Roll welding machine, drainage pipe cage welding machine, concrete pipe steel framework welding machine, for drainage pipe making. This roll welding machine is special for welding the reinforcement cage framework used in concrete drainage pipes. 1) The diameter is varied online automatically, controlled by PLC. 2) The welded cage framework can be for flat joint, tongued & grooved joint, bell & spigot joint concrete pipes. 3) Max. Length: 4m 4) Diameter range: 300-1200mm, 1200-3000mm (different range, different machine) 5) Hoop bar diameter: 4-8mm 6) Production speed: 4-15 minutes per piece 7) In full stroke, the diameter can be varied automatically and shifted very quickly 8) Vertical bars are clamped pneumatically, not manually load & unload the framework 9) Special designed synchronizer to ensure no twist on the formed framework 10) Auto alarm for faults and mis-operation 11) Imported PLC, inverter, encoder and touch screen
