84 results about "Polytetrafluoroethylene sheet" patented technology

The invention relates to a surface-coated oxide solid electrolyte and a preparation method thereof, the surface-coated oxide solid electrolyte comprises an oxide electrolyte and a surface coating layer, the chemical formula of the oxide solid electrolyte is Li7-xLa3Zr2MxO12-x (M = Ta, Nb, Hf, Ge, Sc, Ti, Al, Si, Sn, Y, 0 < = x < = 1), the chemical formula of the surface coating layer is LiXON (R = Ta, Nb, Al, Zr, Ga, In, N = F, Cl, Br, I), and a lithium source, a lanthanum source, a zirconium source, an M source, an X source and an N source, or an XN source are connected in series, garnet solid electrolyte powder with a stable surface coating layer is obtained by adopting a solid phase method or a sol-gel method and combining a low-temperature calcination process; and then mixing and reacting with a lithium salt and a polymer electrolyte, and pouring the obtained slurry on a polyfluortetraethylene plate to prepare the composite electrolyte. Compared with the prior art, the high-ion conductor layer formed on the surface of the product in situ constructs a rapid transmission channel for lithium ion transmission in the composite electrolyte, and high ion conductivity is achieved.

The invention relates to a synthesis method of spiny MgF2 (at) ZnO heterojunction nanofibers for a lithium metal solid electrolyte, and belongs to the technical field of all-solid-state lithium batteries. The preparation method comprises the following steps: (1) preparation of a MgF2 nanofiber precursor: obtaining primary MgF2 nanofibers by adopting an electrostatic melting and blowing process; (2) preparation of MgF2 nanofibers: calcining the precursor nanofibers through a temperature programming method to obtain MgF2 inorganic nanofibers; (3) preparation of spiny MgF2 (at) ZnO heterojunction nanofibers: growing regular array ZnO nanowires on the MgF2 nanofibers through a hydrothermal reaction; and (3) preparation of the composite solid electrolyte: introducing the MgF2 (at) ZnO heterojunction nanofiber into a PEO-LiTFSI solution, pouring on a polyfluortetraethylene plate, and drying and hot-pressing for a certain time to obtain a solid electrolyte diaphragm which can be applied to an all-solid-state lithium metal battery.

The present invention belongs to the technical field of rotating bridge construction, and specifically relates to a device and method for controlling the posture of an unbalanced rotating cable-stayed rotating bridge. The device comprises a circular slideway disposed between an upper rotating body and a lower rotating body; a sliding assembly, eight of which are evenly arranged on the slideway. The sliding assembly comprises: a footboard disposed below a beam; a sliding steel pad disposed in the forward direction of the bottom of the footboard; and a polytetrafluoroethylene plate disposed between the slideway and the sliding steel pad. While being able to fully control the posture of the bridge during rotation, the present invention overcomes the problems existing in conventional operating methods, achieving a smooth rotation of the bridge at minimal cost and in the simplest operating method.

The invention relates to the technical field of tetrafluoroethylene straight pipe forming, in particular to a steel lining polytetrafluoroethylene straight pipe isobaric forming device and method.The steel lining polytetrafluoroethylene straight pipe isobaric forming device comprises a machining pipe frame, the outer surface of the center of the machining pipe frame is sleeved with a center sleeve base, and a center frame is arranged in the center of the machining pipe frame; first air uniformizing valves are arranged at the four corners of the side face of the center frame, air uniformizing angle seats are fixedly connected to the four corners of the side face of the machining pipe frame, limiting ring seats are fixedly connected to the two ends of the machining pipe frame, and an annular air bag sleeve is arranged on the inner wall of the machining pipe frame. According to the equipment, through the arrangement of the machining pipe frame, the first connecting base, the second connecting base and the electric push rod, the equipment can conduct more efficient isostatic pressing forming on the steel lining polytetrafluoroethylene straight pipe, in the actual use process, a worker firstly places the straight pipe needing to be lined with polytetrafluoroethylene into the machining pipe frame, and then the straight pipe needing to be lined with polytetrafluoroethylene is placed into the machining pipe frame; and then the upper polytetrafluoroethylene plate and the lower polytetrafluoroethylene plate which are in arc-shaped butt joint are inserted into the second butt joint seat.

The invention discloses a low-dielectric optical transparent adhesive film and a preparation method thereof, and relates to the field of adhesive films. When the low-dielectric optical transparent adhesive film is prepared, nano silicon dioxide sequentially reacts with 2-(4-chlorosulfonylphenyl) ethyltrimethoxysilane and 2, 2 ', 4, 4'-tetrahydroxybenzophenone, and modified silicon dioxide is prepared; the modified silicon dioxide, 4-vinylpyridine, allyltrimethoxysilane, 2-ethylhexyl acrylate, butyl acrylate, hydroxyethyl acrylate, diallyl phosphate and isophorone diisocyanate are subjected to a reaction, then ferric chloride is added, a polytetrafluoroethylene plate is coated and cured, and an adhesive film matrix is prepared; and carrying out surface treatment on the adhesive film substrate by using dimethoxydimethylsilane to prepare the low-dielectric optical transparent adhesive film. The low-dielectric optical transparent adhesive film prepared by the invention has flame-retardant, durable and waterproof capabilities.

The utility model provides a novel support structure, and relates to the technical field of bridge engineering, the top of a support lower steel plate is fixedly connected with a rubber support, the top of the rubber support is provided with a polyfluortetraethylene plate, and the top of the polyfluortetraethylene plate is fixedly connected with a support upper steel plate. According to the rubber support, under the interaction of all the components of the device, efficient protection treatment of the support structure is achieved, it is ensured that the support structure can still effectively isolate invasion of moisture, dust and harmful substances in the severe environment, therefore, the mechanical property stability of the rubber support is maintained, the service life of the rubber support is remarkably prolonged, and meanwhile the service life of the rubber support is prolonged. According to the protection assembly, the protection effect is guaranteed, meanwhile, balance of gas pressure inside and outside the protection assembly is achieved, the crucial environmental condition is provided for long-term stable operation of the rubber support, and therefore the reliability and durability of the rubber support are guaranteed.

This invention relates to a microwave radiation method for preparing room-temperature phosphorescent polymer films based on polyacrylamide, belonging to the field of organic light-emitting materials. The method involves dissolving acrylamide monomer, ammonium persulfate initiator, and β-diketone ligand in a mixed solvent of water and acetonitrile, placing the solution in a microwave reactor, and polymerizing it under microwave radiation to obtain the polymer. The resulting colloidal solution, dissolved in deionized water, is uniformly coated onto a polytetrafluoroethylene (PTFE) or silicone plate, and dried to obtain the room-temperature phosphorescent polymer film based on polyacrylamide. The prepared polymer film exhibits blue or blue-green fluorescence and a green afterglow. The polymer film containing 4,4,4-trifluoro-1-(2-naphthyl)-1,3-butanedione has an afterglow time of up to 7.5 seconds. The raw materials of this invention are readily available, the preparation method is simple, convenient, and rapid, requiring no inert gas protection, the solvent does not require treatment, polymerization can be completed in minutes, and the obtained material is non-toxic, non-polluting, free of heavy metals and halogens, has good water solubility, and has broad application prospects.

The utility model provides a kind of positioning device of polytetrafluoroethylene board. The positioning device of polytetrafluoroethylene board is used to be installed on saw bench, comprising: pressing structure, the saw bench surface is opened with saw groove, the saw bench surface is opened with two before and after distribution guide groove in the left side of the saw groove, the inside sliding connection of the guide groove has connecting piece, the bottom of two the connecting piece is equipped with adjusting structure, the top of two the connecting piece is fixedly connected with movable positioning block, the pressing structure is installed in the surface of movable positioning block, the pressing structure includes guide rail, the guide rail is located in the left side of movable positioning block and guide rail bottom and two connecting piece between fixed connection, the positioning device of polytetrafluoroethylene board provided by the utility model has the advantage that user can quickly complete positioning block position adjustment, and board can be stably fixed simultaneously.

The invention discloses a self-resetting eddy current friction composite damping vibration double-control seismic isolation device and application thereof. The device comprises a top plate, an array thick rubber body is arranged below the top plate, a permanent magnet set is annularly installed along the thick rubber body, and a polyfluortetraethylene plate is embedded in the lower surface of the thick rubber body; the lateral surface of the top plate is provided with a protective cylinder which is internally provided with a transverse reset spring; polytetrafluoroethylene plates are arranged on the inner surfaces of the vertical baffles, two sliding blocks are arranged on the inner surfaces of the vertical baffles, the sliding blocks are connected through vertical reset springs, and the sliding blocks are hinged to the corresponding protective cylinders through connecting rods. A high-transmittance acrylic plate is mounted between every two adjacent baffles; a copper plate is laid on the upper surface of the base plate. Composite damping cooperative energy consumption is achieved through horizontal friction-eddy current damping and vertical friction, the vertical and horizontal three-dimensional shock isolation function is achieved through the array thick rubber body, and cooperative reset is achieved through the horizontal springs and the vertical springs.

The invention discloses a composite solid-state electrolyte, a preparation method thereof and a solid-state lithium metal battery, and the method comprises the following three steps: preparation of bismuth oxyiodate nanoparticles, preparation of lithium lanthanum titanium oxide nanorods and preparation of the composite solid-state electrolyte, the preparation method comprises the following steps: dissolving lithium bis (trifluoromethanesulfonimide) LiTFSI and polyvinylidene fluoride (PVDF) into N, N-dimethylformamide to obtain a first mixed solution, respectively weighing bismuth oxyiodate powder and 0.1 g of lithium lanthanum titanium oxide nanorods, adding the weighed bismuth oxyiodate powder and 0.1 g of lithium lanthanum titanium oxide nanorods into the first mixed solution, carrying out ultrasonic treatment and stirring to obtain a second mixed solution, pouring the second mixed solution into a polytetrafluoroethylene plate, and carrying out ultrasonic treatment to obtain the bismuth oxyiodate / lithium lanthanum titanium oxide composite material. And drying in vacuum to obtain the composite solid electrolyte, wherein the mass fraction of the bismuth oxyiodate powder in the second mixed solution is 5-20%. The invention solves the technical problems of low ionic conductivity and lithium dendrite growth of the solid electrolyte in the prior art.

The application provides a heat insulation door, which comprises a chamber, two mounting plates are fixedly mounted on the top surface of the chamber, a supporting hole is formed in one side of the mounting plate, and a bearing is fixedly sleeved in the supporting hole; and a folding assembly is arranged in the chamber and used for folding the heat insulation plate, a first steel cable is pulled by rotating a driving motor, the heat insulation plate is folded and contracted under the linkage of a first silicon rubber strip and a second silicon rubber strip, the chamber is opened, the heat insulation plate occupies a small space when being opened, the space occupation of the central isolation chamber is greatly reduced, a contraction cavity does not need to be added on the chamber, the heat insulation effect is ensured, the heat insulation plate is a polytetrafluoroethylene plate, has the excellent characteristics of high and low temperature resistance and strong heat insulation capacity, the reflecting layer is an aluminum foil, heat transfer caused by radiation in the chamber is reduced, and heat dissipation is reduced.

The invention discloses a cylindrical cavern energy storage structure lining tank mounting method, and relates to the field of tunnel construction. The installation method of the cylindrical cavern energy storage structure lining tank comprises the following steps that at least two rows of sliding supporting bosses arranged at intervals in the length direction of a cavern are arranged at the bottom of the cavern, and polyfluortetraethylene plates are arranged at the tops of the sliding supporting bosses; a plurality of sliding rails and at least two temporary brackets capable of sliding along the sliding rails are arranged outside the cavern; the lining tank is hung on a temporary bracket to be supported; a pushing mechanism is used for pushing the lining tank to move to the top of each row of sliding supporting bosses along the sliding rails for supporting; and the lining tank is pushed to move to a designed position along each row of sliding supporting bosses. According to the mounting method for the lining tank of the cylindrical cavern energy storage structure, the guide precision of the lining tank during movement can be improved, the situation that the axis of the lining tank deviates too much during long-distance pushing is avoided, and the bottom of the lining tank is prevented from being scratched.

The application discloses a cutting die for expanded polytetrafluoroethylene plate, which comprises a base, a support fixed on the base, a rotating rod penetrating through the support and rotationally connected with the support, the other end of the rotating rod being rotationally connected with the support, a driving mechanism installed on the support and used for driving the rotating rod to rotate intermittently, a through groove arranged at the upper end of the support, a bolt and nut assembly slidably connected in the through groove and capable of being positioned, the bolt and nut assembly being fixedly connected with the upper end of a sliding block, and the rotating rod being sleeved with the sliding block movably connected with the rotating rod. The application can cut the plate at equal intervals without marking the plate by workers, greatly improves the work efficiency, clamps the plate, does not need manual positioning of the plate, increases the stability of the plate, reduces the labor of the workers, and can adjust the position of the cutter to meet the cutting of plates with different lengths and the cutting accuracy.

The utility model discloses a constructional engineering heat distribution pipeline mounting structure with an axial thermal expansion compensation function, and solves the problems that the construction period of a heat distribution pipeline and pedestal mounting structure is long, and the thermal expansion and cold contraction adaptability between a pipeline and a pedestal is poor. The mounting structure comprises a concrete cast-in-place forming foundation, a prefabricated pedestal, a polyfluortetraethylene plate, an elastic restraint strap and a heat distribution pipeline, wherein the prefabricated pedestal is arranged on the concrete cast-in-place forming foundation and is in grouting connection with the concrete cast-in-place forming foundation; the prefabricated pedestal is of a cross-shaped structure, and an arc-shaped through groove consistent with the trend of the heat distribution pipeline is formed in a pedestal body. A polyfluortetraethylene plate is fixedly mounted in the arc-shaped channel; the heat distribution pipeline is arranged on the polyfluortetraethylene plate, an elastic restraint strap is arranged above the heat distribution pipeline, and the two ends of the elastic restraint strap are fixed to the prefabricated pedestal. And the sliding friction between the polytetrafluoroethylene material and the heat distribution pipeline shell or between the polytetrafluoroethylene material and the stainless steel plate avoids the damage to the heat distribution pipeline.

The invention discloses a preparation method of a double-layer composite solid electrolyte membrane, which comprises the following steps: step 1, stirring a polymer matrix, a lithium salt, a solid electrolyte and an organic solvent at 60-90 DEG C for 1-12 hours, and uniformly mixing to prepare a solid electrolyte glue solution A; step 2, adding a polymer matrix, a lithium salt and a side chain type polyion liquid into an organic solvent, and stirring at 60-90 DEG C for 1-12 hours to uniformly mix to obtain a solid electrolyte glue solution B; and 3, uniformly coating a polyfluortetraethylene plate with the solid electrolyte glue solution A, putting the polyfluortetraethylene plate into a drying box, drying at 50-120 DEG C for at least 2 hours, taking out the polyfluortetraethylene plate, forming a diaphragm A on the polyfluortetraethylene plate, uniformly coating the diaphragm A with the solid electrolyte glue solution B, putting the polyfluortetraethylene plate into the drying box, drying at 50-120 DEG C for at least 12 hours, taking out the diaphragm, and peeling off the diaphragm to obtain the double-layer composite solid electrolyte membrane. By adopting the AB double-layer diaphragm structure design, the tensile strength of the whole composite solid electrolyte membrane is enhanced, the interfacial compatibility with a positive electrode is effectively improved, and the interfacial impedance is reduced.

The invention aims to provide the fixing device based on long-distance heat distribution pipeline application, the device is simple in structure, low in cost and convenient to construct, and compared with an existing heat distribution pipeline sliding support, the sliding support slides between the stainless steel plate and the polyfluortetraethylene plate, so that the requirement for guiding sliding between heat distribution pipelines is met.

This invention discloses a high-temperature and low-temperature resistant plastic film and its preparation method, relating to the field of polymer materials. In preparing the high-temperature and low-temperature resistant plastic film, bis(4-fluorophenyl)phosphine oxide is reacted sequentially with acrylonitrile, hydroquinone with 4,4'-difluorobenzophenone, 2,4-dihydroxybenzonitrile, N-(2-aminopropyl)maleimide, and furfuryl isocyanate to obtain functionalized polyetheretherketone (PEEK). Glass fibers are then reacted sequentially with N-(3-trimethoxysilylpropyl)pyrrole, 1-allyl-1H-pyrrole with 1-methylpyrrole, N-(furan-2-ylmethyl)ethylamine, and 1,3-propanesulfonic acid lactone to obtain functionalized glass fibers. The functionalized glass fibers and functionalized PEEK are mixed, coated onto a polytetrafluoroethylene (PTFE) plate, and scraped off to obtain the high-temperature and low-temperature resistant plastic film. The high-temperature and low-temperature resistant plastic film prepared by this invention possesses durability, antibacterial properties, self-healing properties, antistatic properties, and flame retardant properties.

The present invention discloses a method for preparing a super-hydrophobic ceramic membrane by pyrolysis and gasification of a polytetrafluoroethylene film, comprising the following steps: 1) pretreatment of the ceramic membrane element: treating the ceramic membrane element with a strong alkaline solution under ultrasonic conditions, then ultrasonically cleaning it with deionized water until it is neutral, and drying it; 2) heat treatment of the ceramic membrane element: wrapping the pretreated ceramic membrane with a polytetrafluoroethylene sheet, placing it in a high-temperature furnace, introducing a nitrogen source, heating it to 350-450°C at a rate of less than 10°C / min, holding it for 3-10 hours, and then cooling it naturally to obtain a super-hydrophobic ceramic membrane. The present invention transports the low surface energy substances vaporized and decomposed by the polytetrafluoroethylene film at high temperature to all levels of the modified ceramic membrane through a nitrogen source, thereby achieving the purpose of fully hydrophobizing the ceramic membrane. Not only is the super-hydrophobicity of the product high, but the hydrophobically modified ceramic membrane is also resistant to acid and alkali corrosion and high temperatures of 350°C, greatly expanding its scope of application.

This invention discloses a palladium-based catalyst for the semi-hydrogenation of alkynols to enols and its preparation method. Specifically, a metal salt is added to deionized water and ultrasonically dispersed to obtain a uniformly dispersed metal salt solution. A support powder is uniformly spread on a polytetrafluoroethylene plate. The metal salt solution is loaded into a syringe pump and slowly added dropwise onto the support. The solution is allowed to stand and age to obtain a wet support. The wet support is transferred to an oven for calcination. The calcined sample is transferred to a tube furnace for reduction to obtain the palladium-based catalyst. The palladium-based catalyst of this invention can be applied to the selective hydrogenation reaction of alkynols. By controlling the impregnation rate, the active precursor solution is ensured to be absorbed instantaneously and completely, and the enrichment of the active component at the edges is effectively suppressed. High-temperature reduction achieves partial encapsulation of palladium nanoparticles with indium oxide, thereby altering their electronic structure and improving the selectivity for the semi-hydrogenation of alkynols to enols.

The utility model discloses thickness-adjustable polyfluortetraethylene plate cutting equipment, which relates to the technical field of polyfluortetraethylene plate cutting, and comprises a cutting table component and a first adjusting frame group, and adjusting columns are vertically and movably mounted at four opposite angles of the bottom of the cutting table component; the first adjusting frame set is horizontally installed in the middle of the upper portion of the cutting table assembly, and the second adjusting frame sets are horizontally erected on the front side and the rear side of the cutting table assembly correspondingly. According to the thickness-adjustable polyfluortetraethylene plate cutting equipment, through the arrangement of the first adjusting frame set and the structural arrangement of the first adjusting frame set, on one hand, a circular saw can be assisted in adjusting and adapting polyfluortetraethylene plates of different specifications within a certain range, the stability of the polyfluortetraethylene plates during cutting machining is ensured, and meanwhile it can be ensured that in the cutting process of the circular saw, the cutting efficiency of the polyfluortetraethylene plates is improved. And in addition, due to the use of the second adjusting frame set and the limiting plate, side edge limiting is further provided for the cut polyfluortetraethylene plate, and therefore the cutting accuracy is guaranteed.

The application provides an SMA-polyurethane adaptive self-resetting three-dimensional isolation bearing and a design method thereof. The bearing comprises a stainless steel mirror surface at the bottom, a polytetrafluoroethylene plate arranged on the stainless steel mirror surface, and a slotted steel plate arranged above the polytetrafluoroethylene plate; four steel rods are arranged at the four corners of the upper surface of the slotted steel plate; the steel rods, the slotted steel plate and the polytetrafluoroethylene plate are fixed and then placed at the middle position of the stainless steel mirror surface, four hinge bearings are fixed at the four corners of the stainless steel mirror surface for fixing SMA bundles; a plurality of polyurethane damping pads and a plurality of steel plates are stacked on the slotted steel plate in a staggered mode, and the polyurethane damping pads and the steel plates are bonded to each other; a steel sleeve is embedded in the middle of the four steel rods and then placed on the uppermost steel plate, four rotatable pulleys are fixed at the four corners of the uppermost steel plate, and four directional pulleys are fixed at the positions of the uppermost steel plate close to the steel rods, and the four directional pulleys are used for fixing the path of the SMA bundles. The application has the self-resetting property in the horizontal direction while meeting the adaptive vertical stiffness.

The utility model relates to the technical field of polytetrafluoroethylene plate, specifically relates to a kind of polytetrafluoroethylene plate of stable assembly, including polytetrafluoroethylene plate body, one side of polytetrafluoroethylene plate body is equipped with lap plate, the bottom end surface four corners of lap plate are equipped with guide post, one side of guide post is equipped with fastening plate, the other side of polytetrafluoroethylene plate body is equipped with the lap joint of lap plate and is equipped with the lap joint groove of lap plate, the bottom of lap joint groove is equipped with the guide groove of the insertion of guide post and fastening plate in polytetrafluoroethylene plate body, multiple guide grooves are equipped with multiple installation grooves in polytetrafluoroethylene plate body, locking rod is slidably arranged in installation groove. The utility model improves the connecting strength of the butt joint of two polytetrafluoroethylene plate bodies, avoids the fracture of the connecting place of polytetrafluoroethylene plate body connected using glue later.

The invention relates to the technical field of polyfluortetraethylene plate processing, in particular to a polyfluortetraethylene plate continuous processing line and process, which comprises an annular guide rail, and further comprises a mold mechanism mounted on the annular guide rail, and a mold feeding mechanism, a net mounting mechanism and a preliminary forming mechanism which are mounted on the outer side of the annular guide rail and are sequentially arranged in the transfer direction of the annular guide rail; foaming liquid sprayed out first can be slightly thickened in the metal net trimming process, the situation that the metal net deviates from the center of the outer ring mold subsequently is reduced, the position of the metal net is limited through the vertical grooves in the inner ring mold rising process, the situation that the metal net deviates is further reduced, and the service life of the metal net is prolonged. Through precise control of the position of the metal net before foaming, the situation that the metal net deviates from the center of the metal net in a subsequent foaming plate is greatly reduced, and it is ensured that the metal net can serve as an effective functional layer to be successfully embedded into a product.

An inhaul cable dynamic and static weather-proof water tightness test device for bridge engineering relates to the field of water tightness tests and comprises an inhaul cable, an upper anchor head, a test cylinder, a lower anchor head, an axial jack and transverse jacks, and the transverse jacks are symmetrically arranged on two sides of the lower end of the inhaul cable; a bearing frame, a sliding groove plate and a composite sliding plate assembly are sequentially installed between the test bottom and the axial jack, the sliding groove plate is fixed to the bearing frame, and a sliding groove is formed in the sliding groove plate. The composite sliding plate assembly comprises polyfluortetraethylene plate sliding blocks which are connected together, a polyfluortetraethylene plate is in sliding fit with a sliding groove of the sliding groove plate, and the sliding blocks are tightly pressed and attached to the piston end of the axial jack. Piston ends of the transverse jacks are connected with two side end surfaces of the composite sliding plate assembly; a lifting protection device is further installed on one side of the lower anchor head. The test device accords with the actual use working condition of the inhaul cable, the angle of the test device can be conveniently adjusted, reverse overturning of the test cylinder is prevented, and different test temperature requirements can be met.

This invention discloses a replaceable metal damper anti-sway point for a suspended steel inner cylinder of a chimney, comprising a metal damper, an outer chimney cylinder, and an inner chimney cylinder; an anti-sway platform component is provided between the outer chimney cylinder and the inner chimney cylinder, and the anti-sway platform component includes a chimney anti-sway platform beam disposed on the inner side of the outer chimney cylinder and anti-sway platform beam side plates fixedly connected to the chimney anti-sway platform beam. This invention relates to the field of chimney technology for thermal power plants. This replaceable metal damper anti-sway point for a suspended steel inner cylinder of a chimney effectively reduces the chimney's seismic response by using a metal damper as the anti-sway point for the steel inner chimney, thereby saving engineering work and reducing engineering costs. Simultaneously, the metal damper is replaceable, easy to maintain, and has low maintenance costs. Furthermore, by providing polytetrafluoroethylene plates at the ends and sides of the metal damper, the friction with the chimney anti-sway platform beam is reduced.

The utility model provides a fireproof air brake lengthening operation device which comprises a round steel handle, an inner hexagonal bit, a fixing support and a polyfluortetraethylene plate, the fixing support is welded with other equipment supports, one end of the round steel handle is welded with the inner hexagonal bit, the other end of the round steel handle forms a handle structure, the round steel handle is made to be of an L-shaped structure, and the polyfluortetraethylene plate is arranged on the fixing support. The polyfluortetraethylene plate and the fixing support are fixed through self-tapping screws, and the round steel handle penetrates through coaxial round holes of the polyfluortetraethylene plate and the fixing support. The fireproof air brake can be conveniently operated in a narrow space, and can be widely applied to the ship engineering industry.

This invention discloses a multi-directional elastic support bridge bearing mechanism and its usage method, relating to the field of bridge bearings. The invention features friction ring plates on the upper and lower bearing plates, with alternating smooth and rough annular surfaces on the friction ring plates. Multiple raised rings are arranged on the sealing rubber ring, making contact with the smooth annular surfaces. When the bearing is under stress, the raised rings of the sealing rubber ring are restricted by the resistance of the rough annular surfaces, resulting in a more balanced lateral deformation increment on both sides of the raised rings under compression, thus preventing excessive wear in localized areas or directions. Simultaneously, the inclusion of a heat-absorbing alloy ring and its cooperation with the sealing rubber ring efficiently dissipates heat generated by friction within the spherical bearing, mitigating frictional wear between the spherical rigid liner and the upper and lower polytetrafluoroethylene plates to some extent.

The invention discloses a self-adaptive deflection displacement device, and relates to the technical field of industrial equipment supporting structures. The device comprises a supporting top plate, a supporting pipe, an upper pressing plate, a guide pipe, a middle pressing plate, a belleville spring, a spherical bottom plate, an outer cylinder, a polyfluortetraethylene plate, a mounting bottom plate, a fixed frame and a stop block. Self-adaption of horizontal displacement and deflection displacement is achieved through a sliding pair of the spherical bottom plate and the polyfluortetraethylene plate, vertical elastic compensation is provided through the belleville spring, and it is guaranteed that the displacement range is controllable through the guide pipe and the stop block. The device can effectively compensate the deflection deformation of the support steel beam of the SCR denitration reactor under the action of load and temperature, has the characteristics of compact structure, sensitive response and multi-dimensional self-adaption, and is suitable for a support system under complex working conditions.

The invention provides a T-shaped stiffened wallboard ultrasonic detection and comparison device and a preparation method thereof, the structure of the T-shaped stiffened wallboard ultrasonic detection and comparison device is formed by gluing a T-shaped stringer and a skin, and a group of artificial defects are respectively pre-buried at the interface of the T-shaped stringer and the skin, the interface of a T-shaped stringer twisting area and an R area, and different depth positions of a T-shaped stringer stud and the skin; each group of artificial defects comprises at least three groups of polytetrafluoroethylene sheets with different sizes. The preparation method of the reference block mainly comprises the following steps: unfolding the T-shaped stringer and the skin into a plane pattern, cutting a paving layer material sheet according to the unfolded pattern, paving the T-shaped stringer and pre-burying defects, twisting the T-shaped stringer and pre-burying the defects, carrying out bag making and curing on the T-shaped stringer, paving the skin and pre-burying the defects, preassembling the T-shaped stringer and pre-burying the defects, carrying out bag making and curing on the stiffened plate and the like. When the prepared reference block is used for equipment calibration and defect evaluation of an ultrasonic detection method, the defect part and type of a part can be accurately and quickly detected.

The application discloses a method for preparing regularly arranged graphene oxide film through slit-induced self-assembly, and belongs to the technical field of graphene oxide film preparation. The method comprises the following steps: preparing a device for containing graphene oxide solution and forming a slit condition, wherein the device comprises two polytetrafluoroethylene plates and two blocking plates; one of the polytetrafluoroethylene plates is used as a substrate, and the opposite two ends of the polytetrafluoroethylene are blocked by the two blocking plates, so that a region for containing graphene oxide solution is formed in the middle of the substrate; graphene oxide solution is contained in the middle of the substrate, then another polytetrafluoroethylene plate is placed on the top of the blocking plate, a slit condition is formed between the two polytetrafluoroethylene plates, and a regularly arranged graphene oxide film is obtained through drying. The method effectively enables graphene oxide to spontaneously arrange in a regular layer during the drying process, and greatly improves the heat transfer efficiency of the graphene oxide film.