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249results about How to "Small aspect ratio" patented technology

Three degrees of freedom AC mixing magnetic bearing

The invention belongs to electrical transmission equipment field, particularly a new type three degrees of freedom alternating current hybrid magnetic bearing. An annular permanent magnet is employed to provide axial and radial static offset magnetic flux simultaneously. The three degrees of freedom alternating current hybrid magnetic bearing is consisted of a rotation shaft, rotor outboard aluminum sheet, rotor inboard aluminum sheet, axial stator outboard aluminum sheet, axial stator inboard aluminum sheet, annular permanent magnet, thin-sheet shaped axial stator, radial stator, radial winding and a rotor with a thin-sheet shaped end. One end of the rotor is a thin-sheet shaped structure used as an axial bearing, the rotor outboard aluminum sheet and the rotor inboard aluminum sheet are used to increase strength and fatherly reduce length-diameter ratio. Tripolar structure AC excitation is employed in radial direction, which provides control current by employing a triphase inverter. Aluminum sheets are used to increase strength and reduce length-diameter ratio in the invention, passive suspension is realized based on lamellate electric motor principle, which improves passive suspension ability. Axial spacing dimension occupied by the magnetic bearing is greatly reduced for that no excitation winding is needed.
Owner:JIANGSU UNIV

Drill pipe joint precision die forging process

The invention discloses a precise die forging technique of a petroleum drill rod connector and is characterized in that: 1) flan material is prepared with a band saw; 2) the flan material is heated quickly at a temperature that is suitable for forging by a medium frequency electric induction furnace; 3) then the flan material is extruded in a close type into a prefabricated flan and a flan makes concave die on a quick flan-making oil hydraulic machine; 4) a molding concave by die level method extrudes and presses the prefabricate flan into a connector die forging piece on the quick flan-making oil hydraulic machine which can implement combination of the upper molding concave die and the lower molding concave die and relative extrusion and pressing from right and left and inner holes of the connector die forging piece is provided with wad; 5) finally a hole punching die punches away the recess inside the inner hole of the forging piece on a special hole punching oil hydraulic machine to obtain the connector forging piece with accurate specifications, excellent structure performance and central through holes. The invention has the advantages of good streamline distribution, material conservation, environmental protection and high production efficiency.
Owner:JIANGYIN LONGCHENG DRILLING & PRODN MACHINERY MFG

Flexible display device and manufacturing method thereof

The invention discloses a flexible display device and a manufacturing method thereof and relates to the field of display. The manufacturing method is simple and can realize flexible display. In addition, the high-quality display picture can be obtained without a threshold voltage compensation circuit and an external driving integrated circuit. The method comprises the following steps: bonding a monocrystalline silicon diaphragm on a substrate, forming a driving circuit and an electroluminescence device on the substrate bonded with the monocrystalline silicon diaphragm, and packaging on the electroluminescence device with a transparent flexible cover plate, wherein the monocrystalline silicon diaphragm forms an active layer of a thin film transistor in the driving circuit; the thin film transistor comprises a first thin film transistor arranged in the display area of the flexible display device; the monocrystalline silicon outside the thin film transistor is removed from the monocrystalline silicon diaphragm; and the monocrystalline silicon diaphragm is sealed with the flexible diaphragm. The invention further provides a flexible display device manufactured by the method. Compared with the existing device, the flexible display device has the advantages of uniform brightness, simple structure and higher resolution.
Owner:BOE TECH GRP CO LTD +1

Manufacturing method of high density fiberboard for whitened type E1 grade floor substrate

The invention relates to a manufacturing method of a high density fiberboard for a whitened type E1 grade floor substrate, which comprises the steps of wood chipping and screening, pre-stewing and stewing, defibrator process for causing fiber separation, concoction of E1 grade urea formaldehyde resin glue, curing agent preparation, the application of urea-formaldehyde glue, curing agents and paraffins, drying, paving, hot pressing, cooling and tempering, and sanding and saw cutting, and is characterized in that woods are selected from major diameter cottonwoods with diameters larger than 8cm, are evenly chipped and are then placed in an outdoor storage yard to be fermented for 5 to 15 days; in the concoction process of the E1 grade urea formaldehyde resin glue, urea is added at 5 times; and the curing agents are formed by preparing phosphoric acid accounting for 3 to 5 percent of the total content, urotropin accounting for 1 to 3 percent of the total content, triethanolamine accounting for 1 to 3 percent of the total content, and ammonium sulfate accounting for 19 to 21 percent of the total content. The obtained whitened type E1 grade floor substrate has the advantages of little surface impurity, fine and smooth fiber, white color, good visual effect, reasonable density distribution and moderate intensity, and is frequently used for producing top grade indoor laminate flooring and composite floors.
Owner:DARE TECH

Oxygen-enriched combustion W-shaped flame boiler system and combustion process thereof

The invention provides an oxygen-enriched combustion W-shaped flame boiler system and a combustion process thereof. Flue gas discharged from a dewaterer is divided into two strands, wherein one strand of flue gas sequentially enters a desulfurization device and a CO2 recovery device and the other strand of flue gas enters a gas-gas heat exchanger and is heated by flue gas in a main flue; the flue gas in the main flue also heats O2 separated in the air when heating the recycled flue gas; the heated recycled flue gas is divided into three strands; O2 is divided into two strands; after the first strand of O2 is mixed with the first strand of recycled flue gas, the mixed gas enters a coal mill and enters a primary air pipeline; after the second strand of O2 is mixed with the second strand of recycled flue gas, the mixed gas enters a furnace arch secondary air pipeline; and the third strand of recycled flue gas enters a front and rear wall secondary air pipeline The system provided by the invention overcomes the defects in the prior art and greatly improves ignition conditions of a hearth; when the radiation and heat adsorption area of a lower hearth is effectively increased, slag-bonding possibility is greatly reduced; efficiency of the integral system is improved; steel consumption and manufacturing cost of a boiler are reduced; and zero emission of CO2 can also be realized.
Owner:SHANGHAI BOILER WORKS

Through silicon via (TSV) structure and manufacturing method thereof

The invention relates to a TSV structure and a manufacturing method thereof, which include forming a window in a former medium layer and a semiconductor substrate, and forming a second blocking layer in the window before forming a plurality of interlayer medium layers; forming a through hole after forming the plurality of the interlayer medium layers, wherein the hole diameter of the through hole is smaller than that of the window after the second blocking layer is formed, accordingly, surplus initial filling medium layer forms a filling medium layer between the through hole and the window after the second blocking layer is formed; forming a first blocking layer and through hole metal in the through hole afterwards, so that a three layer isolating structure comprising the first blocking layer, the filling medium layer and the second blocking layer is formed between the through hole and the semiconductor substrate. The continuity of the isolating structure is improved, the problem of the degradation of semiconductor devices caused by the fact that conductive materials of the through hole metal diffuse into the semiconductor substrate is further effectively solved, and the reliability of semiconductor devices is improved.
Owner:SHANGHAI INTEGRATED CIRCUIT RES & DEV CENT

Planetary-harmonic composite gear reducer

The invention relates to a planetary-harmonic composite gear reducer, which relates to a reducer, and aims at the problems that the prior cup-shaped harmonic reducer has small reduction ratio, large axial size, large volume, large mass and the like. A sun gear is engaged with at least two planetary gear shafts and is arranged in an elliptical internal gear ring of an elliptical cam, the at least two planetary gear shafts are engaged with the elliptical internal gear ring of the elliptical cam to form a primary planetary reduction gear train, the elliptical cam is arranged in a flexible ball bearing, the primary planetary reduction gear train and the flexible ball bearing form a wave generator, the flexible ball bearing is arranged in a flexible gear, the flexible gear is arranged in a rigid internal gear ring and is engaged with the rigid internal gear ring under the action of the wave generator, and a planetary gear shaft arranged in a shaft hole of a tie bar is provided with a rolling bearing. The reducer has the advantages of large reduction ratio, small axial size, small volume, light mass and the like, and is particularly suitable to be applied in the fields such as aviation and space detectors, various instruments and meters, and driving units of precision robots and the like.
Owner:成都川哈工机器人及智能装备产业技术研究院有限公司

Manufacture method of vermicular cast iron steam cylinder cover

The invention relates to a manufacture method of a vermicular cast iron steam cylinder cover. The vermicular cast iron steam cylinder cover is manufactured by the following ingredients according to the following mixture ratio: 75 percent to 85 percent of foundry returns and 15 percent to 25 percent of waste steel. External desulfurization is carried out after the melting, the melting temperature is controlled to be higher than 1500 DEG C, the weight percent of sulphur in desulfurized molten iron is 0.008 percent to 0.2 percent, and ingredients after the refining comprise 3.70 percent to 3.80 percent of carbon, 1.50 percent to 1.60 percent of silicon, at most 0.30 percent of manganese, at most 0.50 percent of phosphorus and 0.008 percent to 0.012 percent of sulphur. The molten iron can be perfectly subjected to vermicularizing treatment, the vermicularity is controlled to be in a proper range, the influence on the vermicularity caused by sulphur content fluctuation is avoided, the casting rejection caused by unqualified vermicularity is reduced, and the cost is reduced. In addition, the vermicular shape can be perfectly controlled, further, the mechanical performance of the vermicular cast iron can be regulated, and the performance requirement of the steam cylinder cover is met.
Owner:RIYUE HEAVY IND

Deep hole machining manipulator

The invention discloses a deep hole machining manipulator, which comprises an arm assembly, a working device and a control system, wherein the arm assembly can be used for at least providing axial feed and peripheral feed; the working device is fixed at the output end of the arm assembly, and is used for machining or detecting; the control system is used for controlling the feeding direction of the arm assembly and the working state of the working device; and the arm assembly comprises a fixed arm, a telescopic arm which is axially connected to the fixed arm at a single degree of freedom in a sliding way, and a rotating arm which is circumferentially connected to the telescopic arm at a single degree of freedom. Due to the adoption of the deep hole machining manipulator disclosed by the invention, deep hole machining and detecting can be performed by breaking through the limit of a deep hole aperture, the length-diameter ratio of a tool can be reduced greatly, the tool has high strength and high rigidity, the deep hole machining accuracy and surface quality can be ensured, the machining requirements of special structures such as inner splines machined in deep holes, in-hole curve structures, inner spiral grooves, and curved teeth are met, and integral machining and forming of deep hole parts having the special structures are realized.
Owner:CHONGQING TECH & BUSINESS INST

Preparation of magnesia crystal whisker

The invention relates to the field of inorganic and non-metal material preparation, in particular discloses a method of using magnesite or brucite as raw material to prepare magnesia whiskers by technologies of calcinations, fine grinding, hydration, carbonization, solid-liquid separation, dilution, pyrolysis, filtration, drying and calcination. The method comprises the following steps: adding 0.1 percent to 2.0 percent of soluble magnesium salt to high-magnesian water with the concentration of 3-100kg/1000L to be pyrolyzed at a temperature of 40 DEG C to 80 DEG C under the stirring intensity of 50-500 round/min; firstly, preparing precursor magnesium carbonate whiskers; further calcining the whiskers at a temperature of 500 DEG C to 800 DEG C to obtain magnesia whisker products which have favorable crystallization growth, high purity and slenderness ratio and good dispersion and can be applied to the fields of material, chemical engineering, machinery, and the like, and the precursor magnesium carbonate whiskers can be also applied to the fields of material, chemical engineering, and the like and the preparation of magnesium hydrate, bitter salt, magnesium chloride, magnesium nitrate and other magnesium salt products. The method has simple technology, little investment and low production cost, has no pollution in a production process and can utilize various grades of magnesite and brucite lump ores and powder (tailing) to prepare the magnesia whiskers.
Owner:NORTHEASTERN UNIV
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