36results about How to "Shorten the setting time" patented technology

The invention discloses low-carbon flow-state solidified soil for a seasonal frozen region. The low-carbon flow-state solidified soil comprises soil, a curing agent and water, the dosage of the curing agent is 15-20% of the mass of the dry soil; the water content is 40-60% of the dry mass of the soil and the curing agent; the soil comprises sludge and building residue soil, and the sludge accounts for 20-40 parts by weight, and the building residue soil accounts for 60-80 parts by weight; the curing agent is prepared from the following components in parts by weight: 40 to 60 parts of phosphogypsum, 10 to 15 parts of mixing plant waste slurry, 20 to 40 parts of steel slag, 5 to 10 parts of quick lime, 0.5 to 1.2 parts of glycerol, 0.2 to 0.6 part of hydroxypropyl methyl cellulose and 1 to 1.5 parts of water reducing agent; according to the invention, various technical problems of insufficient anti-freezing performance, unstable fluidity, long setting time, insufficient early strength, large shrinkage deformation, easy generation of segregation and bleeding and the like of the existing fluid-state solidified soil are solved, and meanwhile, more low-carbon environment-friendly raw materials are introduced, so that multi-aspect improvement of the performance of the fluid-state solidified soil and maximization of environment-friendly benefits are realized; and a more reliable and efficient solution is provided for earthwork such as foundation pit backfilling.

The invention discloses a mineral powder-red mud-desulfurized gypsum-based multi-source solid waste road grouting material as well as a preparation method and application thereof, and belongs to the technical field of solid waste utilization and road grouting reinforcement. The mineral powder-red mud-desulfurized gypsum-based multi-source solid waste road grouting material comprises a multi-source solid waste aggregate and 0.01-0.015 wt% of a water reducing agent mixed in the multi-source solid waste aggregate, wherein the multi-source solid waste aggregate is prepared from the following raw materials in percentage by weight: 40.5-43.5 wt% of red mud, 40.5-43.5 wt% of quick-hardening sulphoaluminate cement, 9-10 wt% of mineral powder and 3-10 wt% of desulfurized gypsum; the mass ratio of the red mud to the quick-hardening sulphoaluminate cement is 1: 1. The mineral powder-red mud-desulfurized gypsum-based multi-source solid waste road grouting material can be hydrated to generate spar with a supporting effect, so that the grouting material has high stone strength in an early stage and high stone strength stability in a later stage, and generated spar particles can interact with a water reducing agent; and meanwhile, the problem of stockpiling of contained solid wastes is effectively solved, and the preparation cost is greatly reduced.

This invention discloses an early-strength, high-stability road grouting repair material and its preparation, belonging to the field of solid waste utilization and road grouting reinforcement technology. The raw materials of the early-strength, high-stability road grouting repair material of this invention include multi-source solid waste aggregates and a water-reducing agent; the multi-source solid waste aggregates, by mass percentage, include: 6.6 wt% fly ash, 5-15 wt% rapid-hardening sulfoaluminate cement, 64-74 wt% mineral powder, 13.4 wt% desulfurized gypsum, and 1% carbide slag. This invention constructs a quaternary solid waste system of fly ash-desulfurized gypsum-mineral powder-carbide slag, synergistically forming a slurry composite system with rapid-hardening sulfoaluminate cement and a water-reducing agent, and precisely controls the concentration of raw materials. During hydration, this system can generate supporting crystals, which not only provide high early-stage stone strength for the road grouting material, but also, due to its good stability, ensure high stone strength stability in the later stages.

The utility model relates to deep hole machining device technical field discloses die casting deep hole finish machining device, including female die, male die, work piece deep hole positioning cavity, extrusion pin mechanism, drive mechanism and deep hole cooling mechanism. Adopt this structure, can move through drive mechanism and push extrusion pin mechanism, force push the metal liquid that has not solidified fills the contraction space, breaks the problem of outer layer solidification hindering make up, and the pressure makes the metal structure of work piece more dense, reduces the blowhole, loose of deep hole setting place, improves air tightness, and simultaneously is provided with deep hole cooling mechanism, and extrusion pin mechanism can quickly absorb the heat of die casting work piece deep hole wall thickness place, accelerates the solidification speed from surface layer to core, shortens the solidification time of die casting work piece deep hole position, and improves cooling uniformity, effectively avoids the problem that the shrinkage cavity leads to the problem that the rejection rate is too high.

The invention relates to the technical field of medical dressings, in particular to a medical dressing for wound care and a preparation method thereof. The medical dressing is prepared from the following raw materials in percentage by mass: 15 to 25 percent of gelatin, 1 to 5 percent of gracilaria lemaneiformis polypeptide-hydroxyapatite compound, 3 to 8 percent of modified hydroxypropyl starch, 0.1 to 0.5 percent of xanthan gum, 0.05 to 0.1 percent of polyethylene glycol and the balance of water. According to the medical dressing disclosed by the invention, components such as the gracilaria lemaneiformis polypeptide-hydroxyapatite compound, the modified hydroxypropyl starch and the like are added into a formula of the medical dressing. The gracilaria lemaneiformis polypeptide-hydroxyapatite compound can effectively shorten the blood coagulation time, so that the wound healing speed is accelerated; and the modified hydroxypropyl starch can effectively improve the long-acting antibacterial effect of the medical dressing.

The application belongs to the technical field of concrete and specifically relates to high-strength long-life marine engineering concrete and a preparation method thereof. The high-strength long-life marine engineering concrete comprises the following components in parts by weight: Portland cement 200-300 parts, fly ash 50-100 parts, mineral powder 50-80 parts, silicon powder 20-50 parts, aggregate 1500-2000 parts, stainless steel fiber 30-40 parts, synergist 5-10 parts, water reducing agent 5-10 parts, and anti-cracking agent 5-10 parts. The synergist comprises aromatic polyamide fiber 50-60%, zirconium oxide 15-30%, anionic surfactant 5-10%, and water 20-30%. The water reducing agent comprises polycarboxylic acid water reducing agent 30-55%, lignin sulfonate 20-30%, film forming agent 5-10%, and water 20-30%. The concrete has improved strength, durability and service life in the marine environment.

This invention relates to the field of vacuum forming machine technology, and proposes a negative pressure integrated vacuum forming machine and method. The machine includes a support platform, a mounting frame fixedly connected to the top of the support platform, a material feeding frame on the inner side of the mounting frame, a lifting mechanism on the inner side of the mounting frame, an infrared heater fixedly connected to the top of the inner side of the mounting frame, and a vacuum forming mechanism below the material feeding frame. The vacuum forming mechanism includes a mold, with an air cavity at the bottom of the inner side of the mold. A three-way pipe communicating with the interior of the air cavity is fixedly connected to the bottom of the mold. One end of the three-way pipe is fixedly connected to an air outlet pipe, and the other end is fixedly connected to an air inlet pipe. A dual-axis motor is fixedly installed inside the support platform. An air extraction component is provided at the outlet end of the air outlet pipe, and an air inlet component is provided at the inlet end of the air inlet pipe. This invention effectively solves the technical defects of traditional vacuum forming machines through uniform negative pressure adsorption in the air cavity, rapid cooling in the annular cavity, non-destructive positive pressure demolding, and integrated power transmission.

The utility model discloses a kind of anti-blocking vacuum cream packaging bottles, including packaging bottle body, sealing screw cap, pressing head and hose, the sealing screw cap is threadedly installed at the top of packaging bottle body, the pressing head is movably installed at the top of sealing screw cap, the hose is fixedly connected at the bottom of sealing screw cap, the outside of pressing head is fixedly connected with extrusion pipe.This anti-blocking vacuum cream packaging bottle, under non-use state, sealing gasket in the inside of baffle is against extrusion nozzle front side closed discharge port, reduce the cream in discharge port and outside air contact, avoid moisture loss, delay cream solidification time, when using, press and push baffle upwards, baffle drives the rotary rod of both sides to rotate around the outside of connecting column, make baffle and sealing gasket go up, open discharge port, make cream extrude and use from discharge port, to delay the solidification time of cream, improve the operation convenience, extrusion nozzle can be rotated from the outside of extrusion pipe, facilitate cleaning when blocking.

The invention relates to the technical field of magnesium phosphate cement materials, and particularly discloses a magnesium potassium phosphate cement-based material with high compactness and high salt corrosion resistance and application of the magnesium potassium phosphate cement-based material. The magnesium potassium phosphate cement-based material is prepared from the following components in parts by weight: 30 to 40 parts of dead burned magnesium oxide, 15 to 20 parts of monopotassium phosphate, 3 to 5 parts of retarder, 0.01 to 0.03 part of crystalline phosphate, 30 to 40 parts of fine aggregate and 8 to 13 parts of mixing water. Wherein the molecular formula of the crystalline phosphate is KNaMg2 (PO4) 2.14 H2O. By introducing the crystalline phosphate in a special structural form, the hydration evolution path and the microstructure of the magnesium potassium phosphate cement-based material in a salt erosion environment are effectively improved, and the salt erosion resistance is remarkably improved.

The application discloses a shotcrete rebound-reducing agent and a preparation method thereof. The shotcrete rebound-reducing agent is prepared from the following raw materials in mass percentage: 15-30% of a quick-setting component, 2-5% of a viscosity-increasing component, 10-15% of a reinforcing component, 2-5% of an anti-freezing component, 1-4% of a stabilizer, and the rest of water; and the viscosity-increasing component is a combination of polyvinylpyrrolidone and modified carboxymethyl cellulose. The prepared shotcrete rebound-reducing agent has the advantages of good sprayability, high hourly strength, good anti-freezing and stability, and the like, can improve the working performance of shotcrete, reduce the content of a quick-setting agent and significantly reduce the rebound rate of shotcrete, and has good economic benefits.

The present invention relates to a die-casting mold and production process of a bimetallic composite hammer head for a hammer crusher, belonging to the field of metal die-casting technology, wherein a replaceable core is installed inside the mold sleeve, a core is installed inside the mold core, and the core and the mold core are combined to form a casting mold cavity, firstly, a mold release agent is sprayed on the surface of the mold core and preheated, the mold core after preheating and expansion is loaded into the mold sleeve, 35# steel melt and high chromium cast iron melt are poured into the mold cavity, the filling speed is controlled until the excess high chromium cast iron melt flows out of the overflow tank, the casting is stopped, and then the hydraulic press is quickly operated to control the upper mold mechanism to press down, and the pressure is maintained for a period of time when the pressure reaches the lowest point, the hydraulic press is operated to lift the upper mold mechanism, the ejector rod ejects the core, and the hammer head after the liquid forging operation is completed is taken out, and the hammer head is placed in a resistance furnace for heat treatment. The internal grain structure of the bimetallic composite hammer head prepared by the present invention is more refined, the carbide distribution is more uniform, the bimetallic interface bonding strength is higher, and the service life is greatly increased.

The shield engineering system comprises a first continuous conveying system, a second continuous conveying system, a second material processing system, a third continuous conveying system and an injection auxiliary system. The first material on the carrier is moved from outside the tunnel to inside the tunnel by the traction rope of the first continuous conveying system. The second material in a fluid state on the belt is moved from inside the tunnel to the pool outside the tunnel by the second continuous conveying system. The second material processing system is used for separating solid material and liquid material in the second material. The third continuous conveying system is used for continuously conveying or uninterruptedly conveying the second material in the pool to the second material processing system. The injection auxiliary system is used for injecting the third material in a fluid state into the surrounding rock and the segment gap of the tunnel. In the shield engineering system, the construction period of the shield construction in the tunnel is greatly shortened, the efficiency of the shield construction in the tunnel is improved, and the cost of the shield construction in the tunnel is reduced.

The invention discloses a difunctional gypsum admixture as well as a preparation method and application thereof, and belongs to the technical field of building material admixtures. According to the invention, vegetable tannin is coated on the surfaces of metal oxide nanoparticles, and another metal ion is coordinated on a tannic acid coating layer to assemble core-shell structure nanoparticles, so that the difunctional gypsum admixture is obtained. The difunctional gypsum admixture provided by the invention can delay the gypsum coagulation time and increase the plasticity time of gypsum slurry, after the admixture accounting for 10-50% of the mass of gypsum is introduced, the initial setting time of the gypsum is prolonged to 20-70 min, meanwhile, the assembly of the core-shell structure gives full play to the synergistic effect of the two high Z elements, efficient shielding of the gypsum to X rays is realized, and the strength of the gypsum is improved. Meanwhile, the problem that metal oxide nanoparticles are difficult to uniformly and stably load on gypsum crystals is solved.

A kind of low vacuum laser welding method for GH4169 high-temperature alloy and SS304 stainless steel, the present application belongs to laser welding technical field.The present application solves the problem that the existing welding method cannot realize the low-cost and high-quality connection of medium thickness and above GH4169 alloy and SS304 stainless steel.One, welding assembly;Two, low vacuum laser welding;Three, heat treatment.The present application is used for the low vacuum laser welding of GH4169 high-temperature alloy and SS304 stainless steel.

The utility model discloses an integrated straightening comb, including control portion, with control portion electricity connection's straightening portion, the power connection portion of providing power supply to control portion and assembly control portion, straightening portion and shell, straightening portion is provided with first comb row, second comb row, heating portion and refrigeration fan, and second comb row assembly is in first comb row, and first comb row is provided with a plurality of first comb teeth, and second comb row is provided with a plurality of second comb teeth and second comb row, and second comb tooth is perpendicular to connect with second comb tooth, heating portion is controlled by control portion, is used to first comb row heating, and refrigeration fan is controlled by control portion, is used to second comb row cooling, compared with depending on natural cooling or external blow, the coupling structure of the application significantly shortens straightening setting time and improves consistency.

The invention relates to the field of concrete preparation, in particular to concrete containing sandy slate aggregate and a preparation method of the concrete. The sandy slate aggregate is prepared from the following components in parts by weight: 75 to 100 parts of ordinary Portland cement, 20 to 40 parts of fly ash, 1280 to 1380 parts of sandy slate low-strength aggregate, 300 to 500 parts of medium-strength aggregate, 0.5 to 1.0 part of carboxymethyl hydroxyethyl cellulose, 5 to 10 parts of fine ground gypsum powder, 0.8 to 1.2 parts of polycarboxylate superplasticizer, 0.1 to 0.2 part of air entraining agent and 70 to 110 parts of water. Wherein the granularity index B1 of the sandy slate low-strength aggregate is controlled to be 2.5-2.8, and the shape index S1 of the sandy slate low-strength aggregate is larger than or equal to 0.70. According to the invention, the void ratio is reduced by optimizing the aggregate gradation and the grain shape, and the water consumption and the cementing material consumption are obviously reduced on the premise of ensuring the workability and the strength.

The application relates to a full-solid-waste high-activity composite admixture and a preparation method thereof, raw materials of the full-solid-waste high-activity composite admixture comprising: mixed-milling micro-powder of steel slag tailings and refining slag, and slag micro-powder; wherein the content of the mixed-milling micro-powder is 20-30 parts by weight, and the content of the slag micro-powder is 70-80 parts by weight. Through the synergistic effect of the raw material re-mixing, the activity of the admixture is improved, the stability of the chemical performance index of the admixture is ensured, the use proportion of the admixture in cement and mortar is improved, the consumption of cement is saved, and then the cost is reduced. The metallurgical industrial solid waste such as steel slag tailings, refining slag, blast furnace slag and the like is realized to be resourcefully utilized, and the problem that long-term stacking occupies land and cannot be absorbed is solved.

This invention discloses a phosphorus slag-based cementitious material, its preparation method, and its application, specifically relating to the field of cementitious materials technology. The cementitious material, by weight, comprises the following components: 60-90 parts phosphorus slag powder; 5-25 parts fly ash; 5-15 parts activator; 0.25-1.5 parts early-strength agent; and 0.2-0.5 parts water-reducing agent; wherein the specific surface area of ​​the phosphorus slag powder is 400-550 m². 2 / kg, particle size (D) 90 The particle size is 20-40 μm; the early-strength agent is selected from at least one of iron salts and aluminum salts. This invention uses phosphorus slag micro-powder with a specific specific surface area as the main substrate, with a high dosage, combined with fly ash, activator, early-strength agent, and water-reducing agent to obtain phosphorus slag-based cementitious materials. By optimizing the physical properties of the phosphorus slag micro-powder and constructing a suitable composite activator-early-strength system, the 28-day compressive strength of the cementitious material reaches over 61.0 MPa, achieving a balance between "high phosphorus slag content" and "high strength".

The invention discloses a bridge expansion joint low-carbon quick-hardening early-strength repairing material and a construction method thereof, and belongs to the technical field of engineering construction. The low-carbon quick-hardening early-strength repairing material for the bridge expansion joint is prepared from the following raw materials in parts by weight: sulphoaluminate cement, Portland cement, calcined shell powder, fly ash and silica fume. Reinforced modified fibers, modified shell powder and a water reducing agent. By treating the shell powder and the reinforced fibers, the setting time and the initial strength maturation period of the concrete can be shortened, so that the construction speed and efficiency are improved, the repairing and reinforcing process of the bridge expansion joint is accelerated, the construction period is shortened, and the engineering cost is reduced. The low-carbon quick-hardening early-strength repairing material for the bridge expansion joint can improve the strength and durability of a repairing layer and effectively guarantee safe operation of a bridge, and meanwhile, quick-hardening construction can shorten the traffic interruption time and guarantee quick and normal traffic of a road.

The application discloses a kind of high-performance cement clinker based on lithium residue ion doping and crystal form regulation and its preparation method and application, belong to cement building material technical field.The raw material of the cement clinker includes the following mass percentage fraction: lithium residue 20~40%, calcium carbonate 50~70%, dihydrate gypsum 10~20% and di-aluminum oxide 2~6%;The minerals in the cement clinker include: C4A3:20%~35%, C2:50%~65%, C:5%~15%, the remainder is inevitable impurities by mass percentage.After the above raw materials are slurried with water, pressure forming is carried out, two-stage heating is sequentially carried out once sintering, and then quenching is carried out, and the cement clinker is obtained.The cement obtained from the cement clinker has excellent fast-setting and fast-hardening properties, and the compressive strength can reach more than 25MPa at 6h, and the compressive strength at 1d can reach more than 40MPa, which fundamentally solves the technical problems of poor early hydration performance, low strength and reverse shrinkage of high belite sulphoaluminate cement in the prior art.

The utility model belongs to the technical field of roller casting equipment, and particularly relates to multi-channel type roller casting equipment which comprises three casting equipment bodies, a base is arranged at the bottoms of the casting equipment bodies, three auxiliary plates are evenly connected to the top end of the base, and the three auxiliary plates are arranged on the base. An annular groove is formed in the top end of the auxiliary plate, and through holes are formed in the top end of the base and the top end of the auxiliary plate. The multi-channel type roller casting equipment has the advantages that bubbles in pouring liquid are effectively promoted to rise to the surface and break, and therefore the defects of bubbles, gaps, air holes and the like in a casting after the pouring liquid is solidified are remarkably reduced; the compactness and the overall quality of the casting are improved, the pouring liquid is more uniform in the solidification process due to vibration, and the phenomena of stress concentration and non-uniform solidification caused by local premature solidification are avoided. The mechanical performance of the casting can be improved, and the surface quality and the size precision of the casting can be improved.

The application discloses a dynamic control method for accelerating ingot solidification process, and belongs to the technical field of ingot solidification production. The dynamic control method is characterized by the following steps: helium gas is introduced into the air gap between the poured ingot and the pouring mold for cooling; the cooling flow and pressure of the introduced helium gas are dynamically adjusted in real time according to the cooling condition of the ingot core, so that the temperature of the ingot core is rapidly reduced, thereby accelerating the solidification process of the ingot and improving the internal quality of the ingot. The dynamic control method for accelerating ingot solidification process is characterized by the following steps: firstly, the best data database is constructed by using the process parameters of the pressure and flow rate of the helium gas introduced into the air gap between the ingot and the metal mold; secondly, the process parameters of the pressure and flow rate of the introduced helium gas are compared with the corresponding database data to obtain the helium gas cooling parameter deviation value; and finally, the pressure and flow rate of the introduced helium gas are adjusted according to the judgment result.

This invention relates to the field of continuous casting equipment for metal materials, and discloses a modified large-diameter crystallizing wheel, including a crystallizing wheel body. The crystallizing wheel body has casting grooves along its outer circumference, and a steel strip is wound around the outer diameter of the casting grooves. A central water collection seat is located at the center of the crystallizing wheel body. A heat insulation plate is fixedly installed inside the central water collection seat, and the interior of the central water collection seat is divided into an inlet chamber and a return chamber by the heat insulation plate. A spiral cooling groove is formed inside the crystallizing wheel body, and an annular return water groove is formed inside the crystallizing wheel body near the inner side of the spiral cooling groove. This invention, through multi-layer sealing, double-layer cooling, flexible clamping, and stable support design, significantly improves sealing reliability and cooling uniformity, avoids steel strip misalignment and billet defects, extends equipment life, reduces maintenance costs, is suitable for large-diameter multi-material continuous casting, and significantly improves product qualification rate.

The invention discloses a method for reducing the shrinkage cavity depth of an electroslag remelting steel ingot. The method comprises the following steps: preparing a special-shaped consumable electrode with a thick lower part and a thin upper part; selecting slag charge with alkalinity of more than or equal to 5 and viscosity of less than or equal to 0.08 Pa.s; welding the thin end of the consumable electrode with the dummy electrode; lowering the consumable electrode until the thick end of the consumable electrode reaches the bottom in the crystallizer, and adding slag into the crystallizer for slagging after arcing; smelting is started after the slag is cleared; the feeding amount is 4-6% of the weight of the steel ingot, the feeding current is reduced to 40-60% of the normal smelting current, and the feeding time accounts for 15% of the total smelting time. According to the method, the novel special-shaped consumable electrode with the thick lower part and the thin upper part is used, the high-alkalinity and low-viscosity slag charge is selected, and the current is reasonably reduced in the feeding process, so that the head shrinkage cavity is fully filled with the molten liquid, the effect of reducing the shrinkage cavity depth is achieved, the shrinkage cavity depth is reduced by more than 20mm, and the yield of the electroslag remelting steel ingot is remarkably improved.

The invention provides a blood coagulation detection chip and a blood coagulation detection method. The invention relates to the technical field of microfluidics. A blood coagulation detection chip comprises a vibration base; the first sliding layer comprises a first detection area which is configured to contain first liquid, the second sliding layer comprises a second detection area which is configured to contain second liquid, the first sliding layer is fixedly arranged on the vibration base, and the first sliding layer is in sliding connection with the second sliding layer; the first liquid is one of blood and a detection solution, and the second liquid is one of the detection solution and the blood corresponding to the first liquid; wherein the second sliding layer is configured to slide to a preset position relative to the first sliding layer, and the preset position represents a position where the first detection area is aligned with the second detection area; the vibration base is configured to drive the first sliding layer to vibrate by releasing vibration, so that the first liquid in the second detection area is mixed with the second liquid in the first detection area, and blood coagulation detection is carried out.

The invention discloses a shaping hair straightener. The shaping hair straightener comprises an upper hair clamping assembly and a lower hair clamping assembly, wherein the rear end of the lower hair clamping assembly is hinged to the rear end of the upper hair clamping assembly; the upper hair clamping assembly and the lower hair clamping assembly each comprise a refrigeration module and a heating module, the refrigeration modules are provided with liquid cooling or air cooling heat dissipation systems, and therefore rapid hair straightening and shaping are achieved. According to the shaping hair straightener, the heating modules and the refrigerating modules are arranged on the upper hair clamping assembly and the lower hair clamping assembly front and back, in the hair straightening process, the heating modules firstly conduct heating shaping, the refrigerating modules conduct refrigerating shaping, heating and refrigerating are conducted front and back at short intervals, the shaping time of straight hair is shortened, the maintaining time is longer after shaping, and the shaping effect is better. And meanwhile, the refrigeration module is used for rapidly cooling the heated hair, so that damage to the hair caused by too high hair straightening temperature can be avoided, and the natural, straight, smooth and glossy hair straightening and shaping effects are achieved.

The application discloses a kind of underwater shotcrete construction technology, including forming a low resistance work area in the underwater side of work surface, concrete is shot from the inside of low resistance work area to work surface, complete reinforcement repair construction;Resistance reducing agent is mixed with compressed gas and then sprayed to form air curtain, for low resistance work area, resistance reducing agent mass concentration is 0.01-0.65%, compressed gas is compressed air with air pressure 0.3~1.5MPa;Interface release agent is added when mixing concrete, its dosage is 0.1~0.5% of the mass of cementitious material, early strength alkali-free accelerator is mixed with pressure gas to form a mixture, after mixing concrete is completed, it is mixed with the above mixture before entering low resistance work area and then sprayed out.The application creates a low resistance work area underwater, reduces the dispersion risk of concrete resistance to water during the spraying process;At the same time, combined with the high cohesion and fast setting performance of shotcrete material, the thickness and compactness of one spraying are improved, and the construction of underwater shotcrete is realized.

The invention provides a visual dispensing device for a semiconductor PCB, and relates to the technical field of dispensing devices. A switching part is arranged outside the adjusting part; a dispensing part is arranged outside the switching part; a fixed block is fixed on a lifting frame, so that a dispensing gun can be conveniently moved to a dispensing position of a PCB (Printed Circuit Board) to facilitate dispensing treatment, and a dispensing part is fixed on two groups of driving toothed plates, so that the two groups of driving toothed plates can be conveniently reversely adjusted under the control of a torsion gear to conveniently switch while moving a single group; according to the glue dispensing device, the laying cost of equipment is reduced, abrasion is reduced by shortening the moving path, and the problems that in order to prevent glue materials from flowing before solidification, a circle of blocking glue layer needs to be added around a component in the glue dispensing process, various glue materials need to be controlled through a plurality of groups of glue dispensing assemblies, and the glue dispensing efficiency is low are solved. And the working loss of the dispensing assembly is easily increased due to frequent switching of the glue materials in the dispensing process.

The application discloses an aluminum-based graphene material and a preparation method, and aims to solve the technical problems of poor interface wettability of graphene and an aluminum matrix, easy agglomeration, secondary agglomeration in a solidification process and difficulty in continuous production. A nano copper coating layer is formed on the surface of graphene through chemical copper plating, so that the interface wettability is improved. The copper-coated graphene powder is uniformly dispersed in an aluminum melt through ultrasonic field and electromagnetic field composite dispersion or synchronous feeding of jet deposition, and then rapid solidification forming is carried out through a Castex continuous casting and extrusion or jet deposition and continuous extrusion integrated process, so that the uniform distribution and densification of graphene in the aluminum matrix are realized. The application is mainly used for high-conductivity and high-strength aluminum-based graphene materials required in the fields of new energy vehicles, 5G communication, rail transit and the like.