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The downpipe machine and elbow machine use color steel plates as raw materials to make closed color steel downpipes after cold bending and automatic locking, and make downpipe elbows with different matching angles after bending. The downpipe machine is composed of uncoiling system, feeding guide system, roll forming system, shearing system, finished product support, hydraulic system and automatic control system. The matching elbow forming machine is suitable for bending and shrinking of the corresponding color steel downpipe. It is produced automatically by mechanical control, and the bending angle can be adjusted manually. The products produced by this equipment are widely used in steel structure buildings, villas and other sewer