Two-component spraying system

Abstract

The invention discloses a two-component spraying system which comprises a first material conveying system, a second material conveying system and a spray gun, wherein the structure of the first material conveying system is identical to that of the second material conveying system; a discharge port of a first material conveying pump of the first material conveying system is communicated with a mixing device through a first material conveying pipe; a first gear pump and a first flow meter are sequentially arranged on the first material conveying pipe; the output end of the mixing device is connected with the spray gun; the output end of a programmable logic controller (PLC) is respectively connected with the control ends of the first gear pump and a second gear pump; and the output ends of the first flow meter and a second flow meter are respectively connected with the input end of the PLC. In the invention, the PLC and the flow meters are used for accurately controlling the flow and the ratio of two-component coatings, and the flow and the ratio are automatically regulated by utilizing programs; and the ratio regulation range of two components is wider.

Description

technical field [0001] The invention relates to a spraying device, in particular to a two-component spraying system, which is used for spraying the inner and outer coatings of ductile iron pipes. Background technique [0002] The anti-corrosion effect of the inner and outer surfaces of ductile iron pipes directly affects its scope of use and service life. The inner surface of the traditional ductile iron pipe anti-corrosion coating is lined with cement; the outer surface is first sprayed with zinc, and then sprayed with solvent-based asphalt paint. With cement as the lining, it is suitable for the transportation of clean tap water, but it does not have anti-corrosion performance and poor wear resistance for other highly corrosive media such as acids and alkalis, which greatly affects the application field of ductile iron pipes. In addition, the toxicity of asphalt is also an important reason affecting its use. [0003] In recent years, polyurethane coatings, especially sol...

AI Technical Summary

Problems solved by technology

The outer surface of the cast pipe sprayed by the above spraying method can meet the international quality requirements, but the inner surface of the cast pipe cannot be atomized due to the change of the pipe diameter, so the quality requirements cannot be met; and the difference between the two components is manually adjusted. The ratio is inaccurate; and due to the rapid solidification of the paint after mixing, it often causes gun blockage and cannot be continuously produced; it is especially difficult to solve the spraying of two-component paints with different ratios, different atomization methods, and different viscosity ranges.

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