23 results about "Flexural fatigue" patented technology

The invention discloses a composite enhanced high-thermal-conductivity cable, and the cable comprises a conductor layer which is composed of a metal-based composite conductor material; the insulating layer is coated outside the conductor layer and is made of a high-thermal-conductivity insulating composite material; the shielding reinforcing layer is coated outside the insulating layer and is formed by weaving a fiber-conductive composite material; and the sheath layer is coated at the outermost part. A three-dimensional heat dissipation channel from inside to outside is constructed through the graphene composite conductor and the boron nitride composite insulating layer, efficient cooperative heat dissipation is achieved, compared with a traditional cable, the high heat conduction effect is achieved, the current-carrying capacity is remarkably improved, and insulation aging is delayed; meanwhile, the shielding enhancement layer enables the cable to have the characteristics of high tensile strength and bending fatigue resistance while keeping light weight; and the heat insulation buffer layer is matched with the sheath layer, so that the cable is endowed with excellent environmental adaptability, and the technical contradiction that multiple properties such as high conductivity and high heat conductivity, high strength and light weight are difficult to consider at the same time is systematically solved.

Provided are a cellulose fiber-containing resin molded body excellent in flexural fatigue resistance and a cellulose fiber-containing resin composite suitable for obtaining this molded body. 【Solution means】A cellulose fiber-containing resin composite and a cellulose fiber-containing resin molded body, which contain polypropylene resin (PP) and cellulose fiber (CF) and satisfy the following condition 1 or 2. - Condition 1 - The average fiber diameter of CF is 5 to 15 μm, the average fiber length is more than 35 μm and 130 μm or less, and when the ratio of CF in the total amount of PP and CF is Xa mass% and the ratio of soft PP in PP is Ya mass%, inequality A is satisfied. Inequality A: Ya ≥ Xa × 2.5 Xa > 0, Ya > 0 - Condition 2 - The average fiber diameter of CF is 5 to 10 μm, the average fiber length is 35 μm or less, and when the ratio of CF in the total amount of PP and CF is Xb mass% and the ratio of soft PP in PP is Yb mass%, inequality B is satisfied. Inequality B: Yb ≥ Xb × 2.5 - 25 Xb > 0, Yb > 0

The application provides a high-toughness mechanically adaptive bone screw and a preparation method thereof, relates to the technical field of orthopedic implant medical devices, and comprises the following steps: preparing a carbon fiber-polyether ether ketone core mold; preparing a variable-thickness carbon fiber-polyether ether ketone prepreg; conveying the variable-thickness carbon fiber-polyether ether ketone prepreg and an organic film after heat sealing to the surface of the carbon fiber-polyether ether ketone core mold, and layer by layer laying on the carbon fiber-polyether ether ketone core mold to be compacted, molded and prepared into a preform; heating the preform to a specified temperature, extruding and molding through a screw structure mold, and then demolding and heat treating to prepare the bone screw. The application uses the organic film as a toughening layer and designs a coaxial laminated structure, the thickness gradually decreases from the central cylinder to the outer peripheral layer of the screw body, the performance in the aspects of bending fatigue performance and fracture toughness is obviously improved, the relative modulus is significantly lower than that of the bone screw prepared by a traditional scheme, and is closer to the modulus of cortical bone, thereby reflecting the advantages in mechanical adaptation.

This invention relates to the field of polymer materials technology, and discloses a high-elasticity rubber-plastic insulated cable composite material and its preparation method. The high-elasticity rubber-plastic insulation material comprises, by weight, 40-50 parts of EPDM rubber, 20-25 parts of polyolefin elastomer, 30-35 parts of modified calcined kaolin, 3-5 parts of composite antioxidant, 2-3 parts of silane coupling agent, and 1.5-2 parts of vulcanizing agent. During preparation, EPDM rubber and polyolefin elastomer are kneaded for 5-8 minutes, then modified calcined kaolin and silane coupling agent are added and kneaded for another 8-12 minutes, followed by the addition of composite antioxidant and vulcanizing agent and kneading for 3-5 minutes. Finally, the mixture is vulcanized in stages. The first stage vulcanization temperature is 155-160℃, and the second stage vulcanization temperature is 165-170℃. The insulating material prepared by this invention has excellent elasticity, outstanding resistance to flexural fatigue, stable insulation performance, high volume resistivity, excellent aging resistance, and tight interfacial bonding. It is suitable for use in high-voltage cable insulation layers, effectively extending the service life and stability of the cable.

The invention relates to the technical field of high-voltage fast-charging cable manufacturing, in particular to a new energy high-voltage fast-charging flexible cable and a manufacturing system.The manufacturing system comprises a workbench, a wire spool and a limiting structure are sequentially arranged above the workbench, the wire spool rotates through a driving structure, and a mounting frame and a pay-off head are arranged on one side of the workbench; equipments such as an insulating layer co-extruder and a braiding machine are arranged on the other side; the cable is composed of a conductor layer, an insulating layer, a shielding layer and an outer sheath, the conductor layer is formed by stranding silver-plated copper wire harnesses in a layered mode, the insulating layer is made of nanometer modified TPU and ceramic powder composite materials, the shielding layer is of a double-layer structure, and the outer sheath is formed by co-extruding polyether type TPEE and carbon nano tube composite materials. According to the manufacturing system, copper wire twisting can be accurately controlled, layered twisting is achieved, proper pretension is applied, the wire twisting quality and the production efficiency are improved, manual intervention is reduced, and the equipment layout is reasonable; the prepared cable has the advantages of strong fast charging performance, long dynamic bending fatigue life, high safety performance, capability of passing a vertical combustion test, and strong environmental adaptability.

The utility model discloses a cloth clamping packaging paper bag which comprises a bag body, the bag body comprises a bag body and a bottom sealing structure, the bottom sealing structure is located below the bag body, the bag body is cylindrical, the upper end and the lower end of the bag body are open, and the bottom sealing structure is connected with the lower end of the bag body and blocks the lower end opening of the bag body. The bag body sequentially comprises a first paper layer, a first woven cloth layer and a second paper layer from inside to outside. The first woven cloth layer is PP cloth, is a semi-crystalline thermoplastic polymer prepared from propylene monomers through addition polymerization reaction, and has excellent mechanical properties including tensile strength, compression strength and hardness, and outstanding rigidity and bending fatigue resistance. The first woven cloth layer can enhance the pulling resistance of the bag body, so that the bag body is difficult to damage, and material leakage is avoided.

The present application relates to the technical field of cable preparation, and particularly relates to a preparation process of a robot cable, comprising the following steps: conductor stranding, extruding a shielding layer and a sheath layer outside the conductive wire core, and wrapping a cushion layer, an armor layer and an outer sheath outside the sheath layer, the present application combines metal wires, epoxy coating and aramid fibers, and the composite process brings multiple breakthrough advantages to the cable armor layer through ingenious material design and processing: the firm coating layer formed by the epoxy coating on the surface of the metal wire not only significantly improves the chemical corrosion resistance, but more importantly, in the subsequent heat curing process, the coating layer acts as an active molecular bridge, and the aramid fibers after surface activation form a firm overall network through chemical bonding and mechanical interlocking effect, so that the rigidity and strength of the metal wire and the toughness and impact resistance of the aramid fibers are perfectly coordinated, and the mechanical enhancement effect of synergistic effect is realized, and the tensile strength and repeated bending fatigue resistance are improved.

The invention discloses a salt-fog-resistant high-flexibility cable for a ship-borne energy storage system, and belongs to the technical field of special cables. The cable comprises a conductor, a conductor insulating layer, a sub-shielding layer, a filler, a total shielding layer, an inner sheath, a braided reinforcing layer and a salt-fog-resistant outer sheath from inside to outside, and has the core innovation points that firstly, the reinforcing layer braided by high-strength synthetic fibers is arranged between the inner sheath and the outer sheath, so that on the premise that the rigidity of the cable is not remarkably increased, the strength of the cable is greatly improved; the tensile property, the torsion resistance and the bending fatigue resistance of the cable are greatly improved; and secondly, the outer sheath is made of a special salt-mist-resistant composite elastomer material, and salt mist erosion is actively defended through a hydrophobic mechanism, a passivation mechanism and a vapor phase corrosion inhibition mechanism. And the conductors and the shielding layer are tinned to form a complete anti-corrosion system from inside to outside. The cable has excellent flexibility, salt spray corrosion resistance, electromagnetic shielding performance and flame retardance, and is especially suitable for frequent movement and vibration scenes of a ship energy storage system in a marine environment.

This invention discloses a flexural fatigue testing device and method for a flexible compensator in a fuel pipeline, comprising: an axial sliding rotary guide mechanism including two rotary support seats, one of which is slidably mounted on a mounting platform, and the other is fixedly mounted on the mounting platform; an axial compensation reciprocating drive platform assembly for driving the rotary support seat slidably mounted on the mounting platform to perform linear motion on the mounting platform; and an angle compensation reciprocating drive platform assembly including a tail flange, a front flange, and two rotary actuators, which are used to drive the tail flange and the front flange to rotate, respectively. This invention can achieve flexural fatigue testing of flexible compensators with simultaneous axial length compensation, unidirectional angle compensation, same-bidirectional angle compensation, or opposite-bidirectional angle compensation compensators; it is simple to operate, stable and reliable, with low processing and maintenance costs, and features high measurement accuracy, good stability, and convenient operation.

The invention discloses a super-wear-resistant, long-service-life, high-flexibility, light-weight and negative-pressure-resistant rubber refueling hose and a preparation method thereof. The invention discloses a super-wear-resistant, long-service-life, high-flexibility, light-weight and negative-pressure-resistant rubber refueling hose. The negative-pressure-resistant rubber refueling hose sequentially comprises an inner rubber layer, a spiral steel wire layer, a middle rubber layer, a fiber woven layer, an outer rubber layer, a transition layer and a wear-resistant protective layer from inside to outside. Or the inner rubber layer, the spiral steel wire layer, the middle rubber layer, the fiber woven layer, the outer rubber layer and the wear-resistant protective layer are sequentially arranged from inside to outside; the spiral steel wire layer is formed by spirally winding a steel wire; the fiber woven layer is formed by weaving one or more of aramid fibers, polyester fibers and vinylon fibers; and the wear-resistant protective layer is made of an ultra-high molecular weight polyethylene film. The negative-pressure-resistant rubber refueling hose meets the negative-pressure-resistant effect, meanwhile, the negative-pressure-resistant rubber refueling hose is lighter in weight, good in flexibility and excellent in wear resistance and bending fatigue performance, and the service life of the hose can be effectively prolonged.

The invention discloses cable bending fatigue life testing equipment, which comprises a mounting rack, and further comprises a test driving mechanism arranged in the mounting rack and used for driving the middle part of a cable to move; the end limiting mechanisms are mounted on the two sides of the test driving mechanism and used for limiting the two ends of the to-be-tested cable; the buffer extrusion assemblies are arranged in the mounting frame and located on the two sides of the test driving mechanism, hydraulic oil is arranged in the buffer extrusion assemblies, and movement of the test driving mechanism is buffered; the elastic pipe is communicated between the end limiting mechanism and the buffer extrusion assembly and is used for conveying hydraulic oil; according to the invention, through the arrangement of a hydraulic linkage structure of the buffer extrusion assembly and the end part limiting mechanism, the self-adaptive adjustment of the clamping force of the cable and the buffer protection of the test driving mechanism are realized.

The invention discloses a polypropylene staple fiber for an automobile wheel casing and a preparation method thereof, and belongs to the technical field of artificial filaments or analogues, the polypropylene staple fiber is prepared from polypropylene resin, an ethylene-propylene-diene terpolymer, maleic anhydride grafted polypropylene, an efficient plasticizer, an antioxidant, a light stabilizer, a nucleating agent and silicone master batch. Compared with the prior art, the high-efficiency plasticizer is introduced, and the elastomer is matched for toughening and interface compatibility improvement, so that the entanglement resistance of a polypropylene molecular chain is reduced, and meanwhile, the stress transfer is optimized, so that the energy dissipation is more uniform when the fiber is stressed or repeatedly bent; the repeated bending fatigue resistance of the fiber is remarkably improved while the fiber is endowed with high elongation at break, and the comprehensive requirements of the automobile wheel cover on the toughness and durability of the material are fully met.

The utility model relates to the technical field of cable structures, and provides a flexible cable, comprising conductors; the insulating layer coats the outer side of the conductor; the buffer layer is arranged on the outer wall of the insulating layer, the buffer layer and the insulating layer are integrally formed, the buffer layer comprises a plurality of buffer parts, the buffer parts are distributed in the circumferential direction of the outer wall of the insulating layer, and any buffer part faces at least part of the opposite side of the outer wall of the insulating layer so as to buffer the bent insulating layer; and the coating layer coats the outer side of the buffer layer and at least abuts against the end part of the buffer part. According to the utility model, through the arrangement of the buffer part, the flexibility and the bending fatigue resistance of the cable are significantly improved while the excellent flexibility of the cable is maintained, the bending life of the cable is greatly prolonged, the safety is higher, and the cable is especially suitable for high-end application scenarios such as robots requiring frequent bending.

This invention discloses a high-hardness, flexurally resistant organic-inorganic composite membrane, its preparation method, and its applications, belonging to the field of organic-inorganic composite material technology. This invention uses calcium phosphate oligomers as an inorganic precursor and bacterial cellulose as an organic precursor. Through organic and inorganic blending and filtration followed by hot pressing, the calcium phosphate oligomers are induced to polymerize in situ within the bacterial cellulose organic network, forming an inorganic network. This allows for the construction of an interpenetrating organic framework inorganic network at the nanoscale, and reversible interfacial bonding sites are formed through the electrostatic interaction between calcium ions and hydroxyl groups. The inorganic network provides rigid support, requiring a larger load to deform under external forces, thereby improving the membrane's stiffness and hardness. During cyclic loading, the interfacial bonding points between the organic and inorganic networks can break and reform, achieving stress dissipation and redistribution, thus improving the membrane's flexural fatigue life.

The present invention provides a rubber composition that can produce vulcanized products and vulcanized molded articles with excellent gas barrier properties, flexural fatigue resistance, and heat resistance. [Solution] According to the present invention, a rubber composition is provided which includes chloroprene rubber and butyl rubber, wherein the rubber composition contains 0.1 to 99 parts by mass of chloroprene rubber per 100 parts by mass of rubber contained in the rubber composition, and the chloroprene rubber contains chloroprene rubber containing unsaturated nitrile monomer units.

The invention relates to the technical field of power-on cables, and provides a cable production line which comprises a cable core preprocessing module, a cable core processing module and a cable forming module, the cable core preprocessing module is used for preliminarily processing wires, the cable core processing module is used for twisting the processed wires and forming a polyurethane coating on the surface of a twisted wire, and the cable forming module is used for forming a cable on the surface of the twisted wire. And the cable forming module is used for adding an insulating layer on the composite wire to form a final product. According to the technical scheme, the problem that only thinner conductor monofilaments can be selected for improving the flexibility of the existing cable is solved, and the uniform polyurethane elastic buffer layer is constructed on the surface of the cable conductor in situ, so that the flexibility of the cable is improved on the premise of ensuring the mechanical strength of the conductor. The bending fatigue resistant life, the interface adhesive force and the long-term use reliability of the cable are remarkably improved, and the core bottleneck of high-end flexible cable manufacturing is solved.

This invention relates to a method for predicting the flexural fatigue life of LSAM-50 considering the temperature-load coupling effect and fatigue limit constraints. Through a systematic innovation across the entire process from material forming, experimental design, data processing to model construction, it is the first to systematically introduce temperature variables and fatigue limit parameters into the flexural fatigue model. This enables an accurate description and quantitative prediction of the fatigue behavior of LSAM-50 under temperature-load coupling, effectively solving three major problems of existing models: failure to consider coupling effects, lack of fatigue limit characterization, and absence of a dedicated model for this ultra-large particle size material. This achievement can provide direct theoretical basis and key design parameters for the fatigue resistance design, life prediction, and integrated optimization of LSAM-50 and its pavement structures, thereby significantly improving the scientific rigor, reliability, and economy of long-life asphalt pavement design.

The invention provides a production process of a flexible electrothermal alloy ribbon. The production process comprises the following steps: S1, screening and proportioning raw materials; s2, smelting and solidifying cast ingots; s3, controlled rolling and controlled cooling hot rolling cogging; s4, precise cold rolling; s5, annealing treatment; s6, surface treatment; and S7, cutting and straightening. The electrothermal alloy ribbon produced by the technical scheme has high flexibility, high bending fatigue strength and excellent thermal cycling stability, is suitable for being applied to heat preservation scenes of batteries of new energy automobiles and the like, and can be attached to the surfaces of the batteries to uniformly provide heat.

The embodiment of the utility model provides a medical ultrasonic electrotome cable. The medical ultrasonic electrotome cable comprises an outer sheath, a core wire and a high polymer material wire, wherein the core wire and the high polymer material wire are arranged in the outer sheath; wherein the number of the high polymer material wires is greater than that of the core wires; the high polymer material wire and the core wire are spirally twisted; the core wire comprises an inner-layer center line, an outer-layer center line and an insulating layer; the periphery of the outer-layer center line is coated with the insulating layer, and the periphery of the inner-layer center line is coated with the outer-layer center line; the number of center lines of the inner layer is seven, and the number of center lines of the outer layer is twelve. The center line of the inner layer and the center line of the outer layer are symmetrically arranged along the center axis. According to the application, radial compression resistance and axial flexibility balance are realized through a core wire and high polymer material wire stranded structure; the bending fatigue life is prolonged through layered stranding of the conductor by the inner-layer center line and the outer-layer center line; the winding memorability is eliminated through the high-elasticity outer sheath, and the intraoperative wire arrangement efficiency is improved by more than 40%.

The application provides a super-flexible cable for a humanoid robot and a preparation method thereof, wherein the super-flexible cable for the humanoid robot comprises a core body, an insulation layer and a sheath, the core body comprises copper foil filaments and aramid fiber columns, and the copper foil filaments are spirally twisted around the aramid fiber columns; the insulation layer comprises modified aramid fibers, the modified aramid fibers are obtained by treating aramid fibers with a LiCl-polyvinylpyrrolidone solution, and then grafting the aramid fibers with a trimethoxysilane / 1,6-hexane diisocyanate toluene solution. The cable has excellent softness, is suitable for various complex, narrow installation spaces and frequent bending application scenarios, the addition of the modified aramid fibers and the optimized cabling structure significantly improve the tensile strength and bending fatigue resistance of the cable, and prolong the service life.

This invention discloses an ultrafine fatigue-resistant tungsten wire rope for medical use and its preparation method, belonging to the field of tungsten wire rope technology. The invention first prepares ultrafine tungsten alloy wires with a diameter of 0.013~0.028mm through steps such as air-flow mixing, wet grinding, pre-reduction, spray doping, and multi-stage sintering; then, the wires are twisted into "7×49" or "7×37" fully homogeneous tungsten wire ropes. Through synergistic innovation in materials and structure, this invention solves the problems of easy loosening, low fatigue life, and difficulty in preparing high-performance wires in existing heterogeneous structure wire ropes. It exhibits excellent anti-rotation properties, structural stability, and bending fatigue life, and the process is highly uniform, resulting in good mass production consistency.

This invention relates to the field of tire manufacturing technology, and more particularly to a low-heat-generating, high-elasticity sidewall rubber composition, a mixing method, and a tire. Based on 100 parts by weight of the rubber components, it includes natural rubber, first and second non-oil-extended polystyrene-butadiene rubbers (BF2055H / L), polybutadiene rubber, and additives such as highly dispersed silica, a small amount of carbon black, silane coupling agents, and α-methylstyrene resin. BF2055H / L has a 20% styrene content, 55% vinyl content, and a bimodal molecular weight distribution, synergistically improving the dynamic modulus distribution of the rubber and the uniformity of filler dispersion. This invention, through the synergistic reinforcement of the bimodal high-vinyl SSBR-NR-BR system and silica / carbon black, significantly reduces sidewall heat generation and rolling energy consumption while maintaining a comfort hardness of 56–58A, thereby improving dynamic strength and flexural fatigue life, thus meeting the comprehensive requirements of electric vehicle tires for long range, lightweight, and high reliability.

To provide continuous filament-based elongated bodies with improved durability and bending fatigue performance.SOLUTION: An elongated body is a multifilament ultra-high molecular weight polyolefin fiber in which at least one component fiber has a filament intrinsic viscosity (IVf) of 15 dl / g to about 45 dl / g when measured in decalin at 135°C. The at least one multifilament ultra-high molecular weight polyolefin fiber is formed from a plurality of fibers having a toughness of at least 32 g / denier, a denier of above 800 and a denier per filament of above 2.0. High toughness, combined with high fiber denier and high filament denier (dpf), enhances repeated bending on a tug (CBOS) when the elongated body is incorporated into a multi-fiber structure such as a rope.SELECTED DRAWING: Figure 1