1844 results about "Board structure" patented technology

The invention relates to the technical field of printed circuit boards, and discloses a circuit board structure and a preparation method thereof, and the circuit board structure comprises a copper seat, the top of which is provided with a first groove; a chip, wherein the chip is arranged in the first groove; the ceramic substrate layer is arranged at the bottom of the copper seat, and the shape of the cross section of the ceramic substrate layer is the same as that of the bottom surface of the copper seat; the copper plate layer is arranged at the bottom of the ceramic substrate layer, and the shape of the cross section of the copper plate layer is the same as that of the cross section of the ceramic substrate layer. The ceramic substrate layer and the copper plate layer are sequentially arranged at the bottom of the copper base, the thermal resistance of the chip during working can be remarkably reduced, the overall heat dissipation performance can be improved, the cross sections of the ceramic substrate layer and the copper plate layer are consistent with the bottom surfaces of the copper base and the copper plate layer in shape, and the layers are high in structural fitting degree, uniform in stress distribution and good in plate thickness consistency after lamination; and the warping problem of the copper seat caused by thermal expansion is effectively reduced.

The utility model provides a railway non-buried subgrade pile-slab structure of underpass highway bridge, including: two rows of pile foundations, set up in the top of two rows of pile foundations, lay on the support beam on the bearing plate and set up in the ballastless track structure on the bearing plate, the two rows of pile foundations are correspondingly set up along railway subgrade and pass through highway bridge down, the ballastless track structure is set up in the ballastless track structure, the ballastless track structure is set up on the ballastless track structure, the ballastless track structure is set up on the ballastless track structure, the ballastless track structure is set up on the ballastless track structure. Wherein the pile foundations located below the highway bridge are arranged between the existing bridge piers; the two ends of each joist are arranged on the opposite pile foundations of the two rows of pile foundations; the bearing plate is used as the railroad bed and is arranged corresponding to the two rows of pile foundations; and each bearing plate is arranged corresponding to the ballastless track structure. By means of the roadbed structure, the problems that effective clearance of an existing roadbed structure is prone to being limited, the construction period is long, and additional settlement deformation is generated due to the fact that a fill roadbed generates additional loads on existing highway bridge piers can be solved.

The utility model belongs to the technical field of test boxes, and particularly relates to a high-low temperature test box with uniform heating. Comprising test cavities which are arranged in a test box at intervals left and right; a placement net plate is embedded in the bottom of the test cavity; the fans are arranged below the placing net plate in a bilateral symmetry manner; the air inlet end of the fan is communicated with the test cavity through the placing screen plate, and the air outlet end of the fan is communicated with the air duct cavity; the air duct cavities are distributed on the left side wall and the right side wall of the test cavity in a bilateral symmetry manner; a spoiler is vertically and obliquely arranged in the air duct cavity, and an air distribution plate is arranged at the air return end of the air duct cavity. According to the utility model, through the arrangement of the spoiler and the air distribution plate in the air duct cavity, high and low temperature airflow with uniform airflow distribution can be provided for the interior of the test cavity, so that the temperature rise rates of different areas are consistent, and the uniform heating effect during product testing is further improved.

The invention provides a basement large plate structure steel plate overlapping reinforcing structure and a construction method, and relates to the field of structural engineering.The basement large plate structure steel plate overlapping reinforcing structure comprises a large plate structure plate reinforcing structure which is connected to the lower portion of an original concrete plate and located in a large plate structure plate reinforcing area. The large plate structure plate reinforcing structure comprises a prefabricated newly-added concrete structure which is prefabricated and poured on the upper portion of a reinforcing steel plate, and a notch is reserved in the upper end of the prefabricated newly-added concrete structure; the reinforcing steel plate is arranged on the lower portion of the prefabricated newly-added concrete structure, and interface connection between the reinforcing steel plate and the prefabricated newly-added concrete structure is further achieved through the shear connector. The connecting steel bars are arranged on the reinforcing steel plates; the mortar layer is arranged on the upper surface of the convex part of the prefabricated newly-added concrete structure; the cast-in-place newly-added concrete is arranged at the notch; and the tensile steel bars are partially embedded in the original concrete slab and are partially embedded in the cast-in-place newly-added concrete. The original large plate structure can be reinforced conveniently, quickly, economically and reasonably, the bearing capacity of the structure is improved, and the durability of the structure is enhanced.

The utility model belongs to the technical field of vehicle-mounted accessories, and provides a handrail with a table board structure and a vehicle, the handrail comprises a handrail body, a table board, a table board and a table board, the connecting rod assembly comprises a first end and a second end, and the first end is rotationally arranged in the containing cavity; the table board assembly comprises a main table board and an auxiliary table board, and the auxiliary table board is rotationally connected with the main table board and can be switched between a folding position and a maximum unfolding position on the main table board; and the transmission assembly is arranged between the main table plate and the second end. Compared with the prior art, the folding and unfolding type armrest has the advantages that the auxiliary table board of the table board assembly is driven by the transmission assembly to be folded and unfolded relative to the main table board, and on the premise that the effective supporting area of a table top of the table board assembly is not reduced, the required storage space is smaller when the table board assembly is located at the storage position, so that the space occupied by the whole armrest is smaller.

The invention discloses a prefabricated heat preservation groove type plate floor slab system of an assembly type steel structure trestle, and relates to the technical field of groove type prefabricated heat preservation floor slabs, the prefabricated heat preservation groove type plate floor slab system comprises an anti-skid face plate and a heat preservation bearing mechanism, the heat preservation bearing mechanism is arranged at the bottom of the anti-skid face plate, the heat preservation bearing mechanism comprises a plurality of sealing plates, and the sealing plates are arranged in the anti-skid face plate. The multiple sealing plates are arranged and located at the bottom of the anti-skid panel, multiple second supporting blocks are arranged at the bottoms of the sealing plates, groove-shaped plates are arranged on the outer sides of the multiple second supporting blocks, structural blocks are integrally formed through pouring and extruding, reinforcing strips are arranged on the inner walls of the structural blocks, and the structural blocks and annular hoops form a two-way constraint combined framework which can bear bending moment and shearing force; therefore, the bending resistance, the shearing resistance, the torsional rigidity and the overall bearing capacity of the plate body are improved on the premise that heat preservation is not affected on the whole, the engineering problems are avoided, and normal construction work and construction time are maintained.

The present invention relates to the technical field of bridge engineering. Particularly disclosed are a steel shell-concrete composite orthotropic bridge deck structure and a fabrication method and device. The steel housing-concrete composite orthotropic bridge deck structure comprises a steel shell structure, infilled concrete, longitudinal and transverse stiffening ribs arranged at the bottom of the steel shell structure, and a deck-end connecting structure, wherein the steel shell structure comprises an upper steel plate and a lower steel plate that are arranged in parallel, and a plurality of perforated T-shaped ribs arranged in parallel in a longitudinal direction. Webs of the perforated T-shaped ribs are welded to the upper steel plate, flanges are riveted to the lower steel plate, the upper steel plate and the lower steel plate are connected into the steel shell structure, and reinforced concrete tenons formed by the perforated T-shaped ribs and core bar reinforcements and shear bolts anchor the upper steel plate and the lower steel plate in the infilled concrete to form a steel shell-concrete composite deck that bears loads jointly. The present invention provides high bending stiffness, solves the problem of fatigue at welds between the stiffening ribs and a steel top plate, fully utilizes the properties of a steel shell and concrete, and solves the problems of the crackability under a negative bending moment and excessive weight of a traditional composite bridge deck.

The invention discloses a high-altitude jig-frame-free construction method for a daylighting roof of a string folded plate structure, which comprises the following steps of: transversely erecting a box-shaped support beam between building main body structural beams below the middle part of the span of the daylighting roof, and arranging a plurality of cushion blocks on the box-shaped support beam corresponding to a main beam of a daylighting roof steel structure, therefore, an aerial supporting platform used for supporting the middle area of the main beam is formed. The box type supporting beams are transversely erected below the middle of the span of the daylighting roof and between the building main body structural beams, the cushion blocks are arranged to form an aerial supporting platform, a traditional floor jig frame erected from the ground is replaced, and the problem that a floor support cannot be erected under the condition that the space below the daylighting roof is suspended or the daylighting roof is put into use is solved; meanwhile, interference to other procedures in the lower space is avoided; high-altitude in-situ scattered splicing is carried out by taking a main beam supported by an aerial supporting platform as a support, so that a string-folded plate system has enough temporary rigidity and a stable initial configuration before a stay cable is tensioned.

A fastener setting tool for installing a fastener into a board structure, comprising a tool body having a bottom surface and a longitudinal axis; a spacer assembly, comprising a first abutment member, having a first engagement surface, and a second abutment member, having a second engagement surface opposingly spaced apart from said first engagement surface, each one of said first and second abutment member extending away from and in a direction normal to said bottom surface of said tool body, said spacer assembly being configured to cooperatingly positioningly engage the board structure; at least one fastener guide operably coupled to any one of said first and second abutment member, and configured to guidingly receive a fastener for the board structure; and a spacer adjustment mechanism, adapted to selectively lockingly move at least one of said first and second abutment member in a direction along said longitudinal axis.

This invention provides a method for constructing a sidewall without tie rods using interlocking pile support in open-cut tunnels. The method includes: setting foundation pre-embedded bolts; pouring foundation concrete; binding sidewall reinforcement; installing sidewall steel panels and supporting trusses; installing and debugging the sidewall formwork support system; installing and testing the anti-buoyancy system; installing and debugging a multi-target distance sensing steel formwork deformation monitoring system; pouring sidewall concrete; and treating construction joint waterproofing. This invention solves the problem of limited construction space for formwork trolleys in local tunnel construction sections by optimizing the formwork structure system. Compared to traditional large-volume steel formwork installation, it offers lower material costs, more flexible installation and adjustment, and superior anti-buoyancy stability, significantly improving the overall construction progress. Simultaneously, the operational efficiency of the construction joint waterproofing and formwork deformation monitoring system is also significantly improved. This construction technology demonstrates multiple technical advantages in practical applications, including high quality, high efficiency, and high returns, with outstanding application results.

The utility model relates to the technical field of scaffold boards, and discloses a building scaffold board structure with high bending resistance, which comprises a frame body, grooves are respectively arranged on the inner walls of the front side and the rear side of the frame body, a plurality of reinforcing strips are fixedly arranged between the two grooves at equal intervals, and a bearing plate is placed on the plurality of reinforcing strips. Positioning insertion holes are formed in the wall faces of the front end and the rear end of the bearing plate correspondingly, mounting bins corresponding to the two positioning insertion holes are formed in the front end and the rear end of the frame body correspondingly, and movable sliding plates are slidably connected into the two mounting bins correspondingly. The pull block is pulled, the pull block drives the sliding rod to move, the sliding rod drives the movable sliding plate and the insertion plate to move together, the insertion plate is moved into the installation bin, at the moment, the reset spring is compressed, then the bearing plate is placed on the multiple reinforcing strips in the frame body, then the pull block is loosened, and under the rebound effect of the reset spring, the bearing plate is fixed. And the sliding plate and the insertion plate are moved to return to original positions, and at the moment, the insertion plate is successfully inserted into the positioning insertion hole to limit and fix the bearing plate.

The utility model discloses a panel structure, a tray panel splicing assembly and a splicing frame, and belongs to the technical field of trays. The panel structure comprises a middle supporting part, edge supporting parts arranged on the left side and the right side of the middle supporting part and a bearing platform part connected with the middle supporting part and the edge supporting parts, and the middle supporting part, the bearing platform part and the edge supporting parts are integrally formed and prepared by bending a steel plate. The tray panel splicing assembly comprises the panel structure, a barrier strip and a protective plate, and the tray panel splicing assembly is formed by resistance welding of the panel structure, the barrier strip and the protective plate. The tray splicing frame comprises the tray panel splicing assembly and further comprises bottom leg assemblies, and a plurality of sets of bottom leg assemblies are arranged on the lower side of the tray panel splicing assembly. The utility model has the advantages of high strength, high bearing capacity, long service life, low maintenance, flexibility, multiple purposes, environmental protection, sustainability and the like, is light, durable and reusable, and has very high practical value.

The utility model discloses a large-size cast-in-place concrete splicing formwork. The large-size cast-in-place concrete splicing formwork comprises a formwork body, a plurality of hanging rods and a plurality of sets of splicing assemblies. The plurality of hanging rods are vertically arranged and are fixed on the inner side plate surface of the template body at equal intervals; the lifting rod comprises a longitudinal beam and a lifting lug arranged on the top side of the longitudinal beam; the splicing assembly is composed of an outwards-convex connecting part, an inwards-concave connecting part and a fastening connecting piece. The outwards-convex connecting parts and the inwards-concave connecting parts of the multiple sets of splicing assemblies are arranged on the edges of the left side and the right side of the formwork body at intervals in a one-to-one correspondence mode and fixedly connected in an embedded fit mode. According to the formwork, the suspenders and the splicing assemblies are additionally arranged, so that the structural strength of the formwork and the bonding strength of the formwork and concrete are enhanced, and deformation during later concrete pouring is avoided; and meanwhile, rapid and gapless high-quality connection of the two formworks can be achieved through the splicing assembly, and the problem of grout leakage during later concrete pouring is effectively avoided.

The present invention discloses a circuit board structure comprising: a first cavity having a horizontal cross-section size of S1 and a vertical depth of h1; a second cavity having a horizontal cross-section size of S2 and a vertical depth of h2; a T-shaped copper coin comprising a SMALL PART inserted into the first cavity and a BIG PART inserted into the second cavity; a first step groove having a width Δr and a depth Δh (Δh<h1) formed along an upper inner wall perimeter of the first cavity; a second step groove having a width Δr and a depth Δh (Δh<h2) formed along a lower inner wall perimeter of the second cavity; and a sealing material sealed in the first step groove and second step groove, and an air drain hole connecting a gap formed in the second cavity on a horizontal plane of the BIG PART.

A composite laminated layup panel structure suitable for wing combined connection, comprising a main box section skin (100) and a plurality of stiffeners (200) which are integrally cured and formed. The main box section skin is sequentially provided with recesses (300) at a front edge and a rear edge, forming a front recessed edge (110) for overlapping with a leading edge skin (400) and a rear recessed edge (120) for overlapping with a trailing edge skin. A front spar stiffener (600) configured to be connected to a front spar web (500) is fixedly arranged at the bottom of a transition region between the front recessed edge (110) and a main box section skin main body. A rear spar stiffener (700) configured to be connected to a rear spar web is fixedly provided at the bottom of a transition region between the rear recessed edge (120) and the main box section skin main body. The panel structure simplifies connection forms of panels and related structures, reducing the number of parts, improving assembly efficiency, and also facilitating disassembly and replacement maintenance during aircraft use and maintenance.

The present disclosure is a three-dimensional wired circuit board structure, including a bottom board, the bottom board having a first slot and a first pin thereon; a function board, the function board having a second pin and a third pin thereon; and a bridge board, the bridge board having a second slot and a fourth pin thereon. The bottom of the function board is inserted into the second slot and the second pin is connected to the fourth pin, so as to form a combined function module. The combined function module is inserted into the first slot, and the third pin is connected to the first pin.

The utility model relates to a cabinet body assembling structure technical field, concretely relates to a kind of metal cabinet body mortise and tenon assembling structure, including fixed angle plate and tenon plate, tenon plate is fixed on the outside of fixed angle plate, fixed angle plate is the integrated structure of three groups of support plate, and the middle part of support plate is provided with inner groove, and circular groove is provided with on the outside of inner groove, and tenon plate is fixed in inner groove and circular groove, and tenon plate includes panel and the convex head fixed in the front end of panel, convex head is fixed and is set with inner groove, the middle part of convex head is fixed with round head, and round head is set in circular groove, and fixed locking is realized by nut, the function of splicing combination is realized, and the inner groove and circular groove structure, which are provided on the back of support plate, are fixedly connected between tenon plates, form support surface structure, and T type multiple support plate structures on fixed angle plate can be used to fix tenon plate structures in different directions, facilitate the combination of tenon plate into cabinet body structure, and fixed connection is realized between tenon plates by screw rod and nut.

The invention provides a plate structure storage type chair, and relates to the technical field of plate structure chairs, the plate structure storage type chair comprises a support frame, a lower support plate is arranged at the lower part between the inner walls of the two sides of the support frame, an upper support plate is arranged at the upper part between the inner walls of the two sides of the support frame, and a hinge plate is arranged between the top of the lower support plate and the bottom of the upper support plate; the top of the upper supporting plate needs to slide to the top face in the supporting frame during storage, the lower supporting plate can be driven to slide during sliding, the upper supporting plate and the lower supporting plate are in a horizontal state after storage, the upper supporting plate and the lower supporting plate are in a horizontal state, the upper supporting plate and the lower supporting plate are in a horizontal state, and the supporting frame is convenient to use. The upper supporting plate and the lower supporting plate are arranged in the supporting frame and located in the supporting frame, and one end of the bent plate is clamped in a positioning groove in the top of the upper supporting plate, so that the upper supporting plate and the lower supporting plate are integrally in a plate shape after being stored in the supporting frame, and overlying conveying is facilitated.

In a general aspect, a multilayer board structure is used to mechanically support and electrically connect a quantum processing unit. In some aspects, a multilayer board structure includes a stack of printed circuit boards. Each printed circuit board in the stack includes a dielectric substrate, a copper layer on a surface of the dielectric substrate; and a superconductive layer electroplated on a surface of the copper layer such that the copper layer is sandwiched between the superconductive layer and the dielectric substrate.

The utility model discloses a portable bluetooth sound box with running marquee, including sound box body, the sound box body includes the casing, is provided with the handle on the casing, the front of casing is provided with running marquee group, the running marquee group includes the multiple light emitting units of vertical direction setting in proper order, the light emitting unit includes the light -transmitting casing part and the multicolor lamp pearl of setting in the light -transmitting casing part, the light -transmitting casing part is the V type board structure of horizontal placement, including the upper inclined light -transmitting board and the lower inclined light -transmitting board of integrative connection, the utility model is provided with running marquee group, and the light -transmitting casing part of running marquee group is the V type board structure of horizontal placement, can let the light of multicolor lamp pearl emit scattering to different angle, can expand the coverage of light, makes the light effect of running marquee more with the sense of layers and stereoscopic sense, brings the user more rich, more cool light experience on the vision, enhances the attraction of product.

The utility model discloses an environment-friendly corrugated board production turning plate structure which comprises a bottom plate, the top face of the bottom plate is fixedly connected with a supporting plate, the top face of the bottom plate is fixedly connected with a limiting baffle, the top face of the bottom plate is fixedly connected with a limiting frame, and a conveying assembly is started to drive a paperboard to move to the position below the limiting frame. An electric push rod is started to push a clamping frame to clamp and fix a paperboard, a driving assembly is started to drive a lifting mechanism to rotate, through threaded connection in the lifting mechanism, a limiting sliding block, the electric push rod, the clamping frame and the paperboard are driven to move upwards to be separated from a conveying assembly, and a turnover mechanism is started to drive the electric push rod, the clamping frame and the paperboard to rotate to complete board turnover work. And the lifting mechanism and the electric push rod are reset, so that the paperboards can be placed on the conveying assembly again for conveying work, the aim of conveniently and automatically turning the corrugated paperboards is achieved, and the problem that the working intensity of workers is greatly improved due to the fact that existing board turning work is manually conducted is solved.

The utility model discloses a kind of ceiling board structure based on ventilation system, belong to ceiling ventilation technical field, comprising: cross frame body and air supply pipeline;Multiple square grid ports formed by the cross frame body are all fixedly provided with ceiling, multiple air holes are opened in the outer wall of the ceiling, the outer wall of the cross frame body is detachably connected with dust cover by screw in the periphery of each ceiling, the top of the ceiling is provided with switch mechanism, the outer wall of the air supply pipeline is provided with multiple shunt mechanism, the utility model is controlled by setting switch mechanism and electromagnetic valve shunt mechanism, the air hole of each ceiling can be independently controlled to open or close, airflow can be accurately delivered to target area, flexibly adjust according to requirement, and cross frame body is well-type grid structure, air supply pipeline, ceiling, shunt mechanism, dust cover are detachable modular design, conducive to standardization production and construction.

The invention discloses a testing device and a testing method for a cut-off end of a stringer of a wallboard structure of a high-load aircraft. The testing device and the testing method are suitable for testing the mechanical property of a wallboard test piece comprising a skin and at least one stringer cut-off end. According to the device, lateral supporting assemblies are arranged on the two sides of a test piece, lateral constraint is provided for the wallboard test piece, axial relative displacement is allowed, and the single stringer wallboard test piece is used for equivalently simulating simple support boundary conditions on the two sides of an actual stiffened wallboard; the lateral supporting assembly comprises an L-shaped base, a connecting flat plate and a sliding supporting piece, the L-shaped base is connected with the testing machine through bolts, and the sliding supporting piece abuts against the side edge of the wallboard testing piece to form lateral supporting; according to the optimal position of the sliding supporting piece, a single stringer wall plate test piece obtains the maximum bearing capacity and the damage form which are consistent with those of a plurality of stringer wall plate test pieces under the action of a tensile load in a lateral supporting mode.

The utility model discloses a kind of hydraulic pressure bearing plate structures of pile foundation static load detection, comprising: bearing plate main body, the upper end of the bearing plate main body is provided with multiple angle plates of uniform distribution, the upper end of the bearing plate main body is contacted with hydraulic jack, the outside of the bearing plate main body is provided with the measuring assembly for measuring the position of hydraulic jack;The outside of the bearing plate main body is provided with the mounting assembly for installing measuring assembly, the utility model is measured by being provided with the measuring assembly for measuring the position of hydraulic jack, measuring assembly adopts modularization design, can be quickly adjusted mounting position according to different specifications bearing plate, adapt multiple models of hydraulic jack, simultaneously avoid the difficulty of manual installation, realize accurate position measurement and ensure the accurate installation positioning of hydraulic jack, avoid the problem of uneven pressure distribution due to installation deviation, provide reliable basis for data acquisition.

The utility model discloses a three-dimensional pool inner wall structure, the bottom of an inner wall main body is fixed on a pool raft plate or a floor, the side of the inner wall main body is vertically connected with an outer wall, the outer wall is provided with a guide wall, an outer wall construction joint is arranged between the outer wall guide wall and an outer wall main body, and a water stop steel plate is arranged in the outer wall construction joint. An inner wall construction joint is arranged between the inner wall main body and the pool raft or floor, a vertical construction joint is arranged between the inner wall main body and the outer wall guide wall, continuous water-swelling water-stopping strips are arranged in the vertical construction joint and the inner wall construction joint, the water-swelling water-stopping strips extend into the outer wall construction joint, and the water-swelling water-stopping strips extend into the outer wall construction joint. And the end part is tightly attached to the water stop steel plate. According to the utility model, the pre-embedded water-swelling waterstop strip is used for replacing the traditional guide wall and waterstop steel plate structure, so that the construction process is simplified, and the seepage-proofing effect is improved.

The application relates to the technical field of handles, and discloses a handle, which comprises a lock body, a square rod is slidingly inserted into the inside of the lock body, mounting rods are fixedly connected to the two sides of the square rod, a sleeve ring is slidingly sleeved on the outer circumferential surface of each mounting rod, a mounting plate is slidingly sleeved on the outer circumferential surface of each mounting rod, and a handle is fixedly connected to the top end of each mounting plate. The handle is characterized in that the mounting plate is directly fixed on the mounting rods at the two ends of the square rod by rotating the lead screw to drive the positioning rod to move and be inserted into the positioning hole, the handle is convenient to install, disassemble and maintain, manpower is saved, the handle is prevented from being fixed on the door plate by using screws, damage to the door plate is prevented, the appearance of the door plate and the reuse after subsequent disassembly are not affected, and the problems that the handle and the door plate are fixed by using screws, the disassembly and maintenance are relatively laborious, the screws cause damage to the structure of the door plate, the appearance of the door plate is affected, and the reuse after subsequent disassembly is affected are solved.

This utility model belongs to the field of outdoor seating technology, specifically relating to an outdoor metal chair. It includes two support components distributed along a first direction and arranged opposite to each other; a seat structure disposed between the two support components and extending along a second direction perpendicular to the first direction; and two support components located at the lower ends of the seat structure, different from the two sides connected to the support components. It also includes at least one cleaning component. The cleaning component includes a fixed plate located at the upper end of the seat structure and parallel to its upper surface; a cleaning block disposed on the fixed plate; and two sliding plates disposed at both ends of the fixed plate and slidably connected to the two support components respectively. This utility model, while ensuring the supporting effect of the seat, allows the cleaning component to slide smoothly on the seat, making the outdoor metal chair compatible with support, cleaning effect, and aesthetics.

The utility model belongs to the technical field of building boards, and particularly provides a fireproof high-strength hydrophobic composite board structure which comprises a fiber reinforcement layer. Hydrophobic layers are arranged on the upper surface and the lower surface of the fiber reinforced layer; the hydrophobic layer comprises a floating bead plate and a hydrophobic film; and the hydrophobic film wraps the pore surface of the floating bead plate. According to the fire-resistant high-strength hydrophobic composite board structure provided by the embodiment, through the synergistic effect of all the layers, the light fire-resistant and heat-insulating performance of the floating beads can be achieved, and water can be prevented from permeating into the composite board structure through the surface or capillary action through the hydrophobic films on the upper surface and the lower surface when the composite board structure is in a humid environment or is corroded by water. Besides, by means of the fiber reinforcing layer with a fiber net laid in the middle, the overall strength and bearing capacity of the board can be improved, the service life of the composite board is prolonged, the composite board is suitable for public places such as office buildings, hotels, restaurants, movie theaters, markets, hospitals and underground parking lots needing fire-fighting smoke exhaust air pipes, and the structural safety is high.

The utility model relates to the technical field of seat storage, and discloses a storage type writing board structure, including handrail, support seat, rear swing arm, front swing arm and writing board, the rear swing arm is sleeve structure, and the rear end of front swing arm inserts inside rear swing arm and is equipped with pivot on the rear end of front swing arm, is equipped with the slide groove that supplies pivot to extend on the circumference wall of rear swing arm, is equipped with torsional spring in rear swing arm, and forms the spacing boss on support seat. The storage type writing board structure provided by the utility model can rotate the front swing arm to get rid of spacing, swing the rear swing arm and the front swing arm together, and lower the swing mode when the seat is folded and laid flat, and the design of maintaining the writing board flat and close to the handrail with the help of torsional spring overcomes the defect that the overall thickness of the seat is too large and the limited space between the steps cannot be adapted due to the inadaptability or unreasonable folding structure of the traditional writing board, ensures that the retractable stand seat will not be interfered by the writing board structure when being recycled, and improves the space utilization of the retractable stand.