Tool assembly, tool rotating mechanism and automatic shaver head assembling device

The utility model provides a tool assembly, a tool rotating mechanism and an automatic shaver head assembling device, the tool assembly comprises a base, an elastic piece and two swing arms, and a containing groove is formed in the base; the two swing arms are arranged on the two sides of the base respectively, the middles of the swing arms are hinged to the base, the upper portions of the swing arms are provided with stopping parts, the stopping parts extend into the containing groove and protrude out of the groove wall of the containing groove, a clamping opening is formed between the stopping parts and the groove bottom of the containing groove, the lower portions of the swing arms extend to the position below the base, and the swing arms can rotate around the hinged positions of the swing arms. Further, the clamping opening is controlled to be opened; the elastic piece elastically abuts against the lower portions of the two swing arms, so that the clamping opening is in a normally-closed state. The tool r