37 results about "Geometric stability" patented technology

The invention discloses an EVA (Ethylene-Vinyl Acetate Copolymer) foaming and damping material and a preparation method thereof. The EVA foaming and damping material is prepared from the following components in parts by weight: 10-30 parts of EVA, 10-30 parts of NBR (Nitrile-Butadiene Rubber), 30-50 parts of PVC (Polyvinylchlorid), 10-20 parts of epoxidized soybean oil, 10-20 parts of calcium carbonate, 1-3 parts of foaming agent, 0.5-1 part of cross-linking agent, 0.5-1 part of barium stearate, 1-3 parts of zinc oxide, 10-15 parts of plasticizer and 0.5-1 part of accelerator. Compared with the prior art, the EVA foaming and damping material has the characteristics that nitrile-butadiene rubber added in a formula is high in oil resistance, easy in process operation and small in elasticity, so that a product has favorable damping performance. The polyvinylchloride has the advantages of non-flammablility, high strength, favorable weather resistance, excellent geometrical stability and endows excellent ageing resistance for the product. The added epoxidized soybean oil can be used as a lubricating agent for reducing the viscosity of the materials, improving the flowability of the materials and reducing the difficulty coefficient of process operation, is also a widely-used rubber softener and endows excellent softness for the product; and in addition, the epoxidized soybean oil is a PVC environment-friendly plasticizer and stabilizer, and thus the stability of the products is improved.

The invention relates to a gob-side entry retaining roadside support system and a construction method thereof. A rhombic steel bar net is arranged on one side of a gob, an air drum cloth is laid on the inner side of the rhombic steel bar net, light aggregate concrete is adopted to perform guniting treatment on the air drum cloth and the rhombic steel bar net, a windtight light aggregate concrete spray layer is formed on the side of the gob, the thickness of the light aggregate concrete spray layer is 200-500 mm, and the other side of the light aggregate concrete spray layer is close to a steel tube concrete pier stud supporting device. A steel tube concrete pier stud is formed by filling an empty steel tube with concrete; through a restraint effect of a steel tube casing, internal concrete is in a three-dimensional stressed state, the geometrical stability of the steel tube wall is enhanced, and the bearing capacity of the steel tube concrete pier stud is improved. According to the gob-side entry retaining roadside support system, a top plate can be supported in high strength, coal mining efficiency is effectively improved, and an operation environment in a roadway is improved; the steel tube concrete pier stud can be recycled through a special thrust device, and the roadway retained cost is reduced.

The diffusion beads according to the present invention have a core-shell structure of multi-layered beads consisting of organic and inorganic materials. The diffusion beads are used for improving functions of conventional organic and inorganic polymer diffusion beads. The structure according to the present invention no only enhances light scattering characteristics of the diffusion beads, but also strengthens the thermal stability and geometric stability thereof.

A reinforcement means for moulded and extruded articles such as tires has a metal structure with a layer of silica gel bonded thereto. The silica gel bonds the reinforcement means to the rubber compound during the moulding / vulcanisation of the rubber compound without the need for a slow curing stage. The silica gel may be applied to the metal structure by a sol-gel process with the gel formed by drying the sol at a temperature up to 150 DEG C. The reinforcement means is preferably a cable formed from steel wires coated with the silica gel. To further improve bonding of the silica gel to the rubber compound, an organosilane bonding agent may be included in the rubber compound or the reinforcing means provided with a second layer comprising an organosilane as a bonding agent. The reinforcement means are particularly useful for strengthening and providing geometric stability to tires.

The present invention relates to zinc electrode and to methods of producing zinc electrode and particularly to a method of producing zinc electrode providing dimensional / geometrical stability during a battery charge / discharge operation. The invention provides methods of use of batteries comprising the zinc electrode of this invention. Applications of batteries of this invention include electric vehicles, portable electronics and drones.

The invention discloses a spring-driven space deployable annular antenna device. The spring-driven space deployable annular antenna device comprises n sets of triangular deployable assemblies and an equilateral right triangle deployable unit A; the equilateral right triangle deployable unit A is composed of n sets of triangular deployable cooperative assemblies connected below the n sets of adjacent triangular deployable assemblies; n is greater than or equal to 2; the n sets of triangular deployable assemblies are connected end to end through four-head hinges; the n sets of triangular deployable cooperative assemblies and the n sets of triangular deployable assemblies share the same set of transverse rods connected through the four-head hinges; the n sets of triangular deployable assemblies and the n sets of triangular deployable cooperative assemblies are connected end to end; and, under the action of the elasticity of a spring, folding or unfolding is carried out, so that the deployable annular antenna device is formed. The device has relatively high geometric stability; a motion mechanism and a control system are simple; after being folded, the device is small in volume and high in accepting rate; an active driving device is unnecessary; the module extensibility is high; accessories are simple; and use requirements of large-aperture space antennas, such as communication satellites and space exploration, can be satisfied.

The invention discloses a multi-faceted cascadable steering gear with a center output shaft with position feedback, comprising a steering gear main body and a motor, the steering gear main body includes a top shell, a gear shell and a lower shell, and the lower shell is provided with a bottom shell The connection port, the motor is set and fixed in the gear housing, the center of the gear housing is provided with an output shaft, the output shaft is provided with a reduction gear set, and the gear housing is also provided with a rotation sensor interlocking with the reduction gear set, the top of the output shaft is connected to There is an output shaft connector, and the center of the output shaft connector and the connection port of the bottom shell is provided with a connection groove of the same size. It can be cascaded with the side of the next steering gear through an angle connector, with simple structure and good geometric stability.