922results about How to "Uniform stress distribution" patented technology

The invention relates to an aqueous binder which is compounded and modified by micro nano material. The modified aqueous binder of the invention adopts emulsion adhesive as matrix and micro-size and nano-size inorganic powder as modifier to prepare the compound and modified aqueous binder. The method of the invention can not only enhance the interface binding force of the aqueous binder, but also greatly improve the properties of water resistance, toughness and extensibility, leading comprehensive performance of the aqueous binder to be improved.

An improved anchor device or fastening member which is particularly suited for use in the attachment of various fixtures and equipment to masonry, concrete, and other hard and/or friable substrates includes a head and a shank depending therefrom. The shank has a first threaded portion having a predetermined thread angle and a predetermined hardness, and a second threaded portion having a predetermined thread angle and a predetermined hardness. The first threaded portion is proximate to the head and the second threaded portion extends from the first threaded portion. The thread angle of the first threaded portion is different than the thread angle of the second threaded portion. In addition, the hardness of the first threaded portion is softer than the hardness of the second threaded portion. This provides for a more ductile anchorage when the fastening member is engaged with the substrate.

A capacitor microphone is constituted by a plate having a fixed electrode, a diaphragm including a center portion and at least one near-end portion that is fixed to the outer periphery, in which the center portion having a vibrating electrode, which is positioned relative to the fixed electrode and which vibrates in response to sound waves, is increased in rigidity in comparison with the near-end portion; and a spacer that is fixed to the plate and the near-end portion of the diaphragm and that has an air gap formed between the plate and the diaphragm. Alternatively, a diaphragm electrode is horizontally supported by extension arms extended from a circular plate thereof and is vertically held in a hanging state being apart from a fixed electrode with a controlled distance therebetween.

The invention relates to a shaft-end overhung piezoelectric cantilever beam electric generator, and belongs to the technical field of new energy resources and power generation. A left end cover and a right end cover are respectively installed at two ends of a shell body through screws. A semi-annular balancing weight is installed on the lower side of the interior of the shell body through a screw. The upper portion of the left end cover and the upper portion of the right end cover are respectively provided with a lightening hole. A magnet I and a bearing are embedded in the inner side of the bottom wall of the left end cover. A magnet I and a bearing are embedded in the inner side of bottom wall of the right end cover. A piezoelectric vibrator is arranged between the left end cover and the shell body in a compression joint mode. A piezoelectric vibrator is arranged between the right end cover and the shell body in a compression joint mode. A magnet II and a frequency-modulation mass block are installed at the free end of each piezoelectric vibrator. A rotating shaft of a rotor is installed on the left end cover and the right end cover through bearings. A connecting disc is installed at one end of the rotating shaft through a nut. A magnet III is embedded in a rotating disc of the rotor. The shaft-end overhung piezoelectric cantilever beam electric generator has the advantages that the piezoelectric vibrators are motivated for electric generation and external fixing and supporting are not needed; the shaft-end overhung piezoelectric cantilever beam electric generator is an integrated type individual component, so that the structure of a rotating body does not need to be changed, and the shaft-end overhung piezoelectric cantilever beam electric generator is convenient to install and maintain; the shaft-end overhung piezoelectric cantilever beam electric generator is high in reliability, strong in power generation capacity, and wide in velocity zone.

The invention provides a process for manufacturing a high-strength (above) bolt. The process comprises the following steps: selecting a proper steel material, and cutting out a cylindrical blank with proper size; molding the head part and the rod part of the bolt by adopting cold extrusion technology; heating; manufacturing the rod part, including coarse grinding and fine grinding; detecting injury by magnetic powder; manufacturing screw; and performing surface mechanical reinforcement and corrosion resistance treatment. The process solves the technical problems of insufficient strength and fatigue fracture which are easily generated on the bolt existing in the prior art for manufacturing the high-strength bolt, and is a high-strength bolt manufacturing process capable of improving tensile and fatigue strength resistance of the bolt.

A planetary gearset includes a sun gear member having a sun gear body made of a steel material and an outer periphery with a plurality of teeth formed thereon. Each of the sun gear teeth has at least one mating surface for engaging mating surfaces on complementary teeth on at least one planet gear. A fatigue-resistant coating is applied to the mating surfaces of the sun gear teeth. The coating is harder and more abrasive than the mating surfaces of the planet gear teeth.

The invention discloses a multiple-ammoniation polyacrylonitrile-based carbon fiber spinning solution and a preparation method of the multiple-ammoniation polyacrylonitrile-based carbon fiber spinning solution. The preparation method comprises the steps of combining acrylonitrile, methyl acrylate, 2-acrylamide-2-methylpro panesulfonic acid and itaconic acid to be a polymer monomer, respectively and sufficiently dissolving the weighed solid monomer (itaconic acid) and an initiator (azodiisobutyronitrile) into a dimethyl sulfoxide solution; conducting ammoniation on the dimethyl sulfoxide solution of the itaconic acid by ammonia water; and sequentially adding all the materials into a polymerizing pot, adding the initiator (azodiisobutyronitrile) to conduct batch polymerization reaction, gathering, defoaming and filtering to obtain the multiple-ammoniation polyacrylonitrile-based carbon fiber spinning solution. According to the multiple-ammoniation polyacrylonitrile-based carbon fiber spinning solution and the preparation method, the comonomer structure of a multiple-copolymerization system is changed by the ammonia water, and dimethyl sulfoxide is taken as a solvent for homogeneous solution polymerization to prepare the polyacrylonitrile-based carbon fiber spinning solution, so that the hydrophily of the spinning solution is improved, and further, the high-performance fiber with high structure compacting degree, good mechanical property and high bonding strength is obtained.

The invention discloses a transverse sliding symmetrical loading structure which essentially consists of two sliding frames, a true triaxial pressure chamber, two groups of supports and two groups of slideways in the shape of an intersecting parallel. The two sliding frames are orthogonally and transversely arranged, on each of which is sequentially fixed with a main frame transom, a subframe transom, a pair of frame transverse columns, four pairs of cage nuts, a hydraulic jack and a counterforce base. The frame transverse columns are connected with the main frame transom and the subframe transom, external cage nuts and internal cage nuts fix the frame transverse columns, the main frame transom and the subframe transom, and the hydraulic jack and the counterforce base are respectively arranged inside the main frame transom and the subframe transom; the true triaxial pressure chamber is arranged in the center of the two sliding frames; the two sliding frames are arranged in the slideways through a group of corresponding supports and can freely move within a certain range. The structure can ensure the internal stress to be uniformly distributed in the test sample during loading, and has the advantages of convenient test sample loading and unloading, simple structure and relative low cost.

In an electroacoustic transducer, a pair of coil terminals elongating from a voice coil are electrically connected to a pair of terminal members attached to a frame via a flexible printed circuit board, respectively. According to the configuration, even in a case where an electroacoustic transducer is used at a high sound pressure, breakage of the coil terminals hardly occurs. In the flexible printed circuit board, the width of an intermediate portion is set to be smaller than the widths of an end portion on the side of the coil terminals and an end portion on the side of the terminal members. Therefore, the flexibility of the intermediate portion can be enhanced, whereby transmission of characteristic vibration of the flexible printed circuit board to a diaphragm, and stress concentration in the vicinity of the end portions are effectively suppressed.

The invention discloses a steel wire rope twist direction climbing robot. The steel wire rope twist direction climbing robot includes a plurality of modules, wherein climbing devices are arranged in outer shells of the modules, the climbing devices include tensioning supports, rolling wheels are mounted in tensioning supports, rubber sheets are arranged on the circumferences of the outer edges ofthe rolling wheels, shafts are arranged on the back sides of the tensioning supports, holes are formed in the outer shells close to the shafts, linear bearings are mounted at the positions of the holes, the shafts of the tensioning supports penetrate through the linear bearings and the holes, limiting anti-loose nuts are mounted on shafts outside the outer shells, and springs are further arrangedbetween the back sides of the tensioning supports and the inner walls of the outer shells. Compared with the prior art, the steel wire rope twist direction climbing robot can roll in the direction ofa spiral line twisted in a steel wire rope, the needed driving force is smaller and stable, and the bearing capacity is high; and the climbing robot can work under a special environment and can meet the requirement of anti-explosion; and the shafts of the tensioning supports move telescopically relative to the linear bearings, and the certain buffering obstacle crossing ability and the disturbanceresistant capacity are achieved.

The invention belongs to the technical field of lithium ion batteries, and in particular relates to a lithium ion battery cell which comprises at least two positive electrode plates, at least two negative electrode plates, a first wound membrane and a second wound membrane, wherein the positive electrode plates and the negative electrode plates are mutually overlapped, and the difference of the number of the positive electrode plates and the number of the negative electrode plates is one; the positive electrode plates are arranged at the same side of the first membrane; the negative electrode plates are arranged at the same side of the second membrane; and at the direction from the innermost circle to the outermost circle of the battery cell, the first membrane and the second membrane are alternatively arranged between the adjacent positive electrode plates and the negative electrode plates at intervals. Compared with the prior art, the lithium ion battery cell has the advantages that the parallel connection multiple layers of electrode plates provided by the invention can be used for reducing the internal resistance of the battery cell, thus the polarization is reduced, and the discharging platform is improved; the parallel connection of the electrode plates can be used for improving the high-multiplying-power charging and discharging capability of the battery cell; and because the electrode plates of the battery cell provided by the invention are stacked together, the internal structure is unified, the stress is distributed uniformly, the possibility of deformation is small. In addition, the invention also discloses a preparation method of the battery cell.

The invention provides a preparation method of a fine grain copper alloy shaped charge liner. The preparation method of the fine grain copper alloy shaped charge liner comprises the following steps: carrying out compound cold extrusion plastic deformation, carrying out deep overcooling treatment, and carrying out recrystalization annealing, wherein the compound cold extrusion plastic deformation comprises the steps of putting a blank into a mould cavity of a preformed blank forming mould, carrying out forward extrusion forming to obtain a designed copper alloy preformed blank under the actions of three-dimensional compressive stress and deformation rate and then putting the preformed blank into a mould cavity of a shaped charge liner forming mould and gradually forming the shaped charge liner preformed blank by carrying out gradual-pass diameter-expanded extrusion plastic deformation, thus obtaining the shaped charge liner blank of a required shape structure; the deep overcooling treatment comprises the step of carrying out heat preservation on the shaped charged liner blank for 2-4 hours at the temperature ranging from -196 DEG C to 130 DEG C; and the recrystallization annealing comprises the step of carrying out heat preservation on the shaped charge liner (subjected to deep overcooling treatment) for 5-15 minutes at the temperature of 450-550 DEG C in a protective atmosphere, thus obtaining a shaped charge liner component. The preparation method of the fine grain copper alloy shaped charge liner has the advantages that strict requirements of the shaped charge liner on grain structure homogeneity, consistency of performance and stress state and distribution can be met, and quality of the shaped charge liner can be improved.

The invention relates to a method for preparing a magnesium alloy material suitable for biological implantation, which comprises the following steps: preparing raw materials by the following chemical compositions in percentage by weight: 2.0 to 6.0 percent of Zn, 0.5 to 1.9 percent of Mn, 0.6 to 5.0 percent of Ca, less than or equal to 0.1 percent of total impurities, and the balance of Mg; or preparing the raw materials by the following chemical compositions in percentage by weight: 2.0 to 6.0 percent of Zn, 0.3 to 0.9 percent of Zr, 0.5 to 5.0 percent of Ca, less than or equal to 0.1 percent of total impurities, and the balance of Mg; preheating smelting equipment and adding the Mg into the raw materials; heating the mixture under the protection of argon gas with the flow rate of between 5 and 6 L/min and the pressure of 14 MPa; adding a fire retardant into the molten liquid when the temperature of the molten liquid reaches between 650 and 660 DEG C, raising the temperature of the molten liquid to between 700 and 720 DEG C, adding other alloy elements into the molten liquid respectively, and performing melting reaction; and stirring the mixture until the mixture is uniformly mixed after alloy is completely molten, keeping the mixture stand for 30 to 40 minutes, pressing a deslagging agent into the solution for deslagging, casting the alloy solution into a cast die after keeping the alloy solution for 10 to 20 minutes at the temperature of between 690 and 710 DEG C, and preparing a Mg-Mn series or Mg-Zr series biomedical magnesium alloy material ingot.

The invention discloses a bionic texture and coating layer cooperated anti-friction cutter and a design method thereof. The cutter adopts a basal body material of high-speed steel, hard alloys or ceramic; a bionic micro pit and micro projection composite texture is arranged in a cutter-chip contact area on the front cutter surface of the basal body material of the cutter; AlZrTaC+TiVBN alternate-distributed nanometer laminate coating layers are arranged on the surfaces of the texture and a basal body; the alternate laminate coating layers at least comprise single layers of 10 AlZrTaC layers and 10 TiVBN layers; and the thickness of the single layers of AlZrTaC and TiVBN is not bigger than100 nm. The design method of the cutter comprises the following steps: a design model of a micro texture on the surface of the cutter-chip contact area on the front cutter surface of the cutter is built; the oil film pressure and the friction coefficients of the cutter-chip contact interface are analyzed based on a Reynolds equation to optimize the geometric size of the micro texture and the depth or height gradual change dip angles theta 1 and theta 2; and through physical compatibility and chemical compatibility analysis, a laminate structural form of AlZrTaC+TiVBN coating layers is built. The cutter synthesizes the characteristics of the micro texture and the nanometer laminate coating layers, can reduce the friction and the wear of the cutter in the lubricating liquid cutting process, and can be widely applied to the cutting in the cutting liquid mode.

The invention provides a method for preparing a high-strength high-density isotropic graphite material. According to the method, pitch mesocarbon micro bead (MCMB) powder of which the D50 is larger than 20 micrometers, and the volatile content is less than 7 percent is taken as a raw material, and the high-strength high-density isotropic graphite material is prepared by adopting the self-sintering process that the raw material powder is added into an organic solvent of pitch, the solvent is removed, the powder is pressed, a green briquette is formed through isostatic compaction, roasting and carbonization are performed, and graphitization is performed. According to the method, an organic solvent method is utilized to disperse bitumastic cement, so as to realize the modification on MCMB powder with large size and low volatile matter, the original shapes and sizes of the MCMB particles are basically kept after modification, good self sinterability is realized, and the finally obtained graphite is fine and uniform in structure, high in density and excellent in mechanical property. The pitch of the dispersed and modified MCMB is distributed uniformly, the inner stress of the green briquette in the isostatic compaction step is more uniformly distributed, and balanced expansion and shrinkage in the working procedures of roasting and graphitization are realized, and therefore, a product is not liable to crack, and the yield reaches not less than 90 percent.