251results about How to "Strong process adaptability" patented technology

The invention discloses an emulsion paint production temperature control management system and method, and relates to the technical field of automatic temperature control. According to the emulsion paint production temperature control management system and method, by arranging the emulsion paint temperature monitoring module, the temperature abnormity module and the temperature adjusting module, accurate temperature control in the emulsion paint production process is achieved. The temperature change of the latex paint in different production stages is monitored in real time through a temperature sensor, a temperature fluctuation curve is generated through time sequence analysis, periodic fluctuation and amplitude characteristics of temperature are recognized based on a spectrum similarity analysis technology, a temperature fluctuation intensity index is calculated, and whether temperature abnormity exists or not is judged by comparing the temperature fluctuation intensity index with a preset threshold value; when the temperature abnormity is identified, the temperature adjusting module dynamically adjusts the power output of the temperature control equipment through a PID control algorithm, and precise temperature control is achieved. The temperature control precision and the stability in the production process are obviously improved, and the quality consistency and the production efficiency of the latex paint are ensured.

The invention discloses a multifunctional automatic tooth socket locking device which comprises a working machine table, and the working machine table is provided with a feeding unit, a feeding station, a wire twisting unit, a detection unit and a discharging unit, and the feeding station, the wire twisting unit, the detection unit and the discharging unit are sequentially arranged around the feeding unit; through the feeding unit, and the wire twisting unit, the detection unit and the discharging unit which are arranged around the feeding unit, the machining process of feeding, assembling, detecting and discharging of product thread sleeve machining can be achieved; the machining effects of automatic material taking, assembling and tail punching of thread sleeve machining are achieved through the twisting unit of a three-axis driving structure; efficient automation is achieved in the machining process, and the machining efficiency and the machining quality can be effectively guaranteed; the secondary detection effect after the thread sleeve is machined can be achieved through the detection unit, and the high-precision machining effect of thread sleeve machining can be ensured; and the assembling equipment can adapt to assembling work of various types of products and various sizes of threaded sleeves, and has the advantages of being high in machining adaptability and wide in machining range.

The invention discloses a high-alloy wear-resistant roller repair welding material, and belongs to the technical field of alloy repair welding. The method is achieved through the three steps of a coal mill roller sleeve, a lining tile deposited metal formula, an alloy element transition coefficient formula and wear-resistant surfacing flux-cored wire preparation. The self-protection flux-cored wire can be suitable for various welding positions, and single-face welding and double-face forming are good; the production efficiency is high, and compared with manual welding, the allowable welding current of the self-protection flux-cored wire is large, and the deposition efficiency is high. According to the method, various hole pattern design methods including a strip steel edge and circumference combined bending method are adopted, the hole pattern of the roller is subjected to improved design, the forming mode of a steel strip on a wire rolling machine is changed, finally, a lap joint O-shaped section is formed, and the quality of the flux-cored wire is improved. The carbide in the welding wire surfacing sample is finer, more in quantity and more regular in arrangement.

The invention relates to the field of activated carbon adsorption boxes, and particularly provides a dust and waste gas treatment device for chemical production. The device comprises a device body, a pretreatment box is arranged on one side of the device body, a dust filtering mechanism is arranged on the inner side of the pretreatment box, the dust filtering mechanism and the dust filtering mechanism on the inner side of the pretreatment box are key components, a first baffle, a second baffle and a third baffle are arranged in a staggered mode, and an S-shaped flow channel is formed; meanwhile, the detachable filter frame and the filter material are arranged in the flow channel and act together to effectively filter dust in the waste gas, and the primary treatment process greatly reduces the treatment burden of the follow-up activated carbon box, so that the treatment efficiency is improved. The treatment effect of the activated carbon box on waste gas containing a certain amount of dust is improved, efficient operation of the whole dust and waste gas treatment device is ensured, and the treatment adaptability to the waste gas is improved.

The utility model discloses a tumbling cutter for rolling finish machining of a metal workpiece, which relates to the technical field of rolling machining cutters, solves the technical problems of lower surface roughness grade, complex structure and smaller machining range in the prior art, comprises a cutter handle, and is characterized in that a pin shaft is fixedly mounted on the cutter handle; a deep groove ball bearing is installed on the pin shaft, a steel ball frame is fixedly installed at the front end of the cutter handle, a steel ball hole is formed in the front end of the steel ball frame, and a hard alloy ball is movably installed in the steel ball hole. Components are few, the structure is simple, manufacturing and maintenance are easy, and production efficiency is improved; the contact surface of the tumbling cutter is small, large pressure can be obtained, equipment load is reduced, abrasion is relieved, and the service life of equipment is prolonged; the deep groove ball bearing serving as a supporting element is small in friction coefficient and beneficial to maintaining the rolling state; and the production flexibility is improved due to the workpieces which can be subjected to roll finishing.

The invention relates to the technical field of aluminum matrix composites, in particular to a double-layer composite wire and a method for manufacturing a high-performance aluminum matrix composite through electromagnetic field regulation and control additive manufacturing of the double-layer composite wire. (2) the additive manufacturing process is regulated and controlled through a three-axis electromagnetic field; and (3) carrying out post-treatment on the prepared aluminum-based composite material. The Al-Ti-B alloy at the core provides an ideal reaction environment for in-situ generation of a TiB2 nanophase, and the Al-Cu-Mg alloy at the shell provides solid solution strengthening elements for a matrix. The layered design not only realizes the spatial separation of the reinforcing phase and the solid solution strengthening element, but also creates conditions for the synergistic effect of two strengthening mechanisms. And secondly, a powerful tool is provided for accurate control over behaviors of the molten pool through introduction of the three-axis electromagnetic field regulation and control technology. The magnetic field intensity and the frequency are independently regulated in the x direction, the y direction and the z direction, and multi-dimensional regulation of flowing, heat transfer and solidification behaviors of the molten pool can be achieved.

The invention relates to the field of cookware materials, and provides a cookware wear-resistant material and a preparation method thereof, and the material comprises the following components: a surface modified dumbbell-shaped silicon carbide filler, a porous silicon dioxide coated silver filler, polytetrafluoroethylene, methyl phenyl silicone resin, an antioxidant 1010 and deionized water. The dumbbell-shaped silicon carbide is prepared by ball milling, spray drying, sintering and hydrochloric acid treatment and then is modified by 3-aminopropyltriethoxysilane. The porous silicon dioxide coated silver filler is prepared by taking polystyrene latex as a template, preparing porous silicon dioxide through a sol-gel method and then reacting silver nitrate with ascorbic acid. The preparation method comprises the steps of dispersing, mixing, coating and curing, the obtained material has excellent wear resistance and antibacterial property and can be widely applied to cookware surface coatings, and the problems that a traditional cookware material is low in wear resistance and poor in antibacterial property are solved.

The invention provides an installation and construction method for large equipment in a process workshop, and belongs to the technical field of plant renoving.The installation and construction method for the large equipment in the process workshop comprises the following steps that according to site conditions, a large equipment transportation path is planned, and a U-shaped steel rail, a sliding trolley and a hydraulic jack are selected; laying brick soil temporary foundations with gradually changing widths along the path to support the U-shaped steel track; equiwide short rails are arranged at the intersections of the rails, and sliding trolleys are arranged at four corners of equipment corresponding to the rails and are hoisted by hoisting equipment; the equipment is pushed to transport along the rail, and turning is realized by locking and unlocking the trolley; after reaching the position, the equipment is lifted, and brick walls are stacked and built layer by layer below to the foundation height; moving to an equipment foundation through a connecting rail, finely adjusting the position after removing the rail trolley, finally installing a bolt fixing device, and dismantling a temporary foundation; the problem that in the prior art, large equipment cannot be installed in a narrow space without a crane can be solved, and the installation cost is reduced.

The utility model provides a pump plate assembly used in a cavity, a cavity and a semiconductor device, the pump plate assembly comprises a pump ring and an air flow control assembly, the pump ring is arranged in a cavity and is provided with an air flow channel used for releasing preset air in the cavity out of the cavity; the airflow channel is provided with a plurality of airflow inlets formed in the face, close to the surrounding area, of the pump ring so that preset gas can be guided into the airflow channel through the airflow inlets to be released, and the airflow control assembly is arranged in the airflow channel. The airflow control assembly communicates with the airflow inlets so as to control the consistency of the flow of gas released after the gas flows through the airflow inlets. According to the pump plate assembly, preset gas release consistency can be achieved, the wafer surface etching uniformity can be improved when the pump plate assembly is applied to a semiconductor cleaning cavity, and good technological adaptability and applicability are met further through flexible design of the structure of the gas flow control assembly. The process stability, the product quality and the yield of the cavity and the semiconductor device are all effectively improved.

This invention discloses a Pickering emulsion based on silk fibroin self-assembled particles and its preparation method. The preparation method includes the following steps: adjusting the pH of the silk fibroin solution to 4.0-4.5, adding NaCl to a final concentration of 0.05-0.1 mol / L, mixing, and then heating to 40-50 °C and allowing it to stand at a constant temperature. Using the obtained silk fibroin self-assembled particle dispersion as the aqueous phase and vegetable oil as the oil phase, the mixture is mixed with excipients and homogenized by high-speed shearing to obtain a primary emulsion. This primary emulsion is then treated by high-pressure microfluidic jet to obtain the Pickering emulsion based on silk fibroin self-assembled particles. This method requires no chemical modification or exogenous reagents, is green and simple, and does not use organic solvents. It can prepare emulsions with high biosafety and high storage stability without emulsifiers, improving process safety and scalability, and broadening its application in the food, cosmetics, and biopharmaceutical fields.

The utility model relates to the technical field of vibration screening equipment, in particular to a square tube cross beam structure with a trapezoid reinforcing plate and vibration screening equipment. The cross beam connecting plates are welded to the two ends of the square tube and used for being connected with a screen frame or an external component; the cross beam trapezoidal plates are symmetrically attached to the side walls of the square tube, and the lower bottoms of the cross beam trapezoidal plates extend outwards to form supporting surfaces; the square plate is fixed at the upper end of the trapezoidal plate of the cross beam and is used for dispersing load; mounting holes are formed in the upper portion of the square plate and used for being connected with a screen bottom beam. The scheme has the advantages of light weight, high fatigue resistance and process adaptability.

The present application belongs to the technical field of carbon fiber composite materials, and particularly relates to a carbon fiber composite material with high-frequency damping performance and a preparation method thereof. Through multi-component synergistic modification of an epoxy resin matrix, a nitrile rubber composition and a boron nitride composition, combined with carbon fiber surface treatment and a segmented curing process, a multi-scale damping energy dissipation network is constructed. The material exhibits excellent damping performance in a high-frequency vibration environment, while also having high mechanical strength and interfacial bonding force, which can significantly reduce the damage risk caused by vibration transmission of sports equipment, and is suitable for high-end sports equipment field, promoting the industrial application of carbon fiber composite materials in high-frequency damping scenarios.

The utility model discloses a numerical control double-shaft drilling and milling tapping device, which relates to the field of numerical control machine tools, and comprises a workbench, the lower surface of the workbench is fixedly connected with a support column, one end of the support column far away from the workbench is fixedly connected with a moving wheel, the upper surface of the workbench is fixedly connected with a protective cover, and a transmission mechanism is arranged in the workbench; a connecting seat is fixedly connected to the lower surface of the fixed seat, a connecting rod is connected to the lower surface of the connecting seat, a drilling and milling head is fixedly connected to the end, away from the connecting seat, of the connecting rod, an electric push rod is fixedly connected to the interior of the drilling and milling head, and a moving piece is fixedly connected to the output end of the electric push rod; the transmission mechanism is embedded in the side wall of the workbench, the connecting base is connected with the connecting rod through the magnetic locking mechanism, the drilling and milling head is made of a carbon fiber composite material and internally provided with a cooling channel, and the effects of the numerical control double-shaft drilling, milling and tapping device which improves the machining precision of the drilling and milling device and is simple in structure and good in heat dissipation are achieved.

The utility model provides automatic punching equipment, which relates to the technical field of punching equipment and comprises a base dislocation assembly and a feeding and discharging part changing mechanism, the feeding and discharging part changing mechanism for bolt assembly is arranged on the top side of the base dislocation assembly, and a punching part for bolt assembly is arranged above the outer side of the base dislocation assembly. The feeding and discharging part changing mechanism comprises a side plate shell, a driving motor, a roller rod, a transmission belt, a bolt bottom plate, a positioning hole plate, a driving lead screw, a sliding frame, a cross arm, a power mechanical arm and a mechanical clamp. The side plate shell is arranged on the top side of the base dislocation assembly. According to the automatic tapping machine, conveying of a workpiece body is achieved mainly through sequential transmission operation of the sliding frame, the cross arm, the power mechanical arm and the mechanical clamp, and after the position of a standby tapping head on a standby sleeve cabin is adjusted, the standby tapping head and a tapping head below a plug-in machine box are replaced. And the device can conveniently adapt to different specifications and sizes, and the machining adaptability of the device is improved.

The present application provides a kind of online quality monitoring method of traditional Chinese medicine in near infrared combined fluidized bed granulation process, the monitoring method will near infrared spectrum (NIRs) technology be combined with partial least squares (PLSr), and the online monitoring model of key quality attribute (CQAs) in granulation process of Buqi Tongluo Granules (BQTL-G) is constructed.Based on the real-time monitoring data of the model, the key process parameter of peristaltic pump speed is dynamically regulated by negative feedback mechanism through PID controller, the bed collapse problem caused by excessive moisture content in the granulation process is accurately intervened, and the granulation process state is stabilized.The online quality monitoring method of the present application solves the quality uniformity problem commonly existing in the production process of traditional Chinese medicine granules.

The utility model discloses a high-rigidity half-moon groove tool rest unit of a combined lathe and the combined lathe, belongs to the technical field of numerical control combined lathes, and solves the problems that a traditional linear guide rail feeding structure is large in occupied space, poor in rigidity and unstable in machining quality. The tool rest unit comprises a tool rest body, and a guide groove is formed in the circumferential face of the tool rest body and axially penetrates through the tool rest body. A sliding groove plate matched with the guide groove is arranged in the guide groove. The sliding groove plate is shorter than the guide groove and used for bearing a cutter. And the section of the guide groove is half-moon-shaped. Limiting plates are installed on the portions, on the two sides of a groove opening of the guide groove, of the tool rest body respectively, and the limiting plates are pressed on the sliding groove plates so as to limit movement of the sliding groove plates in the radial direction. Due to the fact that the sliding groove and the sliding groove plate are arranged on the peripheral face of the tool rest body, occupied space is reduced, and rigidity and transmission efficiency of the whole structure are improved. The tool rest unit is matched with a narrow space scene of a multi-spindle lathe, and the machining requirements of high precision and high efficiency are met.

The invention relates to a bi-crosslinking cyanate ester-epoxy blended adhesive and a preparation method thereof, and relates to the technical field of high polymer materials, the adhesive comprises the following components in parts by weight: 45-85 parts of cyanate ester resin, 5-35 parts of epoxy resin, 0-20 parts of a reactive diluent, 2-6 parts of a bi-crosslinking curing agent and 0-50 parts of a functional filler, the bi-crosslinking curing agent has the following structure: R is alkyl, aliphatic amine or aryl; r'is a primary amino group and / or a secondary amino group, R ''is-C = N and / or-OCN, m is an integer from 1 to 3, and n is an integer from 1 to 2. By adding the double-crosslinking curing agent containing the amino group and the cyano group, the technical problems of high curing temperature, large stress after curing, poor temperature resistance of epoxy resin and the like of the existing cyanate ester resin system are solved, and the curing temperature, the bonding strength and the temperature resistance of the adhesive are balanced. The adhesive can be cured at the temperature lower than 90 DEG C, and has high glass transition temperature, low thermal weight loss and excellent adhesive property.

The utility model discloses a rotary cylinder cooling machine which comprises a cooling machine body, and a plurality of screening mechanisms are arranged at the discharging end of the cooling machine body. The cooling machine comprises a cooling machine body, a supporting frame is fixedly installed at the bottom of the cooling machine body, the discharging end of the cooling machine body is fixedly connected with an annular tongue, and a plurality of positioning rods are arranged on the outer surface of the annular tongue and fixedly connected with the cooling machine body; each screening mechanism comprises a base, and a positioning and clamping assembly is installed on each base. According to the utility model, the supporting frame, the annular tongue, the positioning rod, the base, the positioning and clamping assembly, the stock bin, the mounting ring, the annular filter cartridge, the annular butt joint groove, the positioning hole, the limiting rod and the butt joint tongue are arranged to form an extensible screening unit group, a user can freely increase and decrease the number of screening mechanisms according to the material grading requirement, and each grade of screening mechanism corresponds to different screening hole specifications; the materials can be subjected to multi-stage screening (such as coarse, medium and fine three-stage separation) in single treatment.

This invention provides an aluminum strip embedded textile transition layer connection structure, its preparation method, and its application, belonging to the field of dissimilar material connection and composite material structure manufacturing technology. The connection structure includes a target connecting aluminum plate, an integrated aluminum connector, and a composite material connector. The integrated aluminum connector is composed of multiple embedded aluminum strip segments and a welded substrate segment. The embedded aluminum strip segments are embedded between layers of composite fiber fabric and cured together with a thermosetting resin matrix to form a textile transition layer. The welded substrate segment is exposed outside the composite material connector and forms a metallurgical weld connection with the target connecting aluminum plate. This structure avoids damage to the composite material caused by drilling in traditional mechanical connections, achieves efficient load transfer to the aluminum plate through the textile transition layer and aluminum connector, and improves the load-bearing capacity and reliability of the connection between the composite material and aluminum alloy components. It is suitable for composite-metal hybrid structure connections in aerospace, rail transportation, and automotive lightweighting fields.

The application discloses a kind of invisible optical cable and preparation method thereof, belong to optical cable technical field, including multiple optical fibers, and sleeve is arranged at the periphery of multiple optical fibers, and sleeve is prepared using transparent material.The woven yarn is further provided in the sleeve in the application, and the woven yarn is in mesh structure, and multiple optical fibers are sequentially and side by side arranged in the mesh structure of woven yarn.In the application, the arrangement order of each optical fiber is naturally limited by the mesh structure of woven yarn, and each optical fiber can be accurately distinguished by observing the position of optical fiber in the mesh during construction, without any color marking or special identification equipment, especially suitable for multi-core invisible optical cable.The yarn of woven yarn is extremely thin, and the mesh structure is invisible under normal visibility, the overall transparency of optical cable is high, and it is perfectly integrated with indoor environment, maintaining excellent invisible effect.

The invention provides a control method and system for local gluing of the outer surface of a metal round piece, and belongs to the technical field of intelligent gluing control. The method comprises the following steps: firstly, acquiring a current outer surface image and process task data of a to-be-glued metal round piece, and determining a target local gluing area, a state detection area and a target glue line parameter; releasing detection glue points in a state detection area, acquiring a detection dynamic image sequence, and extracting spreading length, edge expansion rate, necking rate, broken wire time delay and retraction displacement to form a dynamic morphology feature sequence; inputting the dynamic morphology feature sequence into a glue solution rheological state inversion model, and solving a current glue solution rheological state parameter; local gluing is carried out according to the formal gluing control instruction, and a local glue line forming result is output in combination with an outer surface result detection record. According to the method, the current flowing state of the glue solution can be recognized before formal gluing, gluing control parameters are synchronously adjusted according to the current flowing state, and the forming stability of local gluing glue lines on the outer surface of the metal round piece is improved.

The utility model relates to an anti-expansion vapor chamber which comprises an upper shell plate, a first liquid absorbing core, a lower shell plate, a second liquid absorbing core and a working medium, the upper shell plate is connected with the lower shell plate, and the upper shell plate and the lower shell plate are both provided with grooves used for forming an upper inner cavity and a lower inner cavity; a plurality of first supporting columns are distributed in the groove of the upper shell plate, and a plurality of through holes corresponding to the first supporting columns are distributed in the first wick, so that the first supporting columns penetrate through the through holes to mount the first wick in the upper inner cavity of the upper shell plate; a plurality of second supporting columns matched with the first supporting columns are distributed in the groove of the lower shell plate, and a plurality of through holes corresponding to the second supporting columns are distributed in the second wick, so that the two supporting columns penetrate through the through holes to mount the second wick in the lower inner cavity of the lower shell plate; the working medium is phase change liquid flowing in the groove, and heat of the upper shell plate and the lower shell plate is dispersed to the vapor chamber. The vapor chamber provided by the utility model has higher heat dissipation performance, and can overcome the problem that the expansion resistance of the vapor chamber is insufficient in the heat dissipation of the battery.

This invention relates to a method for preparing low-alkali, high-purity silicon-aluminum micropowder from lithium slag, belonging to the field of solid waste recycling technology. The method includes: desulfurization: pulping and desulfurizing the tailings from the sulfuric acid lithium extraction process to obtain gypsum slag and desulfurized lithium slag; classification: classifying the desulfurized lithium slag to obtain coarse and fine particles; potassium and sodium removal and iron removal: removing potassium and sodium from the coarse particles to obtain alkali-rich slag and low-alkali desulfurized lithium slag, then removing iron from the low-alkali desulfurized lithium slag; directly removing iron from the fine particles; and grinding and mixing to obtain low-alkali, high-purity silicon-aluminum micropowder. Based on the specific segregation and enrichment patterns of potassium and sodium minerals in lithium slag, this invention achieves deep dealkali removal through a multi-stage combined process of "desulfurization-classification-potassium and sodium removal-iron removal," resulting in a product with Na₂O + K₂O < 0.5%, meeting the requirements for electronic-grade glass fiber raw materials, while simultaneously achieving full-component resource utilization.

The invention discloses bridge steel structure machining and bending equipment, and relates to the technical field of bridge steel structure machining, the bridge steel structure machining and bending equipment comprises a bottom plate, a vertical plate is arranged at the upper end of the bottom plate, a servo motor is arranged on one side of the vertical plate, the output end of the servo motor penetrates through the vertical plate and is provided with a rotating rod, and a first bearing seat is arranged at the upper end of the bottom plate; two first gears are symmetrically arranged on the outer surface of the rotating rod, a transmission toothed belt is arranged on the outer surfaces of the first gears, a second gear is arranged on the inner surface of the other end of the transmission toothed belt, a first rotating shaft is arranged on the inner surface of the second gear, and a third gear is arranged on the outer surface of the first rotating shaft; and two second bearing seats are symmetrically arranged at the upper end of the bottom plate. According to the bending equipment for bridge steel structure machining, the bending length can be conveniently adjusted, steel structures with different thicknesses can be stably bent, the steel structures are stably clamped before bending, friction is effectively reduced in the bending process, and damage to the surfaces of the steel structures is reduced.

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.

This invention discloses a traction winding and unloading device, belonging to the field of roll material production technology. The device includes a traction device, a floating fly knife device, a dual-shaft alternating winding device, and an unloading device. The traction device has edge trimming and tension adjustment functions. The floating fly knife device is equipped with a floating roller assembly and an L-shaped flipping guide groove to achieve clamping traction during cutting and automatic knife lifting after cutting. The dual-shaft alternating winding device realizes alternating winding of the two air-expanding shafts at two workstations through a flipping disc and a clamping assembly, and is equipped with a moving pressure roller that adjusts with the roll diameter. The unloading device consists of a moving trolley, a shaft pulling device, and an unloading trolley, which can automatically complete full roll grabbing, shaft pulling, air release unloading, and transfer. This invention realizes full-process automation from traction, edge trimming, fixed-length cutting, continuous winding to automatic unloading, and has the advantages of high production efficiency, good cutting and winding accuracy, stable operation, and wide applicability. It is suitable for the continuous production of roll materials such as film, non-woven fabric, paper, and aluminum foil.

The invention relates to a post-treatment method for a mercury-based II-VI group nanocrystal with a protective layer formed by chemical oxidation, and solves the problems of poor stability and photoelectric property degradation of the mercury-based II-VI group nanocrystal caused by surface oxidation, ligand desorption and environmental sensitivity. An oxide protection layer with the thickness of 1-3 nm is formed on the surface of the nanocrystal, the long-term stability and the photoelectric property of the nanocrystal are improved, and the method comprises the specific steps of centrifugal purification of the nanocrystal, preparation of an oxidizing agent solution, controllable oxidation reaction, functional ligand surface modification and purification treatment. The oxidation layer is ensured to be compact and stable by accurately adjusting the concentration of the oxidant, the reaction temperature and the reaction time. According to the method, oxygen and moisture permeation is effectively blocked, surface defects are reduced, the quantum yield and the photoelectric property are improved, and the method is widely applied to the fields of post-treatment of mercury-based II-VI group nanocrystals and photoelectric devices.

The invention relates to the field of aluminum alloy die casting, in particular to a die casting device for aluminum alloy shell machining, which comprises a base, and a tail plate is mounted on one side above the base. The movable mold plate reciprocates in the mold closing process to drive the push rod to drive the piston to move in the sealing tank, so that alternate change of positive pressure and negative pressure is formed in the sealing tank; in the process, the PCL control cabinet cooperatively controls opening and closing of the feeding hole and the discharging hole, automatic extraction and conveying of the liquid raw materials are achieved, and finally the liquid raw materials are injected into the charging barrel. And then, the injection cylinder drives the injection rod to inject the raw materials into the mold closing cavity at high pressure to complete die-casting forming, and the full-automatic process from feeding to forming is achieved. In addition, the screw is driven to move axially by rotating the internal thread cylinder, the initial position and stroke of the piston can be adjusted, and therefore the single suction amount of the sealing tank is changed, the sealing tank can flexibly meet the differentiated requirements of different die-casting parts for the raw material amount, and accurate and controllable feeding is achieved.

The invention discloses a hot-coated high-barrier heavy-wrapping roll film and a preparation method thereof. Belongs to the technical field of packaging materials. The roll film sequentially comprises an outer-layer base material film, a middle barrier layer and an inner-layer heat sealing film. The middle barrier layer is formed by drying and curing nano-composite barrier liquid coated on the inner surface of the outer-layer base material film; the nano-composite barrier liquid comprises polyvinyl alcohol, a surface-modified inorganic nano-material dispersion liquid, a polymer emulsion, a cross-linking agent and a wetting agent. After being preheated, the barrier liquid is coated by micro gravure, is dried through three stages of rapid shaping, deep crosslinking and high-temperature densification in sequence, and is finally compounded with an inner-layer heat-sealing film in a solvent-free manner. Through precise coupling of a synergistic effect among specific components and a multi-stage drying process, the roll film has excellent initial oxygen barrier property, water vapor barrier property, excellent stability in a high-temperature and high-humidity environment and high barrier stability after simulating a dynamic mechanical load of heavy packaging and transportation.