A plastic-lined cast iron pipe and its manufacturing method

Abstract

A plastic-lined cast iron pipe and its manufacturing method, the plastic-lined cast iron pipe includes a cast iron pipe and a plastic composite pipe, the plastic composite pipe is composed of an outer layer of hot-melt adhesive layer and an inner layer of plastic pipe, the The plastic composite pipe is made online, the inner wall of the cast iron pipe is sandblasted, shot blasted or shot blasted after being polished, the plastic composite pipe is pulled into the treated cast iron pipe, and the plastic composite pipe is double End sealing, inflation, heat treatment, cooling, cast iron pipe and plastic composite pipe bonding, trimming, spraying, marking. The invention also includes a manufacturing method of the plastic-lined cast iron pipe. The invention can overcome the defects of the existing cement mortar-lined ductile iron pipes and epoxy resin and epoxy ceramic-lined ductile iron pipes, and is suitable for water supply, gas, drainage, sewage, heating and other fields, and is currently the most ideal Water pipe products.

Description

technical field [0001] The invention relates to a plastic-lined cast iron pipe and a manufacturing method thereof. Background technique [0002] Existing ordinary cast iron pipes are often used as water supply pipelines because of their better overall performance. In order to solve the problem of corrosion resistance of cast iron pipes, the most common method is to use cement mortar lining or epoxy resin, epoxy Ceramic lining is the preferred anti-corrosion method for this type of pipeline; cement mortar lining is used as drinking water pipeline, because the inner wall is not smooth, the water flow resistance is large, and it is easy to scale, and the reaction substances produced by cement hardening affect the water quality. The thickness of the lining Larger, reaching 3-12mm, lower water delivery efficiency, cement lining causes the weight of the entire pipe body to increase, which is not conducive to construction and installation, and the cement lining is inconvenient to p...

AI Technical Summary

Problems solved by technology

[0002] Existing ordinary cast iron pipes are often used as water supply pipelines because of their better overall performance. In order to solve the problem of corrosion resistance of cast iron pipes, the most common method is to use cement mortar lining or epoxy resin, epoxy Ceramic lining is the preferred anti-corrosion method for this type of pipeline; cement mortar lining is used as a drinking water delivery pipeline, because the inner wall is not smooth, the water flow resistance is large, and it is easy to scale. The reactive substances produced by cement hardening affect the water quality, and the thickness of the lining Larger, reaching 3-12mm, the water delivery efficiency is low, the cement lining causes the weight of the entire pipe body to increase, which is not conducive to construction and installation, and the cement lining is inconvenient to process, poor adhesion, impact and pipe material during construction and installation Deformation can easily cause cement to fall off, and there are still many difficulties to be solved in the cement lining, so the cement lining is not a good lining method; the epoxy resin lining is used, because the lining layer is easy to delaminate, the material cost is high, and the environment The impact of harmful substances produced during the curing process of epoxy resin on water quality and human health is difficult to promote on a large scale. The use of epoxy ceramic lining, although it will have high adhesion and smoothness, is difficult to manufacture, complex equipment, and high cost. , can only be used for special projects, and cannot be widely used