31results about How to "Improve axial tensile strength" patented technology

An arrangement method of the continuous axial fiber and the special device is about the fiber which winds the glass steel tube. In the process of the glass steel tube, the continuous axial fibrous zone is arranged out of the pipe except the toroidal fiber, so the tension direction of the fiber is same as the axial stress of the pipe instead of the reciprocal cross winding, so it can solve the problem of the axial low strength of the pipe and it improves the production efficient by the special production device.

The invention relates to a composite winding thermoplastic glass steel pipe and its preparation method. The pipe is composed of an inner layer, a middle layer and an outer layer, wherein the inner layer is a continuous glass fiber reinforced thermoplastic prepreg tape layer wound in a hoop direction, and the middle layer is a spiral Winding continuous glass fiber reinforced thermoplastic prepreg tape layer, the outer layer is hoop wound continuous glass fiber reinforced thermoplastic resin prepreg tape layer. Compared with the prior art, the present invention not only has a higher hoop tensile strength, but also has a higher axial tensile strength, which can meet the requirements for pulling pipes in trenchless construction; the composite winding of the present invention During the winding process of thermoplastic FRP pipes, it is only necessary to adjust the winding process and change the winding angle, without changing the bandwidth of the continuous fiber reinforced thermoplastic resin composite material prepreg tape. The entire winding process is continuous and the production efficiency is high.

The invention discloses a stainless steel corrugated hose connecting device for fuel gas transportation. The stainless steel corrugated hose connecting device for the fuel gas transportation comprises a corrugated hose and a plastic protective sleeve which is arranged on the corrugated hose in a sleeved mode. A plurality of gas-guiding grooves are evenly formed in the plastic protective sleeve. A straight through seat is arranged outside the plastic protective sleeve in a sleeved mode. A sealing ring is arranged between one end of the straight through seat and the plastic protective sleeve. Threads are formed in an inner circle of the other end of the straight through seat. A tool withdrawal groove is formed at the bottom of the threads. Four concave grooves are formed in the threads. A clamping ring is arranged on one side of the tool withdrawal groove, wherein the clamping ring is a metal ring which is divided into two pieces. A ditch groove is formed in an inner circle of the clamping ring. The ditch groove is matched with the corrugated appearance of the corrugated hose. Four bosses are arranged on an outer circle of the clamping ring. The bosses enter the tool withdrawal groove of the bottom of the threads through the four concave grooves, located at the place of the threads, of the straight through seat. A sealing mat is arranged on one side of the clamping ring. The stainless steel corrugated hose connecting device for the fuel gas transportation has the advantages of being convenient to install, high in axial tensile strength and good in sealing property. The stainless steel corrugated hose connecting device for the fuel gas transportation saves inner space and enables a corrugated hose with a larger outer diameter to be capable of adopting standard pipe threads.

The invention discloses a reversible repair functional matrix resin for pultrusion and a preparation method of the matrix resin. The matrix resin is prepared from the following raw materials in parts by weight: 30-60 parts of 4,4'-diallylbisphenol A diglycidyl ether epoxy resin, 20-35 parts of furfuryl amine, 15-30 parts of 4,4'-bismaleimide diphenylmethane, 0-25 parts of liquid epoxy resin and 5-15 parts of curing agent. The preparation method comprises the following steps: dissolving the 4,4'-diallylbisphenol A diglycidyl ether epoxy resin in a formula amount into a solvent, slowly adding the furfuryl amine into a reaction container for reacting, adding the 4,4'-bismaleimide diphenylmethane, liquid epoxy resin and curing agent, reacting and mixing for a hour, performing reduced pressure distillation to remove the solvent, and cooling. The reversible repair functional matrix resin for pultrusion and the preparation method of the matrix resin disclosed by the invention have the beneficial effects that the matrix resin has good molding manufacturability, the molecular structure contains furan and imide structures, the heating and repairing functions of the prepared composite material can be realized by virtue of a Diels-Alder reversible reaction, and the matrix resin also has the advantages of high strength and high heat resistance.

The invention provides a large-size aluminum-steel reaction-assisted heat-toughened friction welding method, which includes designing a bidirectional fitting structure for the welded joint of an aluminum member (20) and a steel member (10) and setting a welding auxiliary layer at the welded joint ; The design of the two-way fitting structure is specifically: on the surface of the steel member (10) to be welded, an annular steel inner groove (11), an annular steel boss (12) and an annular steel outer groove are sequentially processed outward from the central axis. Groove (13), an annular aluminum groove (21) is processed on the surface to be welded of the aluminum member; the welding auxiliary layer includes a reaction transition layer (51), a strengthening and toughening layer (52) and a reaction auxiliary heating layer (53) . This method effectively solves the problems that a large amount of brittle intermetallic compounds are easily generated during the welding process of steel components and aluminum components, the stress of the joint after welding is large, the strength of the welded joint is low, and the toughness is poor, and the friction welding between large-sized aluminum and steel components is realized. High welding efficiency and good welding quality.