Automated 3PE Coating Line with PLC Intelligent Control for Steel Elbows and 4-6 Times D Curvature Radius Pipes
Steel Elbow 3PE Anti-Corrosion Coating Production Line
Industrial Elbow Bend Steel Pipe FBE & 3LPE Coating Making Equipment
Product Description
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. It is widely used in industrial applications such as:
- 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, including:
- 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.
Working Principle
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
Product Parameters
| Item | Name | Specification |
|---|---|---|
| 1 | Steel Pipe Diameter | 426, 630, 720, 820, 1000, 1200 mm |
| 2 | Curvature Radius | 4–6 times pipe diameter (D) |
| 3 | Elbow Angle | 15°–90° |
| 4 | Steel Pipe Wall Thickness | 8–12 mm |
| 5 | Epoxy Powder Thickness | ≥170 μm |
| 6 | AD Copolymer Adhesive Thickness | 170–250 μm |
| 7 | PE Layer Thickness | 2.5–3.7 mm |
Detailed Equipment Description
1. Elbow Conveyor Line
The elbow conveyor line is specially designed for the smooth transportation and rotation of curved steel pipes during blasting, heating, coating, and wrapping.
Main Features
- 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.
2. Intermediate Frequency Heating System
The intermediate frequency heating system ensures uniform and efficient heating of elbow pipes before coating.
Main Features
- 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.
3. Elbow Powder Spraying System
The powder spraying system is designed for precise and uniform application of FBE epoxy powder on the curved pipe surface.
Main Features
- 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.
4. Powder Recovery System
The powder recovery system improves powder utilization and maintains a cleaner production environment.
Main Features
- 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.
5. PE Wrapping / Winding Machine
The winding machine is used for wrapping the PE outer protective layer around the elbow pipe after the epoxy and adhesive coating process.
Main Features
- 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.
6. PLC Control System
The entire production line is equipped with an advanced PLC intelligent control system for automatic operation and process management.
Main Features
- 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.
Our Advantages
√ Recognized Innovation
Awarded as the First (Set) Technical Equipment in Shandong Province, demonstrating strong technical innovation and manufacturing capability.
√ High Efficiency & Stability
The production line is designed for reliable operation, stable performance, and consistent coating quality.
√ Automation & Intelligence
Advanced automation significantly reduces manual labor, improves safety, and enhances production efficiency.
√ Global Export Capability
Approximately 70% of Huashida products are exported to:
- Europe
- America
- Middle East
- Central Asia
- Africa
- Russia
- Other international markets
√ Strong Market Presence
With years of industry experience and extensive overseas project experience, Huashida has earned long-term trust from customers worldwide.
Company Profile
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
By combining advanced domestic and international technologies and through over two decades of dedicated development, Huashida has become one of the Top 3 manufacturers in this industry in China.
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
Get in Touch
Have questions about our products or want to discuss a custom order? Our team is ready to help you.