Pneumatic control switch mechanism for controlling start and stop of reciprocating file

The utility model discloses a pneumatic control switch mechanism for controlling the start and stop of a reciprocating file, which comprises a shell and a piston, the interior of the shell is hollow to form a cavity, and the shell is provided with a first gas circuit, a second gas circuit and a third gas circuit which are communicated with the cavity; the piston is arranged in the cavity, the cavity is divided by the piston to form a first space and a second space, an annular groove is formed in the piston, and the groove is operably right opposite to and communicated with the first air channel. The pneumatic control switch mechanism is adopted to make up the structural defects of the file applied to the field of automation industry, and when a driving gas circuit of the file is long enough, the starting stability of the file can still be guaranteed. The electromagnetic valve is light and simple in overall structure, can be integrated with a pneumatic reciprocating file to be installed on a gripper of a robot