Infusion bag opening pipe welding preheating device

The utility model discloses an infusion bag opening pipe welding preheating device, and belongs to the technical field of infusion bag production. The welding fixture comprises a U-shaped support frame, a lower welding positioning assembly and an upper welding positioning assembly, the lower welding positioning assembly is installed on a lower bottom plate on the inner side of the U-shaped supporting frame through a lower air cylinder, the upper welding positioning assembly is installed on an upper bottom plate on the inner side of the U-shaped supporting frame through an upper air cylinder, and the upper welding positioning assembly and the lower welding positioning assembly are oppositely arranged. In order to solve the problem that in the prior art, an opening pipe is directly placed inan infusion bag and then welded, the utility model provides the welding preheating device for the opening pipe of the infusion bag, so that the opening pipe is preheated before being welded with theinfusion bag, is primarily