Production line for coating inner wall and outer wall of metal pipe

Abstract

The invention relates to a production line for coating the inner wall and the outer wall of a metal pipe. The production line comprises a feeding device, an inner wall purging device, an outer wall purging device, a preheating furnace, an inner suction coating device, a heat supplementing furnace, an outer spraying device, a curing furnace, a forced cooling chamber, an inspection station, a labeling mechanism, a code spraying mechanism and an automatic packaging system which are sequentially arranged from front to back, the automatic packaging system comprises an material collecting and steering conveying mechanism, bagging and film covering mechanisms, an electromagnetic carrying mechanism, a hexagonal forming device, a horizontal winding device, a semi-automatic steel belt bundling mechanism, a bundling machine conveying line, a steel pipe conveying, transferring and storing mechanism, a steel pipe weighing mechanism and an electric control box, the bagging and film covering mechanisms and the code spraying mechanism are in butt joint through the material collecting and steering conveying mechanism, the material collecting and steering conveying mechanism conveys at least two workpieces to the bagging and film covering mechanisms at a time, and correspondingly, the multiple bagging and film covering mechanisms are arranged and synchronously conduct bagging and shrinking. The production line can guarantee the quality of the workpieces and improve the packaging efficiency.

Description

technical field [0001] The invention relates to the technical field of pipe processing, in particular to a production line for coating the inner and outer walls of metal pipes. Background technique [0002] Coated steel pipe is a composite pipe that uses steel pipe as the base pipe, plastic powder as the coating material, a plastic layer on the inner surface, and a plastic layer or other anti-corrosion layer on the outer surface. Also known as plastic coated steel pipe. Coated steel pipes are classified according to the coating form: internally coated steel pipes and internally and externally coated steel pipes. The purpose of coating is mainly to prevent rust, reduce the impact of corrosion on the steel pipe during actual use, and at the same time ensure the quality and appearance of the steel pipe. [0003] The following problems often occur during the internal and external coating of steel pipes: uneven coating, anti-corrosion agent dripping and anti-corrosion agent foa...

AI Technical Summary

Problems solved by technology

The basic manifestation of uneven coating is that the anti-corrosion agent is unevenly distributed on the surface of the steel pipe. Some parts are too thick, some parts are too thin or are not coated with oil at all, resulting in the thickness of the coating at the too thick part exceeding the standard, resulting in coating The waste of layer materials; too thin coating or no coating will reduce the anti-corrosion ability of the steel pipe, cause rust, and affect the service life of the steel pipe

Anti-corrosion agent dripping and hanging anti-corrosion agent solidifies on the surface of the steel pipe like water droplets. Looking at it, the steel pipe with preservative hanging drops looks rough and uneven, which directly affects the appearance of the steel pipe

The foaming of the preservative is due to the air entering the preservative, which makes bubbles form in the coating of the steel pipe. These bubbles have different sizes according to the specifications of the steel pipe; the shape of the larger bubbles is similar to that on the protective cover of some household appliances remote controls. Bubbles, pressing the bubbles with your hands will cause them to burst; the foaming phenomenon of the preservative not only affects the appearance of the steel pipe, but also makes the surface of the entire steel pipe appear rough and not smooth, and the destruction of the bubbles will reduce the standard of the coating film thickness, reduce the anti-corrosion ability, and cause Corrosion of the steel pipe where the air bubbles are located affects the use of the steel pipe

At the same time, the existing metal pipes are usually single-piece operation in the process of completing the internal and external coating and packaging, which makes it difficult to improve the packaging efficiency

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