Working Principal¡êo HGZ series Wire Cage welding machine is one of the most necessary equipment to produce reinforced concrete pipes. There is pushing style, another is the Pulling. It makes up of four systems: The Main plate; Pushing Plate; Diameter changing; and Cooper welder, they are working, driven by the separate motor. The Variable Frequency Ratio speed control system will promise the spiral pitch, angel of bell joint at regulated. Capacity: 300-3600mm, length 1-4 meter. Features: 1. Automatic PLC control, Man-machine interface, Touch screen. 2. Variable Frequency Speed control and inverter; 3. Pneumatic clamping system, Gear wheel chain on the main plate; 4. Transformer and electrode water cooling system. Capacity: 300-3600mm, length 1-4 meter.