A drive wheel (1) is a rotor device with larger inertia and can rotate on a shaft (5); when a piston rod of a cylinder (3) is pushed, the drive wheel (1) carries out unidirectional rotation under the action of a ratchet system (2); when retracting, the piston rod of the cylinder (3) slides at the ratchet system (2), and an air distribution system (4) continuously provides a compressed gas for the cylinder according to the requirement, thereby converting the reciprocating one-way work application of the cylinder into the continuous, stable and efficient rotation of the drive wheel with the inertia to externally rotate and apply work.