Supporting and positioning device for flange welding machine tool

The supporting and positioning device for the flange welding machine tool comprises a supporting plate, a first circular groove is formed in the middle of the upper end of the supporting plate, a transmission motor is fixedly connected to the middle of the lower end of the supporting plate, a transmission rod is fixedly connected to a rotating shaft at the upper end of the transmission motor, andthe lower portion of the transmission rod is inserted into the middle of the supporting plate through a bearing. A connecting column is fixedly connected to the middle of the first circular groove, asecond circular groove is formed in the lower end of the connecting column, the upper end of a transmission rod is inserted into the middle of the upper end of the second circular groove through a bearing, an inserting groove is formed in the outer side of the second circular groove, and an extrusion rod is movably inserted into the lower portion of the inner side of the inserting groove; and a limiting stop block is fixed