# US 2013/0239642 A1 · Production line of large diameter longitudinal welded pipe

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- Number: US 2013/0239642 A1
- Document ID: US20130239642A1
- Status: Published application
- Kind: A1
- Application number: 13/989,228
- Filed: 2011-03-23
- Published: 2013-09-19
- Earliest claimed: 2010-11-30
- Assignees: Dalian Sage Group Co., Ltd.
- Inventors: Li Ma; Guohong Gao; Zhaokui Lang
- Web page: https://patentgrep.com/patent/US20130239642A1

## CPC

- B21D 21/00: Combined processes according to methods covered by groups B21D1/00 - B21D19/00
- B21C 37/08: Making tubes with welded or soldered seams {(with helically arranged seams B21C37/122)}
- B21D: WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL (working or processing of wire B21F)
- B21C: MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL

## Abstract

A production line of large diameter longitudinal welded pipe 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 rigid rolling machine (15), a cut-to-length cutting machine (16) and a discharging rack (17). The production line in the present invention has the advantages including high production efficiency, stable product quality, low manufacturing cost, as well as reliable and convenient operation.

## Claims

### Claim 1

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.

### Claim 2 (depends on 1)

The production line of large diameter longitudinal welded pipe according to claim 1, wherein the lifting table (9) is a height adjustable lifting table driven by a screw lifter.

### Claim 3 (depends on 1)

The production line of large diameter longitudinal welded pipe according to claim 1, wherein the steel pipe forming machine (10) sequentially includes an edge hollow-bending device (18), a cage roll forming machine (19) and a plate type rigid rolling machine (20).

### Claim 4 (depends on 1)

The production line of large diameter longitudinal welded pipe according to claim 1, wherein the welding device (11) sequentially includes a welding machine (21), an ironing machine (22) and a weld flaw detector (23).

### Claim 5 (depends on 1)

The production line of large diameter longitudinal welded pipe according to claim 1, wherein the pulling device (12) includes a motor and a reducing transmission mechanism.

### Claim 6 (depends on 1)

The production line of large diameter longitudinal welded pipe according to claim 1, wherein the cooling device (14) sequentially includes an air cooling roll table (24) and a water cooling roll table (25).