Self-centering clamping mechanism of machining center spindle

The self-centering clamping mechanism of the machining center spindle comprises a clamp base, a top plate parallel to the clamp base is arranged above the clamp base in a clearance mode, a pushing assembly is arranged on the top plate, and the pushing assembly vertically penetrates through the top plate. The self-centering clamping assemblies are symmetrically distributed on the two sides of the top plate, the upper limit of the self-centering clamping assemblies penetrates through the top plate, and the top ends of the self-centering clamping assemblies are fixed to the top of the pushing assembly; the pushing assembly comprises clamping pull rods symmetrically distributed on the two sides of the top plate, the clamping pull rods vertically penetrate through the top plate, clamping pressing plates are installed on the tops of the clamping pull rods, clamping push plates are fixedly arranged at the bottoms of the clamping pull rods, the clamping push plates are parallel to the clamp base, and a controller fix