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The back swing spiral welded pipe mill is to open and level the steel coil through the mill equipment, and then feed it into the forming machine at some angles.
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Introduction
The back swing spiral welded pipe mill is to open and level the steel coil through the mill equipment, and then feed it into the forming machine at some angles. By using the principle of three-roller winding machine and some angles, a continuous round pipe is formed, and the continuous spiral weld is welded by submerged arc welding machine. Uncoiling, uncoiling & levelling and shearing butt welding of steel coils are all carried out on reciprocating fly welding vehicles. When butt welding of steel coils is carried out, the flying welding machine keeps the same speed as the main machine, which continuously produces without stopping. When butt welding is completed, the flying welding machine quickly retreats to the initial position and waits for the next steel coil. The continuous production mode has the advantages of high production efficiency, good product quality and less repair welded pipes.
According to the different applications of products, the back swing spiral welded pipe mill is divided into API standard model and national standard model. API standard model is used to produce oil and natural gas (long-distance) transmission pipes, which have very high requirements on steel pipe materials and quality, and also have very high requirements on mill equipment and inspection equipment. The national standard models are used for short-distance natural gas transportation, water pipes, urban pipe network construction, structural pipes and pillar-beating pipes. The material and quality requirements of steel are also high, which is second only to API standard.
Model
| S/N | Model | Spec. (mm) | Plate Width (mm) | Plate Thickness (mm) | Installed Capacity (kW) | Land Area (m2) |
| 1 | HMHL×-820 | Φ219-Φ820 | 350-1300 | 3-14 | 500 | 30×400 |
| 2 | HMHL×-1020 | Φ273-Φ1020 | 350-1300 | 3-16 | 800 | 30×400 |
| 3 | HMHL×-1420 | Φ325-Φ1420 | 500-1600 | 3-18 | 1000 | 30×400 |
| 4 | HMHL×-1620 | Φ426-Φ1620 | 500-1600 | 4-25.4 | 1500 | 30×400 |
| 5 | HMHL×-1820 | Φ508-Φ1820 | 500-2000 | 4-25.4 | 1500 | 30×400 |
| 6 | HMHL×-2020 | Φ508-Φ2020 | 500-2000 | 4-25.4 | 1500 | 30×400 |
| 7 | HMHL×-2400 | Φ508-Φ2400 | 500-2000 | 4-25.4 | 1800 | 30×400 |
| 8 | HMHL×-3000 | Φ610-Φ3000 | 500-2000 | 4-25.4 | 1800 | 30×400 |
| 9 | HMHL×-3500 | Φ720-Φ3500 | 600-2000 | 4-25.4 | 2000 | 30×400 |
Technology Flow
Coiling-Uncoiling-levelling-Shearing butt welding-Edge milling machine-Feeder-Flying welding machine-Delivery machine-Pre-bending and guide plate-Forming-Internal welding-External welding-Tracking cutting-Pipe truck transportation-Internal and external weld repair-Pipe end expansion-X-ray inspection-Hydrostatic test-Flat chamfering-Ultrasonic inspection-Pipe end filming-Weighing, measuring length and spraying labels-Finished product collection.
