Clamping apparatus for cutting tool

A clamping apparatus comprising:

• a clamping member, a cylinder assembly and a transmission assembly assembled in the cylinder assembly, wherein the cylinder assembly comprises a cylinder, a sealing head positioned at one end of the cylinder, and a limiting member positioned at the other end of the cylinder;
• the sealing head defines an air channel communicated with the cylinder, the limiting member comprises a limiting portion connected with the inner of the cylinder which including an inner surface having a frustoconical shape;
• the transmission assembly includes a piston shaft, a piston sleeved on one end of the piston shaft, and an elastic member sleeved on the piston shaft;
• the piston and the elastic member are both received in the cylinder;
• one end of the elastic member resists against the piston, the other end of the elastic member resists against the limiting member, and one end of the piston shaft away from the piston is connected to the clamping member;
• the clamping member is received in the liming member, and includes a clamping portion connected with one end of the piston shaft, the clamping portion is received in the limiting portion and has a shape matched with the frustoconical shaped inner surface of the limiting portion;
• and
• the clamping portion defines a clamping hole in the middle portion thereof.