Lower welding electrode mechanism of point welding machine

The utility model discloses a lower welding electrode mechanism of a point welding machine and relates to the field of point welding equipment. The lower welding electrode mechanism of the point welding machine comprises a rotatable turnplate, wherein a capsule base is arranged on the circumferential edge of the upper surface of the turnplate, the capsule base is fixed on the turnplate through a bolt, a base groove is formed in the turnplate which is located below the capsule base, a through hole is formed in the center of the bottom of the base groove, the upper portion of a lower welding electrode is clamped in the base groove, the lower portion of the lower welding electrode protrudes out from the through hole in the bottom of the base groove, a spring II is arranged on the periphery of the lower welding electrode in a sleeved mode and is clamped between the bottom of the turnplate and a spring seat on the lower portion of the lower welding electrode, and an opening pad which is embedded in the periphery o