31results about How to "Strength meets" patented technology

The invention discloses a rotor blade structure capable of inhibiting the rotation chattering of a tilt rotor, belonging to the technical field of tilt rotors. The rotor blade structure comprises a blade girder, a skin and a filler core; on the basis that the position of the girder, the wing shape of the blade and the torsion angle are maintained not to be changed, middle chord lines on all cross sections are bended upwards by a certain angle at the part which is a certain distance away from a front edge point from some radial position of a blade to the tip; meanwhile, the skin and the filler are bended upwards by the same angle; the lengths of the bended parts are linearly increased along with the increment of the radial position. After the rotor blade structure is used, the shearing gas power in a rotor wing shimmy surface can be effectively reduced, and the system damping is improved, so that the rotor blade structure has a good effect of inhibiting the rotation chattering and is capable of effectively accelerating the speed of the rotation chattering. The structure meets the basic performance requirement of the rotor blade structure of the tilt rotor and is simple in structure, and the weight of the blade is not increased.

The invention provides a foam concrete sandwich color wall steel plate and a production technique thereof. The foam concrete sandwich color wall steel plate comprises a first steel plate layer, a second steel plate layer, a cement paste layer, a first foam concrete layer and a second foam concrete layer, wherein the first steel plate layer and the second steel plate layer are parallel; the cement paste layer is located between the first steel plate layer and the second steel plate layer; the space between the first steel plate layer and the cement paste layer is filled with the first foam concrete layer; and the space between the second steel plate layer and the cement paste layer is filled with the second foam concrete layer. The production technique comprises the steps of die-filling, pouring, die disassembling, combining, forming and the like. The foam concrete layers are adopted as a sandwich material and are not prone to combustion, and compared with traditional sandwich materials, the foam concrete layers are relatively hard and not prone to aging, the fracture resistance is relatively good, and the service life is relatively long. In addition, the foam concrete layers and the cement paste layer are used as the sandwich material, the effect that the sandwich color wall steel plate has the strength as traditional EPS composite wallboards is ensured, and no toxic gas is emitted at high temperatures.

The invention relates to a light emitting module and a light emitting keyboard. The light emitting module comprises a circuit board, a light emitting unit, a transparent glue layer, a light guide plate, and a reflective layer. The light emitting unit is arranged on the circuit board, and has a light-out surface used to emit light. The transparent glue layer has a first gluing part and a second gluing part, the first gluing part has a first side and a second side which face each other, the second gluing part has a third side and a fourth side which face each other, the first side of the first gluing part is arranged on the circuit board, and the third side of the second gluing part is adhered to the light-out surface of the light emitting unit. The light guide plate has a light-in surface used to receive light transmitted via the second gluing part. The light-in surface faces the light-out surface of the light emitting unit, and the light-in surface of the light guide plate is adhered to the fourth side of the second gluing part. The reflective layer is arranged under the light guide plate, and the bottom side of the reflective layer is adhered to the second side of the first gluing part. The light-in surface of the light guide plate and the light-out surface of the light emitting unit are connected by the second gluing part, and therefore, the phenomenon of halo can be avoided.

The invention belongs to the technical field of low-temperature natural gas liquefaction, and relates to LNG (liquefied natural gas) secondary low-temperature liquefaction equipment and the technique of refrigeration by mixed refrigerant. C2H4 refrigerant and N2-CH4 mixed refrigerant steam of 0.3MPa and -130 DEG C from an LNG three-level outlet are used for cooling and liquefying natural gas of 5.8MPa and -53 DEG C in a three-stream spiral wound type heat exchanger, so that LNG can conveniently enter a three-level undercooling stage. The three-stream spiral wound type heat exchanger for secondary liquefaction is used for undercooling the C2H4 refrigerant first, the undercooled C2H4 refrigerant is throttled to a shell side to be mixed with the N2-CH4 to cool a -53-DEG C LNG pipeline, a N2-CH4 precooling tube bundle and a C2H4 undercooling tube bundle, so that undercooling of the C2H4 and precooling of the N2-CH4 and liquefaction of natural gas are realized. The equipment is compact in structure and high in heat exchange efficiency, and can be used for the field of phase-variable low-temperature heat exchange of gas at temperature ranging from -53 DEG C to -120 DEG C, the problem of LNG secondary low-temperature liquefaction is solved, and low-temperature heat exchanging efficiency of an LNG system can be improved.

The invention discloses a composite aluminum rim and a manufacturing method thereof. The composite aluminum rim comprises a left ring body molded by punching, a right ring body molded by die casting and a web plate; a connecting part molded by rolling is arranged in the right ring body; each of the two abutting ends of the connecting part is provided with a plurality of rectangular notches, and rectangular convex blocks adapted to the corresponding rectangular notches; a rectangular sawtooth is formed between every two adjacent rectangular notches; a rectangular groove is formed between every two adjacent rectangular convex blocks; the connecting part comprises an embedded section connected with the right ring body, and a welding section welded with the left ring body; when the right ring body and the web plate are subjected to die-casting molding, the connecting part is connected with a mould core of a die-casting molding mould in a sleeving manner, so that an adjustment gap is formed between the end of each rectangular convex block and the bottom of one corresponding rectangular notch, and an adjustment gap is formed between the end of each rectangular sawtooth and the bottom of one corresponding rectangular groove; and reinforced connecting blocks are formed in the adjustment gaps. With the adoption of the scheme, the intensity of the composite aluminum rim can be guaranteed, the production efficiency can be improved and thus the manufacturing cost is reduced, the quality grade of the composite aluminum rim can be raised effectively, and the composite aluminum rim meets the requirements of a high-quality vehicle.

The invention discloses steaming-free foam concrete, a production method of steaming-free foam concrete building blocks and dedicated cutting equipment. The steaming-free foam concrete comprises, by weight, 150 parts to 400 parts of cement, 20 parts to 200 parts of mixed materials, 50 parts to 300 parts of water, 15 parts to 50 parts of regulators and five parts to 15 parts of foaming agents. The strength of the building blocks can be improved fast and is large, and above all, the heat preservation, heat insulation and water prevention performance is good, investment cost is low, production efficiency is high, and cutting efficiency is high.

The invention relates to degradable starch-based plastic masterbatch and a preparation method thereof. The degradable starch-based plastic masterbatch is prepared from the following raw materials in part by weight: 40 to 70 parts of starch, 10 to 20 parts of light calcium carbonate, 2 to 10 parts of fine aggregate, 13 to 25 parts of plastic materials, 1 to 5 parts of compatilizer, 1 to 5 parts oflubricant, 1 to 5 parts of modifier and 1 to 5 parts of degradation promoter. The light calcium carbonate and the fine aggregate are added into the degradable starch-based plastic masterbatch, so that the use level of synthetic polymers is reduced greatly; and through the preparation under the reasonable process condition, the quality of products is improved, and the cost is reduced by 45 percenton the premise of ensuring the degradation effect.