52results 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.

Production MDI-base polyurethane micro-porous elastomer is prepared by performed polymer, reacting excess polyisocyanate with polyhydroxy compound at 120-140degree to from NCO-base performed polymer, pouring, mixing performed polymer with chain extender proportionally, injecting reactive liquid into mould at 80-95degree, pre-curing, de-molding, and after-curing for de-molded product at 110degree for 13-16hrs. It can be used for buffering and shock-absorbing components.

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 high-pore controllable three-dimensional through hole foam molybdenum and a preparation method thereof. The molybdenum pore is in the shape of a three-dimensional sphere, and the pore is formed by mutually communicating generating holes with interstitial holes. The pore rate of the molybdenum structure is higher and is controllable, the pore is in the shape of a regular sphere, and the pore has isotropic mechanical characteristic. The preparation method is based on a traditional powder metallurgy method, a foaming method is combined, a novel layer spread method for material loading is adopted, and then, the foam molybdenum is obtained through pressing, dissolving and sintering. The preparation method provided by the invention is simple, the cost is low, the production cycle is short, pores are distributed uniformly, and the foam molybdenum has favorable mechanical and energy absorption properties.

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 discloses a casting method and a casting device for a braking disc body and the braking disc body made by the method and the device. The casting process and the casting device for the braking disc body are simulated and analyzed by computer simulation software, the positions of a casting system and a feeding system are determined, a pouring cup is replaced by a feeder head, molten metal is directly poured through the feeder head, the center of the feeder head is positioned at the geometric center of a casting part, the molten metal is introduced from the top part of a cavity for top casting, and the molten metal directly enters the cavity through a rectifying and filtering device from the feeder head. The casting method of the braking disc body can achieve progressive solidification and complete feeding of the casting part, so as to effectively prevent the casting part from having defects such as shrinkage cavity, shrinkage porosity, sand hole, pore, slag eye, crack and the like during casting, ensure the isotropy of the performances of the casting part, and ensure batch production of the braking disc body; besides, the metal utilization rate is improved by 30-60%, the production cost is reduced by 30-50% and the working efficiency is improved by 40-60%.

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 discloses a polytetrafluoroethylene composite microwave dielectric material. calculated based on the total mass of the polytetrafluoroethylene composite microwave dielectric material is composed of the following components in percentage content by mass: 30-60 wt% of polytetrafluoroethylene, 35-60 wt% of microwave dielectric ceramic powder filler, and 5-15 wt% of glass fiber powder. According to the polytetrafluoroethylene composite microwave dielectric material and the preparation method thereof, isostatic pressing compaction is adopted, the isotropy of properties of the material can be ensured, and the composite microwave dielectric material having low thermal expansion coefficients in the X-axis, Y-axis and Z-axis directions is prepared.

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 14.5mm-thickness dedicated automobile spoke steel uniform in property and a manufacturing method and application of the spoke steel, and belongs to the field of micro-alloying steel manufacturing. In the manufacturing method, a rough rolling and precision rolling two-stage rolling mode is adopted to carry out rolling on a slab, the proportion of the transverse rolling pass to the longitudinal rolling pass meets 1:1.5N in the rough rolling stage, N is a positive integer and is larger than or equal to 2, in the cooling process, the rule that the length of a steel plate is matched with the conveying speed of a conveying roller way and the cooling water amount is adopted for carrying out control, the steel plate is cooled and then is subject to further heat treatment in a normalizing manner, and the rotary pressing manner is adopted in spoke manufacturing. The tensile strength of the steel plate manufactured through the method can reach more than 510 MPa, the difference of the longitudinal and transverse mechanical properties can be controlled within 50 MPa, the fatigue life of a spoke manufactured through the steel plate can reach more than 2400000 times, and through inspection of an automobile wheel enterprise, the use requirement can be met.

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 belongs to the field of 3D printing building material preparation, and particularly relates to a printing parameter defining method for isotropic foam concrete. Comprising the following steps: (1) preparing foam concrete meeting 3D printing; (2) determining a value range of a printing interval ti according to the following formula; (3) curing the printing sample, and preparing a water absorption test sample; (4) performing perspective imaging on the article in the dry state to obtain a dry sample image, performing a water absorption test on the corresponding dry sample, and performing perspective imaging on the sample after water absorption to obtain a water absorption sample image; and (5) subtracting the dry sample image and the water absorption sample image before and after water absorption to obtain a water content curve in the sample, and obtaining an optimal printing interval for preparing the isotropic foam concrete according to the water content curve. The problems that the lower layer structure of the 3D printing foam concrete is prone to collapse and the microstructure is inconsistent in all directions are solved, and the preparation technology of the 3D printing foam concrete is optimized.

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 discloses a semitrailer rear turning angle control mechanism capable of performing accurate guidance. The mechanism comprises a connecting rod fixing device and a driving device. The driving device comprises an oil cylinder and a supporting base. The supporting base is hinged to a frame, a hinge point is located at the rotation center of the supporting base, and the supporting base can rotate around the hinge point. One end of the oil cylinder is hinged to the frame, and the other end of the oil cylinder is hinged to the supporting base and used for driving the supporting base to rotate. Four axles hinged to the frame are installed on the frame, two axles form one set and are coaxially arranged, and the front set of axles and the rear set of axles are parallelly arranged. The connecting rod fixing device comprises four connecting rods hinged to the supporting base, one end of each of the four connecting rods is hinged to the supporting base, and the other end of each of the four connecting rods is hinged to the corresponding axle. The semitrailer rear turning angle control mechanism hydraulically controls rear wheel steering, the steering precision is greatly improved, the steering equidirectional property of wheels is ensured, and the potential safety hazards of a semitrailer in transportation are decreased.

The invention discloses a portable auxiliary calibration device for fishery acoustic equipment and a calibration method thereof. For fixing the acoustic probe, one end of each elastic rope is connected to equally spaced parts around the bottom of the frustum-shaped support, and the other end is converged to connect the calibration ball, and the calibration ball is fixed at the center of the bottom of the frustum-shaped support; each fishing line One end of one end is also converging to connect the calibration balls, and the other ends are respectively extended to the top of the fixing frame along the equally spaced distribution parts on the truncated cone-shaped bracket; the calibration device uses a bracket with a certain weight to fix the acoustic probe and the calibration balls, which can reduce the water flow. The impact on the equipment; the calibration ball is fixed on the bracket with an elastic rope, and the calibration ball can be automatically reset under the action of the elastic force.

A method for manufacturing modified sepiolite fiber reinforced rubber asphalt, the specific steps include: step 1) completely immerse the sepiolite fiber in a solution containing cyclodextrin and sodium hydroxide at 50-60°C for 10-15 minutes, and After drying, the pretreated sepiolite fiber is obtained. The content of sodium hydroxide in the solution is 5-10wt%, and the content of cyclodextrin is 2-4wt%. The capacity is not good, it is easy to form agglomerates in the premixing process, and the dispersion effect is not good. The present invention pretreats the sepiolite fiber + activates the surface to treat the surface, and strengthens the phase of the reaction system between the sepiolite fiber and the asphalt material. Capacitive, can ensure its uniform dispersion in the reaction system, so as to ensure the isotropy of asphalt pavement.

The utility model belongs to the field of gate valve machining, and particularly relates to a gate valve body machining jig. A machining clamp for a valve body of a single-side slope gate valve comprises a wedge-shaped base plate, at least two movable pressing plates are installed on the base plate at intervals, a positioning support is further installed on the base plate, the two movable pressing plates and the positioning support form a triangle, the positioning support is an L-shaped support, one end of the positioning support is installed on the base plate, and a positioning rod is arranged at the end of the suspended end of the positioning support. Compared with a traditional gate valve wedge-shaped sealing face machining device, the gate valve wedge-shaped sealing face machining device is simple in structure and convenient to operate. More importantly, the method is suitable for the gate valve with a straight sealing surface and an inclined surface, the direction positioning is accurate and uniform, the isotropy of the inclined surface of the sealing surface of the gate valve is ensured, the newly developed single-side inclined surface gate valve is realized, the product quality is ensured, the unified standard of the valve body and the valve plate is ensured, and all gate valve product parts have universality and interchangeability; and a terminal user can replace parts at any time during maintenance.

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 discloses an optical device based on a transformation material bending beam and an implementation method, and belongs to the technical field of transformation materials and optical signal processing. The optical device includes an input surface, a two-dimensional straight-sided Eaton lens based on a transformation material curved beam, and an output surface. A traditional Eaton lens is converted into a straight-sided lens through an optical conversion method, the conversion relation between the straight-sided lens and the traditional Eaton lens is obtained through conformal conversion, and then medium parameters are obtained through a material conversion method. The incident angle and the emergent angle of the light on the transformed two-dimensional straight-edge Eaton lens are kept unchanged, the light, which has the same angle with the normal of each point of the input surface, in the traditional Eaton lens is equivalent to a beam of parallel light after transformation, and the incident angle and the emergent angle of the light are equal in size, so that the propagation path of a wave beam is changed along with the difference of the incident angle; a beam path can be guided to reach various very wide bending angles, and variable-angle steering is realized in single equipment; isotropy is ensured, and engineering preparation is facilitated.

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.

The invention discloses a high-viscosity modified asphalt and a preparation method thereof, belonging to the technical field of road engineering materials. The high-viscosity modified asphalt raw materials include: 500 parts of matrix asphalt, 300-400 parts of additives and 10-20 parts of composite reinforcing fibers; The composite reinforcing fiber is prepared by compounding basalt fiber and polyester fiber and then wrapping the asphalt matrix film; when preparing high-viscosity modified asphalt, the present invention can not only greatly improve the cohesiveness of the asphalt pavement by adding composite reinforcing fiber , high temperature stability, fatigue durability, and has the performance of low temperature crack resistance and reflection crack prevention. Effectively improve tensile, shear, compressive and impact strength, improve thermal stability and low temperature resistance.

The invention relates to a three-dimensional force sensor and a decoupling method, the sensor comprises an elastic body, the elastic body comprises a first area and a second area along the axial direction, the first area is a beam plate with two ends fixedly connected with the elastic body, and the second area is a hollow pipe with two ends fixedly connected with the elastic body; the axis of the first optical fiber is collinear with the axis of the elastic body, the two ends of the first optical fiber are fixed at the two ends of the elastic body, the first optical fiber at least comprises a first section penetrating through the hollow pipe and a second section fixed on the beam plate, and a first fiber bragg grating and a second fiber bragg grating are engraved on the first section and the second section respectively; at least parts of the second optical fibers are symmetrically arranged on the two sides of the second section of the first optical fiber, the plane where the parts of the second optical fibers are located is parallel to the surface of the beam plate, the two ends of the second optical fibers are fixed to the elastic body, and a third fiber bragg grating and a fourth fiber bragg grating are carved on the second optical fibers respectively. Through the arrangement, the assembly error is reduced, the robustness is high, and miniaturization is easy.

The invention discloses a high-pore controllable three-dimensional through hole foam molybdenum and a preparation method thereof. The molybdenum pore is in the shape of a three-dimensional sphere, and the pore is formed by mutually communicating generating holes with interstitial holes. The pore rate of the molybdenum structure is higher and is controllable, the pore is in the shape of a regular sphere, and the pore has isotropic mechanical characteristic. The preparation method is based on a traditional powder metallurgy method, a foaming method is combined, a novel layer spread method for material loading is adopted, and then, the foam molybdenum is obtained through pressing, dissolving and sintering. The preparation method provided by the invention is simple, the cost is low, the production cycle is short, pores are distributed uniformly, and the foam molybdenum has favorable mechanical and energy absorption properties.