Manufacturing method of galvanized water pipe internally coated with stainless steel

Abstract

The invention discloses a manufacturing method of a galvanized water pipe internally coated with stainless steel. The method comprises the following steps that A, the surface of the galvanized water pipe is polished, the burrs are removed, then the galvanized water pipe is flushed with the clean water repeatedly, and then the galvanized water pipe is dried at the ventilation place; B, the surfaceof a stainless steel pipe is polished and immersed into a decontaminant to remove the surface oil stain, and then the stainless steel pipe is flushed with the clean water repeatedly and dried; C, a player of high-strength adhesive is sprayed on the inner wall of the galvanized water pipe and the outer wall of the stainless steel pipe; D, the stainless steel pipe is sleeved with the galvanized water pipe; E, the stainless steel pipe is sleeved with a hole expansion mold for pipe expansion of the stainless steel pipe, so that the outer wall of the stainless steel pipe is completely stuck to theinner wall of the galvanized water pipe through the adhesive; and F, finally, the end of stainless steel pipe exposed out of the two ends of the galvanized water pipe are bent by using a bending process, and then the end of the galvanized water pipe is fixed. The manufacturing method is simple in operation, the high-strength composite of the galvanized water pipe and the stainless steel pipe can be achieved, and the service life of the galvanized water pipe is prolonged.

Description

technical field [0001] The invention relates to the technical field of pipeline production, in particular to a production method of a galvanized water pipe covered with stainless steel. Background technique [0002] In the prior art, galvanized steel pipes have been used as edible tap water delivery pipes for decades, but it has been found that galvanized steel pipes will produce harmful substances that are harmful to human health, so PVC plastic pipes and aluminum-plastic composite pipes are used in the prior art. Plastic galvanized pipes, stainless steel pipes, copper pipes or high-frequency welded pipes of stainless steel-steel composite plates can replace galvanized steel pipes. Although the above-mentioned pipes can avoid pollution in galvanized steel pipes, the mechanical strength of plastic pipes is poor, and the aluminum-plastic composite pipes are complex. Due to the different expansion coefficients of plastic and steel, plastic galvanized pipes affect the bonding s...

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Problems solved by technology

[0002] In the prior art, galvanized steel pipes have been used as edible tap water delivery pipes for decades, but it has been found that galvanized steel pipes will produce harmful substances that are harmful to human health, so PVC plastic pipes and aluminum-plastic composite pipes are used in the prior art. Plastic galvanized pipes, stainless steel pipes, copper pipes or high-frequency welded pipes of stainless steel-steel composite plates can replace galvanized steel pipes. Although the above-mentioned pipes can avoid pollution in galvanized steel pipes, the mechanical strength of plastic pipes is poor, and the aluminum-plastic composite pipes are complex. Due to the different expansion coefficients of plastic and steel, plastic galvanized pipes affect the bonding strength of the two materials. At the same time, microbes are easy to breed in plastic pipes, while stainless steel pipes and copper pipes are expensive and difficult to promote. Stainless steel composite plate high-frequency welded pipes Affected by high temperature in the production process, the energy consumption is large, which will damage the galvanized layer

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