Novel steel pipe outer surface 3PE full powder anticorrosion production line and anticorrosion technology

Abstract

The invention discloses a novel steel pipe outer surface 3PE full powder anticorrosion production line which comprises a flame preheating furnace, a shot blasting machine, an in-pipe cleaning device,an intermediate frequency heating furnace I, a pickling phosphating chamber, a high-pressure water cleaning and air drying chamber, a medium frequency heating furnace II, an epoxy powder electrostaticspraying device, a coating heating furnace I, an adhesive powder coating device, a coating heating furnace II, a polyethylene powder coating device, a coating leveling furnace, a water cooling device, an electric spark leak detecting device and a pipe end grinding device which are arranged in sequence. The invention further discloses a novel steel pipe outer surface 3PE full powder anticorrosiontechnology. The technology includes the following steps of preheating, shot blasting, purging, re-preheating, pickling phosphating, water cleaning, air drying, heating, powder electrostatic spraying,coating heating I, adhesive coating, coating heating II, polyethylene coating, coating leveling, water cooling, anti-corrosion layer leak detection and end hitting; and the problems that the 3PE coating thickness is uneven and defects exist in a welding line of a steel pipe are solved.

Description

technical field [0001] The invention belongs to the technical field of welded steel pipe manufacturing, and in particular relates to a novel 3PE full powder anticorrosion production line and anticorrosion process for the outer surface of steel pipes. Background technique [0002] Most of the existing 3PE steel pipe anti-corrosion production lines use intermediate frequency preheating, shot blasting and dust treatment to carry out pre-treatment before coating, so as to reach the anchor pattern depth and cleanliness level on the surface of the steel pipe before coating, thereby ensuring the anti-corrosion layer of the steel pipe. the quality of. In the existing steel pipe 3PE anticorrosion, the epoxy layer is electrostatically sprayed with epoxy powder, and the adhesive layer and polyethylene layer are wound with diaphragms produced by extruders, and then enter the water cooling room to cool and shape. Although this production process has been in use, and almost all pipe fact...

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Problems solved by technology

[0003] The present invention solves the deficiencies of the prior art, provides a new type of steel pipe outer surface 3PE full powder anti-corrosion production line and anti-corrosion process, solves the problems of uneven thickness of the 3PE coating of the existing steel pipe and defects at the weld of the steel pipe, and Coating anti-corrosion effect is good

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