| 摘要 |
PURPOSE: A pipe inside purging apparatus is provided to maintain the correct posture by expanding or contracting the airbags uniformly. CONSTITUTION: A pipe inside purging apparatus comprises left and right bodies(10A,10B), left and right airbags(20A,20B), air supply and exhaust parts(30), gas supply and exhaust parts(40,50), a controller, and one or more left and right guide rollers(80). The left and right airbags are expanded or contracted to open both ends of a welding pipe. The air supply and exhaust parts supply and discharge air to the left and right airbags. The gas supply and exhaust parts supply and discharge to the pipe inside to purging gas through gas supply and exhaust ports. The controller controls the amounts of air supply/exhaust and gas supply/exhaust. The left and right guide rollers move inside the welding pipe. The left airbag and the right airbag are connected by umbrella rib links. |
