Triboelectric position sensing device for air cylinder, position monitoring system and air cylinder

The invention discloses a triboelectric position sensing device for an air cylinder. The triboelectric position sensing device comprises a pneumatic assembly, a rotor assembly and a stator assembly. The pneumatic assembly comprises a machine body and a magnetic piston, and the magnetic piston is arranged in the machine body and can reciprocate. The mover assembly comprises a mover electrode group and a friction film arranged on the mover electrode group, and the mover electrode group can move along with the piston; the mover electrode group comprises a plurality of mover electrodes which are arranged at intervals. The stator assembly comprises a stator electrode group arranged on the machine body, and the stator electrode group is in contact with the friction film; the stator electrode group comprises a plurality of first stator electrodes and second stator electrodes, and the first stator electrodes and the second stator electrodes are separated from each other and are alternately arranged; when the magnetic