Large-Diameter Seamless 3PE Anti-Corrosion Coating Production Line for Bent Pipes.

As a technology-driven SME, Hebei Haochen Environmental Protection has continuously strived to enhance its innovation capabilities, achieving breakthroughs in key technologies for large-diameter seamless 3PE anti-corrosion production lines for bent pipes. This has laid a solid foundation for comprehensively upgrading the industrial structure of its products and promoting the development of the green energy industry.

Current 3PE anti-corrosion steel pipe production lines are predominantly used for coating straight pipes. Due to the bending process and its unique manufacturing requirements, anti-corrosion coating for bent pipes relies heavily on manual labor. Effective solutions for managing springback, elongation, and forming radius have been lacking, making bent pipe coating a critical bottleneck in pipeline anti-corrosion quality.

Research into key technologies for large-diameter seamless 3PE anti-corrosion production lines for bent pipes first requires developing side-guided large-diameter spiral molds. By employing flow-splitting technology at the guide ports to evenly divide a single raw material bundle, 3PE processing of large-diameter bent pipes becomes feasible. This yields a dense, smooth protective layer that tightly adheres to the outer surface of the bent pipe, replacing traditional bent pipe wrapping anti-corrosion processes to achieve seamless, one-step encapsulation. Second, designing a “variable-bend pipe conveyor line” that fixes the anti-corrosion center of the pipe. This breaks the conventional conveyor line framework, allowing pipes with different diameters, curvature radii, and angles to undergo anti-corrosion processing on the same production line. Then, designing a coaxial rotating unit for bent pipes. It employs the principle of asynchronous inner and outer shafts to solve the problem of pipes with different diameters rotating at the same line speed, achieving continuous, precise, and automatic wrapping. It can also process multiple bent pipes simultaneously.

In advancing its innovation capabilities, Haochen has developed and launched the 426-1220 bent pipe winding 3PE anti-corrosion production line and the variable-diameter bent pipe 3PE anti-corrosion precision processing complete production line. This system achieves precise machining and automatic adaptation to product specifications, replacing the current manual wrapping and spraying methods for 3PE corrosion protection on bent pipes. It resolves technical shortcomings such as low machining accuracy, limited pipe diameter range, low automation and continuous processing levels, low industrialization standards, and severe raw material waste. This significantly enhances corrosion protection effectiveness for bent pipes and overcomes key challenges constraining pipeline corrosion protection quality.

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