Automatic assembling machine for transmission assembly of insulin pen and assembling method of automatic assembling machine

The invention discloses an automatic assembling machine for a transmission assembly of an insulin pen and an assembling method thereof. According to the technical scheme, the automatic assembling machine is characterized by comprising a machine table; a first device for mounting a screw rod at a first position, a second device for mounting a piston at the top end of the screw rod to form a first assembly, a third device for mounting a positioner at a second position, and a fourth device for grabbing the first assembly at the first position to be assembled with the positioner are arranged on the machine table along the outer side of the turntable anticlockwise; the fifth device is used for placing fixed retaining teeth at the third position, the sixth device is used for assembling a transmission rod and the fixed retaining teeth to form a third assembly, the seventh device is used for assembling movable retaining teeth and the third assembly to form a fourth assembly, and the eighth device is used for assembli