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

A coating production line and anti-corrosion coating technology, applied in pipeline anti-corrosion/rust protection, coatings, devices for coating liquid on the surface, etc., can solve the problems of high operating intensity, long curing time, high internal stress of the coating, etc. problems, to achieve the effect of improving the efficiency of coating operations, high efficiency of coating operations, and improving impact resistance

Active Publication Date: 2009-12-23
宁波华恒防腐工程有限公司
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AI-Extracted 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 h...
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Method used

Adopt above-mentioned automated production line to spray three layers of anti-corrosion coatings on large-scale steel pipe, every road paint completes as long as the time of 20 minutes from spraying to the cooling after solidification, so three...
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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.

Application Domain

Pretreated surfacesCorrosion prevention +3

Technology Topic

Steel tubeSurface finishing +3

Image

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

Examples

  • Experimental program(1)

Example Embodiment

[0033] The present invention will be further described in detail below with reference to the embodiments of the drawings.
[0034] Such as figure 1 As shown, the large-scale steel pipe anticorrosive coating automatic coating production line includes: steel pipe conveying mechanism 1, dehumidification and decontamination machine 2, automatic shot blasting machine 3, preheating drying room 4 and spraying room 5, paint film curing room 6 and The spray paint curing unit composed of the cooling room 7 needs to be painted with three coats of primer, intermediate paint and top paint in this embodiment. Therefore, three curing units are arranged in a straight line before and after, namely the first spray paint curing unit and the second spray paint. The curing unit and the third spray paint curing unit.
[0035] The steel pipe conveying mechanism 1 includes a plurality of roller groups arranged at intervals and equal heights. Each roller group is composed of two rollers arranged side by side and rotating in the same direction. The shaft centers of the rollers in each roller group are connected with each other. The line is inclined to the horizontal plane, so that the steel pipe can advance spirally on it; and the steel pipe 8 is located on at least two adjacent roller sets during transportation. Only two roller sets are provided in each paint curing unit, and the two The roller sets are located before the spray booth 5 and after the cooling room 7 respectively.
[0036] The described dehumidification and decontamination machine 2 adopts diesel burners for gas boilers, or other existing equipment; the automatic shot blasting machine 3 adopts conventional equipment; the preheating drying room 4 is located on both sides of the steel pipe 8 below. The inclined steel pipe 8 is provided with two nozzles, please refer to figure 2 , Each nozzle is connected with a hot air source, and hot air is sprayed obliquely toward the steel pipe 8 from both sides below the steel pipe 8 to heat the steel pipe 8.
[0037] Each spray booth 5 is equipped with a high-pressure airless sprayer 9. The nozzle of the high-pressure airless sprayer is located above the steel pipe 8 and inclined to the steel pipe 8. Please refer to image 3 The paint inlet of the high-pressure airless spraying machine is connected to the outlet of the paint automatic heating device, wherein the paint automatic heating device can be a conventional paint heating device; each paint film curing room 6 is equipped with a hot air circulation system. The hot air circulation system also uses conventional technology; the cooling rooms 7 in this embodiment are all cooled by natural air (air-conditioning cold air can also be used if necessary).
[0038] The steel pipe 8 in this embodiment needs to be sprayed with three paint layers, that is, the primer is epoxy resin, the solvent content is about 8%, the curing temperature is 90±10°C, the intermediate paint is epoxy resin, and the solvent content is about The curing temperature is 6%, the curing temperature is 90±10°C, the top coat is epoxy resin, the solvent content is 1%, and the curing temperature is 90±10°C.
[0039] The automatic coating process of large-scale steel pipe anti-corrosion coating using the above-mentioned anti-corrosion coating automatic coating production line is as follows:
[0040] ①The large steel pipe 8 with a diameter of 1.8 meters and a length of 60 meters to be sprayed is hoisted on the steel pipe conveying mechanism 1 with a suitable crane structure, and the steel pipe conveying mechanism is turned on. The two rollers of each group of rollers rotate in the same direction. , Make the steel pipe 8 spiral forward between the roller groups; when the steel pipe 8 passes through the dehumidification and decontamination machine 2, the combustion flame generated by the diesel burner is sprayed to the surface of the steel pipe to remove the water and oil on the surface of the steel pipe 8;
[0041] ②The steel pipe 8 after dehumidification and decontamination enters the automatic shot blasting machine 3 to remove the rust layer and oxide layer on the surface of the steel pipe, so that the surface of the steel pipe meets the requirements of cleanliness and roughness before painting;
[0042] ③Then the steel pipe 8 enters the preheating drying room 4, such as figure 2 As shown, two nozzles blow the hot air flow from the diagonally below the steel pipe 8 to the steel pipe 8, heat the steel pipe 8 to a first temperature value of 50-70°C, and then transport it to the spray booth 5;
[0043] ④The automatic heating mechanism heats the paint to the second temperature value of 50-70°C and then sends it to the high-pressure airless sprayer, mixes it with the curing agent evenly and sprays it on the surface of the steel pipe 8 in the form of a mist from the diagonally above the steel pipe 8; image 3 Shown; control the paint from entering the high-pressure airless sprayer to spraying within 3 minutes;
[0044] ⑤After the primer spraying is completed, the steel pipe enters the paint film curing room 6, and the hot air circulation system set in the paint film curing room sends out hot air, such as Figure 4 As shown, the hot air blows from both sides of the steel pipe 8 to the steel pipe sprayed with the primer, and the steel pipe 8 is heated to 90±10°C, so that the paint film of the primer is cured quickly, and the hot air cycle takes away the primer Volatilized solvent;
[0045] ⑥ Then, the steel pipe 8 enters the cooling room 7, and natural wind blows to the steel pipe 8 from both sides of the steel pipe 8 to make it cool quickly;
[0046] Since the spray paint curing unit is only equipped with two roller sets before the spray booth 5 and after the cooling room 7, so during the entire process from the beginning of the primer spraying to the curing and cooling of the paint film, the sprayed section will not touch the rollers, so The paint layer that has not cooled will not damage the paint film in contact with the roller.
[0047] ⑦The steel pipe 8 after the primer has cooled down successively enters the second spray paint curing unit and the third spray paint curing unit, repeating steps ④, ⑤, ⑥; wherein the automatic heating mechanism in the spray booth in the second spray paint curing unit heats the intermediate paint to 50 Enter the high-pressure airless sprayer after -70℃, the temperature in the paint film curing room is 90±10℃; the temperature of the topcoat entering the high-pressure airless sprayer in the spray room of the third spray paint curing unit is 50-70 ℃, the temperature in the paint film curing room is 90±10℃.
[0048] So far, the spraying operation of the large steel pipe 8 is completed.
[0049] The parts not involved in this embodiment are all the same as in the prior art.
[0050] Using the above-mentioned automated production line to spray three layers of anti-corrosion coatings on large steel pipes, each paint takes only 20 minutes from spraying to solidification and cooling. Therefore, it only takes 1 hour to complete all three paints, which greatly shortens the working time. , Improve the production efficiency, and because of the full automatic operation, the coating quality of the paint layer is also greatly improved.

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Description & Claims & Application Information

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