Production line of large diameter longitudinal welded pipe

A production line of large diameter longitudinal welded pipe, which is disposed according to a technological process of producing a large diameter longitudinal welded pipe, wherein the production line of large diameter longitudinal welded pipe mainly comprises a material storage table (1), a charging trolley (2), an uncoiler (3), a leveler (4), a shearing and butt welding machine (5), a movable sleeve (6), an edge milling machine (7), a steel plate flaw detector (8), a lifting table (9), a steel pipe forming machine (10), a welding device (11), a pulling device (12), a heat treatment device (13), a cooling device (14), a sizing and plate type rigid rolling machine (15), a cut-to-length cutting machine (16) and a discharging rack (17);

• a plurality of work pieces in strip coil shape stored on the material storage table (1) are delivered by the charging trolley (2) to the uncoiler (3);
• the work pieces, which have been uncoiled by the uncoiler (3) into strip shape, are delivered into the leveler (4) by a pinch mechanism of the leveler (4) for leveling;
• the front and rear leveled work pieces in strip shape are welded by the shearing and butt welding machine (5) into an integrated slab-shaped work piece for continuous production;
• subsequently, the slab-shaped work piece is wound on the movable sleeve (6) through a pinch mechanism of the movable sleeve (6) and is delivered into the edge milling machine (7) through an outlet of the movable sleeve (6);
• the edge milling machine (7) carries out edge milling and welding groove milling according to a circumference of the work piece, namely a required slab width, and the steel plate flaw detector (8) detects the existence of any flaws;
• the qualified slab-shaped work piece after the flaw detecting by the steel plate flaw detector (8) is delivered to the steel pipe forming machine (10) through the lifting table (9), then a steel pipe shaped work piece, which is formed by the steel pipe forming machine, is delivered to the welding device (11) for longitudinal welding, ironing and weld flaw detecting;
• the steel pipe shaped work piece is driven to move forward by the pulling device (12) which is disposed in a machine set after the welding device (11) in the production line, and a qualified welded-pipe shaped work piece after the weld flaw detecting is sequentially delivered into the heat treatment device (13) and the cooling device (14);
• the cooled welded-pipe shaped work piece is delivered into the sizing and plate type rigid rolling machine (15) for sizing in accordance with product standards and requirements, and a qualified work piece in finished product shape after the sizing is delivered into the cut-to-length cutting machine (16) to be cut according to a length required by a user, and is further delivered to the discharging rack (17) for storage and future use.