35results about How to "Precise Density Control" patented technology

The invention relates to a light-weight, high temperature-resistance and heat-insulation ceramic fiber tile and a making method thereof. The heat insulation tile comprises ceramic fibers and boron oxide, wherein the ceramic fibers comprise quartz fibers, alumina fibers and yttrium oxide stabilized zirconia fibers. The making method of the light-weight, high temperature-resistance and heat-insulation ceramic fiber tile comprises the following steps: preparing a sintering aid suspension, preparing a ceramic fiber slurry, carrying out wet green body molding, drying the obtained wet green body, and carrying out pressurization sintering. The heat insulation tile has good heat insulation effect and mechanical performances, has light weight and resists high temperature; the density is controllable between 0.10g/cm<3> and 0.90g/cm<3>; the lowest apparent heat conduction coefficient at room temperature reaches 0.033W/(m.K); the compressive strength at room temperature is greater than 3.0Mpa; and the long-time use temperature can reach 1350DEG C.

The invention discloses a preparation method of a carbon fiber/toughened epoxy resin prepreg for a non-autoclave vacuum bag forming process. According to the method, the dissolution degree and the particle size of a curing agent and a toughening agent in epoxy resin are controlled by controlling a resin formula, the particle sizes of the curing agent and the toughening agent and process conditionsfor resin system configuration, and meanwhile, two modification effects are achieved: 1, the resin system is toughened; and 2, the requirements of a non-autoclave process on the viscosity of the resin in the prepreg and a room-temperature storage period are met. The prepared epoxy resin system is prepared into a rubber film, the carbon fiber/epoxy resin prepreg is further prepared by adopting a rubber film calendering method, and the semi-impregnated prepreg (unsaturated impregnated prepreg) is obtained by controlling the pressure and temperature during compounding of the rubber film and carbon fibers.

The invention discloses a precise intelligent winding machine and a winding control method thereof. The precise intelligent winding machine mainly comprises a support, a guide rail, a pressing arm component, a roller set, a belt feeding servo motor, a winding shaft and pneumatic equipment thereof, a central controller, a winding shaft belt pulley and a motor thereof, and the like. Wound fabric is wound on all rollers in the roller set sequentially through a feeding support, passes a guide roller on the pressing arm component, and then is wound on the winding shaft through a guide head. The pressing arm component is mounted on the guide rail and driven through a synchronous belt. The central controller controls rotational motion of a synchronizing wheel driving motor so as to control position and stepping speed of the pressing arm component, and controls rotational speeds of the belt feeding servo motor and the winding shaft so as to adjust and control tensile stress for winding the fabric. Density, the tensile stress and winding shape for fabric winding can be precisely controlled, the control method is simple and feasible, and a powerful guarantee is provided for smooth proceeding of subsequent dyeing.

The invention relates to a manufacturing method and manufacturing equipment of an optical fiber prefabricated rod, belongs to the field of manufacturing of an optical fiber prefabricated rod, and in particular relates to the method and the equipment which are used for collecting the surface temperature of a powder rod head by utilizing the infrared thermal imaging technology and participate in the controlling of the gas flow. By utilizing the method, the gas flow can be adjusted in real time, so that the density of the powder rod can be controlled accurately; and thus the cracking of the powder rod, caused by the large density gradient, is avoided. Therefore, the product quality is improved. The equipment comprises a tower body, a prefabricated rod depositing cavity body, a motor 1, a motor 2, a clamping disk, a lead screw, a metal hanging rod, a guiding rail, a quartz cavity body, a quartz target rod, a quartz spraying lamp 1, a quartz spraying lamp 2, a SiCl4 raw material tank, a GeCl4 material jar, a liquid Ar storage tank, a liquid O2 storage tank, a H2 storage tank, a gas control cabinet, an electromagnetic valve 1, an electromagnetic valve 2, a CPU (Central Processing Unit), a thermal infrared imager, an exhaust duct, a front treating tower, an electric dust-removing tower and a washing tower.

The invention discloses a laser-chemical preparation method of a monocrystal silicon substrate sub-micron pyramid structure, belonging to the field of crystalline silicon surface micro-structure preparation. The preparation method comprises the following steps: firstly, performing pretreatment on monocrystal silicon, and covering periodically close-packed microspheres on the surface of monocrystal silicon; performing irradiation by adopting a 248nm laser, wherein the single pulse energy density is 100-400mJ/cm<2>; performing certain treatment on a monocrystal silicon sample after irradiation, and removing the residual microspheres on the surface; after removal ends, dipping the monocrystal silicon sample into a sodium hydroxide aqueous solution containing ethanol under the environment that the water bath temperature is 70-80 DEG C, eroding for 10-30 seconds, taking out the monocrystal silicon sample, and washing by using deionized water to obtain a monocrystal silicon piece with a normal pyramid array. The laser-chemical preparation method disclosed by the invention exerts the laser controllability, can be used for rapidly and simply preparing the pyramid array with periodicity and uniformity, has high controllability in pyramid forming, can be used for adjusting the separation distance and morphology features of the pyramid array, also is low in raw material cost, and has relatively high practicability.

The invention provides an acid-free external formation method of a lead-acid storage battery and the lead-acid storage battery. During formation, a sulfuric acid electrolyte is substituted by a neutral electrolyte, acid mist pollution is prevented, and lead-containing wastewater generated during washing of the traditional external formation pole plate is avoided; meanwhile, the formation efficiency and the pole plate quality are superior to those of an internal formation process; and moreover, no waste acid is generated like the internal formation process, and the purposes of saving energy, reducing emission and also improving product quality are achieved.

The invention discloses an intelligent control system and a method for manufacturing an optical fiber prefabricated rod by using an OVD (optical variable device) and relates to the field of optical fiber manufacturing. The intelligent control system comprises a support device, at least one blowtorch, a diameter measuring device and a control device, wherein the support device is used for clampinga core rod to be processed; a weighing sensor is arranged on the support device; the weighing sensor is used for measuring the weight of a loosened body on the core rod in real time; the at least oneblowtorch is arranged on the support device; the diameter measuring device is used for measuring the outer diameter of the loosened body in real time; and the control device is used for receiving weight data transmitted from the weighing sensor and outer diameter data transmitted from the diameter measuring device, and used for adjusting the flow of the blowtorch according to the weight data and the outer diameter data, and thus the outer diameter and the density of the loosened body are both within preset ranges. By adopting the intelligent control system, the outer diameter size, the weightand the density of the loosened body can be precisely controlled.

The invention discloses a preparation method of density-controllable B10-rich boron carbide ceramic. The preparation method comprises the following steps: 1) drying B10-rich boron carbide powder; 2) weighing a certain amount of dried B10-rich boron carbide powder according to the designed density; 3) putting the weighed B10-rich boron carbide powder into a specially-made high-strength and high-density graphite mold cavity, heating the powder to 2100-2250 DEG C under a vacuum condition, and carrying out hot pressed sintering; and 4) performing pressurization after the pressure maintaining temperature is reached, wherien the pressure ranges from 10 MPa to 90 MPa and the heat preservation and pressure maintaining time ranges from 1 h to 2.5 h, and demolding the material after furnace coolingis conducted. The B10-rich boron carbide ceramic prepared by the preparation method disclosed by the invention solves the problem of low neutron absorption capacity; accurate control over the densityand the size of the boron carbide ceramic can be achieved through the hot-pressing mold by adopting the hot-pressing sintering process, the percent of pass of the boron carbide ceramic is increased, the machining and production cost is reduced, and the method is simple, effective and easy for industrial production.

The invention relates to the technical field of textile and discloses a weight control method for a braided fabric. The control method has the following advantages that 1, according to the method, a standard sheet is divided into a plurality of segments and is used as a modeling reference, and thus, a plurality of segmented linear control densities can be realized and a sweater sheet woven by the weight control method is uniform in density and is comfortable to wear; 2, by adopting the method, an operator does not need to have rich weaving experience and a common worker can attend a weaving machine by simple training, so that labor cost is reduced; 3, due to adoption of segmented control and real-time monitoring on the weight, generation of waste sheets is reduced and yield is obviously promoted, so that by adopting the method, the qualified rate of woven sweaters is also greatly improved; 4, by adopting the method, accurate control on the density and the weight can be implemented and the aim of saving yarns also can be fulfilled.

The invention discloses a transformer winding winding equipment using laser to track automatically. The transformer winding winding equipment using the laser to track automatically comprises a wire stretcher and a wire winding machine, the wire stretcher comprises wire winding frames and support frames, the wire winding frame sleeves a rotating shaft, a fixed gear is fixed on the rotating shaft, the fixed gear is connected with a tension device, and the tension device comprises a first gear engaged to the fixed gear and a second gear engaged to the first gear; the first gear sleeves a first screw rod, the second gear sleeves a second screw rod, one ends of the first and second screw rods are fixed on the support frame, the first screw rod is provided with a first brake block, the second screw rod is provided with a second brake block, the first brake block presses a first spring at the surface of the first gear, and the second brake block presses a second spring at the surface of the second gear; the wire winding machine comprises a pedestal, a moving frame capable of moving horizontally along the pedestal, a rotating shaft sleeves the moving frame, and a first motor connected with the rotating shaft, and a laser probe used for detecting the copper wire position of the transformer when winding an inner core of the transformer is fixed at the pedestal under the inner core of the transformer.

The invention provides a modified polyurethane carrier and a preparation method thereof, and aims to solve the technical problems of small specific surface area, poor adsorbability, poor toxicity impact resistance, poor fluidization property after biofilm formation and the like of the existing suspension carrier. The preparation method of the modified polyurethane carrier is characterized by comprising the following steps: S1, preparation of a coating modification liquid: mixing the following raw materials in parts by weight: 30 to 50 parts of powdered activated carbon, 3.0 to 8.0 parts of hollow glass micro-beads, 0.5 to 1.5 parts of riboflavin, 0.5 to 2.0 parts of L-cysteine, 1.0 to 3.0 parts of reduced iron powder, 1 to 4 parts of sodium carboxymethyl cellulose, 200 to 450 parts of water, 0.5 to 2.0 parts of an organic silicon wetting agent, and 8 to 20 parts of acrylic emulsion. and S2, preparation of a modified polyurethane carrier: infiltrating the outer surface and the inner hole surface of porous polyurethane foam with the coating modification liquid, and curing to obtain the modified polyurethane carrier.

The invention discloses a method for preparing a monovalent selective cation exchange membrane through modification, which comprises the following steps: 1) soaking a cation exchange membrane in a solution containing Fe < 3 + > ions at room temperature, stirring and standing the solution, and cleaning the surface with water to obtain an iron type cation exchange membrane; and 2) preparing a codeposition buffer solution of dopamine and polyethyleneimine, soaking the iron-type cation exchange membrane prepared in the step 1) in the solution at room temperature to react for 0.5-6 hours, taking out the iron-type cation exchange membrane, and washing the surface with clear water to obtain the monovalent selective ion exchange membrane. According to the method, Fe < 3 + > ions combined in the ion exchange membrane in advance serve as an oxidizing agent to promote rapid polymerization of dopamine, the Fe < 3 + > ions and polyethyleneimine are co-deposited on the surface of the membrane to form a stable modified layer, the operation process is simple, the prepared membrane is good in selectivity, and large-scale production is facilitated.

The invention discloses a heat-treating method for a nanocrystalline alloy strip. The heat-treating method comprises the following steps of (1), unwinding, tensioning, guiding and winding the nanocrystalline magnetically soft alloy strip along a path at a scheduled unwinding rate; (2), processing the nanocrystalline magnetically soft alloy strip with salt bath heating treatment along a section of the path; (3), carrying out constant temperature heating on the nanocrystalline magnetically soft alloy strip subjected to salt bath heating treatment; and (4), cooling the nanocrystalline magnetically soft alloy strip subjected to constant temperature heating. The invention also discloses a heat-treating device for the nanocrystalline alloy strip. According to the heat-treating method and device, salt bath heating treatment is utilized to conduct two-faced fast heating on the strip, so that surface passivation and crystal nucleus prefabrication heat treatment of the strip are achieved. Due to two-faced fast heating, the heat-treating method and device have the advantages that heat treatment time is controlled conveniently and heat treatment temperature is controlled precisely.