Automatic coating technology of large-scale steel pipe anticorrosion coating and production line thereof

Abstract

The invention relates to an automatic coating technology of large-scale steel pipe anticorrosion coating and a production line thereof. The coating technology adopts the steps that steel pipes enter into a dehumidification cleaner, an automatic shot blasting machine, a preheating drying chamber, a spray chamber, a paint film solidifying chamber and a cooling chamber under the conveying of a steel pipe conveying mechanism, and after decontamination, dehumidification, surface treatment and preheating, the steel pipes enter into paint spraying, paint film solidifying and cooling processes; the production line comprises a steel pipe conveying mechanism, a dehumidification cleaner, an automatic shot blasting machine and a preheating drying chamber, wherein, the automatic shot blasting machine is arranged between the dehumidification cleaner and the preheating drying chamber; the automatic coating technology and the production line are characterized in that a paint spraying and solidifying unit is also arranged at the rear part of the preheating drying chamber; the paint spraying and solidifying unit comprises a spray chamber, a paint film solidifying chamber and a cooling chamber which are arranged in a line from the front part to the rear part in sequence, wherein, a coating machine for coating anticorrosion coat to the surfaces of the steel pipes is arranged in the spray chamber, and a hot air circulating system is arranged in the paint film solidifying chamber. The invention has the advantages that continuous and automated operation can be performed on a production line, the production efficiency is high, the coating quality is good, and environmental pollution is avoided.

Description

technical field [0001] The invention relates to a pipe anticorrosion treatment process and a production line thereof, more specifically to a large-scale steel pipe anticorrosion coating automatic coating process and a production line thereof. Background technique [0002] Large steel pipes usually refer to steel pipes with a diameter of 0.5 to 2.4 meters and a length of 12 to 90 meters. In recent years, with the rapid development of my country's national economy, more and more large-scale steel pipes are used in port terminals, marine engineering and municipal engineering. In order to effectively control the corrosion of large steel pipes, prolong the service life of large steel pipes, and ensure the safe operation of infrastructure, it is necessary to carry out surface anticorrosion treatment on steel pipes. The most commonly used anti-corrosion treatment method is to apply anti-corrosion coatings on the surface of steel pipes. At present, the anti-corrosion coating of la...

AI Technical Summary

Problems solved by technology

Although the above-mentioned artificial coating method can realize the anti-corrosion treatment of steel pipes, it has the following defects: (1) Due to the high content of organic solvents in the coating, a large amount of organic solvents will volatilize during the drying process of the coating, which will not only pollute environment, and the working environment is poor, the work intensity is high, and there are hidden dangers to the health of the operators; (2) At the same time, because large steel pipes cannot be rolled in place during manual coating, and the viscosity of the coating required for construction should not be too high, usually The content of organic solvent in the paint is sometimes as high as 15%, which will cause the paint film to hang after painting, resulting in uneven phenomenon of thin top and bottom thickness, which greatly reduces the overall anti-corrosion performance of the steel pipe coating

(3) The manual coating of large steel pipes is generally carried out in an open environment indoors or in the open air. Due to the limitations of natural conditions such as the construction environment and weather, the time for painting operations depends on the weather conditions, and the painting of large steel pipes cannot be guaranteed. Quality, progress and efficiency; at the same time, after the coating is finished, the curing of the coating is completed in the natural environment, so it also has the characteristics of long curing time and large construction site

However, as a single coating system, its application examples are rarely seen abroad. This is mainly because the temperature changes too much during the coating construction process, and the expansion coefficients of the steel pipe and the coating are different, making the coating exist. High internal stress, easy to be damaged under the action of external force; and the damaged coating is difficult to repair at the construction site with the same construction technology

[0005] The three-layer PE coating automatic coating production line is mainly used for anti-corrosion coating of buried steel pipes. Most of the steel pipes processed can only be about ten meters in length, and longer steel pipes cannot be processed.

Therefore, three-layer PE cannot be applied to the construction of anti-corrosion coating for large steel pipes, and the use of three-layer PE coating is rarely used in port terminals and marine engineering

[0006] The disclosed large-scale steel pipe automatic coating production line at present, such as Chinese patent publication number is CN1673604A, CN1672809A and Chinese patent authorization announcement number is in the patent literature of CN1122772C, what disclose is to adopt primer to add adhesive tape winding or PE as coating material, and There are few reports on automatic coating production lines using high solid content coatings

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