23results about How to "Improve density uniformity" patented technology

This invention relates to the field of thermal insulation materials, specifically to an inorganic silicon crystal fire-resistant thermal insulation material for fireproof air ducts and its preparation method. The material comprises inorganic silicon crystal powder, hollow microspheres, composite binders, reinforcing fibers, surface modifiers, nano-antibacterial agents, crack-resistant agents, flame-retardant synergists, and intumescent flame-retardant microcapsules. The inorganic silicon crystal powder is activated by calcination, the microspheres are pretreated with coupling agents and coated with silica sol, the binder is a compound type, the fibers are grafted, the antibacterial agent is loaded onto a carrier, and the flame-retardant microcapsules have a specific core and shell. All components work synergistically to ensure performance. This invention improves the material's fire resistance, thermal insulation, and mechanical properties, integrates antibacterial and flame-retardant functions, optimizes the process to ensure stable performance, reduces fire risk, and meets the high-performance and high-stability requirements of high-end building fireproof air ducts.

The utility model relates to the technical field of powder forming equipment, and discloses a transverse powder forming machine which comprises a machine frame used for installing and supporting mechanical parts. The upper punching device is installed on the rack and used for pressing and forming powder. The workbench is arranged between the upper punching device and the lower punching device; the transverse pressing devices are installed on the workbench, the transverse pressing devices are oppositely arranged, and each transverse pressing device comprises a linear driving piece and a forming block; the forming blocks are driven by the linear driving piece to be spliced to form a cavity used for containing powder. The control system is used for receiving signals and outputting the signals. According to the utility model, multidirectional cooperative pressing is adopted, high-precision forming control is realized, and the adaptability is strong.

The application discloses a kind of solid waste material compression molding equipment before test, it is related to solid waste compression technology field, including main body, the front of main body is sequentially provided with upper die punch, female die and lower die punch from top to bottom, the upper die punch and lower die punch can be slidably matched in the cavity of female die, feeding unit is arranged between the main body and the upper die punch, and the discharge end of the feeding unit is arranged in the upper die punch.The application makes the female die in the compression process in floating state, when the upper die punch is pressed down, the friction between the powder and the inner wall of female die can drive the female die to descend synchronously, the floating effect makes the lower die punch relatively enter the female die cavity deeper position and generate reverse pressure, significantly improve the density uniformity of briquetting in vertical direction.

The utility model discloses a kind of waste washing machine metal shell compression devices, the device includes base, the base is provided with compression box, compression box is a side or the square box of opposite pair of side open, multiple compression mechanism is set in compression box, multiple compression mechanism includes transverse compression component and longitudinal compression component, transverse compression component has symmetric distribution two groups, respectively set in the two sides of adjacent side of compression box opening side, longitudinal compression component is set in the upper portion of compression box, transverse compression component includes transverse extrusion plate and the transverse hydraulic cylinder of being set in the rear of transverse extrusion plate, longitudinal compression component includes downward extrusion longitudinal extrusion plate and the longitudinal hydraulic cylinder of being set in the above of longitudinal extrusion plate.The utility model is compressed to waste washing machine metal shell by transverse, longitudinal and rotation three directions simultaneously, compression efficiency is high, the density of compressed metal square is uniform, metal recovery rate is high, easy to operate, effect is remarkable.

The invention relates to the technical field of precious metal metallurgy, and discloses a high-density iridium ingot sedimentation type smelting process which comprises the following steps: preparing a water-cooled copper crucible with a zirconium oxide inner wall coating; iridium powder and calcium oxide powder are mixed and put into a crucible; performing induction heating in a vacuum environment until the raw materials are molten; protective gas is inflated, periodic variable-pressure oscillation operation is applied under the condition that the temperature of the melt is kept, and slag crust on the surface of the melt is destroyed through pressure fluctuation and deep gas is promoted to be exhausted; after oscillation is stopped, the melt is left to stand, and a slag system floats upwards and is separated; and establishing a bottom-to-top temperature gradient to control directional solidification of the melt. According to the invention, oxide hard shells are destroyed through a variable-pressure oscillation mechanism, and efficient degassing and impurity removal are realized by cooperating with calcium oxide slagging; the zirconia coating effectively prevents the crucible material from being polluted; the directional solidification and hot isostatic pressing process eliminates internal shrinkage cavities and looseness. According to the process, the impurity content in the iridium ingot is remarkably reduced, and the purity and compactness of the material are improved.

The utility model belongs to the technical field of building construction, and discloses a concrete fixing frame for building construction, which comprises a base, a bottom plate arranged above the base, a support frame rotationally connected to the upper side of the bottom plate, a first side plate and a second side plate rotationally connected to the outer side of the support frame, and an auxiliary slicking mechanism for slicking concrete, the auxiliary slicking mechanism comprises L-shaped fixing blocks arranged at the corners of the supporting frame, vertically-upward fixing stand columns are arranged at the corners of the top ends of the fixing blocks, guide sliding rods are arranged between the two fixing stand columns on the same side, and the number of the guide sliding rods is two. The auxiliary slicking mechanism is arranged at the top of the supporting frame, the push-pull handle is manually pushed and pulled, the push-pull handle drives the movable connecting plate to move along the guide sliding rod through the rotating shaft, the movable connecting plate drives the slicking plate to move, poured concrete can be primarily slicked, the workload of follow-up manual leveling is reduced, and the working efficiency is improved. And the quality of the concrete surface is improved.

This invention relates to a large-size, high-density, high-carbon, high-silicon hot-rolled round steel bar and its preparation method. The chemical composition of the hot-rolled round steel bar, by weight percentage, includes: C: 0.60%~0.70%, Si: 1.70%~1.95%, Mn: 0.80%~0.90%, P≤0.015%, S≤0.015%, Cr: 0.80%~0.90%, Ni: 0.20%~0.25%, Mo: 0.05%~0. 0.10%, Al: 0.015%~0.035%, N: 0.0045%~0.010%, with the remainder being Fe and unavoidable impurities; it can balance toughness and wear resistance, and under the high carbon, high silicon, and high chromium composition system, it can effectively improve the internal density of hot-rolled round steel with a maximum φ110mm specification, meet the stringent flaw detection requirements of equivalent "≤φ1.3", and is suitable for the high-strength and high-wear working conditions of coarse copper ore grinding balls.

The pre-pressing structure for the heavy hydraulic machine comprises a pre-pressing plate and a lower pressing plate, the two sides of the pre-pressing plate are both fixedly connected with limiting sleeves, lubricating sliding sleeve structures are installed in the limiting sleeves, the lower pressing plate is arranged above the pre-pressing plate, a mold groove is formed in the bottom end of the pre-pressing plate, and the lower pressing plate is connected with the mold groove. Pressing structures are hinged to the two sides of the bottom end of the lower pressing plate, each pressing structure comprises a push rod, a hinge seat, a sliding seat, a guide seat, a sliding rod and a disc spring, and the push rods are hinged to the two sides of the bottom end of the lower pressing plate. When the hydraulic machine drives the lower pressing plate to press downwards, the plurality of push rods at the bottom of the lower pressing plate disperse the downward pressure of the hydraulic machine to the plurality of push rods, so that the pressing force is dispersed, and the density is more uniform after a blank is formed; furthermore, when the structure is pre-pressed, the sliding seat is compressed towards the disc-shaped spring along the sliding rod due to pressure, at the moment, the disc-shaped spring is compressed to store elastic potential energy, and kinetic energy compensation is carried out on looseness of all parts.

The utility model relates to the technical field of pipe processing, provide a kind of pipe rapid forming device, including upper die and lower die, the upper die is shaped multiple shaping cavities after cooperation with the lower die, blanking tube is communicated with the injection slot on the lower die, the branch material groove of the injection slot is one-to-one corresponding with the shaping cavity, the lower die includes two rows of lower shaping groove, the injection slot and the branch material groove are respectively arranged in first plane and second plane mutually into preset angle, two rows of the lower shaping groove are arranged in the second plane.The utility model optimizes the structure of existing pipe processing die, improves the density uniformity of processing pipe, solves the problem that the surface of the processed pipe appears local depression because the flow of pipe raw material is blocked, improves the practicability of pipe forming device.

The utility model discloses a powder feeding mechanism and a magnetic core pressing device.The powder feeding mechanism comprises a material barrel, a rotating assembly and a material blocking assembly, a feeding port is formed in the top of the material barrel, a discharging port is formed in the bottom of the material barrel, the rotating assembly is arranged at the end, close to the discharging port, of the material barrel, and the material blocking assembly is arranged on the rotating assembly; the rotating assembly comprises a first rotating shaft and a second rotating shaft, the first rotating shaft and the second rotating shaft are horizontally arranged in the middle of the discharging port, and the material blocking assembly comprises a first material blocking plate and a second material blocking plate. The first material blocking plate and the second material blocking plate are connected with the first rotating shaft and the second rotating shaft respectively, and the first rotating shaft and the second rotating shaft drive the first material blocking plate and the second material blocking plate to move respectively. And the first material blocking plate and the second material blocking plate gradually open the discharging opening from the side wall of the charging barrel.

The invention belongs to the technical field of oil and gas fields, and discloses a spiral hydraulic jet efficient cement slurry distribution device and process, the bottom of a tank body is provided with a circulating pipeline, the circulating pipeline is inserted with a plurality of adjusting pipes, the adjusting pipes are in pipeline connection with nozzle connecting pipes, and the nozzle connecting pipes are provided with rotary hydraulic nozzles. Cement enters the tank body, a cement truck pumps a designed amount of clear water, the clear water sequentially enters the circulating pipeline, the adjusting pipe and the nozzle connecting pipe through the circulating inlet, high-speed spiral water jet is formed by rotating the hydraulic nozzle, and under the driving of spiral water flow, dry cement powder in the tank body spirally and irregularly flows along with the water flow to be fully and rapidly mixed. The device is easy to operate, high in cement slurry preparation efficiency and suitable for cement plug grouting slurry preparation operation with the ash amount within two cubic meters.

The invention relates to the technical field of silicon microrods, in particular to a preparation method of a novel synthetic silicon dioxide microrod. According to the technical scheme, the preparation method of the novel synthetic silicon dioxide microrod comprises the following steps: step 1, carrying out surface modification on a carbon nanotube template to enable the surface of the carbon nanotube template to be rich in oxygen-containing functional groups; 2, dispersing the surface-modified carbon nanotube template in a solution containing a surfactant and a silicon source, and carrying out a coating reaction of a silicon dioxide layer to form a core-shell structure; and step 3, removing the internal carbon nanotube template through calcination to obtain a silicon dioxide microrod, and carrying out enhanced ultrasonic acidizing treatment on the carbon nanotube at 80 DEG C for 2 hours by adopting a mixed acid solution of concentrated sulfuric acid and concentrated nitric acid in a specific volume ratio, so that the density and the distribution uniformity of carboxyl and hydroxyl functional groups on the surface of the carbon nanotube are remarkably improved, and the carbon nanotube is prepared. And the problems of coating layer defects and surface roughness caused by insufficient surface modification in the traditional method are effectively overcome.

The application relates to the technical field of inorganic non-metallic materials, and discloses a high-entropy oxide ceramic and a solid-phase reaction preparation method thereof; the high-entropy oxide ceramic is prepared by using multiple rare earth oxides, alkaline earth metal oxides and transition metal oxides with a purity of greater than or equal to 99.99% as raw materials, through the following steps of raw material pretreatment, chemical stoichiometric ratio batching, wet ball milling mixing, pre-sintering, secondary ball milling, composite forming, internal stress release, normal-pressure sintering densification and the like, and the high-entropy oxide ceramic bulk body with a single-phase solid solution structure, high density and stable performance is prepared. The process route of the application is simple and controllable, the raw material cost is low, no complex equipment is needed, the generation of multiple-component system heterogeneous phases can be effectively inhibited, the powder component uniformity is excellent, the prepared ceramic bulk body has high density, is suitable for large-scale industrial production, and can be widely applied to the fields of electronic information, aerospace, energy catalysis, heat protection and the like.

This invention discloses a method and rapid verification device for improving the one-time molding rate of large-size NdFeB products. The method includes: taking a selected amount of alloy powder, simulating the formal molding process in the rapid verification device, acquiring pressure-displacement data in real time during the molding process, and plotting a pressure-displacement curve; comparing the pressure-displacement curves of alloy powders with different powder state parameters when reaching the same compaction density, and selecting the powder state parameter with the most stable curve shape and the required molding pressure to reach that compaction density within a preset optimal range as the optimal powder state parameter; based on the optimal powder state parameter, producing large-size NdFeB green blanks in a formal production mold. This invention can efficiently screen out the optimal powder state parameters required for molding before inputting into the formal mold, significantly shortening the molding press debugging cycle, reducing trial and error costs, and significantly improving the one-time molding rate of large-size NdFeB products.

This invention relates to a method for forming large-size thin-plate ceramics, a forming mold, and the ceramic itself, belonging to the field of ceramic material forming technology. The method includes: filling, floating film floating, pressurization, depressurization-demolding-depressurization, and isostatic pressing steps. The depressurization-demolding-depressurization step includes: gradually depressurizing the upper pressure head while retaining a pre-set pressure; demolding, keeping the sample clamped between the upper and lower pressure heads, and lowering the floating mold until the sample is completely removed; and secondary depressurization: slowly reducing the pre-set pressure to zero, and retracting the upper pressure head to its initial position after leaving the sample. This invention effectively solves the problems of easy cracking, uneven density, difficult demolding, and easy deformation and damage during isostatic pressing of large-size thin-plate ceramics during the forming process, thereby enabling the preparation of high-quality, high-density, and uniform large-size thin-plate ceramic products.

The oscillating hot-pressing sintering process and equipment based on single and bidirectional switching includes single-direction oscillating hot-pressing, in which one end of the upper and lower pressure heads is locked, and the other end is used to implement single-direction oscillating hot-pressing on the sintered material; and bidirectional synchronous oscillating hot-pressing, in which the upper and lower pressure heads move synchronously, and implement synchronous bidirectional oscillating hot-pressing on the sintered material. The equipment includes a hydraulic station for providing a hydraulic power source, an upper pressure head and an upper pressure head cylinder, a lower pressure head and a lower pressure head cylinder, a reversing switching valve group for switching the working state of oscillating hot-pressing, and two control valve groups for controlling the pressure and flow of the pressure head cylinder. The input end of the reversing switching valve group is connected with the hydraulic station, the reversing switching valve group has two output ends, and the two output ends are connected with the upper pressure head cylinder and the lower pressure head cylinder through a control valve group, respectively. The oscillating hot-pressing sintering process and equipment based on single and bidirectional switching has the advantages of effectively improving the sintering quality, controllable cost, high efficiency and wide application range.

The utility model relates to the technical field of hydraulic machines, in particular to a bidirectional powder pressing machine capable of achieving floating demolding. Comprising a hydraulic machine, a floating demolding pressing mechanism is arranged in the hydraulic machine, the hydraulic machine is integrally fixed to a base support, the floating demolding pressing mechanism comprises a floating plate, a lower ejection cylinder, a floating cylinder and a core pulling cylinder, the lower end of the telescopic end of the floating cylinder is connected with a floating cylinder lengthening rod, and the lower end of the floating cylinder lengthening rod is connected with the floating plate; the floating plate is arranged in the hydraulic machine in an up-down sliding mode, the lower ejection cylinders are fixed to the two sides of the lower beam, the telescopic ends of the lower ejection cylinders are connected with lower punching ejection plates, the core-pulling cylinder is fixed to the middle of the lower beam, and the telescopic end of the core-pulling cylinder is connected with a core-pulling rod. According to the bidirectional powder pressing machine capable of achieving floating demolding, floating demolding can be conducted on a product after bidirectional pressing is conducted, the advantage that the density uniformity of the powder product obtained after bidirectional pressing is good is guaranteed, and the defect that a bidirectional powder pressing machine cannot achieve floating demolding is overcome.

This application relates to the field of composite material preparation technology, specifically to an efficient preparation process for continuous fiber reinforced silicon carbide ceramic matrix composites. The process includes: selecting silicon carbide powder and phenolic resin powder, stirring them in an aqueous solution of sodium carboxymethyl cellulose; obtaining a non-uniformity index based on changes in pixel reflectance in a hyperspectral image of the mixed slurry during stirring, and then obtaining the local distribution difference; obtaining particle agglomeration characterization values ​​at various times based on fluctuations in the local distribution difference; calculating the stirring effectiveness and controlling the stirring speed; impregnating and drying a continuous carbon fiber plain weave fabric in the resin matrix slurry to obtain a resin matrix composite preform; carbonizing to obtain a continuous fiber reinforced porous carbon matrix composite; and placing it in a vacuum sintering furnace for melt silicon infiltration treatment to obtain the continuous fiber reinforced silicon carbide ceramic matrix composite. This application improves the density and uniformity of the continuous fiber reinforced silicon carbide ceramic matrix composite.

The utility model relates to an air bag locking mechanism for an annular refrigerator door body foaming line mold frame, the foaming line mold frame comprises an upper mold frame and a lower mold frame, the inner side surfaces of the upper mold frame and the lower mold frame are hinged in an openable and closable manner, and a plurality of inverted U-shaped bolt buckles are longitudinally and upwards arranged on the outer side surface of the lower mold frame along the long side direction at equal intervals; clamping bolts which are of L-shaped structures and can be correspondingly connected with the bolt buckles in a buckled mode are longitudinally and downwards arranged on the outer side face of the upper die frame at equal intervals in the long edge direction of the upper die frame, and the tops of the clamping bolts are hinged to the outer side face of the upper die frame; a die lining plate matched with the lower die frame is placed on the top face of the lower die frame, and the die lining plate and the lower die frame are in elastic floating connection through four elastic pulling assemblies distributed in a rectangular shape. And an air bag is laid in a cavity formed between the mold lining plate and the lower mold frame. Through the cooperation mechanism of dynamic pressurization of the air bag and elastic pull uniform load reset, self-adaptive adjustment of the sealing pressure of the mold cavity and mold deformation compensation are achieved, the foaming quality is remarkably improved, meanwhile, the locking structure is simplified, and the production flexibility is enhanced.

This invention discloses an intelligent and rapid loading and unloading processing system for rubber sealing rings. Its structure includes a fixed frame, a support rod, a loading and unloading assembly, a nozzle, a control box, a motor, and a moving rail. The fixed frame is fixed to the support rod, the loading and unloading assembly is supported and fixed by the support rod, the moving rail is connected to the fixed frame, the support frame is supported between the moving rail and the control box, and the control box is connected to the nozzle for control. The motor controls the support frame to move along the moving rail, precisely limiting the amount of colloid extruded into the mold cavity. Through the uniform downward movement of the push plate driven by the colloid, combined with the limiting effect of the mold shell and the push plate, a closed and fixed-size molding space is formed. This prevents the colloid from flowing turbulently due to excessive pre-reserved space, effectively suppressing the generation and residue of air bubbles, while ensuring that the colloid is smoothly filled into the mold groove at a uniform speed, ensuring dense filling of the cavity and improving the density uniformity and dimensional accuracy of the formed rubber ring.

The application relates to the technical field of PET foaming processes, and particularly discloses a novel PET foaming process, which realizes real-time monitoring of product quality by measuring the density of a PET foam product in different zones, calculating the overall density score and comparing the overall density score with a preset threshold value; when detecting that the density is uneven, the system can automatically analyze the cause and judge whether the cause is that the temperature of a cooling system is unstable; if yes, the system automatically adjusts the opening degree of a cooling water valve, adjusts the temperature by changing the flow of the cooling water, and improves the consistency of the density of the product; in addition, the system also has the functions of continuously monitoring the temperature and repeatedly adjusting the temperature when necessary, so that the temperature is stabilized, and the product quality and production efficiency are improved; the application has the advantages that problems caused by temperature fluctuation can be automatically identified and solved, and the production automation level and the finished product rate are improved.

The utility model discloses a graphite electrode processing extrusion forming device, including support frame, extrusion frame, pretreatment frame and buffer feeding mechanism, support frame top is provided with buffer feeding mechanism, and extrusion frame sets up in the support frame, and pretreatment frame sets up between buffer feeding mechanism and extrusion frame, and raw material falls into pretreatment frame evenly through buffer feeding mechanism in turn, and the pretreatment mechanism in pretreatment frame carries out pre -extrusion to raw material, and the raw material after pre -extrusion falls into extrusion frame, the one side intercommunication of extrusion frame is provided with forming die, and the spiral feeding mechanism in extrusion frame will raw material extrude and form through forming die. The utility model has the advantages compared with prior art: through buffer feeding mechanism, realize the uniform, continuous conveying of raw material, avoid the forming defect that causes by uneven feeding, and the raw material is primarily compacted by pretreatment mechanism, and the density and flowability are improved, and good foundation is provided for subsequent extrusion forming.