Mandrel clamping and fixing device

The utility model discloses a mandrel clamping and fixing device, the mandrel clamping and fixing device is used for clamping and fixing a mandrel piece, the mandrel clamping and fixing device comprises a base plate, a mounting seat is fixed on the base plate and extends along the height direction of the base plate, a V-shaped groove is arranged on the side wall surface of the mounting seat, a plurality of clamping blocks are arranged in the V-shaped groove at intervals, and the clamping blocks are fixed on the base plate. The abutting piece is connected to the installation base and can move towards one side of the installation base. According to the clamping device, the core shaft piece is located between the mounting base and the abutting piece, the abutting piece drives the core shaft piece to move towards one side of the mounting base, and when the core shaft piece abuts against the multiple clamping blocks, the multiple clamping blocks rotate relative to the mounting base and are attached to and abut aga