Industrial Elbow Bend Steel Pipe 3LPE Coating Production Line with PLC

The Qingdao Huashida Steel Elbow 3PE Anti-Corrosion Production Line is specially designed for the external anti-corrosion coating of steel elbows, hot-bent pipes, and curved steel pipes.

Widely used in industrial applications including:

• Oil and gas transportation
• Water supply pipelines
• Sewage and drainage systems
• Chemical transportation pipelines

This production line integrates multiple key processes into one efficient and continuous workflow:

• Pipe conveying
• Surface blasting / rust removal
• Intermediate frequency heating
• FBE epoxy powder spraying
• Adhesive and PE tape wrapping
• Cooling and shaping
• PLC intelligent control

The anti-corrosion structure adopts the standard 3PE coating system:

• FBE Epoxy Powder Layer
• Adhesive Layer
• Polyethylene Outer Layer (PE Tape)

This structure provides excellent corrosion resistance, strong adhesion, high mechanical protection, and long service life, making it an ideal solution for industrial pipeline protection.

The line is equipped with at least 16 sets of elbow pipe conveying structures, on which the curved pipes are placed and transported during the coating process.

The rotating shaft of the driving mechanism is powered by a motor to rotate the gear ring, enabling the elbow pipe to rotate smoothly around its center. The supporting rubber roller can be adjusted in height through the lifting device of the conveying structure, allowing the system to adapt to different pipe diameters while maintaining a uniform center height.

This design ensures:

• Stable pipe conveying
• Smooth and synchronized pipe rotation
• Accurate heating and coating
• High production efficiency

The complete system is suitable for curved steel pipe blasting, coating, and PE layer wrapping, with the anti-corrosion form of: Epoxy Powder + Adhesive + PE Tape

The elbow conveyor line is specially designed for the smooth transportation and rotation of curved steel pipes during blasting, heating, coating, and wrapping.

• Independent center rotation drive
• Gear ring transmission system
• Frequency-controlled operation
• Main components equipped with protective supporting wheels
• Supporting wheels mounted on slide rails for easy installation and adjustment
• Fixed-angle self-locking transmission structure
• Height lifting adjustment

This system ensures stable movement and accurate positioning of elbow pipes throughout the production process.

The intermediate frequency heating system ensures uniform and efficient heating of elbow pipes before coating.

• Angle handwheel adjustment
• Front and rear electric adjustment
• Height adjustment through the conveyor line
• Narrow heating thickness design to avoid uneven heating at the bending section
• Intermediate frequency power: 350 kW
• Dual closed-loop regulation of voltage and current

This system guarantees stable heating performance and helps improve coating adhesion and quality.

The powder spraying system is designed for precise and uniform application of FBE epoxy powder on the curved pipe surface.

• Annular powder spraying chamber
• Front and rear electric adjustment of powder spraying chamber
• Spray guns swing automatically left and right
• CNC adjustment of powder output
• Equipped with 12 powder spray guns
• U-shaped bottom blowback recovery structure
• Main body made of 304 stainless steel
• High-strength negative pressure recovery duct, resistant to deformation

This system ensures even powder distribution and excellent coating consistency.

The powder recovery system improves powder utilization and maintains a cleaner production environment.

• Powder injection and recovery system
• Air duct adaptable to different pipe diameters
• Cyclone + filter cartridge dust removal for standard discharge
• U-shaped bottom structure + pulse back-blowing for more thorough powder recovery
• 304 stainless steel fluidization tank
• Vibrating screen powder filter
• Equipped with 12 venturi powder pumps

This system helps reduce material waste and increase operating efficiency.

The winding machine is used for wrapping the PE outer protective layer around the elbow pipe after the epoxy and adhesive coating process.

• Automatic belt locking
• One-side anti-corrosion operation
• Continuous PE tape winding
• Tight and uniform strip wrapping
• High degree of automation
• Computer-based automatic strip calculation
• Pipe center deviation does not affect winding performance

This system ensures compact, even, and reliable PE layer wrapping.

The entire production line is equipped with an advanced PLC intelligent control system for automatic operation and process management.

• Data collection
• Parameter editing
• Memory function
• Automatic calculation of strip consumption
• Automatic acquisition and correction of transmission speed

The PLC system improves automation, reduces labor intensity, and ensures stable product quality.

Qingdao Huashida Machinery Co., Ltd. was established in 2003. Since its foundation, Huashida has focused on the research, development, and manufacturing of:

• Plastic polyurethane insulation pipe production lines
• 3PE anti-corrosion pipe production lines
• Large-diameter underground pipe production lines
• Plastic pipe joint equipment

For more than 20 years, we have continuously emphasized technological innovation and R&D investment. Huashida has maintained close cooperation with:

• Beijing University of Chemical Technology
• Qingdao University of Technology
• Other scientific research institutions

Our machines have been widely recognized and exported to many countries and regions, including:

• Saudi Arabia
• Kazakhstan
• Uzbekistan
• United Arab Emirates
• Turkey
• Russia
• And many other international markets