As the core front-end process equipment of the spiral submerged arc welded pipe production line, the uncoiler serves as the fundamental raw material feeding unit for the entire pipe forming system. It undertakes the core technological functions including hot-rolled coil bearing & clamping, automatic coil decoiling, strip head separation and constant-rate feeding. The operational stability and automation grade of the equipment dominate the processing quality of subsequent working procedures such as plate levelling, edge milling, pipe forming and seam welding, acting as the critical auxiliary equipment for the continuous and standardized production of large-diameter heavy-wall spiral welded pipes. Developed and manufactured exclusively by Taiyuan Jintong Heavy Industry, this dedicated uncoiler is custom-matched for spiral welded pipe production lines and widely applicable to the precision fabrication of high-end engineering pipes for water conservancy projects, pile foundation engineering, oil and gas transmission and other key fields.

          The equipment adopts an integrated heavy-duty frame structure featuring high integral rigidity and ultra-large load-bearing capacity. Adopting precision fusion welding and artificial aging stress relief treatment, the frame effectively eliminates structural deformation and vibration displacement under heavy-load cyclic operation. It is fully adaptable to long-duration continuous production of large-tonnage, extra-wide and heavy-gauge hot-rolled steel coils. With outstanding structural durability and anti-fatigue performance, the equipment meets the high-frequency and long-cycle continuous operation requirements of industrial spiral pipe production lines. Replacing conventional mechanical transmission structures, the full-hydraulic drive system delivers stable power output and high torque reserve. It supports stepless intelligent speed regulation synchronized with the production line operating speed, realizes soft start-stop buffering and uniform strip feeding, and thoroughly eliminates typical process defects including strip tension fluctuation, strip oscillation and inconsistent feeding speed, ensuring high stability of the pipe forming process.

           Equipped with a hydraulic cone-type coil expanding mechanism — the core clamping component for coil positioning — the uncoiler adopts double-end cone head clamping for both inner and outer coil rings with infinitely adjustable expanding tension. It achieves rigid positioning of steel coils with variable inner diameters, thoroughly eliminating operational risks such as axial play, radial loosening and coil loose unwinding during high-speed operation. This fundamentally prevents process defects including strip wandering and pipe edge misalignment, significantly reducing the defective rate of pipe forming and welding procedures. Meanwhile, the integrated hydraulic automatic strip peeling mechanism executes precise cylinder-stroke controlled strip head separation. With smooth and stable kinematic performance, it realizes automated strip head peeling without manual intervention. The mechanism eliminates occupational safety hazards caused by manual decoiling operations, protects the strip surface from mechanical damage such as scratching, creasing and plastic deformation, and provides qualified defect-free strip materials for downstream production processes.

            To enhance production continuity and feeding positioning accuracy, the unit is equipped with a full-automatic anti-loosening hold-down device. During decoiling operation, the pressure roller maintains constant compression and limiting positioning on the coil outer ring, effectively suppressing strip springback, coil loosening and rebound deviation. It ensures uniform strip feeding tension and consistent feeding rhythm, fully accommodating the high-hardness and high-tension processing characteristics of heavy-gauge steel strips. In addition, the built-in high-precision automatic centering and deviation correction system conducts real-time dynamic monitoring of strip lateral position and implements automatic micro-adjustment correction. This guarantees that the steel strip is conveyed strictly along the production line center datum, effectively improving the machining accuracy of milled bevels and the roundness tolerance of formed pipes, controlling pipe body misalignment within standard tolerance, and ensuring the geometric dimensional accuracy of finished spiral steel pipes complies with industry specifications.

             The entire equipment set adopts PLC centralized automatic control and supports linkage synchronous operation with the whole spiral welded pipe production line, featuring high automation integration and convenient human-machine operation. The system integrates multi-dimensional safety protection mechanisms including overload protection, material jam early warning and strip deviation alarm. When abnormal working conditions such as coil jamming, tension anomaly and equipment overload occur, the control system will trigger real-time early warning and automatic emergency shutdown to avoid structural equipment damage and production safety accidents, greatly improving the overall operational safety and stability of the production line.

             Compared with traditional conventional decoiling equipment, the optimized uncoiler independently developed by Taiyuan Jintong Heavy Industry targets the core technical pain points in large-diameter heavy-wall spiral pipe production, with upgraded structural rigidity and operational stability. By virtue of stable raw material supply precision, real-time feeding deviation correction and full-process automated operation, the equipment ensures procedural stability and finished product consistency of the entire production line from the upstream process. It effectively improves the overall production capacity of spiral welded pipe lines, reduces manual operation costs and product rework rates, and is a high-performance indispensable core front-end process equipment for modern high-standard spiral welded pipe manufacturing lines.