Device for delivering gas in pipeline

A device for delivering gas in a pipeline comprises four fixing plates, two seal rubber pads, two plug plates, an exhaust plate and a gas inlet pipe, wherein every two of the four fixing plates are respectively located at two ends of the device to form gas delivery area in the pipeline, gas inlets are respectively formed in two fixing plates located at one end, a traction ring is arranged on the outer side plate faces of the two fixing plates located outside in the two fixing plates at two ends of the device respectively, the traction rings are connected with one end of a pull rope so as to enable the device for delivering gas in the pipeline to be taken in or out of the pipeline, and the other end of the pull rope serves as a manual traction end. The two seal rubber pads are respectively inlayed in the middles of the two fixing plates at the same end of the device, the two plug plates are located at the center position of the device and are respectively connected with the fixing plates separately arranged on the inner sides of two ends of the device through a spring rod, the exhaust plate is arranged between the two plug plates, and an exhaust hole is formed in the face of the exhaust plate. The gas inlet pipe is connected with the gas inlets of the fixing plates through nuts for gas delivery towards the inside of the pipeline. Argon is quickly injected into a pipeline weld joint, gas delivery towards the back of the weld joint is facilitated, and welding quality is ensured.