Full steel framework enhanced plug type composite pipe and manufacture technology thereof

Abstract

The invention provides a full steel framework enhanced plug type composite pipe and a manufacture technology thereof. The composite pipe comprises a main framework semi-product and an auxiliary framework semi-product which are respectively manufactured through a casting or stamping process, an injection molding process and a plastic spraying process, wherein the end parts of the semi-products are connected with each other, so as to form a product; the outer layer of the main framework is a plug main pipe outer wall formed by combining a front large tapered wall and a rear cylindrical wall with a middle small tapered wall; the plug main pipe inner wall comprises a plug cavity and a flow cavity; and a group of grooves are formed in the inner cavity of the main framework. Through the adoption of the technical scheme, the composite pipe has the advantages that the separation caused during the connection of conventional composite pipes due to different thermal expansion coefficients is avoided, so as not to enlarge the non roundness of the joints; fast stress crack, which is caused easily during welding, is reduced; the butting quality is guaranteed; defects such as water leakage, gas leakage, liquid leakage and the like caused by the connection of crack parts, which is longer than the length of a pipe plugging device, are overcome; and the composite pipe is suitable to serve as a connection pipe for various water conveying projects and gas conveying projects, and is particularly suitable for serving as an interchangeable connection plug for a plastic pipe made of PE, PVC-U, PVC-M or the like and a ductile cast iron pipe.

Description

technical field [0001] The invention relates to an all-steel framework reinforced socket type composite pipe and a manufacturing process thereof. Background technique [0002] Existing polyethylene (PE) resin plastic composite pipes for water supply, gas supply, and liquid supply, in order to improve the performance and prolong the service life of plastic composite pipes, people have adopted steel mesh reinforcement or steel belt reinforcement or steel wire two-way winding reinforcement and Socket reinforcement and other measures and treatment methods, although the plastic composite pipe after these measures and treatment has enhanced axial rigidity and geological subsidence resistance, there are still the following problems: First, the connection between the sockets of the two pipes is uneven. It uses electric fusion pipe welding. During welding, due to the high temperature, the thermal expansion coefficients of the two materials, that is, steel wire and plastic, are differ...

AI Technical Summary

Problems solved by technology

[0002] Existing polyethylene (PE) resin plastic composite pipes for water supply, gas supply, and liquid supply, in order to improve the performance and prolong the service life of plastic composite pipes, people have adopted steel mesh reinforcement or steel belt reinforcement or steel wire two-way winding reinforcement and Socket reinforcement and other measures and treatment methods, although the plastic composite pipe after these measures and treatment has enhanced axial rigidity and geological subsidence resistance, there are still the following problems: First, the connection between the sockets of the two pipes is uneven. It uses electric fusion pipe welding. During welding, due to the high temperature, the thermal expansion coefficients of the two materials, that is, steel wire and plastic, are different, resulting in rapid stress cracking and separation of the two, resulting in leakage at the joint of the socket; second, pipes with the same diameter It adopts hot-melt butt joint. Due to the influence of construction environment or personnel operation technology, the mutual lateral movement and dislocation of the pipe walls will increase the non-roundness of the pipe butt joint, making it difficult to ensure the quality of the butt joint; third, During the maintenance process of existing PE pipes, if the broken part of the pipe is within the length of the Harfur joint, it can be connected with a Harvester joint. Maintenance of PE pipes, due to the high toughness of PE pipes, it shrinks greatly due to temperature changes, which is prone to serious losses of resources such as water leakage, gas leakage, liquid leakage, and secondary pollution to the environment caused by gas leakage; The ethylene composite pipe is a polyethylene electrofusion pipe. When connecting, the inner plastic of the pipe is melted and connected with the inner plastic of the pipe by using the heating element inside the pipe. Therefore, it must be energized during installation, and the use in remote and mountainous areas will be affected to a certain extent; Fifth, the welding equipment is heavy and must be transported by car, which is expensive and laborious, and the installation cost is too high; moreover, they cannot be interchanged with national standard ductile iron pipes, cast steel pipes, PE pipes, PVC pipes, and PPR pipes, resulting in system failure. Difficult to maintain, waste of resources

Images