29results about How to "Structural innovation" patented technology

The utility model relates to the technical field of shutters, in particular to a glass clamp and a shutter assembly.The glass clamp comprises a clamp seat body, a binding face attached to a window frame is formed on the clamp seat body, and a drainage groove is formed in the binding face in the length direction; the clamping base body is further provided with an installation structure used for installing louver blades. The shutter assembly comprises a glass clamp and a frame, a drainage groove is formed in the frame in the length direction, and the frame is provided with a rotating structure used for installing the glass clamp. According to the scheme, the structure of the glass clamp is innovated, the drainage groove is additionally formed in the attaching face, so that when the outer side of the blind window is in the rain and strong wind state, rainwater and wind pressure permeate to play a flow guiding role, and the rainwater can flow along the drainage groove of the frame and the drainage groove of the glass clamp; pressure on the inner side of the glass clamp is reduced, so that rainwater entering the glass clamp and permeating into the inner side chamber is reduced, and the waterproof effect is achieved. Therefore, water flow is prevented from flowing into a room through the plane.

The invention belongs to the technical field of catalytic materials, and particularly relates to a macro-micro-nano integrated structured titanium silicalite molecular sieve catalyst as well as a preparation method and application thereof. According to the catalyst, SiC whiskers are grown on the surface of a 3D communicating hole SiC carrier in situ, TS-1 titanium silicalite molecular sieve precursor coating is combined with a steam crystal transformation process, and a TS-1 titanium silicalite molecular sieve coating with framework nickel doping and open mesopores is grown on the surface of the SiC whiskers, so that the loading capacity and catalytic activity of the titanium silicalite molecular sieve are effectively improved; meanwhile, excellent interface bonding force and a continuous heat conduction channel are provided through the SiC whiskers, and the heat transfer performance is enhanced. Compared with a traditional coating, the coating of the catalyst is rougher, and fluid turbulence and mass transfer efficiency are enhanced. According to the structured titanium silicalite molecular sieve catalyst, the utilization efficiency, the reaction rate and the selectivity of the catalyst are remarkably improved through coupling of macroscopic channels, micron pore channels and nano mesopores, and the structured titanium silicalite molecular sieve catalyst is particularly suitable for phenol hydroxylation reaction and olefin oxidation reaction.

This invention discloses a double-helix composite blade long-diameter-maintaining coring drill bit and its manufacturing method, belonging to the field of geological drilling coring equipment. The drill bit includes a drill bit steel body, double-helix composite blades, and a coring inner cylinder. The double-helix composite blades are arranged in a double-helix staggered distribution, including polycrystalline diamond cutting blades and surface-impregnated diamond grinding blades. The polycrystalline diamond cutting blades have a three-dimensional helical forward-inclined structure, embedded with frustum-shaped polycrystalline diamond sheets and triangular polycrystalline diamonds. The surface-impregnated diamond grinding blades have an axial helical structure, equipped with low-temperature surface-impregnated matrix blocks and surface-impregnated large diamond particles. The outer wall surface of the blades is equipped with a helical long-diameter-maintaining structure. The manufacturing method integrates three processes: pressureless impregnation, hot-pressing sintering, and brazing, to prepare the blade matrix base and the surface-impregnated matrix blocks respectively, and then weld them into shape. This invention, through optimized structural design and multi-process synergy, significantly improves the coring efficiency, wear resistance, and structural stability of the drill bit in complex formations, achieving long-term diameter maintenance and high-efficiency drilling.

The present invention belongs to the field of chip data writing, specifically, a turntable device for chip data writing and a method of using the same, wherein the turntable cover is connected to the upper surface of the test seat mounting frame so as to be relatively rotatable, and the lower surface of the test seat mounting frame is connected to a needle plate, which has the freedom of axial linear motion; a plurality of test seats are evenly arranged along the circumference of the test seat mounting frame, and each test seat is located between the turntable cover and the needle plate, and each test seat is installed with a probe for writing data to the chip placed in the test seat, and contacts are arranged on the upper and lower surfaces of the needle plate, and the contacts on the upper surface are evenly distributed along the circumference of the needle plate and correspond to the test seats one by one; the turntable cover is respectively provided with a feed port, a discharge port and a process port, and the turntable cover is stationary in the working state, and the test seat mounting frame rotates relative to the turntable cover in the working state. The turntable device of the present invention has a simple structure, can realize rotational motion, and has its own damping capacity.

This invention discloses a plant protection drone for precision seeding, belonging to the field of agricultural drone technology. It includes a central body and four arc-shaped arms that can move relative to the central body. Each arm is equipped with a power unit and rotors. Driven by a deformation drive mechanism, the arms can switch between a cruising state (forming a circular shape) and an operational state (arching inward to form a three-dimensional structure). In the cruising state, the rotor planes are coplanar, resulting in high aerodynamic efficiency; in the operational state, the rotor planes are raised and moved away from the seeding device, effectively isolating the downwash airflow from interfering with the seeded material, significantly improving seeding accuracy and uniformity. This invention solves the technical problem of seeding drift caused by rotor wind fields in existing plant protection drones.

The invention belongs to the technical field of low-pressure casting, and particularly relates to a low-pressure casting device and method for a large-size aluminum alloy shell metal outer mold composite sand core, the height of a large-size aluminum alloy shell casting is not lower than 600 mm, the inner diameter is not lower than 700 mm, and the average wall thickness is 14-20 mm; the low-pressure casting device comprises a mold system, a sand core system, a pouring system, a chilling block system and a dead head, the pouring system adopts a bottom pouring and stepped pouring mode, the structure of the pouring system is designed according to the height, the transverse characteristic size and the average wall thickness of a casting, the pouring system is deeply optimized, and the casting quality is improved. By adopting the design mode of multiple sprues and circumferentially and uniformly distributed transverse sprues, it is ensured that a feeding channel is solidified later than a casting, the pressure maintaining pressure is continuous and effective, the casting defects of cold shut, air holes, shrinkage cavities, shrinkage porosity and the like are avoided, the mechanical property and air tightness of the large-size casting are remarkably improved, and the cost rate is increased.

The invention discloses a preparation method and application of a nano porous foamed aluminum material, and belongs to the technical field of porous metal materials. The method comprises the following steps: mixing main aluminum powder with SiO2 coated aluminum powder waste; the three-layer core-shell pore-forming agent is of a PMMA inner core / Sn-Bi alloy middle layer / Al2O3 outer layer structure, and the PMMA particle size of the three-layer core-shell pore-forming agent is in gradient distribution (the surface layer is 50-100 nm, the middle layer is 200-300 nm, and the core layer is 400-500 nm); after cold press molding, two-stage stepped sintering is carried out, in the first stage, Sn-Bi alloy is melted at low temperature in N2-H2 atmosphere to wrap aluminum powder, and in the second stage, PMMA is decomposed at high temperature under vacuum, carbon-containing gas and pressure to form pores, and an Al4C3 reinforced phase is generated in situ. High-performance fireproof, catalytic and electromagnetic shielding functional materials can be further prepared through surface compounding of Al4C3 / expanded graphite, in-situ growth of ZnO nanorods / Pt or compounding of carbon nanotubes, and the material can be widely applied to the fields of new energy batteries, environment-friendly catalysis and 5G communication.

This invention discloses a rocket-shaped rotating amusement ride, belonging to the field of amusement equipment technology. The ride includes a column, a lifting and rotating assembly that can move up and down along the column, and multiple rocket cabin assemblies suspended from it. The lifting mechanism includes a fixed pulley at the top of the column and a drive pulley system on the ground. A steel cable passes around the fixed pulley, connecting the lifting and rotating assembly and the drive pulley system, and is balanced by a counterweight. The drive pulley system uses a hydraulic cylinder to change the distance between its internal upper and lower pulley systems to raise and lower the steel cable, achieving efficient and stable lifting. The lifting and rotating assembly can rotate horizontally, and the rocket cabin assemblies can rotate around their own axes. This invention has a novel structure, greatly enhancing the richness and excitement of the amusement experience through multiple composite movements such as lifting, revolution, and rotation.

A hubcap assembly includes a body (10) and a panel trim (20). The panel decorating part (20) and the body (10) are coaxially installed, the panel decorating part (20) is provided with a peripheral wall (21) capable of being arranged on the body (10) in a sleeving mode so that the panel decorating part (20) can be attached to the body (10) and fixedly connected with the body (10), and the panel decorating part (20) partially covers the body (10). The hubcap assembly further comprises a center decorating part (30) and a steel ring (40), wherein the center decorating part (30) and the steel ring (40) are movably connected to the body (10). And the panel decorating part (20) and the body (10) are fixed by adopting connection modes such as hot melting welding, screws and / or clamping. When double-color or multi-color spraying is carried out on the hubcap, the appearance defects that the boundary is not clear, rough, fuzzy, virtual-edge and the like due to poor shielding of the color separation boundary are avoided. And meanwhile, the risk that the hubcap partially or completely falls off due to tire shaking in the vehicle running process is avoided.

The present invention discloses a breaker hammer with a novel vibration reduction principle, comprising a rectangular frame platform, a first mass block and a second mass block, the eccentric mass of the first eccentric block is greater than that of the second eccentric block, the eccentric distances of the first eccentric block and the second eccentric block are the same and the phase angles differ by 180°; the first mass block is placed on the upper surface of the upper platform, the second mass block is located above the upper platform, the second mass block is connected to the corresponding four second eccentric blocks through a second crank, the first mass block is connected to the connecting rods between the first eccentric blocks opposite to each other in the two eccentric groups through two first cranks respectively; a through hole is provided on the second mass block for the first mass block to pass through. The present invention reduces the loss of structures such as air springs and increases the benefits; the dust cover only plays a dustproof role, and no longer needs to absorb the transmitted energy due to the connection with the spring, causing structural damage; the working state depends on whether there is external pressure acting on the breaker hammer head, avoiding empty hitting and energy loss, and reducing noise.

The utility model discloses a mobile phone 4G remote control spherical integrated three-way valve, which belongs to the technical field of valves, and comprises a spherical integrated three-way valve body, a remote control box bottom shell is arranged on the top surface of the spherical integrated three-way valve body, and a solar panel is arranged on the top surface of a remote control box upper cover; according to the utility model, the valve body shell and the water outlet pipeline are integrally formed through injection molding processing, the valve has the advantages of no splicing assembly and no leakage at the splicing part after long-term use, the valve adopts the built-in circular valve plate as a medium cut-off switch unit, the friction surface between the valve and the soft sealant is reduced, the acting torque during opening and closing is effectively reduced, and the service life of the valve is prolonged. The execution gear motor can easily and accurately control opening, closing and flow adjustment of the valve. The caliber of the valve can be commonly used for pipelines such as 75, 90, 110 and 130 which are commonly used in the market. The valve has the advantages of being innovative in structure, accurate in adjustment, not prone to water leakage and corrosion, wide in universal range, long in service life, stable, reliable and low in cost.

The invention belongs to the technical field of sensors, and particularly relates to a self-decoupling sensor and a preparation method and application thereof. The self-decoupling sensor comprises a resistance sensing module and a capacitance sensing module which are stacked. The resistance sensing module comprises a flexible substrate layer, a first conductive nanofiber felt and a flexible substrate layer which are stacked in sequence; wherein the first conductive nanofiber felt is of a resistance sensing structure; the capacitance sensing module comprises a flexible substrate layer, a second conductive nanofiber felt and a flexible substrate layer which are stacked in sequence; wherein the second conductive nanofiber felt is of a capacitance sensing structure; wherein one flexible substrate layer of the resistance sensing module is compounded with one flexible substrate layer of the resistance sensing module. The multi-module sensor is excellent in anti-interference performance and has a self-decoupling function.

The double-conical-surface connecting device comprises a front-end frame and a rear-end frame, a concentric conical column connector of the front-end frame is connected with a conical column connector of the rear-end frame, and a fixing ring and an adjustable fastening ring set which are fixedly connected are connected to the outer portion of the front-end frame in a sleeving mode. And the adjustable fastening ring group is positioned at one end close to the rear-end frame and can smoothly move on the front-end frame. According to the double-conical-surface connecting device suitable for the distributed chassis, connection and separation operation can be completed by controlling the power-on state and the power-off state of the powerful electromagnetic ring base, and complex tools and a large amount of manual operation are not needed; compared with a traditional bolt connection mode, the disassembly and assembly time is greatly shortened, and the working efficiency is improved; under the condition that the distributed chassis needs to be frequently disassembled, replaced, maintained or adjusted, the convenience can save the time period and the cost.

The invention relates to the technical field of cosmetics and preparations thereof, and discloses a heat-resistant liquid crystal emulsion system based on acetylated sodium hyaluronate as well as a preparation method and application thereof, the heat-resistant liquid crystal emulsion system comprises the following components in parts by weight: 1-6 parts of a liquid crystal emulsifier, 0.01-0.2 part of acetylated sodium hyaluronate, 5-60 parts of grease, 0.1-1 part of a thickening agent, 0.1-1 part of a preservative and the balance of water, totaling 100 parts. The preparation method comprises the following steps: respectively preheating the oil phase and the water phase according to the ratio, emulsifying under high-speed homogenization, and stirring and cooling at a controlled temperature. The core of the invention is that acetylated sodium hyaluronate is introduced into a liquid crystal system as a structural stabilizer, and the thermal stability of a liquid crystal structure is remarkably improved through the anchoring effect of the acetylated sodium hyaluronate and a liquid crystal layer; after the emulsion is stored at 40 DEG C for a long time, the liquid crystal texture is kept complete, and the emulsion has excellent long-acting moisturizing performance and can be used as an ideal carrier of high-end cosmetics and external medicine preparations.

The application discloses an integrated double-break and double-end voltage sensing integrated pole-mounted switch shell, and belongs to the technical field of pole-mounted circuit breakers. The shell is provided with a vacuum break chamber and an isolation chamber which are parallel along the vertical direction. A vacuum arc-extinguishing chamber is arranged in the vacuum break chamber, and an isolating switch assembly is arranged in the isolation chamber. An isolation observation window is arranged on the shell at a position corresponding to the isolation chamber. The isolation observation window comprises an upper observation window and a lower observation window which are nested with each other and can slide relative to each other. The opening and closing states of the isolating switch can be judged by observing whether the color-marked isolation worm can be seen through the observation window. Voltage sensors are arranged on the incoming line side and the outgoing line side of the shell, each of which is composed of a high-voltage capacitor and a voltage equalizing net, so that independent collection of double-end voltage signals of the incoming line and the outgoing line is realized. The vacuum break and the sliding isolation break are integrated in one body, the state of the isolation break can be directly and visually judged through the adjustable observation window, and the application has the advantages of compact structure, direct and visual state judgment and the like.

The utility model relates to the technical field of composite beams, and discloses an anti-corrosion durable assembly type profile steel-UHPC outer wrapping roof composite beam which comprises a base, an installation mechanism is fixedly arranged on the top face of the base, and an auxiliary mechanism is fixedly arranged on the side face of the installation mechanism. The mounting mechanism comprises a mounting part and a connecting part; the side surface of the mounting part is fixedly connected with the side surface of the connecting part; the mounting part comprises a lower box-shaped column, and the bottom surface of the lower box-shaped column is in sealing contact with the top surface of the base. By adopting an ultra-high performance concrete material and a special formula, the assembly type profile steel-UHPC externally-wrapped roof combination achieves the effects of high durability and high corrosion resistance, the problem of a complex process of a conventional prestressed concrete beam is solved, the overall cost is saved through the excellent performance of UHPC ultra-high performance concrete, steel bar materials are reduced, the construction process is optimized, the innovative structure is achieved, and the assembly type profile steel-UHPC externally-wrapped roof combination is suitable for large-scale popularization and application. And the profile steel-UHPC externally-wrapped roof composite beam structure can be widely applied to water conservancy building structures.

The invention discloses a cast-in-place floor formwork-free system and a concrete floor construction method.The cast-in-place floor formwork-free system comprises longitudinal beams which are oppositely arranged at intervals, each longitudinal beam is provided with a plurality of connecting plates exposed out of the inner side face of the longitudinal beam, the connecting plates are distributed in the length direction of the longitudinal beams at intervals, and brackets are fixed to the connecting plates; the cross beams are arranged on the brackets of the longitudinal beams on the two sides in a lap joint mode, and the cross beams distributed in the length direction of the longitudinal beams on the two sides at intervals form a formwork supporting system and can serve as a formwork of a cast-in-place floor. In the construction process, only formworks need to be laid on an erected formwork supporting system for concrete pouring, and after concrete is hardened, the cross beams can be dismantled. Therefore, when the formwork-erecting-free system is applied to construction of the floor slab, a traditional formwork supporting system is omitted, occupation of on-site space can be reduced, and sufficient supporting force and construction safety are guaranteed; the construction process is simplified, the time for building and dismantling the formwork is shortened, the labor cost is saved, and the construction efficiency is improved.

This application provides a high specific surface area and highly active metal hydroxide, its preparation method, and its application, belonging to the field of new energy material preparation technology. The method includes: dissolving a binary or ternary metal source in deionized water at room temperature and magnetically stirring to form a clear metal salt solution; sequentially adding ammonium fluoride, hexamethylenetetramine, and a surfactant selectively added for the binary or ternary metal source, mixing thoroughly to obtain a precursor solution; heating the precursor solution using a two-stage heating mode of low-temperature induced nucleation and medium-temperature directional growth; after the reaction system naturally cools to room temperature, collecting the precipitate, washing and drying it to obtain the target metal hydroxide; and obtaining target metal hydroxides with different structures by controlling the molar ratio of metal ions within the binary or ternary metal source. This method offers a simple and controllable preparation process, is adaptable to binary-ternary systems, and is green and economical.

The invention provides a plate-shaped piezoelectric linear motor based on an in-plane first-order bending longitudinal mode, and belongs to piezoelectric motors. The motor is composed of a plate-shaped stator and a linear guide rail, the plate-shaped stator comprises a single driving foot made of wear-resistant materials and a vibrator body made of piezoelectric ceramics, and the linear guide rail is pressed on the single driving foot through pre-pressure. The oscillator body is provided with three (or'two ') polarization subareas, wherein the left polarization subarea and the right polarization subarea (or the left polarization subarea) form an A phase, and the middle polarization subarea (or the right polarization subarea) forms a B phase. Two orthogonal working modes of the stator are respectively an in-plane first-order bending vibration mode and a first-order symmetrical longitudinal vibration mode, two paths of sinusoidal signals with the phase difference of pi / 2 are applied to the A phase and the B phase of the stator, and the two orthogonal working modes of the stator are excited at the same time, so that mass points on the contact surface of the single driving foot generate elliptic motion, and a guide rail is driven through the friction effect. Compared with an existing piezoelectric motor, the motor adopts a low-order working mode, and the operation speed and the operation stability of the motor are higher.

The invention discloses a bag-type dust collector for assisting fine powder sedimentation and collection through series connection of exhaust air and a bin body, and belongs to the technical field of environmental protection equipment. The device comprises a bin body, a cloth bag, an induced draft fan and an exhaust pipe. An exhaust pipe of the induced draft fan is divided into a plurality of flow dividing manifolds transversely penetrating through the interior of the bin body, and each flow dividing manifold is provided with a flapping device driven by air pressure in the pipe. A flow switching mechanism is arranged at the outlet end of each flow dividing manifold, and the flow switching mechanisms periodically and alternately block and communicate the different flow dividing manifolds. When a certain flow dividing manifold is suddenly blocked, static pressure which rises instantaneously in the pipe drives the flapping device to act, and the adjacent cloth bags are mechanically flapped. According to the invention, heat energy and pressure energy of exhaust gas of the system are utilized, pre-drying and self-driving of the cloth bag are realized, mechanical auxiliary ash removal without additional energy consumption is realized, the ash removal efficiency is high, and the energy-saving effect is remarkable.

The present invention discloses a three-in-one parts inspection tool, including a base plate, a U-shaped vertical plate installed at the top center of the base plate, a U-shaped inspection shaft installed on the top of the U-shaped vertical plate, an angled vertical plate installed on one side of the top of the base plate, a positioning pin is provided at the bottom of the angled vertical plate, an angled inspection plate is provided on the top of the angled vertical plate, an axle seat vertical plate is installed on the other side of the top of the base plate, and an axle seat positioning shaft and a cushion block group are installed at the bottom of the axle seat vertical plate. This three-in-one parts inspection tool integrates some parts inspection tools of the same specification and the same series, that is, a set of inspection tools can be used to inspect multiple parts, which saves costs and improves inspection efficiency. Compared with the original inspection method, it is easy to operate and has improved inspection efficiency. Compared with the original inspection method, the inspection tool is also simpler in structure, simple and reasonable in structure, easy to use, and has the advantages of structural innovation, efficiency improvement, cost saving, beautiful appearance, etc. It effectively solves the existing problems and has high practical value.

This utility model relates to the field of high-precision transmission technology, specifically disclosing a pin-fixed cage and a planetary roller screw assembly. The cage includes an annular cage base with a central hole and multiple roller limiting holes evenly distributed along its circumference. The cage base also has at least two pin holes distributed along its circumference. It further includes a pin that is adapted to and installed within the pin holes. When the pin is installed in the pin holes, a portion of it extends inward into the central hole. This structure achieves axial positioning through the pin, breaking away from the traditional two-sided positioning design. While ensuring circumferential rotational freedom, it simplifies the overall structure. Even under the harsh conditions of miniaturized planetary roller screw assemblies, the pin structure still ensures the reliable connection between the cage and the screw or nut, maintaining excellent operational stability.

The invention discloses multi-scale synergistically enhanced phenyl silicone rubber and a preparation method thereof, and belongs to the technical field of phenyl silicone rubber, the multi-scale synergistically enhanced phenyl silicone rubber comprises the following components by weight: 70-90 parts of a gradient phenyl silicone rubber matrix, which is compounded by single phenyl silicone rubber and diphenyl silicone rubber according to a mass ratio of (1.5-2.5): 1; the core-shell structure dynamic crosslinking particles take SiO2 as a core and phenylsiloxane as a shell, and are modified by a KH550 silane coupling agent, and the mass ratio of the core to the shell is 1: (0.8-1.2); 5-8 parts of a graphene / fluorinated silicone rubber interpenetrating network, wherein the graphene / fluorinated silicone rubber interpenetrating network comprises 0.5-1.0 part of isocyanate functionalized graphene; 12 to 18 parts of fumed silica; 3-5 parts of a dynamic crosslinking auxiliary agent which is phenyl silicone oil containing ureido; 1.0 to 1.5 parts of vulcanizing agent; the diameter of the short carbon fiber is 5-10 [mu] m, and the length of the short carbon fiber is 50-100 [mu] m.

The present application relates to the field of graphene reinforced titanium alloy composite material, in particular to a preparation method of in-situ deposition three-dimensional network graphene reinforced titanium alloy composite material, which comprises the following steps: firstly, three-dimensional network graphene is in-situ deposited on the surface of porous titanium through chemical vapor deposition process; then, titanium alloy melt is filled into the porous preform by using high vacuum melt infiltration process, after a period of heat preservation treatment, finally, three-dimensional network graphene reinforced titanium alloy composite material is obtained by quenching. The three-dimensional network graphene reinforced titanium alloy composite material prepared by the present application has good interface combination and dense structure, by introducing graphene in the composite material, not only the load transmission effect is achieved, but also the part of TiC particles formed at the interface can make the crack deflect and hinder the crack propagation.

The application discloses a communication encryption method based on an adversarial neural cipher model, aiming at solving the problem of insufficient randomness of ciphertext and limited security of the ANC model caused by structural homogenization. In the three-party game framework of the sender, the receiver and the attacker, a pre-trained randomness detector is introduced. In the ANC model training, the initial basic encryption and decryption and attack resistance training are carried out; in the later training period, the randomness of the ciphertext generated by the sender is periodically evaluated by using the detector, and the evaluation result is used as part of the loss function to guide the sender to generate ciphertext with strong confidentiality and high randomness. Finally, the trained sender and receiver neural networks are used as encryption and decryption modules and applied to actual communication. Through structural innovation and diversified training targets, the application effectively enhances the randomness of the generated cipher algorithm and improves the communication security.

The invention discloses a door and window structure capable of being temporarily reinforced and an assembly of the door and window structure. The door and window structure comprises a metal frame and glass, and is characterized in that mechanical connection interfaces are preset in at least two positions of the indoor side of the metal frame and are used for detachably installing a temporary reinforcing cross beam from the indoor side. Preferably, the interfaces are symmetrically arranged on the left and right metal vertical stiles, and are provided with decorative caps to keep daily beauty. The matched reinforcing assembly comprises a cross beam, a connecting piece and a selectable buffering cushion. According to the invention, the standardized interface is preset on the door and window body, so that the temporary reinforcement operation becomes simple, convenient and rapid, the decoration is not damaged, the overall wind pressure resistance of the door and window can be effectively improved, and both daily beauty and emergency safety are considered.

The invention relates to a hydraulic cylinder support ring, comprising an inner ring and an outer ring which are coaxially sleeved; the inner ring is a first powder sintered body; the first powder sintered body is formed by hot pressing and sintering a first powder composition, the first powder composition comprising: 100 parts of iron powder, 20-23 parts of electrolytic copper powder, 0.5-1 parts of graphite powder, 2-3 parts of tungsten carbide powder, 3-4 parts of transition metal disulfide powder, and 2-3 parts of zinc stearate; the outer ring is a second powder sintered body; the first powder sintered body is formed by hot pressing and sintering the first powder composition, the second powder composition comprising: 100 parts of polytetrafluoroethylene powder, 1-1.5 parts of carbon fiber powder, 1-2 parts of transition metal disulfide, and 10-15 parts of bronze powder.

The invention discloses flame-retardant gel based on hydroxyethyl cellulose and sodium alginate as well as a preparation method and application of the flame-retardant gel, and belongs to the technical field of fire prevention and extinguishing materials for coal mines. The preparation method of the flame-retardant gel comprises the following steps: adding hydroxyethyl cellulose, acrylic acid, acrylamide and an initiator into an alkaline solution at 0-5 DEG C, and carrying out a polymerization reaction to obtain hydroxyethyl cellulose network gel; adding a solution containing Al < 3 + > into the sodium alginate solution, and cross-linking to obtain sodium alginate network gel; the preparation method comprises the following steps: mixing hydroxyethyl cellulose network gel, sodium alginate network gel and sodium bentonite, carrying out heat preservation at 48-52 DEG C to form the mixture, and soaking the formed mixture in a solution containing Al < 3 + > to obtain the flame-retardant gel based on hydroxyethyl cellulose and sodium alginate. By constructing a hydroxyethyl cellulose-sodium alginate double-network structure and combining the synergistic effect of the sodium bentonite, the synergistic improvement of the plugging performance, the water retention performance and the flame retardant performance of the composite gel is realized.