139results about How to "No creep" patented technology

The invention discloses a ceramic core for silica sol precision casting and a manufacturing process thereof. Main body components of the ceramic core comprise refined quartz powder and a proper amount of collapsing agent, and the surface of the ceramic core is coated with high-temperature resistant paint with a thickness of 0.1 to 0.2 millimeter; and at the same reasonable manufacturing processes such as mixing, core making and roasting are adopted. In the ceramic core for casting, the unique material mixing and manufacturing processes are adopted, and the reasonable use of the refined quartz powder and the collapsing agent improves the collapsibility of the ceramic core after casting considerably, the high-quality high-temperature resistant material in ingredients enables the core to resist the erosion of high-temperature molten metals, and the high-temperature resistant paint on the surface of the ceramic core not only improves the high temperature resistance during casting, but also increases the cooling speed of the molten metal.

The invention relates to a test sample for tensile properties of a large tow carbon fiber multifilament and a sample preparation method thereof, and belongs to the field of material property testing.The method comprises the steps that tension is applied to wind the carbon fiber multifilament of not less than 24 k around a frame; gum dipping, gum leaching and heat curing are conducted on the framewound with the multifilament, and the gum-dipped multifilament is cut into multifilament segments after cooling; a set of metal or composite reinforcing sheets are respectively bonded to the two endsof the multifilament segments, wherein each set includes two reinforcing sheets disposed oppositely, a structure glue film is bonded to the inner surface of at least one of the two reinforcing sheets, the middle region and the peripheral edge region of the inner surface are vacated in bonding, and the two ends of the multifilament segments are located in the middle region; the reinforcing sheetsare pressed, heated and cured to obtain the test sample. By adopting the method, the mechanical properties of the reinforcing sheets are improved, the bonding strength between the multifilament and the reinforcing sheets is improved, and the problems of tear damage of the reinforcing sheets and debinding and slippage of fiber when the obtained test sample is used in a tensile test are avoided.

The invention discloses a polytetrafluoroethylene material. The polytetrafluoroethylene material consists of the following components in parts by weight: 6-7 parts of polytetrafluoroethylene, 0.8-1.2 parts of molybdenum disulfide, 0.5-2.5 parts of carbon fibers and 0.5-2.5 parts of para-position polyphenyl. In the formula developed by the invention, the carbon fibers have the characteristics of no creep deformation, high intensity and high fatigue resistance, so that the defect of the creep deformation of the polytetrafluoroethylene raw materials is overcome, and the hardness of products is strengthened; the molybdenum disulfide has extremely good lubrication effect, so that the products have a better oil-free self-lubricating characteristic; the para-position polyphenyl has the characteristics such as high temperature resistance, good heat stability, corrosion resistance, superior self-lubricating property and the like, and the integral comprehensive properties of the materials can be further improved. Therefore, the products prepared from the raw materials which are formed by mixing the polytetrafluoroethylene, the carbon fibers, the para-position polyphenyl and the molybdenum disulfide according to the proportion have extremely good abrasion resistance, extremely good high temperature resistance, extremely good stability and extremely good pressure resistance.

The invention relates to a PE (polyethylene) wood-plastic composite material with the high modulus. The PE wood-plastic composite material comprises components in parts by weight as follows: 30-50 parts of wood meal, 20-30 parts of a PE plastic alloy, 10-20 parts of calcium carbonate, 20-30 parts of chopped glass fibers, 1-5 parts of maleic anhydride grafted PE, 1-5 parts of a silane coupling agent, 1-3 parts of a lubricant and 1-3 parts of an antioxidant. A preparation method of the PE wood-plastic composite material comprises steps as follows: the modified glass fibers, the modified wood meal, the PE plastic alloy, the calcium carbonate, 50% of the maleic anhydride grafted PE, the lubricant and the antioxidant are added to a high-speed mixer in proportion to be evenly mixed, granulated, extruded and molded, and a wood-plastic composite material profile is obtained.

The invention provides a moistureproof underground cable protection device, and belongs to the technical field of a cable. The device comprises a moistureproof underground cable and a protection sleeve. The moistureproof underground cable comprises a cable body. The cable body comprises conduction cores, an insulation layer I, a lining layer, a first waterproof layer, a metal sheath, a second waterproof layer and a jacket layer, from the inside to the outside. There are multiple conduction cores. An insulation layer II is wrapped out of the conduction cores. Cross-linking polyolefin is filled among the conduction cores. Carbon fibers are doped in the cross-linking polyolefin. The protection sleeve is sleeved out of the moistureproof underground cable. The protection sleeve comprises a protection sleeve body. The shape of the protection sleeve body matches the shape of the moistureproof underground cable. The inner surface of the protection sleeve body is a structure that concave surfaces and convex surfaces are alternated. An anticorrosive material is coated on the inner surface. According to the device, the structure of an existing underground cable protection device is improved and optimized; the comprehensive performance of the cable is improved; in particular, the corrosion resistance is remarkably improved; and the waterproof performance is excellent; and the stability is high.

Provided in the invention is a flat cable of an elevator. The flat cable comprises metal guide cores, insulating layers, and a protection sleeve layer; and the insulating layers and the protection sleeve layer are made of PVC materials. The cable is characterized in that carbon fiber layers coat the outsides of the insulating layers; and a filling layer is arranged between the carbon fiber layers and the protection sleeve layer, wherein the filling layer is polypropylene added with alpha- alumina. The carbon fiber layers are made of flexible carbon fibers. And a talcum powder layer is arranged between the filling layer and the protection sleeve layer. In addition, the flat cable also contains ripping cords located in the protection sleeve layer. According to the flat cable, on the one hand, the tensile strength of the cable is enhanced and the service life of the cable is prolonged; and on the other hand, the signal transmission stability of the cable is improved and thus safety of the elevator running is improved and the elevator maintenance cost is lowered, thereby saving resources and enhancing the efficiency.

The invention discloses gum dipping flame retarding canvas which comprises warps and wefts, wherein the warps are twisted aramid fibers (3), and the wefts are stranded dacron fibers (1) and stranded carbon fibers (2) that are arranged at intervals. The invention further provides a manufacturing method of the gum dipping flame retarding canvas. According to the gum dipping flame retarding canvas, an oxygen content of air is 21% generally, while the limit oxygen indices of the aramid fibers are greater than 28%, so that the aramid fibers are fire-retardant, cannot be burnt in the air or support combustion, and have self-extinguishment ability. The aramid fibers are flame-retardant permanently due to inherent characteristics of molecular structures of the aramid fibers, and have a good name of 'fire-proof fibers'; for the wefts, the stranded dacron fibers are adopted for reinforcement due to poor tenacity of the carbon fibers, so as to meet yield effect requirements and weft tension strength requirements; and gum dipping adhesion strength can be improved. Carbon contents of the carbon fiber do not exceed 90% generally, and the carbon fibers are good in flame retardancy, and cannot generate smoke and flame during high oxygen combustion.

The invention relates to a pressure-type carbon fiber prestressing force anchor cable land-sliding control structure, comprising an anchor cable which is composed of carbon fiber bundles with more than 3500Mpa of tensile strength, and a polrvinyl chloride sleeve is wrapped at the outer side of the carbon fiber bundles, cement mortar is poured at the outer side of the polrvinyl chloride sleeve, an anchor cable bore is arranged at the outer side of the cement mortar, and a bearing steel plate is arranged at the end part of the carbon fiber bundles. The structure has the characteristics of light weight, high tensile strength, corrosion resistance and long service life.

The invention discloses a manufacturing process for a carbon fiber composite forming membrane disk. The manufacturing process comprises the steps that a prepreg is slit into a prepreg body in a certain shape and angle; a mold is cleaned and coated with a mold releasing agent; a heating platform is used for carrying out preheating treatment on the cut prepreg body; the prepreg body is laid to forma carbon fiber composite layer in a regular shape; a vacuum membrane bag is used for carrying out sealing treatment, and vacuumizing is carried out to form negative pressure; an oven is used for heating and solidifying the carbon fiber composite layer; the cooled carbon fiber composite layer is separated from the mold; the carbon fiber composite layer is cut and polished, and a finished product ofthe carbon fiber composite forming membrane disk is obtained. The membrane disk manufactured through the method has high-content fiber, the surface is bright without bubbles, the interlayer bonding intensity achieves an effect of a compression molding process, and the requirement for carbon fiber composite product production in the fields of aerospace and navigation.

A large precise magnetic levitation direct-drive rotating workbench comprises a driving motor of a rotating workbench body, an angular displacement feedback system, a radial active type bias magneticlevitation bearing, an axial active type bias magnetic levitation bearing, an axial protecting bearing and a radial protecting bearing; the rotating workbench body and the active type bias magnetic levitation bearings restraining the axial movement and the radial movement of the rotating workbench body are arranged, and the protecting bearings, braking devices and a position feedback system are arranged; and a signal of the position feedback system is output to a control system to control the driving motor an the braking devices. The large precise magnetic levitation direct-drive rotating workbench is characterized in that the rotating workbench body achieves magnetic levitation supporting through the active type bias magnetic levitation bearings, and the rotating workbench body is directly driven through a permanent magnetic synchronous torque motor. According to the large precise magnetic levitation direct-drive rotating workbench, friction of mechanical bearings is eliminated, machining and assembling are easy, and the transporting and maintaining cost is low. The revolution precision is high, the bearing capacity is high, power consumption is low, no crawling is caused during ultra-low-speed operation, and the large precise magnetic levitation direct-drive rotating workbench can be widely applied to the fields of astronomical observation instruments, numerical control machine tools, radars, precise rotating tables and the like.

The invention discloses a carbon fiber reinforcement aluminum alloy mortise and tenon structure which comprises a mortise piece and a tenon piece, wherein the mortise piece is provided with a mortise; a tenon connection part of the tenon piece is inserted into the mortise; at least one inner surface of the mortise is coated with carbon fiber composite cloth; and the tenon connection part is in interference fit with the mortise coated with the carbon fiber composite cloth. The carbon fiber is high in axial strength and module, low in density, high in specific performance, good in fatigue resistance, low in thermal expansion coefficient and good in corrosion resistance, has no creep deformation, has superhigh temperature resistance at the non-oxidizing environment and has anisotropism, and the specific heat and conductivity of the carbon fiber is between the specific heat and conductivity of nonmetal and the specific heat and conductivity of metal. With the utilization of the carbon fiber composite cloth to reinforce the mortise and tenon structure, a tenon pulling phenomenon of the mortise and tenon structure can be retarded effectively. The carbon fiber reinforcement aluminum alloy mortise and tenon structure has the characteristics of high strength and rigidity, reduction in energy consumption ability, and the like, and can be widely applied to the fields of automotive industry, sports equipment, fire protection, and the like.

The invention discloses a high-temperature-resistant titanium alloy material for 3D printing. According to the high-temperature-resistant titanium alloy material, a titanium alloy is matched with an amorphous metal, the temperature resistance, strength and toughness are improved through doping titanium carbide ceramic, and the amorphous metal has a structure crystallization tendency when a temperature rises, so that the titanium alloy has no creep deformation under a high-temperature condition of 650 DEG C, thus the defect of no high-temperature resistance of metal products subjected to titanium alloy 3D printing is overcome. An application of manufacturing high-temperature-resistant complex equipment such as a titanium alloy engine by virtue of a 3D printing technology is further promoted.

The invention provides a method for preparing steel lining washing rollers, which includes the following steps: firstly preparing a steel lining roller; then winding the steel lining roller with a carbon fiber layer, wherein during the winding process, frictioning is performed manually while winding to increase the content of carbon fiber; placing the steel lining roller wound with the carbon fiber layer in a curing box for heating and curing; performing the skim coating on the roller surface subjected to curing; finally preparing the finished steel lining composite carbon fiber washing roller. The finished steel lining composite carbon fiber washing roller prepared through adopting the method provided by the invention has the advantages of light weight, antifatigue, excellent rigidity, corrosion resistance and long service life.

The invention relates to paper diapers, elastic composite materials and other care products, particularly a zero-creep low-temperature rubber string adhesive and a preparation method thereof. The invention is characterized in that the zero-creep low-temperature rubber string adhesive is mainly prepared from the following raw materials in parts by weight: 15-27 parts of high-compatibility softening agent, 45-80 parts of tackifying resin and 20-35 parts of SBC (styrene block copolymer) or SIS (styrene-isoprene-styrene). The zero-creep low-temperature rubber string adhesive has excellent coatability, and can be firmly attached to the rubber string, so that the rubber string does not have creep; and the zero-creep low-temperature rubber string adhesive has excellent adhesion effects on natural rubber strings, spandex fibers, Lycra fibers and many other rubber string materials, and can implement zero creep rate of the rubber string.

The invention relates to a railway industry and electricity integrated electric switch device with a central locking polar integrated control unit. A high-strength anti-retreating moving lock mechanism, an integrated visible lock checking expression mechanism, a closed oil immersion overload unloading double speed transmission mechanism, a double speed, rapid stopping and high-efficiency permanent magnet direct-current motor and the like are integrated to form a compact non-squeezable central locking electric switch machine, wherein the high-strength anti-retreating moving lock mechanism is composed of a ball iron box seat / a heavy-duty bearing / an upper rack moving lock rod / a short and thick tooth crest lock; a lock checking rod / a direct-acting contact expression switch / a four-head lock checking block / a spiral starting disk / an axial quick-acting ring which are flatly placed and connected by body separation form the integrated visible lock checking expression mechanism; the closed oil immersion overload unloading double speed transmission mechanism integrates a 2K-H displacement and variable level differential transmission shaft with multiple tooth differences and short teeth, a stopping output wheel shaft with an eccentric bushing hammer; the compact central locking electric switch machine which can not be squeezed, a lengthened rail brace slide plate ( base rail / switch tie) central multi-lug insulation hinge, a crank and straight linked arm and a linked switch rail and point rail form an industry and electricity integrated squeezable and non-squeezable unit by means of a zero-clearance sleeved elasticity group pin and a double-port microgap hinge, low speed turnout unitization of single opening and single action, double slip separated action, hump double action and the like is achieved, a intermediate speed and high speed turnout switch rail and a point rail are synchronous in sections and combined with combination unitization to form the safe, reliable, advanced, adjustment-free, protection-free and industry and electricity assembled power-driven turnout of the whole transmission and whole spreading central locking electrode control device.

The present invention relates to a carbon fiber reinforced alumina ceramic composite material and a preparation method thereof. The preparation method comprises: S101: carrying out vacuum impregnation on a carbon felt by using an aluminum sol as a precursor, and carrying out densifying treatment on the obtained carbon felt to prepare a carbon fiber reinforced alumina ceramic; and S102: carrying out vacuum impregnation on the carbon fiber reinforced alumina ceramic by using a sol-gel method, drying, sintering, and cooling to a room temperature to prepare a Si-Al-C coating. According to the present invention, the preparation method has advantages of short preparation period and low cost; and the prepared carbon fiber reinforced alumina ceramic composite material has advantages of excellent mechanical property and excellent high-temperature resistance.

The invention discloses a power transmission line carbon fiber composite core lead core rod, and belongs to the technical field of power transmission line leads. The power transmission line carbon fiber composite core lead core rod is prepared from the following raw materials in parts by weight: 30-40 parts of modified carbon fibers, 12-20 parts of glass fibers, 6-12 parts of polyester fibers, 8-15 parts of silicon nitride, 20-28 parts of polyurethane resin, 205-210 parts of xylene, 15-22 parts of epoxy resin, 5.5-10 parts of curing agent and 1.2-2 parts of surfactant. The surface of the corerod is round, clean and smooth and consistent in color and luster without defect, the tensile strength is over 2663MPa and the elastic modulus is over 130GPa. The core rod can be wound on a 55D-diameter cylinder at a winding speed of not more than 3r / min for one circle and the core rod does not crack or break, the withstand pressure of not less than 30KN in the radial pressure resistance test andthe end part does not crack or peel. The tensile strength of the surface layer is over 2511MPa after the torsion test for 360 degrees, and the surface layer does not crack.

The invention discloses a ceramic core for silica sol precision casting and a manufacturing process thereof. Components of the ceramic core comprise quartz glass powder, zircon powder, white fused alumina powder and a proper amount of collapsing agent; and at the same time reasonable manufacturing processes such as mixing, core making and roasting are adopted. In the ceramic core for casting, the unique components and manufacturing processes are adopted, particularly the proper amount of collapsing agent added in the ingredients greatly improves the collapsibility of the ceramic core after casting, as is determined after a large number of experiments, and the high-quality high-temperature resistant material in the ingredients enables the core to resist the erosion of high-temperature molten metals.

The invention relates to a preparation method of an ultra-large type composite carbon fiber tube. The preparation method of the ultra-large type composite carbon fiber tube is characterized by comprising the following steps that firstly, a mold is manufactured, a mold framework is formed by splicing metal frameworks, a mold skin is fixed to the mold framework, and the outer surface of the mold skin is coated with a mold release agent; secondly, carbon fiber fabric is laid on the outer surface of the mold skin; and thirdly, after standing and solidifying, demolding treatment is conducted.

The invention relates to a device for measuring thickness of a rubber-coated steel cord. The device comprises a dial gauge thickness measuring instrument consisting of a gauge frame, a counter weight, a measuring rod, a shifting fork, upper and lower measuring heads, a return spring, a gauge body, a pointer and a dial, wherein the gauge body is arranged on a supporting guide part of the gauge frame; the measuring rod passes through the gauge body and the supporting guide part; the top and bottom ends of the measuring rod are connected with the counter weight and the upper measuring head; the lower measuring head is arranged on a base of the gauge frame; two ends of the return spring in the gauge body are connected to the measuring rod and the gauge body; the shifting fork hinged on a hinge part of the gauge frame is connected to the measuring rod; and the measuring rod changes linear displacement into angular displacement of the pointer through a transmission piece so as to indicate the thickness value on the dial. The device is characterized by also comprising a measuring platform, wherein the base of the gauge frame is embedded in the platform; and an upper surface of the lower measuring head and an upper surface of the measuring platform are positioned on the same plane. The samples to be tested can be flatly put on the measuring platform and are accurately introduced between the upper and lower measuring heads, sample rubber cannot generate creep deformation, and the device is accurate in measurement and easy and convenient to operate.

A filter screen includes a plate body with an upstream surface, an opposed downstream surface, and an array of apertures extending between the upstream surface and the downstream surface. A polytetrafluoroethylene-based layer overlays the upstream surface between apertures of the aperture array, the polytetrafluorethylene-based layer being conformally disposed over the upstream surface of the plate body and spanning the upstream surface between the apertures of the aperture array to slow deposition of carbonaceous deposits on the filter screen.

The invention discloses a high-compressive hydraulic cylinder and belongs to the technical field of sealing application in wind generator brakes. The high-compressive hydraulic cylinder comprises a U-shaped cylinder body. The inner wall of the cylinder body is provided with a bottom guide circular groove, a seal ring groove and a dust ring groove from bottom to top. A guide ring is embedded into the bottom guide circular groove. A seal ring is embedded into the seal ring groove. The seal ring is a Simrit seal ring. A second seal ring groove is arranged between the seal ring groove and the dust ring groove. A second seal ring is embedded into the second seal ring groove. Hydraulic pressure in the cylinder body drives, from the lower portion of the Simrit seal ring, the Simrit seal ring to form hermetic fit with the surface of a piston; when the hydraulic pressure breaks through the Simrit seal ring, the inverted-V-shaped structure of the second seal ring blocks the hydraulic pressure, drives the hydraulic pressure to react on the upper portion of the Simrit seal ring and downwardly drives the Simrit seal ring, and under the action of upper and lower hydraulic pressures, the Simrit seal ring forms a stable seal structure.

An electrochemical immunosensor, a preparation method and application thereof belong to the technical field of electrochemical immunosensors. In order to solve the problems of poor specificity, low sensitivity, long detection cycle and impossibility of in-situ online detection and monitoring of aflatoxin B1, the invention provides an electrochemical immunosensor, a preparation method and application thereof. The preparation method of the electrochemical immunosensor comprises the following steps of (1) preparing carbon fibers and gold nanoparticles modified gold electrodes; (2) immobilizing aflatoxin antibodies; and (3) blocking non-specific binding sites by BSA to obtain a standard curve, wherein y=0.1296+0.03774x, the linear correlation coefficient R2=0.98858, and the linear detection range of the curve is 0.01-1000ng / mL. The sensor provided by the invention can measure the content of aflatoxin B1 at a small range of voltage of about 0.11V or at an exact voltage.

The invention belongs to the technical field of material property testing, and particularly relates to a carbon fiber multifilament compression strength sample preparation and test method. According to the method, a prepared carbon fiber multifilament rod is smooth and uniform in appearance, the diameter and the resin content of a test sample can be designed, and the method can be used for compression performance sample preparation of various types of carbon fibers; the compression test process is easy to operate, the mechanical properties of the fibers can be objectively evaluated through a compression test result, and the discrete value is small. The sample preparation and test method has important application and popularization prospects in the development and production of domestic high-performance carbon fibers and composite materials thereof.

The invention relates to the technical field of building materials, in particular to a material formula of an inorganic fireproof core layer. The material formula of the inorganic fireproof core layer comprises, by weight, 5%-15% of silicon dioxide, 5%-15% of magnesium oxide, 5%-15% of magnesium chloride, 25%-35% of flyash, 15%-25% of saw dust , 5%-10% of carbon fibers, 5%-10% of loess powder and 5%-15% of curing agents. The inorganic fireproof core layer prepared through the material formula is high in fireproof and water resistant capacity, the used materials can realize waste utilization, and the purposes of being green and environmentally friendly are achieved.

The invention discloses a Chinese wolfberry picking vehicle and belongs to the field of berry picking equipment. The Chinese wolfberry picking vehicle includes a vehicle body, a vibration picking assembly, a conveyor belt, a screening and weighing mechanism and a fruit frame lifting mechanism; the vehicle body includes a cab, a frame, four wheels, a platform and a power system, wherein the cab andthe power system are all fixed to the platform, the cab is located on one side of the power system and is connected with the four wheels through the power system, the frame is fixed under the platform, and the four wheels are all fixedly connected with the platform through the frame; the vibration picking assembly is located below the platform, is located inside the frame, and is fixed to the bottom surface of the platform; the conveyor belt is slide-shaped and is fixedly connected with the platform. The Chinese wolfberry picking vehicle can realize picking, sorting, weighing and storage of fruits, the picking process is continuous, the picking efficiency is high, and the damage to fruit trees is less.

The invention relates to a Moebius vibration isolator based on a wave mode conversion mechanism and an energy local effect. The Moebius vibration isolator is formed by combining multiple Moebius banded structures, and the multiple Moebius banded structures are connected into an integral structure through an upper part bearing force platform and a lower part bearing force platform; and the upper part bearing force platform and the lower part bearing force platform are respectively connected with upper part inclined plane regions and lower part circular arc regions of the Moebius banded structures. The Moebius vibration isolator provided by the invention couples the bending rigidity and torsional rigidity of the Moebius banded structures, the energy local region property is taken as an vibration isolation structure of a vibration isolation mechanism, and the Moebius vibration isolator has the advantages of large load-carrying ability, small static transformation, low inherent frequency, higher damping, and is capable of realizing low-frequency broad band transfer admittance and can not generate creepage, aging and temperature sensibility and the like.

The invention discloses a hydrogen fluoride adsorbent, which comprises the following raw materials: polyacrylonitrile, and one or more of alkali metal fluoride, alkaline earth metal fluoride and alkali metal fluorine-hydrogen compound. The invention also discloses a preparation method and application of the hydrogen fluoride adsorbent. The treatment mode of hydrogen fluoride in the lithium hexafluorophosphate production process is improved through the novel adsorbent, hydrogen fluoride in waste gas is recycled as much as possible and used for upstream section production, energy is saved, cost is reduced, and benefits are improved.