47results about How to "Guaranteed isotropy" patented technology

The invention discloses a method and device for casting a brake disc body, and the brake disc body manufactured through the method and device. A casting system and a feeding system are perpendicularly stacked together in a cluster mode, the casting system on the upper layer is replaced with a feeder head on the lower layer, the center of the feeder head is arranged at any position from the inner side wall of a casting to the geometric center of the casting, a mode that metal liquid is introduced in a bottom returning mode is adopted to perform cluster casting, the metal liquid enters a cavity in the upper layer from the bottom of the lower layer, and after the cavity in the upper layer is filled with the metal liquid, the metal liquid enters a cavity in the upper layer from the feeder head on the lower layer. According to the casting method, sequential solidification and complete feeding of the casting can be achieved, defects of shrinkage holes, shrinkage porosity, sand holes, air holes, slag holes, cracks and the like are effectively prevented from appearing in the casting process of the casting, isotropy of performance of the casting is ensured, meanwhile, the method is suitable for large-scale production of the high-quality brake disc body under the large-ladle casting, the use rate of metal is improved by 30 percent to 60 percent, the production cost is reduced by 30 percent to 60 percent, and the working efficiency is improved by 40 percent to 60 percent.

The invention discloses bridge coarse aggregate active powder concrete and a preparation method thereof. The coarse aggregate active powder concrete comprises, by weight, 100 parts of cement, 20-60 parts of blending materials, 2-10 parts of interface modifying agents, 60-120 parts of fine aggregates, 40-120 parts of coarse aggregates, 10-60 parts of fibers and 15-30 parts of water. Under conventional curing processes such as natural conditions, the coarse aggregate active powder concrete has super-high compressive strength, bending tensile strength and tensile strength and bonding strength andlow contraction performance and further has high elasticity modulus, anti-fatigue performance and durable performance and excellent construction performance, dead weight and shrinkage and creep influence of a bridge can be reduced, and the span, the structural stiffness and the bearing capacity of the bridge can be remarkably improved, and the service life of the bridge is prolonged.

The present invention relates to a silicon carbide base composite material reflector with honeycomb sandwich structure. It is characterized by that after the upper cover plate, sandwich layer with honeycomb structure and lower cover plate are bonded, then they are undergone the processes of siliconing and sintering treatment so as to obtain the invented reflector whole body with the characteristics of light weight, high rigidity and good workability, etc. Besides, said invention also provides its preparation method and concrete steps.

The invention discloses a fabrication method of a compound mica tape. The method is characterized in that 2%-15% reinforced fiber is directly added in the conventional fabrication process of mica paper, and the reinforced fiber is directly doped with the mica paper, so that the fabricated mica tape can be used and is not required to be compounded with a reinforced layer. The method is easy and simple to operate and requires no compound procedure, an insulation effect of the traditional mica tape can be achieved by directly doping the reinforced fiber with the mica paper, the isotropy of electric insulating properties after once molding of the reinforced fiber and the mica paper is ensured, and the insulation thickness of the mica tape is reduced.

The invention discloses high-adhesion modified asphalt and a preparation method thereof, and belongs to the technical field of road engineering materials. The raw materials of the high-adhesion modified asphalt comprises 500 parts of base asphalt, 300-400 parts of an additive and 10-20 parts of composite reinforcing fibers, and the composite reinforcing fibers are prepared by compounding basalt fibers and polyester fibers and then being coated with base asphalt thin films. When preparing the high-adhesion modified asphalt, the composite reinforcing fibers are added, so that the adhesion, high-temperature stability, fatigue durability of asphalt pavements are greatly improved, and the asphalt has the properties of low-temperature crack prevention and reflection crack prevention. The tensile, shear, compressive and impact strength are effectively improved, and the thermal stability and low temperature resistance of the asphalt are improved.

The invention discloses a gray enhanced chromatography PIV (Particle Image Velocimetry) reconstruction method. The method comprises the following steps: before MART (Multiplication Algebraic Reconstruction Technology) iteration, counting a particle drawing ratio in a space gray field; according to the particle drawing ratio, determining an inverted diffusion intensity factor, and updating the space gray field according to the inverted diffusion intensity factor and an inverted diffusion equation; calculating a gray inhibiting factor according to a particle concentration obtained by counting, then reallocating the particle gray to the updated space gray field according to the gray inhibiting factor, and then performing the MART iteration for the next time. The invention further discloses a device and equipment for realizing the method.

The invention provides a method for preparing a two-dimensional layered transition metal nanosheet gel. The method comprises the following steps: providing two-dimensional layered transition metal nanosheets with specific functional groups as a solute, and dissolving the two-dimensional layered transition metal nanosheets in a solvent to form a nano dispersion; and providing a cross-linking agentsolution containing a metal ion crosslinking agent containing positive divalent or positive trivalent metal ions, mixing the cross-linking agent solution with the nano dispersion, so as to form the two-dimensional layered transition metal nanosheet gel after mixing.

The invention relates to an electrodynamic induction loudspeaker. Technical characteristics of the electrodynamic induction loudspeaker are as follows: an induction voice coil is mounted in a magnetic gap formed between magnetic-conductance clamping plates, the induction voice coil is a multi-turn coil which is wound around a voice coil bobbin and is connected end to end to form a closed loop, the voice coil bobbin and a voice diaphragm are adhered with an inner edge of a centering disk, the outer edge of the centering disk is mounted at the upper end of a magnetic-conductance plate, an exciting coil is wound around a center magnetic-conductance post, a signal feeder line is connected with the exciting coil through a hole of a lower magnetic-conductance plate, and a magnetic steel, the lower magnetic-conductance plate and an upper magnetic-conductance clamping plate are magnetizers with high magnetic conductivity and high resistivity. The electrodynamic induction loudspeaker provided by the invention has a reasonable design, implements a high-linearity, high-sensitivity and low-misadjustment voice playing function, can remarkably reduce a distortion degree when applied to a mini speaker, such as a mobile phone speaker, an earphone speaker and the like, can implement high fidelity when applied to a middle-sized speaker, and can solve a heat dissipation problem when applied to a high-power loudspeaker in order to improve power capacity.

The invention provides a two-dimensional carbon-metal configuration composite material and a preparation method and an application thereof. The preparation method comprises the steps that a metal foil is subjected to annealing reduction, and the annealed metal foil is obtained; the annealed metal foil and a carbon material are laminated and rolled into a single-core coaxial cylinder blank, and the carbon material is selected from one or more of graphite paper, crystalline flake graphite, a graphene nanosheet and a graphene film; hot isostatic pressing sintering is carried out on the single-core coaxial cylinder blank under the protection of argon to obtain a carbon-metal composite material blank; the sheath is removed from the carbon-metal composite material blank, and hot extrusion is carried out to obtain the composite material with high thermal conductivity and low thermal expansion coefficient. By means of the laminated cylindrical coaxial configuration design, the isotropy of the two-dimensional carbon-metal composite material in the transverse section can be guaranteed, high heat conductivity can be obtained in the longitudinal direction, and therefore the problem that the heat conductivity and thermal expansion of a thermal management material are not matched is solved while the heat conduction performance of the material is improved.

The invention relates to a shearing fork lifting assembly and a shearing fork lifting system, and belongs to the field of lifting platforms. The shearing fork lifting assembly comprises three sets ofshearing fork structures, and each set of shearing fork structure comprises two shearing fork ribs arranged in a crossed manner, wherein the two shearing fork ribs are rotatably connected at the intersection position; and the three sets of shearing fork structures define a circle, the upper ends of the shearing fork ribs of every two adjacent shearing fork structures are rotatably connected to form three first connecting points, the lower ends of the shearing fork ribs of every two adjacent shearing fork structures are rotationally connected to form three second connection points, the three planes where the three sets of shearing fork structures are located form a triangular prism structure, the first connection points are used for being connected with a support platform assembly, and thesecond connection points are used for being connected with a lifting base. The shearing fork lifting assembly and the shearing fork lifting system guarantee stability of the support platform, are suitable for lifting and handling of large heavy-duty cargoes, and are suitable for high-precision controllable lifting of light cargoes.

The invention discloses a shield advancing and hinging system, comprising a plurality of double-acting hydraulic cylinders, a plurality of single-acting hydraulic cylinders. The double-acting hydraulic cylinders and the single-acting hydraulic cylinders are evenly distributed in a middle shield and are mutually parallel, wherein a carrier plate is fixed to a push rod head at each of same ends of the double-acting hydraulic cylinders and single-acting hydraulic cylinders are. The carrier plates may form a complete work plane. Push rods at the other ends of the double-acting hydraulic cylinders are hinged to a rear shield. Cylinder blocks of the single-acting hydraulic cylinders are fixed to the middle shield. By using the system, adjusting efficiency of a shield tunneling machine is greatly improved.

The invention provides a preparation method of a high-performance ultra-fine structure carbon graphite product, which comprises the following steps: compounding and carbonizing graphite micropowder and a first adhesive in a granulation manner to obtain a composite particle material; subjecting the composite particle material, a second adhesive, additive and graphitization accelerator to liquid phase mixing, then drying and molding, performing 3-8 times repeated dipping and roasting, graphitization treatment to obtain high-performance ultra-fine structure carbon graphite products. Compared withthe prior art, the invention uses graphite micropowder as a raw material, thus saving energy and protecting the environment; isotropic composite particle materials are obtained after granulation, which greatly reduces the anisotropy of subsequent ultra-fine structure carbon graphite products; third, problems such as internal cracking caused by elastic deformation caused by temperature change areavoided, the density and strength of ultra-fine structure carbon graphite products are improved, and the comprehensive performance is good.

The invention relates to a ship formation precise positioning system and method based on a TDOA principle. The system comprises a first time frequency source on a positioned chip; a single-channel receiver and a receiving antenna which are connected; a first wireless network communicator and a first transceiving antenna which are connected; a second time frequency source on a central station chip;a multi-channel receiver and the receiving antennas which are connected; a second wireless network communicator and a second transceiving antenna which are connected; and a central control system. The first transceiving antenna is coupled with the receiving antenna of each receiving channel of the multi-channel receiver, the receiving antenna of the single-channel receiver and the second transceiving antenna. The system is a new positioning system based on the TDOA principle in a collaboration mode. Positioning precision is greatly improved. The precision deficiency resulting from the fact that a base line is too short is compensated. The technical problem of high precision mutual positioning among ships in maritime chip formation is solved successfully.

The invention relates to a homodromous rotation output mechanical structure, in particular to a telescopic rod type homodromous rotation output mechanism and a lighting device, and aims at solving thetechnical problems that an existing homodromous rotation output mechanism is time-consuming, labor-consuming, low in transmission efficiency and inconvenient to use. According to the technical scheme, the telescopic rod type homodromous rotation output mechanism is provided with an inner barrel, an outer barrel, a driving assembly and a reversing assembly, the inner barrel and the outer barrel form a telescopic rod structure, the driving assembly provides power for rotation, the reversing assembly is used for guaranteeing homodromous rotation, and homodromous rotation of the output end can beachieved through relative stretching and retracting of the inner barrel and the outer barrel in the using process, so that transmission efficiency is high, time and labor are saved, operation is easy, and use is convenient. The lighting device is provided with the telescopic rod type homodromous rotation output mechanism and a lighting assembly, the lighting assembly comprises an installation rod, a permanent magnet is installed on the installation rod, the telescopic rod type homodromous rotation output mechanism provides one-way rotation for the permanent magnet, and therefore, power generation lighting is achieved.

The invention provides an extrusion system device for machining reinforced materials. By means of the extrusion system device, a machined product is good in isotonicity, the liquidity of the product in the die pressing process is good, and the load of a threaded rod is reduced. The extruder system device for producing the reinforced materials comprises a twin-screw extruder; the twin-screw extruder comprises a hopper-shaped feeding port; continuous filaments are from a continuous filament supporting rack; part of the continuous filaments enter a fixed-length cutting machine for being subjected to fixed-length cutting, the other part of the continuous filaments are heated through heating equipment, and then the heated continuous filaments and the fixed-length cut filaments enter the twin-screw extruder through the hopper-shaped feeding port to be mixed with and dispersed with thermoplastics polymers. The continuous filaments entering the twin-screw extruder are twisted to broken and dispersed through the threaded rod inside the twin-screw extruder. The continuous filaments twine with one another and are overturned and bent inside the twin-screw extruder, the isotropy of the product is guaranteed, the flatness is good, the liquidity of the product in the die pressing process is increased through the fixed-length cut filaments, the filaments are distributed more uniformly in the product, and the bearing capacity of the produced product is higher.