37 results about "Vacuum mixing" patented technology

The invention provides a scintillator film for a real-time X-ray dosimeter as well as a preparation method and application of the scintillator film. The preparation method comprises the following steps: weighing Eu (NO3) 3.6 H2O, Tb (NO3) 36H2O, Lu (NO3) 36H2O, NaF and NH4F to prepare powder B; preparing a rare earth fluoride material C from the powder B; weighing a polydimethylsiloxane prepolymer and a curing agent, adding the polydimethylsiloxane prepolymer and the curing agent into a cyclohexane solution, and performing ultrasonic dispersion to obtain a mixture D; adding the rare earth fluoride material C and PMMA particles into an ethanol solution, and uniformly dispersing to obtain a mixture E; dropwise adding the mixture E into the stirred mixture D, and performing vacuum mixing to obtain a mixture F; and transferring the mixture F to the surface of a ceramic plate which is respectively cleaned by water, ethanol and acetone and dried, coating to form a thin film, heating and annealing, and cooling to obtain the flexible scintillator thin film NaLuF4: Tb < 3 + > / Eu < 3 + > coated PDMS which is used for a real-time X-ray dosimeter.

The invention discloses a high-melting-point high-temperature lead-free environment-friendly soldering paste and a preparation method thereof. The soldering paste is composed of 85-89% of alloy powder and 11-15% of flux paste. The alloy powder comprises the following components in percentage by weight: 0.5 to 7.0 percent of tin, 0.2 to 3.0 percent of silver, 0.2 to 1.5 percent of copper, 0.5 to 5.0 percent of nickel, 0.02 to 0.8 percent of antimony and the balance of bismuth. A high-boiling-point solvent, modified resin, an active agent containing an antioxidant and a thixotropic agent are adopted in the flux paste, and the flux paste and the alloy powder are prepared into the soldering paste through a vacuum mixing technology. The problem of high-temperature secondary melting of traditional lead-free solder is solved, and the lead-free solder is suitable for high-temperature welding scenes such as ICs and power devices.

The invention relates to the field of food processing equipment, in particular to vacuum mixing equipment for cheese products in process, which comprises a mixer, stirring blades are divided into a first-stage blade, a second-stage blade and a third-stage blade, the second-stage blade and the third-stage blade are telescopically arranged in the first-stage blade along the horizontal direction, and the second-stage blade and the third-stage blade are arranged in the second-stage blade along the horizontal direction. The third-stage blade is telescopically arranged in the second-stage blade in the horizontal direction; the rotating shaft is sleeved with a driving gear in the horizontal direction, the rotating shaft is integrally sleeved with an adapter, the side, close to the rotating shaft, of the adapter is integrally connected with a driven gear, the driven gear is connected with the driving gear in a meshed mode, and a first driving screw is installed on the stirring blades in the horizontal direction; the first driving screw rod sequentially penetrates through the first-stage blade, the second-stage blade and the third-stage blade, and the end part of the first driving screw rod penetrates through the adapter and is connected with the corresponding driven gear. The purpose of the invention is to effectively guarantee the processing quality of cheese products.

The application provides a vacuum mixing process optimization method and system, which comprises collecting mixing container cavity pressure, jacket temperature, material torque, stirring speed, and air extraction flow signal, calculating pressure change rate, torque fluctuation amplitude, air extraction amount per unit time, and pressure fluctuation characteristic quantity, dividing the vacuum mixing process into four stages of initial exhaust, bubble release, viscosity climb, and densification stability; in the initial exhaust section, the vacuum valve opening degree and time length are controlled according to the air extraction amount and the pressure change rate, and the pressure response delay is recorded; in the bubble release section, an air extraction and stop alternating sequence is generated, and the air extraction and stop time length is corrected in combination with the delay; in the viscosity climb section, the target pressure interval is determined according to the torque, temperature, and pressure change rate, and the speed and valve opening degree are cooperatively adjusted to stabilize the pressure; in the densification stability section, a stability criterion is constructed, and the valve opening degree is controlled as needed; when adjacent stages are switched, the target pressure starting point, valve opening degree initial value, speed initial value, and control period of the next stage are corrected according to the end parameters of the previous stage.

The invention relates to the technical field of magnetic core manufacturing, and discloses a micro radio frequency conical inductor magnetic core cold press molding process and module device.The micro radio frequency conical inductor magnetic core cold press molding process comprises the following steps that a soft magnetic material is mixed with 3-5 wt% of PVA and 0.2-0.5 wt% of zinc stearate, uniform mixing is conducted through a vacuum mixer to form a uniform mixture, internal air is exhausted, and the density of the uniform mixture is made to be uniform and compact; a magnetic core forming die is adopted and comprises an upper punch, a lower punch and a female die assembly, the upper punch and the lower punch are both made of powder steel, a female die is a piece of hollow special steel, and the evenly-mixed mixture is injected into the female die. According to the method, the axial density deviation of the magnetic core is smaller than or equal to 2% (the traditional uniaxial pressing deviation is usually larger than 5%) through the vacuum mixing and biaxial gradient pressurizing process and in cooperation with a 19.6 + / -0.1-degree taper angle mold. The vacuum material mixing eliminates uneven pores caused by bubbles, the biaxial pressurization enables the powder to be directionally compressed along the taper, the industrial problems of edge looseness and center compactness are solved, and a foundation is laid for low loss (eddy current loss of 0.018-0.022) of the high-frequency inductor.

The invention relates to the technical field of seasonings, and particularly discloses a composite sausage seasoning and a preparation method thereof. The seasoning is prepared from edible salt, isomaltooligosacharide, sodium glutamate, a yeast extract, shiitake mushroom powder, spices, red yeast rice powder, a rosemary extract, nisin, trehalose, curdlan, fermented celery powder, epsilon-polylysine and the like according to a specific ratio. The preparation method comprises the steps of basic raw material mixing, microencapsulation slow-release treatment, stage mixing, spice adding and the like, curdlan is used for embedding the rosemary extract, the slow-release effect is achieved, and a vacuum mixing technology is adopted for ensuring uniformity. The seasoning provided by the invention has synergistic antibacterial and antioxidant properties, can significantly prolong the shelf life of sausages, enhance flavor level and umami strength, maintain salty taste perception while reducing the sodium content, improve the product texture and processing stability, and meet the production requirements of natural and healthy meat products.

The utility model discloses sausage stuffing vacuum stirring device, including the blender, the blender inside rotation is connected with two groups of rotating shafts, the rotating shaft outside rotation is connected with a plurality of groups first rotating link, first rotating link outside fixed connection has the stirring piece, first rotating link one end fixed connection has the connecting gear, the connecting gear one side is connected with the rack, the rack sliding connection is in the rotating shaft outside, the rack one end penetrates the blender fixed connection has the connecting plate, the connecting plate inside screw thread connection has the first screw rod, first screw rod tail and blender rotation is connected, can change the angle of stirring blade according to different types of meat stuffing, can aim at the real -time change of material characteristic in the process of stirring sausage stuffing.

The invention discloses a high-heat-conductivity and high-latent-heat phase change heat conduction material and a manufacturing method thereof. The material comprises the following components in percentage by weight: 5%-8% of resin, 5%-10% of wax, 5%-10% of fatty acid, 0.01%-1% of an antioxidant and the balance of modified heat-conducting powder, wherein the modified heat-conducting powder is obtained by carrying out intercalation treatment on heat-conducting powder by an intercalator and carrying out modification treatment by a silane coupling agent. The preparation method comprises the following steps: carrying out ball milling on heat-conducting powder and an intercalator for intercalation treatment; then reacting with a silane coupling agent to carry out secondary modification; heating and mixing the resin, the wax, the fatty acid and the antioxidant to obtain a liquid mixture; adding modified heat-conducting powder and performing vacuum mixing; after compression molding, cooling and cutting to obtain a finished product. Through a co-processing strategy of intercalation and secondary modification of the silane coupling agent, the problems of easy agglomeration and weak interface bonding of the heat-conducting filler are effectively solved, and the prepared material has high heat conductivity coefficient and high latent heat density, is excellent in cycling stability, and can meet the thermal management requirements of high-end devices such as 5G base stations and new energy automobiles.

This invention discloses a grout color mixing machine, comprising a frame, a vacuum mixing device mounted on the frame, and a dispensing and filling device. The frame includes a table and a first support and a second support mounted on the table. The vacuum mixing device includes a mixing tank, a lifting mechanism mounted on the first support, a mixer driven by the lifting mechanism, and a vacuum pump. The mixer includes a sealing cover, a mixing motor mounted above the sealing cover, and a mixing head mounted below the sealing cover. This grout color mixing machine can thoroughly and evenly mix pre-mixed grout while eliminating air bubbles during the mixing process. It also allows for convenient dispensing and filling of the mixed grout into grout dispensing containers. It has the advantages of reasonable structure, simple operation, high mixing and filling efficiency and quality, and enables grout color mixing and dispensing in locations other than factories, such as retail stores.

The utility model relates to a beef flavor food fragrant Maillard thermal reaction feeding device which comprises a reaction tank and a vacuum mixing tank for feeding the reaction tank, the upper end of the vacuum mixing tank is provided with an enzymatic hydrolysate inlet and a blending agent inlet, the upper end of the vacuum mixing tank is fixedly provided with a vacuumizing pipe communicated with an inner cavity of the vacuum mixing tank, and the lower end of the vacuum mixing tank is fixedly provided with a vacuumizing pipe communicated with the inner cavity of the vacuum mixing tank. The bottom end of the vacuum mixing tank is provided with a prepared material outlet, the prepared material outlet is connected with the reaction tank through a pipeline, the side wall of the vacuum mixing tank is fixedly provided with a connecting frame, the connecting frame is connected with a bracket, and a pressure sensor is arranged between the connecting frame and the bracket. According to the device, vacuum injection is performed in the vacuum mixing tank, so that powder can be prevented from being hung on the wall and hardened; during vacuum material injection, the whole vacuum material mixing tank is weighed, so that the weighing is accurate; the time for injecting and weighing the blending agent is saved, and the efficiency of the whole process is improved; and the blending agent is washed by using the enzymatic hydrolysate, so that the materials are uniformly mixed, and the unsmooth injection of the blending agent and the injection dosage deviation are prevented.

The utility model discloses a vacuum mixing tank. The vacuum mixing tank comprises a tank body, wherein an inner cavity used for containing materials is formed in the tank body, the tank body rotates around a rotating shaft and is used for being driven to rotate around the rotating shaft, and an included angle is formed between the rotating shaft and the center axis of the tank body. According to the utility model, materials can be fully mixed through rotation of the tank body, so that dead angles of mixing can be avoided, the mixing efficiency can be improved, and the time for fully mixing the materials is saved.

The invention discloses a novel powder-liquid vacuum mixing system which comprises a vacuum mixing tank, a vacuum pump set, a plurality of powder feeding pipelines, a liquid feeding pipeline and a material circulating pipeline, and the powder feeding pipelines are connected with feeding ports formed in the vacuum mixing tank. The liquid feeding pipeline is connected with a liquid inlet formed in the vacuum mixing tank, a weighing sensor is arranged at the bottom of the vacuum mixing tank, one end of the material circulating pipeline is connected with a discharging port formed in the vacuum mixing tank, and the other end of the material circulating pipeline is connected with the heat exchange assembly and the casein conversion tank. The connecting mode of the feeding valve and the vacuum mixing tank is redesigned, the feeding valve is directly welded to the tank wall of the vacuum mixing tank, and the problems that mixing is not uniform, water is stored, and a powder inlet is blocked due to powder moisture are solved; the flow blocking cover and the spoiler are arranged in the vacuum mixing tank, so that liquid can be guided into the shearing head, and self-absorption is realized under the function of spoiler, so that the mixing effect of the material liquid is improved.

The application relates to the technical field of composite resin preparation, and discloses a silicon-molybdenum alloy target material preparation method, which comprises the following steps: raw material preparation, selecting molybdenum powder and silicon powder with a purity not less than 99.9%, mixing treatment, placing the raw material into a vacuum mixing machine, vacuumizing to 0.01-0.1 Pa, stirring for 1-5 hours, ultrasonic-assisted oxidation prevention with temperature control at 25-40 DEG C, forming process, loading the mixed powder into a detachable hard alloy mold coated with a 0.05-0.2 mm boron nitride coating, cold-pressing forming, keeping pressure for 5-20 minutes to obtain a green body, sintering process, loading the green body into a vacuum sintering furnace, microwave-assisted heating first, then heating to 1500-1800 DEG C, later controlling the structure by feeding trace argon, post-processing procedure, numerically controlling the sintered target material, chemical cleaning by using a mixed solution of hydrofluoric acid and nitric acid, then plasma treatment, and finally vacuum packaging with high-purity nitrogen. The raw material has high purity and good granularity; the mixture is uniform and oxidation is prevented; the forming and sintering are accurately controlled, the target material quality is guaranteed; the post-processing improves the surface performance, the packaging prevents oxygen and moisture, and the target material meets the needs of high-end industries.

The invention discloses a food-grade silica gel coating of an integrated anti-skid mute coffee cup and a preparation method of the food-grade silica gel coating, and provides a structural design of replacing an additional part with the whole silica gel coating aiming at the problems that a traditional anti-skid rubber ring is easy to fall off and hide dirt. A food-grade double-component addition type silicone rubber formula and a vacuum mixing and low-temperature curing process are adopted, and customized pre-activation treatment of ceramic, glass and plastic base materials is matched, so that high adhesive force of the coating and the base materials is realized; a degradable silica gel modification scheme is introduced, so that the coating has multiple-effect synergistic advantages of skid resistance, silence, food-grade safety, wear resistance, environmental protection and degradability, is adaptive to coffee cup food contact scenes, and is suitable for large-scale production.

The utility model relates to the technical field of coffee machines, in particular to a vacuum coffee machine, a coffee bean quantifying structure of the coffee machine, a vacuum mixing structure, a sealing structure of the vacuum coffee machine and a coffee making method based on the vacuum coffee machine. The vacuum mixing structure comprises a processing structure, the processing structure comprises an integrated container, a blade assembly, a sealing and fixing cover and a rotating power device, the sealing and fixing cover completely shields an opening in the top end of the integrated container, and the integrated container is provided with a heating device, a rotating shaft hole, a water inlet, an air exhaust hole and a bottom outlet. According to the utility model, coffee beans and the like are ground, heated and extracted in a unique sealed space, and the opportunity that coffee powder is transferred among different units and is in contact with oxygen in air is avoided or reduced, so that the oxidation effect can be minimized, and the storage of volatile grease, antioxidants and enzymes in the coffee powder and the like can be maximized.

The invention belongs to the technical field of high polymer materials, and relates to a flame-retardant epoxy resin casting material and a preparation method thereof. The invention provides a preparation method of a flame-retardant epoxy resin casting material, which comprises the following steps: dissolving dimethyl polysiloxane in a lipophilic solvent, then dropwise adding onto aluminum oxide powder while stirring, and heating in a nitrogen atmosphere to obtain PDMS (Polydimethylsiloxane) modified aluminum oxide; mixing epoxy resin and silica powder in vacuum to obtain a resin mixture; mixing silane coupling agent modified DOPO, the PDMS modified aluminum oxide and an anhydride curing agent in vacuum to prepare a curing agent mixture; and performing vacuum mixing on the resin mixture and the curing agent mixture to obtain the castable. The PDMS modified aluminum oxide and the silane coupling agent modified DOPO are adopted, so that the electrical performance and the mechanical performance of the flame-retardant epoxy resin casting material are synergistically improved.

The invention discloses a whisker-reinforced high-temperature-resistant and acid-corrosion-resistant artificial stone and a preparation method thereof. The artificial stone is prepared from 65-90% of anhydrous calcium sulfate whiskers, 10-35% of unsaturated resin and a curing agent, and is characterized in that the whiskers are roasted at 620-650 DEG C, the length-diameter ratio is 5-40, and the proportion of the whiskers with the length of 150-300 microns is larger than or equal to 90%. According to the preparation method, sectional vacuum mixing and a specific two-stage vacuum vibration exhaust process are adopted, and a step heating curing procedure is matched, so that the final product simultaneously meets the following conditions: (a) after heating for 2 hours at 250 DEG C, the bending strength is greater than or equal to 40 MPa, and the strength retention rate is greater than or equal to 95%; (b) no blackspot exists on the surface after being contacted with 50% sulfuric acid for 24 hours; and (c) the deformation rate of the base material is less than or equal to 0.03 mm / m when the heat transfer printing process at the temperature of 200-230 DEG C is adapted. The product is particularly suitable for the field of high-end heat transfer printing decoration, the excellent effects that the adhesive force is larger than or equal to 5.0 MPa and the pattern resolution is larger than or equal to 400 dpi can be achieved under the technological conditions that the temperature is 190-230 DEG C and the pressure is 0.5-0.8 MPa, and the technical problem that traditional artificial stone cannot tolerate the high-temperature processing environment is solved.

The utility model relates to the technical field of vacuum mixing, in particular to a multi-component constant-proportion vacuum mixing device which comprises a stirring barrel, two feed ports are formed in the top of the stirring barrel, a discharge port is formed in the bottom of the stirring barrel, two storage barrels are fixedly mounted at the top of the stirring barrel, discharge pipes are fixedly connected to the bottoms of the storage barrels, and the discharge pipes are fixedly connected to the bottom of the stirring barrel. A feeding mechanism is mounted between the stirring barrel and the two storage barrels, the feeding mechanism is communicated with the discharging pipe and the feeding opening, and a stirring assembly is mounted in the stirring barrel; the feeding mechanism is fixedly provided with two sealing mounting cylinders, a first piston, a second piston, a push rod, a first baffle, a second baffle and a spring, and the two sealing mounting cylinders are fixedly connected to the top of the stirring barrel. According to the utility model, the problems that the glue discharging ratio of A and B materials is imbalanced and the performance of the mixed insulating glue is poor due to the aperture change caused by residual glue of the glue discharging nozzle are effectively solved.

The utility model discloses a paraffin phase change material vacuum mixing and stirring tank, which comprises a tank body and a preheating mechanism, the upper end of the tank body is fixedly connected with a support frame, the upper end of the tank body is rotatably provided with an end cover, the upper end of the support frame is provided with a motor, and the motor is connected with the preheating mechanism. An output shaft of the motor is fixedly connected with a transmission shaft, the transmission shaft is connected with a rotating shaft through a first synchronous belt, the lower end of the rotating shaft is fixedly connected with a stirring rod, and the lower end of the tank body is fixedly connected with a discharging port. Stirring and preheating are synchronously carried out, an additional power source is not needed, and the working efficiency is improved.

This invention relates to the field of mixing device technology, specifically a vacuum mixing material preparation device, including a cylinder, a cylinder cover, a rotating shaft, a mixing paddle assembly, a counterweight compensation assembly, a vacuum tube, a drive component, an equipment box, a lifting mechanism, and a wear warning structure. The upper end of the counterweight compensation assembly extends upward through the rotating shaft, and the wear warning structure is connected to the protruding end of the counterweight compensation assembly to achieve visual monitoring of the wear degree of the mixing paddle. This invention uses a radially sliding mixing paddle assembly, in conjunction with the internal counterweight compensation assembly, to form a linkage transmission, achieving automatic wall-adhesion compensation after the scraper wears, ensuring that the scraper end is always in close contact with the inner wall of the cylinder, eliminating scraper failure and material accumulation and residue problems, thus ensuring the uniformity of material mixing and avoiding material waste; at the same time, the wear warning structure enables visual monitoring of the wear state, allowing for timely replacement of the scraper, greatly improving the convenience of equipment operation and maintenance.

The invention discloses a carbon-free composite spinel material for refining special steel of an aircraft carrier and a preparation method of the carbon-free composite spinel material. The carbon-free composite spinel material comprises the following components in percentage by mass: 20-30% of activated alumina micro powder, 5-12% of yttria-stabilized zirconia micro powder, 1-3% of a rare earth oxide composite additive and the balance of fused magnesite particles, wherein the rare earth oxide is formed by compounding Y2O3 and La2O3 according to the mass ratio of (2-3): 1; the preparation method comprises the steps of raw material high-energy ball milling pretreatment, vacuum mulling and aging treatment, isostatic compaction and gradient drying, and segmented controllable atmosphere sintering. Through the synergistic effect of zirconium oxide phase change toughening and rare earth oxide grain boundary purification, the high-temperature strength, thermal shock resistance and erosion resistance of the material are remarkably improved at the same time under the completely carbon-free condition, and the method is particularly suitable for the vacuum refining process of aircraft carrier special steel; the technical problems that a traditional carbon-containing material pollutes molten steel and a traditional carbon-free material is insufficient in performance are solved.

This invention discloses a highly active ceramic-collagen composite bone scaffold and its preparation method, belonging to the field of bone repair material preparation technology. Quaternized ammonium inorganic material inclusions, photosensitive resin, and dispersant are mixed and ball-milled to obtain a mixed slurry. The mixed slurry is then printed to obtain a bioceramic porous scaffold green body. The bioceramic porous scaffold green body is sintered to obtain a bioceramic porous scaffold. The bioceramic porous scaffold is then vacuum-mixed with collagen fiber slurry, followed by post-treatment to obtain a ceramic-collagen composite scaffold. The ceramic-collagen composite scaffold is then impregnated with rhBMP-2 solution to obtain the highly active ceramic-collagen composite bone scaffold. The preparation method of this invention not only solves the mechanical properties of the prepared bone scaffold but also achieves good osteogenic effects.

The utility model discloses a vacuum mixing and defoaming device for an anhydride curing agent, which relates to the field of chemical equipment and comprises a first mixing tank body, a second mixing tank body is arranged at the bottom of the first mixing tank body, a vibration chassis is arranged at the inner bottom of the second mixing tank body, a containing tank is arranged above the vibration chassis, and the containing tank is arranged above the second mixing tank body. A limiting lantern ring matched with the containing tank is arranged in the first mixing tank body, and a second limiting plate is arranged at the top of the containing tank. By means of the limiting lantern ring, the first clamping plate and the second clamping plate are ingeniously matched, the limiting lantern ring is rapidly installed, then the containing tank is aligned and installed, meanwhile, the first connecting plate and the second connecting plate are combined, screws and rubber are used for sealing, the installation process is simple and convenient, and the problems that traditional equipment is complex in structure and inconvenient to operate are solved. And the use and maintenance cost is greatly reduced.

The present invention discloses a feeding anti-blocking system and a method for using a dual planetary vacuum mixer, which relates to the technical field of mixers and includes: an anti-blocking device arranged inside the vacuum mixer, and at least one feeding device located outside the vacuum mixer; the vacuum mixer is provided with at least one feeding pipe, the feeding pipe extending from the outside of the vacuum mixer to the inside of the vacuum mixer, the anti-blocking device being arranged inside the feeding pipe, and / or being arranged on the discharge port of the feeding pipe. The feeding device is used to convey materials and provide conveying pressure for the materials, so that solid materials can enter the vacuum mixer in the form of a jet, thereby increasing the diffusion area of ​​the solid materials in the vacuum mixer. At the same time, because the feeding device can provide conveying pressure for the materials, the feeding device can also be used to feed liquid materials, allowing the liquid materials to enter the vacuum mixer in the form of a jet, atomization, etc., so as to improve the mixing efficiency.

The invention belongs to the technical field of pile foundation mud cake modification, and particularly relates to a pile foundation mud cake modification test method based on transparent clay, which comprises the following steps: step 1, preparation stage: preparing a uniform bubble-free transparent clay sample, consolidating the sample, and preparing reference mud and modified mud with stable performance; and 2, pile sinking and mud cake forming stage: drilling a hole in the center of the solidified transparent clay sample, respectively injecting the reference mud and the modified mud into the hole, standing to form the mud cake, and implanting the model pile without disturbance. According to the pile foundation mud cake modification test method based on the transparent clay, through five-stage systematic design of preparation, pile sinking, curing, loading and analysis, multiple core values are achieved. In the preparation stage, a homogeneous transparent clay sample and stable slurry system is constructed through quantitative calculation, vacuum mixing and graded consolidation, and the problems that traditional test parameters are fuzzy and samples are not uniform are solved.

This utility model provides a vacuum mixing device for moisturizing emulsions, including a reaction vessel tank and a detachable top cover. The reaction vessel tank and the top cover form a sealed cavity. A first drive motor is installed on the top of the top cover, and a first rotating shaft is installed at the output end of the first drive motor. The first rotating shaft passes through the top cover and moves within the cavity. Multiple connecting arms are evenly arranged axially at the front end of the first rotating shaft, and scrapers that fit against the inner wall of the reaction vessel tank are fixed on the connecting arms. A second drive motor is installed at the bottom of the reaction vessel tank, and a second rotating shaft is installed at the output end of the second drive motor. The second rotating shaft passes through the reaction vessel tank and moves within the cavity. Multiple stirring rods are evenly distributed axially on the second rotating shaft, and curved guide plates are installed on the multiple stirring rods. A stirring plate is fixedly installed at the front end of the stirring rods. The first rotating shaft and scrapers rotate counterclockwise, and the second rotating shaft and stirring rods rotate clockwise, so as to achieve efficient mixing of materials within the cavity.

This invention provides a high-precision cremated remains keepsake based on die casting and its preparation method, belonging to the field of funeral keepsake technology. Addressing the problems of low precision, poor efficiency, high cost, and difficulty in large-scale production in existing cremated remains keepsake molding processes, this invention designs a suitable die casting process based on the characteristics of calcium phosphate (CaP), the main component of cremated remains. This process includes raw material pretreatment, vacuum mixing, mold pretreatment and die casting, demolding and curing, and fine processing steps: the cremated remains are dried and secondarily ground to 150–200 mesh without any sieving; they are then vacuum mixed with a bio-based or inorganic binder in a specific ratio; die-cast under preset temperature and pressure parameters; and finely processed after targeted curing and maintenance. The keepsake prepared by this invention has a density ≥92%, excellent strength, exquisite appearance, and can achieve complex shapes. Furthermore, the process is stable and controllable, with no harmful residues, good biocompatibility, and is suitable for large-scale industrial production.

The invention relates to the technical field of welding materials, and particularly discloses a halogen-free soldering tin material and a preparation method thereof. The soldering tin material comprises solder alloy powder and halogen-free scaling powder; the solder alloy powder comprises Bi, In, Ag, Cu, rare earth elements Y and Sn; the halogen-free scaling powder comprises hydrogenated rosin, a thixotropic agent, a corrosion inhibitor, a catalytic adsorbent, a composite organic acid active agent and the balance solvent. The preparation method comprises the steps of surface grafting synthesis of the catalytic adsorbent, scaling powder preparation, alloy powder atomization and vacuum mixing. According to the scheme, through a new mechanism of adsorption-catalysis-slow release, on the premise that no halogen is completely generated, excellent wettability, extremely low welding spot voidage, high-strength interface connection and excellent thermal fatigue resistance and corrosion resistance are synchronously achieved, welding spots are full and bright after welding, no tin beads exist, and the welding quality is improved. The balance problem of halogen-free welding among activity, reliability and manufacturability is comprehensively solved.

The invention relates to the technical field of mixing equipment, in particular to a material vacuum mixing mechanism and freeze-drying production equipment comprising the same, the material vacuum mixing mechanism comprises a base and further comprises a differential mixing assembly, and the differential mixing assembly comprises a plurality of first pressure plates arranged in a mixing tank; the material pressing mechanism is used for driving the second material pressing plate to periodically move towards the direction of the second material pressing plate when rotating; the material turning mechanism comprises a plurality of second material turning plates arranged in the mixing tank, the second material turning plates move between the first material pressing plate and the second material pressing plate, and the first material turning plate turns to the upper surface of the second material pressing plate from the horizontal state. The differential mixing assembly is arranged in the mixing tank, the mixing efficiency is improved through the first pressing plate and the second pressing plate which are opposite in rotating direction, meanwhile, the second pressing plate can be driven to float up and down in the mixing process, the mixing range can be widened, and the grinding effect is achieved; and surrounding materials are pushed between the two material pressing plates and are matched with each other, so that the mixing efficiency is further improved.

The utility model relates to the technical field of food processing equipment, in particular to a beef vacuum mixing device which comprises a rack, a containing assembly, a stirring assembly, a vacuum assembly and a fixing assembly. The containing assembly is arranged on the rack, the containing assembly comprises a stirring tank body, an upper cover and a flexible sealing ring, the stirring tank body is provided with a containing tank, the stirring tank body is hinged to the upper cover in a covering mode, and the flexible sealing ring is arranged between the stirring tank body and the upper cover; a main body of the stirring assembly is arranged in the containing groove, and the stirring assembly is used for mixing materials; the fixing assembly is arranged on the upper cover and the stirring tank body and forces the upper cover and the stirring tank body to extrude the flexible sealing ring; the vacuum assembly is fixedly arranged on the rack. In the application, the relative positions of the upper cover and the stirring tank body are fixed by utilizing the fixing assembly, so that the upper cover and the stirring tank body extrude the flexible sealing ring to ensure the sealing performance of the accommodating assembly; therefore, the beef is mixed in a vacuum environment, so that the texture and flavor of the beef product are improved.