Division of Labor Among Components in the Production Process of the Zhongtai 60 enalrge102 Used Pipe Mill

The Zhongtai 60-to-102 used pipe mill operates as an integrated production line where each major component performs a specialized, sequential function to transform steel coil into finished welded pipe. Understanding the distinct role of each section is crucial for efficient operation and troubleshooting of this refurbished system. The collaboration between these parts determines the line's capability to produce round pipes (Φ25–102mm) and square pipes (20x20–80x80mm) within specified thickness ranges.

1. Material Handling and Feeding Section:
This initial stage, comprising the double-head uncoiler and the vertical accumulator, is responsible for stable and continuous material supply. The double-head uncoiler holds the raw steel coil, allowing for reduced downtime during coil changeovers compared to single-head systems. Its primary function is to pay off the strip steel in a controlled manner. The vertical accumulator (or cage loop) acts as a critical buffer between the uncoiler and the main forming section. It stores a substantial length of strip, enabling the uncoiler to stop for coil threading or changing while the main mill continues to draw material from the accumulated loop. This separation of feeding from processing is fundamental to achieving continuous, uninterrupted production runs.

2. Primary Forming and Welding Section:
This is the core transformation zone of the used pipe mill. The forming machine, with its 8 horizontal and 9 vertical roll stands, performs the precise, progressive shaping of the flat strip into a cylindrical tube with open edges brought tightly together. Each stand has a specific geometric task, gradually curving the strip until the edges meet perfectly at the welding point. Following the forming section, the 200kW solid-state high-frequency welder performs the critical joining operation. It applies concentrated heat to the open seam edges via high-frequency current, forging them together under pressure to create a strong, continuous longitudinal weld. This component is the heart of the process, defining the integrity of the final product.

3. Sizing, Finishing, and Output Section:
After welding, the closed pipe proceeds to the sizing machine. This unit, equipped with 6 horizontal and 6 vertical stands (with 60mm and 35mm shafts respectively), performs the final calibration. Its role is to cold-work the welded pipe to achieve exact final dimensions, precise roundness for round pipes, or perfect 90-degree angles for square pipes, ensuring compliance with tight tolerances. The pipe then travels along the 10-meter run-out table, which serves as a cooling and conveying platform. This section allows the pipe to solidify and stabilize after the heat-intensive welding and sizing processes before reaching the final cutting stage. While not explicitly listed here, a flying cut-off or similar device typically follows, cutting the continuous pipe into predetermined commercial lengths.

In summary, the Zhongtai used pipe mill functions as a synchronized production cell. The uncoiler and accumulator manage material logistics, the forming section and HF welder execute the fundamental shaping and joining, and the sizing station with the run-out table ensures dimensional accuracy and prepares the product for handling. The effective coordination of these specialized parts, all powered by the 160kW main motor, enables this refurbished line to efficiently convert coil stock into a versatile range of tubular products.

For more information, please pay attention to the website of Jinyujie Mechanical and Electrical Used Pipe Mill Supplier：www.usedpipemill.com