The leveler, also known as the straightening machine, is the core precision processing equipment in the middle section of the spiral welded pipe production line, and also a vital pre-processing unit in the supporting system of the spiral welded pipe machine unit. Installed after the uncoiler and before the forming machine, it serves as a key process device of the complete spiral welded pipe production line from Taiyuan Jintong Heavy Industry. It is mainly used to fully straighten the steel strip after uncoiling, correct strip shape and eliminate residual internal stress of the material. During rolling, storage and transportation, steel coils are prone to deformation defects such as bending, waviness, edge curling and twisting. If the steel strip is fed directly into the spiral welded pipe machine for forming and welding without leveling, it will directly cause quality problems including strip misalignment, weld offset, inconsistent pipe diameter and pipe body bending, which seriously affect the precision of finished welded pipes. Therefore, the operational stability and leveling accuracy of the leveler directly determine the finished product quality and qualification rate of the entire spiral welded pipe production line.

             The leveler developed and manufactured by Taiyuan Jintong Heavy Industry specially for spiral welded pipe production lines adopts an integrated heavy welded frame with sufficient rigidity and strong load resistance. It is not easy to deform or vibrate under long-term leveling pressure from thick steel strips, delivering excellent operational stability. The whole machine is equipped with multiple sets of high-precision upper and lower leveling rolls, intelligent hydraulic adjustment system, independent main drive system, overload protection device, synchronous speed regulating mechanism and dedicated electric control system. All mechanisms work in coordination and can match the running speed of the spiral welded pipe machine in real time to realize continuous, uniform and stable automatic leveling of steel strips. The equipment adopts a mature staggered roll arrangement in the industry. Through multiple micro plastic bending corrections, it completely eliminates waviness on the steel strip surface, edge curling and residual internal stress, making the steel strip flat and uniform to meet the high-precision feeding standard for spiral welded pipe forming.

              The core working principle of this leveler is the multi-roll continuous plastic straightening process. The steel strip passes through the orderly arranged leveling roll set at a constant speed. After repeated micro bending corrections, various strip shape errors are gradually corrected to comprehensively improve the flatness and straightness of the steel strip. For raw materials of different materials and thicknesses commonly used on the production line, such as hot-rolled steel strips and cold-rolled steel strips, the equipment can accurately adjust the roll gap and pressing amount through the hydraulic system and adaptively change the leveling force to meet the processing requirements of raw materials for spiral welded pipes of various specifications. Meanwhile, the machine is equipped with a full-line synchronous control system, which can adjust speed in linkage with the whole spiral welded pipe production line. It ensures that the feeding rhythm of the steel strip is highly synchronized with the forming and welding procedures of the spiral welded pipe machine, effectively preventing steel strip pulling, stacking, deviation and uneven tension, and guaranteeing continuous and stable operation of the production line.

             According to different production demands of spiral welded pipe production lines, levelers from Taiyuan Jintong Heavy Industry are divided into small and medium-sized semi-automatic models and large fully automatic heavy-duty models, fully covering production scenarios of spiral welded pipes of all specifications. Small and medium-sized semi-automatic levelers feature simple structure, convenient operation and flexible adjustment, suitable for mass production of conventional spiral welded pipe machines with small and medium calibers. Large fully automatic heavy-duty levelers are specially designed for large-diameter thick-wall spiral welded pipe production lines. They are equipped with automatic strip shape detection, intelligent pressing amount adjustment, automatic shutdown protection against overload and other automatic functions. They can efficiently process wide, thick and high-strength steel strips and are widely used in the production of high-quality spiral welded pipes for oil & gas transmission pipelines, municipal water supply and drainage pipelines and engineering pile pipes.

            In the technological process of the complete spiral welded pipe production line, the leveler undertakes the key tasks of shaping, stabilizing shape and releasing stress for steel strips. It is a core pre-process to guarantee precise forming and regular welds of the spiral welded pipe machine. The steel strip processed by this leveler has flat surface, uniform stress and stable feeding. It eliminates common quality defects in traditional production such as excessive pipe ovality, weld misalignment, pipe wrinkles and overall pipe bending from the source, greatly reducing product reject rate and rework cost. Compared with ordinary simple straightening equipment, the leveler of Taiyuan Jintong Heavy Industry has higher leveling accuracy, more stable operation and better wear resistance and durability, and can fully adapt to 24-hour non-stop continuous industrial production.

            In summary, the leveler of Taiyuan Jintong Heavy Industry is special precision supporting equipment adapted for spiral welded pipe production lines. With solid and reliable structural design, accurate intelligent adjustment system and stable linkage operation capability, it perfectly meets the leveling process requirements of various steel strips. It provides solid process guarantee for the spiral welded pipe machine to realize high-precision forming, stable welding and standardized output of high-quality spiral welded pipes, and serves as an indispensable core key equipment in modern automatic spiral welded pipe production lines.