Multi-layer heterogeneous material integrated tube and its manufacturing process

Abstract

Disclosed are a multi-layer special-material integrated pipe and a manufacturing technique thereof. The integrated pipe comprises an outer primary pipe and an inner secondary pipe which are produced and integrated through on-line production equipment, the primary pipe is produced in advance or online, a blank of the secondary pipe is produced online and is composed of a plastic base layer and a solid gum layer, the external diameter of the blank is slightly larger than the internal diameter of the primary pipe, the blank forms a frozen body via U-shaped deformation, and finally the frozen body is inserted into an inner cavity of the primary pipe subjected to thermal expansion to be integrated. When an integrated body is used in high temperature or extremely cold environment, the primary pipe and the secondary pipe are still firmly connected without cracking and layering. By the technical scheme, the defects of lack of smoothness and high passing resistance, or proneness to scaling and falling off, or proneness to layering and deforming, or high manufacturing difficulty and high input cost, or poor applicable temperature-difference environmental function and the like of a protective coating on the inner wall of an existing hard pipe used for water supply, gas supply and oil supply and delivery are overcome; the integrated pipe is suitable for water, gas and oil delivery of various municipal works and industrial and mining establishments, and particularly suitable for pipe products for water supply of the municipal works.

Description

technical field [0001] The invention relates to a multi-layer heterogeneous material integrated pipe and its manufacturing process. Background technique [0002] Existing hard pipes for water supply, gas supply, and oil supply are made of metal or non-metal. The metal is mainly made of cast iron, and the non-metal is mainly made of cement, namely cement pipe, plastic The material is plastic tube. In order to improve the anti-corrosion performance of the pipeline, enhance the efficiency of passage in the pipeline and prolong the service life of the pipeline, people continue to carry out a lot of research on it and adopt the method of fixing the protective layer on the inner wall of the hard pipeline lumen. The method of fixing the protective layer has been used. : Cement mortar material or epoxy ceramic material is used as the protective layer on the inner wall of the hard pipe lumen. While cement mortar is used as the protective layer, the inner wall of the lumen has poor ...

AI Technical Summary

Problems solved by technology

The protective layer made by this method can still be used in the environmental conditions with little change in climate temperature; but for the regions with very low temperature in winter in the north, when the hard pipes with the protective layer made on the inner wall of the lumen are piled up, due to the protection The difference in thermal expansion coefficient between the layer (thin wall) and the inner wall of the lumen is generally used as a plastic tube or alloy tube (thin wall) as a protective layer, and its shrinkage rate is several times that of a hard tube. The protective layer ( Thin wall) is separated from the inner wall of the hard pipe lumen under the action of temperature, and loses the fixing effect; especially in areas exposed to the sun in summer, the diameter of the protective layer (thin wall) expands when heated at high temperatures, forming a squeeze on the inner wall of the lumen. Wrinkled and delaminated with it, losing the effect of the protective layer, so it cannot be used in areas with large temperature differences

To sum up, the existing hard pipelines used for water supply, gas supply, and oil supply, no matter which method is used to make the protective layer on the inner wall of the lumen, all have: or the inner wall is not smooth, and the passage resistance is large; or it is easy to scale and fall off ; or easy to delaminate, easy to deform; or difficult to manufacture, high equipment cost investment; or suitable for low temperature environment and other defects

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