, 1-2 parts of flame retardant, 0.2-0.5 parts of curing agent and 0.5-1.0 parts of coupling agent and pass through a mixture at 1500 rpm. (1) High-frequency high-speed adhesive is obtained by high-speed stirring for 2-4 hours; (2) Adhesive application: the low dielectric constant glass fiber cloth is unwound, initially impregnated with the high-frequency high-speed adhesive, and then impregnated on one side before being mainly impregnated to remove the air in the low dielectric constant glass fiber cloth. Then, it is extruded and dried in sequence to obtain a semi-cured sheet; (3) Assembly; (4) Pressing; The present invention aims to provide a method for preparing a nano high-frequency high-speed substrate with a scientific preparation method, high substrate strength and low water absorption rate; used for the preparation of copper clad laminate substrates.

The present application relates to the technical field of aluminum alloy production and processing, and particularly relates to an easily-extruded high-strength corrosion-resistant aluminum alloy, a manufacturing method thereof and an application thereof. The present application realizes the purpose of improving the material performance by using a higher Zn element while ensuring the corrosion resistance of the material by reasonably adjusting the proportion of Mg, Si and Zn elements. This method can not only improve the strength of the aluminum alloy, but also improve its corrosion resistance, thereby solving the problem of adding a large amount of alloy elements in the prior art, reducing the production cost and the difficulty of alloy element recovery. By controlling the alloy composition and the total aluminum content, the present application ensures that the extrusion deformation resistance of the aluminum alloy is small, has excellent extrudability, and controls the content of some elements to reduce the quenching sensitivity, so that the alloy can produce more complex thin-walled section shapes. The aluminum alloy material of the present application can still maintain good corrosion resistance in a high-humidity and high-salinity environment.

The application relates to the technical field of roadway supporting, and provides a soft rock dynamic pressure roadway supporting method adopting a combined supporting device, which comprises the following steps: S1, prefabricating a connecting piece 5 and a supporting unit; S2, performing double-gradient grouting on roadway surrounding rock; S3, constructing a roadway surrounding rock anchoring system; S4, installing a bearing plate on the roadway surrounding rock; S5, according to the shape of a roadway section, splicing the connecting piece and a plurality of the supporting units to form a rectangular roadway combined supporting device or a three-star arch roadway combined supporting device; S6, installing a displacement sensor, a pressure sensor group and a controller; S7, performing floor heave construction; and S8, dynamically supporting and regulating. The application provides a combined supporting device integrating "active support-real-time monitoring-dynamic compensation-floor reinforcement", and solves the multi-dimensional deformation problem of an extremely soft rock dynamic pressure roadway through structural innovation and construction process optimization.