43results about How to "Improved damping performance" patented technology

The invention belongs to the field of street lamps, the invention relates to a buffer-type safe anti-collision street lamp. The street lamp comprises a rod body and a protective shell, an annular damping plate is fixedly mounted at the upper end of the protective shell, the lower end of the rod body penetrates through the annular damping plate and extends into the protective shell, the side wallsof the two sides of the rod body are movably connected with the inner side wall of the protective shell through two pressing plates, the rod body and the protective shell are fixed through a pressurespring, a damping box is slidably connected to the inner bottom face of the protective shell, a lifting plate is slidably connected to the inner side wall of the damping box in a sealed mode, a vent hole is formed in the lifting plate, a flow limiting valve is arranged in the vent hole, the lower end of the rod body is fixedly connected with the lifting plate, and the lifting plate is fixedly connected with the inner bottom face of the damping box through a supporting spring. When a vehicle collides with the rod body, a good damping effect is achieved, the possibility that the rod body is bentdue to vehicle collision is greatly reduced, and further deterioration of traffic accidents is avoided.

An EPDM composition for a torsional damper. The EPDM composition is made of (a) an EPDM polymer, (b) liquid polyolefin oligomer, and (c) carbon black, the EPDM composition containing 100 parts by weight of EPDM polymer that is the EPDM polymer of (a) having a propylene content of 35 to 50 wt % in the total amount of ethylene and propylene, 5 to 30 parts by weight of liquid polyolefin oligomer that is the liquid polyolefin oligomer of (b) having a number average molecular weight Mn within a range of 3,000 to 4,000, and 10 to 120 parts by weight of carbon black that is the carbon black of (c) having a nitrogen adsorption specific surface area within a range of 100 to 150 m2 / g, an iodine adsorption within a range of 110 to 160 mg / g, and a DBP oil absorption within a range of 70 to 135 cm3 / 100 g.

The invention discloses a lightweight vibration-isolating metal composite flywheel bracket, a preparation method and application thereof, and belongs to the technical field of metal material structure design and processing. The metal composite flywheel bracket includes a magnesium alloy base plate with light weight and high damping performance, a titanium alloy lattice sandwich flywheel mounting surface with vibration damping function, and a titanium alloy support beam with high rigidity; 3D printing combined method to fabricate lightweight vibration-isolating metal-composite flywheel brackets. The light-weight vibration-isolating metal composite flywheel bracket and the preparation method of the present invention have the advantages of small weight, high first-order vibration frequency, small magnification of the installation surface, wide applicability, and excellent performance.

The invention provides a transformation strengthened cold-machined high-strength steel, a steel tube and a manufacturing method thereof. The steel comprises the following chemical components in percentages by weight: 0.11-0.17% of C, 0.1-0.5% of Si, 0.5-2.0% of Mn, 0.01-0.05% of Al, 0.001-0.01% of Ca, less than or equal to 0.015% of P, less than or equal to 0.003% of O, less than or equal to 0.005% of S, less than or equal to 0.004% of N, and the balance of Fe and inevitable impurities, and meanwhile, the following relationship is required to be satisfied: 0.3%<C*Mn+Cr+2Mo<1.1%. The cold-machined high-strength steel tube is prepared by a transformation strengthened and strain strengthened composite process, the yield strength of the steel tube reaches 890 MPa or above, the elongation is greater than or equal to 10%, the structure of the steel tube is deformation ferrite and tempered martensite, and damping performance is excellent.

The invention belongs to the field of composite materials, and specifically discloses a high-damping fiber-reinforced resin-based composite material and a preparation method thereof. The fiber-reinforced resin-based composite material includes a resin matrix, fibers and a three-dimensional nanostructure, wherein the three-dimensional nanostructure Located at the intersection interface between the resin matrix and the fiber, the three-dimensional nanostructure includes two-dimensional nanomaterials and one-dimensional nanomaterials; The directions are the same; the one-dimensional nanomaterial is grafted on the two-dimensional nanomaterial, and its direction is perpendicular to the fiber direction. The invention introduces a novel three-dimensional nanostructure at the interface between the fiber and the resin, which can not only improve the mechanical properties of the composite material, but also significantly enhance the damping and shock absorption performance, so that it has very broad application prospects in the fields of aerospace, transportation and the like.

The invention discloses a planetary gearbox for a hydraulic tong, comprising a box assembly, an input shaft, an output shaft, a first planetary gear train, a second planetary gear train and a connecting frame mounted on the box body assembly , low-speed gear clutch and high-speed gear clutch, the box assembly includes an upper end cover fixedly connected, a main box body and a lower end cover; the main box body is provided with a circle of annular protrusions and a radial grease injection hole, and the annular protrusions are located on the main In the middle of the inner wall of the box, the grease injection hole includes a grease injection end and a grease output end, and the grease output end is located in the middle of the inner wall of the annular protrusion; by adopting grease lubrication, the gearbox has a higher carrying capacity and better At the same time, the grease can form a grease ring with a certain sealing effect, which is conducive to the use in the humid and dusty environment of oil drilling; thus ensuring that the dry pneumatic friction clutch can be used in the harsh working conditions of oil drilling in normal use.

The invention discloses a method for manufacturing a high-porosity through-hole porous aluminum alloy. First, the aluminum alloy is heated to melt, and the temperature of the aluminum alloy melt is kept at 660°C to 750°C. Keep warm at ℃~660℃ until the temperature of the filler particles is uniform, and the balance accounts for 5%~20% of the theoretical aluminum alloy casting amount, then place the mold on the suction cup base of the negative pressure device, and then cast the aluminum alloy melt after heat preservation into the mold, and connect the mold to a negative pressure device with a pressure of -2KPa to -40KPa. After the aluminum alloy is solidified, take out the composite of filler particles and aluminum alloy, and remove the filler particles. The invention also discloses a high-porosity through-hole porous aluminum alloy, the porosity of which is 70%-95%. The invention also discloses a high-porosity through-hole porous aluminum alloy manufacturing device. The through hole of the 70%-95% porous aluminum alloy obtained by the invention reaches 20%-35%.

The invention belongs to the fields of building materials and construction technology. Light-weight concrete consists of a concrete base layer and waterproof surface layers, wherein the concrete base layer comprises the following components in parts by weight: 100 parts of cement, 0.1-10 parts of chrysotile fibers, 0.01-2 parts of water repellent, 10-30 parts of pulverized fuel ash, 0.1-6 parts of water reducer, 50-200 parts of water, and 1-20 parts of foaming agent or air entraining agent; the upper side and the lower side of the concrete base layer are coated with the waterproof surface layers which comprise the following components in parts by weight: 100 parts of penetrating type organosilicon waterproofing agent, 0.1-20 parts of nano TiO2, 0-2 parts of activity enhancer, 0.01-5 parts of dispersion stabilizer, and 50-200 parts of solvent. Correspondingly, the microporous structure of the foam concrete or air-entrained concrete is uniform, and the mechanical performance is improved.