Clamping device of butt welding of straight tube and return bend

The utility model discloses a clamping device of butt welding of straight tube and return bend, including the main tank body, in the inner chamber of the main tank body from the top down in proper order the level be provided with horizontal guide bar group and revolve the lead screw about with, be provided with first vertical splint and the vertical splint of second in the inner chamber of the main tank body side by side, the bottom of first vertical splint is passed through the first lantern ring and is controlled lead screw swing joint soon, the bottom of the vertical splint of second pass through the second lantern ring with control and revolve lead screw swing joint, first vertical splint through linear bearing group with the horizontal swing joint of guide bar group, the vertical splint of second through the 2nd linear bearing group with the horizontal swing joint of guide bar group, the inboard of first vertical splint is provided with a V type chuck, the inboard of the vertical splint of second is prov