102results about How to "Increased shear strength" patented technology

According to the production method of the hot-rolled extra-thick and ultra-wide double-metal composite plate, S30403 is selected as a stainless steel layer, and the stainless steel layer comprises the following chemical components in percentage by mass: 0.02%-0.029% of C, 0.3%-0.5% of Si, 0.8%-1.0% of Mn, less than or equal to 0.04% of P, less than or equal to 0.005% of S, 18.0%-18.8% of Cr, 8.0%-8.2% of Ni and the balance of Fe and inevitable impurities; the base layer is made of Q355B low-alloy high-strength steel and comprises the following chemical components in percentage by mass: 0.06%-0.12% of C, 0.15%-0.3% of Si, 1.45%-1.6% of Mn, less than or equal to 0.02% of P, less than or equal to 0.005% of S, 0.02%-0.05% of Al, 0.008%-0.02% of Ti and the balance of Fe and inevitable impurities; the key process steps comprise assembling, heating, rolling, cooling and finishing, and industrial preparation of the high-performance bimetal composite plate with the width larger than 3.5 m, the total thickness not smaller than 100 mm, the base material larger than or equal to 90 mm and the stainless steel coating larger than or equal to 10 mm is achieved.

The invention discloses a multi-layer steel structure connecting frame. The multi-layer steel structure connecting frame sequentially comprises a bottom-layer frame, a top-layer frame and at least one middle-layer frame between the bottom-layer frame and the top-layer frame from bottom to top. The frames comprise stand columns, and every two adjacent stand columns are connected through a cross beam. The adjacent frames are connected up and down through connecting assemblies; the connecting assembly comprises a first connecting piece and a second connecting piece. The first connecting piece comprises a first rectangular frame and a first sleeve. The second connecting piece comprises a second rectangular frame and a second sleeve, and the opening end of the second sleeve is opposite to the opening end of the first sleeve. The connecting rib is connected with the first connecting piece and the second connecting piece. The first connecting piece and the second connecting piece are connected in an anchoring mode through the mutual inserting design of the connecting ribs and the sleeves, so that the connecting ribs and grouting materials are combined more firmly, the strength and stability of the structural connecting portion are improved, and structural potential safety hazards caused by dislocation or looseness of the connecting ribs are avoided.

The invention relates to the field of buildings, in particular to a reinforced concrete member manufacturing method and a post-cracking bending rigidity calculation method.The reinforced concrete member manufacturing method comprises the following steps that S1, a steel reinforcement framework is fixed to the set position of a concrete pouring mold, and a reinforced area of a concrete body is determined; s2, determining structural parameters of the reinforcing grooves and the reinforcing ribs; s3, the foam board is cut to enable the shape of the foam board to correspond to the shape of the reinforcing groove, and the foam board is fixed to the position, corresponding to the reinforcing area, in the concrete pouring mold; s4, concrete is poured into the concrete pouring mold, a concrete main body is formed after the concrete is cured and solidified, and after the concrete main body is demolded, the internal foam plate is emptied to form a reinforcing groove; and S5, reinforcing ribs are inserted into the reinforcing grooves, the reinforcing grooves are filled with UHPC, and machining of the concrete member is completed after maintenance. The bearing capacity and durability of the reinforcing system are improved, meanwhile, the glass fiber reinforced resin composite material in the retired wind power blade is applied to the reinforcing system, and the reinforcing cost is reduced.

The present application relates to the technical field of bamboo fiber composite material, in particular to a purification preparation method of bamboo fiber reinforced natural polymer composite material. The bamboo raw material is crushed and treated by steam explosion to obtain primary bamboo fiber; the primary bamboo fiber is sequentially subjected to organic solvent dewaxing treatment and oxidation system selective delignification treatment to obtain purified bamboo fiber; the purified bamboo fiber is treated in a tannin acid solution to form a polyphenol interface layer on the surface thereof; and a solution containing polyvalent metal ions is added to the treated bamboo fiber to form a coordination cross-linking interface layer on the surface of the bamboo fiber. The present application constructs a stable interface layer between the fiber and the natural polymer matrix. The interface layer can effectively transfer stress, significantly improve the tensile strength, bending strength and shear strength of the composite material, and solve the problem of weak interface and easy delamination of traditional natural composite materials.

The application relates to the technical field of automobile manufacturing, and discloses a welding support device for automobile sheet metal parts, which comprises a layout base, a main hole position positioning support is arranged on the top of the layout base, a main clamping positioning support is arranged on the left side of the main hole position positioning support, and a clamping welding assembly is arranged on the left side of the main clamping positioning support. The bottom welding electrode is moved upward through the operation of the bottom telescopic rod, the bottom welding electrode is in contact with the main sheet metal, the top welding electrode is moved downward through the operation of the top telescopic rod, the top welding electrode is in contact with the auxiliary sheet metal, the top welding electrode and the bottom welding electrode are electrified, heat generated by the current at the contact point melts the main sheet metal and the auxiliary sheet metal, and the main sheet metal and the auxiliary sheet metal are solidified under the pressure of the top telescopic rod and the bottom telescopic rod to form welding points, at this time, the main sheet metal and the auxiliary sheet metal are preliminarily welded, and the problems that the existing support device cannot clamp the main sheet metal and the auxiliary sheet metal for welding immediately, and the mechanical hand carrying the spot welding device needs to consume time during movement and leads to low efficiency are solved.

The application discloses a preparation method of a large-bore air-cooled diesel engine piston and specifically comprises the following steps: S1, modeling and dividing regions; S2, gradient printing; and S3, coating addition; and relates to the technical field of diesel engine pistons. The preparation method of the large-bore air-cooled diesel engine piston realizes the synergistic optimization of the overall performance of the piston through gradient printing of the piston, realizes the lightweight of the piston in cooperation with the honeycomb lattice structure, reduces the abrasion amount by using silicon carbide, improves the wear resistance of the top region, forms zirconium tri-aluminum nano precipitated phases by zirconium, refines the grains, forms a composite precipitated phase by using scandium, zirconium and aluminum, improves the high-temperature strength, constructs an efficient heat conduction network by using graphene nanosheets, improves the heat conductivity of the middle region, forms a three-dimensional network by using carbon nanotubes, improves the toughness of the skirt region, and has high interfacial bonding strength by spraying a wear-resistant and corrosion-resistant coating on the surface of the piston, reduces the friction, improves the service life of the piston and effectively reduces the maintenance cost.

This invention relates to transition layer materials and welding processes for welding dissimilar steel and aluminum materials, belonging to the field of welding technology. The transition layer material for welding dissimilar steel and aluminum materials of this invention comprises a copper layer, a copper alloy layer, and a zinc alloy layer arranged sequentially; the copper layer is adjacent to the steel base material, and the zinc alloy layer is adjacent to the aluminum base material; the copper content in the copper alloy layer is 62.0%-64.0%; the zinc content in the zinc alloy layer is 89.0%-91.0%; the mass ratio of the copper layer, copper alloy layer, and zinc alloy layer is (0.9-1.1):(2.3-2.7):(1.8-2.2). By sequentially setting the copper layer, copper alloy layer, and zinc alloy layer between the steel base material and the aluminum base material, a gradual transition from the steel base material to the aluminum base material is achieved, effectively avoiding the formation of brittle Fe-Al intermetallic compounds during direct welding, and enhancing the mechanical properties and durability of the welded joint.

The invention provides a construction method of a prefabricated assembled roadbed structure of a new and old expressway, which comprises the following steps: S1, carrying out stepped excavation on an old roadbed splicing area, and connecting a plurality of first splicing units with an old roadbed through a longitudinal insertion structure; s2, the first splicing units and the second splicing units are connected through first bolt connecting sets, and the second splicing units are connected through transverse inserting structures; s3, the adjacent first splicing units and the connected second splicing units are connected through second bolt connecting sets; s4, the first splicing unit and the second splicing unit are each connected with a leveling assembly used for adjusting the elevation and levelness of the first splicing unit and the second splicing unit; s5, sealing pieces are arranged between the first splicing units, between the first splicing units and the second splicing units and between the second splicing units; and S6, cast-in-place structures are arranged at the joints of all the splicing structures, the site cast-in-place workload is reduced, and rapid splicing of the new roadbed and the old roadbed is achieved.

This utility model relates to the field of building decoration materials technology, specifically to a crack-resistant splicing structure for lightweight partition boards. The crack-resistant splicing structure for lightweight partition boards provided by this utility model includes a first wall panel and a second wall panel. The upper end of the splicing end face of the first wall panel is provided with a protruding male tenon, and the upper end of the splicing end face of the second wall panel is provided with a grooved female tenon matching the male tenon. Simultaneously, the lower end of the splicing end face of the first wall panel is provided with the same female tenon as the second wall panel, and the lower end of the splicing end face of the second wall panel is provided with the same male tenon as the first wall panel. The front end of the male tenon is slidably connected to an insert tenon via a guide groove, and the lower inner side of the female tenon is provided with a positioning groove matching the shape of the insert tenon. An elastic crack-resistant layer is embedded on both sides of the male tenon, protruding 0.5-2mm from the surface of the male tenon. The female tenon is located above the positioning groove and has a limiting insertion hole matching the positioning groove, through which a positioning pin is inserted.

The application discloses a shear connector, a steel-concrete composite beam containing the shear connector and a construction method of the steel-concrete composite beam. The shear connector comprises an inverted truncated cone type cylinder (7), a stiffener, a cover plate, a penetrating steel bar (8) and a high-strength bolt (21); the stiffener comprises an integrally formed stiffener bottom plate (13) and a stiffener side plate (14), the size of the stiffener bottom plate is consistent with the size of the lower opening of the cylinder, and the stiffener bottom plate is attached to the lower opening of the cylinder; the stiffener bottom plate is provided with a second connecting hole for connecting the high-strength bolt; the stiffener side plate is arranged around the stiffener bottom plate and is attached to the inner wall of the cylinder; the height of the stiffener side plate is lower than that of the first connecting hole; the cover plate covers the upper opening of the cylinder; the penetrating steel bar transversely passes through the cylinder through the first connecting hole and leaves a connecting section on each side of the cylinder; and the high-strength bolt connects the stiffener bottom plate through the second connecting hole. The application realizes the disassembly and replacement of each component of the shear connector and the prefabricated bridge deck; and the structure form and stress performance of the shear connector are optimized.

The invention discloses a preparation method of an anti-rebound paper-based thread and a product, and belongs to the technical field of plant fiber reinforced processing. According to the method, a high-density fiber skeleton is constructed through hydraulic forced densification, so that the density of a thread area reaches 1.1-1.3 g / cm; then dip-coating a modified silicate system containing 4% of nano silica sol and 5% of glycerol, and locking fiber deformation through a cross-linking reaction; and finally, precisely slitting in a semi-solidified state. The thread form retention rate of the prepared paper-based thread is larger than or equal to 95%, the surface hardness is improved by 3-4 times, opening and closing can be supported for 300 times or above, and the problems of springback, layering and abrasion of a traditional paper thread are solved. When being matched with paste packaging, the regenerated plant cellulose barrier layer is arranged on the inner wall of the tube body, and the section is coated with the water-based acrylic acid layer, so that the tube is environment-friendly, low in cost and suitable for precise packaging scenes.

The application provides a two-component polyurethane pouring sealant and a preparation method and application thereof. The two-component pouring sealant comprises an A component and a B component. The A component comprises propylene oxide modified lignin polyol and erythritol modified polyether polyol. The B component comprises cashew phenol based polyurethane prepolymer. The propylene oxide modified lignin polyol, the erythritol modified polyether polyol and the cashew phenol based polyurethane prepolymer have a synergistic effect, which can significantly improve the shear strength of the pouring sealant at high temperature, and the pouring sealant has good low-temperature bonding performance, aging resistance and impact resistance. Specifically, the shear strength at 60 DEG C is greater than 13 MPa, the shear strength remains above 12.5 MPa after aging in a double 85 environment, the attenuation rate is less than 7% compared with the shear strength at room temperature, the shear strength can remain above 13 MPa after high-low temperature impact test, the attenuation rate is less than 3%, and the pouring sealant meets the pouring requirements of power batteries in the field of new energy batteries.

This application relates to a traction-type continuous core membrane water-stopping system, comprising an undisturbed soil mixing body (2), a closed or long continuous core membrane (1) erected in the undisturbed soil mixing body (2) after implementation, and auxiliary components (3) for sealing nodes. The implementation components for forming this water-stopping system include the core membrane (1), a casing (4) containing the core membrane (1) and a forwarding device (5), the forwarding device (5), an implantation device (6), a traction rope (8), and a traction device (7). The forwarding device (5) connects the traction rope (8) and the core membrane (1) and pulls the built-in core membrane (1) forward and unfolds within the undisturbed soil mixing body (2). The traction device (7) pulls the forwarding device (5) and the core membrane (1) unfold within the undisturbed soil mixing body (2). This system can be effectively implemented and forms a continuous and reliable water-stopping structure. It has a fast construction speed, good water-stopping effect, and low cost, and is especially suitable for foundation pit and slope water-stopping.

This utility model discloses a quick-installation and quick-disassembly connection device for door and window sashes, including a first connecting seat for connecting the door and window sashes and a second connecting seat for connecting the hinges. The first connecting seat has a receiving cavity, and the second connecting seat has a limiting part that can extend into the receiving cavity. A locking member that can lock with the limiting part is movably connected in the receiving cavity, thereby connecting the second connecting seat and the first connecting seat. A pressing member that can drive the locking member to disengage from the limiting part is also movably connected in the first connecting seat. The locking member is elastically connected to the first connecting seat, thereby enabling the pressing member to reset and lock the locking member with the limiting part. The user only needs to press once to trigger the separation of the locking member from the limiting part, realizing the quick disassembly of the movable sash. After releasing the pressing member, the locking member can automatically reset under the drive of the elastic connection and re-lock with the limiting part. The entire process does not require the use of screwdrivers or other tools, greatly simplifying the operation steps, eliminating screw fixation, and improving installation efficiency and aesthetics.

The utility model discloses a stirring tooth structure of a granulator, which comprises a stirring tooth seat and stirring teeth, the bottom of the stirring tooth seat is cylindrical, the middle of the stirring tooth seat is in frustum transition, the upper part of the stirring tooth seat is cylindrical, the diameter of the upper cylinder is smaller than that of the lower cylinder, the upper cylinder is processed into internal threads, the stirring teeth are processed by cylinders, and the half-length surface of each stirring tooth is processed into threads. And two sides of the top part are symmetrically processed into slope surfaces with certain angles. The stirring tooth is simple in structure and easy to manufacture, the improved design is carried out on the basis of summarizing the abrasion rule of the stirring teeth, the easily-abraded points of the stirring teeth are effectively avoided on the premise that the stirring and rubbing functions are not affected, the service life of the stirring teeth is prolonged, the replacement and maintenance frequency of the stirring teeth is reduced, and the production efficiency is improved; and the pointed-end stirring teeth are beneficial to generating higher shearing strength, so that the power consumption is lower on the premise of generating the same shearing force.

The application discloses a robot joint protection assembly based on a foamed aluminum buffer structure and relates to the technical field of robot protection.The device ingeniously introduces passive active heat dissipation (energy-saving and high-efficiency) without additional fans or power driving, skillfully converts the motion kinetic energy of the robot into wind pressure, realizes intelligent heat management of 'heat dissipation during work and air suction during stop', effectively reduces the motor temperature, significantly prolongs the service life, and is mechanically self-cleaning and low in maintenance cost: aiming at the pain point of dust in industrial environment, full-automatic dust scraping and centrifugal dust removal are realized by using a pure mechanical structure, which not only eliminates secondary pollution caused by dust falling back, but also avoids the trouble of artificial regular disassembly and cleaning, and greatly reduces the later operation and maintenance cost.

The utility model discloses a building optimization structure for an irrigation district canal system, which belongs to the technical field of irrigation district canal systems and is characterized by comprising a slope body, the top of the slope body is fixedly connected with a drainage component, the front side of the slope body is clamped with a building block component, the building block component comprises cells, and the cells are clamped on the front side of the slope body. Inverted filter pads are fixedly connected to the bottoms of the cells, drainage pads are fixedly connected to the tops of the inverted filter pads, planting blocks are clamped in the cells, planting plates are clamped in the cells, the effect of preventing the slope from collapsing is achieved by arranging the building block assembly, meanwhile, the shear strength of soil is improved, and the stability of the slope is improved; according to the device, the occurrence risk of geological disasters such as landslide and collapse is reduced, the amount of pollutants entering a water body is reduced, the water quality is improved, meanwhile, rainwater drainage is conveniently guided in the rainfall process by arranging the drainage assembly, rainwater can be prevented from being concentrated at plant root systems, and therefore it is avoided that the water content of the plant root systems is too large due to rainwater.

The FRP rod type combined tie piece comprises a five-direction communicating structural piece, a reinforcing steel bar bolt and a fiber reinforced composite material rib, the five-direction communicating structural piece comprises two horizontal connecting pipes which are perpendicular to each other, and a vertical connecting pipe is arranged at the communicating point of the two horizontal connecting pipes; the two ends of the fiber reinforced composite material rib are inserted into the vertical connecting pipes of the two five-way communicating structural parts respectively and are fixedly connected with the five-way communicating structural parts in an inserted mode through the reinforcing steel bar plug pins, and the combined tying part is formed. In practical application, leaf plate steel bars of the sandwich thermal insulation wallboard directly penetrate into the two horizontal connecting pipes which are vertically arranged to form a binding-free three-dimensional steel bar net rack, and after concrete is poured, the pulling pieces and the concrete form a composite stress body through the occlusion effect of aggregate. In the building construction process, the construction efficiency is improved, the anchoring problem of the tie piece is solved, the overall mechanical property of the sandwich heat preservation wallboard is guaranteed, and the FRP tie piece has important significance for overcoming the defects of a common commercial FRP tie piece.

The utility model relates to the technical field of corrugated boards, in particular to a corrugated board with a honeycomb structure, which mainly solves the problems of low longitudinal compressive strength and poor buffering performance of a honeycomb paperboard in the prior art, and comprises a corrugated board body which comprises a surface layer, a middle layer and a bottom layer, the surface layer comprises a first surface layer, a second surface layer with a wave structure and a third surface layer with a wave structure, the second surface layer is provided with a second wave crest and a second wave trough, the third surface layer is provided with a third wave crest and a third wave trough, the lower surface of the second wave trough is compositely connected with the upper surface of the third wave trough, and the amplitude of the second wave crest is larger than that of the third wave crest; a plurality of grooves are concavely formed in the upper surface of the middle layer, the upper surface of the middle layer is in composite connection with the lower surface of the third surface layer, the third troughs are embedded in the grooves, and the upper surface of the bottom layer is in composite connection with the lower surface of the middle layer.

The utility model relates to building technical field discloses a prefabricated pipe pile stand column steel support joint, including prefabricated pipe pile stand column, the pile head is arranged at the top of prefabricated pipe pile stand column, the microexpansion concrete filling core is equipped in prefabricated pipe pile stand column, the microexpansion concrete filling core bottom end is fixedly connected circular thin steel plate through anchor bar, the top end fixedly connected with anchor plate of anchor bar, the pile head is equipped with longitudinal reinforcement framework and transverse stirrup, steel support, steel support sets up on anchor plate, and the groove section steel is connected through the welding of the angle weld of steel support side surface and forms. In the utility model, the longitudinal reinforcement framework and transverse stirrup are arranged in the pile head to form the reinforcement net cage, and the microexpansion concrete filling core is adopted to pour to enhance the bending, shearing strength of pile head, and the connecting structure of anchor bar, anchor plate and circular thin steel plate makes steel support load can be evenly transmitted to prefabricated pipe pile stand column through anchor plate, and the reliable bearing capacity and crack resistance of node are ensured.

The invention relates to a pressing process of a cold plate and a heating film. The pressing process comprises the following steps: mixing glue and a curing agent according to a mass ratio of (100: 1)-(110: 1); the cold plate is subjected to area covering in a closed environment, and then water-based glue is sprayed; baking the glued cold plate at 50-60 DEG C for 3-5 minutes to form a glue film; the heating film is attached to the adhesive film within 1-2 min, the adhesive film is placed in a profiling clamp to be rolled and exhausted, and appearance inspection and air tightness detection are conducted; staged hot pressing treatment is conducted, specifically, hot pressing is conducted for 4 min to 7 min at the temperature of 50 DEG C to 55 DEG C under the pressure of 2.3 MPa to 2.6 MPa, and then heat curing is conducted for 4 min to 7 min at the temperature of 100 DEG C to 110 DEG C under the pressure of 2.8 MPa to 3.2 MPa; and finally, standing at normal temperature to obtain a finished product. According to the process, a medium of an existing cold plate integrated heating film is replaced with the water-based glue, efficient integration of the cold plate and the heating film is achieved through the precisely-controlled pressing process, and the reliability and performance of a product are improved.

The invention discloses a mechanical arm for machining and welding automobile parts. The mechanical arm comprises a base; one end of the big arm is rotationally assembled on the upper end face of the base; the small arm is rotationally assembled at the other end of the large arm; one end of the wrist joint arm is rotationally connected to the end part of the small arm, and the other end of the wrist joint arm is rotationally connected with a connecting flange; the welding gun unit is mounted on the lower end face of the connecting flange; the edge pressing unit is assembled on the welding gun unit; the mechanical arm can continuously complete the action of pressing, bending and welding in one-time clamping and positioning, the time for workpiece transferring and repeated positioning is greatly shortened, and the production takt time and the overall machining efficiency are remarkably improved; and accurate and reliable clamping force can be applied to an area adjacent to a welding point, and micro-motion, warping and deformation of a thin plate part in the welding process are effectively restrained.

This invention relates to the technical field of road engineering, and in particular to a method for converting old road structures into long-life pavement structures based on low-carbon cold recycling, comprising the following steps: S1, milling and recycling of the old pavement layer; S2, conversion of the semi-rigid base course system by vibratory compaction using a road roller to convert the semi-rigid base course into a granular flexible subbase course; S3, injection of a semi-flexible isolation layer; injection of a highly permeable slurry into the crushed base course to form a flexible recycled isolation layer; S4, forming of the flexible recycled base course; uniformly spreading a mixture of milled recycled material and new aggregate on the isolation layer, and simultaneously spraying and injecting bio-based modified emulsified asphalt; S5, laying of a low-carbon surface layer; spraying a modified emulsified asphalt tack coat onto the surface of the flexible recycled base course, followed by spreading a rubber asphalt concrete surface layer, and finally compacting it. The construction method of this invention solves the problems of "high carbon emissions, rapid recurrence of reflective cracks, and short lifespan" in traditional old road reconstruction and expansion.

This utility model relates to the field of paving brick technology and discloses a high-quality permeable paving brick made of natural sand, including a permeable skeleton layer, a bottom layer of high-quality natural sand permeable paving bricks at the bottom of the permeable skeleton layer, and a top layer of high-quality natural sand permeable paving bricks at the top of the permeable skeleton layer. In use, the corresponding conical drainage channels and through holes are coaxial and connected, achieving dual-effect permeability through siphoning and flushing. When water flows through the surface layer of the high-quality natural sand permeable paving bricks, the conical drainage channels increase the flow velocity and generate negative pressure suction. When the water flow is large, a high-speed jet forms in the channels to flush away sediment. The bricks are arranged in a honeycomb pattern during laying, and the corresponding arc-shaped male tenons and arc-shaped female tenons form an interlocking structure. The curved joints can automatically level the angle, and the interlocking structure increases the effective permeable joint width, thus improving permeability. The drainage channels in the interlocking area can form a dual drainage channel with the vertical infiltration holes.

This invention relates to the field of knife manufacturing technology and discloses a method for preparing a knife with antibacterial effects, comprising the following steps: smelting a nitrogen-containing antibacterial martensitic stainless steel blade blank; heating, cooling, and tempering the nitrogen-containing antibacterial martensitic stainless steel blade blank to obtain the blade; hot isostatic pressing of a pure titanium ingot to obtain a densified titanium metal handle; and connecting the blade to the densified titanium metal handle using a tin-silver-based brazing filler metal at 680°C to 750°C via induction heating. This invention solves the problems of decreased hardness and corrosion resistance caused by silver precipitation through the synergistic effect of nitrogen and silver, utilizing nitrogen solid solution strengthening and potential compensation mechanisms; and employs a low-temperature tin-containing brazing process to construct a physical barrier layer, blocking carbon diffusion to the titanium side and the formation of brittle phases, thus avoiding over-tempering softening of the blade substrate, resulting in a knife with high hardness, corrosion resistance, long-lasting antibacterial properties, and high connection strength.

This utility model relates to the field of composite cable technology, and more particularly to a multi-layered synergistic reinforced composite cable with a stranded inner core. The cable body includes a stranded inner core located at its center, an inner lining layer tightly fitted to the outside of the stranded inner core, and a composite layer surrounding the inner lining layer. The stranded inner core extends axially along the cable body. The composite layer includes an armor layer, a protective layer, a flame-retardant layer, and a wear-resistant layer arranged sequentially from the inside out. The armor layer, protective layer, flame-retardant layer, and wear-resistant layer are integrally formed by hot-melt bonding. This utility model achieves a significant improvement in comprehensive performance through the synergistic design of its multi-layered structure, possessing multiple advantages such as high strength, high flexibility, wear resistance, flame retardancy, and aging resistance. It is suitable for demanding applications such as marine engineering, lifting and transportation, and mining.

The invention provides a carbon fiber sizing method, and belongs to the technical field of carbon fibers, the carbon fiber sizing method comprises the following steps: S1, providing a waterborne epoxy-polyurethane hyperbranched sizing agent; s2, diluting the sizing agent with deionized water until the concentration of the sizing agent is 1.5 wt%-3.5 wt%; s3, enabling the carbon fiber to be in contact with the diluted sizing agent, and performing sizing coating; and S4, the carbon fibers coated with the sizing agent are subjected to drying and heat treatment, and a sizing agent coating is formed on the surfaces of the carbon fibers. According to the invention, an epoxy-polyurethane hybrid system and a hyperbranched structure are combined, and a double-reaction-activity bridging agent is combined, so that the rigidity and high reaction activity of epoxy resin and the flexibility and toughness of polyurethane are combined through molecular design, and a hyperbranched interpenetrating network structure is constructed; effective improvements are achieved in the aspects of solving the surface inertia of the carbon fiber and improving the balance between the interface bonding strength and toughness of the composite material.

The utility model discloses a kind of automobile body side structure, it is related to automobile parts technical field, including side wall, the inner wall of side wall is fixedly connected with reinforcing rib, the inner wall of side wall is installed with sound insulation cotton, the side wall of side wall is fixedly connected with guide rail.The utility model is provided with side wall, reinforcing rib and sound insulation cotton, by the reinforcing rib of honeycomb shape being set, honeycomb reinforcing rib is supported by grid element mutually, the tensile force, shear force or bending force received is dispersed to multiple grid nodes, and the mechanical transmission path of " multiple point stress - overall bearing " is formed, to improve shear strength, strengthen the protection function of device, in the flexible matrix of using sound insulation cotton, the vibration transmission of side wall can be weakened by damping effect, metal component vibration can be blocked by solid conduction, avoid noise transmission into cabin to provide tranquil cabin environment for driver and passenger.

The application discloses an epoxy resin composite Sn-Bi-Sb lead-free soldering paste and a preparation method thereof, and belongs to the field of soldering materials of metal materials and metallurgy. The epoxy resin composite Sn-Bi-Sb lead-free soldering paste is composed of 3-6% of a mixture of an epoxy resin, a curing agent and an accelerator, 1.5-5.0% of nano silver paste, and the balance of a commercial Sn-Bi-Sb soldering paste. In the mixture of the epoxy resin, the curing agent and the accelerator, the mass percentage of each component in the composition is epoxy resin: curing agent: accelerator = 100: 70-85: 4-9. The epoxy resin composite Sn-Bi-Sb lead-free soldering paste has good wetting and spreading performance, can significantly improve the shear strength and drop resistance of a soldering joint, and can be used for reflow soldering of some products in the electronic industry which have specific requirements for temperature and drop resistance.