The production equipment for spiral welded pipes typically consists of an uncoiler, a leveler, a shearer, a disc shear, a feeder, guide plates, a former, internal and external welding machines, a plasma cutting machine, and other components.
Uncoiler: During operation, the steel strip is placed on the support rollers, which rotate to drive the strip's rotation. The cone-head cylinder clamps the strip to stabilize it, and the shovel head opens the strip's head, thereby achieving the uncoiling process.
Leveler: It feeds the steel strip opened by the uncoiler forward and flattens the steel plate. The pinch roll and leveling roll are driven by a motor-powered gearbox and connected through a universal joint to achieve fully active leveling. The leveling rolls are arranged with four above and three below. To enhance leveling capacity, support rolls are installed both above and below the leveling rolls. The drive motor is equipped with a clutch, which opens when the steel strip is fed to the feeder, enabling passive leveling.
Shearer: The shearer is primarily used to cut the head and tail of the steel strip. During continuous production, the head and tail of the steel strip are often unsuitable for direct welding into spiral welded pipes due to various reasons (e.g., non-standard dimensions, poor surface quality). Therefore, the shearer accurately removes these defective parts to ensure smooth subsequent welding processes.
Disc shear: It continuously shears the steel strip using the shearing force of two circular blades positioned above and below.
Feeder: In the production of spiral seam double-sided submerged arc welded pipes, the feeder provides the driving force for the entire unit. Under the action of the feeder, the entire process of steel strip from uncoiling to forming is gradually achieved.
Guide plates: The primary function of the guide plates is to stabilize and guide. Through their design structure, the guide plates ensure that the steel strip maintains a stable trajectory during transportation, preventing deviation or fluctuation during advancement.
Former: The former's main function is to roll the steel strip into a spiral-shaped pipe blank. This is the first and most crucial step in spiral welded pipe production. The former gradually winds and presses the steel strip into a spiral-shaped pipe blank through its specific structure and working principle.
Internal and external welding machines: The internal welding machine's primary function is to perform double-sided welding on the spiral seam of the pipe blank formed by spiral curling at room temperature.
Plasma cutting machine: Characterized by high speed and efficiency, the plasma cutting machine is used in spiral welded pipe production lines to cut steel pipes of a certain length (e.g., 8-12 meters) from the continuous production line. Plasma cutting can quickly complete this task, ensuring the continuity and efficiency of the production line.
