30results about How to "Improve compression resistance" patented technology

The invention relates to a method for replacing the hoisting ropes of an elevator. By the method of the invention, the hoisting ropes (4) are replaced by first joining the old and new hoisting ropes (4a, 4b) together by their one ends by splicing the ends together around a common core strand (17), whereupon the new set (4b) of hoisting ropes is pulled into place by means of the old set (4a) of hoisting ropes.

The invention relates to the field of functional magnetic sealing composite materials, and in particular provides a high pressure-resistant magnetic rubber sealing composite material and a preparation method thereof, which is mainly characterized by nitrile rubber, neoprene and magnetic powder and reinforcement, Composition of vulcanization and protection system, mixed by internal mixer and vulcanized by vulcanizer, the magnetic rubber sealing composite material has excellent dynamic sealing and static sealing, good solvent resistance, high resistance to pressure change, relatively Good thermal stability, magnetic stability and other characteristics.

The invention discloses a preparation method of a polyaspartic acid complex, wherein the preparation method includes the steps: dissolving sodium hyaluronate in water, adjusting the pH value of the system to 5.8-6.4, adding carbodiimide and N-hydroxy succinimide successively in a stirring state, adding L-cysteine ethyl ester hydrochloride, and stirring to obtain a prefabricated material; and mixing polysuccinimide and a sodium hydroxide solution, adjusting the temperature, stirring, adjusting the pH value of the system to 4.8-5.5, adding the prefabricated material and phenylacrylamide, stirring, adding ethylene glycol diglycidyl ether, carrying out a reaction, precipitating with methanol, purifying, and carrying out vacuum drying to obtain the polyaspartic acid complex. The invention alsodiscloses the polyaspartic acid complex which is prepared by the preparation method of the polyaspartic acid complex. The invention also discloses an application of the polyaspartic acid complex. Thepolyaspartic acid complex has the advantages of excellent water absorption and release performance, high compressive strength, excellent thermal stability, remarkable prolonging of water retention time, and good soil improvement effect.

The invention discloses a flame-retardant insulation board which comprises a base layer, a frame layer, an adhesive layer, a waterproof layer, an insulation layer, an elastic buffer layer and an abrasion-resistant coating. The base layer is covered by the frame layer. The frame layer is composed of a plurality of workpieces which are arranged in parallel or in a staggered mode and form filling cavities. The filling cavities are filled with filler. The frame layer is covered by the adhesive layer. The adhesive layer is covered by the waterproof layer. The waterproof layer is covered by the insulation layer. The insulation layer is covered by the elastic buffer layer. The upper surface of the elastic buffer layer is coated with the abrasion-resistant coating made of abrasion-resistant paint.

The invention provides an oil gas torsion spring, and belongs to the field of springs. The oil gas torsion spring comprises a cylinder barrel, a torsion shaft, floating pistons and an end cover. A closed annular cavity is formed between the inner wall of the cylinder barrel and the outer wall of the torsion shaft. The annular cavity is divided by the first floating piston and the second floating piston into a gas chamber and an oil chamber, a fixed baffle fixedly connected to the inner wall of the cylinder barrel divides the gas chamber into a first gas chamber body and a second gas chamber body which are symmetric, a swinging arm fixedly connected to the torsion shaft divides the oil chamber into a first oil chamber body and a second oil chamber body which are symmetric, the oil chamber bodies are connected through damping holes, and hydraulic oil is led into the oil chamber. Inert gases are led into the gas chamber, and the end cover penetrates the torsion shaft to be fixedly connected with the cylinder barrel through a bolt. According to the oil gas torsion spring, the torsion rigidity and damping coefficient can be automatically adjusted, and accordingly, torsion vibration and torque can be effectively buffered and attenuated; and meanwhile, various sealing systems are internally coated with sealing layers, mutual oil and gas channeling can be effectively prevented, and therefore the oil gas torsion spring is efficient and universal.