32 results about "Coaxial nozzle" patented technology

The invention relates to a laser processing system and method with atmosphere auxiliary protection, and the processing system comprises a laser head which is used for generating and transmitting a laser beam to the downstream, and the side part of the laser head is provided with a gas inlet interface for introducing protective gas; the upstream end of the atmosphere protection cover is connected with the lower part of the laser head, the atmosphere protection cover comprises a cover body and an axial adjustable gas cover capable of axially displacing relative to the cover body, and an adjustable gas-light coaxial nozzle is arranged at the tail end of the axial adjustable gas cover; the atmosphere protection cabin is arranged below the atmosphere protection cover and comprises a working table, an observation window and a flexible sealing telescopic cover, the observation window, the working table and the flexible sealing telescopic cover jointly form a closed laser processing cavity, the working table is located at the bottom of the laser processing cavity, and the flexible sealing telescopic cover is located at the bottom of the working table. A first end of the flexible sealing telescopic cover is connected with the bottom of a cover body of the atmosphere protection cover in a sealing manner, and a second end of the flexible sealing telescopic cover is connected with the top of the observation window in a sealing manner, so that a dynamically-sealed channel which is telescopic along with the movement of the laser head is formed between the atmosphere protection cover and the atmosphere protection cabin; the gas supply unit is used for independently supplying protective gas to the gas inlet interface of the laser head and the gas inlet control valve of the atmosphere protection cabin; and the laser smoke dust purification unit is connected to a gas outlet control valve of the atmosphere protection cabin and is used for pumping, discharging and purifying gas in the atmosphere protection cabin and smoke dust generated in the machining process.

The invention discloses a gradient thermal response composite nanofiber diaphragm and a preparation method thereof. The composite nanofiber diaphragm is composed of three functional layers: a) a surface layer: a low-density polyimide nanofiber layer (porosity is 60%-80%), and doped nano zirconium dioxide (5-10 wt%) improves the wettability of an electrolyte; b) a middle layer: polyimide / boron nitride nanosheet composite fibers (the content of boron nitride is 15-20wt%) form a three-dimensional heat conduction network; c) a bottom layer: a thermally induced phase change layer (polyimide and phase change microcapsule co-spinning) which triggers a hole closing effect at 160 DEG C; an in-situ electrostatic spinning composite process: adopting a coaxial nozzle for synchronous spinning; injecting a polyimide spinning solution containing boron nitride into an inner layer, and injecting a phase change microcapsule suspension into an outer layer; and an electric field gradient control technology (the voltage is gradually reduced from 25kV to 18kV) is introduced, so that the gradient distribution of the fiber diameter from 80nm to 200nm is realized. Through the innovative structural design and the advanced preparation process, the safety, the performance and the reliability of the lithium ion battery under the high-temperature working condition are remarkably improved, and important technical support is provided for the development of the high-performance lithium ion battery. The 180 DEG C thermal shrinkage rate of the product is less than 2% (reduced by more than 40% compared with the prior art); and the bottom layer closed hole response time during thermal runaway is less than 8 seconds (the traditional diaphragm is more than 15 seconds).

Embodiments of the present disclosure provide for coaxial nozzles, capsule fabrication systems comprising coaxial nozzles, and methods of capsule fabrication using capsule fabrication systems. In certain embodiments, coaxial nozzle configurations, capsule fabrication systems, and methods as described herein can be used for multi-layered capsule fabrication.

The present invention belongs to the field of engine combustion chambers and combustion heater devices, and discloses a jet injection design method and nozzle with coaxial bubbles and a pintle. The jet injection design method with coaxial bubbles and a pintle includes determining the technical solution; determining the technical functions of each module; determining the flow rate requirements of each module; and determining the processing method of the coaxial nozzle for bubbles and a pintle. The coaxial nozzle for bubbles and a pintle includes a bubble nozzle and a pintle nozzle with the same central axis. The pintle nozzle is sleeved outside the bubble nozzle, and the outlet of the bubble nozzle is located in the inner cavity of the pintle nozzle. The jet injection design method with coaxial bubbles and a pintle of the present invention adopts a compact layout and partitioned four-cavity design. The obtained coaxial nozzle for bubbles and a pintle has a simple and reliable structure, is light in weight, and has engineering practical value.

The application provides a battery liquid injection hole sealing laser welding device, which comprises a mounting seat, a laser processing assembly, a wire feeding assembly, a coaxial nozzle assembly and a welding protection air outlet device; the laser processing assembly and the wire feeding assembly are respectively installed at two ends of the mounting seat, the coaxial nozzle assembly is installed at a laser output end of the laser processing assembly, the wire feeding assembly is communicated with the coaxial nozzle assembly, the welding protection air outlet device is installed on the laser processing assembly, and an air outlet of the welding protection air outlet device is arranged close to a welding port of the coaxial nozzle assembly. The battery liquid injection hole sealing laser welding device provided by the application solves the problems of virtual welding, pinhole, crack and weld burst point which are caused by laser direct lithium battery liquid injection welding sealing through the process of melting a welding wire by laser radiation.

The invention relates to the technical field of micro-nano fiber material preparation, and discloses a high-elastic crimped micro-nano fiber sponge and a preparation method thereof.The preparation method comprises the steps that an asymmetric airflow shearing field is constructed by adjusting an eccentric coaxial spray head, spinning solution jet flow is induced to generate high-frequency spiral whipping, and micro crimped fibers are formed; meanwhile, pulse hot airflow generated by an air cushion receiving table is used for carrying out suspension lifting, in-situ heat setting and vertical disturbance on deposited fibers, and an isotropic three-dimensional porous network with a Z-axis physical interlocking structure is constructed. The volume density of the prepared sponge is only 3-30 kg / m < 3 >, the porosity is as high as 90%-99%, the rebound rate is kept at 95% or above after 1000 times of cyclic compression under 60% strain, the problems that a compact film is easily formed, the interlayer binding force is weak and the fatigue resistance is poor in a traditional spinning technology are effectively solved, and the sponge has the advantages of being simple in process equipment, wide in raw material adaptability and the like.

The utility model provides a jet mill combined type nozzle. The jet mill combined type nozzle comprises a sleeve, a spray head and a pipe joint. The front end of an inner hole of the sleeve is of a conical hole structure, and the rear end of the inner hole is a threaded hole. The nozzle comprises a nozzle part and a main body part which are coaxial, the nozzle part and the main body part are both of a cylindrical structure, the outer diameter of the nozzle part is smaller than that of the main body part, the junction of the nozzle part and the main body part is an outer conical surface, and a channel is formed in the nozzle in the axis direction; the nozzle is slidably arranged in the sleeve, the nozzle portion penetrates through the front end of the sleeve, and the outer conical surface is matched with the conical hole structure of the sleeve. External threads are arranged at the front end of the pipe joint and used for being connected with the threaded hole of the sleeve, when the pipe joint is connected with the sleeve, the front end of the pipe joint is pressed on the end face of the main body part, and a sealing ring is arranged on the inner wall of the rear end of the pipe joint. According to the scheme, the service life of the spray head can be effectively prolonged, and the spray head is lower in manufacturing price and more convenient to replace.

The present application relates to the technical field of gas atomization device, and discloses a tight coupling nozzle structure and a gas atomization device, the tight coupling nozzle structure comprises a gas atomization nozzle disc and a flow guide pipe, the gas atomization nozzle disc is composed of a coaxial nozzle disc upper cover and a nozzle disc base, the flow guide pipe is inserted into the center hole of the thickness of the nozzle disc upper cover and forms a tight coupling assembly structure with the gas atomization nozzle disc, the vertical spacing between the nozzle disc gas outlet and the outer wall of the flow guide pipe is equal to the bottom ring thickness of the nozzle disc upper cover, the bottom ring thickness of the nozzle disc upper cover is 1-2 mm, the inner core of the flow guide pipe is a cylindrical hole, the outside is an integrally formed cylindrical section and a contraction section, and the contraction angle of the flow guide pipe contraction section is 30-60 degrees, the present application optimizes the contraction angle of the flow guide pipe contraction section and the bottom ring thickness of the nozzle disc upper cover, reasonably controls the position of the atomization backflow area, obtains higher fine powder yield, and reduces the probability of nozzle blockage.

The invention discloses a capillary tube vertical penetrating tank microfluid control spinning head, a spinning device nanofiber and a preparation method. The spinning head comprises a capillary tube gathering inlet pipe, a series of stainless steel capillary tubes and a storage tank. The capillary tube gathering inlet pipe is positioned above the tank body, and one end of the capillary tube gathering inlet pipe is connected with one end of each series of stainless steel capillary tubes; the other ends of all the series stainless steel capillary tubes are unfolded by taking the capillary tube gathering inlet tube as the center, the series stainless steel capillary tubes vertically penetrate through the tank body from the upper part of the tank body and penetrate out of the bottom of the tank body, and coaxial small holes are formed in the positions, penetrating out of the tank body, of the series stainless steel capillary tubes; the small holes and the series stainless steel capillary outlets form series coaxial outlets, and another inlet for injecting sheath fluid into the tank body and a tank body cleaning outlet are formed in the side face of the tank body. The spinning head is provided with a plurality of coaxial nozzle outlets, and a plurality of strands of coaxial spinning microfluid are stretched into the core-sheath structure nanofibers through the interaction of a high-voltage electrostatic field and fluid.

A burner comprises a primary nozzle for injecting an oxygen-rich gas. The primary nozzle is designed as a supersonic nozzle. A coaxial nozzle having an annular outlet opening is provided for injecting a fuel gas. The coaxial nozzle is designed as a subsonic nozzle and is coaxial to the primary nozzle. The primary nozzle has a convergent portion and a divergent portion, which adjoin each other at a radius of the narrowest cross-section. The annular outlet opening is located at an end face of the burner. The fuel gas, in the form of hydrogen or a mixture of hydrogen and a hydrocarbon-containing gas, is injected at a fixed inlet pressure and a fixed inlet volumetric flow rate, with respect to a planned thermal power of the burner. In contrast, the inlet pressure and the inlet volumetric flow rate of the oxygen-rich gas are varied according to the application.

The invention relates to the technical field of laser cutting machine tools, and discloses a stainless steel machine tool for workpiece polishing and cutting, which comprises a mounting sliding block driven by a three-dimensional moving platform, a laser is mounted on the mounting sliding block, and the laser is provided with a coaxial nozzle; a protective film is arranged on the workpiece surface; the controllable windowing unit is used for forming a long and narrow window strip on the protective film along the neighborhood of a preset cutting track and reserving the edges of the protective film on the two sides; and the suction cover is arranged around the laser, and the bottom of the suction cover is provided with a skirt edge and is communicated with an external pumping unit. Through the integrated design of a long and narrow window and a quasi-closed channel, the edges of protective films on the two sides serve as natural side walls to form the quasi-closed channel with an annular skirt edge and the surface of a workpiece, and the front electromagnetic valve and the rear electromagnetic valve are matched for gating suction, so that cutting smoke dust and particles are bound above a window belt and directionally sucked into a suction cover in an entrainment mode; and the surface state that the surface is clean after being cut is achieved.

This invention discloses a laminar plasma in-situ atomization powder production device and method. The device includes a coaxially integrated laminar radio frequency plasma torch and a supersonic laminar gas atomizing nozzle. A metal wire is vertically fed into the core of the radio frequency plasma torch along its axial center. The end of the wire melts instantaneously without crucible constraint. The resulting melt is then sheared and broken by the supersonic laminar inert gas surrounding the outer ring of the plasma torch outlet, achieving in-situ powder production with simultaneous melting and atomization. This invention integrates plasma heating and melting with supersonic gas atomization within the same coaxial nozzle, eliminating the risk of crucible material contamination, avoiding component segregation problems during the smelting of refractory metals and refractory high-entropy alloys, significantly improving the yield of fine powder, and effectively suppressing the formation of satellite powder. It is suitable for the efficient and high-purity preparation of spherical powders of high-melting-point metals such as tungsten, molybdenum, tantalum, niobium, and rhenium, as well as their multi-component high-entropy alloys.

The present application relates to laser cutting machine tool technical field, disclose a stainless steel machine tool for workpiece polishing cutting, containing through three-dimensional moving platform drive installation sliding block, the installation sliding block is installed with laser, and the laser has coaxial nozzle;Workpiece surface is equipped with protective film;Controllable windowing unit is used for forming a long narrow window band on the protective film along the neighborhood of the predetermined cutting track and retaining the protective film edge on both sides;And, the suction hood is arranged around the laser, the bottom is equipped with apron and communicates with the external exhaust unit.The present application is through "long narrow windowing- quasi-closed channel" integrated design, the two sides protective film edge is used as natural side wall, with annular apron and workpiece surface form quasi-closed channel, and cooperate with the two-stage electromagnetic valve gating suction, make cutting fume and particle be bound above the window band and directional suction to the suction hood, realize "cutting clean" surface state.

The invention discloses a water cup bottom hole pipe and microfluid control combined spinning head, a spinning device, nanofibers and a method. The water cup bottom hole pipe and microfluid control combined spinning head comprises a capillary tube gathering inlet pipe, a series of stainless steel capillary tubes and a water cup. The capillary tube gathering inlet pipe is positioned above the water cup, and one end of the capillary tube gathering inlet pipe is connected with one end of each series of stainless steel capillary tubes; the other ends of all the series stainless steel capillary tubes are unfolded with the capillary tube gathering inlet tube as the center, the series stainless steel capillary tubes start to be unfolded to the bottom of the water cup from the interior of the water cup and evenly penetrate out around the cup bottom, and coaxial small holes are formed in the positions, penetrating out of the water cup, of the series stainless steel capillary tubes at the bottom of the water cup. And the small holes and the series stainless steel capillary outlets form series coaxial outlets. According to the spinning head, a plurality of coaxial nozzle outlets are used as macroscopic templates, and a plurality of strands of coaxial spinning microfluid are stretched into nanofibers with clear core-sheath structures through the interaction of a high-voltage electrostatic field and fluid.

The invention discloses a method for preparing a porous silk fibroin bone cement scaffold by using a low-temperature 3D printing technology, and belongs to the technical field of biomedical materials. The method comprises the following steps: co-extruding shell layer ink containing silk fibroin, alginate and bioactive ceramic and sacrificial core layer ink to a low-temperature platform of which the temperature is distributed in a gradient manner by adopting a coaxial nozzle; the formed frozen core-shell structure tows are subjected to freeze drying and then immersed in a calcium ion solution, so that elution and removal of a sacrificial core layer are synchronously achieved to construct mesopores, and ionic crosslinking of alginate is achieved to enhance the structure; and finally, finishing final curing through mild ethanol steam treatment. According to the invention, a three-stage bionic pore channel structure with macropores, mesopores and gradient micropores can be constructed, and the prepared scaffold has excellent structural controllability and mechanical properties.

The invention discloses an additive manufacturing experimental device based on an alternating magnetic field and variable metal droplet sizes. The device is sequentially provided with a laser generator, a protective gas mechanism, a powder / wire feeding mechanism, a coaxial nozzle, molten metal droplets, a workpiece (a molten pool) and a platform for bearing the molten pool which are coaxially arranged. An alternating magnetic field coil and an alternating magnetic field displacement table moving up and down are arranged at the position flush with the surface of the molten pool, and the alternating magnetic field can generate eddy current in the molten pool so as to increase viscous dissipation of flowing in the molten pool, reduce oscillation kinetic energy, avoid formation of unnatural recesses on the surface of the molten pool and reduce splashing; according to the powder / wire feeding mechanism, powder / wires with different diameters are adopted for alternately feeding powder, the mirror symmetry of the same liquid drop size and speed is broken, and convection in a molten pool is enhanced. The magnetic field provides conditions for stable printing under strong airflow, the variable-size liquid drops optimize the microstructure on the basis of stability, and the DED technology is jointly promoted to develop to better performance.

The utility model discloses a coaxial nozzle for laser welding, which comprises a nozzle seat, a flow guide body and a spray head. The upper end of the nozzle seat is provided with a connecting piece. The flow guide body is provided with a flow guide core in the center, and the center is provided with a laser guide core and coaxial with the taper mouth of the spray head. A fixed partition ring is arranged on the inner side of the flow guide body. A shunt hole is formed on the partition ring, and a shunt plate and an annular collecting groove are arranged to form a converging channel gradually narrowing from top to bottom. A cyclone plate is arranged along the outer periphery of the flow guide core on the inner side of the partition ring. The main airflow flows downward through the spiral flow channel, mixes with the converging branch airflow upstream of the taper mouth and is coaxially sprayed out. The structure realizes isobaric distribution and low-turbulence rectification, forms a near-axis symmetrical high-speed beam, suppresses plasma shielding and splashing back, stabilizes the melting depth and forming, provides effective blowing for the protective lens, and improves the welding quality and service life.

This application belongs to the field of combustion chamber design, and specifically relates to a micro-sized fuel-air jet mixing nozzle, including an air pipe, a fuel nozzle, and a combustion chamber flame tube; the air pipe and fuel nozzle are coaxially arranged, the air pipe is connected to the combustion chamber flame tube, the fuel nozzle is inserted into the air pipe, the fuel nozzle has a cylindrical structure, the outlet end of the fuel nozzle has a coaxial nozzle hole, and the side wall has an inclined nozzle hole, the outlet of the inclined nozzle hole facing the combustion chamber flame tube. The swirler is eliminated, thus eliminating the large-scale low-speed backflow zone; the use of an 8–15 mm micro-sized air pipe significantly improves the wall heat dissipation capacity, reducing the boundary layer temperature and the probability of spontaneous combustion; the inclined jet is injected along the mainstream direction, avoiding reverse flow, suppressing high-hydrogen fuel backfire at the source, and significantly improving the operational safety of the combustion chamber; the coaxial jet and the inclined jet work together to achieve rapid and uniform premixing of fuel and air over a short distance, avoiding localized rich-fuel high-temperature zones.

The invention belongs to the technical field of semiconductor wafer manufacturing, and particularly relates to a standby energy-saving structure system and an energy-saving method thereof. The invention provides a standby energy-saving structure system which comprises a reaction cavity, a base, a heater, a control system, a gas inlet and a multi-layer coaxial nozzle, and the multi-layer coaxial nozzle comprises a first gas channel used for conveying a metal organic source, an isolation channel, a second gas channel used for conveying a hydride source, a heating resistance wire and a phase change heat storage layer. According to the structure system, the splitting decomposition efficiency of NH3 can be improved by utilizing heat energy in a standby stage, and the splitting decomposition efficiency is quickly released when production is recovered, so that the energy consumption is reduced, the preheating time is shortened, the production efficiency is improved, a heat flow path is naturally switched only by putting in / moving out a wafer, and the structure is simplified and reliable.

The application belongs to the technical field of tobacco, and relates to a microcapsule embedding water-soluble essence as well as a preparation method and application thereof. The wall material of the microcapsule is a temperature-sensitive material, and the microcapsule is coated with a water solution containing water-soluble essence. The temperature-sensitive material is heated to 70-80 DEG C to completely melt, and a molten wall material glue liquid is obtained. The water-soluble essence is dissolved in water to obtain an essence water solution. The molten wall material glue liquid is delivered to the middle layer of a three-fluid coaxial nozzle, the essence water solution is delivered to the inner layer of the three-fluid coaxial nozzle, and the first cold wind of-5-0 DEG C is delivered to the outer layer of the three-fluid coaxial nozzle. The molten wall material glue liquid, the essence water solution and the first cold wind are simultaneously sprayed out by the three-fluid coaxial nozzle, so that the molten wall material glue liquid coats the essence water solution, and the microcapsule is obtained. The microcapsule provided by the application has the effect of slow-release essence, and the preparation method has simple steps and can avoid environmental pollution caused by plastic.

The invention discloses a coaxial additive machining device for laser additive and subtractive equipment, which comprises a cutter handle, a collimation module, a light splitting and focusing module, a reflection module, a protective glass module, an adjusting module, a coaxial nozzle and a monitoring module, and is characterized in that the collimation module is used for collimating laser beams into parallel beams, the light splitting and focusing module is used for focusing the collimated parallel beams, and the reflection module is used for reflecting the collimated parallel beams; the reflecting module changes the path of the focused light beam, the adjusting module can adjust the defocusing amount of laser processing, the coaxial nozzle enables the laser beam and the printing powder to be mutually converged and form a processing molten pool, and the reflecting module can reflect light generated by the molten pool to the monitoring module. The invention further discloses a coaxial additive machining method for the laser additive and subtractive equipment. By means of the mode, the main shaft of the machine tool machining center can be connected with material adding equipment or material reducing equipment, product size miniaturization is facilitated, meanwhile, the monitoring module is arranged, a molten pool can be monitored, and the machining condition in the machine tool machining center can be known conveniently.

The invention relates to the technical field of coal-fired power plant water treatment and environmental protection, and discloses a flue spray drying combined desulfurization wastewater recycling zero-discharge treatment method which comprises the following steps: performing pressurized dissolved gas and heating modulation on desulfurization wastewater to construct an overheated dissolved gas multiphase working medium; coaxial nozzles are used for cooperating with high-temperature sheath gas to jet towards a main flue, and low-density hollow salt particles are formed through flash evaporation phase change and a bubble expansion mechanism; the coal-fired fly ash penetrates through a jet beam by utilizing an inertia difference based on Stokes quasi numbers, and low-density hollow salt particles are guided to deflect along with airflow to enter a salt-rich branch; and after gas film protection of the virtual impactor is introduced, fine fly ash is further separated and waste salt is recycled by pneumatic cyclone classification. The density of the waste salt is changed through hollow granulation, online separation of the waste salt and the fly ash is achieved in combination with a flow field inertia screening mechanism, the problems of nozzle blockage and scaling are solved through sheath gas and a gas film structure, and zero-emission recycling treatment of the high-salt wastewater is achieved.

The invention relates to the technical field of semiconductor manufacturing equipment, in particular to an integrated closed-loop control laser-induced tin drop discharge plasma plume restraining device which comprises a plasma plume space restraining module, a tin drop centrifugal continuous supply module and a liquid drop splashing in-situ detection module. An annular airflow barrier is formed by the coaxial nozzle array and the inert gas buffer layer, so that the optimal plume constraint effect is achieved; the mode that a high-speed rotating disc and a ceramic blocking screen are combined is adopted, and high-frequency and stable spraying of liquid tin drops is achieved; the size and track offset of the liquid drop are analyzed through an image recognition algorithm, parameters are dynamically fed back and adjusted, and closed-loop control is achieved. The device is used in a light source system of the extreme ultraviolet lithography machine, and solves the key technical problems of unstable supply of the tin drop target material, uncontrollable plasma plume diffusion, serious pollution of an optical assembly and the like under the high-frequency working condition.

The invention relates to the technical field of shape memory fiber manufacturing, in particular to a shape memory fiber material based on coaxial near-field direct writing and a preparation method thereof. A preparation method of a shape memory fiber material based on coaxial near-field direct writing comprises the following steps that S1, coaxial hollow fibers are prepared, specifically, the coaxial hollow fibers are prepared through near-field direct writing by using a coaxial nozzle, the coaxial hollow fibers comprise fiber bodies, and hollow flow channels are formed in the fiber bodies in the extending direction of the fiber bodies; s2, preparing a fluid microcavity: preparing a fluid storage part, wherein the fluid storage part is internally provided with the fluid microcavity; the prepared shape memory fiber material has the advantages of continuous adjustability, shape memory controllability and high reliability, and is not limited by external field excitation conditions; the technical problems that deformation triggering of an existing shape memory material is easily restricted by external field excitation conditions, and the requirement of a precise device for continuous adjustable deformation is difficult to meet are solved.

This invention discloses a self-centering and self-mixing semi-flexible coaxial nozzle capabilities, and its manufacturing method. The invention comprises an upper cover, a semi-flexible inner needle, a three-way casing, a three-way convex platform and an outer needle, wherein the bottom of the upper cover is screwed on the three-way casing; the central part of the three-way casing is provided with the semi-flexible inner needle and the outer needle is screwed on the bottom of the three-way casing; the semi-flexible inner needle extends to the inside of the outer needle through the head of the three-way casing; and two three-way convex platform are screwed on the left and right side surfaces of the three-way casing. The invention has the following beneficial effects: the semi-flexible inner needle self-centers via fluid dynamics to correct coaxiality errors; the three-way mixer enables passive material blending; and a sealed assembly (fixed plate, fixture block) ensures leak-proof rigidity.

The application discloses a method for preparing a porous silk fibroin bone cement scaffold by using a low-temperature 3D printing technology, and belongs to the technical field of biomedical materials. The method comprises the following steps: adopting a coaxial nozzle to extrude shell ink containing silk fibroin, alginate and bioactive ceramics and a sacrificial core ink to a low-temperature platform with a gradient distribution of temperature; after the formed frozen core-shell structure silk bundle is subjected to freeze drying, the silk bundle is immersed into a calcium ion solution, so that the elution and removal of the sacrificial core are realized synchronously to construct mesopores, and the ion crosslinking of the alginate is realized to enhance the structure; and finally, the final solidification is completed through mild ethanol vapor treatment. The application can construct a three-level biomimetic pore structure with macropores, mesopores and gradient micropores, and the prepared scaffold has excellent structure controllability and mechanical properties.

This invention provides a multi-material directional energy deposition additive manufacturing method and system. The method includes: a host computer slicing a 3D digital model with boundary representation and material property information to obtain the coordinate information of the model boundary surface and model voxels in 3D space, as well as the corresponding material property information; the host computer identifies the material property information, determines whether the required raw material is a single material or a combination of multiple materials, and selects the powder feeding mode of a multi-channel intelligent powder feeder; the identified material powder is added to the multi-channel intelligent powder feeder; the host computer converts the material property information and coordinate information into dynamic material commands that drive the multi-channel intelligent powder feeder and heat source to supply and melt different material powders, and multi-axis motion path information that drives the laser powder coaxial nozzle and positioner to coordinate the motion to complete the real-time dynamic deposition of materials with different properties in 3D space. This method breaks through the limitations of traditional formats and significantly improves material switching and component control capabilities.

The invention discloses a copper-aluminum dissimilar metal multi-process coupling laser welding strengthening method which is characterized in that in-situ coordination of welding, stress inversion, targeted strengthening and closed-loop repair is realized by integrating a three-layer coaxial nozzle end effector, a composite laser source and a digital twin system; synchronously stabilizing the temperature of the welding pool at 2200-2500K through PID (Proportion Integration Differentiation) closed-loop control; after welding, residual stress and IMC distribution are inversed based on a digital twin heat-force coupling model, and a targeted impact path is generated; switching short pulse laser to combine with a constraint water film to realize impact strengthening, introducing + 800-+ 1200 MPa residual compressive stress, and inducing a nanocrystalline structure; and finally, through hot nitrogen transient drying and ultrasonic closed-loop repairing, joint manufacturing is completed. According to the method, the process period is shortened, the joint tensile strength is improved, and the problems of excessive brittle phases, stress degradation and low efficiency of traditional copper-aluminum welding are effectively solved.

The invention discloses coaxial extrusion type 3D printing hydrogel equipment and application, and belongs to the technical field of 3D printing and geotechnical engineering supporting. Comprising a step-shaped shrinkage structure arranged at an inlet of an outer layer channel of a coaxial spray head and used for uniformly distributing a calcium chloride crosslinking solution and stably and uniformly wrapping an outer layer material; the size compensation factor calculation module is integrated in the control unit and is used for calculating and applying a size compensation factor in real time based on the linear shrinkage rate in each direction of the material and the slicing error so as to realize dynamic precision correction of a printing path; the device further comprises a three-axis mechanical arm control system, a two-way independent precise feeding system and a storage device. Through cooperation of a flow guide part and dynamic compensation, the uniformity, the structural consistency and the forming precision of hydrogel printing are remarkably improved, and the method is particularly suitable for high-precision and high-reliability temporary filling and supporting of complex surrounding rock cracks.

The invention discloses a system and a method for preparing high-pigment carbon black, and belongs to the technical field of carbon black production processes. The system at least comprises: a high-color carbon black production unit, wherein the high-color carbon black production unit at least comprises a carbon black reactor; the carbon black reactor is provided with an ignition part, a coaxial nozzle, a quenching medium nozzle and a reactor outlet; the coaxial nozzle is arranged in the circumferential direction of the carbon black reactor and inserted into the carbon black reactor, the coaxial nozzle comprises an inner pipe and an outer layer outside the inner pipe, and fuel gas and raw oil form a mixture after being sprayed out through the coaxial nozzle and are injected into the carbon black reactor. The fuel gas and the carbon black raw oil are mixed through the coaxial nozzle to form the aerosol, the aerosol is injected into the carbon black reactor to be combusted, the high-pigment carbon black is generated, the overall complexity of a material conveying pipeline and device can be reduced, coking is not likely to be formed, and meanwhile the coloring performance of the prepared high-pigment carbon black is better.